linux/drivers/mfd/twl4030-audio.c
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   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
  37static struct platform_device *twl4030_audio_dev;
  38
  39struct twl4030_audio_resource {
  40        int request_count;
  41        u8 reg;
  42        u8 mask;
  43};
  44
  45struct 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 */
  56static 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
  75static 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 */
  90int 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}
 113EXPORT_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 */
 119int 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}
 149EXPORT_SYMBOL_GPL(twl4030_audio_disable_resource);
 150
 151unsigned 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}
 157EXPORT_SYMBOL_GPL(twl4030_audio_get_mclk);
 158
 159static 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, NULL);
 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
 241static 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
 253MODULE_ALIAS("platform:twl4030-audio");
 254
 255static 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
 264module_platform_driver(twl4030_audio_driver);
 265
 266MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
 267MODULE_LICENSE("GPL");
 268
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