aboutsummaryrefslogtreecommitdiff
path: root/drivers/hid/hid-appleir.c
blob: a42e6a394c5ec33d663f7a00eadd2b362c24763d (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
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
/*
 * HID driver for the apple ir device
 *
 * Original driver written by James McKenzie
 * Ported to recent 2.6 kernel versions by Greg Kroah-Hartman <gregkh@suse.de>
 * Updated to support newer remotes by Bastien Nocera <hadess@hadess.net>
 * Ported to HID subsystem by Benjamin Tissoires <benjamin.tissoires@gmail.com>
 *
 * Copyright (C) 2006 James McKenzie
 * Copyright (C) 2008 Greg Kroah-Hartman <greg@kroah.com>
 * Copyright (C) 2008 Novell Inc.
 * Copyright (C) 2010, 2012 Bastien Nocera <hadess@hadess.net>
 * Copyright (C) 2013 Benjamin Tissoires <benjamin.tissoires@gmail.com>
 * Copyright (C) 2013 Red Hat Inc. All Rights Reserved
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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/device.h>
#include <linux/hid.h>
#include <linux/module.h>
#include "hid-ids.h"

MODULE_AUTHOR("James McKenzie");
MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@redhat.com>");
MODULE_DESCRIPTION("HID Apple IR remote controls");
MODULE_LICENSE("GPL");

#define KEY_MASK		0x0F
#define TWO_PACKETS_MASK	0x40

/*
 * James McKenzie has two devices both of which report the following
 * 25 87 ee 83 0a	+
 * 25 87 ee 83 0c	-
 * 25 87 ee 83 09	<<
 * 25 87 ee 83 06	>>
 * 25 87 ee 83 05	>"
 * 25 87 ee 83 03	menu
 * 26 00 00 00 00	for key repeat
 */

/*
 * Thomas Glanzmann reports the following responses
 * 25 87 ee ca 0b	+
 * 25 87 ee ca 0d	-
 * 25 87 ee ca 08	<<
 * 25 87 ee ca 07	>>
 * 25 87 ee ca 04	>"
 * 25 87 ee ca 02	menu
 * 26 00 00 00 00       for key repeat
 *
 * He also observes the following event sometimes
 * sent after a key is release, which I interpret
 * as a flat battery message
 * 25 87 e0 ca 06	flat battery
 */

/*
 * Alexandre Karpenko reports the following responses for Device ID 0x8242
 * 25 87 ee 47 0b	+
 * 25 87 ee 47 0d	-
 * 25 87 ee 47 08	<<
 * 25 87 ee 47 07	>>
 * 25 87 ee 47 04	>"
 * 25 87 ee 47 02	menu
 * 26 87 ee 47 **	for key repeat (** is the code of the key being held)
 */

/*
 * Bastien Nocera's remote
 * 25 87 ee 91 5f	followed by
 * 25 87 ee 91 05	gives you >"
 *
 * 25 87 ee 91 5c	followed by
 * 25 87 ee 91 05	gives you the middle button
 */

/*
 * Fabien Andre's remote
 * 25 87 ee a3 5e	followed by
 * 25 87 ee a3 04	gives you >"
 *
 * 25 87 ee a3 5d	followed by
 * 25 87 ee a3 04	gives you the middle button
 */

static const unsigned short appleir_key_table[] = {
	KEY_RESERVED,
	KEY_MENU,
	KEY_PLAYPAUSE,
	KEY_FORWARD,
	KEY_BACK,
	KEY_VOLUMEUP,
	KEY_VOLUMEDOWN,
	KEY_RESERVED,
	KEY_RESERVED,
	KEY_RESERVED,
	KEY_RESERVED,
	KEY_RESERVED,
	KEY_RESERVED,
	KEY_RESERVED,
	KEY_ENTER,
	KEY_PLAYPAUSE,
	KEY_RESERVED,
};

