812 lines
15 KiB
C
812 lines
15 KiB
C
/*
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* ld9040 AMOLED LCD panel driver.
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*
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* Copyright (c) 2011 Samsung Electronics
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* Author: Donghwa Lee <dh09.lee@samsung.com>
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* Derived from drivers/video/backlight/s6e63m0.c
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/backlight.h>
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#include <linux/delay.h>
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#include <linux/fb.h>
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#include <linux/gpio.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/kernel.h>
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#include <linux/lcd.h>
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#include <linux/module.h>
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#include <linux/regulator/consumer.h>
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#include <linux/spi/spi.h>
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#include <linux/wait.h>
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#include "ld9040_gamma.h"
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#define SLEEPMSEC 0x1000
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#define ENDDEF 0x2000
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#define DEFMASK 0xFF00
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#define COMMAND_ONLY 0xFE
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#define DATA_ONLY 0xFF
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#define MIN_BRIGHTNESS 0
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#define MAX_BRIGHTNESS 24
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struct ld9040 {
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struct device *dev;
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struct spi_device *spi;
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unsigned int power;
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unsigned int current_brightness;
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struct lcd_device *ld;
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struct backlight_device *bd;
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struct lcd_platform_data *lcd_pd;
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struct mutex lock;
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bool enabled;
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};
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static struct regulator_bulk_data supplies[] = {
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{ .supply = "vdd3", },
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{ .supply = "vci", },
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};
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static void ld9040_regulator_enable(struct ld9040 *lcd)
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{
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int ret = 0;
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struct lcd_platform_data *pd = NULL;
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pd = lcd->lcd_pd;
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mutex_lock(&lcd->lock);
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if (!lcd->enabled) {
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ret = regulator_bulk_enable(ARRAY_SIZE(supplies), supplies);
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if (ret)
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goto out;
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lcd->enabled = true;
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}
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msleep(pd->power_on_delay);
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out:
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mutex_unlock(&lcd->lock);
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}
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static void ld9040_regulator_disable(struct ld9040 *lcd)
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{
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int ret = 0;
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mutex_lock(&lcd->lock);
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if (lcd->enabled) {
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ret = regulator_bulk_disable(ARRAY_SIZE(supplies), supplies);
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if (ret)
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goto out;
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lcd->enabled = false;
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}
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out:
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mutex_unlock(&lcd->lock);
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}
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static const unsigned short seq_swreset[] = {
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0x01, COMMAND_ONLY,
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ENDDEF, 0x00
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};
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static const unsigned short seq_user_setting[] = {
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0xF0, 0x5A,
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DATA_ONLY, 0x5A,
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ENDDEF, 0x00
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};
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static const unsigned short seq_elvss_on[] = {
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0xB1, 0x0D,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x16,
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ENDDEF, 0x00
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};
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static const unsigned short seq_gtcon[] = {
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0xF7, 0x09,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x00,
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ENDDEF, 0x00
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};
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static const unsigned short seq_panel_condition[] = {
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0xF8, 0x05,
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DATA_ONLY, 0x65,
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DATA_ONLY, 0x96,
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DATA_ONLY, 0x71,
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DATA_ONLY, 0x7D,
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DATA_ONLY, 0x19,
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DATA_ONLY, 0x3B,
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DATA_ONLY, 0x0D,
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DATA_ONLY, 0x19,
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DATA_ONLY, 0x7E,
