drivers/video/backlight/corgi_lcd.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  LCD/Backlight Driver for Sharp Zaurus Handhelds (various models)
   4  *
   5  *  Copyright (c) 2004-2006 Richard Purdie
   6  *
   7  *  Based on Sharp's 2.4 Backlight Driver
   8  *
   9  *  Copyright (c) 2008 Marvell International Ltd.
  10  *      Converted to SPI device based LCD/Backlight device driver
  11  *      by Eric Miao <eric.miao@marvell.com>
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/delay.h>
  18 #include <linux/gpio.h>
  19 #include <linux/fb.h>
  20 #include <linux/lcd.h>
  21 #include <linux/spi/spi.h>
  22 #include <linux/spi/corgi_lcd.h>
  23 #include <linux/slab.h>
  24 #include <asm/mach/sharpsl_param.h>
  25
  26 #define POWER_IS_ON(pwr)        ((pwr) <= FB_BLANK_NORMAL)
  27
  28 /* Register Addresses */
  29 #define RESCTL_ADRS     0x00
  30 #define PHACTRL_ADRS    0x01
  31 #define DUTYCTRL_ADRS   0x02
  32 #define POWERREG0_ADRS  0x03
  33 #define POWERREG1_ADRS  0x04
  34 #define GPOR3_ADRS      0x05
  35 #define PICTRL_ADRS     0x06
  36 #define POLCTRL_ADRS    0x07
  37
  38 /* Register Bit Definitions */
  39 #define RESCTL_QVGA     0x01
  40 #define RESCTL_VGA      0x00
  41
  42 #define POWER1_VW_ON    0x01  /* VW Supply FET ON */
  43 #define POWER1_GVSS_ON  0x02  /* GVSS(-8V) Power Supply ON */
  44 #define POWER1_VDD_ON   0x04  /* VDD(8V),SVSS(-4V) Power Supply ON */
  45
  46 #define POWER1_VW_OFF   0x00  /* VW Supply FET OFF */
  47 #define POWER1_GVSS_OFF 0x00  /* GVSS(-8V) Power Supply OFF */
  48 #define POWER1_VDD_OFF  0x00  /* VDD(8V),SVSS(-4V) Power Supply OFF */
  49
  50 #define POWER0_COM_DCLK 0x01  /* COM Voltage DC Bias DAC Serial Data Clock */
  51 #define POWER0_COM_DOUT 0x02  /* COM Voltage DC Bias DAC Serial Data Out */
  52 #define POWER0_DAC_ON   0x04  /* DAC Power Supply ON */
  53 #define POWER0_COM_ON   0x08  /* COM Power Supply ON */
  54 #define POWER0_VCC5_ON  0x10  /* VCC5 Power Supply ON */
  55
  56 #define POWER0_DAC_OFF  0x00  /* DAC Power Supply OFF */
  57 #define POWER0_COM_OFF  0x00  /* COM Power Supply OFF */
  58 #define POWER0_VCC5_OFF 0x00  /* VCC5 Power Supply OFF */
  59
  60 #define PICTRL_INIT_STATE      0x01
  61 #define PICTRL_INIOFF          0x02
  62 #define PICTRL_POWER_DOWN      0x04
  63 #define PICTRL_COM_SIGNAL_OFF  0x08
  64 #define PICTRL_DAC_SIGNAL_OFF  0x10
  65
  66 #define POLCTRL_SYNC_POL_FALL  0x01
  67 #define POLCTRL_EN_POL_FALL    0x02
  68 #define POLCTRL_DATA_POL_FALL  0x04
  69 #define POLCTRL_SYNC_ACT_H     0x08
  70 #define POLCTRL_EN_ACT_L       0x10
  71
  72 #define POLCTRL_SYNC_POL_RISE  0x00
  73 #define POLCTRL_EN_POL_RISE    0x00
  74 #define POLCTRL_DATA_POL_RISE  0x00
  75 #define POLCTRL_SYNC_ACT_L     0x00
  76 #define POLCTRL_EN_ACT_H       0x00
  77
  78 #define PHACTRL_PHASE_MANUAL   0x01
  79 #define DEFAULT_PHAD_QVGA     (9)
  80 #define DEFAULT_COMADJ        (125)
  81
  82 struct corgi_lcd {
  83         struct spi_device       *spi_dev;
  84         struct lcd_device       *lcd_dev;
  85         struct backlight_device *bl_dev;
  86
  87         int     limit_mask;
  88         int     intensity;
  89         int     power;
  90         int     mode;
  91         char    buf[2];
  92
  93         int     gpio_backlight_on;
  94         int     gpio_backlight_cont;
  95         int     gpio_backlight_cont_inverted;
  96
  97         void (*kick_battery)(void);
  98 };
  99
 100 static int corgi_ssp_lcdtg_send(struct corgi_lcd *lcd, int reg, uint8_t val);
 101
 102 static struct corgi_lcd *the_corgi_lcd;
 103 static unsigned long corgibl_flags;
 104 #define CORGIBL_SUSPENDED     0x01
 105 #define CORGIBL_BATTLOW       0x02
 106
 107 /*
 108  * This is only a pseudo I2C interface. We can't use the standard kernel
 109  * routines as the interface is write only. We just assume the data is acked...
