Ezequiel García | 9cb2173 | 2012-08-11 14:32:57 -0300 | [diff] [blame] | 1 | /* |
| 2 | * STK1160 driver |
| 3 | * |
| 4 | * Copyright (C) 2012 Ezequiel Garcia |
| 5 | * <elezegarcia--a.t--gmail.com> |
| 6 | * |
| 7 | * Based on Easycap driver by R.M. Thomas |
| 8 | * Copyright (C) 2010 R.M. Thomas |
| 9 | * <rmthomas--a.t--sciolus.org> |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 of the License, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | */ |
| 22 | |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/usb.h> |
| 25 | #include <linux/slab.h> |
| 26 | #include <linux/ratelimit.h> |
| 27 | |
| 28 | #include "stk1160.h" |
| 29 | |
| 30 | static unsigned int debug; |
| 31 | module_param(debug, int, 0644); |
| 32 | MODULE_PARM_DESC(debug, "enable debug messages"); |
| 33 | |
| 34 | static inline void print_err_status(struct stk1160 *dev, |
| 35 | int packet, int status) |
| 36 | { |
| 37 | char *errmsg = "Unknown"; |
| 38 | |
| 39 | switch (status) { |
| 40 | case -ENOENT: |
| 41 | errmsg = "unlinked synchronuously"; |
| 42 | break; |
| 43 | case -ECONNRESET: |
| 44 | errmsg = "unlinked asynchronuously"; |
| 45 | break; |
| 46 | case -ENOSR: |
| 47 | errmsg = "Buffer error (overrun)"; |
| 48 | break; |
| 49 | case -EPIPE: |
| 50 | errmsg = "Stalled (device not responding)"; |
| 51 | break; |
| 52 | case -EOVERFLOW: |
| 53 | errmsg = "Babble (bad cable?)"; |
| 54 | break; |
| 55 | case -EPROTO: |
| 56 | errmsg = "Bit-stuff error (bad cable?)"; |
| 57 | break; |
| 58 | case -EILSEQ: |
| 59 | errmsg = "CRC/Timeout (could be anything)"; |
| 60 | break; |
| 61 | case -ETIME: |
| 62 | errmsg = "Device does not respond"; |
| 63 | break; |
| 64 | } |
| 65 | |
| 66 | if (packet < 0) |
| 67 | printk_ratelimited(KERN_WARNING "URB status %d [%s].\n", |
| 68 | status, errmsg); |
| 69 | else |
| 70 | printk_ratelimited(KERN_INFO "URB packet %d, status %d [%s].\n", |
| 71 | packet, status, errmsg); |
| 72 | } |
| 73 | |
| 74 | static inline |
| 75 | struct stk1160_buffer *stk1160_next_buffer(struct stk1160 *dev) |
| 76 | { |
| 77 | struct stk1160_buffer *buf = NULL; |
| 78 | unsigned long flags = 0; |
| 79 | |
| 80 | /* Current buffer must be NULL when this functions gets called */ |
Ezequiel Garcia | e003ae3 | 2012-11-23 08:12:35 -0300 | [diff] [blame] | 81 | WARN_ON(dev->isoc_ctl.buf); |
Ezequiel García | 9cb2173 | 2012-08-11 14:32:57 -0300 | [diff] [blame] | 82 | |
| 83 | spin_lock_irqsave(&dev->buf_lock, flags); |
| 84 | if (!list_empty(&dev->avail_bufs)) { |
| 85 | buf = list_first_entry(&dev->avail_bufs, |
| 86 | struct stk1160_buffer, list); |
| 87 | list_del(&buf->list); |
| 88 | } |
| 89 | spin_unlock_irqrestore(&dev->buf_lock, flags); |
| 90 | |
| 91 | return buf; |
| 92 | } |
| 93 | |
| 94 | static inline |
| 95 | void stk1160_buffer_done(struct stk1160 *dev) |
| 96 | { |
| 97 | struct stk1160_buffer *buf = dev->isoc_ctl.buf; |
| 98 | |
Junghak Sung | 2d70071 | 2015-09-22 10:30:30 -0300 | [diff] [blame] | 99 | buf->vb.sequence = dev->sequence++; |
| 100 | buf->vb.field = V4L2_FIELD_INTERLACED; |
Junghak Sung | d6dd645 | 2015-11-03 08:16:37 -0200 | [diff] [blame] | 101 | buf->vb.vb2_buf.timestamp = ktime_get_ns(); |
