* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
+/*
+ * ACPI power-managed devices may be controlled in two ways:
+ * 1. via "Device Specific (D-State) Control"
+ * 2. via "Power Resource Control".
+ * This module is used to manage devices relying on Power Resource Control.
+ *
+ * An ACPI "power resource object" describes a software controllable power
+ * plane, clock plane, or other resource used by a power managed device.
+ * A device may rely on multiple power resources, and a power resource
+ * may be shared by multiple devices.
+ */
+
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
-#include <linux/compatmac.h>
-#include <linux/proc_fs.h>
-#include "acpi_bus.h"
-#include "acpi_drivers.h"
-
+#include <linux/slab.h>
+#include <linux/pm_runtime.h>
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+#include "sleep.h"
+#include "internal.h"
-#define _COMPONENT ACPI_POWER_COMPONENT
-ACPI_MODULE_NAME ("acpi_power")
+#define PREFIX "ACPI: "
-#define ACPI_POWER_COMPONENT 0x00800000
+#define _COMPONENT ACPI_POWER_COMPONENT
+ACPI_MODULE_NAME("power");
#define ACPI_POWER_CLASS "power_resource"
-#define ACPI_POWER_DRIVER_NAME "ACPI Power Resource Driver"
#define ACPI_POWER_DEVICE_NAME "Power Resource"
#define ACPI_POWER_FILE_INFO "info"
#define ACPI_POWER_FILE_STATUS "state"
#define ACPI_POWER_RESOURCE_STATE_ON 0x01
#define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF
-int acpi_power_add (struct acpi_device *device);
-int acpi_power_remove (struct acpi_device *device, int type);
+static int acpi_power_add(struct acpi_device *device);
+static int acpi_power_remove(struct acpi_device *device, int type);
+static int acpi_power_resume(struct acpi_device *device);
+
+static const struct acpi_device_id power_device_ids[] = {
+ {ACPI_POWER_HID, 0},
+ {"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, power_device_ids);
static struct acpi_driver acpi_power_driver = {
- .name = ACPI_POWER_DRIVER_NAME,
- .class = ACPI_POWER_CLASS,
- .ids = ACPI_POWER_HID,
- .ops = {
- .add = acpi_power_add,
- .remove = acpi_power_remove,
- },
+ .name = "power",
+ .class = ACPI_POWER_CLASS,
+ .ids = power_device_ids,
+ .ops = {
+ .add = acpi_power_add,
+ .remove = acpi_power_remove,
+ .resume = acpi_power_resume,
+ },
};
-struct acpi_power_resource
-{
- acpi_handle handle;
- acpi_bus_id name;
- u32 system_level;
- u32 order;
- int state;
- int references;
+/*
+ * A power managed device
+ * A device may rely on multiple power resources.
