2 * lnbp21.h - driver for lnb supply and control ic lnbp21
4 * Copyright (C) 2006 Oliver Endriss
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.
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.
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
24 * the project's page is at http://www.linuxtv.org
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>
35 #include "dvb_frontend.h"
42 struct i2c_adapter *i2c;
43 void (*release_chain)(struct dvb_frontend* fe);
46 static int lnbp21_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
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) };
53 lnbp21->config &= ~(LNBP21_VSEL | LNBP21_EN);
59 lnbp21->config |= LNBP21_EN;
62 lnbp21->config |= (LNBP21_EN | LNBP21_VSEL);
68 lnbp21->config |= lnbp21->override_or;
69 lnbp21->config &= lnbp21->override_and;
71 return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
74 static int lnbp21_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
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) };
82 lnbp21->config |= LNBP21_LLC;
84 lnbp21->config &= ~LNBP21_LLC;
86 lnbp21->config |= lnbp21->override_or;
87 lnbp21->config &= lnbp21->override_and;
89 return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
92 static void lnbp21_release(struct dvb_frontend *fe)
94 struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->misc_priv;
97 lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF);
99 /* free data & call next release routine */
100 fe->ops.release = lnbp21->release_chain;
101 kfree(fe->misc_priv);
102 fe->misc_priv = NULL;
107 int lnbp21_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 override_set, u8 override_clear)
109 struct lnbp21 *lnbp21 = kmalloc(sizeof(struct lnbp21), GFP_KERNEL);
113 /* default configuration */
114 lnbp21->config = LNBP21_ISEL;
116 fe->misc_priv = lnbp21;
118 /* bits which should be forced to '1' */
119 lnbp21->override_or = override_set;
121 /* bits which should be forced to '0' */
122 lnbp21->override_and = ~override_clear;
124 /* detect if it is present or not */
125 if (lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF)) {
127 fe->misc_priv = NULL;
131 /* install release callback */
132 lnbp21->release_chain = fe->ops.release;
133 fe->ops.release = lnbp21_release;
135 /* override frontend ops */
136 fe->ops.set_voltage = lnbp21_set_voltage;
137 fe->ops.enable_high_lnb_voltage = lnbp21_enable_high_lnb_voltage;
141 EXPORT_SYMBOL(lnbp21_attach);
143 MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp21");
144 MODULE_AUTHOR("Oliver Endriss");
145 MODULE_LICENSE("GPL");