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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 | // SPDX-License-Identifier: GPL-2.0-or-later /* * 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> */ #include "cx23885.h" #include "cx23885-f300.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) { pr_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, enum fe_sec_voltage 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); } |