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         for (i = 0; i < 8; i++) {
 147                 if (data & 0x80)
 148                         lcdtg_i2c_send_bit(lcd, base | POWER0_COM_DOUT);
 149                 else
 150                         lcdtg_i2c_send_bit(lcd, base);
 151                 data <<= 1;
 152         }
 153 }
 154
 155 static void lcdtg_i2c_wait_ack(struct corgi_lcd *lcd, uint8_t base)
 156 {
 157         lcdtg_i2c_send_bit(lcd, base);
 158 }
 159
 160 static void lcdtg_set_common_voltage(struct corgi_lcd *lcd,
 161                                      uint8_t base_data, uint8_t data)
 162 {
 163         /* Set Common Voltage to M62332FP via I2C */
 164         lcdtg_i2c_send_start(lcd, base_data);
 165         lcdtg_i2c_send_byte(lcd, base_data, 0x9c);
 166         lcdtg_i2c_wait_ack(lcd, base_data);
 167         lcdtg_i2c_send_byte(lcd, base_data, 0x00);
 168         lcdtg_i2c_wait_ack(lcd, base_data);
 169         lcdtg_i2c_send_byte(lcd, base_data, data);
 170         lcdtg_i2c_wait_ack(lcd, base_data);
 171         lcdtg_i2c_send_stop(lcd, base_data);
 172 }
 173
 174 static int corgi_ssp_lcdtg_send(struct corgi_lcd *lcd, int adrs, uint8_t data)
 175 {
 176         struct spi_message msg;
 177         struct spi_transfer xfer = {
 178                 .len            = 1,
 179                 .cs_change      = 1,
 180                 .tx_buf         = lcd->buf,
 181         };
 182
 183         lcd->buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f);
 184         spi_message_init(&msg);
 185         spi_message_add_tail(&xfer, &msg);
 186
 187         return spi_sync(lcd->spi_dev, &msg);
 188 }
 189
 190 /* Set Phase Adjust */
 191 static void lcdtg_set_phadadj(struct corgi_lcd *lcd, int mode)
 192 {
 193         int adj;
 194
 195         switch (mode) {
 196         case CORGI_LCD_MODE_VGA:
 197                 /* Setting for VGA */
 198                 adj = sharpsl_param.phadadj;
 199                 adj = (adj < 0) ? PHACTRL_PHASE_MANUAL :
 200                                   PHACTRL_PHASE_MANUAL | ((adj & 0xf) << 1);
 201                 break;
 202         case CORGI_LCD_MODE_QVGA:
 203         default:
 204                 /* Setting for QVGA */
 205                 adj = (DEFAULT_PHAD_QVGA << 1) | PHACTRL_PHASE_MANUAL;
 206                 break;
 207         }
 208
 209         corgi_ssp_lcdtg_send(lcd, PHACTRL_ADRS, adj);
 210 }
 211
 212 static void corgi_lcd_power_on(struct corgi_lcd *lcd)
 213 {
 214         int comadj;
 215
 216         /* Initialize Internal Logic & Port */
 217         corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
 218                         PICTRL_POWER_DOWN | PICTRL_INIOFF |
 219                         PICTRL_INIT_STATE | PICTRL_COM_SIGNAL_OFF |
 220                         PICTRL_DAC_SIGNAL_OFF);
 221
 222         corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
 223                         POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_OFF |
 224                         POWER0_COM_OFF | POWER0_VCC5_OFF);
 225
 226         corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
 227                         POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_OFF);
 228
 229         /* VDD(+8V), SVSS(-4V) ON */
 230         corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
 231                         POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_ON);
 232         mdelay(3);
 233
 234         /* DAC ON */
 235         corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
 236                         POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
 237                         POWER0_COM_OFF | POWER0_VCC5_OFF);
 238
 239         /* INIB = H, INI = L  */
 240         /* PICTL[0] = H , PICTL[1] = PICTL[2] = PICTL[4] = L */
 241         corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
 242                         PICTRL_INIT_STATE | PICTRL_COM_SIGNAL_OFF);
 243
 244         /* Set Common Voltage */
 245         comadj = sharpsl_param.comadj;
 246         if (comadj < 0)
 247                 comadj = DEFAULT_COMADJ;
 248
 249         lcdtg_set_common_voltage(lcd, POWER0_DAC_ON | POWER0_COM_OFF |
 250                                  POWER0_VCC5_OFF, comadj);
 251
 252         /* VCC5 ON, DAC ON */
 253         corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
 254                         POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
 255                         POWER0_COM_OFF | POWER0_VCC5_ON);
