Greg Kroah-Hartman | ba4468d4 | 2014-08-30 17:06:54 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Greybus "AP" USB driver |
| 3 | * |
| 4 | * Copyright 2014 Google Inc. |
| 5 | * |
| 6 | * Released under the GPLv2 only. |
| 7 | */ |
| 8 | #include <linux/kernel.h> |
| 9 | #include <linux/module.h> |
| 10 | #include <linux/slab.h> |
| 11 | #include <linux/errno.h> |
Matt Porter | f0f7091 | 2014-09-30 16:01:40 -0400 | [diff] [blame] | 12 | #include <linux/sizes.h> |
Greg Kroah-Hartman | ba4468d4 | 2014-08-30 17:06:54 -0700 | [diff] [blame] | 13 | #include <linux/usb.h> |
Alex Elder | 1cfc667 | 2014-09-30 19:25:21 -0500 | [diff] [blame] | 14 | |
Greg Kroah-Hartman | de536e3 | 2014-08-31 16:17:04 -0700 | [diff] [blame] | 15 | #include "greybus.h" |
Greg Kroah-Hartman | 43cc32a | 2014-09-07 13:51:12 -0700 | [diff] [blame] | 16 | #include "svc_msg.h" |
Alex Elder | 1cfc667 | 2014-09-30 19:25:21 -0500 | [diff] [blame] | 17 | #include "kernel_ver.h" |
Greg Kroah-Hartman | ba4468d4 | 2014-08-30 17:06:54 -0700 | [diff] [blame] | 18 | |
Greg Kroah-Hartman | 29f000f | 2014-09-19 18:37:44 -0700 | [diff] [blame] | 19 | /* Memory sizes for the buffers sent to/from the ES1 controller */ |
Matt Porter | f0f7091 | 2014-09-30 16:01:40 -0400 | [diff] [blame] | 20 | #define ES1_SVC_MSG_SIZE (sizeof(struct svc_msg) + SZ_64K) |
Greg Kroah-Hartman | 29f000f | 2014-09-19 18:37:44 -0700 | [diff] [blame] | 21 | #define ES1_GBUF_MSG_SIZE PAGE_SIZE |
| 22 | |
| 23 | |
Greg Kroah-Hartman | ba4468d4 | 2014-08-30 17:06:54 -0700 | [diff] [blame] | 24 | static const struct usb_device_id id_table[] = { |
Greg Kroah-Hartman | 7f9e05e | 2014-09-13 17:28:33 -0700 | [diff] [blame] | 25 | /* Made up numbers for the SVC USB Bridge in ES1 */ |
| 26 | { USB_DEVICE(0xffff, 0x0001) }, |
Greg Kroah-Hartman | ba4468d4 | 2014-08-30 17:06:54 -0700 | [diff] [blame] | 27 | { }, |
| 28 | }; |
| 29 | MODULE_DEVICE_TABLE(usb, id_table); |
| 30 | |
Greg Kroah-Hartman | 1129973 | 2014-09-12 21:17:37 -0700 | [diff] [blame] | 31 | /* |
| 32 | * Number of CPort IN urbs in flight at any point in time. |
| 33 | * Adjust if we are having stalls in the USB buffer due to not enough urbs in |
| 34 | * flight. |
| 35 | */ |
| 36 | #define NUM_CPORT_IN_URB 4 |
| 37 | |
| 38 | /* Number of CPort OUT urbs in flight at any point in time. |
| 39 | * Adjust if we get messages saying we are out of urbs in the system log. |
| 40 | */ |
| 41 | #define NUM_CPORT_OUT_URB 8 |
| 42 | |
Greg Kroah-Hartman | 7f9e05e | 2014-09-13 17:28:33 -0700 | [diff] [blame] | 43 | /** |
| 44 | * es1_ap_dev - ES1 USB Bridge to AP structure |
| 45 | * @usb_dev: pointer to the USB device we are. |
| 46 | * @usb_intf: pointer to the USB interface we are bound to. |
| 47 | * @hd: pointer to our greybus_host_device structure |
| 48 | * @control_endpoint: endpoint to send data to SVC |
| 49 | * @svc_endpoint: endpoint for SVC data in |
| 50 | * @cport_in_endpoint: bulk in endpoint for CPort data |
| 51 | * @cport-out_endpoint: bulk out endpoint for CPort data |
| 52 | * @svc_buffer: buffer for SVC messages coming in on @svc_endpoint |
| 53 | * @svc_urb: urb for SVC messages coming in on @svc_endpoint |
| 54 | * @cport_in_urb: array of urbs for the CPort in messages |
| 55 | * @cport_in_buffer: array of buffers for the @cport_in_urb urbs |
| 56 | * @cport_out_urb: array of urbs for the CPort out messages |
| 57 | * @cport_out_urb_busy: array of flags to see if the @cport_out_urb is busy or |
| 58 | * not. |
| 59 | * @cport_out_urb_lock: locks the @cport_out_urb_busy "list" |
| 60 | */ |
Greg Kroah-Hartman | 6f83ab7 | 2014-08-30 17:30:04 -0700 | [diff] [blame] | 61 | struct es1_ap_dev { |
| 62 | struct usb_device *usb_dev; |
| 63 | struct usb_interface *usb_intf; |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 64 | struct greybus_host_device *hd; |
Greg Kroah-Hartman | 6f83ab7 | 2014-08-30 17:30:04 -0700 | [diff] [blame] | 65 | |
