Greg Kroah-Hartman | f587027 | 2015-01-21 10:24:15 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Greybus "AP" USB driver for "ES2" controller chips |
| 3 | * |
Alex Elder | 142f8dd | 2015-03-26 21:25:06 -0500 | [diff] [blame] | 4 | * Copyright 2014-2015 Google Inc. |
| 5 | * Copyright 2014-2015 Linaro Ltd. |
Greg Kroah-Hartman | f587027 | 2015-01-21 10:24:15 +0800 | [diff] [blame] | 6 | * |
| 7 | * Released under the GPLv2 only. |
| 8 | */ |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/slab.h> |
| 12 | #include <linux/errno.h> |
| 13 | #include <linux/sizes.h> |
| 14 | #include <linux/usb.h> |
| 15 | |
| 16 | #include "greybus.h" |
| 17 | #include "svc_msg.h" |
| 18 | #include "kernel_ver.h" |
| 19 | |
Greg Kroah-Hartman | f587027 | 2015-01-21 10:24:15 +0800 | [diff] [blame] | 20 | /* Memory sizes for the buffers sent to/from the ES1 controller */ |
| 21 | #define ES1_SVC_MSG_SIZE (sizeof(struct svc_msg) + SZ_64K) |
| 22 | #define ES1_GBUF_MSG_SIZE_MAX PAGE_SIZE |
| 23 | |
| 24 | static const struct usb_device_id id_table[] = { |
Greg Kroah-Hartman | 2bf4c87 | 2015-03-02 08:52:07 -0800 | [diff] [blame] | 25 | /* Made up numbers for the SVC USB Bridge in ES2 */ |
| 26 | { USB_DEVICE(0xffff, 0x0002) }, |
Greg Kroah-Hartman | f587027 | 2015-01-21 10:24:15 +0800 | [diff] [blame] | 27 | { }, |
| 28 | }; |
| 29 | MODULE_DEVICE_TABLE(usb, id_table); |
| 30 | |
| 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 | |
| 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 | */ |
| 61 | struct es1_ap_dev { |
| 62 | struct usb_device *usb_dev; |
| 63 | struct usb_interface *usb_intf; |
| 64 | struct greybus_host_device *hd; |
| 65 | |
| 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; |
| 79 | }; |
| 80 | |
| 81 | static inline struct es1_ap_dev *hd_to_es1(struct greybus_host_device *hd) |
| 82 | { |
| 83 | return (struct es1_ap_dev *)&hd->hd_priv; |
| 84 | } |
| 85 | |
| 86 | static void cport_out_callback(struct urb *urb); |
| 87 | |
| 88 | /* |
| 89 | * Buffer constraints for the host driver. |
| 90 | * |
| 91 | * A "buffer" is used to hold data to be transferred for Greybus by |
| 92 | * the host driver. A buffer is represented by a "buffer pointer", |
| 93 | * which defines a region of memory used by the host driver for |
| 94 | * transferring the data. When Greybus allocates a buffer, it must |
| 95 | * do so subject to the constraints associated with the host driver. |
| 96 | * These constraints are specified by two parameters: the |
| 97 | * headroom; and the maximum buffer size. |
| 98 | * |
| 99 | * +------------------+ |
| 100 | * | Host driver | \ |
| 101 | * | reserved area | }- headroom |
| 102 | * | . . . | / |
| 103 | * buffer pointer ---> +------------------+ |
| 104 | * | Buffer space for | \ |
| 105 | * | transferred data | }- buffer size |
| 106 | * | . . . | / (limited to size_max) |
| 107 | * +------------------+ |
| 108 | * |
| 109 | * headroom: Every buffer must have at least this much space |
| 110 | * *before* the buffer pointer, reserved for use by the |
