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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Surface2.0/SUR40/PixelSense input driver
0004  *
0005  * Copyright (c) 2014 by Florian 'floe' Echtler <floe@butterbrot.org>
0006  *
0007  * Derived from the USB Skeleton driver 1.1,
0008  * Copyright (c) 2003 Greg Kroah-Hartman (greg@kroah.com)
0009  *
0010  * and from the Apple USB BCM5974 multitouch driver,
0011  * Copyright (c) 2008 Henrik Rydberg (rydberg@euromail.se)
0012  *
0013  * and from the generic hid-multitouch driver,
0014  * Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr>
0015  *
0016  * and from the v4l2-pci-skeleton driver,
0017  * Copyright (c) Copyright 2014 Cisco Systems, Inc.
0018  */
0019 
0020 #include <linux/kernel.h>
0021 #include <linux/errno.h>
0022 #include <linux/delay.h>
0023 #include <linux/init.h>
0024 #include <linux/slab.h>
0025 #include <linux/module.h>
0026 #include <linux/completion.h>
0027 #include <linux/uaccess.h>
0028 #include <linux/usb.h>
0029 #include <linux/printk.h>
0030 #include <linux/input.h>
0031 #include <linux/input/mt.h>
0032 #include <linux/usb/input.h>
0033 #include <linux/videodev2.h>
0034 #include <media/v4l2-device.h>
0035 #include <media/v4l2-dev.h>
0036 #include <media/v4l2-ioctl.h>
0037 #include <media/v4l2-ctrls.h>
0038 #include <media/videobuf2-v4l2.h>
0039 #include <media/videobuf2-dma-sg.h>
0040 
0041 /* read 512 bytes from endpoint 0x86 -> get header + blobs */
0042 struct sur40_header {
0043 
0044     __le16 type;       /* always 0x0001 */
0045     __le16 count;      /* count of blobs (if 0: continue prev. packet) */
0046 
0047     __le32 packet_id;  /* unique ID for all packets in one frame */
0048 
0049     __le32 timestamp;  /* milliseconds (inc. by 16 or 17 each frame) */
0050     __le32 unknown;    /* "epoch?" always 02/03 00 00 00 */
0051 
0052 } __packed;
0053 
0054 struct sur40_blob {
0055 
0056     __le16 blob_id;
0057 
0058     u8 action;         /* 0x02 = enter/exit, 0x03 = update (?) */
0059     u8 type;           /* bitmask (0x01 blob,  0x02 touch, 0x04 tag) */
0060 
0061     __le16 bb_pos_x;   /* upper left corner of bounding box */
0062     __le16 bb_pos_y;
0063 
0064     __le16 bb_size_x;  /* size of bounding box */
0065     __le16 bb_size_y;
0066 
0067     __le16 pos_x;      /* finger tip position */
0068     __le16 pos_y;
0069 
0070     __le16 ctr_x;      /* centroid position */
0071     __le16 ctr_y;
0072 
0073     __le16 axis_x;     /* somehow related to major/minor axis, mostly: */
0074     __le16 axis_y;     /* axis_x == bb_size_y && axis_y == bb_size_x */
0075 
0076     __le32 angle;      /* orientation in radians relative to x axis -
0077                           actually an IEEE754 float, don't use in kernel */
0078 
0079     __le32 area;       /* size in pixels/pressure (?) */
0080 
0081     u8 padding[24];
0082 
0083     __le32 tag_id;     /* valid when type == 0x04 (SUR40_TAG) */
0084     __le32 unknown;
0085 
0086 } __packed;
0087 
0088 /* combined header/blob data */
0089 struct sur40_data {
0090     struct sur40_header header;
0091     struct sur40_blob   blobs[];
0092 } __packed;
0093 
0094 /* read 512 bytes from endpoint 0x82 -> get header below
0095  * continue reading 16k blocks until header.size bytes read */
0096 struct sur40_image_header {
0097     __le32 magic;     /* "SUBF" */
0098     __le32 packet_id;
0099     __le32 size;      /* always 0x0007e900 = 960x540 */
0100     __le32 timestamp; /* milliseconds (increases by 16 or 17 each frame) */
0101     __le32 unknown;   /* "epoch?" always 02/03 00 00 00 */
0102 } __packed;
0103 
0104 /* version information */
0105 #define DRIVER_SHORT   "sur40"
0106 #define DRIVER_LONG    "Samsung SUR40"
0107 #define DRIVER_AUTHOR  "Florian 'floe' Echtler <floe@butterbrot.org>"
0108 #define DRIVER_DESC    "Surface2.0/SUR40/PixelSense input driver"
0109 
0110 /* vendor and device IDs */
0111 #define ID_MICROSOFT 0x045e
0112 #define ID_SUR40     0x0775
0113 
0114 /* sensor resolution */
0115 #define SENSOR_RES_X 1920
0116 #define SENSOR_RES_Y 1080
0117 
0118 /* touch data endpoint */
0119 #define TOUCH_ENDPOINT 0x86
0120 
0121 /* video data endpoint */
0122 #define VIDEO_ENDPOINT 0x82
0123 
0124 /* video header fields */
