summaryrefslogtreecommitdiffstats
path: root/drivers/input/misc/cm109.c
blob: b09c7d127219f19c4ae04b4a2ce545e639278d27 (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
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
/*
 * Driver for the VoIP USB phones with CM109 chipsets.
 *
 * Copyright (C) 2007 - 2008 Alfred E. Heggestad <aeh@db.org>
 *
 *	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.
 */

/*
 *   Tested devices:
 *	- Komunikate KIP1000
 *	- Genius G-talk
 *	- Allied-Telesis Corega USBPH01
 *	- ...
 *
 * This driver is based on the yealink.c driver
 *
 * Thanks to:
 *   - Authors of yealink.c
 *   - Thomas Reitmayr
 *   - Oliver Neukum for good review comments and code
 *   - Shaun Jackman <sjackman@gmail.com> for Genius G-talk keymap
 *   - Dmitry Torokhov for valuable input and review
 *
 * Todo:
 *   - Read/write EEPROM
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/rwsem.h>
#include <linux/usb/input.h>

#define DRIVER_VERSION "20080805"
#define DRIVER_AUTHOR  "Alfred E. Heggestad"
#define DRIVER_DESC    "CM109 phone driver"

static char *phone = "kip1000";
module_param(phone, charp, S_IRUSR);
MODULE_PARM_DESC(phone, "Phone name {kip1000, gtalk, usbph01, atcom}");

enum {
	/* HID Registers */
	HID_IR0 = 0x00, /* Record/Playback-mute button, Volume up/down  */
	HID_IR1 = 0x01, /* GPI, generic registers or EEPROM_DATA0       */
	HID_IR2 = 0x02, /* Generic registers or EEPROM_DATA1            */
	HID_IR3 = 0x03, /* Generic registers or EEPROM_CTRL             */
	HID_OR0 = 0x00, /* Mapping control, buzzer, SPDIF (offset 0x04) */
	HID_OR1 = 0x01, /* GPO - General Purpose Output                 */
	HID_OR2 = 0x02, /* Set GPIO to input/output mode                */
	HID_OR3 = 0x03, /* SPDIF status channel or EEPROM_CTRL          */

	/* HID_IR0 */
	RECORD_MUTE   = 1 << 3,
	PLAYBACK_MUTE = 1 << 2,
	VOLUME_DOWN   = 1 << 1,
	VOLUME_UP     = 1 << 0,

	/* HID_OR0 */
	/* bits 7-6
	   0: HID_OR1-2 are used for GPO; HID_OR0, 3 are used for buzzer
	      and SPDIF
	   1: HID_OR0-3 are used as generic HID registers
	   2: Values written to HID_OR0-3 are also mapped to MCU_CTRL,
	      EEPROM_DATA0-1, EEPROM_CTRL (see Note)
	   3: Reserved
	 */
	HID_OR_GPO_BUZ_SPDIF   = 0 << 6,
	HID_OR_GENERIC_HID_REG = 1 << 6,
	HID_OR_MAP_MCU_EEPROM  = 2 << 6,

	BUZZER_ON = 1 << 5,

	/* up to 256 normal keys, up to 16 special keys */
	KEYMAP_SIZE = 256 + 16,
};

/* CM109 protocol packet */
struct cm109_ctl_packet {
	u8 byte[4];
} __attribute__ ((packed));

enum { USB_PKT_LEN = sizeof(struct cm109_ctl_packet) };

/* CM109 device structure */
struct cm109_dev {
	struct input_dev *idev;	 /* input device */
	struct usb_device *udev; /* usb device */
	struct usb_interface *intf;

	/* irq input channel */
	struct cm109_ctl_packet *irq_data;
	dma_addr_t irq_dma;
	struct urb *urb_irq;

