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
tps65912_gpio_get_direction(struct gpio_chip * gc,unsigned offset)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
tps65912_gpio_direction_input(struct gpio_chip * gc,unsigned offset)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
tps65912_gpio_direction_output(struct gpio_chip * gc,unsigned offset,int value)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
tps65912_gpio_get(struct gpio_chip * gc,unsigned offset)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
tps65912_gpio_set(struct gpio_chip * gc,unsigned offset,int value)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
tps65912_gpio_probe(struct platform_device * pdev)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");
132