 110  */
 111 static void lcdtg_ssp_i2c_send(struct corgi_lcd *lcd, uint8_t data)
 112 {
 113         corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, data);
 114         udelay(10);
 115 }
 116
 117 static void lcdtg_i2c_send_bit(struct corgi_lcd *lcd, uint8_t data)
 118 {
 119         lcdtg_ssp_i2c_send(lcd, data);
 120         lcdtg_ssp_i2c_send(lcd, data | POWER0_COM_DCLK);
 121         lcdtg_ssp_i2c_send(lcd, data);
 122 }
 123
 124 static void lcdtg_i2c_send_start(struct corgi_lcd *lcd, uint8_t base)
 125 {
 126         lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK | POWER0_COM_DOUT);
 127         lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK);
 128         lcdtg_ssp_i2c_send(lcd, base);
 129 }
 130
 131 static void lcdtg_i2c_send_stop(struct corgi_lcd *lcd, uint8_t base)
 132 {
 133         lcdtg_ssp_i2c_send(lcd, base);
 134         lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK);
 135         lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK | POWER0_COM_DOUT);
 136 }
 137
 138 static void lcdtg_i2c_send_byte(struct corgi_lcd *lcd,
 139                                 uint8_t base, uint8_t data)
 140 {
 141         int i;
 142
 143         for (i = 0; i < 8; i++) {
 144                 if (data & 0x80)
 145                         lcdtg_i2c_send_bit(lcd, base | POWER0_COM_DOUT);
 146                 else
 147                         lcdtg_i2c_send_bit(lcd, base);
 148                 data <<= 1;
 149         }
 150 }
 151
 152 static void lcdtg_i2c_wait_ack(struct corgi_lcd *lcd, uint8_t base)
 153 {
 154         lcdtg_i2c_send_bit(lcd, base);
 155 }
 156
 157 static void lcdtg_set_common_voltage(struct corgi_lcd *lcd,
 158                                      uint8_t base_data, uint8_t data)
 159 {
 160         /* Set Common Voltage to M62332FP via I2C */
 161         lcdtg_i2c_send_start(lcd, base_data);
 162         lcdtg_i2c_send_byte(lcd, base_data, 0x9c);
 163         lcdtg_i2c_wait_ack(lcd, base_data);
 164         lcdtg_i2c_send_byte(lcd, base_data, 0x00);
 165         lcdtg_i2c_wait_ack(lcd, base_data);
 166         lcdtg_i2c_send_byte(lcd, base_data, data);
 167         lcdtg_i2c_wait_ack(lcd, base_data);
 168         lcdtg_i2c_send_stop(lcd, base_data);
 169 }
 170
 171 static int corgi_ssp_lcdtg_send(struct corgi_lcd *lcd, int adrs, uint8_t data)
 172 {
 173         struct spi_message msg;
 174         struct spi_transfer xfer = {
 175                 .len            = 1,
 176                 .cs_change      = 0,
 177                 .tx_buf         = lcd->buf,
 178         };
 179
 180         lcd->buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f);
 181         spi_message_init(&msg);
 182         spi_message_add_tail(&xfer, &msg);
 183
 184         return spi_sync(lcd->spi_dev, &msg);
 185 }
 186
 187 /* Set Phase Adjust */
 188 static void lcdtg_set_phadadj(struct corgi_lcd *lcd, int mode)
 189 {
 190         int adj;
 191
 192         switch (mode) {
 193         case CORGI_LCD_MODE_VGA:
 194                 /* Setting for VGA */
 195                 adj = sharpsl_param.phadadj;
 196                 adj = (adj < 0) ? PHACTRL_PHASE_MANUAL :
 197                                   PHACTRL_PHASE_MANUAL | ((adj & 0xf) << 1);
 198                 break;
 199         case CORGI_LCD_MODE_QVGA:
 200         default:
 201                 /* Setting for QVGA */
 202                 adj = (DEFAULT_PHAD_QVGA << 1) | PHACTRL_PHASE_MANUAL;
 203                 break;
 204         }
 205
 206         corgi_ssp_lcdtg_send(lcd, PHACTRL_ADRS, adj);
 207 }
 208
 209 static void corgi_lcd_power_on(struct corgi_lcd *lcd)
 210 {
 211         int comadj;
 212
 213         /* Initialize Internal Logic & Port */
 214         corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
