428 строки
12 KiB
C
428 строки
12 KiB
C
/*
|
|
* 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",
|
|
reg);
|
|
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 = kzalloc(sizeof(struct wm8400), GFP_KERNEL);
|
|
if (wm8400 == NULL) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
|
|
wm8400->regmap = regmap_init_i2c(i2c, &wm8400_regmap_config);
|
|
if (IS_ERR(wm8400->regmap)) {
|
|
ret = PTR_ERR(wm8400->regmap);
|
|
goto struct_err;
|
|
}
|
|
|
|
wm8400->dev = &i2c->dev;
|
|
i2c_set_clientdata(i2c, wm8400);
|
|
|
|
ret = wm8400_init(wm8400, i2c->dev.platform_data);
|
|
if (ret != 0)
|
|
goto map_err;
|
|
|
|
return 0;
|
|
|
|
map_err:
|
|
regmap_exit(wm8400->regmap);
|
|
struct_err:
|
|
kfree(wm8400);
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
static int wm8400_i2c_remove(struct i2c_client *i2c)
|
|
{
|
|
struct wm8400 *wm8400 = i2c_get_clientdata(i2c);
|
|
|
|
wm8400_release(wm8400);
|
|
regmap_exit(wm8400->regmap);
|
|
kfree(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>");
|