1 files changed, 692 insertions, 0 deletions

diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
new file mode 100644
index 000000000000..373a3a95bb4e
--- /dev/null
+++ b/drivers/acpi/power.c
@@ -0,0 +1,692 @@
+/*
+ *  acpi_power.c - ACPI Bus Power Management ($Revision: 39 $)
+ *
+ *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
+ *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or (at
+ *  your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but
+ *  WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+/*
+ * 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/proc_fs.h>
+#include <linux/seq_file.h>
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+
+
+#define _COMPONENT              ACPI_POWER_COMPONENT
+ACPI_MODULE_NAME                ("acpi_power")
+
+#define ACPI_POWER_COMPONENT            0x00800000
+#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_OFF   0x00
+#define ACPI_POWER_RESOURCE_STATE_ON    0x01
+#define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF
+
+static int acpi_power_add (struct acpi_device *device);
+static int acpi_power_remove (struct acpi_device *device, int type);
+static int acpi_power_open_fs(struct inode *inode, struct file *file);
+
+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,
+                        },
+};
+
+struct acpi_power_resource
+{
+        acpi_handle             handle;
+        acpi_bus_id             name;
+        u32                     system_level;
+        u32                     order;
+        int                     state;
+        int                     references;
+};
+
+static struct list_head         acpi_power_resource_list;
+
+static struct file_operations acpi_power_fops = {
+        .open           = acpi_power_open_fs,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+/* --------------------------------------------------------------------------
+                             Power Resource Management
+   -------------------------------------------------------------------------- */
+
+static int
+acpi_power_get_context (
+        acpi_handle             handle,
+        struct acpi_power_resource **resource)
+{
+        int                     result = 0;
+        struct acpi_device      *device = NULL;
+
+        ACPI_FUNCTION_TRACE("acpi_power_get_context");
+
+        if (!resource)
+                return_VALUE(-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);
+        }
+
+        *resource = (struct acpi_power_resource *) acpi_driver_data(device);
+        if (!resource)
+                return_VALUE(-ENODEV);
+
+        return_VALUE(0);
+}
+
+
+static int
+acpi_power_get_state (
+        struct acpi_power_resource *resource)
+{
+        acpi_status             status = AE_OK;
+        unsigned long           sta = 0;
+
+        ACPI_FUNCTION_TRACE("acpi_power_get_state");
+
+        if (!resource)
+                return_VALUE(-EINVAL);
+
+        status = acpi_evaluate_integer(resource->handle, "_STA", NULL, &sta);
+        if (ACPI_FAILURE(status))
+                return_VALUE(-ENODEV);
+
+        if (sta & 0x01)
+                resource->state = ACPI_POWER_RESOURCE_STATE_ON;
+        else
+                resource->state = ACPI_POWER_RESOURCE_STATE_OFF;
+
+        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n",
+                resource->name, resource->state?"on":"off"));
+
+        return_VALUE(0);
+}
+
+
+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");
+
+        if (!list || !state)
+                return_VALUE(-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);
+                if (result)
+                        return_VALUE(result);
+
+                *state = resource->state;
+
+                if (*state != ACPI_POWER_RESOURCE_STATE_ON)
+                        break;
+        }
+
+        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n",
+                *state?"on":"off"));
+
+        return_VALUE(result);
+}
+
+
+static int
+acpi_power_on (
+        acpi_handle             handle)
+{
+        int                     result = 0;
+        acpi_status             status = AE_OK;
+        struct acpi_device      *device = NULL;
+        struct acpi_power_resource *resource = NULL;
+
+        ACPI_FUNCTION_TRACE("acpi_power_on");
+
+        result = acpi_power_get_context(handle, &resource);
+        if (result)
+                return_VALUE(result);
+
+        resource->references++;
+
+        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);
+        }
+
+        status = acpi_evaluate_object(resource->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);
+
+        /* 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;
+
+        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned on\n",
+                resource->name));
+
+        return_VALUE(0);
+}
+
+
+static int
+acpi_power_off_device (
+        acpi_handle             handle)
+{
+        int                     result = 0;
+        acpi_status             status = AE_OK;
+        struct acpi_device      *device = NULL;
+        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);
+
+        if (resource->references)
+                resource->references--;
