linux/drivers/hid/hid-picolcd_cir.c
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   1/***************************************************************************
   2 *   Copyright (C) 2010-2012 by Bruno Prémont <bonbons@linux-vserver.org>  *
   3 *                                                                         *
   4 *   Based on Logitech G13 driver (v0.4)                                   *
   5 *     Copyright (C) 2009 by Rick L. Vinyard, Jr. <rvinyard@cs.nmsu.edu>   *
   6 *                                                                         *
   7 *   This program is free software: you can redistribute it and/or modify  *
   8 *   it under the terms of the GNU General Public License as published by  *
   9 *   the Free Software Foundation, version 2 of the License.               *
  10 *                                                                         *
  11 *   This driver is distributed in the hope that it will be useful, but    *
  12 *   WITHOUT ANY WARRANTY; without even the implied warranty of            *
  13 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      *
  14 *   General Public License for more details.                              *
  15 *                                                                         *
  16 *   You should have received a copy of the GNU General Public License     *
  17 *   along with this software. If not see <http://www.gnu.org/licenses/>.  *
  18 ***************************************************************************/
  19
  20#include <linux/hid.h>
  21#include <linux/hid-debug.h>
  22#include <linux/input.h>
  23#include "hid-ids.h"
  24
  25#include <linux/fb.h>
  26#include <linux/vmalloc.h>
  27#include <linux/backlight.h>
  28#include <linux/lcd.h>
  29
  30#include <linux/leds.h>
  31
  32#include <linux/seq_file.h>
  33#include <linux/debugfs.h>
  34
  35#include <linux/completion.h>
  36#include <linux/uaccess.h>
  37#include <linux/module.h>
  38#include <media/rc-core.h>
  39
  40#include "hid-picolcd.h"
  41
  42
  43int picolcd_raw_cir(struct picolcd_data *data,
  44                struct hid_report *report, u8 *raw_data, int size)
  45{
  46        unsigned long flags;
  47        int i, w, sz;
  48        DEFINE_IR_RAW_EVENT(rawir);
  49
  50        /* ignore if rc_dev is NULL or status is shunned */
  51        spin_lock_irqsave(&data->lock, flags);
  52        if (!data->rc_dev || (data->status & PICOLCD_CIR_SHUN)) {
  53                spin_unlock_irqrestore(&data->lock, flags);
  54                return 1;
  55        }
  56        spin_unlock_irqrestore(&data->lock, flags);
  57
  58        /* PicoLCD USB packets contain 16-bit intervals in network order,
  59         * with value negated for pulse. Intervals are in microseconds.
  60         *
  61         * Note: some userspace LIRC code for PicoLCD says negated values
  62         * for space - is it a matter of IR chip? (pulse for my TSOP2236)
  63         *
  64         * In addition, the first interval seems to be around 15000 + base
  65         * interval for non-first report of IR data - thus the quirk below
  66         * to get RC_CODE to understand Sony and JVC remotes I have at hand
  67         */
  68        sz = size > 0 ? min((int)raw_data[0], size-1) : 0;
  69        for (i = 0; i+1 < sz; i += 2) {
  70                init_ir_raw_event(&rawir);
  71                w = (raw_data[i] << 8) | (raw_data[i+1]);
  72                rawir.pulse = !!(w & 0x8000);
  73                rawir.duration = US_TO_NS(rawir.pulse ? (65536 - w) : w);
  74                /* Quirk!! - see above */
  75                if (i == 0 && rawir.duration > 15000000)
  76                        rawir.duration -= 15000000;
  77                ir_raw_event_store(data->rc_dev, &rawir);
  78        }
  79        ir_raw_event_handle(data->rc_dev);
  80
  81        return 1;
  82}
  83
  84static int picolcd_cir_open(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        return 0;
  93}
  94
  95static void picolcd_cir_close(struct rc_dev *dev)
  96{
  97        struct picolcd_data *data = dev->priv;
  98        unsigned long flags;
  99
 100        spin_lock_irqsave(&data->lock, flags);
 101        data->status |= PICOLCD_CIR_SHUN;
 102        spin_unlock_irqrestore(&data->lock, flags);
 103}
 104
 105/* initialize CIR input device */
 106int picolcd_init_cir(struct picolcd_data *data, struct hid_report *report)
 107{
 108        struct rc_dev *rdev;
 109        int ret = 0;
 110
 111        rdev = rc_allocate_device();
 112        if (!rdev)
 113                return -ENOMEM;
 114
 115        rdev->priv             = data;
 116        rdev->driver_type      = RC_DRIVER_IR_RAW;
 117        rdev->allowed_protos   = RC_BIT_ALL;
 118        rdev->open             = picolcd_cir_open;
 119        rdev->close            = picolcd_cir_close;
 120        rdev->input_name       = data->hdev->name;
 121        rdev->input_phys       = data->hdev->phys;
 122        rdev->input_id.bustype = data->hdev->bus;
 123        rdev->input_id.vendor  = data->hdev->vendor;
 124        rdev->input_id.product = data->hdev->product;
 125        rdev->input_id.version = data->hdev->version;
 126        rdev->dev.parent       = &data->hdev->dev;
 127        rdev->driver_name      = PICOLCD_NAME;
 128        rdev->map_name         = RC_MAP_RC6_MCE;
 129        rdev->timeout          = MS_TO_NS(100);
 130        rdev->rx_resolution    = US_TO_NS(1);
 131
 132        ret = rc_register_device(rdev);
 133        if (ret)
 134                goto err;
 135        data->rc_dev = rdev;
 136        return 0;
 137
 138err:
 139        rc_free_device(rdev);
 140        return ret;
 141}
 142
 143void picolcd_exit_cir(struct picolcd_data *data)
 144{
 145        struct rc_dev *rdev = data->rc_dev;
 146
 147        data->rc_dev = NULL;
 148        rc_unregister_device(rdev);
 149}
 150
 151
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