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DATA_ONLY, 0x0D,
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DATA_ONLY, 0xE2,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x7E,
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DATA_ONLY, 0x7D,
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DATA_ONLY, 0x07,
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DATA_ONLY, 0x07,
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DATA_ONLY, 0x20,
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DATA_ONLY, 0x20,
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DATA_ONLY, 0x20,
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DATA_ONLY, 0x02,
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DATA_ONLY, 0x02,
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ENDDEF, 0x00
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};
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static const unsigned short seq_gamma_set1[] = {
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0xF9, 0x00,
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DATA_ONLY, 0xA7,
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DATA_ONLY, 0xB4,
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DATA_ONLY, 0xAE,
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DATA_ONLY, 0xBF,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x91,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0xB2,
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DATA_ONLY, 0xB4,
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DATA_ONLY, 0xAA,
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DATA_ONLY, 0xBB,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0xAC,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0xB3,
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DATA_ONLY, 0xB1,
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DATA_ONLY, 0xAA,
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DATA_ONLY, 0xBC,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0xB3,
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ENDDEF, 0x00
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};
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static const unsigned short seq_gamma_ctrl[] = {
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0xFB, 0x02,
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DATA_ONLY, 0x5A,
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ENDDEF, 0x00
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};
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static const unsigned short seq_gamma_start[] = {
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0xF9, COMMAND_ONLY,
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ENDDEF, 0x00
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};
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static const unsigned short seq_apon[] = {
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0xF3, 0x00,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x0A,
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DATA_ONLY, 0x02,
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ENDDEF, 0x00
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};
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static const unsigned short seq_display_ctrl[] = {
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0xF2, 0x02,
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DATA_ONLY, 0x08,
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DATA_ONLY, 0x08,
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DATA_ONLY, 0x10,
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DATA_ONLY, 0x10,
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ENDDEF, 0x00
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};
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static const unsigned short seq_manual_pwr[] = {
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0xB0, 0x04,
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ENDDEF, 0x00
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};
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static const unsigned short seq_pwr_ctrl[] = {
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0xF4, 0x0A,
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DATA_ONLY, 0x87,
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DATA_ONLY, 0x25,
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DATA_ONLY, 0x6A,
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DATA_ONLY, 0x44,
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DATA_ONLY, 0x02,
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DATA_ONLY, 0x88,
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ENDDEF, 0x00
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};
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static const unsigned short seq_sleep_out[] = {
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0x11, COMMAND_ONLY,
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ENDDEF, 0x00
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};
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static const unsigned short seq_sleep_in[] = {
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0x10, COMMAND_ONLY,
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ENDDEF, 0x00
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};
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static const unsigned short seq_display_on[] = {
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0x29, COMMAND_ONLY,
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ENDDEF, 0x00
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};
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static const unsigned short seq_display_off[] = {
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0x28, COMMAND_ONLY,
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ENDDEF, 0x00
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};
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static const unsigned short seq_vci1_1st_en[] = {
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0xF3, 0x10,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x02,
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ENDDEF, 0x00
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};
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static const unsigned short seq_vl1_en[] = {
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0xF3, 0x11,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x02,
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ENDDEF, 0x00
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};
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static const unsigned short seq_vl2_en[] = {
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0xF3, 0x13,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x02,
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ENDDEF, 0x00
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};
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static const unsigned short seq_vci1_2nd_en[] = {
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0xF3, 0x33,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x02,
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ENDDEF, 0x00
