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Date: Fri, 04 Apr 2008 13:28:40 +0100
From: "Jan Beulich" <jbeulich@...ell.com>
To: <len.brown@...el.com>
Cc: "linux-acpi" <linux-acpi@...el.com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] adjust ACPI register handling
acpi_hw_low_level_{read,write}() have no need to accept a NULL reg
argument anymore (all callers use addresses of or derived from ACPI
globals), and it really should always have been considered an error
to call these functions in such a way.
Additionally acpi_hw_low_level_read() should initialize the value
read in all cases when it returns successfully.
Also use ACPI_GPE_REGISTER_WIDTH where possible rather than a plain
number.
Signed-off-by: Jan Beulich <jbeulich@...ell.com>
---
drivers/acpi/hardware/hwgpe.c | 15 ++++++++-------
drivers/acpi/hardware/hwregs.c | 6 +++---
2 files changed, 11 insertions(+), 10 deletions(-)
--- linux-2.6.25-rc8/drivers/acpi/hardware/hwgpe.c 2007-04-26 05:08:32.000000000 +0200
+++ 2.6.25-rc8-acpi-hwregs/drivers/acpi/hardware/hwgpe.c 2008-04-03 10:59:59.000000000 +0200
@@ -84,7 +84,8 @@ acpi_hw_write_gpe_enable_reg(struct acpi
/* Write the entire GPE (runtime) enable register */
- status = acpi_hw_low_level_write(8, gpe_register_info->enable_for_run,
+ status = acpi_hw_low_level_write(ACPI_GPE_REGISTER_WIDTH,
+ gpe_register_info->enable_for_run,
&gpe_register_info->enable_address);
return (status);
@@ -118,7 +119,7 @@ acpi_status acpi_hw_clear_gpe(struct acp
* Write a one to the appropriate bit in the status register to
* clear this GPE.
*/
- status = acpi_hw_low_level_write(8, register_bit,
+ status = acpi_hw_low_level_write(ACPI_GPE_REGISTER_WIDTH, register_bit,
&gpe_event_info->register_info->
status_address);
@@ -181,7 +182,7 @@ acpi_hw_get_gpe_status(struct acpi_gpe_e
/* GPE currently active (status bit == 1)? */
status =
- acpi_hw_low_level_read(8, &in_byte,
+ acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH, &in_byte,
&gpe_register_info->status_address);
if (ACPI_FAILURE(status)) {
goto unlock_and_exit;
@@ -226,7 +227,7 @@ acpi_hw_disable_gpe_block(struct acpi_gp
/* Disable all GPEs in this register */
- status = acpi_hw_low_level_write(8, 0x00,
+ status = acpi_hw_low_level_write(ACPI_GPE_REGISTER_WIDTH, 0x00,
&gpe_block->register_info[i].
enable_address);
if (ACPI_FAILURE(status)) {
@@ -263,7 +264,7 @@ acpi_hw_clear_gpe_block(struct acpi_gpe_
/* Clear status on all GPEs in this register */
- status = acpi_hw_low_level_write(8, 0xFF,
+ status = acpi_hw_low_level_write(ACPI_GPE_REGISTER_WIDTH, 0xFF,
&gpe_block->register_info[i].
status_address);
if (ACPI_FAILURE(status)) {
@@ -307,7 +308,7 @@ acpi_hw_enable_runtime_gpe_block(struct
/* Enable all "runtime" GPEs in this register */
status =
- acpi_hw_low_level_write(8,
+ acpi_hw_low_level_write(ACPI_GPE_REGISTER_WIDTH,
gpe_block->register_info[i].
enable_for_run,
&gpe_block->register_info[i].
@@ -350,7 +351,7 @@ acpi_hw_enable_wakeup_gpe_block(struct a
/* Enable all "wake" GPEs in this register */
- status = acpi_hw_low_level_write(8,
+ status = acpi_hw_low_level_write(ACPI_GPE_REGISTER_WIDTH,
gpe_block->register_info[i].
enable_for_wake,
&gpe_block->register_info[i].
--- linux-2.6.25-rc8/drivers/acpi/hardware/hwregs.c 2008-01-24 23:58:37.000000000 +0100
+++ 2.6.25-rc8-acpi-hwregs/drivers/acpi/hardware/hwregs.c 2008-04-03 11:02:33.000000000 +0200
@@ -745,8 +745,9 @@ acpi_hw_low_level_read(u32 width, u32 *
* because the PM1A/B code must not fail if B isn't present.
*/
if (!reg) {
- return (AE_OK);
+ return (AE_BAD_PARAMETER);
}
+ *value = 0;
/* Get a local copy of the address. Handles possible alignment issues */
@@ -754,7 +755,6 @@ acpi_hw_low_level_read(u32 width, u32 *
if (!address) {
return (AE_OK);
}
- *value = 0;
/*
* Two address spaces supported: Memory or IO.
@@ -815,7 +815,7 @@ acpi_hw_low_level_write(u32 width, u32 v
* because the PM1A/B code must not fail if B isn't present.
*/
if (!reg) {
- return (AE_OK);
+ return (AE_BAD_PARAMETER);
}
/* Get a local copy of the address. Handles possible alignment issues */
--
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