| 111 | * host driver. I.e., ((char *)buffer - headroom) must |
| 112 | * point to valid memory, usable only by the host driver. |
| 113 | * size_max: The maximum size of a buffer (not including the |
| 114 | * headroom) must not exceed this. |
| 115 | */ |
| 116 | static void hd_buffer_constraints(struct greybus_host_device *hd) |
| 117 | { |
| 118 | /* |
| 119 | * Only one byte is required, but this produces a result |
| 120 | * that's better aligned for the user. |
| 121 | */ |
| 122 | hd->buffer_headroom = sizeof(u32); /* For cport id */ |
| 123 | hd->buffer_size_max = ES1_GBUF_MSG_SIZE_MAX; |
| 124 | BUILD_BUG_ON(hd->buffer_headroom > GB_BUFFER_HEADROOM_MAX); |
| 125 | } |
| 126 | |
| 127 | #define ES1_TIMEOUT 500 /* 500 ms for the SVC to do something */ |
| 128 | static int submit_svc(struct svc_msg *svc_msg, struct greybus_host_device *hd) |
| 129 | { |
| 130 | struct es1_ap_dev *es1 = hd_to_es1(hd); |
| 131 | int retval; |
| 132 | |
| 133 | /* SVC messages go down our control pipe */ |
| 134 | retval = usb_control_msg(es1->usb_dev, |
| 135 | usb_sndctrlpipe(es1->usb_dev, |
| 136 | es1->control_endpoint), |
| 137 | 0x01, /* vendor request AP message */ |
| 138 | USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE, |
| 139 | 0x00, 0x00, |
| 140 | (char *)svc_msg, |
| 141 | sizeof(*svc_msg), |
| 142 | ES1_TIMEOUT); |
| 143 | if (retval != sizeof(*svc_msg)) |
| 144 | return retval; |
| 145 | |
| 146 | return 0; |
| 147 | } |
| 148 | |
| 149 | static struct urb *next_free_urb(struct es1_ap_dev *es1, gfp_t gfp_mask) |
| 150 | { |
| 151 | struct urb *urb = NULL; |
| 152 | unsigned long flags; |
| 153 | int i; |
| 154 | |
| 155 | spin_lock_irqsave(&es1->cport_out_urb_lock, flags); |
| 156 | |
| 157 | /* Look in our pool of allocated urbs first, as that's the "fastest" */ |
| 158 | for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { |
| 159 | if (es1->cport_out_urb_busy[i] == false) { |
| 160 | es1->cport_out_urb_busy[i] = true; |
| 161 | urb = es1->cport_out_urb[i]; |
| 162 | break; |
| 163 | } |
| 164 | } |
| 165 | spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags); |
| 166 | if (urb) |
| 167 | return urb; |
| 168 | |
| 169 | /* |
| 170 | * Crap, pool is empty, complain to the syslog and go allocate one |
| 171 | * dynamically as we have to succeed. |
| 172 | */ |
| 173 | dev_err(&es1->usb_dev->dev, |
| 174 | "No free CPort OUT urbs, having to dynamically allocate one!\n"); |
| 175 | return usb_alloc_urb(0, gfp_mask); |
| 176 | } |
| 177 | |
| 178 | static void free_urb(struct es1_ap_dev *es1, struct urb *urb) |
| 179 | { |
| 180 | unsigned long flags; |
| 181 | int i; |
| 182 | /* |
| 183 | * See if this was an urb in our pool, if so mark it "free", otherwise |
| 184 | * we need to free it ourselves. |
| 185 | */ |
| 186 | spin_lock_irqsave(&es1->cport_out_urb_lock, flags); |
| 187 | for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { |
| 188 | if (urb == es1->cport_out_urb[i]) { |
| 189 | es1->cport_out_urb_busy[i] = false; |
| 190 | urb = NULL; |
| 191 | break; |
| 192 | } |
| 193 | } |
