Andy Walls | f9b071c | 2009-06-24 07:26:45 -0300 | [diff] [blame] | 1 | /* |
| 2 | * ALSA PCM device for the |
| 3 | * ALSA interface to cx18 PCM capture streams |
| 4 | * |
| 5 | * Copyright (C) 2009 Andy Walls <awalls@radix.net> |
Devin Heitmueller | 9972de9 | 2010-01-18 21:29:51 -0300 | [diff] [blame] | 6 | * Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com> |
| 7 | * |
| 8 | * Portions of this work were sponsored by ONELAN Limited. |
Andy Walls | f9b071c | 2009-06-24 07:26:45 -0300 | [diff] [blame] | 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 23 | * 02111-1307 USA |
| 24 | */ |
| 25 | |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/kernel.h> |
| 28 | |
| 29 | #include <media/v4l2-device.h> |
| 30 | |
| 31 | #include <sound/core.h> |
| 32 | #include <sound/pcm.h> |
| 33 | |
| 34 | #include "cx18-driver.h" |
Devin Heitmueller | 9972de9 | 2010-01-18 21:29:51 -0300 | [diff] [blame] | 35 | #include "cx18-queue.h" |
| 36 | #include "cx18-streams.h" |
| 37 | #include "cx18-fileops.h" |
Andy Walls | f9b071c | 2009-06-24 07:26:45 -0300 | [diff] [blame] | 38 | #include "cx18-alsa.h" |
| 39 | |
Devin Heitmueller | 71036ef | 2009-12-20 23:50:02 -0300 | [diff] [blame^] | 40 | static unsigned int pcm_debug; |
| 41 | module_param(pcm_debug, int, 0644); |
| 42 | MODULE_PARM_DESC(pcm_debug, "enable debug messages for pcm"); |
Devin Heitmueller | 9972de9 | 2010-01-18 21:29:51 -0300 | [diff] [blame] | 43 | |
| 44 | #define dprintk(fmt, arg...) do { \ |
Devin Heitmueller | 71036ef | 2009-12-20 23:50:02 -0300 | [diff] [blame^] | 45 | if (pcm_debug) \ |
| 46 | printk(KERN_INFO "cx18-alsa-pcm %s: " fmt, \ |
Devin Heitmueller | 9972de9 | 2010-01-18 21:29:51 -0300 | [diff] [blame] | 47 | __func__, ##arg); \ |
| 48 | } while (0) |
| 49 | |
| 50 | /* Forward Declaration */ |
| 51 | void cx18_alsa_announce_pcm_data(struct snd_cx18_card *cxsc, u8 *pcm_data, |
| 52 | size_t num_bytes); |
| 53 | |
| 54 | static struct snd_pcm_hardware snd_cx18_hw_capture = { |
| 55 | .info = SNDRV_PCM_INFO_BLOCK_TRANSFER | |
| 56 | SNDRV_PCM_INFO_MMAP | |
| 57 | SNDRV_PCM_INFO_INTERLEAVED | |
| 58 | SNDRV_PCM_INFO_MMAP_VALID, |
| 59 | |
| 60 | .formats = SNDRV_PCM_FMTBIT_S16_LE, |
| 61 | |
| 62 | .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT, |
| 63 | |
| 64 | .rate_min = 48000, |
| 65 | .rate_max = 48000, |
| 66 | .channels_min = 2, |
| 67 | .channels_max = 2, |
| 68 | .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */ |
| 69 | .period_bytes_min = 64, /* 12544/2, */ |
| 70 | .period_bytes_max = 12544, |
| 71 | .periods_min = 2, |
| 72 | .periods_max = 98, /* 12544, */ |
| 73 | }; |
| 74 | |
Andy Walls | f9b071c | 2009-06-24 07:26:45 -0300 | [diff] [blame] | 75 | static int snd_cx18_pcm_capture_open(struct snd_pcm_substream *substream) |
| 76 | { |
| 77 | struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream); |
| 78 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 79 | struct v4l2_device *v4l2_dev = cxsc->v4l2_dev; |
Andy Walls | f9b071c | 2009-06-24 07:26:45 -0300 | [diff] [blame] | 80 | struct cx18 *cx = to_cx18(v4l2_dev); |
Devin Heitmueller | 9972de9 | 2010-01-18 21:29:51 -0300 | [diff] [blame] | 81 | struct cx18_stream *s; |
| 82 | struct cx18_open_id *item; |
| 83 | int ret; |
| 84 | |
| 85 | /* Instruct the cx18 to start sending packets */ |
| 86 | s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM]; |
| 87 | |
| 88 | /* Allocate memory */ |
| 89 | item = kmalloc(sizeof(struct cx18_open_id), GFP_KERNEL); |
