246 lines
6.5 KiB
C
246 lines
6.5 KiB
C
/*
|
|
* max14577.c - mfd core driver for the Maxim 14577
|
|
*
|
|
* Copyright (C) 2013 Samsung Electrnoics
|
|
* Chanwoo Choi <cw00.choi@samsung.com>
|
|
* Krzysztof Kozlowski <k.kozlowski@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.
|
|
*
|
|
* This driver is based on max8997.c
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/mfd/core.h>
|
|
#include <linux/mfd/max14577.h>
|
|
#include <linux/mfd/max14577-private.h>
|
|
|
|
static struct mfd_cell max14577_devs[] = {
|
|
{ .name = "max14577-muic", },
|
|
{
|
|
.name = "max14577-regulator",
|
|
.of_compatible = "maxim,max14577-regulator",
|
|
},
|
|
{ .name = "max14577-charger", },
|
|
};
|
|
|
|
static bool max14577_volatile_reg(struct device *dev, unsigned int reg)
|
|
{
|
|
switch (reg) {
|
|
case MAX14577_REG_INT1 ... MAX14577_REG_STATUS3:
|
|
return true;
|
|
default:
|
|
break;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static const struct regmap_config max14577_regmap_config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
.volatile_reg = max14577_volatile_reg,
|
|
.max_register = MAX14577_REG_END,
|
|
};
|
|
|
|
static const struct regmap_irq max14577_irqs[] = {
|
|
/* INT1 interrupts */
|
|
{ .reg_offset = 0, .mask = INT1_ADC_MASK, },
|
|
{ .reg_offset = 0, .mask = INT1_ADCLOW_MASK, },
|
|
{ .reg_offset = 0, .mask = INT1_ADCERR_MASK, },
|
|
/* INT2 interrupts */
|
|
{ .reg_offset = 1, .mask = INT2_CHGTYP_MASK, },
|
|
{ .reg_offset = 1, .mask = INT2_CHGDETRUN_MASK, },
|
|
{ .reg_offset = 1, .mask = INT2_DCDTMR_MASK, },
|
|
{ .reg_offset = 1, .mask = INT2_DBCHG_MASK, },
|
|
{ .reg_offset = 1, .mask = INT2_VBVOLT_MASK, },
|
|
/* INT3 interrupts */
|
|
{ .reg_offset = 2, .mask = INT3_EOC_MASK, },
|
|
{ .reg_offset = 2, .mask = INT3_CGMBC_MASK, },
|
|
{ .reg_offset = 2, .mask = INT3_OVP_MASK, },
|
|
{ .reg_offset = 2, .mask = INT3_MBCCHGERR_MASK, },
|
|
};
|
|
|
|
static const struct regmap_irq_chip max14577_irq_chip = {
|
|
.name = "max14577",
|
|
.status_base = MAX14577_REG_INT1,
|
|
.mask_base = MAX14577_REG_INTMASK1,
|
|
.mask_invert = 1,
|
|
.num_regs = 3,
|
|
.irqs = max14577_irqs,
|
|
.num_irqs = ARRAY_SIZE(max14577_irqs),
|
|
};
|
|
|
|
static int max14577_i2c_probe(struct i2c_client *i2c,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct max14577 *max14577;
|
|
struct max14577_platform_data *pdata = dev_get_platdata(&i2c->dev);
|
|
struct device_node *np = i2c->dev.of_node;
|
|
u8 reg_data;
|
|
int ret = 0;
|
|
|
|
if (np) {
|
|
pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL);
|
|
if (!pdata)
|
|
return -ENOMEM;
|
|
i2c->dev.platform_data = pdata;
|
|
}
|
|
|
|
if (!pdata) {
|
|
dev_err(&i2c->dev, "No platform data found.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
max14577 = devm_kzalloc(&i2c->dev, sizeof(*max14577), GFP_KERNEL);
|
|
if (!max14577)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(i2c, max14577);
|
|
max14577->dev = &i2c->dev;
|
|
max14577->i2c = i2c;
|
|
max14577->irq = i2c->irq;
|
|
|
|
max14577->regmap = devm_regmap_init_i2c(i2c, &max14577_regmap_config);
|
|
if (IS_ERR(max14577->regmap)) {
|
|
ret = PTR_ERR(max14577->regmap);
|
|
dev_err(max14577->dev, "Failed to allocate register map: %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = max14577_read_reg(max14577->regmap, MAX14577_REG_DEVICEID,
|
|
