mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
![Axel Lin](/assets/img/avatar_default.png)
Signed-off-by: Axel Lin <axel.lin@gmail.com> Cc: Haavard Skinnemoen <hskinnemoen@atmel.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>
339 lines
8.2 KiB
C
339 lines
8.2 KiB
C
/*
|
|
* Power control for Samsung LTV350QV Quarter VGA LCD Panel
|
|
*
|
|
* Copyright (C) 2006, 2007 Atmel Corporation
|
|
*
|
|
* 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/delay.h>
|
|
#include <linux/err.h>
|
|
#include <linux/fb.h>
|
|
#include <linux/init.h>
|
|
#include <linux/lcd.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/spi/spi.h>
|
|
|
|
#include "ltv350qv.h"
|
|
|
|
#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
|
|
|
|
struct ltv350qv {
|
|
struct spi_device *spi;
|
|
u8 *buffer;
|
|
int power;
|
|
struct lcd_device *ld;
|
|
};
|
|
|
|
/*
|
|
* The power-on and power-off sequences are taken from the
|
|
* LTV350QV-F04 data sheet from Samsung. The register definitions are
|
|
* taken from the S6F2002 command list also from Samsung. Both
|
|
* documents are distributed with the AVR32 Linux BSP CD from Atmel.
|
|
*
|
|
* There's still some voodoo going on here, but it's a lot better than
|
|
* in the first incarnation of the driver where all we had was the raw
|
|
* numbers from the initialization sequence.
|
|
*/
|
|
static int ltv350qv_write_reg(struct ltv350qv *lcd, u8 reg, u16 val)
|
|
{
|
|
struct spi_message msg;
|
|
struct spi_transfer index_xfer = {
|
|
.len = 3,
|
|
.cs_change = 1,
|
|
};
|
|
struct spi_transfer value_xfer = {
|
|
.len = 3,
|
|
};
|
|
|
|
spi_message_init(&msg);
|
|
|
|
/* register index */
|
|
lcd->buffer[0] = LTV_OPC_INDEX;
|
|
lcd->buffer[1] = 0x00;
|
|
lcd->buffer[2] = reg & 0x7f;
|
|
index_xfer.tx_buf = lcd->buffer;
|
|
spi_message_add_tail(&index_xfer, &msg);
|
|
|
|
/* register value */
|
|
lcd->buffer[4] = LTV_OPC_DATA;
|
|
lcd->buffer[5] = val >> 8;
|
|
lcd->buffer[6] = val;
|
|
value_xfer.tx_buf = lcd->buffer + 4;
|
|
spi_message_add_tail(&value_xfer, &msg);
|
|
|
|
return spi_sync(lcd->spi, &msg);
|
|
}
|
|
|
|
/* The comments are taken straight from the data sheet */
|
|
static int ltv350qv_power_on(struct ltv350qv *lcd)
|
|
{
|
|
int ret;
|
|
|
|
/* Power On Reset Display off State */
|
|
if (ltv350qv_write_reg(lcd, LTV_PWRCTL1, 0x0000))
|
|
goto err;
|
|
msleep(15);
|
|
|
|
/* Power Setting Function 1 */
|
|
if (ltv350qv_write_reg(lcd, LTV_PWRCTL1, LTV_VCOM_DISABLE))
|
|
goto err;
|
|
if (ltv350qv_write_reg(lcd, LTV_PWRCTL2, LTV_VCOML_ENABLE))
|
|
goto err_power1;
|
|
|
|
/* Power Setting Function 2 */
|
|
if (ltv350qv_write_reg(lcd, LTV_PWRCTL1,
|
|
LTV_VCOM_DISABLE | LTV_DRIVE_CURRENT(5)
|
|
| LTV_SUPPLY_CURRENT(5)))
|
|
goto err_power2;
|
|
|
|
msleep(55);
|
|
|
|
/* Instruction Setting */
|
|
ret = ltv350qv_write_reg(lcd, LTV_IFCTL,
|
|
LTV_NMD | LTV_REV | LTV_NL(0x1d));
|
|
ret |= ltv350qv_write_reg(lcd, LTV_DATACTL,
|
|
LTV_DS_SAME | LTV_CHS_480
|
|
| LTV_DF_RGB | LTV_RGB_BGR);
|
|
