1 /* 2 * Copyright (c) 2012-2015 Synaptics Incorporated 3 * Copyright (C) 2016 Zodiac Inflight Innovations 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 as published by 7 * the Free Software Foundation. 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/rmi.h> 12 #include <linux/input.h> 13 #include <linux/slab.h> 14 #include <linux/delay.h> 15 #include <linux/i2c.h> 16 #include <media/v4l2-device.h> 17 #include <media/v4l2-ioctl.h> 18 #include <media/videobuf2-v4l2.h> 19 #include <media/videobuf2-vmalloc.h> 20 #include "rmi_driver.h" 21 22 #define F54_NAME "rmi4_f54" 23 24 /* F54 data offsets */ 25 #define F54_REPORT_DATA_OFFSET 3 26 #define F54_FIFO_OFFSET 1 27 #define F54_NUM_TX_OFFSET 1 28 #define F54_NUM_RX_OFFSET 0 29 30 /* F54 commands */ 31 #define F54_GET_REPORT 1 32 #define F54_FORCE_CAL 2 33 34 /* F54 capabilities */ 35 #define F54_CAP_BASELINE (1 << 2) 36 #define F54_CAP_IMAGE8 (1 << 3) 37 #define F54_CAP_IMAGE16 (1 << 6) 38 39 /** 40 * enum rmi_f54_report_type - RMI4 F54 report types 41 * 42 * @F54_8BIT_IMAGE: Normalized 8-Bit Image Report. The capacitance variance 43 * from baseline for each pixel. 44 * 45 * @F54_16BIT_IMAGE: Normalized 16-Bit Image Report. The capacitance variance 46 * from baseline for each pixel. 47 * 48 * @F54_RAW_16BIT_IMAGE: 49 * Raw 16-Bit Image Report. The raw capacitance for each 50 * pixel. 51 * 52 * @F54_TRUE_BASELINE: True Baseline Report. The baseline capacitance for each 53 * pixel. 54 * 55 * @F54_FULL_RAW_CAP: Full Raw Capacitance Report. The raw capacitance with 56 * low reference set to its minimum value and high 57 * reference set to its maximum value. 58 * 59 * @F54_FULL_RAW_CAP_RX_OFFSET_REMOVED: 60 * Full Raw Capacitance with Receiver Offset Removed 61 * Report. Set Low reference to its minimum value and high 62 * references to its maximum value, then report the raw 63 * capacitance for each pixel. 64 */ 65 enum rmi_f54_report_type { 66 F54_REPORT_NONE = 0, 67 F54_8BIT_IMAGE = 1, 68 F54_16BIT_IMAGE = 2, 69 F54_RAW_16BIT_IMAGE = 3, 70 F54_TRUE_BASELINE = 9, 71 F54_FULL_RAW_CAP = 19, 72 F54_FULL_RAW_CAP_RX_OFFSET_REMOVED = 20, 73 F54_MAX_REPORT_TYPE, 74 }; 75 76 const char *rmi_f54_report_type_names[] = { 77 [F54_REPORT_NONE] = "Unknown", 78 [F54_8BIT_IMAGE] = "Normalized 8-Bit Image", 79 [F54_16BIT_IMAGE] = "Normalized 16-Bit Image", 80 [F54_RAW_16BIT_IMAGE] = "Raw 16-Bit Image", 81 [F54_TRUE_BASELINE] = "True Baseline", 82 [F54_FULL_RAW_CAP] = "Full Raw Capacitance", 83 [F54_FULL_RAW_CAP_RX_OFFSET_REMOVED] 84 = "Full Raw Capacitance RX Offset Removed", 85 }; 86 87 struct rmi_f54_reports { 88 int start; 89 int size; 90 }; 91 92 struct f54_data { 93 struct rmi_function *fn; 94 95 u8 num_rx_electrodes; 96 u8 num_tx_electrodes; 97 u8 capabilities; 98 u16 clock_rate; 99 u8 family; 100 101 enum rmi_f54_report_type report_type; 102 u8 *report_data; 103 int report_size; 104 struct rmi_f54_reports standard_report[2]; 105 106 bool is_busy; 107 struct mutex status_mutex; 108 struct mutex data_mutex; 109 110 struct workqueue_struct *workqueue; 111 struct delayed_work work; 112 unsigned long timeout; 113 114 struct completion cmd_done; 115 116 /* V4L2 support */ 117 struct v4l2_device v4l2; 118 struct v4l2_pix_format format; 119 struct video_device vdev; 120 struct vb2_queue queue; 121 struct mutex lock; 122 int input; 123 enum rmi_f54_report_type inputs[F54_MAX_REPORT_TYPE]; 124 }; 125 126 /* 127 * Basic checks on report_type to ensure we write a valid type 128 * to the sensor. 129 */ 130 static bool is_f54_report_type_valid(struct f54_data *f54, 131 enum rmi_f54_report_type reptype) 132 { 133 switch (reptype) { 134 case F54_8BIT_IMAGE: 135 return f54->capabilities & F54_CAP_IMAGE8; 136 case F54_16BIT_IMAGE: 137 case F54_RAW_16BIT_IMAGE: 138 return f54->capabilities & F54_CAP_IMAGE16; 139 case F54_TRUE_BASELINE: 140 return f54->capabilities & F54_CAP_IMAGE16; 141 case F54_FULL_RAW_CAP: 142 case F54_FULL_RAW_CAP_RX_OFFSET_REMOVED: 143 return true; 144 default: 145 return false; 146 } 147 } 148 149 static enum rmi_f54_report_type rmi_f54_get_reptype(struct f54_data *f54, 150 unsigned int i) 151 { 152 if (i >= F54_MAX_REPORT_TYPE) 153 return F54_REPORT_NONE; 154 155 return f54->inputs[i]; 156 } 157 158 static void rmi_f54_create_input_map(struct f54_data *f54) 159 { 160 int i = 0; 161 enum rmi_f54_report_type reptype; 162 163 for (reptype = 1; reptype < F54_MAX_REPORT_TYPE; reptype++) { 164 if (!is_f54_report_type_valid(f54, reptype)) 165 continue; 166 167 f54->inputs[i++] = reptype; 168 } 169 170 /* Remaining values are zero via kzalloc */ 171 } 172 173 static int rmi_f54_request_report(struct rmi_function *fn, u8 report_type) 174 { 175 struct f54_data *f54 = dev_get_drvdata(&fn->dev); 176 struct rmi_device *rmi_dev = fn->rmi_dev; 177 int error; 178 179 /* Write Report Type into F54_AD_Data0 */ 180 if (f54->report_type != report_type) { 181 error = rmi_write(rmi_dev, f54->fn->fd.data_base_addr, 182 report_type); 183 if (error) 184 return error; 185 f54->report_type = report_type; 186 } 187 188 /* 189 * Small delay after disabling interrupts to avoid race condition 190 * in firmare. This value is a bit higher than absolutely necessary. 191 * Should be removed once issue is resolved in firmware. 192 */ 193 usleep_range(2000, 3000); 194 195 mutex_lock(&f54->data_mutex); 196 197 error = rmi_write(rmi_dev, fn->fd.command_base_addr, F54_GET_REPORT); 198 if (error < 0) 199 goto unlock; 200 201 init_completion(&f54->cmd_done); 202 203 f54->is_busy = 1; 204 f54->timeout = jiffies + msecs_to_jiffies(100); 205 206 queue_delayed_work(f54->workqueue, &f54->work, 0); 207 208 unlock: 209 mutex_unlock(&f54->data_mutex); 210 211 return error; 212 } 213 214 static size_t rmi_f54_get_report_size(struct f54_data *f54) 215 { 216 struct rmi_device *rmi_dev = f54->fn->rmi_dev; 217 struct