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};
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static const unsigned short seq_vl3_en[] = {
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0xF3, 0x37,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x02,
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ENDDEF, 0x00
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};
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static const unsigned short seq_vreg1_amp_en[] = {
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0xF3, 0x37,
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DATA_ONLY, 0x01,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x02,
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ENDDEF, 0x00
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};
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static const unsigned short seq_vgh_amp_en[] = {
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0xF3, 0x37,
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DATA_ONLY, 0x11,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x02,
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ENDDEF, 0x00
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};
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static const unsigned short seq_vgl_amp_en[] = {
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0xF3, 0x37,
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DATA_ONLY, 0x31,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x02,
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ENDDEF, 0x00
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};
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static const unsigned short seq_vmos_amp_en[] = {
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0xF3, 0x37,
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DATA_ONLY, 0xB1,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x03,
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ENDDEF, 0x00
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};
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static const unsigned short seq_vint_amp_en[] = {
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0xF3, 0x37,
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DATA_ONLY, 0xF1,
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/* DATA_ONLY, 0x71, VMOS/VBL/VBH not used */
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x03,
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/* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
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ENDDEF, 0x00
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};
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static const unsigned short seq_vbh_amp_en[] = {
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0xF3, 0x37,
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DATA_ONLY, 0xF9,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x03,
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ENDDEF, 0x00
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};
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static const unsigned short seq_vbl_amp_en[] = {
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0xF3, 0x37,
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DATA_ONLY, 0xFD,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x03,
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ENDDEF, 0x00
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};
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static const unsigned short seq_gam_amp_en[] = {
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0xF3, 0x37,
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DATA_ONLY, 0xFF,
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/* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x03,
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/* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
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ENDDEF, 0x00
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};
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static const unsigned short seq_sd_amp_en[] = {
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0xF3, 0x37,
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DATA_ONLY, 0xFF,
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/* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */
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DATA_ONLY, 0x80,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x03,
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/* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
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ENDDEF, 0x00
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};
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static const unsigned short seq_gls_en[] = {
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0xF3, 0x37,
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DATA_ONLY, 0xFF,
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/* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */
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DATA_ONLY, 0x81,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x03,
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/* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
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ENDDEF, 0x00
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};
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static const unsigned short seq_els_en[] = {
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0xF3, 0x37,
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DATA_ONLY, 0xFF,
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/* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */
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DATA_ONLY, 0x83,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x03,
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/* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
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ENDDEF, 0x00
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};
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static const unsigned short seq_el_on[] = {
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0xF3, 0x37,
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DATA_ONLY, 0xFF,
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/* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */
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DATA_ONLY, 0x87,
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DATA_ONLY, 0x00,
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DATA_ONLY, 0x03,
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/* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
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ENDDEF, 0x00
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};
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static int ld9040_spi_write_byte(struct ld9040 *lcd, int addr, int data)
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{
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u16 buf[1];
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struct spi_message msg;
