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
24 struct lp87565_gpio {
25 struct gpio_chip chip;
26 struct regmap *map;
27 };
28
lp87565_gpio_get(struct gpio_chip * chip,unsigned int offset)29 static 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
lp87565_gpio_set(struct gpio_chip * chip,unsigned int offset,int value)41 static 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
lp87565_gpio_get_direction(struct gpio_chip * chip,unsigned int offset)50 static 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 if (val & BIT(offset))
61 return GPIO_LINE_DIRECTION_OUT;
62
63 return GPIO_LINE_DIRECTION_IN;
64 }
65
lp87565_gpio_direction_input(struct gpio_chip * chip,unsigned int offset)66 static int lp87565_gpio_direction_input(struct gpio_chip *chip,
67 unsigned int offset)
68 {
69 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
70
71 return regmap_update_bits(gpio->map,
72 LP87565_REG_GPIO_CONFIG,
73 BIT(offset), 0);
74 }
75
lp87565_gpio_direction_output(struct gpio_chip * chip,unsigned int offset,int value)76 static int lp87565_gpio_direction_output(struct gpio_chip *chip,
77 unsigned int offset, int value)
78 {
79 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
80
81 lp87565_gpio_set(chip, offset, value);
82
83 return regmap_update_bits(gpio->map,
84 LP87565_REG_GPIO_CONFIG,
85 BIT(offset), BIT(offset));
86 }
87
lp87565_gpio_request(struct gpio_chip * gc,unsigned int offset)88 static int lp87565_gpio_request(struct gpio_chip *gc, unsigned int offset)
89 {
90 struct lp87565_gpio *gpio = gpiochip_get_data(gc);
91 int ret;
92
93 switch (offset) {
94 case 0:
95 case 1:
96 case 2:
97 /*
98 * MUX can program the pin to be in EN1/2/3 pin mode
99 * Or GPIO1/2/3 mode.
100 * Setup the GPIO*_SEL MUX to GPIO mode
101 */
102 ret = regmap_update_bits(gpio->map,
103 LP87565_REG_PIN_FUNCTION,
104 BIT(offset), BIT(offset));
105 if (ret)
106 return ret;
107
108 break;
109 default:
110 return -EINVAL;
111 }
112
113 return 0;
114 }
115
lp87565_gpio_set_config(struct gpio_chip * gc,unsigned int offset,unsigned long config)116 static int lp87565_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
117 unsigned long config)
118 {
119 struct lp87565_gpio *gpio = gpiochip_get_data(gc);
120
121 switch (pinconf_to_config_param(config)) {
122 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
123 return regmap_update_bits(gpio->map,
124 LP87565_REG_GPIO_CONFIG,
125 BIT(offset +
126 __ffs(LP87565_GOIO1_OD)),
127 BIT(offset +
128 __ffs(LP87565_GOIO1_OD)));
129 case PIN_CONFIG_DRIVE_PUSH_PULL:
130 return regmap_update_bits(gpio->map,
131 LP87565_REG_GPIO_CONFIG,
132 BIT(offset +
133 __ffs(LP87565_GOIO1_OD)), 0);
134 default:
135 return -ENOTSUPP;
136 }
137 }
138
139 static const struct gpio_chip template_chip = {
140 .label = "lp87565-gpio",
141 .owner = THIS_MODULE,
142 .request = lp87565_gpio_request,
143 .get_direction = lp87565_gpio_get_direction,
144 .direction_input = lp87565_gpio_direction_input,
145 .direction_output = lp87565_gpio_direction_output,
146 .get = lp87565_gpio_get,
147 .set = lp87565_gpio_set,
148 .set_config = lp87565_gpio_set_config,
149 .base = -1,
150 .ngpio = 3,
151 .can_sleep = true,
152 };
153
lp87565_gpio_probe(struct platform_device * pdev)154 static int lp87565_gpio_probe(struct platform_device *pdev)
155 {
156 struct lp87565_gpio *gpio;
157 struct lp87565 *lp87565;
158 int ret;
159
160 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
161 if (!gpio)
162 return -ENOMEM;
163
164 lp87565 = dev_get_drvdata(pdev->dev.parent);
165 gpio->chip = template_chip;
166 gpio->chip.parent = lp87565->dev;
167 gpio->map = lp87565->regmap;
168
169 ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
170 if (ret < 0) {
171 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
172 return ret;
173 }
174
175 return 0;
176 }
177
178 static const struct platform_device_id lp87565_gpio_id_table[] = {
179 { "lp87565-q1-gpio", },
180 { /* sentinel */ }
181 };
182 MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table);
183
184 static struct platform_driver lp87565_gpio_driver = {
185 .driver = {
186 .name = "lp87565-gpio",
187 },
188 .probe = lp87565_gpio_probe,
189 .id_table = lp87565_gpio_id_table,
190 };
191 module_platform_driver(lp87565_gpio_driver);
192
193 MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
194 MODULE_DESCRIPTION("LP87565 GPIO driver");
195 MODULE_LICENSE("GPL v2");
196
