/*
* Driver for TPS65218 Integrated power management chipsets
*
* Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether expressed or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License version 2 for more details.
*/
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/regmap.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/mutex.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps65218.h>
#define TPS65218_PASSWORD_REGS_UNLOCK 0x7D
/**
* tps65218_reg_read: Read a single tps65218 register.
*
* @tps: Device to read from.
* @reg: Register to read.
* @val: Contians the value
*/
int tps65218_reg_read(struct tps65218 *tps, unsigned int reg,
unsigned int *val)
{
return regmap_read(tps->regmap, reg, val);
}
EXPORT_SYMBOL_GPL(tps65218_reg_read);
/**
* tps65218_reg_write: Write a single tps65218 register.
*
* @tps65218: Device to write to.
* @reg: Register to write to.
* @val: Value to write.
* @level: Password protected level
*/
int tps65218_reg_write(struct tps65218 *tps, unsigned int reg,
unsigned int val, unsigned int level)
{
int ret;
unsigned int xor_reg_val;
switch (level) {
case TPS65218_PROTECT_NONE:
return regmap_write(tps->regmap, reg, val);
case TPS65218_PROTECT_L1:
xor_reg_val = reg ^ TPS65218_PASSWORD_REGS_UNLOCK;
ret = regmap_write(tps->regmap, TPS65218_REG_PASSWORD,
xor_reg_val);
if (ret < 0)
return ret;
return regmap_write(tps->regmap, reg, val);
default:
return -EINVAL;
}
}
EXPORT_SYMBOL_GPL(tps65218_reg_write);
/**
* tps65218_update_bits: Modify bits w.r.t mask, val and level.
*
* @tps65218: Device to write to.
* @reg: Register to read-write to.
* @mask: Mask.
* @val: Value to write.
* @level: Password protected level
*/
static int tps65218_update_bits(struct tps65218 *tps, unsigned int reg,
unsigned int mask, unsigned int val, unsigned int level)
{
int ret;
unsigned int data;
ret = tps65218_reg_read(tps, reg, &data);
if (ret) {
dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
return ret;
}
data &= ~mask;
data |= val & mask;
mutex_lock(&tps->tps_lock);
ret = tps65218_reg_write(tps, reg, data, level);
if (ret)
dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
mutex_unlock(&tps->tps_lock);
return ret;
}
int tps65218_set_bits(struct tps65218 *tps, unsigned int reg,
unsigned int mask, unsigned int val, unsigned int level)
{
return tps65218_update_bits(tps, reg, mask, val, level);
}
EXPORT_SYMBOL_GPL(tps65218_set_bits);
int tps65218_clear_bits(struct tps65218 *tps, unsigned int reg,
unsigned int mask, unsigned int level)
{
return tps65218_update_bits(tps, reg, mask, 0, level);
}
EXPORT_SYMBOL_GPL(tps65218_clear_bits);
static struct regmap_config tps65218_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.cache_type = REGCACHE_RBTREE,
};
static const struct regmap_irq tps65218_irqs[] = {
/* INT1 IRQs */
[TPS65218_PRGC_IRQ] = {
.mask = TPS65218_INT1_PRGC,
},
[TPS65218_CC_AQC_IRQ] = {
.mask = TPS65218_INT1_CC_AQC,
},
[TPS65218_HOT_IRQ] = {
.mask = TPS65218_INT1_HOT,
},
[TPS65218_PB_IRQ] = {
.mask = TPS65218_INT1_PB,
},
[TPS65218_AC_IRQ] = {
.mask = TPS65218_INT1_AC,
},
[TPS65218_VPRG_IRQ] = {
.mask = TPS65218_INT1_VPRG,
},
[TPS65218_INVALID1_IRQ] = {
},
[TPS65218_INVALID2_IRQ] = {
},
/* INT2 IRQs*/
[TPS65218_LS1_I_IRQ] = {
.mask = TPS65218_INT2_LS1_I,
.reg_offset = 1,
},
[TPS65218_LS2_I_IRQ] = {
.mask = TPS65218_INT2_LS2_I,
.reg_offset = 1,
},
[TPS65218_LS3_I_IRQ] = {
.mask = TPS65218_INT2_LS3_I,
.reg_offset = 1,
},
[TPS65218_LS1_F_IRQ] = {
.mask = TPS65218_INT2_LS1_F,
.reg_offset = 1,
},
[TPS65218_LS2_F_IRQ] = {
.mask = TPS65218_INT2_LS2_F,
.reg_offset = 1,
},
[TPS65218_LS3_F_IRQ] = {
.mask = TPS65218_INT2_LS3_F,
.reg_offset = 1,
},
[TPS65218_INVALID3_IRQ] = {
},
[TPS65218_INVALID4_IRQ] = {
},
};
static struct regmap_irq_chip tps65218_irq_chip = {
.name = "tps65218",
.irqs = tps65218_irqs,
.num_irqs = ARRAY_SIZE(tps65218_irqs),
.num_regs = 2,
.mask_base = TPS65218_REG_INT_MASK1,
};
static const struct of_device_id of_tps65218_match_table[] = {
{ .compatible = "ti,tps65218", },
{}
};
static int tps65218_probe(struct i2c_client *client,
const struct i2c_device_id *ids)
{
struct tps65218 *tps;
const struct of_device_id *match;
int ret;
match = of_match_device(of_tps65218_match_table, &client->dev);
if (!match) {
dev_err(&client->dev,
"Failed to find matching dt id\n");
return -EINVAL;
}
tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
if (!tps)
return -ENOMEM;
i2c_set_clientdata(client, tps);
tps->dev = &client->dev;
tps->irq = client->irq;
tps->regmap = devm_regmap_init_i2c(client, &tps65218_regmap_config);
if (IS_ERR(tps->regmap)) {
ret = PTR_ERR(tps->regmap);
dev_err(tps->dev, "Failed to allocate register map: %d\n",
ret);
return ret;
}
mutex_init(&tps->tps_lock);
ret = regmap_add_irq_chip(tps->regmap, tps->irq,
IRQF_ONESHOT, 0, &tps65218_irq_chip,
&tps->irq_data);
if (ret < 0)
return ret;
ret = of_platform_populate(client->dev.of_node, NULL, NULL,
&client->dev);
if (ret < 0)
goto err_irq;
return 0;
err_irq:
regmap_del_irq_chip(tps->irq, tps->irq_data);
return ret;
}
static int tps65218_remove(struct i2c_client *client)
{
struct tps65218 *tps = i2c_get_clientdata(client);
regmap_del_irq_chip(tps->irq, tps->irq_data);
return 0;
}
static const struct i2c_device_id tps65218_id_table[] = {
{ "tps65218", TPS65218 },
{ },
};
MODULE_DEVICE_TABLE(i2c, tps65218_id_table);
static struct i2c_driver tps65218_driver = {
.driver = {
.name = "tps65218",
.owner = THIS_MODULE,
.of_match_table = of_tps65218_match_table,
},
.probe = tps65218_probe,
.remove = tps65218_remove,
.id_table = tps65218_id_table,
};
module_i2c_driver(tps65218_driver);
MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
MODULE_DESCRIPTION("TPS65218 chip family multi-function driver");
MODULE_LICENSE("GPL v2");