 215                         PICTRL_POWER_DOWN | PICTRL_INIOFF |
 216                         PICTRL_INIT_STATE | PICTRL_COM_SIGNAL_OFF |
 217                         PICTRL_DAC_SIGNAL_OFF);
 218
 219         corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
 220                         POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_OFF |
 221                         POWER0_COM_OFF | POWER0_VCC5_OFF);
 222
 223         corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
 224                         POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_OFF);
 225
 226         /* VDD(+8V), SVSS(-4V) ON */
 227         corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
 228                         POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_ON);
 229         mdelay(3);
 230
 231         /* DAC ON */
 232         corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
 233                         POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
 234                         POWER0_COM_OFF | POWER0_VCC5_OFF);
 235
 236         /* INIB = H, INI = L  */
 237         /* PICTL[0] = H , PICTL[1] = PICTL[2] = PICTL[4] = L */
 238         corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
 239                         PICTRL_INIT_STATE | PICTRL_COM_SIGNAL_OFF);
 240
 241         /* Set Common Voltage */
 242         comadj = sharpsl_param.comadj;
 243         if (comadj < 0)
 244                 comadj = DEFAULT_COMADJ;
 245
 246         lcdtg_set_common_voltage(lcd, POWER0_DAC_ON | POWER0_COM_OFF |
 247                                  POWER0_VCC5_OFF, comadj);
 248
 249         /* VCC5 ON, DAC ON */
 250         corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
 251                         POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
 252                         POWER0_COM_OFF | POWER0_VCC5_ON);
 253
 254         /* GVSS(-8V) ON, VDD ON */
 255         corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
 256                         POWER1_VW_OFF | POWER1_GVSS_ON | POWER1_VDD_ON);
 257         mdelay(2);
 258
 259         /* COM SIGNAL ON (PICTL[3] = L) */
 260         corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_INIT_STATE);
 261
 262         /* COM ON, DAC ON, VCC5_ON */
 263         corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
 264                         POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
 265                         POWER0_COM_ON | POWER0_VCC5_ON);
 266
 267         /* VW ON, GVSS ON, VDD ON */
 268         corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
 269                         POWER1_VW_ON | POWER1_GVSS_ON | POWER1_VDD_ON);
 270
 271         /* Signals output enable */
 272         corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, 0);
 273
 274         /* Set Phase Adjust */
 275         lcdtg_set_phadadj(lcd, lcd->mode);
 276
 277         /* Initialize for Input Signals from ATI */
 278         corgi_ssp_lcdtg_send(lcd, POLCTRL_ADRS,
 279                         POLCTRL_SYNC_POL_RISE | POLCTRL_EN_POL_RISE |
 280                         POLCTRL_DATA_POL_RISE | POLCTRL_SYNC_ACT_L |
 281                         POLCTRL_EN_ACT_H);
 282         udelay(1000);
 283
 284         switch (lcd->mode) {
 285         case CORGI_LCD_MODE_VGA:
 286                 corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA);
 287                 break;
 288         case CORGI_LCD_MODE_QVGA:
 289         default:
 290                 corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA);
 291                 break;
 292         }
 293 }
 294
 295 static void corgi_lcd_power_off(struct corgi_lcd *lcd)
 296 {
 297         /* 60Hz x 2 frame = 16.7msec x 2 = 33.4 msec */
 298         msleep(34);
 299
 300         /* (1)VW OFF */
 301         corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
