1 /* ir-sysfs.c - sysfs interface for RC devices (/sys/class/rc)
3 * Copyright (C) 2009-2010 by Mauro Carvalho Chehab <mchehab@redhat.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation version 2 of the License.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
15 #include <linux/slab.h>
16 #include <linux/input.h>
17 #include <linux/device.h>
18 #include "ir-core-priv.h"
20 #define IRRCV_NUM_DEVICES 256
22 /* bit array to represent IR sysfs device number */
23 static unsigned long ir_core_dev_number
;
25 /* class for /sys/class/rc */
26 static char *ir_devnode(struct device
*dev
, mode_t
*mode
)
28 return kasprintf(GFP_KERNEL
, "rc/%s", dev_name(dev
));
31 static struct class ir_input_class
= {
33 .devnode
= ir_devnode
,
40 { IR_TYPE_UNKNOWN
, "unknown" },
41 { IR_TYPE_RC5
, "rc-5" },
42 { IR_TYPE_NEC
, "nec" },
43 { IR_TYPE_RC6
, "rc-6" },
44 { IR_TYPE_JVC
, "jvc" },
45 { IR_TYPE_SONY
, "sony" },
46 { IR_TYPE_RC5_SZ
, "rc-5-sz" },
47 { IR_TYPE_LIRC
, "lirc" },
50 #define PROTO_NONE "none"
53 * show_protocols() - shows the current IR protocol(s)
54 * @d: the device descriptor
55 * @mattr: the device attribute struct (unused)
56 * @buf: a pointer to the output buffer
58 * This routine is a callback routine for input read the IR protocol type(s).
59 * it is trigged by reading /sys/class/rc/rc?/protocols.
60 * It returns the protocol names of supported protocols.
61 * Enabled protocols are printed in brackets.
63 static ssize_t
show_protocols(struct device
*d
,
64 struct device_attribute
*mattr
, char *buf
)
66 struct ir_input_dev
*ir_dev
= dev_get_drvdata(d
);
71 /* Device is being removed */
75 if (ir_dev
->props
&& ir_dev
->props
->driver_type
== RC_DRIVER_SCANCODE
) {
76 enabled
= ir_dev
->rc_tab
.ir_type
;
77 allowed
= ir_dev
->props
->allowed_protos
;
78 } else if (ir_dev
->raw
) {
79 enabled
= ir_dev
->raw
->enabled_protocols
;
80 allowed
= ir_raw_get_allowed_protocols();
82 return sprintf(tmp
, "[builtin]\n");
84 IR_dprintk(1, "allowed - 0x%llx, enabled - 0x%llx\n",
88 for (i
= 0; i
< ARRAY_SIZE(proto_names
); i
++) {
89 if (allowed
& enabled
& proto_names
[i
].type
)
90 tmp
+= sprintf(tmp
, "[%s] ", proto_names
[i
].name
);
91 else if (allowed
& proto_names
[i
].type
)
92 tmp
+= sprintf(tmp
, "%s ", proto_names
[i
].name
);
102 * store_protocols() - changes the current IR protocol(s)
103 * @d: the device descriptor
104 * @mattr: the device attribute struct (unused)
105 * @buf: a pointer to the input buffer
106 * @len: length of the input buffer
108 * This routine is a callback routine for changing the IR protocol type.
109 * It is trigged by writing to /sys/class/rc/rc?/protocols.
110 * Writing "+proto" will add a protocol to the list of enabled protocols.
111 * Writing "-proto" will remove a protocol from the list of enabled protocols.
112 * Writing "proto" will enable only "proto".
113 * Writing "none" will disable all protocols.
114 * Returns -EINVAL if an invalid protocol combination or unknown protocol name
115 * is used, otherwise @len.
117 static ssize_t
store_protocols(struct device
*d
,
118 struct device_attribute
*mattr
,
122 struct ir_input_dev
*ir_dev
= dev_get_drvdata(d
);
123 bool enable
, disable
;
127 int rc
, i
, count
= 0;
130 /* Device is being removed */
134 if (ir_dev
->props
&& ir_dev
->props
->driver_type
== RC_DRIVER_SCANCODE
)
135 type
= ir_dev
->rc_tab
.ir_type
;
136 else if (ir_dev
->raw
)
137 type
= ir_dev
->raw
->enabled_protocols
;
139 IR_dprintk(1, "Protocol switching not supported\n");
143 while ((tmp
= strsep((char **) &data
, " \n")) != NULL
) {
151 } else if (*tmp
== '-') {
160 if (!enable
&& !disable
&& !strncasecmp(tmp
, PROTO_NONE
, sizeof(PROTO_NONE
))) {
161 tmp
+= sizeof(PROTO_NONE
);
165 for (i
= 0; i
< ARRAY_SIZE(proto_names
); i
++) {
166 if (!strncasecmp(tmp
, proto_names
[i
].name
, strlen(proto_names
[i
].name
))) {
167 tmp
+= strlen(proto_names
[i
].name
);
168 mask
= proto_names
[i
].type
;
172 if (i
== ARRAY_SIZE(proto_names
)) {
173 IR_dprintk(1, "Unknown protocol: '%s'\n", tmp
);
188 IR_dprintk(1, "Protocol not specified\n");
192 if (ir_dev
->props
&& ir_dev
->props
->change_protocol
) {
193 rc
= ir_dev
->props
->change_protocol(ir_dev
->props
->priv
,
196 IR_dprintk(1, "Error setting protocols to 0x%llx\n",
202 if (ir_dev
->props
&& ir_dev
->props
->driver_type
== RC_DRIVER_SCANCODE
) {
203 spin_lock_irqsave(&ir_dev
->rc_tab
.lock
, flags
);
204 ir_dev
->rc_tab
.ir_type
= type
;
205 spin_unlock_irqrestore(&ir_dev
->rc_tab
.lock
, flags
);
207 ir_dev
->raw
->enabled_protocols
= type
;
210 IR_dprintk(1, "Current protocol(s): 0x%llx\n",
216 #define ADD_HOTPLUG_VAR(fmt, val...) \
218 int err = add_uevent_var(env, fmt, val); \
223 static int rc_dev_uevent(struct device
*device
, struct kobj_uevent_env
*env
)
225 struct ir_input_dev
*ir_dev
= dev_get_drvdata(device
);
227 if (ir_dev
->rc_tab
.name
)
228 ADD_HOTPLUG_VAR("NAME=%s", ir_dev
->rc_tab
.name
);
229 if (ir_dev
->driver_name
)
230 ADD_HOTPLUG_VAR("DRV_NAME=%s", ir_dev
->driver_name
);
236 * Static device attribute struct with the sysfs attributes for IR's
238 static DEVICE_ATTR(protocols
, S_IRUGO
| S_IWUSR
,
239 show_protocols
, store_protocols
);
241 static struct attribute
*rc_dev_attrs
[] = {
242 &dev_attr_protocols
.attr
,
246 static struct attribute_group rc_dev_attr_grp
= {
247 .attrs
= rc_dev_attrs
,
250 static const struct attribute_group
*rc_dev_attr_groups
[] = {
255 static struct device_type rc_dev_type
= {
256 .groups
= rc_dev_attr_groups
,
257 .uevent
= rc_dev_uevent
,
261 * ir_register_class() - creates the sysfs for /sys/class/rc/rc?
262 * @input_dev: the struct input_dev descriptor of the device
264 * This routine is used to register the syfs code for IR class
266 int ir_register_class(struct input_dev
*input_dev
)
268 struct ir_input_dev
*ir_dev
= input_get_drvdata(input_dev
);
269 int devno
= find_first_zero_bit(&ir_core_dev_number
,
272 if (unlikely(devno
< 0))
275 ir_dev
->dev
.type
= &rc_dev_type
;
276 ir_dev
->devno
= devno
;
278 ir_dev
->dev
.class = &ir_input_class
;
279 ir_dev
->dev
.parent
= input_dev
->dev
.parent
;
280 input_dev
->dev
.parent
= &ir_dev
->dev
;
281 dev_set_name(&ir_dev
->dev
, "rc%d", devno
);
282 dev_set_drvdata(&ir_dev
->dev
, ir_dev
);
283 return device_register(&ir_dev
->dev
);
287 * ir_register_input - registers ir input device with input subsystem
288 * @input_dev: the struct input_dev descriptor of the device
291 int ir_register_input(struct input_dev
*input_dev
)
293 struct ir_input_dev
*ir_dev
= input_get_drvdata(input_dev
);
298 rc
= input_register_device(input_dev
);
300 device_del(&ir_dev
->dev
);
304 __module_get(THIS_MODULE
);
306 path
= kobject_get_path(&ir_dev
->dev
.kobj
, GFP_KERNEL
);
307 printk(KERN_INFO
"%s: %s as %s\n",
308 dev_name(&ir_dev
->dev
),
309 input_dev
->name
? input_dev
->name
: "Unspecified device",
310 path
? path
: "N/A");
313 set_bit(ir_dev
->devno
, &ir_core_dev_number
);
318 * ir_unregister_class() - removes the sysfs for sysfs for
320 * @input_dev: the struct input_dev descriptor of the device
322 * This routine is used to unregister the syfs code for IR class
324 void ir_unregister_class(struct input_dev
*input_dev
)
326 struct ir_input_dev
*ir_dev
= input_get_drvdata(input_dev
);
328 input_set_drvdata(input_dev
, NULL
);
329 clear_bit(ir_dev
->devno
, &ir_core_dev_number
);
330 input_unregister_device(input_dev
);
331 device_del(&ir_dev
->dev
);
333 module_put(THIS_MODULE
);
337 * Init/exit code for the module. Basically, creates/removes /sys/class/rc
340 static int __init
ir_core_init(void)
342 int rc
= class_register(&ir_input_class
);
344 printk(KERN_ERR
"ir_core: unable to register rc class\n");
348 /* Initialize/load the decoders/keymap code that will be used */
355 static void __exit
ir_core_exit(void)
357 class_unregister(&ir_input_class
);
361 module_init(ir_core_init
);
362 module_exit(ir_core_exit
);