Quelle  psw.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/*
 * arch/sh/boards/landisk/psw.c
 *
 * push switch support for LANDISK and USL-5P
 *
 * Copyright (C) 2006-2007  Paul Mundt
 * Copyright (C) 2007  kogiidena
 */
#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));
}
device_initcall(psw_init);