[linux.git] / drivers / gpio / gpio-tpic2810.c

/*
 * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
 *	Andrew F. Davis <[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.
 */

#include <linux/gpio/driver.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/mutex.h>

#define TPIC2810_WS_COMMAND 0x44

/**
 * struct tpic2810 - GPIO driver data
 * @chip: GPIO controller chip
 * @client: I2C device pointer
 * @buffer: Buffer for device register
 * @lock: Protects write sequences
 */
struct tpic2810 {
	struct gpio_chip chip;
	struct i2c_client *client;
	u8 buffer;
	struct mutex lock;
};

static void tpic2810_set(struct gpio_chip *chip, unsigned offset, int value);

static int tpic2810_get_direction(struct gpio_chip *chip,
				  unsigned offset)
{
	/* This device always output */
	return 0;
}

static int tpic2810_direction_input(struct gpio_chip *chip,
				    unsigned offset)
{
	/* This device is output only */
	return -EINVAL;
}

static int tpic2810_direction_output(struct gpio_chip *chip,
				     unsigned offset, int value)
{
	/* This device always output */
	tpic2810_set(chip, offset, value);
	return 0;
}

static void tpic2810_set_mask_bits(struct gpio_chip *chip, u8 mask, u8 bits)
{
	struct tpic2810 *gpio = gpiochip_get_data(chip);
	u8 buffer;
	int err;

	mutex_lock(&gpio->lock);

	buffer = gpio->buffer & ~mask;
	buffer |= (mask & bits);

	err = i2c_smbus_write_byte_data(gpio->client, TPIC2810_WS_COMMAND,
					buffer);
	if (!err)
		gpio->buffer = buffer;

	mutex_unlock(&gpio->lock);
}

static void tpic2810_set(struct gpio_chip *chip, unsigned offset, int value)
{
	tpic2810_set_mask_bits(chip, BIT(offset), value ? BIT(offset) : 0);
}

static void tpic2810_set_multiple(struct gpio_chip *chip, unsigned long *mask,
				  unsigned long *bits)
{
	tpic2810_set_mask_bits(chip, *mask, *bits);
}

static struct gpio_chip template_chip = {
	.label			= "tpic2810",
	.owner			= THIS_MODULE,
	.get_direction		= tpic2810_get_direction,
	.direction_input	= tpic2810_direction_input,
	.direction_output	= tpic2810_direction_output,
	.set			= tpic2810_set,
	.set_multiple		= tpic2810_set_multiple,
	.base			= -1,
	.ngpio			= 8,
	.can_sleep		= true,
};

static const struct of_device_id tpic2810_of_match_table[] = {
	{ .compatible = "ti,tpic2810" },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, tpic2810_of_match_table);

static int tpic2810_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	struct tpic2810 *gpio;
	int ret;

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

	i2c_set_clientdata(client, gpio);

	gpio->chip = template_chip;
	gpio->chip.parent = &client->dev;

	gpio->client = client;

	mutex_init(&gpio->lock);

	ret = gpiochip_add_data(&gpio->chip, gpio);
	if (ret < 0) {
		dev_err(&client->dev, "Unable to register gpiochip\n");
		return ret;
	}

	return 0;
}

static int tpic2810_remove(struct i2c_client *client)
{
	struct tpic2810 *gpio = i2c_get_clientdata(client);

	gpiochip_remove(&gpio->chip);

	return 0;
}

static const struct i2c_device_id tpic2810_id_table[] = {
	{ "tpic2810", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(i2c, tpic2810_id_table);

static struct i2c_driver tpic2810_driver = {
	.driver = {
		.name = "tpic2810",
		.of_match_table = tpic2810_of_match_table,
	},
	.probe = tpic2810_probe,
	.remove = tpic2810_remove,
	.id_table = tpic2810_id_table,
};
module_i2c_driver(tpic2810_driver);

