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 #include <linux/of_gpio.h>
  34
  35 #include "tpa6130a2.h"
  36
  37 enum tpa_model {
  38         TPA6130A2,
  39         TPA6140A2,
  40 };
  41
  42 static struct i2c_client *tpa6130a2_client;
  43
  44 /* This struct is used to save the context */
  45 struct tpa6130a2_data {
  46         struct mutex mutex;
  47         unsigned char regs[TPA6130A2_CACHEREGNUM];
  48         struct regulator *supply;
  49         int power_gpio;
  50         u8 power_state:1;
  51         enum tpa_model id;
  52 };
  53
  54 static int tpa6130a2_i2c_read(int reg)
  55 {
  56         struct tpa6130a2_data *data;
  57         int val;
  58
  59         if (WARN_ON(!tpa6130a2_client))
  60                 return -EINVAL;
  61         data = i2c_get_clientdata(tpa6130a2_client);
  62
  63         /* If powered off, return the cached value */
  64         if (data->power_state) {
  65                 val = i2c_smbus_read_byte_data(tpa6130a2_client, reg);
  66                 if (val < 0)
  67                         dev_err(&tpa6130a2_client->dev, "Read failed\n");
  68                 else
  69                         data->regs[reg] = val;
  70         } else {
  71                 val = data->regs[reg];
  72         }
  73
  74         return val;
  75 }
  76
  77 static int tpa6130a2_i2c_write(int reg, u8 value)
  78 {
  79         struct tpa6130a2_data *data;
  80         int val = 0;
  81
  82         if (WARN_ON(!tpa6130a2_client))
  83                 return -EINVAL;
  84         data = i2c_get_clientdata(tpa6130a2_client);
  85
  86         if (data->power_state) {
  87                 val = i2c_smbus_write_byte_data(tpa6130a2_client, reg, value);
  88                 if (val < 0) {
  89                         dev_err(&tpa6130a2_client->dev, "Write failed\n");
  90                         return val;
  91                 }
  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         if (WARN_ON(!tpa6130a2_client))
 105                 return 0;
 106         data = i2c_get_clientdata(tpa6130a2_client);
 107
 108         return data->regs[reg];
 109 }
 110
 111 static int tpa6130a2_initialize(void)
 112 {
 113         struct tpa6130a2_data *data;
 114         int i, ret = 0;
 115
 116         if (WARN_ON(!tpa6130a2_client))
 117                 return -EINVAL;
 118         data = i2c_get_clientdata(tpa6130a2_client);
 119
 120         for (i = 1; i < TPA6130A2_REG_VERSION; i++) {
 121                 ret = tpa6130a2_i2c_write(i, data->regs[i]);
 122                 if (ret < 0)
 123                         break;
 124         }
 125
 126         return ret;
 127 }
 128
 129 static int tpa6130a2_power(u8 power)
 130 {
 131         struct  tpa6130a2_data *data;
 132         u8      val;
 133         int     ret = 0;
 134
 135         if (WARN_ON(!tpa6130a2_client))
 136                 return -EINVAL;
 137         data = i2c_get_clientdata(tpa6130a2_client);
 138
 139         mutex_lock(&data->mutex);
 140         if (power == data->power_state)
 141                 goto exit;
 142
 143         if (power) {
 144                 ret = regulator_enable(data->supply);
 145                 if (ret != 0) {
 146                         dev_err(&tpa6130a2_client->dev,
 147                                 "Failed to enable supply: %d\n", ret);
 148                         goto exit;
 149                 }
 150                 /* Power on */
 151                 if (data->power_gpio >= 0)
 152                         gpio_set_value(data->power_gpio, 1);
 153
 154                 data->power_state = 1;
 155                 ret = tpa6130a2_initialize();
 156                 if (ret < 0) {
 157                         dev_err(&tpa6130a2_client->dev,