 256
 257         /* GVSS(-8V) ON, VDD ON */
 258         corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
 259                         POWER1_VW_OFF | POWER1_GVSS_ON | POWER1_VDD_ON);
 260         mdelay(2);
 261
 262         /* COM SIGNAL ON (PICTL[3] = L) */
 263         corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_INIT_STATE);
 264
 265         /* COM ON, DAC ON, VCC5_ON */
 266         corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
 267                         POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
 268                         POWER0_COM_ON | POWER0_VCC5_ON);
 269
 270         /* VW ON, GVSS ON, VDD ON */
 271         corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
 272                         POWER1_VW_ON | POWER1_GVSS_ON | POWER1_VDD_ON);
 273
 274         /* Signals output enable */
 275         corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, 0);
 276
 277         /* Set Phase Adjust */
 278         lcdtg_set_phadadj(lcd, lcd->mode);
 279
 280         /* Initialize for Input Signals from ATI */
 281         corgi_ssp_lcdtg_send(lcd, POLCTRL_ADRS,
 282                         POLCTRL_SYNC_POL_RISE | POLCTRL_EN_POL_RISE |
 283                         POLCTRL_DATA_POL_RISE | POLCTRL_SYNC_ACT_L |
 284                         POLCTRL_EN_ACT_H);
 285         udelay(1000);
 286
 287         switch (lcd->mode) {
 288         case CORGI_LCD_MODE_VGA:
 289                 corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA);
 290                 break;
 291         case CORGI_LCD_MODE_QVGA:
 292         default:
 293                 corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA);
 294                 break;
 295         }
 296 }
 297
 298 static void corgi_lcd_power_off(struct corgi_lcd *lcd)
 299 {
 300         /* 60Hz x 2 frame = 16.7msec x 2 = 33.4 msec */
 301         msleep(34);
 302
 303         /* (1)VW OFF */
 304         corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
 305                         POWER1_VW_OFF | POWER1_GVSS_ON | POWER1_VDD_ON);
 306
 307         /* (2)COM OFF */
 308         corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_COM_SIGNAL_OFF);
 309         corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
 310                         POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_ON);
 311
 312         /* (3)Set Common Voltage Bias 0V */
 313         lcdtg_set_common_voltage(lcd, POWER0_DAC_ON | POWER0_COM_OFF |
 314                         POWER0_VCC5_ON, 0);
 315
 316         /* (4)GVSS OFF */
 317         corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
 318                         POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_ON);
 319
 320         /* (5)VCC5 OFF */
 321         corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
 322                         POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_OFF);
 323
 324         /* (6)Set PDWN, INIOFF, DACOFF */
 325         corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
 326                         PICTRL_INIOFF | PICTRL_DAC_SIGNAL_OFF |
 327                         PICTRL_POWER_DOWN | PICTRL_COM_SIGNAL_OFF);
 328
 329         /* (7)DAC OFF */
 330         corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
 331                         POWER0_DAC_OFF | POWER0_COM_OFF | POWER0_VCC5_OFF);
 332
 333         /* (8)VDD OFF */
 334         corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
 335                         POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_OFF);
 336 }
 337
 338 static int corgi_lcd_set_mode(struct lcd_device *ld, struct fb_videomode *m)
 339 {
 340         struct corgi_lcd *lcd = lcd_get_data(ld);
 341         int mode = CORGI_LCD_MODE_QVGA;
 342
 343         if (m->xres == 640 || m->xres == 480)
 344                 mode = CORGI_LCD_MODE_VGA;
 345
 346         if (lcd->mode == mode)
 347                 return 0;
 348
 349         lcdtg_set_phadadj(lcd, mode);
 350
 351         switch (mode) {
 352         case CORGI_LCD_MODE_VGA:
 353                 corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA);
 354                 break;
 355         case CORGI_LCD_MODE_QVGA:
 356         default:
 357                 corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA);
 358                 break;
 359         }
 360
 361         lcd->mode = mode;
 362         return 0;
 363 }
 364
 365 static int corgi_lcd_set_power(struct lcd_device *ld, int power)
 366 {
