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
|
// SPDX-License-Identifier: GPL-2.0
/*
* GPIO driver for TPS68470 PMIC
*
* Copyright (C) 2017 Intel Corporation
*
* Authors:
* Antti Laakso <antti.laakso@intel.com>
* Tianshu Qiu <tian.shu.qiu@intel.com>
* Jian Xu Zheng <jian.xu.zheng@intel.com>
* Yuning Pu <yuning.pu@intel.com>
*/
#include <linux/gpio/driver.h>
#include <linux/mfd/tps68470.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#define TPS68470_N_LOGIC_OUTPUT 3
#define TPS68470_N_REGULAR_GPIO 7
#define TPS68470_N_GPIO (TPS68470_N_LOGIC_OUTPUT + TPS68470_N_REGULAR_GPIO)
struct tps68470_gpio_data {
struct regmap *tps68470_regmap;
struct gpio_chip gc;
};
static int tps68470_gpio_get(struct gpio_chip *gc, unsigned int offset)
{
struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
struct regmap *regmap = tps68470_gpio->tps68470_regmap;
unsigned int reg = TPS68470_REG_GPDO;
int val, ret;
if (offset >= TPS68470_N_REGULAR_GPIO) {
offset -= TPS68470_N_REGULAR_GPIO;
reg = TPS68470_REG_SGPO;
}
ret = regmap_read(regmap, reg, &val);
if (ret) {
dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n",
TPS68470_REG_SGPO);
return ret;
}
return !!(val & BIT(offset));
}
/* Return 0 if output, 1 if input */
static int tps68470_gpio_get_direction(struct gpio_chip *gc,
unsigned int offset)
{
struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
struct regmap *regmap = tps68470_gpio->tps68470_regmap;
int val, ret;
/* rest are always outputs */
if (offset >= TPS68470_N_REGULAR_GPIO)
return 0;
ret = regmap_read(regmap, TPS68470_GPIO_CTL_REG_A(offset), &val);
if (ret) {
dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n",
TPS68470_GPIO_CTL_REG_A(offset));
return ret;
}
val &= TPS68470_GPIO_MODE_MASK;
return val >= TPS68470_GPIO_MODE_OUT_CMOS ? 0 : 1;
}
static void tps68470_gpio_set(struct gpio_chip *gc, unsigned int offset,
int value)
{
struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
struct regmap *regmap = tps68470_gpio->tps68470_regmap;
unsigned int reg = TPS68470_REG_GPDO;
if (offset >= TPS68470_N_REGULAR_GPIO) {
reg = TPS68470_REG_SGPO;
offset -= TPS68470_N_REGULAR_GPIO;
}
regmap_update_bits(regmap, reg, BIT(offset), value ? BIT(offset) : 0);
}
static int tps68470_gpio_output(struct gpio_chip *gc, unsigned int offset,
int value)
{
struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
struct regmap *regmap = tps68470_gpio->tps68470_regmap;
/* rest are always outputs */
if (offset >= TPS68470_N_REGULAR_GPIO)
return 0;
/* Set the initial value */
tps68470_gpio_set(gc, offset, value);
return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset),
TPS68470_GPIO_MODE_MASK,
TPS68470_GPIO_MODE_OUT_CMOS);
}
static int tps68470_gpio_input(struct gpio_chip *gc, unsigned int offset)
{
struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
struct regmap *regmap = tps68470_gpio->tps68470_regmap;
/* rest are always outputs */
if (offset >= TPS68470_N_REGULAR_GPIO)
return -EINVAL;
return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset),
TPS68470_GPIO_MODE_MASK, 0x00);
}
static const char *tps68470_names[TPS68470_N_GPIO] = {
"gpio.0", "gpio.1", "gpio.2", "gpio.3",
"gpio.4", "gpio.5", "gpio.6",
"s_enable", "s_idle", "s_resetn",
};
static int tps68470_gpio_probe(struct platform_device *pdev)
{
struct tps68470_gpio_data *tps68470_gpio;
int ret;
tps68470_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps68470_gpio),
GFP_KERNEL);
if (!tps68470_gpio)
return -ENOMEM;
tps68470_gpio->tps68470_regmap = dev_get_drvdata(pdev->dev.parent);
tps68470_gpio->gc.label = "tps68470-gpio";
tps68470_gpio->gc.owner = THIS_MODULE;
tps68470_gpio->gc.direction_input = tps68470_gpio_input;
tps68470_gpio->gc.direction_output = tps68470_gpio_output;
tps68470_gpio->gc.get = tps68470_gpio_get;
tps68470_gpio->gc.get_direction = tps68470_gpio_get_direction;
tps68470_gpio->gc.set = tps68470_gpio_set;
tps68470_gpio->gc.can_sleep = true;
tps68470_gpio->gc.names = tps68470_names;
tps68470_gpio->gc.ngpio = TPS68470_N_GPIO;
tps68470_gpio->gc.base = -1;
tps68470_gpio->gc.parent = &pdev->dev;
ret = devm_gpiochip_add_data(&pdev->dev, &tps68470_gpio->gc,
tps68470_gpio);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to register gpio_chip: %d\n", ret);
return ret;
}
platform_set_drvdata(pdev, tps68470_gpio);
return ret;
}
static struct platform_driver tps68470_gpio_driver = {
.driver = {
.name = "tps68470-gpio",
},
.probe = tps68470_gpio_probe,
};
builtin_platform_driver(tps68470_gpio_driver)
|