| 194 | spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags); |
| 195 | |
| 196 | /* If urb is not NULL, then we need to free this urb */ |
| 197 | usb_free_urb(urb); |
| 198 | } |
| 199 | |
| 200 | /* |
| 201 | * Returns an opaque cookie value if successful, or a pointer coded |
| 202 | * error otherwise. If the caller wishes to cancel the in-flight |
| 203 | * buffer, it must supply the returned cookie to the cancel routine. |
| 204 | */ |
| 205 | static void *buffer_send(struct greybus_host_device *hd, u16 cport_id, |
| 206 | void *buffer, size_t buffer_size, gfp_t gfp_mask) |
| 207 | { |
| 208 | struct es1_ap_dev *es1 = hd_to_es1(hd); |
| 209 | struct usb_device *udev = es1->usb_dev; |
| 210 | u8 *transfer_buffer = buffer; |
| 211 | int transfer_buffer_size; |
| 212 | int retval; |
| 213 | struct urb *urb; |
| 214 | |
| 215 | if (!buffer) { |
| 216 | pr_err("null buffer supplied to send\n"); |
| 217 | return ERR_PTR(-EINVAL); |
| 218 | } |
| 219 | if (buffer_size > (size_t)INT_MAX) { |
| 220 | pr_err("bad buffer size (%zu) supplied to send\n", buffer_size); |
| 221 | return ERR_PTR(-EINVAL); |
| 222 | } |
| 223 | transfer_buffer--; |
| 224 | transfer_buffer_size = buffer_size + 1; |
| 225 | |
| 226 | /* |
| 227 | * The data actually transferred will include an indication |
| 228 | * of where the data should be sent. Do one last check of |
| 229 | * the target CPort id before filling it in. |
| 230 | */ |
| 231 | if (cport_id == CPORT_ID_BAD) { |
| 232 | pr_err("request to send inbound data buffer\n"); |
| 233 | return ERR_PTR(-EINVAL); |
| 234 | } |
| 235 | if (cport_id > (u16)U8_MAX) { |
| 236 | pr_err("cport_id (%hd) is out of range for ES1\n", cport_id); |
| 237 | return ERR_PTR(-EINVAL); |
| 238 | } |
| 239 | /* OK, the destination is fine; record it in the transfer buffer */ |
| 240 | *transfer_buffer = cport_id; |
| 241 | |
| 242 | /* Find a free urb */ |
| 243 | urb = next_free_urb(es1, gfp_mask); |
| 244 | if (!urb) |
| 245 | return ERR_PTR(-ENOMEM); |
| 246 | |
| 247 | usb_fill_bulk_urb(urb, udev, |
| 248 | usb_sndbulkpipe(udev, es1->cport_out_endpoint), |
| 249 | transfer_buffer, transfer_buffer_size, |
| 250 | cport_out_callback, hd); |
| 251 | retval = usb_submit_urb(urb, gfp_mask); |
| 252 | if (retval) { |
| 253 | pr_err("error %d submitting URB\n", retval); |
| 254 | free_urb(es1, urb); |
| 255 | return ERR_PTR(retval); |
| 256 | } |
| 257 | |
Alex Elder | 142f8dd | 2015-03-26 21:25:06 -0500 | [diff] [blame] | 258 | return urb; |
Greg Kroah-Hartman | f587027 | 2015-01-21 10:24:15 +0800 | [diff] [blame] | 259 | } |
| 260 | |
| 261 | /* |
| 262 | * The cookie value supplied is the value that buffer_send() |
| 263 | * returned to its caller. It identifies the buffer that should be |
| 264 | * canceled. This function must also handle (which is to say, |
| 265 | * ignore) a null cookie value. |
| 266 | */ |
| 267 | static void buffer_cancel(void *cookie) |
| 268 | { |
| 269 | |
| 270 | /* |
| 271 | * We really should be defensive and track all outstanding |
| 272 | * (sent) buffers rather than trusting the cookie provided |
