| /* |
| * message.c - synchronous message handling |
| */ |
| |
| #include <linux/pci.h> /* for scatterlist macros */ |
| #include <linux/usb.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/init.h> |
| #include <linux/mm.h> |
| #include <linux/timer.h> |
| #include <linux/ctype.h> |
| #include <linux/nls.h> |
| #include <linux/device.h> |
| #include <linux/scatterlist.h> |
| #include <linux/usb/quirks.h> |
| #include <linux/usb/hcd.h> /* for usbcore internals */ |
| #include <asm/byteorder.h> |
| |
| #include "usb.h" |
| |
| static void cancel_async_set_config(struct usb_device *udev); |
| |
| struct api_context { |
| struct completion done; |
| int status; |
| }; |
| |
| static void usb_api_blocking_completion(struct urb *urb) |
| { |
| struct api_context *ctx = urb->context; |
| |
| ctx->status = urb->status; |
| complete(&ctx->done); |
| } |
| |
| |
| /* |
| * Starts urb and waits for completion or timeout. Note that this call |
| * is NOT interruptible. Many device driver i/o requests should be |
| * interruptible and therefore these drivers should implement their |
| * own interruptible routines. |
| */ |
| static int usb_start_wait_urb(struct urb *urb, int timeout, int *actual_length) |
| { |
| struct api_context ctx; |
| unsigned long expire; |
| int retval; |
| |
| init_completion(&ctx.done); |
| urb->context = &ctx; |
| urb->actual_length = 0; |
| retval = usb_submit_urb(urb, GFP_NOIO); |
| if (unlikely(retval)) |
| goto out; |
| |
| expire = timeout ? msecs_to_jiffies(timeout) : MAX_SCHEDULE_TIMEOUT; |
| if (!wait_for_completion_timeout(&ctx.done, expire)) { |
| usb_kill_urb(urb); |
| retval = (ctx.status == -ENOENT ? -ETIMEDOUT : ctx.status); |
| |
| dev_dbg(&urb->dev->dev, |
| "%s timed out on ep%d%s len=%u/%u\n", |
| current->comm, |
| usb_endpoint_num(&urb->ep->desc), |
| usb_urb_dir_in(urb) ? "in" : "out", |
| urb->actual_length, |
| urb->transfer_buffer_length); |
| } else |
| retval = ctx.status; |
| out: |
| if (actual_length) |
| *actual_length = urb->actual_length; |
| |
| usb_free_urb(urb); |
| return retval; |
| } |
| |
| /*-------------------------------------------------------------------*/ |
| /* returns status (negative) or length (positive) */ |
| static int usb_internal_control_msg(struct usb_device *usb_dev, |
| unsigned int pipe, |
| struct usb_ctrlrequest *cmd, |
| void *data, int len, int timeout) |
| { |
| struct urb *urb; |
| int retv; |
| int length; |
| |
| urb = usb_alloc_urb(0, GFP_NOIO); |
| if (!urb) |
| return -ENOMEM; |
| |
| usb_fill_control_urb(urb, usb_dev, pipe, (unsigned char *)cmd, data, |
| len, usb_api_blocking_completion, NULL); |
| |
| retv = usb_start_wait_urb(urb, timeout, &length); |
| if (retv < 0) |
| return retv; |
| else |
| return length; |
| } |
| |
| /** |
| * usb_control_msg - Builds a control urb, sends it off and waits for completion |
| * @dev: pointer to the usb device to send the message to |
| * @pipe: endpoint "pipe" to send the message to |
| * @request: USB message request value |
| * @requesttype: USB message request type value |
| * @value: USB message value |
| * @index: USB message index value |
| * @data: pointer to the data to send |
| * @size: length in bytes of the data to send |
| * @timeout: time in msecs to wait for the message to complete before timing |
| * out (if 0 the wait is forever) |
| * |
| * Context: !in_interrupt () |
| * |
| * This function sends a simple control message to a specified endpoint and |
| * waits for the message to complete, or timeout. |
| * |
| * If successful, it returns the number of bytes transferred, otherwise a |
| * negative error number. |
| * |
| * Don't use this function from within an interrupt context, like a bottom half |
| * handler. If you need an asynchronous message, or need to send a message |
| * from within interrupt context, use usb_submit_urb(). |
| * If a thread in your driver uses this call, make sure your disconnect() |
| * method can wait for it to complete. Since you don't have a handle on the |
| * URB used, you can't cancel the request. |
| */ |
| int usb_control_msg(struct usb_device *dev, unsigned int pipe, __u8 request, |
| __u8 requesttype, __u16 value, __u16 index, void *data, |
| __u16 size, int timeout) |
| { |
| struct usb_ctrlrequest *dr; |
| int ret; |
| |
| dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO); |
| if (!dr) |
| return -ENOMEM; |
| |
| dr->bRequestType = requesttype; |
| dr->bRequest = request; |
| dr->wValue = cpu_to_le16(value); |
| dr->wIndex = cpu_to_le16(index); |
| dr->wLength = cpu_to_le16(size); |
| |
| ret = usb_internal_control_msg(dev, pipe, dr, data, size, timeout); |
| |
| kfree(dr); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(usb_control_msg); |
| |
| /** |
| * usb_interrupt_msg - Builds an interrupt urb, sends it off and waits for completion |
| * @usb_dev: pointer to the usb device to send the message to |
| * @pipe: endpoint "pipe" to send the message to |
| * @data: pointer to the data to send |
| * @len: length in bytes of the data to send |
| * @actual_length: pointer to a location to put the actual length transferred |
| * in bytes |
| * @timeout: time in msecs to wait for the message to complete before |
| * timing out (if 0 the wait is forever) |
| * |
| * Context: !in_interrupt () |
| * |
| * This function sends a simple interrupt message to a specified endpoint and |
| * waits for the message to complete, or timeout. |
| * |
| * If successful, it returns 0, otherwise a negative error number. The number |
| * of actual bytes transferred will be stored in the actual_length paramater. |
| * |
| * Don't use this function from within an interrupt context, like a bottom half |
| * handler. If you need an asynchronous message, or need to send a message |
| * from within interrupt context, use usb_submit_urb() If a thread in your |
| * driver uses this call, make sure your disconnect() method can wait for it to |
| * complete. Since you don't have a handle on the URB used, you can't cancel |
| * the request. |
| */ |
| int usb_interrupt_msg(struct usb_device *usb_dev, unsigned int pipe, |
| void *data, int len, int *actual_length, int timeout) |
| { |
| return usb_bulk_msg(usb_dev, pipe, data, len, actual_length, timeout); |
| } |
| EXPORT_SYMBOL_GPL(usb_interrupt_msg); |
| |
| /** |
| * usb_bulk_msg - Builds a bulk urb, sends it off and waits for completion |
| * @usb_dev: pointer to the usb device to send the message to |
| * @pipe: endpoint "pipe" to send the message to |
| * @data: pointer to the data to send |
| * @len: length in bytes of the data to send |
| * @actual_length: pointer to a location to put the actual length transferred |
| * in bytes |
| * @timeout: time in msecs to wait for the message to complete before |
| * timing out (if 0 the wait is forever) |
| * |
| * Context: !in_interrupt () |
| * |
| * This function sends a simple bulk message to a specified endpoint |
| * and waits for the message to complete, or timeout. |
| * |
| * If successful, it returns 0, otherwise a negative error number. The number |
| * of actual bytes transferred will be stored in the actual_length paramater. |
| * |
| * Don't use this function from within an interrupt context, like a bottom half |
| * handler. If you need an asynchronous message, or need to send a message |
| * from within interrupt context, use usb_submit_urb() If a thread in your |
| * driver uses this call, make sure your disconnect() method can wait for it to |
| * complete. Since you don't have a handle on the URB used, you can't cancel |
| * the request. |
| * |
| * Because there is no usb_interrupt_msg() and no USBDEVFS_INTERRUPT ioctl, |
| * users are forced to abuse this routine by using it to submit URBs for |
| * interrupt endpoints. We will take the liberty of creating an interrupt URB |
| * (with the default interval) if the target is an interrupt endpoint. |
| */ |
| int usb_bulk_msg(struct usb_device *usb_dev, unsigned int pipe, |
| void *data, int len, int *actual_length, int timeout) |
| { |
| struct urb *urb; |
| struct usb_host_endpoint *ep; |
| |
| ep = usb_pipe_endpoint(usb_dev, pipe); |
| if (!ep || len < 0) |
| return -EINVAL; |
| |
| urb = usb_alloc_urb(0, GFP_KERNEL); |
| if (!urb) |
| return -ENOMEM; |
| |
| if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == |
| USB_ENDPOINT_XFER_INT) { |
| pipe = (pipe & ~(3 << 30)) | (PIPE_INTERRUPT << 30); |
