aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/IR/ir-sysfs.c
blob: 2098dd1488e00647245057653ef6c1decb514026 (plain)
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
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
/* ir-sysfs.c - sysfs interface for RC devices (/sys/class/rc)
 *
 * Copyright (C) 2009-2010 by Mauro Carvalho Chehab <mchehab@redhat.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 version 2 of the License.
 *
 *  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/slab.h>
#include <linux/input.h>
#include <linux/device.h>
#include "ir-core-priv.h"

#define IRRCV_NUM_DEVICES	256

/* bit array to represent IR sysfs device number */
static unsigned long ir_core_dev_number;

/* class for /sys/class/rc */
static char *ir_devnode(struct device *dev, mode_t *mode)
{
	return kasprintf(GFP_KERNEL, "rc/%s", dev_name(dev));
}

static struct class ir_input_class = {
	.name		= "rc",
	.devnode	= ir_devnode,
};

/**
 * show_protocol() - shows the current IR protocol
 * @d:		the device descriptor
 * @mattr:	the device attribute struct (unused)
 * @buf:	a pointer to the output buffer
 *
 * This routine is a callback routine for input read the IR protocol type.
 * it is trigged by reading /sys/class/rc/rc?/current_protocol.
 * It returns the protocol name, as understood by the driver.
 */
static ssize_t show_protocol(struct device *d,
			     struct device_attribute *mattr, char *buf)
{
	char *s;
	struct ir_input_dev *ir_dev = dev_get_drvdata(d);
	u64 ir_type = ir_dev->rc_tab.ir_type;

	IR_dprintk(1, "Current protocol is %lld\n", (long long)ir_type);

	/* FIXME: doesn't support multiple protocols at the same time */
	if (ir_type == IR_TYPE_UNKNOWN)
		s = "Unknown";
	else if (ir_type == IR_TYPE_RC5)
		s = "rc-5";
	else if (ir_type == IR_TYPE_NEC)
		s = "nec";
	else if (ir_type == IR_TYPE_RC6)
		s = "rc6";
	else if (ir_type == IR_TYPE_JVC)
		s = "jvc";
	else if (ir_type == IR_TYPE_SONY)
		s = "sony";
	else
		s = "other";

	return sprintf(buf, "%s\n", s);
}

/**
 * store_protocol() - shows the current IR protocol
 * @d:		the device descriptor
 * @mattr:	the device attribute struct (unused)
 * @buf:	a pointer to the input buffer
 * @len:	length of the input buffer
 *
 * This routine is a callback routine for changing the IR protocol type.
 * it is trigged by reading /sys/class/rc/rc?/current_protocol.
 * It changes the IR the protocol name, if the IR type is recognized
 * by the driver.
 * If an unknown protocol name is used, returns -EINVAL.
 */
static ssize_t store_protocol(struct device *d,
			      struct device_attribute *mattr,
			      const char *data,
			      size_t len)
{
	struct ir_input_dev *ir_dev = dev_get_drvdata(d);
	u64 ir_type = 0;
	int rc = -EINVAL;
	unsigned long flags;
	char *buf;

	while ((buf = strsep((char **) &data, " \n")) != NULL) {
		if (!strcasecmp(buf, "rc-5") || !strcasecmp(buf, "rc5"))
			ir_type |= IR_TYPE_RC5;
		if (!strcasecmp(buf, "nec"))
			ir_type |= IR_TYPE_NEC;
		if (!strcasecmp(buf, "jvc"))
			ir_type |= IR_TYPE_JVC;
		if (!strcasecmp(buf, "sony"))
			ir_type |= IR_TYPE_SONY;
	}

	if (!ir_type) {
		IR_dprintk(1, "Unknown protocol\n");
		return -EINVAL;
	}

	if (ir_dev->props && ir_dev->props->change_protocol)
		rc = ir_dev->props->change_protocol(ir_dev->props->priv,
						    ir_type);

	if (rc < 0) {
		IR_dprintk(1, "Error setting protocol to %lld\n",
			   (long long)ir_type);
		return -EINVAL;
	}

	spin_lock_irqsave(&ir_dev->rc_tab.lock, flags);
	ir_dev->rc_tab.ir_type = ir_type;
	spin_unlock_irqrestore(&ir_dev->rc_tab.lock, flags);

	IR_dprintk(1, "Current protocol(s) is(are) %lld\n",
		   (long long)ir_type);

	return len;
}

static ssize_t show_supported_protocols(struct device *d,
			     struct device_attribute *mattr, char *buf)
{
	char *orgbuf = buf;
	struct ir_input_dev *ir_dev = dev_get_drvdata(d);

