summaryrefslogtreecommitdiffstats
path: root/drivers/media/dvb-frontends/a8293.c
blob: 74fbb5d58bed73a28d2c1f7356f0b732b78b67a5 (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
/*
 * 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 {
	struct i2c_adapter *i2c;
	const struct a8293_config *cfg;
	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->cfg->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,
	fe_sec_voltage_t 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;

	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->cfg = cfg;
	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);

MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
MODULE_DESCRIPTION("Allegro A8293 SEC driver");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud