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 /* This struct is used to save the context */
  40 struct tpa6130a2_data {
  41         struct mutex mutex;
  42         unsigned char regs[TPA6130A2_CACHEREGNUM];
  43         struct regulator *supply;
  44         int power_gpio;
  45         unsigned char power_state;
  46         enum tpa_model id;
  47 };
  48
  49 static int tpa6130a2_i2c_read(int reg)
  50 {
  51         struct tpa6130a2_data *data;
  52         int val;
  53
  54         BUG_ON(tpa6130a2_client == NULL);
  55         data = i2c_get_clientdata(tpa6130a2_client);
  56
  57         /* If powered off, return the cached value */
  58         if (data->power_state) {
  59                 val = i2c_smbus_read_byte_data(tpa6130a2_client, reg);
  60                 if (val < 0)
  61                         dev_err(&tpa6130a2_client->dev, "Read failed\n");
  62                 else
  63                         data->regs[reg] = val;
  64         } else {
  65                 val = data->regs[reg];
  66         }
  67
  68         return val;
  69 }
  70
  71 static int tpa6130a2_i2c_write(int reg, u8 value)
  72 {
  73         struct tpa6130a2_data *data;
  74         int val = 0;
  75
  76         BUG_ON(tpa6130a2_client == NULL);
  77         data = i2c_get_clientdata(tpa6130a2_client);
  78
  79         if (data->power_state) {
  80                 val = i2c_smbus_write_byte_data(tpa6130a2_client, reg, value);
  81                 if (val < 0) {
  82                         dev_err(&tpa6130a2_client->dev, "Write failed\n");
  83                         return val;
  84                 }
  85         }
  86
  87         /* Either powered on or off, we save the context */
  88         data->regs[reg] = value;
  89
  90         return val;
  91 }
  92
  93 static u8 tpa6130a2_read(int reg)
  94 {
  95         struct tpa6130a2_data *data;
  96
  97         BUG_ON(tpa6130a2_client == NULL);
  98         data = i2c_get_clientdata(tpa6130a2_client);
  99
 100         return data->regs[reg];
 101 }
 102
 103 static int tpa6130a2_initialize(void)
 104 {
 105         struct tpa6130a2_data *data;
 106         int i, ret = 0;
 107
 108         BUG_ON(tpa6130a2_client == NULL);
 109         data = i2c_get_clientdata(tpa6130a2_client);
 110
 111         for (i = 1; i < TPA6130A2_REG_VERSION; i++) {
 112                 ret = tpa6130a2_i2c_write(i, data->regs[i]);
 113                 if (ret < 0)
 114                         break;
 115         }
 116
 117         return ret;
 118 }
 119
 120 static int tpa6130a2_power(int power)
 121 {
 122         struct  tpa6130a2_data *data;
 123         u8      val;
 124         int     ret = 0;
 125
 126         BUG_ON(tpa6130a2_client == NULL);
 127         data = i2c_get_clientdata(tpa6130a2_client);
 128
 129         mutex_lock(&data->mutex);
 130         if (power && !data->power_state) {
 131                 /* Power on */
 132                 if (data->power_gpio >= 0)
 133                         gpio_set_value(data->power_gpio, 1);
 134
 135                 ret = regulator_enable(data->supply);
 136                 if (ret != 0) {
 137                         dev_err(&tpa6130a2_client->dev,
 138                                 "Failed to enable supply: %d\n", ret);
 139                         goto exit;
 140                 }
 141
 142                 data->power_state = 1;
 143                 ret = tpa6130a2_initialize();
 144                 if (ret < 0) {
 145                         dev_err(&tpa6130a2_client->dev,
 146                                 "Failed to initialize chip\n");
 147                         if (data->power_gpio >= 0)
 148                                 gpio_set_value(data->power_gpio, 0);
 149                         regulator_disable(data->supply);
 150                         data->power_state = 0;
 151                         goto exit;
 152                 }
 153
 154                 /* Clear SWS */
 155                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
 156                 val &= ~TPA6130A2_SWS;
 157                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
 158         } else if (!power && data->power_state) {
 159                 /* set SWS */
 160                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
 161                 val |= TPA6130A2_SWS;
 162                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
 163
 164                 /* Power off */
 165                 if (data->power_gpio >= 0)
 166                         gpio_set_value(data->power_gpio, 0);
 167
 168                 ret = regulator_disable(data->supply);
 169                 if (ret != 0) {
 170                         dev_err(&tpa6130a2_client->dev,
 171                                 "Failed to disable supply: %d\n", ret);
 172                         goto exit;
 173                 }
 174
 175                 data->power_state = 0;
 176         }
 177
 178 exit:
 179         mutex_unlock(&data->mutex);
 180         return ret;
 181 }
 182
 183 static int tpa6130a2_get_volsw(struct snd_kcontrol *kcontrol,
 184                 struct snd_ctl_elem_value *ucontrol)
 185 {
 186         struct soc_mixer_control *mc =
 187                 (struct soc_mixer_control *)kcontrol->private_value;
 188         struct tpa6130a2_data *data;
 189         unsigned int reg = mc->reg;
 190         unsigned int shift = mc->shift;
 191         int max = mc->max;
 192         unsigned int mask = (1 << fls(max)) - 1;
 193         unsigned int invert = mc->invert;
 194
 195         BUG_ON(tpa6130a2_client == NULL);
 196         data = i2c_get_clientdata(tpa6130a2_client);
 197
 198         mutex_lock(&data->mutex);
 199
 200         ucontrol->value.integer.value[0] =
 201                 (tpa6130a2_read(reg) >> shift) & mask;
 202
 203         if (invert)
 204                 ucontrol->value.integer.value[0] =
 205                         max - ucontrol->value.integer.value[0];
 206
 207         mutex_unlock(&data->mutex);
 208         return 0;
 209 }
 210
 211 static int tpa6130a2_put_volsw(struct snd_kcontrol *kcontrol,
 212                 struct snd_ctl_elem_value *ucontrol)
 213 {
 214         struct soc_mixer_control *mc =
 215                 (struct soc_mixer_control *)kcontrol->private_value;
 216         struct tpa6130a2_data *data;
 217         unsigned int reg = mc->reg;
 218         unsigned int shift = mc->shift;
 219         int max = mc->max;
 220         unsigned int mask = (1 << fls(max)) - 1;
 221         unsigned int invert = mc->invert;
 222         unsigned int val = (ucontrol->value.integer.value[0] & mask);
 223         unsigned int val_reg;
 224
 225         BUG_ON(tpa6130a2_client == NULL);
 226         data = i2c_get_clientdata(tpa6130a2_client);
 227
 228         if (invert)
 229                 val = max - val;
 230
 231         mutex_lock(&data->mutex);
 232
 233         val_reg = tpa6130a2_read(reg);
 234         if (((val_reg >> shift) & mask) == val) {
 235                 mutex_unlock(&data->mutex);
 236                 return 0;
 237         }
 238
 239         val_reg &= ~(mask << shift);
 240         val_reg |= val << shift;
 241         tpa6130a2_i2c_write(reg, val_reg);
 242
 243         mutex_unlock(&data->mutex);
 244
 245         return 1;
 246 }
 247
 248 /*
 249  * TPA6130 volume. From -59.5 to 4 dB with increasing step size when going
 250  * down in gain.
 251  */
 252 static const unsigned int tpa6130_tlv[] = {
 253         TLV_DB_RANGE_HEAD(10),
 254         0, 1, TLV_DB_SCALE_ITEM(-5950, 600, 0),
 255         2, 3, TLV_DB_SCALE_ITEM(-5000, 250, 0),
 256         4, 5, TLV_DB_SCALE_ITEM(-4550, 160, 0),
 257         6, 7, TLV_DB_SCALE_ITEM(-4140, 190, 0),
 258         8, 9, TLV_DB_SCALE_ITEM(-3650, 120, 0),
 259         10, 11, TLV_DB_SCALE_ITEM(-3330, 160, 0),
 260         12, 13, TLV_DB_SCALE_ITEM(-3040, 180, 0),
 261         14, 20, TLV_DB_SCALE_ITEM(-2710, 110, 0),
 262         21, 37, TLV_DB_SCALE_ITEM(-1960, 74, 0),
 263         38, 63, TLV_DB_SCALE_ITEM(-720, 45, 0),
 264 };
 265
 266 static const struct snd_kcontrol_new tpa6130a2_controls[] = {
 267         SOC_SINGLE_EXT_TLV("TPA6130A2 Headphone Playback Volume",
 268                        TPA6130A2_REG_VOL_MUTE, 0, 0x3f, 0,
 269                        tpa6130a2_get_volsw, tpa6130a2_put_volsw,
 270                        tpa6130_tlv),
 271 };
 272
 273 static const unsigned int tpa6140_tlv[] = {
 274         TLV_DB_RANGE_HEAD(3),
 275         0, 8, TLV_DB_SCALE_ITEM(-5900, 400, 0),
 276         9, 16, TLV_DB_SCALE_ITEM(-2500, 200, 0),
 277         17, 31, TLV_DB_SCALE_ITEM(-1000, 100, 0),
 278 };
 279
 280 static const struct snd_kcontrol_new tpa6140a2_controls[] = {
 281         SOC_SINGLE_EXT_TLV("TPA6140A2 Headphone Playback Volume",
 282                        TPA6130A2_REG_VOL_MUTE, 1, 0x1f, 0,
 283                        tpa6130a2_get_volsw, tpa6130a2_put_volsw,
 284                        tpa6140_tlv),
 285 };
 286
 287 /*
 288  * Enable or disable channel (left or right)
 289  * The bit number for mute and amplifier are the same per channel:
 290  * bit 6: Right channel
 291  * bit 7: Left channel
 292  * in both registers.
 293  */
 294 static void tpa6130a2_channel_enable(u8 channel, int enable)
 295 {
 296         u8      val;
 297
 298         if (enable) {
 299                 /* Enable channel */
 300                 /* Enable amplifier */
 301                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
 302                 val |= channel;
 303                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
 304
 305                 /* Unmute channel */
 306                 val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
 307                 val &= ~channel;
 308                 tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
 309         } else {
 310                 /* Disable channel */
 311                 /* Mute channel */
 312                 val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
 313                 val |= channel;
 314                 tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
 315
 316                 /* Disable amplifier */
 317                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
 318                 val &= ~channel;
 319                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
 320         }
 321 }
 322
 323 static int tpa6130a2_left_event(struct snd_soc_dapm_widget *w,
 324                 struct snd_kcontrol *kcontrol, int event)
 325 {
 326         switch (event) {
 327         case SND_SOC_DAPM_POST_PMU:
 328                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_L, 1);
 329                 break;
 330         case SND_SOC_DAPM_POST_PMD:
 331                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_L, 0);
 332                 break;
 333         }
 334         return 0;
 335 }
 336
 337 static int tpa6130a2_right_event(struct snd_soc_dapm_widget *w,
 338                 struct snd_kcontrol *kcontrol, int event)
 339 {
 340         switch (event) {
 341         case SND_SOC_DAPM_POST_PMU:
 342                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_R, 1);
 343                 break;
 344         case SND_SOC_DAPM_POST_PMD:
 345                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_R, 0);
 346                 break;
 347         }
 348         return 0;
 349 }
 350
 351 static int tpa6130a2_supply_event(struct snd_soc_dapm_widget *w,
 352                 struct snd_kcontrol *kcontrol, int event)
 353 {
 354         int ret = 0;
 355
 356         switch (event) {
 357         case SND_SOC_DAPM_POST_PMU:
 358                 ret = tpa6130a2_power(1);
 359                 break;
 360         case SND_SOC_DAPM_POST_PMD:
 361                 ret = tpa6130a2_power(0);
 362                 break;
 363         }
 364         return ret;
 365 }
 366
 367 static const struct snd_soc_dapm_widget tpa6130a2_dapm_widgets[] = {
 368         SND_SOC_DAPM_PGA_E("TPA6130A2 Left", SND_SOC_NOPM,
 369                         0, 0, NULL, 0, tpa6130a2_left_event,
 370                         SND_SOC_DAPM_POST_PMU|SND_SOC_DAPM_POST_PMD),
 371         SND_SOC_DAPM_PGA_E("TPA6130A2 Right", SND_SOC_NOPM,
 372                         0, 0, NULL, 0, tpa6130a2_right_event,
 373                         SND_SOC_DAPM_POST_PMU|SND_SOC_DAPM_POST_PMD),
 374         SND_SOC_DAPM_SUPPLY("TPA6130A2 Enable", SND_SOC_NOPM,
 375                         0, 0, tpa6130a2_supply_event,
 376                         SND_SOC_DAPM_POST_PMU|SND_SOC_DAPM_POST_PMD),
 377         /* Outputs */
 378         SND_SOC_DAPM_OUTPUT("TPA6130A2 Headphone Left"),
 379         SND_SOC_DAPM_OUTPUT("TPA6130A2 Headphone Right"),
 380 };
 381
 382 static const struct snd_soc_dapm_route audio_map[] = {
 383         {"TPA6130A2 Headphone Left", NULL, "TPA6130A2 Left"},
 384         {"TPA6130A2 Headphone Right", NULL, "TPA6130A2 Right"},
 385
 386         {"TPA6130A2 Headphone Left", NULL, "TPA6130A2 Enable"},
 387         {"TPA6130A2 Headphone Right", NULL, "TPA6130A2 Enable"},
 388 };
 389
 390 int tpa6130a2_add_controls(struct snd_soc_codec *codec)
 391 {
 392         struct  tpa6130a2_data *data;
 393
 394         if (tpa6130a2_client == NULL)
 395                 return -ENODEV;
 396
 397         data = i2c_get_clientdata(tpa6130a2_client);
 398
 399         snd_soc_dapm_new_controls(codec, tpa6130a2_dapm_widgets,
 400                                 ARRAY_SIZE(tpa6130a2_dapm_widgets));
 401
 402         snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
 403
 404         if (data->id == TPA6140A2)
 405                 return snd_soc_add_controls(codec, tpa6140a2_controls,
 406                                                 ARRAY_SIZE(tpa6140a2_controls));
 407         else
 408                 return snd_soc_add_controls(codec, tpa6130a2_controls,
 409                                                 ARRAY_SIZE(tpa6130a2_controls));
 410
 411 }
 412 EXPORT_SYMBOL_GPL(tpa6130a2_add_controls);
 413
 414 static int __devinit tpa6130a2_probe(struct i2c_client *client,
 415                                      const struct i2c_device_id *id)
 416 {
 417         struct device *dev;
 418         struct tpa6130a2_data *data;
 419         struct tpa6130a2_platform_data *pdata;
 420         const char *regulator;
 421         int ret;
 422
 423         dev = &client->dev;
 424
 425         if (client->dev.platform_data == NULL) {
 426                 dev_err(dev, "Platform data not set\n");
 427                 dump_stack();
 428                 return -ENODEV;
 429         }
 430
 431         data = kzalloc(sizeof(*data), GFP_KERNEL);
 432         if (data == NULL) {
 433                 dev_err(dev, "Can not allocate memory\n");
 434                 return -ENOMEM;
 435         }
 436
 437         tpa6130a2_client = client;
 438
 439         i2c_set_clientdata(tpa6130a2_client, data);
 440
 441         pdata = client->dev.platform_data;
