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/*
* I2C driver for Marvell 88PM80x
*
* Copyright (C) 2012 Marvell International Ltd.
* Haojian Zhuang <haojian.zhuang@marvell.com>
* Joseph(Yossi) Hanin <yhanin@marvell.com>
* Qiao Zhou <zhouqiao@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/i2c.h>
#include <linux/mfd/88pm80x.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/err.h>
/* 88pm80x chips have same definition for chip id register. */
#define PM80X_CHIP_ID (0x00)
#define PM80X_CHIP_ID_NUM(x) (((x) >> 5) & 0x7)
#define PM80X_CHIP_ID_REVISION(x) ((x) & 0x1F)
struct pm80x_chip_mapping {
unsigned int id;
int type;
};
static struct pm80x_chip_mapping chip_mapping[] = {
/* 88PM800 chip id number */
{0x3, CHIP_PM800},
/* 88PM805 chip id number */
{0x0, CHIP_PM805},
};
/*
* workaround: some registers needed by pm805 are defined in pm800, so
* need to use this global variable to maintain the relation between
* pm800 and pm805. would remove it after HW chip fixes the issue.
*/
static struct pm80x_chip *g_pm80x_chip;
const struct regmap_config pm80x_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
EXPORT_SYMBOL_GPL(pm80x_regmap_config);
int pm80x_init(struct i2c_client *client)
{
struct pm80x_chip *chip;
struct regmap *map;
unsigned int val;
int i, ret = 0;
chip =
devm_kzalloc(&client->dev, sizeof(struct pm80x_chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
map = devm_regmap_init_i2c(client, &pm80x_regmap_config);
if (IS_ERR(map)) {
ret = PTR_ERR(map);
dev_err(&client->dev, "Failed to allocate register map: %d
",
ret);
return ret;
}
chip->client = client;
chip->regmap = map;
chip->irq = client->irq;
chip->dev = &client->dev;
dev_set_drvdata(chip->dev, chip);
i2c_set_clientdata(chip->client, chip);
ret = regmap_read(chip->regmap, PM80X_CHIP_ID, &val);
if (ret < 0) {
dev_err(chip->dev, "Failed to read CHIP ID: %d
", ret);
return ret;
}
for (i = 0; i < ARRAY_SIZE(chip_mapping); i++) {
if (chip_mapping[i].id == PM80X_CHIP_ID_NUM(val)) {
chip->type = chip_mapping[i].type;
break;
}
}
if (i == ARRAY_SIZE(chip_mapping)) {
dev_err(chip->dev,
"Failed to detect Marvell 88PM800:ChipID[0x%x]
", val);
return -EINVAL;
}
device_init_wakeup(&client->dev, 1);
/*
* workaround: set g_pm80x_chip to the first probed chip. if the
* second chip is probed, just point to the companion to each
* other so that pm805 can access those specific register. would
* remove it after HW chip fixes the issue.
*/
if (!g_pm80x_chip)
g_pm80x_chip = chip;
else {
chip->companion = g_pm80x_chip->client;
g_pm80x_chip->companion = chip->client;
}
return 0;
}
EXPORT_SYMBOL_GPL(pm80x_init);
int pm80x_deinit(void)
{
/*
* workaround: clear the dependency between pm800 and pm805.
* would remove it after HW chip fixes the issue.
*/
if (g_pm80x_chip->companion)
g_pm80x_chip->companion = NULL;
else
g_pm80x_chip = NULL;
return 0;
}
EXPORT_SYMBOL_GPL(pm80x_deinit);
#ifdef CONFIG_PM_SLEEP
static int pm80x_suspend(struct device *dev)
{
struct i2c_client *client = container_of(dev, struct i2c_client, dev);
struct pm80x_chip *chip = i2c_get_clientdata(client);
if (chip && chip->wu_flag)
if (device_may_wakeup(chip->dev))
enable_irq_wake(chip->irq);
return 0;
}
static int pm80x_resume(struct device *dev)
{
struct i2c_client *client = container_of(dev, struct i2c_client, dev);
struct pm80x_chip *chip = i2c_get_clientdata(client);
if (chip && chip->wu_flag)
if (device_may_wakeup(chip->dev))
disable_irq_wake(chip->irq);
return 0;
}
#endif
SIMPLE_DEV_PM_OPS(pm80x_pm_ops, pm80x_suspend, pm80x_resume);
EXPORT_SYMBOL_GPL(pm80x_pm_ops);
MODULE_DESCRIPTION("I2C Driver for Marvell 88PM80x");
MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
MODULE_LICENSE("GPL");
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