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drivers/mfd/tps68470.c
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/*
* TPS68470 chip Parent driver
*
* Copyright (C) 2017 Intel Corporation
*
* Authors:
* Rajmohan Mani <rajmohan.mani@intel.com>
* Tianshu Qiu <tian.shu.qiu@intel.com>
* Jian Xu Zheng <jian.xu.zheng@intel.com>
* Yuning Pu <yuning.pu@intel.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 version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps68470.h>
#include <linux/regmap.h>
static const struct mfd_cell tps68470s[] = {
{ .name = "tps68470-gpio" },
{ .name = "tps68470_pmic_opregion" },
};
static const struct regmap_config tps68470_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = TPS68470_REG_MAX,
};
static int tps68470_chip_init(struct device *dev, struct regmap *regmap)
{
unsigned int version;
int ret;
/* Force software reset */
ret = regmap_write(regmap, TPS68470_REG_RESET, TPS68470_REG_RESET_MASK);
if (ret)
return ret;
ret = regmap_read(regmap, TPS68470_REG_REVID, &version);
if (ret) {
dev_err(dev, "Failed to read revision register: %d
", ret);
return ret;
}
dev_info(dev, "TPS68470 REVID: 0x%x
", version);
return 0;
}
static int tps68470_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct regmap *regmap;
int ret;
regmap = devm_regmap_init_i2c(client, &tps68470_regmap_config);
if (IS_ERR(regmap)) {
dev_err(dev, "devm_regmap_init_i2c Error %ld
",
PTR_ERR(regmap));
return PTR_ERR(regmap);
}
i2c_set_clientdata(client, regmap);
ret = tps68470_chip_init(dev, regmap);
if (ret < 0) {
dev_err(dev, "TPS68470 Init Error %d
", ret);
return ret;
}
ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, tps68470s,
ARRAY_SIZE(tps68470s), NULL, 0, NULL);
if (ret < 0) {
dev_err(dev, "devm_mfd_add_devices failed: %d
", ret);
return ret;
}
return 0;
}
static const struct acpi_device_id tps68470_acpi_ids[] = {
{"INT3472"},
{},
};
MODULE_DEVICE_TABLE(acpi, tps68470_acpi_ids);
static struct i2c_driver tps68470_driver = {
.driver = {
.name = "tps68470",
.acpi_match_table = tps68470_acpi_ids,
},
.probe_new = tps68470_probe,
};
builtin_i2c_driver(tps68470_driver);
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