Greg Kroah-Hartman | 7f9e05e | 2014-09-13 17:28:33 -0700 | [diff] [blame] | 66 | __u8 control_endpoint; |
| 67 | __u8 svc_endpoint; |
| 68 | __u8 cport_in_endpoint; |
| 69 | __u8 cport_out_endpoint; |
| 70 | |
| 71 | u8 *svc_buffer; |
| 72 | struct urb *svc_urb; |
| 73 | |
| 74 | struct urb *cport_in_urb[NUM_CPORT_IN_URB]; |
| 75 | u8 *cport_in_buffer[NUM_CPORT_IN_URB]; |
| 76 | struct urb *cport_out_urb[NUM_CPORT_OUT_URB]; |
| 77 | bool cport_out_urb_busy[NUM_CPORT_OUT_URB]; |
| 78 | spinlock_t cport_out_urb_lock; |
Greg Kroah-Hartman | 6f83ab7 | 2014-08-30 17:30:04 -0700 | [diff] [blame] | 79 | }; |
| 80 | |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 81 | static inline struct es1_ap_dev *hd_to_es1(struct greybus_host_device *hd) |
| 82 | { |
Alex Elder | 69f93ab | 2014-09-22 18:53:02 -0500 | [diff] [blame] | 83 | return (struct es1_ap_dev *)&hd->hd_priv; |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 84 | } |
| 85 | |
Greg Kroah-Hartman | 1129973 | 2014-09-12 21:17:37 -0700 | [diff] [blame] | 86 | static void cport_out_callback(struct urb *urb); |
| 87 | |
Greg Kroah-Hartman | f1eec30 | 2014-08-30 17:18:14 -0700 | [diff] [blame] | 88 | /* |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 89 | * Allocate the actual buffer for this gbuf and device and cport |
| 90 | * |
| 91 | * We are responsible for setting the following fields in a struct gbuf: |
| 92 | * void *hcpriv; |
| 93 | * void *transfer_buffer; |
| 94 | * u32 transfer_buffer_length; |
Greg Kroah-Hartman | f1eec30 | 2014-08-30 17:18:14 -0700 | [diff] [blame] | 95 | */ |
Alex Elder | 9a6f631 | 2014-10-06 06:53:11 -0500 | [diff] [blame] | 96 | static int alloc_gbuf_data(struct gbuf *gbuf, unsigned int size, |
| 97 | gfp_t gfp_mask) |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 98 | { |
Alex Elder | 9a6f631 | 2014-10-06 06:53:11 -0500 | [diff] [blame] | 99 | u32 cport_reserve = gbuf->outbound ? 1 : 0; |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 100 | u8 *buffer; |
| 101 | |
Greg Kroah-Hartman | 29f000f | 2014-09-19 18:37:44 -0700 | [diff] [blame] | 102 | if (size > ES1_GBUF_MSG_SIZE) { |
Greg Kroah-Hartman | f036e05 | 2014-09-19 19:13:33 -0700 | [diff] [blame] | 103 | pr_err("guf was asked to be bigger than %ld!\n", |
Greg Kroah-Hartman | 29f000f | 2014-09-19 18:37:44 -0700 | [diff] [blame] | 104 | ES1_GBUF_MSG_SIZE); |
| 105 | } |
| 106 | |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 107 | /* For ES2 we need to figure out what cport is going to what endpoint, |
| 108 | * but for ES1, it's so dirt simple, we don't have a choice... |
| 109 | * |
| 110 | * Also, do a "slow" allocation now, if we need speed, use a cache |
Alex Elder | 9a6f631 | 2014-10-06 06:53:11 -0500 | [diff] [blame] | 111 | * |
| 112 | * For ES1 outbound buffers need to insert their target |
| 113 | * CPort Id before the data; set aside an extra byte for |
| 114 | * that purpose in that case. |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 115 | */ |
Alex Elder | a7901d5 | 2014-10-16 06:35:28 -0500 | [diff] [blame] | 116 | buffer = kzalloc(cport_reserve + size, gfp_mask); |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 117 | if (!buffer) |
| 118 | return -ENOMEM; |
| 119 | |
| 120 | /* |
| 121 | * we will encode the cport number in the first byte of the buffer, so |
| 122 | * set the second byte to be the "transfer buffer" |
| 123 | */ |
Alex Elder | 6eb3f4b | 2014-10-06 06:53:10 -0500 | [diff] [blame] | 124 | if (gbuf->connection->interface_cport_id > (u16)U8_MAX) { |
| 125 | pr_err("gbuf->interface_cport_id (%hd) is out of range!\n", |
| 126 | gbuf->connection->interface_cport_id); |
Greg Kroah-Hartman | a6cdb34 | 2014-09-30 18:21:36 -0700 | [diff] [blame] | 127 | kfree(buffer); |
| 128 | return -EINVAL; |
| 129 | } |
| 130 | |
Alex Elder | 9a6f631 | 2014-10-06 06:53:11 -0500 | [diff] [blame] | 131 | /* Insert the cport id for outbound buffers */ |
