sound/soc/blackfin/bf6xx-i2s.c

   1 /*
   2  * bf6xx-i2s.c - Analog Devices BF6XX i2s interface driver
   3  *
   4  * Copyright (c) 2012 Analog Devices Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19
  20 #include <linux/device.h>
  21 #include <linux/init.h>
  22 #include <linux/module.h>
  23 #include <linux/platform_device.h>
  24 #include <sound/pcm.h>
  25 #include <sound/pcm_params.h>
  26 #include <sound/soc.h>
  27 #include <sound/soc-dai.h>
  28
  29 #include "bf6xx-sport.h"
  30
  31 struct sport_params param;
  32
  33 static int bfin_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
  34                 unsigned int fmt)
  35 {
  36         struct sport_device *sport = snd_soc_dai_get_drvdata(cpu_dai);
  37         struct device *dev = &sport->pdev->dev;
  38         int ret = 0;
  39
  40         param.spctl &= ~(SPORT_CTL_OPMODE | SPORT_CTL_CKRE | SPORT_CTL_FSR
  41                         | SPORT_CTL_LFS | SPORT_CTL_LAFS);
  42         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
  43         case SND_SOC_DAIFMT_I2S:
  44                 param.spctl |= SPORT_CTL_OPMODE | SPORT_CTL_CKRE
  45                         | SPORT_CTL_LFS;
  46                 break;
  47         case SND_SOC_DAIFMT_DSP_A:
  48                 param.spctl |= SPORT_CTL_FSR;
  49                 break;
  50         case SND_SOC_DAIFMT_LEFT_J:
  51                 param.spctl |= SPORT_CTL_OPMODE | SPORT_CTL_LFS
  52                         | SPORT_CTL_LAFS;
  53                 break;
  54         default:
  55                 dev_err(dev, "%s: Unknown DAI format type\n", __func__);
  56                 ret = -EINVAL;
  57                 break;
  58         }
  59
  60         param.spctl &= ~(SPORT_CTL_ICLK | SPORT_CTL_IFS);
  61         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
  62         case SND_SOC_DAIFMT_CBM_CFM:
  63                 break;
  64         case SND_SOC_DAIFMT_CBS_CFS:
  65         case SND_SOC_DAIFMT_CBM_CFS:
  66         case SND_SOC_DAIFMT_CBS_CFM:
  67                 ret = -EINVAL;
  68                 break;
  69         default:
  70                 dev_err(dev, "%s: Unknown DAI master type\n", __func__);
  71                 ret = -EINVAL;
  72                 break;
  73         }
  74
  75         return ret;
  76 }
  77
  78 static int bfin_i2s_hw_params(struct snd_pcm_substream *substream,
  79                                 struct snd_pcm_hw_params *params,
  80                                 struct snd_soc_dai *dai)
  81 {
  82         struct sport_device *sport = snd_soc_dai_get_drvdata(dai);
  83         struct device *dev = &sport->pdev->dev;
  84         int ret = 0;
  85
  86         param.spctl &= ~SPORT_CTL_SLEN;
  87         switch (params_format(params)) {
  88         case SNDRV_PCM_FORMAT_S8:
  89                 param.spctl |= 0x70;
  90                 sport->wdsize = 1;
  91         case SNDRV_PCM_FORMAT_S16_LE:
  92                 param.spctl |= 0xf0;
  93                 sport->wdsize = 2;
  94                 break;
  95         case SNDRV_PCM_FORMAT_S24_LE:
  96                 param.spctl |= 0x170;
  97                 sport->wdsize = 3;
  98                 break;
  99         case SNDRV_PCM_FORMAT_S32_LE:
 100                 param.spctl |= 0x1f0;
 101                 sport->wdsize = 4;
 102                 break;
 103         }
 104
 105         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 106                 ret = sport_set_tx_params(sport, &param);
 107                 if (ret) {
 108                         dev_err(dev, "SPORT tx is busy!\n");
 109                         return ret;
 110                 }
 111         } else {
 112                 ret = sport_set_rx_params(sport, &param);
 113                 if (ret) {
 114                         dev_err(dev, "SPORT rx is busy!\n");
