diff options
Diffstat (limited to 'drivers/mfd/wm8400-core.c')
| -rw-r--r-- | drivers/mfd/wm8400-core.c | 420 |
1 files changed, 420 insertions, 0 deletions
diff --git a/drivers/mfd/wm8400-core.c b/drivers/mfd/wm8400-core.c new file mode 100644 index 00000000..1189a17f --- /dev/null +++ b/drivers/mfd/wm8400-core.c @@ -0,0 +1,420 @@ +/* + * Core driver for WM8400. + * + * Copyright 2008 Wolfson Microelectronics PLC. + * + * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of the + * License, or (at your option) any later version. + * + */ + +#include <linux/module.h> +#include <linux/bug.h> +#include <linux/err.h> +#include <linux/i2c.h> +#include <linux/kernel.h> +#include <linux/mfd/core.h> +#include <linux/mfd/wm8400-private.h> +#include <linux/mfd/wm8400-audio.h> +#include <linux/regmap.h> +#include <linux/slab.h> + +static struct { + u16 readable; /* Mask of readable bits */ + u16 writable; /* Mask of writable bits */ + u16 vol; /* Mask of volatile bits */ + int is_codec; /* Register controlled by codec reset */ + u16 default_val; /* Value on reset */ +} reg_data[] = { + { 0xFFFF, 0xFFFF, 0x0000, 0, 0x6172 }, /* R0 */ + { 0x7000, 0x0000, 0x8000, 0, 0x0000 }, /* R1 */ + { 0xFF17, 0xFF17, 0x0000, 0, 0x0000 }, /* R2 */ + { 0xEBF3, 0xEBF3, 0x0000, 1, 0x6000 }, /* R3 */ + { 0x3CF3, 0x3CF3, 0x0000, 1, 0x0000 }, /* R4 */ + { 0xF1F8, 0xF1F8, 0x0000, 1, 0x4050 }, /* R5 */ + { 0xFC1F, 0xFC1F, 0x0000, 1, 0x4000 }, /* R6 */ + { 0xDFDE, 0xDFDE, 0x0000, 1, 0x01C8 }, /* R7 */ + { 0xFCFC, 0xFCFC, 0x0000, 1, 0x0000 }, /* R8 */ + { 0xEFFF, 0xEFFF, 0x0000, 1, 0x0040 }, /* R9 */ + { 0xEFFF, 0xEFFF, 0x0000, 1, 0x0040 }, /* R10 */ + { 0x27F7, 0x27F7, 0x0000, 1, 0x0004 }, /* R11 */ + { 0x01FF, 0x01FF, 0x0000, 1, 0x00C0 }, /* R12 */ + { 0x01FF, 0x01FF, 0x0000, 1, 0x00C0 }, /* R13 */ + { 0x1FEF, 0x1FEF, 0x0000, 1, 0x0000 }, /* R14 */ + { 0x0163, 0x0163, 0x0000, 1, 0x0100 }, /* R15 */ + { 0x01FF, 0x01FF, 0x0000, 1, 0x00C0 }, /* R16 */ + { 0x01FF, 0x01FF, 0x0000, 1, 0x00C0 }, /* R17 */ + { 0x1FFF, 0x0FFF, 0x0000, 1, 0x0000 }, /* R18 */ + { 0xFFFF, 0xFFFF, 0x0000, 1, 0x1000 }, /* R19 */ + { 0xFFFF, 0xFFFF, 0x0000, 1, 0x1010 }, /* R20 */ + { 0xFFFF, 0xFFFF, 0x0000, 1, 0x1010 }, /* R21 */ + { 0x0FDD, 0x0FDD, 0x0000, 1, 0x8000 }, /* R22 */ + { 0x1FFF, 0x1FFF, 0x0000, 1, 0x0800 }, /* R23 */ + { 0x0000, 0x01DF, 0x0000, 1, 0x008B }, /* R24 */ + { 0x0000, 0x01DF, 0x0000, 1, 0x008B }, /* R25 */ + { 0x0000, 0x01DF, 0x0000, 1, 0x008B }, /* R26 */ + { 0x0000, 0x01DF, 0x0000, 1, 0x008B }, /* R27 */ + { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R28 */ + { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R29 */ + { 0x0000, 0x0077, 0x0000, 1, 0x0066 }, /* R30 */ + { 0x0000, 0x0033, 0x0000, 1, 0x0022 }, /* R31 */ + { 0x0000, 0x01FF, 0x0000, 1, 0x0079 }, /* R32 */ + { 0x0000, 0x01FF, 0x0000, 1, 0x0079 }, /* R33 */ + { 0x0000, 0x0003, 0x0000, 1, 0x0003 }, /* R34 */ + { 0x0000, 0x01FF, 0x0000, 1, 0x0003 }, /* R35 */ + { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R36 */ + { 0x0000, 0x003F, 0x0000, 1, 0x0100 }, /* R37 */ + { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R38 */ + { 0x0000, 0x000F, 0x0000, 0, 0x0000 }, /* R39 */ + { 0x0000, 0x00FF, 0x0000, 1, 0x0000 }, /* R40 */ + { 0x0000, 0x01B7, 0x0000, 1, 0x0000 }, /* R41 */ + { 0x0000, 0x01B7, 0x0000, 1, 0x0000 }, /* R42 */ + { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R43 */ + { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R44 */ + { 0x0000, 0x00FD, 0x0000, 1, 0x0000 }, /* R45 */ + { 0x0000, 0x00FD, 0x0000, 1, 0x0000 }, /* R46 */ + { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R47 */ + { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R48 */ + { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R49 */ + { 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R50 */ + { 0x0000, 0x01B3, 0x0000, 1, 0x0180 }, /* R51 */ + { 0x0000, 0x0077, 0x0000, 1, 0x0000 }, /* R52 */ + { 0x0000, 0x0077, 0x0000, 1, 0x0000 }, /* R53 */ + { 0x0000, 0x00FF, 0x0000, 1, 0x0000 }, /* R54 */ + { 0x0000, 0x0001, 0x0000, 1, 0x0000 }, /* R55 */ + { 0x0000, 0x003F, 0x0000, 1, 0x0000 }, /* R56 */ + { 0x0000, 0x004F, 0x0000, 1, 0x0000 }, /* R57 */ + { 0x0000, 0x00FD, 0x0000, 1, 0x0000 }, /* R58 */ + { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R59 */ + { 0x1FFF, 0x1FFF, 0x0000, 1, 0x0000 }, /* R60 */ + { 0xFFFF, 0xFFFF, 0x0000, 1, 0x0000 }, /* R61 */ + { 0x03FF, 0x03FF, 0x0000, 1, 0x0000 }, /* R62 */ + { 0x007F, 0x007F, 0x0000, 1, 0x0000 }, /* R63 */ + { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R64 */ + { 0xDFFF, 0xDFFF, 0x0000, 0, 0x0000 }, /* R65 */ + { 0xDFFF, 0xDFFF, 0x0000, 0, 0x0000 }, /* R66 */ + { 0xDFFF, 0xDFFF, 0x0000, 0, 0x0000 }, /* R67 */ + { 0xDFFF, 0xDFFF, 0x0000, 0, 0x0000 }, /* R68 */ + { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R69 */ + { 0xFFFF, 0xFFFF, 0x0000, 0, 0x4400 }, /* R70 */ + { 0x23FF, 0x23FF, 0x0000, 0, 0x0000 }, /* R71 */ + { 0xFFFF, 0xFFFF, 0x0000, 0, 0x4400 }, /* R72 */ + { 0x23FF, 0x23FF, 0x0000, 0, 0x0000 }, /* R73 */ + { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R74 */ + { 0x000E, 0x000E, 0x0000, 0, 0x0008 }, /* R75 */ + { 0xE00F, 0xE00F, 0x0000, 0, 0x0000 }, /* R76 */ + { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R77 */ + { 0x03C0, 0x03C0, 0x0000, 0, 0x02C0 }, /* R78 */ + { 0xFFFF, 0x0000, 0xffff, 0, 0x0000 }, /* R79 */ + { 0xFFFF, 0xFFFF, 0x0000, 0, 0x0000 }, /* R80 */ + { 0xFFFF, 0x0000, 0xffff, 0, 0x0000 }, /* R81 */ + { 0x2BFF, 0x0000, 0xffff, 0, 0x0000 }, /* R82 */ + { 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R83 */ + { 0x80FF, 0x80FF, 0x0000, 0, 0x00ff }, /* R84 */ +}; + +static int wm8400_read(struct wm8400 *wm8400, u8 reg, int num_regs, u16 *dest) +{ + int i, ret = 0; + + BUG_ON(reg + num_regs > ARRAY_SIZE(wm8400->reg_cache)); + + /* If there are any volatile reads then read back the entire block */ + for (i = reg; i < reg + num_regs; i++) + if (reg_data[i].vol) { + ret = regmap_bulk_read(wm8400->regmap, reg, dest, + num_regs); + return ret; + } + + /* Otherwise use the cache */ + memcpy(dest, &wm8400->reg_cache[reg], num_regs * sizeof(u16)); + + return 0; +} + +static int wm8400_write(struct wm8400 *wm8400, u8 reg, int num_regs, + u16 *src) +{ + int ret, i; + + BUG_ON(reg + num_regs > ARRAY_SIZE(wm8400->reg_cache)); + + for (i = 0; i < num_regs; i++) { + BUG_ON(!reg_data[reg + i].writable); + wm8400->reg_cache[reg + i] = src[i]; + ret = regmap_write(wm8400->regmap, reg, src[i]); + if (ret != 0) + return ret; + } + + return 0; +} + +/** + * wm8400_reg_read - Single register read + * + * @wm8400: Pointer to wm8400 control structure + * @reg: Register to read + * + * @return Read value + */ +u16 wm8400_reg_read(struct wm8400 *wm8400, u8 reg) +{ + u16 val; + + mutex_lock(&wm8400->io_lock); + + wm8400_read(wm8400, reg, 1, &val); + + mutex_unlock(&wm8400->io_lock); + + return val; +} +EXPORT_SYMBOL_GPL(wm8400_reg_read); + +int wm8400_block_read(struct wm8400 *wm8400, u8 reg, int count, u16 *data) +{ + int ret; + + mutex_lock(&wm8400->io_lock); + + ret = wm8400_read(wm8400, reg, count, data); + + mutex_unlock(&wm8400->io_lock); + + return ret; +} +EXPORT_SYMBOL_GPL(wm8400_block_read); + +/** + * wm8400_set_bits - Bitmask write + * + * @wm8400: Pointer to wm8400 control structure + * @reg: Register to access + * @mask: Mask of bits to change + * @val: Value to set for masked bits + */ +int wm8400_set_bits(struct wm8400 *wm8400, u8 reg, u16 mask, u16 val) +{ + u16 tmp; + int ret; + + mutex_lock(&wm8400->io_lock); + + ret = wm8400_read(wm8400, reg, 1, &tmp); + tmp = (tmp & ~mask) | val; + if (ret == 0) + ret = wm8400_write(wm8400, reg, 1, &tmp); + + mutex_unlock(&wm8400->io_lock); + + return ret; +} +EXPORT_SYMBOL_GPL(wm8400_set_bits); + +/** + * wm8400_reset_codec_reg_cache - Reset cached codec registers to + * their default values. + */ +void wm8400_reset_codec_reg_cache(struct wm8400 *wm8400) +{ + int i; + + mutex_lock(&wm8400->io_lock); + + /* Reset all codec registers to their initial value */ + for (i = 0; i < ARRAY_SIZE(wm8400->reg_cache); i++) + if (reg_data[i].is_codec) + wm8400->reg_cache[i] = reg_data[i].default_val; + + mutex_unlock(&wm8400->io_lock); +} +EXPORT_SYMBOL_GPL(wm8400_reset_codec_reg_cache); + +static int wm8400_register_codec(struct wm8400 *wm8400) +{ + struct mfd_cell cell = { + .name = "wm8400-codec", + .platform_data = wm8400, + .pdata_size = sizeof(*wm8400), + }; + + return mfd_add_devices(wm8400->dev, -1, &cell, 1, NULL, 0); +} + +/* + * wm8400_init - Generic initialisation + * + * The WM8400 can be configured as either an I2C or SPI device. Probe + * functions for each bus set up the accessors then call into this to + * set up the device itself. + */ +static int wm8400_init(struct wm8400 *wm8400, + struct wm8400_platform_data *pdata) +{ + u16 reg; + int ret, i; + + mutex_init(&wm8400->io_lock); + + dev_set_drvdata(wm8400->dev, wm8400); + + /* Check that this is actually a WM8400 */ + ret = regmap_read(wm8400->regmap, WM8400_RESET_ID, &i); + if (ret != 0) { + dev_err(wm8400->dev, "Chip ID register read failed\n"); + return -EIO; + } + if (i != reg_data[WM8400_RESET_ID].default_val) { + dev_err(wm8400->dev, "Device is not a WM8400, ID is %x\n", i); + return -ENODEV; + } + + /* We don't know what state the hardware is in and since this + * is a PMIC we can't reset it safely so initialise the register + * cache from the hardware. + */ + ret = regmap_raw_read(wm8400->regmap, 0, wm8400->reg_cache, + ARRAY_SIZE(wm8400->reg_cache)); + if (ret != 0) { + dev_err(wm8400->dev, "Register cache read failed\n"); + return -EIO; + } + for (i = 0; i < ARRAY_SIZE(wm8400->reg_cache); i++) + wm8400->reg_cache[i] = be16_to_cpu(wm8400->reg_cache[i]); + + /* If the codec is in reset use hard coded values */ + if (!