drivers/mfd/wm8400-core.c

   1 /*
   2  * Core driver for WM8400.
   3  *
   4  * Copyright 2008 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
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of the
  11  * License, or (at your option) any later version.
  12  *
  13  */
  14
  15 #include <linux/bug.h>
  16 #include <linux/err.h>
  17 #include <linux/i2c.h>
  18 #include <linux/kernel.h>
  19 #include <linux/mfd/core.h>
  20 #include <linux/mfd/wm8400-private.h>
  21 #include <linux/mfd/wm8400-audio.h>
  22 #include <linux/regmap.h>
  23 #include <linux/slab.h>
  24
  25 static struct {
  26         u16  readable;    /* Mask of readable bits */
  27         u16  writable;    /* Mask of writable bits */
  28         u16  vol;         /* Mask of volatile bits */
  29         int  is_codec;    /* Register controlled by codec reset */
  30         u16  default_val; /* Value on reset */
  31 } reg_data[] = {
  32         { 0xFFFF, 0xFFFF, 0x0000, 0, 0x6172 }, /* R0 */
  33         { 0x7000, 0x0000, 0x8000, 0, 0x0000 }, /* R1 */
  34         { 0xFF17, 0xFF17, 0x0000, 0, 0x0000 }, /* R2 */
  35         { 0xEBF3, 0xEBF3, 0x0000, 1, 0x6000 }, /* R3 */
  36         { 0x3CF3, 0x3CF3, 0x0000, 1, 0x0000 }, /* R4  */
  37         { 0xF1F8, 0xF1F8, 0x0000, 1, 0x4050 }, /* R5  */
  38         { 0xFC1F, 0xFC1F, 0x0000, 1, 0x4000 }, /* R6  */
  39         { 0xDFDE, 0xDFDE, 0x0000, 1, 0x01C8 }, /* R7  */
  40         { 0xFCFC, 0xFCFC, 0x0000, 1, 0x0000 }, /* R8  */
  41         { 0xEFFF, 0xEFFF, 0x0000, 1, 0x0040 }, /* R9  */
  42         { 0xEFFF, 0xEFFF, 0x0000, 1, 0x0040 }, /* R10 */
  43         { 0x27F7, 0x27F7, 0x0000, 1, 0x0004 }, /* R11 */
  44         { 0x01FF, 0x01FF, 0x0000, 1, 0x00C0 }, /* R12 */
  45         { 0x01FF, 0x01FF, 0x0000, 1, 0x00C0 }, /* R13 */
  46         { 0x1FEF, 0x1FEF, 0x0000, 1, 0x0000 }, /* R14 */
  47         { 0x0163, 0x0163, 0x0000, 1, 0x0100 }, /* R15 */
  48         { 0x01FF, 0x01FF, 0x0000, 1, 0x00C0 }, /* R16 */
  49         { 0x01FF, 0x01FF, 0x0000, 1, 0x00C0 }, /* R17 */
  50         { 0x1FFF, 0x0FFF, 0x0000, 1, 0x0000 }, /* R18 */
  51         { 0xFFFF, 0xFFFF, 0x0000, 1, 0x1000 }, /* R19 */
  52         { 0xFFFF, 0xFFFF, 0x0000, 1, 0x1010 }, /* R20 */
  53         { 0xFFFF, 0xFFFF, 0x0000, 1, 0x1010 }, /* R21 */
  54         { 0x0FDD, 0x0FDD, 0x0000, 1, 0x8000 }, /* R22 */
  55         { 0x1FFF, 0x1FFF, 0x0000, 1, 0x0800 }, /* R23 */
  56         { 0x0000, 0x01DF, 0x0000, 1, 0x008B }, /* R24 */
  57         { 0x0000, 0x01DF, 0x0000, 1, 0x008B }, /* R25 */
  58         { 0x0000, 0x01DF, 0x0000, 1, 0x008B }, /* R26 */
  59         { 0x0000, 0x01DF, 0x0000, 1, 0x008B }, /* R27 */
  60         { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R28 */
  61         { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R29 */
  62         { 0x0000, 0x0077, 0x0000, 1, 0x0066 }, /* R30 */
  63         { 0x0000, 0x0033, 0x0000, 1, 0x0022 }, /* R31 */
  64         { 0x0000, 0x01FF, 0x0000, 1, 0x0079 }, /* R32 */
  65         { 0x0000, 0x01FF, 0x0000, 1, 0x0079 }, /* R33 */
  66         { 0x0000, 0x0003, 0x0000, 1, 0x0003 }, /* R34 */
