Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * message.c - synchronous message handling |
| 3 | */ |
| 4 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | #include <linux/pci.h> /* for scatterlist macros */ |
| 6 | #include <linux/usb.h> |
| 7 | #include <linux/module.h> |
| 8 | #include <linux/slab.h> |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/mm.h> |
| 11 | #include <linux/timer.h> |
| 12 | #include <linux/ctype.h> |
Clemens Ladisch | a853a3d | 2009-04-24 10:12:18 +0200 | [diff] [blame] | 13 | #include <linux/nls.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/device.h> |
Ralf Baechle | 1176360 | 2007-10-23 20:42:11 +0200 | [diff] [blame] | 15 | #include <linux/scatterlist.h> |
Oliver Neukum | 7ceec1f | 2007-01-26 14:26:21 +0100 | [diff] [blame] | 16 | #include <linux/usb/quirks.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <asm/byteorder.h> |
| 18 | |
| 19 | #include "hcd.h" /* for usbcore internals */ |
| 20 | #include "usb.h" |
| 21 | |
Alan Stern | df71896 | 2008-12-19 10:27:56 -0500 | [diff] [blame] | 22 | static void cancel_async_set_config(struct usb_device *udev); |
| 23 | |
Alan Stern | 67f5dde | 2007-07-24 18:23:23 -0400 | [diff] [blame] | 24 | struct api_context { |
| 25 | struct completion done; |
| 26 | int status; |
| 27 | }; |
| 28 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 29 | static void usb_api_blocking_completion(struct urb *urb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | { |
Alan Stern | 67f5dde | 2007-07-24 18:23:23 -0400 | [diff] [blame] | 31 | struct api_context *ctx = urb->context; |
| 32 | |
| 33 | ctx->status = urb->status; |
| 34 | complete(&ctx->done); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | } |
| 36 | |
| 37 | |
Franck Bui-Huu | ecdc0a5 | 2006-07-12 10:09:41 +0200 | [diff] [blame] | 38 | /* |
| 39 | * Starts urb and waits for completion or timeout. Note that this call |
| 40 | * is NOT interruptible. Many device driver i/o requests should be |
| 41 | * interruptible and therefore these drivers should implement their |
| 42 | * own interruptible routines. |
| 43 | */ |
| 44 | static int usb_start_wait_urb(struct urb *urb, int timeout, int *actual_length) |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 45 | { |
Alan Stern | 67f5dde | 2007-07-24 18:23:23 -0400 | [diff] [blame] | 46 | struct api_context ctx; |
Franck Bui-Huu | ecdc0a5 | 2006-07-12 10:09:41 +0200 | [diff] [blame] | 47 | unsigned long expire; |
Greg Kroah-Hartman | 3fc3e82 | 2007-07-18 10:58:02 -0700 | [diff] [blame] | 48 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
Alan Stern | 67f5dde | 2007-07-24 18:23:23 -0400 | [diff] [blame] | 50 | init_completion(&ctx.done); |
| 51 | urb->context = &ctx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | urb->actual_length = 0; |
Greg Kroah-Hartman | 3fc3e82 | 2007-07-18 10:58:02 -0700 | [diff] [blame] | 53 | retval = usb_submit_urb(urb, GFP_NOIO); |
| 54 | if (unlikely(retval)) |
Franck Bui-Huu | ecdc0a5 | 2006-07-12 10:09:41 +0200 | [diff] [blame] | 55 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
Franck Bui-Huu | ecdc0a5 | 2006-07-12 10:09:41 +0200 | [diff] [blame] | 57 | expire = timeout ? msecs_to_jiffies(timeout) : MAX_SCHEDULE_TIMEOUT; |
Alan Stern | 67f5dde | 2007-07-24 18:23:23 -0400 | [diff] [blame] | 58 | if (!wait_for_completion_timeout(&ctx.done, expire)) { |
| 59 | usb_kill_urb(urb); |
| 60 | retval = (ctx.status == -ENOENT ? -ETIMEDOUT : ctx.status); |
Franck Bui-Huu | ecdc0a5 | 2006-07-12 10:09:41 +0200 | [diff] [blame] | 61 | |
| 62 | dev_dbg(&urb->dev->dev, |
Roel Kluin | 71d2718 | 2009-03-13 12:19:18 +0100 | [diff] [blame] | 63 | "%s timed out on ep%d%s len=%u/%u\n", |
Franck Bui-Huu | ecdc0a5 | 2006-07-12 10:09:41 +0200 | [diff] [blame] | 64 | current->comm, |
Alan Stern | 5e60a16 | 2007-07-30 17:07:21 -0400 | [diff] [blame] | 65 | usb_endpoint_num(&urb->ep->desc), |
| 66 | usb_urb_dir_in(urb) ? "in" : "out", |
Franck Bui-Huu | ecdc0a5 | 2006-07-12 10:09:41 +0200 | [diff] [blame] | 67 | urb->actual_length, |
| 68 | urb->transfer_buffer_length); |
Franck Bui-Huu | ecdc0a5 | 2006-07-12 10:09:41 +0200 | [diff] [blame] | 69 | } else |
Alan Stern | 67f5dde | 2007-07-24 18:23:23 -0400 | [diff] [blame] | 70 | retval = ctx.status; |
Franck Bui-Huu | ecdc0a5 | 2006-07-12 10:09:41 +0200 | [diff] [blame] | 71 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | if (actual_length) |
| 73 | *actual_length = urb->actual_length; |
Franck Bui-Huu | ecdc0a5 | 2006-07-12 10:09:41 +0200 | [diff] [blame] | 74 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | usb_free_urb(urb); |
Greg Kroah-Hartman | 3fc3e82 | 2007-07-18 10:58:02 -0700 | [diff] [blame] | 76 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | } |
| 78 | |
| 79 | /*-------------------------------------------------------------------*/ |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 80 | /* returns status (negative) or length (positive) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | static int usb_internal_control_msg(struct usb_device *usb_dev, |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 82 | unsigned int pipe, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | struct usb_ctrlrequest *cmd, |
| 84 | void *data, int len, int timeout) |
| 85 | { |
| 86 | struct urb *urb; |
| 87 | int retv; |
| 88 | int length; |
| 89 | |
| 90 | urb = usb_alloc_urb(0, GFP_NOIO); |
| 91 | if (!urb) |
| 92 | return -ENOMEM; |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 93 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | usb_fill_control_urb(urb, usb_dev, pipe, (unsigned char *)cmd, data, |
| 95 | len, usb_api_blocking_completion, NULL); |
| 96 | |
| 97 | retv = usb_start_wait_urb(urb, timeout, &length); |
| 98 | if (retv < 0) |
| 99 | return retv; |
| 100 | else |
| 101 | return length; |
| 102 | } |
| 103 | |
| 104 | /** |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 105 | * usb_control_msg - Builds a control urb, sends it off and waits for completion |
| 106 | * @dev: pointer to the usb device to send the message to |
| 107 | * @pipe: endpoint "pipe" to send the message to |
| 108 | * @request: USB message request value |
| 109 | * @requesttype: USB message request type value |
| 110 | * @value: USB message value |
| 111 | * @index: USB message index value |
| 112 | * @data: pointer to the data to send |
| 113 | * @size: length in bytes of the data to send |
| 114 | * @timeout: time in msecs to wait for the message to complete before timing |
| 115 | * out (if 0 the wait is forever) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | * |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 117 | * Context: !in_interrupt () |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | * |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 119 | * This function sends a simple control message to a specified endpoint and |
| 120 | * waits for the message to complete, or timeout. |
| 121 | * |
| 122 | * If successful, it returns the number of bytes transferred, otherwise a |
| 123 | * negative error number. |
| 124 | * |
| 125 | * Don't use this function from within an interrupt context, like a bottom half |
| 126 | * handler. If you need an asynchronous message, or need to send a message |
| 127 | * from within interrupt context, use usb_submit_urb(). |
| 128 | * If a thread in your driver uses this call, make sure your disconnect() |
| 129 | * method can wait for it to complete. Since you don't have a handle on the |
| 130 | * URB used, you can't cancel the request. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | */ |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 132 | int usb_control_msg(struct usb_device *dev, unsigned int pipe, __u8 request, |
| 133 | __u8 requesttype, __u16 value, __u16 index, void *data, |
| 134 | __u16 size, int timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | { |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 136 | struct usb_ctrlrequest *dr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | int ret; |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 138 | |
| 139 | dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | if (!dr) |
| 141 | return -ENOMEM; |
| 142 | |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 143 | dr->bRequestType = requesttype; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | dr->bRequest = request; |
Harvey Harrison | da2bbdc | 2008-10-29 14:25:51 -0700 | [diff] [blame] | 145 | dr->wValue = cpu_to_le16(value); |
| 146 | dr->wIndex = cpu_to_le16(index); |
| 147 | dr->wLength = cpu_to_le16(size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 149 | /* dbg("usb_control_msg"); */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | |
| 151 | ret = usb_internal_control_msg(dev, pipe, dr, data, size, timeout); |
| 152 | |
| 153 | kfree(dr); |
| 154 | |
| 155 | return ret; |
| 156 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 157 | EXPORT_SYMBOL_GPL(usb_control_msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | |
| 159 | /** |
Greg Kroah-Hartman | 782a7a6 | 2006-05-19 13:20:20 -0700 | [diff] [blame] | 160 | * usb_interrupt_msg - Builds an interrupt urb, sends it off and waits for completion |
| 161 | * @usb_dev: pointer to the usb device to send the message to |
| 162 | * @pipe: endpoint "pipe" to send the message to |
| 163 | * @data: pointer to the data to send |
| 164 | * @len: length in bytes of the data to send |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 165 | * @actual_length: pointer to a location to put the actual length transferred |
| 166 | * in bytes |
Greg Kroah-Hartman | 782a7a6 | 2006-05-19 13:20:20 -0700 | [diff] [blame] | 167 | * @timeout: time in msecs to wait for the message to complete before |
| 168 | * timing out (if 0 the wait is forever) |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 169 | * |
Greg Kroah-Hartman | 782a7a6 | 2006-05-19 13:20:20 -0700 | [diff] [blame] | 170 | * Context: !in_interrupt () |
| 171 | * |
| 172 | * This function sends a simple interrupt message to a specified endpoint and |
| 173 | * waits for the message to complete, or timeout. |
| 174 | * |
| 175 | * If successful, it returns 0, otherwise a negative error number. The number |
| 176 | * of actual bytes transferred will be stored in the actual_length paramater. |
| 177 | * |
| 178 | * Don't use this function from within an interrupt context, like a bottom half |
| 179 | * handler. If you need an asynchronous message, or need to send a message |
| 180 | * from within interrupt context, use usb_submit_urb() If a thread in your |
| 181 | * driver uses this call, make sure your disconnect() method can wait for it to |
| 182 | * complete. Since you don't have a handle on the URB used, you can't cancel |
| 183 | * the request. |
| 184 | */ |
| 185 | int usb_interrupt_msg(struct usb_device *usb_dev, unsigned int pipe, |
| 186 | void *data, int len, int *actual_length, int timeout) |
| 187 | { |
| 188 | return usb_bulk_msg(usb_dev, pipe, data, len, actual_length, timeout); |
| 189 | } |
| 190 | EXPORT_SYMBOL_GPL(usb_interrupt_msg); |
| 191 | |
| 192 | /** |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 193 | * usb_bulk_msg - Builds a bulk urb, sends it off and waits for completion |
| 194 | * @usb_dev: pointer to the usb device to send the message to |
| 195 | * @pipe: endpoint "pipe" to send the message to |
| 196 | * @data: pointer to the data to send |
| 197 | * @len: length in bytes of the data to send |
| 198 | * @actual_length: pointer to a location to put the actual length transferred |
| 199 | * in bytes |
| 200 | * @timeout: time in msecs to wait for the message to complete before |
| 201 | * timing out (if 0 the wait is forever) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | * |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 203 | * Context: !in_interrupt () |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | * |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 205 | * This function sends a simple bulk message to a specified endpoint |
| 206 | * and waits for the message to complete, or timeout. |
Alan Stern | d09d36a | 2005-09-26 16:22:45 -0400 | [diff] [blame] | 207 | * |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 208 | * If successful, it returns 0, otherwise a negative error number. The number |
| 209 | * of actual bytes transferred will be stored in the actual_length paramater. |
| 210 | * |
| 211 | * Don't use this function from within an interrupt context, like a bottom half |
| 212 | * handler. If you need an asynchronous message, or need to send a message |
| 213 | * from within interrupt context, use usb_submit_urb() If a thread in your |
| 214 | * driver uses this call, make sure your disconnect() method can wait for it to |
| 215 | * complete. Since you don't have a handle on the URB used, you can't cancel |
| 216 | * the request. |
| 217 | * |
| 218 | * Because there is no usb_interrupt_msg() and no USBDEVFS_INTERRUPT ioctl, |
| 219 | * users are forced to abuse this routine by using it to submit URBs for |
| 220 | * interrupt endpoints. We will take the liberty of creating an interrupt URB |
| 221 | * (with the default interval) if the target is an interrupt endpoint. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | */ |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 223 | int usb_bulk_msg(struct usb_device *usb_dev, unsigned int pipe, |
| 224 | void *data, int len, int *actual_length, int timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | { |
| 226 | struct urb *urb; |
Alan Stern | d09d36a | 2005-09-26 16:22:45 -0400 | [diff] [blame] | 227 | struct usb_host_endpoint *ep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | |
Alan Stern | d09d36a | 2005-09-26 16:22:45 -0400 | [diff] [blame] | 229 | ep = (usb_pipein(pipe) ? usb_dev->ep_in : usb_dev->ep_out) |
| 230 | [usb_pipeendpoint(pipe)]; |
| 231 | if (!ep || len < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | return -EINVAL; |
| 233 | |
Alan Stern | d09d36a | 2005-09-26 16:22:45 -0400 | [diff] [blame] | 234 | urb = usb_alloc_urb(0, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | if (!urb) |
| 236 | return -ENOMEM; |
| 237 | |
Alan Stern | d09d36a | 2005-09-26 16:22:45 -0400 | [diff] [blame] | 238 | if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == |
| 239 | USB_ENDPOINT_XFER_INT) { |
| 240 | pipe = (pipe & ~(3 << 30)) | (PIPE_INTERRUPT << 30); |
| 241 | usb_fill_int_urb(urb, usb_dev, pipe, data, len, |
Alan Stern | 8d062b9 | 2007-04-23 17:30:32 -0400 | [diff] [blame] | 242 | usb_api_blocking_completion, NULL, |
| 243 | ep->desc.bInterval); |
Alan Stern | d09d36a | 2005-09-26 16:22:45 -0400 | [diff] [blame] | 244 | } else |
| 245 | usb_fill_bulk_urb(urb, usb_dev, pipe, data, len, |
| 246 | usb_api_blocking_completion, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | |
| 248 | return usb_start_wait_urb(urb, timeout, actual_length); |
| 249 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 250 | EXPORT_SYMBOL_GPL(usb_bulk_msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | |
| 252 | /*-------------------------------------------------------------------*/ |
| 253 | |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 254 | static void sg_clean(struct usb_sg_request *io) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | { |
| 256 | if (io->urbs) { |
| 257 | while (io->entries--) |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 258 | usb_free_urb(io->urbs [io->entries]); |
| 259 | kfree(io->urbs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | io->urbs = NULL; |
| 261 | } |
| 262 | if (io->dev->dev.dma_mask != NULL) |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 263 | usb_buffer_unmap_sg(io->dev, usb_pipein(io->pipe), |
| 264 | io->sg, io->nents); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | io->dev = NULL; |
| 266 | } |
| 267 | |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 268 | static void sg_complete(struct urb *urb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | { |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 270 | struct usb_sg_request *io = urb->context; |
Greg Kroah-Hartman | 3fc3e82 | 2007-07-18 10:58:02 -0700 | [diff] [blame] | 271 | int status = urb->status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 273 | spin_lock(&io->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | |
| 275 | /* In 2.5 we require hcds' endpoint queues not to progress after fault |
| 276 | * reports, until the completion callback (this!) returns. That lets |
| 277 | * device driver code (like this routine) unlink queued urbs first, |
| 278 | * if it needs to, since the HC won't work on them at all. So it's |
| 279 | * not possible for page N+1 to overwrite page N, and so on. |
| 280 | * |
| 281 | * That's only for "hard" faults; "soft" faults (unlinks) sometimes |
| 282 | * complete before the HCD can get requests away from hardware, |
| 283 | * though never during cleanup after a hard fault. |
| 284 | */ |
| 285 | if (io->status |
| 286 | && (io->status != -ECONNRESET |
Greg Kroah-Hartman | 3fc3e82 | 2007-07-18 10:58:02 -0700 | [diff] [blame] | 287 | || status != -ECONNRESET) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | && urb->actual_length) { |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 289 | dev_err(io->dev->bus->controller, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | "dev %s ep%d%s scatterlist error %d/%d\n", |
| 291 | io->dev->devpath, |
Alan Stern | 5e60a16 | 2007-07-30 17:07:21 -0400 | [diff] [blame] | 292 | usb_endpoint_num(&urb->ep->desc), |
| 293 | usb_urb_dir_in(urb) ? "in" : "out", |
Greg Kroah-Hartman | 3fc3e82 | 2007-07-18 10:58:02 -0700 | [diff] [blame] | 294 | status, io->status); |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 295 | /* BUG (); */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | } |
| 297 | |
Greg Kroah-Hartman | 3fc3e82 | 2007-07-18 10:58:02 -0700 | [diff] [blame] | 298 | if (io->status == 0 && status && status != -ECONNRESET) { |
| 299 | int i, found, retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | |
Greg Kroah-Hartman | 3fc3e82 | 2007-07-18 10:58:02 -0700 | [diff] [blame] | 301 | io->status = status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | |
| 303 | /* the previous urbs, and this one, completed already. |
| 304 | * unlink pending urbs so they won't rx/tx bad data. |
| 305 | * careful: unlink can sometimes be synchronous... |
| 306 | */ |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 307 | spin_unlock(&io->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | for (i = 0, found = 0; i < io->entries; i++) { |
| 309 | if (!io->urbs [i] || !io->urbs [i]->dev) |
| 310 | continue; |
| 311 | if (found) { |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 312 | retval = usb_unlink_urb(io->urbs [i]); |
Greg Kroah-Hartman | 3fc3e82 | 2007-07-18 10:58:02 -0700 | [diff] [blame] | 313 | if (retval != -EINPROGRESS && |
| 314 | retval != -ENODEV && |
| 315 | retval != -EBUSY) |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 316 | dev_err(&io->dev->dev, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | "%s, unlink --> %d\n", |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 318 | __func__, retval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | } else if (urb == io->urbs [i]) |
| 320 | found = 1; |
| 321 | } |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 322 | spin_lock(&io->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | } |
| 324 | urb->dev = NULL; |
| 325 | |
| 326 | /* on the last completion, signal usb_sg_wait() */ |
| 327 | io->bytes += urb->actual_length; |
| 328 | io->count--; |
| 329 | if (!io->count) |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 330 | complete(&io->complete); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 332 | spin_unlock(&io->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | } |
| 334 | |
| 335 | |
| 336 | /** |
| 337 | * usb_sg_init - initializes scatterlist-based bulk/interrupt I/O request |
| 338 | * @io: request block being initialized. until usb_sg_wait() returns, |
| 339 | * treat this as a pointer to an opaque block of memory, |
| 340 | * @dev: the usb device that will send or receive the data |
| 341 | * @pipe: endpoint "pipe" used to transfer the data |
| 342 | * @period: polling rate for interrupt endpoints, in frames or |
| 343 | * (for high speed endpoints) microframes; ignored for bulk |
| 344 | * @sg: scatterlist entries |
| 345 | * @nents: how many entries in the scatterlist |
| 346 | * @length: how many bytes to send from the scatterlist, or zero to |
| 347 | * send every byte identified in the list. |
| 348 | * @mem_flags: SLAB_* flags affecting memory allocations in this call |
| 349 | * |
| 350 | * Returns zero for success, else a negative errno value. This initializes a |
| 351 | * scatter/gather request, allocating resources such as I/O mappings and urb |
| 352 | * memory (except maybe memory used by USB controller drivers). |
| 353 | * |
| 354 | * The request must be issued using usb_sg_wait(), which waits for the I/O to |
| 355 | * complete (or to be canceled) and then cleans up all resources allocated by |
| 356 | * usb_sg_init(). |
| 357 | * |
| 358 | * The request may be canceled with usb_sg_cancel(), either before or after |
| 359 | * usb_sg_wait() is called. |
| 360 | */ |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 361 | int usb_sg_init(struct usb_sg_request *io, struct usb_device *dev, |
| 362 | unsigned pipe, unsigned period, struct scatterlist *sg, |
| 363 | int nents, size_t length, gfp_t mem_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | { |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 365 | int i; |
| 366 | int urb_flags; |
| 367 | int dma; |
Sarah Sharp | e04748e | 2009-04-27 19:59:01 -0700 | [diff] [blame] | 368 | int use_sg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | |
| 370 | if (!io || !dev || !sg |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 371 | || usb_pipecontrol(pipe) |
| 372 | || usb_pipeisoc(pipe) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | || nents <= 0) |
| 374 | return -EINVAL; |
| 375 | |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 376 | spin_lock_init(&io->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | io->dev = dev; |
| 378 | io->pipe = pipe; |
| 379 | io->sg = sg; |
| 380 | io->nents = nents; |
| 381 | |
| 382 | /* not all host controllers use DMA (like the mainstream pci ones); |
| 383 | * they can use PIO (sl811) or be software over another transport. |
| 384 | */ |
| 385 | dma = (dev->dev.dma_mask != NULL); |
| 386 | if (dma) |
Alan Stern | 5e60a16 | 2007-07-30 17:07:21 -0400 | [diff] [blame] | 387 | io->entries = usb_buffer_map_sg(dev, usb_pipein(pipe), |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 388 | sg, nents); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | else |
| 390 | io->entries = nents; |
| 391 | |
| 392 | /* initialize all the urbs we'll use */ |
| 393 | if (io->entries <= 0) |
| 394 | return io->entries; |
| 395 | |
David Vrabel | 4c1bd3d | 2009-08-24 14:44:30 +0100 | [diff] [blame] | 396 | if (dev->bus->sg_tablesize > 0) { |
Sarah Sharp | e04748e | 2009-04-27 19:59:01 -0700 | [diff] [blame] | 397 | io->urbs = kmalloc(sizeof *io->urbs, mem_flags); |
| 398 | use_sg = true; |
| 399 | } else { |
| 400 | io->urbs = kmalloc(io->entries * sizeof *io->urbs, mem_flags); |
| 401 | use_sg = false; |
| 402 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | if (!io->urbs) |
| 404 | goto nomem; |
| 405 | |
Alan Stern | ed1db3a | 2009-10-27 15:26:50 -0400 | [diff] [blame] | 406 | urb_flags = 0; |
Yoshihiro Shimoda | e272252 | 2008-04-21 13:48:22 +0900 | [diff] [blame] | 407 | if (dma) |
| 408 | urb_flags |= URB_NO_TRANSFER_DMA_MAP; |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 409 | if (usb_pipein(pipe)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | urb_flags |= URB_SHORT_NOT_OK; |
| 411 | |
Sarah Sharp | e04748e | 2009-04-27 19:59:01 -0700 | [diff] [blame] | 412 | if (use_sg) { |
| 413 | io->urbs[0] = usb_alloc_urb(0, mem_flags); |
| 414 | if (!io->urbs[0]) { |
| 415 | io->entries = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | goto nomem; |
| 417 | } |
| 418 | |
Sarah Sharp | e04748e | 2009-04-27 19:59:01 -0700 | [diff] [blame] | 419 | io->urbs[0]->dev = NULL; |
| 420 | io->urbs[0]->pipe = pipe; |
| 421 | io->urbs[0]->interval = period; |
| 422 | io->urbs[0]->transfer_flags = urb_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | |
Sarah Sharp | e04748e | 2009-04-27 19:59:01 -0700 | [diff] [blame] | 424 | io->urbs[0]->complete = sg_complete; |
| 425 | io->urbs[0]->context = io; |
| 426 | /* A length of zero means transfer the whole sg list */ |
| 427 | io->urbs[0]->transfer_buffer_length = length; |
| 428 | if (length == 0) { |
| 429 | for_each_sg(sg, sg, io->entries, i) { |
| 430 | io->urbs[0]->transfer_buffer_length += |
| 431 | sg_dma_len(sg); |
| 432 | } |
| 433 | } |
| 434 | io->urbs[0]->sg = io; |
| 435 | io->urbs[0]->num_sgs = io->entries; |
| 436 | io->entries = 1; |
| 437 | } else { |
Alan Stern | ed1db3a | 2009-10-27 15:26:50 -0400 | [diff] [blame] | 438 | urb_flags |= URB_NO_INTERRUPT; |
Sarah Sharp | e04748e | 2009-04-27 19:59:01 -0700 | [diff] [blame] | 439 | for_each_sg(sg, sg, io->entries, i) { |
| 440 | unsigned len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | |
Sarah Sharp | e04748e | 2009-04-27 19:59:01 -0700 | [diff] [blame] | 442 | io->urbs[i] = usb_alloc_urb(0, mem_flags); |
| 443 | if (!io->urbs[i]) { |
| 444 | io->entries = i; |
| 445 | goto nomem; |
| 446 | } |
| 447 | |
| 448 | io->urbs[i]->dev = NULL; |
| 449 | io->urbs[i]->pipe = pipe; |
| 450 | io->urbs[i]->interval = period; |
| 451 | io->urbs[i]->transfer_flags = urb_flags; |
| 452 | |
| 453 | io->urbs[i]->complete = sg_complete; |
| 454 | io->urbs[i]->context = io; |
| 455 | |
| 456 | /* |
Pete Zaitcev | 81bf46f | 2009-06-11 08:40:39 -0600 | [diff] [blame] | 457 | * Some systems need to revert to PIO when DMA is temporarily |
| 458 | * unavailable. For their sakes, both transfer_buffer and |
| 459 | * transfer_dma are set when possible. |
Sarah Sharp | e04748e | 2009-04-27 19:59:01 -0700 | [diff] [blame] | 460 | * |
Pete Zaitcev | 81bf46f | 2009-06-11 08:40:39 -0600 | [diff] [blame] | 461 | * Note that if IOMMU coalescing occurred, we cannot |
| 462 | * trust sg_page anymore, so check if S/G list shrunk. |
Sarah Sharp | e04748e | 2009-04-27 19:59:01 -0700 | [diff] [blame] | 463 | */ |
Pete Zaitcev | 81bf46f | 2009-06-11 08:40:39 -0600 | [diff] [blame] | 464 | if (io->nents == io->entries && !PageHighMem(sg_page(sg))) |
| 465 | io->urbs[i]->transfer_buffer = sg_virt(sg); |
| 466 | else |
| 467 | io->urbs[i]->transfer_buffer = NULL; |
| 468 | |
Sarah Sharp | e04748e | 2009-04-27 19:59:01 -0700 | [diff] [blame] | 469 | if (dma) { |
| 470 | io->urbs[i]->transfer_dma = sg_dma_address(sg); |
| 471 | len = sg_dma_len(sg); |
Sarah Sharp | e04748e | 2009-04-27 19:59:01 -0700 | [diff] [blame] | 472 | } else { |
