rmi_f54.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (c) 2012-2015 Synaptics Incorporated
  4 * Copyright (C) 2016 Zodiac Inflight Innovations
  5 */
  6
  7#include <linux/kernel.h>
  8#include <linux/rmi.h>
  9#include <linux/input.h>
 10#include <linux/slab.h>
 11#include <linux/delay.h>
 12#include <linux/i2c.h>
 13#include <media/v4l2-device.h>
 14#include <media/v4l2-ioctl.h>
 15#include <media/videobuf2-v4l2.h>
 16#include <media/videobuf2-vmalloc.h>
 17#include "rmi_driver.h"
 18
 19#define F54_NAME		"rmi4_f54"
 20
 21/* F54 data offsets */
 22#define F54_REPORT_DATA_OFFSET  3
 23#define F54_FIFO_OFFSET         1
 24#define F54_NUM_TX_OFFSET       1
 25#define F54_NUM_RX_OFFSET       0
 26
 27/*
 28 * The smbus protocol can read only 32 bytes max at a time.
 29 * But this should be fine for i2c/spi as well.
 30 */
 31#define F54_REPORT_DATA_SIZE	32
 32
 33/* F54 commands */
 34#define F54_GET_REPORT          1
 35#define F54_FORCE_CAL           2
 36
 37/* F54 capabilities */
 38#define F54_CAP_BASELINE	(1 << 2)
 39#define F54_CAP_IMAGE8		(1 << 3)
 40#define F54_CAP_IMAGE16		(1 << 6)
 41
 42/**
 43 * enum rmi_f54_report_type - RMI4 F54 report types
 44 *
 45 * @F54_REPORT_NONE:	No Image Report.
 46 *
 47 * @F54_8BIT_IMAGE:	Normalized 8-Bit Image Report. The capacitance variance
 48 *			from baseline for each pixel.
 49 *
 50 * @F54_16BIT_IMAGE:	Normalized 16-Bit Image Report. The capacitance variance
 51 *			from baseline for each pixel.
 52 *
 53 * @F54_RAW_16BIT_IMAGE:
 54 *			Raw 16-Bit Image Report. The raw capacitance for each
 55 *			pixel.
 56 *
 57 * @F54_TRUE_BASELINE:	True Baseline Report. The baseline capacitance for each
 58 *			pixel.
 59 *
 60 * @F54_FULL_RAW_CAP:   Full Raw Capacitance Report. The raw capacitance with
 61 *			low reference set to its minimum value and high
 62 *			reference set to its maximum value.
 63 *
 64 * @F54_FULL_RAW_CAP_RX_OFFSET_REMOVED:
 65 *			Full Raw Capacitance with Receiver Offset Removed
 66 *			Report. Set Low reference to its minimum value and high
 67 *			references to its maximum value, then report the raw
 68 *			capacitance for each pixel.
 69 *
 70 * @F54_MAX_REPORT_TYPE:
 71 *			Maximum number of Report Types.  Used for sanity
 72 *			checking.
