[thirdparty/kernel/stable.git] / drivers / gpio / gpio-mc9s08dz60.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright 2009-2012 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * Author: Wu Guoxing <b39297@freescale.com>
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/gpio/driver.h>

#define GPIO_GROUP_NUM 2
#define GPIO_NUM_PER_GROUP 8
#define GPIO_NUM (GPIO_GROUP_NUM*GPIO_NUM_PER_GROUP)

struct mc9s08dz60 {
	struct i2c_client *client;
	struct gpio_chip chip;
};

static void mc9s_gpio_to_reg_and_bit(int offset, u8 *reg, u8 *bit)
{
	*reg = 0x20 + offset / GPIO_NUM_PER_GROUP;
	*bit = offset % GPIO_NUM_PER_GROUP;
}

static int mc9s08dz60_get_value(struct gpio_chip *gc, unsigned offset)
{
	u8 reg, bit;
	s32 value;
	struct mc9s08dz60 *mc9s = gpiochip_get_data(gc);

	mc9s_gpio_to_reg_and_bit(offset, &reg, &bit);
	value = i2c_smbus_read_byte_data(mc9s->client, reg);

	return (value >= 0) ? (value >> bit) & 0x1 : 0;
}

static int mc9s08dz60_set(struct mc9s08dz60 *mc9s, unsigned offset, int val)
{
	u8 reg, bit;
	s32 value;

	mc9s_gpio_to_reg_and_bit(offset, &reg, &bit);
	value = i2c_smbus_read_byte_data(mc9s->client, reg);
	if (value >= 0) {
		if (val)
			value |= 1 << bit;
		else
			value &= ~(1 << bit);

		return i2c_smbus_write_byte_data(mc9s->client, reg, value);
	} else
		return value;

}


static void mc9s08dz60_set_value(struct gpio_chip *gc, unsigned offset, int val)
{
	struct mc9s08dz60 *mc9s = gpiochip_get_data(gc);

	mc9s08dz60_set(mc9s, offset, val);
}

static int mc9s08dz60_direction_output(struct gpio_chip *gc,
				       unsigned offset, int val)
{
	struct mc9s08dz60 *mc9s = gpiochip_get_data(gc);

	return mc9s08dz60_set(mc9s, offset, val);
}

static int mc9s08dz60_probe(struct i2c_client *client,
			    const struct i2c_device_id *id)
{
	struct mc9s08dz60 *mc9s;

	mc9s = devm_kzalloc(&client->dev, sizeof(*mc9s), GFP_KERNEL);
	if (!mc9s)
		return -ENOMEM;

	mc9s->chip.label = client->name;
	mc9s->chip.base = -1;
	mc9s->chip.parent = &client->dev;
	mc9s->chip.owner = THIS_MODULE;
	mc9s->chip.ngpio = GPIO_NUM;
	mc9s->chip.can_sleep = true;
	mc9s->chip.get = mc9s08dz60_get_value;
	mc9s->chip.set = mc9s08dz60_set_value;
	mc9s->chip.direction_output = mc9s08dz60_direction_output;
	mc9s->client = client;
	i2c_set_clientdata(client, mc9s);

	return devm_gpiochip_add_data(&client->dev, &mc9s->chip, mc9s);
}

static const struct i2c_device_id mc9s08dz60_id[] = {
	{"mc9s08dz60", 0},
	{},
};