| usb_fill_int_urb(urb, usb_dev, pipe, data, len, |
| usb_api_blocking_completion, NULL, |
| ep->desc.bInterval); |
| } else |
| usb_fill_bulk_urb(urb, usb_dev, pipe, data, len, |
| usb_api_blocking_completion, NULL); |
| |
| return usb_start_wait_urb(urb, timeout, actual_length); |
| } |
| EXPORT_SYMBOL_GPL(usb_bulk_msg); |
| |
| /*-------------------------------------------------------------------*/ |
| |
| static void sg_clean(struct usb_sg_request *io) |
| { |
| if (io->urbs) { |
| while (io->entries--) |
| usb_free_urb(io->urbs [io->entries]); |
| kfree(io->urbs); |
| io->urbs = NULL; |
| } |
| io->dev = NULL; |
| } |
| |
| static void sg_complete(struct urb *urb) |
| { |
| struct usb_sg_request *io = urb->context; |
| int status = urb->status; |
| |
| spin_lock(&io->lock); |
| |
| /* In 2.5 we require hcds' endpoint queues not to progress after fault |
| * reports, until the completion callback (this!) returns. That lets |
| * device driver code (like this routine) unlink queued urbs first, |
| * if it needs to, since the HC won't work on them at all. So it's |
| * not possible for page N+1 to overwrite page N, and so on. |
| * |
| * That's only for "hard" faults; "soft" faults (unlinks) sometimes |
| * complete before the HCD can get requests away from hardware, |
| * though never during cleanup after a hard fault. |
| */ |
| if (io->status |
| && (io->status != -ECONNRESET |
| || status != -ECONNRESET) |
| && urb->actual_length) { |
| dev_err(io->dev->bus->controller, |
| "dev %s ep%d%s scatterlist error %d/%d\n", |
| io->dev->devpath, |
| usb_endpoint_num(&urb->ep->desc), |
| usb_urb_dir_in(urb) ? "in" : "out", |
| status, io->status); |
| /* BUG (); */ |
| } |
| |
| if (io->status == 0 && status && status != -ECONNRESET) { |
| int i, found, retval; |
| |
| io->status = status; |
| |
| /* the previous urbs, and this one, completed already. |
| * unlink pending urbs so they won't rx/tx bad data. |
| * careful: unlink can sometimes be synchronous... |
| */ |
| spin_unlock(&io->lock); |
| for (i = 0, found = 0; i < io->entries; i++) { |
| if (!io->urbs [i] || !io->urbs [i]->dev) |
| continue; |
| if (found) { |
| retval = usb_unlink_urb(io->urbs [i]); |
| if (retval != -EINPROGRESS && |
| retval != -ENODEV && |
| retval != -EBUSY && |
| retval != -EIDRM) |
| dev_err(&io->dev->dev, |
| "%s, unlink --> %d\n", |
| __func__, retval); |
| } else if (urb == io->urbs [i]) |
| found = 1; |
| } |
| spin_lock(&io->lock); |
| } |
| |
| /* on the last completion, signal usb_sg_wait() */ |
| io->bytes += urb->actual_length; |
| io->count--; |
| if (!io->count) |
| complete(&io->complete); |
| |
| spin_unlock(&io->lock); |
| } |
| |
| |
| /** |
| * usb_sg_init - initializes scatterlist-based bulk/interrupt I/O request |
| * @io: request block being initialized. until usb_sg_wait() returns, |
| * treat this as a pointer to an opaque block of memory, |
| * @dev: the usb device that will send or receive the data |
| * @pipe: endpoint "pipe" used to transfer the data |
| * @period: polling rate for interrupt endpoints, in frames or |
| * (for high speed endpoints) microframes; ignored for bulk |
| * @sg: scatterlist entries |
| * @nents: how many entries in the scatterlist |
| * @length: how many bytes to send from the scatterlist, or zero to |
| * send every byte identified in the list. |
| * @mem_flags: SLAB_* flags affecting memory allocations in this call |
| * |
| * Returns zero for success, else a negative errno value. This initializes a |
| * scatter/gather request, allocating resources such as I/O mappings and urb |
| * memory (except maybe memory used by USB controller drivers). |
| * |
| * The request must be issued using usb_sg_wait(), which waits for the I/O to |
| * complete (or to be canceled) and then cleans up all resources allocated by |
| * usb_sg_init(). |
| * |
| * The request may be canceled with usb_sg_cancel(), either before or after |
| * usb_sg_wait() is called. |
| */ |
| int usb_sg_init(struct usb_sg_request *io, struct usb_device *dev, |
| unsigned pipe, unsigned period, struct scatterlist *sg, |
| int nents, size_t length, gfp_t mem_flags) |
| { |
| int i; |
| int urb_flags; |
| int use_sg; |
| |
| if (!io || !dev || !sg |
| || usb_pipecontrol(pipe) |
| || usb_pipeisoc(pipe) |
| || nents <= 0) |
| return -EINVAL; |
| |
| spin_lock_init(&io->lock); |
| io->dev = dev; |
| io->pipe = pipe; |
| |
| if (dev->bus->sg_tablesize > 0) { |
| use_sg = true; |
| io->entries = 1; |
| } else { |
| use_sg = false; |
| io->entries = nents; |
| } |
| |
| /* initialize all the urbs we'll use */ |
| io->urbs = kmalloc(io->entries * sizeof *io->urbs, mem_flags); |
| if (!io->urbs) |
| goto nomem; |
| |
| urb_flags = URB_NO_INTERRUPT; |
| if (usb_pipein(pipe)) |
| urb_flags |= URB_SHORT_NOT_OK; |
| |
| for_each_sg(sg, sg, io->entries, i) { |
| struct urb *urb; |
| unsigned len; |
| |
| urb = usb_alloc_urb(0, mem_flags); |
| if (!urb) { |
| io->entries = i; |
| goto nomem; |
| } |
| io->urbs[i] = urb; |
| |
| urb->dev = NULL; |
| urb->pipe = pipe; |
| urb->interval = period; |
| urb->transfer_flags = urb_flags; |
| urb->complete = sg_complete; |
| urb->context = io; |
| urb->sg = sg; |
| |
| if (use_sg) { |
| /* There is no single transfer buffer */ |
| urb->transfer_buffer = NULL; |
| urb->num_sgs = nents; |
| |
| /* A length of zero means transfer the whole sg list */ |
| len = length; |
| if (len == 0) { |
| struct scatterlist *sg2; |
| int j; |
| |
| for_each_sg(sg, sg2, nents, j) |
| len += sg2->length; |
| } |
| } else { |
| /* |
| * Some systems can't use DMA; they use PIO instead. |
| * For their sakes, transfer_buffer is set whenever |
| * possible. |
| */ |
| if (!PageHighMem(sg_page(sg))) |
| urb->transfer_buffer = sg_virt(sg); |
| else |
| urb->transfer_buffer = NULL; |
| |
| len = sg->length; |
| if (length) { |
| len = min_t(size_t, len, length); |
| length -= len; |
| if (length == 0) |
| io->entries = i + 1; |
| } |
| } |
| urb->transfer_buffer_length = len; |
| } |
| io->urbs[--i]->transfer_flags &= ~URB_NO_INTERRUPT; |
| |
| /* transaction state */ |
| io->count = io->entries; |
| io->status = 0; |
| io->bytes = 0; |
| init_completion(&io->complete); |
| return 0; |
| |
| nomem: |
| sg_clean(io); |
| return -ENOMEM; |
| } |
| EXPORT_SYMBOL_GPL(usb_sg_init); |
| |
| /** |
| * usb_sg_wait - synchronously execute scatter/gather request |
| * @io: request block handle, as initialized with usb_sg_init(). |
| * some fields become accessible when this call returns. |
| * Context: !in_interrupt () |
| * |
| * This function blocks until the specified I/O operation completes. It |
| * leverages the grouping of the related I/O requests to get good transfer |
| * rates, by queueing the requests. At higher speeds, such queuing can |
| * significantly improve USB throughput. |
| * |
| * There are three kinds of completion for this function. |
| * (1) success, where io->status is zero. The number of io->bytes |
| * transferred is as requested. |
| * (2) error, where io->status is a negative errno value. The number |
| * of io->bytes transferred before the error is usually less |
| * than requested, and can be nonzero. |
| * (3) cancellation, a type of error with status -ECONNRESET that |
| * is initiated by usb_sg_cancel(). |
| * |
| * When this function returns, all memory allocated through usb_sg_init() or |
| * this call will have been freed. The request block parameter may still be |
| * passed to usb_sg_cancel(), or it may be freed. It could also be |
| * reinitialized and then reused. |
| * |
| * Data Transfer Rates: |
| * |
| * Bulk transfers are valid for full or high speed endpoints. |
| * The best full speed data rate is 19 packets of 64 bytes each |
| * per frame, or 1216 bytes per millisecond. |
| * The best high speed data rate is 13 packets of 512 bytes each |
| * per microframe, or 52 KBytes per millisecond. |
| * |
| * The reason to use interrupt transfers through this API would most likely |
| * be to reserve high speed bandwidth, where up to 24 KBytes per millisecond |
| * could be transferred. That capability is less useful for low or full |
| * speed interrupt endpoints, which allow at most one packet per millisecond, |
| * of at most 8 or 64 bytes (respectively). |
| * |
| * It is not necessary to call this function to reserve bandwidth for devices |