+ * */
+struct acpi_power_managed_device {
+ struct device *dev; /* The physical device */
+ acpi_handle *handle;
+};
+
+struct acpi_power_resource_device {
+ struct acpi_power_managed_device *device;
+ struct acpi_power_resource_device *next;
};
-static struct list_head acpi_power_resource_list;
+struct acpi_power_resource {
+ struct acpi_device * device;
+ acpi_bus_id name;
+ u32 system_level;
+ u32 order;
+ unsigned int ref_count;
+ struct mutex resource_lock;
+ /* List of devices relying on this power resource */
+ struct acpi_power_resource_device *devices;
+};
+
+static struct list_head acpi_power_resource_list;
/* --------------------------------------------------------------------------
Power Resource Management
-------------------------------------------------------------------------- */
static int
-acpi_power_get_context (
- acpi_handle handle,
- struct acpi_power_resource **resource)
+acpi_power_get_context(acpi_handle handle,
+ struct acpi_power_resource **resource)
{
- int result = 0;
- struct acpi_device *device = NULL;
+ int result = 0;
+ struct acpi_device *device = NULL;
- ACPI_FUNCTION_TRACE("acpi_power_get_context");
if (!resource)
- return_VALUE(-ENODEV);
+ return -ENODEV;
result = acpi_bus_get_device(handle, &device);
if (result) {
- ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Error getting context [%p]\n",
- handle));
- return_VALUE(result);
+ printk(KERN_WARNING PREFIX "Getting context [%p]\n", handle);
+ return result;
}
- *resource = (struct acpi_power_resource *) acpi_driver_data(device);
- if (!resource)
- return_VALUE(-ENODEV);
+ *resource = acpi_driver_data(device);
+ if (!*resource)
+ return -ENODEV;
- return_VALUE(0);
+ return 0;
}
-
-static int
-acpi_power_get_state (
- struct acpi_power_resource *resource)
+static int acpi_power_get_state(acpi_handle handle, int *state)
{
- acpi_status status = AE_OK;
- unsigned long sta = 0;
+ acpi_status status = AE_OK;
+ unsigned long long sta = 0;
+ char node_name[5];
+ struct acpi_buffer buffer = { sizeof(node_name), node_name };
- ACPI_FUNCTION_TRACE("acpi_power_get_state");
- if (!resource)
- return_VALUE(-EINVAL);
+ if (!handle || !state)
+ return -EINVAL;
- status = acpi_evaluate_integer(resource->handle, "_STA", NULL, &sta);
+ status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
if (ACPI_FAILURE(status))
- return_VALUE(-ENODEV);
+ return -ENODEV;
+
+ *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON:
+ ACPI_POWER_RESOURCE_STATE_OFF;
- if (sta & 0x01)
- resource->state = ACPI_POWER_RESOURCE_STATE_ON;
- else
- resource->state = ACPI_POWER_RESOURCE_STATE_OFF;
+ acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n",
- resource->name, resource->state?"on":"off"));
+ node_name,
+ *state ? "on" : "off"));
- return_VALUE(0);
+ return 0;
}
-
-static int
-acpi_power_get_list_state (
- struct acpi_handle_list *list,
- int *state)
+static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state)
{
- int result = 0;
- struct acpi_power_resource *resource = NULL;
- u32 i = 0;
-
- ACPI_FUNCTION_TRACE("acpi_power_get_list_state");
+ int cur_state;
+ int i = 0;
if (!list || !state)
- return_VALUE(-EINVAL);
+ return -EINVAL;
/* The state of the list is 'on' IFF all resources are 'on'. */
- for (i=0; i<list->count; i++) {
- result = acpi_power_get_context(list->handles[i], &resource);
- if (result)
- return_VALUE(result);
- result = acpi_power_get_state(resource);
+ for (i = 0; i < list->count; i++) {
+ struct acpi_power_resource *resource;
+ acpi_handle handle = list->handles[i];
+ int result;
+
+ result = acpi_power_get_context(handle, &resource);
