Generic Event Device described in ACPI 6.1 allows platforms to handle
platform interrupts in ACPI ASL statements. It borrows constructs like
_EVT from GPIO events. All interrupts are listed in _CRS and the handler
is written in _EVT method. Here is an example.
Device (GED0)
{
Name (_HID, "ACPI0013")
Name (_UID, 0)
Name(_CRS, ResourceTemplate ()
{
Interrupt(ResourceConsumer, Edge, ActiveHigh, Shared, , , )
{123}
})
Method (_EVT, 1) {
if (Lequal(123, Arg0))
{
}
}
}
Wake capability has not been implemented yet.
Signed-off-by: Sinan Kaya <okaya@xxxxxxxxxxxxxx>
---
drivers/acpi/Makefile | 1 +
drivers/acpi/evged.c | 162 ++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 163 insertions(+)
create mode 100644 drivers/acpi/evged.c
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index b5e7cd8..4dbb732 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -46,6 +46,7 @@ acpi-y += acpi_pnp.o
acpi-y += int340x_thermal.o
acpi-y += power.o
acpi-y += event.o
+acpi-$(CONFIG_ACPI_REDUCED_HARDWARE_ONLY) += evged.o
acpi-y += sysfs.o
acpi-y += property.o
acpi-$(CONFIG_X86) += acpi_cmos_rtc.o
diff --git a/drivers/acpi/evged.c b/drivers/acpi/evged.c
new file mode 100644
index 0000000..a904676
--- /dev/null
+++ b/drivers/acpi/evged.c
@@ -0,0 +1,162 @@
+/*
+ * Generic Event Device for ACPI.
+ *
+ * Copyright (c) 2016, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * Generic Event Device allows platforms to handle
+ * interrupts in ACPI ASL statements. It follows very similar
+ * _EVT method approach from GPIO events.
+ * All interrupts are listed in _CRS and the handler
+ * is written in _EVT method. Here is an example.
+ *
+ * Device (GED0)
+ * {
+ *
+ * Name (_HID, "ACPI0013")
+ * Name (_UID, 0)
+ * Method (_CRS, 0x0, Serialized)
+ * {
+ * Name (RBUF, ResourceTemplate ()
+ * {
+ * Interrupt(ResourceConsumer, Edge, ActiveHigh, Shared, , , )
+ * {123}
+ * }
+ * })
+ *
+ * Method (_EVT, 1) {
+ * if (Lequal(123, Arg0))
+ * {
+ * }
+ * }
+ * }
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/platform_device.h>
+#include <linux/acpi.h>
+
+#define MODULE_NAME "acpi-ged"
+
+struct acpi_ged_event {
+ struct list_head node;
+ struct device *dev;
+ unsigned int gsi;
+ unsigned int irq;
+ acpi_handle handle;
+};
+
+static irqreturn_t acpi_ged_irq_handler(int irq, void *data)
+{
+ struct acpi_ged_event *event = data;
+ acpi_status acpi_ret;
+
+ acpi_ret = acpi_execute_simple_method(event->handle, NULL, event->gsi);
+ if (ACPI_FAILURE(acpi_ret))
+ dev_err_once(event->dev, "IRQ method execution failed\n");
+
+ return IRQ_HANDLED;
+}
+
+static acpi_status acpi_ged_request_interrupt(struct acpi_resource *ares,
+ void *context)
+{
+ struct acpi_ged_event *event;
+ unsigned int irq;
+ unsigned int gsi;
+ unsigned int irqflags = IRQF_ONESHOT;
+ struct device *dev = context;
+ acpi_handle handle = ACPI_HANDLE(dev);
+ acpi_handle evt_handle;
+ struct resource r;
+ struct acpi_resource_irq *p = &ares->data.irq;
+ struct acpi_resource_extended_irq *pext = &ares->data.extended_irq;
+
+ if (ares->type == ACPI_RESOURCE_TYPE_END_TAG)
+ return AE_OK;
+
+ if (!acpi_dev_resource_interrupt(ares, 0, &r)) {
+ dev_err(dev, "unable to parse IRQ resource\n");
+ return AE_ERROR;
+ }
+ if (ares->type == ACPI_RESOURCE_TYPE_IRQ)
+ gsi = p->interrupts[0];
+ else
+ gsi = pext->interrupts[0];
+
+ irq = r.start;
+
+ if (ACPI_FAILURE(acpi_get_handle(handle, "_EVT", &evt_handle))) {
+ dev_err(dev, "cannot locate _EVT method\n");
+ return AE_ERROR;
+ }
+
+ dev_info(dev, "GED listening GSI %u @ IRQ %u\n", gsi, irq);
+
+ event = devm_kzalloc(dev, sizeof(*event), GFP_KERNEL);
+ if (!event)
+ return AE_ERROR;
+
+ event->gsi = gsi;
+ event->dev = dev;
+ event->irq = irq;
+ event->handle = evt_handle;
+
+ if (r.flags & IORESOURCE_IRQ_SHAREABLE)
+ irqflags |= IRQF_SHARED;
+
+ if (devm_request_threaded_irq(dev, irq, NULL, acpi_ged_irq_handler,
+ irqflags, "ACPI:Ged", event)) {
+ dev_err(dev, "failed to setup event handler for irq %u\n", irq);
+ return AE_ERROR;
+ }
+
+ return AE_OK;
+}
+
+static int ged_probe(struct platform_device *pdev)
+{
+ acpi_status acpi_ret;
+
+ acpi_ret = acpi_walk_resources(ACPI_HANDLE(&pdev->dev), "_CRS",
+ acpi_ged_request_interrupt, &pdev->dev);
+ if (ACPI_FAILURE(acpi_ret)) {
+ dev_err(&pdev->dev, "unable to parse the _CRS record\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct acpi_device_id ged_acpi_ids[] = {
+ {"ACPI0013"},
+ {},
+};
+
+static struct platform_driver ged_driver = {
+ .probe = ged_probe,
+ .driver = {
+ .name = MODULE_NAME,
+ .owner = THIS_MODULE,
+ .acpi_match_table = ACPI_PTR(ged_acpi_ids),
+ },
+};
+
+static int __init ged_init(void)
+{
+ return platform_driver_register(&ged_driver);
+}
+
+subsys_initcall(ged_init);
--
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
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