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