Daniel Mack | e577999 | 2010-03-04 19:46:13 +0100 | [diff] [blame] | 1 | /* |
| 2 | * This program is free software; you can redistribute it and/or modify |
| 3 | * it under the terms of the GNU General Public License as published by |
| 4 | * the Free Software Foundation; either version 2 of the License, or |
| 5 | * (at your option) any later version. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | * |
| 12 | * You should have received a copy of the GNU General Public License |
| 13 | * along with this program; if not, write to the Free Software |
| 14 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 15 | * |
| 16 | */ |
| 17 | |
Daniel Mack | c731bc9 | 2011-09-14 12:46:57 +0200 | [diff] [blame] | 18 | #include <linux/gfp.h> |
| 19 | #include <linux/init.h> |
Takashi Iwai | 80c8a2a | 2012-01-09 11:37:20 +0100 | [diff] [blame] | 20 | #include <linux/ratelimit.h> |
Daniel Mack | c731bc9 | 2011-09-14 12:46:57 +0200 | [diff] [blame] | 21 | #include <linux/usb.h> |
| 22 | #include <linux/usb/audio.h> |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 23 | #include <linux/slab.h> |
Daniel Mack | c731bc9 | 2011-09-14 12:46:57 +0200 | [diff] [blame] | 24 | |
| 25 | #include <sound/core.h> |
| 26 | #include <sound/pcm.h> |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 27 | #include <sound/pcm_params.h> |
Daniel Mack | c731bc9 | 2011-09-14 12:46:57 +0200 | [diff] [blame] | 28 | |
| 29 | #include "usbaudio.h" |
| 30 | #include "helper.h" |
| 31 | #include "card.h" |
| 32 | #include "endpoint.h" |
| 33 | #include "pcm.h" |
Daniel Mack | 2b58fd5 | 2012-09-04 10:23:07 +0200 | [diff] [blame] | 34 | #include "quirks.h" |
Daniel Mack | c731bc9 | 2011-09-14 12:46:57 +0200 | [diff] [blame] | 35 | |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 36 | #define EP_FLAG_RUNNING 1 |
Takashi Iwai | f58161b | 2012-11-08 08:52:45 +0100 | [diff] [blame] | 37 | #define EP_FLAG_STOPPING 2 |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 38 | |
Daniel Mack | c731bc9 | 2011-09-14 12:46:57 +0200 | [diff] [blame] | 39 | /* |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 40 | * snd_usb_endpoint is a model that abstracts everything related to an |
| 41 | * USB endpoint and its streaming. |
| 42 | * |
| 43 | * There are functions to activate and deactivate the streaming URBs and |
Daniel Mack | 07a5e9d | 2012-04-24 19:31:24 +0200 | [diff] [blame] | 44 | * optional callbacks to let the pcm logic handle the actual content of the |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 45 | * packets for playback and record. Thus, the bus streaming and the audio |
| 46 | * handlers are fully decoupled. |
| 47 | * |
Daniel Mack | 07a5e9d | 2012-04-24 19:31:24 +0200 | [diff] [blame] | 48 | * There are two different types of endpoints in audio applications. |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 49 | * |
| 50 | * SND_USB_ENDPOINT_TYPE_DATA handles full audio data payload for both |
| 51 | * inbound and outbound traffic. |
| 52 | * |
Daniel Mack | 07a5e9d | 2012-04-24 19:31:24 +0200 | [diff] [blame] | 53 | * SND_USB_ENDPOINT_TYPE_SYNC endpoints are for inbound traffic only and |
| 54 | * expect the payload to carry Q10.14 / Q16.16 formatted sync information |
| 55 | * (3 or 4 bytes). |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 56 | * |
Daniel Mack | 07a5e9d | 2012-04-24 19:31:24 +0200 | [diff] [blame] | 57 | * Each endpoint has to be configured prior to being used by calling |
| 58 | * snd_usb_endpoint_set_params(). |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 59 | * |
| 60 | * The model incorporates a reference counting, so that multiple users |
| 61 | * can call snd_usb_endpoint_start() and snd_usb_endpoint_stop(), and |
| 62 | * only the first user will effectively start the URBs, and only the last |
Daniel Mack | 07a5e9d | 2012-04-24 19:31:24 +0200 | [diff] [blame] | 63 | * one to stop it will tear the URBs down again. |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 64 | */ |
| 65 | |
| 66 | /* |
Daniel Mack | c731bc9 | 2011-09-14 12:46:57 +0200 | [diff] [blame] | 67 | * convert a sampling rate into our full speed format (fs/1000 in Q16.16) |
| 68 | * this will overflow at approx 524 kHz |
| 69 | */ |
| 70 | static inline unsigned get_usb_full_speed_rate(unsigned int rate) |
| 71 | { |
| 72 | return ((rate << 13) + 62) / 125; |
| 73 | } |
| 74 | |
| 75 | /* |
| 76 | * convert a sampling rate into USB high speed format (fs/8000 in Q16.16) |
| 77 | * this will overflow at approx 4 MHz |
| 78 | */ |
| 79 | static inline unsigned get_usb_high_speed_rate(unsigned int rate) |
| 80 | { |
| 81 | return ((rate << 10) + 62) / 125; |
| 82 | } |
| 83 | |
| 84 | /* |
Daniel Mack | c731bc9 | 2011-09-14 12:46:57 +0200 | [diff] [blame] | 85 | * release a urb data |
| 86 | */ |
| 87 | static void release_urb_ctx(struct snd_urb_ctx *u) |
| 88 | { |
Daniel Mack | d399ff9 | 2012-04-12 13:51:13 +0200 | [diff] [blame] | 89 | if (u->buffer_size) |
| 90 | usb_free_coherent(u->ep->chip->dev, u->buffer_size, |
| 91 | u->urb->transfer_buffer, |
| 92 | u->urb->transfer_dma); |
| 93 | usb_free_urb(u->urb); |
| 94 | u->urb = NULL; |
Daniel Mack | c731bc9 | 2011-09-14 12:46:57 +0200 | [diff] [blame] | 95 | } |
| 96 | |
| 97 | static const char *usb_error_string(int err) |
| 98 | { |
| 99 | switch (err) { |
| 100 | case -ENODEV: |
| 101 | return "no device"; |
| 102 | case -ENOENT: |
| 103 | return "endpoint not enabled"; |
| 104 | case -EPIPE: |
| 105 | return "endpoint stalled"; |
| 106 | case -ENOSPC: |
| 107 | return "not enough bandwidth"; |
| 108 | case -ESHUTDOWN: |
| 109 | return "device disabled"; |
| 110 | case -EHOSTUNREACH: |
| 111 | return "device suspended"; |
| 112 | case -EINVAL: |
| 113 | case -EAGAIN: |
| 114 | case -EFBIG: |
| 115 | case -EMSGSIZE: |
| 116 | return "internal error"; |
| 117 | default: |
| 118 | return "unknown error"; |
| 119 | } |
| 120 | } |
| 121 | |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 122 | /** |
| 123 | * snd_usb_endpoint_implicit_feedback_sink: Report endpoint usage type |
| 124 | * |
Daniel Mack | 07a5e9d | 2012-04-24 19:31:24 +0200 | [diff] [blame] | 125 | * @ep: The snd_usb_endpoint |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 126 | * |
| 127 | * Determine whether an endpoint is driven by an implicit feedback |
| 128 | * data endpoint source. |
| 129 | */ |
Eldad Zack | 98ae472 | 2013-04-03 23:18:52 +0200 | [diff] [blame] | 130 | int snd_usb_endpoint_implicit_feedback_sink(struct snd_usb_endpoint *ep) |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 131 | { |
| 132 | return ep->sync_master && |
| 133 | ep->sync_master->type == SND_USB_ENDPOINT_TYPE_DATA && |
| 134 | ep->type == SND_USB_ENDPOINT_TYPE_DATA && |
