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linux/drivers/input/touchscreen/sur40.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Surface2.0/SUR40/PixelSense input driver
*
* Copyright (c) 2014 by Florian 'floe' Echtler <floe@butterbrot.org>
*
* Derived from the USB Skeleton driver 1.1,
* Copyright (c) 2003 Greg Kroah-Hartman (greg@kroah.com)
*
* and from the Apple USB BCM5974 multitouch driver,
* Copyright (c) 2008 Henrik Rydberg (rydberg@euromail.se)
*
* and from the generic hid-multitouch driver,
* Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr>
*
* and from the v4l2-pci-skeleton driver,
* Copyright (c) Copyright 2014 Cisco Systems, Inc.
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/completion.h>
#include <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/printk.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/usb/input.h>
#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-ctrls.h>
#include <media/videobuf2-v4l2.h>
#include <media/videobuf2-dma-sg.h>
/* read 512 bytes from endpoint 0x86 -> get header + blobs */
struct sur40_header {
__le16 type; /* always 0x0001 */
__le16 count; /* count of blobs (if 0: continue prev. packet) */
__le32 packet_id; /* unique ID for all packets in one frame */
__le32 timestamp; /* milliseconds (inc. by 16 or 17 each frame) */
__le32 unknown; /* "epoch?" always 02/03 00 00 00 */
} __packed;
struct sur40_blob {
__le16 blob_id;
u8 action; /* 0x02 = enter/exit, 0x03 = update (?) */
u8 type; /* bitmask (0x01 blob, 0x02 touch, 0x04 tag) */
__le16 bb_pos_x; /* upper left corner of bounding box */
__le16 bb_pos_y;
__le16 bb_size_x; /* size of bounding box */
__le16 bb_size_y;
__le16 pos_x; /* finger tip position */
__le16 pos_y;
__le16 ctr_x; /* centroid position */
__le16 ctr_y;
__le16 axis_x; /* somehow related to major/minor axis, mostly: */
__le16 axis_y; /* axis_x == bb_size_y && axis_y == bb_size_x */
__le32 angle; /* orientation in radians relative to x axis -
actually an IEEE754 float, don't use in kernel */
__le32 area; /* size in pixels/pressure (?) */
u8 padding[24];
__le32 tag_id; /* valid when type == 0x04 (SUR40_TAG) */
__le32 unknown;
} __packed;
/* combined header/blob data */
struct sur40_data {
struct sur40_header header;
struct sur40_blob blobs[];
} __packed;
/* read 512 bytes from endpoint 0x82 -> get header below
* continue reading 16k blocks until header.size bytes read */
struct sur40_image_header {
__le32 magic; /* "SUBF" */
__le32 packet_id;
__le32 size; /* always 0x0007e900 = 960x540 */
__le32 timestamp; /* milliseconds (increases by 16 or 17 each frame) */
__le32 unknown; /* "epoch?" always 02/03 00 00 00 */
} __packed;
/* version information */
#define DRIVER_SHORT "sur40"
#define DRIVER_LONG "Samsung SUR40"
#define DRIVER_AUTHOR "Florian 'floe' Echtler <floe@butterbrot.org>"
#define DRIVER_DESC "Surface2.0/SUR40/PixelSense input driver"
/* vendor and device IDs */
#define ID_MICROSOFT 0x045e
#define ID_SUR40 0x0775
/* sensor resolution */
#define SENSOR_RES_X 1920
#define SENSOR_RES_Y 1080
/* touch data endpoint */
#define TOUCH_ENDPOINT 0x86
/* video data endpoint */
#define VIDEO_ENDPOINT 0x82
/* video header fields */
#define VIDEO_HEADER_MAGIC 0x46425553
#define VIDEO_PACKET_SIZE 16384
