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]);
222 static int _ams369fg06_gamma_ctl(struct ams369fg06 *lcd,
223 const unsigned int *gamma)
228 for (i = 0 ; i < GAMMA_TABLE_COUNT / 3; i++) {
229 ret = ams369fg06_spi_write(lcd, 0x40 + i, gamma[i]);
230 ret = ams369fg06_spi_write(lcd, 0x50 + i, gamma[i+7*1]);
231 ret = ams369fg06_spi_write(lcd, 0x60 + i, gamma[i+7*2]);
233 dev_err(lcd->dev, "failed to set gamma table.\n");
242 static int ams369fg06_gamma_ctl(struct ams369fg06 *lcd, int brightness)
247 if ((brightness >= 0) && (brightness <= 50))
249 else if ((brightness > 50) && (brightness <= 100))
251 else if ((brightness > 100) && (brightness <= 150))
253 else if ((brightness > 150) && (brightness <= 200))
255 else if ((brightness > 200) && (brightness <= 255))
258 ret = _ams369fg06_gamma_ctl(lcd, gamma_table.gamma_22_table[gamma]);
263 static int ams369fg06_ldi_init(struct ams369fg06 *lcd)
266 static const unsigned short *init_seq[] = {
271 for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
272 ret = ams369fg06_panel_send_sequence(lcd, init_seq[i]);
280 static int ams369fg06_ldi_enable(struct ams369fg06 *lcd)
283 static const unsigned short *init_seq[] = {
288 for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
289 ret = ams369fg06_panel_send_sequence(lcd, init_seq[i]);
297 static int ams369fg06_ldi_disable(struct ams369fg06 *lcd)
301 static const unsigned short *init_seq[] = {
306 for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
307 ret = ams369fg06_panel_send_sequence(lcd, init_seq[i]);
315 static int ams369fg06_power_is_on(int power)
317 return ((power) <= FB_BLANK_NORMAL);
320 static int ams369fg06_power_on(struct ams369fg06 *lcd)
323 struct lcd_platform_data *pd = NULL;
324 struct backlight_device *bd = NULL;
328 dev_err(lcd->dev, "platform data is NULL.\n");
334 dev_err(lcd->dev, "backlight device is NULL.\n");
339 dev_err(lcd->dev, "power_on is NULL.\n");
342 pd->power_on(lcd->ld, 1);
343 msleep(pd->power_on_delay);
347 dev_err(lcd->dev, "reset is NULL.\n");
351 msleep(pd->reset_delay);
354 ret = ams369fg06_ldi_init(lcd);
356 dev_err(lcd->dev, "failed to initialize ldi.\n");
360 ret = ams369fg06_ldi_enable(lcd);
362 dev_err(lcd->dev, "failed to enable ldi.\n");
366 /* set brightness to current value after power on or resume. */
367 ret = ams369fg06_gamma_ctl(lcd, bd->props.brightness);
369 dev_err(lcd->dev, "lcd gamma setting failed.\n");
376 static int ams369fg06_power_off(struct ams369fg06 *lcd)
379 struct lcd_platform_data *pd = NULL;
383 dev_err(lcd->dev, "platform data is NULL\n");
387 ret = ams369fg06_ldi_disable(lcd);
389 dev_err(lcd->dev, "lcd setting failed.\n");
393 msleep(pd->power_off_delay);
396 dev_err(lcd->dev, "power_on is NULL.\n");
399 pd->power_on(lcd->ld, 0);
404 static int ams369fg06_power(struct ams369fg06 *lcd, int power)
408 if (ams369fg06_power_is_on(power) &&
409 !ams369fg06_power_is_on(lcd->power))
410 ret = ams369fg06_power_on(lcd);
411 else if (!ams369fg06_power_is_on(power) &&
412 ams369fg06_power_is_on(lcd->power))
413 ret = ams369fg06_power_off(lcd);
421 static int ams369fg06_get_power(struct lcd_device *ld)
423 struct ams369fg06 *lcd = lcd_get_data(ld);
428 static int ams369fg06_set_power(struct lcd_device *ld, int power)
430 struct ams369fg06 *lcd = lcd_get_data(ld);
432 if (power != FB_BLANK_UNBLANK && power != FB_BLANK_POWERDOWN &&
433 power != FB_BLANK_NORMAL) {
434 dev_err(lcd->dev, "power value should be 0, 1 or 4.\n");
438 return ams369fg06_power(lcd, power);
441 static int ams369fg06_get_brightness(struct backlight_device *bd)
443 return bd->props.brightness;
446 static int ams369fg06_set_brightness(struct backlight_device *bd)
449 int brightness = bd->props.brightness;
