path: root/drivers/media/usb/dvb-usb-v2/dvb_usb_core.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * DVB USB framework
 *
 * Copyright (C) 2004-6 Patrick Boettcher <patrick.boettcher@posteo.de>
 * Copyright (C) 2012 Antti Palosaari <crope@iki.fi>
 */

#include "dvb_usb_common.h"
#include <media/media-device.h>

static int dvb_usbv2_disable_rc_polling;
module_param_named(disable_rc_polling, dvb_usbv2_disable_rc_polling, int, 0644);
MODULE_PARM_DESC(disable_rc_polling,
		"disable remote control polling (default: 0)");
static int dvb_usb_force_pid_filter_usage;
module_param_named(force_pid_filter_usage, dvb_usb_force_pid_filter_usage,
		int, 0444);
MODULE_PARM_DESC(force_pid_filter_usage,
		"force all DVB USB devices to use a PID filter, if any (default: 0)");

static int dvb_usbv2_download_firmware(struct dvb_usb_device *d,
		const char *name)
{
	int ret;
	const struct firmware *fw;
	dev_dbg(&d->udev->dev, "%s:\n", __func__);

	if (!d->props->download_firmware) {
		ret = -EINVAL;
		goto err;
	}

	ret = request_firmware(&fw, name, &d->udev->dev);
	if (ret < 0) {
		dev_err(&d->udev->dev,
				"%s: Did not find the firmware file '%s' (status %d). You can use <kernel_dir>/scripts/get_dvb_firmware to get the firmware\n",
				KBUILD_MODNAME, name, ret);
		goto err;
	}

	dev_info(&d->udev->dev, "%s: downloading firmware from file '%s'\n",
			KBUILD_MODNAME, name);

	ret = d->props->download_firmware(d, fw);
	release_firmware(fw);
	if (ret < 0)
		goto err;

	return ret;
err:
	dev_dbg(&d->udev->dev, "%s: failed=%d\n", __func__, ret);
	return ret;
}

static int dvb_usbv2_i2c_init(struct dvb_usb_device *d)
{
	int ret;
	dev_dbg(&d->udev->dev, "%s:\n", __func__);

	if (!d->props->i2c_algo)
		return 0;

	strscpy(d->i2c_adap.name, d->name, sizeof(d->i2c_adap.name));
	d->i2c_adap.algo = d->props->i2c_algo;
	d->i2c_adap.dev.parent = &d->udev->dev;
	i2c_set_adapdata(&d->i2c_adap, d);

	ret = i2c_add_adapter(&d->i2c_adap);
	if (ret < 0) {
		d->i2c_adap.algo = NULL;
		goto err;
	}

	return 0;
err:
	dev_dbg(&d->udev->dev, "%s: failed=%d\n", __func__, ret);
	return ret;
}

static int dvb_usbv2_i2c_exit(struct dvb_usb_device *d)
{
	dev_dbg(&d->udev->dev, "%s:\n", __func__);

	if (d->i2c_adap.algo)
		i2c_del_adapter(&d->i2c_adap);

	return 0;
}

#if IS_ENABLED(CONFIG_RC_CORE)
static void dvb_usb_read_remote_control(struct work_struct *work)
{
	struct dvb_usb_device *d = container_of(work,
			struct dvb_usb_device, rc_query_work.work);
	int ret;

	/*
	 * When the parameter has been set to 1 via sysfs while the
	 * driver was running, or when bulk mode is enabled after IR init.
	 */
	if (dvb_usbv2_disable_rc_polling || d->rc.bulk_mode) {
		d->rc_polling_active = false;
		return;
	}

	ret = d->rc.query(d);
	if (ret < 0) {
		dev_err(&d->udev->dev, "%s: rc.query() failed=%d\n",
				KBUILD_MODNAME, ret);
		d->rc_polling_active = false;
		return; /* stop polling */
	}

	schedule_delayed_work(&d->rc_query_work,
			msecs_to_jiffies(d->rc.interval));
}

static int dvb_usbv2_remote_init(struct dvb_usb_device *d)
{
	int ret;
	struct rc_dev *dev;
	dev_dbg(&d->udev->dev, "%s:\n", __func__);

	if (dvb_usbv2_disable_rc_polling || !d->props->get_rc_config)
		return 0;

	d->rc.map_name = d->rc_map;
	ret = d->props->get_rc_config(d, &d->rc);
	if (ret < 0)
		goto err;

	/* disable rc when there is no keymap defined */
	if (!d->rc.map_name)
		return 0;