| 473 | /* hc may use _only_ transfer_buffer */ |
Sarah Sharp | e04748e | 2009-04-27 19:59:01 -0700 | [diff] [blame] | 474 | len = sg->length; |
| 475 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | |
Sarah Sharp | e04748e | 2009-04-27 19:59:01 -0700 | [diff] [blame] | 477 | if (length) { |
| 478 | len = min_t(unsigned, len, length); |
| 479 | length -= len; |
| 480 | if (length == 0) |
| 481 | io->entries = i + 1; |
| 482 | } |
| 483 | io->urbs[i]->transfer_buffer_length = len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | } |
Sarah Sharp | e04748e | 2009-04-27 19:59:01 -0700 | [diff] [blame] | 485 | io->urbs[--i]->transfer_flags &= ~URB_NO_INTERRUPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | |
| 488 | /* transaction state */ |
Alan Stern | 580da34 | 2008-08-05 13:05:17 -0400 | [diff] [blame] | 489 | io->count = io->entries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | io->status = 0; |
| 491 | io->bytes = 0; |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 492 | init_completion(&io->complete); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | return 0; |
| 494 | |
| 495 | nomem: |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 496 | sg_clean(io); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | return -ENOMEM; |
| 498 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 499 | EXPORT_SYMBOL_GPL(usb_sg_init); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | |
| 501 | /** |
| 502 | * usb_sg_wait - synchronously execute scatter/gather request |
| 503 | * @io: request block handle, as initialized with usb_sg_init(). |
| 504 | * some fields become accessible when this call returns. |
| 505 | * Context: !in_interrupt () |
| 506 | * |
| 507 | * This function blocks until the specified I/O operation completes. It |
| 508 | * leverages the grouping of the related I/O requests to get good transfer |
| 509 | * rates, by queueing the requests. At higher speeds, such queuing can |
| 510 | * significantly improve USB throughput. |
| 511 | * |
| 512 | * There are three kinds of completion for this function. |
| 513 | * (1) success, where io->status is zero. The number of io->bytes |
| 514 | * transferred is as requested. |
| 515 | * (2) error, where io->status is a negative errno value. The number |
| 516 | * of io->bytes transferred before the error is usually less |
| 517 | * than requested, and can be nonzero. |
Steven Cole | 093cf72 | 2005-05-03 19:07:24 -0600 | [diff] [blame] | 518 | * (3) cancellation, a type of error with status -ECONNRESET that |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | * is initiated by usb_sg_cancel(). |
| 520 | * |
| 521 | * When this function returns, all memory allocated through usb_sg_init() or |
| 522 | * this call will have been freed. The request block parameter may still be |
| 523 | * passed to usb_sg_cancel(), or it may be freed. It could also be |
| 524 | * reinitialized and then reused. |
| 525 | * |
| 526 | * Data Transfer Rates: |
| 527 | * |
| 528 | * Bulk transfers are valid for full or high speed endpoints. |
| 529 | * The best full speed data rate is 19 packets of 64 bytes each |
| 530 | * per frame, or 1216 bytes per millisecond. |
| 531 | * The best high speed data rate is 13 packets of 512 bytes each |
| 532 | * per microframe, or 52 KBytes per millisecond. |
| 533 | * |
| 534 | * The reason to use interrupt transfers through this API would most likely |
| 535 | * be to reserve high speed bandwidth, where up to 24 KBytes per millisecond |
| 536 | * could be transferred. That capability is less useful for low or full |
| 537 | * speed interrupt endpoints, which allow at most one packet per millisecond, |
| 538 | * of at most 8 or 64 bytes (respectively). |
Sarah Sharp | 79abb1a | 2009-04-27 19:58:26 -0700 | [diff] [blame] | 539 | * |
| 540 | * It is not necessary to call this function to reserve bandwidth for devices |
| 541 | * under an xHCI host controller, as the bandwidth is reserved when the |
| 542 | * configuration or interface alt setting is selected. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | */ |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 544 | void usb_sg_wait(struct usb_sg_request *io) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | { |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 546 | int i; |
| 547 | int entries = io->entries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | |
| 549 | /* queue the urbs. */ |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 550 | spin_lock_irq(&io->lock); |
Alan Stern | 8ccef0d | 2007-06-21 16:26:46 -0400 | [diff] [blame] | 551 | i = 0; |
| 552 | while (i < entries && !io->status) { |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 553 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 555 | io->urbs[i]->dev = io->dev; |
| 556 | retval = usb_submit_urb(io->urbs [i], GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | |
| 558 | /* after we submit, let completions or cancelations fire; |
| 559 | * we handshake using io->status. |
| 560 | */ |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 561 | spin_unlock_irq(&io->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | switch (retval) { |
| 563 | /* maybe we retrying will recover */ |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 564 | case -ENXIO: /* hc didn't queue this one */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | case -EAGAIN: |
| 566 | case -ENOMEM: |
| 567 | io->urbs[i]->dev = NULL; |
| 568 | retval = 0; |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 569 | yield(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | break; |
| 571 | |
| 572 | /* no error? continue immediately. |
| 573 | * |
| 574 | * NOTE: to work better with UHCI (4K I/O buffer may |
| 575 | * need 3K of TDs) it may be good to limit how many |
| 576 | * URBs are queued at once; N milliseconds? |
| 577 | */ |
| 578 | case 0: |
Alan Stern | 8ccef0d | 2007-06-21 16:26:46 -0400 | [diff] [blame] | 579 | ++i; |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 580 | cpu_relax(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | break; |
| 582 | |
| 583 | /* fail any uncompleted urbs */ |
| 584 | default: |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 585 | io->urbs[i]->dev = NULL; |
| 586 | io->urbs[i]->status = retval; |
| 587 | dev_dbg(&io->dev->dev, "%s, submit --> %d\n", |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 588 | __func__, retval); |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 589 | usb_sg_cancel(io); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | } |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 591 | spin_lock_irq(&io->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | if (retval && (io->status == 0 || io->status == -ECONNRESET)) |
| 593 | io->status = retval; |
| 594 | } |
| 595 | io->count -= entries - i; |
| 596 | if (io->count == 0) |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 597 | complete(&io->complete); |
| 598 | spin_unlock_irq(&io->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | |
| 600 | /* OK, yes, this could be packaged as non-blocking. |
| 601 | * So could the submit loop above ... but it's easier to |
| 602 | * solve neither problem than to solve both! |
| 603 | */ |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 604 | wait_for_completion(&io->complete); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 606 | sg_clean(io); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 608 | EXPORT_SYMBOL_GPL(usb_sg_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | |
| 610 | /** |
| 611 | * usb_sg_cancel - stop scatter/gather i/o issued by usb_sg_wait() |
| 612 | * @io: request block, initialized with usb_sg_init() |
| 613 | * |
| 614 | * This stops a request after it has been started by usb_sg_wait(). |
| 615 | * It can also prevents one initialized by usb_sg_init() from starting, |
| 616 | * so that call just frees resources allocated to the request. |
| 617 | */ |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 618 | void usb_sg_cancel(struct usb_sg_request *io) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | { |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 620 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 622 | spin_lock_irqsave(&io->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | |
| 624 | /* shut everything down, if it didn't already */ |
| 625 | if (!io->status) { |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 626 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | |
| 628 | io->status = -ECONNRESET; |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 629 | spin_unlock(&io->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | for (i = 0; i < io->entries; i++) { |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 631 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | |
| 633 | if (!io->urbs [i]->dev) |
| 634 | continue; |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 635 | retval = usb_unlink_urb(io->urbs [i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | if (retval != -EINPROGRESS && retval != -EBUSY) |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 637 | dev_warn(&io->dev->dev, "%s, unlink --> %d\n", |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 638 | __func__, retval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | } |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 640 | spin_lock(&io->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | } |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 642 | spin_unlock_irqrestore(&io->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 644 | EXPORT_SYMBOL_GPL(usb_sg_cancel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | |
| 646 | /*-------------------------------------------------------------------*/ |
| 647 | |
| 648 | /** |
| 649 | * usb_get_descriptor - issues a generic GET_DESCRIPTOR request |
| 650 | * @dev: the device whose descriptor is being retrieved |
| 651 | * @type: the descriptor type (USB_DT_*) |
| 652 | * @index: the number of the descriptor |
| 653 | * @buf: where to put the descriptor |
| 654 | * @size: how big is "buf"? |
| 655 | * Context: !in_interrupt () |
| 656 | * |
| 657 | * Gets a USB descriptor. Convenience functions exist to simplify |
| 658 | * getting some types of descriptors. Use |
| 659 | * usb_get_string() or usb_string() for USB_DT_STRING. |
| 660 | * Device (USB_DT_DEVICE) and configuration descriptors (USB_DT_CONFIG) |
| 661 | * are part of the device structure. |
| 662 | * In addition to a number of USB-standard descriptors, some |
| 663 | * devices also use class-specific or vendor-specific descriptors. |
| 664 | * |
| 665 | * This call is synchronous, and may not be used in an interrupt context. |
| 666 | * |
| 667 | * Returns the number of bytes received on success, or else the status code |
| 668 | * returned by the underlying usb_control_msg() call. |
| 669 | */ |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 670 | int usb_get_descriptor(struct usb_device *dev, unsigned char type, |
| 671 | unsigned char index, void *buf, int size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | { |
| 673 | int i; |
| 674 | int result; |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 675 | |
| 676 | memset(buf, 0, size); /* Make sure we parse really received data */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | |
| 678 | for (i = 0; i < 3; ++i) { |
Alan Stern | c39772d | 2007-08-20 10:45:28 -0400 | [diff] [blame] | 679 | /* retry on length 0 or error; some devices are flakey */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), |
| 681 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, |
| 682 | (type << 8) + index, 0, buf, size, |
| 683 | USB_CTRL_GET_TIMEOUT); |
Alan Stern | c39772d | 2007-08-20 10:45:28 -0400 | [diff] [blame] | 684 | if (result <= 0 && result != -ETIMEDOUT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | continue; |
| 686 | if (result > 1 && ((u8 *)buf)[1] != type) { |
Alan Stern | 67f5a4b | 2009-02-20 16:33:08 -0500 | [diff] [blame] | 687 | result = -ENODATA; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | continue; |
| 689 | } |
| 690 | break; |
| 691 | } |
| 692 | return result; |
| 693 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 694 | EXPORT_SYMBOL_GPL(usb_get_descriptor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | |
| 696 | /** |
| 697 | * usb_get_string - gets a string descriptor |
| 698 | * @dev: the device whose string descriptor is being retrieved |
| 699 | * @langid: code for language chosen (from string descriptor zero) |
| 700 | * @index: the number of the descriptor |
| 701 | * @buf: where to put the string |
| 702 | * @size: how big is "buf"? |
| 703 | * Context: !in_interrupt () |
| 704 | * |
| 705 | * Retrieves a string, encoded using UTF-16LE (Unicode, 16 bits per character, |
| 706 | * in little-endian byte order). |
| 707 | * The usb_string() function will often be a convenient way to turn |
| 708 | * these strings into kernel-printable form. |
| 709 | * |
| 710 | * Strings may be referenced in device, configuration, interface, or other |
| 711 | * descriptors, and could also be used in vendor-specific ways. |
| 712 | * |
| 713 | * This call is synchronous, and may not be used in an interrupt context. |
| 714 | * |
| 715 | * Returns the number of bytes received on success, or else the status code |
| 716 | * returned by the underlying usb_control_msg() call. |
| 717 | */ |