 302                         POWER1_VW_OFF | POWER1_GVSS_ON | POWER1_VDD_ON);
 303
 304         /* (2)COM OFF */
 305         corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_COM_SIGNAL_OFF);
 306         corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
 307                         POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_ON);
 308
 309         /* (3)Set Common Voltage Bias 0V */
 310         lcdtg_set_common_voltage(lcd, POWER0_DAC_ON | POWER0_COM_OFF |
 311                         POWER0_VCC5_ON, 0);
 312
 313         /* (4)GVSS OFF */
 314         corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
 315                         POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_ON);
 316
 317         /* (5)VCC5 OFF */
 318         corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
 319                         POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_OFF);
 320
 321         /* (6)Set PDWN, INIOFF, DACOFF */
 322         corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
 323                         PICTRL_INIOFF | PICTRL_DAC_SIGNAL_OFF |
 324                         PICTRL_POWER_DOWN | PICTRL_COM_SIGNAL_OFF);
 325
 326         /* (7)DAC OFF */
 327         corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
 328                         POWER0_DAC_OFF | POWER0_COM_OFF | POWER0_VCC5_OFF);
 329
 330         /* (8)VDD OFF */
 331         corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
 332                         POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_OFF);
 333 }
 334
 335 static int corgi_lcd_set_mode(struct lcd_device *ld, struct fb_videomode *m)
 336 {
 337         struct corgi_lcd *lcd = lcd_get_data(ld);
 338         int mode = CORGI_LCD_MODE_QVGA;
 339
 340         if (m->xres == 640 || m->xres == 480)
 341                 mode = CORGI_LCD_MODE_VGA;
 342
 343         if (lcd->mode == mode)
 344                 return 0;
 345
 346         lcdtg_set_phadadj(lcd, mode);
 347
 348         switch (mode) {
 349         case CORGI_LCD_MODE_VGA:
 350                 corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA);
 351                 break;
 352         case CORGI_LCD_MODE_QVGA:
 353         default:
 354                 corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA);
 355                 break;
 356         }
 357
 358         lcd->mode = mode;
 359         return 0;
 360 }
 361
 362 static int corgi_lcd_set_power(struct lcd_device *ld, int power)
 363 {
 364         struct corgi_lcd *lcd = lcd_get_data(ld);
 365
 366         if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
 367                 corgi_lcd_power_on(lcd);
 368
 369         if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
 370                 corgi_lcd_power_off(lcd);
 371
 372         lcd->power = power;
 373         return 0;
 374 }
 375
 376 static int corgi_lcd_get_power(struct lcd_device *ld)
 377 {
 378         struct corgi_lcd *lcd = lcd_get_data(ld);
 379
 380         return lcd->power;
 381 }
 382
 383 static struct lcd_ops corgi_lcd_ops = {
 384         .get_power      = corgi_lcd_get_power,
 385         .set_power      = corgi_lcd_set_power,
 386         .set_mode       = corgi_lcd_set_mode,
 387 };
 388
 389 static int corgi_bl_get_intensity(struct backlight_device *bd)
 390 {
 391         struct corgi_lcd *lcd = bl_get_data(bd);
 392
 393         return lcd->intensity;
 394 }
 395
 396 static int corgi_bl_set_intensity(struct corgi_lcd *lcd, int intensity)
 397 {
 398         int cont;
 399
 400         if (intensity > 0x10)
 401                 intensity += 0x10;
 402
 403         corgi_ssp_lcdtg_send(lcd, DUTYCTRL_ADRS, intensity);
 404
 405         /* Bit 5 via GPIO_BACKLIGHT_CONT */
 406         cont = !!(intensity & 0x20) ^ lcd->gpio_backlight_cont_inverted;
