sound/soc/soc-cache.c

   1 /*
   2  * soc-cache.c  --  ASoC register cache helpers
   3  *
   4  * Copyright 2009 Wolfson Microelectronics PLC.
   5  *
   6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7  *
   8  *  This program is free software; you can redistribute  it and/or modify it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  */
  13
  14 #include <linux/i2c.h>
  15 #include <linux/spi/spi.h>
  16 #include <sound/soc.h>
  17
  18 static unsigned int snd_soc_4_12_read(struct snd_soc_codec *codec,
  19                                      unsigned int reg)
  20 {
  21         u16 *cache = codec->reg_cache;
  22         if (reg >= codec->reg_cache_size)
  23                 return -1;
  24         return cache[reg];
  25 }
  26
  27 static int snd_soc_4_12_write(struct snd_soc_codec *codec, unsigned int reg,
  28                              unsigned int value)
  29 {
  30         u16 *cache = codec->reg_cache;
  31         u8 data[2];
  32         int ret;
  33
  34         BUG_ON(codec->volatile_register);
  35
  36         data[0] = (reg << 4) | ((value >> 8) & 0x000f);
  37         data[1] = value & 0x00ff;
  38
  39         if (reg < codec->reg_cache_size)
  40                 cache[reg] = value;
  41
  42         if (codec->cache_only) {
  43                 codec->cache_sync = 1;
  44                 return 0;
  45         }
  46
  47         dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
  48
  49         ret = codec->hw_write(codec->control_data, data, 2);
  50         if (ret == 2)
  51                 return 0;
  52         if (ret < 0)
  53                 return ret;
  54         else
  55                 return -EIO;
  56 }
  57
  58 #if defined(CONFIG_SPI_MASTER)
  59 static int snd_soc_4_12_spi_write(void *control_data, const char *data,
  60                                  int len)
  61 {
  62         struct spi_device *spi = control_data;
  63         struct spi_transfer t;
  64         struct spi_message m;
  65         u8 msg[2];
  66
  67         if (len <= 0)
  68                 return 0;
  69
  70         msg[0] = data[1];
  71         msg[1] = data[0];
  72
  73         spi_message_init(&m);
  74         memset(&t, 0, (sizeof t));
  75
  76         t.tx_buf = &msg[0];
  77         t.len = len;
  78
  79         spi_message_add_tail(&t, &m);
  80         spi_sync(spi, &m);
  81
  82         return len;
  83 }
  84 #else
  85 #define snd_soc_4_12_spi_write NULL
  86 #endif
  87
  88 static unsigned int snd_soc_7_9_read(struct snd_soc_codec *codec,
  89                                      unsigned int reg)
  90 {
  91         u16 *cache = codec->reg_cache;
  92         if (reg >= codec->reg_cache_size)
  93                 return -1;
  94         return cache[reg];
  95 }
  96
  97 static int snd_soc_7_9_write(struct snd_soc_codec *codec, unsigned int reg,
  98                              unsigned int value)
  99 {
 100         u16 *cache = codec->reg_cache;
 101         u8 data[2];
 102         int ret;
 103
 104         BUG_ON(codec->volatile_register);
 105
 106         data[0] = (reg << 1) | ((value >> 8) & 0x0001);
 107         data[1] = value & 0x00ff;
 108
 109         if (reg < codec->reg_cache_size)
 110                 cache[reg] = value;
 111
 112         if (codec->cache_only) {
 113                 codec->cache_sync = 1;
 114                 return 0;
 115         }
 116
 117         dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
 118
 119         ret = codec->hw_write(codec->control_data, data, 2);
 120         if (ret == 2)
 121                 return 0;
 122         if (ret < 0)
 123                 return ret;
 124         else
 125                 return -EIO;
 126 }
 127
 128 #if defined(CONFIG_SPI_MASTER)
 129 static int snd_soc_7_9_spi_write(void *control_data, const char *data,
