1/* 2 * lnbp21.h - driver for lnb supply and control ic lnbp21 3 * 4 * Copyright (C) 2006 Oliver Endriss 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 2 9 * of the License, or (at your option) any later version. 10 * 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 21 * Or, point your browser to http://www.gnu.org/copyleft/gpl.html 22 * 23 * 24 * the project's page is at http://www.linuxtv.org 25 */ 26#include <linux/delay.h> 27#include <linux/errno.h> 28#include <linux/init.h> 29#include <linux/kernel.h> 30#include <linux/module.h> 31#include <linux/moduleparam.h> 32#include <linux/string.h> 33#include <linux/slab.h> 34 35#include "dvb_frontend.h" 36#include "lnbp21.h" 37 38struct lnbp21 { 39 u8 config; 40 u8 override_or; 41 u8 override_and; 42 struct i2c_adapter *i2c; 43}; 44 45static int lnbp21_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage) 46{ 47 struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv; 48 struct i2c_msg msg = { .addr = 0x08, .flags = 0, 49 .buf = &lnbp21->config, 50 .len = sizeof(lnbp21->config) }; 51 52 lnbp21->config &= ~(LNBP21_VSEL | LNBP21_EN); 53 54 switch(voltage) { 55 case SEC_VOLTAGE_OFF: 56 break; 57 case SEC_VOLTAGE_13: 58 lnbp21->config |= LNBP21_EN; 59 break; 60 case SEC_VOLTAGE_18: 61 lnbp21->config |= (LNBP21_EN | LNBP21_VSEL); 62 break; 63 default: 64 return -EINVAL; 65 }; 66 67 lnbp21->config |= lnbp21->override_or; 68 lnbp21->config &= lnbp21->override_and; 69 70 return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO; 71} 72 73static int lnbp21_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg) 74{ 75 struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv; 76 struct i2c_msg msg = { .addr = 0x08, .flags = 0, 77 .buf = &lnbp21->config, 78 .len = sizeof(lnbp21->config) }; 79 80 if (arg) 81 lnbp21->config |= LNBP21_LLC; 82 else 83 lnbp21->config &= ~LNBP21_LLC; 84 85 lnbp21->config |= lnbp21->override_or; 86 lnbp21->config &= lnbp21->override_and; 87 88 return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO; 89} 90 91static void lnbp21_release(struct dvb_frontend *fe) 92{ 93 /* LNBP power off */ 94 lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF); 95 96 /* free data */ 97 kfree(fe->sec_priv); 98 fe->sec_priv = NULL; 99} 100 101struct dvb_frontend *lnbp21_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 override_set, u8 override_clear) 102{ 103 struct lnbp21 *lnbp21 = kmalloc(sizeof(struct lnbp21), GFP_KERNEL); 104 if (!lnbp21) 105 return NULL; 106 107 /* default configuration */ 108 lnbp21->config = LNBP21_ISEL; 109 lnbp21->i2c = i2c; 110 fe->sec_priv = lnbp21; 111 112 /* bits which should be forced to '1' */ 113 lnbp21->override_or = override_set; 114 115 /* bits which should be forced to '0' */ 116 lnbp21->override_and = ~override_clear; 117 118 /* detect if it is present or not */ 119 if (lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF)) { 120 kfree(lnbp21); 121 return NULL; 122 } 123 124 /* install release callback */ 125 fe->ops.release_sec = lnbp21_release; 126 127 /* override frontend ops */ 128 fe->ops.set_voltage = lnbp21_set_voltage; 129 fe->ops.enable_high_lnb_voltage = lnbp21_enable_high_lnb_voltage; 130 131 return fe; 132} 133EXPORT_SYMBOL(lnbp21_attach); 134 135MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp21"); 136MODULE_AUTHOR("Oliver Endriss"); 137MODULE_LICENSE("GPL"); 138