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
lnbp21_set_voltage(struct dvb_frontend * fe,fe_sec_voltage_t voltage)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
lnbp21_enable_high_lnb_voltage(struct dvb_frontend * fe,long arg)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
lnbp21_release(struct dvb_frontend * fe)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
lnbp21_attach(struct dvb_frontend * fe,struct i2c_adapter * i2c,u8 override_set,u8 override_clear)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");
137