/* polling interval (ms) */
#define POLL_INTERVAL 1
/* maximum number of contacts FIXME: this is a guess? */
#define MAX_CONTACTS 64
/* control commands */
#define SUR40_GET_VERSION 0xb0 /* 12 bytes string */
#define SUR40_ACCEL_CAPS 0xb3 /* 5 bytes */
#define SUR40_SENSOR_CAPS 0xc1 /* 24 bytes */
#define SUR40_POKE 0xc5 /* poke register byte */
#define SUR40_PEEK 0xc4 /* 48 bytes registers */
#define SUR40_GET_STATE 0xc5 /* 4 bytes state (?) */
#define SUR40_GET_SENSORS 0xb1 /* 8 bytes sensors */
#define SUR40_BLOB 0x01
#define SUR40_TOUCH 0x02
#define SUR40_TAG 0x04
/* video controls */
#define SUR40_BRIGHTNESS_MAX 0xff
#define SUR40_BRIGHTNESS_MIN 0x00
#define SUR40_BRIGHTNESS_DEF 0xff
#define SUR40_CONTRAST_MAX 0x0f
#define SUR40_CONTRAST_MIN 0x00
#define SUR40_CONTRAST_DEF 0x0a
#define SUR40_GAIN_MAX 0x09
#define SUR40_GAIN_MIN 0x00
#define SUR40_GAIN_DEF 0x08
#define SUR40_BACKLIGHT_MAX 0x01
#define SUR40_BACKLIGHT_MIN 0x00
#define SUR40_BACKLIGHT_DEF 0x01
#define sur40_str(s) #s
#define SUR40_PARAM_RANGE(lo, hi) " (range " sur40_str(lo) "-" sur40_str(hi) ")"
/* module parameters */
static uint brightness = SUR40_BRIGHTNESS_DEF;
module_param(brightness, uint, 0644);
MODULE_PARM_DESC(brightness, "set initial brightness"
SUR40_PARAM_RANGE(SUR40_BRIGHTNESS_MIN, SUR40_BRIGHTNESS_MAX));
static uint contrast = SUR40_CONTRAST_DEF;
module_param(contrast, uint, 0644);
MODULE_PARM_DESC(contrast, "set initial contrast"
SUR40_PARAM_RANGE(SUR40_CONTRAST_MIN, SUR40_CONTRAST_MAX));
static uint gain = SUR40_GAIN_DEF;
module_param(gain, uint, 0644);
MODULE_PARM_DESC(gain, "set initial gain"
SUR40_PARAM_RANGE(SUR40_GAIN_MIN, SUR40_GAIN_MAX));
static const struct v4l2_pix_format sur40_pix_format[] = {
{
.pixelformat = V4L2_TCH_FMT_TU08,
.width = SENSOR_RES_X / 2,
.height = SENSOR_RES_Y / 2,
.field = V4L2_FIELD_NONE,
.colorspace = V4L2_COLORSPACE_RAW,
.bytesperline = SENSOR_RES_X / 2,
.sizeimage = (SENSOR_RES_X/2) * (SENSOR_RES_Y/2),
},
{
.pixelformat = V4L2_PIX_FMT_GREY,
.width = SENSOR_RES_X / 2,
.height = SENSOR_RES_Y / 2,
.field = V4L2_FIELD_NONE,
.colorspace = V4L2_COLORSPACE_RAW,
.bytesperline = SENSOR_RES_X / 2,
.sizeimage = (SENSOR_RES_X/2) * (SENSOR_RES_Y/2),
}
};
/* master device state */
struct sur40_state {
struct usb_device *usbdev;
struct device *dev;
struct input_dev *input;
struct v4l2_device v4l2;
struct video_device vdev;
struct mutex lock;
struct v4l2_pix_format pix_fmt;
struct v4l2_ctrl_handler hdl;
struct vb2_queue queue;
struct list_head buf_list;
spinlock_t qlock;
int sequence;
struct sur40_data *bulk_in_buffer;
size_t bulk_in_size;
u8 bulk_in_epaddr;
u8 vsvideo;
char phys[64];
};
struct sur40_buffer {
struct vb2_v4l2_buffer vb;
struct list_head list;
};
/* forward declarations */
static const struct video_device sur40_video_device;
static const struct vb2_queue sur40_queue;
static void sur40_process_video(struct sur40_state *sur40);
static int sur40_s_ctrl(struct v4l2_ctrl *ctrl);
static const struct v4l2_ctrl_ops sur40_ctrl_ops = {
.s_ctrl = sur40_s_ctrl,
};
/*
* Note: an earlier, non-public version of this driver used USB_RECIP_ENDPOINT
* here by mistake which is very likely to have corrupted the firmware EEPROM
* on two separate SUR40 devices. Thanks to Alan Stern who spotted this bug.
