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 https://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 38 struct isl6421 { 39 u8 config; 40 u8 override_or; 41 u8 override_and; 42 struct i2c_adapter *i2c; 43 u8 i2c_addr; 44 }; 45 46 static int isl6421_set_voltage(struct dvb_frontend *fe, 47 enum fe_sec_voltage voltage) 48 { 49 struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv; 50 struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0, 51 .buf = &isl6421->config, 52 .len = sizeof(isl6421->config) }; 53 54 isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1); 55 56 switch(voltage) { 57 case SEC_VOLTAGE_OFF: 58 break; 59 case SEC_VOLTAGE_13: 60 isl6421->config |= ISL6421_EN1; 61 break; 62 case SEC_VOLTAGE_18: 63 isl6421->config |= (ISL6421_EN1 | ISL6421_VSEL1); 64 break; 65 default: 66 return -EINVAL; 67 } 68 69 isl6421->config |= isl6421->override_or; 70 isl6421->config &= isl6421->override_and; 71 72 return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO; 73 } 74 75 static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg) 76 { 77 struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv; 78 struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0, 79 .buf = &isl6421->config, 80 .len = sizeof(isl6421->config) }; 81 82 if (arg) 83 isl6421->config |= ISL6421_LLC1; 84 else 85 isl6421->config &= ~ISL6421_LLC1; 86 87 isl6421->config |= isl6421->override_or; 88 isl6421->config &= isl6421->override_and; 89 90 return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO; 91 } 92 93 static int isl6421_set_tone(struct dvb_frontend *fe, 94 enum fe_sec_tone_mode tone) 95 { 96 struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv; 97 struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0, 98 .buf = &isl6421->config, 99 .len = sizeof(isl6421->config) }; 100 101 switch (tone) { 102 case SEC_TONE_ON: 103 isl6421->config |= ISL6421_ENT1; 104 break; 105 case SEC_TONE_OFF: 106 isl6421->config &= ~ISL6421_ENT1; 107 break; 108 default: 109 return -EINVAL; 110 } 111 112 isl6421->config |= isl6421->override_or; 113 isl6421->config &= isl6421->override_and; 114 115 return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO; 116 } 117 118 static void isl6421_release(struct dvb_frontend *fe) 119 { 120 /* power off */ 121 isl6421_set_voltage(fe, SEC_VOLTAGE_OFF); 122 123 /* free */ 124 kfree(fe->sec_priv); 125 fe->sec_priv = NULL; 126 } 127 128 struct dvb_frontend *isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr, 129 u8 override_set, u8 override_clear, bool override_tone) 130 { 131 struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL); 132 if (!isl6421) 133 return NULL; 134 135 /* default configuration */ 136 isl6421->config = ISL6421_ISEL1; 137 isl6421->i2c = i2c; 138 isl6421->i2c_addr = i2c_addr; 139 fe->sec_priv = isl6421; 140 141 /* bits which should be forced to '1' */ 142 isl6421->override_or = override_set; 143 144 /* bits which should be forced to '0' */ 145 isl6421->override_and = ~override_clear; 146 147 /* detect if it is present or not */ 148 if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) { 149 kfree(isl6421); 150 fe->sec_priv = NULL; 151 return NULL; 152 } 153 154 /* install release callback */ 155 fe->ops.release_sec = isl6421_release; 156 157 /* override frontend ops */ 158 fe->ops.set_voltage = isl6421_set_voltage; 159 fe->ops.enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage; 160 if (override_tone) 161 fe->ops.set_tone = isl6421_set_tone; 162 163 return fe; 164 } 165 EXPORT_SYMBOL(isl6421_attach); 166 167 MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421"); 168 MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss"); 169 MODULE_LICENSE("GPL"); 170