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 /* Fixed sizes of reports */ 35 #define F54_QUERY_LEN 27 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_8BIT_IMAGE: Normalized 8-Bit Image Report. The capacitance variance 46 * from baseline for each pixel. 47 * 48 * @F54_16BIT_IMAGE: Normalized 16-Bit Image Report. The capacitance variance 49 * from baseline for each pixel. 50 * 51 * @F54_RAW_16BIT_IMAGE: 52 * Raw 16-Bit Image Report. The raw capacitance for each 53 * pixel. 54 * 55 * @F54_TRUE_BASELINE: True Baseline Report. The baseline capacitance for each 56 * pixel. 57 * 58 * @F54_FULL_RAW_CAP: Full Raw Capacitance Report. The raw capacitance with 59 * low reference set to its minimum value and high 60 * reference set to its maximum value. 61 * 62 * @F54_FULL_RAW_CAP_RX_OFFSET_REMOVED: 63 * Full Raw Capacitance with Receiver Offset Removed 64 * Report. Set Low reference to its minimum value and high 65 * references to its maximum value, then report the raw 66 * capacitance for each pixel. 67 */ 68 enum rmi_f54_report_type { 69 F54_REPORT_NONE = 0, 70 F54_8BIT_IMAGE = 1, 71 F54_16BIT_IMAGE = 2, 72 F54_RAW_16BIT_IMAGE = 3, 73 F54_TRUE_BASELINE = 9, 74 F54_FULL_RAW_CAP = 19, 75 F54_FULL_RAW_CAP_RX_OFFSET_REMOVED = 20, 76 F54_MAX_REPORT_TYPE, 77 }; 78 79 const char *rmi_f54_report_type_names[] = { 80 [F54_REPORT_NONE] = "Unknown", 81 [F54_8BIT_IMAGE] = "Normalized 8-Bit Image", 82 [F54_16BIT_IMAGE] = "Normalized 16-Bit Image", 83 [F54_RAW_16BIT_IMAGE] = "Raw 16-Bit Image", 84 [F54_TRUE_BASELINE] = "True Baseline", 85 [F54_FULL_RAW_CAP] = "Full Raw Capacitance", 86 [F54_FULL_RAW_CAP_RX_OFFSET_REMOVED] 87 = "Full Raw Capacitance RX Offset Removed", 88 }; 89 90 struct rmi_f54_reports { 91 int start; 92 int size; 93 }; 94 95 struct f54_data { 96 struct rmi_function *fn; 97 98 u8 qry[F54_QUERY_LEN]; 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 struct rmi_f54_reports standard_report[2]; 109 110 bool is_busy; 111 struct mutex status_mutex; 112 struct mutex data_mutex; 113 114 struct workqueue_struct *workqueue; 115 struct delayed_work work; 116 unsigned long timeout; 117 118 struct completion cmd_done; 119 120 /* V4L2 support */ 121 struct v4l2_device v4l2; 122 struct v4l2_pix_format format; 123 struct video_device vdev; 124 struct vb2_queue queue; 125 struct mutex lock; 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 f54_data *f54 = vb2_get_drv_priv(vb->vb2_queue); 301 u16 *ptr; 302 enum vb2_buffer_state state; 303 enum rmi_f54_report_type reptype; 304 int ret; 305 306 mutex_lock(&f54->status_mutex); 307 308 reptype = rmi_f54_get_reptype(f54, f54->input); 309 if (reptype == F54_REPORT_NONE) { 310 state = VB2_BUF_STATE_ERROR; 311 goto done; 312 } 313 314 if (f54->is_busy) { 315 state = VB2_BUF_STATE_ERROR; 316 goto done; 317 } 318 319 ret = rmi_f54_request_report(f54->fn, reptype); 320 if (ret) { 321 dev_err(&f54->fn->dev, "Error requesting F54 report\n"); 322 state = VB2_BUF_STATE_ERROR; 323 goto done; 324 } 325 326 /* get frame data */ 327 mutex_lock(&f54->data_mutex); 328 329 while (f54->is_busy) { 330 mutex_unlock(&f54->data_mutex); 331 if (!wait_for_completion_timeout(&f54->cmd_done, 332 msecs_to_jiffies(1000))) { 333 dev_err(&f54->fn->dev, "Timed out\n"); 334 state = VB2_BUF_STATE_ERROR; 335 goto done; 336 } 337 mutex_lock(&f54->data_mutex); 338 } 339 340 ptr = vb2_plane_vaddr(vb, 0); 341 if (!ptr) { 342 dev_err(&f54->fn->dev, "Error acquiring frame ptr\n"); 343 state = VB2_BUF_STATE_ERROR; 344 goto data_done; 345 } 346 347 memcpy(ptr, f54->report_data, f54->report_size); 