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.
195 lines
4.7 KiB
195 lines
4.7 KiB
/* |
|
* Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/ |
|
* Keerthy <[email protected]> |
|
* |
|
* 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_GOIO1_OD)), |
|
BIT(offset + |
|
__ffs(LP87565_GOIO1_OD))); |
|
case PIN_CONFIG_DRIVE_PUSH_PULL: |
|
return regmap_update_bits(gpio->map, |
|
LP87565_REG_GPIO_CONFIG, |
|
BIT(offset + |
|
__ffs(LP87565_GOIO1_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 <[email protected]>"); |
|
MODULE_DESCRIPTION("LP87565 GPIO driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|