1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * HT16K33 driver 4 * 5 * Author: Robin van der Gracht <robin@protonic.nl> 6 * 7 * Copyright: (C) 2016 Protonic Holland. 8 * Copyright (C) 2021 Glider bv 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/interrupt.h> 14 #include <linux/i2c.h> 15 #include <linux/property.h> 16 #include <linux/fb.h> 17 #include <linux/backlight.h> 18 #include <linux/container_of.h> 19 #include <linux/input.h> 20 #include <linux/input/matrix_keypad.h> 21 #include <linux/leds.h> 22 #include <linux/workqueue.h> 23 #include <linux/mm.h> 24 25 #include <linux/map_to_7segment.h> 26 #include <linux/map_to_14segment.h> 27 28 #include <asm/unaligned.h> 29 30 #include "line-display.h" 31 32 /* Registers */ 33 #define REG_SYSTEM_SETUP 0x20 34 #define REG_SYSTEM_SETUP_OSC_ON BIT(0) 35 36 #define REG_DISPLAY_SETUP 0x80 37 #define REG_DISPLAY_SETUP_ON BIT(0) 38 #define REG_DISPLAY_SETUP_BLINK_OFF (0 << 1) 39 #define REG_DISPLAY_SETUP_BLINK_2HZ (1 << 1) 40 #define REG_DISPLAY_SETUP_BLINK_1HZ (2 << 1) 41 #define REG_DISPLAY_SETUP_BLINK_0HZ5 (3 << 1) 42 43 #define REG_ROWINT_SET 0xA0 44 #define REG_ROWINT_SET_INT_EN BIT(0) 45 #define REG_ROWINT_SET_INT_ACT_HIGH BIT(1) 46 47 #define REG_BRIGHTNESS 0xE0 48 49 /* Defines */ 50 #define DRIVER_NAME "ht16k33" 51 52 #define MIN_BRIGHTNESS 0x1 53 #define MAX_BRIGHTNESS 0x10 54 55 #define HT16K33_MATRIX_LED_MAX_COLS 8 56 #define HT16K33_MATRIX_LED_MAX_ROWS 16 57 #define HT16K33_MATRIX_KEYPAD_MAX_COLS 3 58 #define HT16K33_MATRIX_KEYPAD_MAX_ROWS 12 59 60 #define BYTES_PER_ROW (HT16K33_MATRIX_LED_MAX_ROWS / 8) 61 #define HT16K33_FB_SIZE (HT16K33_MATRIX_LED_MAX_COLS * BYTES_PER_ROW) 62 63 enum display_type { 64 DISP_MATRIX = 0, 65 DISP_QUAD_7SEG, 66 DISP_QUAD_14SEG, 67 }; 68 69 struct ht16k33_keypad { 70 struct i2c_client *client; 71 struct input_dev *dev; 72 uint32_t cols; 73 uint32_t rows; 74 uint32_t row_shift; 75 uint32_t debounce_ms; 76 uint16_t last_key_state[HT16K33_MATRIX_KEYPAD_MAX_COLS]; 77 78 wait_queue_head_t wait; 79 bool stopped; 80 }; 81 82 struct ht16k33_fbdev { 83 struct fb_info *info; 84 uint32_t refresh_rate; 85 uint8_t *buffer; 86 uint8_t *cache; 87 }; 88 89 struct ht16k33_priv { 90 struct i2c_client *client; 91 struct delayed_work work; 92 struct led_classdev led; 93 struct ht16k33_keypad keypad; 94 union { 95 struct ht16k33_fbdev fbdev; 96 struct linedisp linedisp; 97 }; 98 enum display_type type; 99 uint8_t blink; 100 }; 101 102 #define ht16k33_work_to_priv(p) \ 103 container_of(p, struct ht16k33_priv, work.work) 104 105 #define ht16k33_led_to_priv(p) \ 106 container_of(p, struct ht16k33_priv, led) 107 108 #define ht16k33_linedisp_to_priv(p) \ 109 container_of(p, struct ht16k33_priv, linedisp) 110 111 static const struct fb_fix_screeninfo ht16k33_fb_fix = { 112 .id = DRIVER_NAME, 113 .type = FB_TYPE_PACKED_PIXELS, 114 .visual = FB_VISUAL_MONO10, 115 .xpanstep = 0, 116 .ypanstep = 0, 117 .ywrapstep = 0, 118 .line_length = HT16K33_MATRIX_LED_MAX_ROWS, 119 .accel = FB_ACCEL_NONE, 120 }; 121 122 static