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Message-Id: <20250317-plat2faux_dev-v1-8-5fe67c085ad5@arm.com>
Date: Mon, 17 Mar 2025 10:13:20 +0000
From: Sudeep Holla <sudeep.holla@....com>
To: linux-kernel@...r.kernel.org
Cc: Sudeep Holla <sudeep.holla@....com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Rafael J. Wysocki" <rafael@...nel.org>, Borislav Petkov <bp@...en8.de>,
linux-acpi@...r.kernel.org
Subject: [PATCH 8/9] ACPI: APEI: EINJ: Transition to the faux device
interface
The APEI error injection driver does not require the creation of a
platform device. Originally, this approach was chosen for simplicity
when the driver was first implemented.
With the introduction of the lightweight faux device interface, we now
have a more appropriate alternative. Migrate the driver to utilize the
faux bus, given that the platform device it previously created was not
a real one anyway. This will simplify the code, reducing its footprint
while maintaining functionality.
Cc: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: linux-acpi@...r.kernel.org
Signed-off-by: Sudeep Holla <sudeep.holla@....com>
---
drivers/acpi/apei/einj-core.c | 32 +++++++++++---------------------
1 file changed, 11 insertions(+), 21 deletions(-)
diff --git a/drivers/acpi/apei/einj-core.c b/drivers/acpi/apei/einj-core.c
index 04731a5b01faaba534bad853d0acc4c8a873a53b..7ff334422899e757de918107202507dd171d61da 100644
--- a/drivers/acpi/apei/einj-core.c
+++ b/drivers/acpi/apei/einj-core.c
@@ -21,7 +21,7 @@
#include <linux/nmi.h>
#include <linux/delay.h>
#include <linux/mm.h>
-#include <linux/platform_device.h>
+#include <linux/device/faux.h>
#include <linux/unaligned.h>
#include "apei-internal.h"
@@ -749,7 +749,7 @@ static int einj_check_table(struct acpi_table_einj *einj_tab)
return 0;
}
-static int __init einj_probe(struct platform_device *pdev)
+static int __init einj_probe(struct faux_device *fdev)
{
int rc;
acpi_status status;
@@ -851,7 +851,7 @@ static int __init einj_probe(struct platform_device *pdev)
return rc;
}
-static void __exit einj_remove(struct platform_device *pdev)
+static void __exit einj_remove(struct faux_device *fdev)
{
struct apei_exec_context ctx;
@@ -872,34 +872,25 @@ static void __exit einj_remove(struct platform_device *pdev)
acpi_put_table((struct acpi_table_header *)einj_tab);
}
-static struct platform_device *einj_dev;
+static struct faux_device *einj_dev;
/*
* einj_remove() lives in .exit.text. For drivers registered via
* platform_driver_probe() this is ok because they cannot get unbound at
* runtime. So mark the driver struct with __refdata to prevent modpost
* triggering a section mismatch warning.
*/
-static struct platform_driver einj_driver __refdata = {
+static struct faux_device_ops einj_device_ops __refdata = {
+ .probe = einj_probe,
.remove = __exit_p(einj_remove),
- .driver = {
- .name = "acpi-einj",
- },
};
static int __init einj_init(void)
{
- struct platform_device_info einj_dev_info = {
- .name = "acpi-einj",
- .id = -1,
- };
- int rc;
-
- einj_dev = platform_device_register_full(&einj_dev_info);
- if (IS_ERR(einj_dev))
- return PTR_ERR(einj_dev);
+ einj_dev = faux_device_create("acpi-einj", NULL, &einj_device_ops);
+ if (!einj_dev)
+ return -ENODEV;
- rc = platform_driver_probe(&einj_driver, einj_probe);
- einj_initialized = rc == 0;
+ einj_initialized = true;
return 0;
}
@@ -907,9 +898,8 @@ static int __init einj_init(void)
static void __exit einj_exit(void)
{
if (einj_initialized)
- platform_driver_unregister(&einj_driver);
+ faux_device_destroy(einj_dev);
- platform_device_unregister(einj_dev);
}
module_init(einj_init);
--
2.34.1
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