1 // SPDX-License-Identifier: GPL-2.0
3 * arch/sh/boards/renesas/r7780rp/psw.c
5 * push switch support for RDBRP-1/RDBREVRP-1 debug boards.
7 * Copyright (C) 2006 Paul Mundt
10 #include <linux/module.h>
11 #include <linux/interrupt.h>
12 #include <linux/platform_device.h>
13 #include <mach/highlander.h>
14 #include <asm/push-switch.h>
16 static irqreturn_t psw_irq_handler(int irq, void *arg)
18 struct platform_device *pdev = arg;
19 struct push_switch *psw = platform_get_drvdata(pdev);
20 struct push_switch_platform_info *psw_info = pdev->dev.platform_data;
24 l = __raw_readw(PA_DBSW);
26 /* Nothing to do if there's no state change */
33 /* Figure out who raised it */
34 if (mask & (1 << psw_info->bit)) {
35 psw->state = !!(mask & (1 << psw_info->bit));
36 if (psw->state) /* debounce */
37 mod_timer(&psw->debounce, jiffies + 50);
43 /* Clear the switch IRQs */
45 __raw_writew(l, PA_DBSW);
47 return IRQ_RETVAL(ret);
50 static struct resource psw_resources[] = {
53 .flags = IORESOURCE_IRQ,
57 static struct push_switch_platform_info s2_platform_data = {
60 .irq_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
62 .irq_handler = psw_irq_handler,
65 static struct platform_device s2_switch_device = {
66 .name = "push-switch",
68 .num_resources = ARRAY_SIZE(psw_resources),
69 .resource = psw_resources,
71 .platform_data = &s2_platform_data,
75 static struct push_switch_platform_info s3_platform_data = {
78 .irq_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
80 .irq_handler = psw_irq_handler,
83 static struct platform_device s3_switch_device = {
84 .name = "push-switch",
86 .num_resources = ARRAY_SIZE(psw_resources),
87 .resource = psw_resources,
89 .platform_data = &s3_platform_data,
93 static struct push_switch_platform_info s4_platform_data = {
96 .irq_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
98 .irq_handler = psw_irq_handler,
101 static struct platform_device s4_switch_device = {
102 .name = "push-switch",
104 .num_resources = ARRAY_SIZE(psw_resources),
105 .resource = psw_resources,
107 .platform_data = &s4_platform_data,
111 static struct platform_device *psw_devices[] = {
112 &s2_switch_device, &s3_switch_device, &s4_switch_device,
115 static int __init psw_init(void)
117 return platform_add_devices(psw_devices, ARRAY_SIZE(psw_devices));
119 module_init(psw_init);