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 <[email protected]>
   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.h>
  34 #include <linux/of_gpio.h>
  35
  36 #include "tpa6130a2.h"
  37
  38 enum tpa_model {
  39         TPA6130A2,
  40         TPA6140A2,
  41 };
  42
  43 static struct i2c_client *tpa6130a2_client;
  44
  45 /* This struct is used to save the context */
  46 struct tpa6130a2_data {
  47         struct mutex mutex;
  48         unsigned char regs[TPA6130A2_CACHEREGNUM];
  49         struct regulator *supply;
  50         int power_gpio;
  51         u8 power_state:1;
  52         enum tpa_model id;
  53 };
  54
  55 static int tpa6130a2_i2c_read(int reg)
  56 {
  57         struct tpa6130a2_data *data;
  58         int val;
  59
  60         if (WARN_ON(!tpa6130a2_client))
  61                 return -EINVAL;
  62         data = i2c_get_clientdata(tpa6130a2_client);
  63
  64         /* If powered off, return the cached value */
  65         if (data->power_state) {
  66                 val = i2c_smbus_read_byte_data(tpa6130a2_client, reg);
  67                 if (val < 0)
  68                         dev_err(&tpa6130a2_client->dev, "Read failed\n");
  69                 else
  70                         data->regs[reg] = val;
  71         } else {
  72                 val = data->regs[reg];
  73         }
  74
  75         return val;
  76 }
  77
  78 static int tpa6130a2_i2c_write(int reg, u8 value)
  79 {
  80         struct tpa6130a2_data *data;
  81         int val = 0;
  82
  83         if (WARN_ON(!tpa6130a2_client))
  84                 return -EINVAL;
  85         data = i2c_get_clientdata(tpa6130a2_client);
  86
  87         if (data->power_state) {
  88                 val = i2c_smbus_write_byte_data(tpa6130a2_client, reg, value);
  89                 if (val < 0) {
  90                         dev_err(&tpa6130a2_client->dev, "Write failed\n");
  91                         return val;
  92                 }
  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         if (WARN_ON(!tpa6130a2_client))
 106                 return 0;
 107         data = i2c_get_clientdata(tpa6130a2_client);
 108
 109         return data->regs[reg];
 110 }
 111
 112 static int tpa6130a2_initialize(void)
 113 {
 114         struct tpa6130a2_data *data;
 115         int i, ret = 0;
 116
 117         if (WARN_ON(!tpa6130a2_client))
 118                 return -EINVAL;
 119         data = i2c_get_clientdata(tpa6130a2_client);
 120
 121         for (i = 1; i < TPA6130A2_REG_VERSION; i++) {
 122                 ret = tpa6130a2_i2c_write(i, data->regs[i]);
 123                 if (ret < 0)
 124                         break;
 125         }
 126
 127         return ret;
 128 }
 129
 130 static int tpa6130a2_power(u8 power)
 131 {
 132         struct  tpa6130a2_data *data;
 133         u8      val;
 134         int     ret = 0;
 135
 136         if (WARN_ON(!tpa6130a2_client))
 137                 return -EINVAL;
 138         data = i2c_get_clientdata(tpa6130a2_client);
 139
 140         mutex_lock(&data->mutex);
 141         if (power == data->power_state)
 142                 goto exit;
 143
 144         if (power) {
 145                 ret = regulator_enable(data->supply);
 146                 if (ret != 0) {
 147                         dev_err(&tpa6130a2_client->dev,
 148                                 "Failed to enable supply: %d\n", ret);
 149                         goto exit;
 150                 }
 151                 /* Power on */
 152                 if (data->power_gpio >= 0)
 153                         gpio_set_value(data->power_gpio, 1);
 154
 155                 data->power_state = 1;
 156                 ret = tpa6130a2_initialize();
 157                 if (ret < 0) {
