summaryrefslogtreecommitdiffstats
path: root/drivers/gpio/gpio-da9055.c
blob: b8d7570368871f0b6a94129253e567b98893208f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
/*
 * GPIO Driver for Dialog DA9055 PMICs.
 *
 * Copyright(c) 2012 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/platform_device.h>
#include <linux/gpio.h>

#include <linux/mfd/da9055/core.h>
#include <linux/mfd/da9055/reg.h>
#include <linux/mfd/da9055/pdata.h>

#define DA9055_VDD_IO			0x0
#define DA9055_PUSH_PULL		0x3
#define DA9055_ACT_LOW			0x0
#define DA9055_GPI			0x1
#define DA9055_PORT_MASK		0x3
#define DA9055_PORT_SHIFT(offset)	(4 * (offset % 2))

#define DA9055_INPUT			DA9055_GPI
#define DA9055_OUTPUT			DA9055_PUSH_PULL
#define DA9055_IRQ_GPI0			3

struct da9055_gpio {
	struct da9055 *da9055;
	struct gpio_chip gp;
};

static inline struct da9055_gpio *to_da9055_gpio(struct gpio_chip *chip)
{
	return container_of(chip, struct da9055_gpio, gp);
}

static int da9055_gpio_get(struct gpio_chip *gc, unsigned offset)
{
	struct da9055_gpio *gpio = to_da9055_gpio(gc);
	int gpio_direction = 0;
	int ret;

	/* Get GPIO direction */
	ret = da9055_reg_read(gpio->da9055, (offset >> 1) + DA9055_REG_GPIO0_1);
	if (ret < 0)
		return ret;

	gpio_direction = ret & (DA9055_PORT_MASK) << DA9055_PORT_SHIFT(offset);
	gpio_direction >>= DA9055_PORT_SHIFT(offset);
	switch (gpio_direction) {
	case DA9055_INPUT:
		ret = da9055_reg_read(gpio->da9055, DA9055_REG_STATUS_B);
		if (ret < 0)
			return ret;
		break;
	case DA9055_OUTPUT:
		ret = da9055_reg_read(gpio->da9055, DA9055_REG_GPIO_MODE0_2);
		if (ret < 0)
			return ret;
	}

	return ret & (1 << offset);

}

static void da9055_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
{
	struct da9055_gpio *gpio = to_da9055_gpio(gc);

	da9055_reg_update(gpio->da9055,
			DA9055_REG_GPIO_MODE0_2,
			1 << offset,
			value << offset);
}

static int da9055_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
{
	struct da9055_gpio *gpio = to_da9055_gpio(gc);
	unsigned char reg_byte;

	reg_byte = (DA9055_ACT_LOW | DA9055_GPI)
				<< DA9055_PORT_SHIFT(offset);

	return da9055_reg_update(gpio->da9055, (offset >> 1) +
				DA9055_REG_GPIO0_1,
				DA9055_PORT_MASK <<
				DA9055_PORT_SHIFT(offset),
				reg_byte);
}

static int da9055_gpio_direction_output(struct gpio_chip *gc,
					unsigned offset, int value)
{
	struct da9055_gpio *gpio = to_da9055_gpio(gc);
	unsigned char reg_byte;
	int ret;

	reg_byte = (DA9055_VDD_IO | DA9055_PUSH_PULL)
					<< DA9055_PORT_SHIFT(offset);

	ret = da9055_reg_update(gpio->da9055, (offset >> 1) +
				DA9055_REG_GPIO0_1,
				DA9055_PORT_MASK <<
				DA9055_PORT_SHIFT(offset),
				reg_byte);
	if (ret < 0)
		return ret;

	da9055_gpio_set(gc, offset, value);

	return 0;
}

static int da9055_gpio_to_irq(struct gpio_chip *gc, u32 offset)
{
	struct da9055_gpio *gpio = to_da9055_gpio(gc);
	struct da9055 *da9055 = gpio->da9055;

	return regmap_irq_get_virq(da9055->irq_data,
				  DA9055_IRQ_GPI0 + offset);
}

static struct gpio_chip reference_gp = {
	.label = "da9055-gpio",
	.owner = THIS_MODULE,
	.get = da9055_gpio_get,
	.set = da9055_gpio_set,
	.direction_input = da9055_gpio_direction_input,
	.direction_output = da9055_gpio_direction_output,
	.to_irq = da9055_gpio_to_irq,
	.can_sleep = true,
	.ngpio = 3,
	.base = -1,
};

static int da9055_gpio_probe(struct platform_device *pdev)
{
	struct da9055_gpio *gpio;
	struct da9055_pdata *pdata;
	int ret;

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

	gpio->da9055 = dev_get_drvdata(pdev->dev.parent);
	pdata = dev_get_platdata(gpio->da9055->dev);

	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:
	return ret;
}

static int da9055_gpio_remove(struct platform_device *pdev)
{
	struct da9055_gpio *gpio = platform_get_drvdata(pdev);

	gpiochip_remove(&gpio->gp);
	return 0;
}

static struct platform_driver da9055_gpio_driver = {
	.probe = da9055_gpio_probe,
	.remove = da9055_gpio_remove,
	.driver = {
		.name	= "da9055-gpio",
	},
};

static int __init da9055_gpio_init(void)
{
	return platform_driver_register(&da9055_gpio_driver);
}
subsys_initcall(da9055_gpio_init);

static void __exit da9055_gpio_exit(void)
{
	platform_driver_unregister(&da9055_gpio_driver);
}
module_exit(da9055_gpio_exit);

MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
MODULE_DESCRIPTION("DA9055 GPIO Device Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:da9055-gpio");