| 273 | * is valid. For the time being, this will do. |
| 274 | */ |
| 275 | if (cookie) |
Alex Elder | 142f8dd | 2015-03-26 21:25:06 -0500 | [diff] [blame] | 276 | usb_kill_urb(cookie); |
Greg Kroah-Hartman | f587027 | 2015-01-21 10:24:15 +0800 | [diff] [blame] | 277 | } |
| 278 | |
| 279 | static struct greybus_host_driver es1_driver = { |
| 280 | .hd_priv_size = sizeof(struct es1_ap_dev), |
| 281 | .buffer_send = buffer_send, |
| 282 | .buffer_cancel = buffer_cancel, |
| 283 | .submit_svc = submit_svc, |
| 284 | }; |
| 285 | |
| 286 | /* Common function to report consistent warnings based on URB status */ |
| 287 | static int check_urb_status(struct urb *urb) |
| 288 | { |
| 289 | struct device *dev = &urb->dev->dev; |
| 290 | int status = urb->status; |
| 291 | |
| 292 | switch (status) { |
| 293 | case 0: |
| 294 | return 0; |
| 295 | |
| 296 | case -EOVERFLOW: |
| 297 | dev_err(dev, "%s: overflow actual length is %d\n", |
| 298 | __func__, urb->actual_length); |
| 299 | case -ECONNRESET: |
| 300 | case -ENOENT: |
| 301 | case -ESHUTDOWN: |
| 302 | case -EILSEQ: |
| 303 | case -EPROTO: |
| 304 | /* device is gone, stop sending */ |
| 305 | return status; |
| 306 | } |
| 307 | dev_err(dev, "%s: unknown status %d\n", __func__, status); |
| 308 | |
| 309 | return -EAGAIN; |
| 310 | } |
| 311 | |
| 312 | static void ap_disconnect(struct usb_interface *interface) |
| 313 | { |
| 314 | struct es1_ap_dev *es1; |
| 315 | struct usb_device *udev; |
| 316 | int i; |
| 317 | |
| 318 | es1 = usb_get_intfdata(interface); |
| 319 | if (!es1) |
| 320 | return; |
| 321 | |
| 322 | /* Tear down everything! */ |
| 323 | for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { |
| 324 | struct urb *urb = es1->cport_out_urb[i]; |
| 325 | |
| 326 | if (!urb) |
| 327 | break; |
| 328 | usb_kill_urb(urb); |
| 329 | usb_free_urb(urb); |
| 330 | es1->cport_out_urb[i] = NULL; |
| 331 | es1->cport_out_urb_busy[i] = false; /* just to be anal */ |
| 332 | } |
| 333 | |
| 334 | for (i = 0; i < NUM_CPORT_IN_URB; ++i) { |
| 335 | struct urb *urb = es1->cport_in_urb[i]; |
| 336 | |
| 337 | if (!urb) |
| 338 | break; |
| 339 | usb_kill_urb(urb); |
| 340 | usb_free_urb(urb); |
| 341 | kfree(es1->cport_in_buffer[i]); |
| 342 | es1->cport_in_buffer[i] = NULL; |
| 343 | } |
| 344 | |
| 345 | usb_kill_urb(es1->svc_urb); |
| 346 | usb_free_urb(es1->svc_urb); |
| 347 | es1->svc_urb = NULL; |
| 348 | kfree(es1->svc_buffer); |
| 349 | es1->svc_buffer = NULL; |
| 350 | |
| 351 | usb_set_intfdata(interface, NULL); |
| 352 | udev = es1->usb_dev; |
| 353 | greybus_remove_hd(es1->hd); |
| 354 | |
| 355 | usb_put_dev(udev); |
| 356 | } |
| 357 | |
| 358 | /* Callback for when we get a SVC message */ |
| 359 | static void svc_in_callback(struct urb *urb) |
| 360 | { |
| 361 | struct greybus_host_device *hd = urb->context; |
| 362 | struct device *dev = &urb->dev->dev; |
| 363 | int status = check_urb_status(urb); |
| 364 | int retval; |
| 365 | |
| 366 | if (status) { |
| 367 | if ((status == -EAGAIN) || (status == -EPROTO)) |
