Re: [PATCH 0/4]Bind physical devices with ACPI devices - take 2
From: Li Shaohua
Date: Mon Jan 17 2005 - 03:00:57 EST
On Wed, 2005-01-05 at 10:50, Li Shaohua wrote:
> Hi,
> The series of patches implement binding physical devices with ACPI
> devices. With it, device drivers can utilize methods provided by
> firmware (ACPI). These patches are against 2.6.10, please give your
> comments.
Hi,
This is updated patches according to latest discussion.
Changes from last one:
1. introduce new field 'firmware_data' in 'struct device', since people
complain rename 'platform_data. Greg, could you please check if the
comments I added in 'struct device' are correct?
2. align to Pavel's latest PCI state convention work.
3. Some cleanups and add more comments.
One issue is 'platform_pci_choose_state' doesn't get called, it should
be after Pavel updates the parameter of 'pci_choose_state'
Thanks,
Shaohua
This patch implemented the framework for binding physical devices with ACPI
devices. A physical bus like PCI bus should create a 'acpi_bus_type'.
The method in 'acpi_bus_type':
.find_device:
For device which has parent such as normal PCI devices.
.find_bridge:
It's for special devices, such as PCI root bridge and IDE controller.
such devices generally haven't parent or ->bus. We use the special method
to get an ACPI handle.
---
2.5-root/drivers/acpi/Makefile | 2
2.5-root/drivers/acpi/glue.c | 360 +++++++++++++++++++++++++++++++++++++++
2.5-root/drivers/acpi/ibm_acpi.c | 4
2.5-root/include/acpi/acpi_bus.h | 21 ++
2.5-root/include/linux/device.h | 6
5 files changed, 388 insertions(+), 5 deletions(-)
diff -puN /dev/null drivers/acpi/glue.c
--- /dev/null 2004-02-24 05:02:56.000000000 +0800
+++ 2.5-root/drivers/acpi/glue.c 2005-01-17 12:52:16.825046520 +0800
@@ -0,0 +1,360 @@
+/*
+ * Link physical devices with ACPI devices support
+ */
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/device.h>
+#include <linux/rwsem.h>
+#include <linux/acpi.h>
+
+#define ACPI_GLUE_DEBUG 0
+#if ACPI_GLUE_DEBUG
+#define DBG(x...) printk(PREFIX x)
+#else
+#define DBG(x...)
+#endif
+static LIST_HEAD(bus_type_list);
+static DECLARE_RWSEM(bus_type_sem);
+
+int register_acpi_bus_type(struct acpi_bus_type *type)
+{
+ if (acpi_disabled)
+ return -ENODEV;
+ if (type && type->bus && type->find_device) {
+ down_write(&bus_type_sem);
+ list_add_tail(&type->list, &bus_type_list);
+ up_write(&bus_type_sem);
+ DBG("ACPI bus type %s registered\n", type->bus->name);
+ return 0;
+ }
+ return -ENODEV;
+}
+EXPORT_SYMBOL(register_acpi_bus_type);
+
+int unregister_acpi_bus_type(struct acpi_bus_type *type)
+{
+ if (acpi_disabled)
+ return 0;
+ if (type) {
+ down_write(&bus_type_sem);
+ list_del_init(&type->list);
+ up_write(&bus_type_sem);
+ DBG("ACPI bus type %s unregistered\n", type->bus->name);
+ return 0;
+ }
+ return -ENODEV;
+}
+EXPORT_SYMBOL(unregister_acpi_bus_type);
+
+static struct acpi_bus_type *
+acpi_get_bus_type(struct bus_type *type)
+{
+ struct acpi_bus_type *tmp, *ret = NULL;
+
+ down_read(&bus_type_sem);
+ list_for_each_entry(tmp, &bus_type_list, list) {
+ if (tmp->bus == type) {
+ ret = tmp;
