drivers/video/backlight/hx8357.c

   1 /*
   2  * Driver for the Himax HX-8357 LCD Controller
   3  *
   4  * Copyright 2012 Free Electrons
   5  *
   6  * Licensed under the GPLv2 or later.
   7  */
   8
   9 #include <linux/delay.h>
  10 #include <linux/lcd.h>
  11 #include <linux/module.h>
  12 #include <linux/of.h>
  13 #include <linux/of_device.h>
  14 #include <linux/of_gpio.h>
  15 #include <linux/spi/spi.h>
  16
  17 #define HX8357_NUM_IM_PINS      3
  18
  19 #define HX8357_SWRESET                  0x01
  20 #define HX8357_GET_RED_CHANNEL          0x06
  21 #define HX8357_GET_GREEN_CHANNEL        0x07
  22 #define HX8357_GET_BLUE_CHANNEL         0x08
  23 #define HX8357_GET_POWER_MODE           0x0a
  24 #define HX8357_GET_MADCTL               0x0b
  25 #define HX8357_GET_PIXEL_FORMAT         0x0c
  26 #define HX8357_GET_DISPLAY_MODE         0x0d
  27 #define HX8357_GET_SIGNAL_MODE          0x0e
  28 #define HX8357_GET_DIAGNOSTIC_RESULT    0x0f
  29 #define HX8357_ENTER_SLEEP_MODE         0x10
  30 #define HX8357_EXIT_SLEEP_MODE          0x11
  31 #define HX8357_ENTER_PARTIAL_MODE       0x12
  32 #define HX8357_ENTER_NORMAL_MODE        0x13
  33 #define HX8357_EXIT_INVERSION_MODE      0x20
  34 #define HX8357_ENTER_INVERSION_MODE     0x21
  35 #define HX8357_SET_DISPLAY_OFF          0x28
  36 #define HX8357_SET_DISPLAY_ON           0x29
  37 #define HX8357_SET_COLUMN_ADDRESS       0x2a
  38 #define HX8357_SET_PAGE_ADDRESS         0x2b
  39 #define HX8357_WRITE_MEMORY_START       0x2c
  40 #define HX8357_READ_MEMORY_START        0x2e
  41 #define HX8357_SET_PARTIAL_AREA         0x30
  42 #define HX8357_SET_SCROLL_AREA          0x33
  43 #define HX8357_SET_TEAR_OFF             0x34
  44 #define HX8357_SET_TEAR_ON              0x35
  45 #define HX8357_SET_ADDRESS_MODE         0x36
  46 #define HX8357_SET_SCROLL_START         0x37
  47 #define HX8357_EXIT_IDLE_MODE           0x38
  48 #define HX8357_ENTER_IDLE_MODE          0x39
  49 #define HX8357_SET_PIXEL_FORMAT         0x3a
  50 #define HX8357_SET_PIXEL_FORMAT_DBI_3BIT        (0x1)
  51 #define HX8357_SET_PIXEL_FORMAT_DBI_16BIT       (0x5)
  52 #define HX8357_SET_PIXEL_FORMAT_DBI_18BIT       (0x6)
  53 #define HX8357_SET_PIXEL_FORMAT_DPI_3BIT        (0x1 << 4)
  54 #define HX8357_SET_PIXEL_FORMAT_DPI_16BIT       (0x5 << 4)
  55 #define HX8357_SET_PIXEL_FORMAT_DPI_18BIT       (0x6 << 4)
  56 #define HX8357_WRITE_MEMORY_CONTINUE    0x3c
  57 #define HX8357_READ_MEMORY_CONTINUE     0x3e
  58 #define HX8357_SET_TEAR_SCAN_LINES      0x44
  59 #define HX8357_GET_SCAN_LINES           0x45
  60 #define HX8357_READ_DDB_START           0xa1
  61 #define HX8357_SET_DISPLAY_MODE         0xb4
  62 #define HX8357_SET_DISPLAY_MODE_RGB_THROUGH     (0x3)
  63 #define HX8357_SET_DISPLAY_MODE_RGB_INTERFACE   (1 << 4)
  64 #define HX8357_SET_PANEL_DRIVING        0xc0
  65 #define HX8357_SET_DISPLAY_FRAME        0xc5
  66 #define HX8357_SET_RGB                  0xc6
  67 #define HX8357_SET_RGB_ENABLE_HIGH              (1 << 1)
  68 #define HX8357_SET_GAMMA                0xc8
  69 #define HX8357_SET_POWER                0xd0
  70 #define HX8357_SET_VCOM                 0xd1
  71 #define HX8357_SET_POWER_NORMAL         0xd2
  72 #define HX8357_SET_PANEL_RELATED        0xe9
  73
  74 struct hx8357_data {
  75         unsigned                im_pins[HX8357_NUM_IM_PINS];
  76         unsigned                reset;
  77         struct spi_device       *spi;
  78         int                     state;
  79 };
  80
  81 static u8 hx8357_seq_power[] = {
