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.
139 lines
3.4 KiB
139 lines
3.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* ROHM BD9571MWV-M and BD9574MWF-M GPIO driver |
|
* |
|
* Copyright (C) 2017 Marek Vasut <[email protected]> |
|
* |
|
* Based on the TPS65086 driver |
|
* |
|
* NOTE: Interrupts are not supported yet. |
|
*/ |
|
|
|
#include <linux/gpio/driver.h> |
|
#include <linux/mfd/rohm-generic.h> |
|
#include <linux/module.h> |
|
#include <linux/platform_device.h> |
|
|
|
#include <linux/mfd/bd9571mwv.h> |
|
|
|
struct bd9571mwv_gpio { |
|
struct regmap *regmap; |
|
struct gpio_chip chip; |
|
}; |
|
|
|
static int bd9571mwv_gpio_get_direction(struct gpio_chip *chip, |
|
unsigned int offset) |
|
{ |
|
struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip); |
|
int ret, val; |
|
|
|
ret = regmap_read(gpio->regmap, BD9571MWV_GPIO_DIR, &val); |
|
if (ret < 0) |
|
return ret; |
|
if (val & BIT(offset)) |
|
return GPIO_LINE_DIRECTION_IN; |
|
|
|
return GPIO_LINE_DIRECTION_OUT; |
|
} |
|
|
|
static int bd9571mwv_gpio_direction_input(struct gpio_chip *chip, |
|
unsigned int offset) |
|
{ |
|
struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip); |
|
|
|
regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_DIR, BIT(offset), 0); |
|
|
|
return 0; |
|
} |
|
|
|
static int bd9571mwv_gpio_direction_output(struct gpio_chip *chip, |
|
unsigned int offset, int value) |
|
{ |
|
struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip); |
|
|
|
/* Set the initial value */ |
|
regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_OUT, |
|
BIT(offset), value ? BIT(offset) : 0); |
|
regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_DIR, |
|
BIT(offset), BIT(offset)); |
|
|
|
return 0; |
|
} |
|
|
|
static int bd9571mwv_gpio_get(struct gpio_chip *chip, unsigned int offset) |
|
{ |
|
struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip); |
|
int ret, val; |
|
|
|
ret = regmap_read(gpio->regmap, BD9571MWV_GPIO_IN, &val); |
|
if (ret < 0) |
|
return ret; |
|
|
|
return val & BIT(offset); |
|
} |
|
|
|
static void bd9571mwv_gpio_set(struct gpio_chip *chip, unsigned int offset, |
|
int value) |
|
{ |
|
struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip); |
|
|
|
regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_OUT, |
|
BIT(offset), value ? BIT(offset) : 0); |
|
} |
|
|
|
static const struct gpio_chip template_chip = { |
|
.label = "bd9571mwv-gpio", |
|
.owner = THIS_MODULE, |
|
.get_direction = bd9571mwv_gpio_get_direction, |
|
.direction_input = bd9571mwv_gpio_direction_input, |
|
.direction_output = bd9571mwv_gpio_direction_output, |
|
.get = bd9571mwv_gpio_get, |
|
.set = bd9571mwv_gpio_set, |
|
.base = -1, |
|
.ngpio = 2, |
|
.can_sleep = true, |
|
}; |
|
|
|
static int bd9571mwv_gpio_probe(struct platform_device *pdev) |
|
{ |
|
struct bd9571mwv_gpio *gpio; |
|
int ret; |
|
|
|
gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); |
|
if (!gpio) |
|
return -ENOMEM; |
|
|
|
platform_set_drvdata(pdev, gpio); |
|
|
|
gpio->regmap = dev_get_regmap(pdev->dev.parent, NULL); |
|
gpio->chip = template_chip; |
|
gpio->chip.parent = pdev->dev.parent; |
|
|
|
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 bd9571mwv_gpio_id_table[] = { |
|
{ "bd9571mwv-gpio", ROHM_CHIP_TYPE_BD9571 }, |
|
{ "bd9574mwf-gpio", ROHM_CHIP_TYPE_BD9574 }, |
|
{ /* sentinel */ } |
|
}; |
|
MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table); |
|
|
|
static struct platform_driver bd9571mwv_gpio_driver = { |
|
.driver = { |
|
.name = "bd9571mwv-gpio", |
|
}, |
|
.probe = bd9571mwv_gpio_probe, |
|
.id_table = bd9571mwv_gpio_id_table, |
|
}; |
|
module_platform_driver(bd9571mwv_gpio_driver); |
|
|
|
MODULE_AUTHOR("Marek Vasut <[email protected]>"); |
|
MODULE_DESCRIPTION("BD9571MWV GPIO driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|