[linux-2.6-block.git] / drivers / gpio / gpio-altera-a10sr.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>

/**
 * 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.of_node = pdev->dev.of_node;

	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");
Commit	Line	Data
9952f691	1	// SPDX-License-Identifier: GPL-2.0-only
26a48c4c TT	2	/*
	3	* Copyright Intel Corporation (C) 2014-2016. All Rights Reserved
	4	*
26a48c4c TT	5	* GPIO driver for Altera Arria10 MAX5 System Resource Chip
	6	*
	7	* Adapted from gpio-tps65910.c
	8	*/
	9
	10	#include <linux/gpio/driver.h>
	11	#include <linux/mfd/altera-a10sr.h>
	12	#include <linux/module.h>
	13
	14	/**
	15	* struct altr_a10sr_gpio - Altera Max5 GPIO device private data structure
	16	* @gp: : instance of the gpio_chip
	17	* @regmap: the regmap from the parent device.
	18	*/
	19	struct altr_a10sr_gpio {
	20	struct gpio_chip gp;
	21	struct regmap *regmap;
	22	};
	23
	24	static int altr_a10sr_gpio_get(struct gpio_chip *chip, unsigned int offset)
	25	{
	26	struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip);
	27	int ret, val;
	28
	29	ret = regmap_read(gpio->regmap, ALTR_A10SR_PBDSW_REG, &val);
	30	if (ret < 0)
	31	return ret;
	32
	33	return !!(val & BIT(offset - ALTR_A10SR_LED_VALID_SHIFT));
	34	}
	35
	36	static void altr_a10sr_gpio_set(struct gpio_chip *chip, unsigned int offset,
	37	int value)
	38	{
	39	struct altr_a10sr_gpio *gpio = gpiochip_get_data(chip);
	40
	41	regmap_update_bits(gpio->regmap, ALTR_A10SR_LED_REG,
	42	BIT(ALTR_A10SR_LED_VALID_SHIFT + offset),
	43	value ? BIT(ALTR_A10SR_LED_VALID_SHIFT + offset)
	44	: 0);
	45	}
	46
	47	static int altr_a10sr_gpio_direction_input(struct gpio_chip *gc,
	48	unsigned int nr)
	49	{
68b7587b AL	50	if (nr < (ALTR_A10SR_IN_VALID_RANGE_LO - ALTR_A10SR_LED_VALID_SHIFT))
	51	return -EINVAL;
	52
	53	return 0;
26a48c4c TT	54	}
	55
	56	static int altr_a10sr_gpio_direction_output(struct gpio_chip *gc,
	57	unsigned int nr, int value)
	58	{
68b7587b AL	59	if (nr > (ALTR_A10SR_OUT_VALID_RANGE_HI - ALTR_A10SR_LED_VALID_SHIFT))
	60	return -EINVAL;
	61
	62	altr_a10sr_gpio_set(gc, nr, value);
	63	return 0;
26a48c4c TT	64	}
26a48c4c TT	65
1a20c3f8	66	static const struct gpio_chip altr_a10sr_gc = {
26a48c4c TT	67	.label = "altr_a10sr_gpio",
	68	.owner = THIS_MODULE,
	69	.get = altr_a10sr_gpio_get,
	70	.set = altr_a10sr_gpio_set,
	71	.direction_input = altr_a10sr_gpio_direction_input,
	72	.direction_output = altr_a10sr_gpio_direction_output,
	73	.can_sleep = true,
	74	.ngpio = 12,
	75	.base = -1,
	76	};
	77
	78	static int altr_a10sr_gpio_probe(struct platform_device *pdev)
	79	{
	80	struct altr_a10sr_gpio *gpio;
26a48c4c TT	81	struct altr_a10sr *a10sr = dev_get_drvdata(pdev->dev.parent);
	82
	83	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
	84	if (!gpio)
	85	return -ENOMEM;
	86
	87	gpio->regmap = a10sr->regmap;
	88
	89	gpio->gp = altr_a10sr_gc;
9ce9f799	90	gpio->gp.parent = pdev->dev.parent;
26a48c4c TT	91	gpio->gp.of_node = pdev->dev.of_node;
26a48c4c TT	92
aa93b0f3	93	return devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
26a48c4c TT	94	}
26a48c4c TT	95
26a48c4c TT	96	static const struct of_device_id altr_a10sr_gpio_of_match[] = {
	97	{ .compatible = "altr,a10sr-gpio" },
	98	{ },
	99	};
	100	MODULE_DEVICE_TABLE(of, altr_a10sr_gpio_of_match);
	101
	102	static struct platform_driver altr_a10sr_gpio_driver = {
	103	.probe = altr_a10sr_gpio_probe,
26a48c4c TT	104	.driver = {
	105	.name = "altr_a10sr_gpio",
	106	.of_match_table = of_match_ptr(altr_a10sr_gpio_of_match),
	107	},
	108	};
	109	module_platform_driver(altr_a10sr_gpio_driver);
	110
	111	MODULE_LICENSE("GPL v2");
	112	MODULE_AUTHOR("Thor Thayer <tthayer@opensource.altera.com>");
	113	MODULE_DESCRIPTION("Altera Arria10 System Resource Chip GPIO");