1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Driver for Silicon Labs C8051F300 microcontroller.
5 * It is used for LNB power control in TeVii S470,
6 * TBS 6920 PCIe DVB-S2 cards.
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
14 * Copyright (C) 2009 Igor M. Liplianin <liplianin@me.by>
18 #include "cx23885-f300.h"
20 #define F300_DATA GPIO_0
21 #define F300_RESET GPIO_1
22 #define F300_CLK GPIO_2
23 #define F300_BUSY GPIO_3
25 static void f300_set_line(struct cx23885_dev *dev, u32 line, u8 lvl)
27 cx23885_gpio_enable(dev, line, 1);
29 cx23885_gpio_set(dev, line);
31 cx23885_gpio_clear(dev, line);
34 static u8 f300_get_line(struct cx23885_dev *dev, u32 line)
36 cx23885_gpio_enable(dev, line, 0);
38 return cx23885_gpio_get(dev, line);
41 static void f300_send_byte(struct cx23885_dev *dev, u8 dta)
45 for (i = 0; i < 8; i++) {
46 f300_set_line(dev, F300_CLK, 0);
48 f300_set_line(dev, F300_DATA, (dta & 0x80) >> 7);/* msb first */
51 f300_set_line(dev, F300_CLK, 1);
56 static u8 f300_get_byte(struct cx23885_dev *dev)
60 for (i = 0; i < 8; i++) {
61 f300_set_line(dev, F300_CLK, 0);
64 f300_set_line(dev, F300_CLK, 1);
66 dta |= f300_get_line(dev, F300_DATA);/* msb first */
73 static u8 f300_xfer(struct dvb_frontend *fe, u8 *buf)
75 struct cx23885_tsport *port = fe->dvb->priv;
76 struct cx23885_dev *dev = port->dev;
80 for (i = 0; i < buf[0]; i++)
82 temp = (~temp + 1);/* get check sum */
83 buf[1 + buf[0]] = temp;
85 f300_set_line(dev, F300_RESET, 1);
86 f300_set_line(dev, F300_CLK, 1);
88 f300_set_line(dev, F300_DATA, 1);
92 f300_set_line(dev, F300_RESET, 0);/* begin to send data */
95 f300_send_byte(dev, 0xe0);/* the slave address is 0xe0, write */
100 for (i = 0; i < temp; i++)
101 f300_send_byte(dev, buf[i]);
103 f300_set_line(dev, F300_RESET, 1);/* sent data over */
104 f300_set_line(dev, F300_DATA, 1);
108 for (i = 0; ((i < 8) & (temp == 0)); i++) {
110 if (f300_get_line(dev, F300_BUSY) == 0)
115 pr_err("%s: timeout, the slave no response\n",
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...*/
121 f300_send_byte(dev, 0xe1);/* 0xe1 is Read */
123 temp = f300_get_byte(dev);/*get the data length */
127 for (i = 0; i < (temp + 1); i++)
128 f300_get_byte(dev);/* get data to empty buffer */
130 f300_set_line(dev, F300_RESET, 1);/* received data over */
131 f300_set_line(dev, F300_DATA, 1);
137 int f300_set_voltage(struct dvb_frontend *fe, enum fe_sec_voltage voltage)
142 buf[1] = 0x38;/* write port */
143 buf[2] = 0x01;/* A port, lnb power */
147 buf[3] = 0x01;/* power on */
148 buf[4] = 0x02;/* B port, H/V */
149 buf[5] = 0x00;/*13V v*/
154 buf[5] = 0x01;/* 18V h*/
156 case SEC_VOLTAGE_OFF:
157 buf[3] = 0x00;/* power off */
163 return f300_xfer(fe, buf);