sound/soc/omap/omap-mcpdm.c

   1 /*
   2  * omap-mcpdm.c  --  OMAP ALSA SoC DAI driver using McPDM port
   3  *
   4  * Copyright (C) 2009 Texas Instruments
   5  *
   6  * Author: Misael Lopez Cruz <x0052729@ti.com>
   7  * Contact: Jorge Eduardo Candelaria <x0107209@ti.com>
   8  *          Margarita Olaya <magi.olaya@ti.com>
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * version 2 as published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  22  * 02110-1301 USA
  23  *
  24  */
  25
  26 #include <linux/init.h>
  27 #include <linux/module.h>
  28 #include <linux/device.h>
  29 #include <sound/core.h>
  30 #include <sound/pcm.h>
  31 #include <sound/pcm_params.h>
  32 #include <sound/initval.h>
  33 #include <sound/soc.h>
  34
  35 #include <plat/control.h>
  36 #include <plat/dma.h>
  37 #include <plat/mcbsp.h>
  38 #include "mcpdm.h"
  39 #include "omap-pcm.h"
  40
  41 struct omap_mcpdm_data {
  42         struct omap_mcpdm_link *links;
  43         int active;
  44 };
  45
  46 static struct omap_mcpdm_link omap_mcpdm_links[] = {
  47         /* downlink */
  48         {
  49                 .irq_mask = MCPDM_DN_IRQ_EMPTY | MCPDM_DN_IRQ_FULL,
  50                 .threshold = 1,
  51                 .format = PDMOUTFORMAT_LJUST,
  52         },
  53         /* uplink */
  54         {
  55                 .irq_mask = MCPDM_UP_IRQ_EMPTY | MCPDM_UP_IRQ_FULL,
  56                 .threshold = 1,
  57                 .format = PDMOUTFORMAT_LJUST,
  58         },
  59 };
  60
  61 static struct omap_mcpdm_data mcpdm_data = {
  62         .links = omap_mcpdm_links,
  63         .active = 0,
  64 };
  65
  66 /*
  67  * Stream DMA parameters
  68  */
  69 static struct omap_pcm_dma_data omap_mcpdm_dai_dma_params[] = {
  70         {
  71                 .name = "Audio playback",
  72                 .dma_req = OMAP44XX_DMA_MCPDM_DL,
  73                 .data_type = OMAP_DMA_DATA_TYPE_S32,
  74                 .sync_mode = OMAP_DMA_SYNC_PACKET,
  75                 .packet_size = 16,
  76                 .port_addr = OMAP44XX_MCPDM_L3_BASE + MCPDM_DN_DATA,
  77         },
  78         {
  79                 .name = "Audio capture",
  80                 .dma_req = OMAP44XX_DMA_MCPDM_UP,
  81                 .data_type = OMAP_DMA_DATA_TYPE_S32,
  82                 .sync_mode = OMAP_DMA_SYNC_PACKET,
  83                 .packet_size = 16,
  84                 .port_addr = OMAP44XX_MCPDM_L3_BASE + MCPDM_UP_DATA,
  85         },
  86 };
  87
  88 static int omap_mcpdm_dai_startup(struct snd_pcm_substream *substream,
  89                                   struct snd_soc_dai *dai)
  90 {
  91         int err = 0;
  92
  93         if (!dai->active)
  94                 err = omap_mcpdm_request();
  95
  96         return err;
  97 }
  98
  99 static void omap_mcpdm_dai_shutdown(struct snd_pcm_substream *substream,
 100                                     struct snd_soc_dai *dai)
 101 {
 102         if (!dai->active)
 103                 omap_mcpdm_free();
 104 }
 105
 106 static int omap_mcpdm_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 107                                   struct snd_soc_dai *dai)
 108 {
 109         struct omap_mcpdm_data *mcpdm_priv = snd_soc_dai_get_drvdata(dai);
 110         int stream = substream->stream;
 111         int err = 0;
 112
 113         switch (cmd) {
 114         case SNDRV_PCM_TRIGGER_START:
 115         case SNDRV_PCM_TRIGGER_RESUME:
 116         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 117                 if (!mcpdm_priv->active++)
 118                         omap_mcpdm_start(stream);
 119                 break;
 120
 121         case SNDRV_PCM_TRIGGER_STOP:
 122         case SNDRV_PCM_TRIGGER_SUSPEND:
 123         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 124                 if (!--mcpdm_priv->active)
 125                         omap_mcpdm_stop(stream);
 126                 break;
 127         default:
 128                 err = -EINVAL;
 129         }
 130
 131         return err;
 132 }
 133
 134 static int omap_mcpdm_dai_hw_params(struct snd_pcm_substream *substream,
 135                                     struct snd_pcm_hw_params *params,
 136                                     struct snd_soc_dai *dai)
 137 {
 138         struct omap_mcpdm_data *mcpdm_priv = snd_soc_dai_get_drvdata(dai);
 139         struct omap_mcpdm_link *mcpdm_links = mcpdm_priv->links;
 140         int stream = substream->stream;
 141         int channels, err, link_mask = 0;
 142
 143         snd_soc_dai_set_dma_data(dai, substream,
