release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/media/dvb/frontends/isl6421.c

   1 /*
   2  * isl6421.h - driver for lnb supply and control ic ISL6421
   3  *
   4  * Copyright (C) 2006 Andrew de Quincey
   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 "isl6421.h"
  37
  38 struct isl6421 {
  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 isl6421_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
  47 {
  48         struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
  49         struct i2c_msg msg = {  .addr = isl6421->i2c_addr, .flags = 0,
  50                                 .buf = &isl6421->config,
  51                                 .len = sizeof(isl6421->config) };
  52
  53         isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1);
  54
  55         switch(voltage) {
  56         case SEC_VOLTAGE_OFF:
  57                 break;
  58         case SEC_VOLTAGE_13:
  59                 isl6421->config |= ISL6421_EN1;
  60                 break;
  61         case SEC_VOLTAGE_18:
  62                 isl6421->config |= (ISL6421_EN1 | ISL6421_VSEL1);
  63                 break;
  64         default:
  65                 return -EINVAL;
  66         };
  67
  68         isl6421->config |= isl6421->override_or;
  69         isl6421->config &= isl6421->override_and;
  70
  71         return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
  72 }
  73
  74 static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
  75 {
  76         struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
  77         struct i2c_msg msg = {  .addr = isl6421->i2c_addr, .flags = 0,
  78                                 .buf = &isl6421->config,
  79                                 .len = sizeof(isl6421->config) };
  80
  81         if (arg)
  82                 isl6421->config |= ISL6421_LLC1;
  83         else
  84                 isl6421->config &= ~ISL6421_LLC1;
  85
  86         isl6421->config |= isl6421->override_or;
  87         isl6421->config &= isl6421->override_and;
  88
  89         return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
  90 }
  91
  92 static void isl6421_release(struct dvb_frontend *fe)
  93 {
  94         /* power off */
  95         isl6421_set_voltage(fe, SEC_VOLTAGE_OFF);
  96
  97         /* free */
  98         kfree(fe->sec_priv);
  99         fe->sec_priv = NULL;
 100 }
 101
 102 struct dvb_frontend *isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr,
 103                    u8 override_set, u8 override_clear)
 104 {
 105         struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL);
 106         if (!isl6421)
 107                 return NULL;
 108
 109         /* default configuration */
 110         isl6421->config = ISL6421_ISEL1;
 111         isl6421->i2c = i2c;
 112         isl6421->i2c_addr = i2c_addr;
 113         fe->sec_priv = isl6421;
 114
 115         /* bits which should be forced to '1' */
 116         isl6421->override_or = override_set;
 117
 118         /* bits which should be forced to '0' */
 119         isl6421->override_and = ~override_clear;
 120
 121         /* detect if it is present or not */
 122         if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) {
 123                 kfree(isl6421);
 124                 fe->sec_priv = NULL;
 125                 return NULL;
 126         }
 127
 128         /* install release callback */
 129         fe->ops.release_sec = isl6421_release;
 130
 131         /* override frontend ops */
 132         fe->ops.set_voltage = isl6421_set_voltage;
 133         fe->ops.enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage;
 134
 135         return fe;
 136 }
 137 EXPORT_SYMBOL(isl6421_attach);
 138
 139 MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421");
 140 MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss");
 141 MODULE_LICENSE("GPL");