if (result)
- return_VALUE(result);
+ return result;
+
+ mutex_lock(&resource->resource_lock);
+
+ result = acpi_power_get_state(handle, &cur_state);
+
+ mutex_unlock(&resource->resource_lock);
- *state = resource->state;
+ if (result)
+ return result;
- if (*state != ACPI_POWER_RESOURCE_STATE_ON)
+ if (cur_state != ACPI_POWER_RESOURCE_STATE_ON)
break;
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n",
- *state?"on":"off"));
+ cur_state ? "on" : "off"));
- return_VALUE(result);
-}
+ *state = cur_state;
+ return 0;
+}
-static int
-acpi_power_on (
- acpi_handle handle)
+/* Resume the device when all power resources in _PR0 are on */
+static void acpi_power_on_device(struct acpi_power_managed_device *device)
{
- int result = 0;
- acpi_status status = AE_OK;
- struct acpi_device *device = NULL;
- struct acpi_power_resource *resource = NULL;
+ struct acpi_device *acpi_dev;
+ acpi_handle handle = device->handle;
+ int state;
- ACPI_FUNCTION_TRACE("acpi_power_on");
+ if (acpi_bus_get_device(handle, &acpi_dev))
+ return;
- result = acpi_power_get_context(handle, &resource);
- if (result)
- return_VALUE(result);
+ if(acpi_power_get_inferred_state(acpi_dev, &state))
+ return;
- resource->references++;
+ if (state == ACPI_STATE_D0 && pm_runtime_suspended(device->dev))
+ pm_request_resume(device->dev);
+}
- if ((resource->references > 1)
- || (resource->state == ACPI_POWER_RESOURCE_STATE_ON)) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] already on\n",
- resource->name));
- return_VALUE(0);
- }
+static int __acpi_power_on(struct acpi_power_resource *resource)
+{
+ struct acpi_power_resource_device *device_list = resource->devices;
+ acpi_status status = AE_OK;
- status = acpi_evaluate_object(resource->handle, "_ON", NULL, NULL);
+ status = acpi_evaluate_object(resource->device->handle, "_ON", NULL, NULL);
if (ACPI_FAILURE(status))
- return_VALUE(-ENODEV);
-
- result = acpi_power_get_state(resource);
- if (result)
- return_VALUE(result);
- if (resource->state != ACPI_POWER_RESOURCE_STATE_ON)
- return_VALUE(-ENOEXEC);
+ return -ENODEV;
/* Update the power resource's _device_ power state */
- result = acpi_bus_get_device(resource->handle, &device);
- if (result)
- return_VALUE(result);
- device->power.state = ACPI_STATE_D0;
+ resource->device->power.state = ACPI_STATE_D0;
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned on\n",
- resource->name));
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n",
+ resource->name));
- return_VALUE(0);
-}
+ while (device_list) {
+ acpi_power_on_device(device_list->device);
+ device_list = device_list->next;
+ }
-static int
-acpi_power_off_device (
- acpi_handle handle)
+ return 0;
+}
+
+static int acpi_power_on(acpi_handle handle)
{
- int result = 0;
- acpi_status status = AE_OK;
- struct acpi_device *device = NULL;
+ int result = 0;
struct acpi_power_resource *resource = NULL;
- ACPI_FUNCTION_TRACE("acpi_power_off_device");
-
result = acpi_power_get_context(handle, &resource);
if (result)
- return_VALUE(result);
+ return result;
- if (resource->references)
- resource->references--;
+ mutex_lock(&resource->resource_lock);
- if (resource->references) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "Resource [%s] is still in use, dereferencing\n",
- device->pnp.bus_id));
- return_VALUE(0);
+ if (resource->ref_count++) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Power resource [%s] already on",
+ resource->name));
+ } else {
+ result = __acpi_power_on(resource);
+ if (result)
+ resource->ref_count--;
}
