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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. | |
f9b071c7 AW |
19 | */ |
20 | ||
21 | #include <linux/init.h> | |
22 | #include <linux/kernel.h> | |
6aeb0905 | 23 | #include <linux/vmalloc.h> |
f9b071c7 AW |
24 | |
25 | #include <media/v4l2-device.h> | |
26 | ||
27 | #include <sound/core.h> | |
28 | #include <sound/pcm.h> | |
29 | ||
30 | #include "cx18-driver.h" | |
9972de90 DH |
31 | #include "cx18-queue.h" |
32 | #include "cx18-streams.h" | |
33 | #include "cx18-fileops.h" | |
f9b071c7 | 34 | #include "cx18-alsa.h" |
5e6e81b2 | 35 | #include "cx18-alsa-pcm.h" |
f9b071c7 | 36 | |
71036ef2 DH |
37 | static unsigned int pcm_debug; |
38 | module_param(pcm_debug, int, 0644); | |
39 | MODULE_PARM_DESC(pcm_debug, "enable debug messages for pcm"); | |
9972de90 DH |
40 | |
41 | #define dprintk(fmt, arg...) do { \ | |
71036ef2 DH |
42 | if (pcm_debug) \ |
43 | printk(KERN_INFO "cx18-alsa-pcm %s: " fmt, \ | |
9972de90 DH |
44 | __func__, ##arg); \ |
45 | } while (0) | |
46 | ||
9972de90 DH |
47 | static struct snd_pcm_hardware snd_cx18_hw_capture = { |
48 | .info = SNDRV_PCM_INFO_BLOCK_TRANSFER | | |
49 | SNDRV_PCM_INFO_MMAP | | |
50 | SNDRV_PCM_INFO_INTERLEAVED | | |
51 | SNDRV_PCM_INFO_MMAP_VALID, | |
52 | ||
53 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
54 | ||
94b12d9e | 55 | .rates = SNDRV_PCM_RATE_48000, |
9972de90 DH |
56 | |
57 | .rate_min = 48000, | |
58 | .rate_max = 48000, | |
59 | .channels_min = 2, | |
60 | .channels_max = 2, | |
61 | .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */ | |
62 | .period_bytes_min = 64, /* 12544/2, */ | |
63 | .period_bytes_max = 12544, | |
64 | .periods_min = 2, | |
65 | .periods_max = 98, /* 12544, */ | |
66 | }; | |
67 | ||
60433e2a DH |
68 | void cx18_alsa_announce_pcm_data(struct snd_cx18_card *cxsc, u8 *pcm_data, |
69 | size_t num_bytes) | |
70 | { | |
71 | struct snd_pcm_substream *substream; | |
72 | struct snd_pcm_runtime *runtime; | |
73 | unsigned int oldptr; | |
74 | unsigned int stride; | |
75 | int period_elapsed = 0; | |
76 | int length; | |
77 | ||
339f06c5 | 78 | dprintk("cx18 alsa announce ptr=%p data=%p num_bytes=%zu\n", cxsc, |
60433e2a DH |
79 | pcm_data, num_bytes); |
80 | ||
81 | substream = cxsc->capture_pcm_substream; | |
82 | if (substream == NULL) { | |
83 | dprintk("substream was NULL\n"); | |
84 | return; | |
85 | } | |
86 | ||
87 | runtime = substream->runtime; | |
88 | if (runtime == NULL) { | |
89 | dprintk("runtime was NULL\n"); | |
90 | return; | |
91 | } | |
92 | ||
93 | stride = runtime->frame_bits >> 3; | |
94 | if (stride == 0) { | |
95 | dprintk("stride is zero\n"); | |
96 | return; | |
97 | } | |
98 | ||
99 | length = num_bytes / stride; | |
100 | if (length == 0) { | |
101 | dprintk("%s: length was zero\n", __func__); | |
102 | return; | |
103 | } | |
104 | ||
105 | if (runtime->dma_area == NULL) { | |
106 | dprintk("dma area was NULL - ignoring\n"); | |
107 | return; | |
108 | } | |
109 | ||
110 | oldptr = cxsc->hwptr_done_capture; | |
111 | if (oldptr + length >= runtime->buffer_size) { | |
112 | unsigned int cnt = | |
113 | runtime->buffer_size - oldptr; | |
114 | memcpy(runtime->dma_area + oldptr * stride, pcm_data, | |
115 | cnt * stride); | |
116 | memcpy(runtime->dma_area, pcm_data + cnt * stride, | |
117 | length * stride - cnt * stride); | |
118 | } else { | |
119 | memcpy(runtime->dma_area + oldptr * stride, pcm_data, | |
120 | length * stride); | |
121 | } | |
122 | snd_pcm_stream_lock(substream); | |
123 | ||
124 | cxsc->hwptr_done_capture += length; | |
125 | if (cxsc->hwptr_done_capture >= | |
126 | runtime->buffer_size) | |
127 | cxsc->hwptr_done_capture -= | |
128 | runtime->buffer_size; | |
129 | ||
130 | cxsc->capture_transfer_done += length; | |
131 | if (cxsc->capture_transfer_done >= | |
132 | runtime->period_size) { | |
133 | cxsc->capture_transfer_done -= | |
