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linux/drivers/video/backlight/ld9040.c
Jingoo Han eba3bfb4c0 backlight: ld9040: convert ld9040 to dev_pm_ops 
Instead of using legacy suspend/resume methods, using newer dev_pm_ops
structure allows better control over power management.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-04-29 18:28:15 -07:00

828 lines
16 KiB
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/*
* 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;
} else {
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_get_brightness(struct backlight_device *bd)
{
return bd->props.brightness;
}
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 = {
.get_brightness = ld9040_get_brightness,
.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 = spi->dev.platform_data;
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 = lcd_device_register("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 = backlight_device_register("ld9040-bl", &spi->dev,
lcd, &ld9040_backlight_ops, &props);
if (IS_ERR(bd)) {
ret = PTR_ERR(bd);
goto out_unregister_lcd;
}
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;
out_unregister_lcd:
lcd_device_unregister(lcd->ld);
return ret;
}
static int ld9040_remove(struct spi_device *spi)
{
struct ld9040 *lcd = spi_get_drvdata(spi);
ld9040_power(lcd, FB_BLANK_POWERDOWN);
backlight_device_unregister(lcd->bd);
lcd_device_unregister(lcd->ld);
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",
.owner = THIS_MODULE,
.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");
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