+
+        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->state == ACPI_POWER_RESOURCE_STATE_OFF) {
+                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] already off\n",
+                        device->pnp.bus_id));
+                return_VALUE(0);
+        }
+
+        status = acpi_evaluate_object(resource->handle, "_OFF", 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_OFF)
+                return_VALUE(-ENOEXEC);
+
+        /* 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_D3;
+
+        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned off\n",
+                resource->name));
+
+        return_VALUE(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
+ */
+int acpi_enable_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;
+
+        ACPI_FUNCTION_TRACE("acpi_enable_wakeup_device_power");
+        if (!dev || !dev->wakeup.flags.valid)
+                return_VALUE(-1);
+
+        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]);
+                if (ret) {
+                        ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 
+                                "Error transition power state\n"));
+                        dev->wakeup.flags.valid = 0;
+                        return_VALUE(-1);
+                }
+        }
+
+        /* Execute PSW */
+        status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL);
+        if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluate _PSW\n"));
+                dev->wakeup.flags.valid = 0;
+                ret = -1;
+        }
+
+        return_VALUE(ret);
+}
+
+/*
+ * Shutdown a wakeup device, counterpart of above method
+ * 1. Disable _PSW (power state wake)
+ * 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;
+
+        ACPI_FUNCTION_TRACE("acpi_disable_wakeup_device_power");
+
+        if (!dev || !dev->wakeup.flags.valid)
+                return_VALUE(-1);
+
+        arg.integer.value = 0;  
+        /* Execute PSW */
+        status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL);
+        if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluate _PSW\n"));
+                dev->wakeup.flags.valid = 0;
+                return_VALUE(-1);
+        }
+
+        /* Close power resource */
+        for (i = 0; i < dev->wakeup.resources.count; i++) {
+                ret = acpi_power_off_device(dev->wakeup.resources.handles[i]);
+                if (ret) {
+                        ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 
+                                "Error transition power state\n"));
+                        dev->wakeup.flags.valid = 0;
+                        return_VALUE(-1);
+                }
+        }
+
+        return_VALUE(ret);
+}
+
+/* --------------------------------------------------------------------------
+                             Device Power Management
+   -------------------------------------------------------------------------- */
+
+int
+acpi_power_get_inferred_state (
+        struct acpi_device      *device)
+{
+        int                     result = 0;
+        struct acpi_handle_list *list = NULL;
+        int                     list_state = 0;
+        int                     i = 0;
+
+        ACPI_FUNCTION_TRACE("acpi_power_get_inferred_state");
+
+        if (!device)
+                return_VALUE(-EINVAL);
+
+        device->power.state = ACPI_STATE_UNKNOWN;
+
+        /*
+         * 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;
+
+                result = acpi_power_get_list_state(list, &list_state);
+                if (result)
+                        return_VALUE(result);
+
+                if (list_state == ACPI_POWER_RESOURCE_STATE_ON) {
+                        device->power.state = i;
+                        return_VALUE(0);
+                }
+        }
+
+        device->power.state = ACPI_STATE_D3;
+
+        return_VALUE(0);
+}
+
+
+int
+acpi_power_transition (
+        struct acpi_device      *device,
+        int                     state)
+{
+        int                     result = 0;
+        struct acpi_handle_list *cl = NULL;     /* Current Resources */
+        struct acpi_handle_list *tl = NULL;     /* Target Resources */
+        int                     i = 0;
+
+        ACPI_FUNCTION_TRACE("acpi_power_transition");
+
+        if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
+                return_VALUE(-EINVAL);
+
+        if ((device->power.state < ACPI_STATE_D0) || (device->power.state > ACPI_STATE_D3))
+                return_VALUE(-ENODEV);
+
+        cl = &device->power.states[device->power.state].resources;
+        tl = &device->power.states[state].resources;
+
+        device->power.state = ACPI_STATE_UNKNOWN;
+
+        if (!cl->count && !tl->count) {
+                result = -ENODEV;
+                goto end;
+        }
+
+        /* 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).
+         */
+        for (i=0; i<tl->count; i++) {
+                result = acpi_power_on(tl->handles[i]);
+                if (result)
+                        goto end;
+        }
+
+        /*
+         * Then we dereference all power resources used in the current list.
+         */
+        for (i=0; i<cl->count; i++) {
+                result = acpi_power_off_device(cl->handles[i]);
+                if (result)
+                        goto end;
+        }
+
+        /* We shouldn't change the state till all above operations succeed */
+        device->power.state = state;
+end:
+        if (result)
+                ACPI_DEBUG_PRINT((ACPI_DB_WARN, 
+                        "Error transitioning device [%s] to D%d\n",
+                        device->pnp.bus_id, state));
+
+        return_VALUE(result);
+}
+
+
+/* --------------------------------------------------------------------------
+                              FS Interface (/proc)
+   -------------------------------------------------------------------------- */
+
+static struct proc_dir_entry    *acpi_power_dir;
+
+static int acpi_power_seq_show(struct seq_file *seq, void *offset)
+{
+        struct acpi_power_resource *resource = NULL;
+
+        ACPI_FUNCTION_TRACE("acpi_power_seq_show");
+
+        resource = (struct acpi_power_resource *)seq->private;
+
+        if (!resource)
+                goto end;
+
+        seq_puts(seq, "state:                   ");
+        switch (resource->state) {
+        case ACPI_POWER_RESOURCE_STATE_ON:
+                seq_puts(seq, "on\n");
+                break;
+        case ACPI_POWER_RESOURCE_STATE_OFF:
+                seq_puts(seq, "off\n");
+                break;
+        default:
+                seq_puts(seq, "unknown\n");
+                break;
+        }
+
+        seq_printf(seq, "system level:            S%d\n"
+                        "order:                   %d\n"
+                        "reference count:         %d\n",
+                        resource->system_level,
+                        resource->order,
+                        resource->references);
+
+end:
+        return_VALUE(0);
+}
+
+static int acpi_power_open_fs(struct inode *inode, struct file *file)
+{
+        return single_open(file, acpi_power_seq_show, PDE(inode)->data);
+}
+
+static int
+acpi_power_add_fs (
+        struct acpi_device      *device)
+{
+        struct proc_dir_entry   *entry = NULL;
+
+        ACPI_FUNCTION_TRACE("acpi_power_add_fs");
+
+        if (!device)
+                return_VALUE(-EINVAL);
+
+        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);
+        }
+
+        /* '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->proc_fops = &acpi_power_fops;
+                entry->data = acpi_driver_data(device);
+        }
+
+        return_VALUE(0);
+}
+
+
+static int
+acpi_power_remove_fs (
+        struct acpi_device      *device)
+{
+        ACPI_FUNCTION_TRACE("acpi_power_remove_fs");
+
+        if (acpi_device_dir(device)) {
+                remove_proc_entry(ACPI_POWER_FILE_STATUS,
+                                  acpi_device_dir(device));
+                remove_proc_entry(acpi_device_bid(device), acpi_power_dir);
+                acpi_device_dir(device) = NULL;
+        }
+
+        return_VALUE(0);
+}
+
+
+/* --------------------------------------------------------------------------
+                                Driver Interface
+   -------------------------------------------------------------------------- */
+
+static int
+acpi_power_add (
+        struct acpi_device      *device)
+{
+        int                     result = 0;
+        acpi_status             status = AE_OK;
+        struct acpi_power_resource *resource = NULL;
+        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);
+
+        resource = kmalloc(sizeof(struct acpi_power_resource), GFP_KERNEL);
+        if (!resource)
+                return_VALUE(-ENOMEM);
+        memset(resource, 0, sizeof(struct acpi_power_resource));
+
+        resource->handle = device->handle;
+        strcpy(resource->name, device->pnp.bus_id);
+        strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
+        strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
+        acpi_driver_data(device) = resource;
+
+        /* Evalute the object to get the system level and resource order. */
+        status = acpi_evaluate_object(resource->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);
+        if (result)
+                goto end;
+
+        switch (resource->state) {
+        case ACPI_POWER_RESOURCE_STATE_ON:
+                device->power.state = ACPI_STATE_D0;
+                break;
+        case ACPI_POWER_RESOURCE_STATE_OFF:
+                device->power.state = ACPI_STATE_D3;
+                break;
+        default:
+                device->power.state = ACPI_STATE_UNKNOWN;
+                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");
+
+end:
+        if (result)
+                kfree(resource);
+        
+        return_VALUE(result);
+}
+
+
+static int
+acpi_power_remove (
+        struct acpi_device      *device,
+        int                     type)
+{
+        struct acpi_power_resource *resource = NULL;
+
+        ACPI_FUNCTION_TRACE("acpi_power_remove");
+
+        if (!device || !acpi_driver_data(device))
+                return_VALUE(-EINVAL);
+
+        resource = (struct acpi_power_resource *) acpi_driver_data(device);
+
+        acpi_power_remove_fs(device);
+
+        kfree(resource);
+
+        return_VALUE(0);
+}
+
+
+static int __init acpi_power_init (void)
+{
+        int                     result = 0;
+
+        ACPI_FUNCTION_TRACE("acpi_power_init");
+
+        if (acpi_disabled)
+                return_VALUE(0);
+
+        INIT_LIST_HEAD(&acpi_power_resource_list);
+
+        acpi_power_dir = proc_mkdir(ACPI_POWER_CLASS, acpi_root_dir);
+        if (!acpi_power_dir)
+                return_VALUE(-ENODEV);
+
+        result = acpi_bus_register_driver(&acpi_power_driver);
+        if (result < 0) {
+                remove_proc_entry(ACPI_POWER_CLASS, acpi_root_dir);
+                return_VALUE(-ENODEV);
+        }
+
+        return_VALUE(0);
+}
+
+subsys_initcall(acpi_power_init);
+