 158                         dev_err(&tpa6130a2_client->dev,
 159                                 "Failed to initialize chip\n");
 160                         if (data->power_gpio >= 0)
 161                                 gpio_set_value(data->power_gpio, 0);
 162                         regulator_disable(data->supply);
 163                         data->power_state = 0;
 164                         goto exit;
 165                 }
 166         } else {
 167                 /* set SWS */
 168                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
 169                 val |= TPA6130A2_SWS;
 170                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
 171
 172                 /* Power off */
 173                 if (data->power_gpio >= 0)
 174                         gpio_set_value(data->power_gpio, 0);
 175
 176                 ret = regulator_disable(data->supply);
 177                 if (ret != 0) {
 178                         dev_err(&tpa6130a2_client->dev,
 179                                 "Failed to disable supply: %d\n", ret);
 180                         goto exit;
 181                 }
 182
 183                 data->power_state = 0;
 184         }
 185
 186 exit:
 187         mutex_unlock(&data->mutex);
 188         return ret;
 189 }
 190
 191 static int tpa6130a2_get_volsw(struct snd_kcontrol *kcontrol,
 192                 struct snd_ctl_elem_value *ucontrol)
 193 {
 194         struct soc_mixer_control *mc =
 195                 (struct soc_mixer_control *)kcontrol->private_value;
 196         struct tpa6130a2_data *data;
 197         unsigned int reg = mc->reg;
 198         unsigned int shift = mc->shift;
 199         int max = mc->max;
 200         unsigned int mask = (1 << fls(max)) - 1;
 201         unsigned int invert = mc->invert;
 202
 203         if (WARN_ON(!tpa6130a2_client))
 204                 return -EINVAL;
 205         data = i2c_get_clientdata(tpa6130a2_client);
 206
 207         mutex_lock(&data->mutex);
 208
 209         ucontrol->value.integer.value[0] =
 210                 (tpa6130a2_read(reg) >> shift) & mask;
 211
 212         if (invert)
 213                 ucontrol->value.integer.value[0] =
 214                         max - ucontrol->value.integer.value[0];
 215
 216         mutex_unlock(&data->mutex);
 217         return 0;
 218 }
 219
 220 static int tpa6130a2_put_volsw(struct snd_kcontrol *kcontrol,
 221                 struct snd_ctl_elem_value *ucontrol)
 222 {
 223         struct soc_mixer_control *mc =
 224                 (struct soc_mixer_control *)kcontrol->private_value;
 225         struct tpa6130a2_data *data;
 226         unsigned int reg = mc->reg;
 227         unsigned int shift = mc->shift;
 228         int max = mc->max;
 229         unsigned int mask = (1 << fls(max)) - 1;
 230         unsigned int invert = mc->invert;
 231         unsigned int val = (ucontrol->value.integer.value[0] & mask);
 232         unsigned int val_reg;
 233
 234         if (WARN_ON(!tpa6130a2_client))
 235                 return -EINVAL;
 236         data = i2c_get_clientdata(tpa6130a2_client);
 237
 238         if (invert)
 239                 val = max - val;
 240
 241         mutex_lock(&data->mutex);
 242
 243         val_reg = tpa6130a2_read(reg);
 244         if (((val_reg >> shift) & mask) == val) {
 245                 mutex_unlock(&data->mutex);
 246                 return 0;
 247         }
 248
 249         val_reg &= ~(mask << shift);
 250         val_reg |= val << shift;
 251         tpa6130a2_i2c_write(reg, val_reg);
 252
 253         mutex_unlock(&data->mutex);
 254
 255         return 1;
 256 }
 257
 258 /*
 259  * TPA6130 volume. From -59.5 to 4 dB with increasing step size when going
 260  * down in gain.