| 135 | usb_pipeout(ep->pipe); |
| 136 | } |
| 137 | |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 138 | /* |
| 139 | * For streaming based on information derived from sync endpoints, |
| 140 | * prepare_outbound_urb_sizes() will call next_packet_size() to |
| 141 | * determine the number of samples to be sent in the next packet. |
| 142 | * |
| 143 | * For implicit feedback, next_packet_size() is unused. |
| 144 | */ |
Daniel Mack | 245baf9 | 2012-08-30 18:52:30 +0200 | [diff] [blame] | 145 | int snd_usb_endpoint_next_packet_size(struct snd_usb_endpoint *ep) |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 146 | { |
| 147 | unsigned long flags; |
| 148 | int ret; |
| 149 | |
| 150 | if (ep->fill_max) |
| 151 | return ep->maxframesize; |
| 152 | |
| 153 | spin_lock_irqsave(&ep->lock, flags); |
| 154 | ep->phase = (ep->phase & 0xffff) |
| 155 | + (ep->freqm << ep->datainterval); |
| 156 | ret = min(ep->phase >> 16, ep->maxframesize); |
| 157 | spin_unlock_irqrestore(&ep->lock, flags); |
| 158 | |
| 159 | return ret; |
| 160 | } |
| 161 | |
| 162 | static void retire_outbound_urb(struct snd_usb_endpoint *ep, |
| 163 | struct snd_urb_ctx *urb_ctx) |
| 164 | { |
| 165 | if (ep->retire_data_urb) |
| 166 | ep->retire_data_urb(ep->data_subs, urb_ctx->urb); |
| 167 | } |
| 168 | |
| 169 | static void retire_inbound_urb(struct snd_usb_endpoint *ep, |
| 170 | struct snd_urb_ctx *urb_ctx) |
| 171 | { |
| 172 | struct urb *urb = urb_ctx->urb; |
| 173 | |
Daniel Mack | 2b58fd5 | 2012-09-04 10:23:07 +0200 | [diff] [blame] | 174 | if (unlikely(ep->skip_packets > 0)) { |
| 175 | ep->skip_packets--; |
| 176 | return; |
| 177 | } |
| 178 | |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 179 | if (ep->sync_slave) |
| 180 | snd_usb_handle_sync_urb(ep->sync_slave, ep, urb); |
| 181 | |
| 182 | if (ep->retire_data_urb) |
| 183 | ep->retire_data_urb(ep->data_subs, urb); |
| 184 | } |
| 185 | |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 186 | /* |
| 187 | * Prepare a PLAYBACK urb for submission to the bus. |
| 188 | */ |
| 189 | static void prepare_outbound_urb(struct snd_usb_endpoint *ep, |
| 190 | struct snd_urb_ctx *ctx) |
| 191 | { |
| 192 | int i; |
| 193 | struct urb *urb = ctx->urb; |
| 194 | unsigned char *cp = urb->transfer_buffer; |
| 195 | |
| 196 | urb->dev = ep->chip->dev; /* we need to set this at each time */ |
| 197 | |
| 198 | switch (ep->type) { |
| 199 | case SND_USB_ENDPOINT_TYPE_DATA: |
| 200 | if (ep->prepare_data_urb) { |
| 201 | ep->prepare_data_urb(ep->data_subs, urb); |
| 202 | } else { |
| 203 | /* no data provider, so send silence */ |
| 204 | unsigned int offs = 0; |
| 205 | for (i = 0; i < ctx->packets; ++i) { |
Daniel Mack | 8dce30c | 2012-09-27 10:26:01 +0200 | [diff] [blame] | 206 | int counts; |
| 207 | |
| 208 | if (ctx->packet_size[i]) |
| 209 | counts = ctx->packet_size[i]; |
| 210 | else |
| 211 | counts = snd_usb_endpoint_next_packet_size(ep); |
| 212 | |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 213 | urb->iso_frame_desc[i].offset = offs * ep->stride; |
| 214 | urb->iso_frame_desc[i].length = counts * ep->stride; |
| 215 | offs += counts; |
| 216 | } |
| 217 | |
| 218 | urb->number_of_packets = ctx->packets; |
| 219 | urb->transfer_buffer_length = offs * ep->stride; |
| 220 | memset(urb->transfer_buffer, ep->silence_value, |
| 221 | offs * ep->stride); |
| 222 | } |
| 223 | break; |
| 224 | |
| 225 | case SND_USB_ENDPOINT_TYPE_SYNC: |
| 226 | if (snd_usb_get_speed(ep->chip->dev) >= USB_SPEED_HIGH) { |
| 227 | /* |
| 228 | * fill the length and offset of each urb descriptor. |
| 229 | * the fixed 12.13 frequency is passed as 16.16 through the pipe. |
| 230 | */ |
| 231 | urb->iso_frame_desc[0].length = 4; |
| 232 | urb->iso_frame_desc[0].offset = 0; |
| 233 | cp[0] = ep->freqn; |
| 234 | cp[1] = ep->freqn >> 8; |
| 235 | cp[2] = ep->freqn >> 16; |
| 236 | cp[3] = ep->freqn >> 24; |
| 237 | } else { |
| 238 | /* |
| 239 | * fill the length and offset of each urb descriptor. |
| 240 | * the fixed 10.14 frequency is passed through the pipe. |
| 241 | */ |
| 242 | urb->iso_frame_desc[0].length = 3; |
| 243 | urb->iso_frame_desc[0].offset = 0; |
| 244 | cp[0] = ep->freqn >> 2; |
| 245 | cp[1] = ep->freqn >> 10; |
| 246 | cp[2] = ep->freqn >> 18; |
| 247 | } |
| 248 | |
| 249 | break; |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | /* |
| 254 | * Prepare a CAPTURE or SYNC urb for submission to the bus. |
| 255 | */ |
| 256 | static inline void prepare_inbound_urb(struct snd_usb_endpoint *ep, |
| 257 | struct snd_urb_ctx *urb_ctx) |
| 258 | { |
| 259 | int i, offs; |
| 260 | struct urb *urb = urb_ctx->urb; |
| 261 | |
| 262 | urb->dev = ep->chip->dev; /* we need to set this at each time */ |
| 263 | |
| 264 | switch (ep->type) { |
| 265 | case SND_USB_ENDPOINT_TYPE_DATA: |
| 266 | offs = 0; |
| 267 | for (i = 0; i < urb_ctx->packets; i++) { |
| 268 | urb->iso_frame_desc[i].offset = offs; |
| 269 | urb->iso_frame_desc[i].length = ep->curpacksize; |
| 270 | offs += ep->curpacksize; |
| 271 | } |
| 272 | |
| 273 | urb->transfer_buffer_length = offs; |
| 274 | urb->number_of_packets = urb_ctx->packets; |
| 275 | break; |
| 276 | |
| 277 | case SND_USB_ENDPOINT_TYPE_SYNC: |
| 278 | urb->iso_frame_desc[0].length = min(4u, ep->syncmaxsize); |
| 279 | urb->iso_frame_desc[0].offset = 0; |
| 280 | break; |
| 281 | } |
| 282 | } |
| 283 | |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 284 | /* |
Daniel Mack | 07a5e9d | 2012-04-24 19:31:24 +0200 | [diff] [blame] | 285 | * Send output urbs that have been prepared previously. URBs are dequeued |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 286 | * from ep->ready_playback_urbs and in case there there aren't any available |
| 287 | * or there are no packets that have been prepared, this function does |
| 288 | * nothing. |
| 289 | * |
Daniel Mack | 07a5e9d | 2012-04-24 19:31:24 +0200 | [diff] [blame] | 290 | * The reason why the functionality of sending and preparing URBs is separated |
| 291 | * is that host controllers don't guarantee the order in which they return |
| 292 | * inbound and outbound packets to their submitters. |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 293 | * |
| 294 | * This function is only used for implicit feedback endpoints. For endpoints |
Daniel Mack | 07a5e9d | 2012-04-24 19:31:24 +0200 | [diff] [blame] | 295 | * driven by dedicated sync endpoints, URBs are immediately re-submitted |
| 296 | * from their completion handler. |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 297 | */ |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 298 | static void queue_pending_output_urbs(struct snd_usb_endpoint *ep) |
