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/*
* AS3711 PMIC MFC driver
*
* Copyright (C) 2012 Renesas Electronics Corporation
* Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the version 2 of the GNU General Public License as
* published by the Free Software Foundation
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mfd/as3711.h>
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/slab.h>
enum {
AS3711_REGULATOR,
AS3711_BACKLIGHT,
};
/*
* Ok to have it static: it is only used during probing and multiple I2C devices
* cannot be probed simultaneously. Just make sure to avoid stale data.
*/
static struct mfd_cell as3711_subdevs[] = {
[AS3711_REGULATOR] = {.name = "as3711-regulator",},
[AS3711_BACKLIGHT] = {.name = "as3711-backlight",},
};
static bool as3711_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case AS3711_GPIO_SIGNAL_IN:
case AS3711_INTERRUPT_STATUS_1:
case AS3711_INTERRUPT_STATUS_2:
case AS3711_INTERRUPT_STATUS_3:
case AS3711_CHARGER_STATUS_1:
case AS3711_CHARGER_STATUS_2:
case AS3711_REG_STATUS:
return true;
}
return false;
}
static bool as3711_precious_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case AS3711_INTERRUPT_STATUS_1:
case AS3711_INTERRUPT_STATUS_2:
case AS3711_INTERRUPT_STATUS_3:
return true;
}
return false;
}
static bool as3711_readable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case AS3711_SD_1_VOLTAGE:
case AS3711_SD_2_VOLTAGE:
case AS3711_SD_3_VOLTAGE:
case AS3711_SD_4_VOLTAGE:
case AS3711_LDO_1_VOLTAGE:
case AS3711_LDO_2_VOLTAGE:
case AS3711_LDO_3_VOLTAGE:
case AS3711_LDO_4_VOLTAGE:
case AS3711_LDO_5_VOLTAGE:
case AS3711_LDO_6_VOLTAGE:
case AS3711_LDO_7_VOLTAGE:
case AS3711_LDO_8_VOLTAGE:
case AS3711_SD_CONTROL:
case AS3711_GPIO_SIGNAL_OUT:
case AS3711_GPIO_SIGNAL_IN:
case AS3711_SD_CONTROL_1:
case AS3711_SD_CONTROL_2:
case AS3711_CURR_CONTROL:
case AS3711_CURR1_VALUE:
case AS3711_CURR2_VALUE:
case AS3711_CURR3_VALUE:
case AS3711_STEPUP_CONTROL_1:
case AS3711_STEPUP_CONTROL_2:
case AS3711_STEPUP_CONTROL_4:
case AS3711_STEPUP_CONTROL_5:
case AS3711_REG_STATUS:
case AS3711_INTERRUPT_STATUS_1:
case AS3711_INTERRUPT_STATUS_2:
case AS3711_INTERRUPT_STATUS_3:
case AS3711_CHARGER_STATUS_1:
case AS3711_CHARGER_STATUS_2:
case AS3711_ASIC_ID_1:
case AS3711_ASIC_ID_2:
return true;
}
return false;
}
static const struct regmap_config as3711_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.volatile_reg = as3711_volatile_reg,
.readable_reg = as3711_readable_reg,
.precious_reg = as3711_precious_reg,
.max_register = AS3711_MAX_REGS,
.num_reg_defaults_raw = AS3711_MAX_REGS,
.cache_type = REGCACHE_RBTREE,
};
static int as3711_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct as3711 *as3711;
struct as3711_platform_data *pdata = client->dev.platform_data;
unsigned int id1, id2;
int ret;
if (!pdata)
dev_dbg(&client->dev, "Platform data not found\n");
as3711 = devm_kzalloc(&client->dev, sizeof(struct as3711), GFP_KERNEL);
if (!as3711) {
dev_err(&client->dev, "Memory allocation failed\n");
return -ENOMEM;
}
as3711->dev = &client->dev;
i2c_set_clientdata(client, as3711);
if (client->irq)
dev_notice(&client->dev, "IRQ not supported yet\n");
as3711->regmap = devm_regmap_init_i2c(client, &as3711_regmap_config);
if (IS_ERR(as3711->regmap)) {
ret = PTR_ERR(as3711->regmap);
dev_err(&client->dev, "regmap initialization failed: %d\n", ret);
return ret;
}
ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_1, &id1);
if (!ret)
ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_2, &id2);
if (ret < 0) {
dev_err(&client->dev, "regmap_read() failed: %d\n", ret);
return ret;
}
if (id1 != 0x8b)
return -ENODEV;
dev_info(as3711->dev, "AS3711 detected: %x:%x\n", id1, id2);
/* We can reuse as3711_subdevs[], it will be copied in mfd_add_devices() */
if (pdata) {
as3711_subdevs[AS3711_REGULATOR].platform_data = &pdata->regulator;
as3711_subdevs[AS3711_REGULATOR].pdata_size = sizeof(pdata->regulator);
as3711_subdevs[AS3711_BACKLIGHT].platform_data = &pdata->backlight;
as3711_subdevs[AS3711_BACKLIGHT].pdata_size = sizeof(pdata->backlight);
} else {
as3711_subdevs[AS3711_REGULATOR].platform_data = NULL;
as3711_subdevs[AS3711_REGULATOR].pdata_size = 0;
as3711_subdevs[AS3711_BACKLIGHT].platform_data = NULL;
as3711_subdevs[AS3711_BACKLIGHT].pdata_size = 0;
}
ret = mfd_add_devices(as3711->dev, -1, as3711_subdevs,
ARRAY_SIZE(as3711_subdevs), NULL, 0, NULL);
if (ret < 0)
dev_err(&client->dev, "add mfd devices failed: %d\n", ret);
return ret;
}
static int as3711_i2c_remove(struct i2c_client *client)
{
struct as3711 *as3711 = i2c_get_clientdata(client);
mfd_remove_devices(as3711->dev);
return 0;
}
static const struct i2c_device_id as3711_i2c_id[] = {
{.name = "as3711", .driver_data = 0},
{}
};
MODULE_DEVICE_TABLE(i2c, as3711_i2c_id);
static struct i2c_driver as3711_i2c_driver = {
.driver = {
.name = "as3711",
.owner = THIS_MODULE,
},
.probe = as3711_i2c_probe,
.remove = as3711_i2c_remove,
.id_table = as3711_i2c_id,
};
static int __init as3711_i2c_init(void)
{
return i2c_add_driver(&as3711_i2c_driver);
}
/* Initialise early */
subsys_initcall(as3711_i2c_init);
static void __exit as3711_i2c_exit(void)
{
i2c_del_driver(&as3711_i2c_driver);
}
module_exit(as3711_i2c_exit);
MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
MODULE_DESCRIPTION("AS3711 PMIC driver");
MODULE_LICENSE("GPL v2");
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