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 size_t max_report_size; 108 int report_size; 109 int report_error; 110 111 bool is_busy; 112 struct mutex status_mutex; 113 struct mutex data_mutex; 114 115 struct workqueue_struct *workqueue; 116 struct delayed_work work; 117 unsigned long timeout; 118 119 struct completion cmd_done; 120 121 /* V4L2 support */ 122 struct v4l2_device v4l2; 123 struct v4l2_pix_format format; 124 struct video_device vdev; 125 struct vb2_queue queue; 126 struct mutex lock; 127 u32 sequence; 128 int input; 129 enum rmi_f54_report_type inputs[F54_MAX_REPORT_TYPE]; 130 }; 131 132 /* 133 * Basic checks on report_type to ensure we write a valid type 134 * to the sensor. 135 */ 136 static bool is_f54_report_type_valid(struct f54_data *f54, 137 enum rmi_f54_report_type reptype) 138 { 139 switch (reptype) { 140 case F54_8BIT_IMAGE: 141 return f54->capabilities & F54_CAP_IMAGE8; 142 case F54_16BIT_IMAGE: 143 case F54_RAW_16BIT_IMAGE: 144 return f54->capabilities & F54_CAP_IMAGE16; 145 case F54_TRUE_BASELINE: 146 return f54->capabilities & F54_CAP_IMAGE16; 147 case F54_FULL_RAW_CAP: 148 case F54_FULL_RAW_CAP_RX_OFFSET_REMOVED: 149 return true; 150 default: 151 return false; 152 } 153 } 154 155 static enum rmi_f54_report_type rmi_f54_get_reptype(struct f54_data *f54, 156 unsigned int i) 157 { 158 if (i >= F54_MAX_REPORT_TYPE) 159 return F54_REPORT_NONE; 160 161 return f54->inputs[i]; 162 } 163 164 static void rmi_f54_create_input_map(struct f54_data *f54) 165 { 166 int i = 0; 167 enum rmi_f54_report_type reptype; 168 169 for (reptype = 1; reptype < F54_MAX_REPORT_TYPE; reptype++) { 170 if (!is_f54_report_type_valid(f54, reptype)) 171 continue; 172 173 f54->inputs[i++] = reptype; 174 } 175 176 /* Remaining values are zero via kzalloc */ 177 } 178 179 static int rmi_f54_request_report(struct rmi_function *fn, u8 report_type) 180 { 181 struct f54_data *f54 = dev_get_drvdata(&fn->dev); 182 struct rmi_device *rmi_dev = fn->rmi_dev; 183 int error; 184 185 /* Write Report Type into F54_AD_Data0 */ 186 if (f54->report_type != report_type) { 187 error = rmi_write(rmi_dev, f54->fn->fd.data_base_addr, 188 report_type); 189 if (error) 190 return error; 191 f54->report_type = report_type; 192 } 193 194 /* 195 * Small delay after disabling interrupts to avoid race condition 196 * in firmare. This value is a bit higher than absolutely necessary. 197 * Should be removed once issue is resolved in firmware. 198 */ 199 usleep_range(2000, 3000); 200 201 mutex_lock(&f54->data_mutex); 202 203 error = rmi_write(rmi_dev, fn->fd.command_base_addr, F54_GET_REPORT); 204 if (error < 0) 205 goto unlock; 206 207 init_completion(&f54->cmd_done); 208 209 f54->is_busy = 1; 210 f54->timeout = jiffies + msecs_to_jiffies(100); 211 212 queue_delayed_work(f54->workqueue, &f54->work, 0); 213 214 unlock: 215 mutex_unlock(&f54->data_mutex); 216 217 return error; 218 } 219 220 static size_t rmi_f54_get_report_size(struct f54_data *f54) 221 { 222 struct rmi_device *rmi_dev = f54->fn->rmi_dev; 223 struct rmi_driver_data *drv_data = dev_get_drvdata(&rmi_dev->dev); 224 u8 rx = drv_data->num_rx_electrodes ? : f54->num_rx_electrodes; 225 u8 tx = drv_data->num_tx_electrodes ? : f54->num_tx_electrodes; 226 size_t size; 227 228 switch (rmi_f54_get_reptype(f54, f54->input)) { 229 case F54_8BIT_IMAGE: 230 size = rx * tx; 231 break; 232 case F54_16BIT_IMAGE: 233 case F54_RAW_16BIT_IMAGE: 234 case F54_TRUE_BASELINE: 235 case F54_FULL_RAW_CAP: 236 case F54_FULL_RAW_CAP_RX_OFFSET_REMOVED: 237 size = sizeof(u16) * rx * tx; 238 break; 239 default: 240 size = 0; 241 } 242 243 return size; 244 } 245 246 static int rmi_f54_get_pixel_fmt(enum rmi_f54_report_type reptype, u32 *pixfmt) 247 { 248 int ret = 0; 249 250 switch (reptype) { 251 case F54_8BIT_IMAGE: 252 *pixfmt = V4L2_TCH_FMT_DELTA_TD08; 253 break; 254 255 case F54_16BIT_IMAGE: 256 *pixfmt = V4L2_TCH_FMT_DELTA_TD16; 257 break; 258 259 case F54_RAW_16BIT_IMAGE: 260 case F54_TRUE_BASELINE: 261 case F54_FULL_RAW_CAP: 262 case F54_FULL_RAW_CAP_RX_OFFSET_REMOVED: 263 *pixfmt = V4L2_TCH_FMT_TU16; 264 break; 265 266 case F54_REPORT_NONE: 267 case F54_MAX_REPORT_TYPE: 268 ret = -EINVAL; 269 break; 270 } 271 272 return ret; 273 } 274 275 static const struct v4l2_file_operations rmi_f54_video_fops = { 276 .owner = THIS_MODULE, 277 .open = v4l2_fh_open, 278 .release = vb2_fop_release, 279 .unlocked_ioctl = video_ioctl2, 280 .read = vb2_fop_read, 281 .mmap = vb2_fop_mmap, 282 .poll = vb2_fop_poll, 283 }; 284 285 static int rmi_f54_queue_setup(struct vb2_queue *q, unsigned int *nbuffers, 286 unsigned int *nplanes, unsigned int sizes[], 287 struct device *alloc_devs[]) 288 { 289 struct f54_data *f54 = q->drv_priv; 290 291 if (*nplanes) 292 return sizes[0] < rmi_f54_get_report_size(f54) ? -EINVAL : 0; 293 294 *nplanes = 1; 295 sizes[0] = rmi_f54_get_report_size(f54); 296 297 return 0; 298 } 299 300 static void rmi_f54_buffer_queue(struct vb2_buffer *vb) 301 { 302 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 303 struct f54_data *f54 = vb2_get_drv_priv(vb->vb2_queue); 304 u16 *ptr; 305 enum vb2_buffer_state state; 306 enum rmi_f54_report_type reptype; 307 int ret; 308 309 mutex_lock(&f54->status_mutex); 310 311 vb2_set_plane_payload(vb, 0, 0); 312 reptype = rmi_f54_get_reptype(f54, f54->input); 313 if (reptype == F54_REPORT_NONE) { 314 state = VB2_BUF_STATE_ERROR; 315 goto done; 316 } 317 318 if (f54->is_busy) { 319 state = VB2_BUF_STATE_ERROR; 320 goto done; 321 } 322 323 ret = rmi_f54_request_report(f54->fn, reptype); 324 if (ret) { 325 dev_err(&f54->fn->dev, "Error requesting F54 report\n"); 326 state = VB2_BUF_STATE_ERROR; 327 goto done; 328 } 329 330 /* get frame data */ 331 mutex_lock(&f54->data_mutex); 332 333 while (f54->is_busy) { 334 mutex_unlock(&f54->data_mutex); 335 if (!wait_for_completion_timeout(&f54->cmd_done, 336 msecs_to_jiffies(1000))) { 337 dev_err(&f54->fn->dev, "Timed out\n"); 338 state = VB2_BUF_STATE_ERROR; 339 goto done; 340 } 341 