summaryrefslogtreecommitdiffstats
path: root/drivers/input/rmi4/rmi_f54.c
blob: f5206e2c767ebf3579c2468b2a2956cc4bff3dcc (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
/*
 * Copyright (c) 2012-2015 Synaptics Incorporated
 * Copyright (C) 2016 Zodiac Inflight Innovations
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/rmi.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/videobuf2-v4l2.h>
#include <media/videobuf2-vmalloc.h>
#include "rmi_driver.h"

#define F54_NAME		"rmi4_f54"

/* F54 data offsets */
#define F54_REPORT_DATA_OFFSET  3
#define F54_FIFO_OFFSET         1
#define F54_NUM_TX_OFFSET       1
#define F54_NUM_RX_OFFSET       0

/* F54 commands */
#define F54_GET_REPORT          1
#define F54_FORCE_CAL           2

/* F54 capabilities */
#define F54_CAP_BASELINE	(1 << 2)
#define F54_CAP_IMAGE8		(1 << 3)
#define F54_CAP_IMAGE16		(1 << 6)

/**
 * enum rmi_f54_report_type - RMI4 F54 report types
 *
 * @F54_8BIT_IMAGE:	Normalized 8-Bit Image Report. The capacitance variance
 *			from baseline for each pixel.
 *
 * @F54_16BIT_IMAGE:	Normalized 16-Bit Image Report. The capacitance variance
 *			from baseline for each pixel.
 *
 * @F54_RAW_16BIT_IMAGE:
 *			Raw 16-Bit Image Report. The raw capacitance for each
 *			pixel.
 *
 * @F54_TRUE_BASELINE:	True Baseline Report. The baseline capacitance for each
 *			pixel.
 *
 * @F54_FULL_RAW_CAP:   Full Raw Capacitance Report. The raw capacitance with
 *			low reference set to its minimum value and high
 *			reference set to its maximum value.
 *
 * @F54_FULL_RAW_CAP_RX_OFFSET_REMOVED:
 *			Full Raw Capacitance with Receiver Offset Removed
 *			Report. Set Low reference to its minimum value and high
 *			references to its maximum value, then report the raw
 *			capacitance for each pixel.
 */
enum rmi_f54_report_type {
	F54_REPORT_NONE = 0,
	F54_8BIT_IMAGE = 1,
	F54_16BIT_IMAGE = 2,
	F54_RAW_16BIT_IMAGE = 3,
	F54_TRUE_BASELINE = 9,
	F54_FULL_RAW_CAP = 19,
	F54_FULL_RAW_CAP_RX_OFFSET_REMOVED = 20,
	F54_MAX_REPORT_TYPE,
};

const char *rmi_f54_report_type_names[] = {
	[F54_REPORT_NONE]		= "Unknown",
	[F54_8BIT_IMAGE]		= "Normalized 8-Bit Image",
	[F54_16BIT_IMAGE]		= "Normalized 16-Bit Image",
	[F54_RAW_16BIT_IMAGE]		= "Raw 16-Bit Image",
	[F54_TRUE_BASELINE]		= "True Baseline",
	[F54_FULL_RAW_CAP]		= "Full Raw Capacitance",
	[F54_FULL_RAW_CAP_RX_OFFSET_REMOVED]
					= "Full Raw Capacitance RX Offset Removed",
};

struct rmi_f54_reports {
	int start;
	int size;
};

struct f54_data {
	struct rmi_function *fn;

	u8 num_rx_electrodes;
	u8 num_tx_electrodes;
	u8 capabilities;
	u16 clock_rate;
	u8 family;

	enum rmi_f54_report_type report_type;
	u8 *report_data;
	int report_size;
	struct rmi_f54_reports standard_report[2];

	bool is_busy;
	struct mutex status_mutex;
	struct mutex data_mutex;

	struct workqueue_struct *workqueue;
	struct delayed_work work;
	unsigned long timeout;

	struct completion cmd_done;

	/* V4L2 support */
	struct v4l2_device v4l2;
	struct v4l2_pix_format format;
	struct video_device vdev;
	struct vb2_queue queue;
	struct mutex lock;
	int input;
	enum rmi_f54_report_type inputs[F54_MAX_REPORT_TYPE];
};