+ break;
+ }
+ }
+ up_read(&bus_type_sem);
+ return ret;
+}
+
+static int
+acpi_find_bridge_device(struct device *dev, acpi_handle *handle)
+{
+ struct acpi_bus_type *tmp;
+ int ret = -ENODEV;
+
+ down_read(&bus_type_sem);
+ list_for_each_entry(tmp, &bus_type_list, list) {
+ if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) {
+ ret = 0;
+ break;
+ }
+ }
+ up_read(&bus_type_sem);
+ return ret;
+}
+
+/* Get PCI root bridge's handle from its segment and bus number */
+struct acpi_find_pci_root {
+ unsigned int seg;
+ unsigned int bus;
+ acpi_handle handle;
+};
+
+static acpi_status
+do_root_bridge_busnr_callback (struct acpi_resource *resource, void *data)
+{
+ int *busnr = (int *)data;
+ struct acpi_resource_address64 address;
+
+ if (resource->id != ACPI_RSTYPE_ADDRESS16 &&
+ resource->id != ACPI_RSTYPE_ADDRESS32 &&
+ resource->id != ACPI_RSTYPE_ADDRESS64)
+ return AE_OK;
+
+ acpi_resource_to_address64(resource, &address);
+ if ((address.address_length > 0) &&
+ (address.resource_type == ACPI_BUS_NUMBER_RANGE))
+ *busnr = address.min_address_range;
+
+ return AE_OK;
+}
+
+static int
+get_root_bridge_busnr(acpi_handle handle)
+{
+ acpi_status status;
+ int bus, bbn;
+ struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
+
+ acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
+
+ status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, NULL,
+ (unsigned long *)&bbn);
+ if (status == AE_NOT_FOUND) {
+ /* Assume bus = 0 */
+ printk(KERN_INFO PREFIX
+ "Assume root bridge [%s] bus is 0\n",
+ (char *)buffer.pointer);
+ status = AE_OK;
+ bbn = 0;
+ }
+ if (ACPI_FAILURE(status)) {
+ bbn = -ENODEV;
+ goto exit;
+ }
+ if (bbn > 0)
+ goto exit;
+
+ /* _BBN in some systems return 0 for all root bridges */
+ bus = -1;
+ status = acpi_walk_resources(handle, METHOD_NAME__CRS,
+ do_root_bridge_busnr_callback, &bus);
+ /* If _CRS failed, we just use _BBN */
+ if (ACPI_FAILURE(status) || (bus == -1))
+ goto exit;
+ /* We select _CRS */
+ if (bbn != bus) {
+ printk(KERN_INFO PREFIX
+ "_BBN and _CRS returns different value for %s. Select _CRS\n",
+ (char*)buffer.pointer);
+ bbn = bus;
+ }
+exit:
+ acpi_os_free(buffer.pointer);
+ return bbn;
+}
+
+static acpi_status
+find_pci_rootbridge(acpi_handle handle, u32 lvl, void *context, void **rv)
+{
+ struct acpi_find_pci_root *find = (struct acpi_find_pci_root *)context;
+ unsigned long seg, bus;
+ acpi_status status;
+ int tmp;
+ struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
+
+ acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
+
+ status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL,
+ &seg);
+ if (status == AE_NOT_FOUND) {
+ /* Assume seg = 0 */
+ printk(KERN_INFO PREFIX
+ "Assume root bridge [%s] segment is 0\n",
+ (char *)buffer.pointer);
+ status = AE_OK;
+ seg = 0;
+ }
+ if (ACPI_FAILURE(status)) {
+ status = AE_CTRL_DEPTH;
+ goto exit;
+ }
+
+ tmp = get_root_bridge_busnr(handle);
+ if (tmp < 0) {
+ printk(KERN_ERR PREFIX
+ "Find root bridge failed for %s\n",
+ (char*)buffer.pointer);
+ status = AE_CTRL_DEPTH;
+ goto exit;
+ }
+ bus = tmp;
+
+ if (seg == find->seg && bus == find->bus)
