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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
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