| * under an xHCI host controller, as the bandwidth is reserved when the |
| * configuration or interface alt setting is selected. |
| */ |
| void usb_sg_wait(struct usb_sg_request *io) |
| { |
| int i; |
| int entries = io->entries; |
| |
| /* queue the urbs. */ |
| spin_lock_irq(&io->lock); |
| i = 0; |
| while (i < entries && !io->status) { |
| int retval; |
| |
| io->urbs[i]->dev = io->dev; |
| retval = usb_submit_urb(io->urbs [i], GFP_ATOMIC); |
| |
| /* after we submit, let completions or cancelations fire; |
| * we handshake using io->status. |
| */ |
| spin_unlock_irq(&io->lock); |
| switch (retval) { |
| /* maybe we retrying will recover */ |
| case -ENXIO: /* hc didn't queue this one */ |
| case -EAGAIN: |
| case -ENOMEM: |
| retval = 0; |
| yield(); |
| break; |
| |
| /* no error? continue immediately. |
| * |
| * NOTE: to work better with UHCI (4K I/O buffer may |
| * need 3K of TDs) it may be good to limit how many |
| * URBs are queued at once; N milliseconds? |
| */ |
| case 0: |
| ++i; |
| cpu_relax(); |
| break; |
| |
| /* fail any uncompleted urbs */ |
| default: |
| io->urbs[i]->status = retval; |
| dev_dbg(&io->dev->dev, "%s, submit --> %d\n", |
| __func__, retval); |
| usb_sg_cancel(io); |
| } |
| spin_lock_irq(&io->lock); |
| if (retval && (io->status == 0 || io->status == -ECONNRESET)) |
| io->status = retval; |
| } |
| io->count -= entries - i; |
| if (io->count == 0) |
| complete(&io->complete); |
| spin_unlock_irq(&io->lock); |
| |
| /* OK, yes, this could be packaged as non-blocking. |
| * So could the submit loop above ... but it's easier to |
| * solve neither problem than to solve both! |
| */ |
| wait_for_completion(&io->complete); |
| |
| sg_clean(io); |
| } |
| EXPORT_SYMBOL_GPL(usb_sg_wait); |
| |
| /** |
| * usb_sg_cancel - stop scatter/gather i/o issued by usb_sg_wait() |
| * @io: request block, initialized with usb_sg_init() |
| * |
| * This stops a request after it has been started by usb_sg_wait(). |
| * It can also prevents one initialized by usb_sg_init() from starting, |
| * so that call just frees resources allocated to the request. |
| */ |
| void usb_sg_cancel(struct usb_sg_request *io) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&io->lock, flags); |
| |
| /* shut everything down, if it didn't already */ |
| if (!io->status) { |
| int i; |
| |
| io->status = -ECONNRESET; |
| spin_unlock(&io->lock); |
| for (i = 0; i < io->entries; i++) { |
| int retval; |
| |
| if (!io->urbs [i]->dev) |
| continue; |
| retval = usb_unlink_urb(io->urbs [i]); |
| if (retval != -EINPROGRESS |
| && retval != -ENODEV |
| && retval != -EBUSY |
| && retval != -EIDRM) |
| dev_warn(&io->dev->dev, "%s, unlink --> %d\n", |
| __func__, retval); |
| } |
| spin_lock(&io->lock); |
| } |
| spin_unlock_irqrestore(&io->lock, flags); |
| } |
| EXPORT_SYMBOL_GPL(usb_sg_cancel); |
| |
| /*-------------------------------------------------------------------*/ |
| |
| /** |
| * usb_get_descriptor - issues a generic GET_DESCRIPTOR request |
| * @dev: the device whose descriptor is being retrieved |
| * @type: the descriptor type (USB_DT_*) |
| * @index: the number of the descriptor |
| * @buf: where to put the descriptor |
| * @size: how big is "buf"? |
| * Context: !in_interrupt () |
| * |
| * Gets a USB descriptor. Convenience functions exist to simplify |
| * getting some types of descriptors. Use |
| * usb_get_string() or usb_string() for USB_DT_STRING. |
| * Device (USB_DT_DEVICE) and configuration descriptors (USB_DT_CONFIG) |
| * are part of the device structure. |
| * In addition to a number of USB-standard descriptors, some |
| * devices also use class-specific or vendor-specific descriptors. |
| * |
| * This call is synchronous, and may not be used in an interrupt context. |
| * |
| * Returns the number of bytes received on success, or else the status code |
| * returned by the underlying usb_control_msg() call. |
| */ |
| int usb_get_descriptor(struct usb_device *dev, unsigned char type, |
| unsigned char index, void *buf, int size) |
| { |
| int i; |
| int result; |
| |
| memset(buf, 0, size); /* Make sure we parse really received data */ |
| |
| for (i = 0; i < 3; ++i) { |
| /* retry on length 0 or error; some devices are flakey */ |
| result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), |
| USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, |
| (type << 8) + index, 0, buf, size, |
| USB_CTRL_GET_TIMEOUT); |
| if (result <= 0 && result != -ETIMEDOUT) |
| continue; |
| if (result > 1 && ((u8 *)buf)[1] != type) { |
| result = -ENODATA; |
| continue; |
| } |
| break; |
| } |
| return result; |
| } |
| EXPORT_SYMBOL_GPL(usb_get_descriptor); |
| |
| /** |
| * usb_get_string - gets a string descriptor |
| * @dev: the device whose string descriptor is being retrieved |
| * @langid: code for language chosen (from string descriptor zero) |
| * @index: the number of the descriptor |
| * @buf: where to put the string |
| * @size: how big is "buf"? |
| * Context: !in_interrupt () |
| * |
| * Retrieves a string, encoded using UTF-16LE (Unicode, 16 bits per character, |
| * in little-endian byte order). |
| * The usb_string() function will often be a convenient way to turn |
| * these strings into kernel-printable form. |
| * |
| * Strings may be referenced in device, configuration, interface, or other |
| * descriptors, and could also be used in vendor-specific ways. |
| * |
| * This call is synchronous, and may not be used in an interrupt context. |
| * |
| * Returns the number of bytes received on success, or else the status code |
| * returned by the underlying usb_control_msg() call. |
| */ |
| static int usb_get_string(struct usb_device *dev, unsigned short langid, |
| unsigned char index, void *buf, int size) |
| { |
| int i; |
| int result; |
| |
| for (i = 0; i < 3; ++i) { |
| /* retry on length 0 or stall; some devices are flakey */ |
| result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), |
| USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, |
| (USB_DT_STRING << 8) + index, langid, buf, size, |
| USB_CTRL_GET_TIMEOUT); |
| if (result == 0 || result == -EPIPE) |
| continue; |
| if (result > 1 && ((u8 *) buf)[1] != USB_DT_STRING) { |
| result = -ENODATA; |
| continue; |
| } |
| break; |
| } |
| return result; |
| } |
| |
| static void usb_try_string_workarounds(unsigned char *buf, int *length) |
| { |
| int newlength, oldlength = *length; |
| |
| for (newlength = 2; newlength + 1 < oldlength; newlength += 2) |
| if (!isprint(buf[newlength]) || buf[newlength + 1]) |
| break; |
| |
| if (newlength > 2) { |
| buf[0] = newlength; |
| *length = newlength; |
| } |
| } |
| |
| static int usb_string_sub(struct usb_device *dev, unsigned int langid, |
| unsigned int index, unsigned char *buf) |
| { |
| int rc; |
| |
| /* Try to read the string descriptor by asking for the maximum |
| * possible number of bytes */ |
| if (dev->quirks & USB_QUIRK_STRING_FETCH_255) |
| rc = -EIO; |
| else |
| rc = usb_get_string(dev, langid, index, buf, 255); |
| |
| /* If that failed try to read the descriptor length, then |
| * ask for just that many bytes */ |
| if (rc < 2) { |
| rc = usb_get_string(dev, langid, index, buf, 2); |
| if (rc == 2) |
| rc = usb_get_string(dev, langid, index, buf, buf[0]); |
| } |
| |
| if (rc >= 2) { |
| if (!buf[0] && !buf[1]) |
| usb_try_string_workarounds(buf, &rc); |
| |
| /* There might be extra junk at the end of the descriptor */ |
| if (buf[0] < rc) |
| rc = buf[0]; |
| |
| rc = rc - (rc & 1); /* force a multiple of two */ |
| } |
| |
| if (rc < 2) |
| rc = (rc < 0 ? rc : -EINVAL); |
| |
| return rc; |
| } |
| |
| static int usb_get_langid(struct usb_device *dev, unsigned char *tbuf) |
| { |
| int err; |
| |
| if (dev->have_langid) |
| return 0; |
| |
| if (dev->string_langid < 0) |
| return -EPIPE; |
| |
| err = usb_string_sub(dev, 0, 0, tbuf); |
| |
| /* If the string was reported but is malformed, default to english |
| * (0x0409) */ |
| if (err == -ENODATA || (err > 0 && err < 4)) { |
| dev->string_langid = 0x0409; |
| dev->have_langid = 1; |
| dev_err(&dev->dev, |
| "string descriptor 0 malformed (err = %d), " |
| "defaulting to 0x%04x\n", |
| err, dev->string_langid); |
| return 0; |
| } |
| |
| /* In case of all other errors, we assume the device is not able to |
| * deal with strings at all. Set string_langid to -1 in order to |
| * prevent any string to be retrieved from the device */ |