const struct fb_var_screeninfo ht16k33_fb_var = { 123 .xres = HT16K33_MATRIX_LED_MAX_ROWS, 124 .yres = HT16K33_MATRIX_LED_MAX_COLS, 125 .xres_virtual = HT16K33_MATRIX_LED_MAX_ROWS, 126 .yres_virtual = HT16K33_MATRIX_LED_MAX_COLS, 127 .bits_per_pixel = 1, 128 .red = { 0, 1, 0 }, 129 .green = { 0, 1, 0 }, 130 .blue = { 0, 1, 0 }, 131 .left_margin = 0, 132 .right_margin = 0, 133 .upper_margin = 0, 134 .lower_margin = 0, 135 .vmode = FB_VMODE_NONINTERLACED, 136 }; 137 138 static int ht16k33_display_on(struct ht16k33_priv *priv) 139 { 140 uint8_t data = REG_DISPLAY_SETUP | REG_DISPLAY_SETUP_ON | priv->blink; 141 142 return i2c_smbus_write_byte(priv->client, data); 143 } 144 145 static int ht16k33_display_off(struct ht16k33_priv *priv) 146 { 147 return i2c_smbus_write_byte(priv->client, REG_DISPLAY_SETUP); 148 } 149 150 static int ht16k33_brightness_set(struct ht16k33_priv *priv, 151 unsigned int brightness) 152 { 153 int err; 154 155 if (brightness == 0) { 156 priv->blink = REG_DISPLAY_SETUP_BLINK_OFF; 157 return ht16k33_display_off(priv); 158 } 159 160 err = ht16k33_display_on(priv); 161 if (err) 162 return err; 163 164 return i2c_smbus_write_byte(priv->client, 165 REG_BRIGHTNESS | (brightness - 1)); 166 } 167 168 static int ht16k33_brightness_set_blocking(struct led_classdev *led_cdev, 169 enum led_brightness brightness) 170 { 171 struct ht16k33_priv *priv = ht16k33_led_to_priv(led_cdev); 172 173 return ht16k33_brightness_set(priv, brightness); 174 } 175 176 static int ht16k33_blink_set(struct led_classdev *led_cdev, 177 unsigned long *delay_on, unsigned long *delay_off) 178 { 179 struct ht16k33_priv *priv = ht16k33_led_to_priv(led_cdev); 180 unsigned int delay; 181 uint8_t blink; 182 int err; 183 184 if (!*delay_on && !*delay_off) { 185 blink = REG_DISPLAY_SETUP_BLINK_1HZ; 186 delay = 1000; 187 } else if (*delay_on <= 750) { 188 blink = REG_DISPLAY_SETUP_BLINK_2HZ; 189 delay = 500; 190 } else if (*delay_on <= 1500) { 191 blink = REG_DISPLAY_SETUP_BLINK_1HZ; 192 delay = 1000; 193 } else { 194 blink = REG_DISPLAY_SETUP_BLINK_0HZ5; 195 delay = 2000; 196 } 197 198 err = i2c_smbus_write_byte(priv->client, 199 REG_DISPLAY_SETUP | REG_DISPLAY_SETUP_ON | 200 blink); 201 if (err) 202 return err; 203 204 priv->blink = blink; 205 *delay_on = *delay_off = delay; 206 return 0; 207 } 208 209 static void ht16k33_fb_queue(struct ht16k33_priv *priv) 210 { 211 struct ht16k33_fbdev *fbdev = &priv->fbdev; 212 213 schedule_delayed_work(&priv->work, HZ / fbdev->refresh_rate); 214 } 215 216 /* 217 * This gets the fb data from cache and copies it to ht16k33 display RAM 218 */ 219 static void ht16k33_fb_update(struct work_struct *work) 220 { 221 struct ht16k33_priv *priv = ht16k33_work_to_priv(work); 222 struct ht16k33_fbdev *fbdev = &priv->fbdev; 223 224 uint8_t *p1, *p2; 225 int len, pos = 0, first = -1; 226 227 p1 = fbdev->cache; 228 p2 = fbdev->buffer; 229 230 /* Search for the first byte with changes */ 231 while (pos < HT16K33_FB_SIZE && first < 0) { 232 if (*(p1++) - *(p2++)) 233 first = pos; 234 pos++; 