348 vb2_set_plane_payload(vb, 0, rmi_f54_get_report_size(f54)); 349 state = VB2_BUF_STATE_DONE; 350 351 data_done: 352 mutex_unlock(&f54->data_mutex); 353 done: 354 vb2_buffer_done(vb, state); 355 mutex_unlock(&f54->status_mutex); 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 .wait_prepare = vb2_ops_wait_prepare, 363 .wait_finish = vb2_ops_wait_finish, 364 }; 365 366 static const struct vb2_queue rmi_f54_queue = { 367 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE, 368 .io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF | VB2_READ, 369 .buf_struct_size = sizeof(struct vb2_buffer), 370 .ops = &rmi_f54_queue_ops, 371 .mem_ops = &vb2_vmalloc_memops, 372 .timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC, 373 .min_buffers_needed = 1, 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 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 464 return -EINVAL; 465 466 switch (fmt->index) { 467 case 0: 468 fmt->pixelformat = V4L2_TCH_FMT_DELTA_TD16; 469 break; 470 471 case 1: 472 fmt->pixelformat = V4L2_TCH_FMT_DELTA_TD08; 473 break; 474 475 case 2: 476 fmt->pixelformat = V4L2_TCH_FMT_TU16; 477 break; 478 479 default: 480 return -EINVAL; 481 } 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 struct rmi_f54_reports *report; 537 int report_size; 538 u8 command; 539 u8 *data; 540 int error; 541 542 data = f54->report_data; 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 f54->standard_report[0].size = report_size; 551 report = f54->standard_report; 552 553 mutex_lock(&f54->data_mutex); 554 555 /* 556 * Need to check if command has completed. 557 * If not try again later. 558 */ 559 error = rmi_read(fn->rmi_dev, f54->fn->fd.command_base_addr, 560 &command); 561 if (error) { 562 dev_err(&fn->dev, "Failed to read back command\n"); 563 goto error; 564 } 565 if (command & F54_GET_REPORT) { 566 if (time_after(jiffies, f54->timeout)) { 567 dev_err(&fn->dev, "Get report command timed out\n"); 568 error = -ETIMEDOUT; 569 } 570 report_size = 0; 571 goto error; 572 } 573 574 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "Get report command completed, reading data\n"); 575 576 report_size = 0; 577 for (; report->size; report++) { 578 fifo[0] = report->start & 0xff; 579 fifo[1] = (report->start >> 8) & 0xff; 580 error = rmi_write_block(fn->rmi_dev, 581 fn->fd.data_base_addr + F54_FIFO_OFFSET, 582 fifo, sizeof(fifo)); 583 if (error) { 584 dev_err(&fn->dev, "Failed to set fifo start offset\n"); 585 goto abort; 586 } 587 588 error = rmi_read_block(fn->rmi_dev, fn->fd.data_base_addr + 589 F54_REPORT_DATA_OFFSET, data, 590 report->size); 591 if (error) { 592 dev_err(&fn->dev, "%s: read [%d bytes] returned %d\n", 593 __func__, report->size, error); 594 goto abort; 595 } 596 data += report->size; 597 report_size += report->size; 598 } 599 600 abort: 601 f54->report_size = error ? 0 : report_size; 602 error: 603 if (error) 604 report_size = 0; 605 606 if (report_size == 0 && !error) { 607 queue_delayed_work(f54->workqueue, &f54->work, 608 msecs_to_jiffies(1)); 609 } else { 610 f54->is_busy = false; 611 complete(&f54->cmd_done); 612 } 613 614 mutex_unlock(&f54->data_mutex); 615 } 616 617 static int rmi_f54_attention(struct rmi_function *fn, unsigned long *irqbits) 618 { 619 return 0; 620 } 621 622 static int rmi_f54_config(struct rmi_function *fn) 623 { 624 struct rmi_driver *drv = fn->rmi_dev->driver; 625 626 drv->set_irq_bits(fn->rmi_dev, fn->irq_mask); 627 628 return 0; 629 } 630 631 static int rmi_f54_detect(struct rmi_function *fn) 632 { 633 int