Jingoo Han | a4c8aaa | 2011-07-25 17:12:00 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * ams369fg06 AMOLED LCD panel driver. |
| 3 | * |
| 4 | * Copyright (c) 2011 Samsung Electronics Co., Ltd. |
| 5 | * Author: Jingoo Han <jg1.han@samsung.com> |
| 6 | * |
| 7 | * Derived from drivers/video/s6e63m0.c |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify it |
| 10 | * under the terms of the GNU General Public License as published by the |
| 11 | * Free Software Foundation; either version 2 of the License, or (at your |
| 12 | * option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, but |
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License along |
| 20 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 21 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 22 | */ |
| 23 | |
| 24 | #include <linux/wait.h> |
| 25 | #include <linux/fb.h> |
| 26 | #include <linux/delay.h> |
| 27 | #include <linux/gpio.h> |
| 28 | #include <linux/spi/spi.h> |
| 29 | #include <linux/lcd.h> |
| 30 | #include <linux/backlight.h> |
| 31 | |
| 32 | #define SLEEPMSEC 0x1000 |
| 33 | #define ENDDEF 0x2000 |
| 34 | #define DEFMASK 0xFF00 |
| 35 | #define COMMAND_ONLY 0xFE |
| 36 | #define DATA_ONLY 0xFF |
| 37 | |
| 38 | #define MAX_GAMMA_LEVEL 5 |
| 39 | #define GAMMA_TABLE_COUNT 21 |
| 40 | |
| 41 | #define MIN_BRIGHTNESS 0 |
| 42 | #define MAX_BRIGHTNESS 255 |
| 43 | #define DEFAULT_BRIGHTNESS 150 |
| 44 | |
| 45 | struct ams369fg06 { |
| 46 | struct device *dev; |
| 47 | struct spi_device *spi; |
| 48 | unsigned int power; |
| 49 | struct lcd_device *ld; |
| 50 | struct backlight_device *bd; |
| 51 | struct lcd_platform_data *lcd_pd; |
| 52 | }; |
| 53 | |
| 54 | static const unsigned short seq_display_on[] = { |
| 55 | 0x14, 0x03, |
| 56 | ENDDEF, 0x0000 |
| 57 | }; |
| 58 | |
| 59 | static const unsigned short seq_display_off[] = { |
| 60 | 0x14, 0x00, |
| 61 | ENDDEF, 0x0000 |
| 62 | }; |
| 63 | |
| 64 | static const unsigned short seq_stand_by_on[] = { |
| 65 | 0x1D, 0xA1, |
| 66 | SLEEPMSEC, 200, |
| 67 | ENDDEF, 0x0000 |
| 68 | }; |
| 69 | |
| 70 | static const unsigned short seq_stand_by_off[] = { |
| 71 | 0x1D, 0xA0, |
| 72 | SLEEPMSEC, 250, |
| 73 | ENDDEF, 0x0000 |
| 74 | }; |
| 75 | |
| 76 | static const unsigned short seq_setting[] = { |
| 77 | 0x31, 0x08, |
| 78 | 0x32, 0x14, |
| 79 | 0x30, 0x02, |
| 80 | 0x27, 0x01, |
| 81 | 0x12, 0x08, |
| 82 | 0x13, 0x08, |
| 83 | 0x15, 0x00, |
| 84 | 0x16, 0x00, |
| 85 | |
| 86 | 0xef, 0xd0, |
| 87 | DATA_ONLY, 0xe8, |
| 88 | |
| 89 | 0x39, 0x44, |
| 90 | 0x40, 0x00, |
| 91 | 0x41, 0x3f, |
| 92 | 0x42, 0x2a, |
| 93 | 0x43, 0x27, |
| 94 | 0x44, 0x27, |
| 95 | 0x45, 0x1f, |
| 96 | 0x46, 0x44, |
| 97 | 0x50, 0x00, |
| 98 | 0x51, 0x00, |
| 99 | 0x52, 0x17, |