rmi_driver_data *drv_data = dev_get_drvdata(&rmi_dev->dev); 218 u8 rx = drv_data->num_rx_electrodes ? : f54->num_rx_electrodes; 219 u8 tx = drv_data->num_tx_electrodes ? : f54->num_tx_electrodes; 220 size_t size; 221 222 switch (rmi_f54_get_reptype(f54, f54->input)) { 223 case F54_8BIT_IMAGE: 224 size = rx * tx; 225 break; 226 case F54_16BIT_IMAGE: 227 case F54_RAW_16BIT_IMAGE: 228 case F54_TRUE_BASELINE: 229 case F54_FULL_RAW_CAP: 230 case F54_FULL_RAW_CAP_RX_OFFSET_REMOVED: 231 size = sizeof(u16) * rx * tx; 232 break; 233 default: 234 size = 0; 235 } 236 237 return size; 238 } 239 240 static int rmi_f54_get_pixel_fmt(enum rmi_f54_report_type reptype, u32 *pixfmt) 241 { 242 int ret = 0; 243 244 switch (reptype) { 245 case F54_8BIT_IMAGE: 246 *pixfmt = V4L2_TCH_FMT_DELTA_TD08; 247 break; 248 249 case F54_16BIT_IMAGE: 250 *pixfmt = V4L2_TCH_FMT_DELTA_TD16; 251 break; 252 253 case F54_RAW_16BIT_IMAGE: 254 case F54_TRUE_BASELINE: 255 case F54_FULL_RAW_CAP: 256 case F54_FULL_RAW_CAP_RX_OFFSET_REMOVED: 257 *pixfmt = V4L2_TCH_FMT_TU16; 258 break; 259 260 case F54_REPORT_NONE: 261 case F54_MAX_REPORT_TYPE: 262 ret = -EINVAL; 263 break; 264 } 265 266 return ret; 267 } 268 269 static const struct v4l2_file_operations rmi_f54_video_fops = { 270 .owner = THIS_MODULE, 271 .open = v4l2_fh_open, 272 .release = vb2_fop_release, 273 .unlocked_ioctl = video_ioctl2, 274 .read = vb2_fop_read, 275 .mmap = vb2_fop_mmap, 276 .poll = vb2_fop_poll, 277 }; 278 279 static int rmi_f54_queue_setup(struct vb2_queue *q, unsigned int *nbuffers, 280 unsigned int *nplanes, unsigned int sizes[], 281 struct device *alloc_devs[]) 282 { 283 struct f54_data *f54 = q->drv_priv; 284 285 if (*nplanes) 286 return sizes[0] < rmi_f54_get_report_size(f54) ? -EINVAL : 0; 287 288 *nplanes = 1; 289 sizes[0] = rmi_f54_get_report_size(f54); 290 291 return 0; 292 } 293 294 static void rmi_f54_buffer_queue(struct vb2_buffer *vb) 295 { 296 struct f54_data *f54 = vb2_get_drv_priv(vb->vb2_queue); 297 u16 *ptr; 298 enum vb2_buffer_state state; 299 enum rmi_f54_report_type reptype; 300 int ret; 301 302 mutex_lock(&f54->status_mutex); 303 304 reptype = rmi_f54_get_reptype(f54, f54->input); 305 if (reptype == F54_REPORT_NONE) { 306 state = VB2_BUF_STATE_ERROR; 307 goto done; 308 } 309 310 if (f54->is_busy) { 311 state = VB2_BUF_STATE_ERROR; 312 goto done; 313 } 314 315 ret = rmi_f54_request_report(f54->fn, reptype); 316 if (ret) { 317 dev_err(&f54->fn->dev, "Error requesting F54 report\n"); 318 state = VB2_BUF_STATE_ERROR; 319 goto done; 320 } 321 322 /* get frame data */ 323 mutex_lock(&f54->data_mutex); 324 325 while (f54->is_busy) { 326 mutex_unlock(&f54->data_mutex); 327 if (!wait_for_completion_timeout(&f54->cmd_done, 328 msecs_to_jiffies(1000))) { 329 dev_err(&f54->fn->dev, "Timed out\n"); 330 state = VB2_BUF_STATE_ERROR; 331 goto done; 332 } 333 mutex_lock(&f54->data_mutex); 334 } 335 336 ptr = vb2_plane_vaddr(vb, 