drivers/media/pci/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 #include "cx23885-f300.h"
  33
  34 #define F300_DATA       GPIO_0
  35 #define F300_RESET      GPIO_1
  36 #define F300_CLK        GPIO_2
  37 #define F300_BUSY       GPIO_3
  38
  39 static void f300_set_line(struct cx23885_dev *dev, u32 line, u8 lvl)
  40 {
  41         cx23885_gpio_enable(dev, line, 1);
  42         if (lvl == 1)
  43                 cx23885_gpio_set(dev, line);
  44         else
  45                 cx23885_gpio_clear(dev, line);
  46 }
  47
  48 static u8 f300_get_line(struct cx23885_dev *dev, u32 line)
  49 {
  50         cx23885_gpio_enable(dev, line, 0);
  51
  52         return cx23885_gpio_get(dev, line);
  53 }
  54
  55 static void f300_send_byte(struct cx23885_dev *dev, u8 dta)
  56 {
  57         u8 i;
  58
  59         for (i = 0; i < 8; i++) {
  60                 f300_set_line(dev, F300_CLK, 0);
  61                 udelay(30);
  62                 f300_set_line(dev, F300_DATA, (dta & 0x80) >> 7);/* msb first */
  63                 udelay(30);
  64                 dta <<= 1;
  65                 f300_set_line(dev, F300_CLK, 1);
  66                 udelay(30);
  67         }
  68 }
  69
  70 static u8 f300_get_byte(struct cx23885_dev *dev)
  71 {
  72         u8 i, dta = 0;
  73
  74         for (i = 0; i < 8; i++) {
  75                 f300_set_line(dev, F300_CLK, 0);
  76                 udelay(30);
  77                 dta <<= 1;
  78                 f300_set_line(dev, F300_CLK, 1);
  79                 udelay(30);
  80                 dta |= f300_get_line(dev, F300_DATA);/* msb first */
  81
  82         }
  83
  84         return dta;
  85 }
  86
  87 static u8 f300_xfer(struct dvb_frontend *fe, u8 *buf)
  88 {
  89         struct cx23885_tsport *port = fe->dvb->priv;
  90         struct cx23885_dev *dev = port->dev;
  91         u8 i, temp, ret = 0;
  92
  93         temp = buf[0];
  94         for (i = 0; i < buf[0]; i++)
  95                 temp += buf[i + 1];
  96         temp = (~temp + 1);/* get check sum */
  97         buf[1 + buf[0]] = temp;
  98
  99         f300_set_line(dev, F300_RESET, 1);
 100         f300_set_line(dev, F300_CLK, 1);
 101         udelay(30);
 102         f300_set_line(dev, F300_DATA, 1);
 103         msleep(1);
 104
 105         /* question: */
 106         f300_set_line(dev, F300_RESET, 0);/* begin to send data */
 107         msleep(1);
 108
 109         f300_send_byte(dev, 0xe0);/* the slave address is 0xe0, write */
 110         msleep(1);
 111
 112         temp = buf[0];
 113         temp += 2;
 114         for (i = 0; i < temp; i++)
 115                 f300_send_byte(dev, buf[i]);
 116
 117         f300_set_line(dev, F300_RESET, 1);/* sent data over */
 118         f300_set_line(dev, F300_DATA, 1);
 119
 120         /* answer: */
 121         temp = 0;
 122         for (i = 0; ((i < 8) & (temp == 0)); i++) {
 123                 msleep(1);
 124                 if (f300_get_line(dev, F300_BUSY) == 0)
 125                         temp = 1;
 126         }
 127
 128         if (i > 7) {
 129                 printk(KERN_ERR "%s: timeout, the slave no response\n",
 130                                                                 __func__);
 131                 ret = 1; /* timeout, the slave no response */
 132         } else { /* the slave not busy, prepare for getting data */
 133                 f300_set_line(dev, F300_RESET, 0);/*ready...*/
 134                 msleep(1);
 135                 f300_send_byte(dev, 0xe1);/* 0xe1 is Read */
 136                 msleep(1);
 137                 temp = f300_get_byte(dev);/*get the data length */
 138                 if (temp > 14)
 139                         temp = 14;
 140
 141                 for (i = 0; i < (temp + 1); i++)
 142                         f300_get_byte(dev);/* get data to empty buffer */
 143
 144                 f300_set_line(dev, F300_RESET, 1);/* received data over */
 145                 f300_set_line(dev, F300_DATA, 1);
 146         }
 147
 148         return ret;
 149 }
 150
 151 int f300_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
 152 {
 153         u8 buf[16];
 154
 155         buf[0] = 0x05;
 156         buf[1] = 0x38;/* write port */
 157         buf[2] = 0x01;/* A port, lnb power */
 158
 159         switch (voltage) {
 160         case SEC_VOLTAGE_13:
 161                 buf[3] = 0x01;/* power on */
 162                 buf[4] = 0x02;/* B port, H/V */
 163                 buf[5] = 0x00;/*13V v*/
 164                 break;
 165         case SEC_VOLTAGE_18:
 166                 buf[3] = 0x01;
 167                 buf[4] = 0x02;
 168                 buf[5] = 0x01;/* 18V h*/
 169                 break;
 170         case SEC_VOLTAGE_OFF:
 171                 buf[3] = 0x00;/* power off */
 172                 buf[4] = 0x00;
 173                 buf[5] = 0x00;
 174                 break;
 175         }
 176
 177         return f300_xfer(fe, buf);
 178 }