psw.c

Go to the documentation of this file.

/*
 * arch/sh/boards/landisk/psw.c
 *
 * push switch support for LANDISK and USL-5P
 *
 * Copyright (C) 2006-2007  Paul Mundt
 * Copyright (C) 2007  kogiidena
 *
 * 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-landisk/mach/iodata_landisk.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 sw_value;
    int ret = 0;

    sw_value = (0x0ff & (~__raw_readb(PA_STATUS)));

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

    /* Figure out who raised it */
    if (sw_value & (1 << psw_info->bit)) {
        psw->state = 1;
        mod_timer(&psw->debounce, jiffies + 50);
        ret = 1;
    }

out:
    /* Clear the switch IRQs */
    __raw_writeb(0x00, PA_PWRINT_CLR);

    return IRQ_RETVAL(ret);
}

static struct resource psw_power_resources[] = {
    [0] = {
        .start = IRQ_POWER,
        .flags = IORESOURCE_IRQ,
       },
};

static struct resource psw_usl5p_resources[] = {
    [0] = {
        .start = IRQ_BUTTON,
        .flags = IORESOURCE_IRQ,
    },
};

static struct push_switch_platform_info psw_power_platform_data = {
    .name       = "psw_power",
    .bit        = 4,
    .irq_flags  = IRQF_SHARED,
    .irq_handler    = psw_irq_handler,
};

static struct push_switch_platform_info psw1_platform_data = {
    .name       = "psw1",
    .bit        = 0,
    .irq_flags  = IRQF_SHARED,
    .irq_handler    = psw_irq_handler,
};

static struct push_switch_platform_info psw2_platform_data = {
    .name       = "psw2",
    .bit        = 2,
    .irq_flags  = IRQF_SHARED,
    .irq_handler    = psw_irq_handler,
};

static struct push_switch_platform_info psw3_platform_data = {
    .name       = "psw3",
    .bit        = 1,
    .irq_flags  = IRQF_SHARED,
    .irq_handler    = psw_irq_handler,
};

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

static struct platform_device psw1_switch_device = {
    .name       = "push-switch",
    .id     = 1,
    .num_resources  = ARRAY_SIZE(psw_usl5p_resources),
    .resource   = psw_usl5p_resources,
    .dev        = {
        .platform_data = &psw1_platform_data,
    },
};

static struct platform_device psw2_switch_device = {
    .name       = "push-switch",
    .id     = 2,
    .num_resources  = ARRAY_SIZE(psw_usl5p_resources),
    .resource   = psw_usl5p_resources,
    .dev        = {
        .platform_data = &psw2_platform_data,
    },
};

static struct platform_device psw3_switch_device = {
    .name       = "push-switch",
    .id     = 3,
    .num_resources  = ARRAY_SIZE(psw_usl5p_resources),
    .resource   = psw_usl5p_resources,
    .dev = {
        .platform_data = &psw3_platform_data,
    },
};

static struct platform_device *psw_devices[] = {
    &psw_power_switch_device,
    &psw1_switch_device,
    &psw2_switch_device,
    &psw3_switch_device,
};

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