/* * ld9040 AMOLED LCD panel driver. * * Copyright (c) 2011 Samsung Electronics * Author: Donghwa Lee <dh09.lee@samsung.com> * Derived from drivers/video/backlight/s6e63m0.c * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. */ #include <linux/backlight.h> #include <linux/delay.h> #include <linux/fb.h> #include <linux/gpio.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/kernel.h> #include <linux/lcd.h> #include <linux/module.h> #include <linux/regulator/consumer.h> #include <linux/spi/spi.h> #include <linux/wait.h> #include "ld9040_gamma.h" #define SLEEPMSEC 0x1000 #define ENDDEF 0x2000 #define DEFMASK 0xFF00 #define COMMAND_ONLY 0xFE #define DATA_ONLY 0xFF #define MIN_BRIGHTNESS 0 #define MAX_BRIGHTNESS 24 struct ld9040 { struct device *dev; struct spi_device *spi; unsigned int power; unsigned int current_brightness; struct lcd_device *ld; struct backlight_device *bd; struct lcd_platform_data *lcd_pd; struct mutex lock; bool enabled; }; static struct regulator_bulk_data supplies[] = { { .supply = "vdd3", }, { .supply = "vci", }, }; static void ld9040_regulator_enable(struct ld9040 *lcd) { int ret = 0; struct lcd_platform_data *pd = NULL; pd = lcd->lcd_pd; mutex_lock(&lcd->lock); if (!lcd->enabled) { ret = regulator_bulk_enable(ARRAY_SIZE(supplies), supplies); if (ret) goto out; lcd->enabled = true; } msleep(pd->power_on_delay); out: mutex_unlock(&lcd->lock); } static void ld9040_regulator_disable(struct ld9040 *lcd) { int ret = 0; mutex_lock(&lcd->lock); if (lcd->enabled) { ret = regulator_bulk_disable(ARRAY_SIZE(supplies), supplies); if (ret) goto out; lcd->enabled = false; } out: mutex_unlock(&lcd->lock); } static const unsigned short seq_swreset[] = { 0x01, COMMAND_ONLY, ENDDEF, 0x00 }; static const unsigned short seq_user_setting[] = { 0xF0, 0x5A, DATA_ONLY, 0x5A, ENDDEF, 0x00 }; static const unsigned short seq_elvss_on[] = { 0xB1, 0x0D, DATA_ONLY, 0x00, DATA_ONLY, 0x16, ENDDEF, 0x00 }; static const unsigned short seq_gtcon[] = { 0xF7, 0x09, DATA_ONLY, 0x00, DATA_ONLY, 0x00, ENDDEF, 0x00 }; static const unsigned short seq_panel_condition[] = { 0xF8, 0x05, DATA_ONLY, 0x65, DATA_ONLY, 0x96, DATA_ONLY, 0x71, DATA_ONLY, 0x7D, DATA_ONLY, 0x19, DATA_ONLY, 0x3B, DATA_ONLY, 0x0D, DATA_ONLY, 0x19, DATA_ONLY, 0x7E, DATA_ONLY, 0x0D, DATA_ONLY, 0xE2, DATA_ONLY, 0x00, DATA_ONLY, 0x00, DATA_ONLY, 0x7E, DATA_ONLY, 0x7D, DATA_ONLY, 0x07, DATA_ONLY, 0x07, DATA_ONLY, 0x20, DATA_ONLY, 0x20, DATA_ONLY, 0x20, DATA_ONLY, 0x02, DATA_ONLY, 0x02, ENDDEF, 0x00 }; static const unsigned short seq_gamma_set1[] = { 0xF9, 0x00, DATA_ONLY, 0xA7, DATA_ONLY, 0xB4, DATA_ONLY, 0xAE, DATA_ONLY, 0xBF, DATA_ONLY, 0x00, DATA_ONLY, 0x91, DATA_ONLY, 0x00, DATA_ONLY, 0xB2, DATA_ONLY, 0xB4, DATA_ONLY, 0xAA, DATA_ONLY, 0xBB, DATA_ONLY, 0x00, DATA_ONLY, 0xAC, DATA_ONLY, 0x00, DATA_ONLY, 0xB3, DATA_ONLY, 0xB1, DATA_ONLY, 0xAA, DATA_ONLY, 0xBC, DATA_ONLY, 0x00, DATA_ONLY, 0xB3, ENDDEF, 0x00 }; static const unsigned short seq_gamma_ctrl[] = { 0xFB, 0x02, DATA_ONLY, 0x5A, ENDDEF, 0x00 }; static const unsigned short seq_gamma_start[] = { 0xF9, COMMAND_ONLY, ENDDEF, 0x00 }; static const unsigned short seq_apon[] = { 0xF3, 0x00, DATA_ONLY, 0x00, DATA_ONLY, 0x00, DATA_ONLY, 0x0A, DATA_ONLY, 0x02, ENDDEF, 0x00 }; static const unsigned short seq_display_ctrl[] = { 