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
|
/*
* Copyright 2015 Verifone Int.
*
* Author: Nicolas Saenz Julienne <nicolassaenzj@gmail.com>
*
* This program is free software; you can redistribute it and/or modify i t
* under the terms of the GNU General Public License as published by th e
* Free Software Foundation; either version 2 of the License, or (at you r
* option) any later version.
*
* This driver is based on the gpio-tps65912 implementation.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/gpio/driver.h>
#include <linux/platform_device.h>
#include <linux/mfd/tps65218.h>
#include "gpiolib.h"
struct tps65218_gpio {
struct tps65218 *tps65218;
struct gpio_chip gpio_chip;
};
static int tps65218_gpio_get(struct gpio_chip *gc, unsigned offset)
{
struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
struct tps65218 *tps65218 = tps65218_gpio->tps65218;
unsigned int val;
int ret;
ret = tps65218_reg_read(tps65218, TPS65218_REG_ENABLE2, &val);
if (ret)
return ret;
return !!(val & (TPS65218_ENABLE2_GPIO1 << offset));
}
static void tps65218_gpio_set(struct gpio_chip *gc, unsigned offset,
int value)
{
struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
struct tps65218 *tps65218 = tps65218_gpio->tps65218;
if (value)
tps65218_set_bits(tps65218, TPS65218_REG_ENABLE2,
TPS65218_ENABLE2_GPIO1 << offset,
TPS65218_ENABLE2_GPIO1 << offset,
TPS65218_PROTECT_L1);
else
tps65218_clear_bits(tps65218, TPS65218_REG_ENABLE2,
TPS65218_ENABLE2_GPIO1 << offset,
TPS65218_PROTECT_L1);
}
static int tps65218_gpio_output(struct gpio_chip *gc, unsigned offset,
int value)
{
/* Only drives GPOs */
tps65218_gpio_set(gc, offset, value);
return 0;
}
static int tps65218_gpio_input(struct gpio_chip *gc, unsigned offset)
{
return -EPERM;
}
static int tps65218_gpio_request(struct gpio_chip *gc, unsigned offset)
{
struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
struct tps65218 *tps65218 = tps65218_gpio->tps65218;
int ret;
if (gpiochip_line_is_open_source(gc, offset)) {
dev_err(gc->parent, "can't work as open source\n");
return -EINVAL;
}
switch (offset) {
case 0:
if (!gpiochip_line_is_open_drain(gc, offset)) {
dev_err(gc->parent, "GPO1 works only as open drain\n");
return -EINVAL;
}
/* Disable sequencer for GPO1 */
ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
TPS65218_SEQ7_GPO1_SEQ_MASK,
TPS65218_PROTECT_L1);
if (ret)
return ret;
/* Setup GPO1 */
ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
TPS65218_CONFIG1_IO1_SEL,
TPS65218_PROTECT_L1);
if (ret)
return ret;
break;
case 1:
/* GP02 is push-pull by default, can be set as open drain. */
if (gpiochip_line_is_open_drain(gc, offset)) {
ret = tps65218_clear_bits(tps65218,
TPS65218_REG_CONFIG1,
TPS65218_CONFIG1_GPO2_BUF,
TPS65218_PROTECT_L1);
if (ret)
return ret;
}
/* Setup GPO2 */
ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
TPS65218_CONFIG1_IO1_SEL,
TPS65218_PROTECT_L1);
if (ret)
return ret;
break;
case 2:
if (!gpiochip_line_is_open_drain(gc, offset)) {
dev_err(gc->parent, "GPO3 works only as open drain\n");
return -EINVAL;
}
/* Disable sequencer for GPO3 */
ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
TPS65218_SEQ7_GPO3_SEQ_MASK,
TPS65218_PROTECT_L1);
if (ret)
return ret;
/* Setup GPO3 */
ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG2,
TPS65218_CONFIG2_DC12_RST,
TPS65218_PROTECT_L1);
if (ret)
return ret;
break;
default:
return -EINVAL;
}
return 0;
}
static struct gpio_chip template_chip = {
.label = "gpio-tps65218",
.owner = THIS_MODULE,
.request = tps65218_gpio_request,
.direction_output = tps65218_gpio_output,
.direction_input = tps65218_gpio_input,
.get = tps65218_gpio_get,
.set = tps65218_gpio_set,
.can_sleep = true,
.ngpio = 3,
.base = -1,
};
static int tps65218_gpio_probe(struct platform_device *pdev)
{
struct tps65218 *tps65218 = dev_get_drvdata(pdev->dev.parent);
struct tps65218_gpio *tps65218_gpio;
int ret;
tps65218_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65218_gpio),
GFP_KERNEL);
if (!tps65218_gpio)
return -ENOMEM;
tps65218_gpio->tps65218 = tps65218;
tps65218_gpio->gpio_chip = template_chip;
tps65218_gpio->gpio_chip.parent = &pdev->dev;
#ifdef CONFIG_OF_GPIO
tps65218_gpio->gpio_chip.of_node = pdev->dev.of_node;
#endif
ret = gpiochip_add_data(&tps65218_gpio->gpio_chip, tps65218_gpio);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret);
return ret;
}
platform_set_drvdata(pdev, tps65218_gpio);
return ret;
}
static int tps65218_gpio_remove(struct platform_device *pdev)
{
struct tps65218_gpio *tps65218_gpio = platform_get_drvdata(pdev);
gpiochip_remove(&tps65218_gpio->gpio_chip);
return 0;
}
static const struct of_device_id tps65218_dt_match[] = {
{ .compatible = "ti,tps65218-gpio" },
{ }
};
MODULE_DEVICE_TABLE(of, tps65218_dt_match);
static struct platform_driver tps65218_gpio_driver = {
.driver = {
.name = "tps65218-gpio",
.of_match_table = of_match_ptr(tps65218_dt_match)
},
.probe = tps65218_gpio_probe,
.remove = tps65218_gpio_remove,
};
module_platform_driver(tps65218_gpio_driver);
MODULE_AUTHOR("Nicolas Saenz Julienne <nicolassaenzj@gmail.com>");
MODULE_DESCRIPTION("GPO interface for TPS65218 PMICs");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:tps65218-gpio");
|
