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ASoC: Prevent pop_wait overwrite
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1 /*
2  * soc-compress.c  --  ALSA SoC Compress
3  *
4  * Copyright (C) 2012 Intel Corp.
5  *
6  * Authors: Namarta Kohli <namartax.kohli@intel.com>
7  *          Ramesh Babu K V <ramesh.babu@linux.intel.com>
8  *          Vinod Koul <vinod.koul@linux.intel.com>
9  *
10  *  This program is free software; you can redistribute  it and/or modify it
11  *  under  the terms of  the GNU General  Public License as published by the
12  *  Free Software Foundation;  either version 2 of the  License, or (at your
13  *  option) any later version.
14  *
15  */
16
17 #include <linux/kernel.h>
18 #include <linux/init.h>
19 #include <linux/delay.h>
20 #include <linux/slab.h>
21 #include <linux/workqueue.h>
22 #include <sound/core.h>
23 #include <sound/compress_params.h>
24 #include <sound/compress_driver.h>
25 #include <sound/soc.h>
26 #include <sound/initval.h>
27
28 static int soc_compr_open(struct snd_compr_stream *cstream)
29 {
30         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
31         struct snd_soc_platform *platform = rtd->platform;
32         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
33         struct snd_soc_dai *codec_dai = rtd->codec_dai;
34         int ret = 0;
35
36         if (platform->driver->compr_ops && platform->driver->compr_ops->open) {
37                 ret = platform->driver->compr_ops->open(cstream);
38                 if (ret < 0) {
39                         pr_err("compress asoc: can't open platform %s\n", platform->name);
40                         goto out;
41                 }
42         }
43
44         if (rtd->dai_link->compr_ops && rtd->dai_link->compr_ops->startup) {
45                 ret = rtd->dai_link->compr_ops->startup(cstream);
46                 if (ret < 0) {
47                         pr_err("compress asoc: %s startup failed\n", rtd->dai_link->name);
48                         goto machine_err;
49                 }
50         }
51
52         if (cstream->direction == SND_COMPRESS_PLAYBACK) {
53                 cpu_dai->playback_active++;
54                 codec_dai->playback_active++;
55         } else {
56                 cpu_dai->capture_active++;
57                 codec_dai->capture_active++;
58         }
59
60         cpu_dai->active++;
61         codec_dai->active++;
62         rtd->codec->active++;
63
64         return 0;
65
66 machine_err:
67         if (platform->driver->compr_ops && platform->driver->compr_ops->free)
68                 platform->driver->compr_ops->free(cstream);
69 out:
70         return ret;
71 }
72
73 static int soc_compr_free(struct snd_compr_stream *cstream)
74 {
75         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
76         struct snd_soc_platform *platform = rtd->platform;
77         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
78         struct snd_soc_dai *codec_dai = rtd->codec_dai;
79         struct snd_soc_codec *codec = rtd->codec;
80
81         if (cstream->direction == SND_COMPRESS_PLAYBACK) {
82                 cpu_dai->playback_active--;
83                 codec_dai->playback_active--;
84         } else {
85                 cpu_dai->capture_active--;
86                 codec_dai->capture_active--;
87         }
88
89         snd_soc_dai_digital_mute(codec_dai, 1);
90
91         cpu_dai->active--;
92         codec_dai->active--;
93         codec->active--;
94
95         if (!cpu_dai->active)
96                 cpu_dai->rate = 0;
97
98         if (!codec_dai->active)
99                 codec_dai->rate = 0;
100
101
102         if (rtd->dai_link->compr_ops && rtd->dai_link->compr_ops->shutdown)
103                 rtd->dai_link->compr_ops->shutdown(cstream);
104
105         if (platform->driver->compr_ops && platform->driver->compr_ops->free)
106                 platform->driver->compr_ops->free(cstream);
107         cpu_dai->runtime = NULL;
108
109         if (cstream->direction == SND_COMPRESS_PLAYBACK) {
110                 if (!rtd->pmdown_time || codec->ignore_pmdown_time ||
111                     rtd->dai_link->ignore_pmdown_time) {
112                         snd_soc_dapm_stream_event(rtd,
113                                         SNDRV_PCM_STREAM_PLAYBACK,
114                                         SND_SOC_DAPM_STREAM_STOP);
115                 } else
116                         rtd->pop_wait = 1;
117                         schedule_delayed_work(&rtd->delayed_work,
118                                 msecs_to_jiffies(rtd->pmdown_time));
119         } else {
120                 /* capture streams can be powered down now */
121                 snd_soc_dapm_stream_event(rtd,
122                         SNDRV_PCM_STREAM_CAPTURE,
123                         SND_SOC_DAPM_STREAM_STOP);
124         }
125
126         return 0;
127 }
128
129 static int soc_compr_trigger(struct snd_compr_stream *cstream, int cmd)
130 {
131
132         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
133         struct snd_soc_platform *platform = rtd->platform;
134         struct snd_soc_dai *codec_dai = rtd->codec_dai;
135         int ret = 0;
136
137         if (platform->driver->compr_ops && platform->driver->compr_ops->trigger) {
138                 ret = platform->driver->compr_ops->trigger(cstream, cmd);
139                 if (ret < 0)
140                         return ret;
141         }
142
143         if (cmd == SNDRV_PCM_TRIGGER_START)
144                 snd_soc_dai_digital_mute(codec_dai, 0);
145         else if (cmd == SNDRV_PCM_TRIGGER_STOP)
146                 snd_soc_dai_digital_mute(codec_dai, 1);
147
148         return ret;
149 }
150
151 static int soc_compr_set_params(struct snd_compr_stream *cstream,
