LXR linux/drivers/hid/hid-picolcd

   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 = US_TO_NS(rawir.pulse ? (65536 - w) : w);
  63                /* Quirk!! - see above */
  64                if (i == 0 && rawir.duration > 15000000)
  65                        rawir.duration -= 15000000;
  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_NS(100);
 118        rdev->rx_resolution    = US_TO_NS(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
 139