| if (err < 0) { |
| dev_err(&dev->dev, "string descriptor 0 read error: %d\n", |
| err); |
| dev->string_langid = -1; |
| return -EPIPE; |
| } |
| |
| /* always use the first langid listed */ |
| dev->string_langid = tbuf[2] | (tbuf[3] << 8); |
| dev->have_langid = 1; |
| dev_dbg(&dev->dev, "default language 0x%04x\n", |
| dev->string_langid); |
| return 0; |
| } |
| |
| /** |
| * usb_string - returns UTF-8 version of a string descriptor |
| * @dev: the device whose string descriptor is being retrieved |
| * @index: the number of the descriptor |
| * @buf: where to put the string |
| * @size: how big is "buf"? |
| * Context: !in_interrupt () |
| * |
| * This converts the UTF-16LE encoded strings returned by devices, from |
| * usb_get_string_descriptor(), to null-terminated UTF-8 encoded ones |
| * that are more usable in most kernel contexts. Note that this function |
| * chooses strings in the first language supported by the device. |
| * |
| * This call is synchronous, and may not be used in an interrupt context. |
| * |
| * Returns length of the string (>= 0) or usb_control_msg status (< 0). |
| */ |
| int usb_string(struct usb_device *dev, int index, char *buf, size_t size) |
| { |
| unsigned char *tbuf; |
| int err; |
| |
| if (dev->state == USB_STATE_SUSPENDED) |
| return -EHOSTUNREACH; |
| if (size <= 0 || !buf || !index) |
| return -EINVAL; |
| buf[0] = 0; |
| tbuf = kmalloc(256, GFP_NOIO); |
| if (!tbuf) |
| return -ENOMEM; |
| |
| err = usb_get_langid(dev, tbuf); |
| if (err < 0) |
| goto errout; |
| |
| err = usb_string_sub(dev, dev->string_langid, index, tbuf); |
| if (err < 0) |
| goto errout; |
| |
| size--; /* leave room for trailing NULL char in output buffer */ |
| err = utf16s_to_utf8s((wchar_t *) &tbuf[2], (err - 2) / 2, |
| UTF16_LITTLE_ENDIAN, buf, size); |
| buf[err] = 0; |
| |
| if (tbuf[1] != USB_DT_STRING) |
| dev_dbg(&dev->dev, |
| "wrong descriptor type %02x for string %d (\"%s\")\n", |
| tbuf[1], index, buf); |
| |
| errout: |
| kfree(tbuf); |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(usb_string); |
| |
| /* one UTF-8-encoded 16-bit character has at most three bytes */ |
| #define MAX_USB_STRING_SIZE (127 * 3 + 1) |
| |
| /** |
| * usb_cache_string - read a string descriptor and cache it for later use |
| * @udev: the device whose string descriptor is being read |
| * @index: the descriptor index |
| * |
| * Returns a pointer to a kmalloc'ed buffer containing the descriptor string, |
| * or NULL if the index is 0 or the string could not be read. |
| */ |
| char *usb_cache_string(struct usb_device *udev, int index) |
| { |
| char *buf; |
| char *smallbuf = NULL; |
| int len; |
| |
| if (index <= 0) |
| return NULL; |
| |
| buf = kmalloc(MAX_USB_STRING_SIZE, GFP_NOIO); |
| if (buf) { |
| len = usb_string(udev, index, buf, MAX_USB_STRING_SIZE); |
| if (len > 0) { |
| smallbuf = kmalloc(++len, GFP_NOIO); |
| if (!smallbuf) |
| return buf; |
| memcpy(smallbuf, buf, len); |
| } |
| kfree(buf); |
| } |
| return smallbuf; |
| } |
| |
| /* |
| * usb_get_device_descriptor - (re)reads the device descriptor (usbcore) |
| * @dev: the device whose device descriptor is being updated |
| * @size: how much of the descriptor to read |
| * Context: !in_interrupt () |
| * |
| * Updates the copy of the device descriptor stored in the device structure, |
| * which dedicates space for this purpose. |
| * |
| * Not exported, only for use by the core. If drivers really want to read |
| * the device descriptor directly, they can call usb_get_descriptor() with |
| * type = USB_DT_DEVICE and index = 0. |
| * |
| * This call is synchronous, and may not be used in an interrupt context. |
| * |
| * Returns the number of bytes received on success, or else the status code |
| * returned by the underlying usb_control_msg() call. |
| */ |
| int usb_get_device_descriptor(struct usb_device *dev, unsigned int size) |
| { |
| struct usb_device_descriptor *desc; |
| int ret; |
| |
| if (size > sizeof(*desc)) |
| return -EINVAL; |
| desc = kmalloc(sizeof(*desc), GFP_NOIO); |
| if (!desc) |
| return -ENOMEM; |
| |
| ret = usb_get_descriptor(dev, USB_DT_DEVICE, 0, desc, size); |
| if (ret >= 0) |
| memcpy(&dev->descriptor, desc, size); |
| kfree(desc); |
| return ret; |
| } |
| |
| /** |
| * usb_get_status - issues a GET_STATUS call |
| * @dev: the device whose status is being checked |
| * @type: USB_RECIP_*; for device, interface, or endpoint |
| * @target: zero (for device), else interface or endpoint number |
| * @data: pointer to two bytes of bitmap data |
| * Context: !in_interrupt () |
| * |
| * Returns device, interface, or endpoint status. Normally only of |
| * interest to see if the device is self powered, or has enabled the |
| * remote wakeup facility; or whether a bulk or interrupt endpoint |
| * is halted ("stalled"). |
| * |
| * Bits in these status bitmaps are set using the SET_FEATURE request, |
| * and cleared using the CLEAR_FEATURE request. The usb_clear_halt() |
| * function should be used to clear halt ("stall") status. |
| * |
| * This call is synchronous, and may not be used in an interrupt context. |
| * |
| * Returns the number of bytes received on success, or else the status code |
| * returned by the underlying usb_control_msg() call. |
| */ |
| int usb_get_status(struct usb_device *dev, int type, int target, void *data) |
| { |
| int ret; |
| u16 *status = kmalloc(sizeof(*status), GFP_KERNEL); |
| |
| if (!status) |
| return -ENOMEM; |
| |
| ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), |
| USB_REQ_GET_STATUS, USB_DIR_IN | type, 0, target, status, |
| sizeof(*status), USB_CTRL_GET_TIMEOUT); |
| |
| *(u16 *)data = *status; |
| kfree(status); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(usb_get_status); |
| |
| /** |
| * usb_clear_halt - tells device to clear endpoint halt/stall condition |
| * @dev: device whose endpoint is halted |
| * @pipe: endpoint "pipe" being cleared |
| * Context: !in_interrupt () |
| * |
| * This is used to clear halt conditions for bulk and interrupt endpoints, |
| * as reported by URB completion status. Endpoints that are halted are |
| * sometimes referred to as being "stalled". Such endpoints are unable |
| * to transmit or receive data until the halt status is cleared. Any URBs |
| * queued for such an endpoint should normally be unlinked by the driver |
| * before clearing the halt condition, as described in sections 5.7.5 |
| * and 5.8.5 of the USB 2.0 spec. |
| * |
| * Note that control and isochronous endpoints don't halt, although control |
| * endpoints report "protocol stall" (for unsupported requests) using the |
| * same status code used to report a true stall. |
| * |
| * This call is synchronous, and may not be used in an interrupt context. |
| * |
| * Returns zero on success, or else the status code returned by the |
| * underlying usb_control_msg() call. |
| */ |
| int usb_clear_halt(struct usb_device *dev, int pipe) |
| { |
| int result; |
| int endp = usb_pipeendpoint(pipe); |
| |
| if (usb_pipein(pipe)) |
| endp |= USB_DIR_IN; |
| |
| /* we don't care if it wasn't halted first. in fact some devices |
| * (like some ibmcam model 1 units) seem to expect hosts to make |
| * this request for iso endpoints, which can't halt! |
| */ |
| result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), |
| USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT, |
| USB_ENDPOINT_HALT, endp, NULL, 0, |
| USB_CTRL_SET_TIMEOUT); |
| |
| /* don't un-halt or force to DATA0 except on success */ |
| if (result < 0) |
| return result; |
| |
| /* NOTE: seems like Microsoft and Apple don't bother verifying |
| * the clear "took", so some devices could lock up if you check... |
| * such as the Hagiwara FlashGate DUAL. So we won't bother. |
| * |
| * NOTE: make sure the logic here doesn't diverge much from |
| * the copy in usb-storage, for as long as we need two copies. |
| */ |
| |
| usb_reset_endpoint(dev, endp); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(usb_clear_halt); |
| |
| static int create_intf_ep_devs(struct usb_interface *intf) |
| { |
| struct usb_device *udev = interface_to_usbdev(intf); |
| struct usb_host_interface *alt = intf->cur_altsetting; |
| int i; |
| |
| if (intf->ep_devs_created || intf->unregistering) |
| return 0; |
| |
| for (i = 0; i < alt->desc.bNumEndpoints; ++i) |