- if (resource->state == ACPI_POWER_RESOURCE_STATE_OFF) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] already off\n",
- device->pnp.bus_id));
- return_VALUE(0);
- }
+ mutex_unlock(&resource->resource_lock);
- status = acpi_evaluate_object(resource->handle, "_OFF", NULL, NULL);
- if (ACPI_FAILURE(status))
- return_VALUE(-ENODEV);
+ return result;
+}
- result = acpi_power_get_state(resource);
- if (result)
- return_VALUE(result);
- if (resource->state != ACPI_POWER_RESOURCE_STATE_OFF)
- return_VALUE(-ENOEXEC);
+static int acpi_power_off(acpi_handle handle)
+{
+ int result = 0;
+ acpi_status status = AE_OK;
+ struct acpi_power_resource *resource = NULL;
- /* Update the power resource's _device_ power state */
- result = acpi_bus_get_device(resource->handle, &device);
+ result = acpi_power_get_context(handle, &resource);
if (result)
- return_VALUE(result);
- device->power.state = ACPI_STATE_D3;
+ return result;
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned off\n",
- resource->name));
+ mutex_lock(&resource->resource_lock);
- return_VALUE(0);
-}
+ if (!resource->ref_count) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Power resource [%s] already off",
+ resource->name));
+ goto unlock;
+ }
+ if (--resource->ref_count) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Power resource [%s] still in use\n",
+ resource->name));
+ goto unlock;
+ }
-/* --------------------------------------------------------------------------
- Device Power Management
- -------------------------------------------------------------------------- */
+ status = acpi_evaluate_object(resource->device->handle, "_OFF", NULL, NULL);
+ if (ACPI_FAILURE(status)) {
+ result = -ENODEV;
+ } else {
+ /* Update the power resource's _device_ power state */
+ resource->device->power.state = ACPI_STATE_D3;
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Power resource [%s] turned off\n",
+ resource->name));
+ }
+
+ unlock:
+ mutex_unlock(&resource->resource_lock);
-int
-acpi_power_get_inferred_state (
- struct acpi_device *device)
+ return result;
+}
+
+static void __acpi_power_off_list(struct acpi_handle_list *list, int num_res)
{
- int result = 0;
- struct acpi_handle_list *list = NULL;
- int list_state = 0;
- int i = 0;
+ int i;
- ACPI_FUNCTION_TRACE("acpi_power_get_inferred_state");
+ for (i = num_res - 1; i >= 0 ; i--)
+ acpi_power_off(list->handles[i]);
+}
- if (!device)
- return_VALUE(-EINVAL);
+static void acpi_power_off_list(struct acpi_handle_list *list)
+{
+ __acpi_power_off_list(list, list->count);
+}
- device->power.state = ACPI_STATE_UNKNOWN;
+static int acpi_power_on_list(struct acpi_handle_list *list)
+{
+ int result = 0;
+ int i;
- /*
- * We know a device's inferred power state when all the resources
- * required for a given D-state are 'on'.
- */
- for (i=ACPI_STATE_D0; i<ACPI_STATE_D3; i++) {
- list = &device->power.states[i].resources;
- if (list->count < 1)
- continue;
+ for (i = 0; i < list->count; i++) {
+ result = acpi_power_on(list->handles[i]);
+ if (result) {
+ __acpi_power_off_list(list, i);
+ break;
+ }
+ }
- result = acpi_power_get_list_state(list, &list_state);
- if (result)
- return_VALUE(result);
+ return result;
+}
- if (list_state == ACPI_POWER_RESOURCE_STATE_ON) {
- device->power.state = i;
- return_VALUE(0);
+static void __acpi_power_resource_unregister_device(struct device *dev,
+ acpi_handle res_handle)
+{
+ struct acpi_power_resource *resource = NULL;
+ struct acpi_power_resource_device *prev, *curr;
+
+ if (acpi_power_get_context(res_handle, &resource))
+ return;
+
+ mutex_lock(&resource->resource_lock);
+ prev = NULL;
+ curr = resource->devices;
+ while (curr) {