* Should you ever run into a similar problem, the background story to this
* incident and instructions on how to fix the corrupted EEPROM are available
* at https://floe.butterbrot.org/matrix/hacking/surface/brick.html
*/
/* command wrapper */
static int sur40_command(struct sur40_state *dev,
u8 command, u16 index, void *buffer, u16 size)
{
return usb_control_msg(dev->usbdev, usb_rcvctrlpipe(dev->usbdev, 0),
command,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
0x00, index, buffer, size, 1000);
}
/* poke a byte in the panel register space */
static int sur40_poke(struct sur40_state *dev, u8 offset, u8 value)
{
int result;
u8 index = 0x96; // 0xae for permanent write
result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
0x32, index, NULL, 0, 1000);
if (result < 0)
goto error;
msleep(5);
result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
0x72, offset, NULL, 0, 1000);
if (result < 0)
goto error;
msleep(5);
result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
0xb2, value, NULL, 0, 1000);
if (result < 0)
goto error;
msleep(5);
error:
return result;
}
static int sur40_set_preprocessor(struct sur40_state *dev, u8 value)
{
u8 setting_07[2] = { 0x01, 0x00 };
u8 setting_17[2] = { 0x85, 0x80 };
int result;
if (value > 1)
return -ERANGE;
result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
0x07, setting_07[value], NULL, 0, 1000);
if (result < 0)
goto error;
msleep(5);
result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
0x17, setting_17[value], NULL, 0, 1000);
if (result < 0)
goto error;
msleep(5);
error:
return result;
}
static void sur40_set_vsvideo(struct sur40_state *handle, u8 value)
{
int i;
for (i = 0; i < 4; i++)
sur40_poke(handle, 0x1c+i, value);
handle->vsvideo = value;
}
static void sur40_set_irlevel(struct sur40_state *handle, u8 value)
{
int i;
for (i = 0; i < 8; i++)
sur40_poke(handle, 0x08+(2*i), value);
}
/* Initialization routine, called from sur40_open */
static int sur40_init(struct sur40_state *dev)
{
int result;
u8 *buffer;
buffer = kmalloc(24, GFP_KERNEL);
if (!buffer) {
result = -ENOMEM;
goto error;
}
/* stupidly replay the original MS driver init sequence */
result = sur40_command(dev, SUR40_GET_VERSION, 0x00, buffer, 12);
if (result < 0)
goto error;
result = sur40_command(dev, SUR40_GET_VERSION, 0x01, buffer, 12);
if (result < 0)
goto error;
result = sur40_command(dev, SUR40_GET_VERSION, 0x02, buffer, 12);
if (result < 0)
goto error;
result = sur40_command(dev, SUR40_SENSOR_CAPS, 0x00, buffer, 24);
if (result < 0)
goto error;
result = sur40_command(dev, SUR40_ACCEL_CAPS, 0x00, buffer, 5);
if (result < 0)
goto error;
result = sur40_command(dev, SUR40_GET_VERSION, 0x03, buffer, 12);
if (result < 0)
goto error;
result = 0;
/*
* Discard the result buffer - no known data inside except
* some version strings, maybe extract these sometime...
*/
error:
kfree(buffer);
return result;
}
/*
* Callback routines from input_dev
*/
/* Enable the device, polling will now start. */
static int sur40_open(struct input_dev *input)
{
struct sur40_state *sur40 = input_get_drvdata(input);
dev_dbg(sur40->dev, "open\n");
return sur40_init(sur40);
}
/* Disable device, polling has stopped. */
static void sur40_close(struct input_dev *input)
{
struct sur40_state *sur40 = input_get_drvdata(input);
dev_dbg(sur40->dev, "close\n");
/*
* There is no known way to stop the device, so we simply
* stop polling.
*/
}
/*
* This function is called when a whole contact has been processed,
* so that it can assign it to a slot and store the data there.
*/
static void sur40_report_blob(struct sur40_blob *blob, struct input_dev *input)
{
int wide, major, minor;
int bb_size_x, bb_size_y, pos_x, pos_y, ctr_x, ctr_y, slotnum;
if (blob->type != SUR40_TOUCH)
return;
slotnum = input_mt_get_slot_by_key(input, blob->blob_id);
if (slotnum < 0 || slotnum >= MAX_CONTACTS)
return;
bb_size_x = le16_to_cpu(blob->bb_size_x);
bb_size_y = le16_to_cpu(blob->bb_size_y);
pos_x = le16_to_cpu(blob->pos_x);
pos_y = le16_to_cpu(blob->pos_y);
ctr_x = le16_to_cpu(blob->ctr_x);
