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.
18 * To obtain the license, point your browser to
19 * http://www.gnu.org/copyleft/gpl.html
22 * the project's page is at https://linuxtv.org
24 #include <linux/delay.h>
25 #include <linux/errno.h>
26 #include <linux/init.h>
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/string.h>
30 #include <linux/slab.h>
32 #include "dvb_frontend.h"
39 struct i2c_adapter *i2c;
43 static int isl6421_set_voltage(struct dvb_frontend *fe,
44 enum fe_sec_voltage voltage)
46 struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
47 struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
48 .buf = &isl6421->config,
49 .len = sizeof(isl6421->config) };
51 isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1);
57 isl6421->config |= ISL6421_EN1;
60 isl6421->config |= (ISL6421_EN1 | ISL6421_VSEL1);
66 isl6421->config |= isl6421->override_or;
67 isl6421->config &= isl6421->override_and;
69 return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
72 static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
74 struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
75 struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
76 .buf = &isl6421->config,
77 .len = sizeof(isl6421->config) };
80 isl6421->config |= ISL6421_LLC1;
82 isl6421->config &= ~ISL6421_LLC1;
84 isl6421->config |= isl6421->override_or;
85 isl6421->config &= isl6421->override_and;
87 return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
90 static int isl6421_set_tone(struct dvb_frontend *fe,
91 enum fe_sec_tone_mode tone)
93 struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
94 struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
95 .buf = &isl6421->config,
96 .len = sizeof(isl6421->config) };
100 isl6421->config |= ISL6421_ENT1;
103 isl6421->config &= ~ISL6421_ENT1;
109 isl6421->config |= isl6421->override_or;
110 isl6421->config &= isl6421->override_and;
112 return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
115 static void isl6421_release(struct dvb_frontend *fe)
118 isl6421_set_voltage(fe, SEC_VOLTAGE_OFF);
125 struct dvb_frontend *isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr,
126 u8 override_set, u8 override_clear, bool override_tone)
128 struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL);
132 /* default configuration */
133 isl6421->config = ISL6421_ISEL1;
135 isl6421->i2c_addr = i2c_addr;
136 fe->sec_priv = isl6421;
138 /* bits which should be forced to '1' */
139 isl6421->override_or = override_set;
141 /* bits which should be forced to '0' */
142 isl6421->override_and = ~override_clear;
144 /* detect if it is present or not */
145 if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) {
151 /* install release callback */
152 fe->ops.release_sec = isl6421_release;
154 /* override frontend ops */
155 fe->ops.set_voltage = isl6421_set_voltage;
156 fe->ops.enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage;
158 fe->ops.set_tone = isl6421_set_tone;
162 EXPORT_SYMBOL(isl6421_attach);
164 MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421");
165 MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss");
166 MODULE_LICENSE("GPL");