 407
 408         if (gpio_is_valid(lcd->gpio_backlight_cont))
 409                 gpio_set_value_cansleep(lcd->gpio_backlight_cont, cont);
 410
 411         if (gpio_is_valid(lcd->gpio_backlight_on))
 412                 gpio_set_value_cansleep(lcd->gpio_backlight_on, intensity);
 413
 414         if (lcd->kick_battery)
 415                 lcd->kick_battery();
 416
 417         lcd->intensity = intensity;
 418         return 0;
 419 }
 420
 421 static int corgi_bl_update_status(struct backlight_device *bd)
 422 {
 423         struct corgi_lcd *lcd = bl_get_data(bd);
 424         int intensity = bd->props.brightness;
 425
 426         if (bd->props.power != FB_BLANK_UNBLANK)
 427                 intensity = 0;
 428
 429         if (bd->props.fb_blank != FB_BLANK_UNBLANK)
 430                 intensity = 0;
 431
 432         if (corgibl_flags & CORGIBL_SUSPENDED)
 433                 intensity = 0;
 434
 435         if ((corgibl_flags & CORGIBL_BATTLOW) && intensity > lcd->limit_mask)
 436                 intensity = lcd->limit_mask;
 437
 438         return corgi_bl_set_intensity(lcd, intensity);
 439 }
 440
 441 void corgi_lcd_limit_intensity(int limit)
 442 {
 443         if (limit)
 444                 corgibl_flags |= CORGIBL_BATTLOW;
 445         else
 446                 corgibl_flags &= ~CORGIBL_BATTLOW;
 447
 448         backlight_update_status(the_corgi_lcd->bl_dev);
 449 }
 450 EXPORT_SYMBOL(corgi_lcd_limit_intensity);
 451
 452 static const struct backlight_ops corgi_bl_ops = {
 453         .get_brightness = corgi_bl_get_intensity,
 454         .update_status  = corgi_bl_update_status,
 455 };
 456
 457 #ifdef CONFIG_PM_SLEEP
 458 static int corgi_lcd_suspend(struct device *dev)
 459 {
 460         struct corgi_lcd *lcd = dev_get_drvdata(dev);
 461
 462         corgibl_flags |= CORGIBL_SUSPENDED;
 463         corgi_bl_set_intensity(lcd, 0);
 464         corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN);
 465         return 0;
 466 }
 467
 468 static int corgi_lcd_resume(struct device *dev)
 469 {
 470         struct corgi_lcd *lcd = dev_get_drvdata(dev);
 471
 472         corgibl_flags &= ~CORGIBL_SUSPENDED;
 473         corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK);
 474         backlight_update_status(lcd->bl_dev);
 475         return 0;
 476 }
 477 #endif
 478
 479 static SIMPLE_DEV_PM_OPS(corgi_lcd_pm_ops, corgi_lcd_suspend, corgi_lcd_resume);
 480
 481 static int setup_gpio_backlight(struct corgi_lcd *lcd,
 482                                 struct corgi_lcd_platform_data *pdata)
 483 {
 484         struct spi_device *spi = lcd->spi_dev;
 485         int err;
 486
 487         lcd->gpio_backlight_on = -1;
 488         lcd->gpio_backlight_cont = -1;
 489
 490         if (gpio_is_valid(pdata->gpio_backlight_on)) {
 491                 err = devm_gpio_request(&spi->dev, pdata->gpio_backlight_on,
 492                                         "BL_ON");
 493                 if (err) {
 494                         dev_err(&spi->dev,
 495                                 "failed to request GPIO%d for backlight_on\n",
 496                                 pdata->gpio_backlight_on);
 497                         return err;
 498                 }
 499
 500                 lcd->gpio_backlight_on = pdata->gpio_backlight_on;
 501                 gpio_direction_output(lcd->gpio_backlight_on, 0);
 502         }
 503
 504         if (gpio_is_valid(pdata->gpio_backlight_cont)) {
 505                 err = devm_gpio_request(&spi->dev, pdata->gpio_backlight_cont,
 506                                         "BL_CONT");
 507                 if (err) {
 508                         dev_err(&spi->dev,
 509                                 "failed to request GPIO%d for backlight_cont\n",
 510                                 pdata->gpio_backlight_cont);
