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path: root/drivers/net/wireless/intel/iwlwifi/fw/uefi.c
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Diffstat (limited to 'drivers/net/wireless/intel/iwlwifi/fw/uefi.c')
-rw-r--r--drivers/net/wireless/intel/iwlwifi/fw/uefi.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/drivers/net/wireless/intel/iwlwifi/fw/uefi.c b/drivers/net/wireless/intel/iwlwifi/fw/uefi.c
index 009dd4be597b..bd82c24811c8 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/uefi.c
+++ b/drivers/net/wireless/intel/iwlwifi/fw/uefi.c
@@ -11,6 +11,7 @@
#include "fw/uefi.h"
#include "fw/api/alive.h"
#include <linux/efi.h>
+#include "fw/runtime.h"
#define IWL_EFI_VAR_GUID EFI_GUID(0x92daaf2f, 0xc02b, 0x455b, \
0xb2, 0xec, 0xf5, 0xa3, \
@@ -266,3 +267,90 @@ out:
return data;
}
+
+#ifdef CONFIG_ACPI
+static int iwl_uefi_sgom_parse(struct uefi_cnv_wlan_sgom_data *sgom_data,
+ struct iwl_fw_runtime *fwrt)
+{
+ int i, j;
+
+ if (sgom_data->revision != 1)
+ return -EINVAL;
+
+ memcpy(fwrt->sgom_table.offset_map, sgom_data->offset_map,
+ sizeof(fwrt->sgom_table.offset_map));
+
+ for (i = 0; i < MCC_TO_SAR_OFFSET_TABLE_ROW_SIZE; i++) {
+ for (j = 0; j < MCC_TO_SAR_OFFSET_TABLE_COL_SIZE; j++) {
+ /* since each byte is composed of to values, */
+ /* one for each letter, */
+ /* extract and check each of them separately */
+ u8 value = fwrt->sgom_table.offset_map[i][j];
+ u8 low = value & 0xF;
+ u8 high = (value & 0xF0) >> 4;
+
+ if (high > fwrt->geo_num_profiles)
+ high = 0;
+ if (low > fwrt->geo_num_profiles)
+ low = 0;
+ fwrt->sgom_table.offset_map[i][j] = (high << 4) | low;
+ }
+ }
+
+ fwrt->sgom_enabled = true;
+ return 0;
+}
+
+void iwl_uefi_get_sgom_table(struct iwl_trans *trans,
+ struct iwl_fw_runtime *fwrt)
+{
+ struct efivar_entry *sgom_efivar;
+ struct uefi_cnv_wlan_sgom_data *data;
+ unsigned long package_size;
+ int err, ret;
+
+ if (!fwrt->geo_enabled)
+ return;
+
+ sgom_efivar = kzalloc(sizeof(*sgom_efivar), GFP_KERNEL);
+ if (!sgom_efivar)
+ return;
+
+ memcpy(&sgom_efivar->var.VariableName, IWL_UEFI_SGOM_NAME,
+ sizeof(IWL_UEFI_SGOM_NAME));
+ sgom_efivar->var.VendorGuid = IWL_EFI_VAR_GUID;
+
+ /* TODO: we hardcode a maximum length here, because reading
+ * from the UEFI is not working. To implement this properly,
+ * we have to call efivar_entry_size().
+ */
+ package_size = IWL_HARDCODED_SGOM_SIZE;
+
+ data = kmalloc(package_size, GFP_KERNEL);
+ if (!data) {
+ data = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+
+ err = efivar_entry_get(sgom_efivar, NULL, &package_size, data);
+ if (err) {
+ IWL_DEBUG_FW(trans,
+ "SGOM UEFI variable not found %d\n", err);
+ goto out_free;
+ }
+
+ IWL_DEBUG_FW(trans, "Read SGOM from UEFI with size %lu\n",
+ package_size);
+
+ ret = iwl_uefi_sgom_parse(data, fwrt);
+ if (ret < 0)
+ IWL_DEBUG_FW(trans, "Cannot read SGOM tables. rev is invalid\n");
+
+out_free:
+ kfree(data);
+
+out:
+ kfree(sgom_efivar);
+}
+IWL_EXPORT_SYMBOL(iwl_uefi_get_sgom_table);
+#endif /* CONFIG_ACPI */