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/of.h>
  32 #include <linux/of_platform.h>
  33 #include <linux/i2c/twl.h>
  34 #include <linux/mfd/core.h>
  35 #include <linux/mfd/twl4030-audio.h>
  36
  37 #define TWL4030_AUDIO_CELLS     2
  38
  39 static struct platform_device *twl4030_audio_dev;
  40
  41 struct twl4030_audio_resource {
  42         int request_count;
  43         u8 reg;
  44         u8 mask;
  45 };
  46
  47 struct twl4030_audio {
  48         unsigned int audio_mclk;
  49         struct mutex mutex;
  50         struct twl4030_audio_resource resource[TWL4030_AUDIO_RES_MAX];
  51         struct mfd_cell cells[TWL4030_AUDIO_CELLS];
  52 };
  53
  54 /*
  55  * Modify the resource, the function returns the content of the register
  56  * after the modification.
  57  */
  58 static int twl4030_audio_set_resource(enum twl4030_audio_res id, int enable)
  59 {
  60         struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
  61         u8 val;
  62
  63         twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
  64                         audio->resource[id].reg);
  65
  66         if (enable)
  67                 val |= audio->resource[id].mask;
  68         else
  69                 val &= ~audio->resource[id].mask;
  70
  71         twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
  72                                         val, audio->resource[id].reg);
  73
  74         return val;
  75 }
  76
  77 static inline int twl4030_audio_get_resource(enum twl4030_audio_res id)
  78 {
  79         struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
  80         u8 val;
  81
  82         twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
  83                         audio->resource[id].reg);
  84
  85         return val;
  86 }
  87
  88 /*
  89  * Enable the resource.
  90  * The function returns with error or the content of the register
  91  */
  92 int twl4030_audio_enable_resource(enum twl4030_audio_res id)
  93 {
  94         struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
  95         int val;
  96
  97         if (id >= TWL4030_AUDIO_RES_MAX) {
  98                 dev_err(&twl4030_audio_dev->dev,
  99                                 "Invalid resource ID (%u)\n", id);
 100                 return -EINVAL;
 101         }
 102
 103         mutex_lock(&audio->mutex);
 104         if (!audio->resource[id].request_count)
 105                 /* Resource was disabled, enable it */
 106                 val = twl4030_audio_set_resource(id, 1);
 107         else
 108                 val = twl4030_audio_get_resource(id);
 109
 110         audio->resource[id].request_count++;
 111         mutex_unlock(&audio->mutex);
 112
 113         return val;
 114 }
 115 EXPORT_SYMBOL_GPL(twl4030_audio_enable_resource);
 116
 117 /*
 118  * Disable the resource.
 119  * The function returns with error or the content of the register
 120  */
 121 int twl4030_audio_disable_resource(enum twl4030_audio_res id)
 122 {
 123         struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
 124         int val;
 125
 126         if (id >= TWL4030_AUDIO_RES_MAX) {
 127                 dev_err(&twl4030_audio_dev->dev,
 128                                 "Invalid resource ID (%u)\n", id);
 129                 return -EINVAL;
 130         }
 131
 132         mutex_lock(&audio->mutex);
 133         if (!audio->resource[id].request_count) {
 134                 dev_err(&twl4030_audio_dev->dev,
 135                         "Resource has been disabled already (%u)\n", id);
 136                 mutex_unlock(&audio->mutex);
 137                 return -EPERM;
 138         }
 139         audio->resource[id].request_count--;
 140
 141         if (!audio->resource[id].request_count)
 142                 /* Resource can be disabled now */
 143                 val = twl4030_audio_set_resource(id, 0);
 144         else
 145                 val = twl4030_audio_get_resource(id);
 146
 147         mutex_unlock(&audio->mutex);
 148
 149         return val;
 150 }
 151 EXPORT_SYMBOL_GPL(twl4030_audio_disable_resource);
 152
 153 unsigned int twl4030_audio_get_mclk(void)
 154 {
 155         struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
 156
 157         return audio->audio_mclk;
 158 }
 159 EXPORT_SYMBOL_GPL(twl4030_audio_get_mclk);
 160
 161 static bool twl4030_audio_has_codec(struct twl4030_audio_data *pdata,
 162                               struct device_node *node)
 163 {
 164         if (pdata && pdata->codec)
 165                 return true;
 166
 167         if (of_find_node_by_name(node, "codec"))
 168                 return true;
 169
 170         return false;