| 299 | { |
| 300 | while (test_bit(EP_FLAG_RUNNING, &ep->flags)) { |
| 301 | |
| 302 | unsigned long flags; |
Andrew Morton | 68853fa | 2012-04-24 08:10:10 +0200 | [diff] [blame] | 303 | struct snd_usb_packet_info *uninitialized_var(packet); |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 304 | struct snd_urb_ctx *ctx = NULL; |
| 305 | struct urb *urb; |
| 306 | int err, i; |
| 307 | |
| 308 | spin_lock_irqsave(&ep->lock, flags); |
| 309 | if (ep->next_packet_read_pos != ep->next_packet_write_pos) { |
| 310 | packet = ep->next_packet + ep->next_packet_read_pos; |
| 311 | ep->next_packet_read_pos++; |
| 312 | ep->next_packet_read_pos %= MAX_URBS; |
| 313 | |
| 314 | /* take URB out of FIFO */ |
| 315 | if (!list_empty(&ep->ready_playback_urbs)) |
| 316 | ctx = list_first_entry(&ep->ready_playback_urbs, |
| 317 | struct snd_urb_ctx, ready_list); |
| 318 | } |
| 319 | spin_unlock_irqrestore(&ep->lock, flags); |
| 320 | |
| 321 | if (ctx == NULL) |
| 322 | return; |
| 323 | |
| 324 | list_del_init(&ctx->ready_list); |
| 325 | urb = ctx->urb; |
| 326 | |
| 327 | /* copy over the length information */ |
| 328 | for (i = 0; i < packet->packets; i++) |
| 329 | ctx->packet_size[i] = packet->packet_size[i]; |
| 330 | |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 331 | /* call the data handler to fill in playback data */ |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 332 | prepare_outbound_urb(ep, ctx); |
| 333 | |
| 334 | err = usb_submit_urb(ctx->urb, GFP_ATOMIC); |
| 335 | if (err < 0) |
| 336 | snd_printk(KERN_ERR "Unable to submit urb #%d: %d (urb %p)\n", |
| 337 | ctx->index, err, ctx->urb); |
| 338 | else |
| 339 | set_bit(ctx->index, &ep->active_mask); |
| 340 | } |
| 341 | } |
| 342 | |
| 343 | /* |
| 344 | * complete callback for urbs |
| 345 | */ |
| 346 | static void snd_complete_urb(struct urb *urb) |
| 347 | { |
| 348 | struct snd_urb_ctx *ctx = urb->context; |
| 349 | struct snd_usb_endpoint *ep = ctx->ep; |
| 350 | int err; |
| 351 | |
| 352 | if (unlikely(urb->status == -ENOENT || /* unlinked */ |
| 353 | urb->status == -ENODEV || /* device removed */ |
| 354 | urb->status == -ECONNRESET || /* unlinked */ |
| 355 | urb->status == -ESHUTDOWN || /* device disabled */ |
| 356 | ep->chip->shutdown)) /* device disconnected */ |
| 357 | goto exit_clear; |
| 358 | |
| 359 | if (usb_pipeout(ep->pipe)) { |
| 360 | retire_outbound_urb(ep, ctx); |
| 361 | /* can be stopped during retire callback */ |
| 362 | if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags))) |
| 363 | goto exit_clear; |
| 364 | |
Eldad Zack | 98ae472 | 2013-04-03 23:18:52 +0200 | [diff] [blame] | 365 | if (snd_usb_endpoint_implicit_feedback_sink(ep)) { |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 366 | unsigned long flags; |
| 367 | |
| 368 | spin_lock_irqsave(&ep->lock, flags); |
| 369 | list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs); |
| 370 | spin_unlock_irqrestore(&ep->lock, flags); |
| 371 | queue_pending_output_urbs(ep); |
| 372 | |
| 373 | goto exit_clear; |
| 374 | } |
| 375 | |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 376 | prepare_outbound_urb(ep, ctx); |
| 377 | } else { |
| 378 | retire_inbound_urb(ep, ctx); |
| 379 | /* can be stopped during retire callback */ |
| 380 | if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags))) |
| 381 | goto exit_clear; |
| 382 | |
| 383 | prepare_inbound_urb(ep, ctx); |
| 384 | } |
| 385 | |
| 386 | err = usb_submit_urb(urb, GFP_ATOMIC); |
| 387 | if (err == 0) |
| 388 | return; |
| 389 | |
| 390 | snd_printk(KERN_ERR "cannot submit urb (err = %d)\n", err); |
| 391 | //snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); |
| 392 | |
| 393 | exit_clear: |
| 394 | clear_bit(ctx->index, &ep->active_mask); |
| 395 | } |
| 396 | |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 397 | /** |
Daniel Mack | 07a5e9d | 2012-04-24 19:31:24 +0200 | [diff] [blame] | 398 | * snd_usb_add_endpoint: Add an endpoint to an USB audio chip |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 399 | * |
| 400 | * @chip: The chip |
| 401 | * @alts: The USB host interface |
| 402 | * @ep_num: The number of the endpoint to use |
| 403 | * @direction: SNDRV_PCM_STREAM_PLAYBACK or SNDRV_PCM_STREAM_CAPTURE |
| 404 | * @type: SND_USB_ENDPOINT_TYPE_DATA or SND_USB_ENDPOINT_TYPE_SYNC |
| 405 | * |
| 406 | * If the requested endpoint has not been added to the given chip before, |
| 407 | * a new instance is created. Otherwise, a pointer to the previoulsy |
| 408 | * created instance is returned. In case of any error, NULL is returned. |
| 409 | * |
| 410 | * New endpoints will be added to chip->ep_list and must be freed by |
| 411 | * calling snd_usb_endpoint_free(). |
| 412 | */ |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 413 | struct snd_usb_endpoint *snd_usb_add_endpoint(struct snd_usb_audio *chip, |
| 414 | struct usb_host_interface *alts, |
| 415 | int ep_num, int direction, int type) |
| 416 | { |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 417 | struct snd_usb_endpoint *ep; |
Daniel Mack | 68e67f4 | 2012-07-12 13:08:40 +0200 | [diff] [blame] | 418 | int is_playback = direction == SNDRV_PCM_STREAM_PLAYBACK; |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 419 | |
Eldad Zack | e7e58df | 2013-08-03 10:51:15 +0200 | [diff] [blame] | 420 | if (WARN_ON(!alts)) |
| 421 | return NULL; |
| 422 | |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 423 | mutex_lock(&chip->mutex); |
| 424 | |
Eldad Zack | 88766f0 | 2013-04-03 23:18:49 +0200 | [diff] [blame] | 425 | list_for_each_entry(ep, &chip->ep_list, list) { |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 426 | if (ep->ep_num == ep_num && |
| 427 | ep->iface == alts->desc.bInterfaceNumber && |
Eldad Zack | df23a24 | 2013-10-06 22:31:13 +0200 | [diff] [blame] | 428 | ep->altsetting == alts->desc.bAlternateSetting) { |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 429 | snd_printdd(KERN_DEBUG "Re-using EP %x in iface %d,%d @%p\n", |
Eldad Zack | df23a24 | 2013-10-06 22:31:13 +0200 | [diff] [blame] | 430 | ep_num, ep->iface, ep->altsetting, ep); |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 431 | goto __exit_unlock; |
| 432 | } |
| 433 | } |
| 434 | |
| 435 | snd_printdd(KERN_DEBUG "Creating new %s %s endpoint #%x\n", |
| 436 | is_playback ? "playback" : "capture", |
| 437 | type == SND_USB_ENDPOINT_TYPE_DATA ? "data" : "sync", |
| 438 | ep_num); |
| 439 | |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 440 | ep = kzalloc(sizeof(*ep), GFP_KERNEL); |
| 441 | if (!ep) |
| 442 | goto __exit_unlock; |
| 443 | |
| 444 | ep->chip = chip; |
| 445 | spin_lock_init(&ep->lock); |
| 446 | ep->type = type; |
