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
241
242
243
244
245
246
247
248
249
250
251
252
253
|
/* Copyright (c) 2012, Code Aurora Forum. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only 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/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/irq.h>
#include <media/rc-core.h>
#include <media/gpio-ir-recv.h>
#define GPIO_IR_DRIVER_NAME "gpio-rc-recv"
#define GPIO_IR_DEVICE_NAME "gpio_ir_recv"
struct gpio_rc_dev {
struct rc_dev *rcdev;
int gpio_nr;
bool active_low;
};
#ifdef CONFIG_OF
/*
* Translate OpenFirmware node properties into platform_data
*/
static int gpio_ir_recv_get_devtree_pdata(struct device *dev,
struct gpio_ir_recv_platform_data *pdata)
{
struct device_node *np = dev->of_node;
enum of_gpio_flags flags;
int gpio;
gpio = of_get_gpio_flags(np, 0, &flags);
if (gpio < 0) {
if (gpio != -EPROBE_DEFER)
dev_err(dev, "Failed to get gpio flags (%d)\n", gpio);
return gpio;
}
pdata->gpio_nr = gpio;
pdata->active_low = (flags & OF_GPIO_ACTIVE_LOW);
/* probe() takes care of map_name == NULL or allowed_protos == 0 */
pdata->map_name = of_get_property(np, "linux,rc-map-name", NULL);
pdata->allowed_protos = 0;
return 0;
}
static struct of_device_id gpio_ir_recv_of_match[] = {
{ .compatible = "gpio-ir-receiver", },
{ },
};
MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match);
#else /* !CONFIG_OF */
#define gpio_ir_recv_get_devtree_pdata(dev, pdata) (-ENOSYS)
#endif
static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id)
{
struct gpio_rc_dev *gpio_dev = dev_id;
int gval;
int rc = 0;
enum raw_event_type type = IR_SPACE;
gval = gpio_get_value_cansleep(gpio_dev->gpio_nr);
if (gval < 0)
goto err_get_value;
if (gpio_dev->active_low)
gval = !gval;
if (gval == 1)
type = IR_PULSE;
rc = ir_raw_event_store_edge(gpio_dev->rcdev, type);
if (rc < 0)
goto err_get_value;
ir_raw_event_handle(gpio_dev->rcdev);
err_get_value:
return IRQ_HANDLED;
}
static int gpio_ir_recv_probe(struct platform_device *pdev)
{
struct gpio_rc_dev *gpio_dev;
struct rc_dev *rcdev;
const struct gpio_ir_recv_platform_data *pdata =
pdev->dev.platform_data;
int rc;
if (pdev->dev.of_node) {
struct gpio_ir_recv_platform_data *dtpdata =
devm_kzalloc(&pdev->dev, sizeof(*dtpdata), GFP_KERNEL);
if (!dtpdata)
return -ENOMEM;
rc = gpio_ir_recv_get_devtree_pdata(&pdev->dev, dtpdata);
if (rc)
return rc;
pdata = dtpdata;
}
if (!pdata)
return -EINVAL;
if (pdata->gpio_nr < 0)
return -EINVAL;
gpio_dev = kzalloc(sizeof(struct gpio_rc_dev), GFP_KERNEL);
if (!gpio_dev)
return -ENOMEM;
rcdev = rc_allocate_device();
if (!rcdev) {
rc = -ENOMEM;
goto err_allocate_device;
}
rcdev->priv = gpio_dev;
rcdev->driver_type = RC_DRIVER_IR_RAW;
rcdev->input_name = GPIO_IR_DEVICE_NAME;
rcdev->input_phys = GPIO_IR_DEVICE_NAME "/input0";
rcdev->input_id.bustype = BUS_HOST;
rcdev->input_id.vendor = 0x0001;
rcdev->input_id.product = 0x0001;
rcdev->input_id.version = 0x0100;
rcdev->dev.parent = &pdev->dev;
rcdev->driver_name = GPIO_IR_DRIVER_NAME;
if (pdata->allowed_protos)
rc_set_allowed_protocols(rcdev, pdata->allowed_protos);
else
rc_set_allowed_protocols(rcdev, RC_BIT_ALL);
rcdev->map_name = pdata->map_name ?: RC_MAP_EMPTY;
gpio_dev->rcdev = rcdev;
gpio_dev->gpio_nr = pdata->gpio_nr;
gpio_dev->active_low = pdata->active_low;
rc = gpio_request(pdata->gpio_nr, "gpio-ir-recv");
if (rc < 0)
goto err_gpio_request;
rc = gpio_direction_input(pdata->gpio_nr);
if (rc < 0)
goto err_gpio_direction_input;
rc = rc_register_device(rcdev);
if (rc < 0) {
dev_err(&pdev->dev, "failed to register rc device\n");
goto err_register_rc_device;
}
platform_set_drvdata(pdev, gpio_dev);
rc = request_any_context_irq(gpio_to_irq(pdata->gpio_nr),
gpio_ir_recv_irq,
IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
"gpio-ir-recv-irq", gpio_dev);
if (rc < 0)
goto err_request_irq;
return 0;
err_request_irq:
rc_unregister_device(rcdev);
rcdev = NULL;
err_register_rc_device:
err_gpio_direction_input:
gpio_free(pdata->gpio_nr);
err_gpio_request:
rc_free_device(rcdev);
err_allocate_device:
kfree(gpio_dev);
return rc;
}
static int gpio_ir_recv_remove(struct platform_device *pdev)
{
struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
free_irq(gpio_to_irq(gpio_dev->gpio_nr), gpio_dev);
rc_unregister_device(gpio_dev->rcdev);
gpio_free(gpio_dev->gpio_nr);
kfree(gpio_dev);
return 0;
}
#ifdef CONFIG_PM
static int gpio_ir_recv_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
if (device_may_wakeup(dev))
enable_irq_wake(gpio_to_irq(gpio_dev->gpio_nr));
else
disable_irq(gpio_to_irq(gpio_dev->gpio_nr));
return 0;
}
static int gpio_ir_recv_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
if (device_may_wakeup(dev))
disable_irq_wake(gpio_to_irq(gpio_dev->gpio_nr));
else
enable_irq(gpio_to_irq(gpio_dev->gpio_nr));
return 0;
}
static const struct dev_pm_ops gpio_ir_recv_pm_ops = {
.suspend = gpio_ir_recv_suspend,
.resume = gpio_ir_recv_resume,
};
#endif
static struct platform_driver gpio_ir_recv_driver = {
.probe = gpio_ir_recv_probe,
.remove = gpio_ir_recv_remove,
.driver = {
.name = GPIO_IR_DRIVER_NAME,
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(gpio_ir_recv_of_match),
#ifdef CONFIG_PM
.pm = &gpio_ir_recv_pm_ops,
#endif
},
};
module_platform_driver(gpio_ir_recv_driver);
MODULE_DESCRIPTION("GPIO IR Receiver driver");
MODULE_LICENSE("GPL v2");
|