ctr_y = le16_to_cpu(blob->ctr_y);
input_mt_slot(input, slotnum);
input_mt_report_slot_state(input, MT_TOOL_FINGER, 1);
wide = (bb_size_x > bb_size_y);
major = max(bb_size_x, bb_size_y);
minor = min(bb_size_x, bb_size_y);
input_report_abs(input, ABS_MT_POSITION_X, pos_x);
input_report_abs(input, ABS_MT_POSITION_Y, pos_y);
input_report_abs(input, ABS_MT_TOOL_X, ctr_x);
input_report_abs(input, ABS_MT_TOOL_Y, ctr_y);
/* TODO: use a better orientation measure */
input_report_abs(input, ABS_MT_ORIENTATION, wide);
input_report_abs(input, ABS_MT_TOUCH_MAJOR, major);
input_report_abs(input, ABS_MT_TOUCH_MINOR, minor);
}
/* core function: poll for new input data */
static void sur40_poll(struct input_dev *input)
{
struct sur40_state *sur40 = input_get_drvdata(input);
int result, bulk_read, need_blobs, packet_blobs, i;
struct sur40_header *header = &sur40->bulk_in_buffer->header;
struct sur40_blob *inblob = &sur40->bulk_in_buffer->blobs[0];
dev_dbg(sur40->dev, "poll\n");
need_blobs = -1;
do {
/* perform a blocking bulk read to get data from the device */
result = usb_bulk_msg(sur40->usbdev,
usb_rcvbulkpipe(sur40->usbdev, sur40->bulk_in_epaddr),
sur40->bulk_in_buffer, sur40->bulk_in_size,
&bulk_read, 1000);
dev_dbg(sur40->dev, "received %d bytes\n", bulk_read);
if (result < 0) {
dev_err(sur40->dev, "error in usb_bulk_read\n");
return;
}
result = bulk_read - sizeof(struct sur40_header);
if (result % sizeof(struct sur40_blob) != 0) {
dev_err(sur40->dev, "transfer size mismatch\n");
return;
}
/* first packet? */
if (need_blobs == -1) {
need_blobs = le16_to_cpu(header->count);
dev_dbg(sur40->dev, "need %d blobs\n", need_blobs);
/* packet_id = le32_to_cpu(header->packet_id); */
}
/*
* Sanity check. when video data is also being retrieved, the
* packet ID will usually increase in the middle of a series
* instead of at the end. However, the data is still consistent,
* so the packet ID is probably just valid for the first packet
* in a series.
if (packet_id != le32_to_cpu(header->packet_id))
dev_dbg(sur40->dev, "packet ID mismatch\n");
*/
packet_blobs = result / sizeof(struct sur40_blob);
dev_dbg(sur40->dev, "received %d blobs\n", packet_blobs);
/* packets always contain at least 4 blobs, even if empty */
if (packet_blobs > need_blobs)
packet_blobs = need_blobs;
for (i = 0; i < packet_blobs; i++) {
need_blobs--;
dev_dbg(sur40->dev, "processing blob\n");
sur40_report_blob(&(inblob[i]), input);
}
} while (need_blobs > 0);
input_mt_sync_frame(input);
input_sync(input);
sur40_process_video(sur40);
}
/* deal with video data */
static void sur40_process_video(struct sur40_state *sur40)
{
struct sur40_image_header *img = (void *)(sur40->bulk_in_buffer);
struct sur40_buffer *new_buf;
struct usb_sg_request sgr;
struct sg_table *sgt;
int result, bulk_read;
if (!vb2_start_streaming_called(&sur40->queue))
return;
/* get a new buffer from the list */
spin_lock(&sur40->qlock);
if (list_empty(&sur40->buf_list)) {
dev_dbg(sur40->dev, "buffer queue empty\n");
spin_unlock(&sur40->qlock);
return;
}
new_buf = list_entry(sur40->buf_list.next, struct sur40_buffer, list);
list_del(&new_buf->list);
spin_unlock(&sur40->qlock);
dev_dbg(sur40->dev, "buffer acquired\n");
/* retrieve data via bulk read */
result = usb_bulk_msg(sur40->usbdev,
usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT),
sur40->bulk_in_buffer, sur40->bulk_in_size,
&bulk_read, 1000);
if (result < 0) {
dev_err(sur40->dev, "error in usb_bulk_read\n");
goto err_poll;
}
if (bulk_read != sizeof(struct sur40_image_header)) {
dev_err(sur40->dev, "received %d bytes (%zd expected)\n",
bulk_read, sizeof(struct sur40_image_header));
goto err_poll;
}
if (le32_to_cpu(img->magic) != VIDEO_HEADER_MAGIC) {
dev_err(sur40->dev, "image magic mismatch\n");
goto err_poll;
}
if (le32_to_cpu(img->size) != sur40->pix_fmt.sizeimage) {
dev_err(sur40->dev, "image size mismatch\n");
goto err_poll;
}
dev_dbg(sur40->dev, "header acquired\n");
sgt = vb2_dma_sg_plane_desc(&new_buf->vb.vb2_buf, 0);
result = usb_sg_init(&sgr, sur40->usbdev,
usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT), 0,