0xF2, 0x02, DATA_ONLY, 0x08, DATA_ONLY, 0x08, DATA_ONLY, 0x10, DATA_ONLY, 0x10, ENDDEF, 0x00 }; static const unsigned short seq_manual_pwr[] = { 0xB0, 0x04, ENDDEF, 0x00 }; static const unsigned short seq_pwr_ctrl[] = { 0xF4, 0x0A, DATA_ONLY, 0x87, DATA_ONLY, 0x25, DATA_ONLY, 0x6A, DATA_ONLY, 0x44, DATA_ONLY, 0x02, DATA_ONLY, 0x88, ENDDEF, 0x00 }; static const unsigned short seq_sleep_out[] = { 0x11, COMMAND_ONLY, ENDDEF, 0x00 }; static const unsigned short seq_sleep_in[] = { 0x10, COMMAND_ONLY, ENDDEF, 0x00 }; static const unsigned short seq_display_on[] = { 0x29, COMMAND_ONLY, ENDDEF, 0x00 }; static const unsigned short seq_display_off[] = { 0x28, COMMAND_ONLY, ENDDEF, 0x00 }; static const unsigned short seq_vci1_1st_en[] = { 0xF3, 0x10, DATA_ONLY, 0x00, DATA_ONLY, 0x00, DATA_ONLY, 0x00, DATA_ONLY, 0x02, ENDDEF, 0x00 }; static const unsigned short seq_vl1_en[] = { 0xF3, 0x11, DATA_ONLY, 0x00, DATA_ONLY, 0x00, DATA_ONLY, 0x00, DATA_ONLY, 0x02, ENDDEF, 0x00 }; static const unsigned short seq_vl2_en[] = { 0xF3, 0x13, DATA_ONLY, 0x00, DATA_ONLY, 0x00, DATA_ONLY, 0x00, DATA_ONLY, 0x02, ENDDEF, 0x00 }; static const unsigned short seq_vci1_2nd_en[] = { 0xF3, 0x33, DATA_ONLY, 0x00, DATA_ONLY, 0x00, DATA_ONLY, 0x00, DATA_ONLY, 0x02, ENDDEF, 0x00 }; static const unsigned short seq_vl3_en[] = { 0xF3, 0x37, DATA_ONLY, 0x00, DATA_ONLY, 0x00, DATA_ONLY, 0x00, DATA_ONLY, 0x02, ENDDEF, 0x00 }; static const unsigned short seq_vreg1_amp_en[] = { 0xF3, 0x37, DATA_ONLY, 0x01, DATA_ONLY, 0x00, DATA_ONLY, 0x00, DATA_ONLY, 0x02, ENDDEF, 0x00 }; static const unsigned short seq_vgh_amp_en[] = { 0xF3, 0x37, DATA_ONLY, 0x11, DATA_ONLY, 0x00, DATA_ONLY, 0x00, DATA_ONLY, 0x02, ENDDEF, 0x00 }; static const unsigned short seq_vgl_amp_en[] = { 0xF3, 0x37, DATA_ONLY, 0x31, DATA_ONLY, 0x00, DATA_ONLY, 0x00, DATA_ONLY, 0x02, ENDDEF, 0x00 }; static const unsigned short seq_vmos_amp_en[] = { 0xF3, 0x37, DATA_ONLY, 0xB1, DATA_ONLY, 0x00, DATA_ONLY, 0x00, DATA_ONLY, 0x03, ENDDEF, 0x00 }; static const unsigned short seq_vint_amp_en[] = { 0xF3, 0x37, DATA_ONLY, 0xF1, /* DATA_ONLY, 0x71, VMOS/VBL/VBH not used */ DATA_ONLY, 0x00, DATA_ONLY, 0x00, DATA_ONLY, 0x03, /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */ ENDDEF, 0x00 }; static const unsigned short seq_vbh_amp_en[] = { 0xF3, 0x37, DATA_ONLY, 0xF9, DATA_ONLY, 0x00, DATA_ONLY, 0x00, DATA_ONLY, 0x03, ENDDEF, 0x00 }; static const unsigned short seq_vbl_amp_en[] = { 0xF3, 0x37, DATA_ONLY, 0xFD, DATA_ONLY, 0x00, DATA_ONLY, 0x00, DATA_ONLY, 0x03, ENDDEF, 0x00 }; static const unsigned short seq_gam_amp_en[] = { 0xF3, 0x37, DATA_ONLY, 0xFF, /* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */ DATA_ONLY, 0x00, DATA_ONLY, 0x00, DATA_ONLY, 0x03, /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */ ENDDEF, 0x00 }; static const unsigned short seq_sd_amp_en[] = { 0xF3, 0x37, DATA_ONLY, 0xFF, /* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */ DATA_ONLY, 0x80, DATA_ONLY, 0x00, DATA_ONLY, 0x03, /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */ ENDDEF, 0x00 }; static const unsigned short seq_gls_en[] = { 0xF3, 0x37, DATA_ONLY, 0xFF, /* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */ DATA_ONLY, 0x81, DATA_ONLY, 0x00, DATA_ONLY, 0x03, /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */ ENDDEF, 