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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Surface2.0/SUR40/PixelSense input driver
4 *
5 * Copyright (c) 2014 by Florian 'floe' Echtler <[email protected]>
6 *
7 * Derived from the USB Skeleton driver 1.1,
8 * Copyright (c) 2003 Greg Kroah-Hartman ([email protected])
9 *
10 * and from the Apple USB BCM5974 multitouch driver,
11 * Copyright (c) 2008 Henrik Rydberg ([email protected])
12 *
13 * and from the generic hid-multitouch driver,
14 * Copyright (c) 2010-2012 Stephane Chatty <[email protected]>
15 *
16 * and from the v4l2-pci-skeleton driver,
17 * Copyright (c) Copyright 2014 Cisco Systems, Inc.
18 */
19
20#include <linux/kernel.h>
21#include <linux/errno.h>
22#include <linux/delay.h>
23#include <linux/init.h>
24#include <linux/slab.h>
25#include <linux/module.h>
26#include <linux/completion.h>
27#include <linux/uaccess.h>
28#include <linux/usb.h>
29#include <linux/printk.h>
30#include <linux/input.h>
31#include <linux/input/mt.h>
32#include <linux/usb/input.h>
33#include <linux/videodev2.h>
34#include <media/v4l2-device.h>
35#include <media/v4l2-dev.h>
36#include <media/v4l2-ioctl.h>
37#include <media/v4l2-ctrls.h>
38#include <media/videobuf2-v4l2.h>
39#include <media/videobuf2-dma-sg.h>
40
41/* read 512 bytes from endpoint 0x86 -> get header + blobs */
42struct sur40_header {
43
44 __le16 type; /* always 0x0001 */
45 __le16 count; /* count of blobs (if 0: continue prev. packet) */
46
47 __le32 packet_id; /* unique ID for all packets in one frame */
48
49 __le32 timestamp; /* milliseconds (inc. by 16 or 17 each frame) */
50 __le32 unknown; /* "epoch?" always 02/03 00 00 00 */
51
52} __packed;
53
54struct sur40_blob {
55
56 __le16 blob_id;
57
58 u8 action; /* 0x02 = enter/exit, 0x03 = update (?) */
59 u8 type; /* bitmask (0x01 blob, 0x02 touch, 0x04 tag) */
60
61 __le16 bb_pos_x; /* upper left corner of bounding box */
62 __le16 bb_pos_y;
63
64 __le16 bb_size_x; /* size of bounding box */
65 __le16 bb_size_y;
66
67 __le16 pos_x; /* finger tip position */
68 __le16 pos_y;
69
70 __le16 ctr_x; /* centroid position */
71 __le16 ctr_y;
72
73 __le16 axis_x; /* somehow related to major/minor axis, mostly: */
74 __le16 axis_y; /* axis_x == bb_size_y && axis_y == bb_size_x */
75
76 __le32 angle; /* orientation in radians relative to x axis -
77 actually an IEEE754 float, don't use in kernel */
78
79 __le32 area; /* size in pixels/pressure (?) */
80
81 u8 padding[24];
82
83 __le32 tag_id; /* valid when type == 0x04 (SUR40_TAG) */
84 __le32 unknown;
85
86} __packed;
87
88/* combined header/blob data */
89struct sur40_data {
90 struct sur40_header header;
91 struct sur40_blob blobs[];
92} __packed;
93
94/* read 512 bytes from endpoint 0x82 -> get header below
95 * continue reading 16k blocks until header.size bytes read */
96struct sur40_image_header {
97 __le32 magic; /* "SUBF" */
98 __le32 packet_id;
99 __le32 size; /* always 0x0007e900 = 960x540 */
100 __le32 timestamp; /* milliseconds (increases by 16 or 17 each frame) */
101 __le32 unknown; /* "epoch?" always 02/03 00 00 00 */
102} __packed;
103
104/* version information */
105#define DRIVER_SHORT "sur40"
106#define DRIVER_LONG "Samsung SUR40"
107#define DRIVER_AUTHOR "Florian 'floe' Echtler <[email protected]>"
108#define DRIVER_DESC "Surface2.0/SUR40/PixelSense input driver"
109
110/* vendor and device IDs */
111#define ID_MICROSOFT 0x045e
112#define ID_SUR40 0x0775
113
114/* sensor resolution */
115#define SENSOR_RES_X 1920
116#define SENSOR_RES_Y 1080
117
118/* touch data endpoint */
119#define TOUCH_ENDPOINT 0x86
120
121/* video data endpoint */
122#define VIDEO_ENDPOINT 0x82
123
124/* video header fields */
125#define VIDEO_HEADER_MAGIC 0x46425553
