[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>
#include <linux/mfd/da9052/gpio.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

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);
	unsigned char register_value = 0;
	int ret;

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

	return da9052->irq_base + DA9052_IRQ_GPI0 + offset;
}

static struct gpio_chip reference_gp __devinitdata = {
	.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 __devinit da9052_gpio_probe(struct platform_device *pdev)
{
	struct da9052_gpio *gpio;
	struct da9052_pdata *pdata;
	int ret;

	gpio = kzalloc(sizeof(*gpio), GFP_KERNEL);
	if (gpio == NULL)
		return -ENOMEM;

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

	gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
	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);
		goto err_mem;
	}

	platform_set_drvdata(pdev, gpio);

	return 0;

err_mem:
	kfree(gpio);
	return ret;
}

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

	ret = gpiochip_remove(&gpio->gp);
	if (ret == 0)
		kfree(gpio);

	return ret;
}

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

static int __init da9052_gpio_init(void)
{
	return platform_driver_register(&da9052_gpio_driver);
}
module_init(da9052_gpio_init);

static void __exit da9052_gpio_exit(void)
{
	return platform_driver_unregister(&da9052_gpio_driver);
}
module_exit(da9052_gpio_exit);

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>
	25	#include <linux/mfd/da9052/gpio.h>
	26
	27	#define DA9052_INPUT 1
	28	#define DA9052_OUTPUT_OPENDRAIN 2
	29	#define DA9052_OUTPUT_PUSHPULL 3
	30
	31	#define DA9052_SUPPLY_VDD_IO1 0
	32
	33	#define DA9052_DEBOUNCING_OFF 0
	34	#define DA9052_DEBOUNCING_ON 1
	35
	36	#define DA9052_OUTPUT_LOWLEVEL 0
	37
	38	#define DA9052_ACTIVE_LOW 0
	39	#define DA9052_ACTIVE_HIGH 1
	40
	41	#define DA9052_GPIO_MAX_PORTS_PER_REGISTER 8
	42	#define DA9052_GPIO_SHIFT_COUNT(no) (no%8)
	43	#define DA9052_GPIO_MASK_UPPER_NIBBLE 0xF0
	44	#define DA9052_GPIO_MASK_LOWER_NIBBLE 0x0F
	45	#define DA9052_GPIO_NIBBLE_SHIFT 4
	46
	47	struct da9052_gpio {
	48	struct da9052 *da9052;
	49	struct gpio_chip gp;
	50	};
	51
	52	static inline struct da9052_gpio to_da9052_gpio(struct gpio_chip chip)
	53	{
	54	return container_of(chip, struct da9052_gpio, gp);
	55	}
	56
	57	static unsigned char da9052_gpio_port_odd(unsigned offset)
	58	{
	59	return offset % 2;
	60	}
	61
	62	static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset)
	63	{
	64	struct da9052_gpio *gpio = to_da9052_gpio(gc);
65	int da9052_port_direction = 0;
66	int ret;
67
68	ret = da9052_reg_read(gpio->da9052,
69	DA9052_GPIO_0_1_REG + (offset >> 1));
70	if (ret < 0)
71	return ret;
72
73	if (da9052_gpio_port_odd(offset)) {
74	da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN;
75	da9052_port_direction >>= 4;
76	} else {
77	da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN;
78	}
79
80	switch (da9052_port_direction) {
81	case DA9052_INPUT:
82	if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER)
83	ret = da9052_reg_read(gpio->da9052,
84	DA9052_STATUS_C_REG);
85	else
86	ret = da9052_reg_read(gpio->da9052,
87	DA9052_STATUS_D_REG);
88	if (ret < 0)
89	return ret;
90	if (ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset)))
91	return 1;
92	else
93	return 0;
94	case DA9052_OUTPUT_PUSHPULL:
95	if (da9052_gpio_port_odd(offset))
96	return ret & DA9052_GPIO_ODD_PORT_MODE;
97	else
98	return ret & DA9052_GPIO_EVEN_PORT_MODE;
99	default:
100	return -EINVAL;
101	}
102	}
103
104	static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
105	{
106	struct da9052_gpio *gpio = to_da9052_gpio(gc);
107	unsigned char register_value = 0;
108	int ret;
109
110	if (da9052_gpio_port_odd(offset)) {
111	if (value) {
112	register_value = DA9052_GPIO_ODD_PORT_MODE;
113	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
114	DA9052_GPIO_0_1_REG,
115	DA9052_GPIO_ODD_PORT_MODE,
116	register_value);
117	if (ret != 0)
118	dev_err(gpio->da9052->dev,
119	"Failed to updated gpio odd reg,%d",
120	ret);
121	}
122	} else {
123	if (value) {
124	register_value = DA9052_GPIO_EVEN_PORT_MODE;
