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mfd: Convert WM8400 to regmap API 

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2011-08-09 16:34:29 +09:00
parent d6c645fc00
commit 50eeef5d3c
2 changed files with 32 additions and 81 deletions
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106
drivers/mfd/wm8400-core.c
View File

@ -13,11 +13,13 @@
*/
#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 {
@ -123,14 +125,9 @@ static int wm8400_read(struct wm8400 *wm8400, u8 reg, int num_regs, u16 *dest)
/* 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 = wm8400->read_dev(wm8400->io_data, reg,
num_regs, dest);
if (ret != 0)
return ret;
for (i = 0; i < num_regs; i++)
dest[i] = be16_to_cpu(dest[i]);
return 0;
ret = regmap_bulk_read(wm8400->regmap, reg, dest,
num_regs);
return ret;
}
/* Otherwise use the cache */
@ -149,14 +146,11 @@ static int wm8400_write(struct wm8400 *wm8400, u8 reg, int num_regs,
for (i = 0; i < num_regs; i++) {
BUG_ON(!reg_data[reg + i].writable);
wm8400->reg_cache[reg + i] = src[i];
src[i] = cpu_to_be16(src[i]);
ret = regmap_write(wm8400->regmap, reg, src[i]);
if (ret != 0)
return ret;
}
/* Do the actual I/O */
ret = wm8400->write_dev(wm8400->io_data, reg, num_regs, src);
if (ret != 0)
return -EIO;
return 0;
}
@ -270,14 +264,14 @@ static int wm8400_init(struct wm8400 *wm8400,
dev_set_drvdata(wm8400->dev, wm8400);
/* Check that this is actually a WM8400 */
ret = wm8400->read_dev(wm8400->io_data, WM8400_RESET_ID, 1, &reg);
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 (be16_to_cpu(reg) != reg_data[WM8400_RESET_ID].default_val) {
if (i != reg_data[WM8400_RESET_ID].default_val) {
dev_err(wm8400->dev, "Device is not a WM8400, ID is %x\n",
be16_to_cpu(reg));
reg);
return -ENODEV;
}
@ -285,9 +279,8 @@ static int wm8400_init(struct wm8400 *wm8400,
* is a PMIC we can't reset it safely so initialise the register
* cache from the hardware.
*/
ret = wm8400->read_dev(wm8400->io_data, 0,
ARRAY_SIZE(wm8400->reg_cache),
wm8400->reg_cache);
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;
@ -337,60 +330,13 @@ 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_read(void *io_data, char reg, int count, u16 *dest)
{
struct i2c_client *i2c = io_data;
struct i2c_msg xfer[2];
int ret;
/* Write register */
xfer[0].addr = i2c->addr;
xfer[0].flags = 0;
xfer[0].len = 1;
xfer[0].buf = &reg;
/* Read data */
xfer[1].addr = i2c->addr;
xfer[1].flags = I2C_M_RD;
xfer[1].len = count * sizeof(u16);
xfer[1].buf = (u8 *)dest;
ret = i2c_transfer(i2c->adapter, xfer, 2);
if (ret == 2)
ret = 0;
else if (ret >= 0)
ret = -EIO;
return ret;
}
static int wm8400_i2c_write(void *io_data, char reg, int count, const u16 *src)
{
struct i2c_client *i2c = io_data;
u8 *msg;
int ret;
/* We add 1 byte for device register - ideally I2C would gather. */
msg = kmalloc((count * sizeof(u16)) + 1, GFP_KERNEL);
if (msg == NULL)
return -ENOMEM;
msg[0] = reg;
memcpy(&msg[1], src, count * sizeof(u16));
ret = i2c_master_send(i2c, msg, (count * sizeof(u16)) + 1);
if (ret == (count * 2) + 1)
ret = 0;
else if (ret >= 0)
ret = -EIO;
kfree(msg);
return ret;
}
static int wm8400_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
@ -403,18 +349,23 @@ static int wm8400_i2c_probe(struct i2c_client *i2c,
goto err;
}
wm8400->io_data = i2c;
wm8400->read_dev = wm8400_i2c_read;
wm8400->write_dev = wm8400_i2c_write;
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 struct_err;
goto map_err;
return 0;
map_err:
regmap_exit(wm8400->regmap);
struct_err:
kfree(wm8400);
err:
@ -426,6 +377,7 @@ 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;

7
include/linux/mfd/wm8400-private.h
View File

@ -25,16 +25,15 @@
#include <linux/mutex.h>
#include <linux/platform_device.h>
struct regmap;
#define WM8400_REGISTER_COUNT 0x55
struct wm8400 {
struct device *dev;
int (*read_dev)(void *data, char reg, int count, u16 *dst);
int (*write_dev)(void *data, char reg, int count, const u16 *src);
struct mutex io_lock;
void *io_data;
struct regmap *regmap;
u16 reg_cache[WM8400_REGISTER_COUNT];