drivers/gpu/drm/panel/panel-sharp-ls037v7dw01.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/panel/panel-sharp-ls037v7dw01.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/panel/panel-sharp-ls037v7dw01.c
Extension
.c
Size
5944 bytes
Lines
220
Domain
Driver Families
Bucket
drivers/gpu
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

struct ls037v7dw01_panel {
	struct drm_panel panel;
	struct platform_device *pdev;

	struct regulator *vdd;
	struct gpio_desc *resb_gpio;	/* low = reset active min 20 us */
	struct gpio_desc *ini_gpio;	/* high = power on */
	struct gpio_desc *mo_gpio;	/* low = 480x640, high = 240x320 */
	struct gpio_desc *lr_gpio;	/* high = conventional horizontal scanning */
	struct gpio_desc *ud_gpio;	/* high = conventional vertical scanning */
};

#define to_ls037v7dw01_device(p) \
	container_of(p, struct ls037v7dw01_panel, panel)

static int ls037v7dw01_disable(struct drm_panel *panel)
{
	struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);

	gpiod_set_value_cansleep(lcd->ini_gpio, 0);
	gpiod_set_value_cansleep(lcd->resb_gpio, 0);

	/* Wait at least 5 vsyncs after disabling the LCD. */
	msleep(100);

	return 0;
}

static int ls037v7dw01_unprepare(struct drm_panel *panel)
{
	struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);

	regulator_disable(lcd->vdd);
	return 0;
}

static int ls037v7dw01_prepare(struct drm_panel *panel)
{
	struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);
	int ret;

	ret = regulator_enable(lcd->vdd);
	if (ret < 0)
		dev_err(&lcd->pdev->dev, "%s: failed to enable regulator\n",
			__func__);

	return ret;
}

static int ls037v7dw01_enable(struct drm_panel *panel)
{
	struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel);

	/* Wait couple of vsyncs before enabling the LCD. */
	msleep(50);

	gpiod_set_value_cansleep(lcd->resb_gpio, 1);
	gpiod_set_value_cansleep(lcd->ini_gpio, 1);

	return 0;
}

static const struct drm_display_mode ls037v7dw01_mode = {
	.clock = 19200,
	.hdisplay = 480,
	.hsync_start = 480 + 1,
	.hsync_end = 480 + 1 + 2,
	.htotal = 480 + 1 + 2 + 28,
	.vdisplay = 640,
	.vsync_start = 640 + 1,
	.vsync_end = 640 + 1 + 1,
	.vtotal = 640 + 1 + 1 + 1,
	.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
	.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
	.width_mm = 56,
	.height_mm = 75,
};

static int ls037v7dw01_get_modes(struct drm_panel *panel,
				 struct drm_connector *connector)
{
	struct drm_display_mode *mode;

	mode = drm_mode_duplicate(connector->dev, &ls037v7dw01_mode);
	if (!mode)
		return -ENOMEM;

	drm_mode_set_name(mode);
	drm_mode_probed_add(connector, mode);

Annotation

Implementation Notes