1/* 2 * isl6421.h - driver for lnb supply and control ic ISL6421 3 * 4 * Copyright (C) 2006 Andrew de Quincey 5 * Copyright (C) 2006 Oliver Endriss 6 * 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. 11 * 12 * 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. 17 * 18 * 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 23 * 24 * 25 * the project's page is at http://www.linuxtv.org 26 */ 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/string.h> 33#include <linux/slab.h> 34 35#include "dvb_frontend.h" 36#include "isl6421.h" 37 38struct isl6421 { 39 u8 config; 40 u8 override_or; 41 u8 override_and; 42 struct i2c_adapter *i2c; 43 u8 i2c_addr; 44}; 45 46static int isl6421_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage) 47{ 48 struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv; 49 struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0, 50 .buf = &isl6421->config, 51 .len = sizeof(isl6421->config) }; 52 53 isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1); 54 55 switch(voltage) { 56 case SEC_VOLTAGE_OFF: 57 break; 58 case SEC_VOLTAGE_13: 59 isl6421->config |= ISL6421_EN1; 60 break; 61 case SEC_VOLTAGE_18: 62 isl6421->config |= (ISL6421_EN1 | ISL6421_VSEL1); 63 break; 64 default: 65 return -EINVAL; 66 }; 67 68 isl6421->config |= isl6421->override_or; 69 isl6421->config &= isl6421->override_and; 70 71 return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO; 72} 73 74static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg) 75{ 76 struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv; 77 struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0, 78 .buf = &isl6421->config, 79 .len = sizeof(isl6421->config) }; 80 81 if (arg) 82 isl6421->config |= ISL6421_LLC1; 83 else 84 isl6421->config &= ~ISL6421_LLC1; 85 86 isl6421->config |= isl6421->override_or; 87 isl6421->config &= isl6421->override_and; 88 89 return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO; 90} 91 92static void isl6421_release(struct dvb_frontend *fe) 93{ 94 /* power off */ 95 isl6421_set_voltage(fe, SEC_VOLTAGE_OFF); 96 97 /* free */ 98 kfree(fe->sec_priv); 99 fe->sec_priv = NULL; 100} 101 102struct dvb_frontend *isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr, 103 u8 override_set, u8 override_clear) 104{ 105 struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL); 106 if (!isl6421) 107 return NULL; 108 109 /* default configuration */ 110 isl6421->config = ISL6421_ISEL1; 111 isl6421->i2c = i2c; 112 isl6421->i2c_addr = i2c_addr; 113 fe->sec_priv = isl6421; 114 115 /* bits which should be forced to '1' */ 116 isl6421->override_or = override_set; 117 118 /* bits which should be forced to '0' */ 119 isl6421->override_and = ~override_clear; 120 121 /* detect if it is present or not */ 122 if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) { 123 kfree(isl6421); 124 fe->sec_priv = NULL; 125 return NULL; 126 } 127 128 /* install release callback */ 129 fe->ops.release_sec = isl6421_release; 130 131 /* override frontend ops */ 132 fe->ops.set_voltage = isl6421_set_voltage; 133 fe->ops.enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage; 134 135 return fe; 136} 137EXPORT_SYMBOL(isl6421_attach); 138 139MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421"); 140MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss"); 141MODULE_LICENSE("GPL"); 142