 73 */
 74enum rmi_f54_report_type {
 75	F54_REPORT_NONE = 0,
 76	F54_8BIT_IMAGE = 1,
 77	F54_16BIT_IMAGE = 2,
 78	F54_RAW_16BIT_IMAGE = 3,
 79	F54_TRUE_BASELINE = 9,
 80	F54_FULL_RAW_CAP = 19,
 81	F54_FULL_RAW_CAP_RX_OFFSET_REMOVED = 20,
 82	F54_MAX_REPORT_TYPE,
 83};
 84
 85static const char * const rmi_f54_report_type_names[] = {
 86	[F54_REPORT_NONE]		= "Unknown",
 87	[F54_8BIT_IMAGE]		= "Normalized 8-Bit Image",
 88	[F54_16BIT_IMAGE]		= "Normalized 16-Bit Image",
 89	[F54_RAW_16BIT_IMAGE]		= "Raw 16-Bit Image",
 90	[F54_TRUE_BASELINE]		= "True Baseline",
 91	[F54_FULL_RAW_CAP]		= "Full Raw Capacitance",
 92	[F54_FULL_RAW_CAP_RX_OFFSET_REMOVED]
 93					= "Full Raw Capacitance RX Offset Removed",
 94};
 95
 96struct f54_data {
 97	struct rmi_function *fn;
 98
 99	u8 num_rx_electrodes;
100	u8 num_tx_electrodes;
101	u8 capabilities;
102	u16 clock_rate;
103	u8 family;
104
105	enum rmi_f54_report_type report_type;
106	u8 *report_data;
107	int report_size;
108
109	bool is_busy;
110	struct mutex status_mutex;
111	struct mutex data_mutex;
112
113	struct workqueue_struct *workqueue;
114	struct delayed_work work;
115	unsigned long timeout;
116
117	struct completion cmd_done;
118
119	/* V4L2 support */
120	struct v4l2_device v4l2;
121	struct v4l2_pix_format format;
122	struct video_device vdev;
123	struct vb2_queue queue;
124	struct mutex lock;
125	u32 sequence;
126	int input;
127	enum rmi_f54_report_type inputs[F54_MAX_REPORT_TYPE];
128};
129
130/*
131 * Basic checks on report_type to ensure we write a valid type
132 * to the sensor.
133 */
134static bool is_f54_report_type_valid(struct f54_data *f54,
135				     enum rmi_f54_report_type reptype)
136{
137	switch (reptype) {
138	case F54_8BIT_IMAGE:
139		return f54->capabilities & F54_CAP_IMAGE8;
140	case F54_16BIT_IMAGE:
141	case F54_RAW_16BIT_IMAGE:
142		return f54->capabilities & F54_CAP_IMAGE16;
143	case F54_TRUE_BASELINE:
144		return f54->capabilities & F54_CAP_IMAGE16;
145	case F54_FULL_RAW_CAP:
146	case F54_FULL_RAW_CAP_RX_OFFSET_REMOVED:
147		return true;
148	default:
149		return false;
150	}
151}
152
153static enum rmi_f54_report_type rmi_f54_get_reptype(struct f54_data *f54,
154						unsigned int i)
155{
156	if (i >= F54_MAX_REPORT_TYPE)
157		return F54_REPORT_NONE;
158
159	return f54->inputs[i];
160}
161
162static void rmi_f54_create_input_map(struct f54_data *f54)
163{
164	int i = 0;
165	enum rmi_f54_report_type reptype;
166
167	for (reptype = 1; reptype < F54_MAX_REPORT_TYPE; reptype++) {
168		if (!is_f54_report_type_valid(f54, reptype))
169			continue;
170
171		f54->inputs[i++] = reptype;
172	}
173
174	/* Remaining values are zero via kzalloc */
175}
176
177static int rmi_f54_request_report(struct rmi_function *fn, u8 report_type)
178{
179	struct f54_data *f54 = dev_get_drvdata(&fn->dev);
180	struct rmi_device *rmi_dev = fn->rmi_dev;
181	int error;
182
183	/* Write Report Type into F54_AD_Data0 */
184	if (f54->report_type != report_type) {
185		error = rmi_write(rmi_dev, f54->fn->fd.data_base_addr,
186				  report_type);
187		if (error)
188			return error;
189		f54->report_type = report_type;
190	}
191
192	/*
193	 * Small delay after disabling interrupts to avoid race condition
194	 * in firmare. This value is a bit higher than absolutely necessary.
195	 * Should be removed once issue is resolved in firmware.
