[PATCH v2 0/2] Read _SUB from ACPI to be able to identify firmware
CS35L41 has a DSP which is able to run firmware, as well as a tuning file. Different systems may want to use different firmwares and tuning files, and some firmwares/tunings may not be compatible with other systems. To allow a system to select the correct fimware/tuning, we can read an _SUB from the ACPI. This _SUB can then be used to uniquely identify the system in the firmware/tuning file name.
Add a helper function which reads the _SUB, so this can be used by other parts in the future. Add support inside the CS35L41 ASoC driver to read this _SUB, and save it appropriately.
Changes since v1: - Add length validation for SSID String - Rename API - Allocate memory inside API - Use ACPI_HANDLE macro instead of ACPI_COMPANION - Improve error handling
Stefan Binding (2): ACPI: utils: Add api to read _SUB from ACPI ASoC: cs35l41: Read System Name from ACPI _SUB to identify firmware
drivers/acpi/utils.c | 38 ++++++++++++++++++++++++++++++++++++++ include/linux/acpi.h | 6 ++++++ sound/soc/codecs/cs35l41.c | 24 ++++++++++++++++++++++++ 3 files changed, 68 insertions(+)
Add a wrapper function to read the _SUB string from ACPI.
Signed-off-by: Stefan Binding sbinding@opensource.cirrus.com --- drivers/acpi/utils.c | 38 ++++++++++++++++++++++++++++++++++++++ include/linux/acpi.h | 6 ++++++ 2 files changed, 44 insertions(+)
diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c index 3a9773a09e19..4ef9ee4ad0d8 100644 --- a/drivers/acpi/utils.c +++ b/drivers/acpi/utils.c @@ -291,6 +291,44 @@ int acpi_get_local_address(acpi_handle handle, u32 *addr) } EXPORT_SYMBOL(acpi_get_local_address);
+#define ACPI_MAX_SUB_BUF_SIZE 9 + +const char *acpi_get_subsystem_id(acpi_handle handle) +{ + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + union acpi_object *obj; + acpi_status status; + const char *sub; + + status = acpi_evaluate_object(handle, METHOD_NAME__SUB, NULL, &buffer); + if (ACPI_FAILURE(status)) { + acpi_handle_debug(handle, "Reading ACPI _SUB failed: %#x\n", status); + return ERR_PTR(-ENODATA); + } + + obj = buffer.pointer; + if (obj->type == ACPI_TYPE_STRING) { + if (strlen(obj->string.pointer) < ACPI_MAX_SUB_BUF_SIZE && + strlen(obj->string.pointer) > 0) { + sub = kstrdup(obj->string.pointer, GFP_KERNEL); + if (!sub) + sub = ERR_PTR(-ENOMEM); + } else { + acpi_handle_err(handle, "ACPI _SUB Length %d is Invalid\n", + strlen(obj->string.pointer)); + sub = ERR_PTR(-EINVAL); + } + } else { + acpi_handle_warn(handle, "Warning ACPI _SUB did not return a string\n"); + sub = ERR_PTR(-EINVAL); + } + + acpi_os_free(buffer.pointer); + + return sub; +} +EXPORT_SYMBOL_GPL(acpi_get_subsystem_id); + acpi_status acpi_evaluate_reference(acpi_handle handle, acpi_string pathname, diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 4f82a5bc6d98..1c13fc077f42 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -762,6 +762,7 @@ static inline u64 acpi_arch_get_root_pointer(void) #endif
int acpi_get_local_address(acpi_handle handle, u32 *addr); +const char *acpi_get_subsystem_id(acpi_handle handle);
#else /* !CONFIG_ACPI */
@@ -1023,6 +1024,11 @@ static inline int acpi_get_local_address(acpi_handle handle, u32 *addr) return -ENODEV; }
+static inline const char *acpi_get_subsystem_id(acpi_handle handle); +{ + return ERR_PTR(-ENODEV); +} + static inline int acpi_register_wakeup_handler(int wake_irq, bool (*wakeup)(void *context), void *context) {
Hi Stefan,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on rafael-pm/linux-next] [also build test ERROR on broonie-sound/for-next linus/master v5.19-rc4 next-20220627] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch]
url: https://github.com/intel-lab-lkp/linux/commits/Stefan-Binding/Read-_SUB-from... base: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next config: um-x86_64_defconfig (https://download.01.org/0day-ci/archive/20220627/202206272354.ESTdiIXg-lkp@i...) compiler: gcc-11 (Debian 11.3.0-3) 11.3.0 reproduce (this is a W=1 build): # https://github.com/intel-lab-lkp/linux/commit/93ba13d4b3636b5cf2ff4d9185aa73... git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Stefan-Binding/Read-_SUB-from-ACPI-to-be-able-to-identify-firmware/20220627-221508 git checkout 93ba13d4b3636b5cf2ff4d9185aa73f059cc7b2a # save the config file mkdir build_dir && cp config build_dir/.config make W=1 O=build_dir ARCH=um SUBARCH=x86_64 SHELL=/bin/bash
