nvec_ps2.c

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/*
 * nvec_ps2: mouse driver for a NVIDIA compliant embedded controller
 *
 * Copyright (C) 2011 The AC100 Kernel Team <[email protected]>
 *
 * Authors:  Pierre-Hugues Husson <[email protected]>
 *           Ilya Petrov <[email protected]>
 *           Marc Dietrich <[email protected]>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/serio.h>
#include <linux/delay.h>
#include <linux/platform_device.h>

#include "nvec.h"

#define START_STREAMING {'\x06', '\x03', '\x06'}
#define STOP_STREAMING  {'\x06', '\x04'}
#define SEND_COMMAND    {'\x06', '\x01', '\xf4', '\x01'}

#ifdef NVEC_PS2_DEBUG
#define NVEC_PHD(str, buf, len) \
    print_hex_dump(KERN_DEBUG, str, DUMP_PREFIX_NONE, \
            16, 1, buf, len, false)
#else
#define NVEC_PHD(str, buf, len)
#endif

static const unsigned char MOUSE_RESET[] = {'\x06', '\x01', '\xff', '\x03'};

struct nvec_ps2 {
    struct serio *ser_dev;
    struct notifier_block notifier;
    struct nvec_chip *nvec;
};

static struct nvec_ps2 ps2_dev;

static int ps2_startstreaming(struct serio *ser_dev)
{
    unsigned char buf[] = START_STREAMING;
    return nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
}

static void ps2_stopstreaming(struct serio *ser_dev)
{
    unsigned char buf[] = STOP_STREAMING;
    nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
}

static int ps2_sendcommand(struct serio *ser_dev, unsigned char cmd)
{
    unsigned char buf[] = SEND_COMMAND;

    buf[2] = cmd & 0xff;

    dev_dbg(&ser_dev->dev, "Sending ps2 cmd %02x\n", cmd);
    return nvec_write_async(ps2_dev.nvec, buf, sizeof(buf));
}

static int nvec_ps2_notifier(struct notifier_block *nb,
                 unsigned long event_type, void *data)
{
    int i;
    unsigned char *msg = (unsigned char *)data;

    switch (event_type) {
    case NVEC_PS2_EVT:
        for (i = 0; i < msg[1]; i++)
            serio_interrupt(ps2_dev.ser_dev, msg[2 + i], 0);
        NVEC_PHD("ps/2 mouse event: ", &msg[2], msg[1]);
        return NOTIFY_STOP;

    case NVEC_PS2:
        if (msg[2] == 1) {
            for (i = 0; i < (msg[1] - 2); i++)
                serio_interrupt(ps2_dev.ser_dev, msg[i + 4], 0);
            NVEC_PHD("ps/2 mouse reply: ", &msg[4], msg[1] - 2);
        }

        else if (msg[1] != 2) /* !ack */
            NVEC_PHD("unhandled mouse event: ", msg, msg[1] + 2);
        return NOTIFY_STOP;
    }

    return NOTIFY_DONE;
}

static int __devinit nvec_mouse_probe(struct platform_device *pdev)
{
    struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
    struct serio *ser_dev;

    ser_dev = devm_kzalloc(&pdev->dev, sizeof(struct serio), GFP_KERNEL);
    if (ser_dev == NULL)
        return -ENOMEM;

    ser_dev->id.type = SERIO_PS_PSTHRU;
    ser_dev->write = ps2_sendcommand;
    ser_dev->start = ps2_startstreaming;
    ser_dev->stop = ps2_stopstreaming;

    strlcpy(ser_dev->name, "nvec mouse", sizeof(ser_dev->name));
    strlcpy(ser_dev->phys, "nvec", sizeof(ser_dev->phys));

    ps2_dev.ser_dev = ser_dev;
    ps2_dev.notifier.notifier_call = nvec_ps2_notifier;
    ps2_dev.nvec = nvec;
    nvec_register_notifier(nvec, &ps2_dev.notifier, 0);

    serio_register_port(ser_dev);

    /* mouse reset */
    nvec_write_async(nvec, MOUSE_RESET, 4);

    return 0;
}

static int __devexit nvec_mouse_remove(struct platform_device *pdev)
{
    serio_unregister_port(ps2_dev.ser_dev);

    return 0;
}

#ifdef CONFIG_PM_SLEEP
static int nvec_mouse_suspend(struct device *dev)
{
    struct platform_device *pdev = to_platform_device(dev);
    struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);

    /* disable mouse */
    nvec_write_async(nvec, "\x06\xf4", 2);

    /* send cancel autoreceive */
    nvec_write_async(nvec, "\x06\x04", 2);

    return 0;
}

static int nvec_mouse_resume(struct device *dev)
{
    struct platform_device *pdev = to_platform_device(dev);
    struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);

    ps2_startstreaming(ps2_dev.ser_dev);

    /* enable mouse */
    nvec_write_async(nvec, "\x06\xf5", 2);

    return 0;
}
#endif

static const SIMPLE_DEV_PM_OPS(nvec_mouse_pm_ops, nvec_mouse_suspend,
                nvec_mouse_resume);

static struct platform_driver nvec_mouse_driver = {
    .probe  = nvec_mouse_probe,
    .remove = __devexit_p(nvec_mouse_remove),
    .driver = {
        .name = "nvec-mouse",
        .owner = THIS_MODULE,
        .pm = &nvec_mouse_pm_ops,
    },
};

module_platform_driver(nvec_mouse_driver);

MODULE_DESCRIPTION("NVEC mouse driver");
MODULE_AUTHOR("Marc Dietrich <[email protected]>");
MODULE_LICENSE("GPL");