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/*
* Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
* Keerthy <j-keerthy@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.
*
* Based on the LP873X driver
*/
#include <linux/gpio/driver.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/mfd/lp87565.h>
struct lp87565_gpio {
struct gpio_chip chip;
struct regmap *map;
};
static int lp87565_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
struct lp87565_gpio *gpio = gpiochip_get_data(chip);
int ret, val;
ret = regmap_read(gpio->map, LP87565_REG_GPIO_IN, &val);
if (ret < 0)
return ret;
return !!(val & BIT(offset));
}
static void lp87565_gpio_set(struct gpio_chip *chip, unsigned int offset,
int value)
{
struct lp87565_gpio *gpio = gpiochip_get_data(chip);
regmap_update_bits(gpio->map, LP87565_REG_GPIO_OUT,
BIT(offset), value ? BIT(offset) : 0);
}
static int lp87565_gpio_get_direction(struct gpio_chip *chip,
unsigned int offset)
{
struct lp87565_gpio *gpio = gpiochip_get_data(chip);
int ret, val;
ret = regmap_read(gpio->map, LP87565_REG_GPIO_CONFIG, &val);
if (ret < 0)
return ret;
if (val & BIT(offset))
return GPIO_LINE_DIRECTION_OUT;
return GPIO_LINE_DIRECTION_IN;
}
static int lp87565_gpio_direction_input(struct gpio_chip *chip,
unsigned int offset)
{
struct lp87565_gpio *gpio = gpiochip_get_data(chip);
return regmap_update_bits(gpio->map,
LP87565_REG_GPIO_CONFIG,
BIT(offset), 0);
}
static int lp87565_gpio_direction_output(struct gpio_chip *chip,
unsigned int offset, int value)
{
struct lp87565_gpio *gpio = gpiochip_get_data(chip);
lp87565_gpio_set(chip, offset, value);
return regmap_update_bits(gpio->map,
LP87565_REG_GPIO_CONFIG,
BIT(offset), BIT(offset));
}
static int lp87565_gpio_request(struct gpio_chip *gc, unsigned int offset)
{
struct lp87565_gpio *gpio = gpiochip_get_data(gc);
int ret;
switch (offset) {
case 0:
case 1:
case 2:
/*
* MUX can program the pin to be in EN1/2/3 pin mode
* Or GPIO1/2/3 mode.
* Setup the GPIO*_SEL MUX to GPIO mode
*/
ret = regmap_update_bits(gpio->map,
LP87565_REG_PIN_FUNCTION,
BIT(offset), BIT(offset));
if (ret)
return ret;
break;
default:
return -EINVAL;
}
return 0;
}
static int lp87565_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
unsigned long config)
{
struct lp87565_gpio *gpio = gpiochip_get_data(gc);
switch (pinconf_to_config_param(config)) {
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
return regmap_update_bits(gpio->map,
LP87565_REG_GPIO_CONFIG,
BIT(offset +
__ffs(LP87565_GPIO1_OD)),
BIT(offset +
__ffs(LP87565_GPIO1_OD)));
case PIN_CONFIG_DRIVE_PUSH_PULL:
return regmap_update_bits(gpio->map,
LP87565_REG_GPIO_CONFIG,
BIT(offset +
__ffs(LP87565_GPIO1_OD)), 0);
default:
return -ENOTSUPP;
}
}
static const struct gpio_chip template_chip = {
.label = "lp87565-gpio",
.owner = THIS_MODULE,
.request = lp87565_gpio_request,
.get_direction = lp87565_gpio_get_direction,
.direction_input = lp87565_gpio_direction_input,
.direction_output = lp87565_gpio_direction_output,
.get = lp87565_gpio_get,
.set = lp87565_gpio_set,
.set_config = lp87565_gpio_set_config,
.base = -1,
.ngpio = 3,
.can_sleep = true,
};
static int lp87565_gpio_probe(struct platform_device *pdev)
{
struct lp87565_gpio *gpio;
struct lp87565 *lp87565;
int ret;
gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
if (!gpio)
return -ENOMEM;
lp87565 = dev_get_drvdata(pdev->dev.parent);
gpio->chip = template_chip;
gpio->chip.parent = lp87565->dev;
gpio->map = lp87565->regmap;
ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
if (ret < 0) {
dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
return ret;
}
return 0;
}
static const struct platform_device_id lp87565_gpio_id_table[] = {
{ "lp87565-q1-gpio", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table);
static struct platform_driver lp87565_gpio_driver = {
.driver = {
.name = "lp87565-gpio",
},
.probe = lp87565_gpio_probe,
.id_table = lp87565_gpio_id_table,
};
module_platform_driver(lp87565_gpio_driver);
MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
MODULE_DESCRIPTION("LP87565 GPIO driver");
MODULE_LICENSE("GPL v2");
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