+ find->handle = handle;
+ status = AE_OK;
+exit:
+ acpi_os_free(buffer.pointer);
+ return status;
+}
+
+acpi_handle
+acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
+{
+ struct acpi_find_pci_root find = {seg, bus, NULL};
+
+ acpi_get_devices(PCI_ROOT_HID_STRING,
+ find_pci_rootbridge,
+ &find,
+ NULL);
+ return find.handle;
+}
+
+/* Get device's handler per its address under its parent */
+struct acpi_find_child {
+ acpi_handle handle;
+ acpi_integer address;
+};
+
+static acpi_status
+do_acpi_find_child(acpi_handle handle, u32 lvl, void *context, void **rv)
+{
+ acpi_status status;
+ struct acpi_device_info *info;
+ struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
+ struct acpi_find_child *find = (struct acpi_find_child*)context;
+
+ status = acpi_get_object_info(handle, &buffer);
+ if (ACPI_SUCCESS(status)) {
+ info = buffer.pointer;
+ if (info->address == find->address)
+ find->handle = handle;
+ acpi_os_free(buffer.pointer);
+ }
+ return AE_OK;
+}
+
+acpi_handle
+acpi_get_child(acpi_handle parent, acpi_integer address)
+{
+ struct acpi_find_child find = {NULL, address};
+
+ if (!parent)
+ return NULL;
+ acpi_walk_namespace(ACPI_TYPE_DEVICE, parent,
+ 1, do_acpi_find_child,
+ &find, NULL);
+ return find.handle;
+}
+EXPORT_SYMBOL(acpi_get_child);
+
+/* Link ACPI devices with physical devices */
+static void acpi_glue_data_handler(acpi_handle handle,
+ u32 function, void *context)
+{
+ /* we provide an empty handler */
+}
+
+/* Note: a success call will increase reference count by one */
+struct device *acpi_get_physical_device(acpi_handle handle)
+{
+ acpi_status status;
+ struct device *dev;
+
+ status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev);
+ if (ACPI_SUCCESS(status))
+ return get_device(dev);
+ return NULL;
+}
+EXPORT_SYMBOL(acpi_get_physical_device);
+
+static int acpi_bind_one(struct device *dev, acpi_handle handle)
+{
+ acpi_status status;
+
+ if (dev->firmware_data) {
+ printk(KERN_WARNING PREFIX
+ "Drivers changed 'firmware_data' for %s\n", dev->bus_id);
+ return -EINVAL;
+ }
+ get_device(dev);
+ status = acpi_attach_data(handle, acpi_glue_data_handler, dev);
+ if (ACPI_FAILURE(status)) {
+ put_device(dev);
+ return -EINVAL;
+ }
+ dev->firmware_data = handle;
+
+ return 0;
+}
+
+static int acpi_unbind_one(struct device *dev)
+{
+ if (!dev->firmware_data)
+ return 0;
+ if (dev == acpi_get_physical_device(dev->firmware_data)) {
+ /* acpi_get_physical_device increase refcnt by one */
+ put_device(dev);
+ acpi_detach_data(dev->firmware_data, acpi_glue_data_handler);
+ dev->firmware_data = NULL;
+ /* acpi_bind_one increase refcnt by one */
+ put_device(dev);
+ } else {
+ printk(KERN_ERR PREFIX
+ "Oops, 'firmware_data' corrupt for %s\n", dev->bus_id);
+ }
+ return 0;
+}
+
+static int acpi_platform_notify (struct device *dev)
+{
+ struct acpi_bus_type *type;
+ acpi_handle handle;
+ int ret = -EINVAL;
+
+ if (!dev->bus || !dev->parent) {
+ /* bridge devices genernally haven't bus or parent */
+ ret = acpi_find_bridge_device(dev, &handle);
+ goto end;
+ }
+ type = acpi_get_bus_type(dev->bus);
