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 /* 28 * The smbus protocol can read only 32 bytes max at a time. 29 * But this should be fine for i2c/spi as well. 30 */ 31 #define F54_REPORT_DATA_SIZE 32 32 33 /* F54 commands */ 34 #define F54_GET_REPORT 1 35 #define F54_FORCE_CAL 2 36 37 /* F54 capabilities */ 38 #define F54_CAP_BASELINE (1 << 2) 39 #define F54_CAP_IMAGE8 (1 << 3) 40 #define F54_CAP_IMAGE16 (1 << 6) 41 42 /** 43 * enum rmi_f54_report_type - RMI4 F54 report types 44 * 45 * @F54_REPORT_NONE: No Image Report. 46 * 47 * @F54_8BIT_IMAGE: Normalized 8-Bit Image Report. The capacitance variance 48 * from baseline for each pixel. 49 * 50 * @F54_16BIT_IMAGE: Normalized 16-Bit Image Report. The capacitance variance 51 * from baseline for each pixel. 52 * 53 * @F54_RAW_16BIT_IMAGE: 54 * Raw 16-Bit Image Report. The raw capacitance for each 55 * pixel. 56 * 57 * @F54_TRUE_BASELINE: True Baseline Report. The baseline capacitance for each 58 * pixel. 59 * 60 * @F54_FULL_RAW_CAP: Full Raw Capacitance Report. The raw capacitance with 61 * low reference set to its minimum value and high 62 * reference set to its maximum value. 63 * 64 * @F54_FULL_RAW_CAP_RX_OFFSET_REMOVED: 65 * Full Raw Capacitance with Receiver Offset Removed 66 * Report. Set Low reference to its minimum value and high 67 * references to its maximum value, then report the raw 68 * capacitance for each pixel. 69 * 70 * @F54_MAX_REPORT_TYPE: 71 * Maximum number of Report Types. Used for sanity 72 * checking. 73 */ 74 enum rmi_f54_report_type { 75 F54_REPORT_NONE = 0, 76 F54_8BIT_IMAGE = 1, 77 F54_16BIT_IMAGE = 2, 78 F54_RAW_16BIT_IMAGE = 3, 79 F54_TRUE_BASELINE = 9, 80 F54_FULL_RAW_CAP = 19, 81 F54_FULL_RAW_CAP_RX_OFFSET_REMOVED = 20, 82 F54_MAX_REPORT_TYPE, 83 }; 84 85 static const char * const rmi_f54_report_type_names[] = { 86 [F54_REPORT_NONE] = "Unknown", 87 [F54_8BIT_IMAGE] = "Normalized 8-Bit Image", 88 [F54_16BIT_IMAGE] = "Normalized 16-Bit Image", 89 [F54_RAW_16BIT_IMAGE] = "Raw 16-Bit Image", 90 [F54_TRUE_BASELINE] = "True Baseline", 91 [F54_FULL_RAW_CAP] = "Full Raw Capacitance", 92 [F54_FULL_RAW_CAP_RX_OFFSET_REMOVED] 93 = "Full Raw Capacitance RX Offset Removed", 94 }; 95 96 struct f54_data { 97 struct rmi_function *fn; 98 99 u8 num_rx_electrodes; 100 u8 num_tx_electrodes; 101 u8 capabilities; 102 u16 clock_rate; 103 u8 family; 104 105 enum rmi_f54_report_type report_type; 106 u8 *report_data; 107 int report_size; 108 109 bool is_busy; 110 struct mutex status_mutex; 111 struct mutex data_mutex; 112 113 struct workqueue_struct *workqueue; 114 struct delayed_work work; 115 unsigned long timeout; 116 117 struct completion cmd_done; 118 119 /* V4L2 support */ 120 struct v4l2_device v4l2; 121 struct v4l2_pix_format format; 122 struct video_device vdev; 123 struct vb2_queue queue; 124 struct mutex lock; 125 u32 sequence; 126 int input; 127 enum rmi_f54_report_type inputs[F54_MAX_REPORT_TYPE]; 128 }; 129 130 /* 131 * Basic checks on report_type to ensure we write a valid type 132 * to the sensor. 