126#define VIDEO_PACKET_SIZE 16384
127
128/* polling interval (ms) */
129#define POLL_INTERVAL 1
130
131/* maximum number of contacts */
132#define MAX_CONTACTS 52
133
134/* control commands */
135#define SUR40_GET_VERSION 0xb0 /* 12 bytes string */
136#define SUR40_ACCEL_CAPS 0xb3 /* 5 bytes */
137#define SUR40_SENSOR_CAPS 0xc1 /* 24 bytes */
138
139#define SUR40_POKE 0xc5 /* poke register byte */
140#define SUR40_PEEK 0xc4 /* 48 bytes registers */
141
142#define SUR40_GET_STATE 0xc5 /* 4 bytes state (?) */
143#define SUR40_GET_SENSORS 0xb1 /* 8 bytes sensors */
144
145#define SUR40_BLOB 0x01
146#define SUR40_TOUCH 0x02
147#define SUR40_TAG 0x04
148
149/* video controls */
150#define SUR40_BRIGHTNESS_MAX 0xff
151#define SUR40_BRIGHTNESS_MIN 0x00
152#define SUR40_BRIGHTNESS_DEF 0xff
153
154#define SUR40_CONTRAST_MAX 0x0f
155#define SUR40_CONTRAST_MIN 0x00
156#define SUR40_CONTRAST_DEF 0x0a
157
158#define SUR40_GAIN_MAX 0x09
159#define SUR40_GAIN_MIN 0x00
160#define SUR40_GAIN_DEF 0x08
161
162#define SUR40_BACKLIGHT_MAX 0x01
163#define SUR40_BACKLIGHT_MIN 0x00
164#define SUR40_BACKLIGHT_DEF 0x01
165
166#define sur40_str(s) #s
167#define SUR40_PARAM_RANGE(lo, hi) " (range " sur40_str(lo) "-" sur40_str(hi) ")"
168
169/* module parameters */
170static uint brightness = SUR40_BRIGHTNESS_DEF;
171module_param(brightness, uint, 0644);
172MODULE_PARM_DESC(brightness, "set initial brightness"
173 SUR40_PARAM_RANGE(SUR40_BRIGHTNESS_MIN, SUR40_BRIGHTNESS_MAX));
174static uint contrast = SUR40_CONTRAST_DEF;
175module_param(contrast, uint, 0644);
176MODULE_PARM_DESC(contrast, "set initial contrast"
177 SUR40_PARAM_RANGE(SUR40_CONTRAST_MIN, SUR40_CONTRAST_MAX));
178static uint gain = SUR40_GAIN_DEF;
179module_param(gain, uint, 0644);
180MODULE_PARM_DESC(gain, "set initial gain"
181 SUR40_PARAM_RANGE(SUR40_GAIN_MIN, SUR40_GAIN_MAX));
182
183static const struct v4l2_pix_format sur40_pix_format[] = {
184 {
185 .pixelformat = V4L2_TCH_FMT_TU08,
186 .width = SENSOR_RES_X / 2,
187 .height = SENSOR_RES_Y / 2,
188 .field = V4L2_FIELD_NONE,
189 .colorspace = V4L2_COLORSPACE_RAW,
190 .bytesperline = SENSOR_RES_X / 2,
191 .sizeimage = (SENSOR_RES_X/2) * (SENSOR_RES_Y/2),
192 },
193 {
194 .pixelformat = V4L2_PIX_FMT_GREY,
195 .width = SENSOR_RES_X / 2,
196 .height = SENSOR_RES_Y / 2,
197 .field = V4L2_FIELD_NONE,
198 .colorspace = V4L2_COLORSPACE_RAW,
199 .bytesperline = SENSOR_RES_X / 2,
200 .sizeimage = (SENSOR_RES_X/2) * (SENSOR_RES_Y/2),
201 }
202};
203
204/* master device state */
205struct sur40_state {
206
207 struct usb_device *usbdev;
208 struct device *dev;
209 struct input_dev *input;
210
211 struct v4l2_device v4l2;
212 struct video_device vdev;
213 struct mutex lock;
214 struct v4l2_pix_format pix_fmt;
215 struct v4l2_ctrl_handler hdl;
216
217 struct vb2_queue queue;
218 struct list_head buf_list;
219 spinlock_t qlock;
220 int sequence;
221
222 struct sur40_data *bulk_in_buffer;
223 size_t bulk_in_size;
224 u8 bulk_in_epaddr;
225 u8 vsvideo;
226
227 char phys[64];
228};
229
230struct sur40_buffer {
231 struct vb2_v4l2_buffer vb;
232 struct list_head list;
233};
234
235/* forward declarations */
236static const struct video_device sur40_video_device;
237static const struct vb2_queue sur40_queue;
238static void sur40_process_video(struct sur40_state *sur40);
239static int sur40_s_ctrl(struct v4l2_ctrl *ctrl);
240
241static const struct v4l2_ctrl_ops sur40_ctrl_ops = {
242 .s_ctrl = sur40_s_ctrl,
243};
244
245/*
246 * Note: an earlier, non-public version of this driver used USB_RECIP_ENDPOINT
247 * here by mistake which is very likely to have corrupted the firmware EEPROM
248 * on two separate SUR40 devices. Thanks to Alan Stern who spotted this bug.
