From: Maciej Strozek mstrozek@opensource.cirrus.com
Use a device property "cirrus,firmware-uid" to get the unique firmware identifier instead of using ACPI _SUB.
There will not usually be a _SUB in Soundwire nodes. The ACPI can use a _DSD section for custom properties.
There is also a need to support instantiating this driver using software nodes. This is for systems where the CS35L56 is a back-end device and the ACPI refers only to the front-end audio device - there will not be any ACPI references to CS35L56.
Signed-off-by: Maciej Strozek mstrozek@opensource.cirrus.com Signed-off-by: Richard Fitzgerald rf@opensource.cirrus.com --- sound/soc/codecs/cs35l56.c | 31 ++++++++++++++----------------- 1 file changed, 14 insertions(+), 17 deletions(-)
diff --git a/sound/soc/codecs/cs35l56.c b/sound/soc/codecs/cs35l56.c index 3a9ec8724cc1..1f4cee097119 100644 --- a/sound/soc/codecs/cs35l56.c +++ b/sound/soc/codecs/cs35l56.c @@ -5,7 +5,6 @@ // Copyright (C) 2023 Cirrus Logic, Inc. and // Cirrus Logic International Semiconductor Ltd.
-#include <linux/acpi.h> #include <linux/completion.h> #include <linux/debugfs.h> #include <linux/delay.h> @@ -1029,26 +1028,24 @@ static int cs35l56_dsp_init(struct cs35l56_private *cs35l56) return 0; }
-static int cs35l56_acpi_get_name(struct cs35l56_private *cs35l56) +static int cs35l56_get_firmware_uid(struct cs35l56_private *cs35l56) { - acpi_handle handle = ACPI_HANDLE(cs35l56->base.dev); - const char *sub; + const char *prop; + int ret;
- /* If there is no ACPI_HANDLE, there is no ACPI for this system, return 0 */ - if (!handle) + ret = device_property_read_string(cs35l56->base.dev, "cirrus,firmware-uid", + &prop); + /* + * If bad sw node property, return 0 and fallback to legacy firmware path + */ + if (ret < 0) return 0;
- sub = acpi_get_subsystem_id(handle); - if (IS_ERR(sub)) { - /* If bad ACPI, return 0 and fallback to legacy firmware path, otherwise fail */ - if (PTR_ERR(sub) == -ENODATA) - return 0; - else - return PTR_ERR(sub); - } + cs35l56->dsp.system_name = kstrdup(prop, GFP_KERNEL); + if (cs35l56->dsp.system_name == NULL) + return -ENOMEM;
- cs35l56->dsp.system_name = sub; - dev_dbg(cs35l56->base.dev, "Subsystem ID: %s\n", cs35l56->dsp.system_name); + dev_dbg(cs35l56->base.dev, "Firmware UID: %s\n", cs35l56->dsp.system_name);
return 0; } @@ -1095,7 +1092,7 @@ int cs35l56_common_probe(struct cs35l56_private *cs35l56) gpiod_set_value_cansleep(cs35l56->base.reset_gpio, 1); }
- ret = cs35l56_acpi_get_name(cs35l56); + ret = cs35l56_get_firmware_uid(cs35l56); if (ret != 0) goto err;