1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * GPIO Driver for Dialog DA9052 PMICs.
4 *
5 * Copyright(c) 2011 Dialog Semiconductor Ltd.
6 *
7 * Author: David Dajun Chen <dchen@diasemi.com>
8 */
9#include <linux/fs.h>
10#include <linux/gpio/driver.h>
11#include <linux/module.h>
12#include <linux/platform_device.h>
13#include <linux/syscalls.h>
14#include <linux/uaccess.h>
15
16#include <linux/mfd/da9052/da9052.h>
17#include <linux/mfd/da9052/pdata.h>
18#include <linux/mfd/da9052/reg.h>
19
20#define DA9052_INPUT				1
21#define DA9052_OUTPUT_OPENDRAIN		2
22#define DA9052_OUTPUT_PUSHPULL			3
23
24#define DA9052_SUPPLY_VDD_IO1			0
25
26#define DA9052_DEBOUNCING_OFF			0
27#define DA9052_DEBOUNCING_ON			1
28
29#define DA9052_OUTPUT_LOWLEVEL			0
30
31#define DA9052_ACTIVE_LOW			0
32#define DA9052_ACTIVE_HIGH			1
33
34#define DA9052_GPIO_MAX_PORTS_PER_REGISTER	8
35#define DA9052_GPIO_SHIFT_COUNT(no)		(no%8)
36#define DA9052_GPIO_MASK_UPPER_NIBBLE		0xF0
37#define DA9052_GPIO_MASK_LOWER_NIBBLE		0x0F
38#define DA9052_GPIO_NIBBLE_SHIFT		4
39#define DA9052_IRQ_GPI0			16
40#define DA9052_GPIO_ODD_SHIFT			7
41#define DA9052_GPIO_EVEN_SHIFT			3
42
43struct da9052_gpio {
44	struct da9052 *da9052;
45	struct gpio_chip gp;
46};
47
48static unsigned char da9052_gpio_port_odd(unsigned offset)
49{
50	return offset % 2;
51}
52
53static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset)
54{
55	struct da9052_gpio *gpio = gpiochip_get_data(gc);
56	int da9052_port_direction = 0;
57	int ret;
58
59	ret = da9052_reg_read(gpio->da9052,
60			      DA9052_GPIO_0_1_REG + (offset >> 1));
61	if (ret < 0)
62		return ret;
63
64	if (da9052_gpio_port_odd(offset)) {
65		da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN;
66		da9052_port_direction >>= 4;
67	} else {
68		da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN;
69	}
70
71	switch (da9052_port_direction) {
72	case DA9052_INPUT:
73		if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER)
74			ret = da9052_reg_read(gpio->da9052,
75					      DA9052_STATUS_C_REG);
76		else
77			ret = da9052_reg_read(gpio->da9052,
78					      DA9052_STATUS_D_REG);
79		if (ret < 0)
80			return ret;
81		return !!(ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset)));
82	case DA9052_OUTPUT_PUSHPULL:
83		if (da9052_gpio_port_odd(offset))
84			return !!(ret & DA9052_GPIO_ODD_PORT_MODE);
85		else
86			return !!(ret & DA9052_GPIO_EVEN_PORT_MODE);
87	default:
88		return -EINVAL;
89	}
90}
91
92static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
93{
94	struct da9052_gpio *gpio = gpiochip_get_data(gc);
95	int ret;
96
97	if (da9052_gpio_port_odd(offset)) {
98			ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
99						DA9052_GPIO_0_1_REG,
100						DA9052_GPIO_ODD_PORT_MODE,
101						value << DA9052_GPIO_ODD_SHIFT);
102			if (ret != 0)
103				dev_err(gpio->da9052->dev,
104					"Failed to updated gpio odd reg,%d",
105					ret);
106	} else {
107			ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
108						DA9052_GPIO_0_1_REG,
109						DA9052_GPIO_EVEN_PORT_MODE,
110						value << DA9052_GPIO_EVEN_SHIFT);
111			if (ret != 0)
112				dev_err(gpio->da9052->dev,
113					"Failed to updated gpio even reg,%d",
114					ret);
115	}
116}
117
118static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
119{
120	struct da9052_gpio *gpio = gpiochip_get_data(gc);
121	unsigned char register_value;
122	int ret;
123
124	/* Format: function - 2 bits type - 1 bit mode - 1 bit */
125	register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 |
126			 DA9052_DEBOUNCING_ON << 3;
127
128	if (da9052_gpio_port_odd(offset))
129		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
130					DA9052_GPIO_0_1_REG,
131					DA9052_GPIO_MASK_UPPER_NIBBLE,
132					(register_value <<
133					DA9052_GPIO_NIBBLE_SHIFT));
134	else
135		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
136					DA9052_GPIO_0_1_REG,
137					DA9052_GPIO_MASK_LOWER_NIBBLE,
138					register_value);
139
140	return ret;
141}
142
143static int da9052_gpio_direction_output(struct gpio_chip *gc,
144					unsigned offset, int value)
145{
146	struct da9052_gpio *gpio = gpiochip_get_data(gc);
147	unsigned char register_value;
148	int ret;
149
150	/* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */
151	register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 |
152			 value << 3;
153
154	if (da9052_gpio_port_odd(offset))
155		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
156					DA9052_GPIO_0_1_REG,
157					DA9052_GPIO_MASK_UPPER_NIBBLE,
158					(register_value <<
159					DA9052_GPIO_NIBBLE_SHIFT));
160	else
161		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
162					DA9052_GPIO_0_1_REG,
163					DA9052_GPIO_MASK_LOWER_NIBBLE,
164					register_value);
165
166	return ret;
167}
168
169static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
170{
171	struct da9052_gpio *gpio = gpiochip_get_data(gc);
172	struct da9052 *da9052 = gpio->da9052;
173
174	int irq;
175
176	irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset);
177
178	return irq;
179}
180
181static const struct gpio_chip reference_gp = {
182	.label = "da9052-gpio",
183	.owner = THIS_MODULE,
184	.get = da9052_gpio_get,
185	.set = da9052_gpio_set,
186	.direction_input = da9052_gpio_direction_input,
187	.direction_output = da9052_gpio_direction_output,
188	.to_irq = da9052_gpio_to_irq,
189	.can_sleep = true,
190	.ngpio = 16,
191	.base = -1,
192};
193
194static int da9052_gpio_probe(struct platform_device *pdev)
195{
196	struct da9052_gpio *gpio;
197	struct da9052_pdata *pdata;
198
199	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
200	if (!gpio)
201		return -ENOMEM;
202
203	gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
204	pdata = dev_get_platdata(gpio->da9052->dev);
205
206	gpio->gp = reference_gp;
207	if (pdata && pdata->gpio_base)
208		gpio->gp.base = pdata->gpio_base;
209
210	return devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
211}
212
213static struct platform_driver da9052_gpio_driver = {
214	.probe = da9052_gpio_probe,
215	.driver = {
216		.name	= "da9052-gpio",
217	},
218};
219
220module_platform_driver(da9052_gpio_driver);
221
222MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
223MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
224MODULE_LICENSE("GPL");
225MODULE_ALIAS("platform:da9052-gpio");
226