| 447 | ep->ep_num = ep_num; |
| 448 | ep->iface = alts->desc.bInterfaceNumber; |
Eldad Zack | df23a24 | 2013-10-06 22:31:13 +0200 | [diff] [blame] | 449 | ep->altsetting = alts->desc.bAlternateSetting; |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 450 | INIT_LIST_HEAD(&ep->ready_playback_urbs); |
| 451 | ep_num &= USB_ENDPOINT_NUMBER_MASK; |
| 452 | |
| 453 | if (is_playback) |
| 454 | ep->pipe = usb_sndisocpipe(chip->dev, ep_num); |
| 455 | else |
| 456 | ep->pipe = usb_rcvisocpipe(chip->dev, ep_num); |
| 457 | |
| 458 | if (type == SND_USB_ENDPOINT_TYPE_SYNC) { |
| 459 | if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && |
| 460 | get_endpoint(alts, 1)->bRefresh >= 1 && |
| 461 | get_endpoint(alts, 1)->bRefresh <= 9) |
| 462 | ep->syncinterval = get_endpoint(alts, 1)->bRefresh; |
| 463 | else if (snd_usb_get_speed(chip->dev) == USB_SPEED_FULL) |
| 464 | ep->syncinterval = 1; |
| 465 | else if (get_endpoint(alts, 1)->bInterval >= 1 && |
| 466 | get_endpoint(alts, 1)->bInterval <= 16) |
| 467 | ep->syncinterval = get_endpoint(alts, 1)->bInterval - 1; |
| 468 | else |
| 469 | ep->syncinterval = 3; |
| 470 | |
| 471 | ep->syncmaxsize = le16_to_cpu(get_endpoint(alts, 1)->wMaxPacketSize); |
| 472 | } |
| 473 | |
| 474 | list_add_tail(&ep->list, &chip->ep_list); |
| 475 | |
| 476 | __exit_unlock: |
| 477 | mutex_unlock(&chip->mutex); |
| 478 | |
| 479 | return ep; |
| 480 | } |
| 481 | |
| 482 | /* |
| 483 | * wait until all urbs are processed. |
| 484 | */ |
| 485 | static int wait_clear_urbs(struct snd_usb_endpoint *ep) |
| 486 | { |
| 487 | unsigned long end_time = jiffies + msecs_to_jiffies(1000); |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 488 | int alive; |
| 489 | |
| 490 | do { |
Joe Perches | 190006f | 2012-11-16 23:35:16 -0800 | [diff] [blame] | 491 | alive = bitmap_weight(&ep->active_mask, ep->nurbs); |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 492 | if (!alive) |
| 493 | break; |
| 494 | |
| 495 | schedule_timeout_uninterruptible(1); |
| 496 | } while (time_before(jiffies, end_time)); |
| 497 | |
| 498 | if (alive) |
| 499 | snd_printk(KERN_ERR "timeout: still %d active urbs on EP #%x\n", |
| 500 | alive, ep->ep_num); |
Takashi Iwai | f58161b | 2012-11-08 08:52:45 +0100 | [diff] [blame] | 501 | clear_bit(EP_FLAG_STOPPING, &ep->flags); |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 502 | |
| 503 | return 0; |
| 504 | } |
| 505 | |
Takashi Iwai | f58161b | 2012-11-08 08:52:45 +0100 | [diff] [blame] | 506 | /* sync the pending stop operation; |
| 507 | * this function itself doesn't trigger the stop operation |
| 508 | */ |
| 509 | void snd_usb_endpoint_sync_pending_stop(struct snd_usb_endpoint *ep) |
| 510 | { |
| 511 | if (ep && test_bit(EP_FLAG_STOPPING, &ep->flags)) |
| 512 | wait_clear_urbs(ep); |
| 513 | } |
| 514 | |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 515 | /* |
| 516 | * unlink active urbs. |
| 517 | */ |
Takashi Iwai | ccc1696 | 2012-11-21 08:22:52 +0100 | [diff] [blame] | 518 | static int deactivate_urbs(struct snd_usb_endpoint *ep, bool force) |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 519 | { |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 520 | unsigned int i; |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 521 | |
| 522 | if (!force && ep->chip->shutdown) /* to be sure... */ |
| 523 | return -EBADFD; |
| 524 | |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 525 | clear_bit(EP_FLAG_RUNNING, &ep->flags); |
| 526 | |
| 527 | INIT_LIST_HEAD(&ep->ready_playback_urbs); |
| 528 | ep->next_packet_read_pos = 0; |
| 529 | ep->next_packet_write_pos = 0; |
| 530 | |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 531 | for (i = 0; i < ep->nurbs; i++) { |
| 532 | if (test_bit(i, &ep->active_mask)) { |
| 533 | if (!test_and_set_bit(i, &ep->unlink_mask)) { |
| 534 | struct urb *u = ep->urb[i].urb; |
Takashi Iwai | ccc1696 | 2012-11-21 08:22:52 +0100 | [diff] [blame] | 535 | usb_unlink_urb(u); |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 536 | } |
| 537 | } |
| 538 | } |
| 539 | |
| 540 | return 0; |
| 541 | } |
| 542 | |
| 543 | /* |
| 544 | * release an endpoint's urbs |
| 545 | */ |
| 546 | static void release_urbs(struct snd_usb_endpoint *ep, int force) |
| 547 | { |
| 548 | int i; |
| 549 | |
| 550 | /* route incoming urbs to nirvana */ |
| 551 | ep->retire_data_urb = NULL; |
| 552 | ep->prepare_data_urb = NULL; |
| 553 | |
| 554 | /* stop urbs */ |
Takashi Iwai | ccc1696 | 2012-11-21 08:22:52 +0100 | [diff] [blame] | 555 | deactivate_urbs(ep, force); |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 556 | wait_clear_urbs(ep); |
| 557 | |
| 558 | for (i = 0; i < ep->nurbs; i++) |
| 559 | release_urb_ctx(&ep->urb[i]); |
| 560 | |
| 561 | if (ep->syncbuf) |
| 562 | usb_free_coherent(ep->chip->dev, SYNC_URBS * 4, |
| 563 | ep->syncbuf, ep->sync_dma); |
| 564 | |
| 565 | ep->syncbuf = NULL; |
| 566 | ep->nurbs = 0; |
| 567 | } |
| 568 | |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 569 | /* |
| 570 | * configure a data endpoint |
| 571 | */ |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 572 | static int data_ep_set_params(struct snd_usb_endpoint *ep, |
Dylan Reid | 35ec7aa2 | 2012-09-18 09:49:47 -0700 | [diff] [blame] | 573 | snd_pcm_format_t pcm_format, |
| 574 | unsigned int channels, |
| 575 | unsigned int period_bytes, |
Alan Stern | 976b6c0 | 2013-09-24 15:51:58 -0400 | [diff] [blame] | 576 | unsigned int frames_per_period, |
| 577 | unsigned int periods_per_buffer, |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 578 | struct audioformat *fmt, |
| 579 | struct snd_usb_endpoint *sync_ep) |
| 580 | { |
Alan Stern | 976b6c0 | 2013-09-24 15:51:58 -0400 | [diff] [blame] | 581 | unsigned int maxsize, minsize, packs_per_ms, max_packs_per_urb; |
| 582 | unsigned int max_packs_per_period, urbs_per_period, urb_packs; |
| 583 | unsigned int max_urbs, i; |
Dylan Reid | 35ec7aa2 | 2012-09-18 09:49:47 -0700 | [diff] [blame] | 584 | int frame_bits = snd_pcm_format_physical_width(pcm_format) * channels; |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 585 | |
Daniel Mack | d24f506 | 2013-04-17 00:01:38 +0800 | [diff] [blame] | 586 | if (pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE && fmt->dsd_dop) { |
| 587 | /* |
| 588 | * When operating in DSD DOP mode, the size of a sample frame |
| 589 | * in hardware differs from the actual physical format width |
| 590 | * because we need to make room for the DOP markers. |
| 591 | */ |
| 592 | frame_bits += channels << 3; |
| 593 | } |
| 594 | |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 595 | ep->datainterval = fmt->datainterval; |
| 596 | ep->stride = frame_bits >> 3; |
