diff options
Diffstat (limited to 'drivers/video/backlight/ams369fg06.c')
| -rw-r--r-- | drivers/video/backlight/ams369fg06.c | 571 |
1 files changed, 571 insertions, 0 deletions
diff --git a/drivers/video/backlight/ams369fg06.c b/drivers/video/backlight/ams369fg06.c new file mode 100644 index 000000000..5f897f99c --- /dev/null +++ b/drivers/video/backlight/ams369fg06.c @@ -0,0 +1,571 @@ +/* + * ams369fg06 AMOLED LCD panel driver. + * + * Copyright (c) 2011 Samsung Electronics Co., Ltd. + * Author: Jingoo Han <jg1.han@samsung.com> + * + * Derived from drivers/video/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/lcd.h> +#include <linux/module.h> +#include <linux/spi/spi.h> +#include <linux/wait.h> + +#define SLEEPMSEC 0x1000 +#define ENDDEF 0x2000 +#define DEFMASK 0xFF00 +#define COMMAND_ONLY 0xFE +#define DATA_ONLY 0xFF + +#define MAX_GAMMA_LEVEL 5 +#define GAMMA_TABLE_COUNT 21 + +#define MIN_BRIGHTNESS 0 +#define MAX_BRIGHTNESS 255 +#define DEFAULT_BRIGHTNESS 150 + +struct ams369fg06 { + struct device *dev; + struct spi_device *spi; + unsigned int power; + struct lcd_device *ld; + struct backlight_device *bd; + struct lcd_platform_data *lcd_pd; +}; + +static const unsigned short seq_display_on[] = { + 0x14, 0x03, + ENDDEF, 0x0000 +}; + +static const unsigned short seq_display_off[] = { + 0x14, 0x00, + ENDDEF, 0x0000 +}; + +static const unsigned short seq_stand_by_on[] = { + 0x1D, 0xA1, + SLEEPMSEC, 200, + ENDDEF, 0x0000 +}; + +static const unsigned short seq_stand_by_off[] = { + 0x1D, 0xA0, + SLEEPMSEC, 250, + ENDDEF, 0x0000 +}; + +static const unsigned short seq_setting[] = { + 0x31, 0x08, + 0x32, 0x14, + 0x30, 0x02, + 0x27, 0x01, + 0x12, 0x08, + 0x13, 0x08, + 0x15, 0x00, + 0x16, 0x00, + + 0xef, 0xd0, + DATA_ONLY, 0xe8, + + 0x39, 0x44, + 0x40, 0x00, + 0x41, 0x3f, + 0x42, 0x2a, + 0x43, 0x27, + 0x44, 0x27, + 0x45, 0x1f, + 0x46, 0x44, + 0x50, 0x00, + 0x51, 0x00, + 0x52, 0x17, + 0x53, 0x24, + 0x54, 0x26, + 0x55, 0x1f, + 0x56, 0x43, + 0x60, 0x00, + 0x61, 0x3f, + 0x62, 0x2a, + 0x63, 0x25, + 0x64, 0x24, + 0x65, 0x1b, + 0x66, 0x5c, + + 0x17, 0x22, + 0x18, 0x33, + 0x19, 0x03, + 0x1a, 0x01, + 0x22, 0xa4, + 0x23, 0x00, + 0x26, 0xa0, + + 0x1d, 0xa0, + SLEEPMSEC, 300, + + 0x14, 0x03, + + ENDDEF, 0x0000 +}; + +/* gamma value: 2.2 */ +static const unsigned int ams369fg06_22_250[] = { + 0x00, 0x3f, 0x2a, 0x27, 0x27, 0x1f, 0x44, + 0x00, 0x00, 0x17, 0x24, 0x26, 0x1f, 0x43, + 0x00, 0x3f, 0x2a, 0x25, 0x24, 0x1b, 0x5c, +}; + +static const unsigned int ams369fg06_22_200[] = { + 0x00, 0x3f, 0x28, 0x29, 0x27, 0x21, 0x3e, + 0x00, 0x00, 0x10, 0x25, 0x27, 0x20, 0x3d, + 0x00, 0x3f, 0x28, 0x27, 0x25, 0x1d, 0x53, +}; + +static const unsigned int ams369fg06_22_150[] = { + 0x00, 0x3f, 0x2d, 0x29, 0x28, 0x23, 0x37, + 0x00, 0x00, 0x0b, 0x25, 0x28, 0x22, 0x36, + 0x00, 0x3f, 0x2b, 0x28, 0x26, 0x1f, 0x4a, +}; + +static const unsigned int ams369fg06_22_100[] = { + 0x00, 0x3f, 0x30, 0x2a, 0x2b, 0x24, 0x2f, + 0x00, 0x00, 0x00, 0x25, 0x29, 0x24, 0x2e, + 0x00, 0x3f, 0x2f, 0x29, 0x29, 0x21, 0x3f, +}; + +static const unsigned int ams369fg06_22_50[] = { + 0x00, 0x3f, 0x3c, 0x2c, 0x2d, 0x27, 0x24, + 0x00, 0x00, 0x00, 0x22, 0x2a, 0x27, 0x23, + 0x00, 0x3f, 0x3b, 0x2c, 0x2b, 0x24, 0x31, +}; + +struct ams369fg06_gamma { + unsigned int *gamma_22_table[MAX_GAMMA_LEVEL]; +}; + +static struct ams369fg06_gamma gamma_table = { + .gamma_22_table[0] = (unsigned int *)&ams369fg06_22_50, + .gamma_22_table[1] = (unsigned int *)&ams369fg06_22_100, + .gamma_22_table[2] = (unsigned int *)&ams369fg06_22_150, + .gamma_22_table[3] = (unsigned int *)&ams369fg06_22_200, + .gamma_22_table[4] = (unsigned int *)&ams369fg06_22_250, +}; + +static int ams369fg06_spi_write_byte(struct ams369fg06 *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 ams369fg06_spi_write(struct ams369fg06 *lcd, unsigned char address, + unsigned char command) +{ + int ret = 0; + + if (address != DATA_ONLY) + ret = ams369fg06_spi_write_byte(lcd, 0x70, address); + if (command != COMMAND_ONLY) + ret = ams369fg06_spi_write_byte(lcd, 0x72, command); + + return ret; +} + +static int ams369fg06_panel_send_sequence(struct ams369fg06 *lcd, + const unsigned short *wbuf) +{ + int ret = 0, i = 0; + + while ((wbuf[i] & DEFMASK) != ENDDEF) { + if ((wbuf[i] & DEFMASK) != SLEEPMSEC) { + ret = ams369fg06_spi_write(lcd, wbuf[i], wbuf[i+1]); + if (ret) + break; + } else { + msleep(wbuf[i+1]); + } + i += 2; + } + + return ret; +} + +static int _ams369fg06_gamma_ctl(struct ams369fg06 *lcd, + const unsigned int *gamma) +{ + unsigned int i = 0; + int ret = 0; + + for (i = 0 ; i < GAMMA_TABLE_COUNT / 3; i++) { + ret = ams369fg06_spi_write(lcd, 0x40 + i, gamma[i]); + ret = ams369fg06_spi_write(lcd, 0x50 + i, gamma[i+7*1]); + ret = ams369fg06_spi_write(lcd, 0x60 + i, gamma[i+7*2]); + if (ret) { + dev_err(lcd->dev, "failed to set gamma table.\n"); + goto gamma_err; + } + } + +gamma_err: + return ret; +} + +static int ams369fg06_gamma_ctl(struct ams369fg06 *lcd, int brightness) +{ + int ret = 0; + int gamma = 0; + + if ((brightness >= 0) && (brightness <= 50)) + gamma = 0; + else if ((brightness > 50) && (brightness <= 100)) + gamma = 1; + else if ((brightness > 100) && (brightness <= 150)) + gamma = 2; + else if ((brightness > 150) && (brightness <= 200)) + gamma = 3; + else if ((brightness > 200) && (brightness <= 255)) + gamma = 4; + + ret = _ams369fg06_gamma_ctl(lcd, gamma_table.gamma_22_table[gamma]); + + return ret; +} + +static int ams369fg06_ldi_init(struct ams369fg06 *lcd) +{ + int ret, i; + static const unsigned short *init_seq[] = { + seq_setting, + seq_stand_by_off, + }; + + for (i = 0; i < ARRAY_SIZE(init_seq); i++) { + ret = ams369fg06_panel_send_sequence(lcd, init_seq[i]); + if (ret) + break; + } + + return ret; +} + +static int ams369fg06_ldi_enable(struct ams369fg06 *lcd) +{ + int ret, i; + static const unsigned short *init_seq[] = { + seq_stand_by_off, + seq_display_on, + }; + + for (i = 0; i < ARRAY_SIZE(init_seq); i++) { + ret = ams369fg06_panel_send_sequence(lcd, init_seq[i]); + if (ret) + break; + } + + return ret; +} + +static int ams369fg06_ldi_disable(struct ams369fg06 *lcd) +{ + int ret, i; + + static const unsigned short *init_seq[] = { + seq_display_off, + seq_stand_by_on, + }; + + for (i = 0; i < ARRAY_SIZE(init_seq); i++) { + ret = ams369fg06_panel_send_sequence(lcd, init_seq[i]); + if (ret) + break; + } + + return ret; +} + +static int ams369fg06_power_is_on(int power) +{ + return power <= FB_BLANK_NORMAL; +} + +static int ams369fg06_power_on(struct ams369fg06 *lcd) +{ + int ret = 0; + struct lcd_platform_data *pd; + struct backlight_device *bd; + + pd = lcd->lcd_pd; + bd = lcd->bd; + + if (pd->power_on) { + pd->power_on(lcd->ld, 1); + msleep(pd->power_on_delay); + } + + if (!pd->reset) { + dev_err(lcd->dev, "reset is NULL.\n"); + return -EINVAL; + } + + pd->reset(lcd->ld); + msleep(pd->reset_delay); + + ret = ams369fg06_ldi_init(lcd); + if (ret) { + dev_err(lcd->dev, "failed to initialize ldi.\n"); + return ret; + } + + ret = ams369fg06_ldi_enable(lcd); + if (ret) { + dev_err(lcd->dev, "failed to enable ldi.\n"); + return ret; + } + + /* set brightness to current value after power on or resume. */ + ret = ams369fg06_gamma_ctl(lcd, bd->props.brightness); + if (ret) { + dev_err(lcd->dev, "lcd gamma setting failed.\n"); + return ret; + } + + return 0; +} + +static int ams369fg06_power_off(struct ams369fg06 *lcd) +{ + int ret; + struct lcd_platform_data *pd; + + pd = lcd->lcd_pd; + + ret = ams369fg06_ldi_disable(lcd); + if (ret) { + dev_err(lcd->dev, "lcd setting failed.