Commit | Line | Data |
---|---|---|
07bfc915 | 1 | /* |
2 | * GPIO Driver for Dialog DA9052 PMICs. | |
3 | * | |
4 | * Copyright(c) 2011 Dialog Semiconductor Ltd. | |
5 | * | |
6 | * Author: David Dajun Chen <dchen@diasemi.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2 of the License, or (at your | |
11 | * option) any later version. | |
12 | * | |
13 | */ | |
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> | |
07bfc915 | 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 | |
87b9b0e0 AJ |
45 | #define DA9052_IRQ_GPI0 16 |
46 | #define DA9052_GPIO_ODD_SHIFT 7 | |
47 | #define DA9052_GPIO_EVEN_SHIFT 3 | |
07bfc915 | 48 | |
49 | struct da9052_gpio { | |
50 | struct da9052 *da9052; | |
51 | struct gpio_chip gp; | |
52 | }; | |
53 | ||
54 | static inline struct da9052_gpio *to_da9052_gpio(struct gpio_chip *chip) | |
55 | { | |
56 | return container_of(chip, struct da9052_gpio, gp); | |
57 | } | |
58 | ||
59 | static unsigned char da9052_gpio_port_odd(unsigned offset) | |
60 | { | |
61 | return offset % 2; | |
62 | } | |
63 | ||
64 | static 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 | ||
106 | static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value) | |
107 | { | |
108 | struct da9052_gpio *gpio = to_da9052_gpio(gc); | |
07bfc915 | 109 | int ret; |
110 | ||
111 | if (da9052_gpio_port_odd(offset)) { | |
07bfc915 | 112 | ret = da9052_reg_update(gpio->da9052, (offset >> 1) + |
113 | DA9052_GPIO_0_1_REG, | |
114 | DA9052_GPIO_ODD_PORT_MODE, | |
87b9b0e0 | 115 | value << DA9052_GPIO_ODD_SHIFT); |
07bfc915 | 116 | if (ret != 0) |
117 | dev_err(gpio->da9052->dev, | |
118 | "Failed to updated gpio odd reg,%d", | |
119 | ret); | |
07bfc915 | 120 | } else { |
07bfc915 | 121 | ret = da9052_reg_update(gpio->da9052, (offset >> 1) + |
122 | DA9052_GPIO_0_1_REG, | |
123 | DA9052_GPIO_EVEN_PORT_MODE, | |
87b9b0e0 | 124 | value << DA9052_GPIO_EVEN_SHIFT); |
07bfc915 | 125 | if (ret != 0) |
126 | dev_err(gpio->da9052->dev, | |
127 | "Failed to updated gpio even reg,%d", | |
128 | ret); | |
07bfc915 | 129 | } |
130 | } | |
131 | ||
132 | static 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 | /* Format: function - 2 bits type - 1 bit mode - 1 bit */ | |
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 | ||
157 | static 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 | /* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */ | |
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 | ||
183 | static 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 | return da9052->irq_base + DA9052_IRQ_GPI0 + offset; | |
189 | } | |
190 | ||
191 | static struct gpio_chip reference_gp __devinitdata = { | |
192 | .label = "da9052-gpio", | |
193 | .owner = THIS_MODULE, | |
194 | .get = da9052_gpio_get, | |
195 | .set = da9052_gpio_set, | |
196 | .direction_input = da9052_gpio_direction_input, | |
197 | .direction_output = da9052_gpio_direction_output, | |
198 | .to_irq = da9052_gpio_to_irq, | |
87b9b0e0 AJ |
199 | .can_sleep = 1, |
200 | .ngpio = 16, | |
201 | .base = -1, | |
07bfc915 | 202 | }; |
203 | ||
204 | static int __devinit da9052_gpio_probe(struct platform_device *pdev) | |
205 | { | |
206 | struct da9052_gpio *gpio; | |
207 | struct da9052_pdata *pdata; | |
208 | int ret; | |
209 | ||
eb7cf95a | 210 | gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); |
07bfc915 | 211 | if (gpio == NULL) |
212 | return -ENOMEM; | |
213 | ||
214 | gpio->da9052 = dev_get_drvdata(pdev->dev.parent); | |
215 | pdata = gpio->da9052->dev->platform_data; | |
216 | ||
07bfc915 | 217 | gpio->gp = reference_gp; |
218 | if (pdata && pdata->gpio_base) | |
219 | gpio->gp.base = pdata->gpio_base; | |
220 | ||
221 | ret = gpiochip_add(&gpio->gp); | |
222 | if (ret < 0) { | |
223 | dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); | |
eb7cf95a | 224 | return ret; |
07bfc915 | 225 | } |
226 | ||
227 | platform_set_drvdata(pdev, gpio); | |
228 | ||
229 | return 0; | |
07bfc915 | 230 | } |
231 | ||
232 | static int __devexit da9052_gpio_remove(struct platform_device *pdev) | |
233 | { | |
234 | struct da9052_gpio *gpio = platform_get_drvdata(pdev); | |
07bfc915 | 235 | |
eb7cf95a | 236 | return gpiochip_remove(&gpio->gp); |
07bfc915 | 237 | } |
238 | ||
239 | static struct platform_driver da9052_gpio_driver = { | |
240 | .probe = da9052_gpio_probe, | |
241 | .remove = __devexit_p(da9052_gpio_remove), | |
242 | .driver = { | |
243 | .name = "da9052-gpio", | |
244 | .owner = THIS_MODULE, | |
245 | }, | |
246 | }; | |
247 | ||
6f61415e | 248 | module_platform_driver(da9052_gpio_driver); |
07bfc915 | 249 | |
250 | MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); | |
251 | MODULE_DESCRIPTION("DA9052 GPIO Device Driver"); | |
252 | MODULE_LICENSE("GPL"); | |
253 | MODULE_ALIAS("platform:da9052-gpio"); |