+ if (curr->device->dev == dev) {
+ if (!prev)
+ resource->devices = curr->next;
+ else
+ prev->next = curr->next;
+
+ kfree(curr);
+ break;
}
+
+ prev = curr;
+ curr = curr->next;
}
+ mutex_unlock(&resource->resource_lock);
+}
- device->power.state = ACPI_STATE_D3;
+/* Unlink dev from all power resources in _PR0 */
+void acpi_power_resource_unregister_device(struct device *dev, acpi_handle handle)
+{
+ struct acpi_device *acpi_dev;
+ struct acpi_handle_list *list;
+ int i;
+
+ if (!dev || !handle)
+ return;
+
+ if (acpi_bus_get_device(handle, &acpi_dev))
+ return;
+
+ list = &acpi_dev->power.states[ACPI_STATE_D0].resources;
- return_VALUE(0);
+ for (i = 0; i < list->count; i++)
+ __acpi_power_resource_unregister_device(dev,
+ list->handles[i]);
}
+static int __acpi_power_resource_register_device(
+ struct acpi_power_managed_device *powered_device, acpi_handle handle)
+{
+ struct acpi_power_resource *resource = NULL;
+ struct acpi_power_resource_device *power_resource_device;
+ int result;
+
+ result = acpi_power_get_context(handle, &resource);
+ if (result)
+ return result;
+
+ power_resource_device = kzalloc(
+ sizeof(*power_resource_device), GFP_KERNEL);
+ if (!power_resource_device)
+ return -ENOMEM;
+
+ power_resource_device->device = powered_device;
+
+ mutex_lock(&resource->resource_lock);
+ power_resource_device->next = resource->devices;
+ resource->devices = power_resource_device;
+ mutex_unlock(&resource->resource_lock);
+
+ return 0;
+}
-int
-acpi_power_transition (
- struct acpi_device *device,
- int state)
+/* Link dev to all power resources in _PR0 */
+int acpi_power_resource_register_device(struct device *dev, acpi_handle handle)
{
- int result = 0;
- struct acpi_handle_list *cl = NULL; /* Current Resources */
- struct acpi_handle_list *tl = NULL; /* Target Resources */
- int i = 0;
+ struct acpi_device *acpi_dev;
+ struct acpi_handle_list *list;
+ struct acpi_power_managed_device *powered_device;
+ int i, ret;
- ACPI_FUNCTION_TRACE("acpi_power_transition");
+ if (!dev || !handle)
+ return -ENODEV;
- if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
- return_VALUE(-EINVAL);
+ ret = acpi_bus_get_device(handle, &acpi_dev);
+ if (ret)
+ goto no_power_resource;
- cl = &device->power.states[device->power.state].resources;
- tl = &device->power.states[state].resources;
+ if (!acpi_dev->power.flags.power_resources)
+ goto no_power_resource;
- device->power.state = ACPI_STATE_UNKNOWN;
+ powered_device = kzalloc(sizeof(*powered_device), GFP_KERNEL);
+ if (!powered_device)
+ return -ENOMEM;
- if (!cl->count && !tl->count) {
- result = -ENODEV;
- goto end;
- }
+ powered_device->dev = dev;
+ powered_device->handle = handle;
- /* TBD: Resources must be ordered. */
+ list = &acpi_dev->power.states[ACPI_STATE_D0].resources;
- /*
- * First we reference all power resources required in the target list
- * (e.g. so the device doesn't loose power while transitioning).
- */
- for (i=0; i<tl->count; i++) {
- result = acpi_power_on(tl->handles[i]);
- if (result)
- goto end;
+ for (i = 0; i < list->count; i++) {
+ ret = __acpi_power_resource_register_device(powered_device,
+ list->handles[i]);
+
+ if (ret) {
+ acpi_power_resource_unregister_device(dev, handle);
+ break;
+ }
}
- device->power.state = state;
+ return ret;
+
+no_power_resource:
+ printk(KERN_WARNING PREFIX "Invalid Power Resource to register!");
+ return -ENODEV;
+}
+
+/**
+ * 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;
/*
- * Then we dereference all power resources used in the current list.
+ * 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.
