[mirror_ubuntu-bionic-kernel.git] / drivers / gpio / gpio-da9052.c

/*
 * GPIO Driver for Dialog DA9052 PMICs.
 *
 * Copyright(c) 2011 Dialog Semiconductor Ltd.
 *
 * Author: David Dajun Chen <dchen@diasemi.com>
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 */
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/syscalls.h>
#include <linux/seq_file.h>

#include <linux/mfd/da9052/da9052.h>
#include <linux/mfd/da9052/reg.h>
#include <linux/mfd/da9052/pdata.h>

#define DA9052_INPUT				1
#define DA9052_OUTPUT_OPENDRAIN		2
#define DA9052_OUTPUT_PUSHPULL			3

#define DA9052_SUPPLY_VDD_IO1			0

#define DA9052_DEBOUNCING_OFF			0
#define DA9052_DEBOUNCING_ON			1

#define DA9052_OUTPUT_LOWLEVEL			0

#define DA9052_ACTIVE_LOW			0
#define DA9052_ACTIVE_HIGH			1

#define DA9052_GPIO_MAX_PORTS_PER_REGISTER	8
#define DA9052_GPIO_SHIFT_COUNT(no)		(no%8)
#define DA9052_GPIO_MASK_UPPER_NIBBLE		0xF0
#define DA9052_GPIO_MASK_LOWER_NIBBLE		0x0F
#define DA9052_GPIO_NIBBLE_SHIFT		4
#define DA9052_IRQ_GPI0			16
#define DA9052_GPIO_ODD_SHIFT			7
#define DA9052_GPIO_EVEN_SHIFT			3

struct da9052_gpio {
	struct da9052 *da9052;
	struct gpio_chip gp;
};

static unsigned char da9052_gpio_port_odd(unsigned offset)
{
	return offset % 2;
}

static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset)
{
	struct da9052_gpio *gpio = gpiochip_get_data(gc);
	int da9052_port_direction = 0;
	int ret;

	ret = da9052_reg_read(gpio->da9052,
			      DA9052_GPIO_0_1_REG + (offset >> 1));
	if (ret < 0)
		return ret;

	if (da9052_gpio_port_odd(offset)) {
		da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN;
		da9052_port_direction >>= 4;
	} else {
		da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN;
	}

	switch (da9052_port_direction) {
	case DA9052_INPUT:
		if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER)
			ret = da9052_reg_read(gpio->da9052,
					      DA9052_STATUS_C_REG);
		else
			ret = da9052_reg_read(gpio->da9052,
					      DA9052_STATUS_D_REG);
		if (ret < 0)
			return ret;
		return !!(ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset)));
	case DA9052_OUTPUT_PUSHPULL:
		if (da9052_gpio_port_odd(offset))
			return !!(ret & DA9052_GPIO_ODD_PORT_MODE);
		else
			return !!(ret & DA9052_GPIO_EVEN_PORT_MODE);
	default:
		return -EINVAL;
	}
}

static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
{
	struct da9052_gpio *gpio = gpiochip_get_data(gc);
	int ret;

	if (da9052_gpio_port_odd(offset)) {
			ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
						DA9052_GPIO_0_1_REG,
						DA9052_GPIO_ODD_PORT_MODE,
						value << DA9052_GPIO_ODD_SHIFT);
			if (ret != 0)
				dev_err(gpio->da9052->dev,
					"Failed to updated gpio odd reg,%d",
					ret);
	} else {
			ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
						DA9052_GPIO_0_1_REG,
						DA9052_GPIO_EVEN_PORT_MODE,
						value << DA9052_GPIO_EVEN_SHIFT);
			if (ret != 0)
				dev_err(gpio->da9052->dev,
					"Failed to updated gpio even reg,%d",
					ret);
	}
}

static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
{
	struct da9052_gpio *gpio = gpiochip_get_data(gc);
	unsigned char register_value;
	int ret;