sgt->sgl, sgt->nents, sur40->pix_fmt.sizeimage, 0);
if (result < 0) {
dev_err(sur40->dev, "error %d in usb_sg_init\n", result);
goto err_poll;
}
usb_sg_wait(&sgr);
if (sgr.status < 0) {
dev_err(sur40->dev, "error %d in usb_sg_wait\n", sgr.status);
goto err_poll;
}
dev_dbg(sur40->dev, "image acquired\n");
/* return error if streaming was stopped in the meantime */
if (sur40->sequence == -1)
return;
/* mark as finished */
new_buf->vb.vb2_buf.timestamp = ktime_get_ns();
new_buf->vb.sequence = sur40->sequence++;
new_buf->vb.field = V4L2_FIELD_NONE;
vb2_buffer_done(&new_buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
dev_dbg(sur40->dev, "buffer marked done\n");
return;
err_poll:
vb2_buffer_done(&new_buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
}
/* Initialize input device parameters. */
static int sur40_input_setup_events(struct input_dev *input_dev)
{
int error;
input_set_abs_params(input_dev, ABS_MT_POSITION_X,
0, SENSOR_RES_X, 0, 0);
input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
0, SENSOR_RES_Y, 0, 0);
input_set_abs_params(input_dev, ABS_MT_TOOL_X,
0, SENSOR_RES_X, 0, 0);
input_set_abs_params(input_dev, ABS_MT_TOOL_Y,
0, SENSOR_RES_Y, 0, 0);
/* max value unknown, but major/minor axis
* can never be larger than screen */
input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
0, SENSOR_RES_X, 0, 0);
input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR,
0, SENSOR_RES_Y, 0, 0);
input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0);
error = input_mt_init_slots(input_dev, MAX_CONTACTS,
INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
if (error) {
dev_err(input_dev->dev.parent, "failed to set up slots\n");
return error;
}
return 0;
}
/* Check candidate USB interface. */
static int sur40_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
struct usb_device *usbdev = interface_to_usbdev(interface);
struct sur40_state *sur40;
struct usb_host_interface *iface_desc;
struct usb_endpoint_descriptor *endpoint;
struct input_dev *input;
int error;
/* Check if we really have the right interface. */
iface_desc = interface->cur_altsetting;
if (iface_desc->desc.bInterfaceClass != 0xFF)
return -ENODEV;
if (iface_desc->desc.bNumEndpoints < 5)
return -ENODEV;
/* Use endpoint #4 (0x86). */
endpoint = &iface_desc->endpoint[4].desc;
if (endpoint->bEndpointAddress != TOUCH_ENDPOINT)
return -ENODEV;
/* Allocate memory for our device state and initialize it. */
sur40 = kzalloc(sizeof(struct sur40_state), GFP_KERNEL);
if (!sur40)
return -ENOMEM;
input = input_allocate_device();
if (!input) {
error = -ENOMEM;
goto err_free_dev;
}
/* initialize locks/lists */
INIT_LIST_HEAD(&sur40->buf_list);
spin_lock_init(&sur40->qlock);
mutex_init(&sur40->lock);
/* Set up regular input device structure */
input->name = DRIVER_LONG;
usb_to_input_id(usbdev, &input->id);
usb_make_path(usbdev, sur40->phys, sizeof(sur40->phys));
strlcat(sur40->phys, "/input0", sizeof(sur40->phys));
input->phys = sur40->phys;
input->dev.parent = &interface->dev;
input->open = sur40_open;
input->close = sur40_close;
error = sur40_input_setup_events(input);
if (error)
goto err_free_input;
input_set_drvdata(input, sur40);
error = input_setup_polling(input, sur40_poll);
if (error) {
dev_err(&interface->dev, "failed to set up polling");
goto err_free_input;
}
input_set_poll_interval(input, POLL_INTERVAL);
sur40->usbdev = usbdev;
sur40->dev = &interface->dev;
sur40->input = input;
/* use the bulk-in endpoint tested above */
sur40->bulk_in_size = usb_endpoint_maxp(endpoint);
sur40->bulk_in_epaddr = endpoint->bEndpointAddress;
sur40->bulk_in_buffer = kmalloc(sur40->bulk_in_size, GFP_KERNEL);
if (!sur40->bulk_in_buffer) {
dev_err(&interface->dev, "Unable to allocate input buffer.");
error = -ENOMEM;
goto err_free_input;
}
/* register the polled input device */
error = input_register_device(input);
if (error) {
dev_err(&interface->dev,
"Unable to register polled input device.");
goto err_free_buffer;
}
/* register the video master device */
snprintf(sur40->v4l2.name, sizeof(sur40->v4l2.name), "%s", DRIVER_LONG);