+ if (!type) {
+ printk(KERN_INFO PREFIX "No ACPI bus support for %s\n", dev->bus_id);
+ ret = -EINVAL;
+ goto end;
+ }
+ if ((ret = type->find_device(dev, &handle)) != 0)
+ printk(KERN_INFO PREFIX "Can't get handler for %s\n", dev->bus_id);
+end:
+ if (!ret)
+ acpi_bind_one(dev, handle);
+
+#if ACPI_GLUE_DEBUG
+ if (!ret) {
+ struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
+
+ acpi_get_name(dev->firmware_data, ACPI_FULL_PATHNAME, &buffer);
+ DBG("Device %s -> %s\n", dev->bus_id, (char *)buffer.pointer);
+ acpi_os_free(buffer.pointer);
+ } else
+ DBG("Device %s -> No ACPI support\n", dev->bus_id);
+#endif
+
+ return ret;
+}
+
+static int acpi_platform_notify_remove(struct device *dev)
+{
+ acpi_unbind_one(dev);
+ return 0;
+}
+
+static int __init init_acpi_device_notify(void)
+{
+ if (acpi_disabled)
+ return 0;
+ if (platform_notify || platform_notify_remove) {
+ printk(KERN_ERR PREFIX "Can't use platform_notify\n");
+ return 0;
+ }
+ platform_notify = acpi_platform_notify;
+ platform_notify_remove = acpi_platform_notify_remove;
+ return 0;
+}
+arch_initcall(init_acpi_device_notify);
diff -puN drivers/acpi/ibm_acpi.c~bind-acpi-devcore drivers/acpi/ibm_acpi.c
--- 2.5/drivers/acpi/ibm_acpi.c~bind-acpi-devcore 2005-01-17 12:52:16.815048040 +0800
+++ 2.5-root/drivers/acpi/ibm_acpi.c 2005-01-17 12:52:16.826046368 +0800
@@ -1025,7 +1025,7 @@ static int setup_notify(struct ibm_struc
return 0;
}
-static int device_add(struct acpi_device *device)
+static int ibmacpi_device_add(struct acpi_device *device)
{
return 0;
}
@@ -1043,7 +1043,7 @@ static int register_driver(struct ibm_st
memset(ibm->driver, 0, sizeof(struct acpi_driver));
sprintf(ibm->driver->name, "%s/%s", IBM_NAME, ibm->name);
ibm->driver->ids = ibm->hid;
- ibm->driver->ops.add = &device_add;
+ ibm->driver->ops.add = &ibmacpi_device_add;
ret = acpi_bus_register_driver(ibm->driver);
if (ret < 0) {
diff -puN drivers/acpi/Makefile~bind-acpi-devcore drivers/acpi/Makefile
--- 2.5/drivers/acpi/Makefile~bind-acpi-devcore 2005-01-17 12:52:16.817047736 +0800
+++ 2.5-root/drivers/acpi/Makefile 2005-01-17 12:52:16.826046368 +0800
@@ -36,7 +36,7 @@ processor-objs += processor_perflib.o
endif
obj-$(CONFIG_ACPI_BUS) += sleep/
-obj-$(CONFIG_ACPI_BUS) += bus.o
+obj-$(CONFIG_ACPI_BUS) += bus.o glue.o
obj-$(CONFIG_ACPI_AC) += ac.o
obj-$(CONFIG_ACPI_BATTERY) += battery.o
obj-$(CONFIG_ACPI_BUTTON) += button.o
diff -puN include/acpi/acpi_bus.h~bind-acpi-devcore include/acpi/acpi_bus.h
--- 2.5/include/acpi/acpi_bus.h~bind-acpi-devcore 2005-01-17 12:52:16.818047584 +0800
+++ 2.5-root/include/acpi/acpi_bus.h 2005-01-17 12:52:16.826046368 +0800
@@ -337,6 +337,27 @@ int acpi_match_ids (struct acpi_device *
int acpi_create_dir(struct acpi_device *);
void acpi_remove_dir(struct acpi_device *);
+
+/*
+ * Bind physical devices with ACPI devices
+ */
+#include <linux/device.h>
+struct acpi_bus_type {
+ struct list_head list;
+ struct bus_type *bus;
+ /* For general devices under the bus*/
+ int (*find_device)(struct device *, acpi_handle*);
+ /* For bridges, such as PCI root bridge, IDE controller */