	/* control output channel */
	struct cm109_ctl_packet *ctl_data;
	dma_addr_t ctl_dma;
	struct usb_ctrlrequest *ctl_req;
	struct urb *urb_ctl;
	/*
	 * The 3 bitfields below are protected by ctl_submit_lock.
	 * They have to be separate since they are accessed from IRQ
	 * context.
	 */
	unsigned irq_urb_pending:1;	/* irq_urb is in flight */
	unsigned ctl_urb_pending:1;	/* ctl_urb is in flight */
	unsigned buzzer_pending:1;	/* need to issue buzz command */
	spinlock_t ctl_submit_lock;

	unsigned char buzzer_state;	/* on/off */

	/* flags */
	unsigned open:1;
	unsigned resetting:1;
	unsigned shutdown:1;

	/* This mutex protects writes to the above flags */
	struct mutex pm_mutex;

	unsigned short keymap[KEYMAP_SIZE];

	char phys[64];		/* physical device path */
	int key_code;		/* last reported key */
	int keybit;		/* 0=new scan  1,2,4,8=scan columns  */
	u8 gpi;			/* Cached value of GPI (high nibble) */
};

/******************************************************************************
 * CM109 key interface
 *****************************************************************************/

static unsigned short special_keymap(int code)
{
	if (code > 0xff) {
		switch (code - 0xff) {
		case RECORD_MUTE:	return KEY_MUTE;
		case PLAYBACK_MUTE:	return KEY_MUTE;
		case VOLUME_DOWN:	return KEY_VOLUMEDOWN;
		case VOLUME_UP:		return KEY_VOLUMEUP;
		}
	}
	return KEY_RESERVED;
}

/* Map device buttons to internal key events.
 *
 * The "up" and "down" keys, are symbolised by arrows on the button.
 * The "pickup" and "hangup" keys are symbolised by a green and red phone
 * on the button.

 Komunikate KIP1000 Keyboard Matrix

     -> -- 1 -- 2 -- 3  --> GPI pin 4 (0x10)
      |    |    |    |
     <- -- 4 -- 5 -- 6  --> GPI pin 5 (0x20)
      |    |    |    |
     END - 7 -- 8 -- 9  --> GPI pin 6 (0x40)
      |    |    |    |
     OK -- * -- 0 -- #  --> GPI pin 7 (0x80)
      |    |    |    |

     /|\  /|\  /|\  /|\
      |    |    |    |
GPO
pin:  3    2    1    0
     0x8  0x4  0x2  0x1

 */
static unsigned short keymap_kip1000(int scancode)
{
	switch (scancode) {				/* phone key:   */
	case 0x82: return KEY_NUMERIC_0;		/*   0          */
	case 0x14: return KEY_NUMERIC_1;		/*   1          */
	case 0x12: return KEY_NUMERIC_2;		/*   2          */
	case 0x11: return KEY_NUMERIC_3;		/*   3          */
	case 0x24: return KEY_NUMERIC_4;		/*   4          */
	case 0x22: return KEY_NUMERIC_5;		/*   5          */
	case 0x21: return KEY_NUMERIC_6;		/*   6          */
	case 0x44: return KEY_NUMERIC_7;		/*   7          */
	case 0x42: return KEY_NUMERIC_8;		/*   8          */
	case 0x41: return KEY_NUMERIC_9;		/*   9          */
	case 0x81: return KEY_NUMERIC_POUND;		/*   #          */
	case 0x84: return KEY_NUMERIC_STAR;		/*   *          */
	case 0x88: return KEY_ENTER;			/*   pickup     */
	case 0x48: return KEY_ESC;			/*   hangup     */
	case 0x28: return KEY_LEFT;			/*   IN         */
	case 0x18: return KEY_RIGHT;			/*   OUT        */
	default:   return special_keymap(scancode);
	}
}