 261  */
 262 static const unsigned int tpa6130_tlv[] = {
 263         TLV_DB_RANGE_HEAD(10),
 264         0, 1, TLV_DB_SCALE_ITEM(-5950, 600, 0),
 265         2, 3, TLV_DB_SCALE_ITEM(-5000, 250, 0),
 266         4, 5, TLV_DB_SCALE_ITEM(-4550, 160, 0),
 267         6, 7, TLV_DB_SCALE_ITEM(-4140, 190, 0),
 268         8, 9, TLV_DB_SCALE_ITEM(-3650, 120, 0),
 269         10, 11, TLV_DB_SCALE_ITEM(-3330, 160, 0),
 270         12, 13, TLV_DB_SCALE_ITEM(-3040, 180, 0),
 271         14, 20, TLV_DB_SCALE_ITEM(-2710, 110, 0),
 272         21, 37, TLV_DB_SCALE_ITEM(-1960, 74, 0),
 273         38, 63, TLV_DB_SCALE_ITEM(-720, 45, 0),
 274 };
 275
 276 static const struct snd_kcontrol_new tpa6130a2_controls[] = {
 277         SOC_SINGLE_EXT_TLV("TPA6130A2 Headphone Playback Volume",
 278                        TPA6130A2_REG_VOL_MUTE, 0, 0x3f, 0,
 279                        tpa6130a2_get_volsw, tpa6130a2_put_volsw,
 280                        tpa6130_tlv),
 281 };
 282
 283 static const unsigned int tpa6140_tlv[] = {
 284         TLV_DB_RANGE_HEAD(3),
 285         0, 8, TLV_DB_SCALE_ITEM(-5900, 400, 0),
 286         9, 16, TLV_DB_SCALE_ITEM(-2500, 200, 0),
 287         17, 31, TLV_DB_SCALE_ITEM(-1000, 100, 0),
 288 };
 289
 290 static const struct snd_kcontrol_new tpa6140a2_controls[] = {
 291         SOC_SINGLE_EXT_TLV("TPA6140A2 Headphone Playback Volume",
 292                        TPA6130A2_REG_VOL_MUTE, 1, 0x1f, 0,
 293                        tpa6130a2_get_volsw, tpa6130a2_put_volsw,
 294                        tpa6140_tlv),
 295 };
 296
 297 /*
 298  * Enable or disable channel (left or right)
 299  * The bit number for mute and amplifier are the same per channel:
 300  * bit 6: Right channel
 301  * bit 7: Left channel
 302  * in both registers.
 303  */
 304 static void tpa6130a2_channel_enable(u8 channel, int enable)
 305 {
 306         u8      val;
 307
 308         if (enable) {
 309                 /* Enable channel */
 310                 /* Enable amplifier */
 311                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
 312                 val |= channel;
 313                 val &= ~TPA6130A2_SWS;
 314                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
 315
 316                 /* Unmute channel */
 317                 val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
 318                 val &= ~channel;
 319                 tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
 320         } else {
 321                 /* Disable channel */
 322                 /* Mute channel */
 323                 val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
 324                 val |= channel;
 325                 tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
 326
 327                 /* Disable amplifier */
 328                 val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
 329                 val &= ~channel;
 330                 tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
 331         }
 332 }
 333
 334 int tpa6130a2_stereo_enable(struct snd_soc_codec *codec, int enable)
 335 {
 336         int ret = 0;
 337         if (enable) {
 338                 ret = tpa6130a2_power(1);
 339                 if (ret < 0)
 340                         return ret;
 341                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_R | TPA6130A2_HP_EN_L,
 342                                          1);
 343         } else {
 344                 tpa6130a2_channel_enable(TPA6130A2_HP_EN_R | TPA6130A2_HP_EN_L,
 345                                          0);
 346                 ret = tpa6130a2_power(0);
 347         }
 348
 349         return ret;
 350 }
 351 EXPORT_SYMBOL_GPL(tpa6130a2_stereo_enable);
 352
 353 int tpa6130a2_add_controls(struct snd_soc_codec *codec)
 354 {
 355         struct  tpa6130a2_data *data;
 356
 357         if (tpa6130a2_client == NULL)
 358                 return -ENODEV;
 359
 360         data = i2c_get_clientdata(tpa6130a2_client);
 361
 362         if (data->id == TPA6140A2)
 363                 return snd_soc_add_codec_controls(codec, tpa6140a2_controls,
 364                                                 ARRAY_SIZE(tpa6140a2_controls));
 365         else
 366                 return snd_soc_add_codec_controls(codec, tpa6130a2_controls,
 367                                                 ARRAY_SIZE(tpa6130a2_controls));
 368 }
 369 EXPORT_SYMBOL_GPL(tpa6130a2_add_controls);
 370
