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21#include "ivtv-driver.h"
22#include "ivtv-queue.h"
23#include "ivtv-streams.h"
24#include "ivtv-fileops.h"
25#include "ivtv-alsa.h"
26#include "ivtv-alsa-pcm.h"
27
28#include <linux/vmalloc.h>
29
30#include <sound/core.h>
31#include <sound/pcm.h>
32
33
34static unsigned int pcm_debug;
35module_param(pcm_debug, int, 0644);
36MODULE_PARM_DESC(pcm_debug, "enable debug messages for pcm");
37
38#define dprintk(fmt, arg...) \
39 do { \
40 if (pcm_debug) \
41 pr_info("ivtv-alsa-pcm %s: " fmt, __func__, ##arg); \
42 } while (0)
43
44static const struct snd_pcm_hardware snd_ivtv_hw_capture = {
45 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
46 SNDRV_PCM_INFO_MMAP |
47 SNDRV_PCM_INFO_INTERLEAVED |
48 SNDRV_PCM_INFO_MMAP_VALID,
49
50 .formats = SNDRV_PCM_FMTBIT_S16_LE,
51
52 .rates = SNDRV_PCM_RATE_48000,
53
54 .rate_min = 48000,
55 .rate_max = 48000,
56 .channels_min = 2,
57 .channels_max = 2,
58 .buffer_bytes_max = 62720 * 8,
59 .period_bytes_min = 64,
60 .period_bytes_max = 12544,
61 .periods_min = 2,
62 .periods_max = 98,
63};
64
65static void ivtv_alsa_announce_pcm_data(struct snd_ivtv_card *itvsc,
66 u8 *pcm_data,
67 size_t num_bytes)
68{
69 struct snd_pcm_substream *substream;
70 struct snd_pcm_runtime *runtime;
71 unsigned int oldptr;
72 unsigned int stride;
73 int period_elapsed = 0;
74 int length;
75
76 dprintk("ivtv alsa announce ptr=%p data=%p num_bytes=%zu\n", itvsc,
77 pcm_data, num_bytes);
78
79 substream = itvsc->capture_pcm_substream;
80 if (substream == NULL) {
81 dprintk("substream was NULL\n");
82 return;
83 }
84
85 runtime = substream->runtime;
86 if (runtime == NULL) {
87 dprintk("runtime was NULL\n");
88 return;
89 }
90
91 stride = runtime->frame_bits >> 3;
92 if (stride == 0) {
93 dprintk("stride is zero\n");
94 return;
95 }
96
97 length = num_bytes / stride;
98 if (length == 0) {
99 dprintk("%s: length was zero\n", __func__);
100 return;
101 }
102
103 if (runtime->dma_area == NULL) {
104 dprintk("dma area was NULL - ignoring\n");
105 return;
106 }
107
108 oldptr = itvsc->hwptr_done_capture;
109 if (oldptr + length >= runtime->buffer_size) {
110 unsigned int cnt =
111 runtime->buffer_size - oldptr;
112 memcpy(runtime->dma_area + oldptr * stride, pcm_data,
113 cnt * stride);
114 memcpy(runtime->dma_area, pcm_data + cnt * stride,
115 length * stride - cnt * stride);
116 } else {
117 memcpy(runtime->dma_area + oldptr * stride, pcm_data,
118 length * stride);
119 }
120 snd_pcm_stream_lock(substream);
121
122 itvsc->hwptr_done_capture += length;
123 if (itvsc->hwptr_done_capture >=
124 runtime->buffer_size)
125 itvsc->hwptr_done_capture -=
126 runtime->buffer_size;
127
128 itvsc->capture_transfer_done += length;
129 if (itvsc->capture_transfer_done >=
130 runtime->period_size) {
131 itvsc->capture_transfer_done -=
132 runtime->period_size;
133 period_elapsed = 1;
134 }
135
136 snd_pcm_stream_unlock(substream);
137
138 if (period_elapsed)
139 snd_pcm_period_elapsed(substream);
140}
141
142static int snd_ivtv_pcm_capture_open(struct snd_pcm_substream *substream)
143{
144 struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
145 struct snd_pcm_runtime *runtime = substream->runtime;
146 struct v4l2_device *v4l2_dev = itvsc->v4l2_dev;
147 struct ivtv *itv = to_ivtv(v4l2_dev);
148 struct ivtv_stream *s;
149 struct ivtv_open_id item;
150 int ret;
151
152
153 snd_ivtv_lock(itvsc);
154
155 if (ivtv_init_on_first_open(itv)) {
156 snd_ivtv_unlock(itvsc);
157 return -ENXIO;
158 }
159
160 s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];
161
162 v4l2_fh_init(&item.fh, &s->vdev);
163 item.itv = itv;
164 item.type = s->type;
165
166
167 if (ivtv_claim_stream(&item, item.type)) {
168
169 v4l2_fh_exit(&item.fh);
170 snd_ivtv_unlock(itvsc);
171 return -EBUSY;
172 }
173
174 if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) ||
175 test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
176
177 snd_ivtv_unlock(itvsc);
178 return 0;
179 }
180
181
182 runtime->hw = snd_ivtv_hw_capture;
183 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
184 itvsc->capture_pcm_substream = substream;
185 runtime->private_data = itv;
186
187 itv->pcm_announce_callback = ivtv_alsa_announce_pcm_data;
188
189
190 set_bit(IVTV_F_S_STREAMING, &s->s_flags);
191 ret = ivtv_start_v4l2_encode_stream(s);
