115 lines
2.9 KiB
C
115 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright Intel Corporation (C) 2014-2016. All Rights Reserved
|
|
*
|
|
* GPIO driver for Altera Arria10 MAX5 System Resource Chip
|
|
*
|
|
* Adapted from gpio-tps65910.c
|
|
*/
|
|
|
|
#include <linux/gpio/driver.h>
|
|
#include <linux/mfd/altera-a10sr.h>
|
|
#include <linux/module.h>
|
|
#include <linux/property.h>
|
|
|
|
/**
|
|
* struct altr_a10sr_gpio - Altera Max5 GPIO device private data structure
|
|
* @gp: : instance of the gpio_chip
|
|
* @regmap: the regmap from the parent device.
|
|
*/
|
|
struct altr_a10sr_gpio {
|
|
struct gpio_chip gp;
|
|
struct regmap *regmap;
|
|
};
|
|
|
|
static int altr_a10sr_gpio_get(struct gpio_chip *chip, unsigned int offset)
|
|
{
|
|
struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip);
|
|
int ret, val;
|
|
|
|
ret = regmap_read(gpio->regmap, ALTR_A10SR_PBDSW_REG, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return !!(val & BIT(offset - ALTR_A10SR_LED_VALID_SHIFT));
|
|
}
|
|
|
|
static void altr_a10sr_gpio_set(struct gpio_chip *chip, unsigned int offset,
|
|
int value)
|
|
{
|
|
struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip);
|
|
|
|
regmap_update_bits(gpio->regmap, ALTR_A10SR_LED_REG,
|
|
BIT(ALTR_A10SR_LED_VALID_SHIFT + offset),
|
|
value ? BIT(ALTR_A10SR_LED_VALID_SHIFT + offset)
|
|
: 0);
|
|
}
|
|
|
|
static int altr_a10sr_gpio_direction_input(struct gpio_chip *gc,
|
|
unsigned int nr)
|
|
{
|
|
if (nr < (ALTR_A10SR_IN_VALID_RANGE_LO - ALTR_A10SR_LED_VALID_SHIFT))
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int altr_a10sr_gpio_direction_output(struct gpio_chip *gc,
|
|
unsigned int nr, int value)
|
|
{
|
|
if (nr > (ALTR_A10SR_OUT_VALID_RANGE_HI - ALTR_A10SR_LED_VALID_SHIFT))
|
|
return -EINVAL;
|
|
|
|
altr_a10sr_gpio_set(gc, nr, value);
|
|
return 0;
|
|
}
|
|
|
|
static const struct gpio_chip altr_a10sr_gc = {
|
|
.label = "altr_a10sr_gpio",
|
|
.owner = THIS_MODULE,
|
|
.get = altr_a10sr_gpio_get,
|
|
.set = altr_a10sr_gpio_set,
|
|
.direction_input = altr_a10sr_gpio_direction_input,
|
|
.direction_output = altr_a10sr_gpio_direction_output,
|
|
.can_sleep = true,
|
|
.ngpio = 12,
|
|
.base = -1,
|
|
};
|
|
|
|
static int altr_a10sr_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct altr_a10sr_gpio *gpio;
|
|
struct altr_a10sr *a10sr = dev_get_drvdata(pdev->dev.parent);
|
|
|
|
gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
|
|
if (!gpio)
|
|
return -ENOMEM;
|
|
|
|
gpio->regmap = a10sr->regmap;
|
|
|
|
gpio->gp = altr_a10sr_gc;
|
|
gpio->gp.parent = pdev->dev.parent;
|
|
gpio->gp.fwnode = dev_fwnode(&pdev->dev);
|
|
|
|
return devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
|
|
}
|
|
|
|
static const struct of_device_id altr_a10sr_gpio_of_match[] = {
|
|
{ .compatible = "altr,a10sr-gpio" },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, altr_a10sr_gpio_of_match);
|
|
|
|
static struct platform_driver altr_a10sr_gpio_driver = {
|
|
.probe = altr_a10sr_gpio_probe,
|
|
.driver = {
|
|
.name = "altr_a10sr_gpio",
|
|
.of_match_table = of_match_ptr(altr_a10sr_gpio_of_match),
|
|
},
|
|
};
|
|
module_platform_driver(altr_a10sr_gpio_driver);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Thor Thayer <tthayer@opensource.altera.com>");
|
|
MODULE_DESCRIPTION("Altera Arria10 System Resource Chip GPIO");
|