summaryrefslogtreecommitdiffstats
path: root/drivers/media/dvb-frontends/isl6421.c
blob: c77002fcc8e2212fb825afb22a022a98fa873378 (plain)
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
/*
 * isl6421.h - driver for lnb supply and control ic ISL6421
 *
 * Copyright (C) 2006 Andrew de Quincey
 * Copyright (C) 2006 Oliver Endriss
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
 *
 *
 * the project's page is at http://www.linuxtv.org
 */
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/slab.h>

#include "dvb_frontend.h"
#include "isl6421.h"

struct isl6421 {
	u8			config;
	u8			override_or;
	u8			override_and;
	struct i2c_adapter	*i2c;
	u8			i2c_addr;
};

static int isl6421_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
{
	struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
	struct i2c_msg msg = {	.addr = isl6421->i2c_addr, .flags = 0,
				.buf = &isl6421->config,
				.len = sizeof(isl6421->config) };

	isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1);

	switch(voltage) {
	case SEC_VOLTAGE_OFF:
		break;
	case SEC_VOLTAGE_13:
		isl6421->config |= ISL6421_EN1;
		break;
	case SEC_VOLTAGE_18:
		isl6421->config |= (ISL6421_EN1 | ISL6421_VSEL1);
		break;
	default:
		return -EINVAL;
	}

	isl6421->config |= isl6421->override_or;
	isl6421->config &= isl6421->override_and;

	return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
}

static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
{
	struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
	struct i2c_msg msg = {	.addr = isl6421->i2c_addr, .flags = 0,
				.buf = &isl6421->config,
				.len = sizeof(isl6421->config) };

	if (arg)
		isl6421->config |= ISL6421_LLC1;
	else
		isl6421->config &= ~ISL6421_LLC1;

	isl6421->config |= isl6421->override_or;
	isl6421->config &= isl6421->override_and;

	return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
}

static int isl6421_set_tone(struct dvb_frontend* fe, fe_sec_tone_mode_t tone)
{
	struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
	struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
			       .buf = &isl6421->config,
			       .len = sizeof(isl6421->config) };

	switch (tone) {
	case SEC_TONE_ON:
		isl6421->config |= ISL6421_ENT1;
		break;
	case SEC_TONE_OFF:
		isl6421->config &= ~ISL6421_ENT1;
		break;
	default:
		return -EINVAL;
	}

	isl6421->config |= isl6421->override_or;
	isl6421->config &= isl6421->override_and;

	return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
}

static void isl6421_release(struct dvb_frontend *fe)
{
	/* power off */
	isl6421_set_voltage(fe, SEC_VOLTAGE_OFF);

	/* free */
	kfree(fe->sec_priv);
	fe->sec_priv = NULL;
}

struct dvb_frontend *isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr,
		   u8 override_set, u8 override_clear, bool override_tone)
{
	struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL);
	if (!isl6421)
		return NULL;

	/* default configuration */
	isl6421->config = ISL6421_ISEL1;
	isl6421->i2c = i2c;
	isl6421->i2c_addr = i2c_addr;
	fe->sec_priv = isl6421;

	/* bits which should be forced to '1' */
	isl6421->override_or = override_set;

	/* bits which should be forced to '0' */
	isl6421->override_and = ~override_clear;

	/* detect if it is present or not */
	if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) {
		kfree(isl6421);
		fe->sec_priv = NULL;
		return NULL;
	}

	/* install release callback */
	fe->ops.release_sec = isl6421_release;

	/* override frontend ops */
	fe->ops.set_voltage = isl6421_set_voltage;
	fe->ops.enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage;
	if (override_tone)
		fe->ops.set_tone = isl6421_set_tone;

	return fe;
}
EXPORT_SYMBOL(isl6421_attach);

MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421");
MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss");
MODULE_LICENSE("GPL");