  82         HX8357_SET_POWER, 0x44, 0x41, 0x06,
  83 };
  84
  85 static u8 hx8357_seq_vcom[] = {
  86         HX8357_SET_VCOM, 0x40, 0x10,
  87 };
  88
  89 static u8 hx8357_seq_power_normal[] = {
  90         HX8357_SET_POWER_NORMAL, 0x05, 0x12,
  91 };
  92
  93 static u8 hx8357_seq_panel_driving[] = {
  94         HX8357_SET_PANEL_DRIVING, 0x14, 0x3b, 0x00, 0x02, 0x11,
  95 };
  96
  97 static u8 hx8357_seq_display_frame[] = {
  98         HX8357_SET_DISPLAY_FRAME, 0x0c,
  99 };
 100
 101 static u8 hx8357_seq_panel_related[] = {
 102         HX8357_SET_PANEL_RELATED, 0x01,
 103 };
 104
 105 static u8 hx8357_seq_undefined1[] = {
 106         0xea, 0x03, 0x00, 0x00,
 107 };
 108
 109 static u8 hx8357_seq_undefined2[] = {
 110         0xeb, 0x40, 0x54, 0x26, 0xdb,
 111 };
 112
 113 static u8 hx8357_seq_gamma[] = {
 114         HX8357_SET_GAMMA, 0x00, 0x15, 0x00, 0x22, 0x00,
 115         0x08, 0x77, 0x26, 0x77, 0x22, 0x04, 0x00,
 116 };
 117
 118 static u8 hx8357_seq_address_mode[] = {
 119         HX8357_SET_ADDRESS_MODE, 0xc0,
 120 };
 121
 122 static u8 hx8357_seq_pixel_format[] = {
 123         HX8357_SET_PIXEL_FORMAT,
 124         HX8357_SET_PIXEL_FORMAT_DPI_18BIT |
 125         HX8357_SET_PIXEL_FORMAT_DBI_18BIT,
 126 };
 127
 128 static u8 hx8357_seq_column_address[] = {
 129         HX8357_SET_COLUMN_ADDRESS, 0x00, 0x00, 0x01, 0x3f,
 130 };
 131
 132 static u8 hx8357_seq_page_address[] = {
 133         HX8357_SET_PAGE_ADDRESS, 0x00, 0x00, 0x01, 0xdf,
 134 };
 135
 136 static u8 hx8357_seq_rgb[] = {
 137         HX8357_SET_RGB, 0x02,
 138 };
 139
 140 static u8 hx8357_seq_display_mode[] = {
 141         HX8357_SET_DISPLAY_MODE,
 142         HX8357_SET_DISPLAY_MODE_RGB_THROUGH |
 143         HX8357_SET_DISPLAY_MODE_RGB_INTERFACE,
 144 };
 145
 146 static int hx8357_spi_write_then_read(struct lcd_device *lcdev,
 147                                 u8 *txbuf, u16 txlen,
 148                                 u8 *rxbuf, u16 rxlen)
 149 {
 150         struct hx8357_data *lcd = lcd_get_data(lcdev);
 151         struct spi_message msg;
 152         struct spi_transfer xfer[2];
 153         u16 *local_txbuf = NULL;
 154         int ret = 0;
 155
 156         memset(xfer, 0, sizeof(xfer));
 157         spi_message_init(&msg);
 158
 159         if (txlen) {
 160                 int i;
 161
 162                 local_txbuf = kcalloc(txlen, sizeof(*local_txbuf), GFP_KERNEL);
 163
 164                 if (!local_txbuf)
 165                         return -ENOMEM;
 166
 167                 for (i = 0; i < txlen; i++) {
 168                         local_txbuf[i] = txbuf[i];
 169                         if (i > 0)
 170                                 local_txbuf[i] |= 1 << 8;
 171                 }
 172
 173                 xfer[0].len = 2 * txlen;
 174                 xfer[0].bits_per_word = 9;
 175                 xfer[0].tx_buf = local_txbuf;
 176                 spi_message_add_tail(&xfer[0], &msg);
 177         }
 178
 179         if (rxlen) {
 180                 xfer[1].len = rxlen;
 181                 xfer[1].bits_per_word = 8;
 182                 xfer[1].rx_buf = rxbuf;
 183                 spi_message_add_tail(&xfer[1], &msg);
 184         }
 185
 186         ret = spi_sync(lcd->spi, &msg);
 187         if (ret < 0)
 188                 dev_err(&lcdev->dev, "Couldn't send SPI data\n");
 189
 190         if (txlen)
 191                 kfree(local_txbuf);
 192
 193         return ret;
 194 }
 195
 196 static inline int hx8357_spi_write_array(struct lcd_device *lcdev,