 367         struct corgi_lcd *lcd = lcd_get_data(ld);
 368
 369         if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
 370                 corgi_lcd_power_on(lcd);
 371
 372         if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
 373                 corgi_lcd_power_off(lcd);
 374
 375         lcd->power = power;
 376         return 0;
 377 }
 378
 379 static int corgi_lcd_get_power(struct lcd_device *ld)
 380 {
 381         struct corgi_lcd *lcd = lcd_get_data(ld);
 382
 383         return lcd->power;
 384 }
 385
 386 static struct lcd_ops corgi_lcd_ops = {
 387         .get_power      = corgi_lcd_get_power,
 388         .set_power      = corgi_lcd_set_power,
 389         .set_mode       = corgi_lcd_set_mode,
 390 };
 391
 392 static int corgi_bl_get_intensity(struct backlight_device *bd)
 393 {
 394         struct corgi_lcd *lcd = bl_get_data(bd);
 395
 396         return lcd->intensity;
 397 }
 398
 399 static int corgi_bl_set_intensity(struct corgi_lcd *lcd, int intensity)
 400 {
 401         int cont;
 402
 403         if (intensity > 0x10)
 404                 intensity += 0x10;
 405
 406         corgi_ssp_lcdtg_send(lcd, DUTYCTRL_ADRS, intensity);
 407
 408         /* Bit 5 via GPIO_BACKLIGHT_CONT */
 409         cont = !!(intensity & 0x20) ^ lcd->gpio_backlight_cont_inverted;
 410
 411         if (gpio_is_valid(lcd->gpio_backlight_cont))
 412                 gpio_set_value_cansleep(lcd->gpio_backlight_cont, cont);
 413
 414         if (gpio_is_valid(lcd->gpio_backlight_on))
 415                 gpio_set_value_cansleep(lcd->gpio_backlight_on, intensity);
 416
 417         if (lcd->kick_battery)
 418                 lcd->kick_battery();
 419
 420         lcd->intensity = intensity;
 421         return 0;
 422 }
 423
 424 static int corgi_bl_update_status(struct backlight_device *bd)
 425 {
 426         struct corgi_lcd *lcd = bl_get_data(bd);
 427         int intensity = bd->props.brightness;
 428
 429         if (bd->props.power != FB_BLANK_UNBLANK)
 430                 intensity = 0;
 431
 432         if (bd->props.fb_blank != FB_BLANK_UNBLANK)
 433                 intensity = 0;
 434
 435         if (corgibl_flags & CORGIBL_SUSPENDED)
 436                 intensity = 0;
 437
 438         if ((corgibl_flags & CORGIBL_BATTLOW) && intensity > lcd->limit_mask)
 439                 intensity = lcd->limit_mask;
 440
 441         return corgi_bl_set_intensity(lcd, intensity);
 442 }
 443
 444 void corgi_lcd_limit_intensity(int limit)
 445 {
 446         if (limit)
 447                 corgibl_flags |= CORGIBL_BATTLOW;
 448         else
 449                 corgibl_flags &= ~CORGIBL_BATTLOW;
 450
 451         backlight_update_status(the_corgi_lcd->bl_dev);
 452 }
 453 EXPORT_SYMBOL(corgi_lcd_limit_intensity);
 454
 455 static const struct backlight_ops corgi_bl_ops = {
 456         .get_brightness = corgi_bl_get_intensity,
 457         .update_status  = corgi_bl_update_status,
 458 };
 459
 460 #ifdef CONFIG_PM_SLEEP
 461 static int corgi_lcd_suspend(struct device *dev)
 462 {
 463         struct corgi_lcd *lcd = dev_get_drvdata(dev);
 464
 465         corgibl_flags |= CORGIBL_SUSPENDED;
 466         corgi_bl_set_intensity(lcd, 0);
 467         corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN);
 468         return 0;
 469 }
 470
 471 static int corgi_lcd_resume(struct device *dev)
 472 {
 473         struct corgi_lcd *lcd = dev_get_drvdata(dev);
 474
 475         corgibl_flags &= ~CORGIBL_SUSPENDED;
 476         corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK);
 477         backlight_update_status(lcd->bl_dev);
 478         return 0;
 479 }
 480 #endif
 481
 482 static SIMPLE_DEV_PM_OPS(corgi_lcd_pm_ops, corgi_lcd_suspend, corgi_lcd_resume);
 483
 484 static int setup_gpio_backlight(struct corgi_lcd *lcd,
 485                                 struct corgi_lcd_platform_data *pdata)
 486 {
 487         struct spi_device *spi = lcd->spi_dev;
 488         int err;
 489
 490         lcd->gpio_backlight_on = -1;
 491         lcd->gpio_backlight_cont = -1;
 492
 493         if (gpio_is_valid(pdata->gpio_backlight_on)) {
 494                 err = devm_gpio_request(&spi->dev, pdata->gpio_backlight_on,
 495                                         "BL_ON");
 496                 if (err) {
 497                         dev_err(&spi->dev,
 498                                 "failed to request GPIO%d for backlight_on\n",
 499                                 pdata->gpio_backlight_on);
 500                         return err;
 501                 }
