aboutsummaryrefslogtreecommitdiff
path: root/drivers/gpio/gpio-lp87565.c
blob: a121c8f1061005380464d4cf96ac68a4905b293c (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
/*
 * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
 *	Keerthy <j-keerthy@ti.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether expressed or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License version 2 for more details.
 *
 * Based on the LP873X driver
 */

#include <linux/gpio/driver.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>

#include <linux/mfd/lp87565.h>

struct lp87565_gpio {
	struct gpio_chip chip;
	struct regmap *map;
};

static int lp87565_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
	struct lp87565_gpio *gpio = gpiochip_get_data(chip);
	int ret, val;

	ret = regmap_read(gpio->map, LP87565_REG_GPIO_IN, &val);
	if (ret < 0)
		return ret;

	return !!(val & BIT(offset));
}

static void lp87565_gpio_set(struct gpio_chip *chip, unsigned int offset,
			     int value)
{
	struct lp87565_gpio *gpio = gpiochip_get_data(chip);

	regmap_update_bits(gpio->map, LP87565_REG_GPIO_OUT,
			   BIT(offset), value ? BIT(offset) : 0);
}

static int lp87565_gpio_get_direction(struct gpio_chip *chip,
				      unsigned int offset)
{
	struct lp87565_gpio *gpio = gpiochip_get_data(chip);
	int ret, val;

	ret = regmap_read(gpio->map, LP87565_REG_GPIO_CONFIG, &val);
	if (ret < 0)
		return ret;

	return !(val & BIT(offset));
}

static int lp87565_gpio_direction_input(struct gpio_chip *chip,
					unsigned int offset)
{
	struct lp87565_gpio *gpio = gpiochip_get_data(chip);

	return regmap_update_bits(gpio->map,
				  LP87565_REG_GPIO_CONFIG,
				  BIT(offset), 0);
}

static int lp87565_gpio_direction_output(struct gpio_chip *chip,
					 unsigned int offset, int value)
{
	struct lp87565_gpio *gpio = gpiochip_get_data(chip);

	lp87565_gpio_set(chip, offset, value);

	return regmap_update_bits(gpio->map,
				  LP87565_REG_GPIO_CONFIG,
				  BIT(offset), BIT(offset));
}

static int lp87565_gpio_request(struct gpio_chip *gc, unsigned int offset)
{
	struct lp87565_gpio *gpio = gpiochip_get_data(gc);
	int ret;

	switch (offset) {
	case 0:
	case 1:
	case 2:
		/*
		 * MUX can program the pin to be in EN1/2/3 pin mode
		 * Or GPIO1/2/3 mode.
		 * Setup the GPIO*_SEL MUX to GPIO mode
		 */
		ret = regmap_update_bits(gpio->map,
					 LP87565_REG_PIN_FUNCTION,
					 BIT(offset), BIT(offset));
		if (ret)
			return ret;

		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int lp87565_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
				   unsigned long config)
{
	struct lp87565_gpio *gpio = gpiochip_get_data(gc);

	switch (pinconf_to_config_param(config)) {
	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
		return regmap_update_bits(gpio->map,
					  LP87565_REG_GPIO_CONFIG,
					  BIT(offset +
					      __ffs(LP87565_GOIO1_OD)),
					  BIT(offset +
					      __ffs(LP87565_GOIO1_OD)));
	case PIN_CONFIG_DRIVE_PUSH_PULL:
		return regmap_update_bits(gpio->map,
					  LP87565_REG_GPIO_CONFIG,
					  BIT(offset +
					      __ffs(LP87565_GOIO1_OD)), 0);
	default:
		return -ENOTSUPP;
	}
}

static const struct gpio_chip template_chip = {
	.label			= "lp87565-gpio",
	.owner			= THIS_MODULE,
	.request		= lp87565_gpio_request,
	.get_direction		= lp87565_gpio_get_direction,
	.direction_input	= lp87565_gpio_direction_input,
	.direction_output	= lp87565_gpio_direction_output,
	.get			= lp87565_gpio_get,
	.set			= lp87565_gpio_set,
	.set_config		= lp87565_gpio_set_config,
	.base			= -1,
	.ngpio			= 3,
	.can_sleep		= true,
};

static int lp87565_gpio_probe(struct platform_device *pdev)
{
	struct lp87565_gpio *gpio;
	struct lp87565 *lp87565;
	int ret;

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

	lp87565 = dev_get_drvdata(pdev->dev.parent);
	gpio->chip = template_chip;
	gpio->chip.parent = lp87565->dev;
	gpio->map = lp87565->regmap;

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

	return 0;
}

static const struct platform_device_id lp87565_gpio_id_table[] = {
	{ "lp87565-q1-gpio", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table);

static struct platform_driver lp87565_gpio_driver = {
	.driver = {
		.name = "lp87565-gpio",
	},
	.probe = lp87565_gpio_probe,
	.id_table = lp87565_gpio_id_table,
};
module_platform_driver(lp87565_gpio_driver);

MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
MODULE_DESCRIPTION("LP87565 GPIO driver");
MODULE_LICENSE("GPL v2");