/*
 * Basic checks on report_type to ensure we write a valid type
 * to the sensor.
 */
static bool is_f54_report_type_valid(struct f54_data *f54,
				     enum rmi_f54_report_type reptype)
{
	switch (reptype) {
	case F54_8BIT_IMAGE:
		return f54->capabilities & F54_CAP_IMAGE8;
	case F54_16BIT_IMAGE:
	case F54_RAW_16BIT_IMAGE:
		return f54->capabilities & F54_CAP_IMAGE16;
	case F54_TRUE_BASELINE:
		return f54->capabilities & F54_CAP_IMAGE16;
	case F54_FULL_RAW_CAP:
	case F54_FULL_RAW_CAP_RX_OFFSET_REMOVED:
		return true;
	default:
		return false;
	}
}

static enum rmi_f54_report_type rmi_f54_get_reptype(struct f54_data *f54,
						unsigned int i)
{
	if (i >= F54_MAX_REPORT_TYPE)
		return F54_REPORT_NONE;

	return f54->inputs[i];
}

static void rmi_f54_create_input_map(struct f54_data *f54)
{
	int i = 0;
	enum rmi_f54_report_type reptype;

	for (reptype = 1; reptype < F54_MAX_REPORT_TYPE; reptype++) {
		if (!is_f54_report_type_valid(f54, reptype))
			continue;

		f54->inputs[i++] = reptype;
	}

	/* Remaining values are zero via kzalloc */
}

static int rmi_f54_request_report(struct rmi_function *fn, u8 report_type)
{
	struct f54_data *f54 = dev_get_drvdata(&fn->dev);
	struct rmi_device *rmi_dev = fn->rmi_dev;
	int error;

	/* Write Report Type into F54_AD_Data0 */
	if (f54->report_type != report_type) {
		error = rmi_write(rmi_dev, f54->fn->fd.data_base_addr,
				  report_type);
		if (error)
			return error;
		f54->report_type = report_type;
	}

	/*
	 * Small delay after disabling interrupts to avoid race condition
	 * in firmare. This value is a bit higher than absolutely necessary.
	 * Should be removed once issue is resolved in firmware.
	 */
	usleep_range(2000, 3000);

	mutex_lock(&f54->data_mutex);

	error = rmi_write(rmi_dev, fn->fd.command_base_addr, F54_GET_REPORT);
	if (error < 0)
		goto unlock;

	init_completion(&f54->cmd_done);

	f54->is_busy = 1;
	f54->timeout = jiffies + msecs_to_jiffies(100);

	queue_delayed_work(f54->workqueue, &f54->work, 0);

unlock:
	mutex_unlock(&f54->data_mutex);

	return error;
}

static size_t rmi_f54_get_report_size(struct f54_data *f54)
{
	struct rmi_device *rmi_dev = f54->fn->rmi_dev;
	struct rmi_driver_data *drv_data = dev_get_drvdata(&rmi_dev->dev);
	u8 rx = drv_data->num_rx_electrodes ? : f54->num_rx_electrodes;
	u8 tx = drv_data->num_tx_electrodes ? : f54->num_tx_electrodes;
	size_t size;

	switch (rmi_f54_get_reptype(f54, f54->input)) {
	case F54_8BIT_IMAGE:
		size = rx * tx;
		break;
	case F54_16BIT_IMAGE:
	case F54_RAW_16BIT_IMAGE:
	case F54_TRUE_BASELINE:
	case F54_FULL_RAW_CAP:
	case F54_FULL_RAW_CAP_RX_OFFSET_REMOVED:
		size = sizeof(u16) * rx * tx;
		break;
	default:
		size = 0;
	}

	return size;
}

static int rmi_f54_get_pixel_fmt(enum rmi_f54_report_type reptype, u32 *pixfmt)
{
	int ret = 0;

	switch (reptype) {
	case F54_8BIT_IMAGE:
		*pixfmt = V4L2_TCH_FMT_DELTA_TD08;
		break;

	case F54_16BIT_IMAGE:
		*pixfmt = V4L2_TCH_FMT_DELTA_TD16;
		break;

