diff options
author | Rafael J. Wysocki <rjw@sisk.pl> | 2008-07-07 03:33:34 +0200 |
---|---|---|
committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2008-07-07 16:25:57 -0700 |
commit | 77e766099efc29d8b01db4b8244ff64fa3d3d0ca (patch) | |
tree | 6868acb2376388e5c02ed45a685ac31cc31a0bb1 /drivers/acpi/power.c | |
parent | 44e4e66eeae5338b3ca0b28f8352e60bf18d5ba8 (diff) | |
download | linux-77e766099efc29d8b01db4b8244ff64fa3d3d0ca.tar.bz2 |
ACPI: Introduce acpi_device_sleep_wake function
The currect ACPI code attempts to execute _PSW at three different
places and in one of them only it tries to execute _DSW before _PSW,
which is inconsistent with the other two cases.
Move the execution of _DSW and _PSW into a separate function called
acpi_device_sleep_wake() and call it wherever appropriate instead of
executing _DSW and/or _PSW directly.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/acpi/power.c')
-rw-r--r-- | drivers/acpi/power.c | 118 |
1 files changed, 82 insertions, 36 deletions
diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c index 81e4f081a4ae..2e959aa1ef0e 100644 --- a/drivers/acpi/power.c +++ b/drivers/acpi/power.c @@ -292,69 +292,115 @@ static int acpi_power_off_device(acpi_handle handle, struct acpi_device *dev) return 0; } +/** + * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in + * ACPI 3.0) _PSW (Power State Wake) + * @dev: Device to handle. + * @enable: 0 - disable, 1 - enable the wake capabilities of the device. + * @sleep_state: Target sleep state of the system. + * @dev_state: Target power state of the device. + * + * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power + * State Wake) for the device, if present. On failure reset the device's + * wakeup.flags.valid flag. + * + * RETURN VALUE: + * 0 if either _DSW or _PSW has been successfully executed + * 0 if neither _DSW nor _PSW has been found + * -ENODEV if the execution of either _DSW or _PSW has failed + */ +int acpi_device_sleep_wake(struct acpi_device *dev, + int enable, int sleep_state, int dev_state) +{ + union acpi_object in_arg[3]; + struct acpi_object_list arg_list = { 3, in_arg }; + acpi_status status = AE_OK; + + /* + * Try to execute _DSW first. + * + * Three agruments are needed for the _DSW object: + * Argument 0: enable/disable the wake capabilities + * Argument 1: target system state + * Argument 2: target device state + * When _DSW object is called to disable the wake capabilities, maybe + * the first argument is filled. The values of the other two agruments + * are meaningless. + */ + in_arg[0].type = ACPI_TYPE_INTEGER; + in_arg[0].integer.value = enable; + in_arg[1].type = ACPI_TYPE_INTEGER; + in_arg[1].integer.value = sleep_state; + in_arg[2].type = ACPI_TYPE_INTEGER; + in_arg[2].integer.value = dev_state; + status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL); + if (ACPI_SUCCESS(status)) { + return 0; + } else if (status != AE_NOT_FOUND) { + printk(KERN_ERR PREFIX "_DSW execution failed\n"); + dev->wakeup.flags.valid = 0; + return -ENODEV; + } + + /* Execute _PSW */ + arg_list.count = 1; + in_arg[0].integer.value = enable; + status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); + if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { + printk(KERN_ERR PREFIX "_PSW execution failed\n"); + dev->wakeup.flags.valid = 0; + return -ENODEV; + } + + return 0; +} + /* * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): * 1. Power on the power resources required for the wakeup device - * 2. Enable _PSW (power state wake) for the device if present + * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power + * State Wake) for the device, if present */ -int acpi_enable_wakeup_device_power(struct acpi_device *dev) +int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state) { - union acpi_object arg = { ACPI_TYPE_INTEGER }; - struct acpi_object_list arg_list = { 1, &arg }; - acpi_status status = AE_OK; int i; - int ret = 0; if (!dev || !dev->wakeup.flags.valid) - return -1; + return -EINVAL; - arg.integer.value = 1; /* Open power resource */ for (i = 0; i < dev->wakeup.resources.count; i++) { - ret = acpi_power_on(dev->wakeup.resources.handles[i], dev); + int ret = acpi_power_on(dev->wakeup.resources.handles[i], dev); if (ret) { printk(KERN_ERR PREFIX "Transition power state\n"); dev->wakeup.flags.valid = 0; - return -1; + return -ENODEV; } } - /* Execute PSW */ - status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); - if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { - printk(KERN_ERR PREFIX "Evaluate _PSW\n"); - dev->wakeup.flags.valid = 0; - ret = -1; - } - - return ret; + /* + * Passing 3 as the third argument below means the device may be placed + * in arbitrary power state afterwards. + */ + return acpi_device_sleep_wake(dev, 1, sleep_state, 3); } /* * Shutdown a wakeup device, counterpart of above method - * 1. Disable _PSW (power state wake) + * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power + * State Wake) for the device, if present * 2. Shutdown down the power resources */ int acpi_disable_wakeup_device_power(struct acpi_device *dev) { - union acpi_object arg = { ACPI_TYPE_INTEGER }; - struct acpi_object_list arg_list = { 1, &arg }; - acpi_status status = AE_OK; - int i; - int ret = 0; - + int i, ret; if (!dev || !dev->wakeup.flags.valid) - return -1; + return -EINVAL; - arg.integer.value = 0; - /* Execute PSW */ - status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); - if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { - printk(KERN_ERR PREFIX "Evaluate _PSW\n"); - dev->wakeup.flags.valid = 0; - return -1; - } + ret = acpi_device_sleep_wake(dev, 0, 0, 0); + if (ret) + return ret; /* Close power resource */ for (i = 0; i < dev->wakeup.resources.count; i++) { @@ -362,7 +408,7 @@ int acpi_disable_wakeup_device_power(struct acpi_device *dev) if (ret) { printk(KERN_ERR PREFIX "Transition power state\n"); dev->wakeup.flags.valid = 0; - return -1; + return -ENODEV; } } |