LXR linux/drivers/media/dvb-frontends/isl6405.c

   1/*
   2 * isl6405.c - driver for dual lnb supply and control ic ISL6405
   3 *
   4 * Copyright (C) 2008 Hartmut Hackmann
   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 https://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 "isl6405.h"
  37
  38struct isl6405 {
  39        u8                      config;
  40        u8                      override_or;
  41        u8                      override_and;
  42        struct i2c_adapter      *i2c;
  43        u8                      i2c_addr;
  44};
  45
  46static int isl6405_set_voltage(struct dvb_frontend *fe,
  47                               enum fe_sec_voltage voltage)
  48{
  49        struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
  50        struct i2c_msg msg = {  .addr = isl6405->i2c_addr, .flags = 0,
  51                                .buf = &isl6405->config,
  52                                .len = sizeof(isl6405->config) };
  53
  54        if (isl6405->override_or & 0x80) {
  55                isl6405->config &= ~(ISL6405_VSEL2 | ISL6405_EN2);
  56                switch (voltage) {
  57                case SEC_VOLTAGE_OFF:
  58                        break;
  59                case SEC_VOLTAGE_13:
  60                        isl6405->config |= ISL6405_EN2;
  61                        break;
  62                case SEC_VOLTAGE_18:
  63                        isl6405->config |= (ISL6405_EN2 | ISL6405_VSEL2);
  64                        break;
  65                default:
  66                        return -EINVAL;
  67                }
  68        } else {
  69                isl6405->config &= ~(ISL6405_VSEL1 | ISL6405_EN1);
  70                switch (voltage) {
  71                case SEC_VOLTAGE_OFF:
  72                        break;
  73                case SEC_VOLTAGE_13:
  74                        isl6405->config |= ISL6405_EN1;
  75                        break;
  76                case SEC_VOLTAGE_18:
  77                        isl6405->config |= (ISL6405_EN1 | ISL6405_VSEL1);
  78                        break;
  79                default:
  80                        return -EINVAL;
  81                }
  82        }
  83        isl6405->config |= isl6405->override_or;
  84        isl6405->config &= isl6405->override_and;
  85
  86        return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
  87}
  88
  89static int isl6405_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
  90{
  91        struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
  92        struct i2c_msg msg = {  .addr = isl6405->i2c_addr, .flags = 0,
  93                                .buf = &isl6405->config,
  94                                .len = sizeof(isl6405->config) };
  95
  96        if (isl6405->override_or & 0x80) {
  97                if (arg)
  98                        isl6405->config |= ISL6405_LLC2;
  99                else
 100                        isl6405->config &= ~ISL6405_LLC2;
 101        } else {
 102                if (arg)
 103                        isl6405->config |= ISL6405_LLC1;
 104                else
 105                        isl6405->config &= ~ISL6405_LLC1;
 106        }
 107        isl6405->config |= isl6405->override_or;
 108        isl6405->config &= isl6405->override_and;
 109
 110        return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
 111}
 112
 113static void isl6405_release(struct dvb_frontend *fe)
 114{
 115        /* power off */
 116        isl6405_set_voltage(fe, SEC_VOLTAGE_OFF);
 117
 118        /* free */
 119        kfree(fe->sec_priv);
 120        fe->sec_priv = NULL;
 121}
 122
 123struct dvb_frontend *isl6405_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c,
 124                                    u8 i2c_addr, u8 override_set, u8 override_clear)
 125{
 126        struct isl6405 *isl6405 = kmalloc(sizeof(struct isl6405), GFP_KERNEL);
 127        if (!isl6405)
 128                return NULL;
 129
 130        /* default configuration */
 131        if (override_set & 0x80)
 132                isl6405->config = ISL6405_ISEL2;
 133        else
 134                isl6405->config = ISL6405_ISEL1;
 135        isl6405->i2c = i2c;
 136        isl6405->i2c_addr = i2c_addr;
 137        fe->sec_priv = isl6405;
 138
 139        /* bits which should be forced to '1' */
 140        isl6405->override_or = override_set;
 141
 142        /* bits which should be forced to '0' */
 143        isl6405->override_and = ~override_clear;
 144
 145        /* detect if it is present or not */
 146        if (isl6405_set_voltage(fe, SEC_VOLTAGE_OFF)) {
 147                kfree(isl6405);
 148                fe->sec_priv = NULL;
 149                return NULL;
 150        }
 151
 152        /* install release callback */
 153        fe->ops.release_sec = isl6405_release;
 154
 155        /* override frontend ops */
 156        fe->ops.set_voltage = isl6405_set_voltage;
 157        fe->ops.enable_high_lnb_voltage = isl6405_enable_high_lnb_voltage;
 158
 159        return fe;
 160}
 161EXPORT_SYMBOL(isl6405_attach);
 162
 163MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6405");
 164MODULE_AUTHOR("Hartmut Hackmann & Oliver Endriss");
 165MODULE_LICENSE("GPL");
 166