arch/sh/boards/landisk/psw.c

   1 /*
   2  * arch/sh/boards/landisk/psw.c
   3  *
   4  * push switch support for LANDISK and USL-5P
   5  *
   6  * Copyright (C) 2006-2007  Paul Mundt
   7  * Copyright (C) 2007  kogiidena
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License.  See the file "COPYING" in the main directory of this archive
  11  * for more details.
  12  */
  13 #include <linux/io.h>
  14 #include <linux/init.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/platform_device.h>
  17 #include <asm/landisk/iodata_landisk.h>
  18 #include <asm/push-switch.h>
  19
  20 static irqreturn_t psw_irq_handler(int irq, void *arg)
  21 {
  22         struct platform_device *pdev = arg;
  23         struct push_switch *psw = platform_get_drvdata(pdev);
  24         struct push_switch_platform_info *psw_info = pdev->dev.platform_data;
  25         unsigned int sw_value;
  26         int ret = 0;
  27
  28         sw_value = (0x0ff & (~ctrl_inb(PA_STATUS)));
  29
  30         /* Nothing to do if there's no state change */
  31         if (psw->state) {
  32                 ret = 1;
  33                 goto out;
  34         }
  35
  36         /* Figure out who raised it */
  37         if (sw_value & (1 << psw_info->bit)) {
  38                 psw->state = 1;
  39                 mod_timer(&psw->debounce, jiffies + 50);
  40                 ret = 1;
  41         }
  42
  43 out:
  44         /* Clear the switch IRQs */
  45         ctrl_outb(0x00, PA_PWRINT_CLR);
  46
  47         return IRQ_RETVAL(ret);
  48 }
  49
  50 static struct resource psw_power_resources[] = {
  51         [0] = {
  52                 .start = IRQ_POWER,
  53                 .flags = IORESOURCE_IRQ,
  54        },
  55 };
  56
  57 static struct resource psw_usl5p_resources[] = {
  58         [0] = {
  59                 .start = IRQ_BUTTON,
  60                 .flags = IORESOURCE_IRQ,
  61         },
  62 };
  63
  64 static struct push_switch_platform_info psw_power_platform_data = {
  65         .name           = "psw_power",
  66         .bit            = 4,
  67         .irq_flags      = IRQF_SHARED,
  68         .irq_handler    = psw_irq_handler,
  69 };
  70
  71 static struct push_switch_platform_info psw1_platform_data = {
  72         .name           = "psw1",
  73         .bit            = 0,
  74         .irq_flags      = IRQF_SHARED,
  75         .irq_handler    = psw_irq_handler,
  76 };
  77
  78 static struct push_switch_platform_info psw2_platform_data = {
  79         .name           = "psw2",
  80         .bit            = 2,
  81         .irq_flags      = IRQF_SHARED,
  82         .irq_handler    = psw_irq_handler,
  83 };
  84
  85 static struct push_switch_platform_info psw3_platform_data = {
  86         .name           = "psw3",
  87         .bit            = 1,
  88         .irq_flags      = IRQF_SHARED,
  89         .irq_handler    = psw_irq_handler,
  90 };
  91
  92 static struct platform_device psw_power_switch_device = {
  93         .name           = "push-switch",
  94         .id             = 0,
  95         .num_resources  = ARRAY_SIZE(psw_power_resources),
  96         .resource       = psw_power_resources,
  97         .dev            = {
  98                 .platform_data = &psw_power_platform_data,
  99         },
 100 };
 101
 102 static struct platform_device psw1_switch_device = {
 103         .name           = "push-switch",
 104         .id             = 1,
 105         .num_resources  = ARRAY_SIZE(psw_usl5p_resources),
 106         .resource       = psw_usl5p_resources,
 107         .dev            = {
 108                 .platform_data = &psw1_platform_data,
 109         },
 110 };
 111
 112 static struct platform_device psw2_switch_device = {
 113         .name           = "push-switch",
 114         .id             = 2,
 115         .num_resources  = ARRAY_SIZE(psw_usl5p_resources),
 116         .resource       = psw_usl5p_resources,
 117         .dev            = {
 118                 .platform_data = &psw2_platform_data,
 119         },
 120 };
 121
 122 static struct platform_device psw3_switch_device = {
 123         .name           = "push-switch",
 124         .id             = 3,
 125         .num_resources  = ARRAY_SIZE(psw_usl5p_resources),
 126         .resource       = psw_usl5p_resources,
 127         .dev = {
 128                 .platform_data = &psw3_platform_data,
 129         },
 130 };
 131
 132 static struct platform_device *psw_devices[] = {
 133         &psw_power_switch_device,
 134         &psw1_switch_device,
 135         &psw2_switch_device,
 136         &psw3_switch_device,
 137 };
 138
 139 static int __init psw_init(void)
 140 {
 141         return platform_add_devices(psw_devices, ARRAY_SIZE(psw_devices));
 142 }
 143 module_init(psw_init);