[linux.git] / drivers / gpio / gpio-lp873x.c

/*
 * Copyright (C) 2016 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 TPS65218 driver
 */

#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>

#include <linux/mfd/lp873x.h>

#define BITS_PER_GPO		0x4
#define LP873X_GPO_CTRL_OD	0x2

struct lp873x_gpio {
	struct gpio_chip chip;
	struct lp873x *lp873;
};

static int lp873x_gpio_get_direction(struct gpio_chip *chip,
				     unsigned int offset)
{
	/* This device is output only */
	return 0;
}

static int lp873x_gpio_direction_input(struct gpio_chip *chip,
				       unsigned int offset)
{
	/* This device is output only */
	return -EINVAL;
}

static int lp873x_gpio_direction_output(struct gpio_chip *chip,
					unsigned int offset, int value)
{
	struct lp873x_gpio *gpio = gpiochip_get_data(chip);

	/* Set the initial value */
	return regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL,
				  BIT(offset * BITS_PER_GPO),
				  value ? BIT(offset * BITS_PER_GPO) : 0);
}

static int lp873x_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
	struct lp873x_gpio *gpio = gpiochip_get_data(chip);
	int ret, val;

	ret = regmap_read(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, &val);
	if (ret < 0)
		return ret;

	return val & BIT(offset * BITS_PER_GPO);
}

static void lp873x_gpio_set(struct gpio_chip *chip, unsigned int offset,
			    int value)
{
	struct lp873x_gpio *gpio = gpiochip_get_data(chip);

	regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL,
			   BIT(offset * BITS_PER_GPO),
			   value ? BIT(offset * BITS_PER_GPO) : 0);
}

static int lp873x_gpio_request(struct gpio_chip *gc, unsigned int offset)
{
	struct lp873x_gpio *gpio = gpiochip_get_data(gc);
	int ret;

	switch (offset) {
	case 0:
		/* No MUX Set up Needed for GPO */
		break;
	case 1:
		/* Setup the CLKIN_PIN_SEL MUX to GPO2 */
		ret = regmap_update_bits(gpio->lp873->regmap, LP873X_REG_CONFIG,
					 LP873X_CONFIG_CLKIN_PIN_SEL, 0);
		if (ret)
			return ret;

		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int lp873x_gpio_set_config(struct gpio_chip *gc, unsigned offset,
				  unsigned long config)
{
	struct lp873x_gpio *gpio = gpiochip_get_data(gc);

	switch (pinconf_to_config_param(config)) {
	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
		return regmap_update_bits(gpio->lp873->regmap,
					  LP873X_REG_GPO_CTRL,
					  BIT(offset * BITS_PER_GPO +
					  LP873X_GPO_CTRL_OD),
					  BIT(offset * BITS_PER_GPO +
					  LP873X_GPO_CTRL_OD));

	case PIN_CONFIG_DRIVE_PUSH_PULL:
		return regmap_update_bits(gpio->lp873->regmap,
					  LP873X_REG_GPO_CTRL,
					  BIT(offset * BITS_PER_GPO +
					  LP873X_GPO_CTRL_OD), 0);
	default:
		return -ENOTSUPP;
	}
}

static const struct gpio_chip template_chip = {
	.label			= "lp873x-gpio",
	.owner			= THIS_MODULE,
	.request		= lp873x_gpio_request,
	.get_direction		= lp873x_gpio_get_direction,
	.direction_input	= lp873x_gpio_direction_input,
	.direction_output	= lp873x_gpio_direction_output,
	.get			= lp873x_gpio_get,
	.set			= lp873x_gpio_set,
	.set_config		= lp873x_gpio_set_config,
	.base			= -1,
	.ngpio			= 2,
	.can_sleep		= true,
};

static int lp873x_gpio_probe(struct platform_device *pdev)
{
	struct lp873x_gpio *gpio;
	int ret;

	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
	if (!gpio)
		return -ENOMEM;

	platform_set_drvdata(pdev, gpio);

	gpio->lp873 = dev_get_drvdata(pdev->dev.parent);
	gpio->chip = template_chip;
	gpio->chip.parent = gpio->lp873->dev;

	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 lp873x_gpio_id_table[] = {
	{ "lp873x-gpio", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, lp873x_gpio_id_table);

static struct platform_driver lp873x_gpio_driver = {
	.driver = {
		.name = "lp873x-gpio",
	},
	.probe = lp873x_gpio_probe,
	.id_table = lp873x_gpio_id_table,
};
module_platform_driver(lp873x_gpio_driver);