| 132 | if (gbuf->outbound) |
| 133 | *buffer++ = gbuf->connection->interface_cport_id; |
| 134 | gbuf->transfer_buffer = buffer; |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 135 | gbuf->transfer_buffer_length = size; |
| 136 | |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 137 | return 0; |
| 138 | } |
| 139 | |
| 140 | /* Free the memory we allocated with a gbuf */ |
Greg Kroah-Hartman | 3e7736e | 2014-09-21 17:34:28 -0700 | [diff] [blame] | 141 | static void free_gbuf_data(struct gbuf *gbuf) |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 142 | { |
Alex Elder | 9a6f631 | 2014-10-06 06:53:11 -0500 | [diff] [blame] | 143 | u8 *transfer_buffer = gbuf->transfer_buffer; |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 144 | |
Greg Kroah-Hartman | 3e7736e | 2014-09-21 17:34:28 -0700 | [diff] [blame] | 145 | /* Can be called with a NULL transfer_buffer on some error paths */ |
Alex Elder | 9a6f631 | 2014-10-06 06:53:11 -0500 | [diff] [blame] | 146 | if (!transfer_buffer) |
| 147 | return; |
| 148 | |
| 149 | if (gbuf->outbound) |
| 150 | transfer_buffer--; /* Back up to cport id */ |
| 151 | kfree(transfer_buffer); |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 152 | } |
| 153 | |
Greg Kroah-Hartman | 8c53e07 | 2014-09-12 20:47:11 -0700 | [diff] [blame] | 154 | #define ES1_TIMEOUT 500 /* 500 ms for the SVC to do something */ |
Alex Elder | 0db32a6 | 2014-09-24 05:16:14 -0500 | [diff] [blame] | 155 | static int submit_svc(struct svc_msg *svc_msg, struct greybus_host_device *hd) |
Greg Kroah-Hartman | 68f1fc4 | 2014-09-07 13:12:11 -0700 | [diff] [blame] | 156 | { |
| 157 | struct es1_ap_dev *es1 = hd_to_es1(hd); |
Greg Kroah-Hartman | 8c53e07 | 2014-09-12 20:47:11 -0700 | [diff] [blame] | 158 | int retval; |
Greg Kroah-Hartman | 68f1fc4 | 2014-09-07 13:12:11 -0700 | [diff] [blame] | 159 | |
Greg Kroah-Hartman | 8c53e07 | 2014-09-12 20:47:11 -0700 | [diff] [blame] | 160 | /* SVC messages go down our control pipe */ |
| 161 | retval = usb_control_msg(es1->usb_dev, |
| 162 | usb_sndctrlpipe(es1->usb_dev, |
| 163 | es1->control_endpoint), |
| 164 | 0x01, /* vendor request AP message */ |
Matt Porter | 648cb6c | 2014-09-22 15:51:48 -0400 | [diff] [blame] | 165 | USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE, |
Greg Kroah-Hartman | 8c53e07 | 2014-09-12 20:47:11 -0700 | [diff] [blame] | 166 | 0x00, 0x00, |
| 167 | (char *)svc_msg, |
| 168 | sizeof(*svc_msg), |
| 169 | ES1_TIMEOUT); |
| 170 | if (retval != sizeof(*svc_msg)) |
| 171 | return retval; |
| 172 | |
| 173 | return 0; |
Greg Kroah-Hartman | 68f1fc4 | 2014-09-07 13:12:11 -0700 | [diff] [blame] | 174 | } |
| 175 | |
Greg Kroah-Hartman | 0dad95d | 2014-09-13 09:54:35 -0700 | [diff] [blame] | 176 | static struct urb *next_free_urb(struct es1_ap_dev *es1, gfp_t gfp_mask) |
Greg Kroah-Hartman | 1129973 | 2014-09-12 21:17:37 -0700 | [diff] [blame] | 177 | { |
Greg Kroah-Hartman | 0dad95d | 2014-09-13 09:54:35 -0700 | [diff] [blame] | 178 | struct urb *urb = NULL; |
| 179 | unsigned long flags; |
| 180 | int i; |
| 181 | |
| 182 | spin_lock_irqsave(&es1->cport_out_urb_lock, flags); |
| 183 | |
| 184 | /* Look in our pool of allocated urbs first, as that's the "fastest" */ |
| 185 | for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { |
| 186 | if (es1->cport_out_urb_busy[i] == false) { |
| 187 | es1->cport_out_urb_busy[i] = true; |
| 188 | urb = es1->cport_out_urb[i]; |
| 189 | break; |
| 190 | } |
| 191 | } |
| 192 | spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags); |
| 193 | if (urb) |
| 194 | return urb; |
| 195 | |
| 196 | /* |
| 197 | * Crap, pool is empty, complain to the syslog and go allocate one |
| 198 | * dynamically as we have to succeed. |
| 199 | */ |
| 200 | dev_err(&es1->usb_dev->dev, |
| 201 | "No free CPort OUT urbs, having to dynamically allocate one!\n"); |