| (void) usb_create_ep_devs(&intf->dev, &alt->endpoint[i], udev); |
| intf->ep_devs_created = 1; |
| return 0; |
| } |
| |
| static void remove_intf_ep_devs(struct usb_interface *intf) |
| { |
| struct usb_host_interface *alt = intf->cur_altsetting; |
| int i; |
| |
| if (!intf->ep_devs_created) |
| return; |
| |
| for (i = 0; i < alt->desc.bNumEndpoints; ++i) |
| usb_remove_ep_devs(&alt->endpoint[i]); |
| intf->ep_devs_created = 0; |
| } |
| |
| /** |
| * usb_disable_endpoint -- Disable an endpoint by address |
| * @dev: the device whose endpoint is being disabled |
| * @epaddr: the endpoint's address. Endpoint number for output, |
| * endpoint number + USB_DIR_IN for input |
| * @reset_hardware: flag to erase any endpoint state stored in the |
| * controller hardware |
| * |
| * Disables the endpoint for URB submission and nukes all pending URBs. |
| * If @reset_hardware is set then also deallocates hcd/hardware state |
| * for the endpoint. |
| */ |
| void usb_disable_endpoint(struct usb_device *dev, unsigned int epaddr, |
| bool reset_hardware) |
| { |
| unsigned int epnum = epaddr & USB_ENDPOINT_NUMBER_MASK; |
| struct usb_host_endpoint *ep; |
| |
| if (!dev) |
| return; |
| |
| if (usb_endpoint_out(epaddr)) { |
| ep = dev->ep_out[epnum]; |
| if (reset_hardware) |
| dev->ep_out[epnum] = NULL; |
| } else { |
| ep = dev->ep_in[epnum]; |
| if (reset_hardware) |
| dev->ep_in[epnum] = NULL; |
| } |
| if (ep) { |
| ep->enabled = 0; |
| usb_hcd_flush_endpoint(dev, ep); |
| if (reset_hardware) |
| usb_hcd_disable_endpoint(dev, ep); |
| } |
| } |
| |
| /** |
| * usb_reset_endpoint - Reset an endpoint's state. |
| * @dev: the device whose endpoint is to be reset |
| * @epaddr: the endpoint's address. Endpoint number for output, |
| * endpoint number + USB_DIR_IN for input |
| * |
| * Resets any host-side endpoint state such as the toggle bit, |
| * sequence number or current window. |
| */ |
| void usb_reset_endpoint(struct usb_device *dev, unsigned int epaddr) |
| { |
| unsigned int epnum = epaddr & USB_ENDPOINT_NUMBER_MASK; |
| struct usb_host_endpoint *ep; |
| |
| if (usb_endpoint_out(epaddr)) |
| ep = dev->ep_out[epnum]; |
| else |
| ep = dev->ep_in[epnum]; |
| if (ep) |
| usb_hcd_reset_endpoint(dev, ep); |
| } |
| EXPORT_SYMBOL_GPL(usb_reset_endpoint); |
| |
| |
| /** |
| * usb_disable_interface -- Disable all endpoints for an interface |
| * @dev: the device whose interface is being disabled |
| * @intf: pointer to the interface descriptor |
| * @reset_hardware: flag to erase any endpoint state stored in the |
| * controller hardware |
| * |
| * Disables all the endpoints for the interface's current altsetting. |
| */ |
| void usb_disable_interface(struct usb_device *dev, struct usb_interface *intf, |
| bool reset_hardware) |
| { |
| struct usb_host_interface *alt = intf->cur_altsetting; |
| int i; |
| |
| for (i = 0; i < alt->desc.bNumEndpoints; ++i) { |
| usb_disable_endpoint(dev, |
| alt->endpoint[i].desc.bEndpointAddress, |
| reset_hardware); |
| } |
| } |
| |
| /** |
| * usb_disable_device - Disable all the endpoints for a USB device |
| * @dev: the device whose endpoints are being disabled |
| * @skip_ep0: 0 to disable endpoint 0, 1 to skip it. |
| * |
| * Disables all the device's endpoints, potentially including endpoint 0. |
| * Deallocates hcd/hardware state for the endpoints (nuking all or most |
| * pending urbs) and usbcore state for the interfaces, so that usbcore |
| * must usb_set_configuration() before any interfaces could be used. |
| */ |
| void usb_disable_device(struct usb_device *dev, int skip_ep0) |
| { |
| int i; |
| struct usb_hcd *hcd = bus_to_hcd(dev->bus); |
| |
| /* getting rid of interfaces will disconnect |
| * any drivers bound to them (a key side effect) |
| */ |
| if (dev->actconfig) { |
| /* |
| * FIXME: In order to avoid self-deadlock involving the |
| * bandwidth_mutex, we have to mark all the interfaces |
| * before unregistering any of them. |
| */ |
| for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) |
| dev->actconfig->interface[i]->unregistering = 1; |
| |
| for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) { |
| struct usb_interface *interface; |
| |
| /* remove this interface if it has been registered */ |
| interface = dev->actconfig->interface[i]; |
| if (!device_is_registered(&interface->dev)) |
| continue; |
| dev_dbg(&dev->dev, "unregistering interface %s\n", |
| dev_name(&interface->dev)); |
| remove_intf_ep_devs(interface); |
| device_del(&interface->dev); |
| } |
| |
| /* Now that the interfaces are unbound, nobody should |
| * try to access them. |
| */ |
| for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) { |
| put_device(&dev->actconfig->interface[i]->dev); |
| dev->actconfig->interface[i] = NULL; |
| } |
| usb_unlocked_disable_lpm(dev); |
| usb_disable_ltm(dev); |
| dev->actconfig = NULL; |
| if (dev->state == USB_STATE_CONFIGURED) |
| usb_set_device_state(dev, USB_STATE_ADDRESS); |
| } |
| |
| dev_dbg(&dev->dev, "%s nuking %s URBs\n", __func__, |
| skip_ep0 ? "non-ep0" : "all"); |
| if (hcd->driver->check_bandwidth) { |
| /* First pass: Cancel URBs, leave endpoint pointers intact. */ |
| for (i = skip_ep0; i < 16; ++i) { |
| usb_disable_endpoint(dev, i, false); |
| usb_disable_endpoint(dev, i + USB_DIR_IN, false); |
| } |
| /* Remove endpoints from the host controller internal state */ |
| mutex_lock(hcd->bandwidth_mutex); |
| usb_hcd_alloc_bandwidth(dev, NULL, NULL, NULL); |
| mutex_unlock(hcd->bandwidth_mutex); |
| /* Second pass: remove endpoint pointers */ |
| } |
| for (i = skip_ep0; i < 16; ++i) { |
| usb_disable_endpoint(dev, i, true); |
| usb_disable_endpoint(dev, i + USB_DIR_IN, true); |
| } |
| } |
| |
| /** |
| * usb_enable_endpoint - Enable an endpoint for USB communications |
| * @dev: the device whose interface is being enabled |
| * @ep: the endpoint |
| * @reset_ep: flag to reset the endpoint state |
| * |
| * Resets the endpoint state if asked, and sets dev->ep_{in,out} pointers. |
| * For control endpoints, both the input and output sides are handled. |
| */ |
| void usb_enable_endpoint(struct usb_device *dev, struct usb_host_endpoint *ep, |
| bool reset_ep) |
| { |
| int epnum = usb_endpoint_num(&ep->desc); |
| int is_out = usb_endpoint_dir_out(&ep->desc); |
| int is_control = usb_endpoint_xfer_control(&ep->desc); |
| |
| if (reset_ep) |
| usb_hcd_reset_endpoint(dev, ep); |
| if (is_out || is_control) |
| dev->ep_out[epnum] = ep; |
| if (!is_out || is_control) |
| dev->ep_in[epnum] = ep; |
| ep->enabled = 1; |
| } |
| |
| /** |
| * usb_enable_interface - Enable all the endpoints for an interface |
| * @dev: the device whose interface is being enabled |
| * @intf: pointer to the interface descriptor |
| * @reset_eps: flag to reset the endpoints' state |
| * |
| * Enables all the endpoints for the interface's current altsetting. |
| */ |
| void usb_enable_interface(struct usb_device *dev, |
| struct usb_interface *intf, bool reset_eps) |
| { |
| struct usb_host_interface *alt = intf->cur_altsetting; |
| int i; |
| |
| for (i = 0; i < alt->desc.bNumEndpoints; ++i) |
| usb_enable_endpoint(dev, &alt->endpoint[i], reset_eps); |
| } |
| |
| /** |
| * usb_set_interface - Makes a particular alternate setting be current |
| * @dev: the device whose interface is being updated |
| * @interface: the interface being updated |
| * @alternate: the setting being chosen. |
| * Context: !in_interrupt () |
| * |
| * This is used to enable data transfers on interfaces that may not |
| * be enabled by default. Not all devices support such configurability. |
| * Only the driver bound to an interface may change its setting. |
| * |
| * Within any given configuration, each interface may have several |
| * alternative settings. These are often used to control levels of |
| * bandwidth consumption. For example, the default setting for a high |
| * speed interrupt endpoint may not send more than 64 bytes per microframe, |
| * while interrupt transfers of up to 3KBytes per microframe are legal. |
| * Also, isochronous endpoints may never be part of an |
| * interface's default setting. To access such bandwidth, alternate |
| * interface settings must be made current. |
| * |
| * Note that in the Linux USB subsystem, bandwidth associated with |
| * an endpoint in a given alternate setting is not reserved until an URB |