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struct spi_transfer xfer = {
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.len = 2,
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.tx_buf = buf,
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};
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buf[0] = (addr << 8) | data;
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spi_message_init(&msg);
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spi_message_add_tail(&xfer, &msg);
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return spi_sync(lcd->spi, &msg);
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}
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static int ld9040_spi_write(struct ld9040 *lcd, unsigned char address,
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unsigned char command)
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{
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int ret = 0;
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if (address != DATA_ONLY)
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ret = ld9040_spi_write_byte(lcd, 0x0, address);
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if (command != COMMAND_ONLY)
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ret = ld9040_spi_write_byte(lcd, 0x1, command);
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return ret;
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}
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static int ld9040_panel_send_sequence(struct ld9040 *lcd,
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const unsigned short *wbuf)
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{
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int ret = 0, i = 0;
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while ((wbuf[i] & DEFMASK) != ENDDEF) {
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if ((wbuf[i] & DEFMASK) != SLEEPMSEC) {
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ret = ld9040_spi_write(lcd, wbuf[i], wbuf[i+1]);
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if (ret)
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break;
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} else {
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msleep(wbuf[i+1]);
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}
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i += 2;
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}
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return ret;
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}
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static int _ld9040_gamma_ctl(struct ld9040 *lcd, const unsigned int *gamma)
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{
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unsigned int i = 0;
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int ret = 0;
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/* start gamma table updating. */
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ret = ld9040_panel_send_sequence(lcd, seq_gamma_start);
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if (ret) {
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dev_err(lcd->dev, "failed to disable gamma table updating.\n");
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goto gamma_err;
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}
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for (i = 0 ; i < GAMMA_TABLE_COUNT; i++) {
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ret = ld9040_spi_write(lcd, DATA_ONLY, gamma[i]);
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if (ret) {
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dev_err(lcd->dev, "failed to set gamma table.\n");
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goto gamma_err;
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}
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}
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/* update gamma table. */
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ret = ld9040_panel_send_sequence(lcd, seq_gamma_ctrl);
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if (ret)
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dev_err(lcd->dev, "failed to update gamma table.\n");
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gamma_err:
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return ret;
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}
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static int ld9040_gamma_ctl(struct ld9040 *lcd, int gamma)
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{
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return _ld9040_gamma_ctl(lcd, gamma_table.gamma_22_table[gamma]);
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}
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static int ld9040_ldi_init(struct ld9040 *lcd)
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{
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int ret, i;
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static const unsigned short *init_seq[] = {
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seq_user_setting,
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seq_panel_condition,
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seq_display_ctrl,
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seq_manual_pwr,
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seq_elvss_on,
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seq_gtcon,
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seq_gamma_set1,
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seq_gamma_ctrl,
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seq_sleep_out,
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};
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for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
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ret = ld9040_panel_send_sequence(lcd, init_seq[i]);
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/* workaround: minimum delay time for transferring CMD */
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usleep_range(300, 310);
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if (ret)
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break;
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}
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return ret;
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}
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static int ld9040_ldi_enable(struct ld9040 *lcd)
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{
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return ld9040_panel_send_sequence(lcd, seq_display_on);
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}
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static int ld9040_ldi_disable(struct ld9040 *lcd)
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{
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int ret;
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ret = ld9040_panel_send_sequence(lcd, seq_display_off);
