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
|
/*
* Allegro A8293 SEC driver
*
* Copyright (C) 2011 Antti Palosaari <crope@iki.fi>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "dvb_frontend.h"
#include "a8293.h"
struct a8293_priv {
u8 i2c_addr;
struct i2c_adapter *i2c;
struct i2c_client *client;
u8 reg[2];
};
static int a8293_i2c(struct a8293_priv *priv, u8 *val, int len, bool rd)
{
int ret;
struct i2c_msg msg[1] = {
{
.addr = priv->i2c_addr,
.len = len,
.buf = val,
}
};
if (rd)
msg[0].flags = I2C_M_RD;
else
msg[0].flags = 0;
ret = i2c_transfer(priv->i2c, msg, 1);
if (ret == 1) {
ret = 0;
} else {
dev_warn(&priv->i2c->dev, "%s: i2c failed=%d rd=%d\n",
KBUILD_MODNAME, ret, rd);
ret = -EREMOTEIO;
}
return ret;
}
static int a8293_wr(struct a8293_priv *priv, u8 *val, int len)
{
return a8293_i2c(priv, val, len, 0);
}
static int a8293_rd(struct a8293_priv *priv, u8 *val, int len)
{
return a8293_i2c(priv, val, len, 1);
}
static int a8293_set_voltage(struct dvb_frontend *fe,
enum fe_sec_voltage fe_sec_voltage)
{
struct a8293_priv *priv = fe->sec_priv;
int ret;
dev_dbg(&priv->i2c->dev, "%s: fe_sec_voltage=%d\n", __func__,
fe_sec_voltage);
switch (fe_sec_voltage) {
case SEC_VOLTAGE_OFF:
/* ENB=0 */
priv->reg[0] = 0x10;
break;
case SEC_VOLTAGE_13:
/* VSEL0=1, VSEL1=0, VSEL2=0, VSEL3=0, ENB=1*/
priv->reg[0] = 0x31;
break;
case SEC_VOLTAGE_18:
/* VSEL0=0, VSEL1=0, VSEL2=0, VSEL3=1, ENB=1*/
priv->reg[0] = 0x38;
break;
default:
ret = -EINVAL;
goto err;
}
ret = a8293_wr(priv, &priv->reg[0], 1);
if (ret)
goto err;
usleep_range(1500, 50000);
return ret;
err:
dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
return ret;
}
static void a8293_release_sec(struct dvb_frontend *fe)
{
a8293_set_voltage(fe, SEC_VOLTAGE_OFF);
kfree(fe->sec_priv);
fe->sec_priv = NULL;
}
struct dvb_frontend *a8293_attach(struct dvb_frontend *fe,
struct i2c_adapter *i2c, const struct a8293_config *cfg)
{
int ret;
struct a8293_priv *priv = NULL;
u8 buf[2];
/* allocate memory for the internal priv */
priv = kzalloc(sizeof(struct a8293_priv), GFP_KERNEL);
if (priv == NULL) {
ret = -ENOMEM;
goto err;
}
/* setup the priv */
priv->i2c = i2c;
priv->i2c_addr = cfg->i2c_addr;
fe->sec_priv = priv;
/* check if the SEC is there */
ret = a8293_rd(priv, buf, 2);
if (ret)
goto err;
/* ENB=0 */
priv->reg[0] = 0x10;
ret = a8293_wr(priv, &priv->reg[0], 1);
if (ret)
goto err;
/* TMODE=0, TGATE=1 */
priv->reg[1] = 0x82;
ret = a8293_wr(priv, &priv->reg[1], 1);
if (ret)
goto err;
fe->ops.release_sec = a8293_release_sec;
/* override frontend ops */
fe->ops.set_voltage = a8293_set_voltage;
dev_info(&priv->i2c->dev, "%s: Allegro A8293 SEC attached\n",
KBUILD_MODNAME);
return fe;
err:
dev_dbg(&i2c->dev, "%s: failed=%d\n", __func__, ret);
kfree(priv);
return NULL;
}
EXPORT_SYMBOL(a8293_attach);
static int a8293_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct a8293_priv *dev;
struct a8293_platform_data *pdata = client->dev.platform_data;
struct dvb_frontend *fe = pdata->dvb_frontend;
int ret;
u8 buf[2];
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev) {
ret = -ENOMEM;
goto err;
}
dev->client = client;
dev->i2c = client->adapter;
dev->i2c_addr = client->addr;
/* check if the SEC is there */
ret = a8293_rd(dev, buf, 2);
if (ret)
goto err_kfree;
/* ENB=0 */
dev->reg[0] = 0x10;
ret = a8293_wr(dev, &dev->reg[0], 1);
if (ret)
goto err_kfree;
/* TMODE=0, TGATE=1 */
dev->reg[1] = 0x82;
ret = a8293_wr(dev, &dev->reg[1], 1);
if (ret)
goto err_kfree;
/* override frontend ops */
fe->ops.set_voltage = a8293_set_voltage;
fe->sec_priv = dev;
i2c_set_clientdata(client, dev);
dev_info(&client->dev, "Allegro A8293 SEC successfully attached\n");
return 0;
err_kfree:
kfree(dev);
err:
dev_dbg(&client->dev, "failed=%d\n", ret);
return ret;
}
static int a8293_remove(struct i2c_client *client)
{
struct a8293_dev *dev = i2c_get_clientdata(client);
dev_dbg(&client->dev, "\n");
kfree(dev);
return 0;
}
static const struct i2c_device_id a8293_id_table[] = {
{"a8293", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, a8293_id_table);
static struct i2c_driver a8293_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "a8293",
.suppress_bind_attrs = true,
},
.probe = a8293_probe,
.remove = a8293_remove,
.id_table = a8293_id_table,
};
module_i2c_driver(a8293_driver);
MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
MODULE_DESCRIPTION("Allegro A8293 SEC driver");
MODULE_LICENSE("GPL");
|
