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 <floe@butterbrot.org>
6 *
7 * Derived from the USB Skeleton driver 1.1,
8 * Copyright (c) 2003 Greg Kroah-Hartman (greg@kroah.com)
9 *
10 * and from the Apple USB BCM5974 multitouch driver,
11 * Copyright (c) 2008 Henrik Rydberg (rydberg@euromail.se)
12 *
13 * and from the generic hid-multitouch driver,
14 * Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr>
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 <floe@butterbrot.org>"
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 FIXME: this is a guess? */
132#define MAX_CONTACTS 64
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: dev->usbdev, usb_rcvctrlpipe(dev->usbdev, 0),
259 request: command,
260 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
261 value: 0x00, index, data: buffer, size, timeout: 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: dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
271 SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
272 value: 0x32, index, NULL, size: 0, timeout: 1000);
273 if (result < 0)
274 goto error;
275 msleep(msecs: 5);
276
277 result = usb_control_msg(dev: dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
278 SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
279 value: 0x72, index: offset, NULL, size: 0, timeout: 1000);
280 if (result < 0)
281 goto error;
282 msleep(msecs: 5);
283
284 result = usb_control_msg(dev: dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
285 SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
286 value: 0xb2, index: value, NULL, size: 0, timeout: 1000);
287 if (result < 0)
288 goto error;
289 msleep(msecs: 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: dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
305 SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
306 value: 0x07, index: setting_07[value], NULL, size: 0, timeout: 1000);
307 if (result < 0)
308 goto error;
309 msleep(msecs: 5);
310
311 result = usb_control_msg(dev: dev->usbdev, usb_sndctrlpipe(dev->usbdev, 0),
312 SUR40_POKE, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
313 value: 0x17, index: setting_17[value], NULL, size: 0, timeout: 1000);
314 if (result < 0)
315 goto error;
316 msleep(msecs: 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(dev: handle, offset: 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(dev: handle, offset: 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(size: 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, index: 0x00, buffer, size: 12);
353 if (result < 0)
354 goto error;
355
356 result = sur40_command(dev, SUR40_GET_VERSION, index: 0x01, buffer, size: 12);
357 if (result < 0)
358 goto error;
359
360 result = sur40_command(dev, SUR40_GET_VERSION, index: 0x02, buffer, size: 12);
361 if (result < 0)
362 goto error;
363
364 result = sur40_command(dev, SUR40_SENSOR_CAPS, index: 0x00, buffer, size: 24);
365 if (result < 0)
366 goto error;
367
368 result = sur40_command(dev, SUR40_ACCEL_CAPS, index: 0x00, buffer, size: 5);
369 if (result < 0)
370 goto error;
371
372 result = sur40_command(dev, SUR40_GET_VERSION, index: 0x03, buffer, size: 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(objp: 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(dev: input);
395
396 dev_dbg(sur40->dev, "open\n");
397 return sur40_init(dev: 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(dev: 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(dev: input, key: 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(dev: input, slot: slotnum);
438 input_mt_report_slot_state(dev: input, MT_TOOL_FINGER, active: 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(dev: input, ABS_MT_POSITION_X, value: pos_x);
444 input_report_abs(dev: input, ABS_MT_POSITION_Y, value: pos_y);
445 input_report_abs(dev: input, ABS_MT_TOOL_X, value: ctr_x);
446 input_report_abs(dev: input, ABS_MT_TOOL_Y, value: ctr_y);
447