Ezequiel García | 9cb2173 | 2012-08-11 14:32:57 -0300 | [diff] [blame] | 102 | |
Junghak Sung | 2d70071 | 2015-09-22 10:30:30 -0300 | [diff] [blame] | 103 | vb2_set_plane_payload(&buf->vb.vb2_buf, 0, buf->bytesused); |
| 104 | vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE); |
Ezequiel García | 9cb2173 | 2012-08-11 14:32:57 -0300 | [diff] [blame] | 105 | |
| 106 | dev->isoc_ctl.buf = NULL; |
| 107 | } |
| 108 | |
| 109 | static inline |
| 110 | void stk1160_copy_video(struct stk1160 *dev, u8 *src, int len) |
| 111 | { |
| 112 | int linesdone, lineoff, lencopy; |
| 113 | int bytesperline = dev->width * 2; |
| 114 | struct stk1160_buffer *buf = dev->isoc_ctl.buf; |
| 115 | u8 *dst = buf->mem; |
| 116 | int remain; |
| 117 | |
| 118 | /* |
| 119 | * TODO: These stk1160_dbg are very spammy! |
| 120 | * We should 1) check why we are getting them |
| 121 | * and 2) add ratelimit. |
| 122 | * |
| 123 | * UPDATE: One of the reasons (the only one?) for getting these |
| 124 | * is incorrect standard (mismatch between expected and configured). |
| 125 | * So perhaps, we could add a counter for errors. When the counter |
| 126 | * reaches some value, we simply stop streaming. |
| 127 | */ |
| 128 | |
| 129 | len -= 4; |
| 130 | src += 4; |
| 131 | |
| 132 | remain = len; |
| 133 | |
| 134 | linesdone = buf->pos / bytesperline; |
| 135 | lineoff = buf->pos % bytesperline; /* offset in current line */ |
| 136 | |
| 137 | if (!buf->odd) |
| 138 | dst += bytesperline; |
| 139 | |
| 140 | /* Multiply linesdone by two, to take account of the other field */ |
| 141 | dst += linesdone * bytesperline * 2 + lineoff; |
| 142 | |
| 143 | /* Copy the remaining of current line */ |
| 144 | if (remain < (bytesperline - lineoff)) |
| 145 | lencopy = remain; |
| 146 | else |
| 147 | lencopy = bytesperline - lineoff; |
| 148 | |
| 149 | /* |
| 150 | * Check if we have enough space left in the buffer. |
| 151 | * In that case, we force loop exit after copy. |
| 152 | */ |
| 153 | if (lencopy > buf->bytesused - buf->length) { |
| 154 | lencopy = buf->bytesused - buf->length; |
| 155 | remain = lencopy; |
| 156 | } |
| 157 | |
| 158 | /* Check if the copy is done */ |
| 159 | if (lencopy == 0 || remain == 0) |
| 160 | return; |
| 161 | |
| 162 | /* Let the bug hunt begin! sanity checks! */ |
| 163 | if (lencopy < 0) { |
| 164 | stk1160_dbg("copy skipped: negative lencopy\n"); |
| 165 | return; |
| 166 | } |
| 167 | |
| 168 | if ((unsigned long)dst + lencopy > |
| 169 | (unsigned long)buf->mem + buf->length) { |
| 170 | printk_ratelimited(KERN_WARNING "stk1160: buffer overflow detected\n"); |
| 171 | return; |
| 172 | } |
| 173 | |
| 174 | memcpy(dst, src, lencopy); |
| 175 | |
| 176 | buf->bytesused += lencopy; |
| 177 | buf->pos += lencopy; |
| 178 | remain -= lencopy; |
| 179 | |
| 180 | /* Copy current field line by line, interlacing with the other field */ |
| 181 | while (remain > 0) { |
| 182 | |
| 183 | dst += lencopy + bytesperline; |
| 184 | src += lencopy; |
| 185 | |
| 186 | /* Copy one line at a time */ |
| 187 | if (remain < bytesperline) |
| 188 | lencopy = remain; |
| 189 | else |
| 190 | lencopy = bytesperline; |
