diff options
| author | Simon Glass | 2020-07-07 21:32:08 -0600 |
|---|---|---|
| committer | Bin Meng | 2020-07-17 14:32:24 +0800 |
| commit | b4e843341816395ef8a9d48793322617f9a50f9f (patch) | |
| tree | 5d100bfaadb5c083b1206974a0789a648fac83d4 /include | |
| parent | f18589576cb87e76c20046b335124a8af6feb6ac (diff) | |
dm: acpi: Add support for the NHLT table
The Intel Non-High-Definition-Audio Link Table (NHLT) table describes the
audio codecs and connections in a system. Various devices can contribute
information to produce the table.
Add core support for this, based on a structure which is built up through
calls to the driver.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/dm/acpi.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/include/dm/acpi.h b/include/dm/acpi.h index a58722de737..e8b0336f6d8 100644 --- a/include/dm/acpi.h +++ b/include/dm/acpi.h @@ -27,6 +27,8 @@ #if !defined(__ACPI__) +struct nhlt; + /** enum acpi_dump_option - selects what ACPI information to dump */ enum acpi_dump_option { ACPI_DUMP_LIST, /* Just the list of items */ @@ -44,6 +46,9 @@ enum acpi_dump_option { * adding a new table. The RSDP holds pointers to the RSDT and XSDT. * @rsdt: Pointer to the Root System Description Table * @xsdt: Pointer to the Extended System Description Table + * @nhlt: Intel Non-High-Definition-Audio Link Table (NHLT) pointer, used to + * build up information that audio codecs need to provide in the NHLT ACPI + * table * @len_stack: Stack of 'length' words to fix up later * @ltop: Points to current top of stack (0 = empty) */ @@ -53,6 +58,7 @@ struct acpi_ctx { struct acpi_rsdp *rsdp; struct acpi_rsdt *rsdt; struct acpi_xsdt *xsdt; + struct nhlt *nhlt; char *len_stack[ACPIGEN_LENSTACK_SIZE]; int ltop; }; @@ -113,6 +119,15 @@ struct acpi_ops { * @return 0 if OK, -ve on error */ int (*inject_dsdt)(const struct udevice *dev, struct acpi_ctx *ctx); + + /** + * setup_nhlt() - Set up audio information for this device + * + * The method can add information to ctx->nhlt if it likes + * + * @return 0 if OK, -ENODATA if nothing to add, -ve on error + */ + int (*setup_nhlt)(const struct udevice *dev, struct acpi_ctx *ctx); }; #define device_get_acpi_ops(dev) ((dev)->driver->acpi_ops) @@ -178,6 +193,17 @@ int acpi_fill_ssdt(struct acpi_ctx *ctx); int acpi_inject_dsdt(struct acpi_ctx *ctx); /** + * acpi_setup_nhlt() - Set up audio information + * + * This is called to set up the nhlt information for all devices. + * + * @ctx: ACPI context to use + * @nhlt: Pointer to nhlt information to add to + * @return 0 if OK, -ve on error + */ +int acpi_setup_nhlt(struct acpi_ctx *ctx, struct nhlt *nhlt); + +/** * acpi_dump_items() - Dump out the collected ACPI items * * This lists the ACPI DSDT and SSDT items generated by the various U-Boot |