LXR linux/drivers/media/dvb-frontends/lnbp21.c

   1/*
   2 * lnbp21.c - driver for lnb supply and control ic lnbp21
   3 *
   4 * Copyright (C) 2006, 2009 Oliver Endriss <o.endriss@gmx.de>
   5 * Copyright (C) 2009 Igor M. Liplianin <liplianin@netup.ru>
   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 "lnbp21.h"
  34#include "lnbh24.h"
  35
  36struct lnbp21 {
  37        u8                      config;
  38        u8                      override_or;
  39        u8                      override_and;
  40        struct i2c_adapter      *i2c;
  41        u8                      i2c_addr;
  42};
  43
  44static int lnbp21_set_voltage(struct dvb_frontend *fe,
  45                              enum fe_sec_voltage voltage)
  46{
  47        struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
  48        struct i2c_msg msg = {  .addr = lnbp21->i2c_addr, .flags = 0,
  49                                .buf = &lnbp21->config,
  50                                .len = sizeof(lnbp21->config) };
  51
  52        lnbp21->config &= ~(LNBP21_VSEL | LNBP21_EN);
  53
  54        switch(voltage) {
  55        case SEC_VOLTAGE_OFF:
  56                break;
  57        case SEC_VOLTAGE_13:
  58                lnbp21->config |= LNBP21_EN;
  59                break;
  60        case SEC_VOLTAGE_18:
  61                lnbp21->config |= (LNBP21_EN | LNBP21_VSEL);
  62                break;
  63        default:
  64                return -EINVAL;
  65        }
  66
  67        lnbp21->config |= lnbp21->override_or;
  68        lnbp21->config &= lnbp21->override_and;
  69
  70        return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
  71}
  72
  73static int lnbp21_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
  74{
  75        struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
  76        struct i2c_msg msg = {  .addr = lnbp21->i2c_addr, .flags = 0,
  77                                .buf = &lnbp21->config,
  78                                .len = sizeof(lnbp21->config) };
  79
  80        if (arg)
  81                lnbp21->config |= LNBP21_LLC;
  82        else
  83                lnbp21->config &= ~LNBP21_LLC;
  84
  85        lnbp21->config |= lnbp21->override_or;
  86        lnbp21->config &= lnbp21->override_and;
  87
  88        return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
  89}
  90
  91static int lnbp21_set_tone(struct dvb_frontend *fe,
  92                           enum fe_sec_tone_mode tone)
  93{
  94        struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
  95        struct i2c_msg msg = {  .addr = lnbp21->i2c_addr, .flags = 0,
  96                                .buf = &lnbp21->config,
  97                                .len = sizeof(lnbp21->config) };
  98
  99        switch (tone) {
 100        case SEC_TONE_OFF:
 101                lnbp21->config &= ~LNBP21_TEN;
 102                break;
 103        case SEC_TONE_ON:
 104                lnbp21->config |= LNBP21_TEN;
 105                break;
 106        default:
 107                return -EINVAL;
 108        }
 109
 110        lnbp21->config |= lnbp21->override_or;
 111        lnbp21->config &= lnbp21->override_and;
 112
 113        return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
 114}
 115
 116static void lnbp21_release(struct dvb_frontend *fe)
 117{
 118        /* LNBP power off */
 119        lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF);
 120
 121        /* free data */
 122        kfree(fe->sec_priv);
 123        fe->sec_priv = NULL;
 124}
 125
 126static struct dvb_frontend *lnbx2x_attach(struct dvb_frontend *fe,
 127                                struct i2c_adapter *i2c, u8 override_set,
 128                                u8 override_clear, u8 i2c_addr, u8 config)
 129{
 130        struct lnbp21 *lnbp21 = kmalloc(sizeof(struct lnbp21), GFP_KERNEL);
 131        if (!lnbp21)
 132                return NULL;
 133
 134        /* default configuration */
 135        lnbp21->config = config;
 136        lnbp21->i2c = i2c;
 137        lnbp21->i2c_addr = i2c_addr;
 138        fe->sec_priv = lnbp21;
 139
 140        /* bits which should be forced to '1' */
 141        lnbp21->override_or = override_set;
 142
 143        /* bits which should be forced to '0' */
 144        lnbp21->override_and = ~override_clear;
 145
 146        /* detect if it is present or not */
 147        if (lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF)) {
 148                kfree(lnbp21);
 149                return NULL;
 150        }
 151
 152        /* install release callback */
 153        fe->ops.release_sec = lnbp21_release;
 154
 155        /* override frontend ops */
 156        fe->ops.set_voltage = lnbp21_set_voltage;
 157        fe->ops.enable_high_lnb_voltage = lnbp21_enable_high_lnb_voltage;
 158        if (!(override_clear & LNBH24_TEN)) /*22kHz logic controlled by demod*/
 159                fe->ops.set_tone = lnbp21_set_tone;
 160        printk(KERN_INFO "LNBx2x attached on addr=%x\n", lnbp21->i2c_addr);
 161
 162        return fe;
 163}
 164
 165struct dvb_frontend *lnbh24_attach(struct dvb_frontend *fe,
 166                                struct i2c_adapter *i2c, u8 override_set,
 167                                u8 override_clear, u8 i2c_addr)
 168{
 169        return lnbx2x_attach(fe, i2c, override_set, override_clear,
 170                                                        i2c_addr, LNBH24_TTX);
 171}
 172EXPORT_SYMBOL(lnbh24_attach);
 173
 174struct dvb_frontend *lnbp21_attach(struct dvb_frontend *fe,
 175                                struct i2c_adapter *i2c, u8 override_set,
 176                                u8 override_clear)
 177{
 178        return lnbx2x_attach(fe, i2c, override_set, override_clear,
 179                                                        0x08, LNBP21_ISEL);
 180}
 181EXPORT_SYMBOL(lnbp21_attach);
 182
 183MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp21, lnbh24");
 184MODULE_AUTHOR("Oliver Endriss, Igor M. Liplianin");
 185MODULE_LICENSE("GPL");
 186