| 191 | |
| 192 | /* |
| 193 | * Check if we have enough space left in the buffer. |
| 194 | * In that case, we force loop exit after copy. |
| 195 | */ |
| 196 | if (lencopy > buf->bytesused - buf->length) { |
| 197 | lencopy = buf->bytesused - buf->length; |
| 198 | remain = lencopy; |
| 199 | } |
| 200 | |
| 201 | /* Check if the copy is done */ |
| 202 | if (lencopy == 0 || remain == 0) |
| 203 | return; |
| 204 | |
| 205 | if (lencopy < 0) { |
| 206 | printk_ratelimited(KERN_WARNING "stk1160: negative lencopy detected\n"); |
| 207 | return; |
| 208 | } |
| 209 | |
| 210 | if ((unsigned long)dst + lencopy > |
| 211 | (unsigned long)buf->mem + buf->length) { |
| 212 | printk_ratelimited(KERN_WARNING "stk1160: buffer overflow detected\n"); |
| 213 | return; |
| 214 | } |
| 215 | |
| 216 | memcpy(dst, src, lencopy); |
| 217 | remain -= lencopy; |
| 218 | |
| 219 | buf->bytesused += lencopy; |
| 220 | buf->pos += lencopy; |
| 221 | } |
| 222 | } |
| 223 | |
| 224 | /* |
| 225 | * Controls the isoc copy of each urb packet |
| 226 | */ |
| 227 | static void stk1160_process_isoc(struct stk1160 *dev, struct urb *urb) |
| 228 | { |
| 229 | int i, len, status; |
| 230 | u8 *p; |
| 231 | |
| 232 | if (!dev) { |
| 233 | stk1160_warn("%s called with null device\n", __func__); |
| 234 | return; |
| 235 | } |
| 236 | |
| 237 | if (urb->status < 0) { |
| 238 | /* Print status and drop current packet (or field?) */ |
| 239 | print_err_status(dev, -1, urb->status); |
| 240 | return; |
| 241 | } |
| 242 | |
| 243 | for (i = 0; i < urb->number_of_packets; i++) { |
| 244 | status = urb->iso_frame_desc[i].status; |
| 245 | if (status < 0) { |
| 246 | print_err_status(dev, i, status); |
| 247 | continue; |
| 248 | } |
| 249 | |
| 250 | /* Get packet actual length and pointer to data */ |
| 251 | p = urb->transfer_buffer + urb->iso_frame_desc[i].offset; |
| 252 | len = urb->iso_frame_desc[i].actual_length; |
| 253 | |
| 254 | /* Empty packet */ |
| 255 | if (len <= 4) |
| 256 | continue; |
| 257 | |
| 258 | /* |
| 259 | * An 8-byte packet sequence means end of field. |
| 260 | * So if we don't have any packet, we start receiving one now |
| 261 | * and if we do have a packet, then we are done with it. |
| 262 | * |
| 263 | * These end of field packets are always 0xc0 or 0x80, |
| 264 | * but not always 8-byte long so we don't check packet length. |
| 265 | */ |
| 266 | if (p[0] == 0xc0) { |
| 267 | |
| 268 | /* |
| 269 | * If first byte is 0xc0 then we received |
| 270 | * second field, and frame has ended. |
| 271 | */ |
| 272 | if (dev->isoc_ctl.buf != NULL) |
| 273 | stk1160_buffer_done(dev); |
| 274 | |
| 275 | dev->isoc_ctl.buf = stk1160_next_buffer(dev); |
| 276 | if (dev->isoc_ctl.buf == NULL) |
| 277 | return; |
| 278 | } |
| 279 | |
| 280 | /* |
| 281 | * If we don't have a buffer here, then it means we |
| 282 | * haven't found the start mark sequence. |
| 283 | */ |
| 284 | if (dev->isoc_ctl.buf == NULL) |
| 285 | continue; |
| 286 | |
| 287 | if (p[0] == 0xc0 || p[0] == 0x80) { |
| 288 | |
| 289 | /* We set next packet parity and |
| 290 | * continue to get next one |
| 291 | */ |
| 292 | dev->isoc_ctl.buf->odd = *p & 0x40; |
