sound/soc/codecs/tpa6130a2.c

   1 /*
   2  * ALSA SoC Texas Instruments TPA6130A2 headset stereo amplifier driver
   3  *
   4  * Copyright (C) Nokia Corporation
   5  *
   6  * Author: Peter Ujfalusi <peter.ujfalusi@nokia.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as 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 #include <linux/module.h>
  24 #include <linux/errno.h>
  25 #include <linux/device.h>
  26 #include <linux/i2c.h>
  27 #include <linux/gpio.h>
  28 #include <linux/regulator/consumer.h>
  29 #include <linux/slab.h>
  30 #include <sound/tpa6130a2-plat.h>
  31 #include <sound/soc.h>
  32 #include <sound/tlv.h>
  33
  34 #include "tpa6130a2.h"
  35
  36 static struct i2c_client *tpa6130a2_client;
  37
  38 /* This struct is used to save the context */
  39 struct tpa6130a2_data {
  40         struct mutex mutex;
  41         unsigned char regs[TPA6130A2_CACHEREGNUM];
  42         struct regulator *supply;
  43         int power_gpio;
  44         u8 power_state:1;
  45         enum tpa_model id;
  46 };
  47
  48 static int tpa6130a2_i2c_read(int reg)
  49 {
  50         struct tpa6130a2_data *data;
  51         int val;
  52
  53         BUG_ON(tpa6130a2_client == NULL);
  54         data = i2c_get_clientdata(tpa6130a2_client);
  55
  56         /* If powered off, return the cached value */
  57         if (data->power_state) {
  58                 val = i2c_smbus_read_byte_data(tpa6130a2_client, reg);
  59                 if (val < 0)
  60                         dev_err(&tpa6130a2_client->dev, "Read failed\n");
  61                 else
  62                         data->regs[reg] = val;
  63         } else {
  64                 val = data->regs[reg];
  65         }
  66
  67         return val;
  68 }
  69
  70 static int tpa6130a2_i2c_write(int reg, u8 value)
  71 {
  72         struct tpa6130a2_data *data;
  73         int val = 0;
  74
  75         BUG_ON(tpa6130a2_client == NULL);
  76         data = i2c_get_clientdata(tpa6130a2_client);
  77
  78         if (data->power_state) {
  79                 val = i2c_smbus_write_byte_data(tpa6130a2_client, reg, value);
  80                 if (val < 0) {
  81                         dev_err(&tpa6130a2_client->dev, "Write failed\n");
  82                         return val;
  83                 }
  84         }
  85
  86         /* Either powered on or off, we save the context */
  87         data->regs[reg] = value;
  88
  89         return val;
  90 }
  91
  92 static u8 tpa6130a2_read(int reg)
  93 {
  94         struct tpa6130a2_data *data;
  95
  96         BUG_ON(tpa6130a2_client == NULL);
  97         data = i2c_get_clientdata(tpa6130a2_client);
  98
  99         return data->regs[reg];
 100 }
 101
 102 static int tpa6130a2_initialize(void)
 103 {
 104         struct tpa6130a2_data *data;
 105         int i, ret = 0;
 106
 107         BUG_ON(tpa6130a2_client == NULL);
 108         data = i2c_get_clientdata(tpa6130a2_client);
 109
 110         for (i = 1; i < TPA6130A2_REG_VERSION; i++) {
 111                 ret = tpa6130a2_i2c_write(i, data->regs[i]);
 112                 if (ret < 0)
 113                         break;
 114         }
 115
 116         return ret;
 117 }
 118
 119 static int tpa6130a2_power(u8 power)
 120 {
 121         struct  tpa6130a2_data *data;
 122         u8      val;
 123         int     ret = 0;
 124
 125         BUG_ON(tpa6130a2_client == NULL);
 126         data = i2c_get_clientdata(tpa6130a2_client);
 127
 128         mutex_lock(&data->mutex);
 129         if (power == data->power_state)
 130                 goto exit;
 131
 132         if (power) {
 133                 ret = regulator_enable(data->supply);
 134                 if (ret != 0) {
 135                         dev_err(&tpa6130a2_client->dev,
 136                                 "Failed to enable supply: %d\n", ret);
 137                         goto exit;
 138                 }
 139                 /* Power on */
 140                 if (data->power_gpio >= 0)
 141                         gpio_set_value(data->power_gpio, 1);
 142
 143                 data->power_state = 1;
 144                 ret = tpa6130a2_initialize();
 145                 if (ret < 0) {
 146                         dev_err(&tpa6130a2_client->dev,
 147                                 "Failed to initialize chip\n");
 148                         if (data->power_gpio >= 0)
 149                                 gpio_set_value(data->power_gpio, 0);
 150                         regulator_disable(data->supply);
 151                         data->power_state = 0;
 152                         goto exit;
 153                 }
 154         } else {
 155                 /* set SWS */
 156                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
 157                 val |= TPA6130A2_SWS;
 158                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
 159
 160                 /* Power off */
 161                 if (data->power_gpio >= 0)
 162                         gpio_set_value(data->power_gpio, 0);
 163
 164                 ret = regulator_disable(data->supply);
 165                 if (ret != 0) {
 166                         dev_err(&tpa6130a2_client->dev,
 167                                 "Failed to disable supply: %d\n", ret);
 168                         goto exit;
 169                 }
 170
 171                 data->power_state = 0;
 172         }
 173
 174 exit:
 175         mutex_unlock(&data->mutex);
 176         return ret;
 177 }
 178
 179 static int tpa6130a2_get_volsw(struct snd_kcontrol *kcontrol,
 180                 struct snd_ctl_elem_value *ucontrol)
 181 {
 182         struct soc_mixer_control *mc =
 183                 (struct soc_mixer_control *)kcontrol->private_value;
 184         struct tpa6130a2_data *data;
 185         unsigned int reg = mc->reg;
 186         unsigned int shift = mc->shift;
 187         int max = mc->max;
 188         unsigned int mask = (1 << fls(max)) - 1;
 189         unsigned int invert = mc->invert;
 190
 191         BUG_ON(tpa6130a2_client == NULL);
 192         data = i2c_get_clientdata(tpa6130a2_client);
 193
 194         mutex_lock(&data->mutex);
 195
 196         ucontrol->value.integer.value[0] =
 197                 (tpa6130a2_read(reg) >> shift) & mask;
 198
 199         if (invert)
 200                 ucontrol->value.integer.value[0] =
 201                         max - ucontrol->value.integer.value[0];
 202
 203         mutex_unlock(&data->mutex);
 204         return 0;
 205 }
 206
 207 static int tpa6130a2_put_volsw(struct snd_kcontrol *kcontrol,
 208                 struct snd_ctl_elem_value *ucontrol)
 209 {
 210         struct soc_mixer_control *mc =
 211                 (struct soc_mixer_control *)kcontrol->private_value;
 212         struct tpa6130a2_data *data;
 213         unsigned int reg = mc->reg;
 214         unsigned int shift = mc->shift;
 215         int max = mc->max;
 216         unsigned int mask = (1 << fls(max)) - 1;
 217         unsigned int invert = mc->invert;
 218         unsigned int val = (ucontrol->value.integer.value[0] & mask);
 219         unsigned int val_reg;
 220
 221         BUG_ON(tpa6130a2_client == NULL);
 222         data = i2c_get_clientdata(tpa6130a2_client);
 223
 224         if (invert)
 225                 val = max - val;
 226
 227         mutex_lock(&data->mutex);
 228
 229         val_reg = tpa6130a2_read(reg);
 230         if (((val_reg >> shift) & mask) == val) {
 231                 mutex_unlock(&data->mutex);
 232                 return 0;
 233         }
 234
 235         val_reg &= ~(mask << shift);
 236         val_reg |= val << shift;
 237         tpa6130a2_i2c_write(reg, val_reg);
 238
 239         mutex_unlock(&data->mutex);
 240
 241         return 1;
 242 }
 243
 244 /*
 245  * TPA6130 volume. From -59.5 to 4 dB with increasing step size when going
 246  * down in gain.
 247  */
 248 static const unsigned int tpa6130_tlv[] = {
 249         TLV_DB_RANGE_HEAD(10),
 250         0, 1, TLV_DB_SCALE_ITEM(-5950, 600, 0),
 251         2, 3, TLV_DB_SCALE_ITEM(-5000, 250, 0),
 252         4, 5, TLV_DB_SCALE_ITEM(-4550, 160, 0),
 253         6, 7, TLV_DB_SCALE_ITEM(-4140, 190, 0),
 254         8, 9, TLV_DB_SCALE_ITEM(-3650, 120, 0),
 255         10, 11, TLV_DB_SCALE_ITEM(-3330, 160, 0),
 256         12, 13, TLV_DB_SCALE_ITEM(-3040, 180, 0),
 257         14, 20, TLV_DB_SCALE_ITEM(-2710, 110, 0),
 258         21, 37, TLV_DB_SCALE_ITEM(-1960, 74, 0),
 259         38, 63, TLV_DB_SCALE_ITEM(-720, 45, 0),
 260 };
 261
 262 static const struct snd_kcontrol_new tpa6130a2_controls[] = {
 263         SOC_SINGLE_EXT_TLV("TPA6130A2 Headphone Playback Volume",
 264                        TPA6130A2_REG_VOL_MUTE, 0, 0x3f, 0,
 265                        tpa6130a2_get_volsw, tpa6130a2_put_volsw,
 266                        tpa6130_tlv),
 267 };
 268
 269 static const unsigned int tpa6140_tlv[] = {
 270         TLV_DB_RANGE_HEAD(3),
 271         0, 8, TLV_DB_SCALE_ITEM(-5900, 400, 0),
 272         9, 16, TLV_DB_SCALE_ITEM(-2500, 200, 0),
 273         17, 31, TLV_DB_SCALE_ITEM(-1000, 100, 0),
 274 };
 275
 276 static const struct snd_kcontrol_new tpa6140a2_controls[] = {
 277         SOC_SINGLE_EXT_TLV("TPA6140A2 Headphone Playback Volume",
 278                        TPA6130A2_REG_VOL_MUTE, 1, 0x1f, 0,
 279                        tpa6130a2_get_volsw, tpa6130a2_put_volsw,
 280                        tpa6140_tlv),
 281 };
 282
 283 /*
 284  * Enable or disable channel (left or right)
 285  * The bit number for mute and amplifier are the same per channel:
 286  * bit 6: Right channel
 287  * bit 7: Left channel
 288  * in both registers.
 289  */
 290 static void tpa6130a2_channel_enable(u8 channel, int enable)
 291 {
 292         u8      val;
 293
 294         if (enable) {
 295                 /* Enable channel */
 296                 /* Enable amplifier */
 297                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
 298                 val |= channel;
 299                 val &= ~TPA6130A2_SWS;
 300                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
 301
 302                 /* Unmute channel */
 303                 val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
 304                 val &= ~channel;
 305                 tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
 306         } else {
 307                 /* Disable channel */
 308                 /* Mute channel */
 309                 val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
 310                 val |= channel;
 311                 tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
 312
 313                 /* Disable amplifier */
 314                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
 315                 val &= ~channel;
 316                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
 317         }
 318 }
 319
 320 int tpa6130a2_stereo_enable(struct snd_soc_codec *codec, int enable)
 321 {
 322         int ret = 0;
 323         if (enable) {
 324                 ret = tpa6130a2_power(1);
 325                 if (ret < 0)
 326                         return ret;
 327                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_R | TPA6130A2_HP_EN_L,
 328                                          1);
 329         } else {
 330                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_R | TPA6130A2_HP_EN_L,
 331                                          0);
 332                 ret = tpa6130a2_power(0);
 333         }
 334
 335         return ret;
 336 }
 337 EXPORT_SYMBOL_GPL(tpa6130a2_stereo_enable);
 338
 339 int tpa6130a2_add_controls(struct snd_soc_codec *codec)
 340 {
 341         struct  tpa6130a2_data *data;
 342
 343         if (tpa6130a2_client == NULL)
 344                 return -ENODEV;
 345
 346         data = i2c_get_clientdata(tpa6130a2_client);
 347
 348         if (data->id == TPA6140A2)
 349                 return snd_soc_add_controls(codec, tpa6140a2_controls,
 350                                                 ARRAY_SIZE(tpa6140a2_controls));
 351         else
 352                 return snd_soc_add_controls(codec, tpa6130a2_controls,
 353                                                 ARRAY_SIZE(tpa6130a2_controls));
 354 }
 355 EXPORT_SYMBOL_GPL(tpa6130a2_add_controls);
 356
 357 static int __devinit tpa6130a2_probe(struct i2c_client *client,
 358                                      const struct i2c_device_id *id)
 359 {
