blob: 56dd047d58443d911ebe4ac4ef85e44a18f149f8 [file] [log] [blame]
ashishj307bfc912011-07-06 16:02:13 +05301/*
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>
ashishj307bfc912011-07-06 16:02:13 +053025
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
Ashish Jangam87b9b0e2011-12-15 14:55:46 +053045#define DA9052_IRQ_GPI0 16
46#define DA9052_GPIO_ODD_SHIFT 7
47#define DA9052_GPIO_EVEN_SHIFT 3
ashishj307bfc912011-07-06 16:02:13 +053048
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);
ashishj307bfc912011-07-06 16:02:13 +0530109 int ret;
110
111 if (da9052_gpio_port_odd(offset)) {
ashishj307bfc912011-07-06 16:02:13 +0530112 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
113 DA9052_GPIO_0_1_REG,
114 DA9052_GPIO_ODD_PORT_MODE,
Ashish Jangam87b9b0e2011-12-15 14:55:46 +0530115 value << DA9052_GPIO_ODD_SHIFT);
ashishj307bfc912011-07-06 16:02:13 +0530116 if (ret != 0)
117 dev_err(gpio->da9052->dev,
118 "Failed to updated gpio odd reg,%d",
119 ret);
ashishj307bfc912011-07-06 16:02:13 +0530120 } else {
ashishj307bfc912011-07-06 16:02:13 +0530121 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
122 DA9052_GPIO_0_1_REG,
123 DA9052_GPIO_EVEN_PORT_MODE,
Ashish Jangam87b9b0e2011-12-15 14:55:46 +0530124 value << DA9052_GPIO_EVEN_SHIFT);
ashishj307bfc912011-07-06 16:02:13 +0530125 if (ret != 0)
126 dev_err(gpio->da9052->dev,
127 "Failed to updated gpio even reg,%d",
128 ret);
ashishj307bfc912011-07-06 16:02:13 +0530129 }
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 /* 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
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 /* 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
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 return da9052->irq_base + DA9052_IRQ_GPI0 + offset;
189}
190
191static 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,
Ashish Jangam87b9b0e2011-12-15 14:55:46 +0530199 .can_sleep = 1,
200 .ngpio = 16,
201 .base = -1,
ashishj307bfc912011-07-06 16:02:13 +0530202};
203
204static int __devinit da9052_gpio_probe(struct platform_device *pdev)
205{
206 struct da9052_gpio *gpio;
207 struct da9052_pdata *pdata;
208 int ret;
209
210 gpio = kzalloc(sizeof(*gpio), GFP_KERNEL);
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
ashishj307bfc912011-07-06 16:02:13 +0530217 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);
224 goto err_mem;
225 }
226
227 platform_set_drvdata(pdev, gpio);
228
229 return 0;
230
231err_mem:
232 kfree(gpio);
233 return ret;
234}
235
236static int __devexit da9052_gpio_remove(struct platform_device *pdev)
237{
238 struct da9052_gpio *gpio = platform_get_drvdata(pdev);
239 int ret;
240
241 ret = gpiochip_remove(&gpio->gp);
242 if (ret == 0)
243 kfree(gpio);
244
245 return ret;
246}
247
248static struct platform_driver da9052_gpio_driver = {
249 .probe = da9052_gpio_probe,
250 .remove = __devexit_p(da9052_gpio_remove),
251 .driver = {
252 .name = "da9052-gpio",
253 .owner = THIS_MODULE,
254 },
255};
256
Mark Brown6f614152011-12-08 00:24:00 +0800257module_platform_driver(da9052_gpio_driver);
ashishj307bfc912011-07-06 16:02:13 +0530258
259MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
260MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
261MODULE_LICENSE("GPL");
262MODULE_ALIAS("platform:da9052-gpio");