152                                         struct snd_compr_params *params)
153 {
154         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
155         struct snd_soc_platform *platform = rtd->platform;
156         int ret = 0;
157
158         /* first we call set_params for the platform driver
159          * this should configure the soc side
160          * if the machine has compressed ops then we call that as well
161          * expectation is that platform and machine will configure everything
162          * for this compress path, like configuring pcm port for codec
163          */
164         if (platform->driver->compr_ops && platform->driver->compr_ops->set_params) {
165                 ret = platform->driver->compr_ops->set_params(cstream, params);
166                 if (ret < 0)
167                         return ret;
168         }
169
170         if (rtd->dai_link->compr_ops && rtd->dai_link->compr_ops->set_params) {
171                 ret = rtd->dai_link->compr_ops->set_params(cstream);
172                 if (ret < 0)
173                         return ret;
174         }
175
176         snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
177                                 SND_SOC_DAPM_STREAM_START);
178
179         return ret;
180 }
181
182 static int soc_compr_get_params(struct snd_compr_stream *cstream,
183                                         struct snd_codec *params)
184 {
185         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
186         struct snd_soc_platform *platform = rtd->platform;
187         int ret = 0;
188
189         if (platform->driver->compr_ops && platform->driver->compr_ops->get_params)
190                 ret = platform->driver->compr_ops->get_params(cstream, params);
191
192         return ret;
193 }
194
195 static int soc_compr_get_caps(struct snd_compr_stream *cstream,
196                                 struct snd_compr_caps *caps)
197 {
198         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
199         struct snd_soc_platform *platform = rtd->platform;
200         int ret = 0;
201
202         if (platform->driver->compr_ops && platform->driver->compr_ops->get_caps)
203                 ret = platform->driver->compr_ops->get_caps(cstream, caps);
204
205         return ret;
206 }
207
208 static int soc_compr_get_codec_caps(struct snd_compr_stream *cstream,
209                                 struct snd_compr_codec_caps *codec)
210 {
211         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
212         struct snd_soc_platform *platform = rtd->platform;
213         int ret = 0;
214
215         if (platform->driver->compr_ops && platform->driver->compr_ops->get_codec_caps)
216                 ret = platform->driver->compr_ops->get_codec_caps(cstream, codec);
217
218         return ret;
219 }
220
221 static int soc_compr_ack(struct snd_compr_stream *cstream, size_t bytes)
222 {
223         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
224         struct snd_soc_platform *platform = rtd->platform;
225         int ret = 0;
226
227         if (platform->driver->compr_ops && platform->driver->compr_ops->ack)
228                 ret = platform->driver->compr_ops->ack(cstream, bytes);
229
230         return ret;
231 }
232
233 static int soc_compr_pointer(struct snd_compr_stream *cstream,
234                         struct snd_compr_tstamp *tstamp)
235 {
236         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
237         struct snd_soc_platform *platform = rtd->platform;
238
239         if (platform->driver->compr_ops && platform->driver->compr_ops->pointer)
240                  platform->driver->compr_ops->pointer(cstream, tstamp);
241
242         return 0;
243 }
244
245 /* ASoC Compress operations */
246 static struct snd_compr_ops soc_compr_ops = {
247         .open           = soc_compr_open,
248         .free           = soc_compr_free,
249         .set_params     = soc_compr_set_params,
250         .get_params     = soc_compr_get_params,
251         .trigger        = soc_compr_trigger,
252         .pointer        = soc_compr_pointer,
253         .ack            = soc_compr_ack,
254         .get_caps       = soc_compr_get_caps,
255         .get_codec_caps = soc_compr_get_codec_caps
256 };
257
258 /* create a new compress */
259 int soc_new_compress(struct snd_soc_pcm_runtime *rtd, int num)
260 {
261         struct snd_soc_codec *codec = rtd->codec;
262         struct snd_soc_dai *codec_dai = rtd->codec_dai;
263         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
264         struct snd_compr *compr;
265         char new_name[64];
266         int ret = 0, direction = 0;
267
268         /* check client and interface hw capabilities */
269         snprintf(new_name, sizeof(new_name), "%s %s-%d",
270                         rtd->dai_link->stream_name, codec_dai->name, num);
271         direction = SND_COMPRESS_PLAYBACK;
272         compr = kzalloc(sizeof(*compr), GFP_KERNEL);
273         if (compr == NULL) {
274                 snd_printk(KERN_ERR "Cannot allocate compr\n");
275                 return -ENOMEM;
276         }
277
278         compr->ops = &soc_compr_ops;
279         mutex_init(&compr->lock);
280         ret = snd_compress_new(rtd->card->snd_card, num, direction, compr);
281         if (ret < 0) {
282                 pr_err("compress asoc: can't create compress for codec %s\n",
283                         codec->name);
284                 kfree(compr);
285                 return ret;
286         }
287
288         rtd->compr = compr;
289         compr->private_data = rtd;
290
291         printk(KERN_INFO "compress asoc: %s <-> %s mapping ok\n", codec_dai->name,
292                 cpu_dai->name);
293         return ret;
294 }