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 } 179