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