1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
4 *	Keerthy <j-keerthy@ti.com>
5 *
6 * Based on the LP873X driver
7 */
8
9#include <linux/gpio/driver.h>
10#include <linux/module.h>
11#include <linux/platform_device.h>
12#include <linux/regmap.h>
13
14#include <linux/mfd/lp87565.h>
15
16struct lp87565_gpio {
17	struct gpio_chip chip;
18	struct regmap *map;
19};
20
21static int lp87565_gpio_get(struct gpio_chip *chip, unsigned int offset)
22{
23	struct lp87565_gpio *gpio = gpiochip_get_data(chip);
24	int ret, val;
25
26	ret = regmap_read(gpio->map, LP87565_REG_GPIO_IN, &val);
27	if (ret < 0)
28		return ret;
29
30	return !!(val & BIT(offset));
31}
32
33static void lp87565_gpio_set(struct gpio_chip *chip, unsigned int offset,
34			     int value)
35{
36	struct lp87565_gpio *gpio = gpiochip_get_data(chip);
37
38	regmap_update_bits(gpio->map, LP87565_REG_GPIO_OUT,
39			   BIT(offset), value ? BIT(offset) : 0);
40}
41
42static int lp87565_gpio_get_direction(struct gpio_chip *chip,
43				      unsigned int offset)
44{
45	struct lp87565_gpio *gpio = gpiochip_get_data(chip);
46	int ret, val;
47
48	ret = regmap_read(gpio->map, LP87565_REG_GPIO_CONFIG, &val);
49	if (ret < 0)
50		return ret;
51
52	if (val & BIT(offset))
53		return GPIO_LINE_DIRECTION_OUT;
54
55	return GPIO_LINE_DIRECTION_IN;
56}
57
58static int lp87565_gpio_direction_input(struct gpio_chip *chip,
59					unsigned int offset)
60{
61	struct lp87565_gpio *gpio = gpiochip_get_data(chip);
62
63	return regmap_update_bits(gpio->map,
64				  LP87565_REG_GPIO_CONFIG,
65				  BIT(offset), 0);
66}
67
68static int lp87565_gpio_direction_output(struct gpio_chip *chip,
69					 unsigned int offset, int value)
70{
71	struct lp87565_gpio *gpio = gpiochip_get_data(chip);
72
73	lp87565_gpio_set(chip, offset, value);
74
75	return regmap_update_bits(gpio->map,
76				  LP87565_REG_GPIO_CONFIG,
77				  BIT(offset), BIT(offset));
78}
79
80static int lp87565_gpio_request(struct gpio_chip *gc, unsigned int offset)
81{
82	struct lp87565_gpio *gpio = gpiochip_get_data(gc);
83	int ret;
84
85	switch (offset) {
86	case 0:
87	case 1:
88	case 2:
89		/*
90		 * MUX can program the pin to be in EN1/2/3 pin mode
91		 * Or GPIO1/2/3 mode.
92		 * Setup the GPIO*_SEL MUX to GPIO mode
93		 */
94		ret = regmap_update_bits(gpio->map,
95					 LP87565_REG_PIN_FUNCTION,
96					 BIT(offset), BIT(offset));
97		if (ret)
98			return ret;
99
100		break;
101	default:
102		return -EINVAL;
103	}
104
105	return 0;
106}
107
108static int lp87565_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
109				   unsigned long config)
110{
111	struct lp87565_gpio *gpio = gpiochip_get_data(gc);
112
113	switch (pinconf_to_config_param(config)) {
114	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
115		return regmap_update_bits(gpio->map,
116					  LP87565_REG_GPIO_CONFIG,
117					  BIT(offset +
118					      __ffs(LP87565_GPIO1_OD)),
119					  BIT(offset +
120					      __ffs(LP87565_GPIO1_OD)));
121	case PIN_CONFIG_DRIVE_PUSH_PULL:
122		return regmap_update_bits(gpio->map,
123					  LP87565_REG_GPIO_CONFIG,
124					  BIT(offset +
125					      __ffs(LP87565_GPIO1_OD)), 0);
126	default:
127		return -ENOTSUPP;
128	}
129}
130
131static const struct gpio_chip template_chip = {
132	.label			= "lp87565-gpio",
133	.owner			= THIS_MODULE,
134	.request		= lp87565_gpio_request,
135	.get_direction		= lp87565_gpio_get_direction,
136	.direction_input	= lp87565_gpio_direction_input,
137	.direction_output	= lp87565_gpio_direction_output,
138	.get			= lp87565_gpio_get,
139	.set			= lp87565_gpio_set,
140	.set_config		= lp87565_gpio_set_config,
141	.base			= -1,
142	.ngpio			= 3,
143	.can_sleep		= true,
144};
145
146static int lp87565_gpio_probe(struct platform_device *pdev)
147{
148	struct lp87565_gpio *gpio;
149	struct lp87565 *lp87565;
150	int ret;
151
152	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
153	if (!gpio)
154		return -ENOMEM;
155
156	lp87565 = dev_get_drvdata(pdev->dev.parent);
157	gpio->chip = template_chip;
158	gpio->chip.parent = lp87565->dev;
159	gpio->map = lp87565->regmap;
160
161	ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
162	if (ret < 0) {
163		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
164		return ret;
165	}
166
167	return 0;
168}
169
170static const struct platform_device_id lp87565_gpio_id_table[] = {
171	{ "lp87565-q1-gpio", },
172	{ /* sentinel */ }
173};
174MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table);
175
176static struct platform_driver lp87565_gpio_driver = {
177	.driver = {
178		.name = "lp87565-gpio",
179	},
180	.probe = lp87565_gpio_probe,
181	.id_table = lp87565_gpio_id_table,
182};
183module_platform_driver(lp87565_gpio_driver);
184
185MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
186MODULE_DESCRIPTION("LP87565 GPIO driver");
187MODULE_LICENSE("GPL v2");
188