drivers/mfd/twl4030-codec.c

   1 /*
   2  * MFD driver for twl4030 codec submodule
   3  *
   4  * Author:      Peter Ujfalusi <peter.ujfalusi@nokia.com>
   5  *
   6  * Copyright:   (C) 2009 Nokia Corporation
   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 version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  *
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/types.h>
  26 #include <linux/slab.h>
  27 #include <linux/kernel.h>
  28 #include <linux/fs.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/i2c/twl.h>
  31 #include <linux/mfd/core.h>
  32 #include <linux/mfd/twl4030-codec.h>
  33
  34 #define TWL4030_CODEC_CELLS     2
  35
  36 static struct platform_device *twl4030_codec_dev;
  37
  38 struct twl4030_codec_resource {
  39         int request_count;
  40         u8 reg;
  41         u8 mask;
  42 };
  43
  44 struct twl4030_codec {
  45         unsigned int audio_mclk;
  46         struct mutex mutex;
  47         struct twl4030_codec_resource resource[TWL4030_CODEC_RES_MAX];
  48         struct mfd_cell cells[TWL4030_CODEC_CELLS];
  49 };
  50
  51 /*
  52  * Modify the resource, the function returns the content of the register
  53  * after the modification.
  54  */
  55 static int twl4030_codec_set_resource(enum twl4030_codec_res id, int enable)
  56 {
  57         struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
  58         u8 val;
  59
  60         twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
  61                         codec->resource[id].reg);
  62
  63         if (enable)
  64                 val |= codec->resource[id].mask;
  65         else
  66                 val &= ~codec->resource[id].mask;
  67
  68         twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
  69                                         val, codec->resource[id].reg);
  70
  71         return val;
  72 }
  73
  74 static inline int twl4030_codec_get_resource(enum twl4030_codec_res id)
  75 {
  76         struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
  77         u8 val;
  78
  79         twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
  80                         codec->resource[id].reg);
  81
  82         return val;
  83 }
  84
  85 /*
  86  * Enable the resource.
  87  * The function returns with error or the content of the register
  88  */
  89 int twl4030_codec_enable_resource(enum twl4030_codec_res id)
  90 {
  91         struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
  92         int val;
  93
  94         if (id >= TWL4030_CODEC_RES_MAX) {
  95                 dev_err(&twl4030_codec_dev->dev,
  96                                 "Invalid resource ID (%u)\n", id);
  97                 return -EINVAL;
  98         }
  99
 100         mutex_lock(&codec->mutex);
 101         if (!codec->resource[id].request_count)
 102                 /* Resource was disabled, enable it */
 103                 val = twl4030_codec_set_resource(id, 1);
 104         else
 105                 val = twl4030_codec_get_resource(id);
 106
 107         codec->resource[id].request_count++;
 108         mutex_unlock(&codec->mutex);
 109
 110         return val;
 111 }
 112 EXPORT_SYMBOL_GPL(twl4030_codec_enable_resource);
 113
 114 /*
 115  * Disable the resource.
 116  * The function returns with error or the content of the register
 117  */
 118 int twl4030_codec_disable_resource(unsigned id)
 119 {
 120         struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
 121         int val;
 122
 123         if (id >= TWL4030_CODEC_RES_MAX) {
 124                 dev_err(&twl4030_codec_dev->dev,
 125                                 "Invalid resource ID (%u)\n", id);
 126                 return -EINVAL;
 127         }
 128
 129         mutex_lock(&codec->mutex);
 130         if (!codec->resource[id].request_count) {
 131                 dev_err(&twl4030_codec_dev->dev,
 132                         "Resource has been disabled already (%u)\n", id);
 133                 mutex_unlock(&codec->mutex);
 134                 return -EPERM;
 135         }
 136         codec->resource[id].request_count--;
 137
 138         if (!codec->resource[id].request_count)
 139                 /* Resource can be disabled now */
 140                 val = twl4030_codec_set_resource(id, 0);
 141         else
 142                 val = twl4030_codec_get_resource(id);
 143
 144         mutex_unlock(&codec->mutex);
 145