448 /* TODO: use a better orientation measure */
449 input_report_abs(dev: input, ABS_MT_ORIENTATION, value: wide);
450 input_report_abs(dev: input, ABS_MT_TOUCH_MAJOR, value: major);
451 input_report_abs(dev: input, ABS_MT_TOUCH_MINOR, value: 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(dev: 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(usb_dev: sur40->usbdev,
470 usb_rcvbulkpipe(sur40->usbdev, sur40->bulk_in_epaddr),
471 data: sur40->bulk_in_buffer, len: sur40->bulk_in_size,
472 actual_length: &bulk_read, timeout: 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(blob: &(inblob[i]), input);
517 }
518
519 } while (need_blobs > 0);
520
521 input_mt_sync_frame(dev: input);
522 input_sync(dev: 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(q: &sur40->queue))
538 return;
539
540 /* get a new buffer from the list */
541 spin_lock(lock: &sur40->qlock);
542 if (list_empty(head: &sur40->buf_list)) {
543 dev_dbg(sur40->dev, "buffer queue empty\n");
544 spin_unlock(lock: &sur40->qlock);
545 return;
546 }
547 new_buf = list_entry(sur40->buf_list.next, struct sur40_buffer, list);
548 list_del(entry: &new_buf->list);
549 spin_unlock(lock: &sur40->qlock);
550
551 dev_dbg(sur40->dev, "buffer acquired\n");
552
553 /* retrieve data via bulk read */
554 result = usb_bulk_msg(usb_dev: sur40->usbdev,
555 usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT),
556 data: sur40->bulk_in_buffer, len: sur40->bulk_in_size,
557 actual_length: &bulk_read, timeout: 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(vb: &new_buf->vb.vb2_buf, plane_no: 0);
583
584 result = usb_sg_init(io: &sgr, dev: sur40->usbdev,
585 usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT), period: 0,
586 sg: sgt->sgl, nents: sgt->nents, length: sur40->pix_fmt.sizeimage, mem_flags: 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(io: &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(vb: &new_buf->vb.vb2_buf, state: VB2_BUF_STATE_DONE);
609 dev_dbg(sur40->dev, "buffer marked done\n");
610 return;
611
612err_poll:
613 vb2_buffer_done(vb: &new_buf->vb.vb2_buf, state: 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(dev: input_dev, ABS_MT_POSITION_X,
622 min: 0, SENSOR_RES_X, fuzz: 0, flat: 0);
623 input_set_abs_params(dev: input_dev, ABS_MT_POSITION_Y,
624 min: 0, SENSOR_RES_Y, fuzz: 0, flat: 0);
625
626 input_set_abs_params(dev: input_dev, ABS_MT_TOOL_X,
627 min: 0, SENSOR_RES_X, fuzz: 0, flat: 0);
628 input_set_abs_params(dev: input_dev, ABS_MT_TOOL_Y,
629 min: 0, SENSOR_RES_Y, fuzz: 0, flat: 0);
630
631 /* max value unknown, but major/minor axis
632 * can never be larger than screen */
633 input_set_abs_params(dev: input_dev, ABS_MT_TOUCH_MAJOR,
634 min: 0, SENSOR_RES_X, fuzz: 0, flat: 0);
635 input_set_abs_params(dev: input_dev, ABS_MT_TOUCH_MINOR,
636 min: 0, SENSOR_RES_Y, fuzz: 0, flat: 0);
637
638 input_set_abs_params(dev: input_dev, ABS_MT_ORIENTATION, min: 0, max: 1, fuzz: 0, flat: 0);
639
640 error = input_mt_init_slots(dev: 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(size: sizeof(struct sur40_state), GFP_KERNEL);
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(list: &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(dev: usbdev, id: &input->id);
693 usb_make_path(dev: usbdev, buf: sur40->phys, size: sizeof(sur40->phys));
694 strlcat(p: sur40->phys, q: "/input0", avail: 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_dev: input);
702 if (error)
703 goto err_free_input;
704
705 input_set_drvdata(dev: input, data: sur40);
706 error = input_setup_polling(dev: input, poll_fn: 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(dev: 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(epd: endpoint);
720 sur40->bulk_in_epaddr = endpoint->bEndpointAddress;
721 sur40->bulk_in_buffer = kmalloc(size: 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 polled input device */
729 error = input_register_device(input);