 130                                  int len)
 131 {
 132         struct spi_device *spi = control_data;
 133         struct spi_transfer t;
 134         struct spi_message m;
 135         u8 msg[2];
 136
 137         if (len <= 0)
 138                 return 0;
 139
 140         msg[0] = data[0];
 141         msg[1] = data[1];
 142
 143         spi_message_init(&m);
 144         memset(&t, 0, (sizeof t));
 145
 146         t.tx_buf = &msg[0];
 147         t.len = len;
 148
 149         spi_message_add_tail(&t, &m);
 150         spi_sync(spi, &m);
 151
 152         return len;
 153 }
 154 #else
 155 #define snd_soc_7_9_spi_write NULL
 156 #endif
 157
 158 static int snd_soc_8_8_write(struct snd_soc_codec *codec, unsigned int reg,
 159                              unsigned int value)
 160 {
 161         u8 *cache = codec->reg_cache;
 162         u8 data[2];
 163
 164         BUG_ON(codec->volatile_register);
 165
 166         reg &= 0xff;
 167         data[0] = reg;
 168         data[1] = value & 0xff;
 169
 170         if (reg < codec->reg_cache_size)
 171                 cache[reg] = value;
 172
 173         if (codec->cache_only) {
 174                 codec->cache_sync = 1;
 175                 return 0;
 176         }
 177
 178         dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
 179
 180         if (codec->hw_write(codec->control_data, data, 2) == 2)
 181                 return 0;
 182         else
 183                 return -EIO;
 184 }
 185
 186 static unsigned int snd_soc_8_8_read(struct snd_soc_codec *codec,
 187                                      unsigned int reg)
 188 {
 189         u8 *cache = codec->reg_cache;
 190         reg &= 0xff;
 191         if (reg >= codec->reg_cache_size)
 192                 return -1;
 193         return cache[reg];
 194 }
 195
 196 static int snd_soc_8_16_write(struct snd_soc_codec *codec, unsigned int reg,
 197                               unsigned int value)
 198 {
 199         u16 *reg_cache = codec->reg_cache;
 200         u8 data[3];
 201
 202         data[0] = reg;
 203         data[1] = (value >> 8) & 0xff;
 204         data[2] = value & 0xff;
 205
 206         if (!snd_soc_codec_volatile_register(codec, reg)
 207                 && reg < codec->reg_cache_size)
 208                         reg_cache[reg] = value;
 209
 210         if (codec->cache_only) {
 211                 codec->cache_sync = 1;
 212                 return 0;
 213         }
 214
 215         dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
 216
 217         if (codec->hw_write(codec->control_data, data, 3) == 3)
 218                 return 0;
 219         else
 220                 return -EIO;
 221 }
 222
 223 static unsigned int snd_soc_8_16_read(struct snd_soc_codec *codec,
 224                                       unsigned int reg)
 225 {
 226         u16 *cache = codec->reg_cache;
 227
 228         if (reg >= codec->reg_cache_size ||
 229             snd_soc_codec_volatile_register(codec, reg)) {
 230                 if (codec->cache_only)
 231                         return -EINVAL;
 232
 233                 return codec->hw_read(codec, reg);
 234         } else {
 235                 return cache[reg];
 236         }
 237 }
 238
 239 #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
 240 static unsigned int snd_soc_8_8_read_i2c(struct snd_soc_codec *codec,
 241                                           unsigned int r)
 242 {
 243         struct i2c_msg xfer[2];
 244         u8 reg = r;
 245         u8 data;
 246         int ret;
 247         struct i2c_client *client = codec->control_data;
 248
 249         /* Write register */
 250         xfer[0].addr = client->addr;
 251         xfer[0].flags = 0;
 252         xfer[0].len = 1;
 253         xfer[0].buf = &reg;
