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f9b071c7 AW |
1 | /* |
2 | * ALSA PCM device for the | |
3 | * ALSA interface to cx18 PCM capture streams | |
4 | * | |
6afdeaf8 | 5 | * Copyright (C) 2009 Andy Walls <awalls@md.metrocast.net> |
9972de90 DH |
6 | * Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com> |
7 | * | |
8 | * Portions of this work were sponsored by ONELAN Limited. | |
f9b071c7 AW |
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> | |
6aeb0905 | 28 | #include <linux/vmalloc.h> |
f9b071c7 AW |
29 | |
30 | #include <media/v4l2-device.h> | |
31 | ||
32 | #include <sound/core.h> | |
33 | #include <sound/pcm.h> | |
34 | ||
35 | #include "cx18-driver.h" | |
9972de90 DH |
36 | #include "cx18-queue.h" |
37 | #include "cx18-streams.h" | |
38 | #include "cx18-fileops.h" | |
f9b071c7 AW |
39 | #include "cx18-alsa.h" |
40 | ||
71036ef2 DH |
41 | static unsigned int pcm_debug; |
42 | module_param(pcm_debug, int, 0644); | |
43 | MODULE_PARM_DESC(pcm_debug, "enable debug messages for pcm"); | |
9972de90 DH |
44 | |
45 | #define dprintk(fmt, arg...) do { \ | |
71036ef2 DH |
46 | if (pcm_debug) \ |
47 | printk(KERN_INFO "cx18-alsa-pcm %s: " fmt, \ | |
9972de90 DH |
48 | __func__, ##arg); \ |
49 | } while (0) | |
50 | ||
9972de90 DH |
51 | static struct snd_pcm_hardware snd_cx18_hw_capture = { |
52 | .info = SNDRV_PCM_INFO_BLOCK_TRANSFER | | |
53 | SNDRV_PCM_INFO_MMAP | | |
54 | SNDRV_PCM_INFO_INTERLEAVED | | |
55 | SNDRV_PCM_INFO_MMAP_VALID, | |
56 | ||
57 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
58 | ||
94b12d9e | 59 | .rates = SNDRV_PCM_RATE_48000, |
9972de90 DH |
60 | |
61 | .rate_min = 48000, | |
62 | .rate_max = 48000, | |
63 | .channels_min = 2, | |
64 | .channels_max = 2, | |
65 | .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */ | |
66 | .period_bytes_min = 64, /* 12544/2, */ | |
67 | .period_bytes_max = 12544, | |
68 | .periods_min = 2, | |
69 | .periods_max = 98, /* 12544, */ | |
70 | }; | |
71 | ||
60433e2a DH |
72 | void cx18_alsa_announce_pcm_data(struct snd_cx18_card *cxsc, u8 *pcm_data, |
73 | size_t num_bytes) | |
74 | { | |
75 | struct snd_pcm_substream *substream; | |
76 | struct snd_pcm_runtime *runtime; | |
77 | unsigned int oldptr; | |
78 | unsigned int stride; | |
79 | int period_elapsed = 0; | |
80 | int length; | |
81 | ||
c2312f60 | 82 | dprintk("cx18 alsa announce ptr=%p data=%p num_bytes=%zd\n", cxsc, |
60433e2a DH |
83 | pcm_data, num_bytes); |
84 | ||
85 | substream = cxsc->capture_pcm_substream; | |
86 | if (substream == NULL) { | |
87 | dprintk("substream was NULL\n"); | |
88 | return; | |
89 | } | |
90 | ||
91 | runtime = substream->runtime; | |
92 | if (runtime == NULL) { | |
93 | dprintk("runtime was NULL\n"); | |
94 | return; | |
95 | } | |
96 | ||
97 | stride = runtime->frame_bits >> 3; | |
98 | if (stride == 0) { | |
99 | dprintk("stride is zero\n"); | |
100 | return; | |
101 | } | |
102 | ||
103 | length = num_bytes / stride; | |
104 | if (length == 0) { | |
105 | dprintk("%s: length was zero\n", __func__); | |
106 | return; | |
107 | } | |
108 | ||
109 | if (runtime->dma_area == NULL) { | |
110 | dprintk("dma area was NULL - ignoring\n"); | |
111 | return; | |
112 | } | |
113 | ||
114 | oldptr = cxsc->hwptr_done_capture; | |
115 | if (oldptr + length >= runtime->buffer_size) { | |
116 | unsigned int cnt = | |
117 | runtime->buffer_size - oldptr; | |
118 | memcpy(runtime->dma_area + oldptr * stride, pcm_data, | |
119 | cnt * stride); | |
120 | memcpy(runtime->dma_area, pcm_data + cnt * stride, | |
121 | length * stride - cnt * stride); | |
122 | } else { | |
123 | memcpy(runtime->dma_area + oldptr * stride, pcm_data, | |
124 | length * stride); | |
125 | } | |
126 | snd_pcm_stream_lock(substream); | |
127 | ||
128 | cxsc->hwptr_done_capture += length; | |
129 | if (cxsc->hwptr_done_capture >= | |