| * is submitted that needs that bandwidth. Some other operating systems |
| * allocate bandwidth early, when a configuration is chosen. |
| * |
| * This call is synchronous, and may not be used in an interrupt context. |
| * Also, drivers must not change altsettings while urbs are scheduled for |
| * endpoints in that interface; all such urbs must first be completed |
| * (perhaps forced by unlinking). |
| * |
| * Returns zero on success, or else the status code returned by the |
| * underlying usb_control_msg() call. |
| */ |
| int usb_set_interface(struct usb_device *dev, int interface, int alternate) |
| { |
| struct usb_interface *iface; |
| struct usb_host_interface *alt; |
| struct usb_hcd *hcd = bus_to_hcd(dev->bus); |
| int ret; |
| int manual = 0; |
| unsigned int epaddr; |
| unsigned int pipe; |
| |
| if (dev->state == USB_STATE_SUSPENDED) |
| return -EHOSTUNREACH; |
| |
| iface = usb_ifnum_to_if(dev, interface); |
| if (!iface) { |
| dev_dbg(&dev->dev, "selecting invalid interface %d\n", |
| interface); |
| return -EINVAL; |
| } |
| if (iface->unregistering) |
| return -ENODEV; |
| |
| alt = usb_altnum_to_altsetting(iface, alternate); |
| if (!alt) { |
| dev_warn(&dev->dev, "selecting invalid altsetting %d\n", |
| alternate); |
| return -EINVAL; |
| } |
| |
| /* Make sure we have enough bandwidth for this alternate interface. |
| * Remove the current alt setting and add the new alt setting. |
| */ |
| mutex_lock(hcd->bandwidth_mutex); |
| /* Disable LPM, and re-enable it once the new alt setting is installed, |
| * so that the xHCI driver can recalculate the U1/U2 timeouts. |
| */ |
| if (usb_disable_lpm(dev)) { |
| dev_err(&iface->dev, "%s Failed to disable LPM\n.", __func__); |
| mutex_unlock(hcd->bandwidth_mutex); |
| return -ENOMEM; |
| } |
| ret = usb_hcd_alloc_bandwidth(dev, NULL, iface->cur_altsetting, alt); |
| if (ret < 0) { |
| dev_info(&dev->dev, "Not enough bandwidth for altsetting %d\n", |
| alternate); |
| usb_enable_lpm(dev); |
| mutex_unlock(hcd->bandwidth_mutex); |
| return ret; |
| } |
| |
| if (dev->quirks & USB_QUIRK_NO_SET_INTF) |
| ret = -EPIPE; |
| else |
| ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), |
| USB_REQ_SET_INTERFACE, USB_RECIP_INTERFACE, |
| alternate, interface, NULL, 0, 5000); |
| |
| /* 9.4.10 says devices don't need this and are free to STALL the |
| * request if the interface only has one alternate setting. |
| */ |
| if (ret == -EPIPE && iface->num_altsetting == 1) { |
| dev_dbg(&dev->dev, |
| "manual set_interface for iface %d, alt %d\n", |
| interface, alternate); |
| manual = 1; |
| } else if (ret < 0) { |
| /* Re-instate the old alt setting */ |
| usb_hcd_alloc_bandwidth(dev, NULL, alt, iface->cur_altsetting); |
| usb_enable_lpm(dev); |
| mutex_unlock(hcd->bandwidth_mutex); |
| return ret; |
| } |
| mutex_unlock(hcd->bandwidth_mutex); |
| |
| /* FIXME drivers shouldn't need to replicate/bugfix the logic here |
| * when they implement async or easily-killable versions of this or |
| * other "should-be-internal" functions (like clear_halt). |
| * should hcd+usbcore postprocess control requests? |
| */ |
| |
| /* prevent submissions using previous endpoint settings */ |
| if (iface->cur_altsetting != alt) { |
| remove_intf_ep_devs(iface); |
| usb_remove_sysfs_intf_files(iface); |
| } |
| usb_disable_interface(dev, iface, true); |
| |
| iface->cur_altsetting = alt; |
| |
| /* Now that the interface is installed, re-enable LPM. */ |
| usb_unlocked_enable_lpm(dev); |
| |
| /* If the interface only has one altsetting and the device didn't |
| * accept the request, we attempt to carry out the equivalent action |
| * by manually clearing the HALT feature for each endpoint in the |
| * new altsetting. |
| */ |
| if (manual) { |
| int i; |
| |
| for (i = 0; i < alt->desc.bNumEndpoints; i++) { |
| epaddr = alt->endpoint[i].desc.bEndpointAddress; |
| pipe = __create_pipe(dev, |
| USB_ENDPOINT_NUMBER_MASK & epaddr) | |
| (usb_endpoint_out(epaddr) ? |
| USB_DIR_OUT : USB_DIR_IN); |
| |
| usb_clear_halt(dev, pipe); |
| } |
| } |
| |
| /* 9.1.1.5: reset toggles for all endpoints in the new altsetting |
| * |
| * Note: |
| * Despite EP0 is always present in all interfaces/AS, the list of |
| * endpoints from the descriptor does not contain EP0. Due to its |
| * omnipresence one might expect EP0 being considered "affected" by |
| * any SetInterface request and hence assume toggles need to be reset. |
| * However, EP0 toggles are re-synced for every individual transfer |
| * during the SETUP stage - hence EP0 toggles are "don't care" here. |
| * (Likewise, EP0 never "halts" on well designed devices.) |
| */ |
| usb_enable_interface(dev, iface, true); |
| if (device_is_registered(&iface->dev)) { |
| usb_create_sysfs_intf_files(iface); |
| create_intf_ep_devs(iface); |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(usb_set_interface); |
| |
| /** |
| * usb_reset_configuration - lightweight device reset |
| * @dev: the device whose configuration is being reset |
| * |
| * This issues a standard SET_CONFIGURATION request to the device using |
| * the current configuration. The effect is to reset most USB-related |
| * state in the device, including interface altsettings (reset to zero), |
| * endpoint halts (cleared), and endpoint state (only for bulk and interrupt |
| * endpoints). Other usbcore state is unchanged, including bindings of |
| * usb device drivers to interfaces. |
| * |
| * Because this affects multiple interfaces, avoid using this with composite |
| * (multi-interface) devices. Instead, the driver for each interface may |
| * use usb_set_interface() on the interfaces it claims. Be careful though; |
| * some devices don't support the SET_INTERFACE request, and others won't |
| * reset all the interface state (notably endpoint state). Resetting the whole |
| * configuration would affect other drivers' interfaces. |
| * |
| * The caller must own the device lock. |
| * |
| * Returns zero on success, else a negative error code. |
| */ |
| int usb_reset_configuration(struct usb_device *dev) |
| { |
| int i, retval; |
| struct usb_host_config *config; |
| struct usb_hcd *hcd = bus_to_hcd(dev->bus); |
| |
| if (dev->state == USB_STATE_SUSPENDED) |
| return -EHOSTUNREACH; |
| |
| /* caller must have locked the device and must own |
| * the usb bus readlock (so driver bindings are stable); |
| * calls during probe() are fine |
| */ |
| |
| for (i = 1; i < 16; ++i) { |
| usb_disable_endpoint(dev, i, true); |
| usb_disable_endpoint(dev, i + USB_DIR_IN, true); |
| } |
| |
| config = dev->actconfig; |
| retval = 0; |
| mutex_lock(hcd->bandwidth_mutex); |
| /* Disable LPM, and re-enable it once the configuration is reset, so |
| * that the xHCI driver can recalculate the U1/U2 timeouts. |
| */ |
| if (usb_disable_lpm(dev)) { |
| dev_err(&dev->dev, "%s Failed to disable LPM\n.", __func__); |
| mutex_unlock(hcd->bandwidth_mutex); |
| return -ENOMEM; |
| } |
| /* Make sure we have enough bandwidth for each alternate setting 0 */ |
| for (i = 0; i < config->desc.bNumInterfaces; i++) { |
| struct usb_interface *intf = config->interface[i]; |
| struct usb_host_interface *alt; |
| |
| alt = usb_altnum_to_altsetting(intf, 0); |
| if (!alt) |
| alt = &intf->altsetting[0]; |
| if (alt != intf->cur_altsetting) |
| retval = usb_hcd_alloc_bandwidth(dev, NULL, |
| intf->cur_altsetting, alt); |
| if (retval < 0) |
| break; |
| } |
| /* If not, reinstate the old alternate settings */ |
| if (retval < 0) { |
| reset_old_alts: |
| for (i--; i >= 0; i--) { |
| struct usb_interface *intf = config->interface[i]; |
| struct usb_host_interface *alt; |
| |
| alt = usb_altnum_to_altsetting(intf, 0); |
| if (!alt) |
| alt = &intf->altsetting[0]; |
| if (alt != intf->cur_altsetting) |
| usb_hcd_alloc_bandwidth(dev, NULL, |
| alt, intf->cur_altsetting); |
| } |
| usb_enable_lpm(dev); |
| mutex_unlock(hcd->bandwidth_mutex); |
| return retval; |
| } |
| retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), |
| USB_REQ_SET_CONFIGURATION, 0, |
| config->desc.bConfigurationValue, 0, |
| NULL, 0, USB_CTRL_SET_TIMEOUT); |
| if (retval < 0) |
| goto reset_old_alts; |
| mutex_unlock(hcd->bandwidth_mutex); |
| |
| /* re-init hc/hcd interface/endpoint state */ |
| for (i = 0; i < config->desc.bNumInterfaces; i++) { |
| struct usb_interface *intf = config->interface[i]; |
| struct usb_host_interface *alt; |
| |