730 if (error) {
731 dev_err(&interface->dev,
732 "Unable to register polled input device.");
733 goto err_free_buffer;
734 }
735
736 /* register the video master device */
737 snprintf(buf: sur40->v4l2.name, size: sizeof(sur40->v4l2.name), fmt: "%s", DRIVER_LONG);
738 error = v4l2_device_register(dev: sur40->dev, v4l2_dev: &sur40->v4l2);
739 if (error) {
740 dev_err(&interface->dev,
741 "Unable to register video master device.");
742 goto err_unreg_v4l2;
743 }
744
745 /* initialize the lock and subdevice */
746 sur40->queue = sur40_queue;
747 sur40->queue.drv_priv = sur40;
748 sur40->queue.lock = &sur40->lock;
749 sur40->queue.dev = sur40->dev;
750
751 /* initialize the queue */
752 error = vb2_queue_init(q: &sur40->queue);
753 if (error)
754 goto err_unreg_v4l2;
755
756 sur40->pix_fmt = sur40_pix_format[0];
757 sur40->vdev = sur40_video_device;
758 sur40->vdev.v4l2_dev = &sur40->v4l2;
759 sur40->vdev.lock = &sur40->lock;
760 sur40->vdev.queue = &sur40->queue;
761 video_set_drvdata(vdev: &sur40->vdev, data: sur40);
762
763 /* initialize the control handler for 4 controls */
764 v4l2_ctrl_handler_init(&sur40->hdl, 4);
765 sur40->v4l2.ctrl_handler = &sur40->hdl;
766 sur40->vsvideo = (SUR40_CONTRAST_DEF << 4) | SUR40_GAIN_DEF;
767
768 v4l2_ctrl_new_std(hdl: &sur40->hdl, ops: &sur40_ctrl_ops, V4L2_CID_BRIGHTNESS,
769 SUR40_BRIGHTNESS_MIN, SUR40_BRIGHTNESS_MAX, step: 1, clamp(brightness,
770 (uint)SUR40_BRIGHTNESS_MIN, (uint)SUR40_BRIGHTNESS_MAX));
771
772 v4l2_ctrl_new_std(hdl: &sur40->hdl, ops: &sur40_ctrl_ops, V4L2_CID_CONTRAST,
773 SUR40_CONTRAST_MIN, SUR40_CONTRAST_MAX, step: 1, clamp(contrast,
774 (uint)SUR40_CONTRAST_MIN, (uint)SUR40_CONTRAST_MAX));
775
776 v4l2_ctrl_new_std(hdl: &sur40->hdl, ops: &sur40_ctrl_ops, V4L2_CID_GAIN,
777 SUR40_GAIN_MIN, SUR40_GAIN_MAX, step: 1, clamp(gain,
778 (uint)SUR40_GAIN_MIN, (uint)SUR40_GAIN_MAX));
779
780 v4l2_ctrl_new_std(hdl: &sur40->hdl, ops: &sur40_ctrl_ops,
781 V4L2_CID_BACKLIGHT_COMPENSATION, SUR40_BACKLIGHT_MIN,
782 SUR40_BACKLIGHT_MAX, step: 1, SUR40_BACKLIGHT_DEF);
783
784 v4l2_ctrl_handler_setup(hdl: &sur40->hdl);
785
786 if (sur40->hdl.error) {
787 dev_err(&interface->dev,
788 "Unable to register video controls.");
789 v4l2_ctrl_handler_free(hdl: &sur40->hdl);
790 error = sur40->hdl.error;
791 goto err_unreg_v4l2;
792 }
793
794 error = video_register_device(vdev: &sur40->vdev, type: VFL_TYPE_TOUCH, nr: -1);
795 if (error) {
796 dev_err(&interface->dev,
797 "Unable to register video subdevice.");
798 goto err_unreg_video;
799 }
800
801 /* we can register the device now, as it is ready */
802 usb_set_intfdata(intf: interface, data: 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(vdev: &sur40->vdev);
809err_unreg_v4l2:
810 v4l2_device_unregister(v4l2_dev: &sur40->v4l2);
811err_free_buffer:
812 kfree(objp: sur40->bulk_in_buffer);
813err_free_input:
814 input_free_device(dev: input);
815err_free_dev:
816 kfree(objp: sur40);
817
818 return error;
819}
820
821/* Unregister device & clean up. */
822static void sur40_disconnect(struct usb_interface *interface)
823{
824 struct sur40_state *sur40 = usb_get_intfdata(intf: interface);
825
826 v4l2_ctrl_handler_free(hdl: &sur40->hdl);
827 video_unregister_device(vdev: &sur40->vdev);
828 v4l2_device_unregister(v4l2_dev: &sur40->v4l2);
829
830 input_unregister_device(sur40->input);
831 kfree(objp: sur40->bulk_in_buffer);
832 kfree(objp: sur40);
833
834 usb_set_intfdata(intf: interface, NULL);
835 dev_dbg(&interface->dev, "%s is now disconnected\n", DRIVER_DESC);
836}
837
838/*
839 * Setup the constraints of the queue: besides setting the number of planes
840 * per buffer and the size and allocation context of each plane, it also
841 * checks if sufficient buffers have been allocated. Usually 3 is a good
842 * minimum number: many DMA engines need a minimum of 2 buffers in the
843 * queue and you need to have another available for userspace processing.