ret |= ltv350qv_write_reg(lcd, LTV_ENTRY_MODE,
|
|
LTV_VSPL_ACTIVE_LOW
|
|
| LTV_HSPL_ACTIVE_LOW
|
|
| LTV_DPL_SAMPLE_RISING
|
|
| LTV_EPL_ACTIVE_LOW
|
|
| LTV_SS_RIGHT_TO_LEFT);
|
|
ret |= ltv350qv_write_reg(lcd, LTV_GATECTL1, LTV_CLW(3));
|
|
ret |= ltv350qv_write_reg(lcd, LTV_GATECTL2,
|
|
LTV_NW_INV_1LINE | LTV_FWI(3));
|
|
ret |= ltv350qv_write_reg(lcd, LTV_VBP, 0x000a);
|
|
ret |= ltv350qv_write_reg(lcd, LTV_HBP, 0x0021);
|
|
ret |= ltv350qv_write_reg(lcd, LTV_SOTCTL, LTV_SDT(3) | LTV_EQ(0));
|
|
ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(0), 0x0103);
|
|
ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(1), 0x0301);
|
|
ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(2), 0x1f0f);
|
|
ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(3), 0x1f0f);
|
|
ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(4), 0x0707);
|
|
ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(5), 0x0307);
|
|
ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(6), 0x0707);
|
|
ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(7), 0x0000);
|
|
ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(8), 0x0004);
|
|
ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(9), 0x0000);
|
|
if (ret)
|
|
goto err_settings;
|
|
|
|
/* Wait more than 2 frames */
|
|
msleep(20);
|
|
|
|
/* Display On Sequence */
|
|
ret = ltv350qv_write_reg(lcd, LTV_PWRCTL1,
|
|
LTV_VCOM_DISABLE | LTV_VCOMOUT_ENABLE
|
|
| LTV_POWER_ON | LTV_DRIVE_CURRENT(5)
|
|
| LTV_SUPPLY_CURRENT(5));
|
|
ret |= ltv350qv_write_reg(lcd, LTV_GATECTL2,
|
|
LTV_NW_INV_1LINE | LTV_DSC | LTV_FWI(3));
|
|
if (ret)
|
|
goto err_disp_on;
|
|
|
|
/* Display should now be ON. Phew. */
|
|
return 0;
|
|
|
|
err_disp_on:
|
|
/*
|
|
* Try to recover. Error handling probably isn't very useful
|
|
* at this point, just make a best effort to switch the panel
|
|
* off.
|
|
*/
|
|
ltv350qv_write_reg(lcd, LTV_PWRCTL1,
|
|
LTV_VCOM_DISABLE | LTV_DRIVE_CURRENT(5)
|
|
| LTV_SUPPLY_CURRENT(5));
|
|
ltv350qv_write_reg(lcd, LTV_GATECTL2,
|
|
LTV_NW_INV_1LINE | LTV_FWI(3));
|
|
err_settings:
|
|
err_power2:
|
|
err_power1:
|
|
ltv350qv_write_reg(lcd, LTV_PWRCTL2, 0x0000);
|
|
msleep(1);
|
|
err:
|
|
ltv350qv_write_reg(lcd, LTV_PWRCTL1, LTV_VCOM_DISABLE);
|
|
return -EIO;
|
|
}
|
|
|
|
static int ltv350qv_power_off(struct ltv350qv *lcd)
|
|
{
|
|
int ret;
|
|
|
|
/* Display Off Sequence */
|
|
ret = ltv350qv_write_reg(lcd, LTV_PWRCTL1,
|
|
LTV_VCOM_DISABLE
|
|
| LTV_DRIVE_CURRENT(5)
|
|
| LTV_SUPPLY_CURRENT(5));
|
|
ret |= ltv350qv_write_reg(lcd, LTV_GATECTL2,
|
|
LTV_NW_INV_1LINE | LTV_FWI(3));
|
|
|
|
/* Power down setting 1 */
|
|
ret |= ltv350qv_write_reg(lcd, LTV_PWRCTL2, 0x0000);
|
|
|
|
/* Wait at least 1 ms */
|
|
msleep(1);
|
|
|
|
/* Power down setting 2 */
|
|
ret |= ltv350qv_write_reg(lcd, LTV_PWRCTL1, LTV_VCOM_DISABLE);
|
|
|
|
/*
|
|
* No point in trying to recover here. If we can't switch the
|
|
* panel off, what are we supposed to do other than inform the
|
|
* user about the failure?