| alt = usb_altnum_to_altsetting(intf, 0); |
| |
| /* No altsetting 0? We'll assume the first altsetting. |
| * We could use a GetInterface call, but if a device is |
| * so non-compliant that it doesn't have altsetting 0 |
| * then I wouldn't trust its reply anyway. |
| */ |
| if (!alt) |
| alt = &intf->altsetting[0]; |
| |
| if (alt != intf->cur_altsetting) { |
| remove_intf_ep_devs(intf); |
| usb_remove_sysfs_intf_files(intf); |
| } |
| intf->cur_altsetting = alt; |
| usb_enable_interface(dev, intf, true); |
| if (device_is_registered(&intf->dev)) { |
| usb_create_sysfs_intf_files(intf); |
| create_intf_ep_devs(intf); |
| } |
| } |
| /* Now that the interfaces are installed, re-enable LPM. */ |
| usb_unlocked_enable_lpm(dev); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(usb_reset_configuration); |
| |
| static void usb_release_interface(struct device *dev) |
| { |
| struct usb_interface *intf = to_usb_interface(dev); |
| struct usb_interface_cache *intfc = |
| altsetting_to_usb_interface_cache(intf->altsetting); |
| |
| kref_put(&intfc->ref, usb_release_interface_cache); |
| kfree(intf); |
| } |
| |
| #ifdef CONFIG_HOTPLUG |
| static int usb_if_uevent(struct device *dev, struct kobj_uevent_env *env) |
| { |
| struct usb_device *usb_dev; |
| struct usb_interface *intf; |
| struct usb_host_interface *alt; |
| |
| intf = to_usb_interface(dev); |
| usb_dev = interface_to_usbdev(intf); |
| alt = intf->cur_altsetting; |
| |
| if (add_uevent_var(env, "INTERFACE=%d/%d/%d", |
| alt->desc.bInterfaceClass, |
| alt->desc.bInterfaceSubClass, |
| alt->desc.bInterfaceProtocol)) |
| return -ENOMEM; |
| |
| if (add_uevent_var(env, |
| "MODALIAS=usb:" |
| "v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02Xic%02Xisc%02Xip%02Xin%02X", |
| le16_to_cpu(usb_dev->descriptor.idVendor), |
| le16_to_cpu(usb_dev->descriptor.idProduct), |
| le16_to_cpu(usb_dev->descriptor.bcdDevice), |
| usb_dev->descriptor.bDeviceClass, |
| usb_dev->descriptor.bDeviceSubClass, |
| usb_dev->descriptor.bDeviceProtocol, |
| alt->desc.bInterfaceClass, |
| alt->desc.bInterfaceSubClass, |
| alt->desc.bInterfaceProtocol, |
| alt->desc.bInterfaceNumber)) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| #else |
| |
| static int usb_if_uevent(struct device *dev, struct kobj_uevent_env *env) |
| { |
| return -ENODEV; |
| } |
| #endif /* CONFIG_HOTPLUG */ |
| |
| struct device_type usb_if_device_type = { |
| .name = "usb_interface", |
| .release = usb_release_interface, |
| .uevent = usb_if_uevent, |
| }; |
| |
| static struct usb_interface_assoc_descriptor *find_iad(struct usb_device *dev, |
| struct usb_host_config *config, |
| u8 inum) |
| { |
| struct usb_interface_assoc_descriptor *retval = NULL; |
| struct usb_interface_assoc_descriptor *intf_assoc; |
| int first_intf; |
| int last_intf; |
| int i; |
| |
| for (i = 0; (i < USB_MAXIADS && config->intf_assoc[i]); i++) { |
| intf_assoc = config->intf_assoc[i]; |
| if (intf_assoc->bInterfaceCount == 0) |
| continue; |
| |
| first_intf = intf_assoc->bFirstInterface; |
| last_intf = first_intf + (intf_assoc->bInterfaceCount - 1); |
| if (inum >= first_intf && inum <= last_intf) { |
| if (!retval) |
| retval = intf_assoc; |
| else |
| dev_err(&dev->dev, "Interface #%d referenced" |
| " by multiple IADs\n", inum); |
| } |
| } |
| |
| return retval; |
| } |
| |
| |
| /* |
| * Internal function to queue a device reset |
| * |
| * This is initialized into the workstruct in 'struct |
| * usb_device->reset_ws' that is launched by |
| * message.c:usb_set_configuration() when initializing each 'struct |
| * usb_interface'. |
| * |
| * It is safe to get the USB device without reference counts because |
| * the life cycle of @iface is bound to the life cycle of @udev. Then, |
| * this function will be ran only if @iface is alive (and before |
| * freeing it any scheduled instances of it will have been cancelled). |
| * |
| * We need to set a flag (usb_dev->reset_running) because when we call |
| * the reset, the interfaces might be unbound. The current interface |
| * cannot try to remove the queued work as it would cause a deadlock |
| * (you cannot remove your work from within your executing |
| * workqueue). This flag lets it know, so that |
| * usb_cancel_queued_reset() doesn't try to do it. |
| * |
| * See usb_queue_reset_device() for more details |
| */ |
| static void __usb_queue_reset_device(struct work_struct *ws) |
| { |
| int rc; |
| struct usb_interface *iface = |
| container_of(ws, struct usb_interface, reset_ws); |
| struct usb_device *udev = interface_to_usbdev(iface); |
| |
| rc = usb_lock_device_for_reset(udev, iface); |
| if (rc >= 0) { |
| iface->reset_running = 1; |
| usb_reset_device(udev); |
| iface->reset_running = 0; |
| usb_unlock_device(udev); |
| } |
| } |
| |
| |
| /* |
| * usb_set_configuration - Makes a particular device setting be current |
| * @dev: the device whose configuration is being updated |
| * @configuration: the configuration being chosen. |
| * Context: !in_interrupt(), caller owns the device lock |
| * |
| * This is used to enable non-default device modes. Not all devices |
| * use this kind of configurability; many devices only have one |
| * configuration. |
| * |
| * @configuration is the value of the configuration to be installed. |
| * According to the USB spec (e.g. section 9.1.1.5), configuration values |
| * must be non-zero; a value of zero indicates that the device in |
| * unconfigured. However some devices erroneously use 0 as one of their |
| * configuration values. To help manage such devices, this routine will |
| * accept @configuration = -1 as indicating the device should be put in |
| * an unconfigured state. |
| * |
| * USB device configurations may affect Linux interoperability, |
| * power consumption and the functionality available. For example, |
| * the default configuration is limited to using 100mA of bus power, |
| * so that when certain device functionality requires more power, |
| * and the device is bus powered, that functionality should be in some |
| * non-default device configuration. Other device modes may also be |
| * reflected as configuration options, such as whether two ISDN |
| * channels are available independently; and choosing between open |
| * standard device protocols (like CDC) or proprietary ones. |
| * |
| * Note that a non-authorized device (dev->authorized == 0) will only |
| * be put in unconfigured mode. |
| * |
| * Note that USB has an additional level of device configurability, |
| * associated with interfaces. That configurability is accessed using |
| * usb_set_interface(). |
| * |
| * This call is synchronous. The calling context must be able to sleep, |
| * must own the device lock, and must not hold the driver model's USB |
| * bus mutex; usb interface driver probe() methods cannot use this routine. |
| * |
| * Returns zero on success, or else the status code returned by the |
| * underlying call that failed. On successful completion, each interface |
| * in the original device configuration has been destroyed, and each one |
| * in the new configuration has been probed by all relevant usb device |
| * drivers currently known to the kernel. |
| */ |
| int usb_set_configuration(struct usb_device *dev, int configuration) |
| { |
| int i, ret; |
| struct usb_host_config *cp = NULL; |
| struct usb_interface **new_interfaces = NULL; |
| struct usb_hcd *hcd = bus_to_hcd(dev->bus); |
| int n, nintf; |
| |
| if (dev->authorized == 0 || configuration == -1) |
| configuration = 0; |
| else { |
| for (i = 0; i < dev->descriptor.bNumConfigurations; i++) { |
| if (dev->config[i].desc.bConfigurationValue == |
| configuration) { |
| cp = &dev->config[i]; |
| break; |
| } |
| } |
| } |
| if ((!cp && configuration != 0)) |
| return -EINVAL; |
| |
| /* The USB spec says configuration 0 means unconfigured. |
| * But if a device includes a configuration numbered 0, |
| * we will accept it as a correctly configured state. |
| * Use -1 if you really want to unconfigure the device. |
| */ |
| if (cp && configuration == 0) |
| dev_warn(&dev->dev, "config 0 descriptor??\n"); |
| |
| /* Allocate memory for new interfaces before doing anything else, |
| * so that if we run out then nothing will have changed. */ |
| n = nintf = 0; |
| if (cp) { |
| nintf = cp->desc.bNumInterfaces; |
| new_interfaces = kmalloc(nintf * sizeof(*new_interfaces), |
