278 lines
6.4 KiB
C
278 lines
6.4 KiB
C
/*
|
|
* I2C driver for Maxim MAX8925
|
|
*
|
|
* Copyright (C) 2009 Marvell International Ltd.
|
|
* Haojian Zhuang <haojian.zhuang@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/platform_device.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/mfd/max8925.h>
|
|
#include <linux/slab.h>
|
|
|
|
#define RTC_I2C_ADDR 0x68
|
|
#define ADC_I2C_ADDR 0x47
|
|
|
|
static inline int max8925_read_device(struct i2c_client *i2c,
|
|
int reg, int bytes, void *dest)
|
|
{
|
|
int ret;
|
|
|
|
if (bytes > 1)
|
|
ret = i2c_smbus_read_i2c_block_data(i2c, reg, bytes, dest);
|
|
else {
|
|
ret = i2c_smbus_read_byte_data(i2c, reg);
|
|
if (ret < 0)
|
|
return ret;
|
|
*(unsigned char *)dest = (unsigned char)ret;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static inline int max8925_write_device(struct i2c_client *i2c,
|
|
int reg, int bytes, void *src)
|
|
{
|
|
unsigned char buf[9];
|
|
int ret;
|
|
|
|
buf[0] = (unsigned char)reg;
|
|
memcpy(&buf[1], src, bytes);
|
|
|
|
ret = i2c_master_send(i2c, buf, bytes + 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
return 0;
|
|
}
|
|
|
|
int max8925_reg_read(struct i2c_client *i2c, int reg)
|
|
{
|
|
struct max8925_chip *chip = i2c_get_clientdata(i2c);
|
|
unsigned char data = 0;
|
|
int ret;
|
|
|
|
mutex_lock(&chip->io_lock);
|
|
ret = max8925_read_device(i2c, reg, 1, &data);
|
|
mutex_unlock(&chip->io_lock);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
else
|
|
return (int)data;
|
|
}
|
|
EXPORT_SYMBOL(max8925_reg_read);
|
|
|
|
int max8925_reg_write(struct i2c_client *i2c, int reg,
|
|
unsigned char data)
|
|
{
|
|
struct max8925_chip *chip = i2c_get_clientdata(i2c);
|
|
int ret;
|
|
|
|
mutex_lock(&chip->io_lock);
|
|
ret = max8925_write_device(i2c, reg, 1, &data);
|
|
mutex_unlock(&chip->io_lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(max8925_reg_write);
|
|
|
|
int max8925_bulk_read(struct i2c_client *i2c, int reg,
|
|
int count, unsigned char *buf)
|
|
{
|
|
struct max8925_chip *chip = i2c_get_clientdata(i2c);
|
|
int ret;
|
|
|
|
mutex_lock(&chip->io_lock);
|
|
ret = max8925_read_device(i2c, reg, count, buf);
|
|
mutex_unlock(&chip->io_lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(max8925_bulk_read);
|
|
|
|
int max8925_bulk_write(struct i2c_client *i2c, int reg,
|
|
int count, unsigned char *buf)
|
|
{
|
|
struct max8925_chip *chip = i2c_get_clientdata(i2c);
|
|
int ret;
|
|
|
|
mutex_lock(&chip->io_lock);
|
|
ret = max8925_write_device(i2c, reg, count, buf);
|
|
mutex_unlock(&chip->io_lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(max8925_bulk_write);
|
|
|
|
int max8925_set_bits(struct i2c_client *i2c, int reg,
|
|
unsigned char mask, unsigned char data)
|
|
{
|
|
struct max8925_chip *chip = i2c_get_clientdata(i2c);
|
|
unsigned char value;
|
|
int ret;
|
|
|
|
mutex_lock(&chip->io_lock);
|
|
ret = max8925_read_device(i2c, reg, 1, &value);
|
|
if (ret < 0)
|
|
goto out;
|
|
value &= ~mask;
|
|
value |= data;
|
|
ret = max8925_write_device(i2c, reg, 1, &value);
|
|
out:
|
|
mutex_unlock(&chip->io_lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(max8925_set_bits);
|
|
|
|
|
|
static const struct i2c_device_id max8925_id_table[] = {
|
|
{ "max8925", 0 },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, max8925_id_table);
|
|
|
|
static int max8925_dt_init(struct device_node *np, struct device *dev,
|
|
struct max8925_platform_data *pdata)
|
|
{
|
|
int ret;
|
|
|
|
ret = of_property_read_u32(np, "maxim,tsc-irq", &pdata->tsc_irq);
|
|
if (ret) {
|
|
dev_err(dev, "Not found maxim,tsc-irq property\n");
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int max8925_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct max8925_platform_data *pdata = dev_get_platdata(&client->dev);
|
|
static struct max8925_chip *chip;
|
|
struct device_node *node = client->dev.of_node;
|
|
|
|
if (node && !pdata) {
|
|
/* parse DT to get platform data */
|
|
pdata = devm_kzalloc(&client->dev,
|
|
sizeof(struct max8925_platform_data),
|
|
GFP_KERNEL);
|
|
if (!pdata)
|
|
return -ENOMEM;
|
|
|
|
if (max8925_dt_init(node, &client->dev, pdata))
|
|
return -EINVAL;
|
|
} else if (!pdata) {
|
|
pr_info("%s: platform data is missing\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
chip = devm_kzalloc(&client->dev,
|
|
sizeof(struct max8925_chip), GFP_KERNEL);
|
|
if (chip == NULL)
|
|
return -ENOMEM;
|
|
chip->i2c = client;
|
|
chip->dev = &client->dev;
|
|
i2c_set_clientdata(client, chip);
|
|
dev_set_drvdata(chip->dev, chip);
|
|
mutex_init(&chip->io_lock);
|
|
|
|
chip->rtc = i2c_new_dummy(chip->i2c->adapter, RTC_I2C_ADDR);
|
|
if (!chip->rtc) {
|
|
dev_err(chip->dev, "Failed to allocate I2C device for RTC\n");
|
|
return -ENODEV;
|
|
}
|
|
i2c_set_clientdata(chip->rtc, chip);
|
|
|
|
chip->adc = i2c_new_dummy(chip->i2c->adapter, ADC_I2C_ADDR);
|
|
if (!chip->adc) {
|
|
dev_err(chip->dev, "Failed to allocate I2C device for ADC\n");
|
|
i2c_unregister_device(chip->rtc);
|
|
return -ENODEV;
|
|
}
|
|
i2c_set_clientdata(chip->adc, chip);
|
|
|
|
device_init_wakeup(&client->dev, 1);
|
|
|
|
max8925_device_init(chip, pdata);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int max8925_remove(struct i2c_client *client)
|
|
{
|
|
struct max8925_chip *chip = i2c_get_clientdata(client);
|
|
|
|
max8925_device_exit(chip);
|
|
i2c_unregister_device(chip->adc);
|
|
i2c_unregister_device(chip->rtc);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int max8925_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *client = container_of(dev, struct i2c_client, dev);
|
|
struct max8925_chip *chip = i2c_get_clientdata(client);
|
|
|
|
if (device_may_wakeup(dev) && chip->wakeup_flag)
|
|
enable_irq_wake(chip->core_irq);
|
|
return 0;
|
|
}
|
|
|
|
static int max8925_resume(struct device *dev)
|
|
{
|
|
struct i2c_client *client = container_of(dev, struct i2c_client, dev);
|
|
struct max8925_chip *chip = i2c_get_clientdata(client);
|
|
|
|
if (device_may_wakeup(dev) && chip->wakeup_flag)
|
|
disable_irq_wake(chip->core_irq);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(max8925_pm_ops, max8925_suspend, max8925_resume);
|
|
|
|
static const struct of_device_id max8925_dt_ids[] = {
|
|
{ .compatible = "maxim,max8925", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, max8925_dt_ids);
|
|
|
|
static struct i2c_driver max8925_driver = {
|
|
.driver = {
|
|
.name = "max8925",
|
|
.owner = THIS_MODULE,
|
|
.pm = &max8925_pm_ops,
|
|
.of_match_table = max8925_dt_ids,
|
|
},
|
|
.probe = max8925_probe,
|
|
.remove = max8925_remove,
|
|
.id_table = max8925_id_table,
|
|
};
|
|
|
|
static int __init max8925_i2c_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = i2c_add_driver(&max8925_driver);
|
|
if (ret != 0)
|
|
pr_err("Failed to register MAX8925 I2C driver: %d\n", ret);
|
|
|
|
return ret;
|
|
}
|
|
subsys_initcall(max8925_i2c_init);
|
|
|
|
static void __exit max8925_i2c_exit(void)
|
|
{
|
|
i2c_del_driver(&max8925_driver);
|
|
}
|
|
module_exit(max8925_i2c_exit);
|
|
|
|
MODULE_DESCRIPTION("I2C Driver for Maxim 8925");
|
|
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
|
|
MODULE_LICENSE("GPL");
|