Merge tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck...
[linux-2.6.git] / sound / soc / soc-generic-dmaengine-pcm.c
blobe29ec3cd84b1301febfdf6ecd25d9ed8c2f57c50
1 /*
2 * Copyright (C) 2013, Analog Devices Inc.
3 * Author: Lars-Peter Clausen <lars@metafoo.de>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
10 * You should have received a copy of the GNU General Public License along
11 * with this program; if not, write to the Free Software Foundation, Inc.,
12 * 675 Mass Ave, Cambridge, MA 02139, USA.
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/dmaengine.h>
18 #include <linux/slab.h>
19 #include <sound/pcm.h>
20 #include <sound/pcm_params.h>
21 #include <sound/soc.h>
22 #include <linux/dma-mapping.h>
23 #include <linux/of.h>
25 #include <sound/dmaengine_pcm.h>
27 struct dmaengine_pcm {
28 struct dma_chan *chan[SNDRV_PCM_STREAM_CAPTURE + 1];
29 const struct snd_dmaengine_pcm_config *config;
30 struct snd_soc_platform platform;
31 unsigned int flags;
34 static struct dmaengine_pcm *soc_platform_to_pcm(struct snd_soc_platform *p)
36 return container_of(p, struct dmaengine_pcm, platform);
39 /**
40 * snd_dmaengine_pcm_prepare_slave_config() - Generic prepare_slave_config callback
41 * @substream: PCM substream
42 * @params: hw_params
43 * @slave_config: DMA slave config to prepare
45 * This function can be used as a generic prepare_slave_config callback for
46 * platforms which make use of the snd_dmaengine_dai_dma_data struct for their
47 * DAI DMA data. Internally the function will first call
48 * snd_hwparams_to_dma_slave_config to fill in the slave config based on the
49 * hw_params, followed by snd_dmaengine_set_config_from_dai_data to fill in the
50 * remaining fields based on the DAI DMA data.
52 int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
53 struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config)
55 struct snd_soc_pcm_runtime *rtd = substream->private_data;
56 struct snd_dmaengine_dai_dma_data *dma_data;
57 int ret;
59 dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
61 ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
62 if (ret)
63 return ret;
65 snd_dmaengine_pcm_set_config_from_dai_data(substream, dma_data,
66 slave_config);
68 return 0;
70 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_prepare_slave_config);
72 static int dmaengine_pcm_hw_params(struct snd_pcm_substream *substream,
73 struct snd_pcm_hw_params *params)
75 struct snd_soc_pcm_runtime *rtd = substream->private_data;
76 struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
77 struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
78 struct dma_slave_config slave_config;
79 int ret;
81 if (pcm->config->prepare_slave_config) {
82 ret = pcm->config->prepare_slave_config(substream, params,
83 &slave_config);
84 if (ret)
85 return ret;
87 ret = dmaengine_slave_config(chan, &slave_config);
88 if (ret)
89 return ret;
92 return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
95 static int dmaengine_pcm_open(struct snd_pcm_substream *substream)
97 struct snd_soc_pcm_runtime *rtd = substream->private_data;
98 struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
99 struct dma_chan *chan = pcm->chan[substream->stream];
100 int ret;
102 ret = snd_soc_set_runtime_hwparams(substream,
103 pcm->config->pcm_hardware);
104 if (ret)
105 return ret;
107 return snd_dmaengine_pcm_open(substream, chan);
110 static struct device *dmaengine_dma_dev(struct dmaengine_pcm *pcm,
111 struct snd_pcm_substream *substream)
113 if (!pcm->chan[substream->stream])
114 return NULL;
116 return pcm->chan[substream->stream]->device->dev;
119 static void dmaengine_pcm_free(struct snd_pcm *pcm)
121 snd_pcm_lib_preallocate_free_for_all(pcm);
124 static struct dma_chan *dmaengine_pcm_compat_request_channel(
125 struct snd_soc_pcm_runtime *rtd,
126 struct snd_pcm_substream *substream)
128 struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
130 if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) && pcm->chan[0])
131 return pcm->chan[0];
133 if (pcm->config->compat_request_channel)
134 return pcm->config->compat_request_channel(rtd, substream);
136 return snd_dmaengine_pcm_request_channel(pcm->config->compat_filter_fn,
137 snd_soc_dai_get_dma_data(rtd->cpu_dai, substream));
140 static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
142 struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
