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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/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>
#define I2C_ADDR_RTC (0x0C >> 1)
static const struct mfd_cell max77686_devs[] = {
{ .name = "max77686-pmic", },
{ .name = "max77686-rtc", },
{ .name = "max77686-clk", },
};
static struct regmap_config max77686_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
static struct regmap_config max77686_rtc_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
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 max77686_rtc_irqs[] = {
/* RTC interrupts */
{ .reg_offset = 0, .mask = MAX77686_RTCINT_RTC60S_MSK, },
{ .reg_offset = 0, .mask = MAX77686_RTCINT_RTCA1_MSK, },
{ .reg_offset = 0, .mask = MAX77686_RTCINT_RTCA2_MSK, },
{ .reg_offset = 0, .mask = MAX77686_RTCINT_SMPL_MSK, },
{ .reg_offset = 0, .mask = MAX77686_RTCINT_RTC1S_MSK, },
{ .reg_offset = 0, .mask = MAX77686_RTCINT_WTSR_MSK, },
};
static const struct regmap_irq_chip max77686_rtc_irq_chip = {
.name = "max77686-rtc",
.status_base = MAX77686_RTC_INT,
.mask_base = MAX77686_RTC_INTM,
.num_regs = 1,
.irqs = max77686_rtc_irqs,
.num_irqs = ARRAY_SIZE(max77686_rtc_irqs),
};
static const 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;
}
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 = dev_get_platdata(&i2c->dev);
unsigned int data;
int ret = 0;
if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node)
pdata = max77686_i2c_parse_dt_pdata(&i2c->dev);
if (!pdata) {
dev_err(&i2c->dev, "No platform data found.\n");
return -EIO;
}
max77686 = devm_kzalloc(&i2c->dev,
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 = 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);
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");
return -ENODEV;
}
max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC);
if (!max77686->rtc) {
dev_err(max77686->dev, "Failed to allocate I2C device for RTC\n");
return -ENODEV;
}
i2c_set_clientdata(max77686->rtc, max77686);
max77686->rtc_regmap = devm_regmap_init_i2c(max77686->rtc,
&max77686_rtc_regmap_config);
if (IS_ERR(max77686->rtc_regmap)) {
ret = PTR_ERR(max77686->rtc_regmap);
dev_err(max77686->dev, "failed to allocate RTC regmap: %d\n",
ret);
goto err_unregister_i2c;
}
ret = regmap_add_irq_chip(max77686->regmap, max77686->irq,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
IRQF_SHARED, 0, &max77686_irq_chip,
&max77686->irq_data);
if (ret != 0) {
dev_err(&i2c->dev, "failed to add PMIC irq chip: %d\n", ret);
goto err_unregister_i2c;
}
ret = regmap_add_irq_chip(max77686->rtc_regmap, max77686->irq,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
IRQF_SHARED, 0, &max77686_rtc_irq_chip,
&max77686->rtc_irq_data);
if (ret != 0) {
dev_err(&i2c->dev, "failed to add RTC irq chip: %d\n", ret);
goto err_del_irqc;
}
ret = mfd_add_devices(max77686->dev, -1, max77686_devs,
ARRAY_SIZE(max77686_devs), NULL, 0, NULL);
if (ret < 0) {
dev_err(&i2c->dev, "failed to add MFD devices: %d\n", ret);
goto err_del_rtc_irqc;
}
return 0;
err_del_rtc_irqc:
regmap_del_irq_chip(max77686->irq, max77686->rtc_irq_data);
err_del_irqc:
regmap_del_irq_chip(max77686->irq, max77686->irq_data);
err_unregister_i2c:
i2c_unregister_device(max77686->rtc);
return ret;
}
static int max77686_i2c_remove(struct i2c_client *i2c)
{
struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
mfd_remove_devices(max77686->dev);
regmap_del_irq_chip(max77686->irq, max77686->rtc_irq_data);
regmap_del_irq_chip(max77686->irq, max77686->irq_data);
i2c_unregister_device(max77686->rtc);
return 0;
}
static const struct i2c_device_id max77686_i2c_id[] = {
{ "max77686", TYPE_MAX77686 },
{ }
};
MODULE_DEVICE_TABLE(i2c, max77686_i2c_id);
#ifdef CONFIG_PM_SLEEP
static int max77686_suspend(struct device *dev)
{
struct i2c_client *i2c = container_of(dev, struct 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 = container_of(dev, struct 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",
.owner = THIS_MODULE,
.pm = &max77686_pm,
.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");
|