*/
- for (i=0; i<cl->count; i++) {
- result = acpi_power_off_device(cl->handles[i]);
- if (result)
- goto end;
+ 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;
}
-end:
- if (result)
- ACPI_DEBUG_PRINT((ACPI_DB_WARN,
- "Error transitioning device [%s] to D%d\n",
- device->pnp.bus_id, state));
+ /* 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_VALUE(result);
+ 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. 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 sleep_state)
+{
+ int i, err = 0;
-/* --------------------------------------------------------------------------
- FS Interface (/proc)
- -------------------------------------------------------------------------- */
+ if (!dev || !dev->wakeup.flags.valid)
+ return -EINVAL;
-struct proc_dir_entry *acpi_power_dir = NULL;
+ mutex_lock(&acpi_device_lock);
+ if (dev->wakeup.prepare_count++)
+ goto out;
-static int
-acpi_power_read_status (
- char *page,
- char **start,
- off_t off,
- int count,
- int *eof,
- void *data)
+ /* Open power resource */
+ for (i = 0; i < dev->wakeup.resources.count; i++) {
+ int ret = acpi_power_on(dev->wakeup.resources.handles[i]);
+ if (ret) {
+ printk(KERN_ERR PREFIX "Transition power state\n");
+ dev->wakeup.flags.valid = 0;
+ err = -ENODEV;
+ goto err_out;
+ }
+ }
+
+ /*
+ * Passing 3 as the third argument below means the device may be placed
+ * in arbitrary power state afterwards.
+ */
+ err = acpi_device_sleep_wake(dev, 1, sleep_state, 3);
+
+ err_out:
+ if (err)
+ dev->wakeup.prepare_count = 0;
+
+ out:
+ mutex_unlock(&acpi_device_lock);
+ return err;
+}
+
+/*
+ * Shutdown a wakeup device, counterpart of above method
+ * 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)
{
- struct acpi_power_resource *resource = NULL;
- char *p = page;
- int len;
+ int i, err = 0;
- ACPI_FUNCTION_TRACE("acpi_power_read_status");
+ if (!dev || !dev->wakeup.flags.valid)
+ return -EINVAL;
- if (!data || (off != 0))
- goto end;
+ mutex_lock(&acpi_device_lock);
- resource = (struct acpi_power_resource *) data;
+ if (--dev->wakeup.prepare_count > 0)
+ goto out;
- p += sprintf(p, "state: ");
- switch (resource->state) {
- case ACPI_POWER_RESOURCE_STATE_ON:
- p += sprintf(p, "on\n");
- break;
- case ACPI_POWER_RESOURCE_STATE_OFF:
- p += sprintf(p, "off\n");
- break;
- default:
- p += sprintf(p, "unknown\n");
- break;
+ /*
+ * Executing the code below even if prepare_count is already zero when
+ * the function is called may be useful, for example for initialisation.
+ */
+ if (dev->wakeup.prepare_count < 0)
+ dev->wakeup.prepare_count = 0;
+
+ err = acpi_device_sleep_wake(dev, 0, 0, 0);
+ if (err)
+ goto out;
+
+ /* Close power resource */
+ for (i = 0; i < dev->wakeup.resources.count; i++) {
+ int ret = acpi_power_off(dev->wakeup.resources.handles[i]);
+ if (ret) {
+ printk(KERN_ERR PREFIX "Transition power state\n");
+ dev->wakeup.flags.valid = 0;
+ err = -ENODEV;
+ goto out;
+ }
}
- p += sprintf(p, "system level: S%d\n",
- resource->system_level);
- p += sprintf(p, "order: %d\n",
- resource->order);
- p += sprintf(p, "reference count: %d\n",
- resource->references);
-
-end:
- len = (p - page);
- if (len <= off+count) *eof = 1;
- *start = page + off;
- len -= off;
- if (len>count) len = count;
- if (len<0) len = 0;
-
- return_VALUE(len);
+ out:
+ mutex_unlock(&acpi_device_lock);
+ return err;
}
+/* --------------------------------------------------------------------------
+ Device Power Management
+ -------------------------------------------------------------------------- */
-static int
-acpi_power_add_fs (
- struct acpi_device *device)
+int acpi_power_get_inferred_state(struct acpi_device *device, int *state)
{
- struct proc_dir_entry *entry = NULL;
+ int result = 0;
+ struct acpi_handle_list *list = NULL;
+ int list_state = 0;
+ int i = 0;
- ACPI_FUNCTION_TRACE("acpi_power_add_fs");
-
- if (!device)
- return_VALUE(-EINVAL);
+ if (!device || !state)
+ return -EINVAL;
- if (!acpi_power_dir) {
- acpi_power_dir = proc_mkdir(ACPI_POWER_CLASS, acpi_root_dir);
- if (!acpi_power_dir)
- return_VALUE(-ENODEV);
- }
+ /*
+ * We know a device's inferred power state when all the resources
+ * required for a given D-state are 'on'.
