From: Sinan Kaya <okaya@codeaurora.org> To: linux-acpi@vger.kernel.org, timur@codeaurora.org, cov@codeaurora.org, jcm@redhat.com Cc: rjw@rjwysocki.net, agross@codeaurora.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Sinan Kaya <okaya@codeaurora.org>, linux-kernel@vger.kernel.org Subject: [PATCH] acpi: implement Generic Event Device Date: Mon, 25 Jan 2016 16:29:46 -0500 [thread overview] Message-ID: <1453757387-28154-1-git-send-email-okaya@codeaurora.org> (raw) 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@codeaurora.org> --- 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
WARNING: multiple messages have this Message-ID (diff)
From: okaya@codeaurora.org (Sinan Kaya) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH] acpi: implement Generic Event Device Date: Mon, 25 Jan 2016 16:29:46 -0500 [thread overview] Message-ID: <1453757387-28154-1-git-send-email-okaya@codeaurora.org> (raw) 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@codeaurora.org> --- 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
next prev reply other threads:[~2016-01-25 21:29 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-01-25 23:21 [PATCH] acpi: implement Generic Event Device kbuild test robot 2016-01-25 23:21 ` kbuild test robot 2016-01-25 23:21 ` kbuild test robot 2016-01-25 21:29 ` Sinan Kaya [this message] 2016-01-25 21:29 ` Sinan Kaya 2016-01-25 23:21 ` [PATCH] acpi: fix platform_no_drv_owner.cocci warnings kbuild test robot 2016-01-25 23:21 ` kbuild test robot 2016-01-25 23:21 ` kbuild test robot 2016-01-26 12:38 ` [PATCH] acpi: implement Generic Event Device Andy Shevchenko 2016-01-26 12:38 ` Andy Shevchenko 2016-01-26 13:49 ` Sinan Kaya 2016-01-26 13:49 ` Sinan Kaya
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