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/*
* I2C access for DA9052 PMICs.
*
* Copyright(c) 2011 Dialog Semiconductor Ltd.
*
* Author: David Dajun Chen <dchen@diasemi.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
*/
#include <linux/device.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/mfd/core.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/mfd/da9052/da9052.h>
#include <linux/mfd/da9052/reg.h>
#ifdef CONFIG_OF
#include <linux/of.h>
#include <linux/of_device.h>
#endif
/* I2C safe register check */
static inline bool i2c_safe_reg(unsigned char reg)
{
switch (reg) {
case DA9052_STATUS_A_REG:
case DA9052_STATUS_B_REG:
case DA9052_STATUS_C_REG:
case DA9052_STATUS_D_REG:
case DA9052_ADC_RES_L_REG:
case DA9052_ADC_RES_H_REG:
case DA9052_VDD_RES_REG:
case DA9052_ICHG_AV_REG:
case DA9052_TBAT_RES_REG:
case DA9052_ADCIN4_RES_REG:
case DA9052_ADCIN5_RES_REG:
case DA9052_ADCIN6_RES_REG:
case DA9052_TJUNC_RES_REG:
case DA9052_TSI_X_MSB_REG:
case DA9052_TSI_Y_MSB_REG:
case DA9052_TSI_LSB_REG:
case DA9052_TSI_Z_MSB_REG:
return true;
default:
return false;
}
}
/*
* There is an issue with DA9052 and DA9053_AA/BA/BB PMIC where the PMIC
* gets lockup up or fails to respond following a system reset.
* This fix is to follow any read or write with a dummy read to a safe
* register.
*/
static int da9052_i2c_fix(struct da9052 *da9052, unsigned char reg)
{
int val;
switch (da9052->chip_id) {
case DA9052:
case DA9053_AA:
case DA9053_BA:
case DA9053_BB:
/* A dummy read to a safe register address. */
if (!i2c_safe_reg(reg))
return regmap_read(da9052->regmap,
DA9052_PARK_REGISTER,
&val);
break;
case DA9053_BC:
default:
/*
* For other chips parking of I2C register
* to a safe place is not required.
*/
break;
}
return 0;
}
/*
* According to errata item 24, multiwrite mode should be avoided
* in order to prevent register data corruption after power-down.
*/
static int da9052_i2c_disable_multiwrite(struct da9052 *da9052)
{
int reg_val, ret;
ret = regmap_read(da9052->regmap, DA9052_CONTROL_B_REG, ®_val);
if (ret < 0)
return ret;
if (!(reg_val & DA9052_CONTROL_B_WRITEMODE)) {
reg_val |= DA9052_CONTROL_B_WRITEMODE;
ret = regmap_write(da9052->regmap, DA9052_CONTROL_B_REG,
reg_val);
if (ret < 0)
return ret;
}
return 0;
}
static const struct i2c_device_id da9052_i2c_id[] = {
{"da9052", DA9052},
{"da9053-aa", DA9053_AA},
{"da9053-ba", DA9053_BA},
{"da9053-bb", DA9053_BB},
{"da9053-bc", DA9053_BC},
{}
};
#ifdef CONFIG_OF
static const struct of_device_id dialog_dt_ids[] = {
{ .compatible = "dlg,da9052", .data = &da9052_i2c_id[0] },
{ .compatible = "dlg,da9053-aa", .data = &da9052_i2c_id[1] },
{ .compatible = "dlg,da9053-ba", .data = &da9052_i2c_id[2] },
{ .compatible = "dlg,da9053-bb", .data = &da9052_i2c_id[3] },
{ .compatible = "dlg,da9053-bc", .data = &da9052_i2c_id[4] },
{ /* sentinel */ }
};
#endif
static int da9052_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct da9052 *da9052;
int ret;
da9052 = devm_kzalloc(&client->dev, sizeof(struct da9052), GFP_KERNEL);
if (!da9052)
return -ENOMEM;
da9052->dev = &client->dev;
da9052->chip_irq = client->irq;
da9052->fix_io = da9052_i2c_fix;
i2c_set_clientdata(client, da9052);
da9052->regmap = devm_regmap_init_i2c(client, &da9052_regmap_config);
if (IS_ERR(da9052->regmap)) {
ret = PTR_ERR(da9052->regmap);
dev_err(&client->dev, "Failed to allocate register map: %d\n",
ret);
return ret;
}
ret = da9052_i2c_disable_multiwrite(da9052);
if (ret < 0)
return ret;
#ifdef CONFIG_OF
if (!id) {
struct device_node *np = client->dev.of_node;
const struct of_device_id *deviceid;
deviceid = of_match_node(dialog_dt_ids, np);
id = deviceid->data;
}
#endif
if (!id) {
ret = -ENODEV;
dev_err(&client->dev, "id is null.\n");
return ret;
}
ret = da9052_device_init(da9052, id->driver_data);
if (ret != 0)
return ret;
return 0;
}
static int da9052_i2c_remove(struct i2c_client *client)
{
struct da9052 *da9052 = i2c_get_clientdata(client);
da9052_device_exit(da9052);
return 0;
}
static struct i2c_driver da9052_i2c_driver = {
.probe = da9052_i2c_probe,
.remove = da9052_i2c_remove,
.id_table = da9052_i2c_id,
.driver = {
.name = "da9052",
.owner = THIS_MODULE,
#ifdef CONFIG_OF
.of_match_table = dialog_dt_ids,
#endif
},
};
static int __init da9052_i2c_init(void)
{
int ret;
ret = i2c_add_driver(&da9052_i2c_driver);
if (ret != 0) {
pr_err("DA9052 I2C registration failed %d\n", ret);
return ret;
}
return 0;
}
subsys_initcall(da9052_i2c_init);
static void __exit da9052_i2c_exit(void)
{
i2c_del_driver(&da9052_i2c_driver);
}
module_exit(da9052_i2c_exit);
MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC");
MODULE_LICENSE("GPL");
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