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 ---
(no changes since v1)
drivers/core/acpi.c | 15 +++++++++++++++ include/dm/acpi.h | 26 ++++++++++++++++++++++++++ 2 files changed, 41 insertions(+)
diff --git a/drivers/core/acpi.c b/drivers/core/acpi.c index ae69258562..cdbc2c5cf5 100644 --- a/drivers/core/acpi.c +++ b/drivers/core/acpi.c @@ -31,6 +31,7 @@ enum method_t { METHOD_WRITE_TABLES, METHOD_FILL_SSDT, METHOD_INJECT_DSDT, + METHOD_SETUP_NHLT, };
/* Prototype for all methods */ @@ -248,6 +249,8 @@ acpi_method acpi_get_method(struct udevice *dev, enum method_t method) return aops->fill_ssdt; case METHOD_INJECT_DSDT: return aops->inject_dsdt; + case METHOD_SETUP_NHLT: + return aops->setup_nhlt; } }
@@ -334,3 +337,15 @@ int acpi_write_dev_tables(struct acpi_ctx *ctx)
return ret; } + +int acpi_setup_nhlt(struct acpi_ctx *ctx, struct nhlt *nhlt) +{ + int ret; + + log_debug("Setup NHLT\n"); + ctx->nhlt = nhlt; + ret = acpi_recurse_method(ctx, dm_root(), METHOD_SETUP_NHLT, TYPE_NONE); + log_debug("Setup finished, err=%d\n", ret); + + return ret; +} diff --git a/include/dm/acpi.h b/include/dm/acpi.h index d8d2eb6130..be61620687 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) @@ -177,6 +192,17 @@ 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 *