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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lnbp22.c (3171B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * lnbp22.h - driver for lnb supply and control ic lnbp22
      4 *
      5 * Copyright (C) 2006 Dominik Kuhlen
      6 * Based on lnbp21 driver
      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/moduleparam.h>
     16#include <linux/string.h>
     17#include <linux/slab.h>
     18
     19#include <media/dvb_frontend.h>
     20#include "lnbp22.h"
     21
     22static int debug;
     23module_param(debug, int, 0644);
     24MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
     25
     26
     27#define dprintk(lvl, arg...) if (debug >= (lvl)) printk(arg)
     28
     29struct lnbp22 {
     30	u8		    config[4];
     31	struct i2c_adapter *i2c;
     32};
     33
     34static int lnbp22_set_voltage(struct dvb_frontend *fe,
     35			      enum fe_sec_voltage voltage)
     36{
     37	struct lnbp22 *lnbp22 = (struct lnbp22 *)fe->sec_priv;
     38	struct i2c_msg msg = {
     39		.addr = 0x08,
     40		.flags = 0,
     41		.buf = (char *)&lnbp22->config,
     42		.len = sizeof(lnbp22->config),
     43	};
     44
     45	dprintk(1, "%s: %d (18V=%d 13V=%d)\n", __func__, voltage,
     46	       SEC_VOLTAGE_18, SEC_VOLTAGE_13);
     47
     48	lnbp22->config[3] = 0x60; /* Power down */
     49	switch (voltage) {
     50	case SEC_VOLTAGE_OFF:
     51		break;
     52	case SEC_VOLTAGE_13:
     53		lnbp22->config[3] |= LNBP22_EN;
     54		break;
     55	case SEC_VOLTAGE_18:
     56		lnbp22->config[3] |= (LNBP22_EN | LNBP22_VSEL);
     57		break;
     58	default:
     59		return -EINVAL;
     60	}
     61
     62	dprintk(1, "%s: 0x%02x)\n", __func__, lnbp22->config[3]);
     63	return (i2c_transfer(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO;
     64}
     65
     66static int lnbp22_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
     67{
     68	struct lnbp22 *lnbp22 = (struct lnbp22 *) fe->sec_priv;
     69	struct i2c_msg msg = {
     70		.addr = 0x08,
     71		.flags = 0,
     72		.buf = (char *)&lnbp22->config,
     73		.len = sizeof(lnbp22->config),
     74	};
     75
     76	dprintk(1, "%s: %d\n", __func__, (int)arg);
     77	if (arg)
     78		lnbp22->config[3] |= LNBP22_LLC;
     79	else
     80		lnbp22->config[3] &= ~LNBP22_LLC;
     81
     82	return (i2c_transfer(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO;
     83}
     84
     85static void lnbp22_release(struct dvb_frontend *fe)
     86{
     87	dprintk(1, "%s\n", __func__);
     88	/* LNBP power off */
     89	lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF);
     90
     91	/* free data */
     92	kfree(fe->sec_priv);
     93	fe->sec_priv = NULL;
     94}
     95
     96struct dvb_frontend *lnbp22_attach(struct dvb_frontend *fe,
     97					struct i2c_adapter *i2c)
     98{
     99	struct lnbp22 *lnbp22 = kmalloc(sizeof(struct lnbp22), GFP_KERNEL);
    100	if (!lnbp22)
    101		return NULL;
    102
    103	/* default configuration */
    104	lnbp22->config[0] = 0x00; /* ? */
    105	lnbp22->config[1] = 0x28; /* ? */
    106	lnbp22->config[2] = 0x48; /* ? */
    107	lnbp22->config[3] = 0x60; /* Power down */
    108	lnbp22->i2c = i2c;
    109	fe->sec_priv = lnbp22;
    110
    111	/* detect if it is present or not */
    112	if (lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF)) {
    113		dprintk(0, "%s LNBP22 not found\n", __func__);
    114		kfree(lnbp22);
    115		fe->sec_priv = NULL;
    116		return NULL;
    117	}
    118
    119	/* install release callback */
    120	fe->ops.release_sec = lnbp22_release;
    121
    122	/* override frontend ops */
    123	fe->ops.set_voltage = lnbp22_set_voltage;
    124	fe->ops.enable_high_lnb_voltage = lnbp22_enable_high_lnb_voltage;
    125
    126	return fe;
    127}
    128EXPORT_SYMBOL(lnbp22_attach);
    129
    130MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp22");
    131MODULE_AUTHOR("Dominik Kuhlen");
    132MODULE_LICENSE("GPL");