sound/soc/sdca/sdca_hid.c

Source file repositories/reference/linux-study-clean/sound/soc/sdca/sdca_hid.c

File Facts

System
Linux kernel
Corpus path
sound/soc/sdca/sdca_hid.c
Extension
.c
Size
4040 bytes
Lines
169
Domain
Driver Families
Bucket
sound/soc
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

// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)

/*
 * The MIPI SDCA specification is available for public downloads at
 * https://www.mipi.org/mipi-sdca-v1-0-download
 */

#include <linux/acpi.h>
#include <linux/byteorder/generic.h>
#include <linux/cleanup.h>
#include <linux/device.h>
#include <linux/dev_printk.h>
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/soundwire/sdw.h>
#include <linux/types.h>
#include <sound/sdca.h>
#include <sound/sdca_function.h>
#include <sound/sdca_hid.h>
#include <sound/sdca_interrupts.h>
#include <sound/sdca_ump.h>

static int sdwhid_parse(struct hid_device *hid)
{
	struct sdca_entity *entity = hid->driver_data;
	unsigned int rsize;
	int ret;

	rsize = le16_to_cpu(entity->hide.hid_desc.rpt_desc.wDescriptorLength);

	if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
		dev_err(&hid->dev, "invalid size of report descriptor (%u)\n", rsize);
		return -EINVAL;
	}

	ret = hid_parse_report(hid, entity->hide.hid_report_desc, rsize);

	if (!ret)
		return 0;

	dev_err(&hid->dev, "parsing report descriptor failed\n");
	return ret;
}

static int sdwhid_start(struct hid_device *hid)
{
	return 0;
}

static void sdwhid_stop(struct hid_device *hid)
{
}

static int sdwhid_raw_request(struct hid_device *hid, unsigned char reportnum,
			      __u8 *buf, size_t len, unsigned char rtype, int reqtype)
{
	switch (reqtype) {
	case HID_REQ_GET_REPORT:
		/* not implemented yet */
		return 0;
	case HID_REQ_SET_REPORT:
		/* not implemented yet */
		return 0;
	default:
		return -EIO;
	}
}

static int sdwhid_open(struct hid_device *hid)
{
	return 0;
}

static void sdwhid_close(struct hid_device *hid)
{
}

static const struct hid_ll_driver sdw_hid_driver = {
	.parse = sdwhid_parse,
	.start = sdwhid_start,
	.stop = sdwhid_stop,
	.open = sdwhid_open,
	.close = sdwhid_close,
	.raw_request = sdwhid_raw_request,
};

int sdca_add_hid_device(struct device *dev, struct sdw_slave *sdw,
			struct sdca_entity *entity)
{

Annotation

Implementation Notes