991 lines
27 KiB
C
991 lines
27 KiB
C
/*
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* Surface2.0/SUR40/PixelSense input driver
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*
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* Copyright (c) 2014 by Florian 'floe' Echtler <floe@butterbrot.org>
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*
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* Derived from the USB Skeleton driver 1.1,
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* Copyright (c) 2003 Greg Kroah-Hartman (greg@kroah.com)
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*
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* and from the Apple USB BCM5974 multitouch driver,
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* Copyright (c) 2008 Henrik Rydberg (rydberg@euromail.se)
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*
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* and from the generic hid-multitouch driver,
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* Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr>
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*
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* and from the v4l2-pci-skeleton driver,
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* Copyright (c) Copyright 2014 Cisco Systems, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/completion.h>
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#include <linux/uaccess.h>
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#include <linux/usb.h>
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#include <linux/printk.h>
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#include <linux/input-polldev.h>
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#include <linux/input/mt.h>
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#include <linux/usb/input.h>
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#include <linux/videodev2.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-dev.h>
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#include <media/v4l2-ioctl.h>
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#include <media/videobuf2-v4l2.h>
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#include <media/videobuf2-dma-sg.h>
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/* read 512 bytes from endpoint 0x86 -> get header + blobs */
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struct sur40_header {
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__le16 type; /* always 0x0001 */
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__le16 count; /* count of blobs (if 0: continue prev. packet) */
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__le32 packet_id; /* unique ID for all packets in one frame */
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__le32 timestamp; /* milliseconds (inc. by 16 or 17 each frame) */
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__le32 unknown; /* "epoch?" always 02/03 00 00 00 */
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} __packed;
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struct sur40_blob {
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__le16 blob_id;
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u8 action; /* 0x02 = enter/exit, 0x03 = update (?) */
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u8 unknown; /* always 0x01 or 0x02 (no idea what this is?) */
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__le16 bb_pos_x; /* upper left corner of bounding box */
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__le16 bb_pos_y;
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__le16 bb_size_x; /* size of bounding box */
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__le16 bb_size_y;
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__le16 pos_x; /* finger tip position */
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__le16 pos_y;
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__le16 ctr_x; /* centroid position */
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__le16 ctr_y;
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__le16 axis_x; /* somehow related to major/minor axis, mostly: */
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__le16 axis_y; /* axis_x == bb_size_y && axis_y == bb_size_x */
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__le32 angle; /* orientation in radians relative to x axis -
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actually an IEEE754 float, don't use in kernel */
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__le32 area; /* size in pixels/pressure (?) */
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u8 padding[32];
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} __packed;
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/* combined header/blob data */
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struct sur40_data {
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struct sur40_header header;
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struct sur40_blob blobs[];
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} __packed;
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/* read 512 bytes from endpoint 0x82 -> get header below
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* continue reading 16k blocks until header.size bytes read */
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struct sur40_image_header {
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__le32 magic; /* "SUBF" */
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__le32 packet_id;
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__le32 size; /* always 0x0007e900 = 960x540 */
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__le32 timestamp; /* milliseconds (increases by 16 or 17 each frame) */
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__le32 unknown; /* "epoch?" always 02/03 00 00 00 */
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} __packed;
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/* version information */
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#define DRIVER_SHORT "sur40"
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#define DRIVER_LONG "Samsung SUR40"
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#define DRIVER_AUTHOR "Florian 'floe' Echtler <floe@butterbrot.org>"
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#define DRIVER_DESC "Surface2.0/SUR40/PixelSense input driver"
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/* vendor and device IDs */
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#define ID_MICROSOFT 0x045e
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#define ID_SUR40 0x0775
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/* sensor resolution */
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#define SENSOR_RES_X 1920
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#define SENSOR_RES_Y 1080
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/* touch data endpoint */
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#define TOUCH_ENDPOINT 0x86
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/* video data endpoint */
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#define VIDEO_ENDPOINT 0x82
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/* video header fields */
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#define VIDEO_HEADER_MAGIC 0x46425553
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#define VIDEO_PACKET_SIZE 16384
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/* polling interval (ms) */
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#define POLL_INTERVAL 1
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/* maximum number of contacts FIXME: this is a guess? */
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#define MAX_CONTACTS 64
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/* control commands */
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#define SUR40_GET_VERSION 0xb0 /* 12 bytes string */
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#define SUR40_UNKNOWN1 0xb3 /* 5 bytes */
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#define SUR40_UNKNOWN2 0xc1 /* 24 bytes */
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#define SUR40_GET_STATE 0xc5 /* 4 bytes state (?) */
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#define SUR40_GET_SENSORS 0xb1 /* 8 bytes sensors */
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static const struct v4l2_pix_format sur40_pix_format[] = {
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{
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.pixelformat = V4L2_TCH_FMT_TU08,
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.width = SENSOR_RES_X / 2,
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.height = SENSOR_RES_Y / 2,
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.field = V4L2_FIELD_NONE,
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.colorspace = V4L2_COLORSPACE_SRGB,
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.bytesperline = SENSOR_RES_X / 2,
