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