/*
  Contributed by Shaun Jackman <sjackman@gmail.com>

  Genius G-Talk keyboard matrix
     0 1 2 3
  4: 0 4 8 Talk
  5: 1 5 9 End
  6: 2 6 # Up
  7: 3 7 * Down
*/
static unsigned short keymap_gtalk(int scancode)
{
	switch (scancode) {
	case 0x11: return KEY_NUMERIC_0;
	case 0x21: return KEY_NUMERIC_1;
	case 0x41: return KEY_NUMERIC_2;
	case 0x81: return KEY_NUMERIC_3;
	case 0x12: return KEY_NUMERIC_4;
	case 0x22: return KEY_NUMERIC_5;
	case 0x42: return KEY_NUMERIC_6;
	case 0x82: return KEY_NUMERIC_7;
	case 0x14: return KEY_NUMERIC_8;
	case 0x24: return KEY_NUMERIC_9;
	case 0x44: return KEY_NUMERIC_POUND;	/* # */
	case 0x84: return KEY_NUMERIC_STAR;	/* * */
	case 0x18: return KEY_ENTER;		/* Talk (green handset) */
	case 0x28: return KEY_ESC;		/* End (red handset) */
	case 0x48: return KEY_UP;		/* Menu up (rocker switch) */
	case 0x88: return KEY_DOWN;		/* Menu down (rocker switch) */
	default:   return special_keymap(scancode);
	}
}

/*
 * Keymap for Allied-Telesis Corega USBPH01
 * http://www.alliedtelesis-corega.com/2/1344/1437/1360/chprd.html
 *
 * Contributed by july@nat.bg
 */
static unsigned short keymap_usbph01(int scancode)
{
	switch (scancode) {
	case 0x11: return KEY_NUMERIC_0;		/*   0          */
	case 0x21: return KEY_NUMERIC_1;		/*   1          */
	case 0x41: return KEY_NUMERIC_2;		/*   2          */
	case 0x81: return KEY_NUMERIC_3;		/*   3          */
	case 0x12: return KEY_NUMERIC_4;		/*   4          */
	case 0x22: return KEY_NUMERIC_5;		/*   5          */
	case 0x42: return KEY_NUMERIC_6;		/*   6          */
	case 0x82: return KEY_NUMERIC_7;		/*   7          */
	case 0x14: return KEY_NUMERIC_8;		/*   8          */
	case 0x24: return KEY_NUMERIC_9;		/*   9          */
	case 0x44: return KEY_NUMERIC_POUND;		/*   #          */
	case 0x84: return KEY_NUMERIC_STAR;		/*   *          */
	case 0x18: return KEY_ENTER;			/*   pickup     */
	case 0x28: return KEY_ESC;			/*   hangup     */
	case 0x48: return KEY_LEFT;			/*   IN         */
	case 0x88: return KEY_RIGHT;			/*   OUT        */
	default:   return special_keymap(scancode);
	}
}

/*
 * Keymap for ATCom AU-100
 * http://www.atcom.cn/products.html 
 * http://www.packetizer.com/products/au100/
 * http://www.voip-info.org/wiki/view/AU-100
 *
 * Contributed by daniel@gimpelevich.san-francisco.ca.us
 */
static unsigned short keymap_atcom(int scancode)
{
	switch (scancode) {				/* phone key:   */
	case 0x82: return KEY_NUMERIC_0;		/*   0          */
	case 0x11: return KEY_NUMERIC_1;		/*   1          */
	case 0x12: return KEY_NUMERIC_2;		/*   2          */
	case 0x14: return KEY_NUMERIC_3;		/*   3          */
	case 0x21: return KEY_NUMERIC_4;		/*   4          */
	case 0x22: return KEY_NUMERIC_5;		/*   5          */
	case 0x24: return KEY_NUMERIC_6;		/*   6          */
	case 0x41: return KEY_NUMERIC_7;		/*   7          */
	case 0x42: return KEY_NUMERIC_8;		/*   8          */
	case 0x44: return KEY_NUMERIC_9;		/*   9          */
	case 0x84: return KEY_NUMERIC_POUND;		/*   #          */
	case 0x81: return KEY_NUMERIC_STAR;		/*   *          */
	case 0x18: return KEY_ENTER;			/*   pickup     */
	case 0x28: return KEY_ESC;			/*   hangup     */
	case 0x48: return KEY_LEFT;			/* left arrow   */
	case 0x88: return KEY_RIGHT;			/* right arrow  */
	default:   return special_keymap(scancode);
	}
}

static unsigned short (*keymap)(int) = keymap_kip1000;