0); 337 if (!ptr) { 338 dev_err(&f54->fn->dev, "Error acquiring frame ptr\n"); 339 state = VB2_BUF_STATE_ERROR; 340 goto data_done; 341 } 342 343 memcpy(ptr, f54->report_data, f54->report_size); 344 vb2_set_plane_payload(vb, 0, rmi_f54_get_report_size(f54)); 345 state = VB2_BUF_STATE_DONE; 346 347 data_done: 348 mutex_unlock(&f54->data_mutex); 349 done: 350 vb2_buffer_done(vb, state); 351 mutex_unlock(&f54->status_mutex); 352 } 353 354 /* V4L2 structures */ 355 static const struct vb2_ops rmi_f54_queue_ops = { 356 .queue_setup = rmi_f54_queue_setup, 357 .buf_queue = rmi_f54_buffer_queue, 358 .wait_prepare = vb2_ops_wait_prepare, 359 .wait_finish = vb2_ops_wait_finish, 360 }; 361 362 static const struct vb2_queue rmi_f54_queue = { 363 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE, 364 .io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF | VB2_READ, 365 .buf_struct_size = sizeof(struct vb2_buffer), 366 .ops = &rmi_f54_queue_ops, 367 .mem_ops = &vb2_vmalloc_memops, 368 .timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC, 369 .min_buffers_needed = 1, 370 }; 371 372 static int rmi_f54_vidioc_querycap(struct file *file, void *priv, 373 struct v4l2_capability *cap) 374 { 375 struct f54_data *f54 = video_drvdata(file); 376 377 strlcpy(cap->driver, F54_NAME, sizeof(cap->driver)); 378 strlcpy(cap->card, SYNAPTICS_INPUT_DEVICE_NAME, sizeof(cap->card)); 379 snprintf(cap->bus_info, sizeof(cap->bus_info), 380 "rmi4:%s", dev_name(&f54->fn->dev)); 381 382 return 0; 383 } 384 385 static int rmi_f54_vidioc_enum_input(struct file *file, void *priv, 386 struct v4l2_input *i) 387 { 388 struct f54_data *f54 = video_drvdata(file); 389 enum rmi_f54_report_type reptype; 390 391 reptype = rmi_f54_get_reptype(f54, i->index); 392 if (reptype == F54_REPORT_NONE) 393 return -EINVAL; 394 395 i->type = V4L2_INPUT_TYPE_TOUCH; 396 397 strlcpy(i->name, rmi_f54_report_type_names[reptype], sizeof(i->name)); 398 return 0; 399 } 400 401 static int rmi_f54_set_input(struct f54_data *f54, unsigned int i) 402 { 403 struct rmi_device *rmi_dev = f54->fn->rmi_dev; 404 struct rmi_driver_data *drv_data = dev_get_drvdata(&rmi_dev->dev); 405 u8 rx = drv_data->num_rx_electrodes ? : f54->num_rx_electrodes; 406 u8 tx = drv_data->num_tx_electrodes ? : f54->num_tx_electrodes; 407 struct v4l2_pix_format *f = &f54->format; 408 enum rmi_f54_report_type reptype; 409 int ret; 410 411 reptype = rmi_f54_get_reptype(f54, i); 412 if (reptype == F54_REPORT_NONE) 413 return -EINVAL; 414 415 ret = rmi_f54_get_pixel_fmt(reptype, &f->pixelformat); 416 if (ret) 417 return ret; 418 419 f54->input = i; 420 421 f->width = rx; 422 f->height = tx; 423 f->field = V4L2_FIELD_NONE; 424 f->colorspace = V4L2_COLORSPACE_RAW; 425 f->bytesperline = f->width * sizeof(u16); 426 f->sizeimage = f->width * f->height * sizeof(u16); 427 428 return 0; 429 } 430 431 static int rmi_f54_vidioc_s_input(struct file *file, void *priv, unsigned int i) 432 { 433 return rmi_f54_set_input(video_drvdata(file), i); 434 } 435 436 static int rmi_f54_vidioc_g_input(struct file *file, void *priv, 437 unsigned int *i) 438 { 439 struct f54_data *f54 = video_drvdata(file); 440 441 *i = f54->input; 442 443 return 0; 444 } 445 446 static int rmi_f54_vidioc_fmt(struct file *file, void *priv, 447 struct v4l2_format *f) 448 { 449 struct f54_data *f54 = video_drvdata(file); 450 451 f->fmt.pix = f54->format; 452 453 return 0; 454 } 455 456 static int rmi_f54_vidioc_enum_fmt(struct file *file, void *priv, 457 struct v4l2_fmtdesc *fmt) 458 { 459 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 460 return -EINVAL; 461 462 switch (fmt->index) { 463 case 0: 464 fmt->pixelformat = V4L2_TCH_FMT_DELTA_TD16; 465 break; 466 467 case 1: 468 fmt->pixelformat = V4L2_TCH_FMT_DELTA_TD08; 469 break; 470 471 case 2: 472 fmt->pixelformat = V4L2_TCH_FMT_TU16; 473 break; 474 475 default: 476 return -EINVAL; 477 } 478 479 return 0; 480 } 481 482 static int rmi_f54_vidioc_g_parm(struct file *file, void *fh, 483 struct v4l2_streamparm *a) 484 { 485 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 486 return -EINVAL; 487 488 a->parm.capture.readbuffers = 1; 489 a->parm.capture.timeperframe.numerator = 1; 490 a->parm.capture.timeperframe.denominator = 10; 491 return 0; 492 } 493 494 static const struct v4l2_ioctl_ops rmi_f54_video_ioctl_ops = { 495 .vidioc_querycap = rmi_f54_vidioc_querycap, 496 497 .vidioc_enum_fmt_vid_cap = rmi_f54_vidioc_enum_fmt, 498 .vidioc_s_fmt_vid_cap = rmi_f54_vidioc_fmt, 499 .vidioc_g_fmt_vid_cap = rmi_f54_vidioc_fmt, 500 .vidioc_try_fmt_vid_cap = rmi_f54_vidioc_fmt, 501 .vidioc_g_parm = rmi_f54_vidioc_g_parm, 502 503 .vidioc_enum_input = rmi_f54_vidioc_enum_input, 504 .vidioc_g_input = rmi_f54_vidioc_g_input, 505 .vidioc_s_input = rmi_f54_vidioc_s_input, 506 507 .vidioc_reqbufs = vb2_ioctl_reqbufs, 508 .vidioc_create_bufs = vb2_ioctl_create_bufs, 509 .vidioc_querybuf = vb2_ioctl_querybuf, 510 .vidioc_qbuf = vb2_ioctl_qbuf, 511 .vidioc_dqbuf = vb2_ioctl_dqbuf, 512 .vidioc_expbuf = vb2_ioctl_expbuf, 513 514 .vidioc_streamon = vb2_ioctl_streamon, 515 .vidioc_streamoff = vb2_ioctl_streamoff, 516 }; 517 518 static const struct video_device rmi_f54_video_device = { 519 .name = "Synaptics RMI4", 520 .fops = &rmi_f54_video_fops, 521 .ioctl_ops = &rmi_f54_video_ioctl_ops, 522 .release = video_device_release_empty, 523 .device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TOUCH | 524 V4L2_CAP_READWRITE | V4L2_CAP_STREAMING, 525 }; 526 527 static void rmi_f54_work(struct work_struct *work) 528 { 529 struct f54_data *f54 = container_of(work, struct f54_data, work.work); 530 struct rmi_function *fn = f54->fn; 531 u8 fifo[2]; 532 struct rmi_f54_reports *report; 533 int report_size; 534 u8 command; 535 u8 *data; 536 int error; 537 538 data = f54->report_data; 539 report_size = rmi_f54_get_report_size(f54); 540 if (report_size == 0) { 541 dev_err(&fn->dev, "Bad report size, report type=%d\n", 542 f54->report_type); 543 error = -EINVAL; 544 goto error; /* retry won't help */ 545 } 546 f54->standard_report[0].size = report_size; 547 report = f54->standard_report; 548 549 mutex_lock(&f54->data_mutex); 550 551 /* 552 * Need to check if command has completed. 