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         struct 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                 w = (raw_data[i] << 8) | (raw_data[i+1]);
  71                 rawir.pulse = !!(w & 0x8000);
  72                 rawir.duration = US_TO_NS(rawir.pulse ? (65536 - w) : w);
  73                 /* Quirk!! - see above */
  74                 if (i == 0 && rawir.duration > 15000000)
  75                         rawir.duration -= 15000000;
  76                 ir_raw_event_store(data->rc_dev, &rawir);
  77         }
  78         ir_raw_event_handle(data->rc_dev);
  79
  80         return 1;
  81 }
  82
  83 static int picolcd_cir_open(struct rc_dev *dev)
  84 {
  85         struct picolcd_data *data = dev->priv;
  86         unsigned long flags;
  87
  88         spin_lock_irqsave(&data->lock, flags);
  89         data->status &= ~PICOLCD_CIR_SHUN;
  90         spin_unlock_irqrestore(&data->lock, flags);
  91         return 0;
  92 }
  93
  94 static void picolcd_cir_close(struct rc_dev *dev)
  95 {
  96         struct picolcd_data *data = dev->priv;
  97         unsigned long flags;
  98
  99         spin_lock_irqsave(&data->lock, flags);
 100         data->status |= PICOLCD_CIR_SHUN;
 101         spin_unlock_irqrestore(&data->lock, flags);
 102 }
 103
 104 /* initialize CIR input device */
 105 int picolcd_init_cir(struct picolcd_data *data, struct hid_report *report)
 106 {
 107         struct rc_dev *rdev;
 108         int ret = 0;
 109
 110         rdev = rc_allocate_device(RC_DRIVER_IR_RAW);
 111         if (!rdev)
 112                 return -ENOMEM;
 113
 114         rdev->priv             = data;
 115         rdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
 116         rdev->open             = picolcd_cir_open;
 117         rdev->close            = picolcd_cir_close;
 118         rdev->device_name      = data->hdev->name;
 119         rdev->input_phys       = data->hdev->phys;
 120         rdev->input_id.bustype = data->hdev->bus;
 121         rdev->input_id.vendor  = data->hdev->vendor;
 122         rdev->input_id.product = data->hdev->product;
 123         rdev->input_id.version = data->hdev->version;
 124         rdev->dev.parent       = &data->hdev->dev;
 125         rdev->driver_name      = PICOLCD_NAME;
 126         rdev->map_name         = RC_MAP_RC6_MCE;
 127         rdev->timeout          = MS_TO_NS(100);
 128         rdev->rx_resolution    = US_TO_NS(1);
 129
 130         ret = rc_register_device(rdev);
 131         if (ret)
 132                 goto err;
 133         data->rc_dev = rdev;
 134         return 0;
 135
 136 err:
 137         rc_free_device(rdev);
 138         return ret;
 139 }
 140
 141 void picolcd_exit_cir(struct picolcd_data *data)
 142 {
 143         struct rc_dev *rdev = data->rc_dev;
 144
 145         data->rc_dev = NULL;
 146         rc_unregister_device(rdev);
 147 }
 148