diff options
Diffstat (limited to 'drivers/net/wireless/intel/iwlwifi/fw/acpi.c')
| -rw-r--r-- | drivers/net/wireless/intel/iwlwifi/fw/acpi.c | 175 |
1 files changed, 164 insertions, 11 deletions
diff --git a/drivers/net/wireless/intel/iwlwifi/fw/acpi.c b/drivers/net/wireless/intel/iwlwifi/fw/acpi.c index e3a33388be70..dc769b580431 100644 --- a/drivers/net/wireless/intel/iwlwifi/fw/acpi.c +++ b/drivers/net/wireless/intel/iwlwifi/fw/acpi.c @@ -58,44 +58,121 @@ * *****************************************************************************/ +#include <linux/uuid.h> #include "iwl-drv.h" #include "iwl-debug.h" #include "acpi.h" #include "fw/runtime.h" -void *iwl_acpi_get_object(struct device *dev, acpi_string method) +static const guid_t intel_wifi_guid = GUID_INIT(0xF21202BF, 0x8F78, 0x4DC6, + 0xA5, 0xB3, 0x1F, 0x73, + 0x8E, 0x28, 0x5A, 0xDE); + +static int iwl_acpi_get_handle(struct device *dev, acpi_string method, + acpi_handle *ret_handle) { acpi_handle root_handle; - acpi_handle handle; - struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL}; acpi_status status; root_handle = ACPI_HANDLE(dev); if (!root_handle) { IWL_DEBUG_DEV_RADIO(dev, - "Could not retrieve root port ACPI handle\n"); - return ERR_PTR(-ENOENT); + "ACPI: Could not retrieve root port handle\n"); + return -ENOENT; } - /* Get the method's handle */ - status = acpi_get_handle(root_handle, method, &handle); + status = acpi_get_handle(root_handle, method, ret_handle); if (ACPI_FAILURE(status)) { - IWL_DEBUG_DEV_RADIO(dev, "%s method not found\n", method); - return ERR_PTR(-ENOENT); + IWL_DEBUG_DEV_RADIO(dev, + "ACPI: %s method not found\n", method); + return -ENOENT; } + return 0; +} + +void *iwl_acpi_get_object(struct device *dev, acpi_string method) +{ + struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL}; + acpi_handle handle; + acpi_status status; + int ret; + + ret = iwl_acpi_get_handle(dev, method, &handle); + if (ret) + return ERR_PTR(-ENOENT); /* Call the method with no arguments */ status = acpi_evaluate_object(handle, NULL, NULL, &buf); if (ACPI_FAILURE(status)) { - IWL_DEBUG_DEV_RADIO(dev, "%s invocation failed (0x%x)\n", + IWL_DEBUG_DEV_RADIO(dev, + "ACPI: %s method invocation failed (status: 0x%x)\n", method, status); return ERR_PTR(-ENOENT); } - return buf.pointer; } IWL_EXPORT_SYMBOL(iwl_acpi_get_object); +/** +* Generic function for evaluating a method defined in the device specific +* method (DSM) interface. The returned acpi object must be freed by calling +* function. +*/ +void *iwl_acpi_get_dsm_object(struct device *dev, int rev, int func, + union acpi_object *args) +{ + union acpi_object *obj; + + obj = acpi_evaluate_dsm(ACPI_HANDLE(dev), &intel_wifi_guid, rev, func, + args); + if (!obj) { + IWL_DEBUG_DEV_RADIO(dev, + "ACPI: DSM method invocation failed (rev: %d, func:%d)\n", + rev, func); + return ERR_PTR(-ENOENT); + } + return obj; +} + +/** + * Evaluate a DSM with no arguments and a single u8 return value (inside a + * buffer object), verify and return that value. + */ +int iwl_acpi_get_dsm_u8(struct device *dev, int rev, int func) +{ + union acpi_object *obj; + int ret; + + obj = iwl_acpi_get_dsm_object(dev, rev, func, NULL); + if (IS_ERR(obj)) + return -ENOENT; + + if (obj->type != ACPI_TYPE_BUFFER) { + IWL_DEBUG_DEV_RADIO(dev, + "ACPI: DSM method did not return a valid object, type=%d\n", + obj->type); + ret = -EINVAL; + goto out; + } + + if (obj->buffer.length != sizeof(u8)) { + IWL_DEBUG_DEV_RADIO(dev, + "ACPI: DSM method returned invalid buffer, length=%d\n", + obj->buffer.length); + ret = -EINVAL; + goto out; + } + + ret = obj->buffer.pointer[0]; + IWL_DEBUG_DEV_RADIO(dev, + "ACPI: DSM method evaluated: func=%d, ret=%d\n", + func, ret); +out: + ACPI_FREE(obj); + return ret; +} +IWL_EXPORT_SYMBOL(iwl_acpi_get_dsm_u8); + union acpi_object *iwl_acpi_get_wifi_pkg(struct device *dev, union acpi_object *data, int data_size, int *tbl_rev) @@ -151,6 +228,82 @@ found: } IWL_EXPORT_SYMBOL(iwl_acpi_get_wifi_pkg); +int iwl_acpi_get_tas(struct iwl_fw_runtime *fwrt, + __le32 *black_list_array, + int *black_list_size) +{ + union acpi_object *wifi_pkg, *data; + int ret, tbl_rev, i; + bool enabled; + + data = iwl_acpi_get_object(fwrt->dev, ACPI_WTAS_METHOD); + if (IS_ERR(data)) + return PTR_ERR(data); + + wifi_pkg = iwl_acpi_get_wifi_pkg(fwrt->dev, data, + ACPI_WTAS_WIFI_DATA_SIZE, + &tbl_rev); + if (IS_ERR(wifi_pkg)) { + ret = PTR_ERR(wifi_pkg); + goto out_free; + } + + if (wifi_pkg->package.elements[0].type != ACPI_TYPE_INTEGER || + tbl_rev != 0) { + ret = -EINVAL; + goto out_free; + } + + enabled = !!wifi_pkg->package.elements[0].integer.value; + + if (!enabled) { + *black_list_size = -1; + IWL_DEBUG_RADIO(fwrt, "TAS not enabled\n"); + ret = 0; + goto out_free; + } + + if (wifi_pkg->package.elements[1].type != ACPI_TYPE_INTEGER || + wifi_pkg->package.elements[1].integer.value > + APCI_WTAS_BLACK_LIST_MAX) { + IWL_DEBUG_RADIO(fwrt, "TAS invalid array size %llu\n", + wifi_pkg->package.elements[1].integer.value); + ret = -EINVAL; + goto out_free; + } + *black_list_size = wifi_pkg->package.elements[1].integer.value; + + IWL_DEBUG_RADIO(fwrt, "TAS array size %d\n", *black_list_size); + if (*black_list_size > APCI_WTAS_BLACK_LIST_MAX) { + IWL_DEBUG_RADIO(fwrt, "TAS invalid array size value %u\n", + *black_list_size); + ret = -EINVAL; + goto out_free; + } + + for (i = 0; i < *black_list_size; i++) { + u32 country; + + if (wifi_pkg->package.elements[2 + i].type != + ACPI_TYPE_INTEGER) { + IWL_DEBUG_RADIO(fwrt, + "TAS invalid array elem %d\n", 2 + i); + ret = -EINVAL; + goto out_free; + } + + country = wifi_pkg->package.elements[2 + i].integer.value; + black_list_array[i] = cpu_to_le32(country); + IWL_DEBUG_RADIO(fwrt, "TAS black list country %d\n", country); + } + + ret = 0; +out_free: + kfree(data); + return ret; +} +IWL_EXPORT_SYMBOL(iwl_acpi_get_tas); + int iwl_acpi_get_mcc(struct device *dev, char *mcc) { union acpi_object *wifi_pkg, *data; |