 197                                         u8 *value, u8 len)
 198 {
 199         return hx8357_spi_write_then_read(lcdev, value, len, NULL, 0);
 200 }
 201
 202 static inline int hx8357_spi_write_byte(struct lcd_device *lcdev,
 203                                         u8 value)
 204 {
 205         return hx8357_spi_write_then_read(lcdev, &value, 1, NULL, 0);
 206 }
 207
 208 static int hx8357_enter_standby(struct lcd_device *lcdev)
 209 {
 210         int ret;
 211
 212         ret = hx8357_spi_write_byte(lcdev, HX8357_SET_DISPLAY_OFF);
 213         if (ret < 0)
 214                 return ret;
 215
 216         usleep_range(10000, 12000);
 217
 218         ret = hx8357_spi_write_byte(lcdev, HX8357_ENTER_SLEEP_MODE);
 219         if (ret < 0)
 220                 return ret;
 221
 222         msleep(120);
 223
 224         return 0;
 225 }
 226
 227 static int hx8357_exit_standby(struct lcd_device *lcdev)
 228 {
 229         int ret;
 230
 231         ret = hx8357_spi_write_byte(lcdev, HX8357_EXIT_SLEEP_MODE);
 232         if (ret < 0)
 233                 return ret;
 234
 235         msleep(120);
 236
 237         ret = hx8357_spi_write_byte(lcdev, HX8357_SET_DISPLAY_ON);
 238         if (ret < 0)
 239                 return ret;
 240
 241         return 0;
 242 }
 243
 244 static int hx8357_lcd_init(struct lcd_device *lcdev)
 245 {
 246         struct hx8357_data *lcd = lcd_get_data(lcdev);
 247         int ret;
 248
 249         /*
 250          * Set the interface selection pins to SPI mode, with three
 251          * wires
 252          */
 253         gpio_set_value_cansleep(lcd->im_pins[0], 1);
 254         gpio_set_value_cansleep(lcd->im_pins[1], 0);
 255         gpio_set_value_cansleep(lcd->im_pins[2], 1);
 256
 257         /* Reset the screen */
 258         gpio_set_value(lcd->reset, 1);
 259         usleep_range(10000, 12000);
 260         gpio_set_value(lcd->reset, 0);
 261         usleep_range(10000, 12000);
 262         gpio_set_value(lcd->reset, 1);
 263         msleep(120);
 264
 265         ret = hx8357_spi_write_array(lcdev, hx8357_seq_power,
 266                                 ARRAY_SIZE(hx8357_seq_power));
 267         if (ret < 0)
 268                 return ret;
 269
 270         ret = hx8357_spi_write_array(lcdev, hx8357_seq_vcom,
 271                                 ARRAY_SIZE(hx8357_seq_vcom));
 272         if (ret < 0)
 273                 return ret;
 274
 275         ret = hx8357_spi_write_array(lcdev, hx8357_seq_power_normal,
 276                                 ARRAY_SIZE(hx8357_seq_power_normal));
 277         if (ret < 0)
 278                 return ret;
 279
 280         ret = hx8357_spi_write_array(lcdev, hx8357_seq_panel_driving,
 281                                 ARRAY_SIZE(hx8357_seq_panel_driving));
 282         if (ret < 0)
 283                 return ret;
 284
 285         ret = hx8357_spi_write_array(lcdev, hx8357_seq_display_frame,
 286                                 ARRAY_SIZE(hx8357_seq_display_frame));
 287         if (ret < 0)
 288                 return ret;
 289
 290         ret = hx8357_spi_write_array(lcdev, hx8357_seq_panel_related,
 291                                 ARRAY_SIZE(hx8357_seq_panel_related));
 292         if (ret < 0)
 293                 return ret;
 294
 295         ret = hx8357_spi_write_array(lcdev, hx8357_seq_undefined1,
 296                                 ARRAY_SIZE(hx8357_seq_undefined1));
 297         if (ret < 0)
 298                 return ret;
 299