| 368 | goto exit; |
| 369 | dev_err(dev, "urb svc in error %d (dropped)\n", status); |
| 370 | return; |
| 371 | } |
| 372 | |
| 373 | /* We have a message, create a new message structure, add it to the |
| 374 | * list, and wake up our thread that will process the messages. |
| 375 | */ |
| 376 | greybus_svc_in(hd, urb->transfer_buffer, urb->actual_length); |
| 377 | |
| 378 | exit: |
| 379 | /* resubmit the urb to get more messages */ |
| 380 | retval = usb_submit_urb(urb, GFP_ATOMIC); |
| 381 | if (retval) |
| 382 | dev_err(dev, "Can not submit urb for AP data: %d\n", retval); |
| 383 | } |
| 384 | |
| 385 | static void cport_in_callback(struct urb *urb) |
| 386 | { |
| 387 | struct greybus_host_device *hd = urb->context; |
| 388 | struct device *dev = &urb->dev->dev; |
| 389 | int status = check_urb_status(urb); |
| 390 | int retval; |
| 391 | u16 cport_id; |
| 392 | u8 *data; |
| 393 | |
| 394 | if (status) { |
| 395 | if ((status == -EAGAIN) || (status == -EPROTO)) |
| 396 | goto exit; |
| 397 | dev_err(dev, "urb cport in error %d (dropped)\n", status); |
| 398 | return; |
| 399 | } |
| 400 | |
| 401 | /* The size has to be at least one, for the cport id */ |
| 402 | if (!urb->actual_length) { |
| 403 | dev_err(dev, "%s: no cport id in input buffer?\n", __func__); |
| 404 | goto exit; |
| 405 | } |
| 406 | |
| 407 | /* |
| 408 | * Our CPort number is the first byte of the data stream, |
| 409 | * the rest of the stream is "real" data |
| 410 | */ |
| 411 | data = urb->transfer_buffer; |
| 412 | cport_id = (u16)data[0]; |
| 413 | data = &data[1]; |
| 414 | |
| 415 | /* Pass this data to the greybus core */ |
| 416 | greybus_data_rcvd(hd, cport_id, data, urb->actual_length - 1); |
| 417 | |
| 418 | exit: |
| 419 | /* put our urb back in the request pool */ |
| 420 | retval = usb_submit_urb(urb, GFP_ATOMIC); |
| 421 | if (retval) |
| 422 | dev_err(dev, "%s: error %d in submitting urb.\n", |
| 423 | __func__, retval); |
| 424 | } |
| 425 | |
| 426 | static void cport_out_callback(struct urb *urb) |
| 427 | { |
| 428 | struct greybus_host_device *hd = urb->context; |
| 429 | struct es1_ap_dev *es1 = hd_to_es1(hd); |
| 430 | int status = check_urb_status(urb); |
| 431 | u8 *data = urb->transfer_buffer + 1; |
| 432 | |
| 433 | /* |
| 434 | * Tell the submitter that the buffer send (attempt) is |
| 435 | * complete, and report the status. The submitter's buffer |
| 436 | * starts after the one-byte CPort id we inserted. |
| 437 | */ |
| 438 | data = urb->transfer_buffer + 1; |
| 439 | greybus_data_sent(hd, data, status); |
| 440 | |
| 441 | free_urb(es1, urb); |
| 442 | /* |
| 443 | * Rest assured Greg, this craziness is getting fixed. |
| 444 | * |
| 445 | * Yes, you are right, we aren't telling anyone that the urb finished. |
| 446 | * "That's crazy! How does this all even work?" you might be saying. |
| 447 | * The "magic" is the idea that greybus works on the "operation" level, |
| 448 | * not the "send a buffer" level. All operations are "round-trip" with |
| 449 | * a response from the device that the operation finished, or it will |