  67         { 0x0000, 0x01FF, 0x0000, 1, 0x0003 }, /* R35 */
  68         { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R36 */
  69         { 0x0000, 0x003F, 0x0000, 1, 0x0100 }, /* R37 */
  70         { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R38 */
  71         { 0x0000, 0x000F, 0x0000, 0, 0x0000 }, /* R39 */
  72         { 0x0000, 0x00FF, 0x0000, 1, 0x0000 }, /* R40 */
  73         { 0x0000, 0x01B7, 0x0000, 1, 0x0000 }, /* R41 */
  74         { 0x0000, 0x01B7, 0x0000, 1, 0x0000 }, /* R42 */
  75         { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R43 */
  76         { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R44 */
  77         { 0x0000, 0x00FD, 0x0000, 1, 0x0000 }, /* R45 */
  78         { 0x0000, 0x00FD, 0x0000, 1, 0x0000 }, /* R46 */
  79         { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R47 */
  80         { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R48 */
  81         { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R49 */
  82         { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R50 */
  83         { 0x0000, 0x01B3, 0x0000, 1, 0x0180 }, /* R51 */
  84         { 0x0000, 0x0077, 0x0000, 1, 0x0000 }, /* R52 */
  85         { 0x0000, 0x0077, 0x0000, 1, 0x0000 }, /* R53 */
  86         { 0x0000, 0x00FF, 0x0000, 1, 0x0000 }, /* R54 */
  87         { 0x0000, 0x0001, 0x0000, 1, 0x0000 }, /* R55 */
  88         { 0x0000, 0x003F, 0x0000, 1, 0x0000 }, /* R56 */
  89         { 0x0000, 0x004F, 0x0000, 1, 0x0000 }, /* R57 */
  90         { 0x0000, 0x00FD, 0x0000, 1, 0x0000 }, /* R58 */
  91         { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R59 */
  92         { 0x1FFF, 0x1FFF, 0x0000, 1, 0x0000 }, /* R60 */
  93         { 0xFFFF, 0xFFFF, 0x0000, 1, 0x0000 }, /* R61 */
  94         { 0x03FF, 0x03FF, 0x0000, 1, 0x0000 }, /* R62 */
  95         { 0x007F, 0x007F, 0x0000, 1, 0x0000 }, /* R63 */
  96         { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R64 */
  97         { 0xDFFF, 0xDFFF, 0x0000, 0, 0x0000 }, /* R65 */
  98         { 0xDFFF, 0xDFFF, 0x0000, 0, 0x0000 }, /* R66 */
  99         { 0xDFFF, 0xDFFF, 0x0000, 0, 0x0000 }, /* R67 */
 100         { 0xDFFF, 0xDFFF, 0x0000, 0, 0x0000 }, /* R68 */
 101         { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R69 */
 102         { 0xFFFF, 0xFFFF, 0x0000, 0, 0x4400 }, /* R70 */
 103         { 0x23FF, 0x23FF, 0x0000, 0, 0x0000 }, /* R71 */
 104         { 0xFFFF, 0xFFFF, 0x0000, 0, 0x4400 }, /* R72 */
 105         { 0x23FF, 0x23FF, 0x0000, 0, 0x0000 }, /* R73 */
 106         { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R74 */
 107         { 0x000E, 0x000E, 0x0000, 0, 0x0008 }, /* R75 */
 108         { 0xE00F, 0xE00F, 0x0000, 0, 0x0000 }, /* R76 */
 109         { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R77 */
 110         { 0x03C0, 0x03C0, 0x0000, 0, 0x02C0 }, /* R78 */
 111         { 0xFFFF, 0x0000, 0xffff, 0, 0x0000 }, /* R79 */
 112         { 0xFFFF, 0xFFFF, 0x0000, 0, 0x0000 }, /* R80 */
 113         { 0xFFFF, 0x0000, 0xffff, 0, 0x0000 }, /* R81 */
 114         { 0x2BFF, 0x0000, 0xffff, 0, 0x0000 }, /* R82 */
 115         { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R83 */