Adrian Bunk | e266a12 | 2005-11-08 21:05:43 +0100 | [diff] [blame] | 718 | static int usb_get_string(struct usb_device *dev, unsigned short langid, |
| 719 | unsigned char index, void *buf, int size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | { |
| 721 | int i; |
| 722 | int result; |
| 723 | |
| 724 | for (i = 0; i < 3; ++i) { |
| 725 | /* retry on length 0 or stall; some devices are flakey */ |
| 726 | result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), |
| 727 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, |
| 728 | (USB_DT_STRING << 8) + index, langid, buf, size, |
| 729 | USB_CTRL_GET_TIMEOUT); |
Alan Stern | 67f5a4b | 2009-02-20 16:33:08 -0500 | [diff] [blame] | 730 | if (result == 0 || result == -EPIPE) |
| 731 | continue; |
| 732 | if (result > 1 && ((u8 *) buf)[1] != USB_DT_STRING) { |
| 733 | result = -ENODATA; |
| 734 | continue; |
| 735 | } |
| 736 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | } |
| 738 | return result; |
| 739 | } |
| 740 | |
| 741 | static void usb_try_string_workarounds(unsigned char *buf, int *length) |
| 742 | { |
| 743 | int newlength, oldlength = *length; |
| 744 | |
| 745 | for (newlength = 2; newlength + 1 < oldlength; newlength += 2) |
| 746 | if (!isprint(buf[newlength]) || buf[newlength + 1]) |
| 747 | break; |
| 748 | |
| 749 | if (newlength > 2) { |
| 750 | buf[0] = newlength; |
| 751 | *length = newlength; |
| 752 | } |
| 753 | } |
| 754 | |
| 755 | static int usb_string_sub(struct usb_device *dev, unsigned int langid, |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 756 | unsigned int index, unsigned char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | { |
| 758 | int rc; |
| 759 | |
| 760 | /* Try to read the string descriptor by asking for the maximum |
| 761 | * possible number of bytes */ |
Oliver Neukum | 7ceec1f | 2007-01-26 14:26:21 +0100 | [diff] [blame] | 762 | if (dev->quirks & USB_QUIRK_STRING_FETCH_255) |
| 763 | rc = -EIO; |
| 764 | else |
| 765 | rc = usb_get_string(dev, langid, index, buf, 255); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | |
| 767 | /* If that failed try to read the descriptor length, then |
| 768 | * ask for just that many bytes */ |
| 769 | if (rc < 2) { |
| 770 | rc = usb_get_string(dev, langid, index, buf, 2); |
| 771 | if (rc == 2) |
| 772 | rc = usb_get_string(dev, langid, index, buf, buf[0]); |
| 773 | } |
| 774 | |
| 775 | if (rc >= 2) { |
| 776 | if (!buf[0] && !buf[1]) |
| 777 | usb_try_string_workarounds(buf, &rc); |
| 778 | |
| 779 | /* There might be extra junk at the end of the descriptor */ |
| 780 | if (buf[0] < rc) |
| 781 | rc = buf[0]; |
| 782 | |
| 783 | rc = rc - (rc & 1); /* force a multiple of two */ |
| 784 | } |
| 785 | |
| 786 | if (rc < 2) |
| 787 | rc = (rc < 0 ? rc : -EINVAL); |
| 788 | |
| 789 | return rc; |
| 790 | } |
| 791 | |
Daniel Mack | 0cce2ed | 2009-07-10 11:04:58 +0200 | [diff] [blame] | 792 | static int usb_get_langid(struct usb_device *dev, unsigned char *tbuf) |
| 793 | { |
| 794 | int err; |
| 795 | |
| 796 | if (dev->have_langid) |
| 797 | return 0; |
| 798 | |
| 799 | if (dev->string_langid < 0) |
| 800 | return -EPIPE; |
| 801 | |
| 802 | err = usb_string_sub(dev, 0, 0, tbuf); |
| 803 | |
| 804 | /* If the string was reported but is malformed, default to english |
| 805 | * (0x0409) */ |
| 806 | if (err == -ENODATA || (err > 0 && err < 4)) { |
| 807 | dev->string_langid = 0x0409; |
| 808 | dev->have_langid = 1; |
| 809 | dev_err(&dev->dev, |
| 810 | "string descriptor 0 malformed (err = %d), " |
| 811 | "defaulting to 0x%04x\n", |
| 812 | err, dev->string_langid); |
| 813 | return 0; |
| 814 | } |
| 815 | |
| 816 | /* In case of all other errors, we assume the device is not able to |
| 817 | * deal with strings at all. Set string_langid to -1 in order to |
| 818 | * prevent any string to be retrieved from the device */ |
| 819 | if (err < 0) { |
| 820 | dev_err(&dev->dev, "string descriptor 0 read error: %d\n", |
| 821 | err); |
| 822 | dev->string_langid = -1; |
| 823 | return -EPIPE; |
| 824 | } |
| 825 | |
| 826 | /* always use the first langid listed */ |
| 827 | dev->string_langid = tbuf[2] | (tbuf[3] << 8); |
| 828 | dev->have_langid = 1; |
| 829 | dev_dbg(&dev->dev, "default language 0x%04x\n", |
| 830 | dev->string_langid); |
| 831 | return 0; |
| 832 | } |
| 833 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | /** |
Clemens Ladisch | a853a3d | 2009-04-24 10:12:18 +0200 | [diff] [blame] | 835 | * usb_string - returns UTF-8 version of a string descriptor |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | * @dev: the device whose string descriptor is being retrieved |
| 837 | * @index: the number of the descriptor |
| 838 | * @buf: where to put the string |
| 839 | * @size: how big is "buf"? |
| 840 | * Context: !in_interrupt () |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 841 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | * This converts the UTF-16LE encoded strings returned by devices, from |
Clemens Ladisch | a853a3d | 2009-04-24 10:12:18 +0200 | [diff] [blame] | 843 | * usb_get_string_descriptor(), to null-terminated UTF-8 encoded ones |
| 844 | * that are more usable in most kernel contexts. Note that this function |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | * chooses strings in the first language supported by the device. |
| 846 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | * This call is synchronous, and may not be used in an interrupt context. |
| 848 | * |
| 849 | * Returns length of the string (>= 0) or usb_control_msg status (< 0). |
| 850 | */ |
| 851 | int usb_string(struct usb_device *dev, int index, char *buf, size_t size) |
| 852 | { |
| 853 | unsigned char *tbuf; |
| 854 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | |
| 856 | if (dev->state == USB_STATE_SUSPENDED) |
| 857 | return -EHOSTUNREACH; |
| 858 | if (size <= 0 || !buf || !index) |
| 859 | return -EINVAL; |
| 860 | buf[0] = 0; |
Alan Stern | 74675a5 | 2009-04-30 10:08:18 -0400 | [diff] [blame] | 861 | tbuf = kmalloc(256, GFP_NOIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | if (!tbuf) |
| 863 | return -ENOMEM; |
| 864 | |
Daniel Mack | 0cce2ed | 2009-07-10 11:04:58 +0200 | [diff] [blame] | 865 | err = usb_get_langid(dev, tbuf); |
| 866 | if (err < 0) |
| 867 | goto errout; |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 868 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | err = usb_string_sub(dev, dev->string_langid, index, tbuf); |
| 870 | if (err < 0) |
| 871 | goto errout; |
| 872 | |
| 873 | size--; /* leave room for trailing NULL char in output buffer */ |
Alan Stern | 74675a5 | 2009-04-30 10:08:18 -0400 | [diff] [blame] | 874 | err = utf16s_to_utf8s((wchar_t *) &tbuf[2], (err - 2) / 2, |
| 875 | UTF16_LITTLE_ENDIAN, buf, size); |
Clemens Ladisch | a853a3d | 2009-04-24 10:12:18 +0200 | [diff] [blame] | 876 | buf[err] = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | |
| 878 | if (tbuf[1] != USB_DT_STRING) |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 879 | dev_dbg(&dev->dev, |
| 880 | "wrong descriptor type %02x for string %d (\"%s\")\n", |
| 881 | tbuf[1], index, buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | |
| 883 | errout: |
| 884 | kfree(tbuf); |
| 885 | return err; |
| 886 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 887 | EXPORT_SYMBOL_GPL(usb_string); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | |
Clemens Ladisch | a853a3d | 2009-04-24 10:12:18 +0200 | [diff] [blame] | 889 | /* one UTF-8-encoded 16-bit character has at most three bytes */ |
| 890 | #define MAX_USB_STRING_SIZE (127 * 3 + 1) |
| 891 | |
Alan Stern | 4f62efe | 2005-10-24 16:24:14 -0400 | [diff] [blame] | 892 | /** |
| 893 | * usb_cache_string - read a string descriptor and cache it for later use |
| 894 | * @udev: the device whose string descriptor is being read |
| 895 | * @index: the descriptor index |
| 896 | * |
| 897 | * Returns a pointer to a kmalloc'ed buffer containing the descriptor string, |
| 898 | * or NULL if the index is 0 or the string could not be read. |
| 899 | */ |
| 900 | char *usb_cache_string(struct usb_device *udev, int index) |
| 901 | { |
| 902 | char *buf; |
| 903 | char *smallbuf = NULL; |
| 904 | int len; |
| 905 | |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 906 | if (index <= 0) |
| 907 | return NULL; |
| 908 | |
Clemens Ladisch | a853a3d | 2009-04-24 10:12:18 +0200 | [diff] [blame] | 909 | buf = kmalloc(MAX_USB_STRING_SIZE, GFP_KERNEL); |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 910 | if (buf) { |
Clemens Ladisch | a853a3d | 2009-04-24 10:12:18 +0200 | [diff] [blame] | 911 | len = usb_string(udev, index, buf, MAX_USB_STRING_SIZE); |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 912 | if (len > 0) { |
| 913 | smallbuf = kmalloc(++len, GFP_KERNEL); |
| 914 | if (!smallbuf) |
Alan Stern | 4f62efe | 2005-10-24 16:24:14 -0400 | [diff] [blame] | 915 | return buf; |
| 916 | memcpy(smallbuf, buf, len); |
| 917 | } |
| 918 | kfree(buf); |
| 919 | } |
| 920 | return smallbuf; |
| 921 | } |
| 922 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | /* |
| 924 | * usb_get_device_descriptor - (re)reads the device descriptor (usbcore) |
| 925 | * @dev: the device whose device descriptor is being updated |
| 926 | * @size: how much of the descriptor to read |
| 927 | * Context: !in_interrupt () |
| 928 | * |
| 929 | * Updates the copy of the device descriptor stored in the device structure, |
Laurent Pinchart | 6ab16a9 | 2006-11-07 10:16:25 +0100 | [diff] [blame] | 930 | * which dedicates space for this purpose. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | * |
| 932 | * Not exported, only for use by the core. If drivers really want to read |
| 933 | * the device descriptor directly, they can call usb_get_descriptor() with |
| 934 | * type = USB_DT_DEVICE and index = 0. |
| 935 | * |
| 936 | * This call is synchronous, and may not be used in an interrupt context. |
| 937 | * |
| 938 | * Returns the number of bytes received on success, or else the status code |
| 939 | * returned by the underlying usb_control_msg() call. |
| 940 | */ |
| 941 | int usb_get_device_descriptor(struct usb_device *dev, unsigned int size) |
| 942 | { |
| 943 | struct usb_device_descriptor *desc; |
| 944 | int ret; |
| 945 | |
| 946 | if (size > sizeof(*desc)) |
| 947 | return -EINVAL; |
| 948 | desc = kmalloc(sizeof(*desc), GFP_NOIO); |
| 949 | if (!desc) |
| 950 | return -ENOMEM; |
| 951 | |
| 952 | ret = usb_get_descriptor(dev, USB_DT_DEVICE, 0, desc, size); |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 953 | if (ret >= 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | memcpy(&dev->descriptor, desc, size); |
| 955 | kfree(desc); |
| 956 | return ret; |
| 957 | } |
| 958 | |
| 959 | /** |
| 960 | * usb_get_status - issues a GET_STATUS call |
| 961 | * @dev: the device whose status is being checked |
| 962 | * @type: USB_RECIP_*; for device, interface, or endpoint |
| 963 | * @target: zero (for device), else interface or endpoint number |
| 964 | * @data: pointer to two bytes of bitmap data |
| 965 | * Context: !in_interrupt () |
| 966 | * |
| 967 | * Returns device, interface, or endpoint status. Normally only of |
| 968 | * interest to see if the device is self powered, or has enabled the |
| 969 | * remote wakeup facility; or whether a bulk or interrupt endpoint |
| 970 | * is halted ("stalled"). |
| 971 | * |
| 972 | * Bits in these status bitmaps are set using the SET_FEATURE request, |
| 973 | * and cleared using the CLEAR_FEATURE request. The usb_clear_halt() |
| 974 | * function should be used to clear halt ("stall") status. |
| 975 | * |
| 976 | * This call is synchronous, and may not be used in an interrupt context. |
| 977 | * |
| 978 | * Returns the number of bytes received on success, or else the status code |
| 979 | * returned by the underlying usb_control_msg() call. |
| 980 | */ |
| 981 | int usb_get_status(struct usb_device *dev, int type, int target, void *data) |
| 982 | { |
| 983 | int ret; |
| 984 | u16 *status = kmalloc(sizeof(*status), GFP_KERNEL); |
| 985 | |
| 986 | if (!status) |
| 987 | return -ENOMEM; |
| 988 | |
| 989 | ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), |
| 990 | USB_REQ_GET_STATUS, USB_DIR_IN | type, 0, target, status, |
| 991 | sizeof(*status), USB_CTRL_GET_TIMEOUT); |
| 992 | |
| 993 | *(u16 *)data = *status; |
| 994 | kfree(status); |
| 995 | return ret; |
| 996 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 997 | EXPORT_SYMBOL_GPL(usb_get_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | |
| 999 | /** |
| 1000 | * usb_clear_halt - tells device to clear endpoint halt/stall condition |
| 1001 | * @dev: device whose endpoint is halted |
| 1002 | * @pipe: endpoint "pipe" being cleared |
| 1003 | * Context: !in_interrupt () |
| 1004 | * |
| 1005 | * This is used to clear halt conditions for bulk and interrupt endpoints, |
| 1006 | * as reported by URB completion status. Endpoints that are halted are |
| 1007 | * sometimes referred to as being "stalled". Such endpoints are unable |
| 1008 | * to transmit or receive data until the halt status is cleared. Any URBs |
| 1009 | * queued for such an endpoint should normally be unlinked by the driver |
| 1010 | * before clearing the halt condition, as described in sections 5.7.5 |
| 1011 | * and 5.8.5 of the USB 2.0 spec. |
| 1012 | * |
| 1013 | * Note that control and isochronous endpoints don't halt, although control |
