path: root/drivers/media/dvb/frontends/mt312.c

/*
    Driver for Zarlink VP310/MT312/ZL10313 Satellite Channel Decoder

    Copyright (C) 2003 Andreas Oberritter <obi@linuxtv.org>
    Copyright (C) 2008 Matthias Schwarzott <zzam@gentoo.org>

    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.

    References:
    http://products.zarlink.com/product_profiles/MT312.htm
    http://products.zarlink.com/product_profiles/SL1935.htm
*/

#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/slab.h>

#include "dvb_frontend.h"
#include "mt312_priv.h"
#include "mt312.h"


struct mt312_state {
	struct i2c_adapter *i2c;
	/* configuration settings */
	const struct mt312_config *config;
	struct dvb_frontend frontend;

	u8 id;
	unsigned long xtal;
	u8 freq_mult;
};

static int debug;
#define dprintk(args...) \
	do { \
		if (debug) \
			printk(KERN_DEBUG "mt312: " args); \
	} while (0)

#define MT312_PLL_CLK		10000000UL	/* 10 MHz */
#define MT312_PLL_CLK_10_111	10111000UL	/* 10.111 MHz */

static int mt312_read(struct mt312_state *state, const enum mt312_reg_addr reg,
		      u8 *buf, const size_t count)
{
	int ret;
	struct i2c_msg msg[2];
	u8 regbuf[1] = { reg };

	msg[0].addr = state->config->demod_address;
	msg[0].flags = 0;
	msg[0].buf = regbuf;
	msg[0].len = 1;
	msg[1].addr = state->config->demod_address;
	msg[1].flags = I2C_M_RD;
	msg[1].buf = buf;
	msg[1].len = count;

	ret = i2c_transfer(state->i2c, msg, 2);

	if (ret != 2) {
		printk(KERN_DEBUG "%s: ret == %d\n", __func__, ret);
		return -EREMOTEIO;
	}

	if (debug) {
		int i;
		dprintk("R(%d):", reg & 0x7f);
		for (i = 0; i < count; i++)
			printk(KERN_CONT " %02x", buf[i]);
		printk("\n");
	}

	return 0;
}

static int mt312_write(struct mt312_state *state, const enum mt312_reg_addr reg,
		       const u8 *src, const size_t count)
{
	int ret;
	u8 buf[count + 1];
	struct i2c_msg msg;

	if (debug) {
		int i;
		dprintk("W(%d):", reg & 0x7f);
		for (i = 0; i < count; i++)
			printk(KERN_CONT " %02x", src[i]);
		printk("\n");
	}

	buf[0] = reg;
	memcpy(&buf[1], src, count);

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

	ret = i2c_transfer(state->i2c, &msg, 1);

	if (ret != 1) {
		dprintk("%s: ret == %d\n", __func__, ret);
		return -EREMOTEIO;
	}

	return 0;
}

static inline int mt312_readreg(struct mt312_state *state,
				const enum mt312_reg_addr reg, u8 *val)
{
	return mt312_read(state, reg, val, 1);
}

static inline int mt312_writereg(struct mt312_state *state,
				 const enum mt312_reg_addr reg, const u8 val)
{
	return mt312_write(state, reg, &val, 1);
}

static inline u32 mt312_div(u32 a, u32 b)
{
	return (a + (b / 2)) / b;
}

static int mt312_reset(struct mt312_state *state, const u8 full)
{
	return mt312_writereg(state, RESET, full ? 0x80 : 0x40);
}

static int mt312_get_inversion(struct mt312_state *state,
			       fe_spectral_inversion_t *i)
{
	int ret;
	u8 vit_mode;

	ret = mt312_readreg(state, VIT_MODE, &vit_mode);
	if (ret < 0)
		return ret;

	if (vit_mode & 0x80)	/* auto inversion was used */
		*i = (vit_mode & 0x40) ? INVERSION_ON : INVERSION_OFF;

	return 0;
}

static int mt312_get_symbol_rate(struct mt312_state *state, u32 *sr)
{
	int ret;
	u8 sym_rate_h;
	u8 dec_ratio;
	u16 sym_rat_op;
	u16 monitor;
	u8 buf[2];

	ret = mt312_readreg(state, SYM_RATE_H, &sym_rate_h);
	if (ret < 0)
		return ret;

	if (sym_rate_h & 0x80) {
		/* symbol rate search was used */
		ret