| GFP_NOIO); |
| if (!new_interfaces) { |
| dev_err(&dev->dev, "Out of memory\n"); |
| return -ENOMEM; |
| } |
| |
| for (; n < nintf; ++n) { |
| new_interfaces[n] = kzalloc( |
| sizeof(struct usb_interface), |
| GFP_NOIO); |
| if (!new_interfaces[n]) { |
| dev_err(&dev->dev, "Out of memory\n"); |
| ret = -ENOMEM; |
| free_interfaces: |
| while (--n >= 0) |
| kfree(new_interfaces[n]); |
| kfree(new_interfaces); |
| return ret; |
| } |
| } |
| |
| i = dev->bus_mA - cp->desc.bMaxPower * 2; |
| if (i < 0) |
| dev_warn(&dev->dev, "new config #%d exceeds power " |
| "limit by %dmA\n", |
| configuration, -i); |
| } |
| |
| /* Wake up the device so we can send it the Set-Config request */ |
| ret = usb_autoresume_device(dev); |
| if (ret) |
| goto free_interfaces; |
| |
| /* if it's already configured, clear out old state first. |
| * getting rid of old interfaces means unbinding their drivers. |
| */ |
| if (dev->state != USB_STATE_ADDRESS) |
| usb_disable_device(dev, 1); /* Skip ep0 */ |
| |
| /* Get rid of pending async Set-Config requests for this device */ |
| cancel_async_set_config(dev); |
| |
| /* Make sure we have bandwidth (and available HCD resources) for this |
| * configuration. Remove endpoints from the schedule if we're dropping |
| * this configuration to set configuration 0. After this point, the |
| * host controller will not allow submissions to dropped endpoints. If |
| * this call fails, the device state is unchanged. |
| */ |
| mutex_lock(hcd->bandwidth_mutex); |
| /* Disable LPM, and re-enable it once the new configuration is |
| * installed, so that the xHCI driver can recalculate the U1/U2 |
| * timeouts. |
| */ |
| if (dev->actconfig && usb_disable_lpm(dev)) { |
| dev_err(&dev->dev, "%s Failed to disable LPM\n.", __func__); |
| mutex_unlock(hcd->bandwidth_mutex); |
| return -ENOMEM; |
| } |
| ret = usb_hcd_alloc_bandwidth(dev, cp, NULL, NULL); |
| if (ret < 0) { |
| if (dev->actconfig) |
| usb_enable_lpm(dev); |
| mutex_unlock(hcd->bandwidth_mutex); |
| usb_autosuspend_device(dev); |
| goto free_interfaces; |
| } |
| |
| /* |
| * Initialize the new interface structures and the |
| * hc/hcd/usbcore interface/endpoint state. |
| */ |
| for (i = 0; i < nintf; ++i) { |
| struct usb_interface_cache *intfc; |
| struct usb_interface *intf; |
| struct usb_host_interface *alt; |
| |
| cp->interface[i] = intf = new_interfaces[i]; |
| intfc = cp->intf_cache[i]; |
| intf->altsetting = intfc->altsetting; |
| intf->num_altsetting = intfc->num_altsetting; |
| kref_get(&intfc->ref); |
| |
| alt = usb_altnum_to_altsetting(intf, 0); |
| |
| /* No altsetting 0? We'll assume the first altsetting. |
| * We could use a GetInterface call, but if a device is |
| * so non-compliant that it doesn't have altsetting 0 |
| * then I wouldn't trust its reply anyway. |
| */ |
| if (!alt) |
| alt = &intf->altsetting[0]; |
| |
| intf->intf_assoc = |
| find_iad(dev, cp, alt->desc.bInterfaceNumber); |
| intf->cur_altsetting = alt; |
| usb_enable_interface(dev, intf, true); |
| intf->dev.parent = &dev->dev; |
| intf->dev.driver = NULL; |
| intf->dev.bus = &usb_bus_type; |
| intf->dev.type = &usb_if_device_type; |
| intf->dev.groups = usb_interface_groups; |
| intf->dev.dma_mask = dev->dev.dma_mask; |
| INIT_WORK(&intf->reset_ws, __usb_queue_reset_device); |
| intf->minor = -1; |
| device_initialize(&intf->dev); |
| pm_runtime_no_callbacks(&intf->dev); |
| dev_set_name(&intf->dev, "%d-%s:%d.%d", |
| dev->bus->busnum, dev->devpath, |
| configuration, alt->desc.bInterfaceNumber); |
| } |
| kfree(new_interfaces); |
| |
| ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), |
| USB_REQ_SET_CONFIGURATION, 0, configuration, 0, |
| NULL, 0, USB_CTRL_SET_TIMEOUT); |
| if (ret < 0 && cp) { |
| /* |
| * All the old state is gone, so what else can we do? |
| * The device is probably useless now anyway. |
| */ |
| usb_hcd_alloc_bandwidth(dev, NULL, NULL, NULL); |
| for (i = 0; i < nintf; ++i) { |
| usb_disable_interface(dev, cp->interface[i], true); |
| put_device(&cp->interface[i]->dev); |
| cp->interface[i] = NULL; |
| } |
| cp = NULL; |
| } |
| |
| dev->actconfig = cp; |
| mutex_unlock(hcd->bandwidth_mutex); |
| |
| if (!cp) { |
| usb_set_device_state(dev, USB_STATE_ADDRESS); |
| |
| /* Leave LPM disabled while the device is unconfigured. */ |
| usb_autosuspend_device(dev); |
| return ret; |
| } |
| usb_set_device_state(dev, USB_STATE_CONFIGURED); |
| |
| if (cp->string == NULL && |
| !(dev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS)) |
| cp->string = usb_cache_string(dev, cp->desc.iConfiguration); |
| |
| /* Now that the interfaces are installed, re-enable LPM. */ |
| usb_unlocked_enable_lpm(dev); |
| /* Enable LTM if it was turned off by usb_disable_device. */ |
| usb_enable_ltm(dev); |
| |
| /* Now that all the interfaces are set up, register them |
| * to trigger binding of drivers to interfaces. probe() |
| * routines may install different altsettings and may |
| * claim() any interfaces not yet bound. Many class drivers |
| * need that: CDC, audio, video, etc. |
| */ |
| for (i = 0; i < nintf; ++i) { |
| struct usb_interface *intf = cp->interface[i]; |
| |
| dev_dbg(&dev->dev, |
| "adding %s (config #%d, interface %d)\n", |
| dev_name(&intf->dev), configuration, |
| intf->cur_altsetting->desc.bInterfaceNumber); |
| device_enable_async_suspend(&intf->dev); |
| ret = device_add(&intf->dev); |
| if (ret != 0) { |
| dev_err(&dev->dev, "device_add(%s) --> %d\n", |
| dev_name(&intf->dev), ret); |
| continue; |
| } |
| create_intf_ep_devs(intf); |
| } |
| |
| usb_autosuspend_device(dev); |
| return 0; |
| } |
| |
| static LIST_HEAD(set_config_list); |
| static DEFINE_SPINLOCK(set_config_lock); |
| |
| struct set_config_request { |
| struct usb_device *udev; |
| int config; |
| struct work_struct work; |
| struct list_head node; |
| }; |
| |
| /* Worker routine for usb_driver_set_configuration() */ |
| static void driver_set_config_work(struct work_struct *work) |
| { |
| struct set_config_request *req = |
| container_of(work, struct set_config_request, work); |
| struct usb_device *udev = req->udev; |
| |
| usb_lock_device(udev); |
| spin_lock(&set_config_lock); |
| list_del(&req->node); |
| spin_unlock(&set_config_lock); |
| |
| if (req->config >= -1) /* Is req still valid? */ |
| usb_set_configuration(udev, req->config); |
| usb_unlock_device(udev); |
| usb_put_dev(udev); |
| kfree(req); |
| } |
| |
| /* Cancel pending Set-Config requests for a device whose configuration |
| * was just changed |
| */ |
| static void cancel_async_set_config(struct usb_device *udev) |
| { |
| struct set_config_request *req; |
| |
| spin_lock(&set_config_lock); |
| list_for_each_entry(req, &set_config_list, node) { |
| if (req->udev == udev) |
| req->config = -999; /* Mark as cancelled */ |
| } |
| spin_unlock(&set_config_lock); |
| } |
| |
| /** |
| * usb_driver_set_configuration - Provide a way for drivers to change device configurations |
| * @udev: the device whose configuration is being updated |
| * @config: the configuration being chosen. |
| * Context: In process context, must be able to sleep |
| * |
| * Device interface drivers are not allowed to change device configurations. |
| * This is because changing configurations will destroy the interface the |
| * driver is bound to and create new ones; it would be like a floppy-disk |
| * driver telling the computer to replace the floppy-disk drive with a |
| * tape drive! |
| * |
| * Still, in certain specialized circumstances the need may arise. This |
| * routine gets around the normal restrictions by using a work thread to |
| * submit the change-config request. |
| * |
| * Returns 0 if the request was successfully queued, error code otherwise. |
| * The caller has no way to know whether the queued request will eventually |
| * succeed. |
| */ |
| int usb_driver_set_configuration(struct usb_device *udev, int config) |
| { |
| struct set_config_request *req; |
| |
| req = kmalloc(sizeof(*req), GFP_KERNEL); |
| if (!req) |
| return -ENOMEM; |
| req->udev = udev; |
| req->config = config; |
| INIT_WORK(&req->work, driver_set_config_work); |
| |
| spin_lock(&set_config_lock); |
| list_add(&req->node, &set_config_list); |
| spin_unlock(&set_config_lock); |
| |
| usb_get_dev(udev); |
| schedule_work(&req->work); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(usb_driver_set_configuration); |