235 } 236 237 /* No changes found */ 238 if (first < 0) 239 goto requeue; 240 241 len = HT16K33_FB_SIZE - first; 242 p1 = fbdev->cache + HT16K33_FB_SIZE - 1; 243 p2 = fbdev->buffer + HT16K33_FB_SIZE - 1; 244 245 /* Determine i2c transfer length */ 246 while (len > 1) { 247 if (*(p1--) - *(p2--)) 248 break; 249 len--; 250 } 251 252 p1 = fbdev->cache + first; 253 p2 = fbdev->buffer + first; 254 if (!i2c_smbus_write_i2c_block_data(priv->client, first, len, p2)) 255 memcpy(p1, p2, len); 256 requeue: 257 ht16k33_fb_queue(priv); 258 } 259 260 static int ht16k33_initialize(struct ht16k33_priv *priv) 261 { 262 uint8_t data[HT16K33_FB_SIZE]; 263 uint8_t byte; 264 int err; 265 266 /* Clear RAM (8 * 16 bits) */ 267 memset(data, 0, sizeof(data)); 268 err = i2c_smbus_write_block_data(priv->client, 0, sizeof(data), data); 269 if (err) 270 return err; 271 272 /* Turn on internal oscillator */ 273 byte = REG_SYSTEM_SETUP_OSC_ON | REG_SYSTEM_SETUP; 274 err = i2c_smbus_write_byte(priv->client, byte); 275 if (err) 276 return err; 277 278 /* Configure INT pin */ 279 byte = REG_ROWINT_SET | REG_ROWINT_SET_INT_ACT_HIGH; 280 if (priv->client->irq > 0) 281 byte |= REG_ROWINT_SET_INT_EN; 282 return i2c_smbus_write_byte(priv->client, byte); 283 } 284 285 static int ht16k33_bl_update_status(struct backlight_device *bl) 286 { 287 const int brightness = backlight_get_brightness(bl); 288 struct ht16k33_priv *priv = bl_get_data(bl); 289 290 return ht16k33_brightness_set(priv, brightness); 291 } 292 293 static const struct backlight_ops ht16k33_bl_ops = { 294 .update_status = ht16k33_bl_update_status, 295 }; 296 297 /* 298 * Blank events will be passed to the actual device handling the backlight when 299 * we return zero here. 300 */ 301 static int ht16k33_blank(int blank, struct fb_info *info) 302 { 303 return 0; 304 } 305 306 static int ht16k33_mmap(struct fb_info *info, struct vm_area_struct *vma) 307 { 308 struct ht16k33_priv *priv = info->par; 309 struct page *pages = virt_to_page(priv->fbdev.buffer); 310 311 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); 312 313 return vm_map_pages_zero(vma, &pages, 1); 314 } 315 316 static const struct fb_ops ht16k33_fb_ops = { 317 .owner = THIS_MODULE, 318 __FB_DEFAULT_SYSMEM_OPS_RDWR, 319 .fb_blank = ht16k33_blank, 320 __FB_DEFAULT_SYSMEM_OPS_DRAW, 321 .fb_mmap = ht16k33_mmap, 322 }; 323 324 /* 325 * This gets the keys from keypad and reports it to input subsystem. 326 * Returns true if a key is pressed. 327 */ 328 static bool ht16k33_keypad_scan(struct ht16k33_keypad *keypad) 329 { 330 const unsigned short *keycodes = keypad->dev->keycode; 331 u16 new_state[HT16K33_MATRIX_KEYPAD_MAX_COLS]; 332 __le16 data[HT16K33_MATRIX_KEYPAD_MAX_COLS]; 333 unsigned long bits_changed; 334 int row, col, code; 335 int rc; 336 bool pressed = false; 337 338 rc = i2c_smbus_read_i2c_block_data(keypad->client, 0x40, 339 sizeof(data), (u8 *)data); 340 if (rc != sizeof(data)) { 341 dev_err(&keypad->client->dev, 342 "Failed to read key data, rc=%d\n", rc); 343 return false; 344 } 345 346 