On 2014年12月20日 04:13, Suravee Suthikulpanit wrote:
Device drivers typically use ACPI _HIDs/_CIDs listed in struct device_driver acpi_match_table to match devices. However, for generic drivers, we do not want to list _HID for all supported devices, and some device classes do not have _CID (e.g. SATA, USB). Instead, we can leverage ACPI _CLS, which specifies PCI-defined class code (i.e. base-class, subclass and programming interface).
This patch adds support for matching ACPI devices using the _CLS method.
Signed-off-by: Suravee Suthikulpanit Suravee.Suthikulpanit@amd.com
drivers/acpi/scan.c | 63 +++++++++++++++++++++++++++++++++++++++++ include/acpi/acnames.h | 1 + include/linux/acpi.h | 12 +++++++- include/linux/device.h | 1 + include/linux/mod_devicetable.h | 6 ++++ 5 files changed, 82 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index d670158..6bf6f90 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -864,6 +864,69 @@ int acpi_match_device_ids(struct acpi_device *device, } EXPORT_SYMBOL(acpi_match_device_ids);
+/**
- acpi_match_device_cls - Match a struct device against a ACPI _CLS method
- @dev_cls: A pointer to struct acpi_device_cls object to match against.
- @dev: The ACPI device structure to match.
- Check if @dev has a valid ACPI and _CLS handle. If there is a
- struct acpi_device_cls object for that handle, use that object to match
- against the given struct acpi_device_cls object.
- Return 0 on success or error code on failure.
- */
+int acpi_match_device_cls(const struct acpi_device_cls *dev_cls,
const struct device *dev)+{
- int ret = -EINVAL;
- acpi_status status;
- union acpi_object *pkg;
- struct acpi_device_cls cls;
- struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
- struct acpi_buffer format = { sizeof("NNN"), "NNN" };
- struct acpi_buffer state = { 0, NULL };
- struct acpi_device *adev = ACPI_COMPANION(dev);
- acpi_handle handle = ACPI_HANDLE(dev);
- if (!handle || !adev || !adev->status.present || !dev_cls)
return ret;- status = acpi_evaluate_object(handle, METHOD_NAME__CLS, NULL, &buffer);
- if (ACPI_FAILURE(status))
return ret;- /**
* Note:* ACPIv5.1 defines the package to contain 3 integers for* Base-Class code, Sub-Class code, and Programming Interface code.*/- pkg = buffer.pointer;
- if (!pkg ||
(pkg->type != ACPI_TYPE_PACKAGE) ||(pkg->package.count != 3)) {dev_err(&adev->dev, "Invalid _CLS data\n");goto out;- }
- state.length = sizeof(struct acpi_device_cls);
- state.pointer = &cls;
- status = acpi_extract_package(pkg, &format, &state);
- if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Invalid data"));goto out;- }
- if ((dev_cls->base_class == cls.base_class) &&
(dev_cls->sub_class == cls.sub_class) &&(dev_cls->prog_interface == cls.prog_interface))ret = 0;+out:
- kfree(buffer.pointer);
- return ret;
+} +EXPORT_SYMBOL_GPL(acpi_match_device_cls);
- static void acpi_free_power_resources_lists(struct acpi_device *device) { int i;
diff --git a/include/acpi/acnames.h b/include/acpi/acnames.h index 7461327..22332a6 100644 --- a/include/acpi/acnames.h +++ b/include/acpi/acnames.h @@ -51,6 +51,7 @@ #define METHOD_NAME__BBN "_BBN" #define METHOD_NAME__CBA "_CBA" #define METHOD_NAME__CID "_CID" +#define METHOD_NAME__CLS "_CLS" #define METHOD_NAME__CRS "_CRS" #define METHOD_NAME__DDN "_DDN" #define METHOD_NAME__HID "_HID" diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 5a92d49..d377623 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -428,10 +428,14 @@ extern int acpi_nvs_for_each_region(int (*func)(__u64, __u64, void *), const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, const struct device *dev);
+int acpi_match_device_cls(const struct acpi_device_cls *dev_cls,
const struct device *dev);- static inline bool acpi_driver_match_device(struct device *dev, const struct device_driver *drv) {
- return !!acpi_match_device(drv->acpi_match_table, dev);
return (!!acpi_match_device(drv->acpi_match_table, dev) ||
!acpi_match_device_cls(drv->acpi_cls, dev));}
int acpi_device_uevent_modalias(struct device *, struct kobj_uevent_env *);
@@ -511,6 +515,12 @@ static inline const struct acpi_device_id *acpi_match_device( return NULL; }
+static inline int acpi_match_device_cls(const struct acpi_device_cls *dev_cls,
const struct device *dev)+{
- return -EINVAL;
+}
- static inline bool acpi_driver_match_device(struct device *dev, const struct device_driver *drv) {
diff --git a/include/linux/device.h b/include/linux/device.h index ce1f2160..a469adc 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -237,6 +237,7 @@ struct device_driver {
const struct of_device_id *of_match_table; const struct acpi_device_id *acpi_match_table;
- const struct acpi_device_cls *acpi_cls;
How about const struct acpi_device_cls *acpi_match_cls; ?
Other than that, Reviewed-by: Hanjun Guo hanjun.guo@linaro.org
Thanks Hanjun