[linux-2.6-block.git] / drivers / gpio / gpio-da9052.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * GPIO Driver for Dialog DA9052 PMICs.
 *
 * Copyright(c) 2011 Dialog Semiconductor Ltd.
 *
 * Author: David Dajun Chen <dchen@diasemi.com>
 */
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/platform_device.h>
#include <linux/gpio/driver.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
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
07bfc915	2	/*
	3	* GPIO Driver for Dialog DA9052 PMICs.
	4	*
	5	* Copyright(c) 2011 Dialog Semiconductor Ltd.
	6	*
	7	* Author: David Dajun Chen <dchen@diasemi.com>
07bfc915	8	*/
	9	#include <linux/module.h>
	10	#include <linux/fs.h>
	11	#include <linux/uaccess.h>
	12	#include <linux/platform_device.h>
45e8bd9c	13	#include <linux/gpio/driver.h>
07bfc915	14	#include <linux/syscalls.h>
	15	#include <linux/seq_file.h>
	16
	17	#include <linux/mfd/da9052/da9052.h>
	18	#include <linux/mfd/da9052/reg.h>
	19	#include <linux/mfd/da9052/pdata.h>
07bfc915	20
	21	#define DA9052_INPUT 1
	22	#define DA9052_OUTPUT_OPENDRAIN 2
	23	#define DA9052_OUTPUT_PUSHPULL 3
	24
	25	#define DA9052_SUPPLY_VDD_IO1 0
	26
	27	#define DA9052_DEBOUNCING_OFF 0
	28	#define DA9052_DEBOUNCING_ON 1
	29
	30	#define DA9052_OUTPUT_LOWLEVEL 0
	31
	32	#define DA9052_ACTIVE_LOW 0
	33	#define DA9052_ACTIVE_HIGH 1
	34
	35	#define DA9052_GPIO_MAX_PORTS_PER_REGISTER 8
	36	#define DA9052_GPIO_SHIFT_COUNT(no) (no%8)
	37	#define DA9052_GPIO_MASK_UPPER_NIBBLE 0xF0
	38	#define DA9052_GPIO_MASK_LOWER_NIBBLE 0x0F
	39	#define DA9052_GPIO_NIBBLE_SHIFT 4
87b9b0e0 AJ	40	#define DA9052_IRQ_GPI0 16
	41	#define DA9052_GPIO_ODD_SHIFT 7
	42	#define DA9052_GPIO_EVEN_SHIFT 3
07bfc915	43
	44	struct da9052_gpio {
	45	struct da9052 *da9052;
	46	struct gpio_chip gp;
	47	};
	48
07bfc915	49	static unsigned char da9052_gpio_port_odd(unsigned offset)
	50	{
	51	return offset % 2;
	52	}
	53
	54	static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset)
	55	{
0f6082d2	56	struct da9052_gpio *gpio = gpiochip_get_data(gc);
07bfc915	57	int da9052_port_direction = 0;
	58	int ret;
	59
	60	ret = da9052_reg_read(gpio->da9052,
	61	DA9052_GPIO_0_1_REG + (offset >> 1));
	62	if (ret < 0)
	63	return ret;
	64
	65	if (da9052_gpio_port_odd(offset)) {
	66	da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN;
	67	da9052_port_direction >>= 4;
	68	} else {
	69	da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN;
	70	}
	71
	72	switch (da9052_port_direction) {
	73	case DA9052_INPUT:
	74	if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER)
	75	ret = da9052_reg_read(gpio->da9052,
	76	DA9052_STATUS_C_REG);
	77	else
	78	ret = da9052_reg_read(gpio->da9052,
	79	DA9052_STATUS_D_REG);
	80	if (ret < 0)
	81	return ret;
1f66adfb	82	return !!(ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset)));
07bfc915	83	case DA9052_OUTPUT_PUSHPULL:
07bfc915	84	if (da9052_gpio_port_odd(offset))
1f66adfb	85	return !!(ret & DA9052_GPIO_ODD_PORT_MODE);
07bfc915	86	else
1f66adfb	87	return !!(ret & DA9052_GPIO_EVEN_PORT_MODE);
07bfc915	88	default:
	89	return -EINVAL;
	90	}
	91	}
	92
	93	static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
	94	{
0f6082d2	95	struct da9052_gpio *gpio = gpiochip_get_data(gc);
07bfc915	96	int ret;
	97
	98	if (da9052_gpio_port_odd(offset)) {
07bfc915	99	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
	100	DA9052_GPIO_0_1_REG,
	101	DA9052_GPIO_ODD_PORT_MODE,
87b9b0e0	102	value << DA9052_GPIO_ODD_SHIFT);
07bfc915	103	if (ret != 0)
	104	dev_err(gpio->da9052->dev,
	105	"Failed to updated gpio odd reg,%d",
	106	ret);
07bfc915	107	} else {
07bfc915	108	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
	109	DA9052_GPIO_0_1_REG,
	110	DA9052_GPIO_EVEN_PORT_MODE,
87b9b0e0	111	value << DA9052_GPIO_EVEN_SHIFT);