for (col = 0; col < keypad->cols; col++) { 347 new_state[col] = le16_to_cpu(data[col]); 348 if (new_state[col]) 349 pressed = true; 350 bits_changed = keypad->last_key_state[col] ^ new_state[col]; 351 352 for_each_set_bit(row, &bits_changed, BITS_PER_LONG) { 353 code = MATRIX_SCAN_CODE(row, col, keypad->row_shift); 354 input_event(keypad->dev, EV_MSC, MSC_SCAN, code); 355 input_report_key(keypad->dev, keycodes[code], 356 new_state[col] & BIT(row)); 357 } 358 } 359 input_sync(keypad->dev); 360 memcpy(keypad->last_key_state, new_state, sizeof(u16) * keypad->cols); 361 362 return pressed; 363 } 364 365 static irqreturn_t ht16k33_keypad_irq_thread(int irq, void *dev) 366 { 367 struct ht16k33_keypad *keypad = dev; 368 369 do { 370 wait_event_timeout(keypad->wait, keypad->stopped, 371 msecs_to_jiffies(keypad->debounce_ms)); 372 if (keypad->stopped) 373 break; 374 } while (ht16k33_keypad_scan(keypad)); 375 376 return IRQ_HANDLED; 377 } 378 379 static int ht16k33_keypad_start(struct input_dev *dev) 380 { 381 struct ht16k33_keypad *keypad = input_get_drvdata(dev); 382 383 keypad->stopped = false; 384 mb(); 385 enable_irq(keypad->client->irq); 386 387 return 0; 388 } 389 390 static void ht16k33_keypad_stop(struct input_dev *dev) 391 { 392 struct ht16k33_keypad *keypad = input_get_drvdata(dev); 393 394 keypad->stopped = true; 395 mb(); 396 wake_up(&keypad->wait); 397 disable_irq(keypad->client->irq); 398 } 399 400 static void ht16k33_seg7_update(struct work_struct *work) 401 { 402 struct ht16k33_priv *priv = ht16k33_work_to_priv(work); 403 struct linedisp_map *map = priv->linedisp.map; 404 char *s = priv->linedisp.buf; 405 uint8_t buf[9]; 406 407 buf[0] = map_to_seg7(&map->map.seg7, *s++); 408 buf[1] = 0; 409 buf[2] = map_to_seg7(&map->map.seg7, *s++); 410 buf[3] = 0; 411 buf[4] = 0; 412 buf[5] = 0; 413 buf[6] = map_to_seg7(&map->map.seg7, *s++); 414 buf[7] = 0; 415 buf[8] = map_to_seg7(&map->map.seg7, *s++); 416 417 i2c_smbus_write_i2c_block_data(priv->client, 0, ARRAY_SIZE(buf), buf); 418 } 419 420 static void ht16k33_seg14_update(struct work_struct *work) 421 { 422 struct ht16k33_priv *priv = ht16k33_work_to_priv(work); 423 struct linedisp_map *map = priv->linedisp.map; 424 char *s = priv->linedisp.buf; 425 uint8_t buf[8]; 426 427 put_unaligned_le16(map_to_seg14(&map->map.seg14, *s++), buf + 0); 428 put_unaligned_le16(map_to_seg14(&map->map.seg14, *s++), buf + 2); 429 put_unaligned_le16(map_to_seg14(&map->map.seg14, *s++), buf + 4); 430 put_unaligned_le16(map_to_seg14(&map->map.seg14, *s++), buf + 6); 431 432 i2c_smbus_write_i2c_block_data(priv->client, 0, ARRAY_SIZE(buf), buf); 433 } 434 435 static int ht16k33_linedisp_get_map_type(struct linedisp *linedisp) 436 { 437 struct ht16k33_priv *priv = ht16k33_linedisp_to_priv(linedisp); 438 439 switch (priv->type) { 440 case DISP_QUAD_7SEG: 441 INIT_DELAYED_WORK(&priv->work, ht16k33_seg7_update); 442 return LINEDISP_MAP_SEG7; 443 444 case DISP_QUAD_14SEG: 445 INIT_DELAYED_WORK(&priv->work, ht16k33_seg14_update); 446 return LINEDISP_MAP_SEG14; 