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