/*
 * Completes a request by converting the data into events for the
 * input subsystem.
 */
static void report_key(struct cm109_dev *dev, int key)
{
	struct input_dev *idev = dev->idev;

	if (dev->key_code >= 0) {
		/* old key up */
		input_report_key(idev, dev->key_code, 0);
	}

	dev->key_code = key;
	if (key >= 0) {
		/* new valid key */
		input_report_key(idev, key, 1);
	}

	input_sync(idev);
}

/******************************************************************************
 * CM109 usb communication interface
 *****************************************************************************/

static void cm109_submit_buzz_toggle(struct cm109_dev *dev)
{
	int error;

	if (dev->buzzer_state)
		dev->ctl_data->byte[HID_OR0] |= BUZZER_ON;
	else
		dev->ctl_data->byte[HID_OR0] &= ~BUZZER_ON;

	error = usb_submit_urb(dev->urb_ctl, GFP_ATOMIC);
	if (error)
		err("%s: usb_submit_urb (urb_ctl) failed %d", __func__, error);
}

/*
 * IRQ handler
 */
static void cm109_urb_irq_callback(struct urb *urb)
{
	struct cm109_dev *dev = urb->context;
	const int status = urb->status;
	int error;

	dev_dbg(&urb->dev->dev, "### URB IRQ: [0x%02x 0x%02x 0x%02x 0x%02x] keybit=0x%02x\n",
	     dev->irq_data->byte[0],
	     dev->irq_data->byte[1],
	     dev->irq_data->byte[2],
	     dev->irq_data->byte[3],
	     dev->keybit);

	if (status) {
		if (status == -ESHUTDOWN)
			return;
		err("%s: urb status %d", __func__, status);
	}

	/* Special keys */
	if (dev->irq_data->byte[HID_IR0] & 0x0f) {
		const int code = (dev->irq_data->byte[HID_IR0] & 0x0f);
		report_key(dev, dev->keymap[0xff + code]);
	}

	/* Scan key column */
	if (dev->keybit == 0xf) {

		/* Any changes ? */
		if ((dev->gpi & 0xf0) == (dev->irq_data->byte[HID_IR1] & 0xf0))
			goto out;

		dev->gpi = dev->irq_data->byte[HID_IR1] & 0xf0;
		dev->keybit = 0x1;
	} else {
		report_key(dev, dev->keymap[dev->irq_data->byte[HID_IR1]]);

		dev->keybit <<= 1;
		if (dev->keybit > 0x8)
			dev->keybit = 0xf;
	}

 out:

	spin_lock(&dev->ctl_submit_lock);

	dev->irq_urb_pending = 0;

	if (likely(!dev->shutdown)) {

		if (dev->buzzer_state)
			dev->ctl_data->byte[HID_OR0] |= BUZZER_ON;
		else
			dev->ctl_data->byte[HID_OR0] &= ~BUZZER_ON;

		dev->ctl_data->byte[HID_OR1] = dev->keybit;
		dev->ctl_data->byte[HID_OR2] = dev->keybit;

		dev->buzzer_pending = 0;
		dev->ctl_urb_pending = 1;

		error = usb_submit_urb(dev->urb_ctl, GFP_ATOMIC);
		if (error)
			err("%s: usb_submit_urb (urb_ctl) failed %d",
				__func__, error);
	}

	spin_unlock(&dev->ctl_submit_lock);
}

static void cm109_urb_ctl_callback(struct urb *urb)
{
	struct cm109_dev *dev = urb->context;
	const int status = urb->status;
	int error;

