drivers/media/dvb/frontends/lnbp21.c

   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 #include <linux/delay.h>
  27 #include <linux/errno.h>
  28 #include <linux/init.h>
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/string.h>
  32 #include <linux/slab.h>
  33
  34 #include "dvb_frontend.h"
  35 #include "lnbp21.h"
  36
  37 struct lnbp21 {
  38         u8                      config;
  39         u8                      override_or;
  40         u8                      override_and;
  41         struct i2c_adapter      *i2c;
  42 };
  43
  44 static int lnbp21_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
  45 {
  46         struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
  47         struct i2c_msg msg = {  .addr = 0x08, .flags = 0,
  48                                 .buf = &lnbp21->config,
  49                                 .len = sizeof(lnbp21->config) };
  50
  51         lnbp21->config &= ~(LNBP21_VSEL | LNBP21_EN);
  52
  53         switch(voltage) {
  54         case SEC_VOLTAGE_OFF:
  55                 break;
  56         case SEC_VOLTAGE_13:
  57                 lnbp21->config |= LNBP21_EN;
  58                 break;
  59         case SEC_VOLTAGE_18:
  60                 lnbp21->config |= (LNBP21_EN | LNBP21_VSEL);
  61                 break;
  62         default:
  63                 return -EINVAL;
  64         };
  65
  66         lnbp21->config |= lnbp21->override_or;
  67         lnbp21->config &= lnbp21->override_and;
  68
  69         return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
  70 }
  71
  72 static int lnbp21_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
  73 {
  74         struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
  75         struct i2c_msg msg = {  .addr = 0x08, .flags = 0,
  76                                 .buf = &lnbp21->config,
  77                                 .len = sizeof(lnbp21->config) };
  78
  79         if (arg)
  80                 lnbp21->config |= LNBP21_LLC;
  81         else
  82                 lnbp21->config &= ~LNBP21_LLC;
  83
  84         lnbp21->config |= lnbp21->override_or;
  85         lnbp21->config &= lnbp21->override_and;
  86
  87         return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
  88 }
  89
  90 static void lnbp21_release(struct dvb_frontend *fe)
  91 {
  92         /* LNBP power off */
  93         lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF);
  94
  95         /* free data */
  96         kfree(fe->sec_priv);
  97         fe->sec_priv = NULL;
  98 }
  99
 100 struct dvb_frontend *lnbp21_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 override_set, u8 override_clear)
 101 {
 102         struct lnbp21 *lnbp21 = kmalloc(sizeof(struct lnbp21), GFP_KERNEL);
 103         if (!lnbp21)
 104                 return NULL;
 105
 106         /* default configuration */
 107         lnbp21->config = LNBP21_ISEL;
 108         lnbp21->i2c = i2c;
 109         fe->sec_priv = lnbp21;
 110
 111         /* bits which should be forced to '1' */
 112         lnbp21->override_or = override_set;
 113
 114         /* bits which should be forced to '0' */
 115         lnbp21->override_and = ~override_clear;
 116
 117         /* detect if it is present or not */
 118         if (lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF)) {
 119                 kfree(lnbp21);
 120                 return NULL;
 121         }
 122
 123         /* install release callback */
 124         fe->ops.release_sec = lnbp21_release;
 125
 126         /* override frontend ops */
 127         fe->ops.set_voltage = lnbp21_set_voltage;
 128         fe->ops.enable_high_lnb_voltage = lnbp21_enable_high_lnb_voltage;
 129
 130         return fe;
 131 }
 132 EXPORT_SYMBOL(lnbp21_attach);
 133
 134 MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp21");
 135 MODULE_AUTHOR("Oliver Endriss");
 136 MODULE_LICENSE("GPL");