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         void                    (*release_chain)(struct dvb_frontend* fe);
  46 };
  47
  48 static int isl6421_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
  49 {
  50         struct isl6421 *isl6421 = (struct isl6421 *) fe->misc_priv;
  51         struct i2c_msg msg = {  .addr = isl6421->i2c_addr, .flags = 0,
  52                                 .buf = &isl6421->config,
  53                                 .len = sizeof(isl6421->config) };
  54
  55         isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1);
  56
  57         switch(voltage) {
  58         case SEC_VOLTAGE_OFF:
  59                 break;
  60         case SEC_VOLTAGE_13:
  61                 isl6421->config |= ISL6421_EN1;
  62                 break;
  63         case SEC_VOLTAGE_18:
  64                 isl6421->config |= (ISL6421_EN1 | ISL6421_VSEL1);
  65                 break;
  66         default:
  67                 return -EINVAL;
  68         };
  69
  70         isl6421->config |= isl6421->override_or;
  71         isl6421->config &= isl6421->override_and;
  72
  73         return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
  74 }
  75
  76 static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
  77 {
  78         struct isl6421 *isl6421 = (struct isl6421 *) fe->misc_priv;
  79         struct i2c_msg msg = {  .addr = isl6421->i2c_addr, .flags = 0,
  80                                 .buf = &isl6421->config,
  81                                 .len = sizeof(isl6421->config) };
  82
  83         if (arg)
  84                 isl6421->config |= ISL6421_LLC1;
  85         else
  86                 isl6421->config &= ~ISL6421_LLC1;
  87
  88         isl6421->config |= isl6421->override_or;
  89         isl6421->config &= isl6421->override_and;
  90
  91         return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
  92 }
  93
  94 static void isl6421_release(struct dvb_frontend *fe)
  95 {
  96         struct isl6421 *isl6421 = (struct isl6421 *) fe->misc_priv;
  97
  98         /* power off */
  99         isl6421_set_voltage(fe, SEC_VOLTAGE_OFF);
 100
 101         /* free data & call next release routine */
 102         fe->ops.release = isl6421->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 int isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr,
 110                    u8 override_set, u8 override_clear)
 111 {
 112         struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL);
 113         if (!isl6421)
 114                 return -ENOMEM;
 115
 116         /* default configuration */
 117         isl6421->config = ISL6421_ISEL1;
 118         isl6421->i2c = i2c;
 119         isl6421->i2c_addr = i2c_addr;
 120         fe->misc_priv = isl6421;
 121
 122         /* bits which should be forced to '1' */
 123         isl6421->override_or = override_set;
 124
 125         /* bits which should be forced to '0' */
 126         isl6421->override_and = ~override_clear;
 127
 128         /* detect if it is present or not */
 129         if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) {
 130                 kfree(isl6421);
 131                 fe->misc_priv = NULL;
 132                 return -EIO;
 133         }
 134
 135         /* install release callback */
 136         isl6421->release_chain = fe->ops.release;
 137         fe->ops.release = isl6421_release;
 138
 139         /* override frontend ops */
 140         fe->ops.set_voltage = isl6421_set_voltage;
 141         fe->ops.enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage;
 142
 143         return 0;
 144 }
 145 EXPORT_SYMBOL(isl6421_attach);
 146
 147 MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421");
 148 MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss");
 149 MODULE_LICENSE("GPL");