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/*
* Driver for Silicon Labs C8051F300 microcontroller.
*
* It is used for LNB power control in TeVii S470,
* TBS 6920 PCIe DVB-S2 cards.
*
* Microcontroller connected to cx23885 GPIO pins:
* GPIO0 - data - P0.3 F300
* GPIO1 - reset - P0.2 F300
* GPIO2 - clk - P0.1 F300
* GPIO3 - busy - P0.0 F300
*
* Copyright (C) 2009 Igor M. Liplianin <liplianin@me.by>
*
* 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 "cx23885.h"
#define F300_DATA GPIO_0
#define F300_RESET GPIO_1
#define F300_CLK GPIO_2
#define F300_BUSY GPIO_3
static void f300_set_line(struct cx23885_dev *dev, u32 line, u8 lvl)
{
cx23885_gpio_enable(dev, line, 1);
if (lvl == 1)
cx23885_gpio_set(dev, line);
else
cx23885_gpio_clear(dev, line);
}
static u8 f300_get_line(struct cx23885_dev *dev, u32 line)
{
cx23885_gpio_enable(dev, line, 0);
return cx23885_gpio_get(dev, line);
}
static void f300_send_byte(struct cx23885_dev *dev, u8 dta)
{
u8 i;
for (i = 0; i < 8; i++) {
f300_set_line(dev, F300_CLK, 0);
udelay(30);
f300_set_line(dev, F300_DATA, (dta & 0x80) >> 7);/* msb first */
udelay(30);
dta <<= 1;
f300_set_line(dev, F300_CLK, 1);
udelay(30);
}
}
static u8 f300_get_byte(struct cx23885_dev *dev)
{
u8 i, dta = 0;
for (i = 0; i < 8; i++) {
f300_set_line(dev, F300_CLK, 0);
udelay(30);
dta <<= 1;
f300_set_line(dev, F300_CLK, 1);
udelay(30);
dta |= f300_get_line(dev, F300_DATA);/* msb first */
}
return dta;
}
static u8 f300_xfer(struct dvb_frontend *fe, u8 *buf)
{
struct cx23885_tsport *port = fe->dvb->priv;
struct cx23885_dev *dev = port->dev;
u8 i, temp, ret = 0;
temp = buf[0];
for (i = 0; i < buf[0]; i++)
temp += buf[i + 1];
temp = (~temp + 1);/* get check sum */
buf[1 + buf[0]] = temp;
f300_set_line(dev, F300_RESET, 1);
f300_set_line(dev, F300_CLK, 1);
udelay(30);
f300_set_line(dev, F300_DATA, 1);
msleep(1);
/* question: */
f300_set_line(dev, F300_RESET, 0);/* begin to send data */
msleep(1);
f300_send_byte(dev, 0xe0);/* the slave address is 0xe0, write */
msleep(1);
temp = buf[0];
temp += 2;
for (i = 0; i < temp; i++)
f300_send_byte(dev, buf[i]);
f300_set_line(dev, F300_RESET, 1);/* sent data over */
f300_set_line(dev, F300_DATA, 1);
/* answer: */
temp = 0;
for (i = 0; ((i < 8) & (temp == 0)); i++) {
msleep(1);
if (f300_get_line(dev, F300_BUSY) == 0)
temp = 1;
}
if (i > 7) {
printk(KERN_ERR "%s: timeout, the slave no response\n",
__func__);
ret = 1; /* timeout, the slave no response */
} else { /* the slave not busy, prepare for getting data */
f300_set_line(dev, F300_RESET, 0);/*ready...*/
msleep(1);
f300_send_byte(dev, 0xe1);/* 0xe1 is Read */
msleep(1);
temp = f300_get_byte(dev);/*get the data length */
if (temp > 14)
temp = 14;
for (i = 0; i < (temp + 1); i++)
f300_get_byte(dev);/* get data to empty buffer */
f300_set_line(dev, F300_RESET, 1);/* received data over */
f300_set_line(dev, F300_DATA, 1);
}
return ret;
}
int f300_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
{
u8 buf[16];
buf[0] = 0x05;
buf[1] = 0x38;/* write port */
buf[2] = 0x01;/* A port, lnb power */
switch (voltage) {
case SEC_VOLTAGE_13:
buf[3] = 0x01;/* power on */
buf[4] = 0x02;/* B port, H/V */
buf[5] = 0x00;/*13V v*/
break;
case SEC_VOLTAGE_18:
buf[3] = 0x01;
buf[4] = 0x02;
buf[5] = 0x01;/* 18V h*/
break;
case SEC_VOLTAGE_OFF:
buf[3] = 0x00;/* power off */
buf[4] = 0x00;
buf[5] = 0x00;
break;
}
return f300_xfer(fe, buf);
}
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