drivers/media/usb/hdpvr/hdpvr-i2c.c

Source file repositories/reference/linux-study-clean/drivers/media/usb/hdpvr/hdpvr-i2c.c

File Facts

System
Linux kernel
Corpus path
drivers/media/usb/hdpvr/hdpvr-i2c.c
Extension
.c
Size
4635 bytes
Lines
193
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-only

/*
 * Hauppauge HD PVR USB driver
 *
 * Copyright (C) 2008      Janne Grunau (j@jannau.net)
 *
 * IR device registration code is
 * Copyright (C) 2010	Andy Walls <awalls@md.metrocast.net>
 */

#if IS_ENABLED(CONFIG_I2C)

#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/export.h>

#include "hdpvr.h"

#define CTRL_READ_REQUEST	0xb8
#define CTRL_WRITE_REQUEST	0x38

#define REQTYPE_I2C_READ	0xb1
#define REQTYPE_I2C_WRITE	0xb0
#define REQTYPE_I2C_WRITE_STATT	0xd0

#define Z8F0811_IR_TX_I2C_ADDR	0x70
#define Z8F0811_IR_RX_I2C_ADDR	0x71


struct i2c_client *hdpvr_register_ir_i2c(struct hdpvr_device *dev)
{
	struct IR_i2c_init_data *init_data = &dev->ir_i2c_init_data;
	struct i2c_board_info info = {
		I2C_BOARD_INFO("ir_z8f0811_hdpvr", Z8F0811_IR_RX_I2C_ADDR),
	};

	/* Our default information for ir-kbd-i2c.c to use */
	init_data->ir_codes = RC_MAP_HAUPPAUGE;
	init_data->internal_get_key_func = IR_KBD_GET_KEY_HAUP_XVR;
	init_data->type = RC_PROTO_BIT_RC5 | RC_PROTO_BIT_RC6_MCE |
			  RC_PROTO_BIT_RC6_6A_32;
	init_data->name = "HD-PVR";
	init_data->polling_interval = 405; /* ms, duplicated from Windows */
	info.platform_data = init_data;

	return i2c_new_client_device(&dev->i2c_adapter, &info);
}

static int hdpvr_i2c_read(struct hdpvr_device *dev, int bus,
			  unsigned char addr, char *wdata, int wlen,
			  char *data, int len)
{
	int ret;

	if ((len > sizeof(dev->i2c_buf)) || (wlen > sizeof(dev->i2c_buf)))
		return -EINVAL;

	if (wlen) {
		memcpy(dev->i2c_buf, wdata, wlen);
		ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
				      REQTYPE_I2C_WRITE, CTRL_WRITE_REQUEST,
				      (bus << 8) | addr, 0, dev->i2c_buf,
				      wlen, 1000);
		if (ret < 0)
			return ret;
	}

	ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
			      REQTYPE_I2C_READ, CTRL_READ_REQUEST,
			      (bus << 8) | addr, 0, dev->i2c_buf, len, 1000);

	if (ret == len) {
		memcpy(data, dev->i2c_buf, len);
		ret = 0;
	} else if (ret >= 0)
		ret = -EIO;

	return ret;
}

static int hdpvr_i2c_write(struct hdpvr_device *dev, int bus,
			   unsigned char addr, char *data, int len)
{
	int ret;

	if (len > sizeof(dev->i2c_buf))
		return -EINVAL;

	memcpy(dev->i2c_buf, data, len);

Annotation

Implementation Notes