drivers/hid/hid-picolcd_cir.c

   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
  43 int 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
  84 static 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
  95 static 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 */
 106 int 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(RC_DRIVER_IR_RAW);
 112         if (!rdev)
 113                 return -ENOMEM;
 114
 115         rdev->priv             = data;
 116         rdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
 117         rdev->open             = picolcd_cir_open;
 118         rdev->close            = picolcd_cir_close;
 119         rdev->device_name      = data->hdev->name;
 120         rdev->input_phys       = data->hdev->phys;
 121         rdev->input_id.bustype = data->hdev->bus;
 122         rdev->input_id.vendor  = data->hdev->vendor;
 123         rdev->input_id.product = data->hdev->product;
 124         rdev->input_id.version = data->hdev->version;
 125         rdev->dev.parent       = &data->hdev->dev;
 126         rdev->driver_name      = PICOLCD_NAME;
 127         rdev->map_name         = RC_MAP_RC6_MCE;
 128         rdev->timeout          = MS_TO_NS(100);
 129         rdev->rx_resolution    = US_TO_NS(1);
 130
 131         ret = rc_register_device(rdev);
 132         if (ret)
 133                 goto err;
 134         data->rc_dev = rdev;
 135         return 0;
 136
 137 err:
 138         rc_free_device(rdev);
 139         return ret;
 140 }
 141
 142 void picolcd_exit_cir(struct picolcd_data *data)
 143 {
 144         struct rc_dev *rdev = data->rc_dev;
 145
 146         data->rc_dev = NULL;
 147         rc_unregister_device(rdev);
 148 }
 149