0125 #define VIDEO_HEADER_MAGIC 0x46425553
0126 #define VIDEO_PACKET_SIZE  16384
0127 
0128 /* polling interval (ms) */
0129 #define POLL_INTERVAL 1
0130 
0131 /* maximum number of contacts FIXME: this is a guess? */
0132 #define MAX_CONTACTS 64
0133 
0134 /* control commands */
0135 #define SUR40_GET_VERSION 0xb0 /* 12 bytes string    */
0136 #define SUR40_ACCEL_CAPS  0xb3 /*  5 bytes           */
0137 #define SUR40_SENSOR_CAPS 0xc1 /* 24 bytes           */
0138 
0139 #define SUR40_POKE        0xc5 /* poke register byte */
0140 #define SUR40_PEEK        0xc4 /* 48 bytes registers */
0141 
0142 #define SUR40_GET_STATE   0xc5 /*  4 bytes state (?) */
0143 #define SUR40_GET_SENSORS 0xb1 /*  8 bytes sensors   */
0144 
0145 #define SUR40_BLOB  0x01
0146 #define SUR40_TOUCH 0x02
0147 #define SUR40_TAG   0x04
0148 
0149 /* video controls */
0150 #define SUR40_BRIGHTNESS_MAX 0xff
0151 #define SUR40_BRIGHTNESS_MIN 0x00
0152 #define SUR40_BRIGHTNESS_DEF 0xff
0153 
0154 #define SUR40_CONTRAST_MAX 0x0f
0155 #define SUR40_CONTRAST_MIN 0x00
0156 #define SUR40_CONTRAST_DEF 0x0a
0157 
0158 #define SUR40_GAIN_MAX 0x09
0159 #define SUR40_GAIN_MIN 0x00
0160 #define SUR40_GAIN_DEF 0x08
0161 
0162 #define SUR40_BACKLIGHT_MAX 0x01
0163 #define SUR40_BACKLIGHT_MIN 0x00
0164 #define SUR40_BACKLIGHT_DEF 0x01
0165 
0166 #define sur40_str(s) #s
0167 #define SUR40_PARAM_RANGE(lo, hi) " (range " sur40_str(lo) "-" sur40_str(hi) ")"
0168 
0169 /* module parameters */
0170 static uint brightness = SUR40_BRIGHTNESS_DEF;
0171 module_param(brightness, uint, 0644);
0172 MODULE_PARM_DESC(brightness, "set initial brightness"
0173     SUR40_PARAM_RANGE(SUR40_BRIGHTNESS_MIN, SUR40_BRIGHTNESS_MAX));
0174 static uint contrast = SUR40_CONTRAST_DEF;
0175 module_param(contrast, uint, 0644);
0176 MODULE_PARM_DESC(contrast, "set initial contrast"
0177     SUR40_PARAM_RANGE(SUR40_CONTRAST_MIN, SUR40_CONTRAST_MAX));
0178 static uint gain = SUR40_GAIN_DEF;
0179 module_param(gain, uint, 0644);
0180 MODULE_PARM_DESC(gain, "set initial gain"
0181     SUR40_PARAM_RANGE(SUR40_GAIN_MIN, SUR40_GAIN_MAX));
0182 
0183 static const struct v4l2_pix_format sur40_pix_format[] = {
0184     {
0185         .pixelformat = V4L2_TCH_FMT_TU08,
0186         .width  = SENSOR_RES_X / 2,
0187         .height = SENSOR_RES_Y / 2,
0188         .field = V4L2_FIELD_NONE,
0189         .colorspace = V4L2_COLORSPACE_RAW,
0190         .bytesperline = SENSOR_RES_X / 2,
0191         .sizeimage = (SENSOR_RES_X/2) * (SENSOR_RES_Y/2),
0192     },
0193     {
0194         .pixelformat = V4L2_PIX_FMT_GREY,
0195         .width  = SENSOR_RES_X / 2,
0196         .height = SENSOR_RES_Y / 2,
0197         .field = V4L2_FIELD_NONE,
0198         .colorspace = V4L2_COLORSPACE_RAW,
0199         .bytesperline = SENSOR_RES_X / 2,
0200         .sizeimage = (SENSOR_RES_X/2) * (SENSOR_RES_Y/2),
0201     }
0202 };
0203 
0204 /* master device state */
0205 struct sur40_state {
0206 
0207     struct usb_device *usbdev;
0208     struct device *dev;
0209     struct input_dev *input;
0210 
0211     struct v4l2_device v4l2;
0212     struct video_device vdev;
0213     struct mutex lock;
0214     struct v4l2_pix_format pix_fmt;
0215     struct v4l2_ctrl_handler hdl;
0216 
0217     struct vb2_queue queue;
0218     struct list_head buf_list;
0219     spinlock_t qlock;
0220     int sequence;
0221 
0222     struct sur40_data *bulk_in_buffer;
0223     size_t bulk_in_size;
0224     u8 bulk_in_epaddr;
0225     u8 vsvideo;
0226 
0227     char phys[64];
0228 };
0229 
0230 struct sur40_buffer {
0231     struct vb2_v4l2_buffer vb;
0232     struct list_head list;
0233 };
0234 
0235 /* forward declarations */
0236 static const struct video_device sur40_video_device;
0237 static const struct vb2_queue sur40_queue;
0238 static void sur40_process_video(struct sur40_state *sur40);
0239 static int sur40_s_ctrl(struct v4l2_ctrl *ctrl);
0240 
0241 static const struct v4l2_ctrl_ops sur40_ctrl_ops = {
0242     .s_ctrl = sur40_s_ctrl,
0243 };
0244 
0245 /*
0246  * Note: an earlier, non-public version of this driver used USB_RECIP_ENDPOINT
0247  * here by mistake which is very likely to have corrupted the firmware EEPROM
0248  * on two separate SUR40 devices. Thanks to Alan Stern who spotted this bug.