mutex_lock(&f54->data_mutex); 342 } 343 344 if (f54->report_error) { 345 dev_err(&f54->fn->dev, "Error acquiring report: %d\n", f54->report_error); 346 state = VB2_BUF_STATE_ERROR; 347 goto data_done; 348 } 349 350 ptr = vb2_plane_vaddr(vb, 0); 351 if (!ptr) { 352 dev_err(&f54->fn->dev, "Error acquiring frame ptr\n"); 353 state = VB2_BUF_STATE_ERROR; 354 goto data_done; 355 } 356 357 memcpy(ptr, f54->report_data, f54->report_size); 358 vb2_set_plane_payload(vb, 0, rmi_f54_get_report_size(f54)); 359 state = VB2_BUF_STATE_DONE; 360 361 data_done: 362 mutex_unlock(&f54->data_mutex); 363 done: 364 vb->timestamp = ktime_get_ns(); 365 vbuf->field = V4L2_FIELD_NONE; 366 vbuf->sequence = f54->sequence++; 367 vb2_buffer_done(vb, state); 368 mutex_unlock(&f54->status_mutex); 369 } 370 371 static void rmi_f54_stop_streaming(struct vb2_queue *q) 372 { 373 struct f54_data *f54 = vb2_get_drv_priv(q); 374 375 f54->sequence = 0; 376 } 377 378 /* V4L2 structures */ 379 static const struct vb2_ops rmi_f54_queue_ops = { 380 .queue_setup = rmi_f54_queue_setup, 381 .buf_queue = rmi_f54_buffer_queue, 382 .stop_streaming = rmi_f54_stop_streaming, 383 }; 384 385 static const struct vb2_queue rmi_f54_queue = { 386 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE, 387 .io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF | VB2_READ, 388 .buf_struct_size = sizeof(struct vb2_v4l2_buffer), 389 .ops = &rmi_f54_queue_ops, 390 .mem_ops = &vb2_vmalloc_memops, 391 .timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC, 392 }; 393 394 static int rmi_f54_vidioc_querycap(struct file *file, void *priv, 395 struct v4l2_capability *cap) 396 { 397 struct f54_data *f54 = video_drvdata(file); 398 399 strscpy(cap->driver, F54_NAME, sizeof(cap->driver)); 400 strscpy(cap->card, SYNAPTICS_INPUT_DEVICE_NAME, sizeof(cap->card)); 401 snprintf(cap->bus_info, sizeof(cap->bus_info), 402 "rmi4:%s", dev_name(&f54->fn->dev)); 403 404 return 0; 405 } 406 407 static int rmi_f54_vidioc_enum_input(struct file *file, void *priv, 408 struct v4l2_input *i) 409 { 410 struct f54_data *f54 = video_drvdata(file); 411 enum rmi_f54_report_type reptype; 412 413 reptype = rmi_f54_get_reptype(f54, i->index); 414 if (reptype == F54_REPORT_NONE) 415 return -EINVAL; 416 417 i->type = V4L2_INPUT_TYPE_TOUCH; 418 419 strscpy(i->name, rmi_f54_report_type_names[reptype], sizeof(i->name)); 420 return 0; 421 } 422 423 static int rmi_f54_set_input(struct f54_data *f54, unsigned int i) 424 { 425 struct rmi_device *rmi_dev = f54->fn->rmi_dev; 426 struct rmi_driver_data *drv_data = dev_get_drvdata(&rmi_dev->dev); 427 u8 rx = drv_data->num_rx_electrodes ? : f54->num_rx_electrodes; 428 u8 tx = drv_data->num_tx_electrodes ? : f54->num_tx_electrodes; 429 struct v4l2_pix_format *f = &f54->format; 430 enum rmi_f54_report_type reptype; 431 int ret; 432 433 reptype = rmi_f54_get_reptype(f54, i); 434 if (reptype == F54_REPORT_NONE) 435 return -EINVAL; 436 437 ret = rmi_f54_get_pixel_fmt(reptype, &f->pixelformat); 438 if (ret) 439 return