+ int (*find_bridge)(struct device *, acpi_handle *);
+};
+int register_acpi_bus_type(struct acpi_bus_type *);
+int unregister_acpi_bus_type(struct acpi_bus_type *);
+struct device *acpi_get_physical_device(acpi_handle);
+/* helper */
+acpi_handle acpi_get_child(acpi_handle, acpi_integer);
+acpi_handle acpi_get_pci_rootbridge_handle(unsigned int, unsigned int);
+#define DEVICE_ACPI_HANDLE(dev) ((acpi_handle)((dev)->firmware_data))
+
#endif /*CONFIG_ACPI_BUS*/
#endif /*__ACPI_BUS_H__*/
diff -puN include/linux/device.h~bind-acpi-devcore include/linux/device.h
--- 2.5/include/linux/device.h~bind-acpi-devcore 2005-01-17 12:52:16.820047280 +0800
+++ 2.5-root/include/linux/device.h 2005-01-17 12:52:16.827046216 +0800
@@ -268,8 +268,10 @@ struct device {
struct device_driver *driver; /* which driver has allocated this
device */
void *driver_data; /* data private to the driver */
- void *platform_data; /* Platform specific data (e.g. ACPI,
- BIOS data relevant to device) */
+ void *platform_data; /* Platform specific data, device
+ core doesn't touch it */
+ void *firmware_data; /* Firmware specific data (e.g. ACPI,
+ BIOS data),reserved for device core*/
struct dev_pm_info power;
u32 detach_state; /* State to enter when device is
_
An implementation for binding ACPI devices with PCI devices.
---
2.5-root/drivers/pci/pci-acpi.c | 50 ++++++++++++++++++++++++++++++++++++++++
1 files changed, 50 insertions(+)
diff -puN drivers/pci/pci-acpi.c~bind-acpi-pci drivers/pci/pci-acpi.c
--- 2.5/drivers/pci/pci-acpi.c~bind-acpi-pci 2005-01-17 12:52:50.100987808 +0800
+++ 2.5-root/drivers/pci/pci-acpi.c 2005-01-17 12:53:52.365522160 +0800
@@ -207,3 +207,53 @@ acpi_status pci_osc_control_set(u32 flag
return status;
}
EXPORT_SYMBOL(pci_osc_control_set);
+
+/* ACPI bus type */
+static int pci_acpi_find_device(struct device *dev, acpi_handle *handle)
+{
+ struct pci_dev * pci_dev;
+ acpi_integer addr;
+
+ pci_dev = to_pci_dev(dev);
+ /* Please ref to ACPI spec for the syntax of _ADR */
+ addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
+ *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
+ if (!*handle)
+ return -ENODEV;
+ return 0;
+}
+
+static int pci_acpi_find_root_bridge(struct device *dev, acpi_handle *handle)
+{
+ int num;
+ unsigned int seg, bus;
+
+ /*
+ * The string should be the same as root bridge's name
+ * Please look at 'pci_scan_bus_parented'
+ */
+ num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus);
+ if (num != 2)
+ return -ENODEV;
+ *handle = acpi_get_pci_rootbridge_handle(seg, bus);
+ if (!*handle)
+ return -ENODEV;
+ return 0;
+}
+
+static struct acpi_bus_type pci_acpi_bus = {
+ .bus = &pci_bus_type,
+ .find_device = pci_acpi_find_device,
+ .find_bridge = pci_acpi_find_root_bridge,
+};
+
+static int __init pci_acpi_init(void)
+{
+ int ret;
+
+ ret = register_acpi_bus_type(&pci_acpi_bus);
+ if (ret)
+ return 0;
+ return 0;
+}
+arch_initcall(pci_acpi_init);
_
An ACPI callback for getting suspend state
---
2.5-root/drivers/pci/pci-acpi.c | 22 ++++++++++++++++++++++
2.5-root/drivers/pci/pci.c | 1 +
2.5-root/drivers/pci/pci.h | 4 ++++
3 files changed, 27 insertions(+)
