diff options
Diffstat (limited to 'drivers/acpi/wakeup.c')
| -rw-r--r-- | drivers/acpi/wakeup.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/drivers/acpi/wakeup.c b/drivers/acpi/wakeup.c new file mode 100644 index 00000000000..2d34806d45d --- /dev/null +++ b/drivers/acpi/wakeup.c @@ -0,0 +1,167 @@ +/* + * wakeup.c - support wakeup devices + * Copyright (C) 2004 Li Shaohua <shaohua.li@intel.com> + */ + +#include <linux/init.h> +#include <linux/acpi.h> +#include <acpi/acpi_drivers.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include "sleep.h" + +#define _COMPONENT ACPI_SYSTEM_COMPONENT +ACPI_MODULE_NAME("wakeup_devices") + +extern struct list_head acpi_wakeup_device_list; +extern spinlock_t acpi_device_lock; + +/** + * acpi_enable_wakeup_device_prep - prepare wakeup devices + * @sleep_state: ACPI state + * Enable all wakup devices power if the devices' wakeup level + * is higher than requested sleep level + */ + +void acpi_enable_wakeup_device_prep(u8 sleep_state) +{ + struct list_head *node, *next; + + spin_lock(&acpi_device_lock); + list_for_each_safe(node, next, &acpi_wakeup_device_list) { + struct acpi_device *dev = container_of(node, + struct acpi_device, + wakeup_list); + + if (!dev->wakeup.flags.valid || + !dev->wakeup.state.enabled || + (sleep_state > (u32) dev->wakeup.sleep_state)) + continue; + + spin_unlock(&acpi_device_lock); + acpi_enable_wakeup_device_power(dev, sleep_state); + spin_lock(&acpi_device_lock); + } + spin_unlock(&acpi_device_lock); +} + +/** + * acpi_enable_wakeup_device - enable wakeup devices + * @sleep_state: ACPI state + * Enable all wakup devices's GPE + */ +void acpi_enable_wakeup_device(u8 sleep_state) +{ + struct list_head *node, *next; + + /* + * Caution: this routine must be invoked when interrupt is disabled + * Refer ACPI2.0: P212 + */ + spin_lock(&acpi_device_lock); + list_for_each_safe(node, next, &acpi_wakeup_device_list) { + struct acpi_device *dev = + container_of(node, struct acpi_device, wakeup_list); + + if (!dev->wakeup.flags.valid) + continue; + + /* If users want to disable run-wake GPE, + * we only disable it for wake and leave it for runtime + */ + if ((!dev->wakeup.state.enabled && !dev->wakeup.flags.prepared) + || sleep_state > (u32) dev->wakeup.sleep_state) { + if (dev->wakeup.flags.run_wake) { + spin_unlock(&acpi_device_lock); + /* set_gpe_type will disable GPE, leave it like that */ + acpi_set_gpe_type(dev->wakeup.gpe_device, + dev->wakeup.gpe_number, + ACPI_GPE_TYPE_RUNTIME); + spin_lock(&acpi_device_lock); + } + continue; + } + spin_unlock(&acpi_device_lock); + if (!dev->wakeup.flags.run_wake) + acpi_enable_gpe(dev->wakeup.gpe_device, + dev->wakeup.gpe_number); + spin_lock(&acpi_device_lock); + } + spin_unlock(&acpi_device_lock); +} + +/** + * acpi_disable_wakeup_device - disable devices' wakeup capability + * @sleep_state: ACPI state + * Disable all wakup devices's GPE and wakeup capability + */ +void acpi_disable_wakeup_device(u8 sleep_state) +{ + struct list_head *node, *next; + + spin_lock(&acpi_device_lock); + list_for_each_safe(node, next, &acpi_wakeup_device_list) { + struct acpi_device *dev = + container_of(node, struct acpi_device, wakeup_list); + + if (!dev->wakeup.flags.valid) + continue; + + if ((!dev->wakeup.state.enabled && !dev->wakeup.flags.prepared) + || sleep_state > (u32) dev->wakeup.sleep_state) { + if (dev->wakeup.flags.run_wake) { + spin_unlock(&acpi_device_lock); + acpi_set_gpe_type(dev->wakeup.gpe_device, + dev->wakeup.gpe_number, + ACPI_GPE_TYPE_WAKE_RUN); + /* Re-enable it, since set_gpe_type will disable it */ + acpi_enable_gpe(dev->wakeup.gpe_device, + dev->wakeup.gpe_number); + spin_lock(&acpi_device_lock); + } + continue; + } + + spin_unlock(&acpi_device_lock); + acpi_disable_wakeup_device_power(dev); + /* Never disable run-wake GPE */ + if (!dev->wakeup.flags.run_wake) { + acpi_disable_gpe(dev->wakeup.gpe_device, + dev->wakeup.gpe_number); + acpi_clear_gpe(dev->wakeup.gpe_device, + dev->wakeup.gpe_number, ACPI_NOT_ISR); + } + spin_lock(&acpi_device_lock); + } + spin_unlock(&acpi_device_lock); +} + +static int __init acpi_wakeup_device_init(void) +{ + struct list_head *node, *next; + + if (acpi_disabled) + return 0; + + spin_lock(&acpi_device_lock); + list_for_each_safe(node, next, &acpi_wakeup_device_list) { + struct acpi_device *dev = container_of(node, + struct acpi_device, + wakeup_list); + /* In case user doesn't load button driver */ + if (!dev->wakeup.flags.run_wake || dev->wakeup.state.enabled) + continue; + spin_unlock(&acpi_device_lock); + acpi_set_gpe_type(dev->wakeup.gpe_device, + dev->wakeup.gpe_number, + ACPI_GPE_TYPE_WAKE_RUN); + acpi_enable_gpe(dev->wakeup.gpe_device, + dev->wakeup.gpe_number); + dev->wakeup.state.enabled = 1; + spin_lock(&acpi_device_lock); + } + spin_unlock(&acpi_device_lock); + return 0; +} + +late_initcall(acpi_wakeup_device_init); |