297 lines
8.2 KiB
C
Executable file
297 lines
8.2 KiB
C
Executable file
/*
|
|
* max77686.c - mfd core driver for the Maxim 77686/802
|
|
*
|
|
* Copyright (C) 2012 Samsung Electronics
|
|
* Chiwoong Byun <woong.byun@samsung.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/irq.h>
|
|
#include <linux/interrupt.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>
|
|
#include <linux/of.h>
|
|
#include <linux/of_device.h>
|
|
|
|
static const struct mfd_cell max77686_devs[] = {
|
|
{ .name = "max77686-pmic", },
|
|
{ .name = "max77686-rtc", },
|
|
{ .name = "max77686-clk", },
|
|
};
|
|
|
|
static const struct mfd_cell max77802_devs[] = {
|
|
{ .name = "max77802-pmic", },
|
|
{ .name = "max77802-clk", },
|
|
{ .name = "max77802-rtc", },
|
|
};
|
|
|
|
static bool max77802_pmic_is_accessible_reg(struct device *dev,
|
|
unsigned int reg)
|
|
{
|
|
return reg < MAX77802_REG_PMIC_END;
|
|
}
|
|
|
|
static bool max77802_rtc_is_accessible_reg(struct device *dev,
|
|
unsigned int reg)
|
|
{
|
|
return (reg >= MAX77802_RTC_INT && reg < MAX77802_RTC_END);
|
|
}
|
|
|
|
static bool max77802_is_accessible_reg(struct device *dev, unsigned int reg)
|
|
{
|
|
return (max77802_pmic_is_accessible_reg(dev, reg) ||
|
|
max77802_rtc_is_accessible_reg(dev, reg));
|
|
}
|
|
|
|
static bool max77802_pmic_is_precious_reg(struct device *dev, unsigned int reg)
|
|
{
|
|
return (reg == MAX77802_REG_INTSRC || reg == MAX77802_REG_INT1 ||
|
|
reg == MAX77802_REG_INT2);
|
|
}
|
|
|
|
static bool max77802_rtc_is_precious_reg(struct device *dev, unsigned int reg)
|
|
{
|
|
return (reg == MAX77802_RTC_INT ||
|
|
reg == MAX77802_RTC_UPDATE0 ||
|
|
reg == MAX77802_RTC_UPDATE1);
|
|
}
|
|
|
|
static bool max77802_is_precious_reg(struct device *dev, unsigned int reg)
|
|
{
|
|
return (max77802_pmic_is_precious_reg(dev, reg) ||
|
|
max77802_rtc_is_precious_reg(dev, reg));
|
|
}
|
|
|
|
static bool max77802_pmic_is_volatile_reg(struct device *dev, unsigned int reg)
|
|
{
|
|
return (max77802_is_precious_reg(dev, reg) ||
|
|
reg == MAX77802_REG_STATUS1 || reg == MAX77802_REG_STATUS2 ||
|
|
reg == MAX77802_REG_PWRON);
|
|
}
|
|
|
|
static bool max77802_rtc_is_volatile_reg(struct device *dev, unsigned int reg)
|
|
{
|
|
return (max77802_rtc_is_precious_reg(dev, reg) ||
|
|
reg == MAX77802_RTC_SEC ||
|
|
reg == MAX77802_RTC_MIN ||
|
|
reg == MAX77802_RTC_HOUR ||
|
|
reg == MAX77802_RTC_WEEKDAY ||
|
|
reg == MAX77802_RTC_MONTH ||
|
|
reg == MAX77802_RTC_YEAR ||
|
|
reg == MAX77802_RTC_DATE);
|
|
}
|
|
|
|
static bool max77802_is_volatile_reg(struct device *dev, unsigned int reg)
|
|
{
|
|
return (max77802_pmic_is_volatile_reg(dev, reg) ||
|
|
max77802_rtc_is_volatile_reg(dev, reg));
|
|
}
|
|
|
|
static const struct regmap_config max77686_regmap_config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
};
|
|
|
|
static const struct regmap_config max77802_regmap_config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
.writeable_reg = max77802_is_accessible_reg,
|
|
.readable_reg = max77802_is_accessible_reg,
|
|
.precious_reg = max77802_is_precious_reg,
|
|
.volatile_reg = max77802_is_volatile_reg,
|
|
.name = "max77802-pmic",
|
|
.cache_type = REGCACHE_RBTREE,
|
|
};
|
|
|
|
static const struct regmap_irq max77686_irqs[] = {
|
|
/* INT1 interrupts */
|
|
{ .reg_offset = 0, .mask = MAX77686_INT1_PWRONF_MSK, },
|
|
{ .reg_offset = 0, .mask = MAX77686_INT1_PWRONR_MSK, },
|
|
{ .reg_offset = 0, .mask = MAX77686_INT1_JIGONBF_MSK, },
|
|
{ .reg_offset = 0, .mask = MAX77686_INT1_JIGONBR_MSK, },
|
|
{ .reg_offset = 0, .mask = MAX77686_INT1_ACOKBF_MSK, },
|
|
{ .reg_offset = 0, .mask = MAX77686_INT1_ACOKBR_MSK, },
|
|
{ .reg_offset = 0, .mask = MAX77686_INT1_ONKEY1S_MSK, },
|
|
{ .reg_offset = 0, .mask = MAX77686_INT1_MRSTB_MSK, },
|
|
/* INT2 interrupts */
|
|
{ .reg_offset = 1, .mask = MAX77686_INT2_140C_MSK, },
|
|
{ .reg_offset = 1, .mask = MAX77686_INT2_120C_MSK, },
|
|
};
|
|
|
|
static const struct regmap_irq_chip max77686_irq_chip = {
|
|
.name = "max77686-pmic",
|
|
.status_base = MAX77686_REG_INT1,
|
|
.mask_base = MAX77686_REG_INT1MSK,
|
|
.num_regs = 2,
|
|
.irqs = max77686_irqs,
|
|