	/* Format: function - 2 bits type - 1 bit mode - 1 bit */
	register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 |
			 DA9052_DEBOUNCING_ON << 3;

	if (da9052_gpio_port_odd(offset))
		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
					DA9052_GPIO_0_1_REG,
					DA9052_GPIO_MASK_UPPER_NIBBLE,
					(register_value <<
					DA9052_GPIO_NIBBLE_SHIFT));
	else
		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
					DA9052_GPIO_0_1_REG,
					DA9052_GPIO_MASK_LOWER_NIBBLE,
					register_value);

	return ret;
}

static int da9052_gpio_direction_output(struct gpio_chip *gc,
					unsigned offset, int value)
{
	struct da9052_gpio *gpio = gpiochip_get_data(gc);
	unsigned char register_value;
	int ret;

	/* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */
	register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 |
			 value << 3;

	if (da9052_gpio_port_odd(offset))
		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
					DA9052_GPIO_0_1_REG,
					DA9052_GPIO_MASK_UPPER_NIBBLE,
					(register_value <<
					DA9052_GPIO_NIBBLE_SHIFT));
	else
		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
					DA9052_GPIO_0_1_REG,
					DA9052_GPIO_MASK_LOWER_NIBBLE,
					register_value);

	return ret;
}

static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
{
	struct da9052_gpio *gpio = gpiochip_get_data(gc);
	struct da9052 *da9052 = gpio->da9052;

	int irq;

	irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset);

	return irq;
}

static const struct gpio_chip reference_gp = {
	.label = "da9052-gpio",
	.owner = THIS_MODULE,
	.get = da9052_gpio_get,
	.set = da9052_gpio_set,
	.direction_input = da9052_gpio_direction_input,
	.direction_output = da9052_gpio_direction_output,
	.to_irq = da9052_gpio_to_irq,
	.can_sleep = true,
	.ngpio = 16,
	.base = -1,
};

static int da9052_gpio_probe(struct platform_device *pdev)
{
	struct da9052_gpio *gpio;
	struct da9052_pdata *pdata;
	int ret;

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

	gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
	pdata = dev_get_platdata(gpio->da9052->dev);

	gpio->gp = reference_gp;
	if (pdata && pdata->gpio_base)
		gpio->gp.base = pdata->gpio_base;

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

	platform_set_drvdata(pdev, gpio);

	return 0;
}

static struct platform_driver da9052_gpio_driver = {
	.probe = da9052_gpio_probe,
	.driver = {
		.name	= "da9052-gpio",
	},
};

module_platform_driver(da9052_gpio_driver);

MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:da9052-gpio");
Commit	Line	Data
07bfc915	1	/*
	2	* GPIO Driver for Dialog DA9052 PMICs.
	3	*
	4	* Copyright(c) 2011 Dialog Semiconductor Ltd.
	5	*
	6	* Author: David Dajun Chen <dchen@diasemi.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*
	13	*/
	14	#include <linux/module.h>
	15	#include <linux/fs.h>
	16	#include <linux/uaccess.h>
	17	#include <linux/platform_device.h>
	18	#include <linux/gpio.h>
	19	#include <linux/syscalls.h>
	20	#include <linux/seq_file.h>
	21
	22	#include <linux/mfd/da9052/da9052.h>
	23	#include <linux/mfd/da9052/reg.h>
	24	#include <linux/mfd/da9052/pdata.h>
07bfc915	25
	26	#define DA9052_INPUT 1
	27	#define DA9052_OUTPUT_OPENDRAIN 2
	28	#define DA9052_OUTPUT_PUSHPULL 3
	29
	30	#define DA9052_SUPPLY_VDD_IO1 0
	31
	32	#define DA9052_DEBOUNCING_OFF 0
	33	#define DA9052_DEBOUNCING_ON 1
	34
	35	#define DA9052_OUTPUT_LOWLEVEL 0
	36
	37	#define DA9052_ACTIVE_LOW 0
	38	#define DA9052_ACTIVE_HIGH 1
	39
	40	#define DA9052_GPIO_MAX_PORTS_PER_REGISTER 8
	41	#define DA9052_GPIO_SHIFT_COUNT(no) (no%8)
	42	#define DA9052_GPIO_MASK_UPPER_NIBBLE 0xF0
	43	#define DA9052_GPIO_MASK_LOWER_NIBBLE 0x0F
	44	#define DA9052_GPIO_NIBBLE_SHIFT 4
87b9b0e0 AJ	45	#define DA9052_IRQ_GPI0 16
	46	#define DA9052_GPIO_ODD_SHIFT 7
	47	#define DA9052_GPIO_EVEN_SHIFT 3
07bfc915	48
	49	struct da9052_gpio {
	50	struct da9052 *da9052;
	51	struct gpio_chip gp;
	52	};
	53
07bfc915	54	static unsigned char da9052_gpio_port_odd(unsigned offset)
	55	{
	56	return offset % 2;
	57	}
	58
	59	static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset)
	60	{
0f6082d2	61	struct da9052_gpio *gpio = gpiochip_get_data(gc);
07bfc915	62	int da9052_port_direction = 0;
	63	int ret;
	64
	65	ret = da9052_reg_read(gpio->da9052,
	66	DA9052_GPIO_0_1_REG + (offset >> 1));
	67	if (ret < 0)
	68	return ret;
	69
	70	if (da9052_gpio_port_odd(offset)) {
	71	da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN;
	72	da9052_port_direction >>= 4;
	73	} else {
	74	da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN;
	75	}
	76
	77	switch (da9052_port_direction) {
	78	case DA9052_INPUT:
	79	if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER)
	80	ret = da9052_reg_read(gpio->da9052,
	81	DA9052_STATUS_C_REG);
	82	else
	83	ret = da9052_reg_read(gpio->da9052,
	84	DA9052_STATUS_D_REG);
	85	if (ret < 0)
	86	return ret;
1f66adfb	87	return !!(ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset)));
07bfc915	88	case DA9052_OUTPUT_PUSHPULL:
07bfc915	89	if (da9052_gpio_port_odd(offset))
1f66adfb	90	return !!(ret & DA9052_GPIO_ODD_PORT_MODE);
07bfc915	91	else
1f66adfb	92	return !!(ret & DA9052_GPIO_EVEN_PORT_MODE);
07bfc915	93	default:
	94	return -EINVAL;
	95	}
	96	}
	97
	98	static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
	99	{
0f6082d2	100	struct da9052_gpio *gpio = gpiochip_get_data(gc);
07bfc915	101	int ret;
	102
	103	if (da9052_gpio_port_odd(offset)) {
07bfc915	104	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
	105	DA9052_GPIO_0_1_REG,
	106	DA9052_GPIO_ODD_PORT_MODE,
87b9b0e0	107	value << DA9052_GPIO_ODD_SHIFT);
07bfc915	108	if (ret != 0)
	109	dev_err(gpio->da9052->dev,
	110	"Failed to updated gpio odd reg,%d",
	111	ret);
07bfc915	112	} else {
07bfc915	113	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
	114	DA9052_GPIO_0_1_REG,
	115	DA9052_GPIO_EVEN_PORT_MODE,
87b9b0e0	116	value << DA9052_GPIO_EVEN_SHIFT);
07bfc915	117	if (ret != 0)
	118	dev_err(gpio->da9052->dev,
	119	"Failed to updated gpio even reg,%d",
	120	ret);
07bfc915	121	}
	122	}
	123
	124	static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