553 * If not try again later. 554 */ 555 error = rmi_read(fn->rmi_dev, f54->fn->fd.command_base_addr, 556 &command); 557 if (error) { 558 dev_err(&fn->dev, "Failed to read back command\n"); 559 goto error; 560 } 561 if (command & F54_GET_REPORT) { 562 if (time_after(jiffies, f54->timeout)) { 563 dev_err(&fn->dev, "Get report command timed out\n"); 564 error = -ETIMEDOUT; 565 } 566 report_size = 0; 567 goto error; 568 } 569 570 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "Get report command completed, reading data\n"); 571 572 report_size = 0; 573 for (; report->size; report++) { 574 fifo[0] = report->start & 0xff; 575 fifo[1] = (report->start >> 8) & 0xff; 576 error = rmi_write_block(fn->rmi_dev, 577 fn->fd.data_base_addr + F54_FIFO_OFFSET, 578 fifo, sizeof(fifo)); 579 if (error) { 580 dev_err(&fn->dev, "Failed to set fifo start offset\n"); 581 goto abort; 582 } 583 584 error = rmi_read_block(fn->rmi_dev, fn->fd.data_base_addr + 585 F54_REPORT_DATA_OFFSET, data, 586 report->size); 587 if (error) { 588 dev_err(&fn->dev, "%s: read [%d bytes] returned %d\n", 589 __func__, report->size, error); 590 goto abort; 591 } 592 data += report->size; 593 report_size += report->size; 594 } 595 596 abort: 597 f54->report_size = error ? 0 : report_size; 598 error: 599 if (error) 600 report_size = 0; 601 602 if (report_size == 0 && !error) { 603 queue_delayed_work(f54->workqueue, &f54->work, 604 msecs_to_jiffies(1)); 605 } else { 606 f54->is_busy = false; 607 complete(&f54->cmd_done); 608 } 609 610 mutex_unlock(&f54->data_mutex); 611 } 612 613 static int rmi_f54_attention(struct rmi_function *fn, unsigned long *irqbits) 614 { 615 return 0; 616 } 617 618 static int rmi_f54_config(struct rmi_function *fn) 619 { 620 struct rmi_driver *drv = fn->rmi_dev->driver; 621 622 drv->set_irq_bits(fn->rmi_dev, fn->irq_mask); 623 624 return 0; 625 } 626 627 static int rmi_f54_detect(struct rmi_function *fn) 628 { 629 int error; 630 struct f54_data *f54; 631 u8 buf[6]; 632 633 f54 = dev_get_drvdata(&fn->dev); 634 635 error = rmi_read_block(fn->rmi_dev, fn->fd.query_base_addr, 636 buf, sizeof(buf)); 637 if (error) { 638 dev_err(&fn->dev, "%s: Failed to query F54 properties\n", 639 __func__); 640 return error; 641 } 642 643 f54->num_rx_electrodes = buf[0]; 644 f54->num_tx_electrodes = buf[1]; 645 f54->capabilities = buf[2]; 646 f54->clock_rate = buf[3] | (buf[4] << 8); 647 f54->family = buf[5]; 648 649 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 num_rx_electrodes: %d\n", 650 f54->num_rx_electrodes); 651 