From: Maciej Strozek <mstrozek@xxxxxxxxxxxxxxxxxxxxx>
Use a device property "cirrus,firmware-uid" to get the unique firmware
identifier instead of using ACPI _SUB. There aren't any products that use
_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.
Fixes: e49611252900 ("ASoC: cs35l56: Add driver for Cirrus Logic CS35L56")
Signed-off-by: Maciej Strozek <mstrozek@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Richard Fitzgerald <rf@xxxxxxxxxxxxxxxxxxxxx>
---
Changes since V1:
- Rebase to apply on v6.4 and v6.5
- Use devm_kstrdup() instead of kstrdup() and free()
To apply on v6.6 a 1-line change is needed:
static int cs35l56_get_firmware_uid(struct cs35l56_private *cs35l56)
{
- struct device *dev = cs35l56->dev;
+ struct device *dev = cs35l56->base.dev;
---
sound/soc/codecs/cs35l56.c | 31 ++++++++++++-------------------
1 file changed, 12 insertions(+), 19 deletions(-)
diff --git a/sound/soc/codecs/cs35l56.c b/sound/soc/codecs/cs35l56.c
index c03f9d3c9a13..fd06b9f9d496 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>
@@ -1354,26 +1353,22 @@ 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->dev);
- const char *sub;
+ struct device *dev = cs35l56->dev;
+ 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(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 = devm_kstrdup(dev, prop, GFP_KERNEL);
+ if (cs35l56->dsp.system_name == NULL)
+ return -ENOMEM;
- cs35l56->dsp.system_name = sub;
- dev_dbg(cs35l56->dev, "Subsystem ID: %s\n", cs35l56->dsp.system_name);
+ dev_dbg(dev, "Firmware UID: %s\n", cs35l56->dsp.system_name);
return 0;
}
@@ -1417,7 +1412,7 @@ int cs35l56_common_probe(struct cs35l56_private *cs35l56)
gpiod_set_value_cansleep(cs35l56->reset_gpio, 1);
}
- ret = cs35l56_acpi_get_name(cs35l56);
+ ret = cs35l56_get_firmware_uid(cs35l56);
if (ret != 0)
goto err;
@@ -1604,8 +1599,6 @@ void cs35l56_remove(struct cs35l56_private *cs35l56)
regcache_cache_only(cs35l56->regmap, true);
- kfree(cs35l56->dsp.system_name);
-
gpiod_set_value_cansleep(cs35l56->reset_gpio, 0);
regulator_bulk_disable(ARRAY_SIZE(cs35l56->supplies), cs35l56->supplies);
}
--
2.30.2