	case F54_RAW_16BIT_IMAGE:
	case F54_TRUE_BASELINE:
	case F54_FULL_RAW_CAP:
	case F54_FULL_RAW_CAP_RX_OFFSET_REMOVED:
		*pixfmt = V4L2_TCH_FMT_TU16;
		break;

	case F54_REPORT_NONE:
	case F54_MAX_REPORT_TYPE:
		ret = -EINVAL;
		break;
	}

	return ret;
}

static const struct v4l2_file_operations rmi_f54_video_fops = {
	.owner = THIS_MODULE,
	.open = v4l2_fh_open,
	.release = vb2_fop_release,
	.unlocked_ioctl = video_ioctl2,
	.read = vb2_fop_read,
	.mmap = vb2_fop_mmap,
	.poll = vb2_fop_poll,
};

static int rmi_f54_queue_setup(struct vb2_queue *q, unsigned int *nbuffers,
			       unsigned int *nplanes, unsigned int sizes[],
			       struct device *alloc_devs[])
{
	struct f54_data *f54 = q->drv_priv;

	if (*nplanes)
		return sizes[0] < rmi_f54_get_report_size(f54) ? -EINVAL : 0;

	*nplanes = 1;
	sizes[0] = rmi_f54_get_report_size(f54);

	return 0;
}

static void rmi_f54_buffer_queue(struct vb2_buffer *vb)
{
	struct f54_data *f54 = vb2_get_drv_priv(vb->vb2_queue);
	u16 *ptr;
	enum vb2_buffer_state state;
	enum rmi_f54_report_type reptype;
	int ret;

	mutex_lock(&f54->status_mutex);

	reptype = rmi_f54_get_reptype(f54, f54->input);
	if (reptype == F54_REPORT_NONE) {
		state = VB2_BUF_STATE_ERROR;
		goto done;
	}

	if (f54->is_busy) {
		state = VB2_BUF_STATE_ERROR;
		goto done;
	}

	ret = rmi_f54_request_report(f54->fn, reptype);
	if (ret) {
		dev_err(&f54->fn->dev, "Error requesting F54 report\n");
		state = VB2_BUF_STATE_ERROR;
		goto done;
	}

	/* get frame data */
	mutex_lock(&f54->data_mutex);

	while (f54->is_busy) {
		mutex_unlock(&f54->data_mutex);
		if (!wait_for_completion_timeout(&f54->cmd_done,
						 msecs_to_jiffies(1000))) {
			dev_err(&f54->fn->dev, "Timed out\n");
			state = VB2_BUF_STATE_ERROR;
			goto done;
		}
		mutex_lock(&f54->data_mutex);
	}

	ptr = vb2_plane_vaddr(vb, 0);
	if (!ptr) {
		dev_err(&f54->fn->dev, "Error acquiring frame ptr\n");
		state = VB2_BUF_STATE_ERROR;
		goto data_done;
	}

	memcpy(ptr, f54->report_data, f54->report_size);
	vb2_set_plane_payload(vb, 0, rmi_f54_get_report_size(f54));
	state = VB2_BUF_STATE_DONE;

data_done:
	mutex_unlock(&f54->data_mutex);
done:
	vb2_buffer_done(vb, state);
	mutex_unlock(&f54->status_mutex);
}

/* V4L2 structures */
static const struct vb2_ops rmi_f54_queue_ops = {
	.queue_setup            = rmi_f54_queue_setup,
	.buf_queue              = rmi_f54_buffer_queue,
	.wait_prepare           = vb2_ops_wait_prepare,
	.wait_finish            = vb2_ops_wait_finish,
};

static const struct vb2_queue rmi_f54_queue = {
	.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
	.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF | VB2_READ,
	.buf_struct_size = sizeof(struct vb2_buffer),
	.ops = &rmi_f54_queue_ops,
	.mem_ops = &vb2_vmalloc_memops,
	.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC,
	.min_buffers_needed = 1,
};

static int rmi_f54_vidioc_querycap(struct file *file, void *priv,
				   struct v4l2_capability *cap)
{
	struct f54_data *f54 = video_drvdata(file);

