drivers/media/video/cx23885/cx23885-f300.c

   1 /*
   2  * Driver for Silicon Labs C8051F300 microcontroller.
   3  *
   4  * It is used for LNB power control in TeVii S470,
   5  * TBS 6920 PCIe DVB-S2 cards.
   6  *
   7  * Microcontroller connected to cx23885 GPIO pins:
   8  * GPIO0 - data         - P0.3 F300
   9  * GPIO1 - reset        - P0.2 F300
  10  * GPIO2 - clk          - P0.1 F300
  11  * GPIO3 - busy         - P0.0 F300
  12  *
  13  * Copyright (C) 2009 Igor M. Liplianin <liplianin@me.by>
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or
  18  * (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  *
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  29  */
  30
  31 #include "cx23885.h"
  32
  33 #define F300_DATA       GPIO_0
  34 #define F300_RESET      GPIO_1
  35 #define F300_CLK        GPIO_2
  36 #define F300_BUSY       GPIO_3
  37
  38 static void f300_set_line(struct cx23885_dev *dev, u32 line, u8 lvl)
  39 {
  40         cx23885_gpio_enable(dev, line, 1);
  41         if (lvl == 1)
  42                 cx23885_gpio_set(dev, line);
  43         else
  44                 cx23885_gpio_clear(dev, line);
  45 }
  46
  47 static u8 f300_get_line(struct cx23885_dev *dev, u32 line)
  48 {
  49         cx23885_gpio_enable(dev, line, 0);
  50
  51         return cx23885_gpio_get(dev, line);
  52 }
  53
  54 static void f300_send_byte(struct cx23885_dev *dev, u8 dta)
  55 {
  56         u8 i;
  57
  58         for (i = 0; i < 8; i++) {
  59                 f300_set_line(dev, F300_CLK, 0);
  60                 udelay(30);
  61                 f300_set_line(dev, F300_DATA, (dta & 0x80) >> 7);/* msb first */
  62                 udelay(30);
  63                 dta <<= 1;
  64                 f300_set_line(dev, F300_CLK, 1);
  65                 udelay(30);
  66         }
  67 }
  68
  69 static u8 f300_get_byte(struct cx23885_dev *dev)
  70 {
  71         u8 i, dta = 0;
  72
  73         for (i = 0; i < 8; i++) {
  74                 f300_set_line(dev, F300_CLK, 0);
  75                 udelay(30);
  76                 dta <<= 1;
  77                 f300_set_line(dev, F300_CLK, 1);
  78                 udelay(30);
  79                 dta |= f300_get_line(dev, F300_DATA);/* msb first */
  80
  81         }
  82
  83         return dta;
  84 }
  85
  86 static u8 f300_xfer(struct dvb_frontend *fe, u8 *buf)
  87 {
  88         struct cx23885_tsport *port = fe->dvb->priv;
  89         struct cx23885_dev *dev = port->dev;
  90         u8 i, temp, ret = 0;
  91
  92         temp = buf[0];
  93         for (i = 0; i < buf[0]; i++)
  94                 temp += buf[i + 1];
  95         temp = (~temp + 1);/* get check sum */
  96         buf[1 + buf[0]] = temp;
  97
  98         f300_set_line(dev, F300_RESET, 1);
  99         f300_set_line(dev, F300_CLK, 1);
 100         udelay(30);
 101         f300_set_line(dev, F300_DATA, 1);
 102         msleep(1);
 103
 104         /* question: */
 105         f300_set_line(dev, F300_RESET, 0);/* begin to send data */
 106         msleep(1);
 107
 108         f300_send_byte(dev, 0xe0);/* the slave address is 0xe0, write */
 109         msleep(1);
 110
 111         temp = buf[0];
 112         temp += 2;
 113         for (i = 0; i < temp; i++)
 114                 f300_send_byte(dev, buf[i]);
 115
 116         f300_set_line(dev, F300_RESET, 1);/* sent data over */
 117         f300_set_line(dev, F300_DATA, 1);
 118
 119         /* answer: */
 120         temp = 0;
 121         for (i = 0; ((i < 8) & (temp == 0)); i++) {
 122                 msleep(1);
 123                 if (f300_get_line(dev, F300_BUSY) == 0)
 124                         temp = 1;
 125         }
 126
 127         if (i > 7) {
 128                 printk(KERN_ERR "%s: timeout, the slave no response\n",
 129                                                                 __func__);
 130                 ret = 1; /* timeout, the slave no response */
 131         } else { /* the slave not busy, prepare for getting data */
 132                 f300_set_line(dev, F300_RESET, 0);/*ready...*/
 133                 msleep(1);
 134                 f300_send_byte(dev, 0xe1);/* 0xe1 is Read */
 135                 msleep(1);
 136                 temp = f300_get_byte(dev);/*get the data length */
 137                 if (temp > 14)
 138                         temp = 14;
 139
 140                 for (i = 0; i < (temp + 1); i++)
 141                         f300_get_byte(dev);/* get data to empty buffer */
 142
 143                 f300_set_line(dev, F300_RESET, 1);/* received data over */
 144                 f300_set_line(dev, F300_DATA, 1);
 145         }
 146
 147         return ret;
 148 }
 149
 150 int f300_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
 151 {
 152         u8 buf[16];
 153
 154         buf[0] = 0x05;
 155         buf[1] = 0x38;/* write port */
 156         buf[2] = 0x01;/* A port, lnb power */
 157
 158         switch (voltage) {
 159         case SEC_VOLTAGE_13:
 160                 buf[3] = 0x01;/* power on */
 161                 buf[4] = 0x02;/* B port, H/V */
 162                 buf[5] = 0x00;/*13V v*/
 163                 break;
 164         case SEC_VOLTAGE_18:
 165                 buf[3] = 0x01;
 166                 buf[4] = 0x02;
 167                 buf[5] = 0x01;/* 18V h*/
 168                 break;
 169         case SEC_VOLTAGE_OFF:
 170                 buf[3] = 0x00;/* power off */
 171                 buf[4] = 0x00;
 172                 buf[5] = 0x00;
 173                 break;
 174         }
 175
 176         return f300_xfer(fe, buf);
 177 }