The patch
ASoC: Intel: common: add ACPI package extraction utility
has been applied to the asoc tree at
git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git
All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted.
You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed.
If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced.
Please add any relevant lists and maintainers to the CCs when replying to this mail.
Thanks, Mark
From 3421894765a345c6919b22cdda606c2ba1aab2eb Mon Sep 17 00:00:00 2001
From: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Date: Sat, 12 Nov 2016 18:07:44 -0600 Subject: [PATCH] ASoC: Intel: common: add ACPI package extraction utility
Add a new common routine to extract a package exposed by a device indexed with the HID value. The functionality is implemented without assumptions on the package type or structure to allow for reuse. The caller is responsible for defining the name and allocating structures to store the results, ACPICA will complain in case of type mismatches or buffer size issues.
Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Signed-off-by: Mark Brown broonie@kernel.org --- sound/soc/intel/common/sst-acpi.h | 17 +++++++++- sound/soc/intel/common/sst-match-acpi.c | 57 +++++++++++++++++++++++++++++++++ 2 files changed, 73 insertions(+), 1 deletion(-)
diff --git a/sound/soc/intel/common/sst-acpi.h b/sound/soc/intel/common/sst-acpi.h index 012742299dd5..214e000667ae 100644 --- a/sound/soc/intel/common/sst-acpi.h +++ b/sound/soc/intel/common/sst-acpi.h @@ -15,14 +15,29 @@ #include <linux/stddef.h> #include <linux/acpi.h>
-/* translation fron HID to I2C name, needed for DAI codec_name */ +struct sst_acpi_package_context { + char *name; /* package name */ + int length; /* number of elements */ + struct acpi_buffer *format; + struct acpi_buffer *state; + bool data_valid; +}; + #if IS_ENABLED(CONFIG_ACPI) +/* translation fron HID to I2C name, needed for DAI codec_name */ const char *sst_acpi_find_name_from_hid(const u8 hid[ACPI_ID_LEN]); +bool sst_acpi_find_package_from_hid(const u8 hid[ACPI_ID_LEN], + struct sst_acpi_package_context *ctx); #else static inline const char *sst_acpi_find_name_from_hid(const u8 hid[ACPI_ID_LEN]) { return NULL; } +static inline bool sst_acpi_find_package_from_hid(const u8 hid[ACPI_ID_LEN], + struct sst_acpi_package_context *ctx) +{ + return false; +} #endif
/* acpi match */ diff --git a/sound/soc/intel/common/sst-match-acpi.c b/sound/soc/intel/common/sst-match-acpi.c index 789843307a49..1070f3ad23e5 100644 --- a/sound/soc/intel/common/sst-match-acpi.c +++ b/sound/soc/intel/common/sst-match-acpi.c @@ -77,5 +77,62 @@ struct sst_acpi_mach *sst_acpi_find_machine(struct sst_acpi_mach *machines) } EXPORT_SYMBOL_GPL(sst_acpi_find_machine);
+static acpi_status sst_acpi_find_package(acpi_handle handle, u32 level, + void *context, void **ret) +{ + struct acpi_device *adev; + acpi_status status = AE_OK; + struct sst_acpi_package_context *pkg_ctx = context; + + pkg_ctx->data_valid = false; + + if (acpi_bus_get_device(handle, &adev)) + return AE_OK; + + if (adev->status.present && adev->status.functional) { + struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; + union acpi_object *myobj = NULL; + + status = acpi_evaluate_object_typed(handle, pkg_ctx->name, + NULL, &buffer, + ACPI_TYPE_PACKAGE); + if (ACPI_FAILURE(status)) + return AE_OK; + + myobj = buffer.pointer; + if (!myobj || myobj->package.count != pkg_ctx->length) { + kfree(buffer.pointer); + return AE_OK; + } + + status = acpi_extract_package(myobj, + pkg_ctx->format, pkg_ctx->state); + if (ACPI_FAILURE(status)) { + kfree(buffer.pointer); + return AE_OK; + } + + kfree(buffer.pointer); + pkg_ctx->data_valid = true; + return AE_CTRL_TERMINATE; + } + + return AE_OK; +} + +bool sst_acpi_find_package_from_hid(const u8 hid[ACPI_ID_LEN], + struct sst_acpi_package_context *ctx) +{ + acpi_status status; + + status = acpi_get_devices(hid, sst_acpi_find_package, ctx, NULL); + + if (ACPI_FAILURE(status) || !ctx->data_valid) + return false; + + return true; +} +EXPORT_SYMBOL_GPL(sst_acpi_find_package_from_hid); + MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("Intel Common ACPI Match module");