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backlight: spi driver for LMS283GF05 LCD 

ADd support for the SPI part of LMS283GF05 LCD.  The LCD uses SPI for
initialization and powerdown sequences.  No further defails are specified
in the datasheet about the initialization/powerdown sequence, just the
magic numbers that have to be sent over SPI bus.  This LCD can be found in
the Aeronix Zipit Z2 handheld.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
This commit is contained in:
Marek Vasut 2009-08-06 16:07:10 -07:00 committed by Richard Purdie
parent 156ff0d473
commit 5036cc41e0
4 changed files with 278 additions and 0 deletions
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7
drivers/video/backlight/Kconfig
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@ -31,6 +31,13 @@ config LCD_CORGI
Say y here to support the LCD panels usually found on SHARP
corgi (C7x0) and spitz (Cxx00) models.
config LCD_LMS283GF05
tristate "Samsung LMS283GF05 LCD"
depends on LCD_CLASS_DEVICE && SPI_MASTER && GENERIC_GPIO
help
SPI driver for Samsung LMS283GF05. This provides basic support
for powering the LCD up/down through a sysfs interface.
config LCD_LTV350QV
tristate "Samsung LTV350QV LCD Panel"
depends on LCD_CLASS_DEVICE && SPI_MASTER

1
drivers/video/backlight/Makefile
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@ -3,6 +3,7 @@
obj-$(CONFIG_LCD_CLASS_DEVICE) += lcd.o
obj-$(CONFIG_LCD_CORGI) += corgi_lcd.o
obj-$(CONFIG_LCD_HP700) += jornada720_lcd.o
obj-$(CONFIG_LCD_LMS283GF05) += lms283gf05.o
obj-$(CONFIG_LCD_LTV350QV) += ltv350qv.o
obj-$(CONFIG_LCD_ILI9320) += ili9320.o
obj-$(CONFIG_LCD_PLATFORM) += platform_lcd.o

