[GitHub/mt8127/android_kernel_alcatel_ttab.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 inline struct da9052_gpio *to_da9052_gpio(struct gpio_chip *chip)
{
	return container_of(chip, struct da9052_gpio, 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 = to_da9052_gpio(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;
		if (ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset)))
			return 1;
		else
			return 0;
	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 = to_da9052_gpio(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 = to_da9052_gpio(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 = to_da9052_gpio(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 = to_da9052_gpio(gc);
	struct da9052 *da9052 = gpio->da9052;

	int irq;

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

	return irq;
}

static 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 = 1,
	.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 == NULL)
		return -ENOMEM;

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

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

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

	platform_set_drvdata(pdev, gpio);

	return 0;
}

static int da9052_gpio_remove(struct platform_device *pdev)
{
	struct da9052_gpio *gpio = platform_get_drvdata(pdev);

	return gpiochip_remove(&gpio->gp);
}

static struct platform_driver da9052_gpio_driver = {
	.probe = da9052_gpio_probe,
	.remove = da9052_gpio_remove,
	.driver = {
		.name	= "da9052-gpio",
		.owner	= THIS_MODULE,
	},
};

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
	54	static inline struct da9052_gpio to_da9052_gpio(struct gpio_chip chip)
	55	{
	56	return container_of(chip, struct da9052_gpio, gp);
	57	}
	58
	59	static unsigned char da9052_gpio_port_odd(unsigned offset)
	60	{
	61	return offset % 2;
	62	}
	63
	64	static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset)
	65	{
	66	struct da9052_gpio *gpio = to_da9052_gpio(gc);
	67	int da9052_port_direction = 0;
	68	int ret;
	69
	70	ret = da9052_reg_read(gpio->da9052,
	71	DA9052_GPIO_0_1_REG + (offset >> 1));
	72	if (ret < 0)
	73	return ret;
	74
	75	if (da9052_gpio_port_odd(offset)) {
	76	da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN;
	77	da9052_port_direction >>= 4;
	78	} else {
	79	da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN;
	80	}
	81
	82	switch (da9052_port_direction) {
	83	case DA9052_INPUT:
	84	if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER)
	85	ret = da9052_reg_read(gpio->da9052,
	86	DA9052_STATUS_C_REG);
	87	else
	88	ret = da9052_reg_read(gpio->da9052,
	89	DA9052_STATUS_D_REG);
	90	if (ret < 0)
	91	return ret;
	92	if (ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset)))
	93	return 1;
	94	else
	95	return 0;
	96	case DA9052_OUTPUT_PUSHPULL:
	97	if (da9052_gpio_port_odd(offset))
	98	return ret & DA9052_GPIO_ODD_PORT_MODE;
	99	else
	100	return ret & DA9052_GPIO_EVEN_PORT_MODE;
	101	default:
	102	return -EINVAL;
	103	}
	104	}
	105
	106	static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
	107	{
	108	struct da9052_gpio *gpio = to_da9052_gpio(gc);
07bfc915	109	int ret;
	110
	111	if (da9052_gpio_port_odd(offset)) {
07bfc915	112	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
	113	DA9052_GPIO_0_1_REG,
	114	DA9052_GPIO_ODD_PORT_MODE,
87b9b0e0	115	value << DA9052_GPIO_ODD_SHIFT);
07bfc915	116	if (ret != 0)
	117	dev_err(gpio->da9052->dev,
	118	"Failed to updated gpio odd reg,%d",
	119	ret);
07bfc915	120	} else {
07bfc915	121	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
	122	DA9052_GPIO_0_1_REG,
	123	DA9052_GPIO_EVEN_PORT_MODE,
87b9b0e0	124	value << DA9052_GPIO_EVEN_SHIFT);
07bfc915	125	if (ret != 0)
	126	dev_err(gpio->da9052->dev,
	127	"Failed to updated gpio even reg,%d",
	128	ret);