249 * Should you ever run into a similar problem, the background story to this
250 * incident and instructions on how to fix the corrupted EEPROM are available
251 * at https://floe.butterbrot.org/matrix/hacking/surface/brick.html
252*/
253
254/* command wrapper */
255static int sur40_command(struct sur40_state *dev,
256 u8 command, u16 index, void *buffer, u16 size)
257{
258 return usb_control_msg(dev->usbdev, usb_rcvctrlpipe(dev->usbdev, 0),
259 command,
260 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
261 0x00, index, buffer, size, 1000);
262}
263
264/* poke a byte in the panel register space */
265static int sur40_poke(struct sur40_state *dev, u8 offset, u8 value)
266{
267 int result;
268 u8 index = 0x96; // 0xae for permanent write
269
270 result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
271 SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
272 0x32, index, NULL, 0, 1000);
273 if (result < 0)
274 goto error;
275 msleep(5);
276
277 result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
278 SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
279 0x72, offset, NULL, 0, 1000);
280 if (result < 0)
281 goto error;
282 msleep(5);
283
284 result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
285 SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
286 0xb2, value, NULL, 0, 1000);
287 if (result < 0)
288 goto error;
289 msleep(5);
290
291error:
292 return result;
293}
294
295static int sur40_set_preprocessor(struct sur40_state *dev, u8 value)
296{
297 u8 setting_07[2] = { 0x01, 0x00 };
298 u8 setting_17[2] = { 0x85, 0x80 };
299 int result;
300
301 if (value > 1)
302 return -ERANGE;
303
304 result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
305 SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
306 0x07, setting_07[value], NULL, 0, 1000);
307 if (result < 0)
308 goto error;
309 msleep(5);
310
311 result = usb_control_msg(dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
312 SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
313 0x17, setting_17[value], NULL, 0, 1000);
314 if (result < 0)
315 goto error;
316 msleep(5);
317
318error:
319 return result;
320}
321
322static void sur40_set_vsvideo(struct sur40_state *handle, u8 value)
323{
324 int i;
325
326 for (i = 0; i < 4; i++)
327 sur40_poke(handle, 0x1c+i, value);
328 handle->vsvideo = value;
329}
330
331static void sur40_set_irlevel(struct sur40_state *handle, u8 value)
332{
333 int i;
334
335 for (i = 0; i < 8; i++)
336 sur40_poke(handle, 0x08+(2*i), value);
337}
338
339/* Initialization routine, called from sur40_open */
340static int sur40_init(struct sur40_state *dev)
341{
342 int result;
343 u8 *buffer;
344
345 buffer = kmalloc(24, GFP_KERNEL);
346 if (!buffer) {
347 result = -ENOMEM;
348 goto error;
349 }
350
351 /* stupidly replay the original MS driver init sequence */
352 result = sur40_command(dev, SUR40_GET_VERSION, 0x00, buffer, 12);
353 if (result < 0)
354 goto error;
355
356 result = sur40_command(dev, SUR40_GET_VERSION, 0x01, buffer, 12);
357 if (result < 0)
358 goto error;
359
360 result = sur40_command(dev, SUR40_GET_VERSION, 0x02, buffer, 12);
361 if (result < 0)
362 goto error;
363
364 result = sur40_command(dev, SUR40_SENSOR_CAPS, 0x00, buffer, 24);
365 if (result < 0)
366 goto error;
367
368 result = sur40_command(dev, SUR40_ACCEL_CAPS, 0x00, buffer, 5);
369 if (result < 0)
370 goto error;
371
372 result = sur40_command(dev, SUR40_GET_VERSION, 0x03, buffer, 12);
373 if (result < 0)
374 goto error;
375
376 result = 0;
377
378 /*
379 * Discard the result buffer - no known data inside except
380 * some version strings, maybe extract these sometime...
381 */
382error:
383 kfree(buffer);
384 return result;
385}
386
387/*
388 * Callback routines from input_dev
389 */
390
391/* Enable the device, polling will now start. */
392static int sur40_open(struct input_dev *input)
393{
394 struct sur40_state *sur40 = input_get_drvdata(input);
395
396 dev_dbg(sur40->dev, "open\n");
397 return sur40_init(sur40);
398}
399
400/* Disable device, polling has stopped. */
401static void sur40_close(struct input_dev *input)
402{
403 struct sur40_state *sur40 = input_get_drvdata(input);
404
405 dev_dbg(sur40->dev, "close\n");
406 /*
407 * There is no known way to stop the device, so we simply
408 * stop polling.
409 */
410}
411
412/*
413 * This function is called when a whole contact has been processed,
414 * so that it can assign it to a slot and store the data there.
415 */
416static void sur40_report_blob(struct sur40_blob *blob, struct input_dev *input)
417{
418 int wide, major, minor;
419 int bb_size_x, bb_size_y, pos_x, pos_y, ctr_x, ctr_y, slotnum;
420
421 if (blob->type != SUR40_TOUCH)
422 return;
423
424 slotnum = input_mt_get_slot_by_key(input, le16_to_cpu(blob->blob_id));
425 if (slotnum < 0 || slotnum >= MAX_CONTACTS)
426 return;
427
428 bb_size_x = le16_to_cpu(blob->bb_size_x);
429 bb_size_y = le16_to_cpu(blob->bb_size_y);
430
431 pos_x = le16_to_cpu(blob->pos_x);
432 pos_y = le16_to_cpu(blob->pos_y);
433
434 ctr_x = le16_to_cpu(blob->ctr_x);
435 ctr_y = le16_to_cpu(blob->ctr_y);
436
437 input_mt_slot(input, slotnum);
438 input_mt_report_slot_state(input, MT_TOOL_FINGER, 1);
439 wide = (bb_size_x > bb_size_y);
440 major = max(bb_size_x, bb_size_y);
441 minor = min(bb_size_x, bb_size_y);
442
443 input_report_abs(input, ABS_MT_POSITION_X, pos_x);
444 input_report_abs(input, ABS_MT_POSITION_Y, pos_y);
445 input_report_abs(input, ABS_MT_TOOL_X, ctr_x);
446 input_report_abs(input, ABS_MT_TOOL_Y, ctr_y);
447
448 /* TODO: use a better orientation measure */
449 input_report_abs(input, ABS_MT_ORIENTATION, wide);
450 input_report_abs(input, ABS_MT_TOUCH_MAJOR, major);
451 input_report_abs(input, ABS_MT_TOUCH_MINOR, minor);
452}
453
454/* core function: poll for new input data */
455static void sur40_poll(struct input_dev *input)
456{
457 struct sur40_state *sur40 = input_get_drvdata(input);
458 int result, bulk_read, need_blobs, packet_blobs, i;
459 struct sur40_header *header = &sur40->bulk_in_buffer->header;
460 struct sur40_blob *inblob = &sur40->bulk_in_buffer->blobs[0];
461
462 dev_dbg(sur40->dev, "poll\n");
463
464 need_blobs = -1;
465
466 do {
467
468 /* perform a blocking bulk read to get data from the device */
469 result = usb_bulk_msg(sur40->usbdev,
470 usb_rcvbulkpipe(sur40->usbdev, sur40->bulk_in_epaddr),
471 sur40->bulk_in_buffer, sur40->bulk_in_size,
472 &bulk_read, 1000);
473
474 dev_dbg(sur40->dev, "received %d bytes\n", bulk_read);
475
476 if (result < 0) {
477 dev_err(sur40->dev, "error in usb_bulk_read\n");
478 return;
479 }
480
481 result = bulk_read - sizeof(struct sur40_header);
482
483 if (result % sizeof(struct sur40_blob) != 0) {
484 dev_err(sur40->dev, "transfer size mismatch\n");
485 return;
486 }
487
488 /* first packet? */
489 if (need_blobs == -1) {
490 need_blobs = le16_to_cpu(header->count);
491 dev_dbg(sur40->dev, "need %d blobs\n", need_blobs);
492 /* packet_id = le32_to_cpu(header->packet_id); */
493 }
494
495 /*
496 * Sanity check. when video data is also being retrieved, the
497 * packet ID will usually increase in the middle of a series
498 * instead of at the end. However, the data is still consistent,
499 * so the packet ID is probably just valid for the first packet
500 * in a series.