192 snd_ivtv_unlock(itvsc);
193
194 return ret;
195}
196
197static int snd_ivtv_pcm_capture_close(struct snd_pcm_substream *substream)
198{
199 struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
200 struct v4l2_device *v4l2_dev = itvsc->v4l2_dev;
201 struct ivtv *itv = to_ivtv(v4l2_dev);
202 struct ivtv_stream *s;
203
204
205 snd_ivtv_lock(itvsc);
206 s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];
207 ivtv_stop_v4l2_encode_stream(s, 0);
208 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
209
210 ivtv_release_stream(s);
211
212 itv->pcm_announce_callback = NULL;
213 snd_ivtv_unlock(itvsc);
214
215 return 0;
216}
217
218static int snd_ivtv_pcm_ioctl(struct snd_pcm_substream *substream,
219 unsigned int cmd, void *arg)
220{
221 struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
222 int ret;
223
224 snd_ivtv_lock(itvsc);
225 ret = snd_pcm_lib_ioctl(substream, cmd, arg);
226 snd_ivtv_unlock(itvsc);
227 return ret;
228}
229
230
231static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
232 size_t size)
233{
234 struct snd_pcm_runtime *runtime = subs->runtime;
235
236 dprintk("Allocating vbuffer\n");
237 if (runtime->dma_area) {
238 if (runtime->dma_bytes > size)
239 return 0;
240
241 vfree(runtime->dma_area);
242 }
243 runtime->dma_area = vmalloc(size);
244 if (!runtime->dma_area)
245 return -ENOMEM;
246
247 runtime->dma_bytes = size;
248
249 return 0;
250}
251
252static int snd_ivtv_pcm_hw_params(struct snd_pcm_substream *substream,
253 struct snd_pcm_hw_params *params)
254{
255 dprintk("%s called\n", __func__);
256
257 return snd_pcm_alloc_vmalloc_buffer(substream,
258 params_buffer_bytes(params));
259}
260
261static int snd_ivtv_pcm_hw_free(struct snd_pcm_substream *substream)
262{
263 struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
264 unsigned long flags;
265 unsigned char *dma_area = NULL;
266
267 spin_lock_irqsave(&itvsc->slock, flags);
268 if (substream->runtime->dma_area) {
269 dprintk("freeing pcm capture region\n");
270 dma_area = substream->runtime->dma_area;
271 substream->runtime->dma_area = NULL;
272 }
273 spin_unlock_irqrestore(&itvsc->slock, flags);
274 vfree(dma_area);
275
276 return 0;
277}
278
279static int snd_ivtv_pcm_prepare(struct snd_pcm_substream *substream)
280{
281 struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
282
283 itvsc->hwptr_done_capture = 0;
284 itvsc->capture_transfer_done = 0;
285
286 return 0;
287}
288
289static int snd_ivtv_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
290{
291 return 0;
292}
293
294static
295snd_pcm_uframes_t snd_ivtv_pcm_pointer(struct snd_pcm_substream *substream)
296{
297 unsigned long flags;
298 snd_pcm_uframes_t hwptr_done;
299 struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
300
301 spin_lock_irqsave(&itvsc->slock, flags);
302 hwptr_done = itvsc->hwptr_done_capture;
303 spin_unlock_irqrestore(&itvsc->slock, flags);
304
305 return hwptr_done;
306}
307
308static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
309 unsigned long offset)
310{
311 void *pageptr = subs->runtime->dma_area + offset;
312
313 return vmalloc_to_page(pageptr);
314}
315
316static const struct snd_pcm_ops snd_ivtv_pcm_capture_ops = {
317 .open = snd_ivtv_pcm_capture_open,
318 .close = snd_ivtv_pcm_capture_close,
319 .ioctl = snd_ivtv_pcm_ioctl,
320 .hw_params = snd_ivtv_pcm_hw_params,
321 .hw_free = snd_ivtv_pcm_hw_free,
322 .prepare = snd_ivtv_pcm_prepare,
323 .trigger = snd_ivtv_pcm_trigger,
324 .pointer = snd_ivtv_pcm_pointer,
325 .page = snd_pcm_get_vmalloc_page,
326};
327
328int snd_ivtv_pcm_create(struct snd_ivtv_card *itvsc)
329{
330 struct snd_pcm *sp;
331 struct snd_card *sc = itvsc->sc;
332 struct v4l2_device *v4l2_dev = itvsc->v4l2_dev;
333 struct ivtv *itv = to_ivtv(v4l2_dev);
334 int ret;
335
336 ret = snd_pcm_new(sc, "CX2341[56] PCM",
337 0,
338 0,
339 1,
340 &sp);
341 if (ret) {
342 IVTV_ALSA_ERR("%s: snd_ivtv_pcm_create() failed with err %d\n",
343 __func__, ret);
344 goto err_exit;
345 }
346
347 spin_lock_init(&itvsc->slock);
348
349 snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_CAPTURE,
350 &snd_ivtv_pcm_capture_ops);
351 sp->info_flags = 0;
352 sp->private_data = itvsc;
353 strscpy(sp->name, itv->card_name, sizeof(sp->name));
354
355 return 0;
356
357err_exit:
358 return ret;
359}
360