MODULE_AUTHOR("Keerthy <[email protected]>");
MODULE_DESCRIPTION("LP873X GPIO driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
83f14103 K	1	/*
	2	* Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/
	3	* Keerthy <[email protected]>
	4	*
	5	* This program is free software; you can redistribute it and/or
	6	* modify it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*
	9	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	10	* kind, whether expressed or implied; without even the implied warranty
	11	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License version 2 for more details.
	13	*
	14	* Based on the TPS65218 driver
	15	*/
	16
	17	#include <linux/gpio.h>
	18	#include <linux/module.h>
	19	#include <linux/platform_device.h>
	20	#include <linux/regmap.h>
	21
	22	#include <linux/mfd/lp873x.h>
	23
	24	#define BITS_PER_GPO 0x4
	25	#define LP873X_GPO_CTRL_OD 0x2
	26
	27	struct lp873x_gpio {
	28	struct gpio_chip chip;
	29	struct lp873x *lp873;
	30	};
	31
	32	static int lp873x_gpio_get_direction(struct gpio_chip *chip,
	33	unsigned int offset)
	34	{
	35	/* This device is output only */
	36	return 0;
	37	}
	38
	39	static int lp873x_gpio_direction_input(struct gpio_chip *chip,
	40	unsigned int offset)
	41	{
	42	/* This device is output only */
	43	return -EINVAL;
	44	}
	45
	46	static int lp873x_gpio_direction_output(struct gpio_chip *chip,
	47	unsigned int offset, int value)
	48	{
	49	struct lp873x_gpio *gpio = gpiochip_get_data(chip);
	50
	51	/* Set the initial value */
	52	return regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL,
	53	BIT(offset * BITS_PER_GPO),
	54	value ? BIT(offset * BITS_PER_GPO) : 0);
	55	}
	56
	57	static int lp873x_gpio_get(struct gpio_chip *chip, unsigned int offset)
	58	{
	59	struct lp873x_gpio *gpio = gpiochip_get_data(chip);
	60	int ret, val;
	61
	62	ret = regmap_read(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, &val);
	63	if (ret < 0)
	64	return ret;
65
66	return val & BIT(offset * BITS_PER_GPO);
67	}
68
69	static void lp873x_gpio_set(struct gpio_chip *chip, unsigned int offset,
70	int value)
71	{
72	struct lp873x_gpio *gpio = gpiochip_get_data(chip);
73
74	regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL,
75	BIT(offset * BITS_PER_GPO),
76	value ? BIT(offset * BITS_PER_GPO) : 0);
77	}
78
79	static int lp873x_gpio_request(struct gpio_chip *gc, unsigned int offset)
80	{
81	struct lp873x_gpio *gpio = gpiochip_get_data(gc);
82	int ret;
83
84	switch (offset) {
85	case 0:
86	/* No MUX Set up Needed for GPO */
87	break;
88	case 1:
89	/* Setup the CLKIN_PIN_SEL MUX to GPO2 */
90	ret = regmap_update_bits(gpio->lp873->regmap, LP873X_REG_CONFIG,
91	LP873X_CONFIG_CLKIN_PIN_SEL, 0);
92	if (ret)
93	return ret;
94
95	break;
96	default:
97	return -EINVAL;
98	}
99
100	return 0;
101	}
102
2956b5d9 MW	103	static int lp873x_gpio_set_config(struct gpio_chip *gc, unsigned offset,
2956b5d9 MW	104	unsigned long config)
83f14103 K	105	{
	106	struct lp873x_gpio *gpio = gpiochip_get_data(gc);
	107
2956b5d9 MW	108	switch (pinconf_to_config_param(config)) {
2956b5d9 MW	109	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
83f14103 K	110	return regmap_update_bits(gpio->lp873->regmap,
	111	LP873X_REG_GPO_CTRL,
	112	BIT(offset * BITS_PER_GPO +
	113	LP873X_GPO_CTRL_OD),
	114	BIT(offset * BITS_PER_GPO +
	115	LP873X_GPO_CTRL_OD));
2956b5d9 MW	116
2956b5d9 MW	117	case PIN_CONFIG_DRIVE_PUSH_PULL:
83f14103 K	118	return regmap_update_bits(gpio->lp873->regmap,
	119	LP873X_REG_GPO_CTRL,
	120	BIT(offset * BITS_PER_GPO +
	121	LP873X_GPO_CTRL_OD), 0);
	122	default:
	123	return -ENOTSUPP;
	124	}
	125	}
	126
e35b5ab0	127	static const struct gpio_chip template_chip = {
83f14103 K	128	.label = "lp873x-gpio",
	129	.owner = THIS_MODULE,
	130	.request = lp873x_gpio_request,
	131	.get_direction = lp873x_gpio_get_direction,
	132	.direction_input = lp873x_gpio_direction_input,
	133	.direction_output = lp873x_gpio_direction_output,
	134	.get = lp873x_gpio_get,
	135	.set = lp873x_gpio_set,
2956b5d9	136	.set_config = lp873x_gpio_set_config,
83f14103 K	137	.base = -1,
	138	.ngpio = 2,
	139	.can_sleep = true,
	140	};
	141
	142	static int lp873x_gpio_probe(struct platform_device *pdev)
	143	{
	144	struct lp873x_gpio *gpio;
	145	int ret;
	146
	147	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
	148	if (!gpio)
	149	return -ENOMEM;
	150
	151	platform_set_drvdata(pdev, gpio);
	152
	153	gpio->lp873 = dev_get_drvdata(pdev->dev.parent);
	154	gpio->chip = template_chip;
	155	gpio->chip.parent = gpio->lp873->dev;
	156
9d99c41a	157	ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
83f14103 K	158	if (ret < 0) {
	159	dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
	160	return ret;
	161	}
	162
	163	return 0;
	164	}
	165
83f14103 K	166	static const struct platform_device_id lp873x_gpio_id_table[] = {
	167	{ "lp873x-gpio", },
	168	{ /* sentinel */ }
	169	};
	170	MODULE_DEVICE_TABLE(platform, lp873x_gpio_id_table);
	171
	172	static struct platform_driver lp873x_gpio_driver = {
	173	.driver = {
	174	.name = "lp873x-gpio",
	175	},
	176	.probe = lp873x_gpio_probe,
83f14103 K	177	.id_table = lp873x_gpio_id_table,
	178	};
	179	module_platform_driver(lp873x_gpio_driver);
	180
	181	MODULE_AUTHOR("Keerthy <[email protected]>");
	182	MODULE_DESCRIPTION("LP873X GPIO driver");
	183	MODULE_LICENSE("GPL v2");