1 /*
2 * Driver for Silicon Labs C8051F300 microcontroller.
3 *
4 * It is used for LNB power control in TeVii S470,
5 * TBS 6920 PCIe DVB-S2 cards.
6 *
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
12 *
13 * Copyright (C) 2009 Igor M. Liplianin <liplianin@me.by>
14 *
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.
19 *
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
23 *
24 * GNU General Public License for more details.
25 *
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.
29 */
30
31 #include "cx23885.h"
32
33 #define F300_DATA GPIO_0
34 #define F300_RESET GPIO_1
35 #define F300_CLK GPIO_2
36 #define F300_BUSY GPIO_3
37
f300_set_line(struct cx23885_dev * dev,u32 line,u8 lvl)38 static void f300_set_line(struct cx23885_dev *dev, u32 line, u8 lvl)
39 {
40 cx23885_gpio_enable(dev, line, 1);
41 if (lvl == 1)
42 cx23885_gpio_set(dev, line);
43 else
44 cx23885_gpio_clear(dev, line);
45 }
46
f300_get_line(struct cx23885_dev * dev,u32 line)47 static u8 f300_get_line(struct cx23885_dev *dev, u32 line)
48 {
49 cx23885_gpio_enable(dev, line, 0);
50
51 return cx23885_gpio_get(dev, line);
52 }
53
f300_send_byte(struct cx23885_dev * dev,u8 dta)54 static void f300_send_byte(struct cx23885_dev *dev, u8 dta)
55 {
56 u8 i;
57
58 for (i = 0; i < 8; i++) {
59 f300_set_line(dev, F300_CLK, 0);
60 udelay(30);
61 f300_set_line(dev, F300_DATA, (dta & 0x80) >> 7);/* msb first */
62 udelay(30);
63 dta <<= 1;
64 f300_set_line(dev, F300_CLK, 1);
65 udelay(30);
66 }
67 }
68
f300_get_byte(struct cx23885_dev * dev)69 static u8 f300_get_byte(struct cx23885_dev *dev)
70 {
71 u8 i, dta = 0;
72
73 for (i = 0; i < 8; i++) {
74 f300_set_line(dev, F300_CLK, 0);
75 udelay(30);
76 dta <<= 1;
77 f300_set_line(dev, F300_CLK, 1);
78 udelay(30);
79 dta |= f300_get_line(dev, F300_DATA);/* msb first */
80
81 }
82
83 return dta;
84 }
85
f300_xfer(struct dvb_frontend * fe,u8 * buf)86 static u8 f300_xfer(struct dvb_frontend *fe, u8 *buf)
87 {
88 struct cx23885_tsport *port = fe->dvb->priv;
89 struct cx23885_dev *dev = port->dev;
90 u8 i, temp, ret = 0;
91
92 temp = buf[0];
93 for (i = 0; i < buf[0]; i++)
94 temp += buf[i + 1];
95 temp = (~temp + 1);/* get check sum */
96 buf[1 + buf[0]] = temp;
97
98 f300_set_line(dev, F300_RESET, 1);
99 f300_set_line(dev, F300_CLK, 1);
100 udelay(30);
101 f300_set_line(dev, F300_DATA, 1);
102 msleep(1);
103
104 /* question: */
105 f300_set_line(dev, F300_RESET, 0);/* begin to send data */
106 msleep(1);
107
108 f300_send_byte(dev, 0xe0);/* the slave address is 0xe0, write */
109 msleep(1);
110
111 temp = buf[0];
112 temp += 2;
113 for (i = 0; i < temp; i++)
114 f300_send_byte(dev, buf[i]);
115
116 f300_set_line(dev, F300_RESET, 1);/* sent data over */
117 f300_set_line(dev, F300_DATA, 1);
118
119 /* answer: */
120 temp = 0;
121 for (i = 0; ((i < 8) & (temp == 0)); i++) {
122 msleep(1);
123 if (f300_get_line(dev, F300_BUSY) == 0)
124 temp = 1;
125 }
126
127 if (i > 7) {
128 printk(KERN_ERR "%s: timeout, the slave no response\n",
129 __func__);
130 ret = 1; /* timeout, the slave no response */
131 } else { /* the slave not busy, prepare for getting data */
132 f300_set_line(dev, F300_RESET, 0);/*ready...*/
133 msleep(1);
134 f300_send_byte(dev, 0xe1);/* 0xe1 is Read */
135 msleep(1);
136 temp = f300_get_byte(dev);/*get the data length */
137 if (temp > 14)
138 temp = 14;
139
140 for (i = 0; i < (temp + 1); i++)
141 f300_get_byte(dev);/* get data to empty buffer */
142
143 f300_set_line(dev, F300_RESET, 1);/* received data over */
144 f300_set_line(dev, F300_DATA, 1);
145 }
146
147 return ret;
148 }
149
f300_set_voltage(struct dvb_frontend * fe,fe_sec_voltage_t voltage)150 int f300_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
151 {
152 u8 buf[16];
153
154 buf[0] = 0x05;
155 buf[1] = 0x38;/* write port */
156 buf[2] = 0x01;/* A port, lnb power */
157
158 switch (voltage) {
159 case SEC_VOLTAGE_13:
160 buf[3] = 0x01;/* power on */
161 buf[4] = 0x02;/* B port, H/V */
162 buf[5] = 0x00;/*13V v*/
163 break;
164 case SEC_VOLTAGE_18:
165 buf[3] = 0x01;
166 buf[4] = 0x02;
167 buf[5] = 0x01;/* 18V h*/
168 break;
169 case SEC_VOLTAGE_OFF:
170 buf[3] = 0x00;/* power off */
171 buf[4] = 0x00;
172 buf[5] = 0x00;
173 break;
174 }
175
176 return f300_xfer(fe, buf);
177 }
178