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 <linux/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 fwnode_handle_put(init_data.fwnode); 487 if (err) 488 dev_err(dev, "Failed to register LED\n"); 489 490 return err; 491 } 492 493 static int ht16k33_keypad_probe(struct i2c_client *client, 494 struct ht16k33_keypad *keypad) 495 { 496 struct device *dev = &client->dev; 497 u32 rows = HT16K33_MATRIX_KEYPAD_MAX_ROWS; 498 u32 cols = HT16K33_MATRIX_KEYPAD_MAX_COLS; 499 int err; 500 501 keypad->client = client; 502 init_waitqueue_head(&keypad->wait); 503 504 keypad->dev = devm_input_allocate_device(dev); 505 if (!keypad->dev) 506 return -ENOMEM; 507 508 input_set_drvdata(keypad->dev, keypad); 509 510 keypad->dev->name = DRIVER_NAME"-keypad"; 511 keypad->dev->id.bustype = BUS_I2C; 512 keypad->dev->open = ht16k33_keypad_start; 513 keypad->dev->close = ht16k33_keypad_stop; 514 515 if (!device_property_read_bool(dev, "linux,no-autorepeat")) 516 __set_bit(EV_REP, keypad->dev->evbit); 517 518 err = device_property_read_u32(dev, "debounce-delay-ms", 519 &keypad->debounce_ms); 520 if (err) { 521 dev_err(dev, "key debounce delay not specified\n"); 522 return err; 523 } 524 525 err = matrix_keypad_parse_properties(dev, &rows, &cols); 526 if (err) 527 return err; 528 if (rows > HT16K33_MATRIX_KEYPAD_MAX_ROWS || 529 cols > HT16K33_MATRIX_KEYPAD_MAX_COLS) { 530 dev_err(dev, "%u rows or %u cols out of range in DT\n", rows, 531 cols); 532 return -ERANGE; 533 } 534 535 keypad->rows = rows; 536 keypad->cols = cols; 537 keypad->row_shift = get_count_order(cols); 538 539 err = matrix_keypad_build_keymap(NULL, NULL, rows, cols, NULL, 540 keypad->dev); 541 if (err) { 542 dev_err(dev, "failed to build keymap\n"); 543 return err; 544 } 545 546 err = devm_request_threaded_irq(dev, client->irq, NULL, 547 ht16k33_keypad_irq_thread, 548 IRQF_TRIGGER_HIGH | IRQF_ONESHOT, 549 DRIVER_NAME, keypad); 550 if (err) 551 return err; 552 553 ht16k33_keypad_stop(keypad->dev); 554 555 return input_register_device(keypad->dev); 556 } 557 558 static int ht16k33_fbdev_probe(struct device *dev, struct ht16k33_priv *priv, 559 uint32_t brightness) 560 { 561 struct ht16k33_fbdev *fbdev = &priv->fbdev; 562 struct backlight_device *bl = NULL; 563 int err; 564 565 if (priv->led.dev) { 566 err = ht16k33_brightness_set(priv, brightness); 567 if (err) 568 return err; 569 } else { 570 /* backwards compatibility with DT lacking an led subnode */ 571 struct backlight_properties bl_props; 572 573 memset(&bl_props, 0, sizeof(struct backlight_properties)); 574 bl_props.type = BACKLIGHT_RAW; 575 bl_props.max_brightness = MAX_BRIGHTNESS; 576 577 bl = devm_backlight_device_register(dev, DRIVER_NAME"-bl", dev, 578 priv, &ht16k33_bl_ops, 579 &bl_props); 580 if (IS_ERR(bl)) { 581 dev_err(dev, "failed to register backlight\n"); 582 return PTR_ERR(bl); 583 } 584 585 bl->props.brightness = brightness; 586 ht16k33_bl_update_status(bl); 587 } 588 589 /* Framebuffer (2 bytes per column) */ 590 BUILD_BUG_ON(PAGE_SIZE < HT16K33_FB_SIZE); 591 fbdev->buffer = (unsigned char *) get_zeroed_page(GFP_KERNEL); 592 if (!fbdev->buffer) 593 return -ENOMEM; 594 595 fbdev->cache = devm_kmalloc(dev, HT16K33_FB_SIZE, GFP_KERNEL); 596 if (!fbdev->cache) { 597 err = -ENOMEM; 598 goto err_fbdev_buffer; 599 } 600 601 fbdev->info = framebuffer_alloc(0, dev); 602 if (!fbdev->info) { 603 err = -ENOMEM; 604 goto err_fbdev_buffer; 605 } 606 607 err = device_property_read_u32(dev, "refresh-rate-hz", 608 &fbdev->refresh_rate); 609 if (err) { 610 dev_err(dev, "refresh rate not specified\n"); 611 goto err_fbdev_info; 612 } 613 fb_bl_default_curve(fbdev->info, 0, MIN_BRIGHTNESS, MAX_BRIGHTNESS); 614 615 INIT_DELAYED_WORK(&priv->work, ht16k33_fb_update); 616 fbdev->info->fbops = &ht16k33_fb_ops; 617 fbdev->info->flags |= FBINFO_VIRTFB; 618 fbdev->info->screen_buffer = fbdev->buffer; 619 fbdev->info->screen_size = HT16K33_FB_SIZE; 620 fbdev->info->fix = ht16k33_fb_fix; 621 fbdev->info->var = ht16k33_fb_var; 622 fbdev->info->bl_dev = bl; 623 