1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
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 F300 |
10 | * GPIO1 - reset - P0.2 F300 |
11 | * GPIO2 - clk - P0.1 F300 |
12 | * GPIO3 - busy - P0.0 F300 |
13 | * |
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_0 |
21 | #define F300_RESET GPIO_1 |
22 | #define F300_CLK GPIO_2 |
23 | #define F300_BUSY GPIO_3 |
24 | |
25 | static void f300_set_line(struct cx23885_dev *dev, u32 line, u8 lvl) |
26 | { |
27 | cx23885_gpio_enable(dev, mask: line, asoutput: 1); |
28 | if (lvl == 1) |
29 | cx23885_gpio_set(dev, mask: line); |
30 | else |
31 | cx23885_gpio_clear(dev, mask: line); |
32 | } |
33 | |
34 | static u8 f300_get_line(struct cx23885_dev *dev, u32 line) |
35 | { |
36 | cx23885_gpio_enable(dev, mask: line, asoutput: 0); |
37 | |
38 | return cx23885_gpio_get(dev, mask: line); |
39 | } |
40 | |
41 | static 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, lvl: 0); |
47 | udelay(30); |
48 | f300_set_line(dev, F300_DATA, lvl: (dta & 0x80) >> 7);/* msb first */ |
49 | udelay(30); |
50 | dta <<= 1; |
51 | f300_set_line(dev, F300_CLK, lvl: 1); |
52 | udelay(30); |
53 | } |
54 | } |
55 | |
56 | static 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, lvl: 0); |
62 | udelay(30); |
63 | dta <<= 1; |
64 | f300_set_line(dev, F300_CLK, lvl: 1); |
65 | udelay(30); |
66 | dta |= f300_get_line(dev, F300_DATA);/* msb first */ |
67 | |
68 | } |
69 | |
70 | return dta; |
71 | } |
72 | |
73 | static 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, lvl: 1); |
86 | f300_set_line(dev, F300_CLK, lvl: 1); |
87 | udelay(30); |
88 | f300_set_line(dev, F300_DATA, lvl: 1); |
89 | msleep(msecs: 1); |
90 | |
91 | /* question: */ |
92 | f300_set_line(dev, F300_RESET, lvl: 0);/* begin to send data */ |
93 | msleep(msecs: 1); |
94 | |
95 | f300_send_byte(dev, dta: 0xe0);/* the slave address is 0xe0, write */ |
96 | msleep(msecs: 1); |
97 | |
98 | temp = buf[0]; |
99 | temp += 2; |
100 | for (i = 0; i < temp; i++) |
101 | f300_send_byte(dev, dta: buf[i]); |
102 | |
103 | f300_set_line(dev, F300_RESET, lvl: 1);/* sent data over */ |
104 | f300_set_line(dev, F300_DATA, lvl: 1); |
105 | |
106 | /* answer: */ |
107 | temp = 0; |
108 | for (i = 0; ((i < 8) & (temp == 0)); i++) { |
109 | msleep(msecs: 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, lvl: 0);/*ready...*/ |
120 | msleep(msecs: 1); |
121 | f300_send_byte(dev, dta: 0xe1);/* 0xe1 is Read */ |
122 | msleep(msecs: 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, lvl: 1);/* received data over */ |
131 | f300_set_line(dev, F300_DATA, lvl: 1); |
132 | } |
133 | |
134 | return ret; |
135 | } |
136 | |
137 | int 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 | |