 158                                 "Failed to initialize chip\n");
 159                         if (data->power_gpio >= 0)
 160                                 gpio_set_value(data->power_gpio, 0);
 161                         regulator_disable(data->supply);
 162                         data->power_state = 0;
 163                         goto exit;
 164                 }
 165         } else {
 166                 /* set SWS */
 167                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
 168                 val |= TPA6130A2_SWS;
 169                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
 170
 171                 /* Power off */
 172                 if (data->power_gpio >= 0)
 173                         gpio_set_value(data->power_gpio, 0);
 174
 175                 ret = regulator_disable(data->supply);
 176                 if (ret != 0) {
 177                         dev_err(&tpa6130a2_client->dev,
 178                                 "Failed to disable supply: %d\n", ret);
 179                         goto exit;
 180                 }
 181
 182                 data->power_state = 0;
 183         }
 184
 185 exit:
 186         mutex_unlock(&data->mutex);
 187         return ret;
 188 }
 189
 190 static int tpa6130a2_get_volsw(struct snd_kcontrol *kcontrol,
 191                 struct snd_ctl_elem_value *ucontrol)
 192 {
 193         struct soc_mixer_control *mc =
 194                 (struct soc_mixer_control *)kcontrol->private_value;
 195         struct tpa6130a2_data *data;
 196         unsigned int reg = mc->reg;
 197         unsigned int shift = mc->shift;
 198         int max = mc->max;
 199         unsigned int mask = (1 << fls(max)) - 1;
 200         unsigned int invert = mc->invert;
 201
 202         if (WARN_ON(!tpa6130a2_client))
 203                 return -EINVAL;
 204         data = i2c_get_clientdata(tpa6130a2_client);
 205
 206         mutex_lock(&data->mutex);
 207
 208         ucontrol->value.integer.value[0] =
 209                 (tpa6130a2_read(reg) >> shift) & mask;
 210
 211         if (invert)
 212                 ucontrol->value.integer.value[0] =
 213                         max - ucontrol->value.integer.value[0];
 214
 215         mutex_unlock(&data->mutex);
 216         return 0;
 217 }
 218
 219 static int tpa6130a2_put_volsw(struct snd_kcontrol *kcontrol,
 220                 struct snd_ctl_elem_value *ucontrol)
 221 {
 222         struct soc_mixer_control *mc =
 223                 (struct soc_mixer_control *)kcontrol->private_value;
 224         struct tpa6130a2_data *data;
 225         unsigned int reg = mc->reg;
 226         unsigned int shift = mc->shift;
 227         int max = mc->max;
 228         unsigned int mask = (1 << fls(max)) - 1;
 229         unsigned int invert = mc->invert;
 230         unsigned int val = (ucontrol->value.integer.value[0] & mask);
 231         unsigned int val_reg;
 232
 233         if (WARN_ON(!tpa6130a2_client))
 234                 return -EINVAL;
 235         data = i2c_get_clientdata(tpa6130a2_client);
 236
 237         if (invert)
 238                 val = max - val;
 239
 240         mutex_lock(&data->mutex);
 241
 242         val_reg = tpa6130a2_read(reg);
 243         if (((val_reg >> shift) & mask) == val) {
 244                 mutex_unlock(&data->mutex);
 245                 return 0;
 246         }
 247
 248         val_reg &= ~(mask << shift);
 249         val_reg |= val << shift;
 250         tpa6130a2_i2c_write(reg, val_reg);
 251
 252         mutex_unlock(&data->mutex);
 253
 254         return 1;
 255 }
 256
 257 /*
 258  * TPA6130 volume. From -59.5 to 4 dB with increasing step size when going
 259  * down in gain.