| 202 | urb = usb_alloc_urb(0, gfp_mask); |
| 203 | if (!urb) |
| 204 | return NULL; |
| 205 | |
| 206 | return urb; |
Greg Kroah-Hartman | 1129973 | 2014-09-12 21:17:37 -0700 | [diff] [blame] | 207 | } |
| 208 | |
Alex Elder | 61418b9 | 2014-10-16 06:35:29 -0500 | [diff] [blame] | 209 | static int submit_gbuf(struct gbuf *gbuf, gfp_t gfp_mask) |
Greg Kroah-Hartman | 1129973 | 2014-09-12 21:17:37 -0700 | [diff] [blame] | 210 | { |
Alex Elder | 61418b9 | 2014-10-16 06:35:29 -0500 | [diff] [blame] | 211 | struct greybus_host_device *hd = gbuf->connection->hd; |
Greg Kroah-Hartman | 1129973 | 2014-09-12 21:17:37 -0700 | [diff] [blame] | 212 | struct es1_ap_dev *es1 = hd_to_es1(hd); |
| 213 | struct usb_device *udev = es1->usb_dev; |
| 214 | int retval; |
| 215 | u8 *transfer_buffer; |
| 216 | u8 *buffer; |
| 217 | struct urb *urb; |
| 218 | |
| 219 | transfer_buffer = gbuf->transfer_buffer; |
| 220 | buffer = &transfer_buffer[-1]; /* yes, we mean -1 */ |
| 221 | |
| 222 | /* Find a free urb */ |
Greg Kroah-Hartman | 0dad95d | 2014-09-13 09:54:35 -0700 | [diff] [blame] | 223 | urb = next_free_urb(es1, gfp_mask); |
Greg Kroah-Hartman | 1129973 | 2014-09-12 21:17:37 -0700 | [diff] [blame] | 224 | if (!urb) |
| 225 | return -ENOMEM; |
| 226 | |
| 227 | usb_fill_bulk_urb(urb, udev, |
| 228 | usb_sndbulkpipe(udev, es1->cport_out_endpoint), |
| 229 | buffer, gbuf->transfer_buffer_length + 1, |
| 230 | cport_out_callback, gbuf); |
| 231 | retval = usb_submit_urb(urb, gfp_mask); |
| 232 | return retval; |
| 233 | } |
| 234 | |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 235 | static struct greybus_host_driver es1_driver = { |
Greg Kroah-Hartman | 3e7736e | 2014-09-21 17:34:28 -0700 | [diff] [blame] | 236 | .hd_priv_size = sizeof(struct es1_ap_dev), |
| 237 | .alloc_gbuf_data = alloc_gbuf_data, |
| 238 | .free_gbuf_data = free_gbuf_data, |
Alex Elder | 0db32a6 | 2014-09-24 05:16:14 -0500 | [diff] [blame] | 239 | .submit_svc = submit_svc, |
Greg Kroah-Hartman | 3e7736e | 2014-09-21 17:34:28 -0700 | [diff] [blame] | 240 | .submit_gbuf = submit_gbuf, |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 241 | }; |
| 242 | |
Alex Elder | 877b1ee | 2014-09-24 05:16:13 -0500 | [diff] [blame] | 243 | /* Common function to report consistent warnings based on URB status */ |
| 244 | static int check_urb_status(struct urb *urb) |
Greg Kroah-Hartman | de536e3 | 2014-08-31 16:17:04 -0700 | [diff] [blame] | 245 | { |
| 246 | struct device *dev = &urb->dev->dev; |
| 247 | int status = urb->status; |
Greg Kroah-Hartman | de536e3 | 2014-08-31 16:17:04 -0700 | [diff] [blame] | 248 | |
| 249 | switch (status) { |
| 250 | case 0: |
Alex Elder | 877b1ee | 2014-09-24 05:16:13 -0500 | [diff] [blame] | 251 | return 0; |
| 252 | |
Greg Kroah-Hartman | de536e3 | 2014-08-31 16:17:04 -0700 | [diff] [blame] | 253 | case -EOVERFLOW: |
| 254 | dev_err(dev, "%s: overflow actual length is %d\n", |
| 255 | __func__, urb->actual_length); |
| 256 | case -ECONNRESET: |
| 257 | case -ENOENT: |
| 258 | case -ESHUTDOWN: |
| 259 | case -EILSEQ: |
Matt Porter | 8fd39e3 | 2014-10-13 03:00:53 -0400 | [diff] [blame] | 260 | case -EPROTO: |
Greg Kroah-Hartman | de536e3 | 2014-08-31 16:17:04 -0700 | [diff] [blame] | 261 | /* device is gone, stop sending */ |
Alex Elder | 877b1ee | 2014-09-24 05:16:13 -0500 | [diff] [blame] | 262 | return status; |
Greg Kroah-Hartman | de536e3 | 2014-08-31 16:17:04 -0700 | [diff] [blame] | 263 | } |
Alex Elder | 877b1ee | 2014-09-24 05:16:13 -0500 | [diff] [blame] | 264 | dev_err(dev, "%s: unknown status %d\n", __func__, status); |
| 265 | |
| 266 | return -EAGAIN; |
| 267 | } |
| 268 | |
| 269 | /* Callback for when we get a SVC message */ |
| 270 | static void svc_in_callback(struct urb *urb) |
| 271 | { |
| 272 | struct es1_ap_dev *es1 = urb->context; |
| 273 | struct device *dev = &urb->dev->dev; |
| 274 | int status = check_urb_status(urb); |