Dylan Reid | 35ec7aa2 | 2012-09-18 09:49:47 -0700 | [diff] [blame] | 597 | ep->silence_value = pcm_format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0; |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 598 | |
Clemens Ladisch | 57e6dae | 2013-08-08 11:24:55 +0200 | [diff] [blame] | 599 | /* assume max. frequency is 25% higher than nominal */ |
| 600 | ep->freqmax = ep->freqn + (ep->freqn >> 2); |
| 601 | maxsize = ((ep->freqmax + 0xffff) * (frame_bits >> 3)) |
| 602 | >> (16 - ep->datainterval); |
| 603 | /* but wMaxPacketSize might reduce this */ |
| 604 | if (ep->maxpacksize && ep->maxpacksize < maxsize) { |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 605 | /* whatever fits into a max. size packet */ |
| 606 | maxsize = ep->maxpacksize; |
| 607 | ep->freqmax = (maxsize / (frame_bits >> 3)) |
| 608 | << (16 - ep->datainterval); |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 609 | } |
| 610 | |
| 611 | if (ep->fill_max) |
| 612 | ep->curpacksize = ep->maxpacksize; |
| 613 | else |
| 614 | ep->curpacksize = maxsize; |
| 615 | |
Alan Stern | 976b6c0 | 2013-09-24 15:51:58 -0400 | [diff] [blame] | 616 | if (snd_usb_get_speed(ep->chip->dev) != USB_SPEED_FULL) { |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 617 | packs_per_ms = 8 >> ep->datainterval; |
Alan Stern | 976b6c0 | 2013-09-24 15:51:58 -0400 | [diff] [blame] | 618 | max_packs_per_urb = MAX_PACKS_HS; |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 619 | } else { |
Alan Stern | 976b6c0 | 2013-09-24 15:51:58 -0400 | [diff] [blame] | 620 | packs_per_ms = 1; |
| 621 | max_packs_per_urb = MAX_PACKS; |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 622 | } |
Eldad Zack | 98ae472 | 2013-04-03 23:18:52 +0200 | [diff] [blame] | 623 | if (sync_ep && !snd_usb_endpoint_implicit_feedback_sink(ep)) |
Alan Stern | 976b6c0 | 2013-09-24 15:51:58 -0400 | [diff] [blame] | 624 | max_packs_per_urb = min(max_packs_per_urb, |
| 625 | 1U << sync_ep->syncinterval); |
| 626 | max_packs_per_urb = max(1u, max_packs_per_urb >> ep->datainterval); |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 627 | |
Alan Stern | 976b6c0 | 2013-09-24 15:51:58 -0400 | [diff] [blame] | 628 | /* |
| 629 | * Capture endpoints need to use small URBs because there's no way |
| 630 | * to tell in advance where the next period will end, and we don't |
| 631 | * want the next URB to complete much after the period ends. |
| 632 | * |
| 633 | * Playback endpoints with implicit sync much use the same parameters |
| 634 | * as their corresponding capture endpoint. |
| 635 | */ |
| 636 | if (usb_pipein(ep->pipe) || |
| 637 | snd_usb_endpoint_implicit_feedback_sink(ep)) { |
| 638 | |
Thomas Pugliese | a93455e | 2013-11-26 13:58:15 -0600 | [diff] [blame] | 639 | urb_packs = packs_per_ms; |
| 640 | /* |
| 641 | * Wireless devices can poll at a max rate of once per 4ms. |
| 642 | * For dataintervals less than 5, increase the packet count to |
| 643 | * allow the host controller to use bursting to fill in the |
| 644 | * gaps. |
| 645 | */ |
| 646 | if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_WIRELESS) { |
| 647 | int interval = ep->datainterval; |
| 648 | while (interval < 5) { |
| 649 | urb_packs <<= 1; |
| 650 | ++interval; |
| 651 | } |
| 652 | } |
Alan Stern | 976b6c0 | 2013-09-24 15:51:58 -0400 | [diff] [blame] | 653 | /* make capture URBs <= 1 ms and smaller than a period */ |
Thomas Pugliese | a93455e | 2013-11-26 13:58:15 -0600 | [diff] [blame] | 654 | urb_packs = min(max_packs_per_urb, urb_packs); |
Alan Stern | 976b6c0 | 2013-09-24 15:51:58 -0400 | [diff] [blame] | 655 | while (urb_packs > 1 && urb_packs * maxsize >= period_bytes) |
| 656 | urb_packs >>= 1; |
| 657 | ep->nurbs = MAX_URBS; |
| 658 | |
| 659 | /* |
| 660 | * Playback endpoints without implicit sync are adjusted so that |
| 661 | * a period fits as evenly as possible in the smallest number of |
| 662 | * URBs. The total number of URBs is adjusted to the size of the |
| 663 | * ALSA buffer, subject to the MAX_URBS and MAX_QUEUE limits. |
| 664 | */ |
| 665 | } else { |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 666 | /* determine how small a packet can be */ |
Alan Stern | 976b6c0 | 2013-09-24 15:51:58 -0400 | [diff] [blame] | 667 | minsize = (ep->freqn >> (16 - ep->datainterval)) * |
| 668 | (frame_bits >> 3); |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 669 | /* with sync from device, assume it can be 12% lower */ |
| 670 | if (sync_ep) |
| 671 | minsize -= minsize >> 3; |
| 672 | minsize = max(minsize, 1u); |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 673 | |
Alan Stern | 976b6c0 | 2013-09-24 15:51:58 -0400 | [diff] [blame] | 674 | /* how many packets will contain an entire ALSA period? */ |
| 675 | max_packs_per_period = DIV_ROUND_UP(period_bytes, minsize); |
| 676 | |
| 677 | /* how many URBs will contain a period? */ |
| 678 | urbs_per_period = DIV_ROUND_UP(max_packs_per_period, |
| 679 | max_packs_per_urb); |
| 680 | /* how many packets are needed in each URB? */ |
| 681 | urb_packs = DIV_ROUND_UP(max_packs_per_period, urbs_per_period); |
| 682 | |
| 683 | /* limit the number of frames in a single URB */ |
| 684 | ep->max_urb_frames = DIV_ROUND_UP(frames_per_period, |
| 685 | urbs_per_period); |
| 686 | |
| 687 | /* try to use enough URBs to contain an entire ALSA buffer */ |
| 688 | max_urbs = min((unsigned) MAX_URBS, |
| 689 | MAX_QUEUE * packs_per_ms / urb_packs); |
| 690 | ep->nurbs = min(max_urbs, urbs_per_period * periods_per_buffer); |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 691 | } |
| 692 | |
| 693 | /* allocate and initialize data urbs */ |
| 694 | for (i = 0; i < ep->nurbs; i++) { |
| 695 | struct snd_urb_ctx *u = &ep->urb[i]; |
| 696 | u->index = i; |
| 697 | u->ep = ep; |
Alan Stern | 976b6c0 | 2013-09-24 15:51:58 -0400 | [diff] [blame] | 698 | u->packets = urb_packs; |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 699 | u->buffer_size = maxsize * u->packets; |
| 700 | |
| 701 | if (fmt->fmt_type == UAC_FORMAT_TYPE_II) |
| 702 | u->packets++; /* for transfer delimiter */ |
| 703 | u->urb = usb_alloc_urb(u->packets, GFP_KERNEL); |
| 704 | if (!u->urb) |
| 705 | goto out_of_memory; |
| 706 | |
| 707 | u->urb->transfer_buffer = |
| 708 | usb_alloc_coherent(ep->chip->dev, u->buffer_size, |
| 709 | GFP_KERNEL, &u->urb->transfer_dma); |
| 710 | if (!u->urb->transfer_buffer) |
| 711 | goto out_of_memory; |
| 712 | u->urb->pipe = ep->pipe; |
Clemens Ladisch | c75c5ab | 2013-04-27 12:10:32 +0200 | [diff] [blame] | 713 | u->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 714 | u->urb->interval = 1 << ep->datainterval; |
| 715 | u->urb->context = u; |
| 716 | u->urb->complete = snd_complete_urb; |
