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 <sound/tpa6130a2-plat.h>
  30 #include <sound/soc.h>
  31 #include <sound/soc-dapm.h>
  32 #include <sound/tlv.h>
  33
  34 #include "tpa6130a2.h"
  35
  36 static struct i2c_client *tpa6130a2_client;
  37
  38 #define TPA6130A2_NUM_SUPPLIES 2
  39 static const char *tpa6130a2_supply_names[TPA6130A2_NUM_SUPPLIES] = {
  40         "CPVSS",
  41         "Vdd",
  42 };
  43
  44 static const char *tpa6140a2_supply_names[TPA6130A2_NUM_SUPPLIES] = {
  45         "HPVdd",
  46         "AVdd",
  47 };
  48
  49 /* This struct is used to save the context */
  50 struct tpa6130a2_data {
  51         struct mutex mutex;
  52         unsigned char regs[TPA6130A2_CACHEREGNUM];
  53         struct regulator_bulk_data supplies[TPA6130A2_NUM_SUPPLIES];
  54         int power_gpio;
  55         unsigned char power_state;
  56 };
  57
  58 static int tpa6130a2_i2c_read(int reg)
  59 {
  60         struct tpa6130a2_data *data;
  61         int val;
  62
  63         BUG_ON(tpa6130a2_client == NULL);
  64         data = i2c_get_clientdata(tpa6130a2_client);
  65
  66         /* If powered off, return the cached value */
  67         if (data->power_state) {
  68                 val = i2c_smbus_read_byte_data(tpa6130a2_client, reg);
  69                 if (val < 0)
  70                         dev_err(&tpa6130a2_client->dev, "Read failed\n");
  71                 else
  72                         data->regs[reg] = val;
  73         } else {
  74                 val = data->regs[reg];
  75         }
  76
  77         return val;
  78 }
  79
  80 static int tpa6130a2_i2c_write(int reg, u8 value)
  81 {
  82         struct tpa6130a2_data *data;
  83         int val = 0;
  84
  85         BUG_ON(tpa6130a2_client == NULL);
  86         data = i2c_get_clientdata(tpa6130a2_client);
  87
  88         if (data->power_state) {
  89                 val = i2c_smbus_write_byte_data(tpa6130a2_client, reg, value);
  90                 if (val < 0)
  91                         dev_err(&tpa6130a2_client->dev, "Write failed\n");
  92         }
  93
  94         /* Either powered on or off, we save the context */
  95         data->regs[reg] = value;
  96
  97         return val;
  98 }
  99
 100 static u8 tpa6130a2_read(int reg)
 101 {
 102         struct tpa6130a2_data *data;
 103
 104         BUG_ON(tpa6130a2_client == NULL);
 105         data = i2c_get_clientdata(tpa6130a2_client);
 106
 107         return data->regs[reg];
 108 }
 109
 110 static void tpa6130a2_initialize(void)
 111 {
 112         struct tpa6130a2_data *data;
 113         int i;
 114
 115         BUG_ON(tpa6130a2_client == NULL);
 116         data = i2c_get_clientdata(tpa6130a2_client);
 117
 118         for (i = 1; i < TPA6130A2_REG_VERSION; i++)
 119                 tpa6130a2_i2c_write(i, data->regs[i]);
 120 }
 121
 122 static int tpa6130a2_power(int power)
 123 {
 124         struct  tpa6130a2_data *data;
 125         u8      val;
 126         int     ret;
 127
 128         BUG_ON(tpa6130a2_client == NULL);
 129         data = i2c_get_clientdata(tpa6130a2_client);
 130
 131         mutex_lock(&data->mutex);
 132         if (power) {
 133                 /* Power on */
 134                 if (data->power_gpio >= 0)
 135                         gpio_set_value(data->power_gpio, 1);
 136
 137                 ret = regulator_bulk_enable(ARRAY_SIZE(data->supplies),
 138                                             data->supplies);
 139                 if (ret != 0) {
 140                         dev_err(&tpa6130a2_client->dev,
 141                                 "Failed to enable supplies: %d\n", ret);
