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09ea33e5 IL |
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | } |