forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
230 lines
6.2 KiB
230 lines
6.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
// Copyright (C) 2018 ROHM Semiconductors |
|
// gpio-bd70528.c ROHM BD70528MWV gpio driver |
|
|
|
#include <linux/gpio/driver.h> |
|
#include <linux/mfd/rohm-bd70528.h> |
|
#include <linux/module.h> |
|
#include <linux/platform_device.h> |
|
#include <linux/regmap.h> |
|
|
|
#define GPIO_IN_REG(offset) (BD70528_REG_GPIO1_IN + (offset) * 2) |
|
#define GPIO_OUT_REG(offset) (BD70528_REG_GPIO1_OUT + (offset) * 2) |
|
|
|
struct bd70528_gpio { |
|
struct regmap *regmap; |
|
struct device *dev; |
|
struct gpio_chip gpio; |
|
}; |
|
|
|
static int bd70528_set_debounce(struct bd70528_gpio *bdgpio, |
|
unsigned int offset, unsigned int debounce) |
|
{ |
|
u8 val; |
|
|
|
switch (debounce) { |
|
case 0: |
|
val = BD70528_DEBOUNCE_DISABLE; |
|
break; |
|
case 1 ... 15000: |
|
val = BD70528_DEBOUNCE_15MS; |
|
break; |
|
case 15001 ... 30000: |
|
val = BD70528_DEBOUNCE_30MS; |
|
break; |
|
case 30001 ... 50000: |
|
val = BD70528_DEBOUNCE_50MS; |
|
break; |
|
default: |
|
dev_err(bdgpio->dev, |
|
"Invalid debounce value %u\n", debounce); |
|
return -EINVAL; |
|
} |
|
return regmap_update_bits(bdgpio->regmap, GPIO_IN_REG(offset), |
|
BD70528_DEBOUNCE_MASK, val); |
|
} |
|
|
|
static int bd70528_get_direction(struct gpio_chip *chip, unsigned int offset) |
|
{ |
|
struct bd70528_gpio *bdgpio = gpiochip_get_data(chip); |
|
int val, ret; |
|
|
|
/* Do we need to do something to IRQs here? */ |
|
ret = regmap_read(bdgpio->regmap, GPIO_OUT_REG(offset), &val); |
|
if (ret) { |
|
dev_err(bdgpio->dev, "Could not read gpio direction\n"); |
|
return ret; |
|
} |
|
if (val & BD70528_GPIO_OUT_EN_MASK) |
|
return GPIO_LINE_DIRECTION_OUT; |
|
|
|
return GPIO_LINE_DIRECTION_IN; |
|
} |
|
|
|
static int bd70528_gpio_set_config(struct gpio_chip *chip, unsigned int offset, |
|
unsigned long config) |
|
{ |
|
struct bd70528_gpio *bdgpio = gpiochip_get_data(chip); |
|
|
|
switch (pinconf_to_config_param(config)) { |
|
case PIN_CONFIG_DRIVE_OPEN_DRAIN: |
|
return regmap_update_bits(bdgpio->regmap, |
|
GPIO_OUT_REG(offset), |
|
BD70528_GPIO_DRIVE_MASK, |
|
BD70528_GPIO_OPEN_DRAIN); |
|
break; |
|
case PIN_CONFIG_DRIVE_PUSH_PULL: |
|
return regmap_update_bits(bdgpio->regmap, |
|
GPIO_OUT_REG(offset), |
|
BD70528_GPIO_DRIVE_MASK, |
|
BD70528_GPIO_PUSH_PULL); |
|
break; |
|
case PIN_CONFIG_INPUT_DEBOUNCE: |
|
return bd70528_set_debounce(bdgpio, offset, |
|
pinconf_to_config_argument(config)); |
|
break; |
|
default: |
|
break; |
|
} |
|
return -ENOTSUPP; |
|
} |
|
|
|
static int bd70528_direction_input(struct gpio_chip *chip, unsigned int offset) |
|
{ |
|
struct bd70528_gpio *bdgpio = gpiochip_get_data(chip); |
|
|
|
/* Do we need to do something to IRQs here? */ |
|
return regmap_update_bits(bdgpio->regmap, GPIO_OUT_REG(offset), |
|
BD70528_GPIO_OUT_EN_MASK, |
|
BD70528_GPIO_OUT_DISABLE); |
|
} |
|
|
|
static void bd70528_gpio_set(struct gpio_chip *chip, unsigned int offset, |
|
int value) |
|
{ |
|
int ret; |
|
struct bd70528_gpio *bdgpio = gpiochip_get_data(chip); |
|
u8 val = (value) ? BD70528_GPIO_OUT_HI : BD70528_GPIO_OUT_LO; |
|
|
|
ret = regmap_update_bits(bdgpio->regmap, GPIO_OUT_REG(offset), |
|
BD70528_GPIO_OUT_MASK, val); |
|
if (ret) |
|
dev_err(bdgpio->dev, "Could not set gpio to %d\n", value); |
|
} |
|
|
|
static int bd70528_direction_output(struct gpio_chip *chip, unsigned int offset, |
|
int value) |
|
{ |
|
