Commit | Line | Data |
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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 | ||
07bfc915 | 54 | static unsigned char da9052_gpio_port_odd(unsigned offset) |
55 | { | |
56 | return offset % 2; | |
57 | } | |
58 | ||
59 | static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset) | |
60 | { | |
0f6082d2 | 61 | struct da9052_gpio *gpio = gpiochip_get_data(gc); |
07bfc915 | 62 | int da9052_port_direction = 0; |
63 | int ret; | |
64 | ||
65 | ret = da9052_reg_read(gpio->da9052, | |
66 | DA9052_GPIO_0_1_REG + (offset >> 1)); | |
67 | if (ret < 0) | |
68 | return ret; | |
69 | ||
70 | if (da9052_gpio_port_odd(offset)) { | |
71 | da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN; | |
72 | da9052_port_direction >>= 4; | |
73 | } else { | |
74 | da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN; | |
75 | } | |
76 | ||
77 | switch (da9052_port_direction) { | |
78 | case DA9052_INPUT: | |
79 | if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER) | |
80 | ret = da9052_reg_read(gpio->da9052, | |
81 | DA9052_STATUS_C_REG); | |
82 | else | |
83 | ret = da9052_reg_read(gpio->da9052, | |
84 | DA9052_STATUS_D_REG); | |
85 | if (ret < 0) | |
86 | return ret; | |
1f66adfb | 87 | return !!(ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset))); |
07bfc915 | 88 | case DA9052_OUTPUT_PUSHPULL: |
89 | if (da9052_gpio_port_odd(offset)) | |
1f66adfb | 90 | return !!(ret & DA9052_GPIO_ODD_PORT_MODE); |
07bfc915 | 91 | else |
1f66adfb | 92 | return !!(ret & DA9052_GPIO_EVEN_PORT_MODE); |
07bfc915 | 93 | default: |
94 | return -EINVAL; | |
95 | } | |
96 | } | |
97 | ||
98 | static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value) | |
99 | { | |
0f6082d2 | 100 | struct da9052_gpio *gpio = gpiochip_get_data(gc); |
07bfc915 | 101 | int ret; |
102 | ||
103 | if (da9052_gpio_port_odd(offset)) { | |
07bfc915 | 104 | ret = da9052_reg_update(gpio->da9052, (offset >> 1) + |
105 | DA9052_GPIO_0_1_REG, | |
106 | DA9052_GPIO_ODD_PORT_MODE, | |
87b9b0e0 | 107 | value << DA9052_GPIO_ODD_SHIFT); |
07bfc915 | 108 | if (ret != 0) |
109 | dev_err(gpio->da9052->dev, | |
110 | "Failed to updated gpio odd reg,%d", | |
111 | ret); | |
07bfc915 | 112 | } else { |
07bfc915 | 113 | ret = da9052_reg_update(gpio->da9052, (offset >> 1) + |
114 | DA9052_GPIO_0_1_REG, | |
115 | DA9052_GPIO_EVEN_PORT_MODE, | |
87b9b0e0 | 116 | value << DA9052_GPIO_EVEN_SHIFT); |
07bfc915 | 117 | if (ret != 0) |
118 | dev_err(gpio->da9052->dev, | |
119 | "Failed to updated gpio even reg,%d", | |
120 | ret); | |
07bfc915 | 121 | } |
122 | } | |
123 | ||
124 | static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset) | |
125 | { | |
0f6082d2 | 126 | struct da9052_gpio *gpio = gpiochip_get_data(gc); |
07bfc915 | 127 | unsigned char register_value; |
128 | int ret; | |
129 | ||
130 | /* Format: function - 2 bits type - 1 bit mode - 1 bit */ | |
131 | register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 | | |
132 | DA9052_DEBOUNCING_ON << 3; | |
133 | ||
134 | if (da9052_gpio_port_odd(offset)) | |
135 | ret = da9052_reg_update(gpio->da9052, (offset >> 1) + | |
136 | DA9052_GPIO_0_1_REG, | |
137 | DA9052_GPIO_MASK_UPPER_NIBBLE, | |
138 | (register_value << | |
139 | DA9052_GPIO_NIBBLE_SHIFT)); | |
140 | else | |
141 | ret = da9052_reg_update(gpio->da9052, (offset >> 1) + | |
142 | DA9052_GPIO_0_1_REG, | |
143 | DA9052_GPIO_MASK_LOWER_NIBBLE, | |
144 | register_value); | |
145 | ||
146 | return ret; | |
147 | } | |
148 | ||