static struct i2c_driver mc9s08dz60_i2c_driver = {
	.driver = {
		.name = "mc9s08dz60",
	},
	.probe = mc9s08dz60_probe,
	.id_table = mc9s08dz60_id,
};
builtin_i2c_driver(mc9s08dz60_i2c_driver);
Commit	Line	Data
c942fddf	1	// SPDX-License-Identifier: GPL-2.0-or-later
608589b1	2	/*
	3	* Copyright 2009-2012 Freescale Semiconductor, Inc. All Rights Reserved.
	4	*
	5	* Author: Wu Guoxing <b39297@freescale.com>
608589b1	6	*/
	7
	8	#include <linux/kernel.h>
0de6a80d	9	#include <linux/init.h>
608589b1	10	#include <linux/slab.h>
608589b1	11	#include <linux/i2c.h>
3dc1c92f	12	#include <linux/gpio/driver.h>
608589b1	13
	14	#define GPIO_GROUP_NUM 2
	15	#define GPIO_NUM_PER_GROUP 8
	16	#define GPIO_NUM (GPIO_GROUP_NUM*GPIO_NUM_PER_GROUP)
	17
	18	struct mc9s08dz60 {
	19	struct i2c_client *client;
	20	struct gpio_chip chip;
	21	};
	22
608589b1	23	static void mc9s_gpio_to_reg_and_bit(int offset, u8 reg, u8 bit)
	24	{
	25	*reg = 0x20 + offset / GPIO_NUM_PER_GROUP;
	26	*bit = offset % GPIO_NUM_PER_GROUP;
	27	}
	28
	29	static int mc9s08dz60_get_value(struct gpio_chip *gc, unsigned offset)
	30	{
	31	u8 reg, bit;
	32	s32 value;
cf90c9e3	33	struct mc9s08dz60 *mc9s = gpiochip_get_data(gc);
608589b1	34
	35	mc9s_gpio_to_reg_and_bit(offset, &reg, &bit);
	36	value = i2c_smbus_read_byte_data(mc9s->client, reg);
	37
	38	return (value >= 0) ? (value >> bit) & 0x1 : 0;
	39	}
	40
	41	static int mc9s08dz60_set(struct mc9s08dz60 *mc9s, unsigned offset, int val)
	42	{
	43	u8 reg, bit;
	44	s32 value;
	45
	46	mc9s_gpio_to_reg_and_bit(offset, &reg, &bit);
	47	value = i2c_smbus_read_byte_data(mc9s->client, reg);
	48	if (value >= 0) {
	49	if (val)
	50	value \|= 1 << bit;
	51	else
	52	value &= ~(1 << bit);
	53
	54	return i2c_smbus_write_byte_data(mc9s->client, reg, value);
	55	} else
	56	return value;
	57
	58	}
	59
	60
	61	static void mc9s08dz60_set_value(struct gpio_chip *gc, unsigned offset, int val)
	62	{
cf90c9e3	63	struct mc9s08dz60 *mc9s = gpiochip_get_data(gc);
608589b1	64
	65	mc9s08dz60_set(mc9s, offset, val);
	66	}
	67
	68	static int mc9s08dz60_direction_output(struct gpio_chip *gc,
	69	unsigned offset, int val)
	70	{
cf90c9e3	71	struct mc9s08dz60 *mc9s = gpiochip_get_data(gc);
608589b1	72
	73	return mc9s08dz60_set(mc9s, offset, val);
	74	}
	75
	76	static int mc9s08dz60_probe(struct i2c_client *client,
	77	const struct i2c_device_id *id)
	78	{
608589b1	79	struct mc9s08dz60 *mc9s;
608589b1	80
3c7051d7	81	mc9s = devm_kzalloc(&client->dev, sizeof(*mc9s), GFP_KERNEL);
608589b1	82	if (!mc9s)
	83	return -ENOMEM;
	84
	85	mc9s->chip.label = client->name;
	86	mc9s->chip.base = -1;
58383c78	87	mc9s->chip.parent = &client->dev;
608589b1	88	mc9s->chip.owner = THIS_MODULE;
608589b1	89	mc9s->chip.ngpio = GPIO_NUM;
9fb1f39e	90	mc9s->chip.can_sleep = true;
608589b1	91	mc9s->chip.get = mc9s08dz60_get_value;
	92	mc9s->chip.set = mc9s08dz60_set_value;
	93	mc9s->chip.direction_output = mc9s08dz60_direction_output;
	94	mc9s->client = client;
	95	i2c_set_clientdata(client, mc9s);
	96
7d645df0	97	return devm_gpiochip_add_data(&client->dev, &mc9s->chip, mc9s);
608589b1	98	}
	99
	100	static const struct i2c_device_id mc9s08dz60_id[] = {
	101	{"mc9s08dz60", 0},
	102	{},
	103	};
	104
608589b1	105	static struct i2c_driver mc9s08dz60_i2c_driver = {
608589b1	106	.driver = {
608589b1	107	.name = "mc9s08dz60",
	108	},
	109	.probe = mc9s08dz60_probe,
608589b1	110	.id_table = mc9s08dz60_id,
608589b1	111	};
0de6a80d	112	builtin_i2c_driver(mc9s08dz60_i2c_driver);