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