mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 06:34:11 +08:00
c6c1933263
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>
376 lines
8.3 KiB
C
376 lines
8.3 KiB
C
/*
|
|
* 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, ®_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, ®_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, ®_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");
|
|
|