134 | runtime->period_size; | |
135 | period_elapsed = 1; | |
136 | } | |
137 | ||
138 | snd_pcm_stream_unlock(substream); | |
139 | ||
140 | if (period_elapsed) | |
141 | snd_pcm_period_elapsed(substream); | |
142 | } | |
143 | ||
f9b071c7 AW |
144 | static int snd_cx18_pcm_capture_open(struct snd_pcm_substream *substream) |
145 | { | |
146 | struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream); | |
147 | struct snd_pcm_runtime *runtime = substream->runtime; | |
148 | struct v4l2_device *v4l2_dev = cxsc->v4l2_dev; | |
f9b071c7 | 149 | struct cx18 *cx = to_cx18(v4l2_dev); |
9972de90 | 150 | struct cx18_stream *s; |
831f476c | 151 | struct cx18_open_id item; |
9972de90 DH |
152 | int ret; |
153 | ||
154 | /* Instruct the cx18 to start sending packets */ | |
b4729dcb | 155 | snd_cx18_lock(cxsc); |
9972de90 DH |
156 | s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM]; |
157 | ||
831f476c AW |
158 | item.cx = cx; |
159 | item.type = s->type; | |
160 | item.open_id = cx->open_id++; | |
9972de90 DH |
161 | |
162 | /* See if the stream is available */ | |
831f476c | 163 | if (cx18_claim_stream(&item, item.type)) { |
9972de90 | 164 | /* No, it's already in use */ |
b4729dcb | 165 | snd_cx18_unlock(cxsc); |
9972de90 DH |
166 | return -EBUSY; |
167 | } | |
168 | ||
169 | if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) || | |
170 | test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) { | |
171 | /* We're already streaming. No additional action required */ | |
b4729dcb | 172 | snd_cx18_unlock(cxsc); |
9972de90 DH |
173 | return 0; |
174 | } | |
175 | ||
176 | ||
177 | runtime->hw = snd_cx18_hw_capture; | |
178 | snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); | |
179 | cxsc->capture_pcm_substream = substream; | |
180 | runtime->private_data = cx; | |
181 | ||
182 | cx->pcm_announce_callback = cx18_alsa_announce_pcm_data; | |
183 | ||
184 | /* Not currently streaming, so start it up */ | |
185 | set_bit(CX18_F_S_STREAMING, &s->s_flags); | |
186 | ret = cx18_start_v4l2_encode_stream(s); | |
b4729dcb | 187 | snd_cx18_unlock(cxsc); |
9972de90 | 188 | |
932205a7 | 189 | return ret; |
f9b071c7 AW |
190 | } |
191 | ||
192 | static int snd_cx18_pcm_capture_close(struct snd_pcm_substream *substream) | |
193 | { | |
9972de90 DH |
194 | struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream); |
195 | struct v4l2_device *v4l2_dev = cxsc->v4l2_dev; | |
196 | struct cx18 *cx = to_cx18(v4l2_dev); | |
197 | struct cx18_stream *s; | |
9972de90 DH |
198 | |
199 | /* Instruct the cx18 to stop sending packets */ | |
b4729dcb | 200 | snd_cx18_lock(cxsc); |
9972de90 | 201 | s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM]; |
932205a7 | 202 | cx18_stop_v4l2_encode_stream(s, 0); |
9972de90 DH |
203 | clear_bit(CX18_F_S_STREAMING, &s->s_flags); |
204 | ||
205 | cx18_release_stream(s); | |
206 | ||
207 | cx->pcm_announce_callback = NULL; | |
b4729dcb | 208 | snd_cx18_unlock(cxsc); |
9972de90 | 209 | |
f9b071c7 AW |
210 | return 0; |
211 | } | |
212 | ||
213 | static int snd_cx18_pcm_ioctl(struct snd_pcm_substream *substream, | |
214 | unsigned int cmd, void *arg) | |
215 | { | |
78b055be HV |
216 | struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream); |
217 | int ret; | |
218 | ||
219 | snd_cx18_lock(cxsc); | |
220 | ret = snd_pcm_lib_ioctl(substream, cmd, arg); | |
221 | snd_cx18_unlock(cxsc); | |
222 | return ret; | |
f9b071c7 AW |
223 | } |
224 | ||
9972de90 DH |
225 | |
226 | static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, | |
227 | size_t size) | |
228 | { | |
229 | struct snd_pcm_runtime *runtime = subs->runtime; | |
230 | ||
231 | dprintk("Allocating vbuffer\n"); | |
232 | if (runtime->dma_area) { | |
233 | if (runtime->dma_bytes > size) | |
234 | return 0; | |
235 | ||
236 | vfree(runtime->dma_area); | |
237 | } | |
238 | runtime->dma_area = vmalloc(size); | |
239 | if (!runtime->dma_area) | |
240 | return -ENOMEM; | |
