1 /* 2 * isl6405.c - driver for dual lnb supply and control ic ISL6405 3 * 4 * Copyright (C) 2008 Hartmut Hackmann 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 "isl6405.h" 37 38 struct isl6405 { 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 isl6405_set_voltage(struct dvb_frontend *fe, 47 enum fe_sec_voltage voltage) 48 { 49 struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv; 50 struct i2c_msg msg = { .addr = isl6405->i2c_addr, .flags = 0, 51 .buf = &isl6405->config, 52 .len = sizeof(isl6405->config) }; 53 54 if (isl6405->override_or & 0x80) { 55 isl6405->config &= ~(ISL6405_VSEL2 | ISL6405_EN2); 56 switch (voltage) { 57 case SEC_VOLTAGE_OFF: 58 break; 59 case SEC_VOLTAGE_13: 60 isl6405->config |= ISL6405_EN2; 61 break; 62 case SEC_VOLTAGE_18: 63 isl6405->config |= (ISL6405_EN2 | ISL6405_VSEL2); 64 break; 65 default: 66 return -EINVAL; 67 } 68 } else { 69 isl6405->config &= ~(ISL6405_VSEL1 | ISL6405_EN1); 70 switch (voltage) { 71 case SEC_VOLTAGE_OFF: 72 break; 73 case SEC_VOLTAGE_13: 74 isl6405->config |= ISL6405_EN1; 75 break; 76 case SEC_VOLTAGE_18: 77 isl6405->config |= (ISL6405_EN1 | ISL6405_VSEL1); 78 break; 79 default: 80 return -EINVAL; 81 } 82 } 83 isl6405->config |= isl6405->override_or; 84 isl6405->config &= isl6405->override_and; 85 86 return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO; 87 } 88 89 static int isl6405_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg) 90 { 91 struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv; 92 struct i2c_msg msg = { .addr = isl6405->i2c_addr, .flags = 0, 93 .buf = &isl6405->config, 94 .len = sizeof(isl6405->config) }; 95 96 if (isl6405->override_or & 0x80) { 97 if (arg) 98 isl6405->config |= ISL6405_LLC2; 99 else 100 isl6405->config &= ~ISL6405_LLC2; 101 } else { 102 if (arg) 103 isl6405->config |= ISL6405_LLC1; 104 else 105 isl6405->config &= ~ISL6405_LLC1; 106 } 107 isl6405->config |= isl6405->override_or; 108 isl6405->config &= isl6405->override_and; 109 110 return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO; 111 } 112 113 static void isl6405_release(struct dvb_frontend *fe) 114 { 115 /* power off */ 116 isl6405_set_voltage(fe, SEC_VOLTAGE_OFF); 117 118 /* free */ 119 kfree(fe->sec_priv); 120 fe->sec_priv = NULL; 121 } 122 123 struct dvb_frontend *isl6405_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, 124 u8 i2c_addr, u8 override_set, u8 override_clear) 125 { 126 struct isl6405 *isl6405 = kmalloc(sizeof(struct isl6405), GFP_KERNEL); 127 if (!isl6405) 128 return NULL; 129 130 /* default configuration */ 131 if (override_set & 0x80) 132 isl6405->config = ISL6405_ISEL2; 133 else 134 isl6405->config = ISL6405_ISEL1; 135 isl6405->i2c = i2c; 136 isl6405->i2c_addr = i2c_addr; 137 fe->sec_priv = isl6405; 138 139 /* bits which should be forced to '1' */ 140 isl6405->override_or = override_set; 141 142 /* bits which should be forced to '0' */ 143 isl6405->override_and = ~override_clear; 144 145 /* detect if it is present or not */ 146 if (isl6405_set_voltage(fe, SEC_VOLTAGE_OFF)) { 147 kfree(isl6405); 148 fe->sec_priv = NULL; 149 return NULL; 150 } 151 152 /* install release callback */ 153 fe->ops.release_sec = isl6405_release; 154 155 /* override frontend ops */ 156 fe->ops.set_voltage = isl6405_set_voltage; 157 fe->ops.enable_high_lnb_voltage = isl6405_enable_high_lnb_voltage; 158 159 return fe; 160 } 161 EXPORT_SYMBOL(isl6405_attach); 162 163 MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6405"); 164 MODULE_AUTHOR("Hartmut Hackmann & Oliver Endriss"); 165 MODULE_LICENSE("GPL"); 166