1/*
2 * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
3 * Keerthy <j-keerthy@ti.com>
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
10 * kind, whether expressed or implied; without even the implied warranty
11 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License version 2 for more details.
13 *
14 * Based on the LP873X driver
15 */
16
17#include <linux/gpio/driver.h>
18#include <linux/module.h>
19#include <linux/platform_device.h>
20#include <linux/regmap.h>
21
22#include <linux/mfd/lp87565.h>
23
24struct lp87565_gpio {
25 struct gpio_chip chip;
26 struct regmap *map;
27};
28
29static int lp87565_gpio_get(struct gpio_chip *chip, unsigned int offset)
30{
31 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
32 int ret, val;
33
34 ret = regmap_read(gpio->map, LP87565_REG_GPIO_IN, &val);
35 if (ret < 0)
36 return ret;
37
38 return !!(val & BIT(offset));
39}
40
41static void lp87565_gpio_set(struct gpio_chip *chip, unsigned int offset,
42 int value)
43{
44 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
45
46 regmap_update_bits(gpio->map, LP87565_REG_GPIO_OUT,
47 BIT(offset), value ? BIT(offset) : 0);
48}
49
50static int lp87565_gpio_get_direction(struct gpio_chip *chip,
51 unsigned int offset)
52{
53 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
54 int ret, val;
55
56 ret = regmap_read(gpio->map, LP87565_REG_GPIO_CONFIG, &val);
57 if (ret < 0)
58 return ret;
59
60 return !(val & BIT(offset));
61}
62
63static int lp87565_gpio_direction_input(struct gpio_chip *chip,
64 unsigned int offset)
65{
66 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
67
68 return regmap_update_bits(gpio->map,
69 LP87565_REG_GPIO_CONFIG,
70 BIT(offset), 0);
71}
72
73static int lp87565_gpio_direction_output(struct gpio_chip *chip,
74 unsigned int offset, int value)
75{
76 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
77
78 lp87565_gpio_set(chip, offset, value);
79
80 return regmap_update_bits(gpio->map,
81 LP87565_REG_GPIO_CONFIG,
82 BIT(offset), BIT(offset));
83}
84
85static int lp87565_gpio_request(struct gpio_chip *gc, unsigned int offset)
86{
87 struct lp87565_gpio *gpio = gpiochip_get_data(gc);
88 int ret;
89
90 switch (offset) {
91 case 0:
92 case 1:
93 case 2:
94 /*
95 * MUX can program the pin to be in EN1/2/3 pin mode
96 * Or GPIO1/2/3 mode.
97 * Setup the GPIO*_SEL MUX to GPIO mode
98 */
99 ret = regmap_update_bits(gpio->map,
100 LP87565_REG_PIN_FUNCTION,
101 BIT(offset), BIT(offset));
102 if (ret)
103 return ret;
104
105 break;
106 default:
107 return -EINVAL;
108 }
109
110 return 0;
111}
112
113static int lp87565_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
114 unsigned long config)
115{
116 struct lp87565_gpio *gpio = gpiochip_get_data(gc);
117
118 switch (pinconf_to_config_param(config)) {
119 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
120 return regmap_update_bits(gpio->map,
121 LP87565_REG_GPIO_CONFIG,
122 BIT(offset +
123 __ffs(LP87565_GOIO1_OD)),
124 BIT(offset +
125 __ffs(LP87565_GOIO1_OD)));
126 case PIN_CONFIG_DRIVE_PUSH_PULL:
127 return regmap_update_bits(gpio->map,
128 LP87565_REG_GPIO_CONFIG,
129 BIT(offset +
130 __ffs(LP87565_GOIO1_OD)), 0);
131 default:
132 return -ENOTSUPP;
133 }
134}
135
136static const struct gpio_chip template_chip = {
137 .label = "lp87565-gpio",
138 .owner = THIS_MODULE,
139 .request = lp87565_gpio_request,
140 .get_direction = lp87565_gpio_get_direction,
141 .direction_input = lp87565_gpio_direction_input,
142 .direction_output = lp87565_gpio_direction_output,
143 .get = lp87565_gpio_get,
144 .set = lp87565_gpio_set,
145 .set_config = lp87565_gpio_set_config,
146 .base = -1,
147 .ngpio = 3,
148 .can_sleep = true,
149};
150
151static int lp87565_gpio_probe(struct platform_device *pdev)
152{
153 struct lp87565_gpio *gpio;
154 struct lp87565 *lp87565;
155 int ret;
156
157 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
158 if (!gpio)
159 return -ENOMEM;
160
161 lp87565 = dev_get_drvdata(pdev->dev.parent);
162 gpio->chip = template_chip;
163 gpio->chip.parent = lp87565->dev;
164 gpio->map = lp87565->regmap;
165
166 ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
167 if (ret < 0) {
168 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
169 return ret;
170 }
171
172 return 0;
173}
174
175static const struct platform_device_id lp87565_gpio_id_table[] = {
176 { "lp87565-q1-gpio", },
177 { /* sentinel */ }
178};
179MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table);
180
181static struct platform_driver lp87565_gpio_driver = {
182 .driver = {
183 .name = "lp87565-gpio",
184 },
185 .probe = lp87565_gpio_probe,
186 .id_table = lp87565_gpio_id_table,
187};
188module_platform_driver(lp87565_gpio_driver);
189
190MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
191MODULE_DESCRIPTION("LP87565 GPIO driver");
192MODULE_LICENSE("GPL v2");
193