path: root/drivers/media/dvb/dvb-usb/mxl111sf.c

/*
 * Copyright (C) 2010 Michael Krufky (mkrufky@kernellabs.com)
 *
 *   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, version 2.
 *
 * see Documentation/dvb/README.dvb-usb for more information
 */

#include <linux/vmalloc.h>
#include <linux/i2c.h>

#include "mxl111sf.h"
#include "mxl111sf-reg.h"
#include "mxl111sf-phy.h"
#include "mxl111sf-i2c.h"
#include "mxl111sf-gpio.h"

#include "mxl111sf-demod.h"
#include "mxl111sf-tuner.h"

#include "lgdt3305.h"

int dvb_usb_mxl111sf_debug;
module_param_named(debug, dvb_usb_mxl111sf_debug, int, 0644);
MODULE_PARM_DESC(debug, "set debugging level "
		 "(1=info, 2=xfer, 4=i2c, 8=reg, 16=adv (or-able)).");

int dvb_usb_mxl111sf_isoc;
module_param_named(isoc, dvb_usb_mxl111sf_isoc, int, 0644);
MODULE_PARM_DESC(isoc, "enable usb isoc xfer (0=bulk, 1=isoc).");

#define ANT_PATH_AUTO 0
#define ANT_PATH_EXTERNAL 1
#define ANT_PATH_INTERNAL 2

int dvb_usb_mxl111sf_rfswitch =
#if 0
		ANT_PATH_AUTO;
#else
		ANT_PATH_EXTERNAL;
#endif

module_param_named(rfswitch, dvb_usb_mxl111sf_rfswitch, int, 0644);
MODULE_PARM_DESC(rfswitch, "force rf switch position (0=auto, 1=ext, 2=int).");

DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);

#define deb_info(args...)   dprintk(dvb_usb_mxl111sf_debug, 0x13, args)
#define deb_reg(args...)    dprintk(dvb_usb_mxl111sf_debug, 0x08, args)
#define deb_adv(args...)    dprintk(dvb_usb_mxl111sf_debug, MXL_ADV_DBG, args)

int mxl111sf_ctrl_msg(struct dvb_usb_device *d,
		      u8 cmd, u8 *wbuf, int wlen, u8 *rbuf, int rlen)
{
	int wo = (rbuf == NULL || rlen == 0); /* write-only */
	int ret;
	u8 sndbuf[1+wlen];

	deb_adv("%s(wlen = %d, rlen = %d)\n", __func__, wlen, rlen);

	memset(sndbuf, 0, 1+wlen);

	sndbuf[0] = cmd;
	memcpy(&sndbuf[1], wbuf, wlen);

	ret = (wo) ? dvb_usb_generic_write(d, sndbuf, 1+wlen) :
		dvb_usb_generic_rw(d, sndbuf, 1+wlen, rbuf, rlen, 0);
	mxl_fail(ret);

	return ret;
}

/* ------------------------------------------------------------------------ */

#define MXL_CMD_REG_READ	0xaa
#define MXL_CMD_REG_WRITE	0x55

int mxl111sf_read_reg(struct mxl111sf_state *state, u8 addr, u8 *data)
{
	u8 buf[2];
	int ret;

	ret = mxl111sf_ctrl_msg(state->d, MXL_CMD_REG_READ, &addr, 1, buf, 2);
	if (mxl_fail(ret)) {
		mxl_debug("error reading reg: 0x%02x", addr);
		goto fail;
	}

	if (buf[0] == addr)
		*data = buf[1];
	else {
		err("invalid response reading reg: 0x%02x != 0x%02x, 0x%02x",
		    addr, buf[0], buf[1]);
		ret = -EINVAL;
	}

	deb_reg("R: (0x%02x, 0x%02x)\n", addr, *data);
fail:
	return ret;
}

int mxl111sf_write_reg(struct mxl111sf_state *state, u8 addr, u8 data)
{
	u8 buf[] = { addr, data };
	int ret;

	deb_reg("W: (0x%02x, 0x%02x)\n", addr, data);

	ret = mxl111sf_ctrl_msg(state->d, MXL_CMD_REG_WRITE, buf, 2, NULL, 0);
	if (mxl_fail(ret))
		err("error writing reg: 0x%02x, val: 0x%02x", addr, data);
	return ret;
}

/* ------------------------------------------------------------------------ */

int mxl111sf_write_reg_mask(struct mxl111sf_state *state,
				   u8 addr, u8 mask, u8 data)
{
	int ret;
	u8 val;

	if (mask != 0xff) {
		ret = mxl111sf_read_reg(state, addr, &val);
#if 1
		/* dont know why this usually errors out on the first try */
		if (mxl_fail(ret))
			err("error writing addr: 0x%02x, mask: 0x%02x, "
			    "data: 0x%02x, retrying...", addr, mask, data);

		ret = mxl111sf_read_reg(state, addr, &val);
#endif
		if (mxl_fail(ret))
			goto fail;
	}
	val &= ~mask;
	val