cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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isl6405.c (3678B)

      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");