	dev_dbg(&urb->dev->dev, "### URB CTL: [0x%02x 0x%02x 0x%02x 0x%02x]\n",
	     dev->ctl_data->byte[0],
	     dev->ctl_data->byte[1],
	     dev->ctl_data->byte[2],
	     dev->ctl_data->byte[3]);

	if (status)
		err("%s: urb status %d", __func__, status);

	spin_lock(&dev->ctl_submit_lock);

	dev->ctl_urb_pending = 0;

	if (likely(!dev->shutdown)) {

		if (dev->buzzer_pending) {
			dev->buzzer_pending = 0;
			dev->ctl_urb_pending = 1;
			cm109_submit_buzz_toggle(dev);
		} else if (likely(!dev->irq_urb_pending)) {
			/* ask for key data */
			dev->irq_urb_pending = 1;
			error = usb_submit_urb(dev->urb_irq, GFP_ATOMIC);
			if (error)
				err("%s: usb_submit_urb (urb_irq) failed %d",
					__func__, error);
		}
	}

	spin_unlock(&dev->ctl_submit_lock);
}

static void cm109_toggle_buzzer_async(struct cm109_dev *dev)
{
	unsigned long flags;

	spin_lock_irqsave(&dev->ctl_submit_lock, flags);

	if (dev->ctl_urb_pending) {
		/* URB completion will resubmit */
		dev->buzzer_pending = 1;
	} else {
		dev->ctl_urb_pending = 1;
		cm109_submit_buzz_toggle(dev);
	}

	spin_unlock_irqrestore(&dev->ctl_submit_lock, flags);
}

static void cm109_toggle_buzzer_sync(struct cm109_dev *dev, int on)
{
	int error;

	if (on)
		dev->ctl_data->byte[HID_OR0] |= BUZZER_ON;
	else
		dev->ctl_data->byte[HID_OR0] &= ~BUZZER_ON;

	error = usb_control_msg(dev->udev,
				usb_sndctrlpipe(dev->udev, 0),
				dev->ctl_req->bRequest,
				dev->ctl_req->bRequestType,
				le16_to_cpu(dev->ctl_req->wValue),
				le16_to_cpu(dev->ctl_req->wIndex),
				dev->ctl_data,
				USB_PKT_LEN, USB_CTRL_SET_TIMEOUT);
	if (error && error != EINTR)
		err("%s: usb_control_msg() failed %d", __func__, error);
}

static void cm109_stop_traffic(struct cm109_dev *dev)
{
	dev->shutdown = 1;
	/*
	 * Make sure other CPUs see this
	 */
	smp_wmb();

	usb_kill_urb(dev->urb_ctl);
	usb_kill_urb(dev->urb_irq);

	cm109_toggle_buzzer_sync(dev, 0);

	dev->shutdown = 0;
	smp_wmb();
}

static void cm109_restore_state(struct cm109_dev *dev)
{
	if (dev->open) {
		/*
		 * Restore buzzer state.
		 * This will also kick regular URB submission
		 */
		cm109_toggle_buzzer_async(dev);
	}
}

/******************************************************************************
 * input event interface
 *****************************************************************************/

static int cm109_input_open(struct input_dev *idev)
{
	struct cm109_dev *dev = input_get_drvdata(idev);
	int error;

	error = usb_autopm_get_interface(dev->intf);
	if (error < 0) {
		err("%s - cannot autoresume, result %d",
		    __func__, error);
		return error;
	}

	mutex_lock(&dev->pm_mutex);

	dev->buzzer_state = 0;
	dev->key_code = -1;	/* no keys pressed */
	dev->keybit = 0xf;

