path: root/drivers/media/dvb/dvb-usb/rtl28xxu.c

/*
 * Realtek RTL28xxU DVB USB driver
 *
 * Copyright (C) 2009 Antti Palosaari <crope@iki.fi>
 * Copyright (C) 2011 Antti Palosaari <crope@iki.fi>
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License along
 *    with this program; if not, write to the Free Software Foundation, Inc.,
 *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "rtl28xxu.h"

#include "rtl2830.h"

#include "qt1010.h"
#include "mt2060.h"
#include "mxl5005s.h"

/* debug */
static int dvb_usb_rtl28xxu_debug;
module_param_named(debug, dvb_usb_rtl28xxu_debug, int, 0644);
MODULE_PARM_DESC(debug, "set debugging level" DVB_USB_DEBUG_STATUS);
DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);

static int rtl28xxu_ctrl_msg(struct dvb_usb_device *d, struct rtl28xxu_req *req)
{
	int ret;
	unsigned int pipe;
	u8 requesttype;
	u8 *buf;

	buf = kmalloc(req->size, GFP_KERNEL);
	if (!buf) {
		ret = -ENOMEM;
		goto err;
	}

	if (req->index & CMD_WR_FLAG) {
		/* write */
		memcpy(buf, req->data, req->size);
		requesttype = (USB_TYPE_VENDOR | USB_DIR_OUT);
		pipe = usb_sndctrlpipe(d->udev, 0);
	} else {
		/* read */
		requesttype = (USB_TYPE_VENDOR | USB_DIR_IN);
		pipe = usb_rcvctrlpipe(d->udev, 0);
	}

	ret = usb_control_msg(d->udev, pipe, 0, requesttype, req->value,
			req->index, buf, req->size, 1000);
	if (ret > 0)
		ret = 0;

	deb_dump(0, requesttype, req->value, req->index, buf, req->size,
			deb_xfer);

	/* read request, copy returned data to return buf */
	if (!ret && requesttype == (USB_TYPE_VENDOR | USB_DIR_IN))
		memcpy(req->data, buf, req->size);

	kfree(buf);

	if (ret)
		goto err;

	return ret;
err:
	deb_info("%s: failed=%d\n", __func__, ret);
	return ret;
}

static int rtl2831_wr_regs(struct dvb_usb_device *d, u16 reg, u8 *val, int len)
{
	struct rtl28xxu_req req;

	if (reg < 0x3000)
		req.index = CMD_USB_WR;
	else if (reg < 0x4000)
		req.index = CMD_SYS_WR;
	else
		req.index = CMD_IR_WR;

	req.value = reg;
	req.size = len;
	req.data = val;

	return rtl28xxu_ctrl_msg(d, &req);
}

static int rtl2831_rd_regs(struct dvb_usb_device *d, u16 reg, u8 *val, int len)
{
	struct rtl28xxu_req req;

	if (reg < 0x3000)
		req.index = CMD_USB_RD;
	else if (reg < 0x4000)
		req.index = CMD_SYS_RD;
	else
		req.index = CMD_IR_RD;

	req.value = reg;
	req.size = len;
	req.data = val;

	return rtl28xxu_ctrl_msg(d, &req);
}

static int rtl2831_wr_reg(struct dvb_usb_device *d, u16 reg, u8 val)
{
	return rtl2831_wr_regs(d, reg, &val, 1);
}

static int rtl2831_rd_reg(struct dvb_usb_device *d, u16 reg, u8 *val)
{
	return rtl2831_rd_regs(d, reg, val, 1);
}

/* I2C */
static int rtl28xxu_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[],
	int num)
{
	int ret;
	struct dvb_usb_device *d = i2c_get_adapdata(adap);
	struct rtl28xxu_priv *priv = d->priv;
	struct rtl28xxu_req req;

	/*
	 * It is not known which are real I2C bus xfer limits, but testing
	 * with RTL2831U + MT2060 gives max RD 24 and max WR 22 bytes.
	 * TODO: find out RTL2832U lens
	 */

	/*
	 * I2C adapter logic looks rather complicated due to fact it handles
	 * three different access methods. Those methods are;
	 * 1) integrated demod access
	 * 2) old I2C access
	 * 3) new I2C access
	 *
	 * Used method is selected in order 1, 2, 3. Method 3 can handle all
	 * requests but there is two reasons why not use it always;
	 * 1) It is most expensive, usually two USB messages are needed
	 * 2) At least RTL2831U does not support it
	 *
	 * Method 3 is needed in case of I2C write+read (typical register read)
	 * where write is more than one byte.
	 */

	if (mutex_lock_interruptible(&d->i2c_mutex) < 0)
		return -EAGAIN;

	if