On 3/2/2015 2:27 AM, 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. Also, certain classes of devices
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.
To support loadable module, current design uses _HID or _CID to match device's
modalias. With the new way of matching with _CLS this would requires modification
to the current ACPI modalias key to include _CLS. This patch appends PCI-defined
class-code to the existing ACPI modalias as following.
acpi:<HID>:<CID1>:<CID2>:..:<CIDn>:<bbsspp>:
E.g:
# cat /sys/devices/platform/AMDI0600:00/modalias
acpi:AMDI0600:010601:
where bb is th base-class code, ss is te sub-class code, and pp is the
programming interface code
Since there would not be _HID/_CID in the ACPI matching table of the driver,
this patch adds a field to acpi_device_id to specify the matching _CLS.
static const struct acpi_device_id ahci_acpi_match[] = {
{ "", 0, PCI_CLASS_STORAGE_SATA_AHCI },
{},
};
In this case, the corresponded entry in modules.alias file would be:
alias acpi*:010601:* ahci_platform
Signed-off-by: Suravee Suthikulpanit<Suravee.Suthikulpanit@xxxxxxx>
---
drivers/acpi/acpica/acutils.h | 3 ++
drivers/acpi/acpica/nsxfname.c | 20 +++++++++--
drivers/acpi/acpica/utids.c | 71 +++++++++++++++++++++++++++++++++++++++
drivers/acpi/scan.c | 17 ++++++++--
include/acpi/acnames.h | 1 +
include/acpi/actypes.h | 4 ++-
include/linux/mod_devicetable.h | 1 +
scripts/mod/devicetable-offsets.c | 1 +
scripts/mod/file2alias.c | 13 +++++--
9 files changed, 123 insertions(+), 8 deletions(-)
[....]
>
diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h
index b034f10..50d8019 100644
--- a/include/acpi/actypes.h
+++ b/include/acpi/actypes.h
@@ -1148,7 +1148,7 @@ struct acpi_device_info {
u32 name; /* ACPI object Name */
acpi_object_type type; /* ACPI object Type */
u8 param_count; /* If a method, required parameter count */
- u8 valid; /* Indicates which optional fields are valid */
+ u16 valid; /* Indicates which optional fields are valid */
u8 flags; /* Miscellaneous info */
u8 highest_dstates[4]; /* _sx_d values: 0xFF indicates not valid */
u8 lowest_dstates[5]; /* _sx_w values: 0xFF indicates not valid */
@@ -1158,6 +1158,7 @@ struct acpi_device_info {
struct acpi_pnp_device_id unique_id; /* _UID value */
struct acpi_pnp_device_id subsystem_id; /* _SUB value */
struct acpi_pnp_device_id_list compatible_id_list; /* _CID list <must be last> */
+ struct acpi_pnp_device_id cls; /* _CLS value */
};
Please disregard this patch. I found out a mistake on my part here. I
have sent out V5 here (https://lkml.org/lkml/2015/3/6/24)
Thank you,
Suravee
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