 260  */
 261 static const unsigned int tpa6130_tlv[] = {
 262         TLV_DB_RANGE_HEAD(10),
 263         0, 1, TLV_DB_SCALE_ITEM(-5950, 600, 0),
 264         2, 3, TLV_DB_SCALE_ITEM(-5000, 250, 0),
 265         4, 5, TLV_DB_SCALE_ITEM(-4550, 160, 0),
 266         6, 7, TLV_DB_SCALE_ITEM(-4140, 190, 0),
 267         8, 9, TLV_DB_SCALE_ITEM(-3650, 120, 0),
 268         10, 11, TLV_DB_SCALE_ITEM(-3330, 160, 0),
 269         12, 13, TLV_DB_SCALE_ITEM(-3040, 180, 0),
 270         14, 20, TLV_DB_SCALE_ITEM(-2710, 110, 0),
 271         21, 37, TLV_DB_SCALE_ITEM(-1960, 74, 0),
 272         38, 63, TLV_DB_SCALE_ITEM(-720, 45, 0),
 273 };
 274
 275 static const struct snd_kcontrol_new tpa6130a2_controls[] = {
 276         SOC_SINGLE_EXT_TLV("TPA6130A2 Headphone Playback Volume",
 277                        TPA6130A2_REG_VOL_MUTE, 0, 0x3f, 0,
 278                        tpa6130a2_get_volsw, tpa6130a2_put_volsw,
 279                        tpa6130_tlv),
 280 };
 281
 282 static const unsigned int tpa6140_tlv[] = {
 283         TLV_DB_RANGE_HEAD(3),
 284         0, 8, TLV_DB_SCALE_ITEM(-5900, 400, 0),
 285         9, 16, TLV_DB_SCALE_ITEM(-2500, 200, 0),
 286         17, 31, TLV_DB_SCALE_ITEM(-1000, 100, 0),
 287 };
 288
 289 static const struct snd_kcontrol_new tpa6140a2_controls[] = {
 290         SOC_SINGLE_EXT_TLV("TPA6140A2 Headphone Playback Volume",
 291                        TPA6130A2_REG_VOL_MUTE, 1, 0x1f, 0,
 292                        tpa6130a2_get_volsw, tpa6130a2_put_volsw,
 293                        tpa6140_tlv),
 294 };
 295
 296 /*
 297  * Enable or disable channel (left or right)
 298  * The bit number for mute and amplifier are the same per channel:
 299  * bit 6: Right channel
 300  * bit 7: Left channel
 301  * in both registers.
 302  */
 303 static void tpa6130a2_channel_enable(u8 channel, int enable)
 304 {
 305         u8      val;
 306
 307         if (enable) {
 308                 /* Enable channel */
 309                 /* Enable amplifier */
 310                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
 311                 val |= channel;
 312                 val &= ~TPA6130A2_SWS;
 313                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
 314
 315                 /* Unmute channel */
 316                 val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
 317                 val &= ~channel;
 318                 tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
 319         } else {
 320                 /* Disable channel */
 321                 /* Mute channel */
 322                 val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
 323                 val |= channel;
 324                 tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
 325
 326                 /* Disable amplifier */
 327                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
 328                 val &= ~channel;
 329                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
 330         }
 331 }
 332
 333 int tpa6130a2_stereo_enable(struct snd_soc_codec *codec, int enable)
 334 {
 335         int ret = 0;
 336         if (enable) {
 337                 ret = tpa6130a2_power(1);
 338                 if (ret < 0)
 339                         return ret;
 340                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_R | TPA6130A2_HP_EN_L,
 341                                          1);
 342         } else {
 343                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_R | TPA6130A2_HP_EN_L,
 344                                          0);
 345                 ret = tpa6130a2_power(0);
 346         }
 347
 348         return ret;
 349 }
 350 EXPORT_SYMBOL_GPL(tpa6130a2_stereo_enable);
 351
 352 int tpa6130a2_add_controls(struct snd_soc_codec *codec)
 353 {
 354         struct  tpa6130a2_data *data;
 355
 356         if (tpa6130a2_client == NULL)
 357                 return -ENODEV;
 358
 359         data = i2c_get_clientdata(tpa6130a2_client);
 360
 361         if (data->id == TPA6140A2)
 362                 return snd_soc_add_codec_controls(codec, tpa6140a2_controls,
 363                                                 ARRAY_SIZE(tpa6140a2_controls));
 364         else
 365                 return snd_soc_add_codec_controls(codec, tpa6130a2_controls,
 366                                                 ARRAY_SIZE(tpa6130a2_controls));
 367 }
 368 EXPORT_SYMBOL_GPL(tpa6130a2_add_controls);
 369
 370 static int tpa6130a2_probe(struct i2c_client *client,
