path: root/drivers/media/usb/dvb-usb/dib0700_core.c

// SPDX-License-Identifier: GPL-2.0-only
/* Linux driver for devices based on the DiBcom DiB0700 USB bridge
 *
 *  Copyright (C) 2005-6 DiBcom, SA
 */
#include "dib0700.h"

/* debug */
int dvb_usb_dib0700_debug;
module_param_named(debug,dvb_usb_dib0700_debug, int, 0644);
MODULE_PARM_DESC(debug, "set debugging level (1=info,2=fw,4=fwdata,8=data (or-able))." DVB_USB_DEBUG_STATUS);

static int nb_packet_buffer_size = 21;
module_param(nb_packet_buffer_size, int, 0644);
MODULE_PARM_DESC(nb_packet_buffer_size,
	"Set the dib0700 driver data buffer size. This parameter corresponds to the number of TS packets. The actual size of the data buffer corresponds to this parameter multiplied by 188 (default: 21)");

DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);


int dib0700_get_version(struct dvb_usb_device *d, u32 *hwversion,
			u32 *romversion, u32 *ramversion, u32 *fwtype)
{
	struct dib0700_state *st = d->priv;
	int ret;

	if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
		err("could not acquire lock");
		return -EINTR;
	}

	ret = usb_control_msg(d->udev, usb_rcvctrlpipe(d->udev, 0),
				  REQUEST_GET_VERSION,
				  USB_TYPE_VENDOR | USB_DIR_IN, 0, 0,
				  st->buf, 16, USB_CTRL_GET_TIMEOUT);
	if (hwversion != NULL)
		*hwversion  = (st->buf[0] << 24)  | (st->buf[1] << 16)  |
			(st->buf[2] << 8)  | st->buf[3];
	if (romversion != NULL)
		*romversion = (st->buf[4] << 24)  | (st->buf[5] << 16)  |
			(st->buf[6] << 8)  | st->buf[7];
	if (ramversion != NULL)
		*ramversion = (st->buf[8] << 24)  | (st->buf[9] << 16)  |
			(st->buf[10] << 8) | st->buf[11];
	if (fwtype != NULL)
		*fwtype     = (st->buf[12] << 24) | (st->buf[13] << 16) |
			(st->buf[14] << 8) | st->buf[15];
	mutex_unlock(&d->usb_mutex);
	return ret;
}

/* expecting rx buffer: request data[0] data[1] ... data[2] */
static int dib0700_ctrl_wr(struct dvb_usb_device *d, u8 *tx, u8 txlen)
{
	int status;

	deb_data(">>> ");
	debug_dump(tx, txlen, deb_data);

	status = usb_control_msg(d->udev, usb_sndctrlpipe(d->udev,0),
		tx[0], USB_TYPE_VENDOR | USB_DIR_OUT, 0, 0, tx, txlen,
		USB_CTRL_GET_TIMEOUT);

	if (status != txlen)
		deb_data("ep 0 write error (status = %d, len: %d)\n",status,txlen);

	return status < 0 ? status : 0;
}

/* expecting tx buffer: request data[0] ... data[n] (n <= 4) */
int dib0700_ctrl_rd(struct dvb_usb_device *d, u8 *tx, u8 txlen, u8 *rx, u8 rxlen)
{
	u16 index, value;
	int status;

	if (txlen < 2) {
		err("tx buffer length is smaller than 2. Makes no sense.");
		return -EINVAL;
	}
	if (txlen > 4) {
		err("tx buffer length is larger than 4. Not supported.");
		return -EINVAL;
	}

	deb_data(">>> ");
	debug_dump(tx,txlen,deb_data);

	value = ((txlen - 2) << 8) | tx[1];
	index = 0;
	if (txlen > 2)
		index |= (tx[2] << 8);
	if (txlen > 3)
		index |= tx[3];

	status = usb_control_msg(d->udev, usb_rcvctrlpipe(d->udev,0), tx[0],
			USB_TYPE_VENDOR | USB_DIR_IN, value, index, rx, rxlen,
			USB_CTRL_GET_TIMEOUT);

	if (status < 0)
		deb_info("ep 0 read error (status = %d)\n",status);

	deb_data("<<< ");
	debug_dump(rx, rxlen, deb_data);

	return status; /* length in case of success */
}

int dib0700_set_gpio(struct dvb_usb_device *d, enum dib07x0_gpios gpio, u8 gpio_dir, u8 gpio_val)
{
	struct dib0700_state *st = d->priv;
	int ret;

	if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
		err("could not acquire lock");
		return -EINTR;
	}

	st->buf[0] = REQUEST_SET_GPIO;
	st->buf[1] = gpio;
	st->buf[2] = ((gpio_dir & 0x01) << 7) | ((gpio_val & 0x01) << 6);

	ret = dib0700_ctrl_wr(d, st->buf, 3);

	mutex_unlock(&d->usb_mutex);
	return ret;
}

static int dib0700_set_usb_xfer_len(struct dvb_usb_device *d, u16 nb_ts_packets)
{
	struct dib0700_state *st = d->priv;
	int ret;

	if (st->fw_version >= 0x10201) {
		if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
			err("could not acquire lock");
			return -EINTR;
		}

		st->buf[0] = REQUEST_SET_USB_XFER_LEN;
		st->buf[1] = (nb_ts_packets >> 8) & 0xff;
		st->buf[2] = nb_ts_packets & 0xff;

		deb_info("set the USB xfer len to %i Ts packet\n", nb_ts_packets);

		ret = dib0700_ctrl_wr(d, st->buf, 3);
		mutex_unlock(&d->usb_mutex);
	} else {