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/*
* GPIO driver for TPS68470 PMIC
*
* Copyright (C) 2017 Intel Corporation
*
* Authors:
* Antti Laakso <antti.laakso@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/gpio/driver.h>
#include <linux/mfd/tps68470.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#define TPS68470_N_LOGIC_OUTPUT 3
#define TPS68470_N_REGULAR_GPIO 7
#define TPS68470_N_GPIO (TPS68470_N_LOGIC_OUTPUT + TPS68470_N_REGULAR_GPIO)
struct tps68470_gpio_data {
struct regmap *tps68470_regmap;
struct gpio_chip gc;
};
static int tps68470_gpio_get(struct gpio_chip *gc, unsigned int offset)
{
struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
struct regmap *regmap = tps68470_gpio->tps68470_regmap;
unsigned int reg = TPS68470_REG_GPDO;
int val, ret;
if (offset >= TPS68470_N_REGULAR_GPIO) {
offset -= TPS68470_N_REGULAR_GPIO;
reg = TPS68470_REG_SGPO;
}
ret = regmap_read(regmap, reg, &val);
if (ret) {
dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n",
TPS68470_REG_SGPO);
return ret;
}
return !!(val & BIT(offset));
}
/* Return 0 if output, 1 if input */
static int tps68470_gpio_get_direction(struct gpio_chip *gc,
unsigned int offset)
{
struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
struct regmap *regmap = tps68470_gpio->tps68470_regmap;
int val, ret;
/* rest are always outputs */
if (offset >= TPS68470_N_REGULAR_GPIO)
return 0;
ret = regmap_read(regmap, TPS68470_GPIO_CTL_REG_A(offset), &val);
if (ret) {
dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n",
TPS68470_GPIO_CTL_REG_A(offset));
return ret;
}
val &= TPS68470_GPIO_MODE_MASK;
return val >= TPS68470_GPIO_MODE_OUT_CMOS ? 0 : 1;
}
static void tps68470_gpio_set(struct gpio_chip *gc, unsigned int offset,
int value)
{
struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
struct regmap *regmap = tps68470_gpio->tps68470_regmap;
unsigned int reg = TPS68470_REG_GPDO;
if (offset >= TPS68470_N_REGULAR_GPIO) {
reg = TPS68470_REG_SGPO;
offset -= TPS68470_N_REGULAR_GPIO;
}
regmap_update_bits(regmap, reg, BIT(offset), value ? BIT(offset) : 0);
}
static int tps68470_gpio_output(struct gpio_chip *gc, unsigned int offset,
int value)
{
struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
struct regmap *regmap = tps68470_gpio->tps68470_regmap;
/* rest are always outputs */
if (offset >= TPS68470_N_REGULAR_GPIO)
return 0;
/* Set the initial value */
tps68470_gpio_set(gc, offset, value);
return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset),
TPS68470_GPIO_MODE_MASK,
TPS68470_GPIO_MODE_OUT_CMOS);
}
static int tps68470_gpio_input(struct gpio_chip *gc, unsigned int offset)
{
struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
struct regmap *regmap = tps68470_gpio->tps68470_regmap;
/* rest are always outputs */
if (offset >= TPS68470_N_REGULAR_GPIO)
return -EINVAL;
return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset),
TPS68470_GPIO_MODE_MASK, 0x00);
}
static const char *tps68470_names[TPS68470_N_GPIO] = {
"gpio.0", "gpio.1", "gpio.2", "gpio.3",
"gpio.4", "gpio.5", "gpio.6",
"s_enable", "s_idle", "s_resetn",
};
static int tps68470_gpio_probe(struct platform_device *pdev)
{
struct tps68470_gpio_data *tps68470_gpio;
int ret;
tps68470_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps68470_gpio),
GFP_KERNEL);
if (!tps68470_gpio)
return -ENOMEM;
tps68470_gpio->tps68470_regmap = dev_get_drvdata(pdev->dev.parent);
tps68470_gpio->gc.label = "tps68470-gpio";
tps68470_gpio->gc.owner = THIS_MODULE;
tps68470_gpio->gc.direction_input = tps68470_gpio_input;
tps68470_gpio->gc.direction_output = tps68470_gpio_output;
tps68470_gpio->gc.get = tps68470_gpio_get;
tps68470_gpio->gc.get_direction = tps68470_gpio_get_direction;
tps68470_gpio->gc.set = tps68470_gpio_set;
tps68470_gpio->gc.can_sleep = true;
tps68470_gpio->gc.names = tps68470_names;
tps68470_gpio->gc.ngpio = TPS68470_N_GPIO;
tps68470_gpio->gc.base = -1;
tps68470_gpio->gc.parent = &pdev->dev;
ret = devm_gpiochip_add_data(&pdev->dev, &tps68470_gpio->gc,
tps68470_gpio);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to register gpio_chip: %d\n", ret);
return ret;
}
platform_set_drvdata(pdev, tps68470_gpio);
return ret;
}
static struct platform_driver tps68470_gpio_driver = {
.driver = {
.name = "tps68470-gpio",
},
.probe = tps68470_gpio_probe,
};
builtin_platform_driver(tps68470_gpio_driver)
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