	strlcpy(cap->driver, F54_NAME, sizeof(cap->driver));
	strlcpy(cap->card, SYNAPTICS_INPUT_DEVICE_NAME, sizeof(cap->card));
	snprintf(cap->bus_info, sizeof(cap->bus_info),
		"rmi4:%s", dev_name(&f54->fn->dev));

	return 0;
}

static int rmi_f54_vidioc_enum_input(struct file *file, void *priv,
				     struct v4l2_input *i)
{
	struct f54_data *f54 = video_drvdata(file);
	enum rmi_f54_report_type reptype;

	reptype = rmi_f54_get_reptype(f54, i->index);
	if (reptype == F54_REPORT_NONE)
		return -EINVAL;

	i->type = V4L2_INPUT_TYPE_TOUCH;

	strlcpy(i->name, rmi_f54_report_type_names[reptype], sizeof(i->name));
	return 0;
}

static int rmi_f54_set_input(struct f54_data *f54, unsigned int i)
{
	struct rmi_device *rmi_dev = f54->fn->rmi_dev;
	struct rmi_driver_data *drv_data = dev_get_drvdata(&rmi_dev->dev);
	u8 rx = drv_data->num_rx_electrodes ? : f54->num_rx_electrodes;
	u8 tx = drv_data->num_tx_electrodes ? : f54->num_tx_electrodes;
	struct v4l2_pix_format *f = &f54->format;
	enum rmi_f54_report_type reptype;
	int ret;

	reptype = rmi_f54_get_reptype(f54, i);
	if (reptype == F54_REPORT_NONE)
		return -EINVAL;

	ret = rmi_f54_get_pixel_fmt(reptype, &f->pixelformat);
	if (ret)
		return ret;

	f54->input = i;

	f->width = rx;
	f->height = tx;
	f->field = V4L2_FIELD_NONE;
	f->colorspace = V4L2_COLORSPACE_RAW;
	f->bytesperline = f->width * sizeof(u16);
	f->sizeimage = f->width * f->height * sizeof(u16);

	return 0;
}

static int rmi_f54_vidioc_s_input(struct file *file, void *priv, unsigned int i)
{
	return rmi_f54_set_input(video_drvdata(file), i);
}

static int rmi_f54_vidioc_g_input(struct file *file, void *priv,
				  unsigned int *i)
{
	struct f54_data *f54 = video_drvdata(file);

	*i = f54->input;

	return 0;
}

static int rmi_f54_vidioc_fmt(struct file *file, void *priv,
			      struct v4l2_format *f)
{
	struct f54_data *f54 = video_drvdata(file);

	f->fmt.pix = f54->format;

	return 0;
}

static int rmi_f54_vidioc_enum_fmt(struct file *file, void *priv,
				   struct v4l2_fmtdesc *fmt)
{
	if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;

	switch (fmt->index) {
	case 0:
		fmt->pixelformat = V4L2_TCH_FMT_DELTA_TD16;
		break;

	case 1:
		fmt->pixelformat = V4L2_TCH_FMT_DELTA_TD08;
		break;

	case 2:
		fmt->pixelformat = V4L2_TCH_FMT_TU16;
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

static int rmi_f54_vidioc_g_parm(struct file *file, void *fh,
				 struct v4l2_streamparm *a)
{
	if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;

	a->parm.capture.readbuffers = 1;
	a->parm.capture.timeperframe.numerator = 1;
	a->parm.capture.timeperframe.denominator = 10;
	return 0;
}

static const struct v4l2_ioctl_ops rmi_f54_video_ioctl_ops = {
	.vidioc_querycap	= rmi_f54_vidioc_querycap,

	.vidioc_enum_fmt_vid_cap = rmi_f54_vidioc_enum_fmt,
	.vidioc_s_fmt_vid_cap	= rmi_f54_vidioc_fmt,
	.vidioc_g_fmt_vid_cap	= rmi_f54_vidioc_fmt,
	.vidioc_try_fmt_vid_cap	= rmi_f54_vidioc_fmt,
	.vidioc_g_parm		= rmi_f54_vidioc_g_parm,

