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

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  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);
141 

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