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
|
/*
* Intel INT3496 ACPI device extcon driver
*
* Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com>
*
* Based on android x86 kernel code which is:
*
* Copyright (c) 2014, Intel Corporation.
* Author: David Cohen <david.a.cohen@linux.intel.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/acpi.h>
#include <linux/extcon.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#define INT3496_GPIO_USB_ID 0
#define INT3496_GPIO_VBUS_EN 1
#define INT3496_GPIO_USB_MUX 2
#define DEBOUNCE_TIME msecs_to_jiffies(50)
struct int3496_data {
struct device *dev;
struct extcon_dev *edev;
struct delayed_work work;
struct gpio_desc *gpio_usb_id;
struct gpio_desc *gpio_vbus_en;
struct gpio_desc *gpio_usb_mux;
int usb_id_irq;
};
static const unsigned int int3496_cable[] = {
EXTCON_USB_HOST,
EXTCON_NONE,
};
static const struct acpi_gpio_params id_gpios = { INT3496_GPIO_USB_ID, 0, false };
static const struct acpi_gpio_params vbus_gpios = { INT3496_GPIO_VBUS_EN, 0, false };
static const struct acpi_gpio_params mux_gpios = { INT3496_GPIO_USB_MUX, 0, false };
static const struct acpi_gpio_mapping acpi_int3496_default_gpios[] = {
{ "id-gpios", &id_gpios, 1 },
{ "vbus-gpios", &vbus_gpios, 1 },
{ "mux-gpios", &mux_gpios, 1 },
{ },
};
static void int3496_do_usb_id(struct work_struct *work)
{
struct int3496_data *data =
container_of(work, struct int3496_data, work.work);
int id = gpiod_get_value_cansleep(data->gpio_usb_id);
/* id == 1: PERIPHERAL, id == 0: HOST */
dev_dbg(data->dev, "Connected %s cable\n", id ? "PERIPHERAL" : "HOST");
/*
* Peripheral: set USB mux to peripheral and disable VBUS
* Host: set USB mux to host and enable VBUS
*/
if (!IS_ERR(data->gpio_usb_mux))
gpiod_direction_output(data->gpio_usb_mux, id);
if (!IS_ERR(data->gpio_vbus_en))
gpiod_direction_output(data->gpio_vbus_en, !id);
extcon_set_state_sync(data->edev, EXTCON_USB_HOST, !id);
}
static irqreturn_t int3496_thread_isr(int irq, void *priv)
{
struct int3496_data *data = priv;
/* Let the pin settle before processing it */
mod_delayed_work(system_wq, &data->work, DEBOUNCE_TIME);
return IRQ_HANDLED;
}
static int int3496_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct int3496_data *data;
int ret;
ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev),
acpi_int3496_default_gpios);
if (ret) {
dev_err(dev, "can't add GPIO ACPI mapping\n");
return ret;
}
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->dev = dev;
INIT_DELAYED_WORK(&data->work, int3496_do_usb_id);
data->gpio_usb_id = devm_gpiod_get_index(dev, "id",
INT3496_GPIO_USB_ID,
GPIOD_IN);
if (IS_ERR(data->gpio_usb_id)) {
ret = PTR_ERR(data->gpio_usb_id);
dev_err(dev, "can't request USB ID GPIO: %d\n", ret);
return ret;
}
data->usb_id_irq = gpiod_to_irq(data->gpio_usb_id);
if (data->usb_id_irq < 0) {
dev_err(dev, "can't get USB ID IRQ: %d\n", data->usb_id_irq);
return data->usb_id_irq;
}
data->gpio_vbus_en = devm_gpiod_get_index(dev, "vbus",
INT3496_GPIO_VBUS_EN,
GPIOD_ASIS);
if (IS_ERR(data->gpio_vbus_en))
dev_info(dev, "can't request VBUS EN GPIO\n");
data->gpio_usb_mux = devm_gpiod_get_index(dev, "mux",
INT3496_GPIO_USB_MUX,
GPIOD_ASIS);
if (IS_ERR(data->gpio_usb_mux))
dev_info(dev, "can't request USB MUX GPIO\n");
/* register extcon device */
data->edev = devm_extcon_dev_allocate(dev, int3496_cable);
if (IS_ERR(data->edev))
return -ENOMEM;
ret = devm_extcon_dev_register(dev, data->edev);
if (ret < 0) {
dev_err(dev, "can't register extcon device: %d\n", ret);
return ret;
}
ret = devm_request_threaded_irq(dev, data->usb_id_irq,
NULL, int3496_thread_isr,
IRQF_SHARED | IRQF_ONESHOT |
IRQF_TRIGGER_RISING |
IRQF_TRIGGER_FALLING,
dev_name(dev), data);
if (ret < 0) {
dev_err(dev, "can't request IRQ for USB ID GPIO: %d\n", ret);
return ret;
}
/* queue initial processing of id-pin */
queue_delayed_work(system_wq, &data->work, 0);
platform_set_drvdata(pdev, data);
return 0;
}
static int int3496_remove(struct platform_device *pdev)
{
struct int3496_data *data = platform_get_drvdata(pdev);
devm_free_irq(&pdev->dev, data->usb_id_irq, data);
cancel_delayed_work_sync(&data->work);
acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev));
return 0;
}
static struct acpi_device_id int3496_acpi_match[] = {
{ "INT3496" },
{ }
};
MODULE_DEVICE_TABLE(acpi, int3496_acpi_match);
static struct platform_driver int3496_driver = {
.driver = {
.name = "intel-int3496",
.acpi_match_table = int3496_acpi_match,
},
.probe = int3496_probe,
.remove = int3496_remove,
};
module_platform_driver(int3496_driver);
MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_DESCRIPTION("Intel INT3496 ACPI device extcon driver");
MODULE_LICENSE("GPL");
|