149 | static int da9052_gpio_direction_output(struct gpio_chip *gc, | |
150 | unsigned offset, int value) | |
151 | { | |
0f6082d2 | 152 | struct da9052_gpio *gpio = gpiochip_get_data(gc); |
07bfc915 | 153 | unsigned char register_value; |
154 | int ret; | |
155 | ||
156 | /* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */ | |
157 | register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 | | |
158 | value << 3; | |
159 | ||
160 | if (da9052_gpio_port_odd(offset)) | |
161 | ret = da9052_reg_update(gpio->da9052, (offset >> 1) + | |
162 | DA9052_GPIO_0_1_REG, | |
163 | DA9052_GPIO_MASK_UPPER_NIBBLE, | |
164 | (register_value << | |
165 | DA9052_GPIO_NIBBLE_SHIFT)); | |
166 | else | |
167 | ret = da9052_reg_update(gpio->da9052, (offset >> 1) + | |
168 | DA9052_GPIO_0_1_REG, | |
169 | DA9052_GPIO_MASK_LOWER_NIBBLE, | |
170 | register_value); | |
171 | ||
172 | return ret; | |
173 | } | |
174 | ||
175 | static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset) | |
176 | { | |
0f6082d2 | 177 | struct da9052_gpio *gpio = gpiochip_get_data(gc); |
07bfc915 | 178 | struct da9052 *da9052 = gpio->da9052; |
179 | ||
d511b9c3 FE |
180 | int irq; |
181 | ||
182 | irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset); | |
183 | ||
184 | return irq; | |
07bfc915 | 185 | } |
186 | ||
aeca8ad1 | 187 | static struct gpio_chip reference_gp = { |
07bfc915 | 188 | .label = "da9052-gpio", |
189 | .owner = THIS_MODULE, | |
190 | .get = da9052_gpio_get, | |
191 | .set = da9052_gpio_set, | |
192 | .direction_input = da9052_gpio_direction_input, | |
193 | .direction_output = da9052_gpio_direction_output, | |
194 | .to_irq = da9052_gpio_to_irq, | |
9fb1f39e | 195 | .can_sleep = true, |
87b9b0e0 AJ |
196 | .ngpio = 16, |
197 | .base = -1, | |
07bfc915 | 198 | }; |
199 | ||
3836309d | 200 | static int da9052_gpio_probe(struct platform_device *pdev) |
07bfc915 | 201 | { |
202 | struct da9052_gpio *gpio; | |
203 | struct da9052_pdata *pdata; | |
204 | int ret; | |
205 | ||
eb7cf95a | 206 | gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); |
afeb7b45 | 207 | if (!gpio) |
07bfc915 | 208 | return -ENOMEM; |
209 | ||
210 | gpio->da9052 = dev_get_drvdata(pdev->dev.parent); | |
e56aee18 | 211 | pdata = dev_get_platdata(gpio->da9052->dev); |
07bfc915 | 212 | |
07bfc915 | 213 | gpio->gp = reference_gp; |
214 | if (pdata && pdata->gpio_base) | |
215 | gpio->gp.base = pdata->gpio_base; | |
216 | ||
0f6082d2 | 217 | ret = gpiochip_add_data(&gpio->gp, gpio); |
07bfc915 | 218 | if (ret < 0) { |
219 | dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); | |
eb7cf95a | 220 | return ret; |
07bfc915 | 221 | } |
222 | ||
223 | platform_set_drvdata(pdev, gpio); | |
224 | ||
225 | return 0; | |
07bfc915 | 226 | } |
227 | ||
206210ce | 228 | static int da9052_gpio_remove(struct platform_device *pdev) |
07bfc915 | 229 | { |
230 | struct da9052_gpio *gpio = platform_get_drvdata(pdev); | |
07bfc915 | 231 | |
9f5132ae | 232 | gpiochip_remove(&gpio->gp); |
233 | return 0; | |
07bfc915 | 234 | } |
235 | ||
236 | static struct platform_driver da9052_gpio_driver = { | |
237 | .probe = da9052_gpio_probe, | |
8283c4ff | 238 | .remove = da9052_gpio_remove, |
07bfc915 | 239 | .driver = { |
240 | .name = "da9052-gpio", | |
07bfc915 | 241 | }, |
242 | }; | |
243 | ||
6f61415e | 244 | module_platform_driver(da9052_gpio_driver); |
07bfc915 | 245 | |
246 | MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); | |
247 | MODULE_DESCRIPTION("DA9052 GPIO Device Driver"); | |
248 | MODULE_LICENSE("GPL"); | |
249 | MODULE_ALIAS("platform:da9052-gpio"); |