2 * isl6421.h - driver for lnb supply and control ic ISL6421
4 * Copyright (C) 2006 Andrew de Quincey
5 * Copyright (C) 2006 Oliver Endriss
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
25 * the project's page is at http://www.linuxtv.org
27 #include <linux/delay.h>
28 #include <linux/errno.h>
29 #include <linux/init.h>
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/moduleparam.h>
33 #include <linux/string.h>
34 #include <linux/slab.h>
36 #include "dvb_frontend.h"
43 struct i2c_adapter *i2c;
45 void (*release_chain)(struct dvb_frontend* fe);
48 static int isl6421_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
50 struct isl6421 *isl6421 = (struct isl6421 *) fe->misc_priv;
51 struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
52 .buf = &isl6421->config,
53 .len = sizeof(isl6421->config) };
55 isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1);
61 isl6421->config |= ISL6421_EN1;
64 isl6421->config |= (ISL6421_EN1 | ISL6421_VSEL1);
70 isl6421->config |= isl6421->override_or;
71 isl6421->config &= isl6421->override_and;
73 return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
76 static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
78 struct isl6421 *isl6421 = (struct isl6421 *) fe->misc_priv;
79 struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
80 .buf = &isl6421->config,
81 .len = sizeof(isl6421->config) };
84 isl6421->config |= ISL6421_LLC1;
86 isl6421->config &= ~ISL6421_LLC1;
88 isl6421->config |= isl6421->override_or;
89 isl6421->config &= isl6421->override_and;
91 return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
94 static void isl6421_release(struct dvb_frontend *fe)
96 struct isl6421 *isl6421 = (struct isl6421 *) fe->misc_priv;
99 isl6421_set_voltage(fe, SEC_VOLTAGE_OFF);
101 /* free data & call next release routine */
102 fe->ops.release = isl6421->release_chain;
103 kfree(fe->misc_priv);
104 fe->misc_priv = NULL;
109 int isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr,
110 u8 override_set, u8 override_clear)
112 struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL);
116 /* default configuration */
117 isl6421->config = ISL6421_ISEL1;
119 isl6421->i2c_addr = i2c_addr;
120 fe->misc_priv = isl6421;
122 /* bits which should be forced to '1' */
123 isl6421->override_or = override_set;
125 /* bits which should be forced to '0' */
126 isl6421->override_and = ~override_clear;
128 /* detect if it is present or not */
129 if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) {
131 fe->misc_priv = NULL;
135 /* install release callback */
136 isl6421->release_chain = fe->ops.release;
137 fe->ops.release = isl6421_release;
139 /* override frontend ops */
140 fe->ops.set_voltage = isl6421_set_voltage;
141 fe->ops.enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage;
145 EXPORT_SYMBOL(isl6421_attach);
147 MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421");
148 MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss");
149 MODULE_LICENSE("GPL");