ret; 440 441 f54->input = i; 442 443 f->width = rx; 444 f->height = tx; 445 f->field = V4L2_FIELD_NONE; 446 f->colorspace = V4L2_COLORSPACE_RAW; 447 f->bytesperline = f->width * sizeof(u16); 448 f->sizeimage = f->width * f->height * sizeof(u16); 449 450 return 0; 451 } 452 453 static int rmi_f54_vidioc_s_input(struct file *file, void *priv, unsigned int i) 454 { 455 struct f54_data *f54 = video_drvdata(file); 456 457 if (vb2_is_busy(&f54->queue)) 458 return -EBUSY; 459 460 return rmi_f54_set_input(f54, i); 461 } 462 463 static int rmi_f54_vidioc_g_input(struct file *file, void *priv, 464 unsigned int *i) 465 { 466 struct f54_data *f54 = video_drvdata(file); 467 468 *i = f54->input; 469 470 return 0; 471 } 472 473 static int rmi_f54_vidioc_fmt(struct file *file, void *priv, 474 struct v4l2_format *f) 475 { 476 struct f54_data *f54 = video_drvdata(file); 477 478 f->fmt.pix = f54->format; 479 480 return 0; 481 } 482 483 static int rmi_f54_vidioc_enum_fmt(struct file *file, void *priv, 484 struct v4l2_fmtdesc *fmt) 485 { 486 struct f54_data *f54 = video_drvdata(file); 487 488 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 489 return -EINVAL; 490 491 if (fmt->index) 492 return -EINVAL; 493 494 fmt->pixelformat = f54->format.pixelformat; 495 496 return 0; 497 } 498 499 static int rmi_f54_vidioc_g_parm(struct file *file, void *fh, 500 struct v4l2_streamparm *a) 501 { 502 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) 503 return -EINVAL; 504 505 a->parm.capture.readbuffers = 1; 506 a->parm.capture.timeperframe.numerator = 1; 507 a->parm.capture.timeperframe.denominator = 10; 508 return 0; 509 } 510 511 static const struct v4l2_ioctl_ops rmi_f54_video_ioctl_ops = { 512 .vidioc_querycap = rmi_f54_vidioc_querycap, 513 514 .vidioc_enum_fmt_vid_cap = rmi_f54_vidioc_enum_fmt, 515 .vidioc_s_fmt_vid_cap = rmi_f54_vidioc_fmt, 516 .vidioc_g_fmt_vid_cap = rmi_f54_vidioc_fmt, 517 .vidioc_try_fmt_vid_cap = rmi_f54_vidioc_fmt, 518 .vidioc_g_parm = rmi_f54_vidioc_g_parm, 519 520 .vidioc_enum_input = rmi_f54_vidioc_enum_input, 521 .vidioc_g_input = rmi_f54_vidioc_g_input, 522 .vidioc_s_input = rmi_f54_vidioc_s_input, 523 524 .vidioc_reqbufs = vb2_ioctl_reqbufs, 525 .vidioc_create_bufs = vb2_ioctl_create_bufs, 526 .vidioc_querybuf = vb2_ioctl_querybuf, 527 .vidioc_qbuf = vb2_ioctl_qbuf, 528 .vidioc_dqbuf = vb2_ioctl_dqbuf, 529 .vidioc_expbuf = vb2_ioctl_expbuf, 530 531 .vidioc_streamon = vb2_ioctl_streamon, 532 .vidioc_streamoff = vb2_ioctl_streamoff, 533 }; 534 535 static const struct video_device rmi_f54_video_device = { 536 .name = "Synaptics RMI4", 537 .fops = &rmi_f54_video_fops, 538 .ioctl_ops = &rmi_f54_video_ioctl_ops, 539 .release = video_device_release_empty, 540 .device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TOUCH | 541 V4L2_CAP_READWRITE | V4L2_CAP_STREAMING, 542 }; 543 544 static void rmi_f54_work(struct work_struct *work) 545 { 546 struct f54_data *f54 = container_of(work, struct f54_data, work.work); 547 struct rmi_function *fn = f54->fn; 548 u8 fifo[2]; 549 int report_size; 550 u8 command; 551 int error; 552 int i; 553 554 mutex_lock(&f54->data_mutex); 555 556 report_size = rmi_f54_get_report_size(f54); 557 if (report_size == 0) { 558 dev_err(&fn->dev, "Bad report size, report type=%d\n", 559 f54->report_type); 560 error = -EINVAL; 561 goto out; /* retry won't help */ 562 } 563 564 if (report_size > f54->max_report_size) { 565 dev_err(&fn->dev, "Report size %d exceeds buffer size %zu\n", 566 report_size, f54->max_report_size); 567 error = -EINVAL; 568 goto out; 569 } 570 571 /* 572 * Need to check if command has completed. 573 * If not try again later. 574 */ 575 error = rmi_read(fn->rmi_dev, f54->fn->fd.command_base_addr, 576 &command); 577 if (error) { 578 dev_err(&fn->dev, "Failed to read back command\n"); 579 goto out; 580 } 581 if (command & F54_GET_REPORT) { 582 if (time_after(jiffies, f54->timeout)) { 583 dev_err(&fn->dev, "Get report command timed out\n"); 584 error = -ETIMEDOUT; 585 } 586 report_size = 0; 587 goto out; 588 } 589 590 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "Get report command completed, reading data\n"); 591 592 for (i = 0; i < report_size; i += F54_REPORT_DATA_SIZE) { 593 int size = min(F54_REPORT_DATA_SIZE, report_size - i); 594 595 fifo[0] = i & 0xff; 596 fifo[1] = i >> 8; 597 error = rmi_write_block(fn->rmi_dev, 598 fn->fd.data_base_addr + F54_FIFO_OFFSET, 599 fifo, sizeof(fifo)); 600 if (error) { 601 dev_err(&fn->dev, "Failed to set fifo start offset\n"); 602 goto out; 603 } 604 605 error = rmi_read_block(fn->rmi_dev, fn->fd.data_base_addr + 606 F54_REPORT_DATA_OFFSET, 607 f54->report_data + i, size); 608 if (error) { 609 dev_err(&fn->dev, "%s: read [%d bytes] returned %d\n", 610 __func__, size, error); 611 goto out; 612 } 613 } 614 615 out: 616 if (error) 617 report_size = 0; 618 619 f54->report_size = report_size; 620 f54->report_error = error; 621 622 if (report_size == 0 && !error) { 623 queue_delayed_work(f54->workqueue, &f54->work, 624 msecs_to_jiffies(1)); 625 } else { 626 f54->is_busy = false; 627 complete(&f54->cmd_done); 628 } 629 630 mutex_unlock(&f54->data_mutex); 631 } 632 633 static int rmi_f54_config(struct rmi_function *fn) 634 { 635 struct rmi_driver *drv = fn->rmi_dev->driver; 636 637 drv->clear_irq_bits(fn->rmi_dev, fn->irq_mask); 638 639 return 0; 640 } 641 642 static int rmi_f54_detect(struct rmi_function *fn) 643 { 644 int error; 645 struct f54_data *f54; 646 u8 buf[6]; 647 648 f54 = dev_get_drvdata(&fn->dev); 649 650 error = rmi_read_block(fn->rmi_dev, fn->fd.query_base_addr, 651 buf, sizeof(buf)); 652 if (error) { 653 dev_err(&fn->dev, "%s: Failed to query F54 properties\n", 654 __func__); 655 return error; 656 } 657 658 f54->num_rx_electrodes = buf[0]; 659 f54->num_tx_electrodes = buf[1]; 660 f54->capabilities = buf[2]; 661 f54->clock_rate = buf[3] | (buf[4] << 8); 662 f54->family = buf[5]; 663 664 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 num_rx_electrodes: %d\n", 665 