501
502 if (packet_id != le32_to_cpu(header->packet_id))
503 dev_dbg(sur40->dev, "packet ID mismatch\n");
504 */
505
506 packet_blobs = result / sizeof(struct sur40_blob);
507 dev_dbg(sur40->dev, "received %d blobs\n", packet_blobs);
508
509 /* packets always contain at least 4 blobs, even if empty */
510 if (packet_blobs > need_blobs)
511 packet_blobs = need_blobs;
512
513 for (i = 0; i < packet_blobs; i++) {
514 need_blobs--;
515 dev_dbg(sur40->dev, "processing blob\n");
516 sur40_report_blob(&(inblob[i]), input);
517 }
518
519 } while (need_blobs > 0);
520
521 input_mt_sync_frame(input);
522 input_sync(input);
523
524 sur40_process_video(sur40);
525}
526
527/* deal with video data */
528static void sur40_process_video(struct sur40_state *sur40)
529{
530
531 struct sur40_image_header *img = (void *)(sur40->bulk_in_buffer);
532 struct sur40_buffer *new_buf;
533 struct usb_sg_request sgr;
534 struct sg_table *sgt;
535 int result, bulk_read;
536
537 if (!vb2_start_streaming_called(&sur40->queue))
538 return;
539
540 /* get a new buffer from the list */
541 scoped_guard(spinlock, &sur40->qlock) {
542 if (list_empty(&sur40->buf_list)) {
543 dev_dbg(sur40->dev, "buffer queue empty\n");
544 return;
545 }
546 new_buf = list_first_entry(&sur40->buf_list,
547 struct sur40_buffer, list);
548 list_del(&new_buf->list);
549 }
550
551 dev_dbg(sur40->dev, "buffer acquired\n");
552
553 /* retrieve data via bulk read */
554 result = usb_bulk_msg(sur40->usbdev,
555 usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT),
556 sur40->bulk_in_buffer, sur40->bulk_in_size,
557 &bulk_read, 1000);
558
559 if (result < 0) {
560 dev_err(sur40->dev, "error in usb_bulk_read\n");
561 goto err_poll;
562 }
563
564 if (bulk_read != sizeof(struct sur40_image_header)) {
565 dev_err(sur40->dev, "received %d bytes (%zd expected)\n",
566 bulk_read, sizeof(struct sur40_image_header));
567 goto err_poll;
568 }
569
570 if (le32_to_cpu(img->magic) != VIDEO_HEADER_MAGIC) {
571 dev_err(sur40->dev, "image magic mismatch\n");
572 goto err_poll;
573 }
574
575 if (le32_to_cpu(img->size) != sur40->pix_fmt.sizeimage) {
576 dev_err(sur40->dev, "image size mismatch\n");
577 goto err_poll;
578 }
579
580 dev_dbg(sur40->dev, "header acquired\n");
581
582 sgt = vb2_dma_sg_plane_desc(&new_buf->vb.vb2_buf, 0);
583
584 result = usb_sg_init(&sgr, sur40->usbdev,
585 usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT), 0,
586 sgt->sgl, sgt->nents, sur40->pix_fmt.sizeimage, 0);
587 if (result < 0) {
588 dev_err(sur40->dev, "error %d in usb_sg_init\n", result);
589 goto err_poll;
590 }
591
592 usb_sg_wait(&sgr);
593 if (sgr.status < 0) {
594 dev_err(sur40->dev, "error %d in usb_sg_wait\n", sgr.status);
595 goto err_poll;
596 }
597
598 dev_dbg(sur40->dev, "image acquired\n");
599
600 /* return error if streaming was stopped in the meantime */
601 if (sur40->sequence == -1)
602 return;
603
604 /* mark as finished */
605 new_buf->vb.vb2_buf.timestamp = ktime_get_ns();
606 new_buf->vb.sequence = sur40->sequence++;
607 new_buf->vb.field = V4L2_FIELD_NONE;
608 vb2_buffer_done(&new_buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
609 dev_dbg(sur40->dev, "buffer marked done\n");
610 return;
611
612err_poll:
613 vb2_buffer_done(&new_buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
614}
615
616/* Initialize input device parameters. */
617static int sur40_input_setup_events(struct input_dev *input_dev)
618{
619 int error;
620
621 input_set_abs_params(input_dev, ABS_MT_POSITION_X,
622 0, SENSOR_RES_X, 0, 0);
623 input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
624 0, SENSOR_RES_Y, 0, 0);
625
626 input_set_abs_params(input_dev, ABS_MT_TOOL_X,
627 0, SENSOR_RES_X, 0, 0);
628 input_set_abs_params(input_dev, ABS_MT_TOOL_Y,
629 0, SENSOR_RES_Y, 0, 0);
630
631 /* max value unknown, but major/minor axis
632 * can never be larger than screen */
633 input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
634 0, SENSOR_RES_X, 0, 0);
635 input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR,
636 0, SENSOR_RES_Y, 0, 0);
637
638 input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0);
639
640 error = input_mt_init_slots(input_dev, MAX_CONTACTS,
641 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