Devin Heitmueller | 780edb7 | 2009-12-20 23:15:58 -0300 | [diff] [blame] | 90 | if (NULL == item) |
Devin Heitmueller | 9972de9 | 2010-01-18 21:29:51 -0300 | [diff] [blame] | 91 | return -ENOMEM; |
Devin Heitmueller | 780edb7 | 2009-12-20 23:15:58 -0300 | [diff] [blame] | 92 | |
Devin Heitmueller | 9972de9 | 2010-01-18 21:29:51 -0300 | [diff] [blame] | 93 | item->cx = cx; |
| 94 | item->type = s->type; |
| 95 | item->open_id = cx->open_id++; |
| 96 | |
| 97 | /* See if the stream is available */ |
| 98 | if (cx18_claim_stream(item, item->type)) { |
| 99 | /* No, it's already in use */ |
Devin Heitmueller | 1a8e0e3 | 2009-12-12 17:38:53 -0300 | [diff] [blame] | 100 | kfree(item); |
Devin Heitmueller | 9972de9 | 2010-01-18 21:29:51 -0300 | [diff] [blame] | 101 | return -EBUSY; |
| 102 | } |
| 103 | |
| 104 | if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) || |
| 105 | test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) { |
| 106 | /* We're already streaming. No additional action required */ |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | |
| 111 | runtime->hw = snd_cx18_hw_capture; |
| 112 | snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); |
| 113 | cxsc->capture_pcm_substream = substream; |
| 114 | runtime->private_data = cx; |
| 115 | |
| 116 | cx->pcm_announce_callback = cx18_alsa_announce_pcm_data; |
| 117 | |
| 118 | /* Not currently streaming, so start it up */ |
| 119 | set_bit(CX18_F_S_STREAMING, &s->s_flags); |
| 120 | ret = cx18_start_v4l2_encode_stream(s); |
| 121 | |
Andy Walls | f9b071c | 2009-06-24 07:26:45 -0300 | [diff] [blame] | 122 | return 0; |
| 123 | } |
| 124 | |
| 125 | static int snd_cx18_pcm_capture_close(struct snd_pcm_substream *substream) |
| 126 | { |
Devin Heitmueller | 9972de9 | 2010-01-18 21:29:51 -0300 | [diff] [blame] | 127 | unsigned long flags; |
| 128 | struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream); |
| 129 | struct v4l2_device *v4l2_dev = cxsc->v4l2_dev; |
| 130 | struct cx18 *cx = to_cx18(v4l2_dev); |
| 131 | struct cx18_stream *s; |
| 132 | int ret; |
| 133 | |
| 134 | /* Instruct the cx18 to stop sending packets */ |
| 135 | s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM]; |
| 136 | ret = cx18_stop_v4l2_encode_stream(s, 0); |
| 137 | clear_bit(CX18_F_S_STREAMING, &s->s_flags); |
| 138 | |
| 139 | cx18_release_stream(s); |
| 140 | |
| 141 | cx->pcm_announce_callback = NULL; |
| 142 | |
| 143 | spin_lock_irqsave(&cxsc->slock, flags); |
| 144 | if (substream->runtime->dma_area) { |
| 145 | dprintk("freeing pcm capture region\n"); |
| 146 | vfree(substream->runtime->dma_area); |
| 147 | substream->runtime->dma_area = NULL; |
| 148 | } |
| 149 | spin_unlock_irqrestore(&cxsc->slock, flags); |
| 150 | |
Andy Walls | f9b071c | 2009-06-24 07:26:45 -0300 | [diff] [blame] | 151 | return 0; |
| 152 | } |
| 153 | |
| 154 | static int snd_cx18_pcm_ioctl(struct snd_pcm_substream *substream, |
| 155 | unsigned int cmd, void *arg) |
| 156 | { |
| 157 | return snd_pcm_lib_ioctl(substream, cmd, arg); |
| 158 | } |
| 159 | |
Devin Heitmueller | 9972de9 | 2010-01-18 21:29:51 -0300 | [diff] [blame] | 160 | |
| 161 | static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, |
| 162 | size_t size) |
| 163 | { |
| 164 | struct snd_pcm_runtime *runtime = subs->runtime; |
| 165 | |
| 166 | dprintk("Allocating vbuffer\n"); |
| 167 | if (runtime->dma_area) { |
| 168 | if (runtime->dma_bytes > size) |
| 169 | return 0; |
| 170 | |
| 171 | vfree(runtime->dma_area); |
| 172 | } |