| 100 | 0x53, 0x24, |
| 101 | 0x54, 0x26, |
| 102 | 0x55, 0x1f, |
| 103 | 0x56, 0x43, |
| 104 | 0x60, 0x00, |
| 105 | 0x61, 0x3f, |
| 106 | 0x62, 0x2a, |
| 107 | 0x63, 0x25, |
| 108 | 0x64, 0x24, |
| 109 | 0x65, 0x1b, |
| 110 | 0x66, 0x5c, |
| 111 | |
| 112 | 0x17, 0x22, |
| 113 | 0x18, 0x33, |
| 114 | 0x19, 0x03, |
| 115 | 0x1a, 0x01, |
| 116 | 0x22, 0xa4, |
| 117 | 0x23, 0x00, |
| 118 | 0x26, 0xa0, |
| 119 | |
| 120 | 0x1d, 0xa0, |
| 121 | SLEEPMSEC, 300, |
| 122 | |
| 123 | 0x14, 0x03, |
| 124 | |
| 125 | ENDDEF, 0x0000 |
| 126 | }; |
| 127 | |
| 128 | /* gamma value: 2.2 */ |
| 129 | static const unsigned int ams369fg06_22_250[] = { |
| 130 | 0x00, 0x3f, 0x2a, 0x27, 0x27, 0x1f, 0x44, |
| 131 | 0x00, 0x00, 0x17, 0x24, 0x26, 0x1f, 0x43, |
| 132 | 0x00, 0x3f, 0x2a, 0x25, 0x24, 0x1b, 0x5c, |
| 133 | }; |
| 134 | |
| 135 | static const unsigned int ams369fg06_22_200[] = { |
| 136 | 0x00, 0x3f, 0x28, 0x29, 0x27, 0x21, 0x3e, |
| 137 | 0x00, 0x00, 0x10, 0x25, 0x27, 0x20, 0x3d, |
| 138 | 0x00, 0x3f, 0x28, 0x27, 0x25, 0x1d, 0x53, |
| 139 | }; |
| 140 | |
| 141 | static const unsigned int ams369fg06_22_150[] = { |
| 142 | 0x00, 0x3f, 0x2d, 0x29, 0x28, 0x23, 0x37, |
| 143 | 0x00, 0x00, 0x0b, 0x25, 0x28, 0x22, 0x36, |
| 144 | 0x00, 0x3f, 0x2b, 0x28, 0x26, 0x1f, 0x4a, |
| 145 | }; |
| 146 | |
| 147 | static const unsigned int ams369fg06_22_100[] = { |
| 148 | 0x00, 0x3f, 0x30, 0x2a, 0x2b, 0x24, 0x2f, |
| 149 | 0x00, 0x00, 0x00, 0x25, 0x29, 0x24, 0x2e, |
| 150 | 0x00, 0x3f, 0x2f, 0x29, 0x29, 0x21, 0x3f, |
| 151 | }; |
| 152 | |
| 153 | static const unsigned int ams369fg06_22_50[] = { |
| 154 | 0x00, 0x3f, 0x3c, 0x2c, 0x2d, 0x27, 0x24, |
| 155 | 0x00, 0x00, 0x00, 0x22, 0x2a, 0x27, 0x23, |
| 156 | 0x00, 0x3f, 0x3b, 0x2c, 0x2b, 0x24, 0x31, |
| 157 | }; |
| 158 | |
| 159 | struct ams369fg06_gamma { |
| 160 | unsigned int *gamma_22_table[MAX_GAMMA_LEVEL]; |
| 161 | }; |
| 162 | |
| 163 | static struct ams369fg06_gamma gamma_table = { |
| 164 | .gamma_22_table[0] = (unsigned int *)&ams369fg06_22_50, |
| 165 | .gamma_22_table[1] = (unsigned int *)&ams369fg06_22_100, |
| 166 | .gamma_22_table[2] = (unsigned int *)&ams369fg06_22_150, |
| 167 | .gamma_22_table[3] = (unsigned int *)&ams369fg06_22_200, |
| 168 | .gamma_22_table[4] = (unsigned int *)&ams369fg06_22_250, |
| 169 | }; |
| 170 | |
| 171 | static int ams369fg06_spi_write_byte(struct ams369fg06 *lcd, int addr, int data) |
| 172 | { |
| 173 | u16 buf[1]; |
| 174 | struct spi_message msg; |
| 175 | |
| 176 | struct spi_transfer xfer = { |
| 177 | .len = 2, |
| 178 | .tx_buf = buf, |
| 179 | }; |
| 180 | |
| 181 | buf[0] = (addr << 8) | data; |
| 182 | |
| 183 | spi_message_init(&msg); |
| 184 | spi_message_add_tail(&xfer, &msg); |
| 185 | |
| 186 | return spi_sync(lcd->spi, &msg); |
