1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2012-2015 Synaptics Incorporated 4 * Copyright (C) 2016 Zodiac Inflight Innovations 5 */ 6 7 #include <linux/kernel.h> 8 #include <linux/rmi.h> 9 #include <linux/input.h> 10 #include <linux/slab.h> 11 #include <linux/delay.h> 12 #include <linux/i2c.h> 13 #include <media/v4l2-device.h> 14 #include <media/v4l2-ioctl.h> 15 #include <media/videobuf2-v4l2.h> 16 #include <media/videobuf2-vmalloc.h> 17 #include "rmi_driver.h" 18 19 #define F54_NAME "rmi4_f54" 20 21 /* F54 data offsets */ 22 #define F54_REPORT_DATA_OFFSET 3 23 #define F54_FIFO_OFFSET 1 24 #define F54_NUM_TX_OFFSET 1 25 #define F54_NUM_RX_OFFSET 0 26 27 /* F54 commands */ 28 #define F54_GET_REPORT 1 29 #define F54_FORCE_CAL 2 30 31 /* F54 capabilities */ 32 #define F54_CAP_BASELINE (1 << 2) 33 #define F54_CAP_IMAGE8 (1 << 3) 34 #define F54_CAP_IMAGE16 (1 << 6) 35 36 /** 37 * enum rmi_f54_report_type - RMI4 F54 report types 38 * 39 * @F54_8BIT_IMAGE: Normalized 8-Bit Image Report. The capacitance variance 40 * from baseline for each pixel. 41 * 42 * @F54_16BIT_IMAGE: Normalized 16-Bit Image Report. The capacitance variance 43 * from baseline for each pixel. 44 * 45 * @F54_RAW_16BIT_IMAGE: 46 * Raw 16-Bit Image Report. The raw capacitance for each 47 * pixel. 48 * 49 * @F54_TRUE_BASELINE: True Baseline Report. The baseline capacitance for each 50 * pixel. 51 * 52 * @F54_FULL_RAW_CAP: Full Raw Capacitance Report. The raw capacitance with 53 * low reference set to its minimum value and high 54 * reference set to its maximum value. 55 * 56 * @F54_FULL_RAW_CAP_RX_OFFSET_REMOVED: 57 * Full Raw Capacitance with Receiver Offset Removed 58 * Report. Set Low reference to its minimum value and high 59 * references to its maximum value, then report the raw 60 * capacitance for each pixel. 61 */ 62 enum rmi_f54_report_type { 63 F54_REPORT_NONE = 0, 64 F54_8BIT_IMAGE = 1, 65 F54_16BIT_IMAGE = 2, 66 F54_RAW_16BIT_IMAGE = 3, 67 F54_TRUE_BASELINE = 9, 68 F54_FULL_RAW_CAP = 19, 69 F54_FULL_RAW_CAP_RX_OFFSET_REMOVED = 20, 70 F54_MAX_REPORT_TYPE, 71 }; 72 73 static const char * const rmi_f54_report_type_names[] = { 74 [F54_REPORT_NONE] = "Unknown", 75 [F54_8BIT_IMAGE] = "Normalized 8-Bit Image", 76 [F54_16BIT_IMAGE] = "Normalized 16-Bit Image", 77 [F54_RAW_16BIT_IMAGE] = "Raw 16-Bit Image", 78 [F54_TRUE_BASELINE] = "True Baseline", 79 [F54_FULL_RAW_CAP] = "Full Raw Capacitance", 80 [F54_FULL_RAW_CAP_RX_OFFSET_REMOVED] 81 = "Full Raw Capacitance RX Offset Removed", 82 }; 83 84 struct f54_data { 85 struct rmi_function *fn; 86 87 u8 num_rx_electrodes; 88 u8 num_tx_electrodes; 89 u8 capabilities; 90 u16 clock_rate; 91 u8 family; 92 93 enum rmi_f54_report_type report_type; 94 u8 *report_data; 95 int report_size; 96 97 bool is_busy; 98 struct mutex status_mutex; 99 struct mutex data_mutex; 100 101 struct workqueue_struct *workqueue; 