1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Driver for Silicon Labs C8051F300 microcontroller. 4 * 5 * It is used for LNB power control in TeVii S470, 6 * TBS 6920 PCIe DVB-S2 cards. 7 * 8 * Microcontroller connected to cx23885 GPIO pins: 9 * GPIO0 - data - P0.3 F300 10 * GPIO1 - reset - P0.2 F300 11 * GPIO2 - clk - P0.1 F300 12 * GPIO3 - busy - P0.0 F300 13 * 14 * Copyright (C) 2009 Igor M. Liplianin <liplianin@me.by> 15 */ 16 17 #include "cx23885.h" 18 #include "cx23885-f300.h" 19 20 #define F300_DATA GPIO_0 21 #define F300_RESET GPIO_1 22 #define F300_CLK GPIO_2 23 #define F300_BUSY GPIO_3 24 25 static void f300_set_line(struct cx23885_dev *dev, u32 line, u8 lvl) 26 { 27 cx23885_gpio_enable(dev, line, 1); 28 if (lvl == 1) 29 cx23885_gpio_set(dev, line); 30 else 31 cx23885_gpio_clear(dev, line); 32 } 33 34 static u8 f300_get_line(struct cx23885_dev *dev, u32 line) 35 { 36 cx23885_gpio_enable(dev, line, 0); 37 38 return cx23885_gpio_get(dev, line); 39 } 40 41 static void f300_send_byte(struct cx23885_dev *dev, u8 dta) 42 { 43 u8 i; 44 45 for (i = 0; i < 8; i++) { 46 f300_set_line(dev, F300_CLK, 0); 47 udelay(30); 48 f300_set_line(dev, F300_DATA, (dta & 0x80) >> 7);/* msb first */ 49 udelay(30); 50 dta <<= 1; 51 f300_set_line(dev, F300_CLK, 1); 52 udelay(30); 53 } 54 } 55 56 static u8 f300_get_byte(struct cx23885_dev *dev) 57 { 58 u8 i, dta = 0; 59 60 for (i = 0; i < 8; i++) { 61 f300_set_line(dev, F300_CLK, 0); 62 udelay(30); 63 dta <<= 1; 64 f300_set_line(dev, F300_CLK, 1); 65 udelay(30); 66 dta |= f300_get_line(dev, F300_DATA);/* msb first */ 67 68 } 69 70 return dta; 71 } 72 73 static u8 f300_xfer(struct dvb_frontend *fe, u8 *buf) 74 { 75 struct cx23885_tsport *port = fe->dvb->priv; 76 struct cx23885_dev *dev = port->dev; 77 u8 i, temp, ret = 0; 78 79 temp = buf[0]; 80 for (i = 0; i < buf[0]; i++) 81 temp += buf[i + 1]; 82 temp = (~temp + 1);/* get check sum */ 83 buf[1 + buf[0]] = temp; 84 85 f300_set_line(dev, F300_RESET, 1); 86 f300_set_line(dev, F300_CLK, 1); 87 udelay(30); 88 f300_set_line(dev, F300_DATA, 1); 89 msleep(1); 90 91 /* question: */ 92 f300_set_line(dev, F300_RESET, 0);/* begin to send data */ 93 msleep(1); 94 95 f300_send_byte(dev, 0xe0);/* the slave address is 0xe0, write */ 96 msleep(1); 97 98 temp = buf[0]; 99 temp += 2; 100 for (i = 0; i < temp; i++) 101 f300_send_byte(dev, buf[i]); 102 103 f300_set_line(dev, F300_RESET, 1);/* sent data over */ 104 f300_set_line(dev, F300_DATA, 1); 105 106 /* answer: */ 107 temp = 0; 108 for (i = 0; ((i < 8) & (temp == 0)); i++) { 109 msleep(1); 110 if (f300_get_line(dev, F300_BUSY) == 0) 111 temp = 1; 112 } 113 114 if (i > 7) { 115 pr_err("%s: timeout, the slave no response\n", 116 __func__); 117 ret = 1; /* timeout, the slave no response */ 118 } else { /* the slave not busy, prepare for getting data */ 119 f300_set_line(dev, F300_RESET, 0);/*ready...*/ 120 msleep(1); 121 f300_send_byte(dev, 0xe1);/* 0xe1 is Read */ 122 msleep(1); 123 temp = f300_get_byte(dev);/*get the data length */ 124 if (temp > 14) 125 temp = 14; 126 127 for (i = 0; i < (temp + 1); i++) 128 f300_get_byte(dev);/* get data to empty buffer */ 129 130 f300_set_line(dev, F300_RESET, 1);/* received data over */ 131 f300_set_line(dev, F300_DATA, 1); 132 } 133 134 return ret; 135 } 136 137 int f300_set_voltage(struct dvb_frontend *fe, enum fe_sec_voltage voltage) 138 { 139 u8 buf[16]; 140 141 buf[0] = 0x05; 142 buf[1] = 0x38;/* write port */ 143 buf[2] = 0x01;/* A port, lnb power */ 144 145 switch (voltage) { 146 case SEC_VOLTAGE_13: 147 buf[3] = 0x01;/* power on */ 148 buf[4] = 0x02;/* B port, H/V */ 149 buf[5] = 0x00;/*13V v*/ 150 break; 151 case SEC_VOLTAGE_18: 152 buf[3] = 0x01; 153 buf[4] = 0x02; 154 buf[5] = 0x01;/* 18V h*/ 155 break; 156 case SEC_VOLTAGE_OFF: 157 buf[3] = 0x00;/* power off */ 158 buf[4] = 0x00; 159 buf[5] = 0x00; 160 break; 161 } 162 163 return f300_xfer(fe, buf); 164 } 165