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 .wait_prepare = vb2_ops_wait_prepare, 376 .wait_finish = vb2_ops_wait_finish, 377 }; 378 379 static const struct vb2_queue rmi_f54_queue = { 380 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE, 381 .io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF | VB2_READ, 382 .buf_struct_size = sizeof(struct vb2_v4l2_buffer), 383 .ops = &rmi_f54_queue_ops, 384 .mem_ops = &vb2_vmalloc_memops, 385 .timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC, 386 }; 387 388 static int rmi_f54_vidioc_querycap(struct file *file, void *priv, 389 struct v4l2_capability *cap) 390 { 391 struct f54_data *f54 = video_drvdata(file); 392 393 strlcpy(cap->driver, F54_NAME, sizeof(cap->driver)); 394 strlcpy(cap->card, SYNAPTICS_INPUT_DEVICE_NAME, sizeof(cap->card)); 395 snprintf(cap->bus_info, sizeof(cap->bus_info), 396 "rmi4:%s", dev_name(&f54->fn->dev)); 397 398 return 0; 399 } 400 401 static int rmi_f54_vidioc_enum_input(struct file *file, void *priv, 402 struct v4l2_input *i) 403 { 404 struct f54_data *f54 = video_drvdata(file); 405 enum rmi_f54_report_type reptype; 406 407 reptype = rmi_f54_get_reptype(f54, i->index); 408 if (reptype == F54_REPORT_NONE) 409 return -EINVAL; 410 411 i->type = V4L2_INPUT_TYPE_TOUCH; 412 413 strlcpy(i->name, rmi_f54_report_type_names[reptype], sizeof(i->name)); 414 return 0; 415 } 416 417 static int rmi_f54_set_input(struct f54_data *f54, unsigned int i) 418 { 419 struct rmi_device *rmi_dev = f54->fn->rmi_dev; 420 struct rmi_driver_data *drv_data = dev_get_drvdata(&rmi_dev->dev); 421 u8 rx = drv_data->num_rx_electrodes ? : f54->num_rx_electrodes; 422 u8 tx = drv_data->num_tx_electrodes ? : f54->num_tx_electrodes; 423 struct v4l2_pix_format *f = &f54->format; 424 enum rmi_f54_report_type reptype; 425 int ret; 426 427 reptype = rmi_f54_get_reptype(f54, i); 428 if (reptype == F54_REPORT_NONE) 429 return -EINVAL; 430 431 ret = rmi_f54_get_pixel_fmt(reptype, &f->pixelformat); 432 if (ret) 433 return ret; 434 435 f54->input = i; 436 437 f->width = rx; 438 f->height = tx; 439 f->field = V4L2_FIELD_NONE; 440 f->colorspace = V4L2_COLORSPACE_RAW; 441 f->bytesperline = f->width * sizeof(u16); 442 f->sizeimage = f->width * f->height * sizeof(u16); 443 444 return 0; 445 } 446 447 static int rmi_f54_vidioc_s_input(struct file *file, void *priv, unsigned int i) 448 { 449 return rmi_f54_set_input(video_drvdata(file), i); 450 } 451 452 static int rmi_f54_vidioc_g_input(struct file *file, void *priv, 453 unsigned int *i) 454 { 455 struct f54_data *f54 = video_drvdata(file); 456 457 *i = f54->input; 458 459 return 0; 460 } 461 462 static int rmi_f54_vidioc_fmt(struct file *file, void *priv, 463 struct v4l2_format *f) 464 { 465 struct f54_data *f54 = video_drvdata(file); 466 467 f->fmt.pix = f54->format; 468 469 return 0; 470 } 471 472 static int rmi_f54_vidioc_enum_fmt(struct file *file, void *priv, 473 struct v4l2_fmtdesc *fmt) 474 { 475 struct f54_data *f54 = video_drvdata(file); 476 477 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 478 return -EINVAL; 479 480 if (fmt->index) 481 return -EINVAL; 482 483 fmt->pixelformat = f54->format.pixelformat; 484 485 return 0; 486 } 487 488 static int rmi_f54_vidioc_g_parm(struct file *file, void *fh, 489 struct v4l2_streamparm *a) 490 { 491 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 492 return -EINVAL; 493 494 a->parm.capture.readbuffers = 1; 495 a->parm.capture.timeperframe.numerator = 1; 496 a->parm.capture.timeperframe.denominator = 10; 497 return 0; 498 } 499 500 static