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14#include <linux/module.h>
15#include <linux/fs.h>
16#include <linux/uaccess.h>
17#include <linux/platform_device.h>
18#include <linux/gpio.h>
19#include <linux/syscalls.h>
20#include <linux/seq_file.h>
21
22#include <linux/mfd/da9052/da9052.h>
23#include <linux/mfd/da9052/reg.h>
24#include <linux/mfd/da9052/pdata.h>
25
26#define DA9052_INPUT 1
27#define DA9052_OUTPUT_OPENDRAIN 2
28#define DA9052_OUTPUT_PUSHPULL 3
29
30#define DA9052_SUPPLY_VDD_IO1 0
31
32#define DA9052_DEBOUNCING_OFF 0
33#define DA9052_DEBOUNCING_ON 1
34
35#define DA9052_OUTPUT_LOWLEVEL 0
36
37#define DA9052_ACTIVE_LOW 0
38#define DA9052_ACTIVE_HIGH 1
39
40#define DA9052_GPIO_MAX_PORTS_PER_REGISTER 8
41#define DA9052_GPIO_SHIFT_COUNT(no) (no%8)
42#define DA9052_GPIO_MASK_UPPER_NIBBLE 0xF0
43#define DA9052_GPIO_MASK_LOWER_NIBBLE 0x0F
44#define DA9052_GPIO_NIBBLE_SHIFT 4
45#define DA9052_IRQ_GPI0 16
46#define DA9052_GPIO_ODD_SHIFT 7
47#define DA9052_GPIO_EVEN_SHIFT 3
48
49struct da9052_gpio {
50 struct da9052 *da9052;
51 struct gpio_chip gp;
52};
53
54static inline struct da9052_gpio *to_da9052_gpio(struct gpio_chip *chip)
55{
56 return container_of(chip, struct da9052_gpio, gp);
57}
58
59static unsigned char da9052_gpio_port_odd(unsigned offset)
60{
61 return offset % 2;
62}
63
64static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset)
65{
66 struct da9052_gpio *gpio = to_da9052_gpio(gc);
67 int da9052_port_direction = 0;
68 int ret;
69
70 ret = da9052_reg_read(gpio->da9052,
71 DA9052_GPIO_0_1_REG + (offset >> 1));
72 if (ret < 0)
73 return ret;
74
75 if (da9052_gpio_port_odd(offset)) {
76 da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN;
77 da9052_port_direction >>= 4;
78 } else {
79 da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN;
80 }
81
82 switch (da9052_port_direction) {
83 case DA9052_INPUT:
84 if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER)
85 ret = da9052_reg_read(gpio->da9052,
86 DA9052_STATUS_C_REG);
87 else
88 ret = da9052_reg_read(gpio->da9052,
89 DA9052_STATUS_D_REG);
90 if (ret < 0)
91 return ret;
92 if (ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset)))
93 return 1;
94 else
95 return 0;
96 case DA9052_OUTPUT_PUSHPULL:
97 if (da9052_gpio_port_odd(offset))
98 return ret & DA9052_GPIO_ODD_PORT_MODE;
99 else
100 return ret & DA9052_GPIO_EVEN_PORT_MODE;
101 default:
102 return -EINVAL;
103 }
104}
105
106static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
107{
108 struct da9052_gpio *gpio = to_da9052_gpio(gc);
109 int ret;
110
111 if (da9052_gpio_port_odd(offset)) {
112 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
113 DA9052_GPIO_0_1_REG,
114 DA9052_GPIO_ODD_PORT_MODE,
115 value << DA9052_GPIO_ODD_SHIFT);
116 if (ret != 0)
117 dev_err(gpio->da9052->dev,
118 "Failed to updated gpio odd reg,%d",
119 ret);
120 } else {
121 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
122 DA9052_GPIO_0_1_REG,
123 DA9052_GPIO_EVEN_PORT_MODE,
124 value << DA9052_GPIO_EVEN_SHIFT);
125 if (ret != 0)
126 dev_err(gpio->da9052->dev,
127 "Failed to updated gpio even reg,%d",
128 ret);
129 }
130}
131
132static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
133{
134 struct da9052_gpio *gpio = to_da9052_gpio(gc);
135 unsigned char register_value;
136 int ret;
137
138
139 register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 |
140 DA9052_DEBOUNCING_ON << 3;
141
142 if (da9052_gpio_port_odd(offset))
143 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
144 DA9052_GPIO_0_1_REG,
145 DA9052_GPIO_MASK_UPPER_NIBBLE,
146 (register_value <<
147 DA9052_GPIO_NIBBLE_SHIFT));
148 else
149 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
150 DA9052_GPIO_0_1_REG,
151 DA9052_GPIO_MASK_LOWER_NIBBLE,
152 register_value);
153
154 return ret;
155}
156
157static int da9052_gpio_direction_output(struct gpio_chip *gc,
158 unsigned offset, int value)
159{
160 struct da9052_gpio *gpio = to_da9052_gpio(gc);
161 unsigned char register_value;
162 int ret;
163
164
165 register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 |
166 value << 3;
167
168 if (da9052_gpio_port_odd(offset))
169 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
170 DA9052_GPIO_0_1_REG,
171 DA9052_GPIO_MASK_UPPER_NIBBLE,
172 (register_value <<
173 DA9052_GPIO_NIBBLE_SHIFT));
174 else
175 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
176 DA9052_GPIO_0_1_REG,
177 DA9052_GPIO_MASK_LOWER_NIBBLE,
178 register_value);
179
180 return ret;
181}
182
183static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
184{
185 struct da9052_gpio *gpio = to_da9052_gpio(gc);
186 struct da9052 *da9052 = gpio->da9052;
187
188 int irq;
189
190 irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset);
191
192 return irq;
193}
194
195static struct gpio_chip reference_gp = {
196 .label = "da9052-gpio",
197 .owner = THIS_MODULE,
198 .get = da9052_gpio_get,
199 .set = da9052_gpio_set,
200 .direction_input = da9052_gpio_direction_input,
201 .direction_output = da9052_gpio_direction_output,
202 .to_irq = da9052_gpio_to_irq,
203 .can_sleep = 1,
204 .ngpio = 16,
205 .base = -1,
206};
207
208static int da9052_gpio_probe(struct platform_device *pdev)
209{
210 struct da9052_gpio *gpio;
211 struct da9052_pdata *pdata;
212 int ret;
213
214 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
215 if (gpio == NULL)
216 return -ENOMEM;
217
218 gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
219 pdata = gpio->da9052->dev->platform_data;
220
221 gpio->gp = reference_gp;
222 if (pdata && pdata->gpio_base)
223 gpio->gp.base = pdata->gpio_base;
224
225 ret = gpiochip_add(&gpio->gp);
226 if (ret < 0) {
227 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
228 return ret;
229 }
230
231 platform_set_drvdata(pdev, gpio);
232
233 return 0;
234}
235
236static int da9052_gpio_remove(struct platform_device *pdev)
237{
238 struct da9052_gpio *gpio = platform_get_drvdata(pdev);
239
240 return gpiochip_remove(&gpio->gp);
241}
242
243static struct platform_driver da9052_gpio_driver = {
244 .probe = da9052_gpio_probe,
245 .remove = da9052_gpio_remove,
246 .driver = {
247 .name = "da9052-gpio",
248 .owner = THIS_MODULE,
249 },
250};
251
252module_platform_driver(da9052_gpio_driver);
253
254MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
255MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
256MODULE_LICENSE("GPL");
257MODULE_ALIAS("platform:da9052-gpio");
258