133 */ 134 static bool is_f54_report_type_valid(struct f54_data *f54, 135 enum rmi_f54_report_type reptype) 136 { 137 switch (reptype) { 138 case F54_8BIT_IMAGE: 139 return f54->capabilities & F54_CAP_IMAGE8; 140 case F54_16BIT_IMAGE: 141 case F54_RAW_16BIT_IMAGE: 142 return f54->capabilities & F54_CAP_IMAGE16; 143 case F54_TRUE_BASELINE: 144 return f54->capabilities & F54_CAP_IMAGE16; 145 case F54_FULL_RAW_CAP: 146 case F54_FULL_RAW_CAP_RX_OFFSET_REMOVED: 147 return true; 148 default: 149 return false; 150 } 151 } 152 153 static enum rmi_f54_report_type rmi_f54_get_reptype(struct f54_data *f54, 154 unsigned int i) 155 { 156 if (i >= F54_MAX_REPORT_TYPE) 157 return F54_REPORT_NONE; 158 159 return f54->inputs[i]; 160 } 161 162 static void rmi_f54_create_input_map(struct f54_data *f54) 163 { 164 int i = 0; 165 enum rmi_f54_report_type reptype; 166 167 for (reptype = 1; reptype < F54_MAX_REPORT_TYPE; reptype++) { 168 if (!is_f54_report_type_valid(f54, reptype)) 169 continue; 170 171 f54->inputs[i++] = reptype; 172 } 173 174 /* Remaining values are zero via kzalloc */ 175 } 176 177 static int rmi_f54_request_report(struct rmi_function *fn, u8 report_type) 178 { 179 struct f54_data *f54 = dev_get_drvdata(&fn->dev); 180 struct rmi_device *rmi_dev = fn->rmi_dev; 181 int error; 182 183 /* Write Report Type into F54_AD_Data0 */ 184 if (f54->report_type != report_type) { 185 error = rmi_write(rmi_dev, f54->fn->fd.data_base_addr, 186 report_type); 187 if (error) 188 return error; 189 f54->report_type = report_type; 190 } 191 192 /* 193 * Small delay after disabling interrupts to avoid race condition 194 * in firmare. This value is a bit higher than absolutely necessary. 195 * Should be removed once issue is resolved in firmware. 196 */ 197 usleep_range(2000, 3000); 198 199 mutex_lock(&f54->data_mutex); 200 201 error = rmi_write(rmi_dev, fn->fd.command_base_addr, F54_GET_REPORT); 202 if (error < 0) 203 goto unlock; 204 205 init_completion(&f54->cmd_done); 206 207 f54->is_busy = 1; 208 f54->timeout = jiffies + msecs_to_jiffies(100); 209 210 queue_delayed_work(f54->workqueue, &f54->work, 0); 211 212 unlock: 213 mutex_unlock(&f54->data_mutex); 214 215 return error; 216 } 217 218 static size_t rmi_f54_get_report_size(struct f54_data *f54) 219 { 220 struct rmi_device *rmi_dev = f54->fn->rmi_dev; 221 struct rmi_driver_data *drv_data = dev_get_drvdata(&rmi_dev->dev); 222 u8 rx = drv_data->num_rx_electrodes ? : f54->num_rx_electrodes; 223 u8 tx = drv_data->num_tx_electrodes ? : f54->num_tx_electrodes; 224 size_t size; 225 226 switch (rmi_f54_get_reptype(f54, f54->input)) { 227 case F54_8BIT_IMAGE: 228 size = rx * tx; 229 break; 230 case F54_16BIT_IMAGE: 231 case F54_RAW_16BIT_IMAGE: 232 case F54_TRUE_BASELINE: 233 case F54_FULL_RAW_CAP: 234 case F54_FULL_RAW_CAP_RX_OFFSET_REMOVED: 235 size = sizeof(u16) * rx * tx; 236 break; 237 default: 238 size = 0; 239 } 240 241 return size; 242 } 243 244 static int rmi_f54_get_pixel_fmt(enum rmi_f54_report_type reptype, u32 *pixfmt) 245 { 246 int ret = 0; 247 248 switch (reptype) { 249 case F54_8BIT_IMAGE: 250 *pixfmt = V4L2_TCH_FMT_DELTA_TD08; 251 break; 252 253 case F54_16BIT_IMAGE: 254 *pixfmt = V4L2_TCH_FMT_DELTA_TD16; 255 break; 256 257 case F54_RAW_16BIT_IMAGE: 258 case F54_TRUE_BASELINE: 259 case F54_FULL_RAW_CAP: 260 case F54_FULL_RAW_CAP_RX_OFFSET_REMOVED: 261 *pixfmt = V4L2_TCH_FMT_TU16; 