 116         { 0x80FF, 0x80FF, 0x0000, 0, 0x00ff }, /* R84 */
 117 };
 118
 119 static int wm8400_read(struct wm8400 *wm8400, u8 reg, int num_regs, u16 *dest)
 120 {
 121         int i, ret = 0;
 122
 123         BUG_ON(reg + num_regs > ARRAY_SIZE(wm8400->reg_cache));
 124
 125         /* If there are any volatile reads then read back the entire block */
 126         for (i = reg; i < reg + num_regs; i++)
 127                 if (reg_data[i].vol) {
 128                         ret = regmap_bulk_read(wm8400->regmap, reg, dest,
 129                                                num_regs);
 130                         return ret;
 131                 }
 132
 133         /* Otherwise use the cache */
 134         memcpy(dest, &wm8400->reg_cache[reg], num_regs * sizeof(u16));
 135
 136         return 0;
 137 }
 138
 139 static int wm8400_write(struct wm8400 *wm8400, u8 reg, int num_regs,
 140                         u16 *src)
 141 {
 142         int ret, i;
 143
 144         BUG_ON(reg + num_regs > ARRAY_SIZE(wm8400->reg_cache));
 145
 146         for (i = 0; i < num_regs; i++) {
 147                 BUG_ON(!reg_data[reg + i].writable);
 148                 wm8400->reg_cache[reg + i] = src[i];
 149                 ret = regmap_write(wm8400->regmap, reg, src[i]);
 150                 if (ret != 0)
 151                         return ret;
 152         }
 153
 154         return 0;
 155 }
 156
 157 /**
 158  * wm8400_reg_read - Single register read
 159  *
 160  * @wm8400: Pointer to wm8400 control structure
 161  * @reg:    Register to read
 162  *
 163  * @return  Read value
 164  */
 165 u16 wm8400_reg_read(struct wm8400 *wm8400, u8 reg)
 166 {
 167         u16 val;
 168
 169         mutex_lock(&wm8400->io_lock);
 170
 171         wm8400_read(wm8400, reg, 1, &val);
 172
 173         mutex_unlock(&wm8400->io_lock);
 174
 175         return val;
 176 }
 177 EXPORT_SYMBOL_GPL(wm8400_reg_read);
 178
 179 int wm8400_block_read(struct wm8400 *wm8400, u8 reg, int count, u16 *data)
 180 {
 181         int ret;
 182
 183         mutex_lock(&wm8400->io_lock);
 184
 185         ret = wm8400_read(wm8400, reg, count, data);
 186
 187         mutex_unlock(&wm8400->io_lock);
 188
 189         return ret;
 190 }
 191 EXPORT_SYMBOL_GPL(wm8400_block_read);
 192
 193 /**
 194  * wm8400_set_bits - Bitmask write
 195  *
 196  * @wm8400: Pointer to wm8400 control structure
 197  * @reg:    Register to access
 198  * @mask:   Mask of bits to change
 199  * @val:    Value to set for masked bits
 200  */
 201 int wm8400_set_bits(struct wm8400 *wm8400, u8 reg, u16 mask, u16 val)
 202 {
 203         u16 tmp;
 204         int ret;
 205
 206         mutex_lock(&wm8400->io_lock);
 207
 208         ret = wm8400_read(wm8400, reg, 1, &tmp);
 209         tmp = (tmp & ~mask) | val;
 210         if (ret == 0)
 211                 ret = wm8400_write(wm8400, reg, 1, &tmp);
 212
 213         mutex_unlock(&wm8400->io_lock);
 214
 215         return ret;
 216 }
 217 EXPORT_SYMBOL_GPL(wm8400_set_bits);
 218
 219 /**
 220  * wm8400_reset_codec_reg_cache - Reset cached codec registers to
 221  * their default values.