 442         data->power_gpio = pdata->power_gpio;
 443         data->id = pdata->id;
 444
 445         mutex_init(&data->mutex);
 446
 447         /* Set default register values */
 448         data->regs[TPA6130A2_REG_CONTROL] =     TPA6130A2_SWS;
 449         data->regs[TPA6130A2_REG_VOL_MUTE] =    TPA6130A2_MUTE_R |
 450                                                 TPA6130A2_MUTE_L;
 451
 452         if (data->power_gpio >= 0) {
 453                 ret = gpio_request(data->power_gpio, "tpa6130a2 enable");
 454                 if (ret < 0) {
 455                         dev_err(dev, "Failed to request power GPIO (%d)\n",
 456                                 data->power_gpio);
 457                         goto err_gpio;
 458                 }
 459                 gpio_direction_output(data->power_gpio, 0);
 460         }
 461
 462         switch (data->id) {
 463         default:
 464                 dev_warn(dev, "Unknown TPA model (%d). Assuming 6130A2\n",
 465                          pdata->id);
 466         case TPA6130A2:
 467                 regulator = "Vdd";
 468                 break;
 469         case TPA6140A2:
 470                 regulator = "AVdd";
 471                 break;
 472         }
 473
 474         data->supply = regulator_get(dev, regulator);
 475         if (IS_ERR(data->supply)) {
 476                 ret = PTR_ERR(data->supply);
 477                 dev_err(dev, "Failed to request supply: %d\n", ret);
 478                 goto err_regulator;
 479         }
 480
 481         ret = tpa6130a2_power(1);
 482         if (ret != 0)
 483                 goto err_power;
 484
 485
 486         /* Read version */
 487         ret = tpa6130a2_i2c_read(TPA6130A2_REG_VERSION) &
 488                                  TPA6130A2_VERSION_MASK;
 489         if ((ret != 1) && (ret != 2))
 490                 dev_warn(dev, "UNTESTED version detected (%d)\n", ret);
 491
 492         /* Disable the chip */
 493         ret = tpa6130a2_power(0);
 494         if (ret != 0)
 495                 goto err_power;
 496
 497         return 0;
 498
 499 err_power:
 500         regulator_put(data->supply);
 501 err_regulator:
 502         if (data->power_gpio >= 0)
 503                 gpio_free(data->power_gpio);
 504 err_gpio:
 505         kfree(data);
 506         i2c_set_clientdata(tpa6130a2_client, NULL);
 507         tpa6130a2_client = NULL;
 508
 509         return ret;
 510 }
 511
 512 static int __devexit tpa6130a2_remove(struct i2c_client *client)
 513 {
 514         struct tpa6130a2_data *data = i2c_get_clientdata(client);
 515
 516         tpa6130a2_power(0);
 517
 518         if (data->power_gpio >= 0)
 519                 gpio_free(data->power_gpio);
 520
 521         regulator_put(data->supply);
 522
 523         kfree(data);
 524         tpa6130a2_client = NULL;
 525
 526         return 0;
 527 }
 528
 529 static const struct i2c_device_id tpa6130a2_id[] = {
 530         { "tpa6130a2", 0 },
 531         { }
 532 };
 533 MODULE_DEVICE_TABLE(i2c, tpa6130a2_id);
 534
 535 static struct i2c_driver tpa6130a2_i2c_driver = {
 536         .driver = {
 537                 .name = "tpa6130a2",
 538                 .owner = THIS_MODULE,
 539         },
 540         .probe = tpa6130a2_probe,
 541         .remove = __devexit_p(tpa6130a2_remove),
 542         .id_table = tpa6130a2_id,
 543 };
 544
 545 static int __init tpa6130a2_init(void)
 546 {
 547         return i2c_add_driver(&tpa6130a2_i2c_driver);
 548 }
 549
 550 static void __exit tpa6130a2_exit(void)
 551 {
 552         i2c_del_driver(&tpa6130a2_i2c_driver);
 553 }
 554
 555 MODULE_AUTHOR("Peter Ujfalusi");
 556 MODULE_DESCRIPTION("TPA6130A2 Headphone amplifier driver");
 557 MODULE_LICENSE("GPL");
 558
 559 module_init(tpa6130a2_init);
 560 module_exit(tpa6130a2_exit);