2 * Driver for Silicon Labs C8051F300 microcontroller.
4 * It is used for LNB power control in TeVii S470,
5 * TBS 6920 PCIe DVB-S2 cards.
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
13 * Copyright (C) 2009 Igor M. Liplianin <liplianin@me.by>
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.
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
24 * GNU General Public License for more details.
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.
32 #include "cx23885-f300.h"
34 #define F300_DATA GPIO_0
35 #define F300_RESET GPIO_1
36 #define F300_CLK GPIO_2
37 #define F300_BUSY GPIO_3
39 static void f300_set_line(struct cx23885_dev *dev, u32 line, u8 lvl)
41 cx23885_gpio_enable(dev, line, 1);
43 cx23885_gpio_set(dev, line);
45 cx23885_gpio_clear(dev, line);
48 static u8 f300_get_line(struct cx23885_dev *dev, u32 line)
50 cx23885_gpio_enable(dev, line, 0);
52 return cx23885_gpio_get(dev, line);
55 static void f300_send_byte(struct cx23885_dev *dev, u8 dta)
59 for (i = 0; i < 8; i++) {
60 f300_set_line(dev, F300_CLK, 0);
62 f300_set_line(dev, F300_DATA, (dta & 0x80) >> 7);/* msb first */
65 f300_set_line(dev, F300_CLK, 1);
70 static u8 f300_get_byte(struct cx23885_dev *dev)
74 for (i = 0; i < 8; i++) {
75 f300_set_line(dev, F300_CLK, 0);
78 f300_set_line(dev, F300_CLK, 1);
80 dta |= f300_get_line(dev, F300_DATA);/* msb first */
87 static u8 f300_xfer(struct dvb_frontend *fe, u8 *buf)
89 struct cx23885_tsport *port = fe->dvb->priv;
90 struct cx23885_dev *dev = port->dev;
94 for (i = 0; i < buf[0]; i++)
96 temp = (~temp + 1);/* get check sum */
97 buf[1 + buf[0]] = temp;
99 f300_set_line(dev, F300_RESET, 1);
100 f300_set_line(dev, F300_CLK, 1);
102 f300_set_line(dev, F300_DATA, 1);
106 f300_set_line(dev, F300_RESET, 0);/* begin to send data */
109 f300_send_byte(dev, 0xe0);/* the slave address is 0xe0, write */
114 for (i = 0; i < temp; i++)
115 f300_send_byte(dev, buf[i]);
117 f300_set_line(dev, F300_RESET, 1);/* sent data over */
118 f300_set_line(dev, F300_DATA, 1);
122 for (i = 0; ((i < 8) & (temp == 0)); i++) {
124 if (f300_get_line(dev, F300_BUSY) == 0)
129 printk(KERN_ERR "%s: timeout, the slave no response\n",
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...*/
135 f300_send_byte(dev, 0xe1);/* 0xe1 is Read */
137 temp = f300_get_byte(dev);/*get the data length */
141 for (i = 0; i < (temp + 1); i++)
142 f300_get_byte(dev);/* get data to empty buffer */
144 f300_set_line(dev, F300_RESET, 1);/* received data over */
145 f300_set_line(dev, F300_DATA, 1);
151 int f300_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
156 buf[1] = 0x38;/* write port */
157 buf[2] = 0x01;/* A port, lnb power */
161 buf[3] = 0x01;/* power on */
162 buf[4] = 0x02;/* B port, H/V */
163 buf[5] = 0x00;/*13V v*/
168 buf[5] = 0x01;/* 18V h*/
170 case SEC_VOLTAGE_OFF:
171 buf[3] = 0x00;/* power off */
177 return f300_xfer(fe, buf);