 142                         goto exit;
 143                 }
 144
 145                 data->power_state = 1;
 146                 tpa6130a2_initialize();
 147
 148                 /* Clear SWS */
 149                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
 150                 val &= ~TPA6130A2_SWS;
 151                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
 152         } else {
 153                 /* set SWS */
 154                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
 155                 val |= TPA6130A2_SWS;
 156                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
 157
 158                 /* Power off */
 159                 if (data->power_gpio >= 0)
 160                         gpio_set_value(data->power_gpio, 0);
 161
 162                 ret = regulator_bulk_disable(ARRAY_SIZE(data->supplies),
 163                                              data->supplies);
 164                 if (ret != 0) {
 165                         dev_err(&tpa6130a2_client->dev,
 166                                 "Failed to disable supplies: %d\n", ret);
 167                         goto exit;
 168                 }
 169
 170                 data->power_state = 0;
 171         }
 172
 173 exit:
 174         mutex_unlock(&data->mutex);
 175         return ret;
 176 }
 177
 178 static int tpa6130a2_get_reg(struct snd_kcontrol *kcontrol,
 179                 struct snd_ctl_elem_value *ucontrol)
 180 {
 181         struct soc_mixer_control *mc =
 182                 (struct soc_mixer_control *)kcontrol->private_value;
 183         struct tpa6130a2_data *data;
 184         unsigned int reg = mc->reg;
 185         unsigned int shift = mc->shift;
 186         unsigned int mask = mc->max;
 187         unsigned int invert = mc->invert;
 188
 189         BUG_ON(tpa6130a2_client == NULL);
 190         data = i2c_get_clientdata(tpa6130a2_client);
 191
 192         mutex_lock(&data->mutex);
 193
 194         ucontrol->value.integer.value[0] =
 195                 (tpa6130a2_read(reg) >> shift) & mask;
 196
 197         if (invert)
 198                 ucontrol->value.integer.value[0] =
 199                         mask - ucontrol->value.integer.value[0];
 200
 201         mutex_unlock(&data->mutex);
 202         return 0;
 203 }
 204
 205 static int tpa6130a2_set_reg(struct snd_kcontrol *kcontrol,
 206                 struct snd_ctl_elem_value *ucontrol)
 207 {
 208         struct soc_mixer_control *mc =
 209                 (struct soc_mixer_control *)kcontrol->private_value;
 210         struct tpa6130a2_data *data;
 211         unsigned int reg = mc->reg;
 212         unsigned int shift = mc->shift;
 213         unsigned int mask = mc->max;
 214         unsigned int invert = mc->invert;
 215         unsigned int val = (ucontrol->value.integer.value[0] & mask);
 216         unsigned int val_reg;
 217
 218         BUG_ON(tpa6130a2_client == NULL);
 219         data = i2c_get_clientdata(tpa6130a2_client);
 220
 221         if (invert)
 222                 val = mask - val;
 223
 224         mutex_lock(&data->mutex);
 225
 226         val_reg = tpa6130a2_read(reg);
 227         if (((val_reg >> shift) & mask) == val) {
 228                 mutex_unlock(&data->mutex);
 229                 return 0;
 230         }
 231
 232         val_reg &= ~(mask << shift);
 233         val_reg |= val << shift;
 234         tpa6130a2_i2c_write(reg, val_reg);
 235
 236         mutex_unlock(&data->mutex);
 237
 238         return 1;
 239 }
 240
 241 /*
 242  * TPA6130 volume. From -59.5 to 4 dB with increasing step size when going
 243  * down in gain.
