2 * ams369fg06 AMOLED LCD panel driver.
4 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
5 * Author: Jingoo Han <jg1.han@samsung.com>
7 * Derived from drivers/video/s6e63m0.c
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.
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.
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.
24 #include <linux/wait.h>
25 #include <linux/module.h>
27 #include <linux/delay.h>
28 #include <linux/gpio.h>
29 #include <linux/spi/spi.h>
30 #include <linux/lcd.h>
31 #include <linux/backlight.h>
33 #define SLEEPMSEC 0x1000
35 #define DEFMASK 0xFF00
36 #define COMMAND_ONLY 0xFE
37 #define DATA_ONLY 0xFF
39 #define MAX_GAMMA_LEVEL 5
40 #define GAMMA_TABLE_COUNT 21
42 #define MIN_BRIGHTNESS 0
43 #define MAX_BRIGHTNESS 255
44 #define DEFAULT_BRIGHTNESS 150
48 struct spi_device *spi;
50 struct lcd_device *ld;
51 struct backlight_device *bd;
52 struct lcd_platform_data *lcd_pd;
55 static const unsigned short seq_display_on[] = {
60 static const unsigned short seq_display_off[] = {
65 static const unsigned short seq_stand_by_on[] = {
71 static const unsigned short seq_stand_by_off[] = {
77 static const unsigned short seq_setting[] = {
129 /* gamma value: 2.2 */
130 static const unsigned int ams369fg06_22_250[] = {
131 0x00, 0x3f, 0x2a, 0x27, 0x27, 0x1f, 0x44,
132 0x00, 0x00, 0x17, 0x24, 0x26, 0x1f, 0x43,
133 0x00, 0x3f, 0x2a, 0x25, 0x24, 0x1b, 0x5c,
136 static const unsigned int ams369fg06_22_200[] = {
137 0x00, 0x3f, 0x28, 0x29, 0x27, 0x21, 0x3e,
138 0x00, 0x00, 0x10, 0x25, 0x27, 0x20, 0x3d,
139 0x00, 0x3f, 0x28, 0x27, 0x25, 0x1d, 0x53,
142 static const unsigned int ams369fg06_22_150[] = {
143 0x00, 0x3f, 0x2d, 0x29, 0x28, 0x23, 0x37,
144 0x00, 0x00, 0x0b, 0x25, 0x28, 0x22, 0x36,
145 0x00, 0x3f, 0x2b, 0x28, 0x26, 0x1f, 0x4a,
148 static const unsigned int ams369fg06_22_100[] = {
149 0x00, 0x3f, 0x30, 0x2a, 0x2b, 0x24, 0x2f,
150 0x00, 0x00, 0x00, 0x25, 0x29, 0x24, 0x2e,
151 0x00, 0x3f, 0x2f, 0x29, 0x29, 0x21, 0x3f,
154 static const unsigned int ams369fg06_22_50[] = {
155 0x00, 0x3f, 0x3c, 0x2c, 0x2d, 0x27, 0x24,
156 0x00, 0x00, 0x00, 0x22, 0x2a, 0x27, 0x23,
157 0x00, 0x3f, 0x3b, 0x2c, 0x2b, 0x24, 0x31,
160 struct ams369fg06_gamma {
161 unsigned int *gamma_22_table[MAX_GAMMA_LEVEL];
164 static struct ams369fg06_gamma gamma_table = {
165 .gamma_22_table[0] = (unsigned int *)&ams369fg06_22_50,
166 .gamma_22_table[1] = (unsigned int *)&ams369fg06_22_100,
167 .gamma_22_table[2] = (unsigned int *)&ams369fg06_22_150,
168 .gamma_22_table[3] = (unsigned int *)&ams369fg06_22_200,
169 .gamma_22_table[4] = (unsigned int *)&ams369fg06_22_250,
172 static int ams369fg06_spi_write_byte(struct ams369fg06 *lcd, int addr, int data)
175 struct spi_message msg;
177 struct spi_transfer xfer = {
182 buf[0] = (addr << 8) | data;
184 spi_message_init(&msg);
185 spi_message_add_tail(&xfer, &msg);
187 return spi_sync(lcd->spi, &msg);
190 static int ams369fg06_spi_write(struct ams369fg06 *lcd, unsigned char address,
191 unsigned char command)
195 if (address != DATA_ONLY)
196 ret = ams369fg06_spi_write_byte(lcd, 0x70, address);
197 if (command != COMMAND_ONLY)
198 ret = ams369fg06_spi_write_byte(lcd, 0x72, command);
203 static int ams369fg06_panel_send_sequence(struct ams369fg06 *lcd,
204 const unsigned short *wbuf)
208 while ((wbuf[i] & DEFMASK) != ENDDEF) {
209 if ((wbuf[i] & DEFMASK) != SLEEPMSEC) {
210 ret = ams369fg06_spi_write(lcd, wbuf[i], wbuf[i+1]);
221 static int _ams369fg06_gamma_ctl(struct ams369fg06 *lcd,
222 const unsigned int *gamma)
227 for (i = 0 ; i < GAMMA_TABLE_COUNT / 3; i++) {
228 ret = ams369fg06_spi_write(lcd, 0x40 + i, gamma[i]);
229 ret = ams369fg06_spi_write(lcd, 0x50 + i, gamma[i+7*1]);
