Merge git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia-fixes-2.6
[pandora-kernel.git] / drivers / media / dvb / frontends / lnbp21.c
1 /*
2  * lnbp21.h - driver for lnb supply and control ic lnbp21
3  *
4  * Copyright (C) 2006 Oliver Endriss
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version 2
9  * of the License, or (at your option) any later version.
10  *
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21  * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
22  *
23  *
24  * the project's page is at http://www.linuxtv.org
25  */
26 #include <linux/delay.h>
27 #include <linux/errno.h>
28 #include <linux/init.h>
29 #include <linux/kernel.h>
30 #include <linux/module.h>
31 #include <linux/string.h>
32 #include <linux/slab.h>
33
34 #include "dvb_frontend.h"
35 #include "lnbp21.h"
36
37 struct lnbp21 {
38         u8                      config;
39         u8                      override_or;
40         u8                      override_and;
41         struct i2c_adapter      *i2c;
42 };
43
44 static int lnbp21_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
45 {
46         struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
47         struct i2c_msg msg = {  .addr = 0x08, .flags = 0,
48                                 .buf = &lnbp21->config,
49                                 .len = sizeof(lnbp21->config) };
50
51         lnbp21->config &= ~(LNBP21_VSEL | LNBP21_EN);
52
53         switch(voltage) {
54         case SEC_VOLTAGE_OFF:
55                 break;
56         case SEC_VOLTAGE_13:
57                 lnbp21->config |= LNBP21_EN;
58                 break;
59         case SEC_VOLTAGE_18:
60                 lnbp21->config |= (LNBP21_EN | LNBP21_VSEL);
61                 break;
62         default:
63                 return -EINVAL;
64         };
65
66         lnbp21->config |= lnbp21->override_or;
67         lnbp21->config &= lnbp21->override_and;
68
69         return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
70 }
71
72 static int lnbp21_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
73 {
74         struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
75         struct i2c_msg msg = {  .addr = 0x08, .flags = 0,
76                                 .buf = &lnbp21->config,
77                                 .len = sizeof(lnbp21->config) };
78
79         if (arg)
80                 lnbp21->config |= LNBP21_LLC;
81         else
82                 lnbp21->config &= ~LNBP21_LLC;
83
84         lnbp21->config |= lnbp21->override_or;
85         lnbp21->config &= lnbp21->override_and;
86
87         return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
88 }
89
90 static void lnbp21_release(struct dvb_frontend *fe)
91 {
92         /* LNBP power off */
93         lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF);
94
95         /* free data */
96         kfree(fe->sec_priv);
97         fe->sec_priv = NULL;
98 }
99
100 struct dvb_frontend *lnbp21_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 override_set, u8 override_clear)
101 {
102         struct lnbp21 *lnbp21 = kmalloc(sizeof(struct lnbp21), GFP_KERNEL);
103         if (!lnbp21)
104                 return NULL;
105
106         /* default configuration */
107         lnbp21->config = LNBP21_ISEL;
108         lnbp21->i2c = i2c;
109         fe->sec_priv = lnbp21;
110
111         /* bits which should be forced to '1' */
112         lnbp21->override_or = override_set;
113
114         /* bits which should be forced to '0' */
115         lnbp21->override_and = ~override_clear;
116
117         /* detect if it is present or not */
118         if (lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF)) {
119                 kfree(lnbp21);
120                 return NULL;
121         }
122
123         /* install release callback */
124         fe->ops.release_sec = lnbp21_release;
125
126         /* override frontend ops */
127         fe->ops.set_voltage = lnbp21_set_voltage;
128         fe->ops.enable_high_lnb_voltage = lnbp21_enable_high_lnb_voltage;
129
130         return fe;
131 }
132 EXPORT_SYMBOL(lnbp21_attach);
133
134 MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp21");
135 MODULE_AUTHOR("Oliver Endriss");
136 MODULE_LICENSE("GPL");