®_data);
|
|
if (ret) {
|
|
dev_err(max14577->dev, "Device not found on this channel: %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
max14577->vendor_id = ((reg_data & DEVID_VENDORID_MASK) >>
|
|
DEVID_VENDORID_SHIFT);
|
|
max14577->device_id = ((reg_data & DEVID_DEVICEID_MASK) >>
|
|
DEVID_DEVICEID_SHIFT);
|
|
dev_info(max14577->dev, "Device ID: 0x%x, vendor: 0x%x\n",
|
|
max14577->device_id, max14577->vendor_id);
|
|
|
|
ret = regmap_add_irq_chip(max14577->regmap, max14577->irq,
|
|
IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 0,
|
|
&max14577_irq_chip,
|
|
&max14577->irq_data);
|
|
if (ret != 0) {
|
|
dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n",
|
|
max14577->irq, ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = mfd_add_devices(max14577->dev, -1, max14577_devs,
|
|
ARRAY_SIZE(max14577_devs), NULL, 0,
|
|
regmap_irq_get_domain(max14577->irq_data));
|
|
if (ret < 0)
|
|
goto err_mfd;
|
|
|
|
device_init_wakeup(max14577->dev, 1);
|
|
|
|
return 0;
|
|
|
|
err_mfd:
|
|
regmap_del_irq_chip(max14577->irq, max14577->irq_data);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int max14577_i2c_remove(struct i2c_client *i2c)
|
|
{
|
|
struct max14577 *max14577 = i2c_get_clientdata(i2c);
|
|
|
|
mfd_remove_devices(max14577->dev);
|
|
regmap_del_irq_chip(max14577->irq, max14577->irq_data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id max14577_i2c_id[] = {
|
|
{ "max14577", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, max14577_i2c_id);
|
|
|
|
static int max14577_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
|
|
struct max14577 *max14577 = i2c_get_clientdata(i2c);
|
|
|
|
if (device_may_wakeup(dev)) {
|
|
enable_irq_wake(max14577->irq);
|
|
/*
|
|
* MUIC IRQ must be disabled during suspend if this is
|
|
* a wake up source because it will be handled before
|
|
* resuming I2C.
|
|
*
|
|
* When device is woken up from suspend (e.g. by ADC change),
|
|
* 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(max14577->irq);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int max14577_resume(struct device *dev)
|
|
{
|
|
struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
|
|
struct max14577 *max14577 = i2c_get_clientdata(i2c);
|
|
|
|
if (device_may_wakeup(dev)) {
|
|
disable_irq_wake(max14577->irq);
|
|
enable_irq(max14577->irq);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct of_device_id max14577_dt_match[] = {
|
|
{ .compatible = "maxim,max14577", },
|
|
{},
|
|
};
|
|
|
|
static SIMPLE_DEV_PM_OPS(max14577_pm, max14577_suspend, max14577_resume);
|
|
|
|
static struct i2c_driver max14577_i2c_driver = {
|
|
.driver = {
|
|
.name = "max14577",
|
|
.owner = THIS_MODULE,
|
|
.pm = &max14577_pm,
|
|
.of_match_table = max14577_dt_match,
|
|
},
|
|
.probe = max14577_i2c_probe,
|
|
.remove = max14577_i2c_remove,
|
|
.id_table = max14577_i2c_id,
|
|
};
|
|
|
|
static int __init max14577_i2c_init(void)
|
|
{
|
|
return i2c_add_driver(&max14577_i2c_driver);
|
|
}
|
|
subsys_initcall(max14577_i2c_init);
|
|
|
|
static void __exit max14577_i2c_exit(void)
|
|
{
|
|
i2c_del_driver(&max14577_i2c_driver);
|
|
}
|
|
module_exit(max14577_i2c_exit);
|
|
|
|
MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <k.kozlowski@samsung.com>");
|
|
MODULE_DESCRIPTION("MAXIM 14577 multi-function core driver");
|
|
MODULE_LICENSE("GPL");
|