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/dma.h>
  36 #include <plat/mcbsp.h>
  37 #include "mcpdm.h"
  38 #include "omap-pcm.h"
  39
  40 struct omap_mcpdm_data {
  41         struct omap_mcpdm_link *links;
  42         int active;
  43 };
  44
  45 static struct omap_mcpdm_link omap_mcpdm_links[] = {
  46         /* downlink */
  47         {
  48                 .irq_mask = MCPDM_DN_IRQ_EMPTY | MCPDM_DN_IRQ_FULL,
  49                 .threshold = 1,
  50                 .format = PDMOUTFORMAT_LJUST,
  51         },
  52         /* uplink */
  53         {
  54                 .irq_mask = MCPDM_UP_IRQ_EMPTY | MCPDM_UP_IRQ_FULL,
  55                 .threshold = 1,
  56                 .format = PDMOUTFORMAT_LJUST,
  57         },
  58 };
  59
  60 static struct omap_mcpdm_data mcpdm_data = {
  61         .links = omap_mcpdm_links,
  62         .active = 0,
  63 };
  64
  65 /*
  66  * Stream DMA parameters
  67  */
  68 static struct omap_pcm_dma_data omap_mcpdm_dai_dma_params[] = {
  69         {
  70                 .name = "Audio playback",
  71                 .dma_req = OMAP44XX_DMA_MCPDM_DL,
  72                 .data_type = OMAP_DMA_DATA_TYPE_S32,
  73                 .sync_mode = OMAP_DMA_SYNC_PACKET,
  74                 .packet_size = 16,
  75                 .port_addr = OMAP44XX_MCPDM_L3_BASE + MCPDM_DN_DATA,
  76         },
  77         {
  78                 .name = "Audio capture",
  79                 .dma_req = OMAP44XX_DMA_MCPDM_UP,
  80                 .data_type = OMAP_DMA_DATA_TYPE_S32,
  81                 .sync_mode = OMAP_DMA_SYNC_PACKET,
  82                 .packet_size = 16,
  83                 .port_addr = OMAP44XX_MCPDM_L3_BASE + MCPDM_UP_DATA,
  84         },
  85 };
  86
  87 static int omap_mcpdm_dai_startup(struct snd_pcm_substream *substream,
  88                                   struct snd_soc_dai *dai)
  89 {
  90         int err = 0;
  91
  92         if (!dai->active)
  93                 err = omap_mcpdm_request();
  94
  95         return err;
  96 }
  97
  98 static void omap_mcpdm_dai_shutdown(struct snd_pcm_substream *substream,
  99                                     struct snd_soc_dai *dai)
 100 {
 101         if (!dai->active)
 102                 omap_mcpdm_free();
 103 }
 104
 105 static int omap_mcpdm_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 106                                   struct snd_soc_dai *dai)
 107 {
 108         struct omap_mcpdm_data *mcpdm_priv = snd_soc_dai_get_drvdata(dai);
 109         int stream = substream->stream;
 110         int err = 0;
 111
 112         switch (cmd) {
 113         case SNDRV_PCM_TRIGGER_START:
 114         case SNDRV_PCM_TRIGGER_RESUME:
 115         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 116                 if (!mcpdm_priv->active++)
 117                         omap_mcpdm_start(stream);
 118                 break;
 119
 120         case SNDRV_PCM_TRIGGER_STOP:
 121         case SNDRV_PCM_TRIGGER_SUSPEND:
 122         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 123                 if (!--mcpdm_priv->active)
 124                         omap_mcpdm_stop(stream);
 125                 break;
 126         default:
 127                 err = -EINVAL;
 128         }
 129
 130         return err;
 131 }
 132
 133 static int omap_mcpdm_dai_hw_params(struct snd_pcm_substream *substream,
 134                                     struct snd_pcm_hw_params *params,
 135                                     struct snd_soc_dai *dai)
 136 {
 137         struct omap_mcpdm_data *mcpdm_priv = snd_soc_dai_get_drvdata(dai);
 138         struct omap_mcpdm_link *mcpdm_links = mcpdm_priv->links;
 139         int stream = substream->stream;
 140         int channels, err, link_mask = 0;
 141
 142         snd_soc_dai_set_dma_data(dai, substream,
 143                                  &omap_mcpdm_dai_dma_params[stream]);
 144
 145         channels = params_channels(params);
 146         switch (channels) {
 147         case 4:
 148                 if (stream == SNDRV_PCM_STREAM_CAPTURE)
 149                         /* up to 2 channels for capture */
 150                         return -EINVAL;
 151                 link_mask |= 1 << 3;
 152         case 3:
