[mirror_ubuntu-bionic-kernel.git] / drivers / gpio / gpio-tps6586x.c

/*
 * TI TPS6586x GPIO driver
 *
 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
 * Author: Laxman dewangan <ldewangan@nvidia.com>
 *
 * Based on tps6586x.c
 * Copyright (c) 2010 CompuLab Ltd.
 * Mike Rapoport <mike@compulab.co.il>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/errno.h>
#include <linux/gpio.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/mfd/tps6586x.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>

/* GPIO control registers */
#define TPS6586X_GPIOSET1	0x5d
#define TPS6586X_GPIOSET2	0x5e

struct tps6586x_gpio {
	struct gpio_chip gpio_chip;
	struct device *parent;
};

static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)
{
	struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
	uint8_t val;
	int ret;

	ret = tps6586x_read(tps6586x_gpio->parent, TPS6586X_GPIOSET2, &val);
	if (ret)
		return ret;

	return !!(val & (1 << offset));
}

static void tps6586x_gpio_set(struct gpio_chip *gc, unsigned offset,
			      int value)
{
	struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);

	tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET2,
			value << offset, 1 << offset);
}

static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset,
				int value)
{
	struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
	uint8_t val, mask;

	tps6586x_gpio_set(gc, offset, value);

	val = 0x1 << (offset * 2);
	mask = 0x3 << (offset * 2);

	return tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET1,
				val, mask);
}

static int tps6586x_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
{
	struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);

	return tps6586x_irq_get_virq(tps6586x_gpio->parent,
				TPS6586X_INT_PLDO_0 + offset);
}

static int tps6586x_gpio_probe(struct platform_device *pdev)
{
	struct tps6586x_platform_data *pdata;
	struct tps6586x_gpio *tps6586x_gpio;
	int ret;

	pdata = dev_get_platdata(pdev->dev.parent);
	tps6586x_gpio = devm_kzalloc(&pdev->dev,
				sizeof(*tps6586x_gpio), GFP_KERNEL);
	if (!tps6586x_gpio)
		return -ENOMEM;

	tps6586x_gpio->parent = pdev->dev.parent;

	tps6586x_gpio->gpio_chip.owner = THIS_MODULE;
	tps6586x_gpio->gpio_chip.label = pdev->name;
	tps6586x_gpio->gpio_chip.parent = &pdev->dev;
	tps6586x_gpio->gpio_chip.ngpio = 4;
	tps6586x_gpio->gpio_chip.can_sleep = true;

	/* FIXME: add handling of GPIOs as dedicated inputs */
	tps6586x_gpio->gpio_chip.direction_output = tps6586x_gpio_output;
	tps6586x_gpio->gpio_chip.set	= tps6586x_gpio_set;
	tps6586x_gpio->gpio_chip.get	= tps6586x_gpio_get;
	tps6586x_gpio->gpio_chip.to_irq	= tps6586x_gpio_to_irq;

#ifdef CONFIG_OF_GPIO
	tps6586x_gpio->gpio_chip.of_node = pdev->dev.parent->of_node;
#endif
	if (pdata && pdata->gpio_base)
		tps6586x_gpio->gpio_chip.base = pdata->gpio_base;
	else
		tps6586x_gpio->gpio_chip.base = -1;

	ret = devm_gpiochip_add_data(&pdev->dev, &tps6586x_gpio->gpio_chip,
				     tps6586x_gpio);
	if (ret < 0) {
		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
		return ret;
	}

	platform_set_drvdata(pdev, tps6586x_gpio);

	return ret;
}

static struct platform_driver tps6586x_gpio_driver = {
	.driver.name	= "tps6586x-gpio",
	.probe		= tps6586x_gpio_probe,
};