102 struct delayed_work work; 103 unsigned long timeout; 104 105 struct completion cmd_done; 106 107 /* V4L2 support */ 108 struct v4l2_device v4l2; 109 struct v4l2_pix_format format; 110 struct video_device vdev; 111 struct vb2_queue queue; 112 struct mutex lock; 113 u32 sequence; 114 int input; 115 enum rmi_f54_report_type inputs[F54_MAX_REPORT_TYPE]; 116 }; 117 118 /* 119 * Basic checks on report_type to ensure we write a valid type 120 * to the sensor. 121 */ 122 static bool is_f54_report_type_valid(struct f54_data *f54, 123 enum rmi_f54_report_type reptype) 124 { 125 switch (reptype) { 126 case F54_8BIT_IMAGE: 127 return f54->capabilities & F54_CAP_IMAGE8; 128 case F54_16BIT_IMAGE: 129 case F54_RAW_16BIT_IMAGE: 130 return f54->capabilities & F54_CAP_IMAGE16; 131 case F54_TRUE_BASELINE: 132 return f54->capabilities & F54_CAP_IMAGE16; 133 case F54_FULL_RAW_CAP: 134 case F54_FULL_RAW_CAP_RX_OFFSET_REMOVED: 135 return true; 136 default: 137 return false; 138 } 139 } 140 141 static enum rmi_f54_report_type rmi_f54_get_reptype(struct f54_data *f54, 142 unsigned int i) 143 { 144 if (i >= F54_MAX_REPORT_TYPE) 145 return F54_REPORT_NONE; 146 147 return f54->inputs[i]; 148 } 149 150 static void rmi_f54_create_input_map(struct f54_data *f54) 151 { 152 int i = 0; 153 enum rmi_f54_report_type reptype; 154 155 for (reptype = 1; reptype < F54_MAX_REPORT_TYPE; reptype++) { 156 if (!is_f54_report_type_valid(f54, reptype)) 157 continue; 158 159 f54->inputs[i++] = reptype; 160 } 161 162 /* Remaining values are zero via kzalloc */ 163 } 164 165 static int rmi_f54_request_report(struct rmi_function *fn, u8 report_type) 166 { 167 struct f54_data *f54 = dev_get_drvdata(&fn->dev); 168 struct rmi_device *rmi_dev = fn->rmi_dev; 169 int error; 170 171 /* Write Report Type into F54_AD_Data0 */ 172 if (f54->report_type != report_type) { 173 error = rmi_write(rmi_dev, f54->fn->fd.data_base_addr, 174 report_type); 175 if (error) 176 return error; 177 f54->report_type = report_type; 178 } 179 180 /* 181 * Small delay after disabling interrupts to avoid race condition 182 * in firmare. This value is a bit higher than absolutely necessary. 183 * Should be removed once issue is resolved in firmware. 184 */ 185 usleep_range(2000, 3000); 186 187 mutex_lock(&f54->data_mutex); 188 189 error = rmi_write(rmi_dev, fn->fd.command_base_addr, F54_GET_REPORT); 190 if (error < 0) 191 goto unlock; 192 193 init_completion(&f54->cmd_done); 194 195 f54->is_busy = 1; 196 f54->timeout = jiffies + msecs_to_jiffies(100); 197 198 queue_delayed_work(f54->workqueue, &f54->work, 0); 199 200 unlock: 201 mutex_unlock(&f54->data_mutex); 202 203 return error; 204 } 205 206 static size_t rmi_f54_get_report_size(struct f54_data *f54) 207 { 208 struct rmi_device *rmi_dev = f54->fn->rmi_dev; 209 struct rmi_driver_data *drv_data = dev_get_drvdata(&rmi_dev->dev); 210 u8 rx = drv_data->num_rx_electrodes ? : f54->num_rx_electrodes; 211 u8 tx = drv_data->num_tx_electrodes ? : f54->num_tx_electrodes; 212 size_t size; 213 214 switch (rmi_f54_get_reptype(f54, f54->input)) { 215 case F54_8BIT_IMAGE: 216 size = rx * tx; 217 break; 218 case F54_16BIT_IMAGE: 219 case F54_RAW_16BIT_IMAGE: 220 case F54_TRUE_BASELINE: 221 case F54_FULL_RAW_CAP: 222 case F54_FULL_RAW_CAP_RX_OFFSET_REMOVED: 223 size = sizeof(u16) * rx * tx; 224 break; 225 default: 226 size = 0; 227 } 228 229 return size; 230 } 231 232 static int rmi_f54_get_pixel_fmt(enum rmi_f54_report_type reptype, u32 *pixfmt) 233 { 234 int ret = 0; 235 236 switch (reptype) { 237 case F54_8BIT_IMAGE: 238 *pixfmt = V4L2_TCH_FMT_DELTA_TD08; 239 break; 240 241 case F54_16BIT_IMAGE: 242 *pixfmt = V4L2_TCH_FMT_DELTA_TD16; 243 break; 244 245 case F54_RAW_16BIT_IMAGE: 246 case F54_TRUE_BASELINE: 247 case F54_FULL_RAW_CAP: 248 case F54_FULL_RAW_CAP_RX_OFFSET_REMOVED: 249 *pixfmt = V4L2_TCH_FMT_TU16; 250 break; 251 252 case F54_REPORT_NONE: 253 case F54_MAX_REPORT_TYPE: 254 ret = -EINVAL; 255 break; 256 } 257 258 return ret; 259 } 260 261 static const struct v4l2_file_operations rmi_f54_video_fops = { 262 .owner = THIS_MODULE, 263 .open = v4l2_fh_open, 264 .release = vb2_fop_release, 265 .unlocked_ioctl = video_ioctl2, 266 .read = vb2_fop_read, 267 .mmap = vb2_fop_mmap, 268 .poll = vb2_fop_poll, 269 }; 270 271 static int rmi_f54_queue_setup(struct vb2_queue *q, unsigned int *nbuffers, 272 unsigned int *nplanes, unsigned int sizes[], 273 struct device *alloc_devs[]) 274 { 275 struct f54_data *f54 = q->drv_priv; 276 277 if (*nplanes) 278 return sizes[0] < rmi_f54_get_report_size(f54) ? -EINVAL : 0; 279 280 *nplanes = 1; 281 sizes[0] = rmi_f54_get_report_size(f54); 282 283 return 0; 284 } 285 286 static void rmi_f54_buffer_queue(struct vb2_buffer *vb) 287 { 288 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 289 struct f54_data *f54 = vb2_get_drv_priv(vb->vb2_queue); 290 u16 *ptr; 291 enum vb2_buffer_state state; 292 enum rmi_f54_report_type reptype; 293 int ret; 294 295 mutex_lock(&f54->status_mutex); 296 297 vb2_set_plane_payload(vb, 0, 0); 298 reptype = rmi_f54_get_reptype(f54, f54->input); 299 if (reptype == F54_REPORT_NONE) { 300 state = VB2_BUF_STATE_ERROR; 301 goto done; 302 } 303 304 if (f54->is_busy) { 305 state = VB2_BUF_STATE_ERROR; 306 goto done; 307 } 308 309 ret = rmi_f54_request_report(f54->fn, reptype); 310 if (ret) { 311 dev_err(&f54->fn->dev, "Error requesting F54 report\n"); 312 state = VB2_BUF_STATE_ERROR; 313 goto done; 314 } 315 316 /* get frame data */ 317 mutex_lock(&f54->data_mutex); 318 319 while (f54->is_busy) { 320 mutex_unlock(&f54->data_mutex); 321 if (!wait_for_completion_timeout(&f54->cmd_done, 322 msecs_to_jiffies(1000))) { 323 dev_err(&f54->fn->dev, "Timed out\n"); 324 state = VB2_BUF_STATE_ERROR; 325 goto done; 326 } 