0x00 }; static const unsigned short seq_els_en[] = { 0xF3, 0x37, DATA_ONLY, 0xFF, /* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */ DATA_ONLY, 0x83, DATA_ONLY, 0x00, DATA_ONLY, 0x03, /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */ ENDDEF, 0x00 }; static const unsigned short seq_el_on[] = { 0xF3, 0x37, DATA_ONLY, 0xFF, /* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */ DATA_ONLY, 0x87, DATA_ONLY, 0x00, DATA_ONLY, 0x03, /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */ ENDDEF, 0x00 }; static int ld9040_spi_write_byte(struct ld9040 *lcd, int addr, int data) { u16 buf[1]; struct spi_message msg; struct spi_transfer xfer = { .len = 2, .tx_buf = buf, }; buf[0] = (addr << 8) | data; spi_message_init(&msg); spi_message_add_tail(&xfer, &msg); return spi_sync(lcd->spi, &msg); } static int ld9040_spi_write(struct ld9040 *lcd, unsigned char address, unsigned char command) { int ret = 0; if (address != DATA_ONLY) ret = ld9040_spi_write_byte(lcd, 0x0, address); if (command != COMMAND_ONLY) ret = ld9040_spi_write_byte(lcd, 0x1, command); return ret; } static int ld9040_panel_send_sequence(struct ld9040 *lcd, const unsigned short *wbuf) { int ret = 0, i = 0; while ((wbuf[i] & DEFMASK) != ENDDEF) { if ((wbuf[i] & DEFMASK) != SLEEPMSEC) { ret = ld9040_spi_write(lcd, wbuf[i], wbuf[i+1]); if (ret) break; } else { msleep(wbuf[i+1]); } i += 2; } return ret; } static int _ld9040_gamma_ctl(struct ld9040 *lcd, const unsigned int *gamma) { unsigned int i = 0; int ret = 0; /* start gamma table updating. */ ret = ld9040_panel_send_sequence(lcd, seq_gamma_start); if (ret) { dev_err(lcd->dev, "failed to disable gamma table updating.\n"); goto gamma_err; } for (i = 0 ; i < GAMMA_TABLE_COUNT; i++) { ret = ld9040_spi_write(lcd, DATA_ONLY, gamma[i]); if (ret) { dev_err(lcd->dev, "failed to set gamma table.\n"); goto gamma_err; } } /* update gamma table. */ ret = ld9040_panel_send_sequence(lcd, seq_gamma_ctrl); if (ret) dev_err(lcd->dev, "failed to update gamma table.\n"); gamma_err: return ret; } static int ld9040_gamma_ctl(struct ld9040 *lcd, int gamma) { return _ld9040_gamma_ctl(lcd, gamma_table.gamma_22_table[gamma]); } static int ld9040_ldi_init(struct ld9040 *lcd) { int ret, i; static const unsigned short *init_seq[] = { seq_user_setting, seq_panel_condition, seq_display_ctrl, seq_manual_pwr, seq_elvss_on, seq_gtcon, seq_gamma_set1, seq_gamma_ctrl, seq_sleep_out, }; for (i = 0; i < ARRAY_SIZE(init_seq); i++) { ret = ld9040_panel_send_sequence(lcd, init_seq[i]); /* workaround: minimum delay time for transferring CMD */ usleep_range(300, 310); if (ret) break; } return ret; } static int ld9040_ldi_enable(struct ld9040 *lcd) { return ld9040_panel_send_sequence(lcd, seq_display_on); } static int ld9040_ldi_disable(struct ld9040 *lcd) { int ret; ret = ld9040_panel_send_sequence(lcd, seq_display_off); ret = ld9040_panel_send_sequence(lcd, seq_sleep_in); return ret; } static int ld9040_power_is_on(int power) { return power <= FB_BLANK_NORMAL; } static int ld9040_power_on(struct ld9040 *lcd) { int ret = 0; struct lcd_platform_data *pd; pd = lcd->lcd_pd; /* lcd power on */ ld9040_regulator_enable(lcd); if (!pd->reset) { dev_err(lcd->dev, "reset is NULL.\n"); return -EINVAL; } 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");