static int __init tps6586x_gpio_init(void)
{
	return platform_driver_register(&tps6586x_gpio_driver);
}
subsys_initcall(tps6586x_gpio_init);
Commit	Line	Data
72bd9860 LD	1	/*
	2	* TI TPS6586x GPIO driver
	3	*
	4	* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
	5	* Author: Laxman dewangan <ldewangan@nvidia.com>
	6	*
	7	* Based on tps6586x.c
	8	* Copyright (c) 2010 CompuLab Ltd.
	9	* Mike Rapoport <mike@compulab.co.il>
	10	*
	11	* This program is free software; you can redistribute it and/or modify it
	12	* under the terms and conditions of the GNU General Public License,
	13	* version 2, as published by the Free Software Foundation.
	14	*
	15	* This program is distributed in the hope it will be useful, but WITHOUT
	16	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	17	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	18	* more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	22	*/
	23
	24	#include <linux/errno.h>
	25	#include <linux/gpio.h>
	26	#include <linux/kernel.h>
a0e63738	27	#include <linux/init.h>
72bd9860 LD	28	#include <linux/mfd/tps6586x.h>
	29	#include <linux/of_device.h>
	30	#include <linux/platform_device.h>
	31
	32	/* GPIO control registers */
	33	#define TPS6586X_GPIOSET1 0x5d
	34	#define TPS6586X_GPIOSET2 0x5e
	35
	36	struct tps6586x_gpio {
	37	struct gpio_chip gpio_chip;
	38	struct device *parent;
	39	};
	40
72bd9860 LD	41	static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)
72bd9860 LD	42	{
94a90370	43	struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
72bd9860 LD	44	uint8_t val;
	45	int ret;
	46
	47	ret = tps6586x_read(tps6586x_gpio->parent, TPS6586X_GPIOSET2, &val);
	48	if (ret)
	49	return ret;
	50
	51	return !!(val & (1 << offset));
	52	}
	53
	54	static void tps6586x_gpio_set(struct gpio_chip *gc, unsigned offset,
	55	int value)
	56	{
94a90370	57	struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
72bd9860 LD	58
	59	tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET2,
	60	value << offset, 1 << offset);
	61	}
	62
	63	static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset,
	64	int value)
	65	{
94a90370	66	struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
72bd9860 LD	67	uint8_t val, mask;
	68
	69	tps6586x_gpio_set(gc, offset, value);
	70
	71	val = 0x1 << (offset * 2);
	72	mask = 0x3 << (offset * 2);
	73
	74	return tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET1,
	75	val, mask);
	76	}
	77
fe39f2f4 LD	78	static int tps6586x_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
fe39f2f4 LD	79	{
94a90370	80	struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
fe39f2f4 LD	81
	82	return tps6586x_irq_get_virq(tps6586x_gpio->parent,
	83	TPS6586X_INT_PLDO_0 + offset);
	84	}
	85
3836309d	86	static int tps6586x_gpio_probe(struct platform_device *pdev)
72bd9860 LD	87	{
	88	struct tps6586x_platform_data *pdata;
	89	struct tps6586x_gpio *tps6586x_gpio;
	90	int ret;
	91
	92	pdata = dev_get_platdata(pdev->dev.parent);
	93	tps6586x_gpio = devm_kzalloc(&pdev->dev,
	94	sizeof(*tps6586x_gpio), GFP_KERNEL);
e1ccdb82	95	if (!tps6586x_gpio)
72bd9860	96	return -ENOMEM;
72bd9860 LD	97
	98	tps6586x_gpio->parent = pdev->dev.parent;
	99
	100	tps6586x_gpio->gpio_chip.owner = THIS_MODULE;
	101	tps6586x_gpio->gpio_chip.label = pdev->name;
58383c78	102	tps6586x_gpio->gpio_chip.parent = &pdev->dev;
72bd9860	103	tps6586x_gpio->gpio_chip.ngpio = 4;
9fb1f39e	104	tps6586x_gpio->gpio_chip.can_sleep = true;
72bd9860 LD	105
	106	/* FIXME: add handling of GPIOs as dedicated inputs */
	107	tps6586x_gpio->gpio_chip.direction_output = tps6586x_gpio_output;
	108	tps6586x_gpio->gpio_chip.set = tps6586x_gpio_set;
	109	tps6586x_gpio->gpio_chip.get = tps6586x_gpio_get;
fe39f2f4	110	tps6586x_gpio->gpio_chip.to_irq = tps6586x_gpio_to_irq;
72bd9860 LD	111
	112	#ifdef CONFIG_OF_GPIO
	113	tps6586x_gpio->gpio_chip.of_node = pdev->dev.parent->of_node;
	114	#endif
	115	if (pdata && pdata->gpio_base)
	116	tps6586x_gpio->gpio_chip.base = pdata->gpio_base;
	117	else
	118	tps6586x_gpio->gpio_chip.base = -1;
	119
79c676f8 LD	120	ret = devm_gpiochip_add_data(&pdev->dev, &tps6586x_gpio->gpio_chip,
79c676f8 LD	121	tps6586x_gpio);
72bd9860 LD	122	if (ret < 0) {
	123	dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
	124	return ret;
	125	}
	126
	127	platform_set_drvdata(pdev, tps6586x_gpio);
	128
	129	return ret;
	130	}
	131
72bd9860 LD	132	static struct platform_driver tps6586x_gpio_driver = {
72bd9860 LD	133	.driver.name = "tps6586x-gpio",
72bd9860	134	.probe = tps6586x_gpio_probe,
72bd9860 LD	135	};
	136
	137	static int __init tps6586x_gpio_init(void)
	138	{
	139	return platform_driver_register(&tps6586x_gpio_driver);
	140	}
	141	subsys_initcall(tps6586x_gpio_init);