| 293 | dev->isoc_ctl.buf->pos = 0; |
| 294 | continue; |
| 295 | } |
| 296 | |
| 297 | stk1160_copy_video(dev, p, len); |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | |
| 302 | /* |
| 303 | * IRQ callback, called by URB callback |
| 304 | */ |
| 305 | static void stk1160_isoc_irq(struct urb *urb) |
| 306 | { |
| 307 | int i, rc; |
| 308 | struct stk1160 *dev = urb->context; |
| 309 | |
| 310 | switch (urb->status) { |
| 311 | case 0: |
| 312 | break; |
| 313 | case -ECONNRESET: /* kill */ |
| 314 | case -ENOENT: |
| 315 | case -ESHUTDOWN: |
| 316 | /* TODO: check uvc driver: he frees the queue here */ |
| 317 | return; |
| 318 | default: |
| 319 | stk1160_err("urb error! status %d\n", urb->status); |
| 320 | return; |
| 321 | } |
| 322 | |
| 323 | stk1160_process_isoc(dev, urb); |
| 324 | |
| 325 | /* Reset urb buffers */ |
| 326 | for (i = 0; i < urb->number_of_packets; i++) { |
| 327 | urb->iso_frame_desc[i].status = 0; |
| 328 | urb->iso_frame_desc[i].actual_length = 0; |
| 329 | } |
| 330 | |
| 331 | rc = usb_submit_urb(urb, GFP_ATOMIC); |
| 332 | if (rc) |
| 333 | stk1160_err("urb re-submit failed (%d)\n", rc); |
| 334 | } |
| 335 | |
| 336 | /* |
| 337 | * Cancel urbs |
| 338 | * This function can't be called in atomic context |
| 339 | */ |
| 340 | void stk1160_cancel_isoc(struct stk1160 *dev) |
| 341 | { |
Ezequiel Garcia | 18ad896 | 2012-08-19 21:23:43 -0300 | [diff] [blame] | 342 | int i, num_bufs = dev->isoc_ctl.num_bufs; |
Ezequiel García | 9cb2173 | 2012-08-11 14:32:57 -0300 | [diff] [blame] | 343 | |
| 344 | /* |
| 345 | * This check is not necessary, but we add it |
| 346 | * to avoid a spurious debug message |
| 347 | */ |
Ezequiel Garcia | 18ad896 | 2012-08-19 21:23:43 -0300 | [diff] [blame] | 348 | if (!num_bufs) |
Ezequiel García | 9cb2173 | 2012-08-11 14:32:57 -0300 | [diff] [blame] | 349 | return; |
| 350 | |
Ezequiel Garcia | 18ad896 | 2012-08-19 21:23:43 -0300 | [diff] [blame] | 351 | stk1160_dbg("killing %d urbs...\n", num_bufs); |
Ezequiel García | 9cb2173 | 2012-08-11 14:32:57 -0300 | [diff] [blame] | 352 | |
Ezequiel Garcia | 18ad896 | 2012-08-19 21:23:43 -0300 | [diff] [blame] | 353 | for (i = 0; i < num_bufs; i++) { |
Ezequiel García | 9cb2173 | 2012-08-11 14:32:57 -0300 | [diff] [blame] | 354 | |
| 355 | /* |
| 356 | * To kill urbs we can't be in atomic context. |
| 357 | * We don't care for NULL pointer since |
| 358 | * usb_kill_urb allows it. |
| 359 | */ |
| 360 | usb_kill_urb(dev->isoc_ctl.urb[i]); |
| 361 | } |
| 362 | |
| 363 | stk1160_dbg("all urbs killed\n"); |
| 364 | } |
| 365 | |
| 366 | /* |
| 367 | * Releases urb and transfer buffers |
| 368 | * Obviusly, associated urb must be killed before releasing it. |
| 369 | */ |
| 370 | void stk1160_free_isoc(struct stk1160 *dev) |
| 371 | { |
| 372 | struct urb *urb; |
Ezequiel Garcia | 18ad896 | 2012-08-19 21:23:43 -0300 | [diff] [blame] | 373 | int i, num_bufs = dev->isoc_ctl.num_bufs; |
Ezequiel García | 9cb2173 | 2012-08-11 14:32:57 -0300 | [diff] [blame] | 374 | |
Ezequiel Garcia | 18ad896 | 2012-08-19 21:23:43 -0300 | [diff] [blame] | 375 | stk1160_dbg("freeing %d urb buffers...\n", num_bufs); |