 222  */
 223 void wm8400_reset_codec_reg_cache(struct wm8400 *wm8400)
 224 {
 225         int i;
 226
 227         mutex_lock(&wm8400->io_lock);
 228
 229         /* Reset all codec registers to their initial value */
 230         for (i = 0; i < ARRAY_SIZE(wm8400->reg_cache); i++)
 231                 if (reg_data[i].is_codec)
 232                         wm8400->reg_cache[i] = reg_data[i].default_val;
 233
 234         mutex_unlock(&wm8400->io_lock);
 235 }
 236 EXPORT_SYMBOL_GPL(wm8400_reset_codec_reg_cache);
 237
 238 static int wm8400_register_codec(struct wm8400 *wm8400)
 239 {
 240         struct mfd_cell cell = {
 241                 .name = "wm8400-codec",
 242                 .platform_data = wm8400,
 243                 .pdata_size = sizeof(*wm8400),
 244         };
 245
 246         return mfd_add_devices(wm8400->dev, -1, &cell, 1, NULL, 0);
 247 }
 248
 249 /*
 250  * wm8400_init - Generic initialisation
 251  *
 252  * The WM8400 can be configured as either an I2C or SPI device.  Probe
 253  * functions for each bus set up the accessors then call into this to
 254  * set up the device itself.
 255  */
 256 static int wm8400_init(struct wm8400 *wm8400,
 257                        struct wm8400_platform_data *pdata)
 258 {
 259         u16 reg;
 260         int ret, i;
 261
 262         mutex_init(&wm8400->io_lock);
 263
 264         dev_set_drvdata(wm8400->dev, wm8400);
 265
 266         /* Check that this is actually a WM8400 */
 267         ret = regmap_read(wm8400->regmap, WM8400_RESET_ID, &i);
 268         if (ret != 0) {
 269                 dev_err(wm8400->dev, "Chip ID register read failed\n");
 270                 return -EIO;
 271         }
 272         if (i != reg_data[WM8400_RESET_ID].default_val) {
 273                 dev_err(wm8400->dev, "Device is not a WM8400, ID is %x\n",
 274                         reg);
 275                 return -ENODEV;
 276         }
 277
 278         /* We don't know what state the hardware is in and since this
 279          * is a PMIC we can't reset it safely so initialise the register
 280          * cache from the hardware.
 281          */
 282         ret = regmap_raw_read(wm8400->regmap, 0, wm8400->reg_cache,
 283                               ARRAY_SIZE(wm8400->reg_cache));
 284         if (ret != 0) {
 285                 dev_err(wm8400->dev, "Register cache read failed\n");
 286                 return -EIO;
 287         }
 288         for (i = 0; i < ARRAY_SIZE(wm8400->reg_cache); i++)
 289                 wm8400->reg_cache[i] = be16_to_cpu(wm8400->reg_cache[i]);
 290
 291         /* If the codec is in reset use hard coded values */
 292         if (!(wm8400->reg_cache[WM8400_POWER_MANAGEMENT_1] & WM8400_CODEC_ENA))
 293                 for (i = 0; i < ARRAY_SIZE(wm8400->reg_cache); i++)
 294                         if (reg_data[i].is_codec)
 295                                 wm8400->reg_cache[i] = reg_data[i].default_val;
 296
 297         ret = wm8400_read(wm8400, WM8400_ID, 1, &reg);
 298         if (ret != 0) {
 299                 dev_err(wm8400->dev, "ID register read failed: %d\n", ret);
 300                 return ret;
 301         }
 302         reg = (reg & WM8400_CHIP_REV_MASK) >> WM8400_CHIP_REV_SHIFT;
 303         dev_info(wm8400->dev, "WM8400 revision %x\n", reg);
 304
 305         ret = wm8400_register_codec(wm8400);
 306         if (ret != 0) {
 307                 dev_err(wm8400->dev, "Failed to register codec\n");
