LXR linux/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 * To obtain the license, point your browser to
  19 * http://www.gnu.org/copyleft/gpl.html
  20 *
  21 *
  22 * the project's page is at https://linuxtv.org
  23 */
  24#include <linux/delay.h>
  25#include <linux/errno.h>
  26#include <linux/init.h>
  27#include <linux/kernel.h>
  28#include <linux/module.h>
  29#include <linux/string.h>
  30#include <linux/slab.h>
  31
  32#include "dvb_frontend.h"
  33#include "isl6421.h"
  34
  35struct isl6421 {
  36        u8                      config;
  37        u8                      override_or;
  38        u8                      override_and;
  39        struct i2c_adapter      *i2c;
  40        u8                      i2c_addr;
  41};
  42
  43static int isl6421_set_voltage(struct dvb_frontend *fe,
  44                               enum fe_sec_voltage voltage)
  45{
  46        struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
  47        struct i2c_msg msg = {  .addr = isl6421->i2c_addr, .flags = 0,
  48                                .buf = &isl6421->config,
  49                                .len = sizeof(isl6421->config) };
  50
  51        isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1);
  52
  53        switch(voltage) {
  54        case SEC_VOLTAGE_OFF:
  55                break;
  56        case SEC_VOLTAGE_13:
  57                isl6421->config |= ISL6421_EN1;
  58                break;
  59        case SEC_VOLTAGE_18:
  60                isl6421->config |= (ISL6421_EN1 | ISL6421_VSEL1);
  61                break;
  62        default:
  63                return -EINVAL;
  64        }
  65
  66        isl6421->config |= isl6421->override_or;
  67        isl6421->config &= isl6421->override_and;
  68
  69        return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
  70}
  71
  72static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
  73{
  74        struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
  75        struct i2c_msg msg = {  .addr = isl6421->i2c_addr, .flags = 0,
  76                                .buf = &isl6421->config,
  77                                .len = sizeof(isl6421->config) };
  78
  79        if (arg)
  80                isl6421->config |= ISL6421_LLC1;
  81        else
  82                isl6421->config &= ~ISL6421_LLC1;
  83
  84        isl6421->config |= isl6421->override_or;
  85        isl6421->config &= isl6421->override_and;
  86
  87        return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
  88}
  89
  90static int isl6421_set_tone(struct dvb_frontend *fe,
  91                            enum fe_sec_tone_mode tone)
  92{
  93        struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
  94        struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
  95                               .buf = &isl6421->config,
  96                               .len = sizeof(isl6421->config) };
  97
  98        switch (tone) {
  99        case SEC_TONE_ON:
 100                isl6421->config |= ISL6421_ENT1;
 101                break;
 102        case SEC_TONE_OFF:
 103                isl6421->config &= ~ISL6421_ENT1;
 104                break;
 105        default:
 106                return -EINVAL;
 107        }
 108
 109        isl6421->config |= isl6421->override_or;
 110        isl6421->config &= isl6421->override_and;
 111
 112        return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
 113}
 114
 115static void isl6421_release(struct dvb_frontend *fe)
 116{
 117        /* power off */
 118        isl6421_set_voltage(fe, SEC_VOLTAGE_OFF);
 119
 120        /* free */
 121        kfree(fe->sec_priv);
 122        fe->sec_priv = NULL;
 123}
 124
 125struct dvb_frontend *isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr,
 126                   u8 override_set, u8 override_clear, bool override_tone)
 127{
 128        struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL);
 129        if (!isl6421)
 130                return NULL;
 131
 132        /* default configuration */
 133        isl6421->config = ISL6421_ISEL1;
 134        isl6421->i2c = i2c;
 135        isl6421->i2c_addr = i2c_addr;
 136        fe->sec_priv = isl6421;
 137
 138        /* bits which should be forced to '1' */
 139        isl6421->override_or = override_set;
 140
 141        /* bits which should be forced to '0' */
 142        isl6421->override_and = ~override_clear;
 143
 144        /* detect if it is present or not */
 145        if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) {
 146                kfree(isl6421);
 147                fe->sec_priv = NULL;
 148                return NULL;
 149        }
 150
 151        /* install release callback */
 152        fe->ops.release_sec = isl6421_release;
 153
 154        /* override frontend ops */
 155        fe->ops.set_voltage = isl6421_set_voltage;
 156        fe->ops.enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage;
 157        if (override_tone)
 158                fe->ops.set_tone = isl6421_set_tone;
 159
 160        return fe;
 161}
 162EXPORT_SYMBOL(isl6421_attach);
 163
 164MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421");
 165MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss");
 166MODULE_LICENSE("GPL");
 167