If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot lkp@intel.com
All errors (new ones prefixed by >>):
In file included from init/main.c:30:
include/linux/acpi.h:1028:1: error: expected identifier or '(' before '{' token
1028 | { | ^ init/main.c:769:20: warning: no previous prototype for 'arch_post_acpi_subsys_init' [-Wmissing-prototypes] 769 | void __init __weak arch_post_acpi_subsys_init(void) { } | ^~~~~~~~~~~~~~~~~~~~~~~~~~ init/main.c:781:20: warning: no previous prototype for 'mem_encrypt_init' [-Wmissing-prototypes] 781 | void __init __weak mem_encrypt_init(void) { } | ^~~~~~~~~~~~~~~~ init/main.c:783:20: warning: no previous prototype for 'poking_init' [-Wmissing-prototypes] 783 | void __init __weak poking_init(void) { } | ^~~~~~~~~~~ In file included from init/main.c:30: include/linux/acpi.h:1027:27: warning: 'acpi_get_subsystem_id' declared 'static' but never defined [-Wunused-function] 1027 | static inline const char *acpi_get_subsystem_id(acpi_handle handle); | ^~~~~~~~~~~~~~~~~~~~~ -- In file included from kernel/sysctl.c:55:
include/linux/acpi.h:1028:1: error: expected identifier or '(' before '{' token
1028 | { | ^ include/linux/acpi.h:1027:27: warning: 'acpi_get_subsystem_id' declared 'static' but never defined [-Wunused-function] 1027 | static inline const char *acpi_get_subsystem_id(acpi_handle handle); | ^~~~~~~~~~~~~~~~~~~~~ -- In file included from include/linux/i2c.h:13, from drivers/input/mouse/synaptics.c:30:
include/linux/acpi.h:1028:1: error: expected identifier or '(' before '{' token
1028 | { | ^ include/linux/acpi.h:1027:27: warning: 'acpi_get_subsystem_id' declared 'static' but never defined [-Wunused-function] 1027 | static inline const char *acpi_get_subsystem_id(acpi_handle handle); | ^~~~~~~~~~~~~~~~~~~~~ drivers/input/mouse/synaptics.c:164:27: warning: 'smbus_pnp_ids' defined but not used [-Wunused-const-variable=] 164 | static const char * const smbus_pnp_ids[] = { | ^~~~~~~~~~~~~
vim +1028 include/linux/acpi.h
1026 1027 static inline const char *acpi_get_subsystem_id(acpi_handle handle);
1028 {
1029 return ERR_PTR(-ENODEV); 1030 } 1031
When loading firmware, wm_adsp uses a number of parameters to determine the path of the firmware and tuning files to load. One of these parameters is system_name. Add support in cs35l41 to read this system name from the ACPI _SUB ID in order to uniquely identify the firmware and tuning mapped to a particular system.
Signed-off-by: Stefan Binding sbinding@opensource.cirrus.com --- sound/soc/codecs/cs35l41.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+)
diff --git a/sound/soc/codecs/cs35l41.c b/sound/soc/codecs/cs35l41.c index 8766e19d85f1..9ab016094b32 100644 --- a/sound/soc/codecs/cs35l41.c +++ b/sound/soc/codecs/cs35l41.c @@ -6,6 +6,7 @@ // // Author: David Rhodes david.rhodes@cirrus.com
+#include <linux/acpi.h> #include <linux/delay.h> #include <linux/err.h> #include <linux/init.h> @@ -1142,6 +1143,24 @@ static int cs35l41_dsp_init(struct cs35l41_private *cs35l41) return ret; }
+static int cs35l41_probe_acpi(struct cs35l41_private *cs35l41) +{ + acpi_handle handle = ACPI_HANDLE(cs35l41->dev); + const char *sub; + + /* If there is no ACPI_HANDLE, there is no ACPI for this system, return 0 */ + if (!handle) + return 0; + + sub = acpi_get_subsystem_id(handle); + if (IS_ERR(sub)) + return PTR_ERR(sub); + + cs35l41->dsp.system_name = sub; + dev_dbg(cs35l41->dev, "Susystem ID: %s\n", cs35l41->dsp.system_name); + return 0; +} + int cs35l41_probe(struct cs35l41_private *cs35l41, const struct cs35l41_hw_cfg *hw_cfg) { u32 regid, reg_revid, i, mtl_revid, int_status, chipid_match; @@ -1270,6 +1289,10 @@ int cs35l41_probe(struct cs35l41_private *cs35l41, const struct cs35l41_hw_cfg * goto err; }
+ ret = cs35l41_probe_acpi(cs35l41); + if (ret < 0) + goto err; + ret = cs35l41_dsp_init(cs35l41); if (ret < 0) goto err; @@ -1316,6 +1339,7 @@ void cs35l41_remove(struct cs35l41_private *cs35l41) pm_runtime_disable(cs35l41->dev);
regmap_write(cs35l41->regmap, CS35L41_IRQ1_MASK1, 0xFFFFFFFF); + kfree(cs35l41->dsp.system_name); wm_adsp2_remove(&cs35l41->dsp); cs35l41_safe_reset(cs35l41->regmap, cs35l41->hw_cfg.bst_type);
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kernel test robot -
Stefan Binding