844 */
845static int sur40_queue_setup(struct vb2_queue *q,
846 unsigned int *nbuffers, unsigned int *nplanes,
847 unsigned int sizes[], struct device *alloc_devs[])
848{
849 struct sur40_state *sur40 = vb2_get_drv_priv(q);
850
851 if (q->num_buffers + *nbuffers < 3)
852 *nbuffers = 3 - q->num_buffers;
853
854 if (*nplanes)
855 return sizes[0] < sur40->pix_fmt.sizeimage ? -EINVAL : 0;
856
857 *nplanes = 1;
858 sizes[0] = sur40->pix_fmt.sizeimage;
859
860 return 0;
861}
862
863/*
864 * Prepare the buffer for queueing to the DMA engine: check and set the
865 * payload size.
866 */
867static int sur40_buffer_prepare(struct vb2_buffer *vb)
868{
869 struct sur40_state *sur40 = vb2_get_drv_priv(q: vb->vb2_queue);
870 unsigned long size = sur40->pix_fmt.sizeimage;
871
872 if (vb2_plane_size(vb, plane_no: 0) < size) {
873 dev_err(&sur40->usbdev->dev, "buffer too small (%lu < %lu)\n",
874 vb2_plane_size(vb, 0), size);
875 return -EINVAL;
876 }
877
878 vb2_set_plane_payload(vb, plane_no: 0, size);
879 return 0;
880}
881
882/*
883 * Queue this buffer to the DMA engine.
884 */
885static void sur40_buffer_queue(struct vb2_buffer *vb)
886{
887 struct sur40_state *sur40 = vb2_get_drv_priv(q: vb->vb2_queue);
888 struct sur40_buffer *buf = (struct sur40_buffer *)vb;
889
890 spin_lock(lock: &sur40->qlock);
891 list_add_tail(new: &buf->list, head: &sur40->buf_list);
892 spin_unlock(lock: &sur40->qlock);
893}
894
895static void return_all_buffers(struct sur40_state *sur40,
896 enum vb2_buffer_state state)
897{
898 struct sur40_buffer *buf, *node;
899
900 spin_lock(lock: &sur40->qlock);
901 list_for_each_entry_safe(buf, node, &sur40->buf_list, list) {
902 vb2_buffer_done(vb: &buf->vb.vb2_buf, state);
903 list_del(entry: &buf->list);
904 }
905 spin_unlock(lock: &sur40->qlock);
906}
907
908/*
909 * Start streaming. First check if the minimum number of buffers have been
910 * queued. If not, then return -ENOBUFS and the vb2 framework will call
911 * this function again the next time a buffer has been queued until enough
912 * buffers are available to actually start the DMA engine.
913 */
914static int sur40_start_streaming(struct vb2_queue *vq, unsigned int count)
915{
916 struct sur40_state *sur40 = vb2_get_drv_priv(q: vq);
917
918 sur40->sequence = 0;
919 return 0;
920}
921
922/*
923 * Stop the DMA engine. Any remaining buffers in the DMA queue are dequeued
924 * and passed on to the vb2 framework marked as STATE_ERROR.
