blob: 74fbb5d58bed73a28d2c1f7356f0b732b78b67a5 [file] [log] [blame]
Antti Palosaari85bc9b52011-08-01 00:52:11 -03001/*
2 * Allegro A8293 SEC driver
3 *
4 * Copyright (C) 2011 Antti Palosaari <crope@iki.fi>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 */
20
21#include "dvb_frontend.h"
22#include "a8293.h"
23
Antti Palosaari85bc9b52011-08-01 00:52:11 -030024struct a8293_priv {
25 struct i2c_adapter *i2c;
26 const struct a8293_config *cfg;
27 u8 reg[2];
28};
29
30static int a8293_i2c(struct a8293_priv *priv, u8 *val, int len, bool rd)
31{
32 int ret;
33 struct i2c_msg msg[1] = {
34 {
35 .addr = priv->cfg->i2c_addr,
36 .len = len,
37 .buf = val,
38 }
39 };
40
41 if (rd)
42 msg[0].flags = I2C_M_RD;
43 else
44 msg[0].flags = 0;
45
46 ret = i2c_transfer(priv->i2c, msg, 1);
47 if (ret == 1) {
48 ret = 0;
49 } else {
Antti Palosaariacc4e822012-07-02 05:13:58 -030050 dev_warn(&priv->i2c->dev, "%s: i2c failed=%d rd=%d\n",
51 KBUILD_MODNAME, ret, rd);
Antti Palosaari85bc9b52011-08-01 00:52:11 -030052 ret = -EREMOTEIO;
53 }
54
55 return ret;
56}
57
58static int a8293_wr(struct a8293_priv *priv, u8 *val, int len)
59{
60 return a8293_i2c(priv, val, len, 0);
61}
62
63static int a8293_rd(struct a8293_priv *priv, u8 *val, int len)
64{
65 return a8293_i2c(priv, val, len, 1);
66}
67
68static int a8293_set_voltage(struct dvb_frontend *fe,
69 fe_sec_voltage_t fe_sec_voltage)
70{
71 struct a8293_priv *priv = fe->sec_priv;
72 int ret;
73
Antti Palosaariacc4e822012-07-02 05:13:58 -030074 dev_dbg(&priv->i2c->dev, "%s: fe_sec_voltage=%d\n", __func__,
75 fe_sec_voltage);
Antti Palosaari85bc9b52011-08-01 00:52:11 -030076
77 switch (fe_sec_voltage) {
78 case SEC_VOLTAGE_OFF:
79 /* ENB=0 */
80 priv->reg[0] = 0x10;
81 break;
82 case SEC_VOLTAGE_13:
83 /* VSEL0=1, VSEL1=0, VSEL2=0, VSEL3=0, ENB=1*/
84 priv->reg[0] = 0x31;
85 break;
86 case SEC_VOLTAGE_18:
87 /* VSEL0=0, VSEL1=0, VSEL2=0, VSEL3=1, ENB=1*/
88 priv->reg[0] = 0x38;
89 break;
90 default:
91 ret = -EINVAL;
92 goto err;
Peter Senna Tschudinc2c1b412012-09-28 05:37:22 -030093 }
Antti Palosaari85bc9b52011-08-01 00:52:11 -030094
95 ret = a8293_wr(priv, &priv->reg[0], 1);
96 if (ret)
97 goto err;
98
99 return ret;
100err:
Antti Palosaariacc4e822012-07-02 05:13:58 -0300101 dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
Antti Palosaari85bc9b52011-08-01 00:52:11 -0300102 return ret;
103}
104
105static void a8293_release_sec(struct dvb_frontend *fe)
106{
Antti Palosaari85bc9b52011-08-01 00:52:11 -0300107 a8293_set_voltage(fe, SEC_VOLTAGE_OFF);
108
109 kfree(fe->sec_priv);
110 fe->sec_priv = NULL;
111}
112
113struct dvb_frontend *a8293_attach(struct dvb_frontend *fe,
114 struct i2c_adapter *i2c, const struct a8293_config *cfg)
115{
116 int ret;
117 struct a8293_priv *priv = NULL;
118 u8 buf[2];
119
120 /* allocate memory for the internal priv */
121 priv = kzalloc(sizeof(struct a8293_priv), GFP_KERNEL);
122 if (priv == NULL) {
123 ret = -ENOMEM;
124 goto err;
125 }
126
127 /* setup the priv */
128 priv->i2c = i2c;
129 priv->cfg = cfg;
130 fe->sec_priv = priv;
131
132 /* check if the SEC is there */
133 ret = a8293_rd(priv, buf, 2);
134 if (ret)
135 goto err;
136
137 /* ENB=0 */
138 priv->reg[0] = 0x10;
Antti Palosaarif3e16df2012-07-02 04:45:53 -0300139 ret = a8293_wr(priv, &priv->reg[0], 1);
Antti Palosaari85bc9b52011-08-01 00:52:11 -0300140 if (ret)
141 goto err;
142
143 /* TMODE=0, TGATE=1 */
144 priv->reg[1] = 0x82;
145 ret = a8293_wr(priv, &priv->reg[1], 1);
146 if (ret)
147 goto err;
148
Antti Palosaari85bc9b52011-08-01 00:52:11 -0300149 fe->ops.release_sec = a8293_release_sec;
150
151 /* override frontend ops */
152 fe->ops.set_voltage = a8293_set_voltage;
153
Antti Palosaariacc4e822012-07-02 05:13:58 -0300154 dev_info(&priv->i2c->dev, "%s: Allegro A8293 SEC attached\n",
155 KBUILD_MODNAME);
156
Antti Palosaari85bc9b52011-08-01 00:52:11 -0300157 return fe;
158err:
Antti Palosaariacc4e822012-07-02 05:13:58 -0300159 dev_dbg(&i2c->dev, "%s: failed=%d\n", __func__, ret);
Antti Palosaari85bc9b52011-08-01 00:52:11 -0300160 kfree(priv);
161 return NULL;
162}
163EXPORT_SYMBOL(a8293_attach);
164
165MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
166MODULE_DESCRIPTION("Allegro A8293 SEC driver");
167MODULE_LICENSE("GPL");