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
28 struct da9055_gpio {
29 struct da9055 *da9055;
30 struct gpio_chip gp;
31 };
32
da9055_gpio_get(struct gpio_chip * gc,unsigned offset)33 static 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
da9055_gpio_set(struct gpio_chip * gc,unsigned offset,int value)62 static 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
da9055_gpio_direction_input(struct gpio_chip * gc,unsigned offset)72 static 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
da9055_gpio_direction_output(struct gpio_chip * gc,unsigned offset,int value)87 static 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
da9055_gpio_to_irq(struct gpio_chip * gc,u32 offset)110 static 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
119 static 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
da9055_gpio_probe(struct platform_device * pdev)132 static int da9055_gpio_probe(struct platform_device *pdev)
133 {
134 struct da9055_gpio *gpio;
135 struct da9055_pdata *pdata;
136
137 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
138 if (!gpio)
139 return -ENOMEM;
140
141 gpio->da9055 = dev_get_drvdata(pdev->dev.parent);
142 pdata = dev_get_platdata(gpio->da9055->dev);
143
144 gpio->gp = reference_gp;
145 if (pdata && pdata->gpio_base)
146 gpio->gp.base = pdata->gpio_base;
147
148 return devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
149 }
150
151 static struct platform_driver da9055_gpio_driver = {
152 .probe = da9055_gpio_probe,
153 .driver = {
154 .name = "da9055-gpio",
155 },
156 };
157
da9055_gpio_init(void)158 static int __init da9055_gpio_init(void)
159 {
160 return platform_driver_register(&da9055_gpio_driver);
161 }
162 subsys_initcall(da9055_gpio_init);
163
da9055_gpio_exit(void)164 static void __exit da9055_gpio_exit(void)
165 {
166 platform_driver_unregister(&da9055_gpio_driver);
167 }
168 module_exit(da9055_gpio_exit);
169
170 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
171 MODULE_DESCRIPTION("DA9055 GPIO Device Driver");
172 MODULE_LICENSE("GPL");
173 MODULE_ALIAS("platform:da9055-gpio");
174