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14#include <linux/module.h>
15#include <linux/platform_device.h>
16#include <linux/gpio.h>
17
18#include <linux/mfd/da9055/core.h>
19#include <linux/mfd/da9055/reg.h>
20#include <linux/mfd/da9055/pdata.h>
21
22#define DA9055_VDD_IO 0x0
23#define DA9055_PUSH_PULL 0x3
24#define DA9055_ACT_LOW 0x0
25#define DA9055_GPI 0x1
26#define DA9055_PORT_MASK 0x3
27#define DA9055_PORT_SHIFT(offset) (4 * (offset % 2))
28
29#define DA9055_INPUT DA9055_GPI
30#define DA9055_OUTPUT DA9055_PUSH_PULL
31#define DA9055_IRQ_GPI0 3
32
33struct da9055_gpio {
34 struct da9055 *da9055;
35 struct gpio_chip gp;
36};
37
38static inline struct da9055_gpio *to_da9055_gpio(struct gpio_chip *chip)
39{
40 return container_of(chip, struct da9055_gpio, gp);
41}
42
43static int da9055_gpio_get(struct gpio_chip *gc, unsigned offset)
44{
45 struct da9055_gpio *gpio = to_da9055_gpio(gc);
46 int gpio_direction = 0;
47 int ret;
48
49
50 ret = da9055_reg_read(gpio->da9055, (offset >> 1) + DA9055_REG_GPIO0_1);
51 if (ret < 0)
52 return ret;
53
54 gpio_direction = ret & (DA9055_PORT_MASK) << DA9055_PORT_SHIFT(offset);
55 gpio_direction >>= DA9055_PORT_SHIFT(offset);
56 switch (gpio_direction) {
57 case DA9055_INPUT:
58 ret = da9055_reg_read(gpio->da9055, DA9055_REG_STATUS_B);
59 if (ret < 0)
60 return ret;
61 break;
62 case DA9055_OUTPUT:
63 ret = da9055_reg_read(gpio->da9055, DA9055_REG_GPIO_MODE0_2);
64 if (ret < 0)
65 return ret;
66 }
67
68 return ret & (1 << offset);
69
70}
71
72static void da9055_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
73{
74 struct da9055_gpio *gpio = to_da9055_gpio(gc);
75
76 da9055_reg_update(gpio->da9055,
77 DA9055_REG_GPIO_MODE0_2,
78 1 << offset,
79 value << offset);
80}
81
82static int da9055_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
83{
84 struct da9055_gpio *gpio = to_da9055_gpio(gc);
85 unsigned char reg_byte;
86
87 reg_byte = (DA9055_ACT_LOW | DA9055_GPI)
88 << DA9055_PORT_SHIFT(offset);
89
90 return da9055_reg_update(gpio->da9055, (offset >> 1) +
91 DA9055_REG_GPIO0_1,
92 DA9055_PORT_MASK <<
93 DA9055_PORT_SHIFT(offset),
94 reg_byte);
95}
96
97static int da9055_gpio_direction_output(struct gpio_chip *gc,
98 unsigned offset, int value)
99{
100 struct da9055_gpio *gpio = to_da9055_gpio(gc);
101 unsigned char reg_byte;
102 int ret;
103
104 reg_byte = (DA9055_VDD_IO | DA9055_PUSH_PULL)
105 << DA9055_PORT_SHIFT(offset);
106
107 ret = da9055_reg_update(gpio->da9055, (offset >> 1) +
108 DA9055_REG_GPIO0_1,
109 DA9055_PORT_MASK <<
110 DA9055_PORT_SHIFT(offset),
111 reg_byte);
112 if (ret < 0)
113 return ret;
114
115 da9055_gpio_set(gc, offset, value);
116
117 return 0;
118}
119
120static int da9055_gpio_to_irq(struct gpio_chip *gc, u32 offset)
121{
122 struct da9055_gpio *gpio = to_da9055_gpio(gc);
123 struct da9055 *da9055 = gpio->da9055;
124
125 return regmap_irq_get_virq(da9055->irq_data,
126 DA9055_IRQ_GPI0 + offset);
127}
128
129static struct gpio_chip reference_gp = {
130 .label = "da9055-gpio",
131 .owner = THIS_MODULE,
132 .get = da9055_gpio_get,
133 .set = da9055_gpio_set,
134 .direction_input = da9055_gpio_direction_input,
135 .direction_output = da9055_gpio_direction_output,
136 .to_irq = da9055_gpio_to_irq,
137 .can_sleep = true,
138 .ngpio = 3,
139 .base = -1,
140};
141
142static int da9055_gpio_probe(struct platform_device *pdev)
143{
144 struct da9055_gpio *gpio;
145 struct da9055_pdata *pdata;
146 int ret;
147
148 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
149 if (!gpio)
150 return -ENOMEM;
151
152 gpio->da9055 = dev_get_drvdata(pdev->dev.parent);
153 pdata = dev_get_platdata(gpio->da9055->dev);
154
155 gpio->gp = reference_gp;
156 if (pdata && pdata->gpio_base)
157 gpio->gp.base = pdata->gpio_base;
158
159 ret = gpiochip_add(&gpio->gp);
160 if (ret < 0) {
161 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
162 goto err_mem;
163 }
164
165 platform_set_drvdata(pdev, gpio);
166
167 return 0;
168
169err_mem:
170 return ret;
171}
172
173static int da9055_gpio_remove(struct platform_device *pdev)
174{
175 struct da9055_gpio *gpio = platform_get_drvdata(pdev);
176
177 gpiochip_remove(&gpio->gp);
178 return 0;
179}
180
181static struct platform_driver da9055_gpio_driver = {
182 .probe = da9055_gpio_probe,
183 .remove = da9055_gpio_remove,
184 .driver = {
185 .name = "da9055-gpio",
186 },
187};
188
189static int __init da9055_gpio_init(void)
190{
191 return platform_driver_register(&da9055_gpio_driver);
192}
193subsys_initcall(da9055_gpio_init);
194
195static void __exit da9055_gpio_exit(void)
196{
197 platform_driver_unregister(&da9055_gpio_driver);
198}
199module_exit(da9055_gpio_exit);
200
201MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
202MODULE_DESCRIPTION("DA9055 GPIO Device Driver");
203MODULE_LICENSE("GPL");
204MODULE_ALIAS("platform:da9055-gpio");
205