143 const struct snd_dmaengine_pcm_config *config = pcm->config;
144 struct snd_pcm_substream *substream;
145 unsigned int i;
146 int ret;
148 for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
149 substream = rtd->pcm->streams[i].substream;
150 if (!substream)
151 continue;
153 if (!pcm->chan[i] && (pcm->flags & SND_DMAENGINE_PCM_FLAG_COMPAT)) {
154 pcm->chan[i] = dmaengine_pcm_compat_request_channel(rtd,
155 substream);
158 if (!pcm->chan[i]) {
159 dev_err(rtd->platform->dev,
160 "Missing dma channel for stream: %d\n", i);
161 ret = -EINVAL;
162 goto err_free;
165 ret = snd_pcm_lib_preallocate_pages(substream,
166 SNDRV_DMA_TYPE_DEV,
167 dmaengine_dma_dev(pcm, substream),
168 config->prealloc_buffer_size,
169 config->pcm_hardware->buffer_bytes_max);
170 if (ret)
171 goto err_free;
174 return 0;
176 err_free:
177 dmaengine_pcm_free(rtd->pcm);
178 return ret;
181 static const struct snd_pcm_ops dmaengine_pcm_ops = {
182 .open = dmaengine_pcm_open,
183 .close = snd_dmaengine_pcm_close,
184 .ioctl = snd_pcm_lib_ioctl,
185 .hw_params = dmaengine_pcm_hw_params,
186 .hw_free = snd_pcm_lib_free_pages,
187 .trigger = snd_dmaengine_pcm_trigger,
188 .pointer = snd_dmaengine_pcm_pointer,
191 static const struct snd_soc_platform_driver dmaengine_pcm_platform = {
192 .ops = &dmaengine_pcm_ops,
193 .pcm_new = dmaengine_pcm_new,
194 .pcm_free = dmaengine_pcm_free,
195 .probe_order = SND_SOC_COMP_ORDER_LATE,
198 static const struct snd_pcm_ops dmaengine_no_residue_pcm_ops = {
199 .open = dmaengine_pcm_open,
200 .close = snd_dmaengine_pcm_close,
201 .ioctl = snd_pcm_lib_ioctl,
202 .hw_params = dmaengine_pcm_hw_params,
203 .hw_free = snd_pcm_lib_free_pages,
204 .trigger = snd_dmaengine_pcm_trigger,
205 .pointer = snd_dmaengine_pcm_pointer_no_residue,
208 static const struct snd_soc_platform_driver dmaengine_no_residue_pcm_platform = {
209 .ops = &dmaengine_no_residue_pcm_ops,
210 .pcm_new = dmaengine_pcm_new,
211 .pcm_free = dmaengine_pcm_free,
212 .probe_order = SND_SOC_COMP_ORDER_LATE,
215 static const char * const dmaengine_pcm_dma_channel_names[] = {
216 [SNDRV_PCM_STREAM_PLAYBACK] = "tx",
217 [SNDRV_PCM_STREAM_CAPTURE] = "rx",
220 static void dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
221 struct device *dev)
223 unsigned int i;
225 if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_DT) || !dev->of_node)
226 return;
228 if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) {
229 pcm->chan[0] = dma_request_slave_channel(dev, "rx-tx");
230 pcm->chan[1] = pcm->chan[0];
231 } else {
232 for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
233 pcm->chan[i] = dma_request_slave_channel(dev,
234 dmaengine_pcm_dma_channel_names[i]);
240 * snd_dmaengine_pcm_register - Register a dmaengine based PCM device
241 * @dev: The parent device for the PCM device
242 * @config: Platform specific PCM configuration
243 * @flags: Platform specific quirks
245 int snd_dmaengine_pcm_register(struct device *dev,
246 const struct snd_dmaengine_pcm_config *config, unsigned int flags)
248 struct dmaengine_pcm *pcm;
250 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
251 if (!pcm)
252 return -ENOMEM;
254 pcm->config = config;
255 pcm->flags = flags;
257 dmaengine_pcm_request_chan_of(pcm, dev);
259 if (flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
260 return snd_soc_add_platform(dev, &pcm->platform,
261 &dmaengine_no_residue_pcm_platform);
262 else
263 return snd_soc_add_platform(dev, &pcm->platform,
264 &dmaengine_pcm_platform);
266 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_register);
269 * snd_dmaengine_pcm_unregister - Removes a dmaengine based PCM device
270 * @dev: Parent device the PCM was register with
272 * Removes a dmaengine based PCM device previously registered with
273 * snd_dmaengine_pcm_register.
275 void snd_dmaengine_pcm_unregister(struct device *dev)
277 struct snd_soc_platform *platform;
278 struct dmaengine_pcm *pcm;
279 unsigned int i;
281 platform = snd_soc_lookup_platform(dev);
282 if (!platform)
283 return;
285 pcm = soc_platform_to_pcm(platform);
287 for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
288 if (pcm->chan[i]) {
289 dma_release_channel(pcm->chan[i]);
290 if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
291 break;
295 snd_soc_remove_platform(platform);
296 kfree(pcm);
298 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_unregister);
300 MODULE_LICENSE("GPL");