drivers/video/backlight/corgi_lcd.c

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