0249  * Should you ever run into a similar problem, the background story to this
0250  * incident and instructions on how to fix the corrupted EEPROM are available
0251  * at https://floe.butterbrot.org/matrix/hacking/surface/brick.html
0252 */
0253 
0254 /* command wrapper */
0255 static int sur40_command(struct sur40_state *dev,
0256              u8 command, u16 index, void *buffer, u16 size)
0257 {
0258     return usb_control_msg(dev->usbdev, usb_rcvctrlpipe(dev->usbdev, 0),
0259                    command,
0260                    USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
0261                    0x00, index, buffer, size, 1000);
0262 }
0263 
0264 /* poke a byte in the panel register space */
0265 static int sur40_poke(struct sur40_state *dev, u8 offset, u8 value)
0266 {
0267     int result;
0268     u8 index = 0x96; // 0xae for permanent write
0269 
0270     result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
0271         SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
0272         0x32, index, NULL, 0, 1000);
0273     if (result < 0)
0274         goto error;
0275     msleep(5);
0276 
0277     result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
0278         SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
0279         0x72, offset, NULL, 0, 1000);
0280     if (result < 0)
0281         goto error;
0282     msleep(5);
0283 
0284     result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
0285         SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
0286         0xb2, value, NULL, 0, 1000);
0287     if (result < 0)
0288         goto error;
0289     msleep(5);
0290 
0291 error:
0292     return result;
0293 }
0294 
0295 static int sur40_set_preprocessor(struct sur40_state *dev, u8 value)
0296 {
0297     u8 setting_07[2] = { 0x01, 0x00 };
0298     u8 setting_17[2] = { 0x85, 0x80 };
0299     int result;
0300 
0301     if (value > 1)
0302         return -ERANGE;
0303 
0304     result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
0305         SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
0306         0x07, setting_07[value], NULL, 0, 1000);
0307     if (result < 0)
0308         goto error;
0309     msleep(5);
0310 
0311     result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
0312         SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
0313         0x17, setting_17[value], NULL, 0, 1000);
0314     if (result < 0)
0315         goto error;
0316     msleep(5);
0317 
0318 error:
0319     return result;
0320 }
0321 
0322 static void sur40_set_vsvideo(struct sur40_state *handle, u8 value)
0323 {
0324     int i;
0325 
0326     for (i = 0; i < 4; i++)
0327         sur40_poke(handle, 0x1c+i, value);
0328     handle->vsvideo = value;
0329 }
0330 
0331 static void sur40_set_irlevel(struct sur40_state *handle, u8 value)
0332 {
0333     int i;
0334 
0335     for (i = 0; i < 8; i++)
0336         sur40_poke(handle, 0x08+(2*i), value);
0337 }
0338 
0339 /* Initialization routine, called from sur40_open */
0340 static int sur40_init(struct sur40_state *dev)
0341 {
0342     int result;
0343     u8 *buffer;
0344 
0345     buffer = kmalloc(24, GFP_KERNEL);
0346     if (!buffer) {
0347         result = -ENOMEM;
0348         goto error;
0349     }
0350 
0351     /* stupidly replay the original MS driver init sequence */
0352     result = sur40_command(dev, SUR40_GET_VERSION, 0x00, buffer, 12);
0353     if (result < 0)
0354         goto error;
0355 
0356     result = sur40_command(dev, SUR40_GET_VERSION, 0x01, buffer, 12);
0357     if (result < 0)
0358         goto error;
0359 
0360     result = sur40_command(dev, SUR40_GET_VERSION, 0x02, buffer, 12);
0361     if (result < 0)
0362         goto error;
0363 
0364     result = sur40_command(dev, SUR40_SENSOR_CAPS, 0x00, buffer, 24);
0365     if (result < 0)
0366         goto error;
0367 
0368     result = sur40_command(dev, SUR40_ACCEL_CAPS, 0x00, buffer, 5);
0369     if (result < 0)
0370         goto error;
0371 
0372     result = sur40_command(dev, SUR40_GET_VERSION, 0x03, buffer, 12);
0373     if (result < 0)
0374         goto error;
0375 
0376     result = 0;
0377 
0378     /*
0379      * Discard the result buffer - no known data inside except
0380      * some version strings, maybe extract these sometime...
0381      */
0382 error:
0383     kfree(buffer);
0384     return result;
0385 }
0386 
0387 /*
0388  * Callback routines from input_dev
0389  */
0390 
0391 /* Enable the device, polling will now start. */
0392 static int sur40_open(struct input_dev *input)
0393 {
0394     struct sur40_state *sur40 = input_get_drvdata(input);
0395 
0396     dev_dbg(sur40->dev, "open\n");
0397     return sur40_init(sur40);
0398 }
0399 
0400 /* Disable device, polling has stopped. */
0401 static void sur40_close(struct input_dev *input)
0402 {
0403     struct sur40_state *sur40 = input_get_drvdata(input);
0404 
0405     dev_dbg(sur40->dev, "close\n");
0406     /*
0407      * There is no known way to stop the device, so we simply
0408      * stop polling.
0409      */
0410 }
0411 
0412 /*
0413  * This function is called when a whole contact has been processed,
0414  * so that it can assign it to a slot and store the data there.
0415  */
0416 static void sur40_report_blob(struct sur40_blob *blob, struct input_dev *input)
0417 {
0418     int wide, major, minor;
0419     int bb_size_x, bb_size_y, pos_x, pos_y, ctr_x, ctr_y, slotnum;
0420 
0421     if (blob->type != SUR40_TOUCH)
0422         return;
0423 
0424     slotnum = input_mt_get_slot_by_key(input, blob->blob_id);