447 448 default: 449 return -EINVAL; 450 } 451 } 452 453 static void ht16k33_linedisp_update(struct linedisp *linedisp) 454 { 455 struct ht16k33_priv *priv = ht16k33_linedisp_to_priv(linedisp); 456 457 schedule_delayed_work(&priv->work, 0); 458 } 459 460 static const struct linedisp_ops ht16k33_linedisp_ops = { 461 .get_map_type = ht16k33_linedisp_get_map_type, 462 .update = ht16k33_linedisp_update, 463 }; 464 465 static int ht16k33_led_probe(struct device *dev, struct led_classdev *led, 466 unsigned int brightness) 467 { 468 struct led_init_data init_data = {}; 469 int err; 470 471 /* The LED is optional */ 472 init_data.fwnode = device_get_named_child_node(dev, "led"); 473 if (!init_data.fwnode) 474 return 0; 475 476 init_data.devicename = "auxdisplay"; 477 init_data.devname_mandatory = true; 478 479 led->brightness_set_blocking = ht16k33_brightness_set_blocking; 480 led->blink_set = ht16k33_blink_set; 481 led->flags = LED_CORE_SUSPENDRESUME; 482 led->brightness = brightness; 483 led->max_brightness = MAX_BRIGHTNESS; 484 485 err = devm_led_classdev_register_ext(dev, led, &init_data); 486 if (err) 487 dev_err(dev, "Failed to register LED\n"); 488 489 return err; 490 } 491 492 static int ht16k33_keypad_probe(struct i2c_client *client, 493 struct ht16k33_keypad *keypad) 494 { 495 struct device *dev = &client->dev; 496 u32 rows = HT16K33_MATRIX_KEYPAD_MAX_ROWS; 497 u32 cols = HT16K33_MATRIX_KEYPAD_MAX_COLS; 498 int err; 499 500 keypad->client = client; 501 init_waitqueue_head(&keypad->wait); 502 503 keypad->dev = devm_input_allocate_device(dev); 504 if (!keypad->dev) 505 return -ENOMEM; 506 507 input_set_drvdata(keypad->dev, keypad); 508 509 keypad->dev->name = DRIVER_NAME"-keypad"; 510 keypad->dev->id.bustype = BUS_I2C; 511 keypad->dev->open = ht16k33_keypad_start; 512 keypad->dev->close = ht16k33_keypad_stop; 513 514 if (!device_property_read_bool(dev, "linux,no-autorepeat")) 515 __set_bit(EV_REP, keypad->dev->evbit); 516 517 err = device_property_read_u32(dev, "debounce-delay-ms", 518 &keypad->debounce_ms); 519 if (err) { 520 dev_err(dev, "key debounce delay not specified\n"); 521 return err; 522 } 523 524 err = matrix_keypad_parse_properties(dev, &rows, &cols); 525 if (err) 526 return err; 527 if (rows > HT16K33_MATRIX_KEYPAD_MAX_ROWS || 528 cols > HT16K33_MATRIX_KEYPAD_MAX_COLS) { 529 dev_err(dev, "%u rows or %u cols out of range in DT\n", rows, 530 cols); 531 return -ERANGE; 532 } 533 534 keypad->rows = rows; 535 keypad->cols = cols; 536 keypad->row_shift = get_count_order(cols); 537 538 err = matrix_keypad_build_keymap(NULL, NULL, rows, cols, NULL, 539 keypad->dev); 540 if (err) { 541 dev_err(dev, "failed to build keymap\n"); 542 return err; 543 } 544 545 err = devm_request_threaded_irq(dev, client->irq, NULL, 546 ht16k33_keypad_irq_thread, 547 IRQF_TRIGGER_HIGH | IRQF_ONESHOT, 548 DRIVER_NAME, keypad); 549 if (err) { 550 dev_err(dev, "irq request failed %d, error %d\n", client->irq, 551 err); 552 return err; 553 } 554 555 ht16k33_keypad_stop(keypad->dev); 556 557 return