MODULE_AUTHOR("Andrew F. Davis <[email protected]>");
MODULE_DESCRIPTION("TPIC2810 8-Bit LED Driver GPIO Driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
b866526d AD	1	/*
	2	* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
	3	* Andrew F. Davis <[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
	15	#include <linux/gpio/driver.h>
	16	#include <linux/i2c.h>
	17	#include <linux/module.h>
	18	#include <linux/mutex.h>
	19
	20	#define TPIC2810_WS_COMMAND 0x44
	21
	22	/**
	23	* struct tpic2810 - GPIO driver data
	24	* @chip: GPIO controller chip
	25	* @client: I2C device pointer
	26	* @buffer: Buffer for device register
	27	* @lock: Protects write sequences
	28	*/
	29	struct tpic2810 {
	30	struct gpio_chip chip;
	31	struct i2c_client *client;
	32	u8 buffer;
	33	struct mutex lock;
	34	};
	35
ce02d18f AL	36	static void tpic2810_set(struct gpio_chip *chip, unsigned offset, int value);
ce02d18f AL	37
b866526d AD	38	static int tpic2810_get_direction(struct gpio_chip *chip,
	39	unsigned offset)
	40	{
	41	/* This device always output */
	42	return 0;
	43	}
	44
	45	static int tpic2810_direction_input(struct gpio_chip *chip,
	46	unsigned offset)
	47	{
	48	/* This device is output only */
	49	return -EINVAL;
	50	}
	51
	52	static int tpic2810_direction_output(struct gpio_chip *chip,
	53	unsigned offset, int value)
	54	{
	55	/* This device always output */
ce02d18f	56	tpic2810_set(chip, offset, value);
b866526d AD	57	return 0;
	58	}
	59
6e66a659	60	static void tpic2810_set_mask_bits(struct gpio_chip *chip, u8 mask, u8 bits)
b866526d AD	61	{
b866526d AD	62	struct tpic2810 *gpio = gpiochip_get_data(chip);
6e66a659 AL	63	u8 buffer;
6e66a659 AL	64	int err;
b866526d AD	65
	66	mutex_lock(&gpio->lock);
	67
6e66a659 AL	68	buffer = gpio->buffer & ~mask;
6e66a659 AL	69	buffer \|= (mask & bits);
b866526d	70
6e66a659 AL	71	err = i2c_smbus_write_byte_data(gpio->client, TPIC2810_WS_COMMAND,
	72	buffer);
	73	if (!err)
	74	gpio->buffer = buffer;
b866526d AD	75
	76	mutex_unlock(&gpio->lock);
	77	}
	78
6e66a659 AL	79	static void tpic2810_set(struct gpio_chip *chip, unsigned offset, int value)
	80	{
	81	tpic2810_set_mask_bits(chip, BIT(offset), value ? BIT(offset) : 0);
	82	}
	83
b866526d AD	84	static void tpic2810_set_multiple(struct gpio_chip chip, unsigned long mask,
	85	unsigned long *bits)
	86	{
6e66a659	87	tpic2810_set_mask_bits(chip, mask, bits);
b866526d AD	88	}
	89
	90	static struct gpio_chip template_chip = {
	91	.label = "tpic2810",
	92	.owner = THIS_MODULE,
	93	.get_direction = tpic2810_get_direction,
	94	.direction_input = tpic2810_direction_input,
	95	.direction_output = tpic2810_direction_output,
	96	.set = tpic2810_set,
	97	.set_multiple = tpic2810_set_multiple,
	98	.base = -1,
	99	.ngpio = 8,
	100	.can_sleep = true,
	101	};
	102
	103	static const struct of_device_id tpic2810_of_match_table[] = {
	104	{ .compatible = "ti,tpic2810" },
	105	{ /* sentinel */ }
	106	};
	107	MODULE_DEVICE_TABLE(of, tpic2810_of_match_table);
	108
	109	static int tpic2810_probe(struct i2c_client *client,
	110	const struct i2c_device_id *id)
	111	{
	112	struct tpic2810 *gpio;
	113	int ret;
	114
	115	gpio = devm_kzalloc(&client->dev, sizeof(*gpio), GFP_KERNEL);
	116	if (!gpio)
	117	return -ENOMEM;
	118
	119	i2c_set_clientdata(client, gpio);
	120
	121	gpio->chip = template_chip;
	122	gpio->chip.parent = &client->dev;
	123
	124	gpio->client = client;
	125
	126	mutex_init(&gpio->lock);
	127
	128	ret = gpiochip_add_data(&gpio->chip, gpio);
	129	if (ret < 0) {
	130	dev_err(&client->dev, "Unable to register gpiochip\n");
	131	return ret;
	132	}
	133
	134	return 0;
	135	}
	136
	137	static int tpic2810_remove(struct i2c_client *client)
	138	{
	139	struct tpic2810 *gpio = i2c_get_clientdata(client);
	140
	141	gpiochip_remove(&gpio->chip);
	142
	143	return 0;
	144	}
	145
	146	static const struct i2c_device_id tpic2810_id_table[] = {
	147	{ "tpic2810", },
	148	{ /* sentinel */ }
	149	};
	150	MODULE_DEVICE_TABLE(i2c, tpic2810_id_table);
	151
152	static struct i2c_driver tpic2810_driver = {
153	.driver = {
154	.name = "tpic2810",
155	.of_match_table = tpic2810_of_match_table,
156	},
157	.probe = tpic2810_probe,
158	.remove = tpic2810_remove,
159	.id_table = tpic2810_id_table,
160	};
161	module_i2c_driver(tpic2810_driver);
162
163	MODULE_AUTHOR("Andrew F. Davis <[email protected]>");
164	MODULE_DESCRIPTION("TPIC2810 8-Bit LED Driver GPIO Driver");
165	MODULE_LICENSE("GPL v2");