0425     if (slotnum < 0 || slotnum >= MAX_CONTACTS)
0426         return;
0427 
0428     bb_size_x = le16_to_cpu(blob->bb_size_x);
0429     bb_size_y = le16_to_cpu(blob->bb_size_y);
0430 
0431     pos_x = le16_to_cpu(blob->pos_x);
0432     pos_y = le16_to_cpu(blob->pos_y);
0433 
0434     ctr_x = le16_to_cpu(blob->ctr_x);
0435     ctr_y = le16_to_cpu(blob->ctr_y);
0436 
0437     input_mt_slot(input, slotnum);
0438     input_mt_report_slot_state(input, MT_TOOL_FINGER, 1);
0439     wide = (bb_size_x > bb_size_y);
0440     major = max(bb_size_x, bb_size_y);
0441     minor = min(bb_size_x, bb_size_y);
0442 
0443     input_report_abs(input, ABS_MT_POSITION_X, pos_x);
0444     input_report_abs(input, ABS_MT_POSITION_Y, pos_y);
0445     input_report_abs(input, ABS_MT_TOOL_X, ctr_x);
0446     input_report_abs(input, ABS_MT_TOOL_Y, ctr_y);
0447 
0448     /* TODO: use a better orientation measure */
0449     input_report_abs(input, ABS_MT_ORIENTATION, wide);
0450     input_report_abs(input, ABS_MT_TOUCH_MAJOR, major);
0451     input_report_abs(input, ABS_MT_TOUCH_MINOR, minor);
0452 }
0453 
0454 /* core function: poll for new input data */
0455 static void sur40_poll(struct input_dev *input)
0456 {
0457     struct sur40_state *sur40 = input_get_drvdata(input);
0458     int result, bulk_read, need_blobs, packet_blobs, i;
0459     struct sur40_header *header = &sur40->bulk_in_buffer->header;
0460     struct sur40_blob *inblob = &sur40->bulk_in_buffer->blobs[0];
0461 
0462     dev_dbg(sur40->dev, "poll\n");
0463 
0464     need_blobs = -1;
0465 
0466     do {
0467 
0468         /* perform a blocking bulk read to get data from the device */
0469         result = usb_bulk_msg(sur40->usbdev,
0470             usb_rcvbulkpipe(sur40->usbdev, sur40->bulk_in_epaddr),
0471             sur40->bulk_in_buffer, sur40->bulk_in_size,
0472             &bulk_read, 1000);
0473 
0474         dev_dbg(sur40->dev, "received %d bytes\n", bulk_read);
0475 
0476         if (result < 0) {
0477             dev_err(sur40->dev, "error in usb_bulk_read\n");
0478             return;
0479         }
0480 
0481         result = bulk_read - sizeof(struct sur40_header);
0482 
0483         if (result % sizeof(struct sur40_blob) != 0) {
0484             dev_err(sur40->dev, "transfer size mismatch\n");
0485             return;
0486         }
0487 
0488         /* first packet? */
0489         if (need_blobs == -1) {
0490             need_blobs = le16_to_cpu(header->count);
0491             dev_dbg(sur40->dev, "need %d blobs\n", need_blobs);
0492             /* packet_id = le32_to_cpu(header->packet_id); */
0493         }
0494 
0495         /*
0496          * Sanity check. when video data is also being retrieved, the
0497          * packet ID will usually increase in the middle of a series
0498          * instead of at the end. However, the data is still consistent,
0499          * so the packet ID is probably just valid for the first packet
0500          * in a series.
0501 
0502         if (packet_id != le32_to_cpu(header->packet_id))
0503             dev_dbg(sur40->dev, "packet ID mismatch\n");
0504          */
0505 
0506         packet_blobs = result / sizeof(struct sur40_blob);
0507         dev_dbg(sur40->dev, "received %d blobs\n", packet_blobs);
0508 
0509         /* packets always contain at least 4 blobs, even if empty */
0510         if (packet_blobs > need_blobs)
0511             packet_blobs = need_blobs;
0512 
0513         for (i = 0; i < packet_blobs; i++) {
0514             need_blobs--;
0515             dev_dbg(sur40->dev, "processing blob\n");
0516             sur40_report_blob(&(inblob[i]), input);
0517         }
0518 
0519     } while (need_blobs > 0);
0520 
0521     input_mt_sync_frame(input);
0522     input_sync(input);
0523 
0524     sur40_process_video(sur40);
0525 }
0526 
0527 /* deal with video data */
0528 static void sur40_process_video(struct sur40_state *sur40)
0529 {
0530 
0531     struct sur40_image_header *img = (void *)(sur40->bulk_in_buffer);
0532     struct sur40_buffer *new_buf;
0533     struct usb_sg_request sgr;
0534     struct sg_table *sgt;
0535     int result, bulk_read;
0536 
0537     if (!vb2_start_streaming_called(&sur40->queue))
0538         return;
0539 
0540     /* get a new buffer from the list */
0541     spin_lock(&sur40->qlock);
0542     if (list_empty(&sur40->buf_list)) {
0543         dev_dbg(sur40->dev, "buffer queue empty\n");
0544         spin_unlock(&sur40->qlock);
0545         return;
0546     }
0547     new_buf = list_entry(sur40->buf_list.next, struct sur40_buffer, list);
0548     list_del(&new_buf->list);
0549     spin_unlock(&sur40->qlock);
0550 
0551     dev_dbg(sur40->dev, "buffer acquired\n");
0552 
0553     /* retrieve data via bulk read */
0554     result = usb_bulk_msg(sur40->usbdev,
0555             usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT),
0556             sur40->bulk_in_buffer, sur40->bulk_in_size,
0557             &bulk_read, 1000);
0558 
0559     if (result < 0) {
0560         dev_err(sur40->dev, "error in usb_bulk_read\n");
0561         goto err_poll;
0562     }
0563 
0564     if (bulk_read != sizeof(struct sur40_image_header)) {
0565         dev_err(sur40->dev, "received %d bytes (%zd expected)\n",
0566             bulk_read, sizeof(struct sur40_image_header));
0567         goto err_poll;
0568     }
0569 
0570     if (le32_to_cpu(img->magic) != VIDEO_HEADER_MAGIC) {
0571         dev_err(sur40->dev, "image magic mismatch\n");
0572         goto err_poll;
0573     }
0574 
0575     if (le32_to_cpu(img->size) != sur40->pix_fmt.sizeimage) {
0576         dev_err(sur40->dev, "image size mismatch\n");
