diff options
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/Makefile | 1 | ||||
| -rw-r--r-- | drivers/acpi/acpi_platform.c | 285 | ||||
| -rw-r--r-- | drivers/acpi/internal.h | 7 | ||||
| -rw-r--r-- | drivers/acpi/scan.c | 16 |
4 files changed, 308 insertions, 1 deletions
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index 82422fe90f81..227c82bbe9a1 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -36,6 +36,7 @@ acpi-y += processor_core.o acpi-y += ec.o acpi-$(CONFIG_ACPI_DOCK) += dock.o acpi-y += pci_root.o pci_link.o pci_irq.o pci_bind.o +acpi-y += acpi_platform.o acpi-y += power.o acpi-y += event.o acpi-y += sysfs.o diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c new file mode 100644 index 000000000000..a5a23462287d --- /dev/null +++ b/drivers/acpi/acpi_platform.c @@ -0,0 +1,285 @@ +/* + * ACPI support for platform bus type. + * + * Copyright (C) 2012, Intel Corporation + * Authors: Mika Westerberg <mika.westerberg@linux.intel.com> + * Mathias Nyman <mathias.nyman@linux.intel.com> + * Rafael J. Wysocki <rafael.j.wysocki@intel.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/acpi.h> +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> + +ACPI_MODULE_NAME("platform"); + +struct resource_info { + struct device *dev; + struct resource *res; + size_t n, cur; +}; + +static acpi_status acpi_platform_count_resources(struct acpi_resource *res, + void *data) +{ + struct acpi_resource_extended_irq *acpi_xirq; + struct resource_info *ri = data; + + switch (res->type) { + case ACPI_RESOURCE_TYPE_FIXED_MEMORY32: + case ACPI_RESOURCE_TYPE_IRQ: + ri->n++; + break; + case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: + acpi_xirq = &res->data.extended_irq; + ri->n += acpi_xirq->interrupt_count; + break; + case ACPI_RESOURCE_TYPE_ADDRESS32: + if (res->data.address32.resource_type == ACPI_IO_RANGE) + ri->n++; + break; + } + + return AE_OK; +} + +static acpi_status acpi_platform_add_resources(struct acpi_resource *res, + void *data) +{ + struct acpi_resource_fixed_memory32 *acpi_mem; + struct acpi_resource_address32 *acpi_add32; + struct acpi_resource_extended_irq *acpi_xirq; + struct acpi_resource_irq *acpi_irq; + struct resource_info *ri = data; + struct resource *r; + int irq, i; + + switch (res->type) { + case ACPI_RESOURCE_TYPE_FIXED_MEMORY32: + acpi_mem = &res->data.fixed_memory32; + r = &ri->res[ri->cur++]; + + r->start = acpi_mem->address; + r->end = r->start + acpi_mem->address_length - 1; + r->flags = IORESOURCE_MEM; + + dev_dbg(ri->dev, "Memory32Fixed %pR\n", r); + break; + + case ACPI_RESOURCE_TYPE_ADDRESS32: + acpi_add32 = &res->data.address32; + + if (acpi_add32->resource_type == ACPI_IO_RANGE) { + r = &ri->res[ri->cur++]; + r->start = acpi_add32->minimum; + r->end = r->start + acpi_add32->address_length - 1; + r->flags = IORESOURCE_IO; + dev_dbg(ri->dev, "Address32 %pR\n", r); + } + break; + + case ACPI_RESOURCE_TYPE_IRQ: + acpi_irq = &res->data.irq; + r = &ri->res[ri->cur++]; + + irq = acpi_register_gsi(ri->dev, + acpi_irq->interrupts[0], + acpi_irq->triggering, + acpi_irq->polarity); + + r->start = r->end = irq; + r->flags = IORESOURCE_IRQ; + + dev_dbg(ri->dev, "IRQ %pR\n", r); + break; + + case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: + acpi_xirq = &res->data.extended_irq; + + for (i = 0; i < acpi_xirq->interrupt_count; i++, ri->cur++) { + r = &ri->res[ri->cur]; + irq = acpi_register_gsi(ri->dev, + acpi_xirq->interrupts[i], + acpi_xirq->triggering, + acpi_xirq->polarity); + + r->start = r->end = irq; + r->flags = IORESOURCE_IRQ; + + dev_dbg(ri->dev, "Interrupt %pR\n", r); + } + break; + } + + return AE_OK; +} + +static acpi_status acpi_platform_get_device_uid(struct acpi_device *adev, + int *uid) +{ + struct acpi_device_info *info; + acpi_status status; + + status = acpi_get_object_info(adev->handle, &info); + if (ACPI_FAILURE(status)) + return status; + + status = AE_NOT_EXIST; + if ((info->valid & ACPI_VALID_UID) && + !kstrtoint(info->unique_id.string, 0, uid)) + status = AE_OK; + + kfree(info); + return status; +} + +/** + * acpi_create_platform_device - Create platform device for ACPI device node + * @adev: ACPI device node to create a platform device for. + * + * Check if the given @adev can be represented as a platform device and, if + * that's the case, create and register a platform device, populate its common + * resources and returns a pointer to it. Otherwise, return %NULL. + * + * The platform device's name will be taken from the @adev's _HID and _UID. + */ +struct platform_device *acpi_create_platform_device(struct acpi_device *adev) +{ + struct platform_device *pdev = NULL; + struct acpi_device *acpi_parent; + struct device *parent = NULL; + struct resource_info ri; + acpi_status status; + int devid; + + /* If the ACPI node already has a physical device attached, skip