| 717 | INIT_LIST_HEAD(&u->ready_list); |
| 718 | } |
| 719 | |
| 720 | return 0; |
| 721 | |
| 722 | out_of_memory: |
| 723 | release_urbs(ep, 0); |
| 724 | return -ENOMEM; |
| 725 | } |
| 726 | |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 727 | /* |
| 728 | * configure a sync endpoint |
| 729 | */ |
Eldad Zack | 9372103 | 2013-10-06 22:31:06 +0200 | [diff] [blame] | 730 | static int sync_ep_set_params(struct snd_usb_endpoint *ep) |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 731 | { |
| 732 | int i; |
| 733 | |
| 734 | ep->syncbuf = usb_alloc_coherent(ep->chip->dev, SYNC_URBS * 4, |
| 735 | GFP_KERNEL, &ep->sync_dma); |
| 736 | if (!ep->syncbuf) |
| 737 | return -ENOMEM; |
| 738 | |
| 739 | for (i = 0; i < SYNC_URBS; i++) { |
| 740 | struct snd_urb_ctx *u = &ep->urb[i]; |
| 741 | u->index = i; |
| 742 | u->ep = ep; |
| 743 | u->packets = 1; |
| 744 | u->urb = usb_alloc_urb(1, GFP_KERNEL); |
| 745 | if (!u->urb) |
| 746 | goto out_of_memory; |
| 747 | u->urb->transfer_buffer = ep->syncbuf + i * 4; |
| 748 | u->urb->transfer_dma = ep->sync_dma + i * 4; |
| 749 | u->urb->transfer_buffer_length = 4; |
| 750 | u->urb->pipe = ep->pipe; |
Clemens Ladisch | c75c5ab | 2013-04-27 12:10:32 +0200 | [diff] [blame] | 751 | u->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 752 | u->urb->number_of_packets = 1; |
| 753 | u->urb->interval = 1 << ep->syncinterval; |
| 754 | u->urb->context = u; |
| 755 | u->urb->complete = snd_complete_urb; |
| 756 | } |
| 757 | |
| 758 | ep->nurbs = SYNC_URBS; |
| 759 | |
| 760 | return 0; |
| 761 | |
| 762 | out_of_memory: |
| 763 | release_urbs(ep, 0); |
| 764 | return -ENOMEM; |
| 765 | } |
| 766 | |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 767 | /** |
Daniel Mack | 07a5e9d | 2012-04-24 19:31:24 +0200 | [diff] [blame] | 768 | * snd_usb_endpoint_set_params: configure an snd_usb_endpoint |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 769 | * |
Daniel Mack | 07a5e9d | 2012-04-24 19:31:24 +0200 | [diff] [blame] | 770 | * @ep: the snd_usb_endpoint to configure |
Dylan Reid | 35ec7aa2 | 2012-09-18 09:49:47 -0700 | [diff] [blame] | 771 | * @pcm_format: the audio fomat. |
| 772 | * @channels: the number of audio channels. |
| 773 | * @period_bytes: the number of bytes in one alsa period. |
Alan Stern | 976b6c0 | 2013-09-24 15:51:58 -0400 | [diff] [blame] | 774 | * @period_frames: the number of frames in one alsa period. |
| 775 | * @buffer_periods: the number of periods in one alsa buffer. |
Dylan Reid | 35ec7aa2 | 2012-09-18 09:49:47 -0700 | [diff] [blame] | 776 | * @rate: the frame rate. |
Daniel Mack | 07a5e9d | 2012-04-24 19:31:24 +0200 | [diff] [blame] | 777 | * @fmt: the USB audio format information |
| 778 | * @sync_ep: the sync endpoint to use, if any |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 779 | * |
Daniel Mack | 07a5e9d | 2012-04-24 19:31:24 +0200 | [diff] [blame] | 780 | * Determine the number of URBs to be used on this endpoint. |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 781 | * An endpoint must be configured before it can be started. |
| 782 | * An endpoint that is already running can not be reconfigured. |
| 783 | */ |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 784 | int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep, |
Dylan Reid | 35ec7aa2 | 2012-09-18 09:49:47 -0700 | [diff] [blame] | 785 | snd_pcm_format_t pcm_format, |
| 786 | unsigned int channels, |
| 787 | unsigned int period_bytes, |
Alan Stern | 976b6c0 | 2013-09-24 15:51:58 -0400 | [diff] [blame] | 788 | unsigned int period_frames, |
| 789 | unsigned int buffer_periods, |
Dylan Reid | 35ec7aa2 | 2012-09-18 09:49:47 -0700 | [diff] [blame] | 790 | unsigned int rate, |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 791 | struct audioformat *fmt, |
| 792 | struct snd_usb_endpoint *sync_ep) |
| 793 | { |
| 794 | int err; |
| 795 | |
| 796 | if (ep->use_count != 0) { |
| 797 | snd_printk(KERN_WARNING "Unable to change format on ep #%x: already in use\n", |
| 798 | ep->ep_num); |
| 799 | return -EBUSY; |
| 800 | } |
| 801 | |
| 802 | /* release old buffers, if any */ |
| 803 | release_urbs(ep, 0); |
| 804 | |
| 805 | ep->datainterval = fmt->datainterval; |
| 806 | ep->maxpacksize = fmt->maxpacksize; |
Takashi Iwai | 85f7193 | 2012-04-13 12:41:54 +0200 | [diff] [blame] | 807 | ep->fill_max = !!(fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX); |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 808 | |
| 809 | if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_FULL) |
Dylan Reid | 35ec7aa2 | 2012-09-18 09:49:47 -0700 | [diff] [blame] | 810 | ep->freqn = get_usb_full_speed_rate(rate); |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 811 | else |
Dylan Reid | 35ec7aa2 | 2012-09-18 09:49:47 -0700 | [diff] [blame] | 812 | ep->freqn = get_usb_high_speed_rate(rate); |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 813 | |
| 814 | /* calculate the frequency in 16.16 format */ |
| 815 | ep->freqm = ep->freqn; |
| 816 | ep->freqshift = INT_MIN; |
| 817 | |
| 818 | ep->phase = 0; |
| 819 | |
| 820 | switch (ep->type) { |
| 821 | case SND_USB_ENDPOINT_TYPE_DATA: |
Dylan Reid | 35ec7aa2 | 2012-09-18 09:49:47 -0700 | [diff] [blame] | 822 | err = data_ep_set_params(ep, pcm_format, channels, |
Alan Stern | 976b6c0 | 2013-09-24 15:51:58 -0400 | [diff] [blame] | 823 | period_bytes, period_frames, |
| 824 | buffer_periods, fmt, sync_ep); |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 825 | break; |
| 826 | case SND_USB_ENDPOINT_TYPE_SYNC: |
Eldad Zack | 9372103 | 2013-10-06 22:31:06 +0200 | [diff] [blame] | 827 | err = sync_ep_set_params(ep); |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 828 | break; |
| 829 | default: |
| 830 | err = -EINVAL; |
| 831 | } |
| 832 | |
| 833 | snd_printdd(KERN_DEBUG "Setting params for ep #%x (type %d, %d urbs), ret=%d\n", |
| 834 | ep->ep_num, ep->type, ep->nurbs, err); |
| 835 | |
| 836 | return err; |
| 837 | } |
| 838 | |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 839 | /** |
| 840 | * snd_usb_endpoint_start: start an snd_usb_endpoint |
| 841 | * |
Daniel Mack | 015618b | 2012-08-29 13:17:05 +0200 | [diff] [blame] | 842 | * @ep: the endpoint to start |
| 843 | * @can_sleep: flag indicating whether the operation is executed in |
| 844 | * non-atomic context |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 845 | * |
| 846 | * A call to this function will increment the use count of the endpoint. |
Daniel Mack | 07a5e9d | 2012-04-24 19:31:24 +0200 | [diff] [blame] | 847 | * In case it is not already running, the URBs for this endpoint will be |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 848 | * submitted. Otherwise, this function does nothing. |