0577         goto err_poll;
0578     }
0579 
0580     dev_dbg(sur40->dev, "header acquired\n");
0581 
0582     sgt = vb2_dma_sg_plane_desc(&new_buf->vb.vb2_buf, 0);
0583 
0584     result = usb_sg_init(&sgr, sur40->usbdev,
0585         usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT), 0,
0586         sgt->sgl, sgt->nents, sur40->pix_fmt.sizeimage, 0);
0587     if (result < 0) {
0588         dev_err(sur40->dev, "error %d in usb_sg_init\n", result);
0589         goto err_poll;
0590     }
0591 
0592     usb_sg_wait(&sgr);
0593     if (sgr.status < 0) {
0594         dev_err(sur40->dev, "error %d in usb_sg_wait\n", sgr.status);
0595         goto err_poll;
0596     }
0597 
0598     dev_dbg(sur40->dev, "image acquired\n");
0599 
0600     /* return error if streaming was stopped in the meantime */
0601     if (sur40->sequence == -1)
0602         return;
0603 
0604     /* mark as finished */
0605     new_buf->vb.vb2_buf.timestamp = ktime_get_ns();
0606     new_buf->vb.sequence = sur40->sequence++;
0607     new_buf->vb.field = V4L2_FIELD_NONE;
0608     vb2_buffer_done(&new_buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
0609     dev_dbg(sur40->dev, "buffer marked done\n");
0610     return;
0611 
0612 err_poll:
0613     vb2_buffer_done(&new_buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
0614 }
0615 
0616 /* Initialize input device parameters. */
0617 static int sur40_input_setup_events(struct input_dev *input_dev)
0618 {
0619     int error;
0620 
0621     input_set_abs_params(input_dev, ABS_MT_POSITION_X,
0622                  0, SENSOR_RES_X, 0, 0);
0623     input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
0624                  0, SENSOR_RES_Y, 0, 0);
0625 
0626     input_set_abs_params(input_dev, ABS_MT_TOOL_X,
0627                  0, SENSOR_RES_X, 0, 0);
0628     input_set_abs_params(input_dev, ABS_MT_TOOL_Y,
0629                  0, SENSOR_RES_Y, 0, 0);
0630 
0631     /* max value unknown, but major/minor axis
0632      * can never be larger than screen */
0633     input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
0634                  0, SENSOR_RES_X, 0, 0);
0635     input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR,
0636                  0, SENSOR_RES_Y, 0, 0);
0637 
0638     input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0);
0639 
0640     error = input_mt_init_slots(input_dev, MAX_CONTACTS,
0641                     INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
0642     if (error) {
0643         dev_err(input_dev->dev.parent, "failed to set up slots\n");
0644         return error;
0645     }
0646 
0647     return 0;
0648 }
0649 
0650 /* Check candidate USB interface. */
0651 static int sur40_probe(struct usb_interface *interface,
0652                const struct usb_device_id *id)
0653 {
0654     struct usb_device *usbdev = interface_to_usbdev(interface);
0655     struct sur40_state *sur40;
0656     struct usb_host_interface *iface_desc;
0657     struct usb_endpoint_descriptor *endpoint;
0658     struct input_dev *input;
0659     int error;
0660 
0661     /* Check if we really have the right interface. */
0662     iface_desc = interface->cur_altsetting;
0663     if (iface_desc->desc.bInterfaceClass != 0xFF)
0664         return -ENODEV;
0665 
0666     if (iface_desc->desc.bNumEndpoints < 5)
0667         return -ENODEV;
0668 
0669     /* Use endpoint #4 (0x86). */
0670     endpoint = &iface_desc->endpoint[4].desc;
0671     if (endpoint->bEndpointAddress != TOUCH_ENDPOINT)
0672         return -ENODEV;
0673 
0674     /* Allocate memory for our device state and initialize it. */
0675     sur40 = kzalloc(sizeof(struct sur40_state), GFP_KERNEL);
0676     if (!sur40)
0677         return -ENOMEM;
0678 
0679     input = input_allocate_device();
0680     if (!input) {
0681         error = -ENOMEM;
0682         goto err_free_dev;
0683     }
0684 
0685     /* initialize locks/lists */
0686     INIT_LIST_HEAD(&sur40->buf_list);
0687     spin_lock_init(&sur40->qlock);
0688     mutex_init(&sur40->lock);
0689 
0690     /* Set up regular input device structure */
0691     input->name = DRIVER_LONG;
0692     usb_to_input_id(usbdev, &input->id);
0693     usb_make_path(usbdev, sur40->phys, sizeof(sur40->phys));
0694     strlcat(sur40->phys, "/input0", sizeof(sur40->phys));
0695     input->phys = sur40->phys;
0696     input->dev.parent = &interface->dev;
0697 
0698     input->open = sur40_open;
0699     input->close = sur40_close;
0700 
0701     error = sur40_input_setup_events(input);
0702     if (error)
0703         goto err_free_input;
0704 
0705     input_set_drvdata(input, sur40);
0706     error = input_setup_polling(input, sur40_poll);
0707     if (error) {
0708         dev_err(&interface->dev, "failed to set up polling");
0709         goto err_free_input;
0710     }
0711 
0712     input_set_poll_interval(input, POLL_INTERVAL);
0713 
0714     sur40->usbdev = usbdev;
0715     sur40->dev = &interface->dev;
0716     sur40->input = input;
0717 
0718     /* use the bulk-in endpoint tested above */
0719     sur40->bulk_in_size = usb_endpoint_maxp(endpoint);
0720     sur40->bulk_in_epaddr = endpoint->bEndpointAddress;
0721     sur40->bulk_in_buffer = kmalloc(sur40->bulk_in_size, GFP_KERNEL);
0722     if (!sur40->bulk_in_buffer) {
0723         dev_err(&interface->dev, "Unable to allocate input buffer.");
0724         error = -ENOMEM;
0725         goto err_free_input;
0726     }
0727 
0728     /* register the polled input device */
0729     error = input_register_device(input);
0730     if (error) {
