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/*
* max8998.c - mfd core driver for the Maxim 8998
*
* Copyright (C) 2009-2010 Samsung Electronics
* Kyungmin Park <kyungmin.park@samsung.com>
* Marek Szyprowski <m.szyprowski@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
*/
#include <linux/err.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/pm_runtime.h>
#include <linux/mutex.h>
#include <linux/mfd/core.h>
#include <linux/mfd/max8998.h>
#include <linux/mfd/max8998-private.h>
#define RTC_I2C_ADDR (0x0c >> 1)
static const struct mfd_cell max8998_devs[] = {
{
.name = "max8998-pmic",
}, {
.name = "max8998-rtc",
}, {
.name = "max8998-battery",
},
};
static const struct mfd_cell lp3974_devs[] = {
{
.name = "lp3974-pmic",
}, {
.name = "lp3974-rtc",
},
};
int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
{
struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
int ret;
mutex_lock(&max8998->iolock);
ret = i2c_smbus_read_byte_data(i2c, reg);
mutex_unlock(&max8998->iolock);
if (ret < 0)
return ret;
ret &= 0xff;
*dest = ret;
return 0;
}
EXPORT_SYMBOL(max8998_read_reg);
int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
{
struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
int ret;
mutex_lock(&max8998->iolock);
ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
mutex_unlock(&max8998->iolock);
if (ret < 0)
return ret;
return 0;
}
EXPORT_SYMBOL(max8998_bulk_read);
int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
{
struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
int ret;
mutex_lock(&max8998->iolock);
ret = i2c_smbus_write_byte_data(i2c, reg, value);
mutex_unlock(&max8998->iolock);
return ret;
}
EXPORT_SYMBOL(max8998_write_reg);
int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
{
struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
int ret;
mutex_lock(&max8998->iolock);
ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
mutex_unlock(&max8998->iolock);
if (ret < 0)
return ret;
return 0;
}
EXPORT_SYMBOL(max8998_bulk_write);
int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
{
struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
int ret;
mutex_lock(&max8998->iolock);
ret = i2c_smbus_read_byte_data(i2c, reg);
if (ret >= 0) {
u8 old_val = ret & 0xff;
u8 new_val = (val & mask) | (old_val & (~mask));
ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
}
mutex_unlock(&max8998->iolock);
return ret;
}
EXPORT_SYMBOL(max8998_update_reg);
#ifdef CONFIG_OF
static struct of_device_id max8998_dt_match[] = {
{ .compatible = "maxim,max8998", .data = (void *)TYPE_MAX8998 },
{ .compatible = "national,lp3974", .data = (void *)TYPE_LP3974 },
{ .compatible = "ti,lp3974", .data = (void *)TYPE_LP3974 },
{},
};
MODULE_DEVICE_TABLE(of, max8998_dt_match);
#endif
/*
* Only the common platform data elements for max8998 are parsed here from the
* device tree. Other sub-modules of max8998 such as pmic, rtc and others have
* to parse their own platform data elements from device tree.
*
* The max8998 platform data structure is instantiated here and the drivers for
* the sub-modules need not instantiate another instance while parsing their
* platform data.
*/
static struct max8998_platform_data *max8998_i2c_parse_dt_pdata(
struct device *dev)
{
struct max8998_platform_data *pd;
pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
if (!pd)
return ERR_PTR(-ENOMEM);
pd->ono = irq_of_parse_and_map(dev->of_node, 1);
/*
* ToDo: the 'wakeup' member in the platform data is more of a linux
* specfic information. Hence, there is no binding for that yet and
* not parsed here.
*/
return pd;
}
static inline unsigned long max8998_i2c_get_driver_data(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
const struct of_device_id *match;
match = of_match_node(max8998_dt_match, i2c->dev.of_node);
return (unsigned long)match->data;
}
return id->driver_data;
}
static int max8998_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct max8998_platform_data *pdata = dev_get_platdata(&i2c->dev);
struct max8998_dev *max8998;
int ret = 0;
max8998 = devm_kzalloc(&i2c->dev, sizeof(struct max8998_dev),
GFP_KERNEL);
if (max8998 == NULL)
return -ENOMEM;
if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
pdata = max8998_i2c_parse_dt_pdata(&i2c->dev);
if (IS_ERR(pdata)) {
ret = PTR_ERR(pdata);
goto err;
}
}
i2c_set_clientdata(i2c, max8998);
max8998->dev = &i2c->dev;
max8998->i2c = i2c;
max8998->irq = i2c->irq;
max8998->type = max8998_i2c_get_driver_data(i2c, id);
max8998->pdata = pdata;
if (pdata) {
max8998->ono = pdata->ono;
max8998->irq_base = pdata->irq_base;
max8998->wakeup = pdata->wakeup;
}
mutex_init(&max8998->iolock);
max8998->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
if (!max8998->rtc) {
dev_err(&i2c->dev, "Failed to allocate I2C device for RTC\n");
return -ENODEV;
}
i2c_set_clientdata(max8998->rtc, max8998);
max8998_irq_init(max8998);
pm_runtime_set_active(max8998->dev);
switch (max8998->type) {
case TYPE_LP3974:
ret = mfd_add_devices(max8998->dev, -1,
lp3974_devs, ARRAY_SIZE(lp3974_devs),
NULL, 0, NULL);
break;
case TYPE_MAX8998:
ret = mfd_add_devices(max8998->dev, -1,
max8998_devs, ARRAY_SIZE(max8998_devs),
NULL, 0, NULL);
break;
default:
ret = -EINVAL;
}
if (ret < 0)
goto err;
device_init_wakeup(max8998->dev, max8998->wakeup);
return ret;
err:
mfd_remove_devices(max8998->dev);
max8998_irq_exit(max8998);
i2c_unregister_device(max8998->rtc);
return ret;
}
static int max8998_i2c_remove(struct i2c_client *i2c)
{
struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
mfd_remove_devices(max8998->dev);
max8998_irq_exit(max8998);
i2c_unregister_device(max8998->rtc);
return 0;
}
static const struct i2c_device_id max8998_i2c_id[]
|