| 849 | * |
| 850 | * Must be balanced to calls of snd_usb_endpoint_stop(). |
| 851 | * |
| 852 | * Returns an error if the URB submission failed, 0 in all other cases. |
| 853 | */ |
Takashi Iwai | a9bb362 | 2012-11-20 18:32:06 +0100 | [diff] [blame] | 854 | int snd_usb_endpoint_start(struct snd_usb_endpoint *ep, bool can_sleep) |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 855 | { |
| 856 | int err; |
| 857 | unsigned int i; |
| 858 | |
| 859 | if (ep->chip->shutdown) |
| 860 | return -EBADFD; |
| 861 | |
| 862 | /* already running? */ |
| 863 | if (++ep->use_count != 1) |
| 864 | return 0; |
| 865 | |
Daniel Mack | 015618b | 2012-08-29 13:17:05 +0200 | [diff] [blame] | 866 | /* just to be sure */ |
Takashi Iwai | ccc1696 | 2012-11-21 08:22:52 +0100 | [diff] [blame] | 867 | deactivate_urbs(ep, false); |
Daniel Mack | 015618b | 2012-08-29 13:17:05 +0200 | [diff] [blame] | 868 | if (can_sleep) |
| 869 | wait_clear_urbs(ep); |
| 870 | |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 871 | ep->active_mask = 0; |
| 872 | ep->unlink_mask = 0; |
| 873 | ep->phase = 0; |
| 874 | |
Daniel Mack | 2b58fd5 | 2012-09-04 10:23:07 +0200 | [diff] [blame] | 875 | snd_usb_endpoint_start_quirk(ep); |
| 876 | |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 877 | /* |
| 878 | * If this endpoint has a data endpoint as implicit feedback source, |
| 879 | * don't start the urbs here. Instead, mark them all as available, |
Daniel Mack | 07a5e9d | 2012-04-24 19:31:24 +0200 | [diff] [blame] | 880 | * wait for the record urbs to return and queue the playback urbs |
| 881 | * from that context. |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 882 | */ |
| 883 | |
| 884 | set_bit(EP_FLAG_RUNNING, &ep->flags); |
| 885 | |
Eldad Zack | 98ae472 | 2013-04-03 23:18:52 +0200 | [diff] [blame] | 886 | if (snd_usb_endpoint_implicit_feedback_sink(ep)) { |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 887 | for (i = 0; i < ep->nurbs; i++) { |
| 888 | struct snd_urb_ctx *ctx = ep->urb + i; |
| 889 | list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs); |
| 890 | } |
| 891 | |
| 892 | return 0; |
| 893 | } |
| 894 | |
| 895 | for (i = 0; i < ep->nurbs; i++) { |
| 896 | struct urb *urb = ep->urb[i].urb; |
| 897 | |
| 898 | if (snd_BUG_ON(!urb)) |
| 899 | goto __error; |
| 900 | |
| 901 | if (usb_pipeout(ep->pipe)) { |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 902 | prepare_outbound_urb(ep, urb->context); |
| 903 | } else { |
| 904 | prepare_inbound_urb(ep, urb->context); |
| 905 | } |
| 906 | |
| 907 | err = usb_submit_urb(urb, GFP_ATOMIC); |
| 908 | if (err < 0) { |
| 909 | snd_printk(KERN_ERR "cannot submit urb %d, error %d: %s\n", |
| 910 | i, err, usb_error_string(err)); |
| 911 | goto __error; |
| 912 | } |
| 913 | set_bit(i, &ep->active_mask); |
| 914 | } |
| 915 | |
| 916 | return 0; |
| 917 | |
| 918 | __error: |
| 919 | clear_bit(EP_FLAG_RUNNING, &ep->flags); |
| 920 | ep->use_count--; |
Takashi Iwai | ccc1696 | 2012-11-21 08:22:52 +0100 | [diff] [blame] | 921 | deactivate_urbs(ep, false); |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 922 | return -EPIPE; |
| 923 | } |
| 924 | |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 925 | /** |
| 926 | * snd_usb_endpoint_stop: stop an snd_usb_endpoint |
| 927 | * |
| 928 | * @ep: the endpoint to stop (may be NULL) |
| 929 | * |
| 930 | * A call to this function will decrement the use count of the endpoint. |
| 931 | * In case the last user has requested the endpoint stop, the URBs will |
Daniel Mack | 07a5e9d | 2012-04-24 19:31:24 +0200 | [diff] [blame] | 932 | * actually be deactivated. |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 933 | * |
| 934 | * Must be balanced to calls of snd_usb_endpoint_start(). |
Takashi Iwai | b2eb950 | 2012-11-21 08:30:48 +0100 | [diff] [blame] | 935 | * |
| 936 | * The caller needs to synchronize the pending stop operation via |
| 937 | * snd_usb_endpoint_sync_pending_stop(). |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 938 | */ |
Takashi Iwai | b2eb950 | 2012-11-21 08:30:48 +0100 | [diff] [blame] | 939 | void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep) |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 940 | { |
| 941 | if (!ep) |
| 942 | return; |
| 943 | |
| 944 | if (snd_BUG_ON(ep->use_count == 0)) |
| 945 | return; |
| 946 | |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 947 | if (--ep->use_count == 0) { |
Takashi Iwai | ccc1696 | 2012-11-21 08:22:52 +0100 | [diff] [blame] | 948 | deactivate_urbs(ep, false); |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 949 | ep->data_subs = NULL; |
| 950 | ep->sync_slave = NULL; |
| 951 | ep->retire_data_urb = NULL; |
| 952 | ep->prepare_data_urb = NULL; |
Takashi Iwai | b2eb950 | 2012-11-21 08:30:48 +0100 | [diff] [blame] | 953 | set_bit(EP_FLAG_STOPPING, &ep->flags); |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 954 | } |
| 955 | } |
| 956 | |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 957 | /** |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 958 | * snd_usb_endpoint_deactivate: deactivate an snd_usb_endpoint |
| 959 | * |
| 960 | * @ep: the endpoint to deactivate |
| 961 | * |
Eldad Zack | 9b7c552 | 2013-10-06 22:31:10 +0200 | [diff] [blame] | 962 | * If the endpoint is not currently in use, this functions will |
| 963 | * deactivate its associated URBs. |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 964 | * |
| 965 | * In case of any active users, this functions does nothing. |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 966 | */ |
Eldad Zack | 9b7c552 | 2013-10-06 22:31:10 +0200 | [diff] [blame] | 967 | void snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep) |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 968 | { |
| 969 | if (!ep) |
Eldad Zack | 9b7c552 | 2013-10-06 22:31:10 +0200 | [diff] [blame] | 970 | return; |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 971 | |
| 972 | if (ep->use_count != 0) |
Eldad Zack | 9b7c552 | 2013-10-06 22:31:10 +0200 | [diff] [blame] | 973 | return; |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 974 | |
Eldad Zack | 239b9f7 | 2013-10-06 22:31:09 +0200 | [diff] [blame] | 975 | deactivate_urbs(ep, true); |
| 976 | wait_clear_urbs(ep); |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 977 | } |
| 978 | |
Daniel Mack | 07a5e9d | 2012-04-24 19:31:24 +0200 | [diff] [blame] | 979 | /** |
| 980 | * snd_usb_endpoint_free: Free the resources of an snd_usb_endpoint |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 981 | * |
| 982 | * @ep: the list header of the endpoint to free |
| 983 | * |