error = v4l2_device_register(sur40->dev, &sur40->v4l2);
if (error) {
dev_err(&interface->dev,
"Unable to register video master device.");
goto err_unreg_v4l2;
}
/* initialize the lock and subdevice */
sur40->queue = sur40_queue;
sur40->queue.drv_priv = sur40;
sur40->queue.lock = &sur40->lock;
sur40->queue.dev = sur40->dev;
/* initialize the queue */
error = vb2_queue_init(&sur40->queue);
if (error)
goto err_unreg_v4l2;
sur40->pix_fmt = sur40_pix_format[0];
sur40->vdev = sur40_video_device;
sur40->vdev.v4l2_dev = &sur40->v4l2;
sur40->vdev.lock = &sur40->lock;
sur40->vdev.queue = &sur40->queue;
video_set_drvdata(&sur40->vdev, sur40);
/* initialize the control handler for 4 controls */
v4l2_ctrl_handler_init(&sur40->hdl, 4);
sur40->v4l2.ctrl_handler = &sur40->hdl;
sur40->vsvideo = (SUR40_CONTRAST_DEF << 4) | SUR40_GAIN_DEF;
v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops, V4L2_CID_BRIGHTNESS,
SUR40_BRIGHTNESS_MIN, SUR40_BRIGHTNESS_MAX, 1, clamp(brightness,
(uint)SUR40_BRIGHTNESS_MIN, (uint)SUR40_BRIGHTNESS_MAX));
v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops, V4L2_CID_CONTRAST,
SUR40_CONTRAST_MIN, SUR40_CONTRAST_MAX, 1, clamp(contrast,
(uint)SUR40_CONTRAST_MIN, (uint)SUR40_CONTRAST_MAX));
v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops, V4L2_CID_GAIN,
SUR40_GAIN_MIN, SUR40_GAIN_MAX, 1, clamp(gain,
(uint)SUR40_GAIN_MIN, (uint)SUR40_GAIN_MAX));
v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops,
V4L2_CID_BACKLIGHT_COMPENSATION, SUR40_BACKLIGHT_MIN,
SUR40_BACKLIGHT_MAX, 1, SUR40_BACKLIGHT_DEF);
v4l2_ctrl_handler_setup(&sur40->hdl);
if (sur40->hdl.error) {
dev_err(&interface->dev,
"Unable to register video controls.");
v4l2_ctrl_handler_free(&sur40->hdl);
goto err_unreg_v4l2;
}
error = video_register_device(&sur40->vdev, VFL_TYPE_TOUCH, -1);
if (error) {
dev_err(&interface->dev,
"Unable to register video subdevice.");
goto err_unreg_video;
}
/* we can register the device now, as it is ready */
usb_set_intfdata(interface, sur40);
dev_dbg(&interface->dev, "%s is now attached\n", DRIVER_DESC);
return 0;
err_unreg_video:
video_unregister_device(&sur40->vdev);
err_unreg_v4l2:
v4l2_device_unregister(&sur40->v4l2);
err_free_buffer:
kfree(sur40->bulk_in_buffer);
err_free_input:
input_free_device(input);
err_free_dev:
kfree(sur40);
return error;
}
/* Unregister device & clean up. */
static void sur40_disconnect(struct usb_interface *interface)
{
struct sur40_state *sur40 = usb_get_intfdata(interface);
v4l2_ctrl_handler_free(&sur40->hdl);
video_unregister_device(&sur40->vdev);
v4l2_device_unregister(&sur40->v4l2);
input_unregister_device(sur40->input);
kfree(sur40->bulk_in_buffer);
kfree(sur40);
usb_set_intfdata(interface, NULL);
dev_dbg(&interface->dev, "%s is now disconnected\n", DRIVER_DESC);
}
/*
* Setup the constraints of the queue: besides setting the number of planes
* per buffer and the size and allocation context of each plane, it also
* checks if sufficient buffers have been allocated. Usually 3 is a good
* minimum number: many DMA engines need a minimum of 2 buffers in the
* queue and you need to have another available for userspace processing.
*/
static int sur40_queue_setup(struct vb2_queue *q,
unsigned int *nbuffers, unsigned int *nplanes,
unsigned int sizes[], struct device *alloc_devs[])
{
struct sur40_state *sur40 = vb2_get_drv_priv(q);
if (q->num_buffers + *nbuffers < 3)
*nbuffers = 3 - q->num_buffers;
if (*nplanes)
return sizes[0] < sur40->pix_fmt.sizeimage ? -EINVAL : 0;
*nplanes = 1;
sizes[0] = sur40->pix_fmt.sizeimage;
return 0;
}
/*
* Prepare the buffer for queueing to the DMA engine: check and set the
* payload size.
*/
static int sur40_buffer_prepare(struct vb2_buffer *vb)
{
struct sur40_state *sur40 = vb2_get_drv_priv(vb->vb2_queue);
unsigned long size = sur40->pix_fmt.sizeimage;
if (vb2_plane_size(vb, 0) < size) {
dev_err(&sur40->usbdev->dev, "buffer too small (%lu < %lu)\n",
vb2_plane_size(vb, 0), size);
return -EINVAL;
}
vb2_set_plane_payload(vb, 0, size);
return 0;
}
/*
* Queue this buffer to the DMA engine.