| 450 | * time out. Because of that, we don't care that this urb finished, or |
| 451 | * failed, or did anything else, as higher levels of the protocol stack |
| 452 | * will handle completions and timeouts and the rest. |
| 453 | * |
| 454 | * This protocol is "needed" due to some hardware restrictions on the |
| 455 | * current generation of Unipro controllers. Think about it for a |
| 456 | * minute, this is a USB driver, talking to a Unipro bridge, impedance |
| 457 | * mismatch is huge, yet the Unipro controller are even more |
| 458 | * underpowered than this little USB controller. We rely on the round |
| 459 | * trip to keep stalls in the Unipro controllers from happening so that |
| 460 | * we can keep data flowing properly, no matter how slow it might be. |
| 461 | * |
| 462 | * Once again, a wonderful bus protocol cut down in its prime by a naive |
| 463 | * controller chip. We dream of the day we have a "real" HCD for |
| 464 | * Unipro. Until then, we suck it up and make the hardware work, as |
| 465 | * that's the job of the firmware and kernel. |
| 466 | * </rant> |
| 467 | */ |
| 468 | } |
| 469 | |
| 470 | /* |
| 471 | * The ES1 USB Bridge device contains 4 endpoints |
| 472 | * 1 Control - usual USB stuff + AP -> SVC messages |
| 473 | * 1 Interrupt IN - SVC -> AP messages |
| 474 | * 1 Bulk IN - CPort data in |
| 475 | * 1 Bulk OUT - CPort data out |
| 476 | */ |
| 477 | static int ap_probe(struct usb_interface *interface, |
| 478 | const struct usb_device_id *id) |
| 479 | { |
| 480 | struct es1_ap_dev *es1; |
| 481 | struct greybus_host_device *hd; |
| 482 | struct usb_device *udev; |
| 483 | struct usb_host_interface *iface_desc; |
| 484 | struct usb_endpoint_descriptor *endpoint; |
| 485 | bool int_in_found = false; |
| 486 | bool bulk_in_found = false; |
| 487 | bool bulk_out_found = false; |
| 488 | int retval = -ENOMEM; |
| 489 | int i; |
| 490 | u8 svc_interval = 0; |
| 491 | |
| 492 | udev = usb_get_dev(interface_to_usbdev(interface)); |
| 493 | |
| 494 | hd = greybus_create_hd(&es1_driver, &udev->dev); |
| 495 | if (!hd) { |
| 496 | usb_put_dev(udev); |
| 497 | return -ENOMEM; |
| 498 | } |
| 499 | |
| 500 | /* Fill in the buffer allocation constraints */ |
| 501 | hd_buffer_constraints(hd); |
| 502 | |
| 503 | es1 = hd_to_es1(hd); |
| 504 | es1->hd = hd; |
| 505 | es1->usb_intf = interface; |
| 506 | es1->usb_dev = udev; |
| 507 | spin_lock_init(&es1->cport_out_urb_lock); |
| 508 | usb_set_intfdata(interface, es1); |
| 509 | |
| 510 | /* Control endpoint is the pipe to talk to this AP, so save it off */ |
| 511 | endpoint = &udev->ep0.desc; |
| 512 | es1->control_endpoint = endpoint->bEndpointAddress; |
| 513 | |
| 514 | /* find all 3 of our endpoints */ |
| 515 | iface_desc = interface->cur_altsetting; |
| 516 | for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { |
| 517 | endpoint = &iface_desc->endpoint[i].desc; |
| 518 | |
| 519 | if (usb_endpoint_is_int_in(endpoint)) { |
| 520 | es1->svc_endpoint = endpoint->bEndpointAddress; |
