path: root/drivers/media/dvb/frontends/cx24116.c

/*
    Conexant cx24116/cx24118 - DVBS/S2 Satellite demod/tuner driver

    Copyright (C) 2006-2008 Steven Toth <stoth@hauppauge.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; 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/*
 * Updates by Darron Broad 2007.
 *
 * March
 *      Fixed some bugs.
 *      Added diseqc support.
 *      Added corrected signal strength support.
 *
 * August
 *	Sync with legacy version.
 *	Some clean ups.
 */
/* Updates by Igor Liplianin
 *
 * September, 9th 2008
 *	Fixed locking on high symbol rates (>30000).
 */

#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/firmware.h>

#include "dvb_frontend.h"
#include "cx24116.h"

/*
 * Fetch firmware in the following manner.
 *
 * #!/bin/sh
 * wget ftp://167.206.143.11/outgoing/Oxford/88x_2_117_24275_1_INF.zip
 * unzip 88x_2_117_24275_1_INF.zip
 * dd if=Driver88/hcw88bda.sys of=dvb-fe-cx24116.fw skip=81768 bs=1 count=32522
 */
#define CX24116_DEFAULT_FIRMWARE "dvb-fe-cx24116.fw"
#define CX24116_SEARCH_RANGE_KHZ 5000

/* registers (TO BE COMPLETED) */
#define CX24116_REG_SIGNAL (0xd5)

/* arg buffer size */
#define CX24116_ARGLEN (0x1e)

/* arg offset for DiSEqC */
#define CX24116_DISEQC_BURST  (1)
#define CX24116_DISEQC_ARG2_2 (2)   /* unknown value=2 */
#define CX24116_DISEQC_ARG3_0 (3)   /* unknown value=0 */
#define CX24116_DISEQC_ARG4_0 (4)   /* unknown value=0 */
#define CX24116_DISEQC_MSGLEN (5)
#define CX24116_DISEQC_MSGOFS (6)

/* DiSEqC burst */
#define CX24116_DISEQC_MINI_A (0)
#define CX24116_DISEQC_MINI_B (1)

static int debug = 0;
#define dprintk(args...) \
	do { \
		if (debug) printk ("cx24116: " args); \
	} while (0)

enum cmds
{
	CMD_INIT_CMD10  = 0x10,
	CMD_TUNEREQUEST = 0x11,
	CMD_INIT_CMD13  = 0x13,
	CMD_INIT_CMD14  = 0x14,
	CMD_SEND_DISEQC = 0x21,
	CMD_SET_TONEPRE = 0x22,
	CMD_SET_TONE    = 0x23,
};

/* The Demod/Tuner can't easily provide these, we cache them */
struct cx24116_tuning
{
	u32 frequency;
	u32 symbol_rate;
	fe_spectral_inversion_t inversion;
	fe_code_rate_t fec;

	fe_modulation_t modulation;

	/* Demod values */
	u8 fec_val;
	u8 fec_mask;
	u8 inversion_val;
};

/* Basic commands that are sent to the firmware */
struct cx24116_cmd
{
	u8 len;
	u8 args[CX24116_ARGLEN];
};

struct cx24116_state
{
	struct i2c_adapter* i2c;
	const struct cx24116_config* config;

	struct dvb_frontend frontend;

	struct cx24116_tuning dcur;
	struct cx24116_tuning dnxt;

	u8 skip_fw_load;
	u8 burst;
};

static int cx24116_writereg(struct cx24116_state* state, int reg, int data)
{
	u8 buf[] = { reg, data };
	struct i2c_msg msg = { .addr = state->config->demod_address,
		.flags = 0, .buf = buf, .len = 2 };
	int err;

	if (debug>1)
		printk("cx24116: %s: write reg 0x%02x, value 0x%02x\n",
						__func__,reg, data);

	if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) {
		printk("%s: writereg error(err == %i, reg == 0x%02x,"
			 " value == 0x%02x)\n", __func__, err, reg, data);
		return -EREMOTEIO;
	}

	return 0;
}

/* Bulk byte writes to a single I2C address, for 32k firmware load */
static int cx24116_writeregN(struct cx24116_state* state, int reg, u8 *data, u16 len)
{
	int ret = -EREMOTEIO;
	struct i2c_msg msg;
	u8 *buf;

	buf = kmalloc(len + 1, GFP_KERNEL);
	if (buf == NULL) {
		printk("Unable to kmalloc\n");
		ret = -ENOMEM;
		goto error;
	}

	*(buf) = reg;
	memcpy(buf + 1, data, len);

	msg.addr = state->config->demod_address;
	msg.flags = 0;
	msg.buf = buf;
	msg.len = len + 1;

	if (debug>1)
		printk("cx24116: %s:  write regN 0x%02x, len = %d\n",
						__func__,reg, len);

	if ((ret = i2c_transfer(state->i2c, &msg, 1)) != 1) {
		printk("%s: writereg error(err == %i, reg == 0x%02x\n",
			 __func__, ret, reg);
		ret = -EREMOTEIO;
	}

error:
	kfree(buf);

	return ret;
}

static int cx24116_readreg(struct cx24116_state* state, u8 reg)
{
	int ret;
	u8 b0[] = { reg };
	u8 b1[] = { 0 };
	struct i2c_msg msg[] = {
		{ .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1