arch/sh/boards/mach-landisk/psw.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * arch/sh/boards/landisk/psw.c
   4  *
   5  * push switch support for LANDISK and USL-5P
   6  *
   7  * Copyright (C) 2006-2007  Paul Mundt
   8  * Copyright (C) 2007  kogiidena
   9  */
  10 #include <linux/io.h>
  11 #include <linux/init.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/platform_device.h>
  14 #include <mach-landisk/mach/iodata_landisk.h>
  15 #include <asm/push-switch.h>
  16
  17 static irqreturn_t psw_irq_handler(int irq, void *arg)
  18 {
  19         struct platform_device *pdev = arg;
  20         struct push_switch *psw = platform_get_drvdata(pdev);
  21         struct push_switch_platform_info *psw_info = pdev->dev.platform_data;
  22         unsigned int sw_value;
  23         int ret = 0;
  24
  25         sw_value = (0x0ff & (~__raw_readb(PA_STATUS)));
  26
  27         /* Nothing to do if there's no state change */
  28         if (psw->state) {
  29                 ret = 1;
  30                 goto out;
  31         }
  32
  33         /* Figure out who raised it */
  34         if (sw_value & (1 << psw_info->bit)) {
  35                 psw->state = 1;
  36                 mod_timer(&psw->debounce, jiffies + 50);
  37                 ret = 1;
  38         }
  39
  40 out:
  41         /* Clear the switch IRQs */
  42         __raw_writeb(0x00, PA_PWRINT_CLR);
  43
  44         return IRQ_RETVAL(ret);
  45 }
  46
  47 static struct resource psw_power_resources[] = {
  48         [0] = {
  49                 .start = IRQ_POWER,
  50                 .flags = IORESOURCE_IRQ,
  51        },
  52 };
  53
  54 static struct resource psw_usl5p_resources[] = {
  55         [0] = {
  56                 .start = IRQ_BUTTON,
  57                 .flags = IORESOURCE_IRQ,
  58         },
  59 };
  60
  61 static struct push_switch_platform_info psw_power_platform_data = {
  62         .name           = "psw_power",
  63         .bit            = 4,
  64         .irq_flags      = IRQF_SHARED,
  65         .irq_handler    = psw_irq_handler,
  66 };
  67
  68 static struct push_switch_platform_info psw1_platform_data = {
  69         .name           = "psw1",
  70         .bit            = 0,
  71         .irq_flags      = IRQF_SHARED,
  72         .irq_handler    = psw_irq_handler,
  73 };
  74
  75 static struct push_switch_platform_info psw2_platform_data = {
  76         .name           = "psw2",
  77         .bit            = 2,
  78         .irq_flags      = IRQF_SHARED,
  79         .irq_handler    = psw_irq_handler,
  80 };
  81
  82 static struct push_switch_platform_info psw3_platform_data = {
  83         .name           = "psw3",
  84         .bit            = 1,
  85         .irq_flags      = IRQF_SHARED,
  86         .irq_handler    = psw_irq_handler,
  87 };
  88
  89 static struct platform_device psw_power_switch_device = {
  90         .name           = "push-switch",
  91         .id             = 0,
  92         .num_resources  = ARRAY_SIZE(psw_power_resources),
  93         .resource       = psw_power_resources,
  94         .dev            = {
  95                 .platform_data = &psw_power_platform_data,
  96         },
  97 };
  98
  99 static struct platform_device psw1_switch_device = {
 100         .name           = "push-switch",
 101         .id             = 1,
 102         .num_resources  = ARRAY_SIZE(psw_usl5p_resources),
 103         .resource       = psw_usl5p_resources,
 104         .dev            = {
 105                 .platform_data = &psw1_platform_data,
 106         },
 107 };
 108
 109 static struct platform_device psw2_switch_device = {
 110         .name           = "push-switch",
 111         .id             = 2,
 112         .num_resources  = ARRAY_SIZE(psw_usl5p_resources),
 113         .resource       = psw_usl5p_resources,
 114         .dev            = {
 115                 .platform_data = &psw2_platform_data,
 116         },
 117 };
 118
 119 static struct platform_device psw3_switch_device = {
 120         .name           = "push-switch",
 121         .id             = 3,
 122         .num_resources  = ARRAY_SIZE(psw_usl5p_resources),
 123         .resource       = psw_usl5p_resources,
 124         .dev = {
 125                 .platform_data = &psw3_platform_data,
 126         },
 127 };
 128
 129 static struct platform_device *psw_devices[] = {
 130         &psw_power_switch_device,
 131         &psw1_switch_device,
 132         &psw2_switch_device,
 133         &psw3_switch_device,
 134 };
 135
 136 static int __init psw_init(void)
 137 {
 138         return platform_add_devices(psw_devices, ARRAY_SIZE(psw_devices));
 139 }
 140 device_initcall(psw_init);