diff options
Diffstat (limited to 'drivers/acpi/acpica/exfield.c')
| -rw-r--r-- | drivers/acpi/acpica/exfield.c | 93 |
1 files changed, 79 insertions, 14 deletions
diff --git a/drivers/acpi/acpica/exfield.c b/drivers/acpi/acpica/exfield.c index 12878e1982f..b994845ed35 100644 --- a/drivers/acpi/acpica/exfield.c +++ b/drivers/acpi/acpica/exfield.c @@ -56,7 +56,7 @@ acpi_ex_get_serial_access_length(u32 accessor_type, u32 access_length); /******************************************************************************* * - * FUNCTION: acpi_get_serial_access_bytes + * FUNCTION: acpi_ex_get_serial_access_length * * PARAMETERS: accessor_type - The type of the protocol indicated by region * field access attributes @@ -103,7 +103,7 @@ acpi_ex_get_serial_access_length(u32 accessor_type, u32 access_length) case AML_FIELD_ATTRIB_BLOCK_CALL: default: - length = ACPI_GSBUS_BUFFER_SIZE; + length = ACPI_GSBUS_BUFFER_SIZE - 2; break; } @@ -186,12 +186,11 @@ acpi_ex_read_data_from_field(struct acpi_walk_state * walk_state, access_length); /* - * Add additional 2 bytes for modeled generic_serial_bus data buffer: - * typedef struct { - * BYTEStatus; // Byte 0 of the data buffer - * BYTELength; // Byte 1 of the data buffer - * BYTE[x-1]Data; // Bytes 2-x of the arbitrary length data buffer, - * } + * Add additional 2 bytes for the generic_serial_bus data buffer: + * + * Status; (Byte 0 of the data buffer) + * Length; (Byte 1 of the data buffer) + * Data[x-1]; (Bytes 2-x of the arbitrary length data buffer) */ length += 2; function = ACPI_READ | (accessor_type << 16); @@ -254,6 +253,37 @@ acpi_ex_read_data_from_field(struct acpi_walk_state * walk_state, buffer = &buffer_desc->integer.value; } + if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) && + (obj_desc->field.region_obj->region.space_id == + ACPI_ADR_SPACE_GPIO)) { + /* + * For GPIO (general_purpose_io), the Address will be the bit offset + * from the previous Connection() operator, making it effectively a + * pin number index. The bit_length is the length of the field, which + * is thus the number of pins. + */ + ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, + "GPIO FieldRead [FROM]: Pin %u Bits %u\n", + obj_desc->field.pin_number_index, + obj_desc->field.bit_length)); + + /* Lock entire transaction if requested */ + + acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); + + /* Perform the write */ + + status = acpi_ex_access_region(obj_desc, 0, + (u64 *)buffer, ACPI_READ); + acpi_ex_release_global_lock(obj_desc->common_field.field_flags); + if (ACPI_FAILURE(status)) { + acpi_ut_remove_reference(buffer_desc); + } else { + *ret_buffer_desc = buffer_desc; + } + return_ACPI_STATUS(status); + } + ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, "FieldRead [TO]: Obj %p, Type %X, Buf %p, ByteLen %X\n", obj_desc, obj_desc->common.type, buffer, @@ -368,12 +398,11 @@ acpi_ex_write_data_to_field(union acpi_operand_object *source_desc, access_length); /* - * Add additional 2 bytes for modeled generic_serial_bus data buffer: - * typedef struct { - * BYTEStatus; // Byte 0 of the data buffer - * BYTELength; // Byte 1 of the data buffer - * BYTE[x-1]Data; // Bytes 2-x of the arbitrary length data buffer, - * } + * Add additional 2 bytes for the generic_serial_bus data buffer: + * + * Status; (Byte 0 of the data buffer) + * Length; (Byte 1 of the data buffer) + * Data[x-1]; (Bytes 2-x of the arbitrary length data buffer) */ length += 2; function = ACPI_WRITE | (accessor_type << 16); @@ -415,6 +444,42 @@ acpi_ex_write_data_to_field(union acpi_operand_object *source_desc, *result_desc = buffer_desc; return_ACPI_STATUS(status); + } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) && + (obj_desc->field.region_obj->region.space_id == + ACPI_ADR_SPACE_GPIO)) { + /* + * For GPIO (general_purpose_io), we will bypass the entire field + * mechanism and handoff the bit address and bit width directly to + * the handler. The Address will be the bit offset + * from the previous Connection() operator, making it effectively a + * pin number index. The bit_length is the length of the field, which + * is thus the number of pins. + */ + if (source_desc->common.type != ACPI_TYPE_INTEGER) { + return_ACPI_STATUS(AE_AML_OPERAND_TYPE); + } + + ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, + "GPIO FieldWrite [FROM]: (%s:%X), Val %.8X [TO]: Pin %u Bits %u\n", + acpi_ut_get_type_name(source_desc->common. + type), + source_desc->common.type, + (u32)source_desc->integer.value, + obj_desc->field.pin_number_index, + obj_desc->field.bit_length)); + + buffer = &source_desc->integer.value; + + /* Lock entire transaction if requested */ + + acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); + + /* Perform the write */ + + status = acpi_ex_access_region(obj_desc, 0, + (u64 *)buffer, ACPI_WRITE); + acpi_ex_release_global_lock(obj_desc->common_field.field_flags); + return_ACPI_STATUS(status); } /* Get a pointer to the data to be written */ |