struct appleir {
	struct input_dev *input_dev;
	struct hid_device *hid;
	unsigned short keymap[ARRAY_SIZE(appleir_key_table)];
	struct timer_list key_up_timer;	/* timer for key up */
	spinlock_t lock;		/* protects .current_key */
	int current_key;		/* the currently pressed key */
	int prev_key_idx;		/* key index in a 2 packets message */
};

static int get_key(int data)
{
	/*
	 * The key is coded accross bits 2..9:
	 *
	 * 0x00 or 0x01 (        )	key:  0		-> KEY_RESERVED
	 * 0x02 or 0x03 (  menu  )	key:  1		-> KEY_MENU
	 * 0x04 or 0x05 (   >"   )	key:  2		-> KEY_PLAYPAUSE
	 * 0x06 or 0x07 (   >>   )	key:  3		-> KEY_FORWARD
	 * 0x08 or 0x09 (   <<   )	key:  4		-> KEY_BACK
	 * 0x0a or 0x0b (    +   )	key:  5		-> KEY_VOLUMEUP
	 * 0x0c or 0x0d (    -   )	key:  6		-> KEY_VOLUMEDOWN
	 * 0x0e or 0x0f (        )	key:  7		-> KEY_RESERVED
	 * 0x50 or 0x51 (        )	key:  8		-> KEY_RESERVED
	 * 0x52 or 0x53 (        )	key:  9		-> KEY_RESERVED
	 * 0x54 or 0x55 (        )	key: 10		-> KEY_RESERVED
	 * 0x56 or 0x57 (        )	key: 11		-> KEY_RESERVED
	 * 0x58 or 0x59 (        )	key: 12		-> KEY_RESERVED
	 * 0x5a or 0x5b (        )	key: 13		-> KEY_RESERVED
	 * 0x5c or 0x5d ( middle )	key: 14		-> KEY_ENTER
	 * 0x5e or 0x5f (   >"   )	key: 15		-> KEY_PLAYPAUSE
	 *
	 * Packets starting with 0x5 are part of a two-packets message,
	 * we notify the caller by sending a negative value.
	 */
	int key = (data >> 1) & KEY_MASK;

	if ((data & TWO_PACKETS_MASK))
		/* Part of a 2 packets-command */
		key = -key;

	return key;
}

static void key_up(struct hid_device *hid, struct appleir *appleir, int key)
{
	input_report_key(appleir->input_dev, key, 0);
	input_sync(appleir->input_dev);
}

static void key_down(struct hid_device *hid, struct appleir *appleir, int key)
{
	input_report_key(appleir->input_dev, key, 1);
	input_sync(appleir->input_dev);
}

static void battery_flat(struct appleir *appleir)
{
	dev_err(&appleir->input_dev->dev, "possible flat battery?\n");
}

static void key_up_tick(unsigned long data)
{
	struct appleir *appleir = (struct appleir *)data;
	struct hid_device *hid = appleir->hid;
	unsigned long flags;

	spin_lock_irqsave(&appleir->lock, flags);
	if (appleir->current_key) {
		key_up(hid, appleir, appleir->current_key);
		appleir->current_key = 0;
	}
	spin_unlock_irqrestore(&appleir->lock, flags);
}

static int appleir_raw_event(struct hid_device *hid, struct hid_report *report,
	 u8 *data, int len)
{
	struct appleir *appleir = hid_get_drvdata(hid);
	static const u8 keydown[] = { 0x25, 0x87, 0xee };
	static const u8 keyrepeat[] = { 0x26, };
	static const u8 flatbattery[] = { 0x25, 0x87, 0xe0 };
	unsigned long flags;

	if (len != 5)
		goto out;

	if (!memcmp(data, keydown, sizeof(keydown))) {
		int index;

		spin_lock_irqsave(&appleir->lock, flags);
		/*
		 * If we already have a key down, take it up before marking
		 * this one down
		 */
		if (appleir->current_key)
			key_up(hid, appleir, appleir->current_key);