242
drivers/video/backlight/lms283gf05.c Normal file
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@ -0,0 +1,242 @@
/*
* lms283gf05.c -- support for Samsung LMS283GF05 LCD
*
* Copyright (c) 2009 Marek Vasut <marek.vasut@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/lcd.h>
#include <linux/spi/spi.h>
#include <linux/spi/lms283gf05.h>
struct lms283gf05_state {
struct spi_device *spi;
struct lcd_device *ld;
};
struct lms283gf05_seq {
unsigned char reg;
unsigned short value;
unsigned char delay;
};
/* Magic sequences supplied by manufacturer, for details refer to datasheet */
static struct lms283gf05_seq disp_initseq[] = {
/* REG, VALUE, DELAY */
{ 0x07, 0x0000, 0 },
{ 0x13, 0x0000, 10 },
{ 0x11, 0x3004, 0 },
{ 0x14, 0x200F, 0 },
{ 0x10, 0x1a20, 0 },
{ 0x13, 0x0040, 50 },
{ 0x13, 0x0060, 0 },
{ 0x13, 0x0070, 200 },
{ 0x01, 0x0127, 0 },
{ 0x02, 0x0700, 0 },
{ 0x03, 0x1030, 0 },
{ 0x08, 0x0208, 0 },
{ 0x0B, 0x0620, 0 },
{ 0x0C, 0x0110, 0 },
{ 0x30, 0x0120, 0 },
{ 0x31, 0x0127, 0 },
{ 0x32, 0x0000, 0 },
{ 0x33, 0x0503, 0 },
{ 0x34, 0x0727, 0 },
{ 0x35, 0x0124, 0 },
{ 0x36, 0x0706, 0 },
{ 0x37, 0x0701, 0 },
{ 0x38, 0x0F00, 0 },
{ 0x39, 0x0F00, 0 },
{ 0x40, 0x0000, 0 },
{ 0x41, 0x0000, 0 },
{ 0x42, 0x013f, 0 },
{ 0x43, 0x0000, 0 },
{ 0x44, 0x013f, 0 },
{ 0x45, 0x0000, 0 },
{ 0x46, 0xef00, 0 },
{ 0x47, 0x013f, 0 },
{ 0x48, 0x0000, 0 },
{ 0x07, 0x0015, 30 },
{ 0x07, 0x0017, 0 },
{ 0x20, 0x0000, 0 },
{ 0x21, 0x0000, 0 },
{ 0x22, 0x0000, 0 }
};
static struct lms283gf05_seq disp_pdwnseq[] = {
{ 0x07, 0x0016, 30 },
{ 0x07, 0x0004, 0 },
{ 0x10, 0x0220, 20 },
{ 0x13, 0x0060, 50 },
{ 0x13, 0x0040, 50 },
{ 0x13, 0x0000, 0 },
{ 0x10, 0x0000, 0 }
};
static void lms283gf05_reset(unsigned long gpio, bool inverted)
{
gpio_set_value(gpio, !inverted);
mdelay(100);
gpio_set_value(gpio, inverted);
mdelay(20);
gpio_set_value(gpio, !inverted);
mdelay(20);
}
static void lms283gf05_toggle(struct spi_device *spi,
struct lms283gf05_seq *seq, int sz)
{
char buf[3];
int i;
for (i = 0; i < sz; i++) {
buf[0] = 0x74;
buf[1] = 0x00;
buf[2] = seq[i].reg;
spi_write(spi, buf, 3);
buf[0] = 0x76;
buf[1] = seq[i].value >> 8;
buf[2] = seq[i].value & 0xff;
spi_write(spi, buf, 3);
mdelay(seq[i].delay);
}
}
static int lms283gf05_power_set(struct lcd_device *ld, int power)
{
struct lms283gf05_state *st = lcd_get_data(ld);
struct spi_device *spi = st->spi;
struct lms283gf05_pdata *pdata = spi->dev.platform_data;
if (power) {
if (pdata)
lms283gf05_reset(pdata->reset_gpio,
pdata->reset_inverted);
lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
} else {
lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq));
if (pdata)
gpio_set_value(pdata->reset_gpio,
pdata->reset_inverted);
}
return 0;
}
static struct lcd_ops lms_ops = {
.set_power = lms283gf05_power_set,
.get_power = NULL,
};
static int __devinit lms283gf05_probe(struct spi_device *spi)
{
struct lms283gf05_state *st;
struct lms283gf05_pdata *pdata = spi->dev.platform_data;
struct lcd_device *ld;
int ret = 0;
if (pdata != NULL) {
ret = gpio_request(pdata->reset_gpio, "LMS285GF05 RESET");
if (ret)
return ret;
ret = gpio_direction_output(pdata->reset_gpio,
!pdata->reset_inverted);
if (ret)
goto err;
}
st = kzalloc(sizeof(struct lms283gf05_state), GFP_KERNEL);
if (st == NULL) {
dev_err(&spi->dev, "No memory for device state\n");
ret = -ENOMEM;
goto err;
}
ld = lcd_device_register("lms283gf05", &spi->dev, st, &lms_ops);
if (IS_ERR(ld)) {
ret = PTR_ERR(ld);
goto err2;
}
st->spi = spi;
st->ld = ld;
dev_set_drvdata(&spi->dev, st);
/* kick in the LCD */
if (pdata)
lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted);
lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
return 0;
err2:
kfree(st);
err:
if (pdata != NULL)
gpio_free(pdata->reset_gpio);
return ret;
}
static int __devexit lms283gf05_remove(struct spi_device *spi)
{
struct lms283gf05_state *st = dev_get_drvdata(&spi->dev);
struct lms283gf05_pdata *pdata = st->spi->dev.platform_data;
lcd_device_unregister(st->ld);
if (pdata != NULL)
gpio_free(pdata->reset_gpio);
kfree(st);
return 0;
}
static struct spi_driver lms283gf05_driver = {
.driver = {
.name = "lms283gf05",
.owner = THIS_MODULE,
},
.probe = lms283gf05_probe,
.remove = __devexit_p(lms283gf05_remove),
};
static __init int lms283gf05_init(void)
{
return spi_register_driver(&lms283gf05_driver);
}
static __exit void lms283gf05_exit(void)
{
spi_unregister_driver(&lms283gf05_driver);
}
module_init(lms283gf05_init);
module_exit(lms283gf05_exit);
MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
MODULE_DESCRIPTION("LCD283GF05 LCD");
MODULE_LICENSE("GPL v2");

28
include/linux/spi/lms283gf05.h Normal file
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@ -0,0 +1,28 @@
/*
* lms283gf05.h - Platform glue for Samsung LMS283GF05 LCD
*
* Copyright (C) 2009 Marek Vasut <marek.vasut@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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
*/
#ifndef _INCLUDE_LINUX_SPI_LMS283GF05_H_
#define _INCLUDE_LINUX_SPI_LMS283GF05_H_
struct lms283gf05_pdata {
unsigned long reset_gpio;
bool reset_inverted;
};
#endif /* _INCLUDE_LINUX_SPI_LMS283GF05_H_ */