642 if (error) {
643 dev_err(input_dev->dev.parent, "failed to set up slots\n");
644 return error;
645 }
646
647 return 0;
648}
649
650/* Check candidate USB interface. */
651static int sur40_probe(struct usb_interface *interface,
652 const struct usb_device_id *id)
653{
654 struct usb_device *usbdev = interface_to_usbdev(interface);
655 struct sur40_state *sur40;
656 struct usb_host_interface *iface_desc;
657 struct usb_endpoint_descriptor *endpoint;
658 struct input_dev *input;
659 int error;
660
661 /* Check if we really have the right interface. */
662 iface_desc = interface->cur_altsetting;
663 if (iface_desc->desc.bInterfaceClass != 0xFF)
664 return -ENODEV;
665
666 if (iface_desc->desc.bNumEndpoints < 5)
667 return -ENODEV;
668
669 /* Use endpoint #4 (0x86). */
670 endpoint = &iface_desc->endpoint[4].desc;
671 if (endpoint->bEndpointAddress != TOUCH_ENDPOINT)
672 return -ENODEV;
673
674 /* Allocate memory for our device state and initialize it. */
675 sur40 = kzalloc_obj(*sur40);
676 if (!sur40)
677 return -ENOMEM;
678
679 input = input_allocate_device();
680 if (!input) {
681 error = -ENOMEM;
682 goto err_free_dev;
683 }
684
685 /* initialize locks/lists */
686 INIT_LIST_HEAD(&sur40->buf_list);
687 spin_lock_init(&sur40->qlock);
688 mutex_init(&sur40->lock);
689
690 /* Set up regular input device structure */
691 input->name = DRIVER_LONG;
692 usb_to_input_id(usbdev, &input->id);
693 usb_make_path(usbdev, sur40->phys, sizeof(sur40->phys));
694 strlcat(sur40->phys, "/input0", sizeof(sur40->phys));
695 input->phys = sur40->phys;
696 input->dev.parent = &interface->dev;
697
698 input->open = sur40_open;
699 input->close = sur40_close;
700
701 error = sur40_input_setup_events(input);
702 if (error)
703 goto err_free_input;
704
705 input_set_drvdata(input, sur40);
706 error = input_setup_polling(input, sur40_poll);
707 if (error) {
708 dev_err(&interface->dev, "failed to set up polling");
709 goto err_free_input;
710 }
711
712 input_set_poll_interval(input, POLL_INTERVAL);
713
714 sur40->usbdev = usbdev;
715 sur40->dev = &interface->dev;
716 sur40->input = input;
717
718 /* use the bulk-in endpoint tested above */
719 sur40->bulk_in_size = usb_endpoint_maxp(endpoint);
720 sur40->bulk_in_epaddr = endpoint->bEndpointAddress;
721 sur40->bulk_in_buffer = kmalloc(sur40->bulk_in_size, GFP_KERNEL);
722 if (!sur40->bulk_in_buffer) {
723 dev_err(&interface->dev, "Unable to allocate input buffer.");
724 error = -ENOMEM;
725 goto err_free_input;
726 }
727
728 /* register the video master device */
729 snprintf(sur40->v4l2.name, sizeof(sur40->v4l2.name), "%s", DRIVER_LONG);
730 error = v4l2_device_register(sur40->dev, &sur40->v4l2);
731 if (error) {
732 dev_err(&interface->dev,
733 "Unable to register video master device.");
734 goto err_free_buffer;
735 }
736
737 /* initialize the lock and subdevice */
738 sur40->queue = sur40_queue;
739 sur40->queue.drv_priv = sur40;
740 sur40->queue.lock = &sur40->lock;
741 sur40->queue.dev = sur40->dev;
742
743 /* initialize the queue */
744 error = vb2_queue_init(&sur40->queue);
745 if (error)
746 goto err_unreg_v4l2;
747
748 sur40->pix_fmt = sur40_pix_format[0];
749 sur40->vdev = sur40_video_device;
750 sur40->vdev.v4l2_dev = &sur40->v4l2;
751 sur40->vdev.lock = &sur40->lock;
752 sur40->vdev.queue = &sur40->queue;
753 video_set_drvdata(&sur40->vdev, sur40);
754
755 /* initialize the control handler for 4 controls */
756 v4l2_ctrl_handler_init(&sur40->hdl, 4);
757 sur40->v4l2.ctrl_handler = &sur40->hdl;
758 sur40->vsvideo = (SUR40_CONTRAST_DEF << 4) | SUR40_GAIN_DEF;
759
760 v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops, V4L2_CID_BRIGHTNESS,
761 SUR40_BRIGHTNESS_MIN, SUR40_BRIGHTNESS_MAX, 1, clamp(brightness,
762 (uint)SUR40_BRIGHTNESS_MIN, (uint)SUR40_BRIGHTNESS_MAX));
763
764 v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops, V4L2_CID_CONTRAST,
765 SUR40_CONTRAST_MIN, SUR40_CONTRAST_MAX, 1, clamp(contrast,
766 (uint)SUR40_CONTRAST_MIN, (uint)SUR40_CONTRAST_MAX));
767
768 v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops, V4L2_CID_GAIN,
769 SUR40_GAIN_MIN, SUR40_GAIN_MAX, 1, clamp(gain,
770 (uint)SUR40_GAIN_MIN, (uint)SUR40_GAIN_MAX));
771
772 v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops,
