ASoC: davinci-vcif - fix a memory leak
[linux-3.10.git] / sound / soc / davinci / davinci-vcif.c
1 /*
2  * ALSA SoC Voice Codec Interface for TI DAVINCI processor
3  *
4  * Copyright (C) 2010 Texas Instruments.
5  *
6  * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21  */
22
23 #include <linux/init.h>
24 #include <linux/module.h>
25 #include <linux/device.h>
26 #include <linux/delay.h>
27 #include <linux/slab.h>
28 #include <linux/io.h>
29 #include <linux/mfd/davinci_voicecodec.h>
30
31 #include <sound/core.h>
32 #include <sound/pcm.h>
33 #include <sound/pcm_params.h>
34 #include <sound/initval.h>
35 #include <sound/soc.h>
36
37 #include "davinci-pcm.h"
38 #include "davinci-i2s.h"
39
40 #define MOD_REG_BIT(val, mask, set) do { \
41         if (set) { \
42                 val |= mask; \
43         } else { \
44                 val &= ~mask; \
45         } \
46 } while (0)
47
48 struct davinci_vcif_dev {
49         struct davinci_vc *davinci_vc;
50         struct davinci_pcm_dma_params   dma_params[2];
51 };
52
53 static void davinci_vcif_start(struct snd_pcm_substream *substream)
54 {
55         struct snd_soc_pcm_runtime *rtd = substream->private_data;
56         struct davinci_vcif_dev *davinci_vcif_dev =
57                         snd_soc_dai_get_drvdata(rtd->cpu_dai);
58         struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
59         u32 w;
60
61         /* Start the sample generator and enable transmitter/receiver */
62         w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
63
64         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
65                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 1);
66         else
67                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 1);
68
69         writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
70 }
71
72 static void davinci_vcif_stop(struct snd_pcm_substream *substream)
73 {
74         struct snd_soc_pcm_runtime *rtd = substream->private_data;
75         struct davinci_vcif_dev *davinci_vcif_dev =
76                         snd_soc_dai_get_drvdata(rtd->cpu_dai);
77         struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
78         u32 w;
79
80         /* Reset transmitter/receiver and sample rate/frame sync generators */
81         w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
82         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
83                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 0);
84         else
85                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 0);
86
87         writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
88 }
89
90 static int davinci_vcif_hw_params(struct snd_pcm_substream *substream,
91                                   struct snd_pcm_hw_params *params,
92                                   struct snd_soc_dai *dai)
93 {
94         struct davinci_vcif_dev *davinci_vcif_dev = snd_soc_dai_get_drvdata(dai);
95         struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
96         struct davinci_pcm_dma_params *dma_params =
97                         &davinci_vcif_dev->dma_params[substream->stream];
98         u32 w;
99
100         /* Restart the codec before setup */
101         davinci_vcif_stop(substream);
102         davinci_vcif_start(substream);
103
104         /* General line settings */
105         writel(DAVINCI_VC_CTRL_MASK, davinci_vc->base + DAVINCI_VC_CTRL);
106
107         writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTCLR);
108
109         writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTEN);
110
111         w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
112
113         /* Determine xfer data type */
114         switch (params_format(params)) {
115         case SNDRV_PCM_FORMAT_U8:
116                 dma_params->data_type = 0;
117
118                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
119                             DAVINCI_VC_CTRL_RD_UNSIGNED |
120                             DAVINCI_VC_CTRL_WD_BITS_8 |
121                             DAVINCI_VC_CTRL_WD_UNSIGNED, 1);
122                 break;
123         case SNDRV_PCM_FORMAT_S8:
124                 dma_params->data_type = 1;
125
126                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
127                             DAVINCI_VC_CTRL_WD_BITS_8, 1);
128
129                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_UNSIGNED |
130                             DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
131                 break;
132         case SNDRV_PCM_FORMAT_S16_LE:
133                 dma_params->data_type = 2;
134
135                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
136                             DAVINCI_VC_CTRL_RD_UNSIGNED |
137                             DAVINCI_VC_CTRL_WD_BITS_8 |
138                             DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
139                 break;
140         default:
141                 printk(KERN_WARNING "davinci-vcif: unsupported PCM format");
142                 return -EINVAL;
143         }
144
145         dma_params->acnt  = dma_params->data_type;
146
147         writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
148
149         return 0;
150 }
151
152 static int davinci_vcif_trigger(struct snd_pcm_substream *substream, int cmd,
153                                 struct snd_soc_dai *dai)
154 {
155         int ret = 0;
156
157         switch (cmd) {
158         case SNDRV_PCM_TRIGGER_START:
159         case SNDRV_PCM_TRIGGER_RESUME:
160         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
161                 davinci_vcif_start(substream);
162         case SNDRV_PCM_TRIGGER_STOP:
163         case SNDRV_PCM_TRIGGER_SUSPEND:
164         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
165                 davinci_vcif_stop(substream);
166                 break;
167         default:
168                 ret = -EINVAL;
169         }
170
171         return ret;
172 }
173
174 static int davinci_vcif_startup(struct snd_pcm_substream *substream,
175                                 struct snd_soc_dai *dai)
176 {
177         struct davinci_vcif_dev *dev = snd_soc_dai_get_drvdata(dai);
178
179         snd_soc_dai_set_dma_data(dai, substream, dev->dma_params);
180         return 0;
181 }
182
183 #define DAVINCI_VCIF_RATES      SNDRV_PCM_RATE_8000_48000
184
185 static struct snd_soc_dai_ops davinci_vcif_dai_ops = {
186         .startup        = davinci_vcif_startup,
187         .trigger        = davinci_vcif_trigger,
188         .hw_params      = davinci_vcif_hw_params,
189 };
190
191 static struct snd_soc_dai_driver davinci_vcif_dai = {
192         .playback = {
193                 .channels_min = 1,
194                 .channels_max = 2,
195                 .rates = DAVINCI_VCIF_RATES,
196                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
197         .capture = {
198                 .channels_min = 1,
199                 .channels_max = 2,
200                 .rates = DAVINCI_VCIF_RATES,
201                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
202         .ops = &davinci_vcif_dai_ops,
203
204 };
205
206 static int davinci_vcif_probe(struct platform_device *pdev)
207 {
208         struct davinci_vc *davinci_vc = platform_get_drvdata(pdev);
209         struct davinci_vcif_dev *davinci_vcif_dev;
210         int ret;
211
212         davinci_vcif_dev = kzalloc(sizeof(struct davinci_vcif_dev), GFP_KERNEL);
213         if (!davinci_vcif_dev) {
214                 dev_dbg(&pdev->dev,
215                         "could not allocate memory for private data\n");
216                 return -ENOMEM;
217         }
218
219         /* DMA tx params */
220         davinci_vcif_dev->davinci_vc = davinci_vc;
221         davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].channel =
222                                         davinci_vc->davinci_vcif.dma_tx_channel;
223         davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].dma_addr =
224                                         davinci_vc->davinci_vcif.dma_tx_addr;
225
226         /* DMA rx params */
227         davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].channel =
228                                         davinci_vc->davinci_vcif.dma_rx_channel;
229         davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].dma_addr =
230                                         davinci_vc->davinci_vcif.dma_rx_addr;
231
232         dev_set_drvdata(&pdev->dev, davinci_vcif_dev);
233
234         ret = snd_soc_register_dai(&pdev->dev, &davinci_vcif_dai);
235         if (ret != 0) {
236                 dev_err(&pdev->dev, "could not register dai\n");
237                 goto fail;
238         }
239
240         return 0;
241
242 fail:
243         kfree(davinci_vcif_dev);
244
245         return ret;
246 }
247
248 static int davinci_vcif_remove(struct platform_device *pdev)
249 {
250         struct davinci_vcif_dev *davinci_vcif_dev = dev_get_drvdata(&pdev->dev);
251
252         snd_soc_unregister_dai(&pdev->dev);
253         kfree(davinci_vcif_dev);
254
255         return 0;
256 }
257
258 static struct platform_driver davinci_vcif_driver = {
259         .probe          = davinci_vcif_probe,
260         .remove         = davinci_vcif_remove,
261         .driver         = {
262                 .name   = "davinci-vcif",
263                 .owner  = THIS_MODULE,
264         },
265 };
266
267 static int __init davinci_vcif_init(void)
268 {
269         return platform_driver_probe(&davinci_vcif_driver, davinci_vcif_probe);
270 }
271 module_init(davinci_vcif_init);
272
273 static void __exit davinci_vcif_exit(void)
274 {
275         platform_driver_unregister(&davinci_vcif_driver);
276 }
277 module_exit(davinci_vcif_exit);
278
279 MODULE_AUTHOR("Miguel Aguilar");
280 MODULE_DESCRIPTION("Texas Instruments DaVinci ASoC Voice Codec Interface");
281 MODULE_LICENSE("GPL");