 144                                  &omap_mcpdm_dai_dma_params[stream]);
 145
 146         channels = params_channels(params);
 147         switch (channels) {
 148         case 4:
 149                 if (stream == SNDRV_PCM_STREAM_CAPTURE)
 150                         /* up to 2 channels for capture */
 151                         return -EINVAL;
 152                 link_mask |= 1 << 3;
 153         case 3:
 154                 if (stream == SNDRV_PCM_STREAM_CAPTURE)
 155                         /* up to 2 channels for capture */
 156                         return -EINVAL;
 157                 link_mask |= 1 << 2;
 158         case 2:
 159                 link_mask |= 1 << 1;
 160         case 1:
 161                 link_mask |= 1 << 0;
 162                 break;
 163         default:
 164                 /* unsupported number of channels */
 165                 return -EINVAL;
 166         }
 167
 168         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 169                 mcpdm_links[stream].channels = link_mask << 3;
 170                 err = omap_mcpdm_playback_open(&mcpdm_links[stream]);
 171         } else {
 172                 mcpdm_links[stream].channels = link_mask << 0;
 173                 err = omap_mcpdm_capture_open(&mcpdm_links[stream]);
 174         }
 175
 176         return err;
 177 }
 178
 179 static int omap_mcpdm_dai_hw_free(struct snd_pcm_substream *substream,
 180                                   struct snd_soc_dai *dai)
 181 {
 182         struct omap_mcpdm_data *mcpdm_priv = snd_soc_dai_get_drvdata(dai);
 183         struct omap_mcpdm_link *mcpdm_links = mcpdm_priv->links;
 184         int stream = substream->stream;
 185         int err;
 186
 187         if (substream->stream ==  SNDRV_PCM_STREAM_PLAYBACK)
 188                 err = omap_mcpdm_playback_close(&mcpdm_links[stream]);
 189         else
 190                 err = omap_mcpdm_capture_close(&mcpdm_links[stream]);
 191
 192         return err;
 193 }
 194
 195 static struct snd_soc_dai_ops omap_mcpdm_dai_ops = {
 196         .startup        = omap_mcpdm_dai_startup,
 197         .shutdown       = omap_mcpdm_dai_shutdown,
 198         .trigger        = omap_mcpdm_dai_trigger,
 199         .hw_params      = omap_mcpdm_dai_hw_params,
 200         .hw_free        = omap_mcpdm_dai_hw_free,
 201 };
 202
 203 #define OMAP_MCPDM_RATES        (SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
 204 #define OMAP_MCPDM_FORMATS      (SNDRV_PCM_FMTBIT_S32_LE)
 205
 206 static int omap_mcpdm_dai_probe(struct snd_soc_dai *dai)
 207 {
 208         snd_soc_dai_set_drvdata(dai, &mcpdm_data);
 209         return 0;
 210 }
 211
 212 static struct snd_soc_dai_driver omap_mcpdm_dai = {
 213         .probe = omap_mcpdm_dai_probe,
 214         .playback = {
 215                 .channels_min = 1,
 216                 .channels_max = 4,
 217                 .rates = OMAP_MCPDM_RATES,
 218                 .formats = OMAP_MCPDM_FORMATS,
 219         },
 220         .capture = {
 221                 .channels_min = 1,
 222                 .channels_max = 2,
 223                 .rates = OMAP_MCPDM_RATES,
 224                 .formats = OMAP_MCPDM_FORMATS,
 225         },
 226         .ops = &omap_mcpdm_dai_ops,
 227 };
 228
 229 static __devinit int asoc_mcpdm_probe(struct platform_device *pdev)
 230 {
 231         int ret;
 232
 233         ret = omap_mcpdm_probe(pdev);
 234         if (ret < 0)
 235                 return ret;
 236         ret = snd_soc_register_dai(&pdev->dev, &omap_mcpdm_dai);
 237         if (ret < 0)
 238                 omap_mcpdm_remove(pdev);
 239         return ret;
 240 }
 241
 242 static int __devexit asoc_mcpdm_remove(struct platform_device *pdev)
 243 {
 244         snd_soc_unregister_dai(&pdev->dev);
 245         omap_mcpdm_remove(pdev);
 246         return 0;
 247 }
 248
 249 static struct platform_driver asoc_mcpdm_driver = {
 250         .driver = {
 251                         .name = "omap-mcpdm-dai",
 252                         .owner = THIS_MODULE,
 253         },
 254
 255         .probe = asoc_mcpdm_probe,
 256         .remove = __devexit_p(asoc_mcpdm_remove),
 257 };
 258
 259 static int __init snd_omap_mcpdm_init(void)
 260 {
 261         return platform_driver_register(&asoc_mcpdm_driver);
 262 }
 263 module_init(snd_omap_mcpdm_init);
 264
 265 static void __exit snd_omap_mcpdm_exit(void)
 266 {
 267         platform_driver_unregister(&asoc_mcpdm_driver);
 268 }
 269 module_exit(snd_omap_mcpdm_exit);
 270
 271 MODULE_AUTHOR("Misael Lopez Cruz <x0052729@ti.com>");
 272 MODULE_DESCRIPTION("OMAP PDM SoC Interface");
 273 MODULE_LICENSE("GPL");