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-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         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  92         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
  93         int err = 0;
  94
  95         if (!cpu_dai->active)
  96                 err = omap_mcpdm_request();
  97
  98         return err;
  99 }
 100
 101 static void omap_mcpdm_dai_shutdown(struct snd_pcm_substream *substream,
 102                                     struct snd_soc_dai *dai)
 103 {
 104         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 105         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 106
 107         if (!cpu_dai->active)
 108                 omap_mcpdm_free();
 109 }
 110
 111 static int omap_mcpdm_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 112                                   struct snd_soc_dai *dai)
 113 {
 114         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 115         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 116         struct omap_mcpdm_data *mcpdm_priv = cpu_dai->private_data;
 117         int stream = substream->stream;
 118         int err = 0;
 119
 120         switch (cmd) {
 121         case SNDRV_PCM_TRIGGER_START:
 122         case SNDRV_PCM_TRIGGER_RESUME:
 123         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 124                 if (!mcpdm_priv->active++)
 125                         omap_mcpdm_start(stream);
 126                 break;
 127
 128         case SNDRV_PCM_TRIGGER_STOP:
 129         case SNDRV_PCM_TRIGGER_SUSPEND:
 130         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 131                 if (!--mcpdm_priv->active)
 132                         omap_mcpdm_stop(stream);
 133                 break;
 134         default:
 135                 err = -EINVAL;
 136         }
 137
 138         return err;
 139 }
 140
 141 static int omap_mcpdm_dai_hw_params(struct snd_pcm_substream *substream,
 142                                     struct snd_pcm_hw_params *params,
 143                                     struct snd_soc_dai *dai)
 144 {
 145         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 146         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 147         struct omap_mcpdm_data *mcpdm_priv = cpu_dai->private_data;
 148         struct omap_mcpdm_link *mcpdm_links = mcpdm_priv->links;
 149         int stream = substream->stream;
 150         int channels, err, link_mask = 0;
 151
 152         snd_soc_dai_set_dma_data(cpu_dai, substream,
 153                                  &omap_mcpdm_dai_dma_params[stream]);
 154
 155         channels = params_channels(params);
 156         switch (channels) {
 157         case 4:
 158                 if (stream == SNDRV_PCM_STREAM_CAPTURE)
 159                         /* up to 2 channels for capture */
 160                         return -EINVAL;
 161                 link_mask |= 1 << 3;
 162         case 3:
 163                 if (stream == SNDRV_PCM_STREAM_CAPTURE)
 164                         /* up to 2 channels for capture */
 165                         return -EINVAL;
 166                 link_mask |= 1 << 2;
 167         case 2:
 168                 link_mask |= 1 << 1;
 169         case 1:
 170                 link_mask |= 1 << 0;
 171                 break;
 172         default:
 173                 /* unsupported number of channels */
 174                 return -EINVAL;
 175         }
 176
 177         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 178                 mcpdm_links[stream].channels = link_mask << 3;
 179                 err = omap_mcpdm_playback_open(&mcpdm_links[stream]);
 180         } else {
 181                 mcpdm_links[stream].channels = link_mask << 0;
 182                 err = omap_mcpdm_capture_open(&mcpdm_links[stream]);
 183         }
 184
 185         return err;
 186 }
 187
 188 static int omap_mcpdm_dai_hw_free(struct snd_pcm_substream *substream,
 189                                   struct snd_soc_dai *dai)
 190 {
 191         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 192         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 193         struct omap_mcpdm_data *mcpdm_priv = cpu_dai->private_data;
 194         struct omap_mcpdm_link *mcpdm_links = mcpdm_priv->links;
 195         int stream = substream->stream;
 196         int err;
 197
 198         if (substream->stream ==  SNDRV_PCM_STREAM_PLAYBACK)
 199                 err = omap_mcpdm_playback_close(&mcpdm_links[stream]);
 200         else
 201                 err = omap_mcpdm_capture_close(&mcpdm_links[stream]);
 202
 203         return err;
 204 }
 205
 206 static struct snd_soc_dai_ops omap_mcpdm_dai_ops = {
 207         .startup        = omap_mcpdm_dai_startup,
 208         .shutdown       = omap_mcpdm_dai_shutdown,
 209         .trigger        = omap_mcpdm_dai_trigger,
 210         .hw_params      = omap_mcpdm_dai_hw_params,
 211         .hw_free        = omap_mcpdm_dai_hw_free,
 212 };
 213
 214 #define OMAP_MCPDM_RATES        (SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
 215 #define OMAP_MCPDM_FORMATS      (SNDRV_PCM_FMTBIT_S32_LE)
 216
 217 struct snd_soc_dai omap_mcpdm_dai = {
 218         .name = "omap-mcpdm",
 219         .id = -1,
 220         .playback = {
 221                 .channels_min = 1,
 222                 .channels_max = 4,
 223                 .rates = OMAP_MCPDM_RATES,
 224                 .formats = OMAP_MCPDM_FORMATS,
 225         },
 226         .capture = {
 227                 .channels_min = 1,
 228                 .channels_max = 2,
 229                 .rates = OMAP_MCPDM_RATES,
 230                 .formats = OMAP_MCPDM_FORMATS,
 231         },
 232         .ops = &omap_mcpdm_dai_ops,
 233         .private_data = &mcpdm_data,
 234 };
 235 EXPORT_SYMBOL_GPL(omap_mcpdm_dai);
 236
 237 static int __init snd_omap_mcpdm_init(void)
 238 {
 239         return snd_soc_register_dai(&omap_mcpdm_dai);
 240 }
 241 module_init(snd_omap_mcpdm_init);
 242
 243 static void __exit snd_omap_mcpdm_exit(void)
 244 {
 245         snd_soc_unregister_dai(&omap_mcpdm_dai);
 246 }
 247 module_exit(snd_omap_mcpdm_exit);
 248
 249 MODULE_AUTHOR("Misael Lopez Cruz <x0052729@ti.com>");
 250 MODULE_DESCRIPTION("OMAP PDM SoC Interface");
 251 MODULE_LICENSE("GPL");