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/driver.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 unsigned char da9052_gpio_port_odd(unsigned offset)
55{
56 return offset % 2;
57}
58
59static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset)
60{
61 struct da9052_gpio *gpio = gpiochip_get_data(gc);
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;
87 return !!(ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset)));
88 case DA9052_OUTPUT_PUSHPULL:
89 if (da9052_gpio_port_odd(offset))
90 return !!(ret & DA9052_GPIO_ODD_PORT_MODE);
91 else
92 return !!(ret & DA9052_GPIO_EVEN_PORT_MODE);
93 default:
94 return -EINVAL;
95 }
96}
97
98static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
99{
100 struct da9052_gpio *gpio = gpiochip_get_data(gc);
101 int ret;
102
103 if (da9052_gpio_port_odd(offset)) {
104 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
105 DA9052_GPIO_0_1_REG,
106 DA9052_GPIO_ODD_PORT_MODE,
107 value << DA9052_GPIO_ODD_SHIFT);
108 if (ret != 0)
109 dev_err(gpio->da9052->dev,
110 "Failed to updated gpio odd reg,%d",
111 ret);
112 } else {
113 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
114 DA9052_GPIO_0_1_REG,
115 DA9052_GPIO_EVEN_PORT_MODE,
116 value << DA9052_GPIO_EVEN_SHIFT);
117 if (ret != 0)
118 dev_err(gpio->da9052->dev,
119 "Failed to updated gpio even reg,%d",
120 ret);
121 }
122}
123
124static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
125{
126 struct da9052_gpio *gpio = gpiochip_get_data(gc);
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
149static int da9052_gpio_direction_output(struct gpio_chip *gc,
150 unsigned offset, int value)
151{
152 struct da9052_gpio *gpio = gpiochip_get_data(gc);
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
175static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
176{
177 struct da9052_gpio *gpio = gpiochip_get_data(gc);
178 struct da9052 *da9052 = gpio->da9052;
179
180 int irq;
181
182 irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset);
183
184 return irq;
185}
186
187static const struct gpio_chip reference_gp = {
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,
195 .can_sleep = true,
196 .ngpio = 16,
197 .base = -1,
198};
199
200static int da9052_gpio_probe(struct platform_device *pdev)
201{
202 struct da9052_gpio *gpio;
203 struct da9052_pdata *pdata;
204 int ret;
205
206 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
207 if (!gpio)
208 return -ENOMEM;
209
210 gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
211 pdata = dev_get_platdata(gpio->da9052->dev);
212
213 gpio->gp = reference_gp;
214 if (pdata && pdata->gpio_base)
215 gpio->gp.base = pdata->gpio_base;
216
217 ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
218 if (ret < 0) {
219 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
220 return ret;
221 }
222
223 platform_set_drvdata(pdev, gpio);
224
225 return 0;
226}
227
228static struct platform_driver da9052_gpio_driver = {
229 .probe = da9052_gpio_probe,
230 .driver = {
231 .name = "da9052-gpio",
232 },
233};
234
235module_platform_driver(da9052_gpio_driver);
236
237MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
238MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
239MODULE_LICENSE("GPL");
240MODULE_ALIAS("platform:da9052-gpio");
241