error; 634 struct f54_data *f54; 635 636 f54 = dev_get_drvdata(&fn->dev); 637 638 error = rmi_read_block(fn->rmi_dev, fn->fd.query_base_addr, 639 &f54->qry, sizeof(f54->qry)); 640 if (error) { 641 dev_err(&fn->dev, "%s: Failed to query F54 properties\n", 642 __func__); 643 return error; 644 } 645 646 f54->num_rx_electrodes = f54->qry[0]; 647 f54->num_tx_electrodes = f54->qry[1]; 648 f54->capabilities = f54->qry[2]; 649 f54->clock_rate = f54->qry[3] | (f54->qry[4] << 8); 650 f54->family = f54->qry[5]; 651 652 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 num_rx_electrodes: %d\n", 653 f54->num_rx_electrodes); 654 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 num_tx_electrodes: %d\n", 655 f54->num_tx_electrodes); 656 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 capabilities: 0x%x\n", 657 f54->capabilities); 658 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 clock rate: 0x%x\n", 659 f54->clock_rate); 660 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 family: 0x%x\n", 661 f54->family); 662 663 f54->is_busy = false; 664 665 return 0; 666 } 667 668 static int rmi_f54_probe(struct rmi_function *fn) 669 { 670 struct f54_data *f54; 671 int ret; 672 u8 rx, tx; 673 674 f54 = devm_kzalloc(&fn->dev, sizeof(struct f54_data), GFP_KERNEL); 675 if (!f54) 676 return -ENOMEM; 677 678 f54->fn = fn; 679 dev_set_drvdata(&fn->dev, f54); 680 681 ret = rmi_f54_detect(fn); 682 if (ret) 683 return ret; 684 685 mutex_init(&f54->data_mutex); 686 mutex_init(&f54->status_mutex); 687 688 rx = f54->num_rx_electrodes; 689 tx = f54->num_tx_electrodes; 690 f54->report_data = devm_kzalloc(&fn->dev, 691 sizeof(u16) * tx * rx, 692 GFP_KERNEL); 693 if (f54->report_data == NULL) 694 return -ENOMEM; 695 696 INIT_DELAYED_WORK(&f54->work, rmi_f54_work); 697 698 f54->workqueue = create_singlethread_workqueue("rmi4-poller"); 699 if (!f54->workqueue) 700 return -ENOMEM; 701 702 rmi_f54_create_input_map(f54); 703 704 /* register video device */ 705 strlcpy(f54->v4l2.name, F54_NAME, sizeof(f54->v4l2.name)); 706 ret = v4l2_device_register(&fn->dev, &f54->v4l2); 707 if (ret) { 708 dev_err(&fn->dev, "Unable to register video dev.\n"); 709 goto remove_wq; 710 } 711 712 /* initialize the queue */ 713 mutex_init(&f54->lock); 714 f54->queue = rmi_f54_queue; 715 f54->queue.drv_priv = f54; 716 f54->queue.lock = &f54->lock; 717 f54->queue.dev = &fn->dev; 718 719 ret = vb2_queue_init(&f54->queue); 720 if (ret) 721 goto remove_v4l2; 722 723 f54->vdev = rmi_f54_video_device; 724 f54->vdev.v4l2_dev = &f54->v4l2; 725 f54->vdev.lock = &f54->lock; 726 f54->vdev.vfl_dir = VFL_DIR_RX; 727 f54->vdev.queue = &f54->queue; 728 video_set_drvdata(&f54->vdev, f54); 729 730 ret = video_register_device(&f54->vdev, VFL_TYPE_TOUCH, -1); 731 if (ret) { 732 dev_err(&fn->dev, "Unable to register video subdevice."); 733 goto remove_v4l2; 734 } 735 736 return 0; 737 738 remove_v4l2: 739 v4l2_device_unregister(&f54->v4l2); 740 remove_wq: 741 cancel_delayed_work_sync(&f54->work); 742 flush_workqueue(f54->workqueue); 743 destroy_workqueue(f54->workqueue); 744 return ret; 745 } 746 747 static void rmi_f54_remove(struct rmi_function *fn) 748 { 749 struct f54_data *f54 = dev_get_drvdata(&fn->dev); 750 751 video_unregister_device(&f54->vdev); 752 v4l2_device_unregister(&f54->v4l2); 753 } 754 755 struct rmi_function_handler rmi_f54_handler = { 756 .driver = { 757 .name = F54_NAME, 758 }, 759 .func = 0x54, 760 .probe = rmi_f54_probe, 761 .config = rmi_f54_config, 762 .attention = rmi_f54_attention, 763 .remove = rmi_f54_remove, 764 }; 765