773 V4L2_CID_BACKLIGHT_COMPENSATION, SUR40_BACKLIGHT_MIN,
774 SUR40_BACKLIGHT_MAX, 1, SUR40_BACKLIGHT_DEF);
775
776 v4l2_ctrl_handler_setup(&sur40->hdl);
777
778 if (sur40->hdl.error) {
779 dev_err(&interface->dev,
780 "Unable to register video controls.");
781 v4l2_ctrl_handler_free(&sur40->hdl);
782 error = sur40->hdl.error;
783 goto err_unreg_v4l2;
784 }
785
786 error = video_register_device(&sur40->vdev, VFL_TYPE_TOUCH, -1);
787 if (error) {
788 dev_err(&interface->dev,
789 "Unable to register video subdevice.");
790 goto err_free_ctrl;
791 }
792
793 /* register the polled input device */
794 error = input_register_device(input);
795 if (error) {
796 dev_err(&interface->dev,
797 "Unable to register polled input device.");
798 goto err_unreg_video;
799 }
800
801 /* we can register the device now, as it is ready */
802 usb_set_intfdata(interface, sur40);
803 dev_dbg(&interface->dev, "%s is now attached\n", DRIVER_DESC);
804
805 return 0;
806
807err_unreg_video:
808 video_unregister_device(&sur40->vdev);
809err_free_ctrl:
810 v4l2_ctrl_handler_free(&sur40->hdl);
811err_unreg_v4l2:
812 v4l2_device_unregister(&sur40->v4l2);
813err_free_buffer:
814 kfree(sur40->bulk_in_buffer);
815err_free_input:
816 input_free_device(input);
817err_free_dev:
818 kfree(sur40);
819
820 return error;
821}
822
823/* Unregister device & clean up. */
824static void sur40_disconnect(struct usb_interface *interface)
825{
826 struct sur40_state *sur40 = usb_get_intfdata(interface);
827
828 input_unregister_device(sur40->input);
829
830 v4l2_ctrl_handler_free(&sur40->hdl);
831 video_unregister_device(&sur40->vdev);
832 v4l2_device_unregister(&sur40->v4l2);
833
834 kfree(sur40->bulk_in_buffer);
835 kfree(sur40);
836
837 usb_set_intfdata(interface, NULL);
838 dev_dbg(&interface->dev, "%s is now disconnected\n", DRIVER_DESC);
839}
840
841/*
842 * Setup the constraints of the queue: besides setting the number of planes
843 * per buffer and the size and allocation context of each plane, it also
844 * checks if sufficient buffers have been allocated. Usually 3 is a good
845 * minimum number: many DMA engines need a minimum of 2 buffers in the
846 * queue and you need to have another available for userspace processing.
847 */
848static int sur40_queue_setup(struct vb2_queue *q,
849 unsigned int *nbuffers, unsigned int *nplanes,
850 unsigned int sizes[], struct device *alloc_devs[])
851{
852 struct sur40_state *sur40 = vb2_get_drv_priv(q);
853 unsigned int q_num_bufs = vb2_get_num_buffers(q);
854
855 if (q_num_bufs + *nbuffers < 3)
856 *nbuffers = 3 - q_num_bufs;
857
858 if (*nplanes)
859 return sizes[0] < sur40->pix_fmt.sizeimage ? -EINVAL : 0;
860
861 *nplanes = 1;
862 sizes[0] = sur40->pix_fmt.sizeimage;
863
864 return 0;
865}
866
867/*
868 * Prepare the buffer for queueing to the DMA engine: check and set the
869 * payload size.
870 */
871static int sur40_buffer_prepare(struct vb2_buffer *vb)
872{
873 struct sur40_state *sur40 = vb2_get_drv_priv(vb->vb2_queue);
874 unsigned long size = sur40->pix_fmt.sizeimage;
875
876 if (vb2_plane_size(vb, 0) < size) {
877 dev_err(&sur40->usbdev->dev, "buffer too small (%lu < %lu)\n",
878 vb2_plane_size(vb, 0), size);
879 return -EINVAL;
880 }
881
882 vb2_set_plane_payload(vb, 0, size);
883 return 0;
884}
885
886/*
887 * Queue this buffer to the DMA engine.
888 */
889static void sur40_buffer_queue(struct vb2_buffer *vb)
890{
891 struct sur40_state *sur40 = vb2_get_drv_priv(vb->vb2_queue);
892 struct sur40_buffer *buf = (struct sur40_buffer *)vb;
893
894 guard(spinlock)(&sur40->qlock);
895 list_add_tail(&buf->list, &sur40->buf_list);
896}
897
898static void return_all_buffers(struct sur40_state *sur40,
899 enum vb2_buffer_state state)
900{
901 struct sur40_buffer *buf, *node;
902
903 guard(spinlock)(&sur40->qlock);
904
905 list_for_each_entry_safe(buf, node, &sur40->buf_list, list) {
906 vb2_buffer_done(&buf->vb.vb2_buf, state);
907 list_del(&buf->list);
908 }
909}
910
911/*
912 * Start streaming. First check if the minimum number of buffers have been
913 * queued. If not, then return -ENOBUFS and the vb2 framework will call
914 * this function again the next time a buffer has been queued until enough
915 * buffers are available to actually start the DMA engine.