struct bd70528_gpio *bdgpio = gpiochip_get_data(chip); |
|
|
|
bd70528_gpio_set(chip, offset, value); |
|
return regmap_update_bits(bdgpio->regmap, GPIO_OUT_REG(offset), |
|
BD70528_GPIO_OUT_EN_MASK, |
|
BD70528_GPIO_OUT_ENABLE); |
|
} |
|
|
|
#define GPIO_IN_STATE_MASK(offset) (BD70528_GPIO_IN_STATE_BASE << (offset)) |
|
|
|
static int bd70528_gpio_get_o(struct bd70528_gpio *bdgpio, unsigned int offset) |
|
{ |
|
int ret; |
|
unsigned int val; |
|
|
|
ret = regmap_read(bdgpio->regmap, GPIO_OUT_REG(offset), &val); |
|
if (!ret) |
|
ret = !!(val & BD70528_GPIO_OUT_MASK); |
|
else |
|
dev_err(bdgpio->dev, "GPIO (out) state read failed\n"); |
|
|
|
return ret; |
|
} |
|
|
|
static int bd70528_gpio_get_i(struct bd70528_gpio *bdgpio, unsigned int offset) |
|
{ |
|
unsigned int val; |
|
int ret; |
|
|
|
ret = regmap_read(bdgpio->regmap, BD70528_REG_GPIO_STATE, &val); |
|
|
|
if (!ret) |
|
ret = !(val & GPIO_IN_STATE_MASK(offset)); |
|
else |
|
dev_err(bdgpio->dev, "GPIO (in) state read failed\n"); |
|
|
|
return ret; |
|
} |
|
|
|
static int bd70528_gpio_get(struct gpio_chip *chip, unsigned int offset) |
|
{ |
|
int ret; |
|
struct bd70528_gpio *bdgpio = gpiochip_get_data(chip); |
|
|
|
/* |
|
* There is a race condition where someone might be changing the |
|
* GPIO direction after we get it but before we read the value. But |
|
* application design where GPIO direction may be changed just when |
|
* we read GPIO value would be pointless as reader could not know |
|
* whether the returned high/low state is caused by input or output. |
|
* Or then there must be other ways to mitigate the issue. Thus |
|
* locking would make no sense. |
|
*/ |
|
ret = bd70528_get_direction(chip, offset); |
|
if (ret == GPIO_LINE_DIRECTION_OUT) |
|
ret = bd70528_gpio_get_o(bdgpio, offset); |
|
else if (ret == GPIO_LINE_DIRECTION_IN) |
|
ret = bd70528_gpio_get_i(bdgpio, offset); |
|
else |
|
dev_err(bdgpio->dev, "failed to read GPIO direction\n"); |
|
|
|
return ret; |
|
} |
|
|
|
static int bd70528_probe(struct platform_device *pdev) |
|
{ |
|
struct device *dev = &pdev->dev; |
|
struct bd70528_gpio *bdgpio; |
|
int ret; |
|
|
|
bdgpio = devm_kzalloc(dev, sizeof(*bdgpio), GFP_KERNEL); |
|
if (!bdgpio) |
|
return -ENOMEM; |
|
bdgpio->dev = dev; |
|
bdgpio->gpio.parent = dev->parent; |
|
bdgpio->gpio.label = "bd70528-gpio"; |
|
bdgpio->gpio.owner = THIS_MODULE; |
|
bdgpio->gpio.get_direction = bd70528_get_direction; |
|
bdgpio->gpio.direction_input = bd70528_direction_input; |
|
bdgpio->gpio.direction_output = bd70528_direction_output; |
|
bdgpio->gpio.set_config = bd70528_gpio_set_config; |
|
bdgpio->gpio.can_sleep = true; |
|
bdgpio->gpio.get = bd70528_gpio_get; |
|
bdgpio->gpio.set = bd70528_gpio_set; |
|
bdgpio->gpio.ngpio = 4; |
|
bdgpio->gpio.base = -1; |
|
#ifdef CONFIG_OF_GPIO |
|
bdgpio->gpio.of_node = dev->parent->of_node; |
|
#endif |
|
bdgpio->regmap = dev_get_regmap(dev->parent, NULL); |
|
if (!bdgpio->regmap) |
|
return -ENODEV; |
|
|
|
ret = devm_gpiochip_add_data(dev, &bdgpio->gpio, bdgpio); |
|
if (ret) |
|
dev_err(dev, "gpio_init: Failed to add bd70528-gpio\n"); |
|
|
|
return ret; |
|
} |
|
|
|
static struct platform_driver bd70528_gpio = { |
|
.driver = { |
|
.name = "bd70528-gpio" |
|
}, |
|
.probe = bd70528_probe, |
|
}; |
|
|
|
module_platform_driver(bd70528_gpio); |
|
|
|
MODULE_AUTHOR("Matti Vaittinen <[email protected]>"); |
|
MODULE_DESCRIPTION("BD70528 voltage regulator driver"); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_ALIAS("platform:bd70528-gpio");
|
|
|