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platform/x86: lg-laptop: Convert ACPI driver to a platform one

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In all cases in which a struct acpi_driver is used for binding a driver
to an ACPI device object, a corresponding platform device is created by
the ACPI core and that device is regarded as a proper representation of
underlying hardware.  Accordingly, a struct platform_driver should be
used by driver code to bind to that device.  There are multiple reasons
why drivers should not bind directly to ACPI device objects [1].

Overall, it is better to bind drivers to platform devices than to their
ACPI companions, so convert the LG Gram ACPI features and hotkeys driver
from an ACPI driver to a platform one.

While this is not expected to alter functionality, it changes sysfs
layout and so it will be visible to user space.

Link: https://lore.kernel.org/all/2396510.ElGaqSPkdT@rafael.j.wysocki/ [1]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://patch.msgid.link/1868365.VLH7GnMWUR@rafael.j.wysocki
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
This commit is contained in:
Rafael J. Wysocki 2026-03-12 12:14:47 +01:00 committed by Ilpo Järvinen
parent c12fe0b2c1
commit 2d9cb20610
No known key found for this signature in database
GPG Key ID: 59AC4F6153E5CE31
1 changed files with 13 additions and 32 deletions
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41
drivers/platform/x86/lg-laptop.c
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@ -759,8 +759,9 @@ static void lg_laptop_remove_address_space_handler(void *data)
&lg_laptop_address_space_handler); &lg_laptop_address_space_handler);
} }
static int acpi_add(struct acpi_device *device) static int acpi_probe(struct platform_device *pdev)
{ {
struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
struct platform_device_info pdev_info = { struct platform_device_info pdev_info = {
.fwnode = acpi_fwnode_handle(device), .fwnode = acpi_fwnode_handle(device),
.name = PLATFORM_NAME, .name = PLATFORM_NAME,
@ -776,11 +777,11 @@ static int acpi_add(struct acpi_device *device)
status = acpi_install_address_space_handler(device->handle, LG_ADDRESS_SPACE_ID, status = acpi_install_address_space_handler(device->handle, LG_ADDRESS_SPACE_ID,
&lg_laptop_address_space_handler, &lg_laptop_address_space_handler,
NULL, &device->dev); NULL, &pdev->dev);
if (ACPI_FAILURE(status)) if (ACPI_FAILURE(status))
return -ENODEV; return -ENODEV;
ret = devm_add_action_or_reset(&device->dev, lg_laptop_remove_address_space_handler, ret = devm_add_action_or_reset(&pdev->dev, lg_laptop_remove_address_space_handler,
device); device);
if (ret < 0) if (ret < 0)
return ret; return ret;
@ -874,7 +875,7 @@ static int acpi_add(struct acpi_device *device)
return ret; return ret;
} }
static void acpi_remove(struct acpi_device *device) static void acpi_remove(struct platform_device *pdev)
{ {
sysfs_remove_group(&pf_device->dev.kobj, &dev_attribute_group); sysfs_remove_group(&pf_device->dev.kobj, &dev_attribute_group);
@ -894,33 +895,13 @@ static const struct acpi_device_id device_ids[] = {
}; };
MODULE_DEVICE_TABLE(acpi, device_ids); MODULE_DEVICE_TABLE(acpi, device_ids);
static struct acpi_driver acpi_driver = { static struct platform_driver acpi_driver = {
.name = "LG Gram Laptop Support", .probe = acpi_probe,
.class = "lg-laptop",
.ids = device_ids,
.ops = {
.add = acpi_add,
.remove = acpi_remove, .remove = acpi_remove,
.driver = {
.name = "LG Gram Laptop Support",
.acpi_match_table = device_ids,
}, },
}; };
static int __init acpi_init(void) module_platform_driver(acpi_driver);
{
int result;
result = acpi_bus_register_driver(&acpi_driver);
if (result < 0) {
pr_debug("Error registering driver\n");
return -ENODEV;
}
return 0;
}
static void __exit acpi_exit(void)
{
acpi_bus_unregister_driver(&acpi_driver);
}
module_init(acpi_init);
module_exit(acpi_exit);