196	 */
197	usleep_range(2000, 3000);
198
199	mutex_lock(&f54->data_mutex);
200
201	error = rmi_write(rmi_dev, fn->fd.command_base_addr, F54_GET_REPORT);
202	if (error < 0)
203		goto unlock;
204
205	init_completion(&f54->cmd_done);
206
207	f54->is_busy = 1;
208	f54->timeout = jiffies + msecs_to_jiffies(100);
209
210	queue_delayed_work(f54->workqueue, &f54->work, 0);
211
212unlock:
213	mutex_unlock(&f54->data_mutex);
214
215	return error;
216}
217
218static size_t rmi_f54_get_report_size(struct f54_data *f54)
219{
220	struct rmi_device *rmi_dev = f54->fn->rmi_dev;
221	struct rmi_driver_data *drv_data = dev_get_drvdata(&rmi_dev->dev);
222	u8 rx = drv_data->num_rx_electrodes ? : f54->num_rx_electrodes;
223	u8 tx = drv_data->num_tx_electrodes ? : f54->num_tx_electrodes;
224	size_t size;
225
226	switch (rmi_f54_get_reptype(f54, f54->input)) {
227	case F54_8BIT_IMAGE:
228		size = rx * tx;
229		break;
230	case F54_16BIT_IMAGE:
231	case F54_RAW_16BIT_IMAGE:
232	case F54_TRUE_BASELINE:
233	case F54_FULL_RAW_CAP:
234	case F54_FULL_RAW_CAP_RX_OFFSET_REMOVED:
235		size = sizeof(u16) * rx * tx;
236		break;
237	default:
238		size = 0;
239	}
240
241	return size;
242}
243
244static int rmi_f54_get_pixel_fmt(enum rmi_f54_report_type reptype, u32 *pixfmt)
245{
246	int ret = 0;
247
248	switch (reptype) {
249	case F54_8BIT_IMAGE:
250		*pixfmt = V4L2_TCH_FMT_DELTA_TD08;
251		break;
252
253	case F54_16BIT_IMAGE:
254		*pixfmt = V4L2_TCH_FMT_DELTA_TD16;
255		break;
256
257	case F54_RAW_16BIT_IMAGE:
258	case F54_TRUE_BASELINE:
259	case F54_FULL_RAW_CAP:
260	case F54_FULL_RAW_CAP_RX_OFFSET_REMOVED:
261		*pixfmt = V4L2_TCH_FMT_TU16;
262		break;
263
264	case F54_REPORT_NONE:
265	case F54_MAX_REPORT_TYPE:
266		ret = -EINVAL;
267		break;
268	}
269
270	return ret;
271}
272
273static const struct v4l2_file_operations rmi_f54_video_fops = {
274	.owner = THIS_MODULE,
275	.open = v4l2_fh_open,
276	.release = vb2_fop_release,
277	.unlocked_ioctl = video_ioctl2,
278	.read = vb2_fop_read,
279	.mmap = vb2_fop_mmap,
280	.poll = vb2_fop_poll,
281};
282
283static int rmi_f54_queue_setup(struct vb2_queue *q, unsigned int *nbuffers,
284			       unsigned int *nplanes, unsigned int sizes[],
285			       struct device *alloc_devs[])
286{
287	struct f54_data *f54 = q->drv_priv;
288
289	if (*nplanes)
290		return sizes[0] < rmi_f54_get_report_size(f54) ? -EINVAL : 0;
291
292	*nplanes = 1;
293	sizes[0] = rmi_f54_get_report_size(f54);
294
295	return 0;
296}
297
298static void rmi_f54_buffer_queue(struct vb2_buffer *vb)
299{
300	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
301	struct f54_data *f54 = vb2_get_drv_priv(vb->vb2_queue);
302	u16 *ptr;
303	enum vb2_buffer_state state;
304	enum rmi_f54_report_type reptype;
305	int ret;
306
307	mutex_lock(&f54->status_mutex);
308
309	vb2_set_plane_payload(vb, 0, 0);
310	reptype = rmi_f54_get_reptype(f54, f54->input);
311	if (reptype == F54_REPORT_NONE) {
312		state = VB2_BUF_STATE_ERROR;
313		goto done;
314	}
315
316	if (f54->is_busy) {
317		state = VB2_BUF_STATE_ERROR;
318		goto done;
319	}
320
321	ret = rmi_f54_request_report(f54->fn, reptype);
322	if (ret) {
323		dev_err(&f54->fn->dev, "Error requesting F54 report\n");
324		state = VB2_BUF_STATE_ERROR;
325		goto done;
326	}
327
328	/* get frame data */