input_register_device(keypad->dev); 558 } 559 560 static int ht16k33_fbdev_probe(struct device *dev, struct ht16k33_priv *priv, 561 uint32_t brightness) 562 { 563 struct ht16k33_fbdev *fbdev = &priv->fbdev; 564 struct backlight_device *bl = NULL; 565 int err; 566 567 if (priv->led.dev) { 568 err = ht16k33_brightness_set(priv, brightness); 569 if (err) 570 return err; 571 } else { 572 /* backwards compatibility with DT lacking an led subnode */ 573 struct backlight_properties bl_props; 574 575 memset(&bl_props, 0, sizeof(struct backlight_properties)); 576 bl_props.type = BACKLIGHT_RAW; 577 bl_props.max_brightness = MAX_BRIGHTNESS; 578 579 bl = devm_backlight_device_register(dev, DRIVER_NAME"-bl", dev, 580 priv, &ht16k33_bl_ops, 581 &bl_props); 582 if (IS_ERR(bl)) { 583 dev_err(dev, "failed to register backlight\n"); 584 return PTR_ERR(bl); 585 } 586 587 bl->props.brightness = brightness; 588 ht16k33_bl_update_status(bl); 589 } 590 591 /* Framebuffer (2 bytes per column) */ 592 BUILD_BUG_ON(PAGE_SIZE < HT16K33_FB_SIZE); 593 fbdev->buffer = (unsigned char *) get_zeroed_page(GFP_KERNEL); 594 if (!fbdev->buffer) 595 return -ENOMEM; 596 597 fbdev->cache = devm_kmalloc(dev, HT16K33_FB_SIZE, GFP_KERNEL); 598 if (!fbdev->cache) { 599 err = -ENOMEM; 600 goto err_fbdev_buffer; 601 } 602 603 fbdev->info = framebuffer_alloc(0, dev); 604 if (!fbdev->info) { 605 err = -ENOMEM; 606 goto err_fbdev_buffer; 607 } 608 609 err = device_property_read_u32(dev, "refresh-rate-hz", 610 &fbdev->refresh_rate); 611 if (err) { 612 dev_err(dev, "refresh rate not specified\n"); 613 goto err_fbdev_info; 614 } 615 fb_bl_default_curve(fbdev->info, 0, MIN_BRIGHTNESS, MAX_BRIGHTNESS); 616 617 INIT_DELAYED_WORK(&priv->work, ht16k33_fb_update); 618 fbdev->info->fbops = &ht16k33_fb_ops; 619 fbdev->info->flags |= FBINFO_VIRTFB; 620 fbdev->info->screen_buffer = fbdev->buffer; 621 fbdev->info->screen_size = HT16K33_FB_SIZE; 622 fbdev->info->fix = ht16k33_fb_fix; 623 fbdev->info->var = ht16k33_fb_var; 624 fbdev->info->bl_dev = bl; 625 fbdev->info->pseudo_palette = NULL; 626 fbdev->info->par = priv; 627 628 err = register_framebuffer(fbdev->info); 629 if (err) 630 goto err_fbdev_info; 631 632 ht16k33_fb_queue(priv); 633 return 0; 634 635 err_fbdev_info: 636 framebuffer_release(fbdev->info); 637 err_fbdev_buffer: 638 free_page((unsigned long) fbdev->buffer); 639 640 return err; 641 } 642 643 static int ht16k33_seg_probe(struct device *dev, struct ht16k33_priv *priv, 644 uint32_t brightness) 645 { 646 struct linedisp *linedisp = &priv->linedisp; 647 int err; 648 649 err = ht16k33_brightness_set(priv, brightness); 650 if (err) 651 return err; 652 653 return linedisp_register(linedisp, dev, 4, &ht16k33_linedisp_ops); 654 } 655 656 static int ht16k33_probe(struct i2c_client *client) 657 { 658 struct device *dev = &client->dev; 659 const struct of_device_id *id; 660 struct ht16k33_priv *priv; 661 uint32_t dft_brightness; 662 int err; 663 664 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { 665 dev_err(dev, "i2c_check_functionality