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
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
|
/*
TDA665x tuner driver
Copyright (C) Manu Abraham (abraham.manu@gmail.com)
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/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include "dvb_frontend.h"
#include "tda665x.h"
struct tda665x_state {
struct dvb_frontend *fe;
struct i2c_adapter *i2c;
const struct tda665x_config *config;
u32 frequency;
u32 bandwidth;
};
static int tda665x_read(struct tda665x_state *state, u8 *buf)
{
const struct tda665x_config *config = state->config;
int err = 0;
struct i2c_msg msg = { .addr = config->addr, .flags = I2C_M_RD, .buf = buf, .len = 2 };
err = i2c_transfer(state->i2c, &msg, 1);
if (err != 1)
goto exit;
return err;
exit:
printk(KERN_ERR "%s: I/O Error err=<%d>\n", __func__, err);
return err;
}
static int tda665x_write(struct tda665x_state *state, u8 *buf, u8 length)
{
const struct tda665x_config *config = state->config;
int err = 0;
struct i2c_msg msg = { .addr = config->addr, .flags = 0, .buf = buf, .len = length };
err = i2c_transfer(state->i2c, &msg, 1);
if (err != 1)
goto exit;
return err;
exit:
printk(KERN_ERR "%s: I/O Error err=<%d>\n", __func__, err);
return err;
}
static int tda665x_get_state(struct dvb_frontend *fe,
enum tuner_param param,
struct tuner_state *tstate)
{
struct tda665x_state *state = fe->tuner_priv;
int err = 0;
switch (param) {
case DVBFE_TUNER_FREQUENCY:
tstate->frequency = state->frequency;
break;
case DVBFE_TUNER_BANDWIDTH:
break;
default:
printk(KERN_ERR "%s: Unknown parameter (param=%d)\n", __func__, param);
err = -EINVAL;
break;
}
return err;
}
static int tda665x_get_status(struct dvb_frontend *fe, u32 *status)
{
struct tda665x_state *state = fe->tuner_priv;
u8 result = 0;
int err = 0;
*status = 0;
err = tda665x_read(state, &result);
if (err < 0)
goto exit;
if ((result >> 6) & 0x01) {
printk(KERN_DEBUG "%s: Tuner Phase Locked\n", __func__);
*status = 1;
}
return err;
exit:
printk(KERN_ERR "%s: I/O Error\n", __func__);
return err;
}
static int tda665x_set_state(struct dvb_frontend *fe,
enum tuner_param param,
struct tuner_state *tstate)
{
struct tda665x_state *state = fe->tuner_priv;
const struct tda665x_config *config = state->config;
u32 frequency, status = 0;
u8 buf[4];
int err = 0;
if (param & DVBFE_TUNER_FREQUENCY) {
frequency = tstate->frequency;
if ((frequency < config->frequency_max) || (frequency > config->frequency_min)) {
printk(KERN_ERR "%s: Frequency beyond limits, frequency=%d\n", __func__, frequency);
return -EINVAL;
}
frequency += config->frequency_offst;
frequency *= config->ref_multiplier;
frequency += config->ref_divider >> 1;
frequency /= config->ref_divider;
buf[0] = (u8) ((frequency & 0x7f00) >> 8);
buf[1] = (u8) (frequency & 0x00ff) >> 0;
buf[2] = 0x80 | 0x40 | 0x02;
buf[3] = 0x00;
/* restore frequency */
frequency = tstate->frequency;
if (frequency < 153000000) {
/* VHF-L */
buf[3] |= 0x01; /* fc, Low Band, 47 - 153 MHz */
if (frequency < 68000000)
buf[3] |= 0x40; /* 83uA */
if (frequency < 1040000000)
buf[3] |= 0x60; /* 122uA */
if (frequency < 1250000000)
buf[3] |= 0x80; /* 163uA */
else
buf[3] |= 0xa0; /* 254uA */
} else if (frequency < 438000000) {
/* VHF-H */
buf[3] |= 0x02; /* fc, Mid Band, 153 - 438 MHz */
if (frequency < 230000000)
buf[3] |= 0x40;
if (frequency < 300000000)
buf[3] |= 0x60;
else
buf[3] |= 0x80;
} else {
/* UHF */
buf[3] |= 0x04; /* fc, High Band, 438 - 862 MHz */
if (frequency < 470000000)
buf[3] |= 0x60;
if (frequency < 526000000)
buf[3] |= 0x80;
else
buf[3] |= 0xa0;
}
/* Set params */
err = tda665x_write(state, buf, 5);
if (err < 0)
goto exit;
/* sleep for some time */
printk(KERN_DEBUG "%s: Waiting to Phase LOCK\n", __func__);
msleep(20);
/* check status */
err = tda665x_get_status(fe, &status);
if (err < 0)
goto exit;
if (status == 1) {
printk(KERN_DEBUG "%s: Tuner Phase locked: status=%d\n", __func__, status);
state->frequency = frequency; /* cache successful state */
} else {
printk(KERN_ERR "%s: No Phase lock: status=%d\n", __func__, status);
}
} else {
printk(KERN_ERR "%s: Unknown parameter (param=%d)\n", __func__, param);
return -EINVAL;
}
return 0;
exit:
printk(KERN_ERR "%s: I/O Error\n", __func__);
return err;
}
static int tda665x_release(struct dvb_frontend *fe)
{
struct tda665x_state *state = fe->tuner_priv;
fe->tuner_priv = NULL;
kfree(state);
return 0;
}
static struct dvb_tuner_ops tda665x_ops = {
.set_state = tda665x_set_state,
.get_state = tda665x_get_state,
.get_status = tda665x_get_status,
.release = tda665x_release
};
struct dvb_frontend *tda665x_attach(struct dvb_frontend *fe,
const struct tda665x_config *config,
struct i2c_adapter *i2c)
{
struct tda665x_state *state = NULL;
struct dvb_tuner_info *info;
state = kzalloc(sizeof(struct tda665x_state), GFP_KERNEL);
if (!state)
return NULL;
state->config = config;
state->i2c = i2c;
state->fe = fe;
fe->tuner_priv = state;
fe->ops.tuner_ops = tda665x_ops;
info = &fe->ops.tuner_ops.info;
memcpy(info->name, config->name, sizeof(config->name));
info->frequency_min = config->frequency_min;
info->frequency_max = config->frequency_max;
info->frequency_step = config->frequency_offst;
printk(KERN_DEBUG "%s: Attaching TDA665x (%s) tuner\n", __func__, info->name);
return fe;
}
EXPORT_SYMBOL(tda665x_attach);
MODULE_DESCRIPTION("TDA665x driver");
MODULE_AUTHOR("Manu Abraham");
MODULE_LICENSE("GPL");
|
