drivers/media/usb/as102/as10x_cmd.c

Source file repositories/reference/linux-study-clean/drivers/media/usb/as102/as10x_cmd.c

File Facts

System
Linux kernel
Corpus path
drivers/media/usb/as102/as10x_cmd.c
Extension
.c
Size
10770 bytes
Lines
405
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-or-later
/*
 * Abilis Systems Single DVB-T Receiver
 * Copyright (C) 2008 Pierrick Hascoet <pierrick.hascoet@abilis.com>
 * Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com>
 */

#include <linux/kernel.h>
#include "as102_drv.h"
#include "as10x_cmd.h"

/**
 * as10x_cmd_turn_on - send turn on command to AS10x
 * @adap:   pointer to AS10x bus adapter
 *
 * Return 0 when no error, < 0 in case of error.
 */
int as10x_cmd_turn_on(struct as10x_bus_adapter_t *adap)
{
	int error = AS10X_CMD_ERROR;
	struct as10x_cmd_t *pcmd, *prsp;

	pcmd = adap->cmd;
	prsp = adap->rsp;

	/* prepare command */
	as10x_cmd_build(pcmd, (++adap->cmd_xid),
			sizeof(pcmd->body.turn_on.req));

	/* fill command */
	pcmd->body.turn_on.req.proc_id = cpu_to_le16(CONTROL_PROC_TURNON);

	/* send command */
	if (adap->ops->xfer_cmd) {
		error = adap->ops->xfer_cmd(adap, (uint8_t *) pcmd,
					    sizeof(pcmd->body.turn_on.req) +
					    HEADER_SIZE,
					    (uint8_t *) prsp,
					    sizeof(prsp->body.turn_on.rsp) +
					    HEADER_SIZE);
	}

	if (error < 0)
		goto out;

	/* parse response */
	error = as10x_rsp_parse(prsp, CONTROL_PROC_TURNON_RSP);

out:
	return error;
}

/**
 * as10x_cmd_turn_off - send turn off command to AS10x
 * @adap:   pointer to AS10x bus adapter
 *
 * Return 0 on success or negative value in case of error.
 */
int as10x_cmd_turn_off(struct as10x_bus_adapter_t *adap)
{
	int error = AS10X_CMD_ERROR;
	struct as10x_cmd_t *pcmd, *prsp;

	pcmd = adap->cmd;
	prsp = adap->rsp;

	/* prepare command */
	as10x_cmd_build(pcmd, (++adap->cmd_xid),
			sizeof(pcmd->body.turn_off.req));

	/* fill command */
	pcmd->body.turn_off.req.proc_id = cpu_to_le16(CONTROL_PROC_TURNOFF);

	/* send command */
	if (adap->ops->xfer_cmd) {
		error = adap->ops->xfer_cmd(
			adap, (uint8_t *) pcmd,
			sizeof(pcmd->body.turn_off.req) + HEADER_SIZE,
			(uint8_t *) prsp,
			sizeof(prsp->body.turn_off.rsp) + HEADER_SIZE);
	}

	if (error < 0)
		goto out;

	/* parse response */
	error = as10x_rsp_parse(prsp, CONTROL_PROC_TURNOFF_RSP);

out:
	return error;

Annotation

Implementation Notes