| 187 | } |
| 188 | |
| 189 | static int ams369fg06_spi_write(struct ams369fg06 *lcd, unsigned char address, |
| 190 | unsigned char command) |
| 191 | { |
| 192 | int ret = 0; |
| 193 | |
| 194 | if (address != DATA_ONLY) |
| 195 | ret = ams369fg06_spi_write_byte(lcd, 0x70, address); |
| 196 | if (command != COMMAND_ONLY) |
| 197 | ret = ams369fg06_spi_write_byte(lcd, 0x72, command); |
| 198 | |
| 199 | return ret; |
| 200 | } |
| 201 | |
| 202 | static int ams369fg06_panel_send_sequence(struct ams369fg06 *lcd, |
| 203 | const unsigned short *wbuf) |
| 204 | { |
| 205 | int ret = 0, i = 0; |
| 206 | |
| 207 | while ((wbuf[i] & DEFMASK) != ENDDEF) { |
| 208 | if ((wbuf[i] & DEFMASK) != SLEEPMSEC) { |
| 209 | ret = ams369fg06_spi_write(lcd, wbuf[i], wbuf[i+1]); |
| 210 | if (ret) |
| 211 | break; |
| 212 | } else |
| 213 | mdelay(wbuf[i+1]); |
| 214 | i += 2; |
| 215 | } |
| 216 | |
| 217 | return ret; |
| 218 | } |
| 219 | |
| 220 | static int _ams369fg06_gamma_ctl(struct ams369fg06 *lcd, |
| 221 | const unsigned int *gamma) |
| 222 | { |
| 223 | unsigned int i = 0; |
| 224 | int ret = 0; |
| 225 | |
| 226 | for (i = 0 ; i < GAMMA_TABLE_COUNT / 3; i++) { |
| 227 | ret = ams369fg06_spi_write(lcd, 0x40 + i, gamma[i]); |
| 228 | ret = ams369fg06_spi_write(lcd, 0x50 + i, gamma[i+7*1]); |
| 229 | ret = ams369fg06_spi_write(lcd, 0x60 + i, gamma[i+7*2]); |
| 230 | if (ret) { |
| 231 | dev_err(lcd->dev, "failed to set gamma table.\n"); |
| 232 | goto gamma_err; |
| 233 | } |
| 234 | } |
| 235 | |
| 236 | gamma_err: |
| 237 | return ret; |
| 238 | } |
| 239 | |
| 240 | static int ams369fg06_gamma_ctl(struct ams369fg06 *lcd, int brightness) |
| 241 | { |
| 242 | int ret = 0; |
| 243 | int gamma = 0; |
| 244 | |
| 245 | if ((brightness >= 0) && (brightness <= 50)) |
| 246 | gamma = 0; |
| 247 | else if ((brightness > 50) && (brightness <= 100)) |
| 248 | gamma = 1; |
| 249 | else if ((brightness > 100) && (brightness <= 150)) |
| 250 | gamma = 2; |
| 251 | else if ((brightness > 150) && (brightness <= 200)) |
| 252 | gamma = 3; |
| 253 | else if ((brightness > 200) && (brightness <= 255)) |
| 254 | gamma = 4; |
| 255 | |
| 256 | ret = _ams369fg06_gamma_ctl(lcd, gamma_table.gamma_22_table[gamma]); |
| 257 | |
| 258 | return ret; |
| 259 | } |
| 260 | |
| 261 | static int ams369fg06_ldi_init(struct ams369fg06 *lcd) |
| 262 | { |
| 263 | int ret, i; |
| 264 | static const unsigned short *init_seq[] = { |
| 265 | seq_setting, |
| 266 | seq_stand_by_off, |
| 267 | }; |
| 268 | |
| 269 | for (i = 0; i < ARRAY_SIZE(init_seq); i++) { |
| 270 | ret = ams369fg06_panel_send_sequence(lcd, init_seq[i]); |
| 271 | if (ret) |
| 272 | break; |
| 273 | } |
| 274 | |
| 275 | return ret; |
| 276 | } |
| 277 | |