const struct v4l2_ioctl_ops rmi_f54_video_ioctl_ops = { 501 .vidioc_querycap = rmi_f54_vidioc_querycap, 502 503 .vidioc_enum_fmt_vid_cap = rmi_f54_vidioc_enum_fmt, 504 .vidioc_s_fmt_vid_cap = rmi_f54_vidioc_fmt, 505 .vidioc_g_fmt_vid_cap = rmi_f54_vidioc_fmt, 506 .vidioc_try_fmt_vid_cap = rmi_f54_vidioc_fmt, 507 .vidioc_g_parm = rmi_f54_vidioc_g_parm, 508 509 .vidioc_enum_input = rmi_f54_vidioc_enum_input, 510 .vidioc_g_input = rmi_f54_vidioc_g_input, 511 .vidioc_s_input = rmi_f54_vidioc_s_input, 512 513 .vidioc_reqbufs = vb2_ioctl_reqbufs, 514 .vidioc_create_bufs = vb2_ioctl_create_bufs, 515 .vidioc_querybuf = vb2_ioctl_querybuf, 516 .vidioc_qbuf = vb2_ioctl_qbuf, 517 .vidioc_dqbuf = vb2_ioctl_dqbuf, 518 .vidioc_expbuf = vb2_ioctl_expbuf, 519 520 .vidioc_streamon = vb2_ioctl_streamon, 521 .vidioc_streamoff = vb2_ioctl_streamoff, 522 }; 523 524 static const struct video_device rmi_f54_video_device = { 525 .name = "Synaptics RMI4", 526 .fops = &rmi_f54_video_fops, 527 .ioctl_ops = &rmi_f54_video_ioctl_ops, 528 .release = video_device_release_empty, 529 .device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TOUCH | 530 V4L2_CAP_READWRITE | V4L2_CAP_STREAMING, 531 }; 532 533 static void rmi_f54_work(struct work_struct *work) 534 { 535 struct f54_data *f54 = container_of(work, struct f54_data, work.work); 536 struct rmi_function *fn = f54->fn; 537 u8 fifo[2]; 538 int report_size; 539 u8 command; 540 int error; 541 int i; 542 543 report_size = rmi_f54_get_report_size(f54); 544 if (report_size == 0) { 545 dev_err(&fn->dev, "Bad report size, report type=%d\n", 546 f54->report_type); 547 error = -EINVAL; 548 goto error; /* retry won't help */ 549 } 550 551 mutex_lock(&f54->data_mutex); 552 553 /* 554 * Need to check if command has completed. 555 * If not try again later. 556 */ 557 error = rmi_read(fn->rmi_dev, f54->fn->fd.command_base_addr, 558 &command); 559 if (error) { 560 dev_err(&fn->dev, "Failed to read back command\n"); 561 goto error; 562 } 563 if (command & F54_GET_REPORT) { 564 if (time_after(jiffies, f54->timeout)) { 565 dev_err(&fn->dev, "Get report command timed out\n"); 566 error = -ETIMEDOUT; 567 } 568 report_size = 0; 569 goto error; 570 } 571 572 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "Get report command completed, reading data\n"); 573 574 for (i = 0; i < report_size; i += F54_REPORT_DATA_SIZE) { 575 int size = min(F54_REPORT_DATA_SIZE, report_size - i); 576 577 fifo[0] = i & 0xff; 578 fifo[1] = i >> 8; 579 error = rmi_write_block(fn->rmi_dev, 580 fn->fd.data_base_addr + F54_FIFO_OFFSET, 581 fifo, sizeof(fifo)); 582 if (error) { 583 dev_err(&fn->dev, "Failed to set fifo start offset\n"); 584 goto abort; 585 } 586 587 error = rmi_read_block(fn->rmi_dev, fn->fd.data_base_addr + 588 F54_REPORT_DATA_OFFSET, 589 f54->report_data + i, size); 590 if (error) { 591 dev_err(&fn->dev, "%s: read [%d bytes] returned %d\n", 592 __func__, size, error); 593 goto abort; 594 } 595 } 596 597 abort: 598 f54->report_size = error ? 0 : report_size; 599 error: 600 if (error) 601 report_size = 0; 602 603 if (report_size == 0 && !error) { 604 queue_delayed_work(f54->workqueue, &f54->work, 605 msecs_to_jiffies(1)); 606 } else { 607 f54->is_busy = false; 608 complete(&f54->cmd_done); 609 } 610 611 mutex_unlock(&f54->data_mutex); 612 } 613 614 static int rmi_f54_config(struct rmi_function *fn) 615 { 616 struct rmi_driver *drv = fn->rmi_dev->driver; 617 618 drv->clear_irq_bits(fn->rmi_dev, fn->irq_mask); 619 620 return 0; 621 } 622 623 static int rmi_f54_detect(struct rmi_function *fn) 624 { 625 int error; 626 struct f54_data *f54; 627 u8 buf[6]; 628 629 f54 = dev_get_drvdata(&fn->dev); 630 631 error = rmi_read_block(fn->rmi_dev, fn->fd.query_base_addr, 632 buf, sizeof(buf)); 633 if (error) { 634 dev_err(&fn->dev, "%s: Failed to query F54 properties\n", 635 __func__); 636 return error; 637 } 638 639 f54->num_rx_electrodes = buf[0]; 640 f54->num_tx_electrodes = buf[1]; 641 f54->capabilities = buf[2]; 642 f54->clock_rate = buf[3] | (buf[4] << 8); 643 f54->family = buf[5]; 644 645 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 num_rx_electrodes: %d\n", 646 f54->num_rx_electrodes); 647 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 num_tx_electrodes: %d\n", 648 f54->num_tx_electrodes); 649 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 capabilities: 0x%x\n", 650 f54->capabilities); 651 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 clock rate: 0x%x\n", 652 f54->clock_rate); 653 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 family: 0x%x\n", 654 f54->family); 655 656 f54->is_busy = false; 657 658 return 0; 659 } 660 661 static int rmi_f54_probe(struct rmi_function *fn) 662 { 663 struct f54_data *f54; 664 int ret; 665 u8 rx, tx; 666 667 f54 = devm_kzalloc(&fn->dev, sizeof(struct f54_data), GFP_KERNEL); 668 if (!f54) 669 return -ENOMEM; 670 671 f54->fn = fn; 672 dev_set_drvdata(&fn->dev, f54); 673 674 ret = rmi_f54_detect(fn); 675 if (ret) 676 return ret; 677 678 mutex_init(&f54->data_mutex); 679 mutex_init(&f54->status_mutex); 680 681 rx = f54->num_rx_electrodes; 682 tx = f54->num_tx_electrodes; 683 f54->report_data = devm_kzalloc(&fn->dev, 684 array3_size(tx, rx, sizeof(u16)), 685 GFP_KERNEL); 686 if (f54->report_data == NULL) 687 return -ENOMEM; 688 689 INIT_DELAYED_WORK(&f54->work, rmi_f54_work); 690 691 f54->workqueue = create_singlethread_workqueue("rmi4-poller"); 692 if (!f54->workqueue) 693 return -ENOMEM; 694 695 rmi_f54_create_input_map(f54); 696 rmi_f54_set_input(f54, 0); 697 698 /* register video device */ 699 strlcpy(f54->v4l2.name, F54_NAME, sizeof(f54->v4l2.name)); 700 ret = v4l2_device_register(&fn->dev, &f54->v4l2); 701 if (ret) { 702 dev_err(&fn->dev, "Unable to register video dev.\n"); 703 goto remove_wq; 704 } 705 706 /* initialize the queue */ 707 mutex_init(&f54->lock); 708 f54->queue = rmi_f54_queue; 709 f54->queue.drv_priv = f54; 710 f54->queue.lock = &f54->lock; 711 f54->queue.dev = &fn->dev; 712 713 ret = vb2_queue_init(&f54->queue); 714 if (ret) 715 goto remove_v4l2; 716 717 f54->vdev = rmi_f54_video_device; 718 f54->vdev.v4l2_dev = &f54->v4l2; 719 f54->vdev.lock = &f54->lock; 720 f54->vdev.vfl_dir = VFL_DIR_RX; 721 f54->vdev.queue = &f54->queue; 722 video_set_drvdata(&f54->vdev, f54); 723 724 ret = video_register_device(&f54->vdev, VFL_TYPE_TOUCH, -1); 725 if (ret) { 726 dev_err(&fn->dev, "Unable to register video subdevice."); 727 goto remove_v4l2; 728 } 729 730 return 0; 731 732 remove_v4l2: 733 v4l2_device_unregister(&f54->v4l2); 734 remove_wq: 735 cancel_delayed_work_sync(&f54->work); 736 destroy_workqueue(f54->workqueue); 737 return ret; 738 } 739 740 static void rmi_f54_remove(struct rmi_function *fn) 741 { 742 struct f54_data *f54 = dev_get_drvdata(&fn->dev); 743 744 video_unregister_device(&f54->vdev); 745 v4l2_device_unregister(&f54->v4l2); 746 destroy_workqueue(f54->workqueue); 747 } 748 749 struct rmi_function_handler rmi_f54_handler = { 750 .driver = { 751 .name = F54_NAME, 752 }, 753 .func = 0x54, 754 .probe = rmi_f54_probe, 755 .config = rmi_f54_config, 756 .remove = rmi_f54_remove, 757 }; 758