(wm8400->reg_cache[WM8400_POWER_MANAGEMENT_1] & WM8400_CODEC_ENA)) + for (i = 0; i < ARRAY_SIZE(wm8400->reg_cache); i++) + if (reg_data[i].is_codec) + wm8400->reg_cache[i] = reg_data[i].default_val; + + ret = wm8400_read(wm8400, WM8400_ID, 1, ®); + if (ret != 0) { + dev_err(wm8400->dev, "ID register read failed: %d\n", ret); + return ret; + } + reg = (reg & WM8400_CHIP_REV_MASK) >> WM8400_CHIP_REV_SHIFT; + dev_info(wm8400->dev, "WM8400 revision %x\n", reg); + + ret = wm8400_register_codec(wm8400); + if (ret != 0) { + dev_err(wm8400->dev, "Failed to register codec\n"); + goto err_children; + } + + if (pdata && pdata->platform_init) { + ret = pdata->platform_init(wm8400->dev); + if (ret != 0) { + dev_err(wm8400->dev, "Platform init failed: %d\n", + ret); + goto err_children; + } + } else + dev_warn(wm8400->dev, "No platform initialisation supplied\n"); + + return 0; + +err_children: + mfd_remove_devices(wm8400->dev); + return ret; +} + +static void wm8400_release(struct wm8400 *wm8400) +{ + mfd_remove_devices(wm8400->dev); +} + +static const struct regmap_config wm8400_regmap_config = { + .reg_bits = 8, + .val_bits = 16, + .max_register = WM8400_REGISTER_COUNT - 1, +}; + +#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) +static int wm8400_i2c_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + struct wm8400 *wm8400; + int ret; + + wm8400 = devm_kzalloc(&i2c->dev, sizeof(struct wm8400), GFP_KERNEL); + if (wm8400 == NULL) { + ret = -ENOMEM; + goto err; + } + + wm8400->regmap = devm_regmap_init_i2c(i2c, &wm8400_regmap_config); + if (IS_ERR(wm8400->regmap)) { + ret = PTR_ERR(wm8400->regmap); + goto err; + } + + wm8400->dev = &i2c->dev; + i2c_set_clientdata(i2c, wm8400); + + ret = wm8400_init(wm8400, i2c->dev.platform_data); + if (ret != 0) + goto err; + + return 0; + +err: + return ret; +} + +static int wm8400_i2c_remove(struct i2c_client *i2c) +{ + struct wm8400 *wm8400 = i2c_get_clientdata(i2c); + + wm8400_release(wm8400); + + return 0; +} + +static const struct i2c_device_id wm8400_i2c_id[] = { + { "wm8400", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, wm8400_i2c_id); + +static struct i2c_driver wm8400_i2c_driver = { + .driver = { + .name = "WM8400", + .owner = THIS_MODULE, + }, + .probe = wm8400_i2c_probe, + .remove = wm8400_i2c_remove, + .id_table = wm8400_i2c_id, +}; +#endif + +static int __init wm8400_module_init(void) +{ + int ret = -ENODEV; + +#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) + ret = i2c_add_driver(&wm8400_i2c_driver); + if (ret != 0) + pr_err("Failed to register I2C driver: %d\n", ret); +#endif + + return ret; +} +subsys_initcall(wm8400_module_init); + +static void __exit wm8400_module_exit(void) +{ +#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) + i2c_del_driver(&wm8400_i2c_driver); +#endif +} +module_exit(wm8400_module_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); |