125	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
126	DA9052_GPIO_0_1_REG,
127	DA9052_GPIO_EVEN_PORT_MODE,
128	register_value);
129	if (ret != 0)
130	dev_err(gpio->da9052->dev,
131	"Failed to updated gpio even reg,%d",
132	ret);
133	}
134	}
135	}
136
137	static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
138	{
139	struct da9052_gpio *gpio = to_da9052_gpio(gc);
140	unsigned char register_value;
141	int ret;
142
143	/* Format: function - 2 bits type - 1 bit mode - 1 bit */
144	register_value = DA9052_INPUT \| DA9052_ACTIVE_LOW << 2 \|
145	DA9052_DEBOUNCING_ON << 3;
146
147	if (da9052_gpio_port_odd(offset))
148	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
149	DA9052_GPIO_0_1_REG,
150	DA9052_GPIO_MASK_UPPER_NIBBLE,
151	(register_value <<
152	DA9052_GPIO_NIBBLE_SHIFT));
153	else
154	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
155	DA9052_GPIO_0_1_REG,
156	DA9052_GPIO_MASK_LOWER_NIBBLE,
157	register_value);
158
159	return ret;
160	}
161
162	static int da9052_gpio_direction_output(struct gpio_chip *gc,
163	unsigned offset, int value)
164	{
165	struct da9052_gpio *gpio = to_da9052_gpio(gc);
166	unsigned char register_value;
167	int ret;
168
169	/* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */
170	register_value = DA9052_OUTPUT_PUSHPULL \| DA9052_SUPPLY_VDD_IO1 << 2 \|
171	value << 3;
172
173	if (da9052_gpio_port_odd(offset))
174	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
175	DA9052_GPIO_0_1_REG,
176	DA9052_GPIO_MASK_UPPER_NIBBLE,
177	(register_value <<
178	DA9052_GPIO_NIBBLE_SHIFT));
179	else
180	ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
181	DA9052_GPIO_0_1_REG,
182	DA9052_GPIO_MASK_LOWER_NIBBLE,
183	register_value);
184
185	return ret;
186	}
187
188	static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
189	{
190	struct da9052_gpio *gpio = to_da9052_gpio(gc);
191	struct da9052 *da9052 = gpio->da9052;
192
193	return da9052->irq_base + DA9052_IRQ_GPI0 + offset;
194	}
195
196	static struct gpio_chip reference_gp __devinitdata = {
197	.label = "da9052-gpio",
198	.owner = THIS_MODULE,
199	.get = da9052_gpio_get,
200	.set = da9052_gpio_set,
201	.direction_input = da9052_gpio_direction_input,
202	.direction_output = da9052_gpio_direction_output,
203	.to_irq = da9052_gpio_to_irq,
204	.can_sleep = 1;
205	.ngpio = 16;
206	.base = -1;
207	};
208
209	static int __devinit da9052_gpio_probe(struct platform_device *pdev)
210	{
211	struct da9052_gpio *gpio;
212	struct da9052_pdata *pdata;
213	int ret;
214
215	gpio = kzalloc(sizeof(*gpio), GFP_KERNEL);
216	if (gpio == NULL)
217	return -ENOMEM;
218
219	gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
220	pdata = gpio->da9052->dev->platform_data;
221
222	gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
223	gpio->gp = reference_gp;
224	if (pdata && pdata->gpio_base)
225	gpio->gp.base = pdata->gpio_base;
226
227	ret = gpiochip_add(&gpio->gp);
228	if (ret < 0) {
229	dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
230	goto err_mem;
231	}
232
233	platform_set_drvdata(pdev, gpio);
234
235	return 0;
236
237	err_mem:
238	kfree(gpio);
239	return ret;
240	}
241
242	static int __devexit da9052_gpio_remove(struct platform_device *pdev)
243	{
244	struct da9052_gpio *gpio = platform_get_drvdata(pdev);
245	int ret;
246
247	ret = gpiochip_remove(&gpio->gp);
248	if (ret == 0)
249	kfree(gpio);
250
251	return ret;
252	}
253
254	static struct platform_driver da9052_gpio_driver = {
255	.probe = da9052_gpio_probe,
256	.remove = __devexit_p(da9052_gpio_remove),
257	.driver = {
258	.name = "da9052-gpio",
259	.owner = THIS_MODULE,
260	},
261	};
262
263	static int __init da9052_gpio_init(void)
264	{
265	return platform_driver_register(&da9052_gpio_driver);
266	}
267	module_init(da9052_gpio_init);
268
269	static void __exit da9052_gpio_exit(void)
270	{
271	return platform_driver_unregister(&da9052_gpio_driver);
272	}
273	module_exit(da9052_gpio_exit);
274
275	MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
276	MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
277	MODULE_LICENSE("GPL");
278	MODULE_ALIAS("platform:da9052-gpio");