diff options
Diffstat (limited to 'drivers/net/wireless/intel/iwlwifi/fw/uefi.c')
| -rw-r--r-- | drivers/net/wireless/intel/iwlwifi/fw/uefi.c | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/drivers/net/wireless/intel/iwlwifi/fw/uefi.c b/drivers/net/wireless/intel/iwlwifi/fw/uefi.c index c875bf35533c..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, \ @@ -86,6 +87,7 @@ static void *iwl_uefi_reduce_power_section(struct iwl_trans *trans, if (len < tlv_len) { IWL_ERR(trans, "invalid TLV len: %zd/%u\n", len, tlv_len); + kfree(reduce_power_data); reduce_power_data = ERR_PTR(-EINVAL); goto out; } @@ -105,6 +107,7 @@ static void *iwl_uefi_reduce_power_section(struct iwl_trans *trans, IWL_DEBUG_FW(trans, "Couldn't allocate (more) reduce_power_data\n"); + kfree(reduce_power_data); reduce_power_data = ERR_PTR(-ENOMEM); goto out; } @@ -134,6 +137,10 @@ static void *iwl_uefi_reduce_power_section(struct iwl_trans *trans, done: if (!size) { IWL_DEBUG_FW(trans, "Empty REDUCE_POWER, skipping.\n"); + /* Better safe than sorry, but 'reduce_power_data' should + * always be NULL if !size. + */ + kfree(reduce_power_data); reduce_power_data = ERR_PTR(-ENOENT); goto out; } @@ -260,3 +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 */ |