[media] Input: synaptics-rmi4 - add support for F54 diagnostics (3a762dbd) · Commits · e / devices / android_kernel_oneplus_sm7250

drivers/input/rmi4/Kconfig

+11 −0

Original line number	Diff line number	Diff line
		@@ -61,3 +61,14 @@ config RMI4_F30

		Function 30 provides GPIO and LED support for RMI4 devices. This
		includes support for buttons on TouchPads and ClickPads.

		config RMI4_F54
		bool "RMI4 Function 54 (Analog diagnostics)"
		depends on RMI4_CORE
		depends on VIDEO_V4L2
		select VIDEOBUF2_VMALLOC
		help
		Say Y here if you want to add support for RMI4 function 54

		Function 54 provides access to various diagnostic features in certain
		RMI4 touch sensors.

drivers/input/rmi4/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -7,6 +7,7 @@ rmi_core-$(CONFIG_RMI4_2D_SENSOR) += rmi_2d_sensor.o
		rmi_core-$(CONFIG_RMI4_F11) += rmi_f11.o
		rmi_core-$(CONFIG_RMI4_F12) += rmi_f12.o
		rmi_core-$(CONFIG_RMI4_F30) += rmi_f30.o
		rmi_core-$(CONFIG_RMI4_F54) += rmi_f54.o

		# Transports
		obj-$(CONFIG_RMI4_I2C) += rmi_i2c.o

drivers/input/rmi4/rmi_bus.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -312,6 +312,9 @@ static struct rmi_function_handler *fn_handlers[] = {
		#ifdef CONFIG_RMI4_F30
		&rmi_f30_handler,
		#endif
		#ifdef CONFIG_RMI4_F54
		&rmi_f54_handler,
		#endif
		};

		static void __rmi_unregister_function_handlers(int start_idx)

drivers/input/rmi4/rmi_driver.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -102,4 +102,5 @@ extern struct rmi_function_handler rmi_f01_handler;
		extern struct rmi_function_handler rmi_f11_handler;
		extern struct rmi_function_handler rmi_f12_handler;
		extern struct rmi_function_handler rmi_f30_handler;
		extern struct rmi_function_handler rmi_f54_handler;
		#endif

drivers/input/rmi4/rmi_f54.c

0 → 100644

+756 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (c) 2012-2015 Synaptics Incorporated
		*
		* 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

		/* Fixed sizes of reports */
		#define F54_QUERY_LEN 27

		/* 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 qry[F54_QUERY_LEN];
		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)
		return error;

		init_completion(&f54->cmd_done);

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

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

		mutex_unlock(&f54->data_mutex);

		return 0;
		}

		static size_t rmi_f54_get_report_size(struct f54_data *f54)
		{
		u8 rx = f54->num_rx_electrodes ? : f54->num_rx_electrodes;
		u8 tx = f54->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 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 = f54->num_rx_electrodes;
		f->height = f54->num_tx_electrodes;
		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;

		f54 = dev_get_drvdata(&fn->dev);

		error = rmi_read_block(fn->rmi_dev, fn->fd.query_base_addr,
		&f54->qry, sizeof(f54->qry));
		if (error) {
		dev_err(&fn->dev, "%s: Failed to query F54 properties\n",
		__func__);
		return error;
		}

		f54->num_rx_electrodes = f54->qry[0];
		f54->num_tx_electrodes = f54->qry[1];
		f54->capabilities = f54->qry[2];
		f54->clock_rate = f54->qry[3] \| (f54->qry[4] << 8);
		f54->family = f54->qry[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,
		};