130 | runtime->buffer_size) | |
131 | cxsc->hwptr_done_capture -= | |
132 | runtime->buffer_size; | |
133 | ||
134 | cxsc->capture_transfer_done += length; | |
135 | if (cxsc->capture_transfer_done >= | |
136 | runtime->period_size) { | |
137 | cxsc->capture_transfer_done -= | |
138 | runtime->period_size; | |
139 | period_elapsed = 1; | |
140 | } | |
141 | ||
142 | snd_pcm_stream_unlock(substream); | |
143 | ||
144 | if (period_elapsed) | |
145 | snd_pcm_period_elapsed(substream); | |
146 | } | |
147 | ||
f9b071c7 AW |
148 | static int snd_cx18_pcm_capture_open(struct snd_pcm_substream *substream) |
149 | { | |
150 | struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream); | |
151 | struct snd_pcm_runtime *runtime = substream->runtime; | |
152 | struct v4l2_device *v4l2_dev = cxsc->v4l2_dev; | |
f9b071c7 | 153 | struct cx18 *cx = to_cx18(v4l2_dev); |
9972de90 | 154 | struct cx18_stream *s; |
831f476c | 155 | struct cx18_open_id item; |
9972de90 DH |
156 | int ret; |
157 | ||
158 | /* Instruct the cx18 to start sending packets */ | |
b4729dcb | 159 | snd_cx18_lock(cxsc); |
9972de90 DH |
160 | s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM]; |
161 | ||
831f476c AW |
162 | item.cx = cx; |
163 | item.type = s->type; | |
164 | item.open_id = cx->open_id++; | |
9972de90 DH |
165 | |
166 | /* See if the stream is available */ | |
831f476c | 167 | if (cx18_claim_stream(&item, item.type)) { |
9972de90 | 168 | /* No, it's already in use */ |
b4729dcb | 169 | snd_cx18_unlock(cxsc); |
9972de90 DH |
170 | return -EBUSY; |
171 | } | |
172 | ||
173 | if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) || | |
174 | test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) { | |
175 | /* We're already streaming. No additional action required */ | |
b4729dcb | 176 | snd_cx18_unlock(cxsc); |
9972de90 DH |
177 | return 0; |
178 | } | |
179 | ||
180 | ||
181 | runtime->hw = snd_cx18_hw_capture; | |
182 | snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); | |
183 | cxsc->capture_pcm_substream = substream; | |
184 | runtime->private_data = cx; | |
185 | ||
186 | cx->pcm_announce_callback = cx18_alsa_announce_pcm_data; | |
187 | ||
188 | /* Not currently streaming, so start it up */ | |
189 | set_bit(CX18_F_S_STREAMING, &s->s_flags); | |
190 | ret = cx18_start_v4l2_encode_stream(s); | |
b4729dcb | 191 | snd_cx18_unlock(cxsc); |
9972de90 | 192 | |
f9b071c7 AW |
193 | return 0; |
194 | } | |
195 | ||
196 | static int snd_cx18_pcm_capture_close(struct snd_pcm_substream *substream) | |
197 | { | |
9972de90 DH |
198 | struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream); |
199 | struct v4l2_device *v4l2_dev = cxsc->v4l2_dev; | |
200 | struct cx18 *cx = to_cx18(v4l2_dev); | |
201 | struct cx18_stream *s; | |
202 | int ret; | |
203 | ||
204 | /* Instruct the cx18 to stop sending packets */ | |
b4729dcb | 205 | snd_cx18_lock(cxsc); |
9972de90 DH |
206 | s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM]; |
207 | ret = cx18_stop_v4l2_encode_stream(s, 0); | |
208 | clear_bit(CX18_F_S_STREAMING, &s->s_flags); | |
209 | ||
210 | cx18_release_stream(s); | |
211 | ||
212 | cx->pcm_announce_callback = NULL; | |
b4729dcb | 213 | snd_cx18_unlock(cxsc); |
9972de90 | 214 | |
f9b071c7 AW |
215 | return 0; |
216 | } | |
217 | ||
218 | static int snd_cx18_pcm_ioctl(struct snd_pcm_substream *substream, | |
219 | unsigned int cmd, void *arg) | |
220 | { | |
78b055be HV |
221 | struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream); |
222 | int ret; | |
223 | ||
224 | snd_cx18_lock(cxsc); | |
225 | ret = snd_pcm_lib_ioctl(substream, cmd, arg); | |
226 | snd_cx18_unlock(cxsc); | |
227 | return ret; | |
f9b071c7 AW |
228 | } |
229 | ||
9972de90 DH |
230 | |
231 | static 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 | ||