 115                         return ret;
 116                 }
 117         }
 118         return 0;
 119 }
 120
 121 #ifdef CONFIG_PM
 122 static int bfin_i2s_suspend(struct snd_soc_dai *dai)
 123 {
 124         struct sport_device *sport = snd_soc_dai_get_drvdata(dai);
 125
 126         if (dai->capture_active)
 127                 sport_rx_stop(sport);
 128         if (dai->playback_active)
 129                 sport_tx_stop(sport);
 130         return 0;
 131 }
 132
 133 static int bfin_i2s_resume(struct snd_soc_dai *dai)
 134 {
 135         struct sport_device *sport = snd_soc_dai_get_drvdata(dai);
 136         struct device *dev = &sport->pdev->dev;
 137         int ret;
 138
 139         ret = sport_set_tx_params(sport, &param);
 140         if (ret) {
 141                 dev_err(dev, "SPORT tx is busy!\n");
 142                 return ret;
 143         }
 144         ret = sport_set_rx_params(sport, &param);
 145         if (ret) {
 146                 dev_err(dev, "SPORT rx is busy!\n");
 147                 return ret;
 148         }
 149
 150         return 0;
 151 }
 152
 153 #else
 154 #define bfin_i2s_suspend NULL
 155 #define bfin_i2s_resume NULL
 156 #endif
 157
 158 #define BFIN_I2S_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
 159                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | \
 160                 SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | \
 161                 SNDRV_PCM_RATE_96000)
 162
 163 #define BFIN_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE | \
 164                 SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
 165
 166 static struct snd_soc_dai_ops bfin_i2s_dai_ops = {
 167         .hw_params      = bfin_i2s_hw_params,
 168         .set_fmt        = bfin_i2s_set_dai_fmt,
 169 };
 170
 171 static struct snd_soc_dai_driver bfin_i2s_dai = {
 172         .suspend = bfin_i2s_suspend,
 173         .resume = bfin_i2s_resume,
 174         .playback = {
 175                 .channels_min = 1,
 176                 .channels_max = 2,
 177                 .rates = BFIN_I2S_RATES,
 178                 .formats = BFIN_I2S_FORMATS,
 179         },
 180         .capture = {
 181                 .channels_min = 1,
 182                 .channels_max = 2,
 183                 .rates = BFIN_I2S_RATES,
 184                 .formats = BFIN_I2S_FORMATS,
 185         },
 186         .ops = &bfin_i2s_dai_ops,
 187 };
 188
 189 static int bfin_i2s_probe(struct platform_device *pdev)
 190 {
 191         struct sport_device *sport;
 192         struct device *dev = &pdev->dev;
 193         int ret;
 194
 195         sport = sport_create(pdev);
 196         if (!sport)
 197                 return -ENODEV;
 198
 199         /* register with the ASoC layers */
 200         ret = snd_soc_register_dai(dev, &bfin_i2s_dai);
 201         if (ret) {
 202                 dev_err(dev, "Failed to register DAI: %d\n", ret);
 203                 sport_delete(sport);
 204                 return ret;
 205         }
 206         platform_set_drvdata(pdev, sport);
 207
 208         return 0;
 209 }
 210
 211 static int bfin_i2s_remove(struct platform_device *pdev)
 212 {
 213         struct sport_device *sport = platform_get_drvdata(pdev);
 214
 215         snd_soc_unregister_dai(&pdev->dev);
 216         sport_delete(sport);
 217
 218         return 0;
 219 }
 220
 221 static struct platform_driver bfin_i2s_driver = {
 222         .probe  = bfin_i2s_probe,
 223         .remove = bfin_i2s_remove,
 224         .driver = {
 225                 .name = "bfin-i2s",
 226                 .owner = THIS_MODULE,
 227         },
 228 };
 229
 230 module_platform_driver(bfin_i2s_driver);
 231
 232 MODULE_DESCRIPTION("Analog Devices BF6XX i2s interface driver");
 233 MODULE_AUTHOR("Scott Jiang <Scott.Jiang.Linux@gmail.com>");
 234 MODULE_LICENSE("GPL v2");