1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
/*
* GPIO Driver for Dialog DA9052 PMICs.
*
* Copyright(c) 2011 Dialog Semiconductor Ltd.
*
* Author: David Dajun Chen <dchen@diasemi.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/syscalls.h>
#include <linux/seq_file.h>
#include <linux/mfd/da9052/da9052.h>
#include <linux/mfd/da9052/reg.h>
#include <linux/mfd/da9052/pdata.h>
#define DA9052_INPUT 1
#define DA9052_OUTPUT_OPENDRAIN 2
#define DA9052_OUTPUT_PUSHPULL 3
#define DA9052_SUPPLY_VDD_IO1 0
#define DA9052_DEBOUNCING_OFF 0
#define DA9052_DEBOUNCING_ON 1
#define DA9052_OUTPUT_LOWLEVEL 0
#define DA9052_ACTIVE_LOW 0
#define DA9052_ACTIVE_HIGH 1
#define DA9052_GPIO_MAX_PORTS_PER_REGISTER 8
#define DA9052_GPIO_SHIFT_COUNT(no) (no%8)
#define DA9052_GPIO_MASK_UPPER_NIBBLE 0xF0
#define DA9052_GPIO_MASK_LOWER_NIBBLE 0x0F
#define DA9052_GPIO_NIBBLE_SHIFT 4
#define DA9052_IRQ_GPI0 16
#define DA9052_GPIO_ODD_SHIFT 7
#define DA9052_GPIO_EVEN_SHIFT 3
struct da9052_gpio {
struct da9052 *da9052;
struct gpio_chip gp;
};
static unsigned char da9052_gpio_port_odd(unsigned offset)
{
return offset % 2;
}
static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset)
{
struct da9052_gpio *gpio = gpiochip_get_data(gc);
int da9052_port_direction = 0;
int ret;
ret = da9052_reg_read(gpio->da9052,
DA9052_GPIO_0_1_REG + (offset >> 1));
if (ret < 0)
return ret;
if (da9052_gpio_port_odd(offset)) {
da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN;
da9052_port_direction >>= 4;
} else {
da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN;
}
switch (da9052_port_direction) {
case DA9052_INPUT:
if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER)
ret = da9052_reg_read(gpio->da9052,
DA9052_STATUS_C_REG);
else
ret = da9052_reg_read(gpio->da9052,
DA9052_STATUS_D_REG);
if (ret < 0)
return ret;
return !!(ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset)));
case DA9052_OUTPUT_PUSHPULL:
if (da9052_gpio_port_odd(offset))
return !!(ret & DA9052_GPIO_ODD_PORT_MODE);
else
return !!(ret & DA9052_GPIO_EVEN_PORT_MODE);
default:
return -EINVAL;
}
}
static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
{
struct da9052_gpio *gpio = gpiochip_get_data(gc);
int ret;
if (da9052_gpio_port_odd(offset)) {
ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
DA9052_GPIO_0_1_REG,
DA9052_GPIO_ODD_PORT_MODE,
value << DA9052_GPIO_ODD_SHIFT);
if (ret != 0)
dev_err(gpio->da9052->dev,
"Failed to updated gpio odd reg,%d",
ret);
} else {
ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
DA9052_GPIO_0_1_REG,
DA9052_GPIO_EVEN_PORT_MODE,
value << DA9052_GPIO_EVEN_SHIFT);
if (ret != 0)
dev_err(gpio->da9052->dev,
"Failed to updated gpio even reg,%d",
ret);
}
}
static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
{
struct da9052_gpio *gpio = gpiochip_get_data(gc);
unsigned char register_value;
int ret;
/* Format: function - 2 bits type - 1 bit mode - 1 bit */
register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 |
DA9052_DEBOUNCING_ON << 3;
if (da9052_gpio_port_odd(offset))
ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
DA9052_GPIO_0_1_REG,
DA9052_GPIO_MASK_UPPER_NIBBLE,
(register_value <<
DA9052_GPIO_NIBBLE_SHIFT));
else
ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
DA9052_GPIO_0_1_REG,
DA9052_GPIO_MASK_LOWER_NIBBLE,
register_value);
return ret;
}
static int da9052_gpio_direction_output(struct gpio_chip *gc,
unsigned offset, int value)
{
struct da9052_gpio *gpio = gpiochip_get_data(gc);
unsigned char register_value;
int ret;
/* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */
register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 |
value << 3;
if (da9052_gpio_port_odd(offset))
ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
DA9052_GPIO_0_1_REG,
DA9052_GPIO_MASK_UPPER_NIBBLE,
(register_value <<
DA9052_GPIO_NIBBLE_SHIFT));
else
ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
DA9052_GPIO_0_1_REG,
DA9052_GPIO_MASK_LOWER_NIBBLE,
register_value);
return ret;
}
static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
{
struct da9052_gpio *gpio = gpiochip_get_data(gc);
struct da9052 *da9052 = gpio->da9052;
int irq;
irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset);
return irq;
}
static const struct gpio_chip reference_gp = {
.label = "da9052-gpio",
.owner = THIS_MODULE,
.get = da9052_gpio_get,
.set = da9052_gpio_set,
.direction_input = da9052_gpio_direction_input,
.direction_output = da9052_gpio_direction_output,
.to_irq = da9052_gpio_to_irq,
.can_sleep = true,
.ngpio = 16,
.base = -1,
};
static int da9052_gpio_probe(struct platform_device *pdev)
{
struct da9052_gpio *gpio;
struct da9052_pdata *pdata;
int ret;
gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
if (!gpio)
return -ENOMEM;
gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
pdata = dev_get_platdata(gpio->da9052->dev);
gpio->gp = reference_gp;
if (pdata && pdata->gpio_base)
gpio->gp.base = pdata->gpio_base;
ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
if (ret < 0) {
dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
return ret;
}
platform_set_drvdata(pdev, gpio);
return 0;
}
static struct platform_driver da9052_gpio_driver = {
.probe = da9052_gpio_probe,
.driver = {
.name = "da9052-gpio",
},
};
module_platform_driver(da9052_gpio_driver);
MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:da9052-gpio");
|
