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omapfb: lcd_ams_delta: add support for contrast control

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The patch extends the Amstrad Delta LCD panel driver with optional support for
changing contrast using standard LCD class device API instead of setting it
silently to a default value at panel enable. It also allows for lowering power
consumption by turning off OMAP_PWL_CLK_ENABLE via lcd_ops.set_power callback.

Created and tested against linux-omap for-next,
commit 155a75d9725e66e5ec8a383822957dee52427057.

Signed-off-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>
This commit is contained in:
Janusz Krzysztofik 2009-12-11 13:21:46 +00:00 committed by Tomi Valkeinen
parent 3e9ff04408
commit e721032785
1 changed files with 89 additions and 4 deletions
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93
drivers/video/omap/lcd_ams_delta.c
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@ -24,6 +24,7 @@
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/lcd.h>
#include <plat/board-ams-delta.h>
#include <mach/hardware.h>
@ -32,6 +33,71 @@
#define AMS_DELTA_DEFAULT_CONTRAST 112
#define AMS_DELTA_MAX_CONTRAST 0x00FF
#define AMS_DELTA_LCD_POWER 0x0100
/* LCD class device section */
static int ams_delta_lcd;
static int ams_delta_lcd_set_power(struct lcd_device *dev, int power)
{
if (power == FB_BLANK_UNBLANK) {
if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER)) {
omap_writeb(ams_delta_lcd & AMS_DELTA_MAX_CONTRAST,
OMAP_PWL_ENABLE);
omap_writeb(1, OMAP_PWL_CLK_ENABLE);
ams_delta_lcd |= AMS_DELTA_LCD_POWER;
}
} else {
if (ams_delta_lcd & AMS_DELTA_LCD_POWER) {
omap_writeb(0, OMAP_PWL_ENABLE);
omap_writeb(0, OMAP_PWL_CLK_ENABLE);
ams_delta_lcd &= ~AMS_DELTA_LCD_POWER;
}
}
return 0;
}
static int ams_delta_lcd_set_contrast(struct lcd_device *dev, int value)
{
if ((value >= 0) && (value <= AMS_DELTA_MAX_CONTRAST)) {
omap_writeb(value, OMAP_PWL_ENABLE);
ams_delta_lcd &= ~AMS_DELTA_MAX_CONTRAST;
ams_delta_lcd |= value;
}
return 0;
}
#ifdef CONFIG_LCD_CLASS_DEVICE
static int ams_delta_lcd_get_power(struct lcd_device *dev)
{
if (ams_delta_lcd & AMS_DELTA_LCD_POWER)
return FB_BLANK_UNBLANK;
else
return FB_BLANK_POWERDOWN;
}
static int ams_delta_lcd_get_contrast(struct lcd_device *dev)
{
if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER))
return 0;
return ams_delta_lcd & AMS_DELTA_MAX_CONTRAST;
}
static struct lcd_ops ams_delta_lcd_ops = {
.get_power = ams_delta_lcd_get_power,
.set_power = ams_delta_lcd_set_power,
.get_contrast = ams_delta_lcd_get_contrast,
.set_contrast = ams_delta_lcd_set_contrast,
};
#endif
/* omapfb panel section */
static int ams_delta_panel_init(struct lcd_panel *panel,
struct omapfb_device *fbdev)
{
@ -48,10 +114,6 @@ static int ams_delta_panel_enable(struct lcd_panel *panel)
AMS_DELTA_LATCH2_LCD_NDISP);
ams_delta_latch2_write(AMS_DELTA_LATCH2_LCD_VBLEN,
AMS_DELTA_LATCH2_LCD_VBLEN);
omap_writeb(1, OMAP_PWL_CLK_ENABLE);
omap_writeb(AMS_DELTA_DEFAULT_CONTRAST, OMAP_PWL_ENABLE);
return 0;
}
@ -91,8 +153,31 @@ static struct lcd_panel ams_delta_panel = {
.get_caps = ams_delta_panel_get_caps,
};
/* platform driver section */
static int ams_delta_panel_probe(struct platform_device *pdev)
{
struct lcd_device *lcd_device = NULL;
#ifdef CONFIG_LCD_CLASS_DEVICE
int ret;
lcd_device = lcd_device_register("omapfb", &pdev->dev, NULL,
&ams_delta_lcd_ops);
if (IS_ERR(lcd_device)) {
ret = PTR_ERR(lcd_device);
dev_err(&pdev->dev, "failed to register device\n");
return ret;
}
platform_set_drvdata(pdev, lcd_device);
lcd_device->props.max_contrast = AMS_DELTA_MAX_CONTRAST;
#endif
ams_delta_lcd_set_contrast(lcd_device, AMS_DELTA_DEFAULT_CONTRAST);
ams_delta_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
omapfb_register_panel(&ams_delta_panel);
return 0;
}