From 93f7f82782cb3d2bd55215ce984887efc6cddfed Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Sun, 26 Apr 2020 09:19:46 -0600 Subject: acpi: Add a method to write tables for a device A device may want to write out ACPI tables to describe itself to Linux. Add a method to permit this. Signed-off-by: Simon Glass Reviewed-by: Wolfgang Wallner --- include/acpi/acpi_table.h | 10 ++++++++++ include/dm/acpi.h | 30 ++++++++++++++++++++++++++++++ 2 files changed, 40 insertions(+) (limited to 'include') diff --git a/include/acpi/acpi_table.h b/include/acpi/acpi_table.h index 194be9aa589..a2bd929c920 100644 --- a/include/acpi/acpi_table.h +++ b/include/acpi/acpi_table.h @@ -505,6 +505,16 @@ int acpi_get_table_revision(enum acpi_tables table); */ int acpi_create_dmar(struct acpi_dmar *dmar, enum dmar_flags flags); +/** + * acpi_fill_header() - Set up a new table header + * + * This sets all fields except length, revision, checksum and aslc_revision + * + * @header: ACPI header to update + * @signature: Table signature to use (4 characters) + */ +void acpi_fill_header(struct acpi_table_header *header, char *signature); + #endif /* !__ACPI__*/ #include diff --git a/include/dm/acpi.h b/include/dm/acpi.h index 49257914ffd..69d69d7f423 100644 --- a/include/dm/acpi.h +++ b/include/dm/acpi.h @@ -24,6 +24,17 @@ #if !defined(__ACPI__) +/** + * struct acpi_ctx - Context used for writing ACPI tables + * + * This contains a few useful pieces of information used when writing + * + * @current: Current address for writing + */ +struct acpi_ctx { + void *current; +}; + /** * struct acpi_ops - ACPI operations supported by driver model */ @@ -38,6 +49,15 @@ struct acpi_ops { * other error */ int (*get_name)(const struct udevice *dev, char *out_name); + + /** + * write_tables() - Write out any tables required by this device + * + * @dev: Device to write + * @ctx: ACPI context to use + * @return 0 if OK, -ve on error + */ + int (*write_tables)(const struct udevice *dev, struct acpi_ctx *ctx); }; #define device_get_acpi_ops(dev) ((dev)->driver->acpi_ops) @@ -72,6 +92,16 @@ int acpi_get_name(const struct udevice *dev, char *out_name); */ int acpi_copy_name(char *out_name, const char *name); +/** + * acpi_write_dev_tables() - Write ACPI tables required by devices + * + * This scans through all devices and tells them to write any tables they want + * to write. + * + * @return 0 if OK, -ve if any device returned an error + */ +int acpi_write_dev_tables(struct acpi_ctx *ctx); + #endif /* __ACPI__ */ #endif -- cgit v1.2.3