0731         dev_err(&interface->dev,
0732             "Unable to register polled input device.");
0733         goto err_free_buffer;
0734     }
0735 
0736     /* register the video master device */
0737     snprintf(sur40->v4l2.name, sizeof(sur40->v4l2.name), "%s", DRIVER_LONG);
0738     error = v4l2_device_register(sur40->dev, &sur40->v4l2);
0739     if (error) {
0740         dev_err(&interface->dev,
0741             "Unable to register video master device.");
0742         goto err_unreg_v4l2;
0743     }
0744 
0745     /* initialize the lock and subdevice */
0746     sur40->queue = sur40_queue;
0747     sur40->queue.drv_priv = sur40;
0748     sur40->queue.lock = &sur40->lock;
0749     sur40->queue.dev = sur40->dev;
0750 
0751     /* initialize the queue */
0752     error = vb2_queue_init(&sur40->queue);
0753     if (error)
0754         goto err_unreg_v4l2;
0755 
0756     sur40->pix_fmt = sur40_pix_format[0];
0757     sur40->vdev = sur40_video_device;
0758     sur40->vdev.v4l2_dev = &sur40->v4l2;
0759     sur40->vdev.lock = &sur40->lock;
0760     sur40->vdev.queue = &sur40->queue;
0761     video_set_drvdata(&sur40->vdev, sur40);
0762 
0763     /* initialize the control handler for 4 controls */
0764     v4l2_ctrl_handler_init(&sur40->hdl, 4);
0765     sur40->v4l2.ctrl_handler = &sur40->hdl;
0766     sur40->vsvideo = (SUR40_CONTRAST_DEF << 4) | SUR40_GAIN_DEF;
0767 
0768     v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops, V4L2_CID_BRIGHTNESS,
0769       SUR40_BRIGHTNESS_MIN, SUR40_BRIGHTNESS_MAX, 1, clamp(brightness,
0770       (uint)SUR40_BRIGHTNESS_MIN, (uint)SUR40_BRIGHTNESS_MAX));
0771 
0772     v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops, V4L2_CID_CONTRAST,
0773       SUR40_CONTRAST_MIN, SUR40_CONTRAST_MAX, 1, clamp(contrast,
0774       (uint)SUR40_CONTRAST_MIN, (uint)SUR40_CONTRAST_MAX));
0775 
0776     v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops, V4L2_CID_GAIN,
0777       SUR40_GAIN_MIN, SUR40_GAIN_MAX, 1, clamp(gain,
0778       (uint)SUR40_GAIN_MIN, (uint)SUR40_GAIN_MAX));
0779 
0780     v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops,
0781       V4L2_CID_BACKLIGHT_COMPENSATION, SUR40_BACKLIGHT_MIN,
0782       SUR40_BACKLIGHT_MAX, 1, SUR40_BACKLIGHT_DEF);
0783 
0784     v4l2_ctrl_handler_setup(&sur40->hdl);
0785 
0786     if (sur40->hdl.error) {
0787         dev_err(&interface->dev,
0788             "Unable to register video controls.");
0789         v4l2_ctrl_handler_free(&sur40->hdl);
0790         error = sur40->hdl.error;
0791         goto err_unreg_v4l2;
0792     }
0793 
0794     error = video_register_device(&sur40->vdev, VFL_TYPE_TOUCH, -1);
0795     if (error) {
0796         dev_err(&interface->dev,
0797             "Unable to register video subdevice.");
0798         goto err_unreg_video;
0799     }
0800 
0801     /* we can register the device now, as it is ready */
0802     usb_set_intfdata(interface, sur40);
0803     dev_dbg(&interface->dev, "%s is now attached\n", DRIVER_DESC);
0804 
0805     return 0;
0806 
0807 err_unreg_video:
0808     video_unregister_device(&sur40->vdev);
0809 err_unreg_v4l2:
0810     v4l2_device_unregister(&sur40->v4l2);
0811 err_free_buffer:
0812     kfree(sur40->bulk_in_buffer);
0813 err_free_input:
0814     input_free_device(input);
0815 err_free_dev:
0816     kfree(sur40);
0817 
0818     return error;
0819 }
0820 
0821 /* Unregister device & clean up. */
0822 static void sur40_disconnect(struct usb_interface *interface)
0823 {
0824     struct sur40_state *sur40 = usb_get_intfdata(interface);
0825 
0826     v4l2_ctrl_handler_free(&sur40->hdl);
0827     video_unregister_device(&sur40->vdev);
0828     v4l2_device_unregister(&sur40->v4l2);
0829 
0830     input_unregister_device(sur40->input);
0831     kfree(sur40->bulk_in_buffer);
0832     kfree(sur40);
0833 
0834     usb_set_intfdata(interface, NULL);
0835     dev_dbg(&interface->dev, "%s is now disconnected\n", DRIVER_DESC);
0836 }
0837 
0838 /*
0839  * Setup the constraints of the queue: besides setting the number of planes
0840  * per buffer and the size and allocation context of each plane, it also
0841  * checks if sufficient buffers have been allocated. Usually 3 is a good
0842  * minimum number: many DMA engines need a minimum of 2 buffers in the
0843  * queue and you need to have another available for userspace processing.
0844  */
0845 static int sur40_queue_setup(struct vb2_queue *q,
0846                unsigned int *nbuffers, unsigned int *nplanes,
0847                unsigned int sizes[], struct device *alloc_devs[])
0848 {
0849     struct sur40_state *sur40 = vb2_get_drv_priv(q);
0850 
0851     if (q->num_buffers + *nbuffers < 3)
0852         *nbuffers = 3 - q->num_buffers;
0853 
0854     if (*nplanes)
0855         return sizes[0] < sur40->pix_fmt.sizeimage ? -EINVAL : 0;
0856 
0857     *nplanes = 1;
0858     sizes[0] = sur40->pix_fmt.sizeimage;
0859 
0860     return 0;
0861 }
0862 
0863 /*
0864  * Prepare the buffer for queueing to the DMA engine: check and set the
0865  * payload size.
0866  */
0867 static int sur40_buffer_prepare(struct vb2_buffer *vb)
0868 {
0869     struct sur40_state *sur40 = vb2_get_drv_priv(vb->vb2_queue);
0870     unsigned long size = sur40->pix_fmt.sizeimage;
0871 
0872     if (vb2_plane_size(vb, 0) < size) {
0873         dev_err(&sur40->usbdev->dev, "buffer too small (%lu < %lu)\n",
0874              vb2_plane_size(vb, 0), size);
0875         return -EINVAL;
0876     }
0877 
0878     vb2_set_plane_payload(vb, 0, size);
0879     return 0;
0880 }
0881 
0882 /*
0883  * Queue this buffer to the DMA engine.
