]>
Commit | Line | Data |
---|---|---|
c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
269c11fb AW |
2 | /* |
3 | * ALSA PCM device for the | |
4 | * ALSA interface to ivtv PCM capture streams | |
5 | * | |
6 | * Copyright (C) 2009,2012 Andy Walls <awalls@md.metrocast.net> | |
7 | * Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com> | |
8 | * | |
9 | * Portions of this work were sponsored by ONELAN Limited for the cx18 driver | |
269c11fb AW |
10 | */ |
11 | ||
269c11fb AW |
12 | #include "ivtv-driver.h" |
13 | #include "ivtv-queue.h" | |
14 | #include "ivtv-streams.h" | |
15 | #include "ivtv-fileops.h" | |
16 | #include "ivtv-alsa.h" | |
2aebbf67 | 17 | #include "ivtv-alsa-pcm.h" |
269c11fb | 18 | |
bbdba43f MCC |
19 | #include <linux/vmalloc.h> |
20 | ||
21 | #include <sound/core.h> | |
22 | #include <sound/pcm.h> | |
23 | ||
24 | ||
269c11fb AW |
25 | static unsigned int pcm_debug; |
26 | module_param(pcm_debug, int, 0644); | |
27 | MODULE_PARM_DESC(pcm_debug, "enable debug messages for pcm"); | |
28 | ||
29 | #define dprintk(fmt, arg...) \ | |
30 | do { \ | |
31 | if (pcm_debug) \ | |
32 | pr_info("ivtv-alsa-pcm %s: " fmt, __func__, ##arg); \ | |
33 | } while (0) | |
34 | ||
47f14314 | 35 | static const struct snd_pcm_hardware snd_ivtv_hw_capture = { |
269c11fb AW |
36 | .info = SNDRV_PCM_INFO_BLOCK_TRANSFER | |
37 | SNDRV_PCM_INFO_MMAP | | |
38 | SNDRV_PCM_INFO_INTERLEAVED | | |
39 | SNDRV_PCM_INFO_MMAP_VALID, | |
40 | ||
41 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
42 | ||
43 | .rates = SNDRV_PCM_RATE_48000, | |
44 | ||
45 | .rate_min = 48000, | |
46 | .rate_max = 48000, | |
47 | .channels_min = 2, | |
48 | .channels_max = 2, | |
49 | .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */ | |
50 | .period_bytes_min = 64, /* 12544/2, */ | |
51 | .period_bytes_max = 12544, | |
52 | .periods_min = 2, | |
53 | .periods_max = 98, /* 12544, */ | |
54 | }; | |
55 | ||
2aebbf67 MCC |
56 | static void ivtv_alsa_announce_pcm_data(struct snd_ivtv_card *itvsc, |
57 | u8 *pcm_data, | |
58 | size_t num_bytes) | |
269c11fb AW |
59 | { |
60 | struct snd_pcm_substream *substream; | |
61 | struct snd_pcm_runtime *runtime; | |
62 | unsigned int oldptr; | |
63 | unsigned int stride; | |
64 | int period_elapsed = 0; | |
65 | int length; | |
66 | ||
339f06c5 | 67 | dprintk("ivtv alsa announce ptr=%p data=%p num_bytes=%zu\n", itvsc, |
269c11fb AW |
68 | pcm_data, num_bytes); |
69 | ||
70 | substream = itvsc->capture_pcm_substream; | |
71 | if (substream == NULL) { | |
72 | dprintk("substream was NULL\n"); | |
73 | return; | |
74 | } | |
75 | ||
76 | runtime = substream->runtime; | |
77 | if (runtime == NULL) { | |
78 | dprintk("runtime was NULL\n"); | |
79 | return; | |
80 | } | |
81 | ||
82 | stride = runtime->frame_bits >> 3; | |
83 | if (stride == 0) { | |
84 | dprintk("stride is zero\n"); | |
85 | return; | |
86 | } | |
87 | ||
88 | length = num_bytes / stride; | |
89 | if (length == 0) { | |
90 | dprintk("%s: length was zero\n", __func__); | |
91 | return; | |
92 | } | |
93 | ||
94 | if (runtime->dma_area == NULL) { | |
95 | dprintk("dma area was NULL - ignoring\n"); | |
96 | return; | |
97 | } | |
98 | ||
99 | oldptr = itvsc->hwptr_done_capture; | |
100 | if (oldptr + length >= runtime->buffer_size) { | |
101 | unsigned int cnt = | |
102 | runtime->buffer_size - oldptr; | |
103 | memcpy(runtime->dma_area + oldptr * stride, pcm_data, | |
104 | cnt * stride); | |
105 | memcpy(runtime->dma_area, pcm_data + cnt * stride, | |
106 | length * stride - cnt * stride); | |
107 | } else { | |
108 | memcpy(runtime->dma_area + oldptr * stride, pcm_data, | |
109 | length * stride); | |
110 | } | |
111 | snd_pcm_stream_lock(substream); | |
112 | ||
113 | itvsc->hwptr_done_capture += length; | |
114 | if (itvsc->hwptr_done_capture >= | |
115 | runtime->buffer_size) | |
116 | itvsc->hwptr_done_capture -= | |
117 | runtime->buffer_size; | |
118 | ||