error\n"); 666 return -EIO; 667 } 668 669 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 670 if (!priv) 671 return -ENOMEM; 672 673 priv->client = client; 674 id = i2c_of_match_device(dev->driver->of_match_table, client); 675 if (id) 676 priv->type = (uintptr_t)id->data; 677 i2c_set_clientdata(client, priv); 678 679 err = ht16k33_initialize(priv); 680 if (err) 681 return err; 682 683 err = device_property_read_u32(dev, "default-brightness-level", 684 &dft_brightness); 685 if (err) { 686 dft_brightness = MAX_BRIGHTNESS; 687 } else if (dft_brightness > MAX_BRIGHTNESS) { 688 dev_warn(dev, 689 "invalid default brightness level: %u, using %u\n", 690 dft_brightness, MAX_BRIGHTNESS); 691 dft_brightness = MAX_BRIGHTNESS; 692 } 693 694 /* LED */ 695 err = ht16k33_led_probe(dev, &priv->led, dft_brightness); 696 if (err) 697 return err; 698 699 /* Keypad */ 700 if (client->irq > 0) { 701 err = ht16k33_keypad_probe(client, &priv->keypad); 702 if (err) 703 return err; 704 } 705 706 switch (priv->type) { 707 case DISP_MATRIX: 708 /* Frame Buffer Display */ 709 err = ht16k33_fbdev_probe(dev, priv, dft_brightness); 710 break; 711 712 case DISP_QUAD_7SEG: 713 case DISP_QUAD_14SEG: 714 /* Segment Display */ 715 err = ht16k33_seg_probe(dev, priv, dft_brightness); 716 break; 717 718 default: 719 return -EINVAL; 720 } 721 return err; 722 } 723 724 static void ht16k33_remove(struct i2c_client *client) 725 { 726 struct ht16k33_priv *priv = i2c_get_clientdata(client); 727 struct ht16k33_fbdev *fbdev = &priv->fbdev; 728 729 cancel_delayed_work_sync(&priv->work); 730 731 switch (priv->type) { 732 case DISP_MATRIX: 733 unregister_framebuffer(fbdev->info); 734 framebuffer_release(fbdev->info); 735 free_page((unsigned long)fbdev->buffer); 736 break; 737 738 case DISP_QUAD_7SEG: 739 case DISP_QUAD_14SEG: 740 linedisp_unregister(&priv->linedisp); 741 break; 742 743 default: 744 break; 745 } 746 } 747 748 static const struct i2c_device_id ht16k33_i2c_match[] = { 749 { "ht16k33", 0 }, 750 { } 751 }; 752 MODULE_DEVICE_TABLE(i2c, ht16k33_i2c_match); 753 754 static const struct of_device_id ht16k33_of_match[] = { 755 { 756 /* 0.56" 4-Digit 7-Segment FeatherWing Display (Red) */ 757 .compatible = "adafruit,3108", .data = (void *)DISP_QUAD_7SEG, 758 }, { 759 /* 0.54" Quad Alphanumeric FeatherWing Display (Red) */ 760 .compatible = "adafruit,3130", .data = (void *)DISP_QUAD_14SEG, 761 }, { 762 /* Generic, assumed Dot-Matrix Display */ 763 .compatible = "holtek,ht16k33", .data = (void *)DISP_MATRIX, 764 }, 765 { } 766 }; 767 MODULE_DEVICE_TABLE(of, ht16k33_of_match); 768 769 static struct i2c_driver ht16k33_driver = { 770 .probe = ht16k33_probe, 771 .remove = ht16k33_remove, 772 .driver = { 773 .name = DRIVER_NAME, 774 .of_match_table = ht16k33_of_match, 775 }, 776 .id_table = ht16k33_i2c_match, 777 }; 778 module_i2c_driver(ht16k33_driver); 779 780 MODULE_DESCRIPTION("Holtek HT16K33 driver"); 781 MODULE_LICENSE("GPL"); 782 MODULE_IMPORT_NS(LINEDISP); 783 MODULE_AUTHOR("Robin van der Gracht <robin@protonic.nl>"); 784