329	mutex_lock(&f54->data_mutex);
330
331	while (f54->is_busy) {
332		mutex_unlock(&f54->data_mutex);
333		if (!wait_for_completion_timeout(&f54->cmd_done,
334						 msecs_to_jiffies(1000))) {
335			dev_err(&f54->fn->dev, "Timed out\n");
336			state = VB2_BUF_STATE_ERROR;
337			goto done;
338		}
339		mutex_lock(&f54->data_mutex);
340	}
341
342	ptr = vb2_plane_vaddr(vb, 0);
343	if (!ptr) {
344		dev_err(&f54->fn->dev, "Error acquiring frame ptr\n");
345		state = VB2_BUF_STATE_ERROR;
346		goto data_done;
347	}
348
349	memcpy(ptr, f54->report_data, f54->report_size);
350	vb2_set_plane_payload(vb, 0, rmi_f54_get_report_size(f54));
351	state = VB2_BUF_STATE_DONE;
352
353data_done:
354	mutex_unlock(&f54->data_mutex);
355done:
356	vb->timestamp = ktime_get_ns();
357	vbuf->field = V4L2_FIELD_NONE;
358	vbuf->sequence = f54->sequence++;
359	vb2_buffer_done(vb, state);
360	mutex_unlock(&f54->status_mutex);
361}
362
363static void rmi_f54_stop_streaming(struct vb2_queue *q)
364{
365	struct f54_data *f54 = vb2_get_drv_priv(q);
366
367	f54->sequence = 0;
368}
369
370/* V4L2 structures */
371static const struct vb2_ops rmi_f54_queue_ops = {
372	.queue_setup            = rmi_f54_queue_setup,
373	.buf_queue              = rmi_f54_buffer_queue,
374	.stop_streaming		= rmi_f54_stop_streaming,
375};
376
377static const struct vb2_queue rmi_f54_queue = {
378	.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
379	.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF | VB2_READ,
380	.buf_struct_size = sizeof(struct vb2_v4l2_buffer),
381	.ops = &rmi_f54_queue_ops,
382	.mem_ops = &vb2_vmalloc_memops,
383	.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC,
384};
385
386static int rmi_f54_vidioc_querycap(struct file *file, void *priv,
387				   struct v4l2_capability *cap)
388{
389	struct f54_data *f54 = video_drvdata(file);
390
391	strscpy(cap->driver, F54_NAME, sizeof(cap->driver));
392	strscpy(cap->card, SYNAPTICS_INPUT_DEVICE_NAME, sizeof(cap->card));
393	snprintf(cap->bus_info, sizeof(cap->bus_info),
394		"rmi4:%s", dev_name(&f54->fn->dev));
395
396	return 0;
397}
398
399static int rmi_f54_vidioc_enum_input(struct file *file, void *priv,
400				     struct v4l2_input *i)
401{
402	struct f54_data *f54 = video_drvdata(file);
403	enum rmi_f54_report_type reptype;
404
405	reptype = rmi_f54_get_reptype(f54, i->index);
406	if (reptype == F54_REPORT_NONE)
407		return -EINVAL;
408
409	i->type = V4L2_INPUT_TYPE_TOUCH;
410
411	strscpy(i->name, rmi_f54_report_type_names[reptype], sizeof(i->name));
412	return 0;
413}
414
415static int rmi_f54_set_input(struct f54_data *f54, unsigned int i)
416{
417	struct rmi_device *rmi_dev = f54->fn->rmi_dev;
418	struct rmi_driver_data *drv_data = dev_get_drvdata(&rmi_dev->dev);
419	u8 rx = drv_data->num_rx_electrodes ? : f54->num_rx_electrodes;
420	u8 tx = drv_data->num_tx_electrodes ? : f54->num_tx_electrodes;
421	struct v4l2_pix_format *f = &f54->format;
422	enum rmi_f54_report_type reptype;
423	int ret;
424
425	reptype = rmi_f54_get_reptype(f54, i);
426	if (reptype == F54_REPORT_NONE)
427		return -EINVAL;
428
429	ret = rmi_f54_get_pixel_fmt(reptype, &f->pixelformat);
430	if (ret)
431		return ret;
432
433	f54->input = i;
434
435	f->width = rx;
436	f->height = tx;
437	f->field = V4L2_FIELD_NONE;
