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/kernel.h>
  27 #include <linux/fs.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/i2c/twl.h>
  30 #include <linux/mfd/core.h>
  31 #include <linux/mfd/twl4030-codec.h>
  32
  33 #define TWL4030_CODEC_CELLS     2
  34
  35 static struct platform_device *twl4030_codec_dev;
  36
  37 struct twl4030_codec_resource {
  38         int request_count;
  39         u8 reg;
  40         u8 mask;
  41 };
  42
  43 struct twl4030_codec {
  44         unsigned int audio_mclk;
  45         struct mutex mutex;
  46         struct twl4030_codec_resource resource[TWL4030_CODEC_RES_MAX];
  47         struct mfd_cell cells[TWL4030_CODEC_CELLS];
  48 };
  49
  50 /*
  51  * Modify the resource, the function returns the content of the register
  52  * after the modification.
  53  */
  54 static int twl4030_codec_set_resource(enum twl4030_codec_res id, int enable)
  55 {
  56         struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
  57         u8 val;
  58
  59         twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
  60                         codec->resource[id].reg);
  61
  62         if (enable)
  63                 val |= codec->resource[id].mask;
  64         else
  65                 val &= ~codec->resource[id].mask;
  66
  67         twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
  68                                         val, codec->resource[id].reg);
  69
  70         return val;
  71 }
  72
  73 static inline int twl4030_codec_get_resource(enum twl4030_codec_res id)
  74 {
  75         struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
  76         u8 val;
  77
  78         twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
  79                         codec->resource[id].reg);
  80
  81         return val;
  82 }
  83
  84 /*
  85  * Enable the resource.
  86  * The function returns with error or the content of the register
  87  */
  88 int twl4030_codec_enable_resource(enum twl4030_codec_res id)
  89 {
  90         struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
  91         int val;
  92
  93         if (id >= TWL4030_CODEC_RES_MAX) {
  94                 dev_err(&twl4030_codec_dev->dev,
  95                                 "Invalid resource ID (%u)\n", id);
  96                 return -EINVAL;
  97         }
  98
  99         mutex_lock(&codec->mutex);
 100         if (!codec->resource[id].request_count)
 101                 /* Resource was disabled, enable it */
 102                 val = twl4030_codec_set_resource(id, 1);
 103         else
 104                 val = twl4030_codec_get_resource(id);
 105
 106         codec->resource[id].request_count++;
 107         mutex_unlock(&codec->mutex);
 108
 109         return val;
 110 }
 111 EXPORT_SYMBOL_GPL(twl4030_codec_enable_resource);
 112
 113 /*
 114  * Disable the resource.
 115  * The function returns with error or the content of the register
 116  */
 117 int twl4030_codec_disable_resource(unsigned id)
 118 {
 119         struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
 120         int val;
 121
 122         if (id >= TWL4030_CODEC_RES_MAX) {
 123                 dev_err(&twl4030_codec_dev->dev,
 124                                 "Invalid resource ID (%u)\n", id);
 125                 return -EINVAL;
 126         }
 127
 128         mutex_lock(&codec->mutex);
 129         if (!codec->resource[id].request_count) {
 130                 dev_err(&twl4030_codec_dev->dev,
 131                         "Resource has been disabled already (%u)\n", id);
 132                 mutex_unlock(&codec->mutex);
 133                 return -EPERM;
 134         }
 135         codec->resource[id].request_count--;
 136
 137         if (!codec->resource[id].request_count)
 138                 /* Resource can be disabled now */
 139                 val = twl4030_codec_set_resource(id, 0);
 140         else
 141                 val = twl4030_codec_get_resource(id);
 142
 143         mutex_unlock(&codec->mutex);
 144
 145         return val;
 146 }
 147 EXPORT_SYMBOL_GPL(twl4030_codec_disable_resource);
 148
 149 unsigned int twl4030_codec_get_mclk(void)
 150 {
 151         struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
 152
 153         return codec->audio_mclk;
 154 }
