mirror of
https://github.com/torvalds/linux.git
synced 2024-11-15 00:21:59 +00:00
1b5420e1f5
Signed-off-by: Geliang Tang <geliangtang@163.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
404 lines
10 KiB
C
404 lines
10 KiB
C
/*
|
|
* 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 const 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[] = {
|
|
{ "max8998", TYPE_MAX8998 },
|
|
{ "lp3974", TYPE_LP3974},
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, max8998_i2c_id);
|
|
|
|
static int max8998_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *i2c = to_i2c_client(dev);
|
|
struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
|
|
|
|
if (device_may_wakeup(dev))
|
|
irq_set_irq_wake(max8998->irq, 1);
|
|
return 0;
|
|
}
|
|
|
|
static int max8998_resume(struct device *dev)
|
|
{
|
|
struct i2c_client *i2c = to_i2c_client(dev);
|
|
struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
|
|
|
|
if (device_may_wakeup(dev))
|
|
irq_set_irq_wake(max8998->irq, 0);
|
|
/*
|
|
* In LP3974, if IRQ registers are not "read & clear"
|
|
* when it's set during sleep, the interrupt becomes
|
|
* disabled.
|
|
*/
|
|
return max8998_irq_resume(i2c_get_clientdata(i2c));
|
|
}
|
|
|
|
struct max8998_reg_dump {
|
|
u8 addr;
|
|
u8 val;
|
|
};
|
|
#define SAVE_ITEM(x) { .addr = (x), .val = 0x0, }
|
|
static struct max8998_reg_dump max8998_dump[] = {
|
|
SAVE_ITEM(MAX8998_REG_IRQM1),
|
|
SAVE_ITEM(MAX8998_REG_IRQM2),
|
|
SAVE_ITEM(MAX8998_REG_IRQM3),
|
|
SAVE_ITEM(MAX8998_REG_IRQM4),
|
|
SAVE_ITEM(MAX8998_REG_STATUSM1),
|
|
SAVE_ITEM(MAX8998_REG_STATUSM2),
|
|
SAVE_ITEM(MAX8998_REG_CHGR1),
|
|
SAVE_ITEM(MAX8998_REG_CHGR2),
|
|
SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
|
|
SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
|
|
SAVE_ITEM(MAX8998_REG_BUCK_ACTIVE_DISCHARGE3),
|
|
SAVE_ITEM(MAX8998_REG_ONOFF1),
|
|
SAVE_ITEM(MAX8998_REG_ONOFF2),
|
|
SAVE_ITEM(MAX8998_REG_ONOFF3),
|
|
SAVE_ITEM(MAX8998_REG_ONOFF4),
|
|
SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE1),
|
|
SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE2),
|
|
SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE3),
|
|
SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE4),
|
|
SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE1),
|
|
SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE2),
|
|
SAVE_ITEM(MAX8998_REG_LDO2_LDO3),
|
|
SAVE_ITEM(MAX8998_REG_LDO4),
|
|
SAVE_ITEM(MAX8998_REG_LDO5),
|
|
SAVE_ITEM(MAX8998_REG_LDO6),
|
|
SAVE_ITEM(MAX8998_REG_LDO7),
|
|
SAVE_ITEM(MAX8998_REG_LDO8_LDO9),
|
|
SAVE_ITEM(MAX8998_REG_LDO10_LDO11),
|
|
SAVE_ITEM(MAX8998_REG_LDO12),
|
|
SAVE_ITEM(MAX8998_REG_LDO13),
|
|
SAVE_ITEM(MAX8998_REG_LDO14),
|
|
SAVE_ITEM(MAX8998_REG_LDO15),
|
|
SAVE_ITEM(MAX8998_REG_LDO16),
|
|
SAVE_ITEM(MAX8998_REG_LDO17),
|
|
SAVE_ITEM(MAX8998_REG_BKCHR),
|
|
SAVE_ITEM(MAX8998_REG_LBCNFG1),
|
|
SAVE_ITEM(MAX8998_REG_LBCNFG2),
|
|
};
|
|
/* Save registers before hibernation */
|
|
static int max8998_freeze(struct device *dev)
|
|
{
|
|
struct i2c_client *i2c = to_i2c_client(dev);
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
|
|
max8998_read_reg(i2c, max8998_dump[i].addr,
|
|
&max8998_dump[i].val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Restore registers after hibernation */
|
|
static int max8998_restore(struct device *dev)
|
|
{
|
|
struct i2c_client *i2c = to_i2c_client(dev);
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
|
|
max8998_write_reg(i2c, max8998_dump[i].addr,
|
|
max8998_dump[i].val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops max8998_pm = {
|
|
.suspend = max8998_suspend,
|
|
.resume = max8998_resume,
|
|
.freeze = max8998_freeze,
|
|
.restore = max8998_restore,
|
|
};
|
|
|
|
static struct i2c_driver max8998_i2c_driver = {
|
|
.driver = {
|
|
.name = "max8998",
|
|
.pm = &max8998_pm,
|
|
.of_match_table = of_match_ptr(max8998_dt_match),
|
|
},
|
|
.probe = max8998_i2c_probe,
|
|
.remove = max8998_i2c_remove,
|
|
.id_table = max8998_i2c_id,
|
|
};
|
|
|
|
static int __init max8998_i2c_init(void)
|
|
{
|
|
return i2c_add_driver(&max8998_i2c_driver);
|
|
}
|
|
/* init early so consumer devices can complete system boot */
|
|
subsys_initcall(max8998_i2c_init);
|
|
|
|
static void __exit max8998_i2c_exit(void)
|
|
{
|
|
i2c_del_driver(&max8998_i2c_driver);
|
|
}
|
|
module_exit(max8998_i2c_exit);
|
|
|
|
MODULE_DESCRIPTION("MAXIM 8998 multi-function core driver");
|
|
MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
|
|
MODULE_LICENSE("GPL");
|