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path: root/drivers/acpi/ec.c
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Diffstat (limited to 'drivers/acpi/ec.c')
-rw-r--r--drivers/acpi/ec.c36
1 files changed, 10 insertions, 26 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 1ac28c6a672e..f2234db85da0 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -39,6 +39,7 @@
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/spinlock.h>
+#include <linux/slab.h>
#include <asm/io.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
@@ -628,12 +629,12 @@ 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 +642,15 @@ 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) {