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@ti.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 enum tpa_model {
  37         TPA6130A2,
  38         TPA6140A2,
  39 };
  40
  41 static struct i2c_client *tpa6130a2_client;
  42
  43 /* This struct is used to save the context */
  44 struct tpa6130a2_data {
  45         struct mutex mutex;
  46         unsigned char regs[TPA6130A2_CACHEREGNUM];
  47         struct regulator *supply;
  48         int power_gpio;
  49         u8 power_state:1;
  50         enum tpa_model id;
  51 };
  52
  53 static int tpa6130a2_i2c_read(int reg)
  54 {
  55         struct tpa6130a2_data *data;
  56         int val;
  57
  58         BUG_ON(tpa6130a2_client == NULL);
  59         data = i2c_get_clientdata(tpa6130a2_client);
  60
  61         /* If powered off, return the cached value */
  62         if (data->power_state) {
  63                 val = i2c_smbus_read_byte_data(tpa6130a2_client, reg);
  64                 if (val < 0)
  65                         dev_err(&tpa6130a2_client->dev, "Read failed\n");
  66                 else
  67                         data->regs[reg] = val;
  68         } else {
  69                 val = data->regs[reg];
  70         }
  71
  72         return val;
  73 }
  74
  75 static int tpa6130a2_i2c_write(int reg, u8 value)
  76 {
  77         struct tpa6130a2_data *data;
  78         int val = 0;
  79
  80         BUG_ON(tpa6130a2_client == NULL);
  81         data = i2c_get_clientdata(tpa6130a2_client);
  82
  83         if (data->power_state) {
  84                 val = i2c_smbus_write_byte_data(tpa6130a2_client, reg, value);
  85                 if (val < 0) {
  86                         dev_err(&tpa6130a2_client->dev, "Write failed\n");
  87                         return val;
  88                 }
  89         }
  90
  91         /* Either powered on or off, we save the context */
  92         data->regs[reg] = value;
  93
  94         return val;
  95 }
  96
  97 static u8 tpa6130a2_read(int reg)
  98 {
  99         struct tpa6130a2_data *data;
 100
 101         BUG_ON(tpa6130a2_client == NULL);
 102         data = i2c_get_clientdata(tpa6130a2_client);
 103
 104         return data->regs[reg];
 105 }
 106
 107 static int tpa6130a2_initialize(void)
 108 {
 109         struct tpa6130a2_data *data;
 110         int i, ret = 0;
 111
 112         BUG_ON(tpa6130a2_client == NULL);
 113         data = i2c_get_clientdata(tpa6130a2_client);
 114
 115         for (i = 1; i < TPA6130A2_REG_VERSION; i++) {
 116                 ret = tpa6130a2_i2c_write(i, data->regs[i]);
 117                 if (ret < 0)
 118                         break;
 119         }
 120
 121         return ret;
 122 }
 123
 124 static int tpa6130a2_power(u8 power)
 125 {
 126         struct  tpa6130a2_data *data;
 127         u8      val;
 128         int     ret = 0;
 129
 130         BUG_ON(tpa6130a2_client == NULL);
 131         data = i2c_get_clientdata(tpa6130a2_client);
 132
 133         mutex_lock(&data->mutex);
 134         if (power == data->power_state)
 135                 goto exit;
 136
 137         if (power) {
 138                 ret = regulator_enable(data->supply);
 139                 if (ret != 0) {
 140                         dev_err(&tpa6130a2_client->dev,
 141                                 "Failed to enable supply: %d\n", ret);
 142                         goto exit;
 143                 }
 144                 /* Power on */
 145                 if (data->power_gpio >= 0)
 146                         gpio_set_value(data->power_gpio, 1);
 147
 148                 data->power_state = 1;
 149                 ret = tpa6130a2_initialize();
 150                 if (ret < 0) {