\n"); + return -EIO; + } + + msleep(pd->power_off_delay); + + if (pd->power_on) + pd->power_on(lcd->ld, 0); + + return 0; +} + +static int ams369fg06_power(struct ams369fg06 *lcd, int power) +{ + int ret = 0; + + if (ams369fg06_power_is_on(power) && + !ams369fg06_power_is_on(lcd->power)) + ret = ams369fg06_power_on(lcd); + else if (!ams369fg06_power_is_on(power) && + ams369fg06_power_is_on(lcd->power)) + ret = ams369fg06_power_off(lcd); + + if (!ret) + lcd->power = power; + + return ret; +} + +static int ams369fg06_get_power(struct lcd_device *ld) +{ + struct ams369fg06 *lcd = lcd_get_data(ld); + + return lcd->power; +} + +static int ams369fg06_set_power(struct lcd_device *ld, int power) +{ + struct ams369fg06 *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 ams369fg06_power(lcd, power); +} + +static int ams369fg06_set_brightness(struct backlight_device *bd) +{ + int ret = 0; + int brightness = bd->props.brightness; + struct ams369fg06 *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 = ams369fg06_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 ams369fg06_lcd_ops = { + .get_power = ams369fg06_get_power, + .set_power = ams369fg06_set_power, +}; + +static const struct backlight_ops ams369fg06_backlight_ops = { + .update_status = ams369fg06_set_brightness, +}; + +static int ams369fg06_probe(struct spi_device *spi) +{ + int ret = 0; + struct ams369fg06 *lcd = NULL; + struct lcd_device *ld = NULL; + struct backlight_device *bd = NULL; + struct backlight_properties props; + + lcd = devm_kzalloc(&spi->dev, sizeof(struct ams369fg06), GFP_KERNEL); + if (!lcd) + return -ENOMEM; + + /* ams369fg06 lcd panel uses 3-wire 16bits SPI Mode. */ + spi->bits_per_word = 16; + + 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; + } + + ld = devm_lcd_device_register(&spi->dev, "ams369fg06", &spi->dev, lcd, + &ams369fg06_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, "ams369fg06-bl", + &spi->dev, lcd, + &ams369fg06_backlight_ops, &props); + if (IS_ERR(bd)) + return PTR_ERR(bd); + + bd->props.brightness = DEFAULT_BRIGHTNESS; + lcd->bd = bd; + + 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; + + ams369fg06_power(lcd, FB_BLANK_UNBLANK); + } else { + lcd->power = FB_BLANK_UNBLANK; + } + + spi_set_drvdata(spi, lcd); + + dev_info(&spi->dev, "ams369fg06 panel driver has been probed.\n"); + + return 0; +} + +static int ams369fg06_remove(struct spi_device *spi) +{ + struct ams369fg06 *lcd = spi_get_drvdata(spi); + + ams369fg06_power(lcd, FB_BLANK_POWERDOWN); + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int ams369fg06_suspend(struct device *dev) +{ + struct ams369fg06 *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 ams369fg06_power(lcd, FB_BLANK_POWERDOWN); +} + +static int ams369fg06_resume(struct device *dev) +{ + struct ams369fg06 *lcd = dev_get_drvdata(dev); + + lcd->power = FB_BLANK_POWERDOWN; + + return ams369fg06_power(lcd, FB_BLANK_UNBLANK); +} +#endif + +static SIMPLE_DEV_PM_OPS(ams369fg06_pm_ops, ams369fg06_suspend, + ams369fg06_resume); + +static void ams369fg06_shutdown(struct spi_device *spi) +{ + struct ams369fg06 *lcd = spi_get_drvdata(spi); + + ams369fg06_power(lcd, FB_BLANK_POWERDOWN); +} + +static struct spi_driver ams369fg06_driver = { + .driver = { + .name = "ams369fg06", + .owner = THIS_MODULE, + .pm = &ams369fg06_pm_ops, + }, + .probe = ams369fg06_probe, + .remove = ams369fg06_remove, + .shutdown = ams369fg06_shutdown, +}; + +module_spi_driver(ams369fg06_driver); + +MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); +MODULE_DESCRIPTION("ams369fg06 LCD Driver"); +MODULE_LICENSE("GPL"); |