it. */ + if (adev->physical_node_count) + return NULL; + + /* Use the UID of the device as the new platform device id if found. */ + status = acpi_platform_get_device_uid(adev, &devid); + if (ACPI_FAILURE(status)) + devid = -1; + + memset(&ri, 0, sizeof(ri)); + + /* First, count the resources. */ + status = acpi_walk_resources(adev->handle, METHOD_NAME__CRS, + acpi_platform_count_resources, &ri); + if (ACPI_FAILURE(status) || !ri.n) + return NULL; + + /* Next, allocate memory for all the resources and populate it. */ + ri.dev = &adev->dev; + ri.res = kzalloc(ri.n * sizeof(struct resource), GFP_KERNEL); + if (!ri.res) { + dev_err(&adev->dev, + "failed to allocate memory for resources\n"); + return NULL; + } + + status = acpi_walk_resources(adev->handle, METHOD_NAME__CRS, + acpi_platform_add_resources, &ri); + if (ACPI_FAILURE(status)) { + dev_err(&adev->dev, "failed to walk resources\n"); + goto out; + } + + if (WARN_ON(ri.n != ri.cur)) + goto out; + + /* + * If the ACPI node has a parent and that parent has a physical device + * attached to it, that physical device should be the parent of the + * platform device we are about to create. + */ + acpi_parent = adev->parent; + if (acpi_parent) { + struct acpi_device_physical_node *entry; + struct list_head *list; + + mutex_lock(&acpi_parent->physical_node_lock); + list = &acpi_parent->physical_node_list; + if (!list_empty(list)) { + entry = list_first_entry(list, + struct acpi_device_physical_node, + node); + parent = entry->dev; + } + mutex_unlock(&acpi_parent->physical_node_lock); + } + pdev = platform_device_register_resndata(parent, acpi_device_hid(adev), + devid, ri.res, ri.n, NULL, 0); + if (IS_ERR(pdev)) { + dev_err(&adev->dev, "platform device creation failed: %ld\n", + PTR_ERR(pdev)); + pdev = NULL; + } else { + dev_dbg(&adev->dev, "created platform device %s\n", + dev_name(&pdev->dev)); + } + + out: + kfree(ri.res); + return pdev; +} + +static acpi_status acpi_platform_match(acpi_handle handle, u32 depth, + void *data, void **return_value) +{ + struct platform_device *pdev = data; + struct acpi_device *adev; + acpi_status status; + + status = acpi_bus_get_device(handle, &adev); + if (ACPI_FAILURE(status)) + return status; + + /* Skip ACPI devices that have physical device attached */ + if (adev->physical_node_count) + return AE_OK; + + if (!strcmp(pdev->name, acpi_device_hid(adev))) { + int devid; + + /* Check that both name and UID match if it exists */ + status = acpi_platform_get_device_uid(adev, &devid); + if (ACPI_FAILURE(status)) + devid = -1; + + if (pdev->id != devid) + return AE_OK; + + *(acpi_handle *)return_value = handle; + return AE_CTRL_TERMINATE; + } + + return AE_OK; +} + +static int acpi_platform_find_device(struct device *dev, acpi_handle *handle) +{ + struct platform_device *pdev = to_platform_device(dev); + + *handle = NULL; + acpi_get_devices(pdev->name, acpi_platform_match, pdev, handle); + + return *handle ? 0 : -ENODEV; +} + +static struct acpi_bus_type acpi_platform_bus = { + .bus = &platform_bus_type, + .find_device = acpi_platform_find_device, +}; + +static int __init acpi_platform_init(void) +{ + return register_acpi_bus_type(&acpi_platform_bus); +} +arch_initcall(acpi_platform_init); diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h index ca75b9ce0489..57d41f6e1441 100644 --- a/drivers/acpi/internal.h +++ b/drivers/acpi/internal.h @@ -93,4 +93,11 @@ static inline int suspend_nvs_save(void) { return 0; } static inline void suspend_nvs_restore(void) {} #endif +/*-------------------------------------------------------------------------- + Platform bus support + -------------------------------------------------------------------------- */ +struct platform_device; + +struct platform_device *acpi_create_platform_device(struct acpi_device *adev); + #endif /* _ACPI_INTERNAL_H_ */ diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index a0dfdffe54d4..d842569395a9 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -29,6 +29,15 @@ extern struct acpi_device *acpi_root; static const char *dummy_hid = "device"; +/* + * The following ACPI IDs are known to be suitable for representing as + * platform devices. + */ +static const struct acpi_device_id acpi_platform_device_ids[] = { + + { } +}; + static LIST_HEAD(acpi_device_list); static LIST_HEAD(acpi_bus_id_list); DEFINE_MUTEX(acpi_device_lock); @@ -1513,8 +1522,13 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl, */ device = NULL; acpi_bus_get_device(handle, &device); - if (ops->acpi_op_add && !device) + if (ops->acpi_op_add && !device) { acpi_add_single_object(&device, handle, type, sta, ops); + /* Is the device a known good platform device? */ + if (device + && !acpi_match_device_ids(device, acpi_platform_device_ids)) + acpi_create_platform_device(device); + } if (!device) return AE_CTRL_DEPTH; |