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 num_tx_electrodes: %d\n", 652 f54->num_tx_electrodes); 653 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 capabilities: 0x%x\n", 654 f54->capabilities); 655 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 clock rate: 0x%x\n", 656 f54->clock_rate); 657 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 family: 0x%x\n", 658 f54->family); 659 660 f54->is_busy = false; 661 662 return 0; 663 } 664 665 static int rmi_f54_probe(struct rmi_function *fn) 666 { 667 struct f54_data *f54; 668 int ret; 669 u8 rx, tx; 670 671 f54 = devm_kzalloc(&fn->dev, sizeof(struct f54_data), GFP_KERNEL); 672 if (!f54) 673 return -ENOMEM; 674 675 f54->fn = fn; 676 dev_set_drvdata(&fn->dev, f54); 677 678 ret = rmi_f54_detect(fn); 679 if (ret) 680 return ret; 681 682 mutex_init(&f54->data_mutex); 683 mutex_init(&f54->status_mutex); 684 685 rx = f54->num_rx_electrodes; 686 tx = f54->num_tx_electrodes; 687 f54->report_data = devm_kzalloc(&fn->dev, 688 sizeof(u16) * tx * rx, 689 GFP_KERNEL); 690 if (f54->report_data == NULL) 691 return -ENOMEM; 692 693 INIT_DELAYED_WORK(&f54->work, rmi_f54_work); 694 695 f54->workqueue = create_singlethread_workqueue("rmi4-poller"); 696 if (!f54->workqueue) 697 return -ENOMEM; 698 699 rmi_f54_create_input_map(f54); 700 701 /* register video device */ 702 strlcpy(f54->v4l2.name, F54_NAME, sizeof(f54->v4l2.name)); 703 ret = v4l2_device_register(&fn->dev, &f54->v4l2); 704 if (ret) { 705 dev_err(&fn->dev, "Unable to register video dev.\n"); 706 goto remove_wq; 707 } 708 709 /* initialize the queue */ 710 mutex_init(&f54->lock); 711 f54->queue = rmi_f54_queue; 712 f54->queue.drv_priv = f54; 713 f54->queue.lock = &f54->lock; 714 f54->queue.dev = &fn->dev; 715 716 ret = vb2_queue_init(&f54->queue); 717 if (ret) 718 goto remove_v4l2; 719 720 f54->vdev = rmi_f54_video_device; 721 f54->vdev.v4l2_dev = &f54->v4l2; 722 f54->vdev.lock = &f54->lock; 723 f54->vdev.vfl_dir = VFL_DIR_RX; 724 f54->vdev.queue = &f54->queue; 725 video_set_drvdata(&f54->vdev, f54); 726 727 ret = video_register_device(&f54->vdev, VFL_TYPE_TOUCH, -1); 728 if (ret) { 729 dev_err(&fn->dev, "Unable to register video subdevice."); 730 goto remove_v4l2; 731 } 732 733 return 0; 734 735 remove_v4l2: 736 v4l2_device_unregister(&f54->v4l2); 737 remove_wq: 738 cancel_delayed_work_sync(&f54->work); 739 flush_workqueue(f54->workqueue); 740 destroy_workqueue(f54->workqueue); 741 return ret; 742 } 743 744 static void rmi_f54_remove(struct rmi_function *fn) 745 { 746 struct f54_data *f54 = dev_get_drvdata(&fn->dev); 747 748 video_unregister_device(&f54->vdev); 749 v4l2_device_unregister(&f54->v4l2); 750 } 751 752 struct rmi_function_handler rmi_f54_handler = { 753 .driver = { 754 .name = F54_NAME, 755 }, 756 .func = 0x54, 757 .probe = rmi_f54_probe, 758 .config = rmi_f54_config, 759 .attention = rmi_f54_attention, 760 .remove = rmi_f54_remove, 761 }; 762