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linux/drivers/video/backlight/ams369fg06.c
Jingoo Han 80629efcae backlight: ams369fg06: use devm_ functions 
The devm_ functions allocate memory that is released when a driver
detaches.  This patch uses devm_kzalloc of these functions.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-05-29 16:22:30 -07:00

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/*
* 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.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/wait.h>
#include <linux/module.h>
#include <linux/fb.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/spi/spi.h>
#include <linux/lcd.h>
#include <linux/backlight.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
mdelay(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 = NULL;
struct backlight_device *bd = NULL;
pd = lcd->lcd_pd;
if (!pd) {
dev_err(lcd->dev, "platform data is NULL.\n");
return -EFAULT;
}
bd = lcd->bd;
if (!bd) {
dev_err(lcd->dev, "backlight device is NULL.\n");
return -EFAULT;
}
if (!pd->power_on) {
dev_err(lcd->dev, "power_on is NULL.\n");
return -EFAULT;
} else {
pd->power_on(lcd->ld, 1);
mdelay(pd->power_on_delay);
}
if (!pd->reset) {
dev_err(lcd->dev, "reset is NULL.\n");
return -EFAULT;
} else {
pd->reset(lcd->ld);
mdelay(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 = 0;
struct lcd_platform_data *pd = NULL;
pd = lcd->lcd_pd;
if (!pd) {
dev_err(lcd->dev, "platform data is NULL\n");
return -EFAULT;
}
ret = ams369fg06_ldi_disable(lcd);
if (ret) {
dev_err(lcd->dev, "lcd setting failed.\n");
return -EIO;
}
mdelay(pd->power_off_delay);
if (!pd->power_on) {
dev_err(lcd->dev, "power_on is NULL.\n");
return -EFAULT;
} else
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_get_brightness(struct backlight_device *bd)
{
return bd->props.brightness;
}
static int ams369fg06_set_brightness(struct backlight_device *bd)
{
int ret = 0;
int brightness = bd->props.brightness;
struct ams369fg06 *lcd = dev_get_drvdata(&bd->dev);
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 = {
.get_brightness = ams369fg06_get_brightness,
.update_status = ams369fg06_set_brightness,
};
static int __devinit 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 = spi->dev.platform_data;
if (!lcd->lcd_pd) {
dev_err(&spi->dev, "platform data is NULL\n");
return -EFAULT;
}
ld = lcd_device_register("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 = backlight_device_register("ams369fg06-bl", &spi->dev, lcd,
&ams369fg06_backlight_ops, &props);
if (IS_ERR(bd)) {
ret = PTR_ERR(bd);
goto out_lcd_unregister;
}
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;
dev_set_drvdata(&spi->dev, lcd);
dev_info(&spi->dev, "ams369fg06 panel driver has been probed.\n");
return 0;
out_lcd_unregister:
lcd_device_unregister(ld);
return ret;
}
static int __devexit ams369fg06_remove(struct spi_device *spi)
{
struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev);
ams369fg06_power(lcd, FB_BLANK_POWERDOWN);
backlight_device_unregister(lcd->bd);
lcd_device_unregister(lcd->ld);
return 0;
}
#if defined(CONFIG_PM)
static unsigned int before_power;
static int ams369fg06_suspend(struct spi_device *spi, pm_message_t mesg)
{
int ret = 0;
struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev);
dev_dbg(&spi->dev, "lcd->power = %d\n", lcd->power);
before_power = lcd->power;
/*
* when lcd panel is suspend, lcd panel becomes off
* regardless of status.
*/
ret = ams369fg06_power(lcd, FB_BLANK_POWERDOWN);
return ret;
}
static int ams369fg06_resume(struct spi_device *spi)
{
int ret = 0;
struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev);
/*
* after suspended, if lcd panel status is FB_BLANK_UNBLANK
* (at that time, before_power is FB_BLANK_UNBLANK) then
* it changes that status to FB_BLANK_POWERDOWN to get lcd on.
*/
if (before_power == FB_BLANK_UNBLANK)
lcd->power = FB_BLANK_POWERDOWN;
dev_dbg(&spi->dev, "before_power = %d\n", before_power);
ret = ams369fg06_power(lcd, before_power);
return ret;
}
#else
#define ams369fg06_suspend NULL
#define ams369fg06_resume NULL
#endif
static void ams369fg06_shutdown(struct spi_device *spi)
{
struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev);
ams369fg06_power(lcd, FB_BLANK_POWERDOWN);
}
static struct spi_driver ams369fg06_driver = {
.driver = {
.name = "ams369fg06",
.owner = THIS_MODULE,
},
.probe = ams369fg06_probe,
.remove = __devexit_p(ams369fg06_remove),
.shutdown = ams369fg06_shutdown,
.suspend = ams369fg06_suspend,
.resume = ams369fg06_resume,
};
module_spi_driver(ams369fg06_driver);
MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
MODULE_DESCRIPTION("ams369fg06 LCD Driver");
MODULE_LICENSE("GPL");
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