f54->num_rx_electrodes); 666 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 num_tx_electrodes: %d\n", 667 f54->num_tx_electrodes); 668 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 capabilities: 0x%x\n", 669 f54->capabilities); 670 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 clock rate: 0x%x\n", 671 f54->clock_rate); 672 rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F54 family: 0x%x\n", 673 f54->family); 674 675 f54->is_busy = false; 676 677 return 0; 678 } 679 680 static int rmi_f54_probe(struct rmi_function *fn) 681 { 682 struct f54_data *f54; 683 int ret; 684 u8 rx, tx; 685 686 f54 = devm_kzalloc(&fn->dev, sizeof(struct f54_data), GFP_KERNEL); 687 if (!f54) 688 return -ENOMEM; 689 690 f54->fn = fn; 691 dev_set_drvdata(&fn->dev, f54); 692 693 ret = rmi_f54_detect(fn); 694 if (ret) 695 return ret; 696 697 mutex_init(&f54->data_mutex); 698 mutex_init(&f54->status_mutex); 699 700 rx = f54->num_rx_electrodes; 701 tx = f54->num_tx_electrodes; 702 f54->max_report_size = array3_size(tx, rx, sizeof(u16)); 703 f54->report_data = devm_kzalloc(&fn->dev, f54->max_report_size, 704 GFP_KERNEL); 705 if (f54->report_data == NULL) 706 return -ENOMEM; 707 708 INIT_DELAYED_WORK(&f54->work, rmi_f54_work); 709 710 f54->workqueue = create_singlethread_workqueue("rmi4-poller"); 711 if (!f54->workqueue) 712 return -ENOMEM; 713 714 rmi_f54_create_input_map(f54); 715 rmi_f54_set_input(f54, 0); 716 717 /* register video device */ 718 strscpy(f54->v4l2.name, F54_NAME, sizeof(f54->v4l2.name)); 719 ret = v4l2_device_register(&fn->dev, &f54->v4l2); 720 if (ret) { 721 dev_err(&fn->dev, "Unable to register video dev.\n"); 722 goto remove_wq; 723 } 724 725 /* initialize the queue */ 726 mutex_init(&f54->lock); 727 f54->queue = rmi_f54_queue; 728 f54->queue.drv_priv = f54; 729 f54->queue.lock = &f54->lock; 730 f54->queue.dev = &fn->dev; 731 732 ret = vb2_queue_init(&f54->queue); 733 if (ret) 734 goto remove_v4l2; 735 736 f54->vdev = rmi_f54_video_device; 737 f54->vdev.v4l2_dev = &f54->v4l2; 738 f54->vdev.lock = &f54->lock; 739 f54->vdev.vfl_dir = VFL_DIR_RX; 740 f54->vdev.queue = &f54->queue; 741 video_set_drvdata(&f54->vdev, f54); 742 743 ret = video_register_device(&f54->vdev, VFL_TYPE_TOUCH, -1); 744 if (ret) { 745 dev_err(&fn->dev, "Unable to register video subdevice."); 746 goto remove_v4l2; 747 } 748 749 return 0; 750 751 remove_v4l2: 752 v4l2_device_unregister(&f54->v4l2); 753 remove_wq: 754 cancel_delayed_work_sync(&f54->work); 755 destroy_workqueue(f54->workqueue); 756 return ret; 757 } 758 759 static void rmi_f54_remove(struct rmi_function *fn) 760 { 761 struct f54_data *f54 = dev_get_drvdata(&fn->dev); 762 763 video_unregister_device(&f54->vdev); 764 v4l2_device_unregister(&f54->v4l2); 765 destroy_workqueue(f54->workqueue); 766 } 767 768 struct rmi_function_handler rmi_f54_handler = { 769 .driver = { 770 .name = F54_NAME, 771 }, 772 .func = 0x54, 773 .probe = rmi_f54_probe, 774 .config = rmi_f54_config, 775 .remove = rmi_f54_remove, 776 }; 777