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Input: applespi - avoid efivars API and invoke EFI services directly 

This driver abuses the efivar API, by using a few of its helpers on
entries that were not instantiated by the API itself. This is a problem
as future cleanup work on efivars is complicated by this.

So let's just switch to the get/set variable runtime wrappers directly.

Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Ard Biesheuvel 2022-06-17 18:34:06 +02:00
parent c07d2475f9
commit f662092b2e
1 changed files with 14 additions and 28 deletions
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42
drivers/input/keyboard/applespi.c
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@ -1597,52 +1597,38 @@ static u32 applespi_notify(acpi_handle gpe_device, u32 gpe, void *context)
static int applespi_get_saved_bl_level(struct applespi_data *applespi)
{
struct efivar_entry *efivar_entry;
efi_status_t sts = EFI_NOT_FOUND;
u16 efi_data = 0;
unsigned long efi_data_len;
int sts;
unsigned long efi_data_len = sizeof(efi_data);
efivar_entry = kmalloc(sizeof(*efivar_entry), GFP_KERNEL);
if (!efivar_entry)
return -ENOMEM;
memcpy(efivar_entry->var.VariableName, EFI_BL_LEVEL_NAME,
sizeof(EFI_BL_LEVEL_NAME));
efivar_entry->var.VendorGuid = EFI_BL_LEVEL_GUID;
efi_data_len = sizeof(efi_data);
sts = efivar_entry_get(efivar_entry, NULL, &efi_data_len, &efi_data);
if (sts && sts != -ENOENT)
if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE))
sts = efi.get_variable(EFI_BL_LEVEL_NAME, &EFI_BL_LEVEL_GUID,
NULL, &efi_data_len, &efi_data);
if (sts != EFI_SUCCESS && sts != EFI_NOT_FOUND)
dev_warn(&applespi->spi->dev,
"Error getting backlight level from EFI vars: %d\n",
"Error getting backlight level from EFI vars: 0x%lx\n",
sts);
kfree(efivar_entry);
return sts ? sts : efi_data;
return sts != EFI_SUCCESS ? -ENODEV : efi_data;
}
static void applespi_save_bl_level(struct applespi_data *applespi,
unsigned int level)
{
efi_guid_t efi_guid;
efi_status_t sts = EFI_UNSUPPORTED;
u32 efi_attr;
unsigned long efi_data_len;
u16 efi_data;
int sts;
/* Save keyboard backlight level */
efi_guid = EFI_BL_LEVEL_GUID;
efi_data = (u16)level;
efi_data_len = sizeof(efi_data);
efi_attr = EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS;
sts = efivar_entry_set_safe((efi_char16_t *)EFI_BL_LEVEL_NAME, efi_guid,
efi_attr, true, efi_data_len, &efi_data);
if (sts)
if (efi_rt_services_supported(EFI_RT_SUPPORTED_SET_VARIABLE))
sts = efi.set_variable(EFI_BL_LEVEL_NAME, &EFI_BL_LEVEL_GUID,
efi_attr, sizeof(efi_data), &efi_data);
if (sts != EFI_SUCCESS)
dev_warn(&applespi->spi->dev,
"Error saving backlight level to EFI vars: %d\n", sts);
"Error saving backlight level to EFI vars: 0x%lx\n", sts);
}
static int applespi_probe(struct spi_device *spi)