drivers/mfd/twl4030-audio.c

   1 /*
   2  * MFD driver for twl4030 audio submodule, which contains an audio codec, and
   3  * the vibra control.
   4  *
   5  * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
   6  *
   7  * Copyright:   (C) 2009 Nokia Corporation
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  21  * 02110-1301 USA
  22  *
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/types.h>
  27 #include <linux/slab.h>
  28 #include <linux/kernel.h>
  29 #include <linux/fs.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/i2c/twl.h>
  32 #include <linux/mfd/core.h>
  33 #include <linux/mfd/twl4030-audio.h>
  34
  35 #define TWL4030_AUDIO_CELLS     2
  36
  37 static struct platform_device *twl4030_audio_dev;
  38
  39 struct twl4030_audio_resource {
  40         int request_count;
  41         u8 reg;
  42         u8 mask;
  43 };
  44
  45 struct twl4030_audio {
  46         unsigned int audio_mclk;
  47         struct mutex mutex;
  48         struct twl4030_audio_resource resource[TWL4030_AUDIO_RES_MAX];
  49         struct mfd_cell cells[TWL4030_AUDIO_CELLS];
  50 };
  51
  52 /*
  53  * Modify the resource, the function returns the content of the register
  54  * after the modification.
  55  */
  56 static int twl4030_audio_set_resource(enum twl4030_audio_res id, int enable)
  57 {
  58         struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
  59         u8 val;
  60
  61         twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
  62                         audio->resource[id].reg);
  63
  64         if (enable)
  65                 val |= audio->resource[id].mask;
  66         else
  67                 val &= ~audio->resource[id].mask;
  68
  69         twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
  70                                         val, audio->resource[id].reg);
  71
  72         return val;
  73 }
  74
  75 static inline int twl4030_audio_get_resource(enum twl4030_audio_res id)
  76 {
  77         struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
  78         u8 val;
  79
  80         twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
  81                         audio->resource[id].reg);
  82
  83         return val;
  84 }
  85
  86 /*
  87  * Enable the resource.
  88  * The function returns with error or the content of the register
  89  */
  90 int twl4030_audio_enable_resource(enum twl4030_audio_res id)
  91 {
  92         struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
  93         int val;
  94
  95         if (id >= TWL4030_AUDIO_RES_MAX) {
  96                 dev_err(&twl4030_audio_dev->dev,
  97                                 "Invalid resource ID (%u)\n", id);
  98                 return -EINVAL;
  99         }
 100
 101         mutex_lock(&audio->mutex);
 102         if (!audio->resource[id].request_count)
 103                 /* Resource was disabled, enable it */
 104                 val = twl4030_audio_set_resource(id, 1);
 105         else
 106                 val = twl4030_audio_get_resource(id);
 107
 108         audio->resource[id].request_count++;
 109         mutex_unlock(&audio->mutex);
 110
 111         return val;
 112 }
 113 EXPORT_SYMBOL_GPL(twl4030_audio_enable_resource);
 114
 115 /*
 116  * Disable the resource.
 117  * The function returns with error or the content of the register
 118  */
 119 int twl4030_audio_disable_resource(unsigned id)
 120 {
 121         struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
 122         int val;
 123
 124         if (id >= TWL4030_AUDIO_RES_MAX) {
 125                 dev_err(&twl4030_audio_dev->dev,
 126                                 "Invalid resource ID (%u)\n", id);
 127                 return -EINVAL;
 128         }
 129
 130         mutex_lock(&audio->mutex);
 131         if (!audio->resource[id].request_count) {
 132                 dev_err(&twl4030_audio_dev->dev,
 133                         "Resource has been disabled already (%u)\n", id);
 134                 mutex_unlock(&audio->mutex);
 135                 return -EPERM;
 136         }
 137         audio->resource[id].request_count--;
 138
 139         if (!audio->resource[id].request_count)
 140                 /* Resource can be disabled now */
 141                 val = twl4030_audio_set_resource(id, 0);
 142         else
 143                 val = twl4030_audio_get_resource(id);
 144
 145         mutex_unlock(&audio->mutex);
 146
 147         return val;
 148 }
