Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
new file mode 100644
index 0000000..373a3a9
--- /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);
+