	/* FIXME: doesn't support multiple protocols at the same time */
	if (ir_dev->props->allowed_protos == IR_TYPE_UNKNOWN)
		buf += sprintf(buf, "unknown ");
	if (ir_dev->props->allowed_protos & IR_TYPE_RC5)
		buf += sprintf(buf, "rc-5 ");
	if (ir_dev->props->allowed_protos & IR_TYPE_NEC)
		buf += sprintf(buf, "nec ");
	if (buf == orgbuf)
		buf += sprintf(buf, "other ");

	buf += sprintf(buf - 1, "\n");

	return buf - orgbuf;
}

#define ADD_HOTPLUG_VAR(fmt, val...)					\
	do {								\
		int err = add_uevent_var(env, fmt, val);		\
		if (err)						\
			return err;					\
	} while (0)

static int ir_dev_uevent(struct device *device, struct kobj_uevent_env *env)
{
	struct ir_input_dev *ir_dev = dev_get_drvdata(device);

	if (ir_dev->rc_tab.name)
		ADD_HOTPLUG_VAR("NAME=%s", ir_dev->rc_tab.name);
	if (ir_dev->driver_name)
		ADD_HOTPLUG_VAR("DRV_NAME=%s", ir_dev->driver_name);

	return 0;
}

/*
 * Static device attribute struct with the sysfs attributes for IR's
 */
static DEVICE_ATTR(protocol, S_IRUGO | S_IWUSR,
		   show_protocol, store_protocol);

static DEVICE_ATTR(supported_protocols, S_IRUGO | S_IWUSR,
		   show_supported_protocols, NULL);

static struct attribute *ir_hw_dev_attrs[] = {
	&dev_attr_protocol.attr,
	&dev_attr_supported_protocols.attr,
	NULL,
};

static struct attribute_group ir_hw_dev_attr_grp = {
	.attrs	= ir_hw_dev_attrs,
};

static const struct attribute_group *ir_hw_dev_attr_groups[] = {
	&ir_hw_dev_attr_grp,
	NULL
};

static struct device_type rc_dev_type = {
	.groups		= ir_hw_dev_attr_groups,
	.uevent		= ir_dev_uevent,
};

static struct device_type ir_raw_dev_type = {
	.uevent		= ir_dev_uevent,
};

/**
 * ir_register_class() - creates the sysfs for /sys/class/rc/rc?
 * @input_dev:	the struct input_dev descriptor of the device
 *
 * This routine is used to register the syfs code for IR class
 */
int ir_register_class(struct input_dev *input_dev)
{
	int rc;
	const char *path;
	struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
	int devno = find_first_zero_bit(&ir_core_dev_number,
					IRRCV_NUM_DEVICES);

	if (unlikely(devno < 0))
		return devno;

	if (ir_dev->props) {
		if (ir_dev->props->driver_type == RC_DRIVER_SCANCODE)
			ir_dev->dev.type = &rc_dev_type;
	} else
		ir_dev->dev.type = &ir_raw_dev_type;

	ir_dev->dev.class = &ir_input_class;
	ir_dev->dev.parent = input_dev->dev.parent;
	dev_set_name(&ir_dev->dev, "rc%d", devno);
	dev_set_drvdata(&ir_dev->dev, ir_dev);
	rc = device_register(&ir_dev->dev);
	if (rc)
		return rc;


	input_dev->dev.parent = &ir_dev->dev;
	rc = input_register_device(input_dev);
	if (rc < 0) {
		device_del(&ir_dev->dev);
		return rc;
	}

	__module_get(THIS_MODULE);

	path = kobject_get_path(&ir_dev->dev.kobj, GFP_KERNEL);
	printk(KERN_INFO "%s: %s as %s\n",
		dev_name(&ir_dev->dev),
		input_dev->name ? input_dev->name : "Unspecified device",
		path ? path : "N/A");
	kfree(path);

	ir_dev->devno = devno;
	set_bit(devno, &ir_core_dev_number);

	return 0;
};

/**
 * ir_unregister_class() - removes the sysfs for sysfs for
 *			   /sys/class/rc/rc?
 * @input_dev:	the struct input_dev descriptor of the device
 *
 * This routine is used to unregister the syfs code for IR class
 */
void ir_unregister_class(struct input_dev *input_dev)
{
	struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);

	clear_bit(ir_dev->devno, &ir_core_dev_number);
	input_unregister_device(input_dev);
	device_del(&ir_dev->dev);

	module_put(THIS_MODULE);
}

/*
 * Init/exit code for the module. Basically, creates/removes /sys/class/rc
 */

static int __init ir_core_init(void)
{
	int rc = class_register(&ir_input_class);
	if (rc) {
		printk(KERN_ERR "ir_core: unable to register rc class\n");
		return rc;
	}

	/* Initialize/load the decoders/keymap code that will be used */
	ir_raw_init();

	return 0;
}

static void __exit ir_core_exit(void)
{
	class_unregister(&ir_input_class);
}

module_init(ir_core_init);
module_exit(ir_core_exit);