 151                         dev_err(&tpa6130a2_client->dev,
 152                                 "Failed to initialize chip\n");
 153                         if (data->power_gpio >= 0)
 154                                 gpio_set_value(data->power_gpio, 0);
 155                         regulator_disable(data->supply);
 156                         data->power_state = 0;
 157                         goto exit;
 158                 }
 159         } else {
 160                 /* set SWS */
 161                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
 162                 val |= TPA6130A2_SWS;
 163                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
 164
 165                 /* Power off */
 166                 if (data->power_gpio >= 0)
 167                         gpio_set_value(data->power_gpio, 0);
 168
 169                 ret = regulator_disable(data->supply);
 170                 if (ret != 0) {
 171                         dev_err(&tpa6130a2_client->dev,
 172                                 "Failed to disable supply: %d\n", ret);
 173                         goto exit;
 174                 }
 175
 176                 data->power_state = 0;
 177         }
 178
 179 exit:
 180         mutex_unlock(&data->mutex);
 181         return ret;
 182 }
 183
 184 static int tpa6130a2_get_volsw(struct snd_kcontrol *kcontrol,
 185                 struct snd_ctl_elem_value *ucontrol)
 186 {
 187         struct soc_mixer_control *mc =
 188                 (struct soc_mixer_control *)kcontrol->private_value;
 189         struct tpa6130a2_data *data;
 190         unsigned int reg = mc->reg;
 191         unsigned int shift = mc->shift;
 192         int max = mc->max;
 193         unsigned int mask = (1 << fls(max)) - 1;
 194         unsigned int invert = mc->invert;
 195
 196         BUG_ON(tpa6130a2_client == NULL);
 197         data = i2c_get_clientdata(tpa6130a2_client);
 198
 199         mutex_lock(&data->mutex);
 200
 201         ucontrol->value.integer.value[0] =
 202                 (tpa6130a2_read(reg) >> shift) & mask;
 203
 204         if (invert)
 205                 ucontrol->value.integer.value[0] =
 206                         max - ucontrol->value.integer.value[0];
 207
 208         mutex_unlock(&data->mutex);
 209         return 0;
 210 }
 211
 212 static int tpa6130a2_put_volsw(struct snd_kcontrol *kcontrol,
 213                 struct snd_ctl_elem_value *ucontrol)
 214 {
 215         struct soc_mixer_control *mc =
 216                 (struct soc_mixer_control *)kcontrol->private_value;
 217         struct tpa6130a2_data *data;
 218         unsigned int reg = mc->reg;
 219         unsigned int shift = mc->shift;
 220         int max = mc->max;
 221         unsigned int mask = (1 << fls(max)) - 1;
 222         unsigned int invert = mc->invert;
 223         unsigned int val = (ucontrol->value.integer.value[0] & mask);
 224         unsigned int val_reg;
 225
 226         BUG_ON(tpa6130a2_client == NULL);
 227         data = i2c_get_clientdata(tpa6130a2_client);
 228
 229         if (invert)
 230                 val = max - val;
 231
 232         mutex_lock(&data->mutex);
 233
 234         val_reg = tpa6130a2_read(reg);
 235         if (((val_reg >> shift) & mask) == val) {
 236                 mutex_unlock(&data->mutex);
 237                 return 0;
 238         }
 239
 240         val_reg &= ~(mask << shift);
 241         val_reg |= val << shift;
 242         tpa6130a2_i2c_write(reg, val_reg);
 243
 244         mutex_unlock(&data->mutex);
 245
 246         return 1;
 247 }
 248
 249 /*
 250  * TPA6130 volume. From -59.5 to 4 dB with increasing step size when going
 251  * down in gain.
 252  */
 253 static const unsigned int tpa6130_tlv[] = {
 254         TLV_DB_RANGE_HEAD(10),
 255         0, 1, TLV_DB_SCALE_ITEM(-5950, 600, 0),
 256         2, 3, TLV_DB_SCALE_ITEM(-5000, 250, 0),
 257         4, 5, TLV_DB_SCALE_ITEM(-4550, 160, 0),
 258         6, 7, TLV_DB_SCALE_ITEM(-4140, 190, 0),
 259         8, 9, TLV_DB_SCALE_ITEM(-3650, 120, 0),
 260         10, 11, TLV_DB_SCALE_ITEM(-3330, 160, 0),
 261         12, 13, TLV_DB_SCALE_ITEM(-3040, 180, 0),
 262         14, 20, TLV_DB_SCALE_ITEM(-2710, 110, 0),
 263         21, 37, TLV_DB_SCALE_ITEM(-1960, 74, 0),
 264         38, 63, TLV_DB_SCALE_ITEM(-720, 45, 0),
 265 };
 266
 267 static const struct snd_kcontrol_new tpa6130a2_controls[] = {
 268         SOC_SINGLE_EXT_TLV("TPA6130A2 Headphone Playback Volume",
 269                        TPA6130A2_REG_VOL_MUTE, 0, 0x3f, 0,
 270                        tpa6130a2_get_volsw, tpa6130a2_put_volsw,
 271                        tpa6130_tlv),
 272 };
 273
 274 static const unsigned int tpa6140_tlv[] = {
 275         TLV_DB_RANGE_HEAD(3),
 276         0, 8, TLV_DB_SCALE_ITEM(-5900, 400, 0),
 277         9, 16, TLV_DB_SCALE_ITEM(-2500, 200, 0),
 278         17, 31, TLV_DB_SCALE_ITEM(-1000, 100, 0),
 279 };
 280
 281 static const struct snd_kcontrol_new tpa6140a2_controls[] = {
 282         SOC_SINGLE_EXT_TLV("TPA6140A2 Headphone Playback Volume",
 283                        TPA6130A2_REG_VOL_MUTE, 1, 0x1f, 0,
 284                        tpa6130a2_get_volsw, tpa6130a2_put_volsw,
 285                        tpa6140_tlv),
 286 };
 287
 288 /*
 289  * Enable or disable channel (left or right)
 290  * The bit number for mute and amplifier are the same per channel:
 291  * bit 6: Right channel
 292  * bit 7: Left channel
 293  * in both registers.
 294  */
 295 static void tpa6130a2_channel_enable(u8 channel, int enable)
 296 {
 297         u8      val;
 298
 299         if (enable) {
 300                 /* Enable channel */
 301                 /* Enable amplifier */
 302                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
 303                 val |= channel;
 304                 val &= ~TPA6130A2_SWS;
 305                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
 306
 307                 /* Unmute channel */
 308                 val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
 309                 val &= ~channel;
 310                 tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
 311         } else {
 312                 /* Disable channel */
 313                 /* Mute channel */
 314                 val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
 315                 val |= channel;
 316                 tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
 317
 318                 /* Disable amplifier */
 319                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
 320                 val &= ~channel;
 321                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
 322         }
 323 }
 324
 325 int tpa6130a2_stereo_enable(struct snd_soc_codec *codec, int enable)
 326 {
 327         int ret = 0;
 328         if (enable) {
 329                 ret = tpa6130a2_power(1);
 330                 if (ret < 0)
 331                         return ret;
 332                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_R | TPA6130A2_HP_EN_L,
 333                                          1);
 334         } else {
 335                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_R | TPA6130A2_HP_EN_L,
 336                                          0);
 337                 ret = tpa6130a2_power(0);
 338         }
 339
 340         return ret;
 341 }
 342 EXPORT_SYMBOL_GPL(tpa6130a2_stereo_enable);
 343
 344 int tpa6130a2_add_controls(struct snd_soc_codec *codec)
 345 {
 346         struct  tpa6130a2_data *data;
 347
 348         if (tpa6130a2_client == NULL)
 349                 return -ENODEV;
 350
 351         data = i2c_get_clientdata(tpa6130a2_client);
 352
 353         if (data->id == TPA6140A2)
 354                 return snd_soc_add_controls(codec, tpa6140a2_controls,
 355                                                 ARRAY_SIZE(tpa6140a2_controls));
 356         else
 357                 return snd_soc_add_controls(codec, tpa6130a2_controls,
 358                                                 ARRAY_SIZE(tpa6130a2_controls));
 359 }
 360 EXPORT_SYMBOL_GPL(tpa6130a2_add_controls);
 361
 362 static int __devinit tpa6130a2_probe(struct i2c_client *client,
 363                                      const struct i2c_device_id *id)
 364 {
