drivers/media/dvb-frontends/cxd2880/cxd2880_top.c

Source file repositories/reference/linux-study-clean/drivers/media/dvb-frontends/cxd2880/cxd2880_top.c

File Facts

System
Linux kernel
Corpus path
drivers/media/dvb-frontends/cxd2880/cxd2880_top.c
Extension
.c
Size
46665 bytes
Lines
1958
Domain
Driver Families
Bucket
drivers/media
Inferred role
Driver Families: exported/initcall integration point
Status
integration 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 cxd2880_priv {
	struct cxd2880_tnrdmd tnrdmd;
	struct spi_device *spi;
	struct cxd2880_io regio;
	struct cxd2880_spi_device spi_device;
	struct cxd2880_spi cxd2880_spi;
	struct cxd2880_dvbt_tune_param dvbt_tune_param;
	struct cxd2880_dvbt2_tune_param dvbt2_tune_param;
	struct mutex *spi_mutex; /* For SPI access exclusive control */
	unsigned long pre_ber_update;
	unsigned long pre_ber_interval;
	unsigned long post_ber_update;
	unsigned long post_ber_interval;
	unsigned long ucblock_update;
	unsigned long ucblock_interval;
	enum fe_status s;
};

static int cxd2880_pre_bit_err_t(struct cxd2880_tnrdmd *tnrdmd,
				 u32 *pre_bit_err, u32 *pre_bit_count)
{
	u8 rdata[2];
	int ret;

	if (!tnrdmd || !pre_bit_err || !pre_bit_count)
		return -EINVAL;

	if (tnrdmd->diver_mode == CXD2880_TNRDMD_DIVERMODE_SUB)
		return -EINVAL;

	if (tnrdmd->state != CXD2880_TNRDMD_STATE_ACTIVE)
		return -EINVAL;

	if (tnrdmd->sys != CXD2880_DTV_SYS_DVBT)
		return -EINVAL;

	ret = slvt_freeze_reg(tnrdmd);
	if (ret)
		return ret;

	ret = tnrdmd->io->write_reg(tnrdmd->io,
				    CXD2880_IO_TGT_DMD,
				    0x00, 0x10);
	if (ret) {
		slvt_unfreeze_reg(tnrdmd);
		return ret;
	}

	ret = tnrdmd->io->read_regs(tnrdmd->io,
				    CXD2880_IO_TGT_DMD,
				    0x39, rdata, 1);
	if (ret) {
		slvt_unfreeze_reg(tnrdmd);
		return ret;
	}

	if ((rdata[0] & 0x01) == 0) {
		slvt_unfreeze_reg(tnrdmd);
		return -EAGAIN;
	}

	ret = tnrdmd->io->read_regs(tnrdmd->io,
				    CXD2880_IO_TGT_DMD,
				    0x22, rdata, 2);
	if (ret) {
		slvt_unfreeze_reg(tnrdmd);
		return ret;
	}

	*pre_bit_err = (rdata[0] << 8) | rdata[1];

	ret = tnrdmd->io->read_regs(tnrdmd->io,
				    CXD2880_IO_TGT_DMD,
				    0x6f, rdata, 1);
	if (ret) {
		slvt_unfreeze_reg(tnrdmd);
		return ret;
	}

	slvt_unfreeze_reg(tnrdmd);

	*pre_bit_count = ((rdata[0] & 0x07) == 0) ?
			 256 : (0x1000 << (rdata[0] & 0x07));

	return 0;
}

static int cxd2880_pre_bit_err_t2(struct cxd2880_tnrdmd *tnrdmd,
				  u32 *pre_bit_err,
				  u32 *pre_bit_count)

Annotation

Implementation Notes