0884  */
0885 static void sur40_buffer_queue(struct vb2_buffer *vb)
0886 {
0887     struct sur40_state *sur40 = vb2_get_drv_priv(vb->vb2_queue);
0888     struct sur40_buffer *buf = (struct sur40_buffer *)vb;
0889 
0890     spin_lock(&sur40->qlock);
0891     list_add_tail(&buf->list, &sur40->buf_list);
0892     spin_unlock(&sur40->qlock);
0893 }
0894 
0895 static void return_all_buffers(struct sur40_state *sur40,
0896                    enum vb2_buffer_state state)
0897 {
0898     struct sur40_buffer *buf, *node;
0899 
0900     spin_lock(&sur40->qlock);
0901     list_for_each_entry_safe(buf, node, &sur40->buf_list, list) {
0902         vb2_buffer_done(&buf->vb.vb2_buf, state);
0903         list_del(&buf->list);
0904     }
0905     spin_unlock(&sur40->qlock);
0906 }
0907 
0908 /*
0909  * Start streaming. First check if the minimum number of buffers have been
0910  * queued. If not, then return -ENOBUFS and the vb2 framework will call
0911  * this function again the next time a buffer has been queued until enough
0912  * buffers are available to actually start the DMA engine.
0913  */
0914 static int sur40_start_streaming(struct vb2_queue *vq, unsigned int count)
0915 {
0916     struct sur40_state *sur40 = vb2_get_drv_priv(vq);
0917 
0918     sur40->sequence = 0;
0919     return 0;
0920 }
0921 
0922 /*
0923  * Stop the DMA engine. Any remaining buffers in the DMA queue are dequeued
0924  * and passed on to the vb2 framework marked as STATE_ERROR.
0925  */
0926 static void sur40_stop_streaming(struct vb2_queue *vq)
0927 {
0928     struct sur40_state *sur40 = vb2_get_drv_priv(vq);
0929     vb2_wait_for_all_buffers(vq);
0930     sur40->sequence = -1;
0931 
0932     /* Release all active buffers */
0933     return_all_buffers(sur40, VB2_BUF_STATE_ERROR);
0934 }
0935 
0936 /* V4L ioctl */
0937 static int sur40_vidioc_querycap(struct file *file, void *priv,
0938                  struct v4l2_capability *cap)
0939 {
0940     struct sur40_state *sur40 = video_drvdata(file);
0941 
0942     strlcpy(cap->driver, DRIVER_SHORT, sizeof(cap->driver));
0943     strlcpy(cap->card, DRIVER_LONG, sizeof(cap->card));
0944     usb_make_path(sur40->usbdev, cap->bus_info, sizeof(cap->bus_info));
0945     return 0;
0946 }
0947 
0948 static int sur40_vidioc_enum_input(struct file *file, void *priv,
0949                    struct v4l2_input *i)
0950 {
0951     if (i->index != 0)
0952         return -EINVAL;
0953     i->type = V4L2_INPUT_TYPE_TOUCH;
0954     i->std = V4L2_STD_UNKNOWN;
0955     strlcpy(i->name, "In-Cell Sensor", sizeof(i->name));
0956     i->capabilities = 0;
0957     return 0;
0958 }
0959 
0960 static int sur40_vidioc_s_input(struct file *file, void *priv, unsigned int i)
0961 {
0962     return (i == 0) ? 0 : -EINVAL;
0963 }
0964 
0965 static int sur40_vidioc_g_input(struct file *file, void *priv, unsigned int *i)
0966 {
0967     *i = 0;
0968     return 0;
0969 }
0970 
0971 static int sur40_vidioc_try_fmt(struct file *file, void *priv,
0972                 struct v4l2_format *f)
0973 {
0974     switch (f->fmt.pix.pixelformat) {
0975     case V4L2_PIX_FMT_GREY:
0976         f->fmt.pix = sur40_pix_format[1];
0977         break;
0978 
0979     default:
0980         f->fmt.pix = sur40_pix_format[0];
0981         break;
0982     }
0983 
0984     return 0;
0985 }
0986 
0987 static int sur40_vidioc_s_fmt(struct file *file, void *priv,
0988                 struct v4l2_format *f)
0989 {
0990     struct sur40_state *sur40 = video_drvdata(file);
0991 
0992     switch (f->fmt.pix.pixelformat) {
0993     case V4L2_PIX_FMT_GREY:
0994         sur40->pix_fmt = sur40_pix_format[1];
0995         break;
0996 
0997     default:
0998         sur40->pix_fmt = sur40_pix_format[0];
0999         break;
1000     }
1001 
1002     f->fmt.pix = sur40->pix_fmt;
1003     return 0;
1004 }
1005 
1006 static int sur40_vidioc_g_fmt(struct file *file, void *priv,
1007                 struct v4l2_format *f)
1008 {
1009     struct sur40_state *sur40 = video_drvdata(file);
1010 
1011     f->fmt.pix = sur40->pix_fmt;
1012     return 0;
1013 }
1014 
1015 static int sur40_s_ctrl(struct v4l2_ctrl *ctrl)
1016 {
1017     struct sur40_state *sur40  = container_of(ctrl->handler,
1018       struct sur40_state, hdl);
1019     u8 value = sur40->vsvideo;
1020 
1021     switch (ctrl->id) {
1022     case V4L2_CID_BRIGHTNESS:
1023         sur40_set_irlevel(sur40, ctrl->val);
1024         break;
1025     case V4L2_CID_CONTRAST:
1026         value = (value & 0x0f) | (ctrl->val << 4);
1027         sur40_set_vsvideo(sur40, value);
1028         break;
1029     case V4L2_CID_GAIN:
1030         value = (value & 0xf0) | (ctrl->val);
1031         sur40_set_vsvideo(sur40, value);
1032         break;
1033     case V4L2_CID_BACKLIGHT_COMPENSATION:
1034         sur40_set_preprocessor(sur40, ctrl->val);
1035         break;
1036     }
1037     return 0;
1038 }
1039 
1040 static int sur40_ioctl_parm(struct file *file, void *priv,
1041                 struct v4l2_streamparm *p)
1042 {
1043     if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1044         return -EINVAL;
1045 
1046     p->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
1047     p->parm.capture.timeperframe.numerator = 1;
1048     p->parm.capture.timeperframe.denominator = 60;
1049     p->parm.capture.readbuffers = 3;
1050     return 0;
