1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * GPIO Driver for Dialog DA9055 PMICs.
4 *
5 * Copyright(c) 2012 Dialog Semiconductor Ltd.
6 *
7 * Author: David Dajun Chen <dchen@diasemi.com>
8 */
9#include <linux/module.h>
10#include <linux/platform_device.h>
11#include <linux/gpio/driver.h>
12
13#include <linux/mfd/da9055/core.h>
14#include <linux/mfd/da9055/reg.h>
15#include <linux/mfd/da9055/pdata.h>
16
17#define DA9055_VDD_IO			0x0
18#define DA9055_PUSH_PULL		0x3
19#define DA9055_ACT_LOW			0x0
20#define DA9055_GPI			0x1
21#define DA9055_PORT_MASK		0x3
22#define DA9055_PORT_SHIFT(offset)	(4 * (offset % 2))
23
24#define DA9055_INPUT			DA9055_GPI
25#define DA9055_OUTPUT			DA9055_PUSH_PULL
26#define DA9055_IRQ_GPI0			3
27
28struct da9055_gpio {
29	struct da9055 *da9055;
30	struct gpio_chip gp;
31};
32
33static int da9055_gpio_get(struct gpio_chip *gc, unsigned offset)
34{
35	struct da9055_gpio *gpio = gpiochip_get_data(gc);
36	int gpio_direction = 0;
37	int ret;
38
39	/* Get GPIO direction */
40	ret = da9055_reg_read(gpio->da9055, (offset >> 1) + DA9055_REG_GPIO0_1);
41	if (ret < 0)
42		return ret;
43
44	gpio_direction = ret & (DA9055_PORT_MASK) << DA9055_PORT_SHIFT(offset);
45	gpio_direction >>= DA9055_PORT_SHIFT(offset);
46	switch (gpio_direction) {
47	case DA9055_INPUT:
48		ret = da9055_reg_read(gpio->da9055, DA9055_REG_STATUS_B);
49		if (ret < 0)
50			return ret;
51		break;
52	case DA9055_OUTPUT:
53		ret = da9055_reg_read(gpio->da9055, DA9055_REG_GPIO_MODE0_2);
54		if (ret < 0)
55			return ret;
56	}
57
58	return ret & (1 << offset);
59
60}
61
62static void da9055_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
63{
64	struct da9055_gpio *gpio = gpiochip_get_data(gc);
65
66	da9055_reg_update(gpio->da9055,
67			DA9055_REG_GPIO_MODE0_2,
68			1 << offset,
69			value << offset);
70}
71
72static int da9055_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
73{
74	struct da9055_gpio *gpio = gpiochip_get_data(gc);
75	unsigned char reg_byte;
76
77	reg_byte = (DA9055_ACT_LOW | DA9055_GPI)
78				<< DA9055_PORT_SHIFT(offset);
79
80	return da9055_reg_update(gpio->da9055, (offset >> 1) +
81				DA9055_REG_GPIO0_1,
82				DA9055_PORT_MASK <<
83				DA9055_PORT_SHIFT(offset),
84				reg_byte);
85}
86
87static int da9055_gpio_direction_output(struct gpio_chip *gc,
88					unsigned offset, int value)
89{
90	struct da9055_gpio *gpio = gpiochip_get_data(gc);
91	unsigned char reg_byte;
92	int ret;
93
94	reg_byte = (DA9055_VDD_IO | DA9055_PUSH_PULL)
95					<< DA9055_PORT_SHIFT(offset);
96
97	ret = da9055_reg_update(gpio->da9055, (offset >> 1) +
98				DA9055_REG_GPIO0_1,
99				DA9055_PORT_MASK <<
100				DA9055_PORT_SHIFT(offset),
101				reg_byte);
102	if (ret < 0)
103		return ret;
104
105	da9055_gpio_set(gc, offset, value);
106
107	return 0;
108}
109
110static int da9055_gpio_to_irq(struct gpio_chip *gc, u32 offset)
111{
112	struct da9055_gpio *gpio = gpiochip_get_data(gc);
113	struct da9055 *da9055 = gpio->da9055;
114
115	return regmap_irq_get_virq(da9055->irq_data,
116				  DA9055_IRQ_GPI0 + offset);
117}
118
119static const struct gpio_chip reference_gp = {
120	.label = "da9055-gpio",
121	.owner = THIS_MODULE,
122	.get = da9055_gpio_get,
123	.set = da9055_gpio_set,
124	.direction_input = da9055_gpio_direction_input,
125	.direction_output = da9055_gpio_direction_output,
126	.to_irq = da9055_gpio_to_irq,
127	.can_sleep = true,
128	.ngpio = 3,
129	.base = -1,
130};
131
132static int da9055_gpio_probe(struct platform_device *pdev)
133{
134	struct da9055_gpio *gpio;
135	struct da9055_pdata *pdata;
136	int ret;
137
138	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
139	if (!gpio)
140		return -ENOMEM;
141
142	gpio->da9055 = dev_get_drvdata(pdev->dev.parent);
143	pdata = dev_get_platdata(gpio->da9055->dev);
144
145	gpio->gp = reference_gp;
146	if (pdata && pdata->gpio_base)
147		gpio->gp.base = pdata->gpio_base;
148
149	ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
150	if (ret < 0) {
151		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
152		return ret;
153	}
154
155	platform_set_drvdata(pdev, gpio);
156
157	return 0;
158}
159
160static struct platform_driver da9055_gpio_driver = {
161	.probe = da9055_gpio_probe,
162	.driver = {
163		.name	= "da9055-gpio",
164	},
165};
166
167static int __init da9055_gpio_init(void)
168{
169	return platform_driver_register(&da9055_gpio_driver);
170}
171subsys_initcall(da9055_gpio_init);
172
173static void __exit da9055_gpio_exit(void)
174{
175	platform_driver_unregister(&da9055_gpio_driver);
176}
177module_exit(da9055_gpio_exit);
178
179MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
180MODULE_DESCRIPTION("DA9055 GPIO Device Driver");
181MODULE_LICENSE("GPL");
182MODULE_ALIAS("platform:da9055-gpio");
183