241 | ||
242 | runtime->dma_bytes = size; | |
243 | ||
244 | return 0; | |
245 | } | |
246 | ||
f9b071c7 AW |
247 | static int snd_cx18_pcm_hw_params(struct snd_pcm_substream *substream, |
248 | struct snd_pcm_hw_params *params) | |
249 | { | |
9972de90 DH |
250 | dprintk("%s called\n", __func__); |
251 | ||
932205a7 | 252 | return snd_pcm_alloc_vmalloc_buffer(substream, |
9972de90 | 253 | params_buffer_bytes(params)); |
f9b071c7 AW |
254 | } |
255 | ||
256 | static int snd_cx18_pcm_hw_free(struct snd_pcm_substream *substream) | |
257 | { | |
94b12d9e DH |
258 | struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream); |
259 | unsigned long flags; | |
260 | ||
261 | spin_lock_irqsave(&cxsc->slock, flags); | |
262 | if (substream->runtime->dma_area) { | |
263 | dprintk("freeing pcm capture region\n"); | |
264 | vfree(substream->runtime->dma_area); | |
265 | substream->runtime->dma_area = NULL; | |
266 | } | |
267 | spin_unlock_irqrestore(&cxsc->slock, flags); | |
268 | ||
f9b071c7 AW |
269 | return 0; |
270 | } | |
271 | ||
272 | static int snd_cx18_pcm_prepare(struct snd_pcm_substream *substream) | |
273 | { | |
9972de90 DH |
274 | struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream); |
275 | ||
276 | cxsc->hwptr_done_capture = 0; | |
277 | cxsc->capture_transfer_done = 0; | |
278 | ||
f9b071c7 AW |
279 | return 0; |
280 | } | |
281 | ||
282 | static int snd_cx18_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
283 | { | |
284 | return 0; | |
285 | } | |
286 | ||
287 | static | |
288 | snd_pcm_uframes_t snd_cx18_pcm_pointer(struct snd_pcm_substream *substream) | |
289 | { | |
9972de90 DH |
290 | unsigned long flags; |
291 | snd_pcm_uframes_t hwptr_done; | |
292 | struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream); | |
293 | ||
294 | spin_lock_irqsave(&cxsc->slock, flags); | |
295 | hwptr_done = cxsc->hwptr_done_capture; | |
296 | spin_unlock_irqrestore(&cxsc->slock, flags); | |
297 | ||
298 | return hwptr_done; | |
299 | } | |
300 | ||
9972de90 DH |
301 | static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs, |
302 | unsigned long offset) | |
303 | { | |
304 | void *pageptr = subs->runtime->dma_area + offset; | |
305 | ||
306 | return vmalloc_to_page(pageptr); | |
f9b071c7 AW |
307 | } |
308 | ||
5c8d8c01 | 309 | static const struct snd_pcm_ops snd_cx18_pcm_capture_ops = { |
f9b071c7 AW |
310 | .open = snd_cx18_pcm_capture_open, |
311 | .close = snd_cx18_pcm_capture_close, | |
312 | .ioctl = snd_cx18_pcm_ioctl, | |
313 | .hw_params = snd_cx18_pcm_hw_params, | |
314 | .hw_free = snd_cx18_pcm_hw_free, | |
315 | .prepare = snd_cx18_pcm_prepare, | |
316 | .trigger = snd_cx18_pcm_trigger, | |
317 | .pointer = snd_cx18_pcm_pointer, | |
9972de90 | 318 | .page = snd_pcm_get_vmalloc_page, |
f9b071c7 AW |
319 | }; |
320 | ||
9972de90 | 321 | int snd_cx18_pcm_create(struct snd_cx18_card *cxsc) |
f9b071c7 AW |
322 | { |
323 | struct snd_pcm *sp; | |
324 | struct snd_card *sc = cxsc->sc; | |
325 | struct v4l2_device *v4l2_dev = cxsc->v4l2_dev; | |
326 | struct cx18 *cx = to_cx18(v4l2_dev); | |
327 | int ret; | |
328 | ||
329 | ret = snd_pcm_new(sc, "CX23418 PCM", | |
330 | 0, /* PCM device 0, the only one for this card */ | |
331 | 0, /* 0 playback substreams */ | |
332 | 1, /* 1 capture substream */ | |
333 | &sp); | |
334 | if (ret) { | |
335 | CX18_ALSA_ERR("%s: snd_cx18_pcm_create() failed with err %d\n", | |
336 | __func__, ret); | |
337 | goto err_exit; | |
338 | } | |
9972de90 DH |
339 | |
340 | spin_lock_init(&cxsc->slock); | |
341 | ||
780edb7a DH |
342 | snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_CAPTURE, |
343 | &snd_cx18_pcm_capture_ops); | |
9972de90 DH |
344 | sp->info_flags = 0; |
345 | sp->private_data = cxsc; | |
5eb9978f | 346 | strlcpy(sp->name, cx->card_name, sizeof(sp->name)); |
9972de90 | 347 | |
f9b071c7 AW |
348 | return 0; |
349 | ||
350 | err_exit: | |
351 | return ret; | |
352 | } |