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.sizeimage = (SENSOR_RES_X/2) * (SENSOR_RES_Y/2),
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},
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{
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.pixelformat = V4L2_PIX_FMT_GREY,
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.width = SENSOR_RES_X / 2,
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.height = SENSOR_RES_Y / 2,
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.field = V4L2_FIELD_NONE,
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.colorspace = V4L2_COLORSPACE_SRGB,
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.bytesperline = SENSOR_RES_X / 2,
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.sizeimage = (SENSOR_RES_X/2) * (SENSOR_RES_Y/2),
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}
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};
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/* master device state */
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struct sur40_state {
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struct usb_device *usbdev;
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struct device *dev;
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struct input_polled_dev *input;
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struct v4l2_device v4l2;
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struct video_device vdev;
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struct mutex lock;
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struct v4l2_pix_format pix_fmt;
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struct vb2_queue queue;
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struct list_head buf_list;
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spinlock_t qlock;
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int sequence;
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struct sur40_data *bulk_in_buffer;
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size_t bulk_in_size;
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u8 bulk_in_epaddr;
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char phys[64];
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};
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struct sur40_buffer {
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struct vb2_v4l2_buffer vb;
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struct list_head list;
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};
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/* forward declarations */
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static const struct video_device sur40_video_device;
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static const struct vb2_queue sur40_queue;
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static void sur40_process_video(struct sur40_state *sur40);
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/*
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* Note: an earlier, non-public version of this driver used USB_RECIP_ENDPOINT
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* here by mistake which is very likely to have corrupted the firmware EEPROM
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* on two separate SUR40 devices. Thanks to Alan Stern who spotted this bug.
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* Should you ever run into a similar problem, the background story to this
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* incident and instructions on how to fix the corrupted EEPROM are available
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* at https://floe.butterbrot.org/matrix/hacking/surface/brick.html
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*/
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/* command wrapper */
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static int sur40_command(struct sur40_state *dev,
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u8 command, u16 index, void *buffer, u16 size)
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{
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return usb_control_msg(dev->usbdev, usb_rcvctrlpipe(dev->usbdev, 0),
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command,
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USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
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0x00, index, buffer, size, 1000);
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}
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/* Initialization routine, called from sur40_open */
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static int sur40_init(struct sur40_state *dev)
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{
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int result;
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u8 *buffer;
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buffer = kmalloc(24, GFP_KERNEL);
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if (!buffer) {
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result = -ENOMEM;
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goto error;
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}
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/* stupidly replay the original MS driver init sequence */
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result = sur40_command(dev, SUR40_GET_VERSION, 0x00, buffer, 12);
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if (result < 0)
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goto error;
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result = sur40_command(dev, SUR40_GET_VERSION, 0x01, buffer, 12);
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if (result < 0)
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goto error;
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result = sur40_command(dev, SUR40_GET_VERSION, 0x02, buffer, 12);
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if (result < 0)
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goto error;
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result = sur40_command(dev, SUR40_UNKNOWN2, 0x00, buffer, 24);
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if (result < 0)
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goto error;
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result = sur40_command(dev, SUR40_UNKNOWN1, 0x00, buffer, 5);
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if (result < 0)
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goto error;
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result = sur40_command(dev, SUR40_GET_VERSION, 0x03, buffer, 12);
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/*
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* Discard the result buffer - no known data inside except
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* some version strings, maybe extract these sometime...
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*/
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error:
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kfree(buffer);
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return result;
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}
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/*
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* Callback routines from input_polled_dev
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*/
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/* Enable the device, polling will now start. */
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static void sur40_open(struct input_polled_dev *polldev)
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{
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struct sur40_state *sur40 = polldev->private;
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dev_dbg(sur40->dev, "open\n");
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sur40_init(sur40);
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}
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/* Disable device, polling has stopped. */
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static void sur40_close(struct input_polled_dev *polldev)
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{
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struct sur40_state *sur40 = polldev->private;
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dev_dbg(sur40->dev, "close\n");
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/*
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* There is no known way to stop the device, so we simply
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* stop polling.
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*/
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}
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/*
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* This function is called when a whole contact has been processed,
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* so that it can assign it to a slot and store the data there.