450 struct ams369fg06 *lcd = dev_get_drvdata(&bd->dev);
452 if (brightness < MIN_BRIGHTNESS ||
453 brightness > bd->props.max_brightness) {
454 dev_err(&bd->dev, "lcd brightness should be %d to %d.\n",
455 MIN_BRIGHTNESS, MAX_BRIGHTNESS);
459 ret = ams369fg06_gamma_ctl(lcd, bd->props.brightness);
461 dev_err(&bd->dev, "lcd brightness setting failed.\n");
468 static struct lcd_ops ams369fg06_lcd_ops = {
469 .get_power = ams369fg06_get_power,
470 .set_power = ams369fg06_set_power,
473 static const struct backlight_ops ams369fg06_backlight_ops = {
474 .get_brightness = ams369fg06_get_brightness,
475 .update_status = ams369fg06_set_brightness,
478 static int ams369fg06_probe(struct spi_device *spi)
481 struct ams369fg06 *lcd = NULL;
482 struct lcd_device *ld = NULL;
483 struct backlight_device *bd = NULL;
484 struct backlight_properties props;
486 lcd = devm_kzalloc(&spi->dev, sizeof(struct ams369fg06), GFP_KERNEL);
490 /* ams369fg06 lcd panel uses 3-wire 16bits SPI Mode. */
491 spi->bits_per_word = 16;
493 ret = spi_setup(spi);
495 dev_err(&spi->dev, "spi setup failed.\n");
500 lcd->dev = &spi->dev;
502 lcd->lcd_pd = spi->dev.platform_data;
504 dev_err(&spi->dev, "platform data is NULL\n");
508 ld = lcd_device_register("ams369fg06", &spi->dev, lcd,
509 &ams369fg06_lcd_ops);
515 memset(&props, 0, sizeof(struct backlight_properties));
516 props.type = BACKLIGHT_RAW;
517 props.max_brightness = MAX_BRIGHTNESS;
519 bd = backlight_device_register("ams369fg06-bl", &spi->dev, lcd,
520 &ams369fg06_backlight_ops, &props);
523 goto out_lcd_unregister;
526 bd->props.brightness = DEFAULT_BRIGHTNESS;
529 if (!lcd->lcd_pd->lcd_enabled) {
531 * if lcd panel was off from bootloader then
532 * current lcd status is powerdown and then
533 * it enables lcd panel.
535 lcd->power = FB_BLANK_POWERDOWN;
537 ams369fg06_power(lcd, FB_BLANK_UNBLANK);
539 lcd->power = FB_BLANK_UNBLANK;
541 dev_set_drvdata(&spi->dev, lcd);
543 dev_info(&spi->dev, "ams369fg06 panel driver has been probed.\n");
548 lcd_device_unregister(ld);
552 static int ams369fg06_remove(struct spi_device *spi)
554 struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev);
556 ams369fg06_power(lcd, FB_BLANK_POWERDOWN);
557 backlight_device_unregister(lcd->bd);
558 lcd_device_unregister(lcd->ld);
563 #if defined(CONFIG_PM)
564 static unsigned int before_power;
566 static int ams369fg06_suspend(struct spi_device *spi, pm_message_t mesg)
569 struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev);
571 dev_dbg(&spi->dev, "lcd->power = %d\n", lcd->power);
573 before_power = lcd->power;
576 * when lcd panel is suspend, lcd panel becomes off
577 * regardless of status.
579 ret = ams369fg06_power(lcd, FB_BLANK_POWERDOWN);
584 static int ams369fg06_resume(struct spi_device *spi)
587 struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev);
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.
594 if (before_power == FB_BLANK_UNBLANK)
595 lcd->power = FB_BLANK_POWERDOWN;
597 dev_dbg(&spi->dev, "before_power = %d\n", before_power);
599 ret = ams369fg06_power(lcd, before_power);
604 #define ams369fg06_suspend NULL
605 #define ams369fg06_resume NULL
608 static void ams369fg06_shutdown(struct spi_device *spi)
610 struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev);
612 ams369fg06_power(lcd, FB_BLANK_POWERDOWN);
615 static struct spi_driver ams369fg06_driver = {
617 .name = "ams369fg06",
618 .owner = THIS_MODULE,
620 .probe = ams369fg06_probe,
621 .remove = ams369fg06_remove,
622 .shutdown = ams369fg06_shutdown,
623 .suspend = ams369fg06_suspend,
624 .resume = ams369fg06_resume,
627 module_spi_driver(ams369fg06_driver);
629 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
630 MODULE_DESCRIPTION("ams369fg06 LCD Driver");
631 MODULE_LICENSE("GPL");