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alistair23-linux/drivers/mfd/tps65218.c
Javier Martinez Canillas 4895e493f9 mfd: Export OF module alias information in missing drivers 
The I2C core always reports the MODALIAS uevent as "i2c:<client name"
regardless if the driver was matched using the I2C id_table or the
of_match_table. So technically there's no need for a driver to export
the OF table since currently it's not used.

In fact, the I2C device ID table is mandatory for I2C drivers since
a i2c_device_id is passed to the driver's probe function even if the
I2C core used the OF table to match the driver.

And since the I2C core uses different tables, OF-only drivers needs to
have duplicated data that has to be kept in sync and also the dev node
compatible manufacturer prefix is stripped when reporting the MODALIAS.

To avoid the above, the I2C core behavior may be changed in the future
to not require an I2C device table for OF-only drivers and report the
OF module alias. So, it's better to also export the OF table to prevent
breaking module autoloading if that happens.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2015-08-11 15:09:10 +01:00

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/*
* 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 const struct regmap_range tps65218_yes_ranges[] = {
regmap_reg_range(TPS65218_REG_INT1, TPS65218_REG_INT2),
regmap_reg_range(TPS65218_REG_STATUS, TPS65218_REG_STATUS),
};
static const struct regmap_access_table tps65218_volatile_table = {
.yes_ranges = tps65218_yes_ranges,
.n_yes_ranges = ARRAY_SIZE(tps65218_yes_ranges),
};
static const struct regmap_config tps65218_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.cache_type = REGCACHE_RBTREE,
.volatile_table = &tps65218_volatile_table,
};
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,
.status_base = TPS65218_REG_INT1,
};
static const struct of_device_id of_tps65218_match_table[] = {
{ .compatible = "ti,tps65218", },
{}
};
MODULE_DEVICE_TABLE(of, of_tps65218_match_table);
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",
.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");
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