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/*
* max77686.c - mfd core driver for the Maxim 77686
*
* Copyright (C) 2012 Samsung Electronics
* Chiwoong Byun <woong.byun@smasung.com>
* Jonghwa Lee <jonghwa3.lee@samsung.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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* This driver is based on max8997.c
*/
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/pm_runtime.h>
#include <linux/module.h>
#include <linux/mfd/core.h>
#include <linux/mfd/max77686.h>
#include <linux/mfd/max77686-private.h>
#include <linux/err.h>
#define I2C_ADDR_RTC (0x0C >> 1)
static struct mfd_cell max77686_devs[] = {
{ .name = "max77686-pmic", },
{ .name = "max77686-rtc", },
};
static struct regmap_config max77686_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
#ifdef CONFIG_OF
static struct of_device_id max77686_pmic_dt_match[] = {
{.compatible = "maxim,max77686", .data = NULL},
{},
};
static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
*dev)
{
struct max77686_platform_data *pd;
pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
if (!pd) {
dev_err(dev, "could not allocate memory for pdata\n");
return NULL;
}
dev->platform_data = pd;
return pd;
}
#else
static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
*dev)
{
return 0;
}
#endif
static int max77686_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct max77686_dev *max77686 = NULL;
struct max77686_platform_data *pdata = i2c->dev.platform_data;
unsigned int data;
int ret = 0;
if (i2c->dev.of_node)
pdata = max77686_i2c_parse_dt_pdata(&i2c->dev);
if (!pdata) {
ret = -EIO;
dev_err(&i2c->dev, "No platform data found.\n");
goto err;
}
max77686 = kzalloc(sizeof(struct max77686_dev), GFP_KERNEL);
if (max77686 == NULL)
return -ENOMEM;
i2c_set_clientdata(i2c, max77686);
max77686->dev = &i2c->dev;
max77686->i2c = i2c;
max77686->type = id->driver_data;
max77686->wakeup = pdata->wakeup;
max77686->irq_gpio = pdata->irq_gpio;
max77686->irq = i2c->irq;
max77686->regmap = devm_regmap_init_i2c(i2c, &max77686_regmap_config);
if (IS_ERR(max77686->regmap)) {
ret = PTR_ERR(max77686->regmap);
dev_err(max77686->dev, "Failed to allocate register map: %d\n",
ret);
kfree(max77686);
return ret;
}
if (regmap_read(max77686->regmap,
MAX77686_REG_DEVICE_ID, &data) < 0) {
dev_err(max77686->dev,
"device not found on this channel (this is not an error)\n");
ret = -ENODEV;
goto err;
} else
dev_info(max77686->dev, "device found\n");
max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC);
i2c_set_clientdata(max77686->rtc, max77686);
max77686_irq_init(max77686);
ret = mfd_add_devices(max77686->dev, -1, max77686_devs,
ARRAY_SIZE(max77686_devs), NULL, 0, NULL);
if (ret < 0)
goto err_mfd;
return ret;
err_mfd:
mfd_remove_devices(max77686->dev);
i2c_unregister_device(max77686->rtc);
err:
kfree(max77686);
return ret;
}
static int max77686_i2c_remove(struct i2c_client *i2c)
{
struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
mfd_remove_devices(max77686->dev);
i2c_unregister_device(max77686->rtc);
kfree(max77686);
return 0;
}
static const struct i2c_device_id max77686_i2c_id[] = {
{ "max77686", TYPE_MAX77686 },
{ }
};
MODULE_DEVICE_TABLE(i2c, max77686_i2c_id);
static struct i2c_driver max77686_i2c_driver = {
.driver = {
.name = "max77686",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(max77686_pmic_dt_match),
},
.probe = max77686_i2c_probe,
.remove = max77686_i2c_remove,
.id_table = max77686_i2c_id,
};
static int __init max77686_i2c_init(void)
{
return i2c_add_driver(&max77686_i2c_driver);
}
/* init early so consumer devices can complete system boot */
subsys_initcall(max77686_i2c_init);
static void __exit max77686_i2c_exit(void)
{
i2c_del_driver(&max77686_i2c_driver);
}
module_exit(max77686_i2c_exit);
MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver");
MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
MODULE_LICENSE("GPL");
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