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 *
  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 "isl6421.h"
  37
  38struct isl6421 {
  39        u8                      config;
  40        u8                      override_or;
  41        u8                      override_and;
  42        struct i2c_adapter      *i2c;
  43        u8                      i2c_addr;
  44};
  45
  46static int isl6421_set_voltage(struct dvb_frontend *fe,
  47                               enum fe_sec_voltage 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
  75static 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
  93static int isl6421_set_tone(struct dvb_frontend *fe,
  94                            enum fe_sec_tone_mode tone)
  95{
  96        struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
  97        struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
  98                               .buf = &isl6421->config,
  99                               .len = sizeof(isl6421->config) };
 100
 101        switch (tone) {
 102        case SEC_TONE_ON:
 103                isl6421->config |= ISL6421_ENT1;
 104                break;
 105        case SEC_TONE_OFF:
 106                isl6421->config &= ~ISL6421_ENT1;
 107                break;
 108        default:
 109                return -EINVAL;
 110        }
 111
 112        isl6421->config |= isl6421->override_or;
 113        isl6421->config &= isl6421->override_and;
 114
 115        return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
 116}
 117
 118static void isl6421_release(struct dvb_frontend *fe)
 119{
 120        /* power off */
 121        isl6421_set_voltage(fe, SEC_VOLTAGE_OFF);
 122
 123        /* free */
 124        kfree(fe->sec_priv);
 125        fe->sec_priv = NULL;
 126}
 127
 128struct dvb_frontend *isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr,
 129                   u8 override_set, u8 override_clear, bool override_tone)
 130{
 131        struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL);
 132        if (!isl6421)
 133                return NULL;
 134
 135        /* default configuration */
 136        isl6421->config = ISL6421_ISEL1;
 137        isl6421->i2c = i2c;
 138        isl6421->i2c_addr = i2c_addr;
 139        fe->sec_priv = isl6421;
 140
 141        /* bits which should be forced to '1' */
 142        isl6421->override_or = override_set;
 143
 144        /* bits which should be forced to '0' */
 145        isl6421->override_and = ~override_clear;
 146
 147        /* detect if it is present or not */
 148        if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) {
 149                kfree(isl6421);
 150                fe->sec_priv = NULL;
 151                return NULL;
 152        }
 153
 154        /* install release callback */
 155        fe->ops.release_sec = isl6421_release;
 156
 157        /* override frontend ops */
 158        fe->ops.set_voltage = isl6421_set_voltage;
 159        fe->ops.enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage;
 160        if (override_tone)
 161                fe->ops.set_tone = isl6421_set_tone;
 162
 163        return fe;
 164}
 165EXPORT_SYMBOL(isl6421_attach);
 166
 167MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421");
 168MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss");
 169MODULE_LICENSE("GPL");
 170