| 275 | int retval; |
| 276 | |
| 277 | if (status == -EAGAIN) |
| 278 | goto exit; |
| 279 | if (status) |
| 280 | return; |
Greg Kroah-Hartman | de536e3 | 2014-08-31 16:17:04 -0700 | [diff] [blame] | 281 | |
| 282 | /* We have a message, create a new message structure, add it to the |
| 283 | * list, and wake up our thread that will process the messages. |
| 284 | */ |
Alex Elder | 51c75fd | 2014-09-26 20:55:35 -0500 | [diff] [blame] | 285 | greybus_svc_in(es1->hd, urb->transfer_buffer, urb->actual_length); |
Greg Kroah-Hartman | de536e3 | 2014-08-31 16:17:04 -0700 | [diff] [blame] | 286 | |
| 287 | exit: |
| 288 | /* resubmit the urb to get more messages */ |
| 289 | retval = usb_submit_urb(urb, GFP_ATOMIC); |
| 290 | if (retval) |
| 291 | dev_err(dev, "Can not submit urb for AP data: %d\n", retval); |
| 292 | } |
| 293 | |
Greg Kroah-Hartman | 1129973 | 2014-09-12 21:17:37 -0700 | [diff] [blame] | 294 | static void cport_in_callback(struct urb *urb) |
Greg Kroah-Hartman | de536e3 | 2014-08-31 16:17:04 -0700 | [diff] [blame] | 295 | { |
| 296 | struct device *dev = &urb->dev->dev; |
Greg Kroah-Hartman | 9c8d3af | 2014-09-13 11:09:35 -0700 | [diff] [blame] | 297 | struct es1_ap_dev *es1 = urb->context; |
Alex Elder | 877b1ee | 2014-09-24 05:16:13 -0500 | [diff] [blame] | 298 | int status = check_urb_status(urb); |
Greg Kroah-Hartman | 9c8d3af | 2014-09-13 11:09:35 -0700 | [diff] [blame] | 299 | int retval; |
| 300 | u8 cport; |
| 301 | u8 *data; |
Greg Kroah-Hartman | de536e3 | 2014-08-31 16:17:04 -0700 | [diff] [blame] | 302 | |
Alex Elder | 877b1ee | 2014-09-24 05:16:13 -0500 | [diff] [blame] | 303 | if (status == -EAGAIN) |
Greg Kroah-Hartman | de536e3 | 2014-08-31 16:17:04 -0700 | [diff] [blame] | 304 | goto exit; |
Alex Elder | 877b1ee | 2014-09-24 05:16:13 -0500 | [diff] [blame] | 305 | if (status) |
| 306 | return; |
Greg Kroah-Hartman | de536e3 | 2014-08-31 16:17:04 -0700 | [diff] [blame] | 307 | |
Alex Elder | 170229d | 2014-10-16 06:35:27 -0500 | [diff] [blame] | 308 | /* The size has to be at least one, for the cport id */ |
| 309 | if (!urb->actual_length) { |
| 310 | dev_err(dev, "%s: no cport id in input buffer?\n", __func__); |
Greg Kroah-Hartman | 9c8d3af | 2014-09-13 11:09:35 -0700 | [diff] [blame] | 311 | goto exit; |
| 312 | } |
| 313 | |
| 314 | /* |
| 315 | * The CPort number is the first byte of the data stream, the rest of |
| 316 | * the stream is "real" data |
| 317 | */ |
| 318 | data = urb->transfer_buffer; |
| 319 | cport = data[0]; |
| 320 | data = &data[1]; |
| 321 | |
| 322 | /* Pass this data to the greybus core */ |
Alex Elder | 0db32a6 | 2014-09-24 05:16:14 -0500 | [diff] [blame] | 323 | greybus_cport_in(es1->hd, cport, data, urb->actual_length - 1); |
Greg Kroah-Hartman | 9c8d3af | 2014-09-13 11:09:35 -0700 | [diff] [blame] | 324 | |
Greg Kroah-Hartman | de536e3 | 2014-08-31 16:17:04 -0700 | [diff] [blame] | 325 | exit: |
Greg Kroah-Hartman | 9c8d3af | 2014-09-13 11:09:35 -0700 | [diff] [blame] | 326 | /* put our urb back in the request pool */ |
| 327 | retval = usb_submit_urb(urb, GFP_ATOMIC); |
| 328 | if (retval) |
| 329 | dev_err(dev, "%s: error %d in submitting urb.\n", |
| 330 | __func__, retval); |
Greg Kroah-Hartman | de536e3 | 2014-08-31 16:17:04 -0700 | [diff] [blame] | 331 | } |
| 332 | |
Greg Kroah-Hartman | 1129973 | 2014-09-12 21:17:37 -0700 | [diff] [blame] | 333 | static void cport_out_callback(struct urb *urb) |
Greg Kroah-Hartman | 47f6ef1 | 2014-09-08 20:09:08 -0700 | [diff] [blame] | 334 | { |
Greg Kroah-Hartman | 9c8d3af | 2014-09-13 11:09:35 -0700 | [diff] [blame] | 335 | struct gbuf *gbuf = urb->context; |
Alex Elder | e8caf9a | 2014-10-06 06:53:13 -0500 | [diff] [blame] | 336 | struct es1_ap_dev *es1 = hd_to_es1(gbuf->connection->hd); |
Greg Kroah-Hartman | 9c8d3af | 2014-09-13 11:09:35 -0700 | [diff] [blame] | 337 | unsigned long flags; |
Greg Kroah-Hartman | 9c8d3af | 2014-09-13 11:09:35 -0700 | [diff] [blame] | 338 | int i; |
Greg Kroah-Hartman | ba4468d4 | 2014-08-30 17:06:54 -0700 | [diff] [blame] | 339 | |
Greg Kroah-Hartman | 9c8d3af | 2014-09-13 11:09:35 -0700 | [diff] [blame] | 340 | /* |
Greg Kroah-Hartman | 7f9e05e | 2014-09-13 17:28:33 -0700 | [diff] [blame] | 341 | * See if this was an urb in our pool, if so mark it "free", otherwise |
| 342 | * we need to free it ourselves. |
Greg Kroah-Hartman | 9c8d3af | 2014-09-13 11:09:35 -0700 | [diff] [blame] | 343 | */ |
| 344 | spin_lock_irqsave(&es1->cport_out_urb_lock, flags); |
| 345 | for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { |
| 346 | if (urb == es1->cport_out_urb[i]) { |
| 347 | es1->cport_out_urb_busy[i] = false; |
| 348 | urb = NULL; |
| 349 | break; |
| 350 | } |
| 351 | } |
| 352 | spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags); |
Greg Kroah-Hartman | 9c8d3af | 2014-09-13 11:09:35 -0700 | [diff] [blame] | 353 | |
Greg Kroah-Hartman | 7f9e05e | 2014-09-13 17:28:33 -0700 | [diff] [blame] | 354 | /* If urb is not NULL, then we need to free this urb */ |
| 355 | usb_free_urb(urb); |
Greg Kroah-Hartman | 47f6ef1 | 2014-09-08 20:09:08 -0700 | [diff] [blame] | 356 | } |
| 357 | |
| 358 | /* |
| 359 | * The ES1 USB Bridge device contains 4 endpoints |
| 360 | * 1 Control - usual USB stuff + AP -> SVC messages |
| 361 | * 1 Interrupt IN - SVC -> AP messages |
| 362 | * 1 Bulk IN - CPort data in |
Alex Elder | 69f93ab | 2014-09-22 18:53:02 -0500 | [diff] [blame] | 363 | * 1 Bulk OUT - CPort data out |
Greg Kroah-Hartman | 47f6ef1 | 2014-09-08 20:09:08 -0700 | [diff] [blame] | 364 | */ |
Greg Kroah-Hartman | ba4468d4 | 2014-08-30 17:06:54 -0700 | [diff] [blame] | 365 | static int ap_probe(struct usb_interface *interface, |
| 366 | const struct usb_device_id *id) |
| 367 | { |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 368 | struct es1_ap_dev *es1; |
| 369 | struct greybus_host_device *hd; |
| 370 | struct usb_device *udev; |
Greg Kroah-Hartman | 6f83ab7 | 2014-08-30 17:30:04 -0700 | [diff] [blame] | 371 | struct usb_host_interface *iface_desc; |
| 372 | struct usb_endpoint_descriptor *endpoint; |
Greg Kroah-Hartman | 47f6ef1 | 2014-09-08 20:09:08 -0700 | [diff] [blame] | 373 | bool int_in_found = false; |
| 374 | bool bulk_in_found = false; |
| 375 | bool bulk_out_found = false; |
| 376 | int retval = -ENOMEM; |
Greg Kroah-Hartman | 6f83ab7 | 2014-08-30 17:30:04 -0700 | [diff] [blame] | 377 | int i; |
Greg Kroah-Hartman | 47f6ef1 | 2014-09-08 20:09:08 -0700 | [diff] [blame] | 378 | u8 svc_interval = 0; |
Greg Kroah-Hartman | 6f83ab7 | 2014-08-30 17:30:04 -0700 | [diff] [blame] | 379 | |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 380 | udev = usb_get_dev(interface_to_usbdev(interface)); |
| 381 | |
| 382 | hd = greybus_create_hd(&es1_driver, &udev->dev); |
| 383 | if (!hd) |
Greg Kroah-Hartman | f1eec30 | 2014-08-30 17:18:14 -0700 | [diff] [blame] | 384 | return -ENOMEM; |
Greg Kroah-Hartman | ba4468d4 | 2014-08-30 17:06:54 -0700 | [diff] [blame] | 385 | |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 386 | es1 = hd_to_es1(hd); |
| 387 | es1->hd = hd; |
Greg Kroah-Hartman | 47f6ef1 | 2014-09-08 20:09:08 -0700 | [diff] [blame] | 388 | es1->usb_intf = interface; |
| 389 | es1->usb_dev = udev; |
Greg Kroah-Hartman | 0dad95d | 2014-09-13 09:54:35 -0700 | [diff] [blame] | 390 | spin_lock_init(&es1->cport_out_urb_lock); |
Greg Kroah-Hartman | 47f6ef1 | 2014-09-08 20:09:08 -0700 | [diff] [blame] | 391 | usb_set_intfdata(interface, es1); |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 392 | |
| 393 | /* Control endpoint is the pipe to talk to this AP, so save it off */ |
| 394 | endpoint = &udev->ep0.desc; |
Greg Kroah-Hartman | 47f6ef1 | 2014-09-08 20:09:08 -0700 | [diff] [blame] | 395 | es1->control_endpoint = endpoint->bEndpointAddress; |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 396 | |
Greg Kroah-Hartman | 47f6ef1 | 2014-09-08 20:09:08 -0700 | [diff] [blame] | 397 | /* find all 3 of our endpoints */ |
Greg Kroah-Hartman | 6f83ab7 | 2014-08-30 17:30:04 -0700 | [diff] [blame] | 398 | iface_desc = interface->cur_altsetting; |
| 399 | for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { |
| 400 | endpoint = &iface_desc->endpoint[i].desc; |
| 401 | |
Greg Kroah-Hartman | 47f6ef1 | 2014-09-08 20:09:08 -0700 | [diff] [blame] | 402 | if (usb_endpoint_is_int_in(endpoint)) { |
| 403 | es1->svc_endpoint = endpoint->bEndpointAddress; |
Greg Kroah-Hartman | 47f6ef1 | 2014-09-08 20:09:08 -0700 | [diff] [blame] | 404 | svc_interval = endpoint->bInterval; |
| 405 | int_in_found = true; |
| 406 | } else if (usb_endpoint_is_bulk_in(endpoint)) { |
| 407 | es1->cport_in_endpoint = endpoint->bEndpointAddress; |
| 408 | bulk_in_found = true; |
| 409 | } else if (usb_endpoint_is_bulk_out(endpoint)) { |
| 410 | es1->cport_out_endpoint = endpoint->bEndpointAddress; |
| 411 | bulk_out_found = true; |
| 412 | } else { |
| 413 | dev_err(&udev->dev, |
| 414 | "Unknown endpoint type found, address %x\n", |
| 415 | endpoint->bEndpointAddress); |
Greg Kroah-Hartman | 6f83ab7 | 2014-08-30 17:30:04 -0700 | [diff] [blame] | 416 | } |
Greg Kroah-Hartman | 47f6ef1 | 2014-09-08 20:09:08 -0700 | [diff] [blame] | 417 | } |
| 418 | if ((int_in_found == false) || |
| 419 | (bulk_in_found == false) || |
| 420 | (bulk_out_found == false)) { |
| 421 | dev_err(&udev->dev, "Not enough endpoints found in device, aborting!\n"); |
| 422 | goto error; |
Greg Kroah-Hartman | 6f83ab7 | 2014-08-30 17:30:04 -0700 | [diff] [blame] | 423 | } |
| 424 | |
Greg Kroah-Hartman | 47f6ef1 | 2014-09-08 20:09:08 -0700 | [diff] [blame] | 425 | /* Create our buffer and URB to get SVC messages, and start it up */ |
Greg Kroah-Hartman | 29f000f | 2014-09-19 18:37:44 -0700 | [diff] [blame] | 426 | es1->svc_buffer = kmalloc(ES1_SVC_MSG_SIZE, GFP_KERNEL); |
Greg Kroah-Hartman | 47f6ef1 | 2014-09-08 20:09:08 -0700 | [diff] [blame] | 427 | if (!es1->svc_buffer) |
| 428 | goto error; |
Greg Kroah-Hartman | 6f83ab7 | 2014-08-30 17:30:04 -0700 | [diff] [blame] | 429 | |
Greg Kroah-Hartman | 47f6ef1 | 2014-09-08 20:09:08 -0700 | [diff] [blame] | 430 | es1->svc_urb = usb_alloc_urb(0, GFP_KERNEL); |
| 431 | if (!es1->svc_urb) |
Greg Kroah-Hartman | 1129973 | 2014-09-12 21:17:37 -0700 | [diff] [blame] | 432 | goto error_int_urb; |
Greg Kroah-Hartman | 47f6ef1 | 2014-09-08 20:09:08 -0700 | [diff] [blame] | 433 | |
| 434 | usb_fill_int_urb(es1->svc_urb, udev, |
| 435 | usb_rcvintpipe(udev, es1->svc_endpoint), |
Alex Elder | 877b1ee | 2014-09-24 05:16:13 -0500 | [diff] [blame] | 436 | es1->svc_buffer, ES1_SVC_MSG_SIZE, svc_in_callback, |
Greg Kroah-Hartman | 47f6ef1 | 2014-09-08 20:09:08 -0700 | [diff] [blame] | 437 | es1, svc_interval); |
| 438 | retval = usb_submit_urb(es1->svc_urb, GFP_KERNEL); |
| 439 | if (retval) |
| 440 | goto error_submit_urb; |
| 441 | |
Greg Kroah-Hartman | 1129973 | 2014-09-12 21:17:37 -0700 | [diff] [blame] | 442 | /* Allocate buffers for our cport in messages and start them up */ |
| 443 | for (i = 0; i < NUM_CPORT_IN_URB; ++i) { |
| 444 | struct urb *urb; |
| 445 | u8 *buffer; |
| 446 | |
| 447 | urb = usb_alloc_urb(0, GFP_KERNEL); |
| 448 | if (!urb) |
| 449 | goto error_bulk_in_urb; |
Greg Kroah-Hartman | 29f000f | 2014-09-19 18:37:44 -0700 | [diff] [blame] | 450 | buffer = kmalloc(ES1_GBUF_MSG_SIZE, GFP_KERNEL); |
Greg Kroah-Hartman | 1129973 | 2014-09-12 21:17:37 -0700 | [diff] [blame] | 451 | if (!buffer) |
| 452 | goto error_bulk_in_urb; |
| 453 | |
| 454 | usb_fill_bulk_urb(urb, udev, |
| 455 | usb_rcvbulkpipe(udev, es1->cport_in_endpoint), |
| 456 | buffer, PAGE_SIZE, cport_in_callback, es1); |
| 457 | es1->cport_in_urb[i] = urb; |
| 458 | es1->cport_in_buffer[i] = buffer; |
| 459 | retval = usb_submit_urb(urb, GFP_KERNEL); |