916 */
917static int sur40_start_streaming(struct vb2_queue *vq, unsigned int count)
918{
919 struct sur40_state *sur40 = vb2_get_drv_priv(vq);
920
921 sur40->sequence = 0;
922 return 0;
923}
924
925/*
926 * Stop the DMA engine. Any remaining buffers in the DMA queue are dequeued
927 * and passed on to the vb2 framework marked as STATE_ERROR.
928 */
929static void sur40_stop_streaming(struct vb2_queue *vq)
930{
931 struct sur40_state *sur40 = vb2_get_drv_priv(vq);
932 vb2_wait_for_all_buffers(vq);
933 sur40->sequence = -1;
934
935 /* Release all active buffers */
936 return_all_buffers(sur40, VB2_BUF_STATE_ERROR);
937}
938
939/* V4L ioctl */
940static int sur40_vidioc_querycap(struct file *file, void *priv,
941 struct v4l2_capability *cap)
942{
943 struct sur40_state *sur40 = video_drvdata(file);
944
945 strscpy(cap->driver, DRIVER_SHORT, sizeof(cap->driver));
946 strscpy(cap->card, DRIVER_LONG, sizeof(cap->card));
947 usb_make_path(sur40->usbdev, cap->bus_info, sizeof(cap->bus_info));
948 return 0;
949}
950
951static int sur40_vidioc_enum_input(struct file *file, void *priv,
952 struct v4l2_input *i)
953{
954 if (i->index != 0)
955 return -EINVAL;
956 i->type = V4L2_INPUT_TYPE_TOUCH;
957 i->std = V4L2_STD_UNKNOWN;
958 strscpy(i->name, "In-Cell Sensor", sizeof(i->name));
959 i->capabilities = 0;
960 return 0;
961}
962
963static int sur40_vidioc_s_input(struct file *file, void *priv, unsigned int i)
964{
965 return (i == 0) ? 0 : -EINVAL;
966}
967
968static int sur40_vidioc_g_input(struct file *file, void *priv, unsigned int *i)
969{
970 *i = 0;
971 return 0;
972}
973
974static int sur40_vidioc_try_fmt(struct file *file, void *priv,
975 struct v4l2_format *f)
976{
977 switch (f->fmt.pix.pixelformat) {
978 case V4L2_PIX_FMT_GREY:
979 f->fmt.pix = sur40_pix_format[1];
980 break;
981
982 default:
983 f->fmt.pix = sur40_pix_format[0];
984 break;
985 }
986
987 return 0;
988}
989
990static int sur40_vidioc_s_fmt(struct file *file, void *priv,
991 struct v4l2_format *f)
992{
993 struct sur40_state *sur40 = video_drvdata(file);
994
995 switch (f->fmt.pix.pixelformat) {
996 case V4L2_PIX_FMT_GREY:
997 sur40->pix_fmt = sur40_pix_format[1];
998 break;
999
1000 default:
1001 sur40->pix_fmt = sur40_pix_format[0];
1002 break;
1003 }
1004
1005 f->fmt.pix = sur40->pix_fmt;
1006 return 0;
1007}
1008
1009static int sur40_vidioc_g_fmt(struct file *file, void *priv,
1010 struct v4l2_format *f)
1011{
1012 struct sur40_state *sur40 = video_drvdata(file);
1013
1014 f->fmt.pix = sur40->pix_fmt;
1015 return 0;
1016}
1017
1018static int sur40_s_ctrl(struct v4l2_ctrl *ctrl)
1019{
1020 struct sur40_state *sur40 = container_of(ctrl->handler,
1021 struct sur40_state, hdl);
1022 u8 value = sur40->vsvideo;
1023
1024 switch (ctrl->id) {
1025 case V4L2_CID_BRIGHTNESS:
1026 sur40_set_irlevel(sur40, ctrl->val);
1027 break;
1028 case V4L2_CID_CONTRAST:
1029 value = (value & 0x0f) | (ctrl->val << 4);
1030 sur40_set_vsvideo(sur40, value);
1031 break;
1032 case V4L2_CID_GAIN:
1033 value = (value & 0xf0) | (ctrl->val);
1034 sur40_set_vsvideo(sur40, value);
1035 break;
1036 case V4L2_CID_BACKLIGHT_COMPENSATION:
1037 sur40_set_preprocessor(sur40, ctrl->val);
1038 break;
1039 }
1040 return 0;
1041}
1042
1043static int sur40_ioctl_parm(struct file *file, void *priv,
1044 struct v4l2_streamparm *p)
1045{
1046 if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1047 return -EINVAL;
1048
1049 p->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
1050 p->parm.capture.timeperframe.numerator = 1;
1051 p->parm.capture.timeperframe.denominator = 60;
1052 p->parm.capture.readbuffers = 3;
1053 return 0;
1054}
1055
1056static int sur40_vidioc_enum_fmt(struct file *file, void *priv,
1057 struct v4l2_fmtdesc *f)
1058{
1059 if (f->index >= ARRAY_SIZE(sur40_pix_format))
1060 return -EINVAL;
1061
1062 f->pixelformat = sur40_pix_format[f->index].pixelformat;
1063 f->flags = 0;
1064 return 0;
1065}
1066
1067static int sur40_vidioc_enum_framesizes(struct file *file, void *priv,
1068 struct v4l2_frmsizeenum *f)
1069{
1070 struct sur40_state *sur40 = video_drvdata(file);
1071