*/
static void sur40_buffer_queue(struct vb2_buffer *vb)
{
struct sur40_state *sur40 = vb2_get_drv_priv(vb->vb2_queue);
struct sur40_buffer *buf = (struct sur40_buffer *)vb;
spin_lock(&sur40->qlock);
list_add_tail(&buf->list, &sur40->buf_list);
spin_unlock(&sur40->qlock);
}
static void return_all_buffers(struct sur40_state *sur40,
enum vb2_buffer_state state)
{
struct sur40_buffer *buf, *node;
spin_lock(&sur40->qlock);
list_for_each_entry_safe(buf, node, &sur40->buf_list, list) {
vb2_buffer_done(&buf->vb.vb2_buf, state);
list_del(&buf->list);
}
spin_unlock(&sur40->qlock);
}
/*
* Start streaming. First check if the minimum number of buffers have been
* queued. If not, then return -ENOBUFS and the vb2 framework will call
* this function again the next time a buffer has been queued until enough
* buffers are available to actually start the DMA engine.
*/
static int sur40_start_streaming(struct vb2_queue *vq, unsigned int count)
{
struct sur40_state *sur40 = vb2_get_drv_priv(vq);
sur40->sequence = 0;
return 0;
}
/*
* Stop the DMA engine. Any remaining buffers in the DMA queue are dequeued
* and passed on to the vb2 framework marked as STATE_ERROR.
*/
static void sur40_stop_streaming(struct vb2_queue *vq)
{
struct sur40_state *sur40 = vb2_get_drv_priv(vq);
vb2_wait_for_all_buffers(vq);
sur40->sequence = -1;
/* Release all active buffers */
return_all_buffers(sur40, VB2_BUF_STATE_ERROR);
}
/* V4L ioctl */
static int sur40_vidioc_querycap(struct file *file, void *priv,
struct v4l2_capability *cap)
{
struct sur40_state *sur40 = video_drvdata(file);
strlcpy(cap->driver, DRIVER_SHORT, sizeof(cap->driver));
strlcpy(cap->card, DRIVER_LONG, sizeof(cap->card));
usb_make_path(sur40->usbdev, cap->bus_info, sizeof(cap->bus_info));
return 0;
}
static int sur40_vidioc_enum_input(struct file *file, void *priv,
struct v4l2_input *i)
{
if (i->index != 0)
return -EINVAL;
i->type = V4L2_INPUT_TYPE_TOUCH;
i->std = V4L2_STD_UNKNOWN;
strlcpy(i->name, "In-Cell Sensor", sizeof(i->name));
i->capabilities = 0;
return 0;
}
static int sur40_vidioc_s_input(struct file *file, void *priv, unsigned int i)
{
return (i == 0) ? 0 : -EINVAL;
}
static int sur40_vidioc_g_input(struct file *file, void *priv, unsigned int *i)
{
*i = 0;
return 0;
}
static int sur40_vidioc_try_fmt(struct file *file, void *priv,
struct v4l2_format *f)
{
switch (f->fmt.pix.pixelformat) {
case V4L2_PIX_FMT_GREY:
f->fmt.pix = sur40_pix_format[1];
break;
default:
f->fmt.pix = sur40_pix_format[0];
break;
}
return 0;
}
static int sur40_vidioc_s_fmt(struct file *file, void *priv,
struct v4l2_format *f)
{
struct sur40_state *sur40 = video_drvdata(file);
switch (f->fmt.pix.pixelformat) {
case V4L2_PIX_FMT_GREY:
sur40->pix_fmt = sur40_pix_format[1];
break;
default:
sur40->pix_fmt = sur40_pix_format[0];
break;
}
f->fmt.pix = sur40->pix_fmt;
return 0;
}
static int sur40_vidioc_g_fmt(struct file *file, void *priv,
struct v4l2_format *f)
{
struct sur40_state *sur40 = video_drvdata(file);
f->fmt.pix = sur40->pix_fmt;
return 0;
}
static int sur40_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct sur40_state *sur40 = container_of(ctrl->handler,
struct sur40_state, hdl);
u8 value = sur40->vsvideo;
switch (ctrl->id) {
case V4L2_CID_BRIGHTNESS:
sur40_set_irlevel(sur40, ctrl->val);
break;
case V4L2_CID_CONTRAST:
value = (value & 0x0f) | (ctrl->val << 4);
sur40_set_vsvideo(sur40, value);
break;
case V4L2_CID_GAIN:
value = (value & 0xf0) | (ctrl->val);
sur40_set_vsvideo(sur40, value);
break;
case V4L2_CID_BACKLIGHT_COMPENSATION:
sur40_set_preprocessor(sur40, ctrl->val);
break;
}
return 0;
}
static int sur40_ioctl_parm(struct file *file, void *priv,
struct v4l2_streamparm *p)
{
if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