 254
 255         /* Read data */
 256         xfer[1].addr = client->addr;
 257         xfer[1].flags = I2C_M_RD;
 258         xfer[1].len = 1;
 259         xfer[1].buf = &data;
 260
 261         ret = i2c_transfer(client->adapter, xfer, 2);
 262         if (ret != 2) {
 263                 dev_err(&client->dev, "i2c_transfer() returned %d\n", ret);
 264                 return 0;
 265         }
 266
 267         return data;
 268 }
 269 #else
 270 #define snd_soc_8_8_read_i2c NULL
 271 #endif
 272
 273 #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
 274 static unsigned int snd_soc_8_16_read_i2c(struct snd_soc_codec *codec,
 275                                           unsigned int r)
 276 {
 277         struct i2c_msg xfer[2];
 278         u8 reg = r;
 279         u16 data;
 280         int ret;
 281         struct i2c_client *client = codec->control_data;
 282
 283         /* Write register */
 284         xfer[0].addr = client->addr;
 285         xfer[0].flags = 0;
 286         xfer[0].len = 1;
 287         xfer[0].buf = &reg;
 288
 289         /* Read data */
 290         xfer[1].addr = client->addr;
 291         xfer[1].flags = I2C_M_RD;
 292         xfer[1].len = 2;
 293         xfer[1].buf = (u8 *)&data;
 294
 295         ret = i2c_transfer(client->adapter, xfer, 2);
 296         if (ret != 2) {
 297                 dev_err(&client->dev, "i2c_transfer() returned %d\n", ret);
 298                 return 0;
 299         }
 300
 301         return (data >> 8) | ((data & 0xff) << 8);
 302 }
 303 #else
 304 #define snd_soc_8_16_read_i2c NULL
 305 #endif
 306
 307 #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
 308 static unsigned int snd_soc_16_8_read_i2c(struct snd_soc_codec *codec,
 309                                           unsigned int r)
 310 {
 311         struct i2c_msg xfer[2];
 312         u16 reg = r;
 313         u8 data;
 314         int ret;
 315         struct i2c_client *client = codec->control_data;
 316
 317         /* Write register */
 318         xfer[0].addr = client->addr;
 319         xfer[0].flags = 0;
 320         xfer[0].len = 2;
 321         xfer[0].buf = (u8 *)&reg;
 322
 323         /* Read data */
 324         xfer[1].addr = client->addr;
 325         xfer[1].flags = I2C_M_RD;
 326         xfer[1].len = 1;
 327         xfer[1].buf = &data;
 328
 329         ret = i2c_transfer(client->adapter, xfer, 2);
 330         if (ret != 2) {
 331                 dev_err(&client->dev, "i2c_transfer() returned %d\n", ret);
 332                 return 0;
 333         }
 334
 335         return data;
 336 }
 337 #else
 338 #define snd_soc_16_8_read_i2c NULL
 339 #endif
 340
 341 static unsigned int snd_soc_16_8_read(struct snd_soc_codec *codec,
 342                                      unsigned int reg)
 343 {
 344         u8 *cache = codec->reg_cache;
 345
 346         reg &= 0xff;
 347         if (reg >= codec->reg_cache_size)
 348                 return -1;
 349         return cache[reg];
 350 }
 351
 352 static int snd_soc_16_8_write(struct snd_soc_codec *codec, unsigned int reg,
 353                              unsigned int value)
 354 {
 355         u8 *cache = codec->reg_cache;
 356         u8 data[3];
 357         int ret;
 358
 359         BUG_ON(codec->volatile_register);
 360
 361         data[0] = (reg >> 8) & 0xff;
 362         data[1] = reg & 0xff;
 363         data[2] = value;
 364
 365         reg &= 0xff;
 366         if (reg < codec->reg_cache_size)
 367                 cache[reg] = value;
 368
 369         if (codec->cache_only) {
 370                 codec->cache_sync = 1;
 371                 return 0;
 372         }
 373
 374         dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
 375
 376         ret = codec->hw_write(codec->control_data, data, 3);
 377         if (ret == 3)