119 | itvsc->capture_transfer_done += length; | |
120 | if (itvsc->capture_transfer_done >= | |
121 | runtime->period_size) { | |
122 | itvsc->capture_transfer_done -= | |
123 | runtime->period_size; | |
124 | period_elapsed = 1; | |
125 | } | |
126 | ||
127 | snd_pcm_stream_unlock(substream); | |
128 | ||
129 | if (period_elapsed) | |
130 | snd_pcm_period_elapsed(substream); | |
131 | } | |
132 | ||
133 | static int snd_ivtv_pcm_capture_open(struct snd_pcm_substream *substream) | |
134 | { | |
135 | struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream); | |
136 | struct snd_pcm_runtime *runtime = substream->runtime; | |
137 | struct v4l2_device *v4l2_dev = itvsc->v4l2_dev; | |
138 | struct ivtv *itv = to_ivtv(v4l2_dev); | |
139 | struct ivtv_stream *s; | |
140 | struct ivtv_open_id item; | |
141 | int ret; | |
142 | ||
143 | /* Instruct the CX2341[56] to start sending packets */ | |
144 | snd_ivtv_lock(itvsc); | |
deb29e90 TI |
145 | |
146 | if (ivtv_init_on_first_open(itv)) { | |
147 | snd_ivtv_unlock(itvsc); | |
148 | return -ENXIO; | |
149 | } | |
150 | ||
269c11fb AW |
151 | s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM]; |
152 | ||
635d62f0 | 153 | v4l2_fh_init(&item.fh, &s->vdev); |
269c11fb AW |
154 | item.itv = itv; |
155 | item.type = s->type; | |
156 | ||
157 | /* See if the stream is available */ | |
158 | if (ivtv_claim_stream(&item, item.type)) { | |
159 | /* No, it's already in use */ | |
c5b81fe3 | 160 | v4l2_fh_exit(&item.fh); |
269c11fb AW |
161 | snd_ivtv_unlock(itvsc); |
162 | return -EBUSY; | |
163 | } | |
164 | ||
165 | if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) || | |
166 | test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) { | |
167 | /* We're already streaming. No additional action required */ | |
168 | snd_ivtv_unlock(itvsc); | |
169 | return 0; | |
170 | } | |
171 | ||
172 | ||
173 | runtime->hw = snd_ivtv_hw_capture; | |
174 | snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); | |
175 | itvsc->capture_pcm_substream = substream; | |
176 | runtime->private_data = itv; | |
177 | ||
178 | itv->pcm_announce_callback = ivtv_alsa_announce_pcm_data; | |
179 | ||
180 | /* Not currently streaming, so start it up */ | |
181 | set_bit(IVTV_F_S_STREAMING, &s->s_flags); | |
182 | ret = ivtv_start_v4l2_encode_stream(s); | |
183 | snd_ivtv_unlock(itvsc); | |
184 | ||
185 | return ret; | |
186 | } | |
187 | ||
188 | static int snd_ivtv_pcm_capture_close(struct snd_pcm_substream *substream) | |
189 | { | |
190 | struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream); | |
191 | struct v4l2_device *v4l2_dev = itvsc->v4l2_dev; | |
192 | struct ivtv *itv = to_ivtv(v4l2_dev); | |
193 | struct ivtv_stream *s; | |
194 | ||
195 | /* Instruct the ivtv to stop sending packets */ | |
196 | snd_ivtv_lock(itvsc); | |
197 | s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM]; | |
198 | ivtv_stop_v4l2_encode_stream(s, 0); | |
199 | clear_bit(IVTV_F_S_STREAMING, &s->s_flags); | |
200 | ||
201 | ivtv_release_stream(s); | |
202 | ||
203 | itv->pcm_announce_callback = NULL; | |
204 | snd_ivtv_unlock(itvsc); | |
205 | ||
206 | return 0; | |
207 | } | |
208 | ||
209 | static int snd_ivtv_pcm_ioctl(struct snd_pcm_substream *substream, | |
210 | unsigned int cmd, void *arg) | |
211 | { | |
212 | struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream); | |
213 | int ret; | |
214 | ||
215 | snd_ivtv_lock(itvsc); | |
216 | ret = snd_pcm_lib_ioctl(substream, cmd, arg); | |
217 | snd_ivtv_unlock(itvsc); | |
218 | return ret; | |
219 | } | |
220 | ||
221 | ||
222 | static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, | |
223 | size_t size) | |
224 | { | |
225 | struct snd_pcm_runtime *runtime = subs->runtime; | |
226 | ||
227 | dprintk("Allocating vbuffer\n"); | |
228 | if (runtime->dma_area) { | |
229 | if (runtime->dma_bytes > size) | |
230 | return 0; | |
231 | ||
232 | vfree(runtime->dma_area); | |
233 | } | |
