1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * ROHM BD9571MWV-M and BD9574MWF-M GPIO driver
4  *
5  * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
6  *
7  * Based on the TPS65086 driver
8  *
9  * NOTE: Interrupts are not supported yet.
10  */
11 
12 #include <linux/gpio/driver.h>
13 #include <linux/mfd/rohm-generic.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 
17 #include <linux/mfd/bd9571mwv.h>
18 
19 struct bd9571mwv_gpio {
20 	struct regmap *regmap;
21 	struct gpio_chip chip;
22 };
23 
bd9571mwv_gpio_get_direction(struct gpio_chip * chip,unsigned int offset)24 static int bd9571mwv_gpio_get_direction(struct gpio_chip *chip,
25 				       unsigned int offset)
26 {
27 	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
28 	int ret, val;
29 
30 	ret = regmap_read(gpio->regmap, BD9571MWV_GPIO_DIR, &val);
31 	if (ret < 0)
32 		return ret;
33 	if (val & BIT(offset))
34 		return GPIO_LINE_DIRECTION_IN;
35 
36 	return GPIO_LINE_DIRECTION_OUT;
37 }
38 
bd9571mwv_gpio_direction_input(struct gpio_chip * chip,unsigned int offset)39 static int bd9571mwv_gpio_direction_input(struct gpio_chip *chip,
40 					 unsigned int offset)
41 {
42 	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
43 
44 	regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_DIR, BIT(offset), 0);
45 
46 	return 0;
47 }
48 
bd9571mwv_gpio_direction_output(struct gpio_chip * chip,unsigned int offset,int value)49 static int bd9571mwv_gpio_direction_output(struct gpio_chip *chip,
50 					  unsigned int offset, int value)
51 {
52 	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
53 
54 	/* Set the initial value */
55 	regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_OUT,
56 			   BIT(offset), value ? BIT(offset) : 0);
57 	regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_DIR,
58 			   BIT(offset), BIT(offset));
59 
60 	return 0;
61 }
62 
bd9571mwv_gpio_get(struct gpio_chip * chip,unsigned int offset)63 static int bd9571mwv_gpio_get(struct gpio_chip *chip, unsigned int offset)
64 {
65 	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
66 	int ret, val;
67 
68 	ret = regmap_read(gpio->regmap, BD9571MWV_GPIO_IN, &val);
69 	if (ret < 0)
70 		return ret;
71 
72 	return val & BIT(offset);
73 }
74 
bd9571mwv_gpio_set(struct gpio_chip * chip,unsigned int offset,int value)75 static void bd9571mwv_gpio_set(struct gpio_chip *chip, unsigned int offset,
76 			      int value)
77 {
78 	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
79 
80 	regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_OUT,
81 			   BIT(offset), value ? BIT(offset) : 0);
82 }
83 
84 static const struct gpio_chip template_chip = {
85 	.label			= "bd9571mwv-gpio",
86 	.owner			= THIS_MODULE,
87 	.get_direction		= bd9571mwv_gpio_get_direction,
88 	.direction_input	= bd9571mwv_gpio_direction_input,
89 	.direction_output	= bd9571mwv_gpio_direction_output,
90 	.get			= bd9571mwv_gpio_get,
91 	.set			= bd9571mwv_gpio_set,
92 	.base			= -1,
93 	.ngpio			= 2,
94 	.can_sleep		= true,
95 };
96 
bd9571mwv_gpio_probe(struct platform_device * pdev)97 static int bd9571mwv_gpio_probe(struct platform_device *pdev)
98 {
99 	struct bd9571mwv_gpio *gpio;
100 
101 	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
102 	if (!gpio)
103 		return -ENOMEM;
104 
105 	gpio->regmap = dev_get_regmap(pdev->dev.parent, NULL);
106 	gpio->chip = template_chip;
107 	gpio->chip.parent = pdev->dev.parent;
108 
109 	return devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
110 }
111 
112 static const struct platform_device_id bd9571mwv_gpio_id_table[] = {
113 	{ "bd9571mwv-gpio", ROHM_CHIP_TYPE_BD9571 },
114 	{ "bd9574mwf-gpio", ROHM_CHIP_TYPE_BD9574 },
115 	{ /* sentinel */ }
116 };
117 MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table);
118 
119 static struct platform_driver bd9571mwv_gpio_driver = {
120 	.driver = {
121 		.name = "bd9571mwv-gpio",
122 	},
123 	.probe = bd9571mwv_gpio_probe,
124 	.id_table = bd9571mwv_gpio_id_table,
125 };
126 module_platform_driver(bd9571mwv_gpio_driver);
127 
128 MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
129 MODULE_DESCRIPTION("BD9571MWV GPIO driver");
130 MODULE_LICENSE("GPL v2");
131