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linux/drivers/mfd/tps6586x.c
Mike Rapoport c6c1933263 mfd: Add TPS6586x driver 
Add mfd core driver for TPS6586x PMICs family.
The driver provides I/O access for the sub-device drivers and performs
regstration of the sub-devices based on the platform requirements.
In addition it implements GPIOlib interface for the chip GPIOs.

TODO:
        - add interrupt support
        - add platform data for PWM, backlight leds and charger

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Mike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2010-08-12 11:28:12 +02:00

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/*
* Core driver for TI TPS6586x PMIC family
*
* Copyright (c) 2010 CompuLab Ltd.
* Mike Rapoport <mike@compulab.co.il>
*
* Based on da903x.c.
* Copyright (C) 2008 Compulab, Ltd.
* Mike Rapoport <mike@compulab.co.il>
* Copyright (C) 2006-2008 Marvell International Ltd.
* Eric Miao <eric.miao@marvell.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps6586x.h>
/* GPIO control registers */
#define TPS6586X_GPIOSET1 0x5d
#define TPS6586X_GPIOSET2 0x5e
/* device id */
#define TPS6586X_VERSIONCRC 0xcd
#define TPS658621A_VERSIONCRC 0x15
struct tps6586x {
struct mutex lock;
struct device *dev;
struct i2c_client *client;
struct gpio_chip gpio;
};
static inline int __tps6586x_read(struct i2c_client *client,
int reg, uint8_t *val)
{
int ret;
ret = i2c_smbus_read_byte_data(client, reg);
if (ret < 0) {
dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
return ret;
}
*val = (uint8_t)ret;
return 0;
}
static inline int __tps6586x_reads(struct i2c_client *client, int reg,
int len, uint8_t *val)
{
int ret;
ret = i2c_smbus_read_i2c_block_data(client, reg, len, val);
if (ret < 0) {
dev_err(&client->dev, "failed reading from 0x%02x\n", reg);
return ret;
}
return 0;
}
static inline int __tps6586x_write(struct i2c_client *client,
int reg, uint8_t val)
{
int ret;
ret = i2c_smbus_write_byte_data(client, reg, val);
if (ret < 0) {
dev_err(&client->dev, "failed writing 0x%02x to 0x%02x\n",
val, reg);
return ret;
}
return 0;
}
static inline int __tps6586x_writes(struct i2c_client *client, int reg,
int len, uint8_t *val)
{
int ret;
ret = i2c_smbus_write_i2c_block_data(client, reg, len, val);
if (ret < 0) {
dev_err(&client->dev, "failed writings to 0x%02x\n", reg);
return ret;
}
return 0;
}
int tps6586x_write(struct device *dev, int reg, uint8_t val)
{
return __tps6586x_write(to_i2c_client(dev), reg, val);
}
EXPORT_SYMBOL_GPL(tps6586x_write);
int tps6586x_writes(struct device *dev, int reg, int len, uint8_t *val)
{
return __tps6586x_writes(to_i2c_client(dev), reg, len, val);
}
EXPORT_SYMBOL_GPL(tps6586x_writes);
int tps6586x_read(struct device *dev, int reg, uint8_t *val)
{
return __tps6586x_read(to_i2c_client(dev), reg, val);
}
EXPORT_SYMBOL_GPL(tps6586x_read);
int tps6586x_reads(struct device *dev, int reg, int len, uint8_t *val)
{
return __tps6586x_reads(to_i2c_client(dev), reg, len, val);
}
EXPORT_SYMBOL_GPL(tps6586x_reads);
int tps6586x_set_bits(struct device *dev, int reg, uint8_t bit_mask)
{
struct tps6586x *tps6586x = dev_get_drvdata(dev);
uint8_t reg_val;
int ret = 0;
mutex_lock(&tps6586x->lock);
ret = __tps6586x_read(to_i2c_client(dev), reg, &reg_val);
if (ret)
goto out;
if ((reg_val & bit_mask) == 0) {
reg_val |= bit_mask;
ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val);
}
out:
mutex_unlock(&tps6586x->lock);
return ret;
}
EXPORT_SYMBOL_GPL(tps6586x_set_bits);
int tps6586x_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
{
struct tps6586x *tps6586x = dev_get_drvdata(dev);
uint8_t reg_val;
int ret = 0;
mutex_lock(&tps6586x->lock);
ret = __tps6586x_read(to_i2c_client(dev), reg, &reg_val);
if (ret)
goto out;
if (reg_val & bit_mask) {
reg_val &= ~bit_mask;
ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val);
}
out:
mutex_unlock(&tps6586x->lock);
return ret;
}
EXPORT_SYMBOL_GPL(tps6586x_clr_bits);
int tps6586x_update(struct device *dev, int reg, uint8_t val, uint8_t mask)
{
struct tps6586x *tps6586x = dev_get_drvdata(dev);
uint8_t reg_val;
int ret = 0;
mutex_lock(&tps6586x->lock);
ret = __tps6586x_read(tps6586x->client, reg, &reg_val);
if (ret)
goto out;
if ((reg_val & mask) != val) {