Ezequiel García | 9cb2173 | 2012-08-11 14:32:57 -0300 | [diff] [blame] | 376 | |
Ezequiel Garcia | 18ad896 | 2012-08-19 21:23:43 -0300 | [diff] [blame] | 377 | for (i = 0; i < num_bufs; i++) { |
Ezequiel García | 9cb2173 | 2012-08-11 14:32:57 -0300 | [diff] [blame] | 378 | |
| 379 | urb = dev->isoc_ctl.urb[i]; |
| 380 | if (urb) { |
| 381 | |
| 382 | if (dev->isoc_ctl.transfer_buffer[i]) { |
| 383 | #ifndef CONFIG_DMA_NONCOHERENT |
| 384 | usb_free_coherent(dev->udev, |
| 385 | urb->transfer_buffer_length, |
| 386 | dev->isoc_ctl.transfer_buffer[i], |
| 387 | urb->transfer_dma); |
| 388 | #else |
| 389 | kfree(dev->isoc_ctl.transfer_buffer[i]); |
| 390 | #endif |
| 391 | } |
| 392 | usb_free_urb(urb); |
| 393 | dev->isoc_ctl.urb[i] = NULL; |
| 394 | } |
| 395 | dev->isoc_ctl.transfer_buffer[i] = NULL; |
| 396 | } |
| 397 | |
| 398 | kfree(dev->isoc_ctl.urb); |
| 399 | kfree(dev->isoc_ctl.transfer_buffer); |
| 400 | |
| 401 | dev->isoc_ctl.urb = NULL; |
| 402 | dev->isoc_ctl.transfer_buffer = NULL; |
| 403 | dev->isoc_ctl.num_bufs = 0; |
| 404 | |
| 405 | stk1160_dbg("all urb buffers freed\n"); |
| 406 | } |
| 407 | |
| 408 | /* |
| 409 | * Helper for cancelling and freeing urbs |
| 410 | * This function can't be called in atomic context |
| 411 | */ |
| 412 | void stk1160_uninit_isoc(struct stk1160 *dev) |
| 413 | { |
| 414 | stk1160_cancel_isoc(dev); |
| 415 | stk1160_free_isoc(dev); |
| 416 | } |
| 417 | |
| 418 | /* |
| 419 | * Allocate URBs |
| 420 | */ |
| 421 | int stk1160_alloc_isoc(struct stk1160 *dev) |
| 422 | { |
| 423 | struct urb *urb; |
| 424 | int i, j, k, sb_size, max_packets, num_bufs; |
| 425 | |
| 426 | /* |
| 427 | * It may be necessary to release isoc here, |
| 428 | * since isoc are only released on disconnection. |
| 429 | * (see new_pkt_size flag) |
| 430 | */ |
| 431 | if (dev->isoc_ctl.num_bufs) |
| 432 | stk1160_uninit_isoc(dev); |
| 433 | |
| 434 | stk1160_dbg("allocating urbs...\n"); |
| 435 | |
| 436 | num_bufs = STK1160_NUM_BUFS; |
| 437 | max_packets = STK1160_NUM_PACKETS; |
| 438 | sb_size = max_packets * dev->max_pkt_size; |
| 439 | |
| 440 | dev->isoc_ctl.buf = NULL; |
| 441 | dev->isoc_ctl.max_pkt_size = dev->max_pkt_size; |
| 442 | dev->isoc_ctl.urb = kzalloc(sizeof(void *)*num_bufs, GFP_KERNEL); |
| 443 | if (!dev->isoc_ctl.urb) { |
| 444 | stk1160_err("out of memory for urb array\n"); |
| 445 | return -ENOMEM; |
| 446 | } |
| 447 | |
| 448 | dev->isoc_ctl.transfer_buffer = kzalloc(sizeof(void *)*num_bufs, |
| 449 | GFP_KERNEL); |
| 450 | if (!dev->isoc_ctl.transfer_buffer) { |
| 451 | stk1160_err("out of memory for usb transfers\n"); |
| 452 | kfree(dev->isoc_ctl.urb); |
| 453 | return -ENOMEM; |
| 454 | } |
| 455 | |
| 456 | /* allocate urbs and transfer buffers */ |
| 457 | for (i = 0; i < num_bufs; i++) { |
| 458 | |
| 459 | urb = usb_alloc_urb(max_packets, GFP_KERNEL); |
| 460 | if (!urb) { |
| 461 | stk1160_err("cannot alloc urb[%d]\n", i); |
Ezequiel Garcia | 0657418 | 2012-08-19 21:23:44 -0300 | [diff] [blame] | 462 | goto free_i_bufs; |
Ezequiel García | 9cb2173 | 2012-08-11 14:32:57 -0300 | [diff] [blame] | 463 | } |
| 464 | dev->isoc_ctl.urb[i] = urb; |
| 465 | |
| 466 | #ifndef CONFIG_DMA_NONCOHERENT |
