drivers/media/dvb-frontends/cxd2880/cxd2880_tnrdmd_mon.c

Source file repositories/reference/linux-study-clean/drivers/media/dvb-frontends/cxd2880/cxd2880_tnrdmd_mon.c

File Facts

System
Linux kernel
Corpus path
drivers/media/dvb-frontends/cxd2880/cxd2880_tnrdmd_mon.c
Extension
.c
Size
3054 bytes
Lines
151
Domain
Driver Families
Bucket
drivers/media
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

// SPDX-License-Identifier: GPL-2.0
/*
 * cxd2880_tnrdmd_mon.c
 * Sony CXD2880 DVB-T2/T tuner + demodulator driver
 * common monitor functions
 *
 * Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation
 */

#include "cxd2880_common.h"
#include "cxd2880_tnrdmd_mon.h"

static const u8 rf_lvl_seq[2] = {
	0x80, 0x00,
};

int cxd2880_tnrdmd_mon_rf_lvl(struct cxd2880_tnrdmd *tnr_dmd,
			      int *rf_lvl_db)
{
	u8 rdata[2];
	int ret;

	if (!tnr_dmd || !rf_lvl_db)
		return -EINVAL;

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

	ret = tnr_dmd->io->write_reg(tnr_dmd->io,
				     CXD2880_IO_TGT_DMD,
				     0x00, 0x00);
	if (ret)
		return ret;

	ret = tnr_dmd->io->write_reg(tnr_dmd->io,
				     CXD2880_IO_TGT_DMD,
				     0x10, 0x01);
	if (ret)
		return ret;

	ret = tnr_dmd->io->write_reg(tnr_dmd->io,
				     CXD2880_IO_TGT_SYS,
				     0x00, 0x10);
	if (ret)
		return ret;

	ret = tnr_dmd->io->write_regs(tnr_dmd->io,
				      CXD2880_IO_TGT_SYS,
				      0x5b, rf_lvl_seq, 2);
	if (ret)
		return ret;

	usleep_range(2000, 3000);

	ret = tnr_dmd->io->write_reg(tnr_dmd->io,
				     CXD2880_IO_TGT_SYS,
				     0x00, 0x1a);
	if (ret)
		return ret;

	ret = tnr_dmd->io->read_regs(tnr_dmd->io,
				     CXD2880_IO_TGT_SYS,
				     0x15, rdata, 2);
	if (ret)
		return ret;

	if (rdata[0] || rdata[1])
		return -EINVAL;

	ret = tnr_dmd->io->read_regs(tnr_dmd->io,
				     CXD2880_IO_TGT_SYS,
				     0x11, rdata, 2);
	if (ret)
		return ret;

	*rf_lvl_db =
	    cxd2880_convert2s_complement((rdata[0] << 3) |
					 ((rdata[1] & 0xe0) >> 5), 11);

	*rf_lvl_db *= 125;

	ret = tnr_dmd->io->write_reg(tnr_dmd->io,
				     CXD2880_IO_TGT_DMD,
				     0x00, 0x00);
	if (ret)
		return ret;

	ret = tnr_dmd->io->write_reg(tnr_dmd->io,
				     CXD2880_IO_TGT_DMD,
				     0x10, 0x00);

Annotation

Implementation Notes