 244  */
 245 static const unsigned int tpa6130_tlv[] = {
 246         TLV_DB_RANGE_HEAD(10),
 247         0, 1, TLV_DB_SCALE_ITEM(-5950, 600, 0),
 248         2, 3, TLV_DB_SCALE_ITEM(-5000, 250, 0),
 249         4, 5, TLV_DB_SCALE_ITEM(-4550, 160, 0),
 250         6, 7, TLV_DB_SCALE_ITEM(-4140, 190, 0),
 251         8, 9, TLV_DB_SCALE_ITEM(-3650, 120, 0),
 252         10, 11, TLV_DB_SCALE_ITEM(-3330, 160, 0),
 253         12, 13, TLV_DB_SCALE_ITEM(-3040, 180, 0),
 254         14, 20, TLV_DB_SCALE_ITEM(-2710, 110, 0),
 255         21, 37, TLV_DB_SCALE_ITEM(-1960, 74, 0),
 256         38, 63, TLV_DB_SCALE_ITEM(-720, 45, 0),
 257 };
 258
 259 static const struct snd_kcontrol_new tpa6130a2_controls[] = {
 260         SOC_SINGLE_EXT_TLV("TPA6130A2 Headphone Playback Volume",
 261                        TPA6130A2_REG_VOL_MUTE, 0, 0x3f, 0,
 262                        tpa6130a2_get_reg, tpa6130a2_set_reg,
 263                        tpa6130_tlv),
 264 };
 265
 266 /*
 267  * Enable or disable channel (left or right)
 268  * The bit number for mute and amplifier are the same per channel:
 269  * bit 6: Right channel
 270  * bit 7: Left channel
 271  * in both registers.
 272  */
 273 static void tpa6130a2_channel_enable(u8 channel, int enable)
 274 {
 275         u8      val;
 276
 277         if (enable) {
 278                 /* Enable channel */
 279                 /* Enable amplifier */
 280                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
 281                 val |= channel;
 282                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
 283
 284                 /* Unmute channel */
 285                 val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
 286                 val &= ~channel;
 287                 tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
 288         } else {
 289                 /* Disable channel */
 290                 /* Mute channel */
 291                 val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
 292                 val |= channel;
 293                 tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
 294
 295                 /* Disable amplifier */
 296                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
 297                 val &= ~channel;
 298                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
 299         }
 300 }
 301
 302 static int tpa6130a2_left_event(struct snd_soc_dapm_widget *w,
 303                 struct snd_kcontrol *kcontrol, int event)
 304 {
 305         switch (event) {
 306         case SND_SOC_DAPM_POST_PMU:
 307                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_L, 1);
 308                 break;
 309         case SND_SOC_DAPM_POST_PMD:
 310                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_L, 0);
 311                 break;
 312         }
 313         return 0;
 314 }
 315
 316 static int tpa6130a2_right_event(struct snd_soc_dapm_widget *w,
 317                 struct snd_kcontrol *kcontrol, int event)
 318 {
 319         switch (event) {
 320         case SND_SOC_DAPM_POST_PMU:
 321                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_R, 1);
 322                 break;
 323         case SND_SOC_DAPM_POST_PMD:
 324                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_R, 0);
 325                 break;
 326         }
 327         return 0;
 328 }
 329
 330 static int tpa6130a2_supply_event(struct snd_soc_dapm_widget *w,
 331                 struct snd_kcontrol *kcontrol, int event)
 332 {
 333         int ret = 0;