 146         return val;
 147 }
 148 EXPORT_SYMBOL_GPL(twl4030_codec_disable_resource);
 149
 150 unsigned int twl4030_codec_get_mclk(void)
 151 {
 152         struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
 153
 154         return codec->audio_mclk;
 155 }
 156 EXPORT_SYMBOL_GPL(twl4030_codec_get_mclk);
 157
 158 static int __devinit twl4030_codec_probe(struct platform_device *pdev)
 159 {
 160         struct twl4030_codec *codec;
 161         struct twl4030_codec_data *pdata = pdev->dev.platform_data;
 162         struct mfd_cell *cell = NULL;
 163         int ret, childs = 0;
 164         u8 val;
 165
 166         if (!pdata) {
 167                 dev_err(&pdev->dev, "Platform data is missing\n");
 168                 return -EINVAL;
 169         }
 170
 171         /* Configure APLL_INFREQ and disable APLL if enabled */
 172         val = 0;
 173         switch (pdata->audio_mclk) {
 174         case 19200000:
 175                 val |= TWL4030_APLL_INFREQ_19200KHZ;
 176                 break;
 177         case 26000000:
 178                 val |= TWL4030_APLL_INFREQ_26000KHZ;
 179                 break;
 180         case 38400000:
 181                 val |= TWL4030_APLL_INFREQ_38400KHZ;
 182                 break;
 183         default:
 184                 dev_err(&pdev->dev, "Invalid audio_mclk\n");
 185                 return -EINVAL;
 186         }
 187         twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
 188                                         val, TWL4030_REG_APLL_CTL);
 189
 190         codec = kzalloc(sizeof(struct twl4030_codec), GFP_KERNEL);
 191         if (!codec)
 192                 return -ENOMEM;
 193
 194         platform_set_drvdata(pdev, codec);
 195
 196         twl4030_codec_dev = pdev;
 197         mutex_init(&codec->mutex);
 198         codec->audio_mclk = pdata->audio_mclk;
 199
 200         /* Codec power */
 201         codec->resource[TWL4030_CODEC_RES_POWER].reg = TWL4030_REG_CODEC_MODE;
 202         codec->resource[TWL4030_CODEC_RES_POWER].mask = TWL4030_CODECPDZ;
 203
 204         /* PLL */
 205         codec->resource[TWL4030_CODEC_RES_APLL].reg = TWL4030_REG_APLL_CTL;
 206         codec->resource[TWL4030_CODEC_RES_APLL].mask = TWL4030_APLL_EN;
 207
 208         if (pdata->audio) {
 209                 cell = &codec->cells[childs];
 210                 cell->name = "twl4030-codec";
 211                 cell->mfd_data = pdata->audio;
 212                 childs++;
 213         }
 214         if (pdata->vibra) {
 215                 cell = &codec->cells[childs];
 216                 cell->name = "twl4030-vibra";
 217                 cell->mfd_data = pdata->vibra;
 218                 childs++;
 219         }
 220
 221         if (childs)
 222                 ret = mfd_add_devices(&pdev->dev, pdev->id, codec->cells,
 223                                       childs, NULL, 0);
 224         else {
 225                 dev_err(&pdev->dev, "No platform data found for childs\n");
 226                 ret = -ENODEV;
 227         }
 228
 229         if (!ret)
 230                 return 0;
 231
 232         platform_set_drvdata(pdev, NULL);
 233         kfree(codec);
 234         twl4030_codec_dev = NULL;
 235         return ret;
 236 }
 237
 238 static int __devexit twl4030_codec_remove(struct platform_device *pdev)
 239 {
 240         struct twl4030_codec *codec = platform_get_drvdata(pdev);
 241
 242         mfd_remove_devices(&pdev->dev);
 243         platform_set_drvdata(pdev, NULL);
 244         kfree(codec);
 245         twl4030_codec_dev = NULL;
 246
 247         return 0;
 248 }
 249
 250 MODULE_ALIAS("platform:twl4030-audio");
 251
 252 static struct platform_driver twl4030_codec_driver = {
 253         .probe          = twl4030_codec_probe,
 254         .remove         = __devexit_p(twl4030_codec_remove),
 255         .driver         = {
 256                 .owner  = THIS_MODULE,
 257                 .name   = "twl4030-audio",
 258         },
 259 };
 260
 261 static int __devinit twl4030_codec_init(void)
 262 {
 263         return platform_driver_register(&twl4030_codec_driver);
 264 }
 265 module_init(twl4030_codec_init);
 266
 267 static void __devexit twl4030_codec_exit(void)
 268 {
 269         platform_driver_unregister(&twl4030_codec_driver);
 270 }
 271 module_exit(twl4030_codec_exit);
 272
 273 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@nokia.com>");
 274 MODULE_LICENSE("GPL");
 275