path: root/drivers/media/dvb/frontends/it913x-fe.c

/*
 *  Driver for it913x-fe Frontend
 *
 *  with support for on chip it9137 integral tuner
 *
 *  Copyright (C) 2011 Malcolm Priestley (tvboxspy@gmail.com)
 *  IT9137 Copyright (C) ITE Tech Inc.
 *
 *  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.=
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/types.h>

#include "dvb_frontend.h"
#include "it913x-fe.h"
#include "it913x-fe-priv.h"

static int it913x_debug;

module_param_named(debug, it913x_debug, int, 0644);
MODULE_PARM_DESC(debug, "set debugging level (1=info (or-able)).");

#define dprintk(level, args...) do { \
	if (level & it913x_debug) \
		printk(KERN_DEBUG "it913x-fe: " args); \
} while (0)

#define deb_info(args...)  dprintk(0x01, args)
#define debug_data_snipet(level, name, p) \
	  dprintk(level, name" (%02x%02x%02x%02x%02x%02x%02x%02x)", \
		*p, *(p+1), *(p+2), *(p+3), *(p+4), \
			*(p+5), *(p+6), *(p+7));

struct it913x_fe_state {
	struct dvb_frontend frontend;
	struct i2c_adapter *i2c_adap;
	u8 i2c_addr;
	u32 frequency;
	u8 adf;
	u32 crystalFrequency;
	u32 adcFrequency;
	u8 tuner_type;
	struct adctable *table;
	fe_status_t it913x_status;
	u16 tun_xtal;
	u8 tun_fdiv;
	u8 tun_clk_mode;
	u32 tun_fn_min;
};

static int it913x_read_reg(struct it913x_fe_state *state,
		u32 reg, u8 *data, u8 count)
{
	int ret;
	u8 pro = PRO_DMOD; /* All reads from demodulator */
	u8 b[4];
	struct i2c_msg msg[2] = {
		{ .addr = state->i2c_addr + (pro << 1), .flags = 0,
			.buf = b, .len = sizeof(b) },
		{ .addr = state->i2c_addr + (pro << 1), .flags = I2C_M_RD,
			.buf = data, .len = count }
	};
	b[0] = (u8) reg >> 24;
	b[1] = (u8)(reg >> 16) & 0xff;
	b[2] = (u8)(reg >> 8) & 0xff;
	b[3] = (u8) reg & 0xff;

	ret = i2c_transfer(state->i2c_adap, msg, 2);

	return ret;
}

static int it913x_read_reg_u8(struct it913x_fe_state *state, u32 reg)
{
	int ret;
	u8 b[1];
	ret = it913x_read_reg(state, reg, &b[0], sizeof(b));
	return (ret < 0) ? -ENODEV : b[0];
}

static int it913x_write(struct it913x_fe_state *state,
		u8 pro, u32 reg, u8 buf[], u8 count)
{
	u8 b[256];
	struct i2c_msg msg[1] = {
		{ .addr = state->i2c_addr + (pro << 1), .flags = 0,
		  .buf = b, .len = count + 4 }
	};
	int ret;

	b[0] = (u8) reg >> 24;
	b[1] = (u8)(reg >> 16) & 0xff;
	b[2] = (u8)(reg >> 8) & 0xff;
	b[3] = (u8) reg & 0xff;
	memcpy(&b[4], buf, count);

	ret = i2c_transfer(state->i2c_adap, msg, 1);

	if (ret < 0)
		return -EIO;

	return 0;
}

static int it913x_write_reg(struct it913x_fe_state *state,
		u8 pro, u32 reg, u32 data)
{
	int ret;
	u8 b[4];
	u8 s;

	b[0] = data >> 24;
	b[1] = (data >> 16) & 0xff;
	b[2] = (data >> 8) & 0xff;
	b[3] = data & 0xff;
	/* expand write as needed */
	if (data < 0x100)
		s = 3;
	else if (data < 0x1000)
		s = 2;
	else if (data < 0x100000)
		s = 1;
	else
		s = 0;

	ret = it913x_write(state, pro, reg, &b[s], sizeof(b) - s);

	return ret;
}

static int it913x_fe_script_loader(struct it913x_fe_state *state,
		struct it913xset *loadscript)
{
	int ret, i;
	if (loadscript == NULL)
		return -EINVAL;

	for (i = 0; i < 1000; ++i) {
		if (loadscript[i].pro == 0xff)
			brea