drivers/gpu/drm/panel/panel-tpo-td028ttec1.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/panel/panel-tpo-td028ttec1.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/panel/panel-tpo-td028ttec1.c
Extension
.c
Size
10411 bytes
Lines
388
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 td028ttec1_panel {
	struct drm_panel panel;

	struct spi_device *spi;
};

#define to_td028ttec1_device(p) container_of(p, struct td028ttec1_panel, panel)

static int
jbt_ret_write_0(struct td028ttec1_panel *lcd, u8 reg, int *err)
{
	struct spi_device *spi = lcd->spi;
	u16 tx_buf = JBT_COMMAND | reg;
	int ret;

	if (err && *err)
		return *err;

	ret = spi_write(spi, (u8 *)&tx_buf, sizeof(tx_buf));
	if (ret < 0) {
		dev_err(&spi->dev, "%s: SPI write failed: %d\n", __func__, ret);
		if (err)
			*err = ret;
	}

	return ret;
}

static int noinline_for_stack
jbt_reg_write_1(struct td028ttec1_panel *lcd,
		u8 reg, u8 data, int *err)
{
	struct spi_device *spi = lcd->spi;
	u16 tx_buf[2];
	int ret;

	if (err && *err)
		return *err;

	tx_buf[0] = JBT_COMMAND | reg;
	tx_buf[1] = JBT_DATA | data;

	ret = spi_write(spi, (u8 *)tx_buf, sizeof(tx_buf));
	if (ret < 0) {
		dev_err(&spi->dev, "%s: SPI write failed: %d\n", __func__, ret);
		if (err)
			*err = ret;
	}

	return ret;
}

static int noinline_for_stack
jbt_reg_write_2(struct td028ttec1_panel *lcd,
		u8 reg, u16 data, int *err)
{
	struct spi_device *spi = lcd->spi;
	u16 tx_buf[3];
	int ret;

	if (err && *err)
		return *err;

	tx_buf[0] = JBT_COMMAND | reg;
	tx_buf[1] = JBT_DATA | (data >> 8);
	tx_buf[2] = JBT_DATA | (data & 0xff);

	ret = spi_write(spi, (u8 *)tx_buf, sizeof(tx_buf));
	if (ret < 0) {
		dev_err(&spi->dev, "%s: SPI write failed: %d\n", __func__, ret);
		if (err)
			*err = ret;
	}

	return ret;
}

static int td028ttec1_prepare(struct drm_panel *panel)
{
	struct td028ttec1_panel *lcd = to_td028ttec1_device(panel);
	unsigned int i;
	int ret = 0;

	/* Three times command zero */
	for (i = 0; i < 3; ++i) {
		jbt_ret_write_0(lcd, 0x00, &ret);
		usleep_range(1000, 2000);
	}

	/* deep standby out */

Annotation

Implementation Notes