 308                 goto err_children;
 309         }
 310
 311         if (pdata && pdata->platform_init) {
 312                 ret = pdata->platform_init(wm8400->dev);
 313                 if (ret != 0) {
 314                         dev_err(wm8400->dev, "Platform init failed: %d\n",
 315                                 ret);
 316                         goto err_children;
 317                 }
 318         } else
 319                 dev_warn(wm8400->dev, "No platform initialisation supplied\n");
 320
 321         return 0;
 322
 323 err_children:
 324         mfd_remove_devices(wm8400->dev);
 325         return ret;
 326 }
 327
 328 static void wm8400_release(struct wm8400 *wm8400)
 329 {
 330         mfd_remove_devices(wm8400->dev);
 331 }
 332
 333 static const struct regmap_config wm8400_regmap_config = {
 334         .reg_bits = 8,
 335         .val_bits = 16,
 336         .max_register = WM8400_REGISTER_COUNT - 1,
 337 };
 338
 339 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 340 static int wm8400_i2c_probe(struct i2c_client *i2c,
 341                             const struct i2c_device_id *id)
 342 {
 343         struct wm8400 *wm8400;
 344         int ret;
 345
 346         wm8400 = kzalloc(sizeof(struct wm8400), GFP_KERNEL);
 347         if (wm8400 == NULL) {
 348                 ret = -ENOMEM;
 349                 goto err;
 350         }
 351
 352         wm8400->regmap = regmap_init_i2c(i2c, &wm8400_regmap_config);
 353         if (IS_ERR(wm8400->regmap)) {
 354                 ret = PTR_ERR(wm8400->regmap);
 355                 goto struct_err;
 356         }
 357
 358         wm8400->dev = &i2c->dev;
 359         i2c_set_clientdata(i2c, wm8400);
 360
 361         ret = wm8400_init(wm8400, i2c->dev.platform_data);
 362         if (ret != 0)
 363                 goto map_err;
 364
 365         return 0;
 366
 367 map_err:
 368         regmap_exit(wm8400->regmap);
 369 struct_err:
 370         kfree(wm8400);
 371 err:
 372         return ret;
 373 }
 374
 375 static int wm8400_i2c_remove(struct i2c_client *i2c)
 376 {
 377         struct wm8400 *wm8400 = i2c_get_clientdata(i2c);
 378
 379         wm8400_release(wm8400);
 380         regmap_exit(wm8400->regmap);
 381         kfree(wm8400);
 382
 383         return 0;
 384 }
 385
 386 static const struct i2c_device_id wm8400_i2c_id[] = {
 387        { "wm8400", 0 },
 388        { }
 389 };
 390 MODULE_DEVICE_TABLE(i2c, wm8400_i2c_id);
 391
 392 static struct i2c_driver wm8400_i2c_driver = {
 393         .driver = {
 394                 .name = "WM8400",
 395                 .owner = THIS_MODULE,
 396         },
 397         .probe    = wm8400_i2c_probe,
 398         .remove   = wm8400_i2c_remove,
 399         .id_table = wm8400_i2c_id,
 400 };
 401 #endif
 402
 403 static int __init wm8400_module_init(void)
 404 {
 405         int ret = -ENODEV;
 406
 407 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 408         ret = i2c_add_driver(&wm8400_i2c_driver);
 409         if (ret != 0)
 410                 pr_err("Failed to register I2C driver: %d\n", ret);
 411 #endif
 412
 413         return ret;
 414 }
 415 subsys_initcall(wm8400_module_init);
 416
 417 static void __exit wm8400_module_exit(void)
 418 {
 419 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 420         i2c_del_driver(&wm8400_i2c_driver);
 421 #endif
 422 }
 423 module_exit(wm8400_module_exit);
 424
 425 MODULE_LICENSE("GPL");
 426 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");