| 521 | svc_interval = endpoint->bInterval; |
| 522 | int_in_found = true; |
| 523 | } else if (usb_endpoint_is_bulk_in(endpoint)) { |
| 524 | es1->cport_in_endpoint = endpoint->bEndpointAddress; |
| 525 | bulk_in_found = true; |
| 526 | } else if (usb_endpoint_is_bulk_out(endpoint)) { |
| 527 | es1->cport_out_endpoint = endpoint->bEndpointAddress; |
| 528 | bulk_out_found = true; |
| 529 | } else { |
| 530 | dev_err(&udev->dev, |
| 531 | "Unknown endpoint type found, address %x\n", |
| 532 | endpoint->bEndpointAddress); |
| 533 | } |
| 534 | } |
| 535 | if ((int_in_found == false) || |
| 536 | (bulk_in_found == false) || |
| 537 | (bulk_out_found == false)) { |
| 538 | dev_err(&udev->dev, "Not enough endpoints found in device, aborting!\n"); |
| 539 | goto error; |
| 540 | } |
| 541 | |
| 542 | /* Create our buffer and URB to get SVC messages, and start it up */ |
| 543 | es1->svc_buffer = kmalloc(ES1_SVC_MSG_SIZE, GFP_KERNEL); |
| 544 | if (!es1->svc_buffer) |
| 545 | goto error; |
| 546 | |
| 547 | es1->svc_urb = usb_alloc_urb(0, GFP_KERNEL); |
| 548 | if (!es1->svc_urb) |
| 549 | goto error; |
| 550 | |
| 551 | usb_fill_int_urb(es1->svc_urb, udev, |
| 552 | usb_rcvintpipe(udev, es1->svc_endpoint), |
| 553 | es1->svc_buffer, ES1_SVC_MSG_SIZE, svc_in_callback, |
| 554 | hd, svc_interval); |
| 555 | retval = usb_submit_urb(es1->svc_urb, GFP_KERNEL); |
| 556 | if (retval) |
| 557 | goto error; |
| 558 | |
| 559 | /* Allocate buffers for our cport in messages and start them up */ |
| 560 | for (i = 0; i < NUM_CPORT_IN_URB; ++i) { |
| 561 | struct urb *urb; |
| 562 | u8 *buffer; |
| 563 | |
| 564 | urb = usb_alloc_urb(0, GFP_KERNEL); |
| 565 | if (!urb) |
| 566 | goto error; |
| 567 | buffer = kmalloc(ES1_GBUF_MSG_SIZE_MAX, GFP_KERNEL); |
| 568 | if (!buffer) |
| 569 | goto error; |
| 570 | |
| 571 | usb_fill_bulk_urb(urb, udev, |
| 572 | usb_rcvbulkpipe(udev, es1->cport_in_endpoint), |
| 573 | buffer, ES1_GBUF_MSG_SIZE_MAX, |
| 574 | cport_in_callback, hd); |
| 575 | es1->cport_in_urb[i] = urb; |
| 576 | es1->cport_in_buffer[i] = buffer; |
| 577 | retval = usb_submit_urb(urb, GFP_KERNEL); |
| 578 | if (retval) |
| 579 | goto error; |
| 580 | } |
| 581 | |
| 582 | /* Allocate urbs for our CPort OUT messages */ |
| 583 | for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { |
| 584 | struct urb *urb; |
| 585 | |
| 586 | urb = usb_alloc_urb(0, GFP_KERNEL); |
| 587 | if (!urb) |
| 588 | goto error; |
| 589 | |
| 590 | es1->cport_out_urb[i] = urb; |
| 591 | es1->cport_out_urb_busy[i] = false; /* just to be anal */ |
| 592 | } |
| 593 | |
| 594 | return 0; |
| 595 | error: |
| 596 | ap_disconnect(interface); |
| 597 | |
| 598 | return retval; |
| 599 | } |
| 600 | |
| 601 | static struct usb_driver es1_ap_driver = { |
| 602 | .name = "es1_ap_driver", |
| 603 | .probe = ap_probe, |
| 604 | .disconnect = ap_disconnect, |
| 605 | .id_table = id_table, |
| 606 | }; |
| 607 | |
| 608 | module_usb_driver(es1_ap_driver); |
| 609 | |
| 610 | MODULE_LICENSE("GPL"); |
| 611 | MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>"); |