438	f->colorspace = V4L2_COLORSPACE_RAW;
439	f->bytesperline = f->width * sizeof(u16);
440	f->sizeimage = f->width * f->height * sizeof(u16);
441
442	return 0;
443}
444
445static int rmi_f54_vidioc_s_input(struct file *file, void *priv, unsigned int i)
446{
447	return rmi_f54_set_input(video_drvdata(file), i);
448}
449
450static int rmi_f54_vidioc_g_input(struct file *file, void *priv,
451				  unsigned int *i)
452{
453	struct f54_data *f54 = video_drvdata(file);
454
455	*i = f54->input;
456
457	return 0;
458}
459
460static int rmi_f54_vidioc_fmt(struct file *file, void *priv,
461			      struct v4l2_format *f)
462{
463	struct f54_data *f54 = video_drvdata(file);
464
465	f->fmt.pix = f54->format;
466
467	return 0;
468}
469
470static int rmi_f54_vidioc_enum_fmt(struct file *file, void *priv,
471				   struct v4l2_fmtdesc *fmt)
472{
473	struct f54_data *f54 = video_drvdata(file);
474
475	if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
476		return -EINVAL;
477
478	if (fmt->index)
479		return -EINVAL;
480
481	fmt->pixelformat = f54->format.pixelformat;
482
483	return 0;
484}
485
486static int rmi_f54_vidioc_g_parm(struct file *file, void *fh,
487				 struct v4l2_streamparm *a)
488{
489	if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
490		return -EINVAL;
491
492	a->parm.capture.readbuffers = 1;
493	a->parm.capture.timeperframe.numerator = 1;
494	a->parm.capture.timeperframe.denominator = 10;
495	return 0;
496}
497
498static const struct v4l2_ioctl_ops rmi_f54_video_ioctl_ops = {
499	.vidioc_querycap	= rmi_f54_vidioc_querycap,
500
501	.vidioc_enum_fmt_vid_cap = rmi_f54_vidioc_enum_fmt,
502	.vidioc_s_fmt_vid_cap	= rmi_f54_vidioc_fmt,
503	.vidioc_g_fmt_vid_cap	= rmi_f54_vidioc_fmt,
504	.vidioc_try_fmt_vid_cap	= rmi_f54_vidioc_fmt,
505	.vidioc_g_parm		= rmi_f54_vidioc_g_parm,
506
507	.vidioc_enum_input	= rmi_f54_vidioc_enum_input,
508	.vidioc_g_input		= rmi_f54_vidioc_g_input,
509	.vidioc_s_input		= rmi_f54_vidioc_s_input,
510
511	.vidioc_reqbufs		= vb2_ioctl_reqbufs,
512	.vidioc_create_bufs	= vb2_ioctl_create_bufs,
513	.vidioc_querybuf	= vb2_ioctl_querybuf,
514	.vidioc_qbuf		= vb2_ioctl_qbuf,
515	.vidioc_dqbuf		= vb2_ioctl_dqbuf,
516	.vidioc_expbuf		= vb2_ioctl_expbuf,
517
518	.vidioc_streamon	= vb2_ioctl_streamon,
519	.vidioc_streamoff	= vb2_ioctl_streamoff,
520};
521
522static const struct video_device rmi_f54_video_device = {
523	.name = "Synaptics RMI4",
524	.fops = &rmi_f54_video_fops,
525	.ioctl_ops = &rmi_f54_video_ioctl_ops,
526	.release = video_device_release_empty,
527	.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TOUCH |
528		       V4L2_CAP_READWRITE | V4L2_CAP_STREAMING,
529};
530
531static void rmi_f54_work(struct work_struct *work)
532{
533	struct f54_data *f54 = container_of(work, struct f54_data, work.work);
534	struct rmi_function *fn = f54->fn;
535	u8 fifo[2];
536	int report_size;
537	u8 command;
538	int error;
539	int i;
540
541	mutex_lock(&f54->data_mutex);
542
543	report_size = rmi_f54_get_report_size(f54);
544	if (report_size == 0) {
545		dev_err(&fn->dev, "Bad report size, report type=%d\n",
546				f54->report_type);
547		error = -EINVAL;
548		goto error;     /* retry won't help */
549	}
550
551	/*
552	 * Need to check if command has completed.