	/* issue INIT */
	dev->ctl_data->byte[HID_OR0] = HID_OR_GPO_BUZ_SPDIF;
	dev->ctl_data->byte[HID_OR1] = dev->keybit;
	dev->ctl_data->byte[HID_OR2] = dev->keybit;
	dev->ctl_data->byte[HID_OR3] = 0x00;

	error = usb_submit_urb(dev->urb_ctl, GFP_KERNEL);
	if (error)
		err("%s: usb_submit_urb (urb_ctl) failed %d", __func__, error);
	else
		dev->open = 1;

	mutex_unlock(&dev->pm_mutex);

	if (error)
		usb_autopm_put_interface(dev->intf);

	return error;
}

static void cm109_input_close(struct input_dev *idev)
{
	struct cm109_dev *dev = input_get_drvdata(idev);

	mutex_lock(&dev->pm_mutex);

	/*
	 * Once we are here event delivery is stopped so we
	 * don't need to worry about someone starting buzzer
	 * again
	 */
	cm109_stop_traffic(dev);
	dev->open = 0;

	mutex_unlock(&dev->pm_mutex);

	usb_autopm_put_interface(dev->intf);
}

static int cm109_input_ev(struct input_dev *idev, unsigned int type,
			  unsigned int code, int value)
{
	struct cm109_dev *dev = input_get_drvdata(idev);

	dev_dbg(&dev->udev->dev,
		"input_ev: type=%u code=%u value=%d\n", type, code, value);

	if (type != EV_SND)
		return -EINVAL;

	switch (code) {
	case SND_TONE:
	case SND_BELL:
		dev->buzzer_state = !!value;
		if (!dev->resetting)
			cm109_toggle_buzzer_async(dev);
		return 0;

	default:
		return -EINVAL;
	}
}


/******************************************************************************
 * Linux interface and usb initialisation
 *****************************************************************************/

struct driver_info {
	char *name;
};

static const struct driver_info info_cm109 = {
	.name = "CM109 USB driver",
};

enum {
	VENDOR_ID        = 0x0d8c, /* C-Media Electronics */
	PRODUCT_ID_CM109 = 0x000e, /* CM109 defines range 0x0008 - 0x000f */
};

/* table of devices that work with this driver */
static const struct usb_device_id cm109_usb_table[] = {
	{
		.match_flags = USB_DEVICE_ID_MATCH_DEVICE |
				USB_DEVICE_ID_MATCH_INT_INFO,
		.idVendor = VENDOR_ID,
		.idProduct = PRODUCT_ID_CM109,
		.bInterfaceClass = USB_CLASS_HID,
		.bInterfaceSubClass = 0,
		.bInterfaceProtocol = 0,
		.driver_info = (kernel_ulong_t) &info_cm109
	},
	/* you can add more devices here with product ID 0x0008 - 0x000f */
	{ }
};

static void cm109_usb_cleanup(struct cm109_dev *dev)
{
	kfree(dev->ctl_req);
	if (dev->ctl_data)
		usb_free_coherent(dev->udev, USB_PKT_LEN,
				  dev->ctl_data, dev->ctl_dma);
	if (dev->irq_data)
		usb_free_coherent(dev->udev, USB_PKT_LEN,
				  dev->irq_data, dev->irq_dma);

	usb_free_urb(dev->urb_irq);	/* parameter validation in core/urb */
	usb_free_urb(dev->urb_ctl);	/* parameter validation in core/urb */
	kfree(dev);
}

static void cm109_usb_disconnect(struct usb_interface *interface)
{
	struct cm109_dev *dev = usb_get_intfdata(interface);

	usb_set_intfdata(interface, NULL);
	input_unregister_device(dev->idev);
	cm109_usb_cleanup(dev);
}

static int cm109_usb_probe(struct usb_interface *intf,
			   const struct usb_device_id *id)
{
	struct usb_device *udev = interface_to_usbdev(intf);
	struct driver_info *nfo = (struct driver_info *)id->driver_info;
	struct usb_host_interface *interface;
	struct usb_endpoint_descriptor *endpoint;
	struct cm109_dev *dev;
	struct input_dev *input_dev = NULL;
	int ret, pipe, i;
	int error = -ENOMEM;

	interface = intf->cur_altsetting;
	endpoint = &interface->endpoint[0].desc;

	if (!usb_endpoint_is_int_in(endpoint))
		return -ENODEV;

