psw.c

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/*
 * arch/sh/boards/renesas/r7780rp/psw.c
 *
 * push switch support for RDBRP-1/RDBREVRP-1 debug boards.
 *
 * Copyright (C) 2006  Paul Mundt
 *
 * 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/io.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <mach/highlander.h>
#include <asm/push-switch.h>

static irqreturn_t psw_irq_handler(int irq, void *arg)
{
    struct platform_device *pdev = arg;
    struct push_switch *psw = platform_get_drvdata(pdev);
    struct push_switch_platform_info *psw_info = pdev->dev.platform_data;
    unsigned int l, mask;
    int ret = 0;

    l = __raw_readw(PA_DBSW);

    /* Nothing to do if there's no state change */
    if (psw->state) {
        ret = 1;
        goto out;
    }

    mask = l & 0x70;
    /* Figure out who raised it */
    if (mask & (1 << psw_info->bit)) {
        psw->state = !!(mask & (1 << psw_info->bit));
        if (psw->state) /* debounce */
            mod_timer(&psw->debounce, jiffies + 50);

        ret = 1;
    }

out:
    /* Clear the switch IRQs */
    l |= (0x7 << 12);
    __raw_writew(l, PA_DBSW);

    return IRQ_RETVAL(ret);
}

static struct resource psw_resources[] = {
    [0] = {
        .start  = IRQ_PSW,
        .flags  = IORESOURCE_IRQ,
    },
};

static struct push_switch_platform_info s2_platform_data = {
    .name       = "s2",
    .bit        = 6,
    .irq_flags  = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
              IRQF_SHARED,
    .irq_handler    = psw_irq_handler,
};

static struct platform_device s2_switch_device = {
    .name       = "push-switch",
    .id     = 0,
    .num_resources  = ARRAY_SIZE(psw_resources),
    .resource   = psw_resources,
    .dev        = {
        .platform_data = &s2_platform_data,
    },
};

static struct push_switch_platform_info s3_platform_data = {
    .name       = "s3",
    .bit        = 5,
    .irq_flags  = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
              IRQF_SHARED,
    .irq_handler    = psw_irq_handler,
};

static struct platform_device s3_switch_device = {
    .name       = "push-switch",
    .id     = 1,
    .num_resources  = ARRAY_SIZE(psw_resources),
    .resource   = psw_resources,
    .dev        = {
        .platform_data = &s3_platform_data,
    },
};

static struct push_switch_platform_info s4_platform_data = {
    .name       = "s4",
    .bit        = 4,
    .irq_flags  = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
              IRQF_SHARED,
    .irq_handler    = psw_irq_handler,
};

static struct platform_device s4_switch_device = {
    .name       = "push-switch",
    .id     = 2,
    .num_resources  = ARRAY_SIZE(psw_resources),
    .resource   = psw_resources,
    .dev        = {
        .platform_data = &s4_platform_data,
    },
};

static struct platform_device *psw_devices[] = {
    &s2_switch_device, &s3_switch_device, &s4_switch_device,
};

static int __init psw_init(void)
{
    return platform_add_devices(psw_devices, ARRAY_SIZE(psw_devices));
}
module_init(psw_init);