	.vidioc_enum_input	= rmi_f54_vidioc_enum_input,
	.vidioc_g_input		= rmi_f54_vidioc_g_input,
	.vidioc_s_input		= rmi_f54_vidioc_s_input,

	.vidioc_reqbufs		= vb2_ioctl_reqbufs,
	.vidioc_create_bufs	= vb2_ioctl_create_bufs,
	.vidioc_querybuf	= vb2_ioctl_querybuf,
	.vidioc_qbuf		= vb2_ioctl_qbuf,
	.vidioc_dqbuf		= vb2_ioctl_dqbuf,
	.vidioc_expbuf		= vb2_ioctl_expbuf,

	.vidioc_streamon	= vb2_ioctl_streamon,
	.vidioc_streamoff	= vb2_ioctl_streamoff,
};

static const struct video_device rmi_f54_video_device = {
	.name = "Synaptics RMI4",
	.fops = &rmi_f54_video_fops,
	.ioctl_ops = &rmi_f54_video_ioctl_ops,
	.release = video_device_release_empty,
	.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TOUCH |
		       V4L2_CAP_READWRITE | V4L2_CAP_STREAMING,
};

static void rmi_f54_work(struct work_struct *work)
{
	struct f54_data *f54 = container_of(work, struct f54_data, work.work);
	struct rmi_function *fn = f54->fn;
	u8 fifo[2];
	struct rmi_f54_reports *report;
	int report_size;
	u8 command;
	u8 *data;
	int error;

	data = f54->report_data;
	report_size = rmi_f54_get_report_size(f54);
	if (report_size == 0) {
		dev_err(&fn->dev, "Bad report size, report type=%d\n",
				f54->report_type);
		error = -EINVAL;
		goto error;     /* retry won't help */
	}
	f54->standard_report[0].size = report_size;
	report = f54->standard_report;

	mutex_lock(&f54->data_mutex);

	/*
	 * Need to check if command has completed.
	 * If not try again later.
	 */
	error = rmi_read(fn->rmi_dev, f54->fn->fd.command_base_addr,
			 &command);
	if (error) {
		dev_err(&fn->dev, "Failed to read back command\n");
		goto error;
	}
	if (command & F54_GET_REPORT) {
		if (time_after(jiffies, f54->timeout)) {
			dev_err(&fn->dev, "Get report command timed out\n");
			error = -ETIMEDOUT;
		}
		report_size = 0;
		goto error;
	}

	rmi_dbg(RMI_DEBUG_FN, &fn->dev, "Get report command completed, reading data\n");

	report_size = 0;
	for (; report->size; report++) {
		fifo[0] = report->start & 0xff;
		fifo[1] = (report->start >> 8) & 0xff;
		error = rmi_write_block(fn->rmi_dev,
					fn->fd.data_base_addr + F54_FIFO_OFFSET,
					fifo, sizeof(fifo));
		if (error) {
			dev_err(&fn->dev, "Failed to set fifo start offset\n");
			goto abort;
		}

		error = rmi_read_block(fn->rmi_dev, fn->fd.data_base_addr +
				       F54_REPORT_DATA_OFFSET, data,
				       report->size);
		if (error) {
			dev_err(&fn->dev, "%s: read [%d bytes] returned %d\n",
				__func__, report->size, error);
			goto abort;
		}
		data += report->size;
		report_size += report->size;
	}

abort:
	f54->report_size = error ? 0 : report_size;
error:
	if (error)
		report_size = 0;

	if (report_size == 0 && !error) {
		queue_delayed_work(f54->workqueue, &f54->work,
				   msecs_to_jiffies(1));
	} else {
		f54->is_busy = false;
		complete(&f54->cmd_done);
	}

	mutex_unlock(&f54->data_mutex);
}

static int rmi_f54_attention(struct rmi_function *fn, unsigned long *irqbits)
{
	return 0;
}

static int rmi_f54_config(struct rmi_function *fn)
{
	struct rmi_driver *drv = fn->rmi_dev->driver;

	drv->set_irq_bits(fn->rmi_dev, fn->irq_mask);

	return 0;
}

static int rmi_f54_detect(struct rmi_function *fn)
{
	int error;
	struct f54_data *f54;
	u8 buf[6];