|
|
*/
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
/* Display power should now be OFF */
|
|
return 0;
|
|
}
|
|
|
|
static int ltv350qv_power(struct ltv350qv *lcd, int power)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
|
|
ret = ltv350qv_power_on(lcd);
|
|
else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
|
|
ret = ltv350qv_power_off(lcd);
|
|
|
|
if (!ret)
|
|
lcd->power = power;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ltv350qv_set_power(struct lcd_device *ld, int power)
|
|
{
|
|
struct ltv350qv *lcd = lcd_get_data(ld);
|
|
|
|
return ltv350qv_power(lcd, power);
|
|
}
|
|
|
|
static int ltv350qv_get_power(struct lcd_device *ld)
|
|
{
|
|
struct ltv350qv *lcd = lcd_get_data(ld);
|
|
|
|
return lcd->power;
|
|
}
|
|
|
|
static struct lcd_ops ltv_ops = {
|
|
.get_power = ltv350qv_get_power,
|
|
.set_power = ltv350qv_set_power,
|
|
};
|
|
|
|
static int __devinit ltv350qv_probe(struct spi_device *spi)
|
|
{
|
|
struct ltv350qv *lcd;
|
|
struct lcd_device *ld;
|
|
int ret;
|
|
|
|
lcd = kzalloc(sizeof(struct ltv350qv), GFP_KERNEL);
|
|
if (!lcd)
|
|
return -ENOMEM;
|
|
|
|
lcd->spi = spi;
|
|
lcd->power = FB_BLANK_POWERDOWN;
|
|
lcd->buffer = kzalloc(8, GFP_KERNEL);
|
|
if (!lcd->buffer) {
|
|
ret = -ENOMEM;
|
|
goto out_free_lcd;
|
|
}
|
|
|
|
ld = lcd_device_register("ltv350qv", &spi->dev, lcd, <v_ops);
|
|
if (IS_ERR(ld)) {
|
|
ret = PTR_ERR(ld);
|
|
goto out_free_buffer;
|
|
}
|
|
lcd->ld = ld;
|
|
|
|
ret = ltv350qv_power(lcd, FB_BLANK_UNBLANK);
|
|
if (ret)
|
|
goto out_unregister;
|
|
|
|
dev_set_drvdata(&spi->dev, lcd);
|
|
|
|
return 0;
|
|
|
|
out_unregister:
|
|
lcd_device_unregister(ld);
|
|
out_free_buffer:
|
|
kfree(lcd->buffer);
|
|
out_free_lcd:
|
|
kfree(lcd);
|
|
return ret;
|
|
}
|
|
|
|
static int __devexit ltv350qv_remove(struct spi_device *spi)
|
|
{
|
|
struct ltv350qv *lcd = dev_get_drvdata(&spi->dev);
|
|
|
|
ltv350qv_power(lcd, FB_BLANK_POWERDOWN);
|
|
lcd_device_unregister(lcd->ld);
|
|
kfree(lcd->buffer);
|
|
kfree(lcd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int ltv350qv_suspend(struct spi_device *spi, pm_message_t state)
|
|
{
|
|
struct ltv350qv *lcd = dev_get_drvdata(&spi->dev);
|
|
|
|
return ltv350qv_power(lcd, FB_BLANK_POWERDOWN);
|
|
}
|
|
|
|
static int ltv350qv_resume(struct spi_device *spi)
|
|
{
|
|
struct ltv350qv *lcd = dev_get_drvdata(&spi->dev);
|
|
|
|
return ltv350qv_power(lcd, FB_BLANK_UNBLANK);
|
|
}
|
|
#else
|
|
#define ltv350qv_suspend NULL
|
|
#define ltv350qv_resume NULL
|
|
#endif
|
|
|
|
/* Power down all displays on reboot, poweroff or halt */
|
|
static void ltv350qv_shutdown(struct spi_device *spi)
|
|
{
|
|
struct ltv350qv *lcd = dev_get_drvdata(&spi->dev);
|
|
|
|
ltv350qv_power(lcd, FB_BLANK_POWERDOWN);
|
|
}
|
|
|
|
static struct spi_driver ltv350qv_driver = {
|
|
.driver = {
|
|
.name = "ltv350qv",
|
|
.bus = &spi_bus_type,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
|
|
.probe = ltv350qv_probe,
|
|
.remove = __devexit_p(ltv350qv_remove),
|
|
.shutdown = ltv350qv_shutdown,
|
|
.suspend = ltv350qv_suspend,
|
|
.resume = ltv350qv_resume,
|
|
};
|
|
|
|
static int __init ltv350qv_init(void)
|
|
{
|
|
return spi_register_driver(<v350qv_driver);
|
|
}
|
|
|
|
static void __exit ltv350qv_exit(void)
|
|
{
|
|
spi_unregister_driver(<v350qv_driver);
|
|
}
|
|
module_init(ltv350qv_init);
|
|
module_exit(ltv350qv_exit);
|
|
|
|
MODULE_AUTHOR("Haavard Skinnemoen <hskinnemoen@atmel.com>");
|
|
MODULE_DESCRIPTION("Samsung LTV350QV LCD Driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("spi:ltv350qv");
|