fbdev->info->pseudo_palette = NULL; 624 fbdev->info->par = priv; 625 626 err = register_framebuffer(fbdev->info); 627 if (err) 628 goto err_fbdev_info; 629 630 ht16k33_fb_queue(priv); 631 return 0; 632 633 err_fbdev_info: 634 framebuffer_release(fbdev->info); 635 err_fbdev_buffer: 636 free_page((unsigned long) fbdev->buffer); 637 638 return err; 639 } 640 641 static int ht16k33_seg_probe(struct device *dev, struct ht16k33_priv *priv, 642 uint32_t brightness) 643 { 644 struct linedisp *linedisp = &priv->linedisp; 645 int err; 646 647 err = ht16k33_brightness_set(priv, brightness); 648 if (err) 649 return err; 650 651 return linedisp_register(linedisp, dev, 4, &ht16k33_linedisp_ops); 652 } 653 654 static int ht16k33_probe(struct i2c_client *client) 655 { 656 struct device *dev = &client->dev; 657 struct ht16k33_priv *priv; 658 uint32_t dft_brightness; 659 int err; 660 661 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { 662 dev_err(dev, "i2c_check_functionality error\n"); 663 return -EIO; 664 } 665 666 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 667 if (!priv) 668 return -ENOMEM; 669 670 priv->client = client; 671 priv->type = (uintptr_t)i2c_get_match_data(client); 672 673 i2c_set_clientdata(client, priv); 674 675 err = ht16k33_initialize(priv); 676 if (err) 677 return err; 678 679 err = device_property_read_u32(dev, "default-brightness-level", 680 &dft_brightness); 681 if (err) { 682 dft_brightness = MAX_BRIGHTNESS; 683 } else if (dft_brightness > MAX_BRIGHTNESS) { 684 dev_warn(dev, 685 "invalid default brightness level: %u, using %u\n", 686 dft_brightness, MAX_BRIGHTNESS); 687 dft_brightness = MAX_BRIGHTNESS; 688 } 689 690 /* LED */ 691 err = ht16k33_led_probe(dev, &priv->led, dft_brightness); 692 if (err) 693 return err; 694 695 /* Keypad */ 696 if (client->irq > 0) { 697 err = ht16k33_keypad_probe(client, &priv->keypad); 698 if (err) 699 return err; 700 } 701 702 switch (priv->type) { 703 case DISP_MATRIX: 704 /* Frame Buffer Display */ 705 err = ht16k33_fbdev_probe(dev, priv, dft_brightness); 706 break; 707 708 case DISP_QUAD_7SEG: 709 case DISP_QUAD_14SEG: 710 /* Segment Display */ 711 err = ht16k33_seg_probe(dev, priv, dft_brightness); 712 break; 713 714 default: 715 return -EINVAL; 716 } 717 return err; 718 } 719 720 static void ht16k33_remove(struct i2c_client *client) 721 { 722 struct ht16k33_priv *priv = i2c_get_clientdata(client); 723 struct ht16k33_fbdev *fbdev = &priv->fbdev; 724 725 cancel_delayed_work_sync(&priv->work); 726 727 switch (priv->type) { 728 case DISP_MATRIX: 729 unregister_framebuffer(fbdev->info); 730 framebuffer_release(fbdev->info); 731 free_page((unsigned long)fbdev->buffer); 732 break; 733 734 case DISP_QUAD_7SEG: 735 case DISP_QUAD_14SEG: 736 linedisp_unregister(&priv->linedisp); 737 break; 738 739 default: 740 break; 741 } 742 } 743 744 static const struct i2c_device_id ht16k33_i2c_match[] = { 745 { "3108", DISP_QUAD_7SEG }, 746 { "3130", DISP_QUAD_14SEG }, 747 { "ht16k33", DISP_MATRIX }, 748 { } 749 }; 750 MODULE_DEVICE_TABLE(i2c, ht16k33_i2c_match); 751 752 static const struct of_device_id ht16k33_of_match[] = { 753 { 754 /* 0.56" 4-Digit 7-Segment FeatherWing Display (Red) */ 755 .compatible = "adafruit,3108", .data = (void *)DISP_QUAD_7SEG, 756 }, { 757 /* 0.54" Quad Alphanumeric FeatherWing Display (Red) */ 758 .compatible = "adafruit,3130", .data = (void *)DISP_QUAD_14SEG, 759 }, { 760 /* Generic, assumed Dot-Matrix Display */ 761 .compatible = "holtek,ht16k33", .data = (void *)DISP_MATRIX, 762 }, 763 { } 764 }; 765 MODULE_DEVICE_TABLE(of, ht16k33_of_match); 766 767 static struct i2c_driver ht16k33_driver = { 768 .probe = ht16k33_probe, 769 .remove = ht16k33_remove, 770 .driver = { 771 .name = DRIVER_NAME, 772 .of_match_table = ht16k33_of_match, 773 }, 774 .id_table = ht16k33_i2c_match, 775 }; 776 module_i2c_driver(ht16k33_driver); 777 778 MODULE_DESCRIPTION("Holtek HT16K33 driver"); 779 MODULE_LICENSE("GPL"); 780 MODULE_IMPORT_NS("LINEDISP"); 781 MODULE_AUTHOR("Robin van der Gracht <robin@protonic.nl>"); 782