07bfc915	112	if (ret != 0)
	113	dev_err(gpio->da9052->dev,
	114	"Failed to updated gpio even reg,%d",
	115	ret);
07bfc915	116	}
	117	}
	118
	119	static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
	120	{
0f6082d2	121	struct da9052_gpio *gpio = gpiochip_get_data(gc);
07bfc915	122	unsigned char register_value;
	123	int ret;
	124
	125	/* Format: function - 2 bits type - 1 bit mode - 1 bit */
	126	register_value = DA9052_INPUT \| DA9052_ACTIVE_LOW << 2 \|
	127	DA9052_DEBOUNCING_ON << 3;
	128
	129	if (da9052_gpio_port_odd(offset))
	130	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
	131	DA9052_GPIO_0_1_REG,
	132	DA9052_GPIO_MASK_UPPER_NIBBLE,
	133	(register_value <<
	134	DA9052_GPIO_NIBBLE_SHIFT));
	135	else
	136	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
	137	DA9052_GPIO_0_1_REG,
	138	DA9052_GPIO_MASK_LOWER_NIBBLE,
	139	register_value);
	140
	141	return ret;
	142	}
	143
	144	static int da9052_gpio_direction_output(struct gpio_chip *gc,
	145	unsigned offset, int value)
	146	{
0f6082d2	147	struct da9052_gpio *gpio = gpiochip_get_data(gc);
07bfc915	148	unsigned char register_value;
	149	int ret;
	150
	151	/* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */
	152	register_value = DA9052_OUTPUT_PUSHPULL \| DA9052_SUPPLY_VDD_IO1 << 2 \|
	153	value << 3;
	154
	155	if (da9052_gpio_port_odd(offset))
	156	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
	157	DA9052_GPIO_0_1_REG,
	158	DA9052_GPIO_MASK_UPPER_NIBBLE,
	159	(register_value <<
	160	DA9052_GPIO_NIBBLE_SHIFT));
	161	else
	162	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
	163	DA9052_GPIO_0_1_REG,
	164	DA9052_GPIO_MASK_LOWER_NIBBLE,
	165	register_value);
	166
	167	return ret;
	168	}
	169
	170	static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
	171	{
0f6082d2	172	struct da9052_gpio *gpio = gpiochip_get_data(gc);
07bfc915	173	struct da9052 *da9052 = gpio->da9052;
07bfc915	174
d511b9c3 FE	175	int irq;
	176
	177	irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset);
	178
	179	return irq;
07bfc915	180	}
07bfc915	181
e35b5ab0	182	static const struct gpio_chip reference_gp = {
07bfc915	183	.label = "da9052-gpio",
	184	.owner = THIS_MODULE,
	185	.get = da9052_gpio_get,
	186	.set = da9052_gpio_set,
	187	.direction_input = da9052_gpio_direction_input,
	188	.direction_output = da9052_gpio_direction_output,
	189	.to_irq = da9052_gpio_to_irq,
9fb1f39e	190	.can_sleep = true,
87b9b0e0 AJ	191	.ngpio = 16,
87b9b0e0 AJ	192	.base = -1,
07bfc915	193	};
07bfc915	194
3836309d	195	static int da9052_gpio_probe(struct platform_device *pdev)
07bfc915	196	{
	197	struct da9052_gpio *gpio;
	198	struct da9052_pdata *pdata;
	199	int ret;
	200
eb7cf95a	201	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
afeb7b45	202	if (!gpio)
07bfc915	203	return -ENOMEM;
	204
	205	gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
e56aee18	206	pdata = dev_get_platdata(gpio->da9052->dev);
07bfc915	207
07bfc915	208	gpio->gp = reference_gp;
	209	if (pdata && pdata->gpio_base)
	210	gpio->gp.base = pdata->gpio_base;
	211
b9cb1bb7	212	ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
07bfc915	213	if (ret < 0) {
07bfc915	214	dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
eb7cf95a	215	return ret;
07bfc915	216	}
	217
	218	platform_set_drvdata(pdev, gpio);
	219
	220	return 0;
07bfc915	221	}
07bfc915	222
07bfc915	223	static struct platform_driver da9052_gpio_driver = {
07bfc915	224	.probe = da9052_gpio_probe,
07bfc915	225	.driver = {
07bfc915	226	.name = "da9052-gpio",
07bfc915	227	},
	228	};
	229
6f61415e	230	module_platform_driver(da9052_gpio_driver);
07bfc915	231
	232	MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
	233	MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
	234	MODULE_LICENSE("GPL");
	235	MODULE_ALIAS("platform:da9052-gpio");