	125	{
0f6082d2	126	struct da9052_gpio *gpio = gpiochip_get_data(gc);
07bfc915	127	unsigned char register_value;
	128	int ret;
	129
	130	/* Format: function - 2 bits type - 1 bit mode - 1 bit */
	131	register_value = DA9052_INPUT \| DA9052_ACTIVE_LOW << 2 \|
	132	DA9052_DEBOUNCING_ON << 3;
	133
	134	if (da9052_gpio_port_odd(offset))
	135	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
	136	DA9052_GPIO_0_1_REG,
	137	DA9052_GPIO_MASK_UPPER_NIBBLE,
	138	(register_value <<
	139	DA9052_GPIO_NIBBLE_SHIFT));
	140	else
	141	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
	142	DA9052_GPIO_0_1_REG,
	143	DA9052_GPIO_MASK_LOWER_NIBBLE,
	144	register_value);
	145
	146	return ret;
	147	}
	148
	149	static int da9052_gpio_direction_output(struct gpio_chip *gc,
	150	unsigned offset, int value)
	151	{
0f6082d2	152	struct da9052_gpio *gpio = gpiochip_get_data(gc);
07bfc915	153	unsigned char register_value;
	154	int ret;
	155
	156	/* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */
	157	register_value = DA9052_OUTPUT_PUSHPULL \| DA9052_SUPPLY_VDD_IO1 << 2 \|
	158	value << 3;
	159
	160	if (da9052_gpio_port_odd(offset))
	161	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
	162	DA9052_GPIO_0_1_REG,
	163	DA9052_GPIO_MASK_UPPER_NIBBLE,
	164	(register_value <<
	165	DA9052_GPIO_NIBBLE_SHIFT));
	166	else
	167	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
	168	DA9052_GPIO_0_1_REG,
	169	DA9052_GPIO_MASK_LOWER_NIBBLE,
	170	register_value);
	171
	172	return ret;
	173	}
	174
	175	static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
	176	{
0f6082d2	177	struct da9052_gpio *gpio = gpiochip_get_data(gc);
07bfc915	178	struct da9052 *da9052 = gpio->da9052;
07bfc915	179
d511b9c3 FE	180	int irq;
	181
	182	irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset);
	183
	184	return irq;
07bfc915	185	}
07bfc915	186
e35b5ab0	187	static const struct gpio_chip reference_gp = {
07bfc915	188	.label = "da9052-gpio",
	189	.owner = THIS_MODULE,
	190	.get = da9052_gpio_get,
	191	.set = da9052_gpio_set,
	192	.direction_input = da9052_gpio_direction_input,
	193	.direction_output = da9052_gpio_direction_output,
	194	.to_irq = da9052_gpio_to_irq,
9fb1f39e	195	.can_sleep = true,
87b9b0e0 AJ	196	.ngpio = 16,
87b9b0e0 AJ	197	.base = -1,
07bfc915	198	};
07bfc915	199
3836309d	200	static int da9052_gpio_probe(struct platform_device *pdev)
07bfc915	201	{
	202	struct da9052_gpio *gpio;
	203	struct da9052_pdata *pdata;
	204	int ret;
	205
eb7cf95a	206	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
afeb7b45	207	if (!gpio)
07bfc915	208	return -ENOMEM;
	209
	210	gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
e56aee18	211	pdata = dev_get_platdata(gpio->da9052->dev);
07bfc915	212
07bfc915	213	gpio->gp = reference_gp;
	214	if (pdata && pdata->gpio_base)
	215	gpio->gp.base = pdata->gpio_base;
	216
b9cb1bb7	217	ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
07bfc915	218	if (ret < 0) {
07bfc915	219	dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
eb7cf95a	220	return ret;
07bfc915	221	}
	222
	223	platform_set_drvdata(pdev, gpio);
	224
	225	return 0;
07bfc915	226	}
07bfc915	227
07bfc915	228	static struct platform_driver da9052_gpio_driver = {
07bfc915	229	.probe = da9052_gpio_probe,
07bfc915	230	.driver = {
07bfc915	231	.name = "da9052-gpio",
07bfc915	232	},
	233	};
	234
6f61415e	235	module_platform_driver(da9052_gpio_driver);
07bfc915	236
	237	MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
	238	MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
	239	MODULE_LICENSE("GPL");
	240	MODULE_ALIAS("platform:da9052-gpio");