.num_irqs = ARRAY_SIZE(max77686_irqs),
|
|
};
|
|
|
|
static const struct regmap_irq_chip max77802_irq_chip = {
|
|
.name = "max77802-pmic",
|
|
.status_base = MAX77802_REG_INT1,
|
|
.mask_base = MAX77802_REG_INT1MSK,
|
|
.num_regs = 2,
|
|
.irqs = max77686_irqs, /* same masks as 77686 */
|
|
.num_irqs = ARRAY_SIZE(max77686_irqs),
|
|
};
|
|
|
|
static const struct of_device_id max77686_pmic_dt_match[] = {
|
|
{
|
|
.compatible = "maxim,max77686",
|
|
.data = (void *)TYPE_MAX77686,
|
|
},
|
|
{
|
|
.compatible = "maxim,max77802",
|
|
.data = (void *)TYPE_MAX77802,
|
|
},
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, max77686_pmic_dt_match);
|
|
|
|
static int max77686_i2c_probe(struct i2c_client *i2c)
|
|
{
|
|
struct max77686_dev *max77686 = NULL;
|
|
unsigned int data;
|
|
int ret = 0;
|
|
const struct regmap_config *config;
|
|
const struct regmap_irq_chip *irq_chip;
|
|
const struct mfd_cell *cells;
|
|
int n_devs;
|
|
|
|
max77686 = devm_kzalloc(&i2c->dev,
|
|
sizeof(struct max77686_dev), GFP_KERNEL);
|
|
if (!max77686)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(i2c, max77686);
|
|
max77686->type = (unsigned long)of_device_get_match_data(&i2c->dev);
|
|
max77686->dev = &i2c->dev;
|
|
max77686->i2c = i2c;
|
|
|
|
max77686->irq = i2c->irq;
|
|
|
|
if (max77686->type == TYPE_MAX77686) {
|
|
config = &max77686_regmap_config;
|
|
irq_chip = &max77686_irq_chip;
|
|
cells = max77686_devs;
|
|
n_devs = ARRAY_SIZE(max77686_devs);
|
|
} else {
|
|
config = &max77802_regmap_config;
|
|
irq_chip = &max77802_irq_chip;
|
|
cells = max77802_devs;
|
|
n_devs = ARRAY_SIZE(max77802_devs);
|
|
}
|
|
|
|
max77686->regmap = devm_regmap_init_i2c(i2c, config);
|
|
if (IS_ERR(max77686->regmap)) {
|
|
ret = PTR_ERR(max77686->regmap);
|
|
dev_err(max77686->dev, "Failed to allocate register map: %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = regmap_read(max77686->regmap, MAX77686_REG_DEVICE_ID, &data);
|
|
if (ret < 0) {
|
|
dev_err(max77686->dev,
|
|
"device not found on this channel (this is not an error)\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
ret = devm_regmap_add_irq_chip(&i2c->dev, max77686->regmap,
|
|
max77686->irq,
|
|
IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
|
|
IRQF_SHARED, 0, irq_chip,
|
|
&max77686->irq_data);
|
|
if (ret < 0) {
|
|
dev_err(&i2c->dev, "failed to add PMIC irq chip: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = devm_mfd_add_devices(max77686->dev, -1, cells, n_devs, NULL,
|
|
0, NULL);
|
|
if (ret < 0) {
|
|
dev_err(&i2c->dev, "failed to add MFD devices: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int max77686_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *i2c = to_i2c_client(dev);
|
|
struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
|
|
|
|
if (device_may_wakeup(dev))
|
|
enable_irq_wake(max77686->irq);
|
|
|
|
/*
|
|
* IRQ must be disabled during suspend because if it happens
|
|
* while suspended it will be handled before resuming I2C.
|
|
*
|
|
* When device is woken up from suspend (e.g. by RTC wake alarm),
|
|
* an interrupt occurs before resuming I2C bus controller.
|
|
* Interrupt handler tries to read registers but this read
|
|
* will fail because I2C is still suspended.
|
|
*/
|
|
disable_irq(max77686->irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int max77686_resume(struct device *dev)
|
|
{
|
|
struct i2c_client *i2c = to_i2c_client(dev);
|
|
struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
|
|
|
|
if (device_may_wakeup(dev))
|
|
disable_irq_wake(max77686->irq);
|
|
|
|
enable_irq(max77686->irq);
|
|
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
static SIMPLE_DEV_PM_OPS(max77686_pm, max77686_suspend, max77686_resume);
|
|
|
|
static struct i2c_driver max77686_i2c_driver = {
|
|
.driver = {
|
|
.name = "max77686",
|
|
.pm = &max77686_pm,
|
|
.of_match_table = of_match_ptr(max77686_pmic_dt_match),
|
|
},
|
|
.probe_new = max77686_i2c_probe,
|
|
};
|
|
|
|
module_i2c_driver(max77686_i2c_driver);
|
|
|
|
MODULE_DESCRIPTION("MAXIM 77686/802 multi-function core driver");
|
|
MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
|
|
MODULE_LICENSE("GPL");
|