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/moduleparam.h>
  33 #include <linux/string.h>
  34 #include <linux/slab.h>
  35
  36 #include "dvb_frontend.h"
  37 #include "isl6421.h"
  38
  39 struct isl6421 {
  40         u8                      config;
  41         u8                      override_or;
  42         u8                      override_and;
  43         struct i2c_adapter      *i2c;
  44         u8                      i2c_addr;
  45 };
  46
  47 static int isl6421_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
  48 {
  49         struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
  50         struct i2c_msg msg = {  .addr = isl6421->i2c_addr, .flags = 0,
  51                                 .buf = &isl6421->config,
  52                                 .len = sizeof(isl6421->config) };
  53
  54         isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1);
  55
  56         switch(voltage) {
  57         case SEC_VOLTAGE_OFF:
  58                 break;
  59         case SEC_VOLTAGE_13:
  60                 isl6421->config |= ISL6421_EN1;
  61                 break;
  62         case SEC_VOLTAGE_18:
  63                 isl6421->config |= (ISL6421_EN1 | ISL6421_VSEL1);
  64                 break;
  65         default:
  66                 return -EINVAL;
  67         };
  68
  69         isl6421->config |= isl6421->override_or;
  70         isl6421->config &= isl6421->override_and;
  71
  72         return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
  73 }
  74
  75 static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
  76 {
  77         struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
  78         struct i2c_msg msg = {  .addr = isl6421->i2c_addr, .flags = 0,
  79                                 .buf = &isl6421->config,
  80                                 .len = sizeof(isl6421->config) };
  81
  82         if (arg)
  83                 isl6421->config |= ISL6421_LLC1;
  84         else
  85                 isl6421->config &= ~ISL6421_LLC1;
  86
  87         isl6421->config |= isl6421->override_or;
  88         isl6421->config &= isl6421->override_and;
  89
  90         return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
  91 }
  92
  93 static void isl6421_release(struct dvb_frontend *fe)
  94 {
  95         /* power off */
  96         isl6421_set_voltage(fe, SEC_VOLTAGE_OFF);
  97
  98         /* free */
  99         kfree(fe->sec_priv);
 100         fe->sec_priv = NULL;
 101 }
 102
 103 struct dvb_frontend *isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr,
 104                    u8 override_set, u8 override_clear)
 105 {
 106         struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL);
 107         if (!isl6421)
 108                 return NULL;
 109
 110         /* default configuration */
 111         isl6421->config = ISL6421_ISEL1;
 112         isl6421->i2c = i2c;
 113         isl6421->i2c_addr = i2c_addr;
 114         fe->sec_priv = isl6421;
 115
 116         /* bits which should be forced to '1' */
 117         isl6421->override_or = override_set;
 118
 119         /* bits which should be forced to '0' */
 120         isl6421->override_and = ~override_clear;
 121
 122         /* detect if it is present or not */
 123         if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) {
 124                 kfree(isl6421);
 125                 fe->sec_priv = NULL;
 126                 return NULL;
 127         }
 128
 129         /* install release callback */
 130         fe->ops.release_sec = isl6421_release;
 131
 132         /* override frontend ops */
 133         fe->ops.set_voltage = isl6421_set_voltage;
 134         fe->ops.enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage;
 135
 136         return fe;
 137 }
 138 EXPORT_SYMBOL(isl6421_attach);
 139
 140 MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421");
 141 MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss");
 142 MODULE_LICENSE("GPL");