+ */
+ for (i = ACPI_STATE_D0; i < ACPI_STATE_D3_HOT; i++) {
+ list = &device->power.states[i].resources;
+ if (list->count < 1)
+ continue;
- if (!acpi_device_dir(device)) {
- acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
- acpi_power_dir);
- if (!acpi_device_dir(device))
- return_VALUE(-ENODEV);
- }
+ result = acpi_power_get_list_state(list, &list_state);
+ if (result)
+ return result;
- /* 'status' [R] */
- entry = create_proc_entry(ACPI_POWER_FILE_STATUS,
- S_IRUGO, acpi_device_dir(device));
- if (!entry)
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Unable to create '%s' fs entry\n",
- ACPI_POWER_FILE_STATUS));
- else {
- entry->read_proc = acpi_power_read_status;
- entry->data = acpi_driver_data(device);
+ if (list_state == ACPI_POWER_RESOURCE_STATE_ON) {
+ *state = i;
+ return 0;
+ }
}
- return_VALUE(0);
+ *state = ACPI_STATE_D3;
+ return 0;
}
+int acpi_power_on_resources(struct acpi_device *device, int state)
+{
+ if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3)
+ return -EINVAL;
-static int
-acpi_power_remove_fs (
- struct acpi_device *device)
+ return acpi_power_on_list(&device->power.states[state].resources);
+}
+
+int acpi_power_transition(struct acpi_device *device, int state)
{
- ACPI_FUNCTION_TRACE("acpi_power_remove_fs");
+ int result = 0;
- if (!acpi_power_dir)
- return_VALUE(-ENODEV);
+ if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
+ return -EINVAL;
- if (acpi_device_dir(device))
- remove_proc_entry(acpi_device_bid(device), acpi_power_dir);
+ if (device->power.state == state)
+ return 0;
- return_VALUE(0);
-}
+ if ((device->power.state < ACPI_STATE_D0)
+ || (device->power.state > ACPI_STATE_D3_COLD))
+ return -ENODEV;
+
+ /* TBD: Resources must be ordered. */
+
+ /*
+ * First we reference all power resources required in the target list
+ * (e.g. so the device doesn't lose power while transitioning). Then,
+ * we dereference all power resources used in the current list.
+ */
+ if (state < ACPI_STATE_D3_COLD)
+ result = acpi_power_on_list(
+ &device->power.states[state].resources);
+ if (!result && device->power.state < ACPI_STATE_D3_COLD)
+ acpi_power_off_list(
+ &device->power.states[device->power.state].resources);
+
+ /* We shouldn't change the state unless the above operations succeed. */
+ device->power.state = result ? ACPI_STATE_UNKNOWN : state;
+
+ return result;
+}
/* --------------------------------------------------------------------------
Driver Interface
-------------------------------------------------------------------------- */
-int
-acpi_power_add (
- struct acpi_device *device)
+static int acpi_power_add(struct acpi_device *device)
{
- int result = 0;
- acpi_status status = AE_OK;
+ int result = 0, state;
+ acpi_status status = AE_OK;
struct acpi_power_resource *resource = NULL;
- acpi_object acpi_object;
- acpi_buffer buffer = {sizeof(acpi_object), &acpi_object};
+ union acpi_object acpi_object;
+ struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
- ACPI_FUNCTION_TRACE("acpi_power_add");
if (!device)
- return_VALUE(-EINVAL);
+ return -EINVAL;
- resource = kmalloc(sizeof(struct acpi_power_resource), GFP_KERNEL);
+ resource = kzalloc(sizeof(struct acpi_power_resource), GFP_KERNEL);
if (!resource)
- return_VALUE(-ENOMEM);
- memset(resource, 0, sizeof(struct acpi_power_resource));