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ret = ld9040_panel_send_sequence(lcd, seq_sleep_in);
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return ret;
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}
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static int ld9040_power_is_on(int power)
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{
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return power <= FB_BLANK_NORMAL;
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}
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static int ld9040_power_on(struct ld9040 *lcd)
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{
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int ret = 0;
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struct lcd_platform_data *pd;
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pd = lcd->lcd_pd;
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/* lcd power on */
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ld9040_regulator_enable(lcd);
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if (!pd->reset) {
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dev_err(lcd->dev, "reset is NULL.\n");
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return -EINVAL;
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}
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|
|
|
pd->reset(lcd->ld);
|
|
msleep(pd->reset_delay);
|
|
|
|
ret = ld9040_ldi_init(lcd);
|
|
if (ret) {
|
|
dev_err(lcd->dev, "failed to initialize ldi.\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = ld9040_ldi_enable(lcd);
|
|
if (ret) {
|
|
dev_err(lcd->dev, "failed to enable ldi.\n");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ld9040_power_off(struct ld9040 *lcd)
|
|
{
|
|
int ret;
|
|
struct lcd_platform_data *pd;
|
|
|
|
pd = lcd->lcd_pd;
|
|
|
|
ret = ld9040_ldi_disable(lcd);
|
|
if (ret) {
|
|
dev_err(lcd->dev, "lcd setting failed.\n");
|
|
return -EIO;
|
|
}
|
|
|
|
msleep(pd->power_off_delay);
|
|
|
|
/* lcd power off */
|
|
ld9040_regulator_disable(lcd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ld9040_power(struct ld9040 *lcd, int power)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (ld9040_power_is_on(power) && !ld9040_power_is_on(lcd->power))
|
|
ret = ld9040_power_on(lcd);
|
|
else if (!ld9040_power_is_on(power) && ld9040_power_is_on(lcd->power))
|
|
ret = ld9040_power_off(lcd);
|
|
|
|
if (!ret)
|
|
lcd->power = power;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ld9040_set_power(struct lcd_device *ld, int power)
|
|
{
|
|
struct ld9040 *lcd = lcd_get_data(ld);
|
|
|
|
if (power != FB_BLANK_UNBLANK && power != FB_BLANK_POWERDOWN &&
|
|
power != FB_BLANK_NORMAL) {
|
|
dev_err(lcd->dev, "power value should be 0, 1 or 4.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return ld9040_power(lcd, power);
|
|
}
|
|
|
|
static int ld9040_get_power(struct lcd_device *ld)
|
|
{
|
|
struct ld9040 *lcd = lcd_get_data(ld);
|
|
|
|
return lcd->power;
|
|
}
|
|
|
|
static int ld9040_set_brightness(struct backlight_device *bd)
|
|
{
|
|
int ret = 0, brightness = bd->props.brightness;
|
|
struct ld9040 *lcd = bl_get_data(bd);
|
|
|
|
if (brightness < MIN_BRIGHTNESS ||
|
|
brightness > bd->props.max_brightness) {
|
|
dev_err(&bd->dev, "lcd brightness should be %d to %d.\n",
|
|
MIN_BRIGHTNESS, MAX_BRIGHTNESS);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = ld9040_gamma_ctl(lcd, bd->props.brightness);
|
|
if (ret) {
|
|
dev_err(&bd->dev, "lcd brightness setting failed.\n");
|
|
return -EIO;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct lcd_ops ld9040_lcd_ops = {
|
|
.set_power = ld9040_set_power,
|
|
.get_power = ld9040_get_power,
|
|
};
|
|
|
|
static const struct backlight_ops ld9040_backlight_ops = {
|
|
.update_status = ld9040_set_brightness,
|
|
};
|
|
|
|
static int ld9040_probe(struct spi_device *spi)
|
|
{
|
|
int ret = 0;
|
|
struct ld9040 *lcd = NULL;
|
|
struct lcd_device *ld = NULL;
|
|
struct backlight_device *bd = NULL;
|
|
struct backlight_properties props;
|
|
|
|
lcd = devm_kzalloc(&spi->dev, sizeof(struct ld9040), GFP_KERNEL);
|
|
if (!lcd)
|
|
return -ENOMEM;
|
|
|
|
/* ld9040 lcd panel uses 3-wire 9bits SPI Mode. */
|
|
spi->bits_per_word = 9;
|
|
|
|
ret = spi_setup(spi);
|
|
if (ret < 0) {
|
|
dev_err(&spi->dev, "spi setup failed.\n");
|
|
return ret;
|
|
}
|
|
|
|
lcd->spi = spi;
|
|
lcd->dev = &spi->dev;
|
|
|
|
lcd->lcd_pd = dev_get_platdata(&spi->dev);
|
|
if (!lcd->lcd_pd) {
|
|
dev_err(&spi->dev, "platform data is NULL.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
mutex_init(&lcd->lock);
|
|
|
|
ret = devm_regulator_bulk_get(lcd->dev, ARRAY_SIZE(supplies), supplies);
|
|
if (ret) {
|
|
dev_err(lcd->dev, "Failed to get regulators: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ld = devm_lcd_device_register(&spi->dev, "ld9040", &spi->dev, lcd,
|
|
&ld9040_lcd_ops);
|
|
if (IS_ERR(ld))
|
|
return PTR_ERR(ld);
|
|
|
|
lcd->ld = ld;
|
|
|
|
memset(&props, 0, sizeof(struct backlight_properties));
|
|
props.type = BACKLIGHT_RAW;
|
|
props.max_brightness = MAX_BRIGHTNESS;
|
|
|
|
bd = devm_backlight_device_register(&spi->dev, "ld9040-bl", &spi->dev,
|
|
lcd, &ld9040_backlight_ops, &props);
|
|
if (IS_ERR(bd))
|
|
return PTR_ERR(bd);
|
|
|
|
bd->props.brightness = MAX_BRIGHTNESS;
|
|
lcd->bd = bd;
|
|
|
|
/*
|
|
* if lcd panel was on from bootloader like u-boot then
|
|
* do not lcd on.
|
|
*/
|
|
if (!lcd->lcd_pd->lcd_enabled) {
|
|
/*
|
|
* if lcd panel was off from bootloader then
|
|
* current lcd status is powerdown and then
|
|
* it enables lcd panel.
|
|
*/
|
|
lcd->power = FB_BLANK_POWERDOWN;
|
|
|
|
ld9040_power(lcd, FB_BLANK_UNBLANK);
|
|
} else {
|
|
lcd->power = FB_BLANK_UNBLANK;
|
|
}
|
|
|
|
spi_set_drvdata(spi, lcd);
|
|
|
|
dev_info(&spi->dev, "ld9040 panel driver has been probed.\n");
|
|
return 0;
|
|
}
|
|
|
|
static int ld9040_remove(struct spi_device *spi)
|
|
{
|
|
struct ld9040 *lcd = spi_get_drvdata(spi);
|
|
|
|
ld9040_power(lcd, FB_BLANK_POWERDOWN);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int ld9040_suspend(struct device *dev)
|
|
{
|
|
struct ld9040 *lcd = dev_get_drvdata(dev);
|
|
|
|
dev_dbg(dev, "lcd->power = %d\n", lcd->power);
|
|
|
|
/*
|
|
* when lcd panel is suspend, lcd panel becomes off
|
|
* regardless of status.
|
|
*/
|
|
return ld9040_power(lcd, FB_BLANK_POWERDOWN);
|
|
}
|
|
|
|
static int ld9040_resume(struct device *dev)
|
|
{
|
|
struct ld9040 *lcd = dev_get_drvdata(dev);
|
|
|
|
lcd->power = FB_BLANK_POWERDOWN;
|
|
|
|
return ld9040_power(lcd, FB_BLANK_UNBLANK);
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(ld9040_pm_ops, ld9040_suspend, ld9040_resume);
|
|
|
|
/* Power down all displays on reboot, poweroff or halt. */
|
|
static void ld9040_shutdown(struct spi_device *spi)
|
|
{
|
|
struct ld9040 *lcd = spi_get_drvdata(spi);
|
|
|
|
ld9040_power(lcd, FB_BLANK_POWERDOWN);
|
|
}
|
|
|
|
static struct spi_driver ld9040_driver = {
|
|
.driver = {
|
|
.name = "ld9040",
|
|
.pm = &ld9040_pm_ops,
|
|
},
|
|
.probe = ld9040_probe,
|
|
.remove = ld9040_remove,
|
|
.shutdown = ld9040_shutdown,
|
|
};
|
|
|
|
module_spi_driver(ld9040_driver);
|
|
|
|
MODULE_AUTHOR("Donghwa Lee <dh09.lee@samsung.com>");
|
|
MODULE_DESCRIPTION("ld9040 LCD Driver");
|
|
MODULE_LICENSE("GPL");
|