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

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * lnbp21.c - driver for lnb supply and control ic lnbp21
   4 *
   5 * Copyright (C) 2006, 2009 Oliver Endriss <o.endriss@gmx.de>
   6 * Copyright (C) 2009 Igor M. Liplianin <liplianin@netup.ru>
   7 *
   8 * the project's page is at https://linuxtv.org
   9 */
  10#include <linux/delay.h>
  11#include <linux/errno.h>
  12#include <linux/init.h>
  13#include <linux/kernel.h>
  14#include <linux/module.h>
  15#include <linux/string.h>
  16#include <linux/slab.h>
  17
  18#include <media/dvb_frontend.h>
  19#include "lnbp21.h"
  20#include "lnbh24.h"
  21
  22struct lnbp21 {
  23        u8                      config;
  24        u8                      override_or;
  25        u8                      override_and;
  26        struct i2c_adapter      *i2c;
  27        u8                      i2c_addr;
  28};
  29
  30static int lnbp21_set_voltage(struct dvb_frontend *fe,
  31                              enum fe_sec_voltage voltage)
  32{
  33        struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
  34        struct i2c_msg msg = {  .addr = lnbp21->i2c_addr, .flags = 0,
  35                                .buf = &lnbp21->config,
  36                                .len = sizeof(lnbp21->config) };
  37
  38        lnbp21->config &= ~(LNBP21_VSEL | LNBP21_EN);
  39
  40        switch(voltage) {
  41        case SEC_VOLTAGE_OFF:
  42                break;
  43        case SEC_VOLTAGE_13:
  44                lnbp21->config |= LNBP21_EN;
  45                break;
  46        case SEC_VOLTAGE_18:
  47                lnbp21->config |= (LNBP21_EN | LNBP21_VSEL);
  48                break;
  49        default:
  50                return -EINVAL;
  51        }
  52
  53        lnbp21->config |= lnbp21->override_or;
  54        lnbp21->config &= lnbp21->override_and;
  55
  56        return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
  57}
  58
  59static int lnbp21_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
  60{
  61        struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
  62        struct i2c_msg msg = {  .addr = lnbp21->i2c_addr, .flags = 0,
  63                                .buf = &lnbp21->config,
  64                                .len = sizeof(lnbp21->config) };
  65
  66        if (arg)
  67                lnbp21->config |= LNBP21_LLC;
  68        else
  69                lnbp21->config &= ~LNBP21_LLC;
  70
  71        lnbp21->config |= lnbp21->override_or;
  72        lnbp21->config &= lnbp21->override_and;
  73
  74        return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
  75}
  76
  77static int lnbp21_set_tone(struct dvb_frontend *fe,
  78                           enum fe_sec_tone_mode tone)
  79{
  80        struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
  81        struct i2c_msg msg = {  .addr = lnbp21->i2c_addr, .flags = 0,
  82                                .buf = &lnbp21->config,
  83                                .len = sizeof(lnbp21->config) };
  84
  85        switch (tone) {
  86        case SEC_TONE_OFF:
  87                lnbp21->config &= ~LNBP21_TEN;
  88                break;
  89        case SEC_TONE_ON:
  90                lnbp21->config |= LNBP21_TEN;
  91                break;
  92        default:
  93                return -EINVAL;
  94        }
  95
  96        lnbp21->config |= lnbp21->override_or;
  97        lnbp21->config &= lnbp21->override_and;
  98
  99        return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
 100}
 101
 102static void lnbp21_release(struct dvb_frontend *fe)
 103{
 104        /* LNBP power off */
 105        lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF);
 106
 107        /* free data */
 108        kfree(fe->sec_priv);
 109        fe->sec_priv = NULL;
 110}
 111
 112static struct dvb_frontend *lnbx2x_attach(struct dvb_frontend *fe,
 113                                struct i2c_adapter *i2c, u8 override_set,
 114                                u8 override_clear, u8 i2c_addr, u8 config)
 115{
 116        struct lnbp21 *lnbp21 = kmalloc(sizeof(struct lnbp21), GFP_KERNEL);
 117        if (!lnbp21)
 118                return NULL;
 119
 120        /* default configuration */
 121        lnbp21->config = config;
 122        lnbp21->i2c = i2c;
 123        lnbp21->i2c_addr = i2c_addr;
 124        fe->sec_priv = lnbp21;
 125
 126        /* bits which should be forced to '1' */
 127        lnbp21->override_or = override_set;
 128
 129        /* bits which should be forced to '0' */
 130        lnbp21->override_and = ~override_clear;
 131
 132        /* detect if it is present or not */
 133        if (lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF)) {
 134                kfree(lnbp21);
 135                return NULL;
 136        }
 137
 138        /* install release callback */
 139        fe->ops.release_sec = lnbp21_release;
 140
 141        /* override frontend ops */
 142        fe->ops.set_voltage = lnbp21_set_voltage;
 143        fe->ops.enable_high_lnb_voltage = lnbp21_enable_high_lnb_voltage;
 144        if (!(override_clear & LNBH24_TEN)) /*22kHz logic controlled by demod*/
 145                fe->ops.set_tone = lnbp21_set_tone;
 146        printk(KERN_INFO "LNBx2x attached on addr=%x\n", lnbp21->i2c_addr);
 147
 148        return fe;
 149}
 150
 151struct dvb_frontend *lnbh24_attach(struct dvb_frontend *fe,
 152                                struct i2c_adapter *i2c, u8 override_set,
 153                                u8 override_clear, u8 i2c_addr)
 154{
 155        return lnbx2x_attach(fe, i2c, override_set, override_clear,
 156                                                        i2c_addr, LNBH24_TTX);
 157}
 158EXPORT_SYMBOL(lnbh24_attach);
 159
 160struct dvb_frontend *lnbp21_attach(struct dvb_frontend *fe,
 161                                struct i2c_adapter *i2c, u8 override_set,
 162                                u8 override_clear)
 163{
 164        return lnbx2x_attach(fe, i2c, override_set, override_clear,
 165                                                        0x08, LNBP21_ISEL);
 166}
 167EXPORT_SYMBOL(lnbp21_attach);
 168
 169MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp21, lnbh24");
 170MODULE_AUTHOR("Oliver Endriss, Igor M. Liplianin");
 171MODULE_LICENSE("GPL");
 172