drivers/media/dvb/frontends/lnbp21.h

   1 /*
   2  * lnbp21.h - driver for lnb supply and control ic lnbp21
   3  *
   4  * Copyright (C) 2006 Oliver Endriss
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  *
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  21  * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
  22  *
  23  *
  24  * the project's page is at http://www.linuxtv.org
  25  */
  26
  27 #ifndef _LNBP21_H
  28 #define _LNBP21_H
  29
  30 /* system register */
  31 #define LNBP21_OLF      0x01
  32 #define LNBP21_OTF      0x02
  33 #define LNBP21_EN       0x04
  34 #define LNBP21_VSEL     0x08
  35 #define LNBP21_LLC      0x10
  36 #define LNBP21_TEN      0x20
  37 #define LNBP21_ISEL     0x40
  38 #define LNBP21_PCL      0x80
  39
  40 struct lnbp21 {
  41         u8                      config;
  42         u8                      override_or;
  43         u8                      override_and;
  44         struct i2c_adapter      *i2c;
  45         void                    (*release_chain)(struct dvb_frontend* fe);
  46 };
  47
  48 static int lnbp21_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
  49 {
  50         struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->misc_priv;
  51         struct i2c_msg msg = {  .addr = 0x08, .flags = 0,
  52                                 .buf = &lnbp21->config,
  53                                 .len = sizeof(lnbp21->config) };
  54
  55         lnbp21->config &= ~(LNBP21_VSEL | LNBP21_EN);
  56
  57         switch(voltage) {
  58         case SEC_VOLTAGE_OFF:
  59                 break;
  60         case SEC_VOLTAGE_13:
  61                 lnbp21->config |= LNBP21_EN;
  62                 break;
  63         case SEC_VOLTAGE_18:
  64                 lnbp21->config |= (LNBP21_EN | LNBP21_VSEL);
  65                 break;
  66         default:
  67                 return -EINVAL;
  68         };
  69
  70         lnbp21->config |= lnbp21->override_or;
  71         lnbp21->config &= lnbp21->override_and;
  72
  73         return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
  74 }
  75
  76 static int lnbp21_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
  77 {
  78         struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->misc_priv;
  79         struct i2c_msg msg = {  .addr = 0x08, .flags = 0,
  80                                 .buf = &lnbp21->config,
  81                                 .len = sizeof(lnbp21->config) };
  82
  83         if (arg)
  84                 lnbp21->config |= LNBP21_LLC;
  85         else
  86                 lnbp21->config &= ~LNBP21_LLC;
  87
  88         lnbp21->config |= lnbp21->override_or;
  89         lnbp21->config &= lnbp21->override_and;
  90
  91         return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
  92 }
  93
  94 static void lnbp21_exit(struct dvb_frontend *fe)
  95 {
  96         struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->misc_priv;
  97
  98         /* LNBP power off */
  99         lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF);
 100
 101         /* free data & call next release routine */
 102         fe->ops->release = lnbp21->release_chain;
 103         kfree(fe->misc_priv);
 104         fe->misc_priv = NULL;
 105         if (fe->ops->release)
 106                 fe->ops->release(fe);
 107 }
 108
 109 static int lnbp21_init(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 override_set, u8 override_clear)
 110 {
 111         struct lnbp21 *lnbp21 = kmalloc(sizeof(struct lnbp21), GFP_KERNEL);
 112
 113         if (!lnbp21)
 114                 return -ENOMEM;
 115
 116         /* default configuration */
 117         lnbp21->config = LNBP21_ISEL;
 118
 119         /* bits which should be forced to '1' */
 120         lnbp21->override_or = override_set;
 121
 122         /* bits which should be forced to '0' */
 123         lnbp21->override_and = ~override_clear;
 124
 125         /* install release callback */
 126         lnbp21->release_chain = fe->ops->release;
 127         fe->ops->release = lnbp21_exit;
 128
 129         /* override frontend ops */
 130         fe->ops->set_voltage = lnbp21_set_voltage;
 131         fe->ops->enable_high_lnb_voltage = lnbp21_enable_high_lnb_voltage;
 132
 133         lnbp21->i2c = i2c;
 134         fe->misc_priv = lnbp21;
 135
 136         return lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF);
 137 }
 138
 139 #endif