| 278 | static int ams369fg06_ldi_enable(struct ams369fg06 *lcd) |
| 279 | { |
| 280 | int ret, i; |
| 281 | static const unsigned short *init_seq[] = { |
| 282 | seq_stand_by_off, |
| 283 | seq_display_on, |
| 284 | }; |
| 285 | |
| 286 | for (i = 0; i < ARRAY_SIZE(init_seq); i++) { |
| 287 | ret = ams369fg06_panel_send_sequence(lcd, init_seq[i]); |
| 288 | if (ret) |
| 289 | break; |
| 290 | } |
| 291 | |
| 292 | return ret; |
| 293 | } |
| 294 | |
| 295 | static int ams369fg06_ldi_disable(struct ams369fg06 *lcd) |
| 296 | { |
| 297 | int ret, i; |
| 298 | |
| 299 | static const unsigned short *init_seq[] = { |
| 300 | seq_display_off, |
| 301 | seq_stand_by_on, |
| 302 | }; |
| 303 | |
| 304 | for (i = 0; i < ARRAY_SIZE(init_seq); i++) { |
| 305 | ret = ams369fg06_panel_send_sequence(lcd, init_seq[i]); |
| 306 | if (ret) |
| 307 | break; |
| 308 | } |
| 309 | |
| 310 | return ret; |
| 311 | } |
| 312 | |
| 313 | static int ams369fg06_power_is_on(int power) |
| 314 | { |
| 315 | return ((power) <= FB_BLANK_NORMAL); |
| 316 | } |
| 317 | |
| 318 | static int ams369fg06_power_on(struct ams369fg06 *lcd) |
| 319 | { |
| 320 | int ret = 0; |
| 321 | struct lcd_platform_data *pd = NULL; |
| 322 | struct backlight_device *bd = NULL; |
| 323 | |
| 324 | pd = lcd->lcd_pd; |
| 325 | if (!pd) { |
| 326 | dev_err(lcd->dev, "platform data is NULL.\n"); |
| 327 | return -EFAULT; |
| 328 | } |
| 329 | |
| 330 | bd = lcd->bd; |
| 331 | if (!bd) { |
| 332 | dev_err(lcd->dev, "backlight device is NULL.\n"); |
| 333 | return -EFAULT; |
| 334 | } |
| 335 | |
| 336 | if (!pd->power_on) { |
| 337 | dev_err(lcd->dev, "power_on is NULL.\n"); |
| 338 | return -EFAULT; |
| 339 | } else { |
| 340 | pd->power_on(lcd->ld, 1); |
| 341 | mdelay(pd->power_on_delay); |
| 342 | } |
| 343 | |
| 344 | if (!pd->reset) { |
| 345 | dev_err(lcd->dev, "reset is NULL.\n"); |
| 346 | return -EFAULT; |
| 347 | } else { |
| 348 | pd->reset(lcd->ld); |
| 349 | mdelay(pd->reset_delay); |
| 350 | } |
| 351 | |
| 352 | ret = ams369fg06_ldi_init(lcd); |
| 353 | if (ret) { |
| 354 | dev_err(lcd->dev, "failed to initialize ldi.\n"); |
| 355 | return ret; |
| 356 | } |
| 357 | |
| 358 | ret = ams369fg06_ldi_enable(lcd); |
| 359 | if (ret) { |
| 360 | dev_err(lcd->dev, "failed to enable ldi.\n"); |
| 361 | return ret; |
| 362 | } |
| 363 | |
| 364 | /* set brightness to current value after power on or resume. */ |
| 365 | ret = ams369fg06_gamma_ctl(lcd, bd->props.brightness); |
| 366 | if (ret) { |
| 367 | dev_err(lcd->dev, "lcd gamma setting failed.\n"); |
| 368 | return ret; |
| 369 | } |
| 370 | |
| 371 | return 0; |
| 372 | } |
| 373 | |
| 374 | static int ams369fg06_power_off(struct ams369fg06 *lcd) |
| 375 | { |
| 376 | int ret = 0; |
| 377 | struct lcd_platform_data *pd = NULL; |