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*/
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static void sur40_report_blob(struct sur40_blob *blob, struct input_dev *input)
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{
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int wide, major, minor;
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int bb_size_x = le16_to_cpu(blob->bb_size_x);
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int bb_size_y = le16_to_cpu(blob->bb_size_y);
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int pos_x = le16_to_cpu(blob->pos_x);
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int pos_y = le16_to_cpu(blob->pos_y);
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int ctr_x = le16_to_cpu(blob->ctr_x);
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int ctr_y = le16_to_cpu(blob->ctr_y);
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int slotnum = input_mt_get_slot_by_key(input, blob->blob_id);
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if (slotnum < 0 || slotnum >= MAX_CONTACTS)
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return;
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input_mt_slot(input, slotnum);
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input_mt_report_slot_state(input, MT_TOOL_FINGER, 1);
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wide = (bb_size_x > bb_size_y);
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major = max(bb_size_x, bb_size_y);
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minor = min(bb_size_x, bb_size_y);
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input_report_abs(input, ABS_MT_POSITION_X, pos_x);
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input_report_abs(input, ABS_MT_POSITION_Y, pos_y);
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input_report_abs(input, ABS_MT_TOOL_X, ctr_x);
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input_report_abs(input, ABS_MT_TOOL_Y, ctr_y);
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/* TODO: use a better orientation measure */
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input_report_abs(input, ABS_MT_ORIENTATION, wide);
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input_report_abs(input, ABS_MT_TOUCH_MAJOR, major);
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input_report_abs(input, ABS_MT_TOUCH_MINOR, minor);
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}
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/* core function: poll for new input data */
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static void sur40_poll(struct input_polled_dev *polldev)
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{
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struct sur40_state *sur40 = polldev->private;
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struct input_dev *input = polldev->input;
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int result, bulk_read, need_blobs, packet_blobs, i;
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u32 uninitialized_var(packet_id);
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struct sur40_header *header = &sur40->bulk_in_buffer->header;
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struct sur40_blob *inblob = &sur40->bulk_in_buffer->blobs[0];
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dev_dbg(sur40->dev, "poll\n");
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need_blobs = -1;
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do {
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/* perform a blocking bulk read to get data from the device */
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result = usb_bulk_msg(sur40->usbdev,
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usb_rcvbulkpipe(sur40->usbdev, sur40->bulk_in_epaddr),
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sur40->bulk_in_buffer, sur40->bulk_in_size,
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&bulk_read, 1000);
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dev_dbg(sur40->dev, "received %d bytes\n", bulk_read);
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if (result < 0) {
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dev_err(sur40->dev, "error in usb_bulk_read\n");
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return;
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}
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result = bulk_read - sizeof(struct sur40_header);
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if (result % sizeof(struct sur40_blob) != 0) {
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dev_err(sur40->dev, "transfer size mismatch\n");
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return;
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}
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/* first packet? */
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if (need_blobs == -1) {
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need_blobs = le16_to_cpu(header->count);
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dev_dbg(sur40->dev, "need %d blobs\n", need_blobs);
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packet_id = le32_to_cpu(header->packet_id);
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}
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/*
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* Sanity check. when video data is also being retrieved, the
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* packet ID will usually increase in the middle of a series
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* instead of at the end.
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*/
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if (packet_id != header->packet_id)
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dev_dbg(sur40->dev, "packet ID mismatch\n");
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packet_blobs = result / sizeof(struct sur40_blob);
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dev_dbg(sur40->dev, "received %d blobs\n", packet_blobs);
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/* packets always contain at least 4 blobs, even if empty */
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if (packet_blobs > need_blobs)
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packet_blobs = need_blobs;
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for (i = 0; i < packet_blobs; i++) {
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need_blobs--;
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dev_dbg(sur40->dev, "processing blob\n");
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sur40_report_blob(&(inblob[i]), input);
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}
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} while (need_blobs > 0);
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input_mt_sync_frame(input);
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input_sync(input);
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sur40_process_video(sur40);
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}
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/* deal with video data */
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static void sur40_process_video(struct sur40_state *sur40)
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{
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struct sur40_image_header *img = (void *)(sur40->bulk_in_buffer);
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struct sur40_buffer *new_buf;
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struct usb_sg_request sgr;
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struct sg_table *sgt;
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int result, bulk_read;
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if (!vb2_start_streaming_called(&sur40->queue))
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return;