 378                 return 0;
 379         if (ret < 0)
 380                 return ret;
 381         else
 382                 return -EIO;
 383 }
 384
 385 #if defined(CONFIG_SPI_MASTER)
 386 static int snd_soc_16_8_spi_write(void *control_data, const char *data,
 387                                  int len)
 388 {
 389         struct spi_device *spi = control_data;
 390         struct spi_transfer t;
 391         struct spi_message m;
 392         u8 msg[3];
 393
 394         if (len <= 0)
 395                 return 0;
 396
 397         msg[0] = data[0];
 398         msg[1] = data[1];
 399         msg[2] = data[2];
 400
 401         spi_message_init(&m);
 402         memset(&t, 0, (sizeof t));
 403
 404         t.tx_buf = &msg[0];
 405         t.len = len;
 406
 407         spi_message_add_tail(&t, &m);
 408         spi_sync(spi, &m);
 409
 410         return len;
 411 }
 412 #else
 413 #define snd_soc_16_8_spi_write NULL
 414 #endif
 415
 416 #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
 417 static unsigned int snd_soc_16_16_read_i2c(struct snd_soc_codec *codec,
 418                                            unsigned int r)
 419 {
 420         struct i2c_msg xfer[2];
 421         u16 reg = cpu_to_be16(r);
 422         u16 data;
 423         int ret;
 424         struct i2c_client *client = codec->control_data;
 425
 426         /* Write register */
 427         xfer[0].addr = client->addr;
 428         xfer[0].flags = 0;
 429         xfer[0].len = 2;
 430         xfer[0].buf = (u8 *)&reg;
 431
 432         /* Read data */
 433         xfer[1].addr = client->addr;
 434         xfer[1].flags = I2C_M_RD;
 435         xfer[1].len = 2;
 436         xfer[1].buf = (u8 *)&data;
 437
 438         ret = i2c_transfer(client->adapter, xfer, 2);
 439         if (ret != 2) {
 440                 dev_err(&client->dev, "i2c_transfer() returned %d\n", ret);
 441                 return 0;
 442         }
 443
 444         return be16_to_cpu(data);
 445 }
 446 #else
 447 #define snd_soc_16_16_read_i2c NULL
 448 #endif
 449
 450 static unsigned int snd_soc_16_16_read(struct snd_soc_codec *codec,
 451                                        unsigned int reg)
 452 {
 453         u16 *cache = codec->reg_cache;
 454
 455         if (reg >= codec->reg_cache_size ||
 456             snd_soc_codec_volatile_register(codec, reg)) {
 457                 if (codec->cache_only)
 458                         return -EINVAL;
 459
 460                 return codec->hw_read(codec, reg);
 461         }
 462
 463         return cache[reg];
 464 }
 465
 466 static int snd_soc_16_16_write(struct snd_soc_codec *codec, unsigned int reg,
 467                                unsigned int value)
 468 {
 469         u16 *cache = codec->reg_cache;
 470         u8 data[4];
 471         int ret;
 472
 473         data[0] = (reg >> 8) & 0xff;
 474         data[1] = reg & 0xff;
 475         data[2] = (value >> 8) & 0xff;
 476         data[3] = value & 0xff;
 477
 478         if (reg < codec->reg_cache_size)
 479                 cache[reg] = value;
 480
 481         if (codec->cache_only) {
 482                 codec->cache_sync = 1;
 483                 return 0;
 484         }
 485
 486         dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
 487
 488         ret = codec->hw_write(codec->control_data, data, 4);
 489         if (ret == 4)
 490                 return 0;
 491         if (ret < 0)
 492                 return ret;
 493         else
 494                 return -EIO;
 495 }
 496
 497 static struct {
 498         int addr_bits;
 499         int data_bits;
 500         int (*write)(struct snd_soc_codec *codec, unsigned int, unsigned int);
 501         int (*spi_write)(void *, const char *, int);
 502         unsigned int (*read)(struct snd_soc_codec *, unsigned int);