327 mutex_lock(&f54->data_mutex); 328 } 329 330 ptr = vb2_plane_vaddr(vb, 0); 331 if (!ptr) { 332 dev_err(&f54->fn->dev, "Error acquiring frame ptr\n"); 333 state = VB2_BUF_STATE_ERROR; 334 goto data_done; 335 } 336 337 memcpy(ptr, f54->report_data, f54->report_size); 338 vb2_set_plane_payload(vb, 0, rmi_f54_get_report_size(f54)); 339 state = VB2_BUF_STATE_DONE; 340 341 data_done: 342 mutex_unlock(&f54->data_mutex); 343 done: 344 vb->timestamp = ktime_get_ns(); 345 vbuf->field = V4L2_FIELD_NONE; 346 vbuf->sequence = f54->sequence++; 347 vb2_buffer_done(vb, state); 348 mutex_unlock(&f54->status_mutex); 349 } 350 351 static void rmi_f54_stop_streaming(struct vb2_queue *q) 352 { 353 struct f54_data *f54 = vb2_get_drv_priv(q); 354 355 f54->sequence = 0; 356 } 357 358 /* V4L2 structures */ 359 static const struct vb2_ops rmi_f54_queue_ops = { 360 .queue_setup = rmi_f54_queue_setup, 361 .buf_queue = rmi_f54_buffer_queue, 362 .stop_streaming = rmi_f54_stop_streaming, 363 .wait_prepare = vb2_ops_wait_prepare, 364 .wait_finish = vb2_ops_wait_finish, 365 }; 366 367 static const struct vb2_queue rmi_f54_queue = { 368 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE, 369 .io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF | VB2_READ, 370 .buf_struct_size = sizeof(struct vb2_v4l2_buffer), 371 .ops = &rmi_f54_queue_ops, 372 .mem_ops = &vb2_vmalloc_memops, 373 .timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC, 374 }; 375 376 static int rmi_f54_vidioc_querycap(struct file *file, void *priv, 377 struct v4l2_capability *cap) 378 { 379 struct f54_data *f54 = video_drvdata(file); 380 381 strlcpy(cap->driver, F54_NAME, sizeof(cap->driver)); 382 strlcpy(cap->card, SYNAPTICS_INPUT_DEVICE_NAME, sizeof(cap->card)); 383 snprintf(cap->bus_info, sizeof(cap->bus_info), 384 "rmi4:%s", dev_name(&f54->fn->dev)); 385 386 return 0; 387 } 388 389 static int rmi_f54_vidioc_enum_input(struct file *file, void *priv, 390 struct v4l2_input *i) 391 { 392 struct f54_data *f54 = video_drvdata(file); 393 enum rmi_f54_report_type reptype; 394 395 reptype = rmi_f54_get_reptype(f54, i->index); 396 if (reptype == F54_REPORT_NONE) 397 return -EINVAL; 398 399 i->type = V4L2_INPUT_TYPE_TOUCH; 400 401 strlcpy(i->name, rmi_f54_report_type_names[reptype], sizeof(i->name)); 402 return 0; 403 } 404 405 static int rmi_f54_set_input(struct f54_data *f54, unsigned int i) 406 { 407 struct rmi_device *rmi_dev = f54->fn->rmi_dev; 408 struct rmi_driver_data *drv_data = dev_get_drvdata(&rmi_dev->dev); 409 u8 rx = drv_data->num_rx_electrodes ? : f54->num_rx_electrodes; 410 u8 tx = drv_data->num_tx_electrodes ? : f54->num_tx_electrodes; 411 struct v4l2_pix_format *f = &f54->format; 412 enum rmi_f54_report_type reptype; 413 int ret; 414 415 reptype = rmi_f54_get_reptype(f54, i); 416 if (reptype == F54_REPORT_NONE) 417 return -EINVAL; 418 419 ret = rmi_f54_get_pixel_fmt(reptype, &f->pixelformat); 420 if (ret) 421 return ret; 422 423 f54->input = i; 424 425 f->width = rx; 426 f->height = tx; 427 f->field = V4L2_FIELD_NONE; 428 f->colorspace = V4L2_COLORSPACE_RAW; 429 f->bytesperline = f->width * sizeof(u16); 430 f->sizeimage = f->width * f->height * sizeof(u16); 431 432 return 0; 433 } 434 435 static int rmi_f54_vidioc_s_input(struct file *file, void *priv, unsigned int i) 436 { 437 return rmi_f54_set_input(video_drvdata(file), i); 438 } 439 440 static int rmi_f54_vidioc_g_input(struct file *file, void *priv, 441 unsigned int *i) 442 { 443 struct f54_data *f54 = video_drvdata(file); 444 445 *i = f54->input; 446 447 return 0; 448 } 449 450 static int rmi_f54_vidioc_fmt(struct file *file, void *priv, 451 struct v4l2_format *f) 452 { 453 struct f54_data *f54 = video_drvdata(file); 454 455 f->fmt.pix = f54->format; 456 457 return 0; 458 } 459 460 static int rmi_f54_vidioc_enum_fmt(struct file *file, void *priv, 461 struct v4l2_fmtdesc *fmt) 462 { 463 struct f54_data *f54 = video_drvdata(file); 464 465 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 466 return -EINVAL; 467 468 if (fmt->index) 469 return -EINVAL; 470 471 fmt->pixelformat = f54->format.pixelformat; 472 473 return 0; 474 } 475 476 static int rmi_f54_vidioc_g_parm(struct file *file, void *fh, 477 struct v4l2_streamparm *a) 478 { 479 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 480 return -EINVAL; 481 482 a->parm.capture.readbuffers = 1; 483 a->parm.capture.timeperframe.numerator = 1; 484 a->parm.capture.timeperframe.denominator = 10; 485 return 0; 486 } 487 488 static const struct v4l2_ioctl_ops rmi_f54_video_ioctl_ops = { 489 .vidioc_querycap = rmi_f54_vidioc_querycap, 490 491 .vidioc_enum_fmt_vid_cap = rmi_f54_vidioc_enum_fmt, 492 .vidioc_s_fmt_vid_cap = rmi_f54_vidioc_fmt, 493 .vidioc_g_fmt_vid_cap = rmi_f54_vidioc_fmt, 494 .vidioc_try_fmt_vid_cap = rmi_f54_vidioc_fmt, 495 .vidioc_g_parm = rmi_f54_vidioc_g_parm, 496 497 .vidioc_enum_input = rmi_f54_vidioc_enum_input, 498 .vidioc_g_input = rmi_f54_vidioc_g_input, 499 .vidioc_s_input = rmi_f54_vidioc_s_input, 500 501 .vidioc_reqbufs = vb2_ioctl_reqbufs, 502 .vidioc_create_bufs = vb2_ioctl_create_bufs, 503 .vidioc_querybuf = vb2_ioctl_querybuf, 504 .vidioc_qbuf = vb2_ioctl_qbuf, 505 .vidioc_dqbuf = vb2_ioctl_dqbuf, 506 .vidioc_expbuf = vb2_ioctl_expbuf, 507 508 .vidioc_streamon = vb2_ioctl_streamon, 509 .vidioc_streamoff = vb2_ioctl_streamoff, 510 }; 511 512 static const struct video_device rmi_f54_video_device = { 513 .name = "Synaptics RMI4", 514 .fops = &rmi_f54_video_fops, 515 .ioctl_ops = &rmi_f54_video_ioctl_ops, 516 .release = video_device_release_empty, 517 .device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TOUCH | 518 V4L2_CAP_READWRITE | V4L2_CAP_STREAMING, 519 }; 520 521 static void rmi_f54_work(struct work_struct *work) 522 { 523 