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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lnbp21.c (4371B)

      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");