| 460 | if (retval) |
| 461 | goto error_bulk_in_urb; |
| 462 | } |
| 463 | |
| 464 | /* Allocate urbs for our CPort OUT messages */ |
| 465 | for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { |
| 466 | struct urb *urb; |
| 467 | |
| 468 | urb = usb_alloc_urb(0, GFP_KERNEL); |
| 469 | if (!urb) |
| 470 | goto error_bulk_out_urb; |
| 471 | |
| 472 | es1->cport_out_urb[i] = urb; |
| 473 | es1->cport_out_urb_busy[i] = false; /* just to be anal */ |
| 474 | } |
| 475 | |
Greg Kroah-Hartman | ba4468d4 | 2014-08-30 17:06:54 -0700 | [diff] [blame] | 476 | return 0; |
Greg Kroah-Hartman | 47f6ef1 | 2014-09-08 20:09:08 -0700 | [diff] [blame] | 477 | |
Greg Kroah-Hartman | 1129973 | 2014-09-12 21:17:37 -0700 | [diff] [blame] | 478 | error_bulk_out_urb: |
| 479 | for (i = 0; i < NUM_CPORT_OUT_URB; ++i) |
| 480 | usb_free_urb(es1->cport_out_urb[i]); |
| 481 | |
| 482 | error_bulk_in_urb: |
| 483 | for (i = 0; i < NUM_CPORT_IN_URB; ++i) { |
| 484 | usb_kill_urb(es1->cport_in_urb[i]); |
| 485 | usb_free_urb(es1->cport_in_urb[i]); |
| 486 | kfree(es1->cport_in_buffer[i]); |
| 487 | } |
| 488 | |
Greg Kroah-Hartman | 47f6ef1 | 2014-09-08 20:09:08 -0700 | [diff] [blame] | 489 | error_submit_urb: |
| 490 | usb_free_urb(es1->svc_urb); |
Greg Kroah-Hartman | 1129973 | 2014-09-12 21:17:37 -0700 | [diff] [blame] | 491 | error_int_urb: |
Greg Kroah-Hartman | 47f6ef1 | 2014-09-08 20:09:08 -0700 | [diff] [blame] | 492 | kfree(es1->svc_buffer); |
| 493 | error: |
| 494 | greybus_remove_hd(es1->hd); |
| 495 | return retval; |
Greg Kroah-Hartman | ba4468d4 | 2014-08-30 17:06:54 -0700 | [diff] [blame] | 496 | } |
| 497 | |
| 498 | static void ap_disconnect(struct usb_interface *interface) |
| 499 | { |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 500 | struct es1_ap_dev *es1; |
Greg Kroah-Hartman | 1129973 | 2014-09-12 21:17:37 -0700 | [diff] [blame] | 501 | int i; |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 502 | |
| 503 | es1 = usb_get_intfdata(interface); |
Greg Kroah-Hartman | 1129973 | 2014-09-12 21:17:37 -0700 | [diff] [blame] | 504 | if (!es1) |
| 505 | return; |
Greg Kroah-Hartman | ba4468d4 | 2014-08-30 17:06:54 -0700 | [diff] [blame] | 506 | |
Greg Kroah-Hartman | f1eec30 | 2014-08-30 17:18:14 -0700 | [diff] [blame] | 507 | /* Tear down everything! */ |
Greg Kroah-Hartman | 1129973 | 2014-09-12 21:17:37 -0700 | [diff] [blame] | 508 | for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { |
| 509 | usb_kill_urb(es1->cport_out_urb[i]); |
| 510 | usb_free_urb(es1->cport_out_urb[i]); |
| 511 | } |
| 512 | |
| 513 | for (i = 0; i < NUM_CPORT_IN_URB; ++i) { |
| 514 | usb_kill_urb(es1->cport_in_urb[i]); |
| 515 | usb_free_urb(es1->cport_in_urb[i]); |
| 516 | kfree(es1->cport_in_buffer[i]); |
| 517 | } |
| 518 | |
Greg Kroah-Hartman | 47f6ef1 | 2014-09-08 20:09:08 -0700 | [diff] [blame] | 519 | usb_kill_urb(es1->svc_urb); |
Greg Kroah-Hartman | d9d077f | 2014-09-08 20:11:18 -0700 | [diff] [blame] | 520 | usb_free_urb(es1->svc_urb); |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 521 | usb_put_dev(es1->usb_dev); |
Greg Kroah-Hartman | 47f6ef1 | 2014-09-08 20:09:08 -0700 | [diff] [blame] | 522 | kfree(es1->svc_buffer); |
Greg Kroah-Hartman | 68f1fc4 | 2014-09-07 13:12:11 -0700 | [diff] [blame] | 523 | greybus_remove_hd(es1->hd); |
Greg Kroah-Hartman | 47f6ef1 | 2014-09-08 20:09:08 -0700 | [diff] [blame] | 524 | usb_set_intfdata(interface, NULL); |
Greg Kroah-Hartman | ba4468d4 | 2014-08-30 17:06:54 -0700 | [diff] [blame] | 525 | } |
| 526 | |
| 527 | static struct usb_driver es1_ap_driver = { |
| 528 | .name = "es1_ap_driver", |
| 529 | .probe = ap_probe, |
| 530 | .disconnect = ap_disconnect, |
| 531 | .id_table = id_table, |
| 532 | }; |
| 533 | |
| 534 | module_usb_driver(es1_ap_driver); |
| 535 | |
| 536 | MODULE_LICENSE("GPL"); |
| 537 | MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>"); |