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
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* lnbh25.c
*
* Driver for LNB supply and control IC LNBH25
*
* Copyright (C) 2014 NetUP Inc.
* Copyright (C) 2014 Sergey Kozlov <serjk@netup.ru>
* Copyright (C) 2014 Abylay Ospan <aospan@netup.ru>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <media/dvb_frontend.h>
#include "lnbh25.h"
/**
* struct lnbh25_priv - LNBH25 driver private data
* @i2c: pointer to the I2C adapter structure
* @i2c_address: I2C address of LNBH25 SEC chip
* @config: Registers configuration:
* offset 0: 1st register address, always 0x02 (DATA1)
* offset 1: DATA1 register value
* offset 2: DATA2 register value
*/
struct lnbh25_priv {
struct i2c_adapter *i2c;
u8 i2c_address;
u8 config[3];
};
#define LNBH25_STATUS_OFL 0x1
#define LNBH25_STATUS_VMON 0x4
#define LNBH25_VSEL_13 0x03
#define LNBH25_VSEL_18 0x0a
static int lnbh25_read_vmon(struct lnbh25_priv *priv)
{
int i, ret;
u8 addr = 0x00;
u8 status[6];
struct i2c_msg msg[2] = {
{
.addr = priv->i2c_address,
.flags = 0,
.len = 1,
.buf = &addr
}, {
.addr = priv->i2c_address,
.flags = I2C_M_RD,
.len = sizeof(status),
.buf = status
}
};
for (i = 0; i < 2; i++) {
ret = i2c_transfer(priv->i2c, &msg[i], 1);
if (ret >= 0 && ret != 1)
ret = -EIO;
if (ret < 0) {
dev_dbg(&priv->i2c->dev,
"%s(): I2C transfer %d failed (%d)\n",
__func__, i, ret);
return ret;
}
}
dev_dbg(&priv->i2c->dev, "%s(): %*ph\n",
__func__, (int) sizeof(status), status);
if ((status[0] & (LNBH25_STATUS_OFL | LNBH25_STATUS_VMON)) != 0) {
dev_err(&priv->i2c->dev,
"%s(): voltage in failure state, status reg 0x%x\n",
__func__, status[0]);
return -EIO;
}
return 0;
}
static int lnbh25_set_voltage(struct dvb_frontend *fe,
enum fe_sec_voltage voltage)
{
int ret;
u8 data1_reg;
const char *vsel;
struct lnbh25_priv *priv = fe->sec_priv;
struct i2c_msg msg = {
.addr = priv->i2c_address,
.flags = 0,
.len = sizeof(priv->config),
.buf = priv->config
};
switch (voltage) {
case SEC_VOLTAGE_OFF:
data1_reg = 0x00;
vsel = "Off";
break;
case SEC_VOLTAGE_13:
data1_reg = LNBH25_VSEL_13;
vsel = "13V";
break;
case SEC_VOLTAGE_18:
data1_reg = LNBH25_VSEL_18;
vsel = "18V";
break;
default:
return -EINVAL;
}
priv->config[1] = data1_reg;
dev_dbg(&priv->i2c->dev,
"%s(): %s, I2C 0x%x write [ %02x %02x %02x ]\n",
__func__, vsel, priv->i2c_address,
priv->config[0], priv->config[1], priv->config[2]);
ret = i2c_transfer(priv->i2c, &msg, 1);
if (ret >= 0 && ret != 1)
ret = -EIO;
if (ret < 0) {
dev_err(&priv->i2c->dev, "%s(): I2C transfer error (%d)\n",
__func__, ret);
return ret;
}
if (voltage != SEC_VOLTAGE_OFF) {
msleep(120);
ret = lnbh25_read_vmon(priv);
} else {
msleep(20);
ret = 0;
}
return ret;
}
static void lnbh25_release(struct dvb_frontend *fe)
{
struct lnbh25_priv *priv = fe->sec_priv;
dev_dbg(&priv->i2c->dev, "%s()\n", __func__);
lnbh25_set_voltage(fe, SEC_VOLTAGE_OFF);
kfree(fe->sec_priv);
fe->sec_priv = NULL;
}
struct dvb_frontend *lnbh25_attach(struct dvb_frontend *fe,
struct lnbh25_config *cfg,
struct i2c_adapter *i2c)
{
struct lnbh25_priv *priv;
dev_dbg(&i2c->dev, "%s()\n", __func__);
priv = kzalloc(sizeof(struct lnbh25_priv), GFP_KERNEL);
if (!priv)
return NULL;
priv->i2c_address = (cfg->i2c_address >> 1);
priv->i2c = i2c;
priv->config[0] = 0x02;
priv->config[1] = 0x00;
priv->config[2] = cfg->data2_config;
fe->sec_priv = priv;
if (lnbh25_set_voltage(fe, SEC_VOLTAGE_OFF)) {
dev_err(&i2c->dev,
"%s(): no LNBH25 found at I2C addr 0x%02x\n",
__func__, priv->i2c_address);
kfree(priv);
fe->sec_priv = NULL;
return NULL;
}
fe->ops.release_sec = lnbh25_release;
fe->ops.set_voltage = lnbh25_set_voltage;
dev_info(&i2c->dev, "%s(): attached at I2C addr 0x%02x\n",
__func__, priv->i2c_address);
return fe;
}
EXPORT_SYMBOL(lnbh25_attach);
MODULE_DESCRIPTION("ST LNBH25 driver");
MODULE_AUTHOR("info@netup.ru");
MODULE_LICENSE("GPL");
|
