GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / gpio / gpio-tps65912.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * GPIO driver for TI TPS65912x PMICs
4  *
5  * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
6  *      Andrew F. Davis <afd@ti.com>
7  *
8  * Based on the Arizona GPIO driver and the previous TPS65912 driver by
9  * Margarita Olaya Cabrera <magi@slimlogic.co.uk>
10  */
11
12 #include <linux/gpio/driver.h>
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15
16 #include <linux/mfd/tps65912.h>
17
18 struct tps65912_gpio {
19         struct gpio_chip gpio_chip;
20         struct tps65912 *tps;
21 };
22
23 static int tps65912_gpio_get_direction(struct gpio_chip *gc,
24                                        unsigned offset)
25 {
26         struct tps65912_gpio *gpio = gpiochip_get_data(gc);
27
28         int ret, val;
29
30         ret = regmap_read(gpio->tps->regmap, TPS65912_GPIO1 + offset, &val);
31         if (ret)
32                 return ret;
33
34         if (val & GPIO_CFG_MASK)
35                 return GPIO_LINE_DIRECTION_OUT;
36         else
37                 return GPIO_LINE_DIRECTION_IN;
38 }
39
40 static int tps65912_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
41 {
42         struct tps65912_gpio *gpio = gpiochip_get_data(gc);
43
44         return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
45                                   GPIO_CFG_MASK, 0);
46 }
47
48 static int tps65912_gpio_direction_output(struct gpio_chip *gc,
49                                           unsigned offset, int value)
50 {
51         struct tps65912_gpio *gpio = gpiochip_get_data(gc);
52
53         /* Set the initial value */
54         regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
55                            GPIO_SET_MASK, value ? GPIO_SET_MASK : 0);
56
57         return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
58                                   GPIO_CFG_MASK, GPIO_CFG_MASK);
59 }
60
61 static int tps65912_gpio_get(struct gpio_chip *gc, unsigned offset)
62 {
63         struct tps65912_gpio *gpio = gpiochip_get_data(gc);
64         int ret, val;
65
66         ret = regmap_read(gpio->tps->regmap, TPS65912_GPIO1 + offset, &val);
67         if (ret)
68                 return ret;
69
70         if (val & GPIO_STS_MASK)
71                 return 1;
72
73         return 0;
74 }
75
76 static void tps65912_gpio_set(struct gpio_chip *gc, unsigned offset,
77                               int value)
78 {
79         struct tps65912_gpio *gpio = gpiochip_get_data(gc);
80
81         regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
82                            GPIO_SET_MASK, value ? GPIO_SET_MASK : 0);
83 }
84
85 static const struct gpio_chip template_chip = {
86         .label                  = "tps65912-gpio",
87         .owner                  = THIS_MODULE,
88         .get_direction          = tps65912_gpio_get_direction,
89         .direction_input        = tps65912_gpio_direction_input,
90         .direction_output       = tps65912_gpio_direction_output,
91         .get                    = tps65912_gpio_get,
92         .set                    = tps65912_gpio_set,
93         .base                   = -1,
94         .ngpio                  = 5,
95         .can_sleep              = true,
96 };
97
98 static int tps65912_gpio_probe(struct platform_device *pdev)
99 {
100         struct tps65912 *tps = dev_get_drvdata(pdev->dev.parent);
101         struct tps65912_gpio *gpio;
102
103         gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
104         if (!gpio)
105                 return -ENOMEM;
106
107         gpio->tps = dev_get_drvdata(pdev->dev.parent);
108         gpio->gpio_chip = template_chip;
109         gpio->gpio_chip.parent = tps->dev;
110
111         return devm_gpiochip_add_data(&pdev->dev, &gpio->gpio_chip, gpio);
112 }
113
114 static const struct platform_device_id tps65912_gpio_id_table[] = {
115         { "tps65912-gpio", },
116         { /* sentinel */ }
117 };
118 MODULE_DEVICE_TABLE(platform, tps65912_gpio_id_table);
119
120 static struct platform_driver tps65912_gpio_driver = {
121         .driver = {
122                 .name = "tps65912-gpio",
123         },
124         .probe = tps65912_gpio_probe,
125         .id_table = tps65912_gpio_id_table,
126 };
127 module_platform_driver(tps65912_gpio_driver);
128
129 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
130 MODULE_DESCRIPTION("TPS65912 GPIO driver");
131 MODULE_LICENSE("GPL v2");