 503         unsigned int (*i2c_read)(struct snd_soc_codec *, unsigned int);
 504 } io_types[] = {
 505         {
 506                 .addr_bits = 4, .data_bits = 12,
 507                 .write = snd_soc_4_12_write, .read = snd_soc_4_12_read,
 508                 .spi_write = snd_soc_4_12_spi_write,
 509         },
 510         {
 511                 .addr_bits = 7, .data_bits = 9,
 512                 .write = snd_soc_7_9_write, .read = snd_soc_7_9_read,
 513                 .spi_write = snd_soc_7_9_spi_write,
 514         },
 515         {
 516                 .addr_bits = 8, .data_bits = 8,
 517                 .write = snd_soc_8_8_write, .read = snd_soc_8_8_read,
 518                 .i2c_read = snd_soc_8_8_read_i2c,
 519         },
 520         {
 521                 .addr_bits = 8, .data_bits = 16,
 522                 .write = snd_soc_8_16_write, .read = snd_soc_8_16_read,
 523                 .i2c_read = snd_soc_8_16_read_i2c,
 524         },
 525         {
 526                 .addr_bits = 16, .data_bits = 8,
 527                 .write = snd_soc_16_8_write, .read = snd_soc_16_8_read,
 528                 .i2c_read = snd_soc_16_8_read_i2c,
 529                 .spi_write = snd_soc_16_8_spi_write,
 530         },
 531         {
 532                 .addr_bits = 16, .data_bits = 16,
 533                 .write = snd_soc_16_16_write, .read = snd_soc_16_16_read,
 534                 .i2c_read = snd_soc_16_16_read_i2c,
 535         },
 536 };
 537
 538 /**
 539  * snd_soc_codec_set_cache_io: Set up standard I/O functions.
 540  *
 541  * @codec: CODEC to configure.
 542  * @type: Type of cache.
 543  * @addr_bits: Number of bits of register address data.
 544  * @data_bits: Number of bits of data per register.
 545  * @control: Control bus used.
 546  *
 547  * Register formats are frequently shared between many I2C and SPI
 548  * devices.  In order to promote code reuse the ASoC core provides
 549  * some standard implementations of CODEC read and write operations
 550  * which can be set up using this function.
 551  *
 552  * The caller is responsible for allocating and initialising the
 553  * actual cache.
 554  *
 555  * Note that at present this code cannot be used by CODECs with
 556  * volatile registers.
 557  */
 558 int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec,
 559                                int addr_bits, int data_bits,
 560                                enum snd_soc_control_type control)
 561 {
 562         int i;
 563
 564         for (i = 0; i < ARRAY_SIZE(io_types); i++)
 565                 if (io_types[i].addr_bits == addr_bits &&
 566                     io_types[i].data_bits == data_bits)
 567                         break;
 568         if (i == ARRAY_SIZE(io_types)) {
 569                 printk(KERN_ERR
 570                        "No I/O functions for %d bit address %d bit data\n",
 571                        addr_bits, data_bits);
 572                 return -EINVAL;
 573         }
 574
 575         codec->write = io_types[i].write;
 576         codec->read = io_types[i].read;
 577
 578         switch (control) {
 579         case SND_SOC_CUSTOM:
 580                 break;
 581
 582         case SND_SOC_I2C:
 583 #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
 584                 codec->hw_write = (hw_write_t)i2c_master_send;
 585 #endif
 586                 if (io_types[i].i2c_read)
 587                         codec->hw_read = io_types[i].i2c_read;
 588                 break;
 589
 590         case SND_SOC_SPI:
 591                 if (io_types[i].spi_write)
 592                         codec->hw_write = io_types[i].spi_write;
 593                 break;
 594         }
 595
 596         return 0;
 597 }
 598 EXPORT_SYMBOL_GPL(snd_soc_codec_set_cache_io);