1/*
2 * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
3 *	Keerthy <j-keerthy@ti.com>
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
10 * kind, whether expressed or implied; without even the implied warranty
11 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 * GNU General Public License version 2 for more details.
13 *
14 * Based on the LP873X driver
15 */
16
17#include <linux/gpio/driver.h>
18#include <linux/module.h>
19#include <linux/platform_device.h>
20#include <linux/regmap.h>
21
22#include <linux/mfd/lp87565.h>
23
24struct lp87565_gpio {
25	struct gpio_chip chip;
26	struct regmap *map;
27};
28
29static int lp87565_gpio_get(struct gpio_chip *chip, unsigned int offset)
30{
31	struct lp87565_gpio *gpio = gpiochip_get_data(chip);
32	int ret, val;
33
34	ret = regmap_read(gpio->map, LP87565_REG_GPIO_IN, &val);
35	if (ret < 0)
36		return ret;
37
38	return !!(val & BIT(offset));
39}
40
41static void lp87565_gpio_set(struct gpio_chip *chip, unsigned int offset,
42			     int value)
43{
44	struct lp87565_gpio *gpio = gpiochip_get_data(chip);
45
46	regmap_update_bits(gpio->map, LP87565_REG_GPIO_OUT,
47			   BIT(offset), value ? BIT(offset) : 0);
48}
49
50static int lp87565_gpio_get_direction(struct gpio_chip *chip,
51				      unsigned int offset)
52{
53	struct lp87565_gpio *gpio = gpiochip_get_data(chip);
54	int ret, val;
55
56	ret = regmap_read(gpio->map, LP87565_REG_GPIO_CONFIG, &val);
57	if (ret < 0)
58		return ret;
59
60	if (val & BIT(offset))
61		return GPIO_LINE_DIRECTION_OUT;
62
63	return GPIO_LINE_DIRECTION_IN;
64}
65
66static int lp87565_gpio_direction_input(struct gpio_chip *chip,
67					unsigned int offset)
68{
69	struct lp87565_gpio *gpio = gpiochip_get_data(chip);
70
71	return regmap_update_bits(gpio->map,
72				  LP87565_REG_GPIO_CONFIG,
73				  BIT(offset), 0);
74}
75
76static int lp87565_gpio_direction_output(struct gpio_chip *chip,
77					 unsigned int offset, int value)
78{
79	struct lp87565_gpio *gpio = gpiochip_get_data(chip);
80
81	lp87565_gpio_set(chip, offset, value);
82
83	return regmap_update_bits(gpio->map,
84				  LP87565_REG_GPIO_CONFIG,
85				  BIT(offset), BIT(offset));
86}
87
88static int lp87565_gpio_request(struct gpio_chip *gc, unsigned int offset)
89{
90	struct lp87565_gpio *gpio = gpiochip_get_data(gc);
91	int ret;
92
93	switch (offset) {
94	case 0:
95	case 1:
96	case 2:
97		/*
98		 * MUX can program the pin to be in EN1/2/3 pin mode
99		 * Or GPIO1/2/3 mode.
100		 * Setup the GPIO*_SEL MUX to GPIO mode
101		 */
102		ret = regmap_update_bits(gpio->map,
103					 LP87565_REG_PIN_FUNCTION,
104					 BIT(offset), BIT(offset));
105		if (ret)
106			return ret;
107
108		break;
109	default:
110		return -EINVAL;
111	}
112
113	return 0;
114}
115
116static int lp87565_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
117				   unsigned long config)
118{
119	struct lp87565_gpio *gpio = gpiochip_get_data(gc);
120
121	switch (pinconf_to_config_param(config)) {
122	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
123		return regmap_update_bits(gpio->map,
124					  LP87565_REG_GPIO_CONFIG,
125					  BIT(offset +
126					      __ffs(LP87565_GOIO1_OD)),
127					  BIT(offset +
128					      __ffs(LP87565_GOIO1_OD)));
129	case PIN_CONFIG_DRIVE_PUSH_PULL:
130		return regmap_update_bits(gpio->map,
131					  LP87565_REG_GPIO_CONFIG,
132					  BIT(offset +
133					      __ffs(LP87565_GOIO1_OD)), 0);
134	default:
135		return -ENOTSUPP;
136	}
137}
138
139static const struct gpio_chip template_chip = {
140	.label			= "lp87565-gpio",
141	.owner			= THIS_MODULE,
142	.request		= lp87565_gpio_request,
143	.get_direction		= lp87565_gpio_get_direction,
144	.direction_input	= lp87565_gpio_direction_input,
145	.direction_output	= lp87565_gpio_direction_output,
146	.get			= lp87565_gpio_get,
147	.set			= lp87565_gpio_set,
148	.set_config		= lp87565_gpio_set_config,
149	.base			= -1,
150	.ngpio			= 3,
151	.can_sleep		= true,
152};
153
154static int lp87565_gpio_probe(struct platform_device *pdev)
155{
156	struct lp87565_gpio *gpio;
157	struct lp87565 *lp87565;
158	int ret;
159
160	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
161	if (!gpio)
162		return -ENOMEM;
163
164	lp87565 = dev_get_drvdata(pdev->dev.parent);
165	gpio->chip = template_chip;
166	gpio->chip.parent = lp87565->dev;
167	gpio->map = lp87565->regmap;
168
169	ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
170	if (ret < 0) {
171		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
172		return ret;
173	}
174
175	return 0;
176}
177
178static const struct platform_device_id lp87565_gpio_id_table[] = {
179	{ "lp87565-q1-gpio", },
180	{ /* sentinel */ }
181};
182MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table);
183
184static struct platform_driver lp87565_gpio_driver = {
185	.driver = {
186		.name = "lp87565-gpio",
187	},
188	.probe = lp87565_gpio_probe,
189	.id_table = lp87565_gpio_id_table,
190};
191module_platform_driver(lp87565_gpio_driver);
192
193MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
194MODULE_DESCRIPTION("LP87565 GPIO driver");
195MODULE_LICENSE("GPL v2");
196