drivers/hid/hid-picolcd_cir.c

   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
  33 int 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
  73 static 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
  84 static 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 */
  95 int 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
 126 err:
 127         rc_free_device(rdev);
 128         return ret;
 129 }
 130
 131 void 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