 502
 503                 lcd->gpio_backlight_on = pdata->gpio_backlight_on;
 504                 gpio_direction_output(lcd->gpio_backlight_on, 0);
 505         }
 506
 507         if (gpio_is_valid(pdata->gpio_backlight_cont)) {
 508                 err = devm_gpio_request(&spi->dev, pdata->gpio_backlight_cont,
 509                                         "BL_CONT");
 510                 if (err) {
 511                         dev_err(&spi->dev,
 512                                 "failed to request GPIO%d for backlight_cont\n",
 513                                 pdata->gpio_backlight_cont);
 514                         return err;
 515                 }
 516
 517                 lcd->gpio_backlight_cont = pdata->gpio_backlight_cont;
 518
 519                 /* spitz and akita use both GPIOs for backlight, and
 520                  * have inverted polarity of GPIO_BACKLIGHT_CONT
 521                  */
 522                 if (gpio_is_valid(lcd->gpio_backlight_on)) {
 523                         lcd->gpio_backlight_cont_inverted = 1;
 524                         gpio_direction_output(lcd->gpio_backlight_cont, 1);
 525                 } else {
 526                         lcd->gpio_backlight_cont_inverted = 0;
 527                         gpio_direction_output(lcd->gpio_backlight_cont, 0);
 528                 }
 529         }
 530         return 0;
 531 }
 532
 533 static int corgi_lcd_probe(struct spi_device *spi)
 534 {
 535         struct backlight_properties props;
 536         struct corgi_lcd_platform_data *pdata = dev_get_platdata(&spi->dev);
 537         struct corgi_lcd *lcd;
 538         int ret = 0;
 539
 540         if (pdata == NULL) {
 541                 dev_err(&spi->dev, "platform data not available\n");
 542                 return -EINVAL;
 543         }
 544
 545         lcd = devm_kzalloc(&spi->dev, sizeof(struct corgi_lcd), GFP_KERNEL);
 546         if (!lcd) {
 547                 dev_err(&spi->dev, "failed to allocate memory\n");
 548                 return -ENOMEM;
 549         }
 550
 551         lcd->spi_dev = spi;
 552
 553         lcd->lcd_dev = devm_lcd_device_register(&spi->dev, "corgi_lcd",
 554                                                 &spi->dev, lcd, &corgi_lcd_ops);
 555         if (IS_ERR(lcd->lcd_dev))
 556                 return PTR_ERR(lcd->lcd_dev);
 557
 558         lcd->power = FB_BLANK_POWERDOWN;
 559         lcd->mode = (pdata) ? pdata->init_mode : CORGI_LCD_MODE_VGA;
 560
 561         memset(&props, 0, sizeof(struct backlight_properties));
 562         props.type = BACKLIGHT_RAW;
 563         props.max_brightness = pdata->max_intensity;
 564         lcd->bl_dev = devm_backlight_device_register(&spi->dev, "corgi_bl",
 565                                                 &spi->dev, lcd, &corgi_bl_ops,
 566                                                 &props);
 567         if (IS_ERR(lcd->bl_dev))
 568                 return PTR_ERR(lcd->bl_dev);
 569
 570         lcd->bl_dev->props.brightness = pdata->default_intensity;
 571         lcd->bl_dev->props.power = FB_BLANK_UNBLANK;
 572
 573         ret = setup_gpio_backlight(lcd, pdata);
 574         if (ret)
 575                 return ret;
 576
 577         lcd->kick_battery = pdata->kick_battery;
 578
 579         spi_set_drvdata(spi, lcd);
 580         corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK);
 581         backlight_update_status(lcd->bl_dev);
 582
 583         lcd->limit_mask = pdata->limit_mask;
 584         the_corgi_lcd = lcd;
 585         return 0;
 586 }
 587
 588 static int corgi_lcd_remove(struct spi_device *spi)
 589 {
 590         struct corgi_lcd *lcd = spi_get_drvdata(spi);
 591
 592         lcd->bl_dev->props.power = FB_BLANK_UNBLANK;
 593         lcd->bl_dev->props.brightness = 0;
 594         backlight_update_status(lcd->bl_dev);
 595         corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN);
 596         return 0;
 597 }
 598
 599 static struct spi_driver corgi_lcd_driver = {
 600         .driver         = {
 601                 .name   = "corgi-lcd",
 602                 .owner  = THIS_MODULE,
 603                 .pm     = &corgi_lcd_pm_ops,
 604         },
 605         .probe          = corgi_lcd_probe,
 606         .remove         = corgi_lcd_remove,
 607 };
 608
 609 module_spi_driver(corgi_lcd_driver);
 610
 611 MODULE_DESCRIPTION("LCD and backlight driver for SHARP C7x0/Cxx00");
 612 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
 613 MODULE_LICENSE("GPL");
 614 MODULE_ALIAS("spi:corgi-lcd");