// SPDX-License-Identifier: GPL-2.0 /* * arch/sh/boards/renesas/r7780rp/psw.c * * push switch support for RDBRP-1/RDBREVRP-1 debug boards. * * Copyright (C) 2006 Paul Mundt */ #include <linux/io.h> #include <linux/module.h> #include <linux/interrupt.h> #include <linux/platform_device.h> #include <mach/highlander.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 l, mask; int ret = 0; l = __raw_readw(PA_DBSW); /* Nothing to do if there's no state change */ if (psw->state) { ret = 1; goto out; } mask = l & 0x70; /* Figure out who raised it */ if (mask & (1 << psw_info->bit)) { psw->state = !!(mask & (1 << psw_info->bit)); if (psw->state) /* debounce */ mod_timer(&psw->debounce, jiffies + 50); ret = 1; } out: /* Clear the switch IRQs */ l |= (0x7 << 12); __raw_writew(l, PA_DBSW); return IRQ_RETVAL(ret); } static struct resource psw_resources[] = { [0] = { .start = IRQ_PSW, .flags = IORESOURCE_IRQ, }, }; static struct push_switch_platform_info s2_platform_data = { .name = "s2", .bit = 6, .irq_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_SHARED, .irq_handler = psw_irq_handler, }; static struct platform_device s2_switch_device = { .name = "push-switch", .id = 0, .num_resources = ARRAY_SIZE(psw_resources), .resource = psw_resources, .dev = { .platform_data = &s2_platform_data, }, }; static struct push_switch_platform_info s3_platform_data = { .name = "s3", .bit = 5, .irq_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_SHARED, .irq_handler = psw_irq_handler, }; static struct platform_device s3_switch_device = { .name = "push-switch", .id = 1, .num_resources = ARRAY_SIZE(psw_resources), .resource = psw_resources, .dev = { .platform_data = &s3_platform_data, }, }; static struct push_switch_platform_info s4_platform_data = { .name = "s4", .bit = 4, .irq_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_SHARED, .irq_handler = psw_irq_handler, }; static struct platform_device s4_switch_device = { .name = "push-switch", .id = 2, .num_resources = ARRAY_SIZE(psw_resources), .resource = psw_resources, .dev = { .platform_data = &s4_platform_data, }, }; static struct platform_device *psw_devices[] = { &s2_switch_device, &s3_switch_device, &s4_switch_device, }; static int __init psw_init(void) { return platform_add_devices(psw_devices, ARRAY_SIZE(psw_devices)); } module_init(psw_init);