262 break; 263 264 case F54_REPORT_NONE: 265 case F54_MAX_REPORT_TYPE: 266 ret = -EINVAL; 267 break; 268 } 269 270 return ret; 271 } 272 273 static const struct v4l2_file_operations rmi_f54_video_fops = { 274 .owner = THIS_MODULE, 275 .open = v4l2_fh_open, 276 .release = vb2_fop_release, 277 .unlocked_ioctl = video_ioctl2, 278 .read = vb2_fop_read, 279 .mmap = vb2_fop_mmap, 280 .poll = vb2_fop_poll, 281 }; 282 283 static int rmi_f54_queue_setup(struct vb2_queue *q, unsigned int *nbuffers, 284 unsigned int *nplanes, unsigned int sizes[], 285 struct device *alloc_devs[]) 286 { 287 struct f54_data *f54 = q->drv_priv; 288 289 if (*nplanes) 290 return sizes[0] < rmi_f54_get_report_size(f54) ? -EINVAL : 0; 291 292 *nplanes = 1; 293 sizes[0] = rmi_f54_get_report_size(f54); 294 295 return 0; 296 } 297 298 static void rmi_f54_buffer_queue(struct vb2_buffer *vb) 299 { 300 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 301 struct f54_data *f54 = vb2_get_drv_priv(vb->vb2_queue); 302 u16 *ptr; 303 enum vb2_buffer_state state; 304 enum rmi_f54_report_type reptype; 305 int ret; 306 307 mutex_lock(&f54->status_mutex); 308 309 vb2_set_plane_payload(vb, 0, 0); 310 reptype = rmi_f54_get_reptype(f54, f54->input); 311 if (reptype == F54_REPORT_NONE) { 312 state = VB2_BUF_STATE_ERROR; 313 goto done; 314 } 315 316 if (f54->is_busy) { 317 state = VB2_BUF_STATE_ERROR; 318 goto done; 319 } 320 321 ret = rmi_f54_request_report(f54->fn, reptype); 322 if (ret) { 323 dev_err(&f54->fn->dev, "Error requesting F54 report\n"); 324 state = VB2_BUF_STATE_ERROR; 325 goto done; 326 } 327 328 /* get frame data */ 329 mutex_lock(&f54->data_mutex); 330 331 while (f54->is_busy) { 332 mutex_unlock(&f54->data_mutex); 333 if (!wait_for_completion_timeout(&f54->cmd_done, 334 msecs_to_jiffies(1000))) { 335 dev_err(&f54->fn->dev, "Timed out\n"); 336 state = VB2_BUF_STATE_ERROR; 337 goto done; 338 } 339 mutex_lock(&f54->data_mutex); 340 } 341 342 ptr = vb2_plane_vaddr(vb, 0); 343 if (!ptr) { 344 dev_err(&f54->fn->dev, "Error acquiring frame ptr\n"); 345 state = VB2_BUF_STATE_ERROR; 346 goto data_done; 347 } 348 349 memcpy(ptr, f54->report_data, f54->report_size); 350 vb2_set_plane_payload(vb, 0, rmi_f54_get_report_size(f54)); 351 state = VB2_BUF_STATE_DONE; 352 353 data_done: 354 mutex_unlock(&f54->data_mutex); 355 done: 356 vb->timestamp = ktime_get_ns(); 357 vbuf->field = V4L2_FIELD_NONE; 358 vbuf->sequence = f54->sequence++; 359 vb2_buffer_done(vb, state); 360 mutex_unlock(&f54->status_mutex); 361 } 362 363 static void rmi_f54_stop_streaming(struct vb2_queue *q) 364 { 365 struct f54_data *f54 = vb2_get_drv_priv(q); 366 367 f54->sequence = 0; 368 } 369 370 /* V4L2 structures */ 371 static const struct vb2_ops rmi_f54_queue_ops = { 372 .queue_setup = rmi_f54_queue_setup, 373 .buf_queue = rmi_f54_buffer_queue, 374 .stop_streaming = rmi_f54_stop_streaming, 375 }; 376 377 static const struct vb2_queue rmi_f54_queue = { 378 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE, 379 .io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF | VB2_READ, 380 .buf_struct_size = sizeof(struct vb2_v4l2_buffer), 381 .ops = &rmi_f54_queue_ops, 382 .mem_ops = &vb2_vmalloc_memops, 383 .timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC, 384 }; 385 386 static int rmi_f54_vidioc_querycap(struct file *file, void *priv, 387 struct v4l2_capability *cap) 388 { 389 struct f54_data *f54 = video_drvdata(file); 390 391 strscpy(cap->driver, F54_NAME, sizeof(cap->driver)); 392 strscpy(cap->card, SYNAPTICS_INPUT_DEVICE_NAME, sizeof(cap->card)); 393 snprintf(cap->bus_info, sizeof(cap->bus_info), 394 "rmi4:%s", dev_name(&f54->fn->dev)); 395 396 return 0; 397 } 398 399 static int rmi_f54_vidioc_enum_input(struct file *file, void *priv, 400 struct v4l2_input *i) 401 { 402 struct f54_data *f54 = video_drvdata(file); 403 enum rmi_f54_report_type reptype; 404 405 reptype = rmi_f54_get_reptype(f54, i->index); 406 if (reptype == F54_REPORT_NONE) 407 return -EINVAL; 408 409 i->type = V4L2_INPUT_TYPE_TOUCH; 410 411 strscpy(i->name, rmi_f54_report_type_names[reptype], sizeof(i->name)); 412 return 0; 413 } 414 415 static int rmi_f54_set_input(struct f54_data *f54, unsigned int i) 416 { 417 struct rmi_device *rmi_dev = f54->fn->rmi_dev; 418 struct rmi_driver_data *drv_data = dev_get_drvdata(&rmi_dev->dev); 419 u8 rx = drv_data->num_rx_electrodes ? : f54->num_rx_electrodes; 420 u8 tx = drv_data->num_tx_electrodes ? : f54->num_tx_electrodes; 421 struct v4l2_pix_format *f = &f54->format; 422 enum rmi_f54_report_type reptype; 423 int ret; 424 425 reptype = rmi_f54_get_reptype(f54, i); 426 if (reptype == F54_REPORT_NONE) 427 return -EINVAL; 428 429 ret = rmi_f54_get_pixel_fmt(reptype, &f->pixelformat); 430 if (ret) 431 return ret; 432 433 f54->input = i; 434 435 f->width = rx; 436 f->height = tx; 437 f->field = V4L2_FIELD_NONE; 438 f->colorspace = V4L2_COLORSPACE_RAW; 439 f->bytesperline = f->width * sizeof(u16); 440 f->sizeimage = f->width * f->height * sizeof(u16); 441 442 return 0; 443 } 444 445 static int rmi_f54_vidioc_s_input(struct file *file, void *priv, unsigned int i) 446 { 447 return rmi_f54_set_input(video_drvdata(file), i); 448 } 449 450 static int rmi_f54_vidioc_g_input(struct file *file, void *priv, 451 unsigned int *i) 452 { 453 struct f54_data *f54 = video_drvdata(file); 454 455 *i = f54->input; 456 457 return 0; 458 } 459 460 static int rmi_f54_vidioc_fmt(struct file *file, void *priv, 461 struct v4l2_format *f) 462 { 463 struct f54_data *f54 = video_drvdata(file); 464 465 f->fmt.pix = f54->format; 466 467 return 0; 468 } 469 470 static int rmi_f54_vidioc_enum_fmt(struct file *file, void *priv, 471 struct v4l2_fmtdesc *fmt) 472 { 473 struct f54_data *f54 = video_drvdata(file); 474 475 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 476 return -EINVAL; 477 478 if (fmt->index) 479 return -EINVAL; 480 481 fmt->pixelformat = f54->format.pixelformat; 482 483 return 0; 484 } 485 486 static int rmi_f54_vidioc_g_parm(struct file *file, void *fh, 487 struct v4l2_streamparm *a) 488 { 489 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 490 return -EINVAL; 491 492 a->parm.capture.readbuffers = 1; 493 a->parm.capture.timeperframe.numerator = 1; 494 a->parm.capture.timeperframe.denominator = 10; 495 return 0; 496 } 497 498 static const struct v4l2_ioctl_ops rmi_f54_video_ioctl_ops = { 499 .vidioc_querycap = rmi_f54_vidioc_querycap, 500 501 .vidioc_enum_fmt_vid_cap = rmi_f54_vidioc_enum_fmt, 502 .vidioc_s_fmt_vid_cap = rmi_f54_vidioc_fmt, 503 .vidioc_g_fmt_vid_cap = rmi_f54_vidioc_fmt, 504 .vidioc_try_fmt_vid_cap = rmi_f54_vidioc_fmt, 505 .vidioc_g_parm = rmi_f54_vidioc_g_parm, 506 507 .vidioc_enum_input = rmi_f54_vidioc_enum_input, 508 .vidioc_g_input = rmi_f54_vidioc_g_input, 509 .vidioc_s_input = rmi_f54_vidioc_s_input, 510 511 .vidioc_reqbufs = vb2_ioctl_reqbufs, 512 .vidioc_create_bufs = vb2_ioctl_create_bufs, 513 .vidioc_querybuf = vb2_ioctl_querybuf, 514 .vidioc_qbuf = vb2_ioctl_qbuf, 515 .vidioc_dqbuf = vb2_ioctl_dqbuf, 516 .vidioc_expbuf = vb2_ioctl_expbuf, 517 518 .vidioc_streamon = vb2_ioctl_streamon, 519 .vidioc_streamoff = vb2_ioctl_streamoff, 520 }; 521 522 static const struct video_device rmi_f54_video_device = { 523 .name = "Synaptics RMI4", 524 .fops = &rmi_f54_video_fops, 525 .ioctl_ops = &rmi_f54_video_ioctl_ops, 526 .release = video_device_release_empty, 527 .device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TOUCH | 528 V4L2_CAP_READWRITE | V4L2_CAP_STREAMING, 529 }; 530 531 static void rmi_f54_work(struct work_struct *work) 532 { 533 struct f54_data *f54 = container_of(work, struct f54_data, work.work); 534 struct rmi_function *fn = f54->fn; 535 u8 fifo[2]; 536 int report_size; 537 u8 command; 538 int error; 539 int i; 540 541 report_size = rmi_f54_get_report_size(f54); 542 if (report_size == 0) { 543 dev_err(&fn->dev, "Bad report size, report type=%d\n", 544 f54->report_type); 545 error = -EINVAL; 546 goto error; /* retry won't help */ 547 } 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 for (i = 0; i < report_size; i += F54_REPORT_DATA_SIZE) { 573 int size = min(F54_REPORT_DATA_SIZE, report_size - i); 574 575 fifo[0] = i & 0xff; 576 fifo[1] = i >> 8; 577 error = rmi_write_block(fn->rmi_dev, 578 fn->fd.data_base_addr + F54_FIFO_OFFSET, 579 fifo, sizeof(fifo)); 580 if (error) { 581 dev_err(&fn->dev, "Failed to set fifo start offset\n"); 582 goto abort; 583 } 584 585 error = rmi_read_block(fn->rmi_dev, fn->fd.data_base_addr + 586 F54_REPORT_DATA_OFFSET, 587 f54->report_data + i, size); 588 if (error) { 589 dev_err(&fn->dev, "%s: read [%d bytes] returned %d\n", 590 __func__, size, error); 591 goto abort; 592 } 593 } 594 595 abort: 596 f54->report_size = error ? 0 : report_size; 597 error: 598 if (error) 599 report_size = 0; 600 601 if (report_size == 0 && !error) { 602 queue_delayed_work(f54->workqueue, &f54->work, 603 msecs_to_jiffies(1)); 604 } else { 605 f54->is_busy = false; 606 complete(&f54->cmd_done); 607 } 608 609 mutex_unlock(&f54->data_mutex); 610 } 611 612 static int rmi_f54_config(struct rmi_function *fn) 613 { 614 struct rmi_driver *drv = fn->rmi_dev->driver; 615 616 drv->clear_irq_bits(fn->rmi_dev, fn->irq_mask); 617 618 return 0; 619 } 620 621 static int rmi_f54_detect(struct rmi_function *fn) 622 { 623 int error; 624 struct f54_data *f54; 625 u8 buf[6]; 626 627 f54 = dev_get_drvdata(&fn->dev); 628 629 error = rmi_read_block(fn->rmi_dev, fn->fd.query_base_addr, 630 buf, sizeof(buf)); 631 if (error) { 632 dev_err(&fn->dev, "%s: Failed to query F54 properties\n", 633 __func__); 634 return error; 635 } 636 637 f54->num_rx_electrodes = buf[0]; 638 f54->num_tx_electrodes = buf[1]; 639 f54->capabilities = buf[2]; 640 f54->clock_rate = buf[3] | (buf[4] << 8); 641 f54->family = buf[5]; 642 643 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 num_rx_electrodes: %d\n", 644 f54->num_rx_electrodes); 645 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 num_tx_electrodes: %d\n", 646 f54->num_tx_electrodes); 647 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 capabilities: 0x%x\n", 648 f54->capabilities); 649 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 clock rate: 0x%x\n", 650 f54->clock_rate); 651 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 family: 0x%x\n", 652 f54->family); 653 654 f54->is_busy = false; 655 656 return 0; 657 } 658 659 static int rmi_f54_probe(struct rmi_function *fn) 660 { 661 struct f54_data *f54; 662 int ret; 663 u8 rx, tx; 664 665 f54 = devm_kzalloc(&fn->dev, sizeof(struct f54_data), GFP_KERNEL); 666 if (!f54) 667 return -ENOMEM; 668 669 f54->fn = fn; 670 dev_set_drvdata(&fn->dev, f54); 671 672 ret = rmi_f54_detect(fn); 673 if (ret) 674 return ret; 675 676 mutex_init(&f54->data_mutex); 677 mutex_init(&f54->status_mutex); 678 679 rx = f54->num_rx_electrodes; 680 tx = f54->num_tx_electrodes; 681 f54->report_data = devm_kzalloc(&fn->dev, 682 array3_size(tx, rx, sizeof(u16)), 683 GFP_KERNEL); 684 if (f54->report_data == NULL) 685 return -ENOMEM; 686 687 INIT_DELAYED_WORK(&f54->work, rmi_f54_work); 688 689 f54->workqueue = create_singlethread_workqueue("rmi4-poller"); 690 if (!f54->workqueue) 691 return -ENOMEM; 692 693 rmi_f54_create_input_map(f54); 694 rmi_f54_set_input(f54, 0); 695 696 /* register video device */ 697 strscpy(f54->v4l2.name, F54_NAME, sizeof(f54->v4l2.name)); 698 ret = v4l2_device_register(&fn->dev, &f54->v4l2); 699 if (ret) { 700 dev_err(&fn->dev, "Unable to register video dev.\n"); 701 goto remove_wq; 702 } 703 704 /* initialize the queue */ 705 mutex_init(&f54->lock); 706 f54->queue = rmi_f54_queue; 707 f54->queue.drv_priv = f54; 708 f54->queue.lock = &f54->lock; 709 f54->queue.dev = &fn->dev; 710 711 ret = vb2_queue_init(&f54->queue); 712 if (ret) 713 goto remove_v4l2; 714 715 f54->vdev = rmi_f54_video_device; 716 f54->vdev.v4l2_dev = &f54->v4l2; 717 f54->vdev.lock = &f54->lock; 718 f54->vdev.vfl_dir = VFL_DIR_RX; 719 f54->vdev.queue = &f54->queue; 720 video_set_drvdata(&f54->vdev, f54); 721 722 ret = video_register_device(&f54->vdev, VFL_TYPE_TOUCH, -1); 723 if (ret) { 724 dev_err(&fn->dev, "Unable to register video subdevice."); 725 goto remove_v4l2; 726 } 727 728 return 0; 729 730 remove_v4l2: 731 v4l2_device_unregister(&f54->v4l2); 732 remove_wq: 733 cancel_delayed_work_sync(&f54->work); 734 destroy_workqueue(f54->workqueue); 735 return ret; 736 } 737 738 static void rmi_f54_remove(struct rmi_function *fn) 739 { 740 struct f54_data *f54 = dev_get_drvdata(&fn->dev); 741 742 video_unregister_device(&f54->vdev); 743 v4l2_device_unregister(&f54->v4l2); 744 destroy_workqueue(f54->workqueue); 745 } 746 747 struct rmi_function_handler rmi_f54_handler = { 748 .driver = { 749 .name = F54_NAME, 750 }, 751 .func = 0x54, 752 .probe = rmi_f54_probe, 753 .config = rmi_f54_config, 754 .remove = rmi_f54_remove, 755 }; 756