reg_val = (reg_val & ~mask) | val;
ret = __tps6586x_write(tps6586x->client, reg, reg_val);
}
out:
mutex_unlock(&tps6586x->lock);
return ret;
}
EXPORT_SYMBOL_GPL(tps6586x_update);
static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)
{
struct tps6586x *tps6586x = container_of(gc, struct tps6586x, gpio);
uint8_t val;
int ret;
ret = __tps6586x_read(tps6586x->client, TPS6586X_GPIOSET2, &val);
if (ret)
return ret;
return !!(val & (1 << offset));
}
static void tps6586x_gpio_set(struct gpio_chip *chip, unsigned offset,
int value)
{
struct tps6586x *tps6586x = container_of(chip, struct tps6586x, gpio);
__tps6586x_write(tps6586x->client, TPS6586X_GPIOSET2,
value << offset);
}
static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset,
int value)
{
struct tps6586x *tps6586x = container_of(gc, struct tps6586x, gpio);
uint8_t val, mask;
tps6586x_gpio_set(gc, offset, value);
val = 0x1 << (offset * 2);
mask = 0x3 << (offset * 2);
return tps6586x_update(tps6586x->dev, TPS6586X_GPIOSET1, val, mask);
}
static void tps6586x_gpio_init(struct tps6586x *tps6586x, int gpio_base)
{
int ret;
if (!gpio_base)
return;
tps6586x->gpio.owner = THIS_MODULE;
tps6586x->gpio.label = tps6586x->client->name;
tps6586x->gpio.dev = tps6586x->dev;
tps6586x->gpio.base = gpio_base;
tps6586x->gpio.ngpio = 4;
tps6586x->gpio.can_sleep = 1;
/* FIXME: add handling of GPIOs as dedicated inputs */
tps6586x->gpio.direction_output = tps6586x_gpio_output;
tps6586x->gpio.set = tps6586x_gpio_set;
tps6586x->gpio.get = tps6586x_gpio_get;
ret = gpiochip_add(&tps6586x->gpio);
if (ret)
dev_warn(tps6586x->dev, "GPIO registration failed: %d\n", ret);
}
static int __remove_subdev(struct device *dev, void *unused)
{
platform_device_unregister(to_platform_device(dev));
return 0;
}
static int tps6586x_remove_subdevs(struct tps6586x *tps6586x)
{
return device_for_each_child(tps6586x->dev, NULL, __remove_subdev);
}
static int __devinit tps6586x_add_subdevs(struct tps6586x *tps6586x,
struct tps6586x_platform_data *pdata)
{
struct tps6586x_subdev_info *subdev;
struct platform_device *pdev;
int i, ret = 0;
for (i = 0; i < pdata->num_subdevs; i++) {
subdev = &pdata->subdevs[i];
pdev = platform_device_alloc(subdev->name, subdev->id);
pdev->dev.parent = tps6586x->dev;
pdev->dev.platform_data = subdev->platform_data;
ret = platform_device_add(pdev);
if (ret)
goto failed;
}
return 0;
failed:
tps6586x_remove_subdevs(tps6586x);
return ret;
}
static int __devinit tps6586x_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct tps6586x_platform_data *pdata = client->dev.platform_data;
struct tps6586x *tps6586x;
int ret;
if (!pdata) {
dev_err(&client->dev, "tps6586x requires platform data\n");
return -ENOTSUPP;
}
ret = i2c_smbus_read_byte_data(client, TPS6586X_VERSIONCRC);
if (ret < 0) {
dev_err(&client->dev, "Chip ID read failed: %d\n", ret);
return -EIO;
}
if (ret != TPS658621A_VERSIONCRC) {
dev_err(&client->dev, "Unsupported chip ID: %x\n", ret);
return -ENODEV;
}
tps6586x = kzalloc(sizeof(struct tps6586x), GFP_KERNEL);
if (tps6586x == NULL)
return -ENOMEM;
tps6586x->client = client;
tps6586x->dev = &client->dev;
i2c_set_clientdata(client, tps6586x);
mutex_init(&tps6586x->lock);
ret = tps6586x_add_subdevs(tps6586x, pdata);
if (ret) {
dev_err(&client->dev, "add devices failed: %d\n", ret);
goto err_add_devs;
}
tps6586x_gpio_init(tps6586x, pdata->gpio_base);
return 0;
err_add_devs:
kfree(tps6586x);
return ret;
}
static int __devexit tps6586x_i2c_remove(struct i2c_client *client)
{
return 0;
}
static const struct i2c_device_id tps6586x_id_table[] = {
{ "tps6586x", 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, tps6586x_id_table);
static struct i2c_driver tps6586x_driver = {
.driver = {
.name = "tps6586x",
.owner = THIS_MODULE,
},
.probe = tps6586x_i2c_probe,
.remove = __devexit_p(tps6586x_i2c_remove),
.id_table = tps6586x_id_table,
};
static int __init tps6586x_init(void)
{
return i2c_add_driver(&tps6586x_driver);
}
subsys_initcall(tps6586x_init);
static void __exit tps6586x_exit(void)
{
i2c_del_driver(&tps6586x_driver);
}
module_exit(tps6586x_exit);
MODULE_DESCRIPTION("TPS6586X core driver");
MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
MODULE_LICENSE("GPL");
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