 334
 335         switch (event) {
 336         case SND_SOC_DAPM_POST_PMU:
 337                 ret = tpa6130a2_power(1);
 338                 break;
 339         case SND_SOC_DAPM_POST_PMD:
 340                 ret = tpa6130a2_power(0);
 341                 break;
 342         }
 343         return ret;
 344 }
 345
 346 static const struct snd_soc_dapm_widget tpa6130a2_dapm_widgets[] = {
 347         SND_SOC_DAPM_PGA_E("TPA6130A2 Left", SND_SOC_NOPM,
 348                         0, 0, NULL, 0, tpa6130a2_left_event,
 349                         SND_SOC_DAPM_POST_PMU|SND_SOC_DAPM_POST_PMD),
 350         SND_SOC_DAPM_PGA_E("TPA6130A2 Right", SND_SOC_NOPM,
 351                         0, 0, NULL, 0, tpa6130a2_right_event,
 352                         SND_SOC_DAPM_POST_PMU|SND_SOC_DAPM_POST_PMD),
 353         SND_SOC_DAPM_SUPPLY("TPA6130A2 Enable", SND_SOC_NOPM,
 354                         0, 0, tpa6130a2_supply_event,
 355                         SND_SOC_DAPM_POST_PMU|SND_SOC_DAPM_POST_PMD),
 356         /* Outputs */
 357         SND_SOC_DAPM_HP("TPA6130A2 Headphone Left", NULL),
 358         SND_SOC_DAPM_HP("TPA6130A2 Headphone Right", NULL),
 359 };
 360
 361 static const struct snd_soc_dapm_route audio_map[] = {
 362         {"TPA6130A2 Headphone Left", NULL, "TPA6130A2 Left"},
 363         {"TPA6130A2 Headphone Right", NULL, "TPA6130A2 Right"},
 364
 365         {"TPA6130A2 Headphone Left", NULL, "TPA6130A2 Enable"},
 366         {"TPA6130A2 Headphone Right", NULL, "TPA6130A2 Enable"},
 367 };
 368
 369 int tpa6130a2_add_controls(struct snd_soc_codec *codec)
 370 {
 371         snd_soc_dapm_new_controls(codec, tpa6130a2_dapm_widgets,
 372                                 ARRAY_SIZE(tpa6130a2_dapm_widgets));
 373
 374         snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
 375
 376         return snd_soc_add_controls(codec, tpa6130a2_controls,
 377                                 ARRAY_SIZE(tpa6130a2_controls));
 378
 379 }
 380 EXPORT_SYMBOL_GPL(tpa6130a2_add_controls);
 381
 382 static int __devinit tpa6130a2_probe(struct i2c_client *client,
 383                                      const struct i2c_device_id *id)
 384 {
 385         struct device *dev;
 386         struct tpa6130a2_data *data;
 387         struct tpa6130a2_platform_data *pdata;
 388         int i, ret;
 389
 390         dev = &client->dev;
 391
 392         if (client->dev.platform_data == NULL) {
 393                 dev_err(dev, "Platform data not set\n");
 394                 dump_stack();
 395                 return -ENODEV;
 396         }
 397
 398         data = kzalloc(sizeof(*data), GFP_KERNEL);
 399         if (data == NULL) {
 400                 dev_err(dev, "Can not allocate memory\n");
 401                 return -ENOMEM;
 402         }
 403
 404         tpa6130a2_client = client;
 405
 406         i2c_set_clientdata(tpa6130a2_client, data);
 407
 408         pdata = client->dev.platform_data;
 409         data->power_gpio = pdata->power_gpio;
 410
 411         mutex_init(&data->mutex);
 412
 413         /* Set default register values */
 414         data->regs[TPA6130A2_REG_CONTROL] =     TPA6130A2_SWS;
 415         data->regs[TPA6130A2_REG_VOL_MUTE] =    TPA6130A2_MUTE_R |
 416                                                 TPA6130A2_MUTE_L;
 417
 418         if (data->power_gpio >= 0) {
 419                 ret = gpio_request(data->power_gpio, "tpa6130a2 enable");
 420                 if (ret < 0) {
 421                         dev_err(dev, "Failed to request power GPIO (%d)\n",
 422                                 data->power_gpio);