 300         ret = hx8357_spi_write_array(lcdev, hx8357_seq_undefined2,
 301                                 ARRAY_SIZE(hx8357_seq_undefined2));
 302         if (ret < 0)
 303                 return ret;
 304
 305         ret = hx8357_spi_write_array(lcdev, hx8357_seq_gamma,
 306                                 ARRAY_SIZE(hx8357_seq_gamma));
 307         if (ret < 0)
 308                 return ret;
 309
 310         ret = hx8357_spi_write_array(lcdev, hx8357_seq_address_mode,
 311                                 ARRAY_SIZE(hx8357_seq_address_mode));
 312         if (ret < 0)
 313                 return ret;
 314
 315         ret = hx8357_spi_write_array(lcdev, hx8357_seq_pixel_format,
 316                                 ARRAY_SIZE(hx8357_seq_pixel_format));
 317         if (ret < 0)
 318                 return ret;
 319
 320         ret = hx8357_spi_write_array(lcdev, hx8357_seq_column_address,
 321                                 ARRAY_SIZE(hx8357_seq_column_address));
 322         if (ret < 0)
 323                 return ret;
 324
 325         ret = hx8357_spi_write_array(lcdev, hx8357_seq_page_address,
 326                                 ARRAY_SIZE(hx8357_seq_page_address));
 327         if (ret < 0)
 328                 return ret;
 329
 330         ret = hx8357_spi_write_array(lcdev, hx8357_seq_rgb,
 331                                 ARRAY_SIZE(hx8357_seq_rgb));
 332         if (ret < 0)
 333                 return ret;
 334
 335         ret = hx8357_spi_write_array(lcdev, hx8357_seq_display_mode,
 336                                 ARRAY_SIZE(hx8357_seq_display_mode));
 337         if (ret < 0)
 338                 return ret;
 339
 340         ret = hx8357_spi_write_byte(lcdev, HX8357_EXIT_SLEEP_MODE);
 341         if (ret < 0)
 342                 return ret;
 343
 344         msleep(120);
 345
 346         ret = hx8357_spi_write_byte(lcdev, HX8357_SET_DISPLAY_ON);
 347         if (ret < 0)
 348                 return ret;
 349
 350         usleep_range(5000, 7000);
 351
 352         ret = hx8357_spi_write_byte(lcdev, HX8357_WRITE_MEMORY_START);
 353         if (ret < 0)
 354                 return ret;
 355
 356         return 0;
 357 }
 358
 359 #define POWER_IS_ON(pwr)        ((pwr) <= FB_BLANK_NORMAL)
 360
 361 static int hx8357_set_power(struct lcd_device *lcdev, int power)
 362 {
 363         struct hx8357_data *lcd = lcd_get_data(lcdev);
 364         int ret = 0;
 365
 366         if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->state))
 367                 ret = hx8357_exit_standby(lcdev);
 368         else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->state))
 369                 ret = hx8357_enter_standby(lcdev);
 370
 371         if (ret == 0)
 372                 lcd->state = power;
 373         else
 374                 dev_warn(&lcdev->dev, "failed to set power mode %d\n", power);
 375
 376         return ret;
 377 }
 378
 379 static int hx8357_get_power(struct lcd_device *lcdev)
 380 {
 381         struct hx8357_data *lcd = lcd_get_data(lcdev);
 382
 383         return lcd->state;
 384 }
 385
 386 static struct lcd_ops hx8357_ops = {
 387         .set_power      = hx8357_set_power,
 388         .get_power      = hx8357_get_power,
 389 };
 390
 391 static int hx8357_probe(struct spi_device *spi)
 392 {
 393         struct lcd_device *lcdev;
 394         struct hx8357_data *lcd;
 395         int i, ret;
 396
 397         lcd = devm_kzalloc(&spi->dev, sizeof(*lcd), GFP_KERNEL);
 398         if (!lcd) {
 399                 dev_err(&spi->dev, "Couldn't allocate lcd internal structure!\n");