| 173 | runtime->dma_area = vmalloc(size); |
| 174 | if (!runtime->dma_area) |
| 175 | return -ENOMEM; |
| 176 | |
| 177 | runtime->dma_bytes = size; |
| 178 | |
| 179 | return 0; |
| 180 | } |
| 181 | |
Andy Walls | f9b071c | 2009-06-24 07:26:45 -0300 | [diff] [blame] | 182 | static int snd_cx18_pcm_hw_params(struct snd_pcm_substream *substream, |
| 183 | struct snd_pcm_hw_params *params) |
| 184 | { |
Devin Heitmueller | 9972de9 | 2010-01-18 21:29:51 -0300 | [diff] [blame] | 185 | int ret; |
| 186 | |
| 187 | dprintk("%s called\n", __func__); |
| 188 | |
| 189 | ret = snd_pcm_alloc_vmalloc_buffer(substream, |
| 190 | params_buffer_bytes(params)); |
Andy Walls | f9b071c | 2009-06-24 07:26:45 -0300 | [diff] [blame] | 191 | return 0; |
| 192 | } |
| 193 | |
| 194 | static int snd_cx18_pcm_hw_free(struct snd_pcm_substream *substream) |
| 195 | { |
| 196 | return 0; |
| 197 | } |
| 198 | |
| 199 | static int snd_cx18_pcm_prepare(struct snd_pcm_substream *substream) |
| 200 | { |
Devin Heitmueller | 9972de9 | 2010-01-18 21:29:51 -0300 | [diff] [blame] | 201 | struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream); |
| 202 | |
| 203 | cxsc->hwptr_done_capture = 0; |
| 204 | cxsc->capture_transfer_done = 0; |
| 205 | |
Andy Walls | f9b071c | 2009-06-24 07:26:45 -0300 | [diff] [blame] | 206 | return 0; |
| 207 | } |
| 208 | |
| 209 | static int snd_cx18_pcm_trigger(struct snd_pcm_substream *substream, int cmd) |
| 210 | { |
| 211 | return 0; |
| 212 | } |
| 213 | |
| 214 | static |
| 215 | snd_pcm_uframes_t snd_cx18_pcm_pointer(struct snd_pcm_substream *substream) |
| 216 | { |
Devin Heitmueller | 9972de9 | 2010-01-18 21:29:51 -0300 | [diff] [blame] | 217 | unsigned long flags; |
| 218 | snd_pcm_uframes_t hwptr_done; |
| 219 | struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream); |
| 220 | |
| 221 | spin_lock_irqsave(&cxsc->slock, flags); |
| 222 | hwptr_done = cxsc->hwptr_done_capture; |
| 223 | spin_unlock_irqrestore(&cxsc->slock, flags); |
| 224 | |
| 225 | return hwptr_done; |
| 226 | } |
| 227 | |
Devin Heitmueller | 9972de9 | 2010-01-18 21:29:51 -0300 | [diff] [blame] | 228 | static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs, |
| 229 | unsigned long offset) |
| 230 | { |
| 231 | void *pageptr = subs->runtime->dma_area + offset; |
| 232 | |
| 233 | return vmalloc_to_page(pageptr); |
Andy Walls | f9b071c | 2009-06-24 07:26:45 -0300 | [diff] [blame] | 234 | } |
| 235 | |
| 236 | static struct snd_pcm_ops snd_cx18_pcm_capture_ops = { |
| 237 | .open = snd_cx18_pcm_capture_open, |
| 238 | .close = snd_cx18_pcm_capture_close, |
| 239 | .ioctl = snd_cx18_pcm_ioctl, |
| 240 | .hw_params = snd_cx18_pcm_hw_params, |
| 241 | .hw_free = snd_cx18_pcm_hw_free, |
| 242 | .prepare = snd_cx18_pcm_prepare, |
| 243 | .trigger = snd_cx18_pcm_trigger, |
| 244 | .pointer = snd_cx18_pcm_pointer, |
Devin Heitmueller | 9972de9 | 2010-01-18 21:29:51 -0300 | [diff] [blame] | 245 | .page = snd_pcm_get_vmalloc_page, |
Andy Walls | f9b071c | 2009-06-24 07:26:45 -0300 | [diff] [blame] | 246 | }; |
| 247 | |
Devin Heitmueller | 9972de9 | 2010-01-18 21:29:51 -0300 | [diff] [blame] | 248 | void cx18_alsa_announce_pcm_data(struct snd_cx18_card *cxsc, u8 *pcm_data, |
| 249 | size_t num_bytes) |
| 250 | { |
| 251 | struct snd_pcm_substream *substream; |
| 252 | struct snd_pcm_runtime *runtime; |
| 253 | unsigned int oldptr; |
| 254 | unsigned int stride; |
| 255 | int period_elapsed = 0; |
| 256 | int length; |
| 257 | |
| 258 | dprintk("cx18 alsa announce ptr=%p data=%p num_bytes=%d\n", cxsc, |
