drivers/media/dvb-frontends/isl6405.c

   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  * 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/string.h>
  30 #include <linux/slab.h>
  31
  32 #include <media/dvb_frontend.h>
  33 #include "isl6405.h"
  34
  35 struct isl6405 {
  36         u8                      config;
  37         u8                      override_or;
  38         u8                      override_and;
  39         struct i2c_adapter      *i2c;
  40         u8                      i2c_addr;
  41 };
  42
  43 static int isl6405_set_voltage(struct dvb_frontend *fe,
  44                                enum fe_sec_voltage voltage)
  45 {
  46         struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
  47         struct i2c_msg msg = {  .addr = isl6405->i2c_addr, .flags = 0,
  48                                 .buf = &isl6405->config,
  49                                 .len = sizeof(isl6405->config) };
  50
  51         if (isl6405->override_or & 0x80) {
  52                 isl6405->config &= ~(ISL6405_VSEL2 | ISL6405_EN2);
  53                 switch (voltage) {
  54                 case SEC_VOLTAGE_OFF:
  55                         break;
  56                 case SEC_VOLTAGE_13:
  57                         isl6405->config |= ISL6405_EN2;
  58                         break;
  59                 case SEC_VOLTAGE_18:
  60                         isl6405->config |= (ISL6405_EN2 | ISL6405_VSEL2);
  61                         break;
  62                 default:
  63                         return -EINVAL;
  64                 }
  65         } else {
  66                 isl6405->config &= ~(ISL6405_VSEL1 | ISL6405_EN1);
  67                 switch (voltage) {
  68                 case SEC_VOLTAGE_OFF:
  69                         break;
  70                 case SEC_VOLTAGE_13:
  71                         isl6405->config |= ISL6405_EN1;
  72                         break;
  73                 case SEC_VOLTAGE_18:
  74                         isl6405->config |= (ISL6405_EN1 | ISL6405_VSEL1);
  75                         break;
  76                 default:
  77                         return -EINVAL;
  78                 }
  79         }
  80         isl6405->config |= isl6405->override_or;
  81         isl6405->config &= isl6405->override_and;
  82
  83         return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
  84 }
  85
  86 static int isl6405_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
  87 {
  88         struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
  89         struct i2c_msg msg = {  .addr = isl6405->i2c_addr, .flags = 0,
  90                                 .buf = &isl6405->config,
  91                                 .len = sizeof(isl6405->config) };
  92
  93         if (isl6405->override_or & 0x80) {
  94                 if (arg)
  95                         isl6405->config |= ISL6405_LLC2;
  96                 else
  97                         isl6405->config &= ~ISL6405_LLC2;
  98         } else {
  99                 if (arg)
 100                         isl6405->config |= ISL6405_LLC1;
 101                 else
 102                         isl6405->config &= ~ISL6405_LLC1;
 103         }
 104         isl6405->config |= isl6405->override_or;
 105         isl6405->config &= isl6405->override_and;
 106
 107         return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
 108 }
 109
 110 static void isl6405_release(struct dvb_frontend *fe)
 111 {
 112         /* power off */
 113         isl6405_set_voltage(fe, SEC_VOLTAGE_OFF);
 114
 115         /* free */
 116         kfree(fe->sec_priv);
 117         fe->sec_priv = NULL;
 118 }
 119
 120 struct dvb_frontend *isl6405_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c,
 121                                     u8 i2c_addr, u8 override_set, u8 override_clear)
 122 {
 123         struct isl6405 *isl6405 = kmalloc(sizeof(struct isl6405), GFP_KERNEL);
 124         if (!isl6405)
 125                 return NULL;
 126
 127         /* default configuration */
 128         if (override_set & 0x80)
 129                 isl6405->config = ISL6405_ISEL2;
 130         else
 131                 isl6405->config = ISL6405_ISEL1;
 132         isl6405->i2c = i2c;
 133         isl6405->i2c_addr = i2c_addr;
 134         fe->sec_priv = isl6405;
 135
 136         /* bits which should be forced to '1' */
 137         isl6405->override_or = override_set;
 138
 139         /* bits which should be forced to '0' */
 140         isl6405->override_and = ~override_clear;
 141
 142         /* detect if it is present or not */
 143         if (isl6405_set_voltage(fe, SEC_VOLTAGE_OFF)) {
 144                 kfree(isl6405);
 145                 fe->sec_priv = NULL;
 146                 return NULL;
 147         }
 148
 149         /* install release callback */
 150         fe->ops.release_sec = isl6405_release;
 151
 152         /* override frontend ops */
 153         fe->ops.set_voltage = isl6405_set_voltage;
 154         fe->ops.enable_high_lnb_voltage = isl6405_enable_high_lnb_voltage;
 155
 156         return fe;
 157 }
 158 EXPORT_SYMBOL(isl6405_attach);
 159
 160 MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6405");
 161 MODULE_AUTHOR("Hartmut Hackmann & Oliver Endriss");
 162 MODULE_LICENSE("GPL");