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/* get a new buffer from the list */
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spin_lock(&sur40->qlock);
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if (list_empty(&sur40->buf_list)) {
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dev_dbg(sur40->dev, "buffer queue empty\n");
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spin_unlock(&sur40->qlock);
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return;
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}
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new_buf = list_entry(sur40->buf_list.next, struct sur40_buffer, list);
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list_del(&new_buf->list);
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spin_unlock(&sur40->qlock);
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dev_dbg(sur40->dev, "buffer acquired\n");
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/* retrieve data via bulk read */
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result = usb_bulk_msg(sur40->usbdev,
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usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT),
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sur40->bulk_in_buffer, sur40->bulk_in_size,
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&bulk_read, 1000);
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if (result < 0) {
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dev_err(sur40->dev, "error in usb_bulk_read\n");
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goto err_poll;
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}
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if (bulk_read != sizeof(struct sur40_image_header)) {
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dev_err(sur40->dev, "received %d bytes (%zd expected)\n",
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bulk_read, sizeof(struct sur40_image_header));
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goto err_poll;
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}
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if (le32_to_cpu(img->magic) != VIDEO_HEADER_MAGIC) {
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dev_err(sur40->dev, "image magic mismatch\n");
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goto err_poll;
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}
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if (le32_to_cpu(img->size) != sur40->pix_fmt.sizeimage) {
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dev_err(sur40->dev, "image size mismatch\n");
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goto err_poll;
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}
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dev_dbg(sur40->dev, "header acquired\n");
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sgt = vb2_dma_sg_plane_desc(&new_buf->vb.vb2_buf, 0);
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result = usb_sg_init(&sgr, sur40->usbdev,
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usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT), 0,
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sgt->sgl, sgt->nents, sur40->pix_fmt.sizeimage, 0);
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if (result < 0) {
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dev_err(sur40->dev, "error %d in usb_sg_init\n", result);
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goto err_poll;
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}
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usb_sg_wait(&sgr);
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if (sgr.status < 0) {
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dev_err(sur40->dev, "error %d in usb_sg_wait\n", sgr.status);
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goto err_poll;
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}
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dev_dbg(sur40->dev, "image acquired\n");
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/* return error if streaming was stopped in the meantime */
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if (sur40->sequence == -1)
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return;
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/* mark as finished */
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new_buf->vb.vb2_buf.timestamp = ktime_get_ns();
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new_buf->vb.sequence = sur40->sequence++;
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new_buf->vb.field = V4L2_FIELD_NONE;
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vb2_buffer_done(&new_buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
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dev_dbg(sur40->dev, "buffer marked done\n");
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return;
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err_poll:
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vb2_buffer_done(&new_buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
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}
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/* Initialize input device parameters. */
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static void sur40_input_setup(struct input_dev *input_dev)
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{
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__set_bit(EV_KEY, input_dev->evbit);
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__set_bit(EV_ABS, input_dev->evbit);
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input_set_abs_params(input_dev, ABS_MT_POSITION_X,
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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);
|
|
|
|
input_mt_init_slots(input_dev, MAX_CONTACTS,
|
|
INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
|
|
}
|
|
|
|
/* 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_polled_dev *poll_dev;
|
|
int error;
|
|
|
|
/* Check if we really have the right interface. */
|
|
iface_desc = &interface->altsetting[0];
|
|
if (iface_desc->desc.bInterfaceClass != 0xFF)
|
|
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;
|
|
|
|
poll_dev = input_allocate_polled_device();
|
|
if (!poll_dev) {
|
|
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 polled input device control structure */
|
|
poll_dev->private = sur40;
|
|
poll_dev->poll_interval = POLL_INTERVAL;
|
|
poll_dev->open = sur40_open;
|
|
poll_dev->poll = sur40_poll;
|
|
poll_dev->close = sur40_close;
|
|
|
|
/* Set up regular input device structure */
|
|
sur40_input_setup(poll_dev->input);
|
|
|
|
poll_dev->input->name = DRIVER_LONG;
|
|
usb_to_input_id(usbdev, &poll_dev->input->id);
|
|
usb_make_path(usbdev, sur40->phys, sizeof(sur40->phys));
|
|
strlcat(sur40->phys, "/input0", sizeof(sur40->phys));
|
|
poll_dev->input->phys = sur40->phys;
|
|
poll_dev->input->dev.parent = &interface->dev;
|
|
|
|
sur40->usbdev = usbdev;
|
|
sur40->dev = &interface->dev;
|
|
sur40->input = poll_dev;
|
|
|
|
/* 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_polldev;
|
|
}
|
|
|
|
/* register the polled input device */
|
|
error = input_register_polled_device(poll_dev);
|
|
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);
|
|
|
|
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_polldev:
|
|
input_free_polled_device(sur40->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);
|
|
|
|
video_unregister_device(&sur40->vdev);
|
|
v4l2_device_unregister(&sur40->v4l2);
|
|
|
|
input_unregister_polled_device(sur40->input);
|
|
input_free_polled_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));
|
|
cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TOUCH |
|
|
V4L2_CAP_READWRITE |
|
|
V4L2_CAP_STREAMING;
|
|
cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
|
|
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_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,
|
|
};
|
|
|
|
/* 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");
|