p->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
p->parm.capture.timeperframe.numerator = 1;
p->parm.capture.timeperframe.denominator = 60;
p->parm.capture.readbuffers = 3;
return 0;
}
static int sur40_vidioc_enum_fmt(struct file *file, void *priv,
struct v4l2_fmtdesc *f)
{
if (f->index >= ARRAY_SIZE(sur40_pix_format))
return -EINVAL;
f->pixelformat = sur40_pix_format[f->index].pixelformat;
f->flags = 0;
return 0;
}
static int sur40_vidioc_enum_framesizes(struct file *file, void *priv,
struct v4l2_frmsizeenum *f)
{
struct sur40_state *sur40 = video_drvdata(file);
if ((f->index != 0) || ((f->pixel_format != V4L2_TCH_FMT_TU08)
&& (f->pixel_format != V4L2_PIX_FMT_GREY)))
return -EINVAL;
f->type = V4L2_FRMSIZE_TYPE_DISCRETE;
f->discrete.width = sur40->pix_fmt.width;
f->discrete.height = sur40->pix_fmt.height;
return 0;
}
static int sur40_vidioc_enum_frameintervals(struct file *file, void *priv,
struct v4l2_frmivalenum *f)
{
struct sur40_state *sur40 = video_drvdata(file);
if ((f->index > 0) || ((f->pixel_format != V4L2_TCH_FMT_TU08)
&& (f->pixel_format != V4L2_PIX_FMT_GREY))
|| (f->width != sur40->pix_fmt.width)
|| (f->height != sur40->pix_fmt.height))
return -EINVAL;
f->type = V4L2_FRMIVAL_TYPE_DISCRETE;
f->discrete.denominator = 60;
f->discrete.numerator = 1;
return 0;
}
static const struct usb_device_id sur40_table[] = {
{ USB_DEVICE(ID_MICROSOFT, ID_SUR40) }, /* Samsung SUR40 */
{ } /* terminating null entry */
};
MODULE_DEVICE_TABLE(usb, sur40_table);
/* V4L2 structures */
static const struct vb2_ops sur40_queue_ops = {
.queue_setup = sur40_queue_setup,
.buf_prepare = sur40_buffer_prepare,
.buf_queue = sur40_buffer_queue,
.start_streaming = sur40_start_streaming,
.stop_streaming = sur40_stop_streaming,
.wait_prepare = vb2_ops_wait_prepare,
.wait_finish = vb2_ops_wait_finish,
};
static const struct vb2_queue sur40_queue = {
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
/*
* VB2_USERPTR in currently not enabled: passing a user pointer to
* dma-sg will result in segment sizes that are not a multiple of
* 512 bytes, which is required by the host controller.
*/
.io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF,
.buf_struct_size = sizeof(struct sur40_buffer),
.ops = &sur40_queue_ops,
.mem_ops = &vb2_dma_sg_memops,
.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC,
.min_buffers_needed = 3,
};
static const struct v4l2_file_operations sur40_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 const struct v4l2_ioctl_ops sur40_video_ioctl_ops = {
.vidioc_querycap = sur40_vidioc_querycap,
.vidioc_enum_fmt_vid_cap = sur40_vidioc_enum_fmt,
.vidioc_try_fmt_vid_cap = sur40_vidioc_try_fmt,
.vidioc_s_fmt_vid_cap = sur40_vidioc_s_fmt,
.vidioc_g_fmt_vid_cap = sur40_vidioc_g_fmt,
.vidioc_enum_framesizes = sur40_vidioc_enum_framesizes,
.vidioc_enum_frameintervals = sur40_vidioc_enum_frameintervals,
.vidioc_g_parm = sur40_ioctl_parm,
.vidioc_s_parm = sur40_ioctl_parm,
.vidioc_enum_input = sur40_vidioc_enum_input,
.vidioc_g_input = sur40_vidioc_g_input,
.vidioc_s_input = sur40_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 sur40_video_device = {
.name = DRIVER_LONG,
.fops = &sur40_video_fops,
.ioctl_ops = &sur40_video_ioctl_ops,
.release = video_device_release_empty,
.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TOUCH |
V4L2_CAP_READWRITE | V4L2_CAP_STREAMING,
};
/* USB-specific object needed to register this driver with the USB subsystem. */
static struct usb_driver sur40_driver = {
.name = DRIVER_SHORT,
.probe = sur40_probe,
.disconnect = sur40_disconnect,
.id_table = sur40_table,
};
module_usb_driver(sur40_driver);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
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