 149 EXPORT_SYMBOL_GPL(twl4030_audio_disable_resource);
 150
 151 unsigned int twl4030_audio_get_mclk(void)
 152 {
 153         struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
 154
 155         return audio->audio_mclk;
 156 }
 157 EXPORT_SYMBOL_GPL(twl4030_audio_get_mclk);
 158
 159 static int __devinit twl4030_audio_probe(struct platform_device *pdev)
 160 {
 161         struct twl4030_audio *audio;
 162         struct twl4030_audio_data *pdata = pdev->dev.platform_data;
 163         struct mfd_cell *cell = NULL;
 164         int ret, childs = 0;
 165         u8 val;
 166
 167         if (!pdata) {
 168                 dev_err(&pdev->dev, "Platform data is missing\n");
 169                 return -EINVAL;
 170         }
 171
 172         /* Configure APLL_INFREQ and disable APLL if enabled */
 173         val = 0;
 174         switch (pdata->audio_mclk) {
 175         case 19200000:
 176                 val |= TWL4030_APLL_INFREQ_19200KHZ;
 177                 break;
 178         case 26000000:
 179                 val |= TWL4030_APLL_INFREQ_26000KHZ;
 180                 break;
 181         case 38400000:
 182                 val |= TWL4030_APLL_INFREQ_38400KHZ;
 183                 break;
 184         default:
 185                 dev_err(&pdev->dev, "Invalid audio_mclk\n");
 186                 return -EINVAL;
 187         }
 188         twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
 189                                         val, TWL4030_REG_APLL_CTL);
 190
 191         audio = kzalloc(sizeof(struct twl4030_audio), GFP_KERNEL);
 192         if (!audio)
 193                 return -ENOMEM;
 194
 195         platform_set_drvdata(pdev, audio);
 196
 197         twl4030_audio_dev = pdev;
 198         mutex_init(&audio->mutex);
 199         audio->audio_mclk = pdata->audio_mclk;
 200
 201         /* Codec power */
 202         audio->resource[TWL4030_AUDIO_RES_POWER].reg = TWL4030_REG_CODEC_MODE;
 203         audio->resource[TWL4030_AUDIO_RES_POWER].mask = TWL4030_CODECPDZ;
 204
 205         /* PLL */
 206         audio->resource[TWL4030_AUDIO_RES_APLL].reg = TWL4030_REG_APLL_CTL;
 207         audio->resource[TWL4030_AUDIO_RES_APLL].mask = TWL4030_APLL_EN;
 208
 209         if (pdata->codec) {
 210                 cell = &audio->cells[childs];
 211                 cell->name = "twl4030-codec";
 212                 cell->platform_data = pdata->codec;
 213                 cell->pdata_size = sizeof(*pdata->codec);
 214                 childs++;
 215         }
 216         if (pdata->vibra) {
 217                 cell = &audio->cells[childs];
 218                 cell->name = "twl4030-vibra";
 219                 cell->platform_data = pdata->vibra;
 220                 cell->pdata_size = sizeof(*pdata->vibra);
 221                 childs++;
 222         }
 223
 224         if (childs)
 225                 ret = mfd_add_devices(&pdev->dev, pdev->id, audio->cells,
 226                                       childs, NULL, 0);
 227         else {
 228                 dev_err(&pdev->dev, "No platform data found for childs\n");
 229                 ret = -ENODEV;
 230         }
 231
 232         if (!ret)
 233                 return 0;
 234
 235         platform_set_drvdata(pdev, NULL);
 236         kfree(audio);
 237         twl4030_audio_dev = NULL;
 238         return ret;
 239 }
 240
 241 static int __devexit twl4030_audio_remove(struct platform_device *pdev)
 242 {
 243         struct twl4030_audio *audio = platform_get_drvdata(pdev);
 244
 245         mfd_remove_devices(&pdev->dev);
 246         platform_set_drvdata(pdev, NULL);
 247         kfree(audio);
 248         twl4030_audio_dev = NULL;
 249
 250         return 0;
 251 }
 252
 253 MODULE_ALIAS("platform:twl4030-audio");
 254
 255 static struct platform_driver twl4030_audio_driver = {
 256         .probe          = twl4030_audio_probe,
 257         .remove         = __devexit_p(twl4030_audio_remove),
 258         .driver         = {
 259                 .owner  = THIS_MODULE,
 260                 .name   = "twl4030-audio",
 261         },
 262 };
 263
 264 static int __devinit twl4030_audio_init(void)
 265 {
 266         return platform_driver_register(&twl4030_audio_driver);
 267 }
 268 module_init(twl4030_audio_init);
 269
 270 static void __devexit twl4030_audio_exit(void)
 271 {
 272         platform_driver_unregister(&twl4030_audio_driver);
 273 }
 274 module_exit(twl4030_audio_exit);
 275
 276 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
 277 MODULE_LICENSE("GPL");