drivers/video/fbdev/omap/lcd_ams_delta.c

Source file repositories/reference/linux-study-clean/drivers/video/fbdev/omap/lcd_ams_delta.c

File Facts

System
Linux kernel
Corpus path
drivers/video/fbdev/omap/lcd_ams_delta.c
Extension
.c
Size
4111 bytes
Lines
176
Domain
Driver Families
Bucket
drivers/video
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

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 LCD_POWER_ON;
	else
		return LCD_POWER_OFF;
}

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 const 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_enable(struct lcd_panel *panel)
{
	gpiod_set_value(gpiod_ndisp, 1);
	gpiod_set_value(gpiod_vblen, 1);
	return 0;
}

static void ams_delta_panel_disable(struct lcd_panel *panel)
{
	gpiod_set_value(gpiod_vblen, 0);
	gpiod_set_value(gpiod_ndisp, 0);
}

static struct lcd_panel ams_delta_panel = {
	.name		= "ams-delta",
	.config		= 0,

	.bpp		= 12,
	.data_lines	= 16,
	.x_res		= 480,
	.y_res		= 320,
	.pixel_clock	= 4687,
	.hsw		= 3,
	.hfp		= 1,
	.hbp		= 1,
	.vsw		= 1,
	.vfp		= 0,
	.vbp		= 0,
	.pcd		= 0,
	.acb		= 37,

	.enable		= ams_delta_panel_enable,
	.disable	= ams_delta_panel_disable,
};

Annotation

Implementation Notes