 423                         goto err_gpio;
 424                 }
 425                 gpio_direction_output(data->power_gpio, 0);
 426         }
 427
 428         switch (pdata->id) {
 429         case TPA6130A2:
 430                 for (i = 0; i < ARRAY_SIZE(data->supplies); i++)
 431                         data->supplies[i].supply = tpa6130a2_supply_names[i];
 432                 break;
 433         case TPA6140A2:
 434                 for (i = 0; i < ARRAY_SIZE(data->supplies); i++)
 435                         data->supplies[i].supply = tpa6140a2_supply_names[i];;
 436                 break;
 437         default:
 438                 dev_warn(dev, "Unknown TPA model (%d). Assuming 6130A2\n",
 439                          pdata->id);
 440                 for (i = 0; i < ARRAY_SIZE(data->supplies); i++)
 441                         data->supplies[i].supply = tpa6130a2_supply_names[i];
 442         }
 443
 444         ret = regulator_bulk_get(dev, ARRAY_SIZE(data->supplies),
 445                                  data->supplies);
 446         if (ret != 0) {
 447                 dev_err(dev, "Failed to request supplies: %d\n", ret);
 448                 goto err_regulator;
 449         }
 450
 451         ret = tpa6130a2_power(1);
 452         if (ret != 0)
 453                 goto err_power;
 454
 455
 456         /* Read version */
 457         ret = tpa6130a2_i2c_read(TPA6130A2_REG_VERSION) &
 458                                  TPA6130A2_VERSION_MASK;
 459         if ((ret != 1) && (ret != 2))
 460                 dev_warn(dev, "UNTESTED version detected (%d)\n", ret);
 461
 462         /* Disable the chip */
 463         ret = tpa6130a2_power(0);
 464         if (ret != 0)
 465                 goto err_power;
 466
 467         return 0;
 468
 469 err_power:
 470         regulator_bulk_free(ARRAY_SIZE(data->supplies), data->supplies);
 471 err_regulator:
 472         if (data->power_gpio >= 0)
 473                 gpio_free(data->power_gpio);
 474 err_gpio:
 475         kfree(data);
 476         i2c_set_clientdata(tpa6130a2_client, NULL);
 477         tpa6130a2_client = NULL;
 478
 479         return ret;
 480 }
 481
 482 static int __devexit tpa6130a2_remove(struct i2c_client *client)
 483 {
 484         struct tpa6130a2_data *data = i2c_get_clientdata(client);
 485
 486         tpa6130a2_power(0);
 487
 488         if (data->power_gpio >= 0)
 489                 gpio_free(data->power_gpio);
 490
 491         regulator_bulk_free(ARRAY_SIZE(data->supplies), data->supplies);
 492
 493         kfree(data);
 494         tpa6130a2_client = NULL;
 495
 496         return 0;
 497 }
 498
 499 static const struct i2c_device_id tpa6130a2_id[] = {
 500         { "tpa6130a2", 0 },
 501         { }
 502 };
 503 MODULE_DEVICE_TABLE(i2c, tpa6130a2_id);
 504
 505 static struct i2c_driver tpa6130a2_i2c_driver = {
 506         .driver = {
 507                 .name = "tpa6130a2",
 508                 .owner = THIS_MODULE,
 509         },
 510         .probe = tpa6130a2_probe,
 511         .remove = __devexit_p(tpa6130a2_remove),
 512         .id_table = tpa6130a2_id,
 513 };
 514
 515 static int __init tpa6130a2_init(void)
 516 {
 517         return i2c_add_driver(&tpa6130a2_i2c_driver);
 518 }
 519
 520 static void __exit tpa6130a2_exit(void)
 521 {
 522         i2c_del_driver(&tpa6130a2_i2c_driver);
 523 }
 524
 525 MODULE_AUTHOR("Peter Ujfalusi");
 526 MODULE_DESCRIPTION("TPA6130A2 Headphone amplifier driver");
 527 MODULE_LICENSE("GPL");
 528
 529 module_init(tpa6130a2_init);
 530 module_exit(tpa6130a2_exit);