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