	f54 = dev_get_drvdata(&fn->dev);

	error = rmi_read_block(fn->rmi_dev, fn->fd.query_base_addr,
			       buf, sizeof(buf));
	if (error) {
		dev_err(&fn->dev, "%s: Failed to query F54 properties\n",
			__func__);
		return error;
	}

	f54->num_rx_electrodes = buf[0];
	f54->num_tx_electrodes = buf[1];
	f54->capabilities = buf[2];
	f54->clock_rate = buf[3] | (buf[4] << 8);
	f54->family = buf[5];

	rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 num_rx_electrodes: %d\n",
		f54->num_rx_electrodes);
	rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 num_tx_electrodes: %d\n",
		f54->num_tx_electrodes);
	rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 capabilities: 0x%x\n",
		f54->capabilities);
	rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 clock rate: 0x%x\n",
		f54->clock_rate);
	rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 family: 0x%x\n",
		f54->family);

	f54->is_busy = false;

	return 0;
}

static int rmi_f54_probe(struct rmi_function *fn)
{
	struct f54_data *f54;
	int ret;
	u8 rx, tx;

	f54 = devm_kzalloc(&fn->dev, sizeof(struct f54_data), GFP_KERNEL);
	if (!f54)
		return -ENOMEM;

	f54->fn = fn;
	dev_set_drvdata(&fn->dev, f54);

	ret = rmi_f54_detect(fn);
	if (ret)
		return ret;

	mutex_init(&f54->data_mutex);
	mutex_init(&f54->status_mutex);

	rx = f54->num_rx_electrodes;
	tx = f54->num_tx_electrodes;
	f54->report_data = devm_kzalloc(&fn->dev,
					sizeof(u16) * tx * rx,
					GFP_KERNEL);
	if (f54->report_data == NULL)
		return -ENOMEM;

	INIT_DELAYED_WORK(&f54->work, rmi_f54_work);

	f54->workqueue = create_singlethread_workqueue("rmi4-poller");
	if (!f54->workqueue)
		return -ENOMEM;

	rmi_f54_create_input_map(f54);

	/* register video device */
	strlcpy(f54->v4l2.name, F54_NAME, sizeof(f54->v4l2.name));
	ret = v4l2_device_register(&fn->dev, &f54->v4l2);
	if (ret) {
		dev_err(&fn->dev, "Unable to register video dev.\n");
		goto remove_wq;
	}

	/* initialize the queue */
	mutex_init(&f54->lock);
	f54->queue = rmi_f54_queue;
	f54->queue.drv_priv = f54;
	f54->queue.lock = &f54->lock;
	f54->queue.dev = &fn->dev;

	ret = vb2_queue_init(&f54->queue);
	if (ret)
		goto remove_v4l2;

	f54->vdev = rmi_f54_video_device;
	f54->vdev.v4l2_dev = &f54->v4l2;
	f54->vdev.lock = &f54->lock;
	f54->vdev.vfl_dir = VFL_DIR_RX;
	f54->vdev.queue = &f54->queue;
	video_set_drvdata(&f54->vdev, f54);

	ret = video_register_device(&f54->vdev, VFL_TYPE_TOUCH, -1);
	if (ret) {
		dev_err(&fn->dev, "Unable to register video subdevice.");
		goto remove_v4l2;
	}

	return 0;

remove_v4l2:
	v4l2_device_unregister(&f54->v4l2);
remove_wq:
	cancel_delayed_work_sync(&f54->work);
	flush_workqueue(f54->workqueue);
	destroy_workqueue(f54->workqueue);
	return ret;
}

static void rmi_f54_remove(struct rmi_function *fn)
{
	struct f54_data *f54 = dev_get_drvdata(&fn->dev);

	video_unregister_device(&f54->vdev);
	v4l2_device_unregister(&f54->v4l2);
}

struct rmi_function_handler rmi_f54_handler = {
	.driver = {
		.name = F54_NAME,
	},
	.func = 0x54,
	.probe = rmi_f54_probe,
	.config = rmi_f54_config,
	.attention = rmi_f54_attention,
	.remove = rmi_f54_remove,
};