553	 * If not try again later.
554	 */
555	error = rmi_read(fn->rmi_dev, f54->fn->fd.command_base_addr,
556			 &command);
557	if (error) {
558		dev_err(&fn->dev, "Failed to read back command\n");
559		goto error;
560	}
561	if (command & F54_GET_REPORT) {
562		if (time_after(jiffies, f54->timeout)) {
563			dev_err(&fn->dev, "Get report command timed out\n");
564			error = -ETIMEDOUT;
565		}
566		report_size = 0;
567		goto error;
568	}
569
570	rmi_dbg(RMI_DEBUG_FN, &fn->dev, "Get report command completed, reading data\n");
571
572	for (i = 0; i < report_size; i += F54_REPORT_DATA_SIZE) {
573		int size = min(F54_REPORT_DATA_SIZE, report_size - i);
574
575		fifo[0] = i & 0xff;
576		fifo[1] = i >> 8;
577		error = rmi_write_block(fn->rmi_dev,
578					fn->fd.data_base_addr + F54_FIFO_OFFSET,
579					fifo, sizeof(fifo));
580		if (error) {
581			dev_err(&fn->dev, "Failed to set fifo start offset\n");
582			goto abort;
583		}
584
585		error = rmi_read_block(fn->rmi_dev, fn->fd.data_base_addr +
586				       F54_REPORT_DATA_OFFSET,
587				       f54->report_data + i, size);
588		if (error) {
589			dev_err(&fn->dev, "%s: read [%d bytes] returned %d\n",
590				__func__, size, error);
591			goto abort;
592		}
593	}
594
595abort:
596	f54->report_size = error ? 0 : report_size;
597error:
598	if (error)
599		report_size = 0;
600
601	if (report_size == 0 && !error) {
602		queue_delayed_work(f54->workqueue, &f54->work,
603				   msecs_to_jiffies(1));
604	} else {
605		f54->is_busy = false;
606		complete(&f54->cmd_done);
607	}
608
609	mutex_unlock(&f54->data_mutex);
610}
611
612static int rmi_f54_config(struct rmi_function *fn)
613{
614	struct rmi_driver *drv = fn->rmi_dev->driver;
615
616	drv->clear_irq_bits(fn->rmi_dev, fn->irq_mask);
617
618	return 0;
619}
620
621static int rmi_f54_detect(struct rmi_function *fn)
622{
623	int error;
624	struct f54_data *f54;
625	u8 buf[6];
626
627	f54 = dev_get_drvdata(&fn->dev);
628
629	error = rmi_read_block(fn->rmi_dev, fn->fd.query_base_addr,
630			       buf, sizeof(buf));
631	if (error) {
632		dev_err(&fn->dev, "%s: Failed to query F54 properties\n",
633			__func__);
634		return error;
635	}
636
637	f54->num_rx_electrodes = buf[0];
638	f54->num_tx_electrodes = buf[1];
639	f54->capabilities = buf[2];
640	f54->clock_rate = buf[3] | (buf[4] << 8);
641	f54->family = buf[5];
642
643	rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 num_rx_electrodes: %d\n",
644		f54->num_rx_electrodes);
645	rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 num_tx_electrodes: %d\n",
646		f54->num_tx_electrodes);
647	rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 capabilities: 0x%x\n",
648		f54->capabilities);