230 ret = ams369fg06_spi_write(lcd, 0x60 + i, gamma[i+7*2]);
232 dev_err(lcd->dev, "failed to set gamma table.\n");
241 static int ams369fg06_gamma_ctl(struct ams369fg06 *lcd, int brightness)
246 if ((brightness >= 0) && (brightness <= 50))
248 else if ((brightness > 50) && (brightness <= 100))
250 else if ((brightness > 100) && (brightness <= 150))
252 else if ((brightness > 150) && (brightness <= 200))
254 else if ((brightness > 200) && (brightness <= 255))
257 ret = _ams369fg06_gamma_ctl(lcd, gamma_table.gamma_22_table[gamma]);
262 static int ams369fg06_ldi_init(struct ams369fg06 *lcd)
265 static const unsigned short *init_seq[] = {
270 for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
271 ret = ams369fg06_panel_send_sequence(lcd, init_seq[i]);
279 static int ams369fg06_ldi_enable(struct ams369fg06 *lcd)
282 static const unsigned short *init_seq[] = {
287 for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
288 ret = ams369fg06_panel_send_sequence(lcd, init_seq[i]);
296 static int ams369fg06_ldi_disable(struct ams369fg06 *lcd)
300 static const unsigned short *init_seq[] = {
305 for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
306 ret = ams369fg06_panel_send_sequence(lcd, init_seq[i]);
314 static int ams369fg06_power_is_on(int power)
316 return ((power) <= FB_BLANK_NORMAL);
319 static int ams369fg06_power_on(struct ams369fg06 *lcd)
322 struct lcd_platform_data *pd = NULL;
323 struct backlight_device *bd = NULL;
327 dev_err(lcd->dev, "platform data is NULL.\n");
333 dev_err(lcd->dev, "backlight device is NULL.\n");
338 dev_err(lcd->dev, "power_on is NULL.\n");
341 pd->power_on(lcd->ld, 1);
342 mdelay(pd->power_on_delay);
346 dev_err(lcd->dev, "reset is NULL.\n");
350 mdelay(pd->reset_delay);
353 ret = ams369fg06_ldi_init(lcd);
355 dev_err(lcd->dev, "failed to initialize ldi.\n");
359 ret = ams369fg06_ldi_enable(lcd);
361 dev_err(lcd->dev, "failed to enable ldi.\n");
365 /* set brightness to current value after power on or resume. */
366 ret = ams369fg06_gamma_ctl(lcd, bd->props.brightness);
368 dev_err(lcd->dev, "lcd gamma setting failed.\n");
375 static int ams369fg06_power_off(struct ams369fg06 *lcd)
378 struct lcd_platform_data *pd = NULL;
382 dev_err(lcd->dev, "platform data is NULL\n");
386 ret = ams369fg06_ldi_disable(lcd);
388 dev_err(lcd->dev, "lcd setting failed.\n");
392 mdelay(pd->power_off_delay);
395 dev_err(lcd->dev, "power_on is NULL.\n");
398 pd->power_on(lcd->ld, 0);
403 static int ams369fg06_power(struct ams369fg06 *lcd, int power)
407 if (ams369fg06_power_is_on(power) &&
408 !ams369fg06_power_is_on(lcd->power))
409 ret = ams369fg06_power_on(lcd);
410 else if (!ams369fg06_power_is_on(power) &&
411 ams369fg06_power_is_on(lcd->power))
412 ret = ams369fg06_power_off(lcd);
420 static int ams369fg06_get_power(struct lcd_device *ld)
422 struct ams369fg06 *lcd = lcd_get_data(ld);
427 static int ams369fg06_set_power(struct lcd_device *ld, int power)
429 struct ams369fg06 *lcd = lcd_get_data(ld);
431 if (power != FB_BLANK_UNBLANK && power != FB_BLANK_POWERDOWN &&
432 power != FB_BLANK_NORMAL) {
433 dev_err(lcd->dev, "power value should be 0, 1 or 4.\n");
437 return ams369fg06_power(lcd, power);
440 static int ams369fg06_get_brightness(struct backlight_device *bd)
442 return bd->props.brightness;
445 static int ams369fg06_set_brightness(struct backlight_device *bd)
448 int brightness = bd->props.brightness;
449 struct ams369fg06 *lcd = dev_get_drvdata(&bd->dev);
451 if (brightness < MIN_BRIGHTNESS ||
452 brightness > bd->props.max_brightness) {
453 dev_err(&bd->dev, "lcd brightness should be %d to %d.\n",
454 MIN_BRIGHTNESS, MAX_BRIGHTNESS);