		/* Handle dual packet commands */
		if (appleir->prev_key_idx > 0)
			index = appleir->prev_key_idx;
		else
			index = get_key(data[4]);

		if (index >= 0) {
			appleir->current_key = appleir->keymap[index];

			key_down(hid, appleir, appleir->current_key);
			/*
			 * Remote doesn't do key up, either pull them up, in
			 * the test above, or here set a timer which pulls
			 * them up after 1/8 s
			 */
			mod_timer(&appleir->key_up_timer, jiffies + HZ / 8);
			appleir->prev_key_idx = 0;
		} else
			/* Remember key for next packet */
			appleir->prev_key_idx = -index;
		spin_unlock_irqrestore(&appleir->lock, flags);
		goto out;
	}

	appleir->prev_key_idx = 0;

	if (!memcmp(data, keyrepeat, sizeof(keyrepeat))) {
		key_down(hid, appleir, appleir->current_key);
		/*
		 * Remote doesn't do key up, either pull them up, in the test
		 * above, or here set a timer which pulls them up after 1/8 s
		 */
		mod_timer(&appleir->key_up_timer, jiffies + HZ / 8);
		goto out;
	}

	if (!memcmp(data, flatbattery, sizeof(flatbattery))) {
		battery_flat(appleir);
		/* Fall through */
	}

out:
	/* let hidraw and hiddev handle the report */
	return 0;
}

static void appleir_input_configured(struct hid_device *hid,
		struct hid_input *hidinput)
{
	struct input_dev *input_dev = hidinput->input;
	struct appleir *appleir = hid_get_drvdata(hid);
	int i;

	appleir->input_dev = input_dev;

	input_dev->keycode = appleir->keymap;
	input_dev->keycodesize = sizeof(unsigned short);
	input_dev->keycodemax = ARRAY_SIZE(appleir->keymap);

	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP);

	memcpy(appleir->keymap, appleir_key_table, sizeof(appleir->keymap));
	for (i = 0; i < ARRAY_SIZE(appleir_key_table); i++)
		set_bit(appleir->keymap[i], input_dev->keybit);
	clear_bit(KEY_RESERVED, input_dev->keybit);
}

static int appleir_input_mapping(struct hid_device *hid,
		struct hid_input *hi, struct hid_field *field,
		struct hid_usage *usage, unsigned long **bit, int *max)
{
	return -1;
}

static int appleir_probe(struct hid_device *hid, const struct hid_device_id *id)
{
	int ret;
	struct appleir *appleir;

	appleir = kzalloc(sizeof(struct appleir), GFP_KERNEL);
	if (!appleir) {
		ret = -ENOMEM;
		goto allocfail;
	}

	appleir->hid = hid;

	spin_lock_init(&appleir->lock);
	setup_timer(&appleir->key_up_timer,
		    key_up_tick, (unsigned long) appleir);

	hid_set_drvdata(hid, appleir);

	ret = hid_parse(hid);
	if (ret) {
		hid_err(hid, "parse failed\n");
		goto fail;
	}

	ret = hid_hw_start(hid, HID_CONNECT_DEFAULT | HID_CONNECT_HIDDEV_FORCE);
	if (ret) {
		hid_err(hid, "hw start failed\n");
		goto fail;
	}

	return 0;
fail:
	kfree(appleir);
allocfail:
	return ret;
}

static void appleir_remove(struct hid_device *hid)
{
	struct appleir *appleir = hid_get_drvdata(hid);
	hid_hw_stop(hid);
	del_timer_sync(&appleir->key_up_timer);
	kfree(appleir);
}

static const struct hid_device_id appleir_devices[] = {
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_IRCONTROL) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_IRCONTROL2) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_IRCONTROL3) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_IRCONTROL4) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_IRCONTROL5) },
	{ }
};
MODULE_DEVICE_TABLE(hid, appleir_devices);

static struct hid_driver appleir_driver = {
	.name = "appleir",
	.id_table = appleir_devices,
	.raw_event = appleir_raw_event,
	.input_configured = appleir_input_configured,
	.probe = appleir_probe,
	.remove = appleir_remove,
	.input_mapping = appleir_input_mapping,
};
module_hid_driver(appleir_driver);