925 */
926static void sur40_stop_streaming(struct vb2_queue *vq)
927{
928 struct sur40_state *sur40 = vb2_get_drv_priv(q: vq);
929 vb2_wait_for_all_buffers(q: vq);
930 sur40->sequence = -1;
931
932 /* Release all active buffers */
933 return_all_buffers(sur40, state: VB2_BUF_STATE_ERROR);
934}
935
936/* V4L ioctl */
937static int sur40_vidioc_querycap(struct file *file, void *priv,
938 struct v4l2_capability *cap)
939{
940 struct sur40_state *sur40 = video_drvdata(file);
941
942 strscpy(p: cap->driver, DRIVER_SHORT, size: sizeof(cap->driver));
943 strscpy(p: cap->card, DRIVER_LONG, size: sizeof(cap->card));
944 usb_make_path(dev: sur40->usbdev, buf: cap->bus_info, size: sizeof(cap->bus_info));
945 return 0;
946}
947
948static int sur40_vidioc_enum_input(struct file *file, void *priv,
949 struct v4l2_input *i)
950{
951 if (i->index != 0)
952 return -EINVAL;
953 i->type = V4L2_INPUT_TYPE_TOUCH;
954 i->std = V4L2_STD_UNKNOWN;
955 strscpy(p: i->name, q: "In-Cell Sensor", size: sizeof(i->name));
956 i->capabilities = 0;
957 return 0;
958}
959
960static int sur40_vidioc_s_input(struct file *file, void *priv, unsigned int i)
961{
962 return (i == 0) ? 0 : -EINVAL;
963}
964
965static int sur40_vidioc_g_input(struct file *file, void *priv, unsigned int *i)
966{
967 *i = 0;
968 return 0;
969}
970
971static int sur40_vidioc_try_fmt(struct file *file, void *priv,
972 struct v4l2_format *f)
973{
974 switch (f->fmt.pix.pixelformat) {
975 case V4L2_PIX_FMT_GREY:
976 f->fmt.pix = sur40_pix_format[1];
977 break;
978
979 default:
980 f->fmt.pix = sur40_pix_format[0];
981 break;
982 }
983
984 return 0;
985}
986
987static int sur40_vidioc_s_fmt(struct file *file, void *priv,
988 struct v4l2_format *f)
989{
990 struct sur40_state *sur40 = video_drvdata(file);
991
992 switch (f->fmt.pix.pixelformat) {
993 case V4L2_PIX_FMT_GREY:
994 sur40->pix_fmt = sur40_pix_format[1];
995 break;
996
997 default:
998 sur40->pix_fmt = sur40_pix_format[0];
999 break;
1000 }
1001
1002 f->fmt.pix = sur40->pix_fmt;
1003 return 0;
1004}
1005
1006static 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
1015static 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(handle: sur40, value: ctrl->val);
1024 break;
1025 case V4L2_CID_CONTRAST:
1026 value = (value & 0x0f) | (ctrl->val << 4);
1027 sur40_set_vsvideo(handle: sur40, value);
1028 break;
1029 case V4L2_CID_GAIN:
1030 value = (value & 0xf0) | (ctrl->val);
1031 sur40_set_vsvideo(handle: sur40, value);
1032 break;
1033 case V4L2_CID_BACKLIGHT_COMPENSATION:
1034 sur40_set_preprocessor(dev: sur40, value: ctrl->val);
1035 break;
1036 }
1037 return 0;
1038}
1039
1040static 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
1053static 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
1064static 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
1079static 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
1097static const struct usb_device_id sur40_table[] = {
1098 { USB_DEVICE(ID_MICROSOFT, ID_SUR40) }, /* Samsung SUR40 */
1099 { } /* terminating null entry */
1100};
1101MODULE_DEVICE_TABLE(usb, sur40_table);
1102
1103/* V4L2 structures */
1104static 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
1114static 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
1129static 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
1139static 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
1169static 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. */
1179static struct usb_driver sur40_driver = {
1180 .name = DRIVER_SHORT,
1181 .probe = sur40_probe,
1182 .disconnect = sur40_disconnect,
1183 .id_table = sur40_table,
1184};
1185
1186module_usb_driver(sur40_driver);
1187
1188MODULE_AUTHOR(DRIVER_AUTHOR);
1189MODULE_DESCRIPTION(DRIVER_DESC);
1190MODULE_LICENSE("GPL");
1191

source code of linux/drivers/input/touchscreen/sur40.c