| 1014 | * endpoints report "protocol stall" (for unsupported requests) using the |
| 1015 | * same status code used to report a true stall. |
| 1016 | * |
| 1017 | * This call is synchronous, and may not be used in an interrupt context. |
| 1018 | * |
| 1019 | * Returns zero on success, or else the status code returned by the |
| 1020 | * underlying usb_control_msg() call. |
| 1021 | */ |
| 1022 | int usb_clear_halt(struct usb_device *dev, int pipe) |
| 1023 | { |
| 1024 | int result; |
| 1025 | int endp = usb_pipeendpoint(pipe); |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 1026 | |
| 1027 | if (usb_pipein(pipe)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | endp |= USB_DIR_IN; |
| 1029 | |
| 1030 | /* we don't care if it wasn't halted first. in fact some devices |
| 1031 | * (like some ibmcam model 1 units) seem to expect hosts to make |
| 1032 | * this request for iso endpoints, which can't halt! |
| 1033 | */ |
| 1034 | result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), |
| 1035 | USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT, |
| 1036 | USB_ENDPOINT_HALT, endp, NULL, 0, |
| 1037 | USB_CTRL_SET_TIMEOUT); |
| 1038 | |
| 1039 | /* don't un-halt or force to DATA0 except on success */ |
| 1040 | if (result < 0) |
| 1041 | return result; |
| 1042 | |
| 1043 | /* NOTE: seems like Microsoft and Apple don't bother verifying |
| 1044 | * the clear "took", so some devices could lock up if you check... |
| 1045 | * such as the Hagiwara FlashGate DUAL. So we won't bother. |
| 1046 | * |
| 1047 | * NOTE: make sure the logic here doesn't diverge much from |
| 1048 | * the copy in usb-storage, for as long as we need two copies. |
| 1049 | */ |
| 1050 | |
David Vrabel | 3444b26 | 2009-04-08 17:36:28 +0000 | [diff] [blame] | 1051 | usb_reset_endpoint(dev, endp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | |
| 1053 | return 0; |
| 1054 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 1055 | EXPORT_SYMBOL_GPL(usb_clear_halt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | |
Alan Stern | 3b23dd6 | 2008-12-05 14:10:34 -0500 | [diff] [blame] | 1057 | static int create_intf_ep_devs(struct usb_interface *intf) |
| 1058 | { |
| 1059 | struct usb_device *udev = interface_to_usbdev(intf); |
| 1060 | struct usb_host_interface *alt = intf->cur_altsetting; |
| 1061 | int i; |
| 1062 | |
| 1063 | if (intf->ep_devs_created || intf->unregistering) |
| 1064 | return 0; |
| 1065 | |
| 1066 | for (i = 0; i < alt->desc.bNumEndpoints; ++i) |
| 1067 | (void) usb_create_ep_devs(&intf->dev, &alt->endpoint[i], udev); |
| 1068 | intf->ep_devs_created = 1; |
| 1069 | return 0; |
| 1070 | } |
| 1071 | |
| 1072 | static void remove_intf_ep_devs(struct usb_interface *intf) |
| 1073 | { |
| 1074 | struct usb_host_interface *alt = intf->cur_altsetting; |
| 1075 | int i; |
| 1076 | |
| 1077 | if (!intf->ep_devs_created) |
| 1078 | return; |
| 1079 | |
| 1080 | for (i = 0; i < alt->desc.bNumEndpoints; ++i) |
| 1081 | usb_remove_ep_devs(&alt->endpoint[i]); |
| 1082 | intf->ep_devs_created = 0; |
| 1083 | } |
| 1084 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | /** |
| 1086 | * usb_disable_endpoint -- Disable an endpoint by address |
| 1087 | * @dev: the device whose endpoint is being disabled |
| 1088 | * @epaddr: the endpoint's address. Endpoint number for output, |
| 1089 | * endpoint number + USB_DIR_IN for input |
Alan Stern | ddeac4e | 2009-01-15 17:03:33 -0500 | [diff] [blame] | 1090 | * @reset_hardware: flag to erase any endpoint state stored in the |
| 1091 | * controller hardware |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | * |
Alan Stern | ddeac4e | 2009-01-15 17:03:33 -0500 | [diff] [blame] | 1093 | * Disables the endpoint for URB submission and nukes all pending URBs. |
| 1094 | * If @reset_hardware is set then also deallocates hcd/hardware state |
| 1095 | * for the endpoint. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | */ |
Alan Stern | ddeac4e | 2009-01-15 17:03:33 -0500 | [diff] [blame] | 1097 | void usb_disable_endpoint(struct usb_device *dev, unsigned int epaddr, |
| 1098 | bool reset_hardware) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | { |
| 1100 | unsigned int epnum = epaddr & USB_ENDPOINT_NUMBER_MASK; |
| 1101 | struct usb_host_endpoint *ep; |
| 1102 | |
| 1103 | if (!dev) |
| 1104 | return; |
| 1105 | |
| 1106 | if (usb_endpoint_out(epaddr)) { |
| 1107 | ep = dev->ep_out[epnum]; |
Alan Stern | ddeac4e | 2009-01-15 17:03:33 -0500 | [diff] [blame] | 1108 | if (reset_hardware) |
| 1109 | dev->ep_out[epnum] = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | } else { |
| 1111 | ep = dev->ep_in[epnum]; |
Alan Stern | ddeac4e | 2009-01-15 17:03:33 -0500 | [diff] [blame] | 1112 | if (reset_hardware) |
| 1113 | dev->ep_in[epnum] = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | } |
Alan Stern | bdd016b | 2007-07-30 17:05:22 -0400 | [diff] [blame] | 1115 | if (ep) { |
| 1116 | ep->enabled = 0; |
Alan Stern | 95cf82f | 2007-09-10 11:33:05 -0400 | [diff] [blame] | 1117 | usb_hcd_flush_endpoint(dev, ep); |
Alan Stern | ddeac4e | 2009-01-15 17:03:33 -0500 | [diff] [blame] | 1118 | if (reset_hardware) |
| 1119 | usb_hcd_disable_endpoint(dev, ep); |
Alan Stern | bdd016b | 2007-07-30 17:05:22 -0400 | [diff] [blame] | 1120 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | } |
| 1122 | |
| 1123 | /** |
David Vrabel | 3444b26 | 2009-04-08 17:36:28 +0000 | [diff] [blame] | 1124 | * usb_reset_endpoint - Reset an endpoint's state. |
| 1125 | * @dev: the device whose endpoint is to be reset |
| 1126 | * @epaddr: the endpoint's address. Endpoint number for output, |
| 1127 | * endpoint number + USB_DIR_IN for input |
| 1128 | * |
| 1129 | * Resets any host-side endpoint state such as the toggle bit, |
| 1130 | * sequence number or current window. |
| 1131 | */ |
| 1132 | void usb_reset_endpoint(struct usb_device *dev, unsigned int epaddr) |
| 1133 | { |
| 1134 | unsigned int epnum = epaddr & USB_ENDPOINT_NUMBER_MASK; |
| 1135 | struct usb_host_endpoint *ep; |
| 1136 | |
| 1137 | if (usb_endpoint_out(epaddr)) |
| 1138 | ep = dev->ep_out[epnum]; |
| 1139 | else |
| 1140 | ep = dev->ep_in[epnum]; |
| 1141 | if (ep) |
| 1142 | usb_hcd_reset_endpoint(dev, ep); |
| 1143 | } |
| 1144 | EXPORT_SYMBOL_GPL(usb_reset_endpoint); |
| 1145 | |
| 1146 | |
| 1147 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | * usb_disable_interface -- Disable all endpoints for an interface |
| 1149 | * @dev: the device whose interface is being disabled |
| 1150 | * @intf: pointer to the interface descriptor |
Alan Stern | ddeac4e | 2009-01-15 17:03:33 -0500 | [diff] [blame] | 1151 | * @reset_hardware: flag to erase any endpoint state stored in the |
| 1152 | * controller hardware |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | * |
| 1154 | * Disables all the endpoints for the interface's current altsetting. |
| 1155 | */ |
Alan Stern | ddeac4e | 2009-01-15 17:03:33 -0500 | [diff] [blame] | 1156 | void usb_disable_interface(struct usb_device *dev, struct usb_interface *intf, |
| 1157 | bool reset_hardware) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | { |
| 1159 | struct usb_host_interface *alt = intf->cur_altsetting; |
| 1160 | int i; |
| 1161 | |
| 1162 | for (i = 0; i < alt->desc.bNumEndpoints; ++i) { |
| 1163 | usb_disable_endpoint(dev, |
Alan Stern | ddeac4e | 2009-01-15 17:03:33 -0500 | [diff] [blame] | 1164 | alt->endpoint[i].desc.bEndpointAddress, |
| 1165 | reset_hardware); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | } |
| 1167 | } |
| 1168 | |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 1169 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | * usb_disable_device - Disable all the endpoints for a USB device |
| 1171 | * @dev: the device whose endpoints are being disabled |
| 1172 | * @skip_ep0: 0 to disable endpoint 0, 1 to skip it. |
| 1173 | * |
| 1174 | * Disables all the device's endpoints, potentially including endpoint 0. |
| 1175 | * Deallocates hcd/hardware state for the endpoints (nuking all or most |
| 1176 | * pending urbs) and usbcore state for the interfaces, so that usbcore |
| 1177 | * must usb_set_configuration() before any interfaces could be used. |
| 1178 | */ |
| 1179 | void usb_disable_device(struct usb_device *dev, int skip_ep0) |
| 1180 | { |
| 1181 | int i; |
| 1182 | |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1183 | dev_dbg(&dev->dev, "%s nuking %s URBs\n", __func__, |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 1184 | skip_ep0 ? "non-ep0" : "all"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | for (i = skip_ep0; i < 16; ++i) { |
Alan Stern | ddeac4e | 2009-01-15 17:03:33 -0500 | [diff] [blame] | 1186 | usb_disable_endpoint(dev, i, true); |
| 1187 | usb_disable_endpoint(dev, i + USB_DIR_IN, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | |
| 1190 | /* getting rid of interfaces will disconnect |
| 1191 | * any drivers bound to them (a key side effect) |
| 1192 | */ |
| 1193 | if (dev->actconfig) { |
| 1194 | for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) { |
| 1195 | struct usb_interface *interface; |
| 1196 | |
Alan Stern | 86d3074 | 2005-07-29 12:17:16 -0700 | [diff] [blame] | 1197 | /* remove this interface if it has been registered */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | interface = dev->actconfig->interface[i]; |
Daniel Ritz | d305ef5 | 2005-09-22 00:47:24 -0700 | [diff] [blame] | 1199 | if (!device_is_registered(&interface->dev)) |
Alan Stern | 86d3074 | 2005-07-29 12:17:16 -0700 | [diff] [blame] | 1200 | continue; |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 1201 | dev_dbg(&dev->dev, "unregistering interface %s\n", |
Kay Sievers | 7071a3c | 2008-05-02 06:02:41 +0200 | [diff] [blame] | 1202 | dev_name(&interface->dev)); |
Alan Stern | 352d026 | 2008-10-29 15:16:58 -0400 | [diff] [blame] | 1203 | interface->unregistering = 1; |
Alan Stern | 3b23dd6 | 2008-12-05 14:10:34 -0500 | [diff] [blame] | 1204 | remove_intf_ep_devs(interface); |
Alan Stern | 1a21175 | 2008-07-30 11:31:50 -0400 | [diff] [blame] | 1205 | device_del(&interface->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1206 | } |
| 1207 | |
| 1208 | /* Now that the interfaces are unbound, nobody should |
| 1209 | * try to access them. |
| 1210 | */ |
| 1211 | for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) { |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 1212 | put_device(&dev->actconfig->interface[i]->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | dev->actconfig->interface[i] = NULL; |
| 1214 | } |
| 1215 | dev->actconfig = NULL; |
| 1216 | if (dev->state == USB_STATE_CONFIGURED) |
| 1217 | usb_set_device_state(dev, USB_STATE_ADDRESS); |
| 1218 | } |
| 1219 | } |
| 1220 | |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 1221 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1222 | * usb_enable_endpoint - Enable an endpoint for USB communications |
| 1223 | * @dev: the device whose interface is being enabled |
| 1224 | * @ep: the endpoint |
David Vrabel | 3444b26 | 2009-04-08 17:36:28 +0000 | [diff] [blame] | 1225 | * @reset_ep: flag to reset the endpoint state |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | * |
David Vrabel | 3444b26 | 2009-04-08 17:36:28 +0000 | [diff] [blame] | 1227 | * Resets the endpoint state if asked, and sets dev->ep_{in,out} pointers. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | * For control endpoints, both the input and output sides are handled. |
| 1229 | */ |
Alan Stern | 2caf7fc | 2008-12-31 11:31:33 -0500 | [diff] [blame] | 1230 | void usb_enable_endpoint(struct usb_device *dev, struct usb_host_endpoint *ep, |
David Vrabel | 3444b26 | 2009-04-08 17:36:28 +0000 | [diff] [blame] | 1231 | bool reset_ep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | { |
Alan Stern | bdd016b | 2007-07-30 17:05:22 -0400 | [diff] [blame] | 1233 | int epnum = usb_endpoint_num(&ep->desc); |
| 1234 | int is_out = usb_endpoint_dir_out(&ep->desc); |
| 1235 | int is_control = usb_endpoint_xfer_control(&ep->desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | |
David Vrabel | 3444b26 | 2009-04-08 17:36:28 +0000 | [diff] [blame] | 1237 | if (reset_ep) |
| 1238 | usb_hcd_reset_endpoint(dev, ep); |
| 1239 | if (is_out || is_control) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | dev->ep_out[epnum] = ep; |
David Vrabel | 3444b26 | 2009-04-08 17:36:28 +0000 | [diff] [blame] | 1241 | if (!is_out || is_control) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | dev->ep_in[epnum] = ep; |
Alan Stern | bdd016b | 2007-07-30 17:05:22 -0400 | [diff] [blame] | 1243 | ep->enabled = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1244 | } |
| 1245 | |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 1246 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | * usb_enable_interface - Enable all the endpoints for an interface |
| 1248 | * @dev: the device whose interface is being enabled |
| 1249 | * @intf: pointer to the interface descriptor |
David Vrabel | 3444b26 | 2009-04-08 17:36:28 +0000 | [diff] [blame] | 1250 | * @reset_eps: flag to reset the endpoints' state |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1251 | * |
| 1252 | * Enables all the endpoints for the interface's current altsetting. |
| 1253 | */ |
Alan Stern | 2caf7fc | 2008-12-31 11:31:33 -0500 | [diff] [blame] | 1254 | void usb_enable_interface(struct usb_device *dev, |
David Vrabel | 3444b26 | 2009-04-08 17:36:28 +0000 | [diff] [blame] | 1255 | struct usb_interface *intf, bool reset_eps) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | { |
| 1257 | struct usb_host_interface *alt = intf->cur_altsetting; |
| 1258 | int i; |
| 1259 | |
| 1260 | for (i = 0; i < alt->desc.bNumEndpoints; ++i) |
David Vrabel | 3444b26 | 2009-04-08 17:36:28 +0000 | [diff] [blame] | 1261 | usb_enable_endpoint(dev, &alt->endpoint[i], reset_eps); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | } |
| 1263 | |
| 1264 | /** |
| 1265 | * usb_set_interface - Makes a particular alternate setting be current |
| 1266 | * @dev: the device whose interface is being updated |
| 1267 | * @interface: the interface being updated |
| 1268 | * @alternate: the setting being chosen. |
| 1269 | * Context: !in_interrupt () |
| 1270 | * |
| 1271 | * This is used to enable data transfers on interfaces that may not |
| 1272 | * be enabled by default. Not all devices support such configurability. |
| 1273 | * Only the driver bound to an interface may change its setting. |
| 1274 | * |
| 1275 | * Within any given configuration, each interface may have several |
| 1276 | * alternative settings. These are often used to control levels of |
| 1277 | * bandwidth consumption. For example, the default setting for a high |
| 1278 | * speed interrupt endpoint may not send more than 64 bytes per microframe, |
| 1279 | * while interrupt transfers of up to 3KBytes per microframe are legal. |
| 1280 | * Also, isochronous endpoints may never be part of an |
| 1281 | * interface's default setting. To access such bandwidth, alternate |
| 1282 | * interface settings must be made current. |
| 1283 | * |
| 1284 | * Note that in the Linux USB subsystem, bandwidth associated with |
| 1285 | * an endpoint in a given alternate setting is not reserved until an URB |
| 1286 | * is submitted that needs that bandwidth. Some other operating systems |
| 1287 | * allocate bandwidth early, when a configuration is chosen. |
| 1288 | * |
| 1289 | * This call is synchronous, and may not be used in an interrupt context. |
| 1290 | * Also, drivers must not change altsettings while urbs are scheduled for |
| 1291 | * endpoints in that interface; all such urbs must first be completed |
| 1292 | * (perhaps forced by unlinking). |
| 1293 | * |
| 1294 | * Returns zero on success, or else the status code returned by the |
| 1295 | * underlying usb_control_msg() call. |
| 1296 | */ |
| 1297 | int usb_set_interface(struct usb_device *dev, int interface, int alternate) |
| 1298 | { |
| 1299 | struct usb_interface *iface; |
| 1300 | struct usb_host_interface *alt; |
Sarah Sharp | 3f0479e | 2009-12-03 09:44:36 -0800 | [diff] [blame] | 1301 | struct usb_hcd *hcd = bus_to_hcd(dev->bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | int ret; |
| 1303 | int manual = 0; |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 1304 | unsigned int epaddr; |
| 1305 | unsigned int pipe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | |
| 1307 | if (dev->state == USB_STATE_SUSPENDED) |
| 1308 | return -EHOSTUNREACH; |
| 1309 | |
| 1310 | iface = usb_ifnum_to_if(dev, interface); |
| 1311 | if (!iface) { |
| 1312 | dev_dbg(&dev->dev, "selecting invalid interface %d\n", |
| 1313 | interface); |
| 1314 | return -EINVAL; |
| 1315 | } |
| 1316 | |
| 1317 | alt = usb_altnum_to_altsetting(iface, alternate); |
| 1318 | if (!alt) { |
Greg Kroah-Hartman | 3b6004f | 2008-08-14 09:37:34 -0700 | [diff] [blame] | 1319 | dev_warn(&dev->dev, "selecting invalid altsetting %d", |
| 1320 | alternate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | return -EINVAL; |
| 1322 | } |
| 1323 | |
Sarah Sharp | 3f0479e | 2009-12-03 09:44:36 -0800 | [diff] [blame] | 1324 | /* Make sure we have enough bandwidth for this alternate interface. |
| 1325 | * Remove the current alt setting and add the new alt setting. |
| 1326 | */ |
| 1327 | mutex_lock(&hcd->bandwidth_mutex); |
| 1328 | ret = usb_hcd_alloc_bandwidth(dev, NULL, iface->cur_altsetting, alt); |
| 1329 | if (ret < 0) { |
| 1330 | dev_info(&dev->dev, "Not enough bandwidth for altsetting %d\n", |
| 1331 | alternate); |
| 1332 | mutex_unlock(&hcd->bandwidth_mutex); |
| 1333 | return ret; |
| 1334 | } |
| 1335 | |
Alan Stern | 392e1d9 | 2008-03-11 10:20:12 -0400 | [diff] [blame] | 1336 | if (dev->quirks & USB_QUIRK_NO_SET_INTF) |
| 1337 | ret = -EPIPE; |
| 1338 | else |
| 1339 | ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1340 | USB_REQ_SET_INTERFACE, USB_RECIP_INTERFACE, |
| 1341 | alternate, interface, NULL, 0, 5000); |
| 1342 | |
| 1343 | /* 9.4.10 says devices don't need this and are free to STALL the |
| 1344 | * request if the interface only has one alternate setting. |
| 1345 | */ |
| 1346 | if (ret == -EPIPE && iface->num_altsetting == 1) { |
| 1347 | dev_dbg(&dev->dev, |
| 1348 | "manual set_interface for iface %d, alt %d\n", |
| 1349 | interface, alternate); |
| 1350 | manual = 1; |
Sarah Sharp | 3f0479e | 2009-12-03 09:44:36 -0800 | [diff] [blame] | 1351 | } else if (ret < 0) { |
| 1352 | /* Re-instate the old alt setting */ |
| 1353 | usb_hcd_alloc_bandwidth(dev, NULL, alt, iface->cur_altsetting); |
| 1354 | mutex_unlock(&hcd->bandwidth_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1355 | return ret; |
Sarah Sharp | 3f0479e | 2009-12-03 09:44:36 -0800 | [diff] [blame] | 1356 | } |
| 1357 | mutex_unlock(&hcd->bandwidth_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1358 | |
| 1359 | /* FIXME drivers shouldn't need to replicate/bugfix the logic here |
| 1360 | * when they implement async or easily-killable versions of this or |
| 1361 | * other "should-be-internal" functions (like clear_halt). |
| 1362 | * should hcd+usbcore postprocess control requests? |
| 1363 | */ |
| 1364 | |
| 1365 | /* prevent submissions using previous endpoint settings */ |
Alan Stern | 3b23dd6 | 2008-12-05 14:10:34 -0500 | [diff] [blame] | 1366 | if (iface->cur_altsetting != alt) { |
| 1367 | remove_intf_ep_devs(iface); |
Alan Stern | 0e6c8e8 | 2005-10-24 15:33:03 -0400 | [diff] [blame] | 1368 | usb_remove_sysfs_intf_files(iface); |
Alan Stern | 3b23dd6 | 2008-12-05 14:10:34 -0500 | [diff] [blame] | 1369 | } |
Alan Stern | ddeac4e | 2009-01-15 17:03:33 -0500 | [diff] [blame] | 1370 | usb_disable_interface(dev, iface, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1371 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | iface->cur_altsetting = alt; |
| 1373 | |
| 1374 | /* If the interface only has one altsetting and the device didn't |
David Brownell | a81e7ec | 2005-04-18 17:39:25 -0700 | [diff] [blame] | 1375 | * accept the request, we attempt to carry out the equivalent action |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | * by manually clearing the HALT feature for each endpoint in the |
| 1377 | * new altsetting. |
| 1378 | */ |
| 1379 | if (manual) { |
| 1380 | int i; |
| 1381 | |
| 1382 | for (i = 0; i < alt->desc.bNumEndpoints; i++) { |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 1383 | epaddr = alt->endpoint[i].desc.bEndpointAddress; |
| 1384 | pipe = __create_pipe(dev, |
| 1385 | USB_ENDPOINT_NUMBER_MASK & epaddr) | |
| 1386 | (usb_endpoint_out(epaddr) ? |
| 1387 | USB_DIR_OUT : USB_DIR_IN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | |
| 1389 | usb_clear_halt(dev, pipe); |
| 1390 | } |
| 1391 | } |
| 1392 | |
| 1393 | /* 9.1.1.5: reset toggles for all endpoints in the new altsetting |
| 1394 | * |
| 1395 | * Note: |
| 1396 | * Despite EP0 is always present in all interfaces/AS, the list of |
| 1397 | * endpoints from the descriptor does not contain EP0. Due to its |
| 1398 | * omnipresence one might expect EP0 being considered "affected" by |
| 1399 | * any SetInterface request and hence assume toggles need to be reset. |
| 1400 | * However, EP0 toggles are re-synced for every individual transfer |
| 1401 | * during the SETUP stage - hence EP0 toggles are "don't care" here. |
| 1402 | * (Likewise, EP0 never "halts" on well designed devices.) |
| 1403 | */ |
Alan Stern | 2caf7fc | 2008-12-31 11:31:33 -0500 | [diff] [blame] | 1404 | usb_enable_interface(dev, iface, true); |
Alan Stern | 3b23dd6 | 2008-12-05 14:10:34 -0500 | [diff] [blame] | 1405 | if (device_is_registered(&iface->dev)) { |
Alan Stern | 0e6c8e8 | 2005-10-24 15:33:03 -0400 | [diff] [blame] | 1406 | usb_create_sysfs_intf_files(iface); |
Alan Stern | 3b23dd6 | 2008-12-05 14:10:34 -0500 | [diff] [blame] | 1407 | create_intf_ep_devs(iface); |
| 1408 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | return 0; |
| 1410 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 1411 | EXPORT_SYMBOL_GPL(usb_set_interface); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1412 | |
| 1413 | /** |
| 1414 | * usb_reset_configuration - lightweight device reset |
| 1415 | * @dev: the device whose configuration is being reset |
| 1416 | * |
| 1417 | * This issues a standard SET_CONFIGURATION request to the device using |
| 1418 | * the current configuration. The effect is to reset most USB-related |
| 1419 | * state in the device, including interface altsettings (reset to zero), |
David Vrabel | 3444b26 | 2009-04-08 17:36:28 +0000 | [diff] [blame] | 1420 | * endpoint halts (cleared), and endpoint state (only for bulk and interrupt |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | * endpoints). Other usbcore state is unchanged, including bindings of |
| 1422 | * usb device drivers to interfaces. |
| 1423 | * |
| 1424 | * Because this affects multiple interfaces, avoid using this with composite |
| 1425 | * (multi-interface) devices. Instead, the driver for each interface may |
David Brownell | a81e7ec | 2005-04-18 17:39:25 -0700 | [diff] [blame] | 1426 | * use usb_set_interface() on the interfaces it claims. Be careful though; |
| 1427 | * some devices don't support the SET_INTERFACE request, and others won't |
David Vrabel | 3444b26 | 2009-04-08 17:36:28 +0000 | [diff] [blame] | 1428 | * reset all the interface state (notably endpoint state). Resetting the whole |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | * configuration would affect other drivers' interfaces. |
| 1430 | * |
| 1431 | * The caller must own the device lock. |
| 1432 | * |
| 1433 | * Returns zero on success, else a negative error code. |
| 1434 | */ |
| 1435 | int usb_reset_configuration(struct usb_device *dev) |
| 1436 | { |
| 1437 | int i, retval; |
| 1438 | struct usb_host_config *config; |
Sarah Sharp | 3f0479e | 2009-12-03 09:44:36 -0800 | [diff] [blame] | 1439 | struct usb_hcd *hcd = bus_to_hcd(dev->bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | |
| 1441 | if (dev->state == USB_STATE_SUSPENDED) |
| 1442 | return -EHOSTUNREACH; |
| 1443 | |
| 1444 | /* caller must have locked the device and must own |
| 1445 | * the usb bus readlock (so driver bindings are stable); |
| 1446 | * calls during probe() are fine |
| 1447 | */ |
| 1448 | |
| 1449 | for (i = 1; i < 16; ++i) { |
Alan Stern | ddeac4e | 2009-01-15 17:03:33 -0500 | [diff] [blame] | 1450 | usb_disable_endpoint(dev, i, true); |
| 1451 | usb_disable_endpoint(dev, i + USB_DIR_IN, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | } |
| 1453 | |
| 1454 | config = dev->actconfig; |
Sarah Sharp | 3f0479e | 2009-12-03 09:44:36 -0800 | [diff] [blame] | 1455 | retval = 0; |
| 1456 | mutex_lock(&hcd->bandwidth_mutex); |
| 1457 | /* Make sure we have enough bandwidth for each alternate setting 0 */ |
| 1458 | for (i = 0; i < config->desc.bNumInterfaces; i++) { |
| 1459 | struct usb_interface *intf = config->interface[i]; |
| 1460 | struct usb_host_interface *alt; |
| 1461 | |
| 1462 | alt = usb_altnum_to_altsetting(intf, 0); |
| 1463 | if (!alt) |
| 1464 | alt = &intf->altsetting[0]; |
| 1465 | if (alt != intf->cur_altsetting) |
| 1466 | retval = usb_hcd_alloc_bandwidth(dev, NULL, |
| 1467 | intf->cur_altsetting, alt); |
| 1468 | if (retval < 0) |
| 1469 | break; |
| 1470 | } |
| 1471 | /* If not, reinstate the old alternate settings */ |
| 1472 | if (retval < 0) { |
| 1473 | reset_old_alts: |
| 1474 | for (; i >= 0; i--) { |
| 1475 | struct usb_interface *intf = config->interface[i]; |
| 1476 | struct usb_host_interface *alt; |
| 1477 | |
| 1478 | alt = usb_altnum_to_altsetting(intf, 0); |
| 1479 | if (!alt) |
| 1480 | alt = &intf->altsetting[0]; |
| 1481 | if (alt != intf->cur_altsetting) |
| 1482 | usb_hcd_alloc_bandwidth(dev, NULL, |
| 1483 | alt, intf->cur_altsetting); |
| 1484 | } |
| 1485 | mutex_unlock(&hcd->bandwidth_mutex); |
| 1486 | return retval; |
| 1487 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1488 | retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), |
| 1489 | USB_REQ_SET_CONFIGURATION, 0, |
| 1490 | config->desc.bConfigurationValue, 0, |
| 1491 | NULL, 0, USB_CTRL_SET_TIMEOUT); |
Alan Stern | 0e6c8e8 | 2005-10-24 15:33:03 -0400 | [diff] [blame] | 1492 | if (retval < 0) |
Sarah Sharp | 3f0479e | 2009-12-03 09:44:36 -0800 | [diff] [blame] | 1493 | goto reset_old_alts; |
| 1494 | mutex_unlock(&hcd->bandwidth_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1495 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | /* re-init hc/hcd interface/endpoint state */ |
| 1497 | for (i = 0; i < config->desc.bNumInterfaces; i++) { |
| 1498 | struct usb_interface *intf = config->interface[i]; |
| 1499 | struct usb_host_interface *alt; |
| 1500 | |
| 1501 | alt = usb_altnum_to_altsetting(intf, 0); |
| 1502 | |
| 1503 | /* No altsetting 0? We'll assume the first altsetting. |
| 1504 | * We could use a GetInterface call, but if a device is |
| 1505 | * so non-compliant that it doesn't have altsetting 0 |