07bfc915	129	}
	130	}
	131
	132	static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
	133	{
	134	struct da9052_gpio *gpio = to_da9052_gpio(gc);
	135	unsigned char register_value;
	136	int ret;
	137
	138	/* Format: function - 2 bits type - 1 bit mode - 1 bit */
	139	register_value = DA9052_INPUT \| DA9052_ACTIVE_LOW << 2 \|
	140	DA9052_DEBOUNCING_ON << 3;
	141
	142	if (da9052_gpio_port_odd(offset))
	143	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
	144	DA9052_GPIO_0_1_REG,
	145	DA9052_GPIO_MASK_UPPER_NIBBLE,
	146	(register_value <<
	147	DA9052_GPIO_NIBBLE_SHIFT));
	148	else
	149	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
	150	DA9052_GPIO_0_1_REG,
	151	DA9052_GPIO_MASK_LOWER_NIBBLE,
	152	register_value);
	153
	154	return ret;
	155	}
	156
	157	static int da9052_gpio_direction_output(struct gpio_chip *gc,
	158	unsigned offset, int value)
	159	{
	160	struct da9052_gpio *gpio = to_da9052_gpio(gc);
	161	unsigned char register_value;
	162	int ret;
	163
	164	/* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */
	165	register_value = DA9052_OUTPUT_PUSHPULL \| DA9052_SUPPLY_VDD_IO1 << 2 \|
	166	value << 3;
	167
	168	if (da9052_gpio_port_odd(offset))
	169	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
	170	DA9052_GPIO_0_1_REG,
	171	DA9052_GPIO_MASK_UPPER_NIBBLE,
	172	(register_value <<
	173	DA9052_GPIO_NIBBLE_SHIFT));
	174	else
	175	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
	176	DA9052_GPIO_0_1_REG,
	177	DA9052_GPIO_MASK_LOWER_NIBBLE,
	178	register_value);
	179
	180	return ret;
	181	}
	182
	183	static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
	184	{
	185	struct da9052_gpio *gpio = to_da9052_gpio(gc);
	186	struct da9052 *da9052 = gpio->da9052;
	187
d511b9c3 FE	188	int irq;
	189
	190	irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset);
	191
	192	return irq;
07bfc915	193	}
07bfc915	194
aeca8ad1	195	static struct gpio_chip reference_gp = {
07bfc915	196	.label = "da9052-gpio",
	197	.owner = THIS_MODULE,
	198	.get = da9052_gpio_get,
	199	.set = da9052_gpio_set,
	200	.direction_input = da9052_gpio_direction_input,
	201	.direction_output = da9052_gpio_direction_output,
	202	.to_irq = da9052_gpio_to_irq,
87b9b0e0 AJ	203	.can_sleep = 1,
	204	.ngpio = 16,
	205	.base = -1,
07bfc915	206	};
07bfc915	207
3836309d	208	static int da9052_gpio_probe(struct platform_device *pdev)
07bfc915	209	{
	210	struct da9052_gpio *gpio;
	211	struct da9052_pdata *pdata;
	212	int ret;
	213
eb7cf95a	214	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
07bfc915	215	if (gpio == NULL)
	216	return -ENOMEM;
	217
	218	gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
	219	pdata = gpio->da9052->dev->platform_data;
	220
07bfc915	221	gpio->gp = reference_gp;
	222	if (pdata && pdata->gpio_base)
	223	gpio->gp.base = pdata->gpio_base;
	224
	225	ret = gpiochip_add(&gpio->gp);
	226	if (ret < 0) {
	227	dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
eb7cf95a	228	return ret;
07bfc915	229	}
	230
	231	platform_set_drvdata(pdev, gpio);
	232
	233	return 0;
07bfc915	234	}
07bfc915	235
206210ce	236	static int da9052_gpio_remove(struct platform_device *pdev)
07bfc915	237	{
07bfc915	238	struct da9052_gpio *gpio = platform_get_drvdata(pdev);
07bfc915	239
eb7cf95a	240	return gpiochip_remove(&gpio->gp);
07bfc915	241	}
	242
	243	static struct platform_driver da9052_gpio_driver = {
	244	.probe = da9052_gpio_probe,
8283c4ff	245	.remove = da9052_gpio_remove,
07bfc915	246	.driver = {
	247	.name = "da9052-gpio",
	248	.owner = THIS_MODULE,
	249	},
	250	};
	251
6f61415e	252	module_platform_driver(da9052_gpio_driver);
07bfc915	253
	254	MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
	255	MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
	256	MODULE_LICENSE("GPL");
	257	MODULE_ALIAS("platform:da9052-gpio");