1 /* 2 * lnbp22.h - driver for lnb supply and control ic lnbp22 3 * 4 * Copyright (C) 2006 Dominik Kuhlen 5 * Based on lnbp21 driver 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/moduleparam.h> 33 #include <linux/string.h> 34 #include <linux/slab.h> 35 36 #include "dvb_frontend.h" 37 #include "lnbp22.h" 38 39 static int debug; 40 module_param(debug, int, 0644); 41 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off)."); 42 43 44 #define dprintk(lvl, arg...) if (debug >= (lvl)) printk(arg) 45 46 struct lnbp22 { 47 u8 config[4]; 48 struct i2c_adapter *i2c; 49 }; 50 51 static int lnbp22_set_voltage(struct dvb_frontend *fe, 52 enum fe_sec_voltage voltage) 53 { 54 struct lnbp22 *lnbp22 = (struct lnbp22 *)fe->sec_priv; 55 struct i2c_msg msg = { 56 .addr = 0x08, 57 .flags = 0, 58 .buf = (char *)&lnbp22->config, 59 .len = sizeof(lnbp22->config), 60 }; 61 62 dprintk(1, "%s: %d (18V=%d 13V=%d)\n", __func__, voltage, 63 SEC_VOLTAGE_18, SEC_VOLTAGE_13); 64 65 lnbp22->config[3] = 0x60; /* Power down */ 66 switch (voltage) { 67 case SEC_VOLTAGE_OFF: 68 break; 69 case SEC_VOLTAGE_13: 70 lnbp22->config[3] |= LNBP22_EN; 71 break; 72 case SEC_VOLTAGE_18: 73 lnbp22->config[3] |= (LNBP22_EN | LNBP22_VSEL); 74 break; 75 default: 76 return -EINVAL; 77 } 78 79 dprintk(1, "%s: 0x%02x)\n", __func__, lnbp22->config[3]); 80 return (i2c_transfer(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO; 81 } 82 83 static int lnbp22_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg) 84 { 85 struct lnbp22 *lnbp22 = (struct lnbp22 *) fe->sec_priv; 86 struct i2c_msg msg = { 87 .addr = 0x08, 88 .flags = 0, 89 .buf = (char *)&lnbp22->config, 90 .len = sizeof(lnbp22->config), 91 }; 92 93 dprintk(1, "%s: %d\n", __func__, (int)arg); 94 if (arg) 95 lnbp22->config[3] |= LNBP22_LLC; 96 else 97 lnbp22->config[3] &= ~LNBP22_LLC; 98 99 return (i2c_transfer(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO; 100 } 101 102 static void lnbp22_release(struct dvb_frontend *fe) 103 { 104 dprintk(1, "%s\n", __func__); 105 /* LNBP power off */ 106 lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF); 107 108 /* free data */ 109 kfree(fe->sec_priv); 110 fe->sec_priv = NULL; 111 } 112 113 struct dvb_frontend *lnbp22_attach(struct dvb_frontend *fe, 114 struct i2c_adapter *i2c) 115 { 116 struct lnbp22 *lnbp22 = kmalloc(sizeof(struct lnbp22), GFP_KERNEL); 117 if (!lnbp22) 118 return NULL; 119 120 /* default configuration */ 121 lnbp22->config[0] = 0x00; /* ? */ 122 lnbp22->config[1] = 0x28; /* ? */ 123 lnbp22->config[2] = 0x48; /* ? */ 124 lnbp22->config[3] = 0x60; /* Power down */ 125 lnbp22->i2c = i2c; 126 fe->sec_priv = lnbp22; 127 128 /* detect if it is present or not */ 129 if (lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF)) { 130 dprintk(0, "%s LNBP22 not found\n", __func__); 131 kfree(lnbp22); 132 fe->sec_priv = NULL; 133 return NULL; 134 } 135 136 /* install release callback */ 137 fe->ops.release_sec = lnbp22_release; 138 139 /* override frontend ops */ 140 fe->ops.set_voltage = lnbp22_set_voltage; 141 fe->ops.enable_high_lnb_voltage = lnbp22_enable_high_lnb_voltage; 142 143 return fe; 144 } 145 EXPORT_SYMBOL(lnbp22_attach); 146 147 MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp22"); 148 MODULE_AUTHOR("Dominik Kuhlen"); 149 MODULE_LICENSE("GPL"); 150