| 1506 | * then I wouldn't trust its reply anyway. |
| 1507 | */ |
| 1508 | if (!alt) |
| 1509 | alt = &intf->altsetting[0]; |
| 1510 | |
Alan Stern | 3b23dd6 | 2008-12-05 14:10:34 -0500 | [diff] [blame] | 1511 | if (alt != intf->cur_altsetting) { |
| 1512 | remove_intf_ep_devs(intf); |
| 1513 | usb_remove_sysfs_intf_files(intf); |
| 1514 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1515 | intf->cur_altsetting = alt; |
Alan Stern | 2caf7fc | 2008-12-31 11:31:33 -0500 | [diff] [blame] | 1516 | usb_enable_interface(dev, intf, true); |
Alan Stern | 3b23dd6 | 2008-12-05 14:10:34 -0500 | [diff] [blame] | 1517 | if (device_is_registered(&intf->dev)) { |
Alan Stern | 0e6c8e8 | 2005-10-24 15:33:03 -0400 | [diff] [blame] | 1518 | usb_create_sysfs_intf_files(intf); |
Alan Stern | 3b23dd6 | 2008-12-05 14:10:34 -0500 | [diff] [blame] | 1519 | create_intf_ep_devs(intf); |
| 1520 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1521 | } |
| 1522 | return 0; |
| 1523 | } |
Greg Kroah-Hartman | 782e70c | 2008-01-25 11:12:21 -0600 | [diff] [blame] | 1524 | EXPORT_SYMBOL_GPL(usb_reset_configuration); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | |
Greg Kroah-Hartman | b0e396e | 2007-08-02 22:44:27 -0600 | [diff] [blame] | 1526 | static void usb_release_interface(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1527 | { |
| 1528 | struct usb_interface *intf = to_usb_interface(dev); |
| 1529 | struct usb_interface_cache *intfc = |
| 1530 | altsetting_to_usb_interface_cache(intf->altsetting); |
| 1531 | |
| 1532 | kref_put(&intfc->ref, usb_release_interface_cache); |
| 1533 | kfree(intf); |
| 1534 | } |
| 1535 | |
Kay Sievers | 9f8b17e | 2007-03-13 15:59:31 +0100 | [diff] [blame] | 1536 | #ifdef CONFIG_HOTPLUG |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 1537 | static int usb_if_uevent(struct device *dev, struct kobj_uevent_env *env) |
Kay Sievers | 9f8b17e | 2007-03-13 15:59:31 +0100 | [diff] [blame] | 1538 | { |
| 1539 | struct usb_device *usb_dev; |
| 1540 | struct usb_interface *intf; |
| 1541 | struct usb_host_interface *alt; |
Kay Sievers | 9f8b17e | 2007-03-13 15:59:31 +0100 | [diff] [blame] | 1542 | |
Kay Sievers | 9f8b17e | 2007-03-13 15:59:31 +0100 | [diff] [blame] | 1543 | intf = to_usb_interface(dev); |
| 1544 | usb_dev = interface_to_usbdev(intf); |
| 1545 | alt = intf->cur_altsetting; |
| 1546 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 1547 | if (add_uevent_var(env, "INTERFACE=%d/%d/%d", |
Kay Sievers | 9f8b17e | 2007-03-13 15:59:31 +0100 | [diff] [blame] | 1548 | alt->desc.bInterfaceClass, |
| 1549 | alt->desc.bInterfaceSubClass, |
| 1550 | alt->desc.bInterfaceProtocol)) |
| 1551 | return -ENOMEM; |
| 1552 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 1553 | if (add_uevent_var(env, |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 1554 | "MODALIAS=usb:" |
| 1555 | "v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02Xic%02Xisc%02Xip%02X", |
Kay Sievers | 9f8b17e | 2007-03-13 15:59:31 +0100 | [diff] [blame] | 1556 | le16_to_cpu(usb_dev->descriptor.idVendor), |
| 1557 | le16_to_cpu(usb_dev->descriptor.idProduct), |
| 1558 | le16_to_cpu(usb_dev->descriptor.bcdDevice), |
| 1559 | usb_dev->descriptor.bDeviceClass, |
| 1560 | usb_dev->descriptor.bDeviceSubClass, |
| 1561 | usb_dev->descriptor.bDeviceProtocol, |
| 1562 | alt->desc.bInterfaceClass, |
| 1563 | alt->desc.bInterfaceSubClass, |
| 1564 | alt->desc.bInterfaceProtocol)) |
| 1565 | return -ENOMEM; |
| 1566 | |
Kay Sievers | 9f8b17e | 2007-03-13 15:59:31 +0100 | [diff] [blame] | 1567 | return 0; |
| 1568 | } |
| 1569 | |
| 1570 | #else |
| 1571 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 1572 | static int usb_if_uevent(struct device *dev, struct kobj_uevent_env *env) |
Kay Sievers | 9f8b17e | 2007-03-13 15:59:31 +0100 | [diff] [blame] | 1573 | { |
| 1574 | return -ENODEV; |
| 1575 | } |
| 1576 | #endif /* CONFIG_HOTPLUG */ |
| 1577 | |
| 1578 | struct device_type usb_if_device_type = { |
| 1579 | .name = "usb_interface", |
| 1580 | .release = usb_release_interface, |
| 1581 | .uevent = usb_if_uevent, |
| 1582 | }; |
| 1583 | |
Craig W. Nadler | 165fe97 | 2007-06-15 23:14:35 -0400 | [diff] [blame] | 1584 | static struct usb_interface_assoc_descriptor *find_iad(struct usb_device *dev, |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 1585 | struct usb_host_config *config, |
| 1586 | u8 inum) |
Craig W. Nadler | 165fe97 | 2007-06-15 23:14:35 -0400 | [diff] [blame] | 1587 | { |
| 1588 | struct usb_interface_assoc_descriptor *retval = NULL; |
| 1589 | struct usb_interface_assoc_descriptor *intf_assoc; |
| 1590 | int first_intf; |
| 1591 | int last_intf; |
| 1592 | int i; |
| 1593 | |
| 1594 | for (i = 0; (i < USB_MAXIADS && config->intf_assoc[i]); i++) { |
| 1595 | intf_assoc = config->intf_assoc[i]; |
| 1596 | if (intf_assoc->bInterfaceCount == 0) |
| 1597 | continue; |
| 1598 | |
| 1599 | first_intf = intf_assoc->bFirstInterface; |
| 1600 | last_intf = first_intf + (intf_assoc->bInterfaceCount - 1); |
| 1601 | if (inum >= first_intf && inum <= last_intf) { |
| 1602 | if (!retval) |
| 1603 | retval = intf_assoc; |
| 1604 | else |
| 1605 | dev_err(&dev->dev, "Interface #%d referenced" |
| 1606 | " by multiple IADs\n", inum); |
| 1607 | } |
| 1608 | } |
| 1609 | |
| 1610 | return retval; |
| 1611 | } |
| 1612 | |
Inaky Perez-Gonzalez | dc023dc | 2008-11-13 10:31:35 -0800 | [diff] [blame] | 1613 | |
| 1614 | /* |
| 1615 | * Internal function to queue a device reset |
| 1616 | * |
| 1617 | * This is initialized into the workstruct in 'struct |
| 1618 | * usb_device->reset_ws' that is launched by |
| 1619 | * message.c:usb_set_configuration() when initializing each 'struct |
| 1620 | * usb_interface'. |
| 1621 | * |
| 1622 | * It is safe to get the USB device without reference counts because |
| 1623 | * the life cycle of @iface is bound to the life cycle of @udev. Then, |
| 1624 | * this function will be ran only if @iface is alive (and before |
| 1625 | * freeing it any scheduled instances of it will have been cancelled). |
| 1626 | * |
| 1627 | * We need to set a flag (usb_dev->reset_running) because when we call |
| 1628 | * the reset, the interfaces might be unbound. The current interface |
| 1629 | * cannot try to remove the queued work as it would cause a deadlock |
| 1630 | * (you cannot remove your work from within your executing |
| 1631 | * workqueue). This flag lets it know, so that |
| 1632 | * usb_cancel_queued_reset() doesn't try to do it. |
| 1633 | * |
| 1634 | * See usb_queue_reset_device() for more details |
| 1635 | */ |
Felipe Balbi | 09e81f3 | 2009-12-04 15:47:44 +0200 | [diff] [blame] | 1636 | static void __usb_queue_reset_device(struct work_struct *ws) |
Inaky Perez-Gonzalez | dc023dc | 2008-11-13 10:31:35 -0800 | [diff] [blame] | 1637 | { |
| 1638 | int rc; |
| 1639 | struct usb_interface *iface = |
| 1640 | container_of(ws, struct usb_interface, reset_ws); |
| 1641 | struct usb_device *udev = interface_to_usbdev(iface); |
| 1642 | |
| 1643 | rc = usb_lock_device_for_reset(udev, iface); |
| 1644 | if (rc >= 0) { |
| 1645 | iface->reset_running = 1; |
| 1646 | usb_reset_device(udev); |
| 1647 | iface->reset_running = 0; |
| 1648 | usb_unlock_device(udev); |
| 1649 | } |
| 1650 | } |
| 1651 | |
| 1652 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | /* |
| 1654 | * usb_set_configuration - Makes a particular device setting be current |
| 1655 | * @dev: the device whose configuration is being updated |
| 1656 | * @configuration: the configuration being chosen. |
| 1657 | * Context: !in_interrupt(), caller owns the device lock |
| 1658 | * |
| 1659 | * This is used to enable non-default device modes. Not all devices |
| 1660 | * use this kind of configurability; many devices only have one |
| 1661 | * configuration. |
| 1662 | * |
Alan Stern | 3f141e2 | 2007-02-08 16:40:43 -0500 | [diff] [blame] | 1663 | * @configuration is the value of the configuration to be installed. |
| 1664 | * According to the USB spec (e.g. section 9.1.1.5), configuration values |
| 1665 | * must be non-zero; a value of zero indicates that the device in |
| 1666 | * unconfigured. However some devices erroneously use 0 as one of their |
| 1667 | * configuration values. To help manage such devices, this routine will |
| 1668 | * accept @configuration = -1 as indicating the device should be put in |
| 1669 | * an unconfigured state. |
| 1670 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | * USB device configurations may affect Linux interoperability, |
| 1672 | * power consumption and the functionality available. For example, |
| 1673 | * the default configuration is limited to using 100mA of bus power, |
| 1674 | * so that when certain device functionality requires more power, |
| 1675 | * and the device is bus powered, that functionality should be in some |
| 1676 | * non-default device configuration. Other device modes may also be |
| 1677 | * reflected as configuration options, such as whether two ISDN |
| 1678 | * channels are available independently; and choosing between open |
| 1679 | * standard device protocols (like CDC) or proprietary ones. |
| 1680 | * |
Inaky Perez-Gonzalez | 16bbab2 | 2007-07-31 20:34:01 -0700 | [diff] [blame] | 1681 | * Note that a non-authorized device (dev->authorized == 0) will only |
| 1682 | * be put in unconfigured mode. |
| 1683 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | * Note that USB has an additional level of device configurability, |
| 1685 | * associated with interfaces. That configurability is accessed using |
| 1686 | * usb_set_interface(). |
| 1687 | * |
| 1688 | * This call is synchronous. The calling context must be able to sleep, |
| 1689 | * must own the device lock, and must not hold the driver model's USB |
Ming Lei | 6d243e5 | 2008-06-17 23:24:08 +0800 | [diff] [blame] | 1690 | * bus mutex; usb interface driver probe() methods cannot use this routine. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1691 | * |
| 1692 | * Returns zero on success, or else the status code returned by the |
Steven Cole | 093cf72 | 2005-05-03 19:07:24 -0600 | [diff] [blame] | 1693 | * underlying call that failed. On successful completion, each interface |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1694 | * in the original device configuration has been destroyed, and each one |
| 1695 | * in the new configuration has been probed by all relevant usb device |
| 1696 | * drivers currently known to the kernel. |
| 1697 | */ |
| 1698 | int usb_set_configuration(struct usb_device *dev, int configuration) |
| 1699 | { |
| 1700 | int i, ret; |
| 1701 | struct usb_host_config *cp = NULL; |
| 1702 | struct usb_interface **new_interfaces = NULL; |
Sarah Sharp | 3f0479e | 2009-12-03 09:44:36 -0800 | [diff] [blame] | 1703 | struct usb_hcd *hcd = bus_to_hcd(dev->bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1704 | int n, nintf; |
| 1705 | |
Inaky Perez-Gonzalez | 16bbab2 | 2007-07-31 20:34:01 -0700 | [diff] [blame] | 1706 | if (dev->authorized == 0 || configuration == -1) |
Alan Stern | 3f141e2 | 2007-02-08 16:40:43 -0500 | [diff] [blame] | 1707 | configuration = 0; |
| 1708 | else { |
| 1709 | for (i = 0; i < dev->descriptor.bNumConfigurations; i++) { |
| 1710 | if (dev->config[i].desc.bConfigurationValue == |
| 1711 | configuration) { |
| 1712 | cp = &dev->config[i]; |
| 1713 | break; |
| 1714 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1715 | } |
| 1716 | } |
| 1717 | if ((!cp && configuration != 0)) |
| 1718 | return -EINVAL; |
| 1719 | |
| 1720 | /* The USB spec says configuration 0 means unconfigured. |
| 1721 | * But if a device includes a configuration numbered 0, |
| 1722 | * we will accept it as a correctly configured state. |
Alan Stern | 3f141e2 | 2007-02-08 16:40:43 -0500 | [diff] [blame] | 1723 | * Use -1 if you really want to unconfigure the device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1724 | */ |
| 1725 | if (cp && configuration == 0) |
| 1726 | dev_warn(&dev->dev, "config 0 descriptor??\n"); |
| 1727 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1728 | /* Allocate memory for new interfaces before doing anything else, |
| 1729 | * so that if we run out then nothing will have changed. */ |
| 1730 | n = nintf = 0; |
| 1731 | if (cp) { |
| 1732 | nintf = cp->desc.bNumInterfaces; |
| 1733 | new_interfaces = kmalloc(nintf * sizeof(*new_interfaces), |
| 1734 | GFP_KERNEL); |
| 1735 | if (!new_interfaces) { |
Joe Perches | 898eb71 | 2007-10-18 03:06:30 -0700 | [diff] [blame] | 1736 | dev_err(&dev->dev, "Out of memory\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1737 | return -ENOMEM; |
| 1738 | } |
| 1739 | |
| 1740 | for (; n < nintf; ++n) { |
Alan Stern | 0a1ef3b | 2005-10-24 15:38:24 -0400 | [diff] [blame] | 1741 | new_interfaces[n] = kzalloc( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | sizeof(struct usb_interface), |
| 1743 | GFP_KERNEL); |
| 1744 | if (!new_interfaces[n]) { |
Joe Perches | 898eb71 | 2007-10-18 03:06:30 -0700 | [diff] [blame] | 1745 | dev_err(&dev->dev, "Out of memory\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1746 | ret = -ENOMEM; |
| 1747 | free_interfaces: |
| 1748 | while (--n >= 0) |
| 1749 | kfree(new_interfaces[n]); |
| 1750 | kfree(new_interfaces); |
| 1751 | return ret; |
| 1752 | } |
| 1753 | } |
Alan Stern | 6ad0712 | 2006-06-01 13:59:16 -0400 | [diff] [blame] | 1754 | |
| 1755 | i = dev->bus_mA - cp->desc.bMaxPower * 2; |
| 1756 | if (i < 0) |
| 1757 | dev_warn(&dev->dev, "new config #%d exceeds power " |
| 1758 | "limit by %dmA\n", |
| 1759 | configuration, -i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1760 | } |
| 1761 | |
Alan Stern | 01d883d | 2006-08-30 15:47:18 -0400 | [diff] [blame] | 1762 | /* Wake up the device so we can send it the Set-Config request */ |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 1763 | ret = usb_autoresume_device(dev); |
Alan Stern | 01d883d | 2006-08-30 15:47:18 -0400 | [diff] [blame] | 1764 | if (ret) |
| 1765 | goto free_interfaces; |
| 1766 | |
Sarah Sharp | 79abb1a | 2009-04-27 19:58:26 -0700 | [diff] [blame] | 1767 | /* Make sure we have bandwidth (and available HCD resources) for this |
| 1768 | * configuration. Remove endpoints from the schedule if we're dropping |
| 1769 | * this configuration to set configuration 0. After this point, the |
| 1770 | * host controller will not allow submissions to dropped endpoints. If |
| 1771 | * this call fails, the device state is unchanged. |
| 1772 | */ |
Sarah Sharp | 3f0479e | 2009-12-03 09:44:36 -0800 | [diff] [blame] | 1773 | mutex_lock(&hcd->bandwidth_mutex); |
| 1774 | ret = usb_hcd_alloc_bandwidth(dev, cp, NULL, NULL); |
Sarah Sharp | 79abb1a | 2009-04-27 19:58:26 -0700 | [diff] [blame] | 1775 | if (ret < 0) { |
| 1776 | usb_autosuspend_device(dev); |
Sarah Sharp | 3f0479e | 2009-12-03 09:44:36 -0800 | [diff] [blame] | 1777 | mutex_unlock(&hcd->bandwidth_mutex); |
Sarah Sharp | 79abb1a | 2009-04-27 19:58:26 -0700 | [diff] [blame] | 1778 | goto free_interfaces; |
| 1779 | } |
| 1780 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1781 | /* if it's already configured, clear out old state first. |
| 1782 | * getting rid of old interfaces means unbinding their drivers. |
| 1783 | */ |
| 1784 | if (dev->state != USB_STATE_ADDRESS) |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 1785 | usb_disable_device(dev, 1); /* Skip ep0 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1786 | |
Alan Stern | df71896 | 2008-12-19 10:27:56 -0500 | [diff] [blame] | 1787 | /* Get rid of pending async Set-Config requests for this device */ |
| 1788 | cancel_async_set_config(dev); |
| 1789 | |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 1790 | ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), |
| 1791 | USB_REQ_SET_CONFIGURATION, 0, configuration, 0, |
| 1792 | NULL, 0, USB_CTRL_SET_TIMEOUT); |
| 1793 | if (ret < 0) { |
Alan Stern | 6ad0712 | 2006-06-01 13:59:16 -0400 | [diff] [blame] | 1794 | /* All the old state is gone, so what else can we do? |
| 1795 | * The device is probably useless now anyway. |
| 1796 | */ |
| 1797 | cp = NULL; |
| 1798 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1799 | |
| 1800 | dev->actconfig = cp; |
Alan Stern | 6ad0712 | 2006-06-01 13:59:16 -0400 | [diff] [blame] | 1801 | if (!cp) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1802 | usb_set_device_state(dev, USB_STATE_ADDRESS); |
Sarah Sharp | 3f0479e | 2009-12-03 09:44:36 -0800 | [diff] [blame] | 1803 | usb_hcd_alloc_bandwidth(dev, NULL, NULL, NULL); |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 1804 | usb_autosuspend_device(dev); |
Sarah Sharp | 3f0479e | 2009-12-03 09:44:36 -0800 | [diff] [blame] | 1805 | mutex_unlock(&hcd->bandwidth_mutex); |
Alan Stern | 6ad0712 | 2006-06-01 13:59:16 -0400 | [diff] [blame] | 1806 | goto free_interfaces; |
| 1807 | } |
Sarah Sharp | 3f0479e | 2009-12-03 09:44:36 -0800 | [diff] [blame] | 1808 | mutex_unlock(&hcd->bandwidth_mutex); |
Alan Stern | 6ad0712 | 2006-06-01 13:59:16 -0400 | [diff] [blame] | 1809 | usb_set_device_state(dev, USB_STATE_CONFIGURED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1810 | |
Alan Stern | 6ad0712 | 2006-06-01 13:59:16 -0400 | [diff] [blame] | 1811 | /* Initialize the new interface structures and the |
| 1812 | * hc/hcd/usbcore interface/endpoint state. |
| 1813 | */ |
| 1814 | for (i = 0; i < nintf; ++i) { |
| 1815 | struct usb_interface_cache *intfc; |
| 1816 | struct usb_interface *intf; |
| 1817 | struct usb_host_interface *alt; |
| 1818 | |
| 1819 | cp->interface[i] = intf = new_interfaces[i]; |
| 1820 | intfc = cp->intf_cache[i]; |
| 1821 | intf->altsetting = intfc->altsetting; |
| 1822 | intf->num_altsetting = intfc->num_altsetting; |
Craig W. Nadler | 165fe97 | 2007-06-15 23:14:35 -0400 | [diff] [blame] | 1823 | intf->intf_assoc = find_iad(dev, cp, i); |
Alan Stern | 6ad0712 | 2006-06-01 13:59:16 -0400 | [diff] [blame] | 1824 | kref_get(&intfc->ref); |
| 1825 | |
| 1826 | alt = usb_altnum_to_altsetting(intf, 0); |
| 1827 | |
| 1828 | /* No altsetting 0? We'll assume the first altsetting. |
| 1829 | * We could use a GetInterface call, but if a device is |
| 1830 | * so non-compliant that it doesn't have altsetting 0 |
| 1831 | * then I wouldn't trust its reply anyway. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1832 | */ |
Alan Stern | 6ad0712 | 2006-06-01 13:59:16 -0400 | [diff] [blame] | 1833 | if (!alt) |
| 1834 | alt = &intf->altsetting[0]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1835 | |
Alan Stern | 6ad0712 | 2006-06-01 13:59:16 -0400 | [diff] [blame] | 1836 | intf->cur_altsetting = alt; |
Alan Stern | 2caf7fc | 2008-12-31 11:31:33 -0500 | [diff] [blame] | 1837 | usb_enable_interface(dev, intf, true); |
Alan Stern | 6ad0712 | 2006-06-01 13:59:16 -0400 | [diff] [blame] | 1838 | intf->dev.parent = &dev->dev; |
| 1839 | intf->dev.driver = NULL; |
| 1840 | intf->dev.bus = &usb_bus_type; |
Kay Sievers | 9f8b17e | 2007-03-13 15:59:31 +0100 | [diff] [blame] | 1841 | intf->dev.type = &usb_if_device_type; |
Alan Stern | 2e5f10e | 2008-04-30 15:37:19 -0400 | [diff] [blame] | 1842 | intf->dev.groups = usb_interface_groups; |
Alan Stern | 6ad0712 | 2006-06-01 13:59:16 -0400 | [diff] [blame] | 1843 | intf->dev.dma_mask = dev->dev.dma_mask; |
Inaky Perez-Gonzalez | dc023dc | 2008-11-13 10:31:35 -0800 | [diff] [blame] | 1844 | INIT_WORK(&intf->reset_ws, __usb_queue_reset_device); |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 1845 | device_initialize(&intf->dev); |
Alan Stern | 6ad0712 | 2006-06-01 13:59:16 -0400 | [diff] [blame] | 1846 | mark_quiesced(intf); |
Kay Sievers | 0031a06 | 2008-05-02 06:02:41 +0200 | [diff] [blame] | 1847 | dev_set_name(&intf->dev, "%d-%s:%d.%d", |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 1848 | dev->bus->busnum, dev->devpath, |
| 1849 | configuration, alt->desc.bInterfaceNumber); |
Alan Stern | 6ad0712 | 2006-06-01 13:59:16 -0400 | [diff] [blame] | 1850 | } |
| 1851 | kfree(new_interfaces); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1852 | |
Alan Stern | 1662e3a | 2009-03-18 14:28:53 -0400 | [diff] [blame] | 1853 | if (cp->string == NULL && |
| 1854 | !(dev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS)) |
Alan Stern | 6ad0712 | 2006-06-01 13:59:16 -0400 | [diff] [blame] | 1855 | cp->string = usb_cache_string(dev, cp->desc.iConfiguration); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1856 | |
Alan Stern | 6ad0712 | 2006-06-01 13:59:16 -0400 | [diff] [blame] | 1857 | /* Now that all the interfaces are set up, register them |
| 1858 | * to trigger binding of drivers to interfaces. probe() |
| 1859 | * routines may install different altsettings and may |
| 1860 | * claim() any interfaces not yet bound. Many class drivers |
| 1861 | * need that: CDC, audio, video, etc. |
| 1862 | */ |
| 1863 | for (i = 0; i < nintf; ++i) { |
| 1864 | struct usb_interface *intf = cp->interface[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1865 | |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 1866 | dev_dbg(&dev->dev, |
Alan Stern | 6ad0712 | 2006-06-01 13:59:16 -0400 | [diff] [blame] | 1867 | "adding %s (config #%d, interface %d)\n", |
Kay Sievers | 7071a3c | 2008-05-02 06:02:41 +0200 | [diff] [blame] | 1868 | dev_name(&intf->dev), configuration, |
Alan Stern | 6ad0712 | 2006-06-01 13:59:16 -0400 | [diff] [blame] | 1869 | intf->cur_altsetting->desc.bInterfaceNumber); |
Greg Kroah-Hartman | 3e35bf3 | 2008-01-30 15:21:33 -0800 | [diff] [blame] | 1870 | ret = device_add(&intf->dev); |
Alan Stern | 6ad0712 | 2006-06-01 13:59:16 -0400 | [diff] [blame] | 1871 | if (ret != 0) { |
| 1872 | dev_err(&dev->dev, "device_add(%s) --> %d\n", |
Kay Sievers | 7071a3c | 2008-05-02 06:02:41 +0200 | [diff] [blame] | 1873 | dev_name(&intf->dev), ret); |
Alan Stern | 6ad0712 | 2006-06-01 13:59:16 -0400 | [diff] [blame] | 1874 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1875 | } |
Alan Stern | 3b23dd6 | 2008-12-05 14:10:34 -0500 | [diff] [blame] | 1876 | create_intf_ep_devs(intf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1877 | } |
| 1878 | |
Alan Stern | 94fcda1 | 2006-11-20 11:38:46 -0500 | [diff] [blame] | 1879 | usb_autosuspend_device(dev); |
Alan Stern | 86d3074 | 2005-07-29 12:17:16 -0700 | [diff] [blame] | 1880 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1881 | } |
| 1882 | |
Alan Stern | df71896 | 2008-12-19 10:27:56 -0500 | [diff] [blame] | 1883 | static LIST_HEAD(set_config_list); |
| 1884 | static DEFINE_SPINLOCK(set_config_lock); |
| 1885 | |
Alan Stern | 088dc27 | 2006-08-21 12:08:19 -0400 | [diff] [blame] | 1886 | struct set_config_request { |
| 1887 | struct usb_device *udev; |
| 1888 | int config; |
| 1889 | struct work_struct work; |
Alan Stern | df71896 | 2008-12-19 10:27:56 -0500 | [diff] [blame] | 1890 | struct list_head node; |
Alan Stern | 088dc27 | 2006-08-21 12:08:19 -0400 | [diff] [blame] | 1891 | }; |
| 1892 | |
| 1893 | /* Worker routine for usb_driver_set_configuration() */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1894 | static void driver_set_config_work(struct work_struct *work) |
Alan Stern | 088dc27 | 2006-08-21 12:08:19 -0400 | [diff] [blame] | 1895 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1896 | struct set_config_request *req = |
| 1897 | container_of(work, struct set_config_request, work); |
Alan Stern | df71896 | 2008-12-19 10:27:56 -0500 | [diff] [blame] | 1898 | struct usb_device *udev = req->udev; |
Alan Stern | 088dc27 | 2006-08-21 12:08:19 -0400 | [diff] [blame] | 1899 | |
Alan Stern | df71896 | 2008-12-19 10:27:56 -0500 | [diff] [blame] | 1900 | usb_lock_device(udev); |
| 1901 | spin_lock(&set_config_lock); |
| 1902 | list_del(&req->node); |
| 1903 | spin_unlock(&set_config_lock); |
| 1904 | |
| 1905 | if (req->config >= -1) /* Is req still valid? */ |
| 1906 | usb_set_configuration(udev, req->config); |
| 1907 | usb_unlock_device(udev); |
| 1908 | usb_put_dev(udev); |
Alan Stern | 088dc27 | 2006-08-21 12:08:19 -0400 | [diff] [blame] | 1909 | kfree(req); |
| 1910 | } |
| 1911 | |
Alan Stern | df71896 | 2008-12-19 10:27:56 -0500 | [diff] [blame] | 1912 | /* Cancel pending Set-Config requests for a device whose configuration |
| 1913 | * was just changed |
| 1914 | */ |
| 1915 | static void cancel_async_set_config(struct usb_device *udev) |
| 1916 | { |
| 1917 | struct set_config_request *req; |
| 1918 | |
| 1919 | spin_lock(&set_config_lock); |
| 1920 | list_for_each_entry(req, &set_config_list, node) { |
| 1921 | if (req->udev == udev) |
| 1922 | req->config = -999; /* Mark as cancelled */ |
| 1923 | } |
| 1924 | spin_unlock(&set_config_lock); |
| 1925 | } |
| 1926 | |
Alan Stern | 088dc27 | 2006-08-21 12:08:19 -0400 | [diff] [blame] | 1927 | /** |
| 1928 | * usb_driver_set_configuration - Provide a way for drivers to change device configurations |
| 1929 | * @udev: the device whose configuration is being updated |
| 1930 | * @config: the configuration being chosen. |
| 1931 | * Context: In process context, must be able to sleep |
| 1932 | * |
| 1933 | * Device interface drivers are not allowed to change device configurations. |
| 1934 | * This is because changing configurations will destroy the interface the |
| 1935 | * driver is bound to and create new ones; it would be like a floppy-disk |
| 1936 | * driver telling the computer to replace the floppy-disk drive with a |
| 1937 | * tape drive! |
| 1938 | * |
| 1939 | * Still, in certain specialized circumstances the need may arise. This |
| 1940 | * routine gets around the normal restrictions by using a work thread to |
| 1941 | * submit the change-config request. |
| 1942 | * |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 1943 | * Returns 0 if the request was successfully queued, error code otherwise. |
Alan Stern | 088dc27 | 2006-08-21 12:08:19 -0400 | [diff] [blame] | 1944 | * The caller has no way to know whether the queued request will eventually |
| 1945 | * succeed. |
| 1946 | */ |
| 1947 | int usb_driver_set_configuration(struct usb_device *udev, int config) |
| 1948 | { |
| 1949 | struct set_config_request *req; |
| 1950 | |
| 1951 | req = kmalloc(sizeof(*req), GFP_KERNEL); |
| 1952 | if (!req) |
| 1953 | return -ENOMEM; |
| 1954 | req->udev = udev; |
| 1955 | req->config = config; |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1956 | INIT_WORK(&req->work, driver_set_config_work); |
Alan Stern | 088dc27 | 2006-08-21 12:08:19 -0400 | [diff] [blame] | 1957 | |
Alan Stern | df71896 | 2008-12-19 10:27:56 -0500 | [diff] [blame] | 1958 | spin_lock(&set_config_lock); |
| 1959 | list_add(&req->node, &set_config_list); |
| 1960 | spin_unlock(&set_config_lock); |
| 1961 | |
Alan Stern | 088dc27 | 2006-08-21 12:08:19 -0400 | [diff] [blame] | 1962 | usb_get_dev(udev); |
Alan Stern | 1737bf2 | 2006-12-15 16:04:52 -0500 | [diff] [blame] | 1963 | schedule_work(&req->work); |
Alan Stern | 088dc27 | 2006-08-21 12:08:19 -0400 | [diff] [blame] | 1964 | return 0; |
| 1965 | } |
| 1966 | EXPORT_SYMBOL_GPL(usb_driver_set_configuration); |