struct f54_data *f54 = container_of(work, struct f54_data, work.work); 524 struct rmi_function *fn = f54->fn; 525 u8 fifo[2]; 526 int report_size; 527 u8 command; 528 int error; 529 530 report_size = rmi_f54_get_report_size(f54); 531 if (report_size == 0) { 532 dev_err(&fn->dev, "Bad report size, report type=%d\n", 533 f54->report_type); 534 error = -EINVAL; 535 goto error; /* retry won't help */ 536 } 537 538 mutex_lock(&f54->data_mutex); 539 540 /* 541 * Need to check if command has completed. 542 * If not try again later. 543 */ 544 error = rmi_read(fn->rmi_dev, f54->fn->fd.command_base_addr, 545 &command); 546 if (error) { 547 dev_err(&fn->dev, "Failed to read back command\n"); 548 goto error; 549 } 550 if (command & F54_GET_REPORT) { 551 if (time_after(jiffies, f54->timeout)) { 552 dev_err(&fn->dev, "Get report command timed out\n"); 553 error = -ETIMEDOUT; 554 } 555 report_size = 0; 556 goto error; 557 } 558 559 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "Get report command completed, reading data\n"); 560 561 fifo[0] = 0; 562 fifo[1] = 0; 563 error = rmi_write_block(fn->rmi_dev, 564 fn->fd.data_base_addr + F54_FIFO_OFFSET, 565 fifo, sizeof(fifo)); 566 if (error) { 567 dev_err(&fn->dev, "Failed to set fifo start offset\n"); 568 goto abort; 569 } 570 571 error = rmi_read_block(fn->rmi_dev, fn->fd.data_base_addr + 572 F54_REPORT_DATA_OFFSET, f54->report_data, 573 report_size); 574 if (error) { 575 dev_err(&fn->dev, "%s: read [%d bytes] returned %d\n", 576 __func__, report_size, error); 577 goto abort; 578 } 579 580 abort: 581 f54->report_size = error ? 0 : report_size; 582 error: 583 if (error) 584 report_size = 0; 585 586 if (report_size == 0 && !error) { 587 queue_delayed_work(f54->workqueue, &f54->work, 588 msecs_to_jiffies(1)); 589 } else { 590 f54->is_busy = false; 591 complete(&f54->cmd_done); 592 } 593 594 mutex_unlock(&f54->data_mutex); 595 } 596 597 static int rmi_f54_config(struct rmi_function *fn) 598 { 599 struct rmi_driver *drv = fn->rmi_dev->driver; 600 601 drv->clear_irq_bits(fn->rmi_dev, fn->irq_mask); 602 603 return 0; 604 } 605 606 static int rmi_f54_detect(struct rmi_function *fn) 607 { 608 int error; 609 struct f54_data *f54; 610 u8 buf[6]; 611 612 f54 = dev_get_drvdata(&fn->dev); 613 614 error = rmi_read_block(fn->rmi_dev, fn->fd.query_base_addr, 615 buf, sizeof(buf)); 616 if (error) { 617 dev_err(&fn->dev, "%s: Failed to query F54 properties\n", 618 __func__); 619 return error; 620 } 621 622 f54->num_rx_electrodes = buf[0]; 623 f54->num_tx_electrodes = buf[1]; 624 f54->capabilities = buf[2]; 625 f54->clock_rate = buf[3] | (buf[4] << 8); 626 f54->family = buf[5]; 627 628 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 num_rx_electrodes: %d\n", 629 f54->num_rx_electrodes); 630 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 num_tx_electrodes: %d\n", 631 f54->num_tx_electrodes); 