 171 }
 172
 173 static bool twl4030_audio_has_vibra(struct twl4030_audio_data *pdata,
 174                               struct device_node *node)
 175 {
 176         int vibra;
 177
 178         if (pdata && pdata->vibra)
 179                 return true;
 180
 181         if (!of_property_read_u32(node, "ti,enable-vibra", &vibra) && vibra)
 182                 return true;
 183
 184         return false;
 185 }
 186
 187 static int twl4030_audio_probe(struct platform_device *pdev)
 188 {
 189         struct twl4030_audio *audio;
 190         struct twl4030_audio_data *pdata = pdev->dev.platform_data;
 191         struct device_node *node = pdev->dev.of_node;
 192         struct mfd_cell *cell = NULL;
 193         int ret, childs = 0;
 194         u8 val;
 195
 196         if (!pdata && !node) {
 197                 dev_err(&pdev->dev, "Platform data is missing\n");
 198                 return -EINVAL;
 199         }
 200
 201         audio = devm_kzalloc(&pdev->dev, sizeof(struct twl4030_audio),
 202                              GFP_KERNEL);
 203         if (!audio)
 204                 return -ENOMEM;
 205
 206         mutex_init(&audio->mutex);
 207         audio->audio_mclk = twl_get_hfclk_rate();
 208
 209         /* Configure APLL_INFREQ and disable APLL if enabled */
 210         switch (audio->audio_mclk) {
 211         case 19200000:
 212                 val = TWL4030_APLL_INFREQ_19200KHZ;
 213                 break;
 214         case 26000000:
 215                 val = TWL4030_APLL_INFREQ_26000KHZ;
 216                 break;
 217         case 38400000:
 218                 val = TWL4030_APLL_INFREQ_38400KHZ;
 219                 break;
 220         default:
 221                 dev_err(&pdev->dev, "Invalid audio_mclk\n");
 222                 return -EINVAL;
 223         }
 224         twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, val, TWL4030_REG_APLL_CTL);
 225
 226         /* Codec power */
 227         audio->resource[TWL4030_AUDIO_RES_POWER].reg = TWL4030_REG_CODEC_MODE;
 228         audio->resource[TWL4030_AUDIO_RES_POWER].mask = TWL4030_CODECPDZ;
 229
 230         /* PLL */
 231         audio->resource[TWL4030_AUDIO_RES_APLL].reg = TWL4030_REG_APLL_CTL;
 232         audio->resource[TWL4030_AUDIO_RES_APLL].mask = TWL4030_APLL_EN;
 233
 234         if (twl4030_audio_has_codec(pdata, node)) {
 235                 cell = &audio->cells[childs];
 236                 cell->name = "twl4030-codec";
 237                 if (pdata) {
 238                         cell->platform_data = pdata->codec;
 239                         cell->pdata_size = sizeof(*pdata->codec);
 240                 }
 241                 childs++;
 242         }
 243         if (twl4030_audio_has_vibra(pdata, node)) {
 244                 cell = &audio->cells[childs];
 245                 cell->name = "twl4030-vibra";
 246                 if (pdata) {
 247                         cell->platform_data = pdata->vibra;
 248                         cell->pdata_size = sizeof(*pdata->vibra);
 249                 }
 250                 childs++;
 251         }
 252
 253         platform_set_drvdata(pdev, audio);
 254         twl4030_audio_dev = pdev;
 255
 256         if (childs)
 257                 ret = mfd_add_devices(&pdev->dev, pdev->id, audio->cells,
 258                                       childs, NULL, 0, NULL);
 259         else {
 260                 dev_err(&pdev->dev, "No platform data found for childs\n");
 261                 ret = -ENODEV;
 262         }
 263
 264         if (ret)
 265                 twl4030_audio_dev = NULL;
 266
 267         return ret;
 268 }
 269
 270 static int twl4030_audio_remove(struct platform_device *pdev)
 271 {
 272         mfd_remove_devices(&pdev->dev);
 273         twl4030_audio_dev = NULL;
 274
 275         return 0;
 276 }
 277
 278 static const struct of_device_id twl4030_audio_of_match[] = {
 279         {.compatible = "ti,twl4030-audio", },
 280         { },
 281 };
 282 MODULE_DEVICE_TABLE(of, twl4030_audio_of_match);
 283
 284 static struct platform_driver twl4030_audio_driver = {
 285         .driver         = {
 286                 .owner  = THIS_MODULE,
 287                 .name   = "twl4030-audio",
 288                 .of_match_table = twl4030_audio_of_match,
 289         },
 290         .probe          = twl4030_audio_probe,
 291         .remove         = twl4030_audio_remove,
 292 };
 293
 294 module_platform_driver(twl4030_audio_driver);
 295
 296 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
 297 MODULE_DESCRIPTION("TWL4030 audio block MFD driver");
 298 MODULE_LICENSE("GPL");
 299 MODULE_ALIAS("platform:twl4030-audio");