f9b071c7 AW |
252 | static int snd_cx18_pcm_hw_params(struct snd_pcm_substream *substream, |
253 | struct snd_pcm_hw_params *params) | |
254 | { | |
9972de90 DH |
255 | int ret; |
256 | ||
257 | dprintk("%s called\n", __func__); | |
258 | ||
259 | ret = snd_pcm_alloc_vmalloc_buffer(substream, | |
260 | params_buffer_bytes(params)); | |
f9b071c7 AW |
261 | return 0; |
262 | } | |
263 | ||
264 | static int snd_cx18_pcm_hw_free(struct snd_pcm_substream *substream) | |
265 | { | |
94b12d9e DH |
266 | struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream); |
267 | unsigned long flags; | |
268 | ||
269 | spin_lock_irqsave(&cxsc->slock, flags); | |
270 | if (substream->runtime->dma_area) { | |
271 | dprintk("freeing pcm capture region\n"); | |
272 | vfree(substream->runtime->dma_area); | |
273 | substream->runtime->dma_area = NULL; | |
274 | } | |
275 | spin_unlock_irqrestore(&cxsc->slock, flags); | |
276 | ||
f9b071c7 AW |
277 | return 0; |
278 | } | |
279 | ||
280 | static int snd_cx18_pcm_prepare(struct snd_pcm_substream *substream) | |
281 | { | |
9972de90 DH |
282 | struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream); |
283 | ||
284 | cxsc->hwptr_done_capture = 0; | |
285 | cxsc->capture_transfer_done = 0; | |
286 | ||
f9b071c7 AW |
287 | return 0; |
288 | } | |
289 | ||
290 | static int snd_cx18_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
291 | { | |
292 | return 0; | |
293 | } | |
294 | ||
295 | static | |
296 | snd_pcm_uframes_t snd_cx18_pcm_pointer(struct snd_pcm_substream *substream) | |
297 | { | |
9972de90 DH |
298 | unsigned long flags; |
299 | snd_pcm_uframes_t hwptr_done; | |
300 | struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream); | |
301 | ||
302 | spin_lock_irqsave(&cxsc->slock, flags); | |
303 | hwptr_done = cxsc->hwptr_done_capture; | |
304 | spin_unlock_irqrestore(&cxsc->slock, flags); | |
305 | ||
306 | return hwptr_done; | |
307 | } | |
308 | ||
9972de90 DH |
309 | static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs, |
310 | unsigned long offset) | |
311 | { | |
312 | void *pageptr = subs->runtime->dma_area + offset; | |
313 | ||
314 | return vmalloc_to_page(pageptr); | |
f9b071c7 AW |
315 | } |
316 | ||
317 | static struct snd_pcm_ops snd_cx18_pcm_capture_ops = { | |
318 | .open = snd_cx18_pcm_capture_open, | |
319 | .close = snd_cx18_pcm_capture_close, | |
320 | .ioctl = snd_cx18_pcm_ioctl, | |
321 | .hw_params = snd_cx18_pcm_hw_params, | |
322 | .hw_free = snd_cx18_pcm_hw_free, | |
323 | .prepare = snd_cx18_pcm_prepare, | |
324 | .trigger = snd_cx18_pcm_trigger, | |
325 | .pointer = snd_cx18_pcm_pointer, | |
9972de90 | 326 | .page = snd_pcm_get_vmalloc_page, |
f9b071c7 AW |
327 | }; |
328 | ||
9972de90 | 329 | int snd_cx18_pcm_create(struct snd_cx18_card *cxsc) |
f9b071c7 AW |
330 | { |
331 | struct snd_pcm *sp; | |
332 | struct snd_card *sc = cxsc->sc; | |
333 | struct v4l2_device *v4l2_dev = cxsc->v4l2_dev; | |
334 | struct cx18 *cx = to_cx18(v4l2_dev); | |
335 | int ret; | |
336 | ||
337 | ret = snd_pcm_new(sc, "CX23418 PCM", | |
338 | 0, /* PCM device 0, the only one for this card */ | |
339 | 0, /* 0 playback substreams */ | |
340 | 1, /* 1 capture substream */ | |
341 | &sp); | |
342 | if (ret) { | |
343 | CX18_ALSA_ERR("%s: snd_cx18_pcm_create() failed with err %d\n", | |
344 | __func__, ret); | |
345 | goto err_exit; | |
346 | } | |
9972de90 DH |
347 | |
348 | spin_lock_init(&cxsc->slock); | |
349 | ||
780edb7a DH |
350 | snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_CAPTURE, |
351 | &snd_cx18_pcm_capture_ops); | |
9972de90 DH |
352 | sp->info_flags = 0; |
353 | sp->private_data = cxsc; | |
5eb9978f | 354 | strlcpy(sp->name, cx->card_name, sizeof(sp->name)); |
9972de90 | 355 | |
f9b071c7 AW |
356 | return 0; |
357 | ||
358 | err_exit: | |
359 | return ret; | |
360 | } |