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remarkable-linux/drivers/mfd/max77686.c
Laxman Dewangan f3937549a9 rtc: max77686: move initialisation of rtc regmap, irq chip locally 
To make RTC block of MAX77686/MAX77802 as independent driver,
move the registration of i2c device, regmap for register access
and irq_chip for interrupt support inside the RTC driver.
Removed the same initialisation from MFD driver.

Having this change will allow to reuse this driver for different
PMIC/devices from Maxim Semiconductor if they kept same RTC IP on
different PMIC. Some of examples as PMIC MAX77620, MAX20024 where
same RTC IP used and hence driver for these chips will use this
driver only for RTC support.

Suggested-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Tested-by: Javier Martinez Canillas <javier@osg.samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Tested-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-03-14 17:08:13 +01:00

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/*
* max77686.c - mfd core driver for the Maxim 77686/802
*
* 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>
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,
},
{ },
};
static int max77686_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct max77686_dev *max77686 = NULL;
const struct of_device_id *match;
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;
if (i2c->dev.of_node) {
match = of_match_node(max77686_pmic_dt_match, i2c->dev.of_node);
if (!match)
return -EINVAL;
max77686->type = (unsigned long)match->data;
} else
max77686->type = id->driver_data;
i2c_set_clientdata(i2c, max77686);
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 = regmap_add_irq_chip(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 = 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);
goto err_del_irqc;
}
return 0;
err_del_irqc:
regmap_del_irq_chip(max77686->irq, max77686->irq_data);
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->irq_data);
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 = 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 = 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 77686/802 multi-function core driver");
MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
MODULE_LICENSE("GPL");
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