| 378 | |
| 379 | pd = lcd->lcd_pd; |
| 380 | if (!pd) { |
| 381 | dev_err(lcd->dev, "platform data is NULL\n"); |
| 382 | return -EFAULT; |
| 383 | } |
| 384 | |
| 385 | ret = ams369fg06_ldi_disable(lcd); |
| 386 | if (ret) { |
| 387 | dev_err(lcd->dev, "lcd setting failed.\n"); |
| 388 | return -EIO; |
| 389 | } |
| 390 | |
| 391 | mdelay(pd->power_off_delay); |
| 392 | |
| 393 | if (!pd->power_on) { |
| 394 | dev_err(lcd->dev, "power_on is NULL.\n"); |
| 395 | return -EFAULT; |
| 396 | } else |
| 397 | pd->power_on(lcd->ld, 0); |
| 398 | |
| 399 | return 0; |
| 400 | } |
| 401 | |
| 402 | static int ams369fg06_power(struct ams369fg06 *lcd, int power) |
| 403 | { |
| 404 | int ret = 0; |
| 405 | |
| 406 | if (ams369fg06_power_is_on(power) && |
| 407 | !ams369fg06_power_is_on(lcd->power)) |
| 408 | ret = ams369fg06_power_on(lcd); |
| 409 | else if (!ams369fg06_power_is_on(power) && |
| 410 | ams369fg06_power_is_on(lcd->power)) |
| 411 | ret = ams369fg06_power_off(lcd); |
| 412 | |
| 413 | if (!ret) |
| 414 | lcd->power = power; |
| 415 | |
| 416 | return ret; |
| 417 | } |
| 418 | |
| 419 | static int ams369fg06_get_power(struct lcd_device *ld) |
| 420 | { |
| 421 | struct ams369fg06 *lcd = lcd_get_data(ld); |
| 422 | |
| 423 | return lcd->power; |
| 424 | } |
| 425 | |
| 426 | static int ams369fg06_set_power(struct lcd_device *ld, int power) |
| 427 | { |
| 428 | struct ams369fg06 *lcd = lcd_get_data(ld); |
| 429 | |
| 430 | if (power != FB_BLANK_UNBLANK && power != FB_BLANK_POWERDOWN && |
| 431 | power != FB_BLANK_NORMAL) { |
| 432 | dev_err(lcd->dev, "power value should be 0, 1 or 4.\n"); |
| 433 | return -EINVAL; |
| 434 | } |
| 435 | |
| 436 | return ams369fg06_power(lcd, power); |
| 437 | } |
| 438 | |
| 439 | static int ams369fg06_get_brightness(struct backlight_device *bd) |
| 440 | { |
| 441 | return bd->props.brightness; |
| 442 | } |
| 443 | |
| 444 | static int ams369fg06_set_brightness(struct backlight_device *bd) |
| 445 | { |
| 446 | int ret = 0; |
| 447 | int brightness = bd->props.brightness; |
| 448 | struct ams369fg06 *lcd = dev_get_drvdata(&bd->dev); |
| 449 | |
| 450 | if (brightness < MIN_BRIGHTNESS || |
| 451 | brightness > bd->props.max_brightness) { |
| 452 | dev_err(&bd->dev, "lcd brightness should be %d to %d.\n", |
| 453 | MIN_BRIGHTNESS, MAX_BRIGHTNESS); |
| 454 | return -EINVAL; |
| 455 | } |
| 456 | |
| 457 | ret = ams369fg06_gamma_ctl(lcd, bd->props.brightness); |
| 458 | if (ret) { |
| 459 | dev_err(&bd->dev, "lcd brightness setting failed.\n"); |
| 460 | return -EIO; |
| 461 | } |
| 462 | |
| 463 | return ret; |
| 464 | } |
| 465 | |
| 466 | static struct lcd_ops ams369fg06_lcd_ops = { |
| 467 | .get_power = ams369fg06_get_power, |
| 468 | .set_power = ams369fg06_set_power, |
