hid-picolcd_cir.c

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/***************************************************************************
 *   Copyright (C) 2010-2012 by Bruno Prémont <[email protected]>  *
 *                                                                         *
 *   Based on Logitech G13 driver (v0.4)                                   *
 *     Copyright (C) 2009 by Rick L. Vinyard, Jr. <[email protected]>   *
 *                                                                         *
 *   This program is free software: you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation, version 2 of the License.               *
 *                                                                         *
 *   This driver is distributed in the hope that it will be useful, but    *
 *   WITHOUT ANY WARRANTY; without even the implied warranty of            *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      *
 *   General Public License for more details.                              *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this software. If not see <http://www.gnu.org/licenses/>.  *
 ***************************************************************************/

#include <linux/hid.h>
#include <linux/hid-debug.h>
#include <linux/input.h>
#include "hid-ids.h"
#include "usbhid/usbhid.h"
#include <linux/usb.h>

#include <linux/fb.h>
#include <linux/vmalloc.h>
#include <linux/backlight.h>
#include <linux/lcd.h>

#include <linux/leds.h>

#include <linux/seq_file.h>
#include <linux/debugfs.h>

#include <linux/completion.h>
#include <linux/uaccess.h>
#include <linux/module.h>
#include <media/rc-core.h>

#include "hid-picolcd.h"


int picolcd_raw_cir(struct picolcd_data *data,
        struct hid_report *report, u8 *raw_data, int size)
{
    unsigned long flags;
    int i, w, sz;
    DEFINE_IR_RAW_EVENT(rawir);

    /* ignore if rc_dev is NULL or status is shunned */
    spin_lock_irqsave(&data->lock, flags);
    if (!data->rc_dev || (data->status & PICOLCD_CIR_SHUN)) {
        spin_unlock_irqrestore(&data->lock, flags);
        return 1;
    }
    spin_unlock_irqrestore(&data->lock, flags);

    /* PicoLCD USB packets contain 16-bit intervals in network order,
     * with value negated for pulse. Intervals are in microseconds.
     *
     * Note: some userspace LIRC code for PicoLCD says negated values
     * for space - is it a matter of IR chip? (pulse for my TSOP2236)
     *
     * In addition, the first interval seems to be around 15000 + base
     * interval for non-first report of IR data - thus the quirk below
     * to get RC_CODE to understand Sony and JVC remotes I have at hand
     */
    sz = size > 0 ? min((int)raw_data[0], size-1) : 0;
    for (i = 0; i+1 < sz; i += 2) {
        init_ir_raw_event(&rawir);
        w = (raw_data[i] << 8) | (raw_data[i+1]);
        rawir.pulse = !!(w & 0x8000);
        rawir.duration = US_TO_NS(rawir.pulse ? (65536 - w) : w);
        /* Quirk!! - see above */
        if (i == 0 && rawir.duration > 15000000)
            rawir.duration -= 15000000;
        ir_raw_event_store(data->rc_dev, &rawir);
    }
    ir_raw_event_handle(data->rc_dev);

    return 1;
}

static int picolcd_cir_open(struct rc_dev *dev)
{
    struct picolcd_data *data = dev->priv;
    unsigned long flags;

    spin_lock_irqsave(&data->lock, flags);
    data->status &= ~PICOLCD_CIR_SHUN;
    spin_unlock_irqrestore(&data->lock, flags);
    return 0;
}

static void picolcd_cir_close(struct rc_dev *dev)
{
    struct picolcd_data *data = dev->priv;
    unsigned long flags;

    spin_lock_irqsave(&data->lock, flags);
    data->status |= PICOLCD_CIR_SHUN;
    spin_unlock_irqrestore(&data->lock, flags);
}

/* initialize CIR input device */
int picolcd_init_cir(struct picolcd_data *data, struct hid_report *report)
{
    struct rc_dev *rdev;
    int ret = 0;

    rdev = rc_allocate_device();
    if (!rdev)
        return -ENOMEM;

    rdev->priv             = data;
    rdev->driver_type      = RC_DRIVER_IR_RAW;
    rdev->allowed_protos   = RC_TYPE_ALL;
    rdev->open             = picolcd_cir_open;
    rdev->close            = picolcd_cir_close;
    rdev->input_name       = data->hdev->name;
    rdev->input_phys       = data->hdev->phys;
    rdev->input_id.bustype = data->hdev->bus;
    rdev->input_id.vendor  = data->hdev->vendor;
    rdev->input_id.product = data->hdev->product;
    rdev->input_id.version = data->hdev->version;
    rdev->dev.parent       = &data->hdev->dev;
    rdev->driver_name      = PICOLCD_NAME;
    rdev->map_name         = RC_MAP_RC6_MCE;
    rdev->timeout          = MS_TO_NS(100);
    rdev->rx_resolution    = US_TO_NS(1);

    ret = rc_register_device(rdev);
    if (ret)
        goto err;
    data->rc_dev = rdev;
    return 0;

err:
    rc_free_device(rdev);
    return ret;
}

void picolcd_exit_cir(struct picolcd_data *data)
{
    struct rc_dev *rdev = data->rc_dev;

    data->rc_dev = NULL;
    rc_unregister_device(rdev);
}