632 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 capabilities: 0x%x\n", 633 f54->capabilities); 634 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 clock rate: 0x%x\n", 635 f54->clock_rate); 636 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 family: 0x%x\n", 637 f54->family); 638 639 f54->is_busy = false; 640 641 return 0; 642 } 643 644 static int rmi_f54_probe(struct rmi_function *fn) 645 { 646 struct f54_data *f54; 647 int ret; 648 u8 rx, tx; 649 650 f54 = devm_kzalloc(&fn->dev, sizeof(struct f54_data), GFP_KERNEL); 651 if (!f54) 652 return -ENOMEM; 653 654 f54->fn = fn; 655 dev_set_drvdata(&fn->dev, f54); 656 657 ret = rmi_f54_detect(fn); 658 if (ret) 659 return ret; 660 661 mutex_init(&f54->data_mutex); 662 mutex_init(&f54->status_mutex); 663 664 rx = f54->num_rx_electrodes; 665 tx = f54->num_tx_electrodes; 666 f54->report_data = devm_kzalloc(&fn->dev, 667 array3_size(tx, rx, sizeof(u16)), 668 GFP_KERNEL); 669 if (f54->report_data == NULL) 670 return -ENOMEM; 671 672 INIT_DELAYED_WORK(&f54->work, rmi_f54_work); 673 674 f54->workqueue = create_singlethread_workqueue("rmi4-poller"); 675 if (!f54->workqueue) 676 return -ENOMEM; 677 678 rmi_f54_create_input_map(f54); 679 rmi_f54_set_input(f54, 0); 680 681 /* register video device */ 682 strlcpy(f54->v4l2.name, F54_NAME, sizeof(f54->v4l2.name)); 683 ret = v4l2_device_register(&fn->dev, &f54->v4l2); 684 if (ret) { 685 dev_err(&fn->dev, "Unable to register video dev.\n"); 686 goto remove_wq; 687 } 688 689 /* initialize the queue */ 690 mutex_init(&f54->lock); 691 f54->queue = rmi_f54_queue; 692 f54->queue.drv_priv = f54; 693 f54->queue.lock = &f54->lock; 694 f54->queue.dev = &fn->dev; 695 696 ret = vb2_queue_init(&f54->queue); 697 if (ret) 698 goto remove_v4l2; 699 700 f54->vdev = rmi_f54_video_device; 701 f54->vdev.v4l2_dev = &f54->v4l2; 702 f54->vdev.lock = &f54->lock; 703 f54->vdev.vfl_dir = VFL_DIR_RX; 704 f54->vdev.queue = &f54->queue; 705 video_set_drvdata(&f54->vdev, f54); 706 707 ret = video_register_device(&f54->vdev, VFL_TYPE_TOUCH, -1); 708 if (ret) { 709 dev_err(&fn->dev, "Unable to register video subdevice."); 710 goto remove_v4l2; 711 } 712 713 return 0; 714 715 remove_v4l2: 716 v4l2_device_unregister(&f54->v4l2); 717 remove_wq: 718 cancel_delayed_work_sync(&f54->work); 719 flush_workqueue(f54->workqueue); 720 destroy_workqueue(f54->workqueue); 721 return ret; 722 } 723 724 static void rmi_f54_remove(struct rmi_function *fn) 725 { 726 struct f54_data *f54 = dev_get_drvdata(&fn->dev); 727 728 video_unregister_device(&f54->vdev); 729 v4l2_device_unregister(&f54->v4l2); 730 destroy_workqueue(f54->workqueue); 731 } 732 733 struct rmi_function_handler rmi_f54_handler = { 734 .driver = { 735 .name = F54_NAME, 736 }, 737 .func = 0x54, 738 .probe = rmi_f54_probe, 739 .config = rmi_f54_config, 740 .remove = rmi_f54_remove, 741 }; 742