 511                         return err;
 512                 }
 513
 514                 lcd->gpio_backlight_cont = pdata->gpio_backlight_cont;
 515
 516                 /* spitz and akita use both GPIOs for backlight, and
 517                  * have inverted polarity of GPIO_BACKLIGHT_CONT
 518                  */
 519                 if (gpio_is_valid(lcd->gpio_backlight_on)) {
 520                         lcd->gpio_backlight_cont_inverted = 1;
 521                         gpio_direction_output(lcd->gpio_backlight_cont, 1);
 522                 } else {
 523                         lcd->gpio_backlight_cont_inverted = 0;
 524                         gpio_direction_output(lcd->gpio_backlight_cont, 0);
 525                 }
 526         }
 527         return 0;
 528 }
 529
 530 static int corgi_lcd_probe(struct spi_device *spi)
 531 {
 532         struct backlight_properties props;
 533         struct corgi_lcd_platform_data *pdata = dev_get_platdata(&spi->dev);
 534         struct corgi_lcd *lcd;
 535         int ret = 0;
 536
 537         if (pdata == NULL) {
 538                 dev_err(&spi->dev, "platform data not available\n");
 539                 return -EINVAL;
 540         }
 541
 542         lcd = devm_kzalloc(&spi->dev, sizeof(struct corgi_lcd), GFP_KERNEL);
 543         if (!lcd)
 544                 return -ENOMEM;
 545
 546         lcd->spi_dev = spi;
 547
 548         lcd->lcd_dev = devm_lcd_device_register(&spi->dev, "corgi_lcd",
 549                                                 &spi->dev, lcd, &corgi_lcd_ops);
 550         if (IS_ERR(lcd->lcd_dev))
 551                 return PTR_ERR(lcd->lcd_dev);
 552
 553         lcd->power = FB_BLANK_POWERDOWN;
 554         lcd->mode = (pdata) ? pdata->init_mode : CORGI_LCD_MODE_VGA;
 555
 556         memset(&props, 0, sizeof(struct backlight_properties));
 557         props.type = BACKLIGHT_RAW;
 558         props.max_brightness = pdata->max_intensity;
 559         lcd->bl_dev = devm_backlight_device_register(&spi->dev, "corgi_bl",
 560                                                 &spi->dev, lcd, &corgi_bl_ops,
 561                                                 &props);
 562         if (IS_ERR(lcd->bl_dev))
 563                 return PTR_ERR(lcd->bl_dev);
 564
 565         lcd->bl_dev->props.brightness = pdata->default_intensity;
 566         lcd->bl_dev->props.power = FB_BLANK_UNBLANK;
 567
 568         ret = setup_gpio_backlight(lcd, pdata);
 569         if (ret)
 570                 return ret;
 571
 572         lcd->kick_battery = pdata->kick_battery;
 573
 574         spi_set_drvdata(spi, lcd);
 575         corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK);
 576         backlight_update_status(lcd->bl_dev);
 577
 578         lcd->limit_mask = pdata->limit_mask;
 579         the_corgi_lcd = lcd;
 580         return 0;
 581 }
 582
 583 static int corgi_lcd_remove(struct spi_device *spi)
 584 {
 585         struct corgi_lcd *lcd = spi_get_drvdata(spi);
 586
 587         lcd->bl_dev->props.power = FB_BLANK_UNBLANK;
 588         lcd->bl_dev->props.brightness = 0;
 589         backlight_update_status(lcd->bl_dev);
 590         corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN);
 591         return 0;
 592 }
 593
 594 static struct spi_driver corgi_lcd_driver = {
 595         .driver         = {
 596                 .name   = "corgi-lcd",
 597                 .pm     = &corgi_lcd_pm_ops,
 598         },
 599         .probe          = corgi_lcd_probe,
 600         .remove         = corgi_lcd_remove,
 601 };
 602
 603 module_spi_driver(corgi_lcd_driver);
 604
 605 MODULE_DESCRIPTION("LCD and backlight driver for SHARP C7x0/Cxx00");
 606 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
 607 MODULE_LICENSE("GPL");
 608 MODULE_ALIAS("spi:corgi-lcd");