 371 static int tpa6130a2_probe(struct i2c_client *client,
 372                            const struct i2c_device_id *id)
 373 {
 374         struct device *dev;
 375         struct tpa6130a2_data *data;
 376         struct tpa6130a2_platform_data *pdata = client->dev.platform_data;
 377         struct device_node *np = client->dev.of_node;
 378         const char *regulator;
 379         int ret;
 380
 381         dev = &client->dev;
 382
 383         data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
 384         if (!data)
 385                 return -ENOMEM;
 386
 387         if (pdata) {
 388                 data->power_gpio = pdata->power_gpio;
 389         } else if (np) {
 390                 data->power_gpio = of_get_named_gpio(np, "power-gpio", 0);
 391         } else {
 392                 dev_err(dev, "Platform data not set\n");
 393                 dump_stack();
 394                 return -ENODEV;
 395         }
 396
 397         tpa6130a2_client = client;
 398
 399         i2c_set_clientdata(tpa6130a2_client, data);
 400
 401         data->id = id->driver_data;
 402
 403         mutex_init(&data->mutex);
 404
 405         /* Set default register values */
 406         data->regs[TPA6130A2_REG_CONTROL] =     TPA6130A2_SWS;
 407         data->regs[TPA6130A2_REG_VOL_MUTE] =    TPA6130A2_MUTE_R |
 408                                                 TPA6130A2_MUTE_L;
 409
 410         if (data->power_gpio >= 0) {
 411                 ret = devm_gpio_request(dev, data->power_gpio,
 412                                         "tpa6130a2 enable");
 413                 if (ret < 0) {
 414                         dev_err(dev, "Failed to request power GPIO (%d)\n",
 415                                 data->power_gpio);
 416                         goto err_gpio;
 417                 }
 418                 gpio_direction_output(data->power_gpio, 0);
 419         }
 420
 421         switch (data->id) {
 422         default:
 423                 dev_warn(dev, "Unknown TPA model (%d). Assuming 6130A2\n",
 424                          data->id);
 425         case TPA6130A2:
 426                 regulator = "Vdd";
 427                 break;
 428         case TPA6140A2:
 429                 regulator = "AVdd";
 430                 break;
 431         }
 432
 433         data->supply = devm_regulator_get(dev, regulator);
 434         if (IS_ERR(data->supply)) {
 435                 ret = PTR_ERR(data->supply);
 436                 dev_err(dev, "Failed to request supply: %d\n", ret);
 437                 goto err_gpio;
 438         }
 439
 440         ret = tpa6130a2_power(1);
 441         if (ret != 0)
 442                 goto err_gpio;
 443
 444
 445         /* Read version */
 446         ret = tpa6130a2_i2c_read(TPA6130A2_REG_VERSION) &
 447                                  TPA6130A2_VERSION_MASK;
 448         if ((ret != 1) && (ret != 2))
 449                 dev_warn(dev, "UNTESTED version detected (%d)\n", ret);
 450
 451         /* Disable the chip */
 452         ret = tpa6130a2_power(0);
 453         if (ret != 0)
 454                 goto err_gpio;
 455
 456         return 0;
 457
 458 err_gpio:
 459         tpa6130a2_client = NULL;
 460
 461         return ret;
 462 }
 463
 464 static int tpa6130a2_remove(struct i2c_client *client)
 465 {
 466         tpa6130a2_power(0);
 467         tpa6130a2_client = NULL;
 468
 469         return 0;
 470 }
 471
 472 static const struct i2c_device_id tpa6130a2_id[] = {
 473         { "tpa6130a2", TPA6130A2 },
 474         { "tpa6140a2", TPA6140A2 },
 475         { }
 476 };
 477 MODULE_DEVICE_TABLE(i2c, tpa6130a2_id);
 478
 479 #if IS_ENABLED(CONFIG_OF)
 480 static const struct of_device_id tpa6130a2_of_match[] = {
 481         { .compatible = "ti,tpa6130a2", },
 482         { .compatible = "ti,tpa6140a2" },
 483         {},
 484 };
 485 MODULE_DEVICE_TABLE(of, tpa6130a2_of_match);
 486 #endif
 487
 488 static struct i2c_driver tpa6130a2_i2c_driver = {
 489         .driver = {
 490                 .name = "tpa6130a2",
 491                 .owner = THIS_MODULE,
 492                 .of_match_table = of_match_ptr(tpa6130a2_of_match),
 493         },
 494         .probe = tpa6130a2_probe,
 495         .remove = tpa6130a2_remove,
 496         .id_table = tpa6130a2_id,
 497 };
 498
 499 module_i2c_driver(tpa6130a2_i2c_driver);
 500
 501 MODULE_AUTHOR("Peter Ujfalusi <[email protected]>");
 502 MODULE_DESCRIPTION("TPA6130A2 Headphone amplifier driver");
 503 MODULE_LICENSE("GPL");