 155 EXPORT_SYMBOL_GPL(twl4030_codec_get_mclk);
 156
 157 static int __devinit twl4030_codec_probe(struct platform_device *pdev)
 158 {
 159         struct twl4030_codec *codec;
 160         struct twl4030_codec_data *pdata = pdev->dev.platform_data;
 161         struct mfd_cell *cell = NULL;
 162         int ret, childs = 0;
 163         u8 val;
 164
 165         if (!pdata) {
 166                 dev_err(&pdev->dev, "Platform data is missing\n");
 167                 return -EINVAL;
 168         }
 169
 170         /* Configure APLL_INFREQ and disable APLL if enabled */
 171         val = 0;
 172         switch (pdata->audio_mclk) {
 173         case 19200000:
 174                 val |= TWL4030_APLL_INFREQ_19200KHZ;
 175                 break;
 176         case 26000000:
 177                 val |= TWL4030_APLL_INFREQ_26000KHZ;
 178                 break;
 179         case 38400000:
 180                 val |= TWL4030_APLL_INFREQ_38400KHZ;
 181                 break;
 182         default:
 183                 dev_err(&pdev->dev, "Invalid audio_mclk\n");
 184                 return -EINVAL;
 185         }
 186         twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
 187                                         val, TWL4030_REG_APLL_CTL);
 188
 189         codec = kzalloc(sizeof(struct twl4030_codec), GFP_KERNEL);
 190         if (!codec)
 191                 return -ENOMEM;
 192
 193         platform_set_drvdata(pdev, codec);
 194
 195         twl4030_codec_dev = pdev;
 196         mutex_init(&codec->mutex);
 197         codec->audio_mclk = pdata->audio_mclk;
 198
 199         /* Codec power */
 200         codec->resource[TWL4030_CODEC_RES_POWER].reg = TWL4030_REG_CODEC_MODE;
 201         codec->resource[TWL4030_CODEC_RES_POWER].mask = TWL4030_CODECPDZ;
 202
 203         /* PLL */
 204         codec->resource[TWL4030_CODEC_RES_APLL].reg = TWL4030_REG_APLL_CTL;
 205         codec->resource[TWL4030_CODEC_RES_APLL].mask = TWL4030_APLL_EN;
 206
 207         if (pdata->audio) {
 208                 cell = &codec->cells[childs];
 209                 cell->name = "twl4030_codec_audio";
 210                 cell->platform_data = pdata->audio;
 211                 cell->data_size = sizeof(*pdata->audio);
 212                 childs++;
 213         }
 214         if (pdata->vibra) {
 215                 cell = &codec->cells[childs];
 216                 cell->name = "twl4030_codec_vibra";
 217                 cell->platform_data = pdata->vibra;
 218                 cell->data_size = sizeof(*pdata->vibra);
 219                 childs++;
 220         }
 221
 222         if (childs)
 223                 ret = mfd_add_devices(&pdev->dev, pdev->id, codec->cells,
 224                                       childs, NULL, 0);
 225         else {
 226                 dev_err(&pdev->dev, "No platform data found for childs\n");
 227                 ret = -ENODEV;
 228         }
 229
 230         if (!ret)
 231                 return 0;
 232
 233         platform_set_drvdata(pdev, NULL);
 234         kfree(codec);
 235         twl4030_codec_dev = NULL;
 236         return ret;
 237 }
 238
 239 static int __devexit twl4030_codec_remove(struct platform_device *pdev)
 240 {
 241         struct twl4030_codec *codec = platform_get_drvdata(pdev);
 242
 243         mfd_remove_devices(&pdev->dev);
 244         platform_set_drvdata(pdev, NULL);
 245         kfree(codec);
 246         twl4030_codec_dev = NULL;
 247
 248         return 0;
 249 }
 250
 251 MODULE_ALIAS("platform:twl4030_codec");
 252
 253 static struct platform_driver twl4030_codec_driver = {
 254         .probe          = twl4030_codec_probe,
 255         .remove         = __devexit_p(twl4030_codec_remove),
 256         .driver         = {
 257                 .owner  = THIS_MODULE,
 258                 .name   = "twl4030_codec",
 259         },
 260 };
 261
 262 static int __devinit twl4030_codec_init(void)
 263 {
 264         return platform_driver_register(&twl4030_codec_driver);
 265 }
 266 module_init(twl4030_codec_init);
 267
 268 static void __devexit twl4030_codec_exit(void)
 269 {
 270         platform_driver_unregister(&twl4030_codec_driver);
 271 }
 272 module_exit(twl4030_codec_exit);
 273
 274 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@nokia.com>");
 275 MODULE_LICENSE("GPL");
 276