diff -puN drivers/pci/pci-acpi.c~acpi-pci-get-suspend-state-callback drivers/pci/pci-acpi.c
--- 2.5/drivers/pci/pci-acpi.c~acpi-pci-get-suspend-state-callback 2005-01-17 12:54:05.355547376 +0800
+++ 2.5-root/drivers/pci/pci-acpi.c 2005-01-17 13:09:46.266507168 +0800
@@ -16,6 +16,7 @@
#include <acpi/acpi_bus.h>
#include <linux/pci-acpi.h>
+#include "pci.h"
static u32 ctrlset_buf[3] = {0, 0, 0};
static u32 global_ctrlsets = 0;
@@ -208,6 +209,25 @@ acpi_status pci_osc_control_set(u32 flag
}
EXPORT_SYMBOL(pci_osc_control_set);
+static int acpi_pci_choose_state(struct pci_dev *pdev,
+ pm_message_t state)
+{
+ char dstate_str[] = "_S0D";
+ acpi_status status;
+ unsigned long val;
+ struct device *dev = &pdev->dev;
+
+ /* state is PM_SUSPEND_* */
+ if ((state >= PM_SUSPEND_MAX) || !DEVICE_ACPI_HANDLE(dev))
+ return -EINVAL;
+ dstate_str[2] += (int __force)state;
+ status = acpi_evaluate_integer(DEVICE_ACPI_HANDLE(dev), dstate_str,
+ NULL, &val);
+ if (ACPI_SUCCESS(status))
+ return val;
+ return -EINVAL;;
+}
+
/* ACPI bus type */
static int pci_acpi_find_device(struct device *dev, acpi_handle *handle)
{
@@ -254,6 +274,8 @@ static int __init pci_acpi_init(void)
ret = register_acpi_bus_type(&pci_acpi_bus);
if (ret)
return 0;
+ if (!platform_pci_choose_state)
+ platform_pci_choose_state = acpi_pci_choose_state;
return 0;
}
arch_initcall(pci_acpi_init);
diff -puN drivers/pci/pci.c~acpi-pci-get-suspend-state-callback drivers/pci/pci.c
--- 2.5/drivers/pci/pci.c~acpi-pci-get-suspend-state-callback 2005-01-17 12:54:05.357547072 +0800
+++ 2.5-root/drivers/pci/pci.c 2005-01-17 13:08:50.835933896 +0800
@@ -317,6 +317,7 @@ pci_set_power_state(struct pci_dev *dev,
* Returns PCI power state suitable for given device and given system
* message.
*/
+int (*platform_pci_choose_state)(struct pci_dev *, pm_message_t) = 0;
pci_power_t pci_choose_state(struct pci_dev *dev, u32 state)
{
diff -puN drivers/pci/pci.h~acpi-pci-get-suspend-state-callback drivers/pci/pci.h
--- 2.5/drivers/pci/pci.h~acpi-pci-get-suspend-state-callback 2005-01-17 12:54:05.358546920 +0800
+++ 2.5-root/drivers/pci/pci.h 2005-01-17 13:08:50.835933896 +0800
@@ -11,6 +11,10 @@ extern int pci_bus_alloc_resource(struct
void (*alignf)(void *, struct resource *,
unsigned long, unsigned long),
void *alignf_data);
+/* return >= 0 if platform can get correct suspend state */
+extern int (*platform_pci_choose_state)(struct pci_dev *pdev,
+ pm_message_t state);
+
/* PCI /proc functions */
#ifdef CONFIG_PROC_FS
extern int pci_proc_attach_device(struct pci_dev *dev);
_
---
2.5-root/drivers/acpi/bus.c | 7 +++++++
2.5-root/drivers/pci/pci-acpi.c | 15 +++++++++++++++
2.5-root/drivers/pci/pci.c | 9 +++++++++
2.5-root/drivers/pci/pci.h | 3 +++
4 files changed, 34 insertions(+)
diff -puN drivers/acpi/bus.c~acpi-pci-set-power-state-callback drivers/acpi/bus.c
--- 2.5/drivers/acpi/bus.c~acpi-pci-set-power-state-callback 2005-01-17 13:09:51.308740632 +0800
+++ 2.5-root/drivers/acpi/bus.c 2005-01-17 13:09:51.316739416 +0800
@@ -212,6 +212,13 @@ acpi_bus_set_power (
ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