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Commit dadf28a1 authored by Alexey Starikovskiy's avatar Alexey Starikovskiy Committed by Len Brown
Browse files

ACPI: EC: Allow multibyte access to EC 

http://bugzilla.kernel.org/show_bug.cgi?id=14667



Signed-off-by: default avatarAlexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent a3d3203e

drivers/acpi/acpica/exprep.c

+12 −0
Original line number Diff line number Diff line
@@ -468,6 +468,18 @@ acpi_status acpi_ex_prep_field_value(struct acpi_create_field_info *info) 


		acpi_ut_add_reference(obj_desc->field.region_obj);



		/* allow full data read from EC address space */

		if (obj_desc->field.region_obj->region.space_id ==

			ACPI_ADR_SPACE_EC) {

			if (obj_desc->common_field.bit_length > 8)

				obj_desc->common_field.access_bit_width =

				ACPI_ROUND_UP(obj_desc->common_field.

							bit_length, 8);

				obj_desc->common_field.access_byte_width =

				ACPI_DIV_8(obj_desc->common_field.

							access_bit_width);

		}



		ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,

				  "RegionField: BitOff %X, Off %X, Gran %X, Region %p\n",

				  obj_desc->field.start_field_bit_offset,

drivers/acpi/ec.c

+9 −26
Original line number Diff line number Diff line
@@ -628,12 +628,12 @@ static u32 acpi_ec_gpe_handler(void *data) 


static acpi_status

acpi_ec_space_handler(u32 function, acpi_physical_address address,

		      u32 bits, u64 *value,

		      u32 bits, u64 *value64,

		      void *handler_context, void *region_context)

{

	struct acpi_ec *ec = handler_context;

	int result = 0, i;

	u8 temp = 0;

	int result = 0, i, bytes = bits / 8;

	u8 *value = (u8 *)value64;



	if ((address > 0xFF) || !value || !handler_context)

		return AE_BAD_PARAMETER;
@@ -641,32 +641,15 @@ acpi_ec_space_handler(u32 function, acpi_physical_address address, 
	if (function != ACPI_READ && function != ACPI_WRITE)

		return AE_BAD_PARAMETER;



	if (bits != 8 && acpi_strict)

		return AE_BAD_PARAMETER;



	if (EC_FLAGS_MSI)

	if (EC_FLAGS_MSI || bits > 8)

		acpi_ec_burst_enable(ec);



	if (function == ACPI_READ) {

		result = acpi_ec_read(ec, address, &temp);

		*value = temp;

	} else {

		temp = 0xff & (*value);

		result = acpi_ec_write(ec, address, temp);

	}



	for (i = 8; unlikely(bits - i > 0); i += 8) {

		++address;

		if (function == ACPI_READ) {

			result = acpi_ec_read(ec, address, &temp);

			(*value) |= ((u64)temp) << i;

		} else {

			temp = 0xff & ((*value) >> i);

			result = acpi_ec_write(ec, address, temp);

		}

	}

	for (i = 0; i < bytes; ++i, ++address, ++value)

		result = (function == ACPI_READ) ?

			acpi_ec_read(ec, address, value) :

			acpi_ec_write(ec, address, *value);



	if (EC_FLAGS_MSI)

	if (EC_FLAGS_MSI || bits > 8)

		acpi_ec_burst_disable(ec);



	switch (result) {