1072 if ((f->index != 0) || ((f->pixel_format != V4L2_TCH_FMT_TU08)
1073 && (f->pixel_format != V4L2_PIX_FMT_GREY)))
1074 return -EINVAL;
1075
1076 f->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1077 f->discrete.width = sur40->pix_fmt.width;
1078 f->discrete.height = sur40->pix_fmt.height;
1079 return 0;
1080}
1081
1082static int sur40_vidioc_enum_frameintervals(struct file *file, void *priv,
1083 struct v4l2_frmivalenum *f)
1084{
1085 struct sur40_state *sur40 = video_drvdata(file);
1086
1087 if ((f->index > 0) || ((f->pixel_format != V4L2_TCH_FMT_TU08)
1088 && (f->pixel_format != V4L2_PIX_FMT_GREY))
1089 || (f->width != sur40->pix_fmt.width)
1090 || (f->height != sur40->pix_fmt.height))
1091 return -EINVAL;
1092
1093 f->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1094 f->discrete.denominator = 60;
1095 f->discrete.numerator = 1;
1096 return 0;
1097}
1098
1099
1100static const struct usb_device_id sur40_table[] = {
1101 { USB_DEVICE(ID_MICROSOFT, ID_SUR40) }, /* Samsung SUR40 */
1102 { } /* terminating null entry */
1103};
1104MODULE_DEVICE_TABLE(usb, sur40_table);
1105
1106/* V4L2 structures */
1107static const struct vb2_ops sur40_queue_ops = {
1108 .queue_setup = sur40_queue_setup,
1109 .buf_prepare = sur40_buffer_prepare,
1110 .buf_queue = sur40_buffer_queue,
1111 .start_streaming = sur40_start_streaming,
1112 .stop_streaming = sur40_stop_streaming,
1113};
1114
1115static const struct vb2_queue sur40_queue = {
1116 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1117 /*
1118 * VB2_USERPTR in currently not enabled: passing a user pointer to
1119 * dma-sg will result in segment sizes that are not a multiple of
1120 * 512 bytes, which is required by the host controller.
1121 */
1122 .io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF,
1123 .buf_struct_size = sizeof(struct sur40_buffer),
1124 .ops = &sur40_queue_ops,
1125 .mem_ops = &vb2_dma_sg_memops,
1126 .timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC,
1127 .min_queued_buffers = 3,
1128};
1129
1130static const struct v4l2_file_operations sur40_video_fops = {
1131 .owner = THIS_MODULE,
1132 .open = v4l2_fh_open,
1133 .release = vb2_fop_release,
1134 .unlocked_ioctl = video_ioctl2,
1135 .read = vb2_fop_read,
1136 .mmap = vb2_fop_mmap,
1137 .poll = vb2_fop_poll,
1138};
1139
1140static const struct v4l2_ioctl_ops sur40_video_ioctl_ops = {
1141
1142 .vidioc_querycap = sur40_vidioc_querycap,
1143
1144 .vidioc_enum_fmt_vid_cap = sur40_vidioc_enum_fmt,
1145 .vidioc_try_fmt_vid_cap = sur40_vidioc_try_fmt,
1146 .vidioc_s_fmt_vid_cap = sur40_vidioc_s_fmt,
1147 .vidioc_g_fmt_vid_cap = sur40_vidioc_g_fmt,
1148
1149 .vidioc_enum_framesizes = sur40_vidioc_enum_framesizes,
1150 .vidioc_enum_frameintervals = sur40_vidioc_enum_frameintervals,
1151
1152 .vidioc_g_parm = sur40_ioctl_parm,
1153 .vidioc_s_parm = sur40_ioctl_parm,
1154
1155 .vidioc_enum_input = sur40_vidioc_enum_input,
1156 .vidioc_g_input = sur40_vidioc_g_input,
1157 .vidioc_s_input = sur40_vidioc_s_input,
1158
1159 .vidioc_reqbufs = vb2_ioctl_reqbufs,
1160 .vidioc_create_bufs = vb2_ioctl_create_bufs,
1161 .vidioc_querybuf = vb2_ioctl_querybuf,
1162 .vidioc_qbuf = vb2_ioctl_qbuf,
1163 .vidioc_dqbuf = vb2_ioctl_dqbuf,
1164 .vidioc_expbuf = vb2_ioctl_expbuf,
1165
1166 .vidioc_streamon = vb2_ioctl_streamon,
1167 .vidioc_streamoff = vb2_ioctl_streamoff,
1168};
1169
1170static const struct video_device sur40_video_device = {
1171 .name = DRIVER_LONG,
1172 .fops = &sur40_video_fops,
1173 .ioctl_ops = &sur40_video_ioctl_ops,
1174 .release = video_device_release_empty,
1175 .device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TOUCH |
1176 V4L2_CAP_READWRITE | V4L2_CAP_STREAMING,
1177};
1178
1179/* USB-specific object needed to register this driver with the USB subsystem. */
1180static struct usb_driver sur40_driver = {
1181 .name = DRIVER_SHORT,
1182 .probe = sur40_probe,
1183 .disconnect = sur40_disconnect,
1184 .id_table = sur40_table,
1185};
1186
1187module_usb_driver(sur40_driver);
1188
1189MODULE_AUTHOR(DRIVER_AUTHOR);
1190MODULE_DESCRIPTION(DRIVER_DESC);
1191MODULE_LICENSE("GPL");