| 984 | * This function does not care for the endpoint's use count but will tear |
| 985 | * down all the streaming URBs immediately and free all resources. |
| 986 | */ |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 987 | void snd_usb_endpoint_free(struct list_head *head) |
| 988 | { |
| 989 | struct snd_usb_endpoint *ep; |
| 990 | |
| 991 | ep = list_entry(head, struct snd_usb_endpoint, list); |
| 992 | release_urbs(ep, 1); |
| 993 | kfree(ep); |
| 994 | } |
| 995 | |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 996 | /** |
| 997 | * snd_usb_handle_sync_urb: parse an USB sync packet |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 998 | * |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 999 | * @ep: the endpoint to handle the packet |
| 1000 | * @sender: the sending endpoint |
| 1001 | * @urb: the received packet |
| 1002 | * |
| 1003 | * This function is called from the context of an endpoint that received |
| 1004 | * the packet and is used to let another endpoint object handle the payload. |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 1005 | */ |
| 1006 | void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep, |
| 1007 | struct snd_usb_endpoint *sender, |
| 1008 | const struct urb *urb) |
| 1009 | { |
| 1010 | int shift; |
| 1011 | unsigned int f; |
| 1012 | unsigned long flags; |
| 1013 | |
| 1014 | snd_BUG_ON(ep == sender); |
| 1015 | |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 1016 | /* |
| 1017 | * In case the endpoint is operating in implicit feedback mode, prepare |
Daniel Mack | 07a5e9d | 2012-04-24 19:31:24 +0200 | [diff] [blame] | 1018 | * a new outbound URB that has the same layout as the received packet |
| 1019 | * and add it to the list of pending urbs. queue_pending_output_urbs() |
| 1020 | * will take care of them later. |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 1021 | */ |
Eldad Zack | 98ae472 | 2013-04-03 23:18:52 +0200 | [diff] [blame] | 1022 | if (snd_usb_endpoint_implicit_feedback_sink(ep) && |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 1023 | ep->use_count != 0) { |
| 1024 | |
| 1025 | /* implicit feedback case */ |
| 1026 | int i, bytes = 0; |
| 1027 | struct snd_urb_ctx *in_ctx; |
| 1028 | struct snd_usb_packet_info *out_packet; |
| 1029 | |
| 1030 | in_ctx = urb->context; |
| 1031 | |
| 1032 | /* Count overall packet size */ |
| 1033 | for (i = 0; i < in_ctx->packets; i++) |
| 1034 | if (urb->iso_frame_desc[i].status == 0) |
| 1035 | bytes += urb->iso_frame_desc[i].actual_length; |
| 1036 | |
| 1037 | /* |
| 1038 | * skip empty packets. At least M-Audio's Fast Track Ultra stops |
| 1039 | * streaming once it received a 0-byte OUT URB |
| 1040 | */ |
| 1041 | if (bytes == 0) |
| 1042 | return; |
| 1043 | |
| 1044 | spin_lock_irqsave(&ep->lock, flags); |
| 1045 | out_packet = ep->next_packet + ep->next_packet_write_pos; |
| 1046 | |
| 1047 | /* |
| 1048 | * Iterate through the inbound packet and prepare the lengths |
| 1049 | * for the output packet. The OUT packet we are about to send |
Eldad Zack | 28acb12 | 2012-11-28 23:55:34 +0100 | [diff] [blame] | 1050 | * will have the same amount of payload bytes per stride as the |
| 1051 | * IN packet we just received. Since the actual size is scaled |
| 1052 | * by the stride, use the sender stride to calculate the length |
| 1053 | * in case the number of channels differ between the implicitly |
| 1054 | * fed-back endpoint and the synchronizing endpoint. |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 1055 | */ |
| 1056 | |
| 1057 | out_packet->packets = in_ctx->packets; |
| 1058 | for (i = 0; i < in_ctx->packets; i++) { |
| 1059 | if (urb->iso_frame_desc[i].status == 0) |
| 1060 | out_packet->packet_size[i] = |
Eldad Zack | 28acb12 | 2012-11-28 23:55:34 +0100 | [diff] [blame] | 1061 | urb->iso_frame_desc[i].actual_length / sender->stride; |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 1062 | else |
| 1063 | out_packet->packet_size[i] = 0; |
| 1064 | } |
| 1065 | |
| 1066 | ep->next_packet_write_pos++; |
| 1067 | ep->next_packet_write_pos %= MAX_URBS; |
| 1068 | spin_unlock_irqrestore(&ep->lock, flags); |
| 1069 | queue_pending_output_urbs(ep); |
| 1070 | |
| 1071 | return; |
| 1072 | } |
| 1073 | |
Daniel Mack | 94c2721 | 2012-04-12 13:51:15 +0200 | [diff] [blame] | 1074 | /* |
| 1075 | * process after playback sync complete |
| 1076 | * |
| 1077 | * Full speed devices report feedback values in 10.14 format as samples |
| 1078 | * per frame, high speed devices in 16.16 format as samples per |
| 1079 | * microframe. |
| 1080 | * |
| 1081 | * Because the Audio Class 1 spec was written before USB 2.0, many high |
| 1082 | * speed devices use a wrong interpretation, some others use an |
| 1083 | * entirely different format. |
| 1084 | * |
| 1085 | * Therefore, we cannot predict what format any particular device uses |
| 1086 | * and must detect it automatically. |
| 1087 | */ |
Daniel Mack | 8fdff6a | 2012-04-12 13:51:11 +0200 | [diff] [blame] | 1088 | |
| 1089 | if (urb->iso_frame_desc[0].status != 0 || |
| 1090 | urb->iso_frame_desc[0].actual_length < 3) |
| 1091 | return; |
| 1092 | |
| 1093 | f = le32_to_cpup(urb->transfer_buffer); |
| 1094 | if (urb->iso_frame_desc[0].actual_length == 3) |
| 1095 | f &= 0x00ffffff; |
| 1096 | else |
| 1097 | f &= 0x0fffffff; |
| 1098 | |
| 1099 | if (f == 0) |
| 1100 | return; |
| 1101 | |
| 1102 | if (unlikely(ep->freqshift == INT_MIN)) { |
| 1103 | /* |
| 1104 | * The first time we see a feedback value, determine its format |
| 1105 | * by shifting it left or right until it matches the nominal |
| 1106 | * frequency value. This assumes that the feedback does not |
| 1107 | * differ from the nominal value more than +50% or -25%. |
| 1108 | */ |
| 1109 | shift = 0; |
| 1110 | while (f < ep->freqn - ep->freqn / 4) { |
| 1111 | f <<= 1; |
| 1112 | shift++; |
| 1113 | } |
| 1114 | while (f > ep->freqn + ep->freqn / 2) { |
| 1115 | f >>= 1; |
| 1116 | shift--; |
| 1117 | } |
| 1118 | ep->freqshift = shift; |
| 1119 | } else if (ep->freqshift >= 0) |
| 1120 | f <<= ep->freqshift; |
| 1121 | else |
| 1122 | f >>= -ep->freqshift; |
| 1123 | |
| 1124 | if (likely(f >= ep->freqn - ep->freqn / 8 && f <= ep->freqmax)) { |
| 1125 | /* |
| 1126 | * If the frequency looks valid, set it. |
| 1127 | * This value is referred to in prepare_playback_urb(). |
| 1128 | */ |
| 1129 | spin_lock_irqsave(&ep->lock, flags); |
| 1130 | ep->freqm = f; |
| 1131 | spin_unlock_irqrestore(&ep->lock, flags); |
| 1132 | } else { |
| 1133 | /* |
| 1134 | * Out of range; maybe the shift value is wrong. |
| 1135 | * Reset it so that we autodetect again the next time. |
| 1136 | */ |
| 1137 | ep->freqshift = INT_MIN; |
| 1138 | } |
| 1139 | } |
| 1140 | |