 371                            const struct i2c_device_id *id)
 372 {
 373         struct device *dev;
 374         struct tpa6130a2_data *data;
 375         struct tpa6130a2_platform_data *pdata = client->dev.platform_data;
 376         struct device_node *np = client->dev.of_node;
 377         const char *regulator;
 378         int ret;
 379
 380         dev = &client->dev;
 381
 382         data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
 383         if (data == NULL) {
 384                 dev_err(dev, "Can not allocate memory\n");
 385                 return -ENOMEM;
 386         }
 387
 388         if (pdata) {
 389                 data->power_gpio = pdata->power_gpio;
 390         } else if (np) {
 391                 data->power_gpio = of_get_named_gpio(np, "power-gpio", 0);
 392         } else {
 393                 dev_err(dev, "Platform data not set\n");
 394                 dump_stack();
 395                 return -ENODEV;
 396         }
 397
 398         tpa6130a2_client = client;
 399
 400         i2c_set_clientdata(tpa6130a2_client, data);
 401
 402         data->id = id->driver_data;
 403
 404         mutex_init(&data->mutex);
 405
 406         /* Set default register values */
 407         data->regs[TPA6130A2_REG_CONTROL] =     TPA6130A2_SWS;
 408         data->regs[TPA6130A2_REG_VOL_MUTE] =    TPA6130A2_MUTE_R |
 409                                                 TPA6130A2_MUTE_L;
 410
 411         if (data->power_gpio >= 0) {
 412                 ret = devm_gpio_request(dev, data->power_gpio,
 413                                         "tpa6130a2 enable");
 414                 if (ret < 0) {
 415                         dev_err(dev, "Failed to request power GPIO (%d)\n",
 416                                 data->power_gpio);
 417                         goto err_gpio;
 418                 }
 419                 gpio_direction_output(data->power_gpio, 0);
 420         }
 421
 422         switch (data->id) {
 423         default:
 424                 dev_warn(dev, "Unknown TPA model (%d). Assuming 6130A2\n",
 425                          data->id);
 426         case TPA6130A2:
 427                 regulator = "Vdd";
 428                 break;
 429         case TPA6140A2:
 430                 regulator = "AVdd";
 431                 break;
 432         }
 433
 434         data->supply = devm_regulator_get(dev, regulator);
 435         if (IS_ERR(data->supply)) {
 436                 ret = PTR_ERR(data->supply);
 437                 dev_err(dev, "Failed to request supply: %d\n", ret);
 438                 goto err_gpio;
 439         }
 440
 441         ret = tpa6130a2_power(1);
 442         if (ret != 0)
 443                 goto err_gpio;
 444
 445
 446         /* Read version */
 447         ret = tpa6130a2_i2c_read(TPA6130A2_REG_VERSION) &
 448                                  TPA6130A2_VERSION_MASK;
 449         if ((ret != 1) && (ret != 2))
 450                 dev_warn(dev, "UNTESTED version detected (%d)\n", ret);
 451
 452         /* Disable the chip */
 453         ret = tpa6130a2_power(0);
 454         if (ret != 0)
 455                 goto err_gpio;
 456
 457         return 0;
 458
 459 err_gpio:
 460         tpa6130a2_client = NULL;
 461
 462         return ret;
 463 }
 464
 465 static int tpa6130a2_remove(struct i2c_client *client)
 466 {
 467         tpa6130a2_power(0);
 468         tpa6130a2_client = NULL;
 469
 470         return 0;
 471 }
 472
 473 static const struct i2c_device_id tpa6130a2_id[] = {
 474         { "tpa6130a2", TPA6130A2 },
 475         { "tpa6140a2", TPA6140A2 },
 476         { }
 477 };
 478 MODULE_DEVICE_TABLE(i2c, tpa6130a2_id);
 479
 480 #if IS_ENABLED(CONFIG_OF)
 481 static const struct of_device_id tpa6130a2_of_match[] = {
 482         { .compatible = "ti,tpa6130a2", },
 483         { .compatible = "ti,tpa6140a2" },
 484         {},
 485 };
 486 MODULE_DEVICE_TABLE(of, tpa6130a2_of_match);
 487 #endif
 488
 489 static struct i2c_driver tpa6130a2_i2c_driver = {
 490         .driver = {
 491                 .name = "tpa6130a2",
 492                 .owner = THIS_MODULE,
 493                 .of_match_table = of_match_ptr(tpa6130a2_of_match),
 494         },
 495         .probe = tpa6130a2_probe,
 496         .remove = tpa6130a2_remove,
 497         .id_table = tpa6130a2_id,
 498 };
 499
 500 module_i2c_driver(tpa6130a2_i2c_driver);
 501
 502 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
 503 MODULE_DESCRIPTION("TPA6130A2 Headphone amplifier driver");
 504 MODULE_LICENSE("GPL");