649	rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 clock rate: 0x%x\n",
650		f54->clock_rate);
651	rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 family: 0x%x\n",
652		f54->family);
653
654	f54->is_busy = false;
655
656	return 0;
657}
658
659static int rmi_f54_probe(struct rmi_function *fn)
660{
661	struct f54_data *f54;
662	int ret;
663	u8 rx, tx;
664
665	f54 = devm_kzalloc(&fn->dev, sizeof(struct f54_data), GFP_KERNEL);
666	if (!f54)
667		return -ENOMEM;
668
669	f54->fn = fn;
670	dev_set_drvdata(&fn->dev, f54);
671
672	ret = rmi_f54_detect(fn);
673	if (ret)
674		return ret;
675
676	mutex_init(&f54->data_mutex);
677	mutex_init(&f54->status_mutex);
678
679	rx = f54->num_rx_electrodes;
680	tx = f54->num_tx_electrodes;
681	f54->report_data = devm_kzalloc(&fn->dev,
682					array3_size(tx, rx, sizeof(u16)),
683					GFP_KERNEL);
684	if (f54->report_data == NULL)
685		return -ENOMEM;
686
687	INIT_DELAYED_WORK(&f54->work, rmi_f54_work);
688
689	f54->workqueue = create_singlethread_workqueue("rmi4-poller");
690	if (!f54->workqueue)
691		return -ENOMEM;
692
693	rmi_f54_create_input_map(f54);
694	rmi_f54_set_input(f54, 0);
695
696	/* register video device */
697	strscpy(f54->v4l2.name, F54_NAME, sizeof(f54->v4l2.name));
698	ret = v4l2_device_register(&fn->dev, &f54->v4l2);
699	if (ret) {
700		dev_err(&fn->dev, "Unable to register video dev.\n");
701		goto remove_wq;
702	}
703
704	/* initialize the queue */
705	mutex_init(&f54->lock);
706	f54->queue = rmi_f54_queue;
707	f54->queue.drv_priv = f54;
708	f54->queue.lock = &f54->lock;
709	f54->queue.dev = &fn->dev;
710
711	ret = vb2_queue_init(&f54->queue);
712	if (ret)
713		goto remove_v4l2;
714
715	f54->vdev = rmi_f54_video_device;
716	f54->vdev.v4l2_dev = &f54->v4l2;
717	f54->vdev.lock = &f54->lock;
718	f54->vdev.vfl_dir = VFL_DIR_RX;
719	f54->vdev.queue = &f54->queue;
720	video_set_drvdata(&f54->vdev, f54);
721
722	ret = video_register_device(&f54->vdev, VFL_TYPE_TOUCH, -1);
723	if (ret) {
724		dev_err(&fn->dev, "Unable to register video subdevice.");
725		goto remove_v4l2;
726	}
727
728	return 0;
729
730remove_v4l2:
731	v4l2_device_unregister(&f54->v4l2);
732remove_wq:
733	cancel_delayed_work_sync(&f54->work);
734	destroy_workqueue(f54->workqueue);
735	return ret;
736}
737
738static void rmi_f54_remove(struct rmi_function *fn)
739{
740	struct f54_data *f54 = dev_get_drvdata(&fn->dev);
741
742	video_unregister_device(&f54->vdev);
743	v4l2_device_unregister(&f54->v4l2);
744	destroy_workqueue(f54->workqueue);
745}
746
747struct rmi_function_handler rmi_f54_handler = {
748	.driver = {
749		.name = F54_NAME,
750	},
751	.func = 0x54,
752	.probe = rmi_f54_probe,
753	.config = rmi_f54_config,
754	.remove = rmi_f54_remove,
755};