| 469 | }; |
| 470 | |
| 471 | static const struct backlight_ops ams369fg06_backlight_ops = { |
| 472 | .get_brightness = ams369fg06_get_brightness, |
| 473 | .update_status = ams369fg06_set_brightness, |
| 474 | }; |
| 475 | |
| 476 | static int __devinit ams369fg06_probe(struct spi_device *spi) |
| 477 | { |
| 478 | int ret = 0; |
| 479 | struct ams369fg06 *lcd = NULL; |
| 480 | struct lcd_device *ld = NULL; |
| 481 | struct backlight_device *bd = NULL; |
| 482 | |
| 483 | lcd = kzalloc(sizeof(struct ams369fg06), GFP_KERNEL); |
| 484 | if (!lcd) |
| 485 | return -ENOMEM; |
| 486 | |
| 487 | /* ams369fg06 lcd panel uses 3-wire 16bits SPI Mode. */ |
| 488 | spi->bits_per_word = 16; |
| 489 | |
| 490 | ret = spi_setup(spi); |
| 491 | if (ret < 0) { |
| 492 | dev_err(&spi->dev, "spi setup failed.\n"); |
| 493 | goto out_free_lcd; |
| 494 | } |
| 495 | |
| 496 | lcd->spi = spi; |
| 497 | lcd->dev = &spi->dev; |
| 498 | |
| 499 | lcd->lcd_pd = spi->dev.platform_data; |
| 500 | if (!lcd->lcd_pd) { |
| 501 | dev_err(&spi->dev, "platform data is NULL\n"); |
| 502 | goto out_free_lcd; |
| 503 | } |
| 504 | |
| 505 | ld = lcd_device_register("ams369fg06", &spi->dev, lcd, |
| 506 | &ams369fg06_lcd_ops); |
| 507 | if (IS_ERR(ld)) { |
| 508 | ret = PTR_ERR(ld); |
| 509 | goto out_free_lcd; |
| 510 | } |
| 511 | |
| 512 | lcd->ld = ld; |
| 513 | |
| 514 | bd = backlight_device_register("ams369fg06-bl", &spi->dev, lcd, |
| 515 | &ams369fg06_backlight_ops, NULL); |
| 516 | if (IS_ERR(bd)) { |
| 517 | ret = PTR_ERR(bd); |
| 518 | goto out_lcd_unregister; |
| 519 | } |
| 520 | |
| 521 | bd->props.max_brightness = MAX_BRIGHTNESS; |
| 522 | bd->props.brightness = DEFAULT_BRIGHTNESS; |
| 523 | bd->props.type = BACKLIGHT_RAW; |
| 524 | lcd->bd = bd; |
| 525 | |
| 526 | if (!lcd->lcd_pd->lcd_enabled) { |
| 527 | /* |
| 528 | * if lcd panel was off from bootloader then |
| 529 | * current lcd status is powerdown and then |
| 530 | * it enables lcd panel. |
| 531 | */ |
| 532 | lcd->power = FB_BLANK_POWERDOWN; |
| 533 | |
| 534 | ams369fg06_power(lcd, FB_BLANK_UNBLANK); |
| 535 | } else |
| 536 | lcd->power = FB_BLANK_UNBLANK; |
| 537 | |
| 538 | dev_set_drvdata(&spi->dev, lcd); |
| 539 | |
| 540 | dev_info(&spi->dev, "ams369fg06 panel driver has been probed.\n"); |
| 541 | |
| 542 | return 0; |
| 543 | |
| 544 | out_lcd_unregister: |
| 545 | lcd_device_unregister(ld); |
| 546 | out_free_lcd: |
| 547 | kfree(lcd); |
| 548 | return ret; |
| 549 | } |
| 550 | |
| 551 | static int __devexit ams369fg06_remove(struct spi_device *spi) |
| 552 | { |
| 553 | struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev); |
| 554 | |
| 555 | ams369fg06_power(lcd, FB_BLANK_POWERDOWN); |
| 556 | backlight_device_unregister(lcd->bd); |