458 ret = ams369fg06_gamma_ctl(lcd, bd->props.brightness);
460 dev_err(&bd->dev, "lcd brightness setting failed.\n");
467 static struct lcd_ops ams369fg06_lcd_ops = {
468 .get_power = ams369fg06_get_power,
469 .set_power = ams369fg06_set_power,
472 static const struct backlight_ops ams369fg06_backlight_ops = {
473 .get_brightness = ams369fg06_get_brightness,
474 .update_status = ams369fg06_set_brightness,
477 static int __devinit ams369fg06_probe(struct spi_device *spi)
480 struct ams369fg06 *lcd = NULL;
481 struct lcd_device *ld = NULL;
482 struct backlight_device *bd = NULL;
483 struct backlight_properties props;
485 lcd = devm_kzalloc(&spi->dev, sizeof(struct ams369fg06), GFP_KERNEL);
489 /* ams369fg06 lcd panel uses 3-wire 16bits SPI Mode. */
490 spi->bits_per_word = 16;
492 ret = spi_setup(spi);
494 dev_err(&spi->dev, "spi setup failed.\n");
499 lcd->dev = &spi->dev;
501 lcd->lcd_pd = spi->dev.platform_data;
503 dev_err(&spi->dev, "platform data is NULL\n");
507 ld = lcd_device_register("ams369fg06", &spi->dev, lcd,
508 &ams369fg06_lcd_ops);
514 memset(&props, 0, sizeof(struct backlight_properties));
515 props.type = BACKLIGHT_RAW;
516 props.max_brightness = MAX_BRIGHTNESS;
518 bd = backlight_device_register("ams369fg06-bl", &spi->dev, lcd,
519 &ams369fg06_backlight_ops, &props);
522 goto out_lcd_unregister;
525 bd->props.brightness = DEFAULT_BRIGHTNESS;
528 if (!lcd->lcd_pd->lcd_enabled) {
530 * if lcd panel was off from bootloader then
531 * current lcd status is powerdown and then
532 * it enables lcd panel.
534 lcd->power = FB_BLANK_POWERDOWN;
536 ams369fg06_power(lcd, FB_BLANK_UNBLANK);
538 lcd->power = FB_BLANK_UNBLANK;
540 dev_set_drvdata(&spi->dev, lcd);
542 dev_info(&spi->dev, "ams369fg06 panel driver has been probed.\n");
547 lcd_device_unregister(ld);
551 static int __devexit ams369fg06_remove(struct spi_device *spi)
553 struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev);
555 ams369fg06_power(lcd, FB_BLANK_POWERDOWN);
556 backlight_device_unregister(lcd->bd);
557 lcd_device_unregister(lcd->ld);
562 #if defined(CONFIG_PM)
563 static unsigned int before_power;
565 static int ams369fg06_suspend(struct spi_device *spi, pm_message_t mesg)
568 struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev);
570 dev_dbg(&spi->dev, "lcd->power = %d\n", lcd->power);
572 before_power = lcd->power;
575 * when lcd panel is suspend, lcd panel becomes off
576 * regardless of status.
578 ret = ams369fg06_power(lcd, FB_BLANK_POWERDOWN);
583 static int ams369fg06_resume(struct spi_device *spi)
586 struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev);
589 * after suspended, if lcd panel status is FB_BLANK_UNBLANK
590 * (at that time, before_power is FB_BLANK_UNBLANK) then
591 * it changes that status to FB_BLANK_POWERDOWN to get lcd on.
593 if (before_power == FB_BLANK_UNBLANK)
594 lcd->power = FB_BLANK_POWERDOWN;
596 dev_dbg(&spi->dev, "before_power = %d\n", before_power);
598 ret = ams369fg06_power(lcd, before_power);
603 #define ams369fg06_suspend NULL
604 #define ams369fg06_resume NULL
607 static void ams369fg06_shutdown(struct spi_device *spi)
609 struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev);
611 ams369fg06_power(lcd, FB_BLANK_POWERDOWN);
614 static struct spi_driver ams369fg06_driver = {
616 .name = "ams369fg06",
617 .owner = THIS_MODULE,
619 .probe = ams369fg06_probe,
620 .remove = __devexit_p(ams369fg06_remove),
621 .shutdown = ams369fg06_shutdown,
622 .suspend = ams369fg06_suspend,
623 .resume = ams369fg06_resume,
626 module_spi_driver(ams369fg06_driver);
628 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
629 MODULE_DESCRIPTION("ams369fg06 LCD Driver");
630 MODULE_LICENSE("GPL");