| 259 | pcm_data, num_bytes); |
| 260 | |
| 261 | substream = cxsc->capture_pcm_substream; |
| 262 | if (substream == NULL) { |
| 263 | dprintk("substream was NULL\n"); |
| 264 | return; |
| 265 | } |
| 266 | |
| 267 | runtime = substream->runtime; |
| 268 | if (runtime == NULL) { |
| 269 | dprintk("runtime was NULL\n"); |
| 270 | return; |
| 271 | } |
| 272 | |
| 273 | stride = runtime->frame_bits >> 3; |
| 274 | if (stride == 0) { |
| 275 | dprintk("stride is zero\n"); |
| 276 | return; |
| 277 | } |
| 278 | |
| 279 | length = num_bytes / stride; |
| 280 | if (length == 0) { |
| 281 | dprintk("%s: length was zero\n", __func__); |
| 282 | return; |
| 283 | } |
| 284 | |
| 285 | if (runtime->dma_area == NULL) { |
| 286 | dprintk("dma area was NULL - ignoring\n"); |
| 287 | return; |
| 288 | } |
| 289 | |
| 290 | oldptr = cxsc->hwptr_done_capture; |
| 291 | if (oldptr + length >= runtime->buffer_size) { |
| 292 | unsigned int cnt = |
| 293 | runtime->buffer_size - oldptr; |
| 294 | memcpy(runtime->dma_area + oldptr * stride, pcm_data, |
| 295 | cnt * stride); |
| 296 | memcpy(runtime->dma_area, pcm_data + cnt * stride, |
| 297 | length * stride - cnt * stride); |
| 298 | } else { |
| 299 | memcpy(runtime->dma_area + oldptr * stride, pcm_data, |
| 300 | length * stride); |
| 301 | } |
| 302 | snd_pcm_stream_lock(substream); |
| 303 | |
| 304 | cxsc->hwptr_done_capture += length; |
| 305 | if (cxsc->hwptr_done_capture >= |
| 306 | runtime->buffer_size) |
| 307 | cxsc->hwptr_done_capture -= |
| 308 | runtime->buffer_size; |
| 309 | |
| 310 | cxsc->capture_transfer_done += length; |
| 311 | if (cxsc->capture_transfer_done >= |
| 312 | runtime->period_size) { |
| 313 | cxsc->capture_transfer_done -= |
| 314 | runtime->period_size; |
| 315 | period_elapsed = 1; |
| 316 | } |
| 317 | |
| 318 | snd_pcm_stream_unlock(substream); |
| 319 | |
| 320 | if (period_elapsed) |
| 321 | snd_pcm_period_elapsed(substream); |
| 322 | } |
| 323 | |
| 324 | int snd_cx18_pcm_create(struct snd_cx18_card *cxsc) |
Andy Walls | f9b071c | 2009-06-24 07:26:45 -0300 | [diff] [blame] | 325 | { |
| 326 | struct snd_pcm *sp; |
| 327 | struct snd_card *sc = cxsc->sc; |
| 328 | struct v4l2_device *v4l2_dev = cxsc->v4l2_dev; |
| 329 | struct cx18 *cx = to_cx18(v4l2_dev); |
| 330 | int ret; |
| 331 | |
| 332 | ret = snd_pcm_new(sc, "CX23418 PCM", |
| 333 | 0, /* PCM device 0, the only one for this card */ |
| 334 | 0, /* 0 playback substreams */ |
| 335 | 1, /* 1 capture substream */ |
| 336 | &sp); |
| 337 | if (ret) { |
| 338 | CX18_ALSA_ERR("%s: snd_cx18_pcm_create() failed with err %d\n", |
| 339 | __func__, ret); |
| 340 | goto err_exit; |
| 341 | } |
Devin Heitmueller | 9972de9 | 2010-01-18 21:29:51 -0300 | [diff] [blame] | 342 | |
| 343 | spin_lock_init(&cxsc->slock); |
| 344 | |
Devin Heitmueller | 780edb7 | 2009-12-20 23:15:58 -0300 | [diff] [blame] | 345 | snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_CAPTURE, |
| 346 | &snd_cx18_pcm_capture_ops); |
Devin Heitmueller | 9972de9 | 2010-01-18 21:29:51 -0300 | [diff] [blame] | 347 | sp->info_flags = 0; |
| 348 | sp->private_data = cxsc; |
Devin Heitmueller | 5eb9978 | 2009-11-20 02:15:20 -0300 | [diff] [blame] | 349 | strlcpy(sp->name, cx->card_name, sizeof(sp->name)); |
Devin Heitmueller | 9972de9 | 2010-01-18 21:29:51 -0300 | [diff] [blame] | 350 | |
Andy Walls | f9b071c | 2009-06-24 07:26:45 -0300 | [diff] [blame] | 351 | return 0; |
| 352 | |
| 353 | err_exit: |
| 354 | return ret; |
| 355 | } |