 400                 return -ENOMEM;
 401         }
 402
 403         ret = spi_setup(spi);
 404         if (ret < 0) {
 405                 dev_err(&spi->dev, "SPI setup failed.\n");
 406                 return ret;
 407         }
 408
 409         lcd->spi = spi;
 410
 411         lcd->reset = of_get_named_gpio(spi->dev.of_node, "gpios-reset", 0);
 412         if (!gpio_is_valid(lcd->reset)) {
 413                 dev_err(&spi->dev, "Missing dt property: gpios-reset\n");
 414                 return -EINVAL;
 415         }
 416
 417         ret = devm_gpio_request_one(&spi->dev, lcd->reset,
 418                                     GPIOF_OUT_INIT_HIGH,
 419                                     "hx8357-reset");
 420         if (ret) {
 421                 dev_err(&spi->dev,
 422                         "failed to request gpio %d: %d\n",
 423                         lcd->reset, ret);
 424                 return -EINVAL;
 425         }
 426
 427         for (i = 0; i < HX8357_NUM_IM_PINS; i++) {
 428                 lcd->im_pins[i] = of_get_named_gpio(spi->dev.of_node,
 429                                                 "im-gpios", i);
 430                 if (lcd->im_pins[i] == -EPROBE_DEFER) {
 431                         dev_info(&spi->dev, "GPIO requested is not here yet, deferring the probe\n");
 432                         return -EPROBE_DEFER;
 433                 }
 434                 if (!gpio_is_valid(lcd->im_pins[i])) {
 435                         dev_err(&spi->dev, "Missing dt property: im-gpios\n");
 436                         return -EINVAL;
 437                 }
 438
 439                 ret = devm_gpio_request_one(&spi->dev, lcd->im_pins[i],
 440                                         GPIOF_OUT_INIT_LOW, "im_pins");
 441                 if (ret) {
 442                         dev_err(&spi->dev, "failed to request gpio %d: %d\n",
 443                                 lcd->im_pins[i], ret);
 444                         return -EINVAL;
 445                 }
 446         }
 447
 448         lcdev = lcd_device_register("mxsfb", &spi->dev, lcd, &hx8357_ops);
 449         if (IS_ERR(lcdev)) {
 450                 ret = PTR_ERR(lcdev);
 451                 return ret;
 452         }
 453         spi_set_drvdata(spi, lcdev);
 454
 455         ret = hx8357_lcd_init(lcdev);
 456         if (ret) {
 457                 dev_err(&spi->dev, "Couldn't initialize panel\n");
 458                 goto init_error;
 459         }
 460
 461         dev_info(&spi->dev, "Panel probed\n");
 462
 463         return 0;
 464
 465 init_error:
 466         lcd_device_unregister(lcdev);
 467         return ret;
 468 }
 469
 470 static int hx8357_remove(struct spi_device *spi)
 471 {
 472         struct lcd_device *lcdev = spi_get_drvdata(spi);
 473
 474         lcd_device_unregister(lcdev);
 475         return 0;
 476 }
 477
 478 static const struct of_device_id hx8357_dt_ids[] = {
 479         { .compatible = "himax,hx8357" },
 480         {},
 481 };
 482 MODULE_DEVICE_TABLE(of, hx8357_dt_ids);
 483
 484 static struct spi_driver hx8357_driver = {
 485         .probe  = hx8357_probe,
 486         .remove = hx8357_remove,
 487         .driver = {
 488                 .name = "hx8357",
 489                 .of_match_table = of_match_ptr(hx8357_dt_ids),
 490         },
 491 };
 492
 493 module_spi_driver(hx8357_driver);
 494
 495 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
 496 MODULE_DESCRIPTION("Himax HX-8357 LCD Driver");
 497 MODULE_LICENSE("GPL");