1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
/*
Driver for Philips tda8262/tda8263 DVBS Silicon tuners
(c) 2006 Andrew de Quincey
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/dvb/frontend.h>
#include <asm/types.h>
#include "tda826x.h"
static int debug;
#define dprintk(args...) \
do { \
if (debug) printk(KERN_DEBUG "tda826x: " args); \
} while (0)
struct tda826x_priv {
/* i2c details */
int i2c_address;
struct i2c_adapter *i2c;
u8 has_loopthrough:1;
u32 frequency;
};
static int tda826x_release(struct dvb_frontend *fe)
{
kfree(fe->tuner_priv);
fe->tuner_priv = NULL;
return 0;
}
static int tda826x_sleep(struct dvb_frontend *fe)
{
struct tda826x_priv *priv = fe->tuner_priv;
int ret;
u8 buf [] = { 0x00, 0x8d };
struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 2 };
dprintk("%s:\n", __func__);
if (!priv->has_loopthrough)
buf[1] = 0xad;
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) {
dprintk("%s: i2c error\n", __func__);
}
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
return (ret == 1) ? 0 : ret;
}
static int tda826x_set_params(struct dvb_frontend *fe, struct dvb_frontend_parameters *params)
{
struct tda826x_priv *priv = fe->tuner_priv;
int ret;
u32 div;
u32 ksyms;
u32 bandwidth;
u8 buf [11];
struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 11 };
dprintk("%s:\n", __func__);
div = (params->frequency + (1000-1)) / 1000;
/* BW = ((1 + RO) * SR/2 + 5) * 1.3 [SR in MSPS, BW in MHz] */
/* with R0 = 0.35 and some transformations: */
ksyms = params->u.qpsk.symbol_rate / 1000;
bandwidth = (878 * ksyms + 6500000) / 1000000 + 1;
if (bandwidth < 5)
bandwidth = 5;
else if (bandwidth > 36)
bandwidth = 36;
buf[0] = 0x00; // subaddress
buf[1] = 0x09; // powerdown RSSI + the magic value 1
if (!priv->has_loopthrough)
buf[1] |= 0x20; // power down loopthrough if not needed
buf[2] = (1<<5) | 0x0b; // 1Mhz + 0.45 VCO
buf[3] = div >> 7;
buf[4] = div << 1;
buf[5] = ((bandwidth - 5) << 3) | 7; /* baseband cut-off */
buf[6] = 0xfe; // baseband gain 9 db + no RF attenuation
buf[7] = 0x83; // charge pumps at high, tests off
buf[8] = 0x80; // recommended value 4 for AMPVCO + disable ports.
buf[9] = 0x1a; // normal caltime + recommended values for SELTH + SELVTL
buf[10] = 0xd4; // recommended value 13 for BBIAS + unknown bit set on
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) {
dprintk("%s: i2c error\n", __func__);
}
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
priv->frequency = div * 1000;
return (ret == 1) ? 0 : ret;
}
static int tda826x_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
struct tda826x_priv *priv = fe->tuner_priv;
*frequency = priv->frequency;
return 0;
}
static struct dvb_tuner_ops tda826x_tuner_ops = {
.info = {
.name = "Philips TDA826X",
.frequency_min = 950000,
.frequency_max = 2175000
},
.release = tda826x_release,
.sleep = tda826x_sleep,
.set_params = tda826x_set_params,
.get_frequency = tda826x_get_frequency,
};
struct dvb_frontend *tda826x_attach(struct dvb_frontend *fe, int addr, struct i2c_adapter *i2c, int has_loopthrough)
{
struct tda826x_priv *priv = NULL;
u8 b1 [] = { 0, 0 };
struct i2c_msg msg[2] = {
{ .addr = addr, .flags = 0, .buf = NULL, .len = 0 },
{ .addr = addr, .flags = I2C_M_RD, .buf = b1, .len = 2 }
};
int ret;
dprintk("%s:\n", __func__);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
ret = i2c_transfer (i2c, msg, 2);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
if (ret != 2)
return NULL;
if (!(b1[1] & 0x80))
return NULL;
priv = kzalloc(sizeof(struct tda826x_priv), GFP_KERNEL);
if (priv == NULL)
return NULL;
priv->i2c_address = addr;
priv->i2c = i2c;
priv->has_loopthrough = has_loopthrough;
memcpy(&fe->ops.tuner_ops, &tda826x_tuner_ops, sizeof(struct dvb_tuner_ops));
fe->tuner_priv = priv;
return fe;
}
EXPORT_SYMBOL(tda826x_attach);
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
MODULE_DESCRIPTION("DVB TDA826x driver");
MODULE_AUTHOR("Andrew de Quincey");
MODULE_LICENSE("GPL");
|
