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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hid-picolcd_cir.c (3956B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/***************************************************************************
      3 *   Copyright (C) 2010-2012 by Bruno Prémont <bonbons@linux-vserver.org>  *
      4 *                                                                         *
      5 *   Based on Logitech G13 driver (v0.4)                                   *
      6 *     Copyright (C) 2009 by Rick L. Vinyard, Jr. <rvinyard@cs.nmsu.edu>   *
      7 *                                                                         *
      8 ***************************************************************************/
      9
     10#include <linux/hid.h>
     11#include <linux/hid-debug.h>
     12#include <linux/input.h>
     13#include "hid-ids.h"
     14
     15#include <linux/fb.h>
     16#include <linux/vmalloc.h>
     17#include <linux/backlight.h>
     18#include <linux/lcd.h>
     19
     20#include <linux/leds.h>
     21
     22#include <linux/seq_file.h>
     23#include <linux/debugfs.h>
     24
     25#include <linux/completion.h>
     26#include <linux/uaccess.h>
     27#include <linux/module.h>
     28#include <media/rc-core.h>
     29
     30#include "hid-picolcd.h"
     31
     32
     33int picolcd_raw_cir(struct picolcd_data *data,
     34		struct hid_report *report, u8 *raw_data, int size)
     35{
     36	unsigned long flags;
     37	int i, w, sz;
     38	struct ir_raw_event rawir = {};
     39
     40	/* ignore if rc_dev is NULL or status is shunned */
     41	spin_lock_irqsave(&data->lock, flags);
     42	if (!data->rc_dev || (data->status & PICOLCD_CIR_SHUN)) {
     43		spin_unlock_irqrestore(&data->lock, flags);
     44		return 1;
     45	}
     46	spin_unlock_irqrestore(&data->lock, flags);
     47
     48	/* PicoLCD USB packets contain 16-bit intervals in network order,
     49	 * with value negated for pulse. Intervals are in microseconds.
     50	 *
     51	 * Note: some userspace LIRC code for PicoLCD says negated values
     52	 * for space - is it a matter of IR chip? (pulse for my TSOP2236)
     53	 *
     54	 * In addition, the first interval seems to be around 15000 + base
     55	 * interval for non-first report of IR data - thus the quirk below
     56	 * to get RC_CODE to understand Sony and JVC remotes I have at hand
     57	 */
     58	sz = size > 0 ? min((int)raw_data[0], size-1) : 0;
     59	for (i = 0; i+1 < sz; i += 2) {
     60		w = (raw_data[i] << 8) | (raw_data[i+1]);
     61		rawir.pulse = !!(w & 0x8000);
     62		rawir.duration = rawir.pulse ? (65536 - w) : w;
     63		/* Quirk!! - see above */
     64		if (i == 0 && rawir.duration > 15000)
     65			rawir.duration -= 15000;
     66		ir_raw_event_store(data->rc_dev, &rawir);
     67	}
     68	ir_raw_event_handle(data->rc_dev);
     69
     70	return 1;
     71}
     72
     73static int picolcd_cir_open(struct rc_dev *dev)
     74{
     75	struct picolcd_data *data = dev->priv;
     76	unsigned long flags;
     77
     78	spin_lock_irqsave(&data->lock, flags);
     79	data->status &= ~PICOLCD_CIR_SHUN;
     80	spin_unlock_irqrestore(&data->lock, flags);
     81	return 0;
     82}
     83
     84static void picolcd_cir_close(struct rc_dev *dev)
     85{
     86	struct picolcd_data *data = dev->priv;
     87	unsigned long flags;
     88
     89	spin_lock_irqsave(&data->lock, flags);
     90	data->status |= PICOLCD_CIR_SHUN;
     91	spin_unlock_irqrestore(&data->lock, flags);
     92}
     93
     94/* initialize CIR input device */
     95int picolcd_init_cir(struct picolcd_data *data, struct hid_report *report)
     96{
     97	struct rc_dev *rdev;
     98	int ret = 0;
     99
    100	rdev = rc_allocate_device(RC_DRIVER_IR_RAW);
    101	if (!rdev)
    102		return -ENOMEM;
    103
    104	rdev->priv             = data;
    105	rdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
    106	rdev->open             = picolcd_cir_open;
    107	rdev->close            = picolcd_cir_close;
    108	rdev->device_name      = data->hdev->name;
    109	rdev->input_phys       = data->hdev->phys;
    110	rdev->input_id.bustype = data->hdev->bus;
    111	rdev->input_id.vendor  = data->hdev->vendor;
    112	rdev->input_id.product = data->hdev->product;
    113	rdev->input_id.version = data->hdev->version;
    114	rdev->dev.parent       = &data->hdev->dev;
    115	rdev->driver_name      = PICOLCD_NAME;
    116	rdev->map_name         = RC_MAP_RC6_MCE;
    117	rdev->timeout          = MS_TO_US(100);
    118	rdev->rx_resolution    = 1;
    119
    120	ret = rc_register_device(rdev);
    121	if (ret)
    122		goto err;
    123	data->rc_dev = rdev;
    124	return 0;
    125
    126err:
    127	rc_free_device(rdev);
    128	return ret;
    129}
    130
    131void picolcd_exit_cir(struct picolcd_data *data)
    132{
    133	struct rc_dev *rdev = data->rc_dev;
    134
    135	data->rc_dev = NULL;
    136	rc_unregister_device(rdev);
    137}
    138