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backlight: spi driver for LMS283GF05 LCD
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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>
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Marek Vasut authored and Richard Purdie committed Sep 7, 2009
1 parent 156ff0d commit 5036cc4
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7 changes: 7 additions & 0 deletions drivers/video/backlight/Kconfig
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Expand Up @@ -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
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1 change: 1 addition & 0 deletions drivers/video/backlight/Makefile
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Expand Up @@ -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
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242 changes: 242 additions & 0 deletions drivers/video/backlight/lms283gf05.c
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/*
* 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 changes: 28 additions & 0 deletions include/linux/spi/lms283gf05.h
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/*
* 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_ */

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