 360         struct device *dev;
 361         struct tpa6130a2_data *data;
 362         struct tpa6130a2_platform_data *pdata;
 363         const char *regulator;
 364         int ret;
 365
 366         dev = &client->dev;
 367
 368         if (client->dev.platform_data == NULL) {
 369                 dev_err(dev, "Platform data not set\n");
 370                 dump_stack();
 371                 return -ENODEV;
 372         }
 373
 374         data = kzalloc(sizeof(*data), GFP_KERNEL);
 375         if (data == NULL) {
 376                 dev_err(dev, "Can not allocate memory\n");
 377                 return -ENOMEM;
 378         }
 379
 380         tpa6130a2_client = client;
 381
 382         i2c_set_clientdata(tpa6130a2_client, data);
 383
 384         pdata = client->dev.platform_data;
 385         data->power_gpio = pdata->power_gpio;
 386         data->id = pdata->id;
 387
 388         mutex_init(&data->mutex);
 389
 390         /* Set default register values */
 391         data->regs[TPA6130A2_REG_CONTROL] =     TPA6130A2_SWS;
 392         data->regs[TPA6130A2_REG_VOL_MUTE] =    TPA6130A2_MUTE_R |
 393                                                 TPA6130A2_MUTE_L;
 394
 395         if (data->power_gpio >= 0) {
 396                 ret = gpio_request(data->power_gpio, "tpa6130a2 enable");
 397                 if (ret < 0) {
 398                         dev_err(dev, "Failed to request power GPIO (%d)\n",
 399                                 data->power_gpio);
 400                         goto err_gpio;
 401                 }
 402                 gpio_direction_output(data->power_gpio, 0);
 403         }
 404
 405         switch (data->id) {
 406         default:
 407                 dev_warn(dev, "Unknown TPA model (%d). Assuming 6130A2\n",
 408                          pdata->id);
 409         case TPA6130A2:
 410                 regulator = "Vdd";
 411                 break;
 412         case TPA6140A2:
 413                 regulator = "AVdd";
 414                 break;
 415         }
 416
 417         data->supply = regulator_get(dev, regulator);
 418         if (IS_ERR(data->supply)) {
 419                 ret = PTR_ERR(data->supply);
 420                 dev_err(dev, "Failed to request supply: %d\n", ret);
 421                 goto err_regulator;
 422         }
 423
 424         ret = tpa6130a2_power(1);
 425         if (ret != 0)
 426                 goto err_power;
 427
 428
 429         /* Read version */
 430         ret = tpa6130a2_i2c_read(TPA6130A2_REG_VERSION) &
 431                                  TPA6130A2_VERSION_MASK;
 432         if ((ret != 1) && (ret != 2))
 433                 dev_warn(dev, "UNTESTED version detected (%d)\n", ret);
 434
 435         /* Disable the chip */
 436         ret = tpa6130a2_power(0);
 437         if (ret != 0)
 438                 goto err_power;
 439
 440         return 0;
 441
 442 err_power:
 443         regulator_put(data->supply);
 444 err_regulator:
 445         if (data->power_gpio >= 0)
 446                 gpio_free(data->power_gpio);
 447 err_gpio:
 448         kfree(data);
 449         i2c_set_clientdata(tpa6130a2_client, NULL);
 450         tpa6130a2_client = NULL;
 451
 452         return ret;
 453 }
 454
 455 static int __devexit tpa6130a2_remove(struct i2c_client *client)
 456 {
 457         struct tpa6130a2_data *data = i2c_get_clientdata(client);
 458
 459         tpa6130a2_power(0);
 460
 461         if (data->power_gpio >= 0)
 462                 gpio_free(data->power_gpio);
 463
 464         regulator_put(data->supply);
 465
 466         kfree(data);
 467         tpa6130a2_client = NULL;
 468
 469         return 0;
 470 }
 471
 472 static const struct i2c_device_id tpa6130a2_id[] = {
 473         { "tpa6130a2", 0 },
 474         { }
 475 };
 476 MODULE_DEVICE_TABLE(i2c, tpa6130a2_id);
 477
 478 static struct i2c_driver tpa6130a2_i2c_driver = {
 479         .driver = {
 480                 .name = "tpa6130a2",
 481                 .owner = THIS_MODULE,
 482         },
 483         .probe = tpa6130a2_probe,
 484         .remove = __devexit_p(tpa6130a2_remove),
 485         .id_table = tpa6130a2_id,
 486 };
 487
 488 static int __init tpa6130a2_init(void)
 489 {
 490         return i2c_add_driver(&tpa6130a2_i2c_driver);
 491 }
 492
 493 static void __exit tpa6130a2_exit(void)
 494 {
 495         i2c_del_driver(&tpa6130a2_i2c_driver);
 496 }
 497
 498 MODULE_AUTHOR("Peter Ujfalusi");
 499 MODULE_DESCRIPTION("TPA6130A2 Headphone amplifier driver");
 500 MODULE_LICENSE("GPL");
 501
 502 module_init(tpa6130a2_init);
 503 module_exit(tpa6130a2_exit);