Merge branch 'master' into upstream
[linux-2.6] / 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/moduleparam.h>
32 #include <linux/string.h>
33 #include <linux/slab.h>
34
35 #include "dvb_frontend.h"
36 #include "lnbp21.h"
37
38 struct lnbp21 {
39         u8                      config;
40         u8                      override_or;
41         u8                      override_and;
42         struct i2c_adapter      *i2c;
43 };
44
45 static int lnbp21_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
46 {
47         struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
48         struct i2c_msg msg = {  .addr = 0x08, .flags = 0,
49                                 .buf = &lnbp21->config,
50                                 .len = sizeof(lnbp21->config) };
51
52         lnbp21->config &= ~(LNBP21_VSEL | LNBP21_EN);
53
54         switch(voltage) {
55         case SEC_VOLTAGE_OFF:
56                 break;
57         case SEC_VOLTAGE_13:
58                 lnbp21->config |= LNBP21_EN;
59                 break;
60         case SEC_VOLTAGE_18:
61                 lnbp21->config |= (LNBP21_EN | LNBP21_VSEL);
62                 break;
63         default:
64                 return -EINVAL;
65         };
66
67         lnbp21->config |= lnbp21->override_or;
68         lnbp21->config &= lnbp21->override_and;
69
70         return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
71 }
72
73 static int lnbp21_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
74 {
75         struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
76         struct i2c_msg msg = {  .addr = 0x08, .flags = 0,
77                                 .buf = &lnbp21->config,
78                                 .len = sizeof(lnbp21->config) };
79
80         if (arg)
81                 lnbp21->config |= LNBP21_LLC;
82         else
83                 lnbp21->config &= ~LNBP21_LLC;
84
85         lnbp21->config |= lnbp21->override_or;
86         lnbp21->config &= lnbp21->override_and;
87
88         return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
89 }
90
91 static void lnbp21_release(struct dvb_frontend *fe)
92 {
93         /* LNBP power off */
94         lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF);
95
96         /* free data */
97         kfree(fe->sec_priv);
98         fe->sec_priv = NULL;
99 }
100
101 struct dvb_frontend *lnbp21_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 override_set, u8 override_clear)
102 {
103         struct lnbp21 *lnbp21 = kmalloc(sizeof(struct lnbp21), GFP_KERNEL);
104         if (!lnbp21)
105                 return NULL;
106
107         /* default configuration */
108         lnbp21->config = LNBP21_ISEL;
109         lnbp21->i2c = i2c;
110         fe->sec_priv = lnbp21;
111
112         /* bits which should be forced to '1' */
113         lnbp21->override_or = override_set;
114
115         /* bits which should be forced to '0' */
116         lnbp21->override_and = ~override_clear;
117
118         /* detect if it is present or not */
119         if (lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF)) {
120                 kfree(lnbp21);
121                 return NULL;
122         }
123
124         /* install release callback */
125         fe->ops.release_sec = lnbp21_release;
126
127         /* override frontend ops */
128         fe->ops.set_voltage = lnbp21_set_voltage;
129         fe->ops.enable_high_lnb_voltage = lnbp21_enable_high_lnb_voltage;
130
131         return fe;
132 }
133 EXPORT_SYMBOL(lnbp21_attach);
134
135 MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp21");
136 MODULE_AUTHOR("Oliver Endriss");
137 MODULE_LICENSE("GPL");