	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (!dev)
		return -ENOMEM;

	spin_lock_init(&dev->ctl_submit_lock);
	mutex_init(&dev->pm_mutex);

	dev->udev = udev;
	dev->intf = intf;

	dev->idev = input_dev = input_allocate_device();
	if (!input_dev)
		goto err_out;

	/* allocate usb buffers */
	dev->irq_data = usb_alloc_coherent(udev, USB_PKT_LEN,
					   GFP_KERNEL, &dev->irq_dma);
	if (!dev->irq_data)
		goto err_out;

	dev->ctl_data = usb_alloc_coherent(udev, USB_PKT_LEN,
					   GFP_KERNEL, &dev->ctl_dma);
	if (!dev->ctl_data)
		goto err_out;

	dev->ctl_req = kmalloc(sizeof(*(dev->ctl_req)), GFP_KERNEL);
	if (!dev->ctl_req)
		goto err_out;

	/* allocate urb structures */
	dev->urb_irq = usb_alloc_urb(0, GFP_KERNEL);
	if (!dev->urb_irq)
		goto err_out;

	dev->urb_ctl = usb_alloc_urb(0, GFP_KERNEL);
	if (!dev->urb_ctl)
		goto err_out;

	/* get a handle to the interrupt data pipe */
	pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
	ret = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
	if (ret != USB_PKT_LEN)
		err("invalid payload size %d, expected %d", ret, USB_PKT_LEN);

	/* initialise irq urb */
	usb_fill_int_urb(dev->urb_irq, udev, pipe, dev->irq_data,
			 USB_PKT_LEN,
			 cm109_urb_irq_callback, dev, endpoint->bInterval);
	dev->urb_irq->transfer_dma = dev->irq_dma;
	dev->urb_irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
	dev->urb_irq->dev = udev;

	/* initialise ctl urb */
	dev->ctl_req->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE |
					USB_DIR_OUT;
	dev->ctl_req->bRequest = USB_REQ_SET_CONFIGURATION;
	dev->ctl_req->wValue = cpu_to_le16(0x200);
	dev->ctl_req->wIndex = cpu_to_le16(interface->desc.bInterfaceNumber);
	dev->ctl_req->wLength = cpu_to_le16(USB_PKT_LEN);

	usb_fill_control_urb(dev->urb_ctl, udev, usb_sndctrlpipe(udev, 0),
			     (void *)dev->ctl_req, dev->ctl_data, USB_PKT_LEN,
			     cm109_urb_ctl_callback, dev);
	dev->urb_ctl->transfer_dma = dev->ctl_dma;
	dev->urb_ctl->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
	dev->urb_ctl->dev = udev;

	/* find out the physical bus location */
	usb_make_path(udev, dev->phys, sizeof(dev->phys));
	strlcat(dev->phys, "/input0", sizeof(dev->phys));

	/* register settings for the input device */
	input_dev->name = nfo->name;
	input_dev->phys = dev->phys;
	usb_to_input_id(udev, &input_dev->id);
	input_dev->dev.parent = &intf->dev;

	input_set_drvdata(input_dev, dev);
	input_dev->open = cm109_input_open;
	input_dev->close = cm109_input_close;
	input_dev->event = cm109_input_ev;

	input_dev->keycode = dev->keymap;
	input_dev->keycodesize = sizeof(unsigned char);
	input_dev->keycodemax = ARRAY_SIZE(dev->keymap);

	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_SND);
	input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);

	/* register available key events */
	for (i = 0; i < KEYMAP_SIZE; i++) {
		unsigned short k = keymap(i);
		dev->keymap[i] = k;
		__set_bit(k, input_dev->keybit);
	}
	__clear_bit(KEY_RESERVED, input_dev->keybit);

	error = input_register_device(dev->idev);
	if (error)
		goto err_out;

	usb_set_intfdata(intf, dev);

	return 0;

 err_out:
	input_free_device(input_dev);
	cm109_usb_cleanup(dev);
	return error;
}

static int cm109_usb_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct cm109_dev *dev = usb_get_intfdata(intf);

	dev_info(&intf->dev, "cm109: usb_suspend (event=%d)\n", message.event);

	mutex_lock(&dev->pm_mutex);
	cm109_stop_traffic(dev);
	mutex_unlock(&dev->pm_mutex);

	return 0;
}

static int cm109_usb_resume(struct usb_interface *intf)
{
	struct cm109_dev *dev = usb_get_intfdata(intf);

	dev_info(&intf->dev, "cm109: usb_resume\n");

	mutex_lock(&dev->pm_mutex);
	cm109_restore_state(dev);
	mutex_unlock(&dev->pm_mutex);

	return 0;
}

static int cm109_usb_pre_reset(struct usb_interface *intf)
{
	struct cm109_dev *dev = usb_get_intfdata(intf);

	mutex_lock(&dev->pm_mutex);

	/*
	 * Make sure input events don't try to toggle buzzer
	 * while we are resetting
	 */
	dev->resetting = 1;
	smp_wmb();

	cm109_stop_traffic(dev);

	return 0;
}

static int cm109_usb_post_reset(struct usb_interface *intf)
{
	struct cm109_dev *dev = usb_get_intfdata(intf);

	dev->resetting = 0;
	smp_wmb();

	cm109_restore_state(dev);

	mutex_unlock(&dev->pm_mutex);

	return 0;
}

static struct usb_driver cm109_driver = {
	.name		= "cm109",
	.probe		= cm109_usb_probe,
	.disconnect	= cm109_usb_disconnect,
	.suspend	= cm109_usb_suspend,
	.resume		= cm109_usb_resume,
	.reset_resume	= cm109_usb_resume,
	.pre_reset	= cm109_usb_pre_reset,
	.post_reset	= cm109_usb_post_reset,
	.id_table	= cm109_usb_table,
	.supports_autosuspend = 1,
};

static int __init cm109_select_keymap(void)
{
	/* Load the phone keymap */
	if (!strcasecmp(phone, "kip1000")) {
		keymap = keymap_kip1000;
		printk(KERN_INFO KBUILD_MODNAME ": "
			"Keymap for Komunikate KIP1000 phone loaded\n");
	} else if (!strcasecmp(phone, "gtalk")) {
		keymap = keymap_gtalk;
		printk(KERN_INFO KBUILD_MODNAME ": "
			"Keymap for Genius G-talk phone loaded\n");
	} else if (!strcasecmp(phone, "usbph01")) {
		keymap = keymap_usbph01;
		printk(KERN_INFO KBUILD_MODNAME ": "
			"Keymap for Allied-Telesis Corega USBPH01 phone loaded\n");
	} else if (!strcasecmp(phone, "atcom")) {
		keymap = keymap_atcom;
		printk(KERN_INFO KBUILD_MODNAME ": "
			"Keymap for ATCom AU-100 phone loaded\n");
	} else {
		printk(KERN_ERR KBUILD_MODNAME ": "
			"Unsupported phone: %s\n", phone);
		return -EINVAL;
	}

	return 0;
}

static int __init cm109_init(void)
{
	int err;

	err = cm109_select_keymap();
	if (err)
		return err;

	err = usb_register(&cm109_driver);
	if (err)
		return err;

	printk(KERN_INFO KBUILD_MODNAME ": "
		DRIVER_DESC ": " DRIVER_VERSION " (C) " DRIVER_AUTHOR "\n");

	return 0;
}

static void __exit cm109_exit(void)
{
	usb_deregister(&cm109_driver);
}

module_init(cm109_init);
module_exit(cm109_exit);

MODULE_DEVICE_TABLE(usb, cm109_usb_table);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");