| 557 | lcd_device_unregister(lcd->ld); |
| 558 | kfree(lcd); |
| 559 | |
| 560 | return 0; |
| 561 | } |
| 562 | |
| 563 | #if defined(CONFIG_PM) |
| 564 | static unsigned int before_power; |
| 565 | |
| 566 | static int ams369fg06_suspend(struct spi_device *spi, pm_message_t mesg) |
| 567 | { |
| 568 | int ret = 0; |
| 569 | struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev); |
| 570 | |
| 571 | dev_dbg(&spi->dev, "lcd->power = %d\n", lcd->power); |
| 572 | |
| 573 | before_power = lcd->power; |
| 574 | |
| 575 | /* |
| 576 | * when lcd panel is suspend, lcd panel becomes off |
| 577 | * regardless of status. |
| 578 | */ |
| 579 | ret = ams369fg06_power(lcd, FB_BLANK_POWERDOWN); |
| 580 | |
| 581 | return ret; |
| 582 | } |
| 583 | |
| 584 | static int ams369fg06_resume(struct spi_device *spi) |
| 585 | { |
| 586 | int ret = 0; |
| 587 | struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev); |
| 588 | |
| 589 | /* |
| 590 | * after suspended, if lcd panel status is FB_BLANK_UNBLANK |
| 591 | * (at that time, before_power is FB_BLANK_UNBLANK) then |
| 592 | * it changes that status to FB_BLANK_POWERDOWN to get lcd on. |
| 593 | */ |
| 594 | if (before_power == FB_BLANK_UNBLANK) |
| 595 | lcd->power = FB_BLANK_POWERDOWN; |
| 596 | |
| 597 | dev_dbg(&spi->dev, "before_power = %d\n", before_power); |
| 598 | |
| 599 | ret = ams369fg06_power(lcd, before_power); |
| 600 | |
| 601 | return ret; |
| 602 | } |
| 603 | #else |
| 604 | #define ams369fg06_suspend NULL |
| 605 | #define ams369fg06_resume NULL |
| 606 | #endif |
| 607 | |
| 608 | static void ams369fg06_shutdown(struct spi_device *spi) |
| 609 | { |
| 610 | struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev); |
| 611 | |
| 612 | ams369fg06_power(lcd, FB_BLANK_POWERDOWN); |
| 613 | } |
| 614 | |
| 615 | static struct spi_driver ams369fg06_driver = { |
| 616 | .driver = { |
| 617 | .name = "ams369fg06", |
| 618 | .bus = &spi_bus_type, |
| 619 | .owner = THIS_MODULE, |
| 620 | }, |
| 621 | .probe = ams369fg06_probe, |
| 622 | .remove = __devexit_p(ams369fg06_remove), |
| 623 | .shutdown = ams369fg06_shutdown, |
| 624 | .suspend = ams369fg06_suspend, |
| 625 | .resume = ams369fg06_resume, |
| 626 | }; |
| 627 | |
| 628 | static int __init ams369fg06_init(void) |
| 629 | { |
| 630 | return spi_register_driver(&ams369fg06_driver); |
| 631 | } |
| 632 | |
| 633 | static void __exit ams369fg06_exit(void) |
| 634 | { |
| 635 | spi_unregister_driver(&ams369fg06_driver); |
| 636 | } |
| 637 | |
| 638 | module_init(ams369fg06_init); |
| 639 | module_exit(ams369fg06_exit); |
| 640 | |
| 641 | MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); |
| 642 | MODULE_DESCRIPTION("ams369fg06 LCD Driver"); |
| 643 | MODULE_LICENSE("GPL"); |