165 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*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 F30010 * GPIO1 - reset - P0.2 F30011 * GPIO2 - clk - P0.1 F30012 * GPIO3 - busy - P0.0 F30013 *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_021#define F300_RESET GPIO_122#define F300_CLK GPIO_223#define F300_BUSY GPIO_324 25static 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 else31 cx23885_gpio_clear(dev, line);32}33 34static 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 41static 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 56static 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 73static 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 137int 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