234 | runtime->dma_area = vmalloc(size); | |
235 | if (!runtime->dma_area) | |
236 | return -ENOMEM; | |
237 | ||
238 | runtime->dma_bytes = size; | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
243 | static int snd_ivtv_pcm_hw_params(struct snd_pcm_substream *substream, | |
244 | struct snd_pcm_hw_params *params) | |
245 | { | |
246 | dprintk("%s called\n", __func__); | |
247 | ||
248 | return snd_pcm_alloc_vmalloc_buffer(substream, | |
249 | params_buffer_bytes(params)); | |
250 | } | |
251 | ||
252 | static int snd_ivtv_pcm_hw_free(struct snd_pcm_substream *substream) | |
253 | { | |
254 | struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream); | |
255 | unsigned long flags; | |
d989dc20 | 256 | unsigned char *dma_area = NULL; |
269c11fb AW |
257 | |
258 | spin_lock_irqsave(&itvsc->slock, flags); | |
259 | if (substream->runtime->dma_area) { | |
260 | dprintk("freeing pcm capture region\n"); | |
d989dc20 | 261 | dma_area = substream->runtime->dma_area; |
269c11fb AW |
262 | substream->runtime->dma_area = NULL; |
263 | } | |
264 | spin_unlock_irqrestore(&itvsc->slock, flags); | |
d989dc20 | 265 | vfree(dma_area); |
269c11fb AW |
266 | |
267 | return 0; | |
268 | } | |
269 | ||
270 | static int snd_ivtv_pcm_prepare(struct snd_pcm_substream *substream) | |
271 | { | |
272 | struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream); | |
273 | ||
274 | itvsc->hwptr_done_capture = 0; | |
275 | itvsc->capture_transfer_done = 0; | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | static int snd_ivtv_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
281 | { | |
282 | return 0; | |
283 | } | |
284 | ||
285 | static | |
286 | snd_pcm_uframes_t snd_ivtv_pcm_pointer(struct snd_pcm_substream *substream) | |
287 | { | |
288 | unsigned long flags; | |
289 | snd_pcm_uframes_t hwptr_done; | |
290 | struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream); | |
291 | ||
292 | spin_lock_irqsave(&itvsc->slock, flags); | |
293 | hwptr_done = itvsc->hwptr_done_capture; | |
294 | spin_unlock_irqrestore(&itvsc->slock, flags); | |
295 | ||
296 | return hwptr_done; | |
297 | } | |
298 | ||
299 | static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs, | |
300 | unsigned long offset) | |
301 | { | |
302 | void *pageptr = subs->runtime->dma_area + offset; | |
303 | ||
304 | return vmalloc_to_page(pageptr); | |
305 | } | |
306 | ||
5c8d8c01 | 307 | static const struct snd_pcm_ops snd_ivtv_pcm_capture_ops = { |
269c11fb AW |
308 | .open = snd_ivtv_pcm_capture_open, |
309 | .close = snd_ivtv_pcm_capture_close, | |
310 | .ioctl = snd_ivtv_pcm_ioctl, | |
311 | .hw_params = snd_ivtv_pcm_hw_params, | |
312 | .hw_free = snd_ivtv_pcm_hw_free, | |
313 | .prepare = snd_ivtv_pcm_prepare, | |
314 | .trigger = snd_ivtv_pcm_trigger, | |
315 | .pointer = snd_ivtv_pcm_pointer, | |
316 | .page = snd_pcm_get_vmalloc_page, | |
317 | }; | |
318 | ||
319 | int snd_ivtv_pcm_create(struct snd_ivtv_card *itvsc) | |
320 | { | |
321 | struct snd_pcm *sp; | |
322 | struct snd_card *sc = itvsc->sc; | |
323 | struct v4l2_device *v4l2_dev = itvsc->v4l2_dev; | |
324 | struct ivtv *itv = to_ivtv(v4l2_dev); | |
325 | int ret; | |
326 | ||
327 | ret = snd_pcm_new(sc, "CX2341[56] PCM", | |
328 | 0, /* PCM device 0, the only one for this card */ | |
329 | 0, /* 0 playback substreams */ | |
330 | 1, /* 1 capture substream */ | |
331 | &sp); | |
332 | if (ret) { | |
333 | IVTV_ALSA_ERR("%s: snd_ivtv_pcm_create() failed with err %d\n", | |
334 | __func__, ret); | |
335 | goto err_exit; | |
336 | } | |
337 | ||
338 | spin_lock_init(&itvsc->slock); | |
339 | ||
340 | snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_CAPTURE, | |
341 | &snd_ivtv_pcm_capture_ops); | |
342 | sp->info_flags = 0; | |
343 | sp->private_data = itvsc; | |
c0decac1 | 344 | strscpy(sp->name, itv->card_name, sizeof(sp->name)); |
269c11fb AW |
345 | |
346 | return 0; | |
347 | ||
348 | err_exit: | |
349 | return ret; | |
350 | } |