mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 10:34:09 +08:00
e42615ec23
It's hard for occasional GPIO code reader/writer to know if values 0/1 equal to IN or OUT. Use defined GPIO_LINE_DIRECTION_IN and GPIO_LINE_DIRECTION_OUT to help them out. NOTE - for gpio-amd-fch and gpio-bd9571mwv: This commit also changes the return value for direction get to equal 1 for direction INPUT. Prior this commit these drivers might have returned some other positive value but 1 for INPUT. Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> Acked-by: Scott Branden <scott.branden@broadcom.com> Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com> Reviewed-by: Michal Simek <michal.simek@xilinx.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com> Acked-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
169 lines
4.6 KiB
C
169 lines
4.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* 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>
|
|
*/
|
|
|
|
#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));
|
|
}
|
|
|
|
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 GPIO_LINE_DIRECTION_OUT;
|
|
|
|
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 ? GPIO_LINE_DIRECTION_OUT :
|
|
GPIO_LINE_DIRECTION_IN;
|
|
}
|
|
|
|
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)
|