Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 int da9055_gpio_set(struct gpio_chip *gc, unsigned int offset, int value)
63{
64 struct da9055_gpio *gpio = gpiochip_get_data(gc);
65
66 return da9055_reg_update(gpio->da9055, DA9055_REG_GPIO_MODE0_2,
67 1 << offset, value << offset);
68}
69
70static int da9055_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
71{
72 struct da9055_gpio *gpio = gpiochip_get_data(gc);
73 unsigned char reg_byte;
74
75 reg_byte = (DA9055_ACT_LOW | DA9055_GPI)
76 << DA9055_PORT_SHIFT(offset);
77
78 return da9055_reg_update(gpio->da9055, (offset >> 1) +
79 DA9055_REG_GPIO0_1,
80 DA9055_PORT_MASK <<
81 DA9055_PORT_SHIFT(offset),
82 reg_byte);
83}
84
85static int da9055_gpio_direction_output(struct gpio_chip *gc,
86 unsigned offset, int value)
87{
88 struct da9055_gpio *gpio = gpiochip_get_data(gc);
89 unsigned char reg_byte;
90 int ret;
91
92 reg_byte = (DA9055_VDD_IO | DA9055_PUSH_PULL)
93 << DA9055_PORT_SHIFT(offset);
94
95 ret = da9055_reg_update(gpio->da9055, (offset >> 1) +
96 DA9055_REG_GPIO0_1,
97 DA9055_PORT_MASK <<
98 DA9055_PORT_SHIFT(offset),
99 reg_byte);
100 if (ret < 0)
101 return ret;
102
103 return da9055_gpio_set(gc, offset, value);
104}
105
106static int da9055_gpio_to_irq(struct gpio_chip *gc, u32 offset)
107{
108 struct da9055_gpio *gpio = gpiochip_get_data(gc);
109 struct da9055 *da9055 = gpio->da9055;
110
111 return regmap_irq_get_virq(da9055->irq_data,
112 DA9055_IRQ_GPI0 + offset);
113}
114
115static const struct gpio_chip reference_gp = {
116 .label = "da9055-gpio",
117 .owner = THIS_MODULE,
118 .get = da9055_gpio_get,
119 .set = da9055_gpio_set,
120 .direction_input = da9055_gpio_direction_input,
121 .direction_output = da9055_gpio_direction_output,
122 .to_irq = da9055_gpio_to_irq,
123 .can_sleep = true,
124 .ngpio = 3,
125 .base = -1,
126};
127
128static int da9055_gpio_probe(struct platform_device *pdev)
129{
130 struct da9055_gpio *gpio;
131 struct da9055_pdata *pdata;
132
133 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
134 if (!gpio)
135 return -ENOMEM;
136
137 gpio->da9055 = dev_get_drvdata(pdev->dev.parent);
138 pdata = dev_get_platdata(gpio->da9055->dev);
139
140 gpio->gp = reference_gp;
141 if (pdata && pdata->gpio_base)
142 gpio->gp.base = pdata->gpio_base;
143
144 return devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
145}
146
147static struct platform_driver da9055_gpio_driver = {
148 .probe = da9055_gpio_probe,
149 .driver = {
150 .name = "da9055-gpio",
151 },
152};
153
154static int __init da9055_gpio_init(void)
155{
156 return platform_driver_register(&da9055_gpio_driver);
157}
158subsys_initcall(da9055_gpio_init);
159
160static void __exit da9055_gpio_exit(void)
161{
162 platform_driver_unregister(&da9055_gpio_driver);
163}
164module_exit(da9055_gpio_exit);
165
166MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
167MODULE_DESCRIPTION("DA9055 GPIO Device Driver");
168MODULE_LICENSE("GPL");
169MODULE_ALIAS("platform:da9055-gpio");