 365         struct device *dev;
 366         struct tpa6130a2_data *data;
 367         struct tpa6130a2_platform_data *pdata;
 368         const char *regulator;
 369         int ret;
 370
 371         dev = &client->dev;
 372
 373         if (client->dev.platform_data == NULL) {
 374                 dev_err(dev, "Platform data not set\n");
 375                 dump_stack();
 376                 return -ENODEV;
 377         }
 378
 379         data = kzalloc(sizeof(*data), GFP_KERNEL);
 380         if (data == NULL) {
 381                 dev_err(dev, "Can not allocate memory\n");
 382                 return -ENOMEM;
 383         }
 384
 385         tpa6130a2_client = client;
 386
 387         i2c_set_clientdata(tpa6130a2_client, data);
 388
 389         pdata = client->dev.platform_data;
 390         data->power_gpio = pdata->power_gpio;
 391         data->id = id->driver_data;
 392
 393         mutex_init(&data->mutex);
 394
 395         /* Set default register values */
 396         data->regs[TPA6130A2_REG_CONTROL] =     TPA6130A2_SWS;
 397         data->regs[TPA6130A2_REG_VOL_MUTE] =    TPA6130A2_MUTE_R |
 398                                                 TPA6130A2_MUTE_L;
 399
 400         if (data->power_gpio >= 0) {
 401                 ret = gpio_request(data->power_gpio, "tpa6130a2 enable");
 402                 if (ret < 0) {
 403                         dev_err(dev, "Failed to request power GPIO (%d)\n",
 404                                 data->power_gpio);
 405                         goto err_gpio;
 406                 }
 407                 gpio_direction_output(data->power_gpio, 0);
 408         }
 409
 410         switch (data->id) {
 411         default:
 412                 dev_warn(dev, "Unknown TPA model (%d). Assuming 6130A2\n",
 413                          data->id);
 414         case TPA6130A2:
 415                 regulator = "Vdd";
 416                 break;
 417         case TPA6140A2:
 418                 regulator = "AVdd";
 419                 break;
 420         }
 421
 422         data->supply = regulator_get(dev, regulator);
 423         if (IS_ERR(data->supply)) {
 424                 ret = PTR_ERR(data->supply);
 425                 dev_err(dev, "Failed to request supply: %d\n", ret);
 426                 goto err_regulator;
 427         }
 428
 429         ret = tpa6130a2_power(1);
 430         if (ret != 0)
 431                 goto err_power;
 432
 433
 434         /* Read version */
 435         ret = tpa6130a2_i2c_read(TPA6130A2_REG_VERSION) &
 436                                  TPA6130A2_VERSION_MASK;
 437         if ((ret != 1) && (ret != 2))
 438                 dev_warn(dev, "UNTESTED version detected (%d)\n", ret);
 439
 440         /* Disable the chip */
 441         ret = tpa6130a2_power(0);
 442         if (ret != 0)
 443                 goto err_power;
 444
 445         return 0;
 446
 447 err_power:
 448         regulator_put(data->supply);
 449 err_regulator:
 450         if (data->power_gpio >= 0)
 451                 gpio_free(data->power_gpio);
 452 err_gpio:
 453         kfree(data);
 454         tpa6130a2_client = NULL;
 455
 456         return ret;
 457 }
 458
 459 static int __devexit tpa6130a2_remove(struct i2c_client *client)
 460 {
 461         struct tpa6130a2_data *data = i2c_get_clientdata(client);
 462
 463         tpa6130a2_power(0);
 464
 465         if (data->power_gpio >= 0)
 466                 gpio_free(data->power_gpio);
 467
 468         regulator_put(data->supply);
 469
 470         kfree(data);
 471         tpa6130a2_client = NULL;
 472
 473         return 0;
 474 }
 475
 476 static const struct i2c_device_id tpa6130a2_id[] = {
 477         { "tpa6130a2", TPA6130A2 },
 478         { "tpa6140a2", TPA6140A2 },
 479         { }
 480 };
 481 MODULE_DEVICE_TABLE(i2c, tpa6130a2_id);
 482
 483 static struct i2c_driver tpa6130a2_i2c_driver = {
 484         .driver = {
 485                 .name = "tpa6130a2",
 486                 .owner = THIS_MODULE,
 487         },
 488         .probe = tpa6130a2_probe,
 489         .remove = __devexit_p(tpa6130a2_remove),
 490         .id_table = tpa6130a2_id,
 491 };
 492
 493 static int __init tpa6130a2_init(void)
 494 {
 495         return i2c_add_driver(&tpa6130a2_i2c_driver);
 496 }
 497
 498 static void __exit tpa6130a2_exit(void)
 499 {
 500         i2c_del_driver(&tpa6130a2_i2c_driver);
 501 }
 502
 503 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
 504 MODULE_DESCRIPTION("TPA6130A2 Headphone amplifier driver");
 505 MODULE_LICENSE("GPL");
 506
 507 module_init(tpa6130a2_init);
 508 module_exit(tpa6130a2_exit);