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

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * isl6405.c - driver for dual lnb supply and control ic ISL6405
   4 *
   5 * Copyright (C) 2008 Hartmut Hackmann
   6 * Copyright (C) 2006 Oliver Endriss
   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 "isl6405.h"
  20
  21struct isl6405 {
  22        u8                      config;
  23        u8                      override_or;
  24        u8                      override_and;
  25        struct i2c_adapter      *i2c;
  26        u8                      i2c_addr;
  27};
  28
  29static int isl6405_set_voltage(struct dvb_frontend *fe,
  30                               enum fe_sec_voltage voltage)
  31{
  32        struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
  33        struct i2c_msg msg = {  .addr = isl6405->i2c_addr, .flags = 0,
  34                                .buf = &isl6405->config,
  35                                .len = sizeof(isl6405->config) };
  36
  37        if (isl6405->override_or & 0x80) {
  38                isl6405->config &= ~(ISL6405_VSEL2 | ISL6405_EN2);
  39                switch (voltage) {
  40                case SEC_VOLTAGE_OFF:
  41                        break;
  42                case SEC_VOLTAGE_13:
  43                        isl6405->config |= ISL6405_EN2;
  44                        break;
  45                case SEC_VOLTAGE_18:
  46                        isl6405->config |= (ISL6405_EN2 | ISL6405_VSEL2);
  47                        break;
  48                default:
  49                        return -EINVAL;
  50                }
  51        } else {
  52                isl6405->config &= ~(ISL6405_VSEL1 | ISL6405_EN1);
  53                switch (voltage) {
  54                case SEC_VOLTAGE_OFF:
  55                        break;
  56                case SEC_VOLTAGE_13:
  57                        isl6405->config |= ISL6405_EN1;
  58                        break;
  59                case SEC_VOLTAGE_18:
  60                        isl6405->config |= (ISL6405_EN1 | ISL6405_VSEL1);
  61                        break;
  62                default:
  63                        return -EINVAL;
  64                }
  65        }
  66        isl6405->config |= isl6405->override_or;
  67        isl6405->config &= isl6405->override_and;
  68
  69        return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
  70}
  71
  72static int isl6405_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
  73{
  74        struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
  75        struct i2c_msg msg = {  .addr = isl6405->i2c_addr, .flags = 0,
  76                                .buf = &isl6405->config,
  77                                .len = sizeof(isl6405->config) };
  78
  79        if (isl6405->override_or & 0x80) {
  80                if (arg)
  81                        isl6405->config |= ISL6405_LLC2;
  82                else
  83                        isl6405->config &= ~ISL6405_LLC2;
  84        } else {
  85                if (arg)
  86                        isl6405->config |= ISL6405_LLC1;
  87                else
  88                        isl6405->config &= ~ISL6405_LLC1;
  89        }
  90        isl6405->config |= isl6405->override_or;
  91        isl6405->config &= isl6405->override_and;
  92
  93        return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
  94}
  95
  96static void isl6405_release(struct dvb_frontend *fe)
  97{
  98        /* power off */
  99        isl6405_set_voltage(fe, SEC_VOLTAGE_OFF);
 100
 101        /* free */
 102        kfree(fe->sec_priv);
 103        fe->sec_priv = NULL;
 104}
 105
 106struct dvb_frontend *isl6405_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c,
 107                                    u8 i2c_addr, u8 override_set, u8 override_clear)
 108{
 109        struct isl6405 *isl6405 = kmalloc(sizeof(struct isl6405), GFP_KERNEL);
 110        if (!isl6405)
 111                return NULL;
 112
 113        /* default configuration */
 114        if (override_set & 0x80)
 115                isl6405->config = ISL6405_ISEL2;
 116        else
 117                isl6405->config = ISL6405_ISEL1;
 118        isl6405->i2c = i2c;
 119        isl6405->i2c_addr = i2c_addr;
 120        fe->sec_priv = isl6405;
 121
 122        /* bits which should be forced to '1' */
 123        isl6405->override_or = override_set;
 124
 125        /* bits which should be forced to '0' */
 126        isl6405->override_and = ~override_clear;
 127
 128        /* detect if it is present or not */
 129        if (isl6405_set_voltage(fe, SEC_VOLTAGE_OFF)) {
 130                kfree(isl6405);
 131                fe->sec_priv = NULL;
 132                return NULL;
 133        }
 134
 135        /* install release callback */
 136        fe->ops.release_sec = isl6405_release;
 137
 138        /* override frontend ops */
 139        fe->ops.set_voltage = isl6405_set_voltage;
 140        fe->ops.enable_high_lnb_voltage = isl6405_enable_high_lnb_voltage;
 141
 142        return fe;
 143}
 144EXPORT_SYMBOL(isl6405_attach);
 145
 146MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6405");
 147MODULE_AUTHOR("Hartmut Hackmann & Oliver Endriss");
 148MODULE_LICENSE("GPL");
 149