| 467 | dev->isoc_ctl.transfer_buffer[i] = usb_alloc_coherent(dev->udev, |
| 468 | sb_size, GFP_KERNEL, &urb->transfer_dma); |
| 469 | #else |
| 470 | dev->isoc_ctl.transfer_buffer[i] = kmalloc(sb_size, GFP_KERNEL); |
| 471 | #endif |
| 472 | if (!dev->isoc_ctl.transfer_buffer[i]) { |
Ezequiel Garcia | 0657418 | 2012-08-19 21:23:44 -0300 | [diff] [blame] | 473 | stk1160_err("cannot alloc %d bytes for tx[%d] buffer\n", |
| 474 | sb_size, i); |
Ezequiel Garcia | 2902fb7 | 2012-10-23 21:20:30 -0300 | [diff] [blame] | 475 | |
| 476 | /* Not enough transfer buffers, so just give up */ |
| 477 | if (i < STK1160_MIN_BUFS) |
| 478 | goto free_i_bufs; |
| 479 | goto nomore_tx_bufs; |
Ezequiel García | 9cb2173 | 2012-08-11 14:32:57 -0300 | [diff] [blame] | 480 | } |
| 481 | memset(dev->isoc_ctl.transfer_buffer[i], 0, sb_size); |
| 482 | |
| 483 | /* |
| 484 | * FIXME: Where can I get the endpoint? |
| 485 | */ |
| 486 | urb->dev = dev->udev; |
| 487 | urb->pipe = usb_rcvisocpipe(dev->udev, STK1160_EP_VIDEO); |
| 488 | urb->transfer_buffer = dev->isoc_ctl.transfer_buffer[i]; |
| 489 | urb->transfer_buffer_length = sb_size; |
| 490 | urb->complete = stk1160_isoc_irq; |
| 491 | urb->context = dev; |
| 492 | urb->interval = 1; |
| 493 | urb->start_frame = 0; |
| 494 | urb->number_of_packets = max_packets; |
| 495 | #ifndef CONFIG_DMA_NONCOHERENT |
| 496 | urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; |
| 497 | #else |
| 498 | urb->transfer_flags = URB_ISO_ASAP; |
| 499 | #endif |
| 500 | |
| 501 | k = 0; |
| 502 | for (j = 0; j < max_packets; j++) { |
| 503 | urb->iso_frame_desc[j].offset = k; |
| 504 | urb->iso_frame_desc[j].length = |
| 505 | dev->isoc_ctl.max_pkt_size; |
| 506 | k += dev->isoc_ctl.max_pkt_size; |
| 507 | } |
| 508 | } |
| 509 | |
Ezequiel Garcia | 2902fb7 | 2012-10-23 21:20:30 -0300 | [diff] [blame] | 510 | stk1160_dbg("%d urbs allocated\n", num_bufs); |
Ezequiel García | 9cb2173 | 2012-08-11 14:32:57 -0300 | [diff] [blame] | 511 | |
| 512 | /* At last we can say we have some buffers */ |
| 513 | dev->isoc_ctl.num_bufs = num_bufs; |
| 514 | |
| 515 | return 0; |
Ezequiel Garcia | 0657418 | 2012-08-19 21:23:44 -0300 | [diff] [blame] | 516 | |
Ezequiel Garcia | 2902fb7 | 2012-10-23 21:20:30 -0300 | [diff] [blame] | 517 | nomore_tx_bufs: |
| 518 | /* |
| 519 | * Failed to allocate desired buffer count. However, we may have |
| 520 | * enough to work fine, so we just free the extra urb, |
| 521 | * store the allocated count and keep going, fingers crossed! |
| 522 | */ |
| 523 | usb_free_urb(dev->isoc_ctl.urb[i]); |
| 524 | dev->isoc_ctl.urb[i] = NULL; |
| 525 | |
| 526 | stk1160_warn("%d urbs allocated. Trying to continue...\n", i - 1); |
| 527 | |
| 528 | dev->isoc_ctl.num_bufs = i - 1; |
| 529 | |
| 530 | return 0; |
| 531 | |
Ezequiel Garcia | 0657418 | 2012-08-19 21:23:44 -0300 | [diff] [blame] | 532 | free_i_bufs: |
| 533 | /* Save the allocated buffers so far, so we can properly free them */ |
| 534 | dev->isoc_ctl.num_bufs = i+1; |
| 535 | stk1160_free_isoc(dev); |
| 536 | return -ENOMEM; |
Ezequiel García | 9cb2173 | 2012-08-11 14:32:57 -0300 | [diff] [blame] | 537 | } |
| 538 | |