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 * To obtain the license, point your browser to 19 * http://www.gnu.org/copyleft/gpl.html 20 * 21 * 22 * the project's page is at https://linuxtv.org 23 */ 24 #include <linux/delay.h> 25 #include <linux/errno.h> 26 #include <linux/init.h> 27 #include <linux/kernel.h> 28 #include <linux/module.h> 29 #include <linux/moduleparam.h> 30 #include <linux/string.h> 31 #include <linux/slab.h> 32 33 #include <media/dvb_frontend.h> 34 #include "lnbp22.h" 35 36 static int debug; 37 module_param(debug, int, 0644); 38 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off)."); 39 40 41 #define dprintk(lvl, arg...) if (debug >= (lvl)) printk(arg) 42 43 struct lnbp22 { 44 u8 config[4]; 45 struct i2c_adapter *i2c; 46 }; 47 48 static int lnbp22_set_voltage(struct dvb_frontend *fe, 49 enum fe_sec_voltage voltage) 50 { 51 struct lnbp22 *lnbp22 = (struct lnbp22 *)fe->sec_priv; 52 struct i2c_msg msg = { 53 .addr = 0x08, 54 .flags = 0, 55 .buf = (char *)&lnbp22->config, 56 .len = sizeof(lnbp22->config), 57 }; 58 59 dprintk(1, "%s: %d (18V=%d 13V=%d)\n", __func__, voltage, 60 SEC_VOLTAGE_18, SEC_VOLTAGE_13); 61 62 lnbp22->config[3] = 0x60; /* Power down */ 63 switch (voltage) { 64 case SEC_VOLTAGE_OFF: 65 break; 66 case SEC_VOLTAGE_13: 67 lnbp22->config[3] |= LNBP22_EN; 68 break; 69 case SEC_VOLTAGE_18: 70 lnbp22->config[3] |= (LNBP22_EN | LNBP22_VSEL); 71 break; 72 default: 73 return -EINVAL; 74 } 75 76 dprintk(1, "%s: 0x%02x)\n", __func__, lnbp22->config[3]); 77 return (i2c_transfer(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO; 78 } 79 80 static int lnbp22_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg) 81 { 82 struct lnbp22 *lnbp22 = (struct lnbp22 *) fe->sec_priv; 83 struct i2c_msg msg = { 84 .addr = 0x08, 85 .flags = 0, 86 .buf = (char *)&lnbp22->config, 87 .len = sizeof(lnbp22->config), 88 }; 89 90 dprintk(1, "%s: %d\n", __func__, (int)arg); 91 if (arg) 92 lnbp22->config[3] |= LNBP22_LLC; 93 else 94 lnbp22->config[3] &= ~LNBP22_LLC; 95 96 return (i2c_transfer(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO; 97 } 98 99 static void lnbp22_release(struct dvb_frontend *fe) 100 { 101 dprintk(1, "%s\n", __func__); 102 /* LNBP power off */ 103 lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF); 104 105 /* free data */ 106 kfree(fe->sec_priv); 107 fe->sec_priv = NULL; 108 } 109 110 struct dvb_frontend *lnbp22_attach(struct dvb_frontend *fe, 111 struct i2c_adapter *i2c) 112 { 113 struct lnbp22 *lnbp22 = kmalloc(sizeof(struct lnbp22), GFP_KERNEL); 114 if (!lnbp22) 115 return NULL; 116 117 /* default configuration */ 118 lnbp22->config[0] = 0x00; /* ? */ 119 lnbp22->config[1] = 0x28; /* ? */ 120 lnbp22->config[2] = 0x48; /* ? */ 121 lnbp22->config[3] = 0x60; /* Power down */ 122 lnbp22->i2c = i2c; 123 fe->sec_priv = lnbp22; 124 125 /* detect if it is present or not */ 126 if (lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF)) { 127 dprintk(0, "%s LNBP22 not found\n", __func__); 128 kfree(lnbp22); 129 fe->sec_priv = NULL; 130 return NULL; 131 } 132 133 /* install release callback */ 134 fe->ops.release_sec = lnbp22_release; 135 136 /* override frontend ops */ 137 fe->ops.set_voltage = lnbp22_set_voltage; 138 fe->ops.enable_high_lnb_voltage = lnbp22_enable_high_lnb_voltage; 139 140 return fe; 141 } 142 EXPORT_SYMBOL(lnbp22_attach); 143 144 MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp22"); 145 MODULE_AUTHOR("Dominik Kuhlen"); 146 MODULE_LICENSE("GPL"); 147