 153                 if (stream == SNDRV_PCM_STREAM_CAPTURE)
 154                         /* up to 2 channels for capture */
 155                         return -EINVAL;
 156                 link_mask |= 1 << 2;
 157         case 2:
 158                 link_mask |= 1 << 1;
 159         case 1:
 160                 link_mask |= 1 << 0;
 161                 break;
 162         default:
 163                 /* unsupported number of channels */
 164                 return -EINVAL;
 165         }
 166
 167         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 168                 mcpdm_links[stream].channels = link_mask << 3;
 169                 err = omap_mcpdm_playback_open(&mcpdm_links[stream]);
 170         } else {
 171                 mcpdm_links[stream].channels = link_mask << 0;
 172                 err = omap_mcpdm_capture_open(&mcpdm_links[stream]);
 173         }
 174
 175         return err;
 176 }
 177
 178 static int omap_mcpdm_dai_hw_free(struct snd_pcm_substream *substream,
 179                                   struct snd_soc_dai *dai)
 180 {
 181         struct omap_mcpdm_data *mcpdm_priv = snd_soc_dai_get_drvdata(dai);
 182         struct omap_mcpdm_link *mcpdm_links = mcpdm_priv->links;
 183         int stream = substream->stream;
 184         int err;
 185
 186         if (substream->stream ==  SNDRV_PCM_STREAM_PLAYBACK)
 187                 err = omap_mcpdm_playback_close(&mcpdm_links[stream]);
 188         else
 189                 err = omap_mcpdm_capture_close(&mcpdm_links[stream]);
 190
 191         return err;
 192 }
 193
 194 static struct snd_soc_dai_ops omap_mcpdm_dai_ops = {
 195         .startup        = omap_mcpdm_dai_startup,
 196         .shutdown       = omap_mcpdm_dai_shutdown,
 197         .trigger        = omap_mcpdm_dai_trigger,
 198         .hw_params      = omap_mcpdm_dai_hw_params,
 199         .hw_free        = omap_mcpdm_dai_hw_free,
 200 };
 201
 202 #define OMAP_MCPDM_RATES        (SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
 203 #define OMAP_MCPDM_FORMATS      (SNDRV_PCM_FMTBIT_S32_LE)
 204
 205 static int omap_mcpdm_dai_probe(struct snd_soc_dai *dai)
 206 {
 207         snd_soc_dai_set_drvdata(dai, &mcpdm_data);
 208         return 0;
 209 }
 210
 211 static struct snd_soc_dai_driver omap_mcpdm_dai = {
 212         .probe = omap_mcpdm_dai_probe,
 213         .playback = {
 214                 .channels_min = 1,
 215                 .channels_max = 4,
 216                 .rates = OMAP_MCPDM_RATES,
 217                 .formats = OMAP_MCPDM_FORMATS,
 218         },
 219         .capture = {
 220                 .channels_min = 1,
 221                 .channels_max = 2,
 222                 .rates = OMAP_MCPDM_RATES,
 223                 .formats = OMAP_MCPDM_FORMATS,
 224         },
 225         .ops = &omap_mcpdm_dai_ops,
 226 };
 227
 228 static __devinit int asoc_mcpdm_probe(struct platform_device *pdev)
 229 {
 230         int ret;
 231
 232         ret = omap_mcpdm_probe(pdev);
 233         if (ret < 0)
 234                 return ret;
 235         ret = snd_soc_register_dai(&pdev->dev, &omap_mcpdm_dai);
 236         if (ret < 0)
 237                 omap_mcpdm_remove(pdev);
 238         return ret;
 239 }
 240
 241 static int __devexit asoc_mcpdm_remove(struct platform_device *pdev)
 242 {
 243         snd_soc_unregister_dai(&pdev->dev);
 244         omap_mcpdm_remove(pdev);
 245         return 0;
 246 }
 247
 248 static struct platform_driver asoc_mcpdm_driver = {
 249         .driver = {
 250                         .name = "omap-mcpdm-dai",
 251                         .owner = THIS_MODULE,
 252         },
 253
 254         .probe = asoc_mcpdm_probe,
 255         .remove = __devexit_p(asoc_mcpdm_remove),
 256 };
 257
 258 static int __init snd_omap_mcpdm_init(void)
 259 {
 260         return platform_driver_register(&asoc_mcpdm_driver);
 261 }
 262 module_init(snd_omap_mcpdm_init);
 263
 264 static void __exit snd_omap_mcpdm_exit(void)
 265 {
 266         platform_driver_unregister(&asoc_mcpdm_driver);
 267 }
 268 module_exit(snd_omap_mcpdm_exit);
 269
 270 MODULE_AUTHOR("Misael Lopez Cruz <x0052729@ti.com>");
 271 MODULE_DESCRIPTION("OMAP PDM SoC Interface");
 272 MODULE_LICENSE("GPL");