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