Merge master.kernel.org:/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog
[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         void                    (*release_chain)(struct dvb_frontend* fe);
44 };
45
46 static int lnbp21_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
47 {
48         struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->misc_priv;
49         struct i2c_msg msg = {  .addr = 0x08, .flags = 0,
50                                 .buf = &lnbp21->config,
51                                 .len = sizeof(lnbp21->config) };
52
53         lnbp21->config &= ~(LNBP21_VSEL | LNBP21_EN);
54
55         switch(voltage) {
56         case SEC_VOLTAGE_OFF:
57                 break;
58         case SEC_VOLTAGE_13:
59                 lnbp21->config |= LNBP21_EN;
60                 break;
61         case SEC_VOLTAGE_18:
62                 lnbp21->config |= (LNBP21_EN | LNBP21_VSEL);
63                 break;
64         default:
65                 return -EINVAL;
66         };
67
68         lnbp21->config |= lnbp21->override_or;
69         lnbp21->config &= lnbp21->override_and;
70
71         return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
72 }
73
74 static int lnbp21_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
75 {
76         struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->misc_priv;
77         struct i2c_msg msg = {  .addr = 0x08, .flags = 0,
78                                 .buf = &lnbp21->config,
79                                 .len = sizeof(lnbp21->config) };
80
81         if (arg)
82                 lnbp21->config |= LNBP21_LLC;
83         else
84                 lnbp21->config &= ~LNBP21_LLC;
85
86         lnbp21->config |= lnbp21->override_or;
87         lnbp21->config &= lnbp21->override_and;
88
89         return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
90 }
91
92 static void lnbp21_release(struct dvb_frontend *fe)
93 {
94         struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->misc_priv;
95
96         /* LNBP power off */
97         lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF);
98
99         /* free data & call next release routine */
100         fe->ops.release = lnbp21->release_chain;
101         kfree(fe->misc_priv);
102         fe->misc_priv = NULL;
103         if (fe->ops.release)
104                 fe->ops.release(fe);
105 }
106
107 int lnbp21_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 override_set, u8 override_clear)
108 {
109         struct lnbp21 *lnbp21 = kmalloc(sizeof(struct lnbp21), GFP_KERNEL);
110         if (!lnbp21)
111                 return -ENOMEM;
112
113         /* default configuration */
114         lnbp21->config = LNBP21_ISEL;
115         lnbp21->i2c = i2c;
116         fe->misc_priv = lnbp21;
117
118         /* bits which should be forced to '1' */
119         lnbp21->override_or = override_set;
120
121         /* bits which should be forced to '0' */
122         lnbp21->override_and = ~override_clear;
123
124         /* detect if it is present or not */
125         if (lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF)) {
126                 kfree(lnbp21);
127                 fe->misc_priv = NULL;
128                 return -EIO;
129         }
130
131         /* install release callback */
132         lnbp21->release_chain = fe->ops.release;
133         fe->ops.release = lnbp21_release;
134
135         /* override frontend ops */
136         fe->ops.set_voltage = lnbp21_set_voltage;
137         fe->ops.enable_high_lnb_voltage = lnbp21_enable_high_lnb_voltage;
138
139         return 0;
140 }
141 EXPORT_SYMBOL(lnbp21_attach);
142
143 MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp21");
144 MODULE_AUTHOR("Oliver Endriss");
145 MODULE_LICENSE("GPL");