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5c7f2c76 K |
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 | ||
fa8f6d06 AL |
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 | ||
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 | ||
5c7f2c76 K |
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 | return !(val & BIT(offset)); | |
61 | } | |
62 | ||
63 | static 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 | ||
73 | static 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 | ||
fa8f6d06 AL |
78 | lp87565_gpio_set(chip, offset, value); |
79 | ||
5c7f2c76 K |
80 | return regmap_update_bits(gpio->map, |
81 | LP87565_REG_GPIO_CONFIG, | |
fa8f6d06 | 82 | BIT(offset), BIT(offset)); |
5c7f2c76 K |
83 | } |
84 | ||
85 | static 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 | ||
113 | static 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 | ||
136 | static 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 | ||
151 | static 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 | ||
175 | static const struct platform_device_id lp87565_gpio_id_table[] = { | |
176 | { "lp87565-q1-gpio", }, | |
177 | { /* sentinel */ } | |
178 | }; | |
179 | MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table); | |
180 | ||
181 | static 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 | }; | |
188 | module_platform_driver(lp87565_gpio_driver); | |
189 | ||
190 | MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>"); | |
191 | MODULE_DESCRIPTION("LP87565 GPIO driver"); | |
192 | MODULE_LICENSE("GPL v2"); |