+ return -ENOMEM;
- resource->handle = device->handle;
- sprintf(resource->name, "%s", device->pnp.bus_id);
- sprintf(acpi_device_name(device), "%s", ACPI_POWER_DEVICE_NAME);
- sprintf(acpi_device_class(device), "%s", ACPI_POWER_CLASS);
- acpi_driver_data(device) = resource;
+ resource->device = device;
+ mutex_init(&resource->resource_lock);
+ strcpy(resource->name, device->pnp.bus_id);
+ strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
+ strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
+ device->driver_data = resource;
/* Evalute the object to get the system level and resource order. */
- status = acpi_evaluate_object(resource->handle, NULL, NULL, &buffer);
+ status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer);
if (ACPI_FAILURE(status)) {
result = -ENODEV;
goto end;
resource->system_level = acpi_object.power_resource.system_level;
resource->order = acpi_object.power_resource.resource_order;
- result = acpi_power_get_state(resource);
+ result = acpi_power_get_state(device->handle, &state);
if (result)
goto end;
- switch (resource->state) {
+ switch (state) {
case ACPI_POWER_RESOURCE_STATE_ON:
device->power.state = ACPI_STATE_D0;
break;
break;
}
- result = acpi_power_add_fs(device);
- if (result)
- goto end;
-
printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device),
- acpi_device_bid(device), resource->state?"on":"off");
+ acpi_device_bid(device), state ? "on" : "off");
-end:
+ end:
if (result)
kfree(resource);
-
- return_VALUE(result);
-}
+ return result;
+}
-int
-acpi_power_remove (
- struct acpi_device *device,
- int type)
+static int acpi_power_remove(struct acpi_device *device, int type)
{
- struct acpi_power_resource *resource = NULL;
+ struct acpi_power_resource *resource;
- ACPI_FUNCTION_TRACE("acpi_power_remove");
-
- if (!device || !acpi_driver_data(device))
- return_VALUE(-EINVAL);
-
- resource = (struct acpi_power_resource *) acpi_driver_data(device);
+ if (!device)
+ return -EINVAL;
- acpi_power_remove_fs(device);
+ resource = acpi_driver_data(device);
+ if (!resource)
+ return -EINVAL;
kfree(resource);
- return_VALUE(0);
+ return 0;
}
-
-static int __init acpi_power_init (void)
+static int acpi_power_resume(struct acpi_device *device)
{
- int result = 0;
+ int result = 0, state;
+ struct acpi_power_resource *resource;
- ACPI_FUNCTION_TRACE("acpi_power_init");
+ if (!device)
+ return -EINVAL;
- if (acpi_disabled)
- return_VALUE(0);
+ resource = acpi_driver_data(device);
+ if (!resource)
+ return -EINVAL;
- INIT_LIST_HEAD(&acpi_power_resource_list);
+ mutex_lock(&resource->resource_lock);
- result = acpi_bus_register_driver(&acpi_power_driver);
- if (result < 0) {
- remove_proc_entry(ACPI_POWER_CLASS, acpi_root_dir);
- return_VALUE(-ENODEV);
- }
+ result = acpi_power_get_state(device->handle, &state);
+ if (result)
+ goto unlock;
- return_VALUE(0);
-}
+ if (state == ACPI_POWER_RESOURCE_STATE_OFF && resource->ref_count)
+ result = __acpi_power_on(resource);
+
+ unlock:
+ mutex_unlock(&resource->resource_lock);
-subsys_initcall(acpi_power_init);
+ return result;
+}
+int __init acpi_power_init(void)
+{
+ INIT_LIST_HEAD(&acpi_power_resource_list);
+ return acpi_bus_register_driver(&acpi_power_driver);
+}
projects / linux-flexiantxendom0-3.2.10.git / blobdiff