1051 }
1052 
1053 static int sur40_vidioc_enum_fmt(struct file *file, void *priv,
1054                  struct v4l2_fmtdesc *f)
1055 {
1056     if (f->index >= ARRAY_SIZE(sur40_pix_format))
1057         return -EINVAL;
1058 
1059     f->pixelformat = sur40_pix_format[f->index].pixelformat;
1060     f->flags = 0;
1061     return 0;
1062 }
1063 
1064 static int sur40_vidioc_enum_framesizes(struct file *file, void *priv,
1065                     struct v4l2_frmsizeenum *f)
1066 {
1067     struct sur40_state *sur40 = video_drvdata(file);
1068 
1069     if ((f->index != 0) || ((f->pixel_format != V4L2_TCH_FMT_TU08)
1070         && (f->pixel_format != V4L2_PIX_FMT_GREY)))
1071         return -EINVAL;
1072 
1073     f->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1074     f->discrete.width  = sur40->pix_fmt.width;
1075     f->discrete.height = sur40->pix_fmt.height;
1076     return 0;
1077 }
1078 
1079 static int sur40_vidioc_enum_frameintervals(struct file *file, void *priv,
1080                         struct v4l2_frmivalenum *f)
1081 {
1082     struct sur40_state *sur40 = video_drvdata(file);
1083 
1084     if ((f->index > 0) || ((f->pixel_format != V4L2_TCH_FMT_TU08)
1085         && (f->pixel_format != V4L2_PIX_FMT_GREY))
1086         || (f->width  != sur40->pix_fmt.width)
1087         || (f->height != sur40->pix_fmt.height))
1088         return -EINVAL;
1089 
1090     f->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1091     f->discrete.denominator  = 60;
1092     f->discrete.numerator = 1;
1093     return 0;
1094 }
1095 
1096 
1097 static const struct usb_device_id sur40_table[] = {
1098     { USB_DEVICE(ID_MICROSOFT, ID_SUR40) },  /* Samsung SUR40 */
1099     { }                                      /* terminating null entry */
1100 };
1101 MODULE_DEVICE_TABLE(usb, sur40_table);
1102 
1103 /* V4L2 structures */
1104 static const struct vb2_ops sur40_queue_ops = {
1105     .queue_setup        = sur40_queue_setup,
1106     .buf_prepare        = sur40_buffer_prepare,
1107     .buf_queue      = sur40_buffer_queue,
1108     .start_streaming    = sur40_start_streaming,
1109     .stop_streaming     = sur40_stop_streaming,
1110     .wait_prepare       = vb2_ops_wait_prepare,
1111     .wait_finish        = vb2_ops_wait_finish,
1112 };
1113 
1114 static const struct vb2_queue sur40_queue = {
1115     .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1116     /*
1117      * VB2_USERPTR in currently not enabled: passing a user pointer to
1118      * dma-sg will result in segment sizes that are not a multiple of
1119      * 512 bytes, which is required by the host controller.
1120     */
1121     .io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF,
1122     .buf_struct_size = sizeof(struct sur40_buffer),
1123     .ops = &sur40_queue_ops,
1124     .mem_ops = &vb2_dma_sg_memops,
1125     .timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC,
1126     .min_buffers_needed = 3,
1127 };
1128 
1129 static const struct v4l2_file_operations sur40_video_fops = {
1130     .owner = THIS_MODULE,
1131     .open = v4l2_fh_open,
1132     .release = vb2_fop_release,
1133     .unlocked_ioctl = video_ioctl2,
1134     .read = vb2_fop_read,
1135     .mmap = vb2_fop_mmap,
1136     .poll = vb2_fop_poll,
1137 };
1138 
1139 static const struct v4l2_ioctl_ops sur40_video_ioctl_ops = {
1140 
1141     .vidioc_querycap    = sur40_vidioc_querycap,
1142 
1143     .vidioc_enum_fmt_vid_cap = sur40_vidioc_enum_fmt,
1144     .vidioc_try_fmt_vid_cap = sur40_vidioc_try_fmt,
1145     .vidioc_s_fmt_vid_cap   = sur40_vidioc_s_fmt,
1146     .vidioc_g_fmt_vid_cap   = sur40_vidioc_g_fmt,
1147 
1148     .vidioc_enum_framesizes = sur40_vidioc_enum_framesizes,
1149     .vidioc_enum_frameintervals = sur40_vidioc_enum_frameintervals,
1150 
1151     .vidioc_g_parm = sur40_ioctl_parm,
1152     .vidioc_s_parm = sur40_ioctl_parm,
1153 
1154     .vidioc_enum_input  = sur40_vidioc_enum_input,
1155     .vidioc_g_input     = sur40_vidioc_g_input,
1156     .vidioc_s_input     = sur40_vidioc_s_input,
1157 
1158     .vidioc_reqbufs     = vb2_ioctl_reqbufs,
1159     .vidioc_create_bufs = vb2_ioctl_create_bufs,
1160     .vidioc_querybuf    = vb2_ioctl_querybuf,
1161     .vidioc_qbuf        = vb2_ioctl_qbuf,
1162     .vidioc_dqbuf       = vb2_ioctl_dqbuf,
1163     .vidioc_expbuf      = vb2_ioctl_expbuf,
1164 
1165     .vidioc_streamon    = vb2_ioctl_streamon,
1166     .vidioc_streamoff   = vb2_ioctl_streamoff,
1167 };
1168 
1169 static const struct video_device sur40_video_device = {
1170     .name = DRIVER_LONG,
1171     .fops = &sur40_video_fops,
1172     .ioctl_ops = &sur40_video_ioctl_ops,
1173     .release = video_device_release_empty,
1174     .device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TOUCH |
1175                V4L2_CAP_READWRITE | V4L2_CAP_STREAMING,
1176 };
1177 
1178 /* USB-specific object needed to register this driver with the USB subsystem. */
1179 static struct usb_driver sur40_driver = {
1180     .name = DRIVER_SHORT,
1181     .probe = sur40_probe,
1182     .disconnect = sur40_disconnect,
1183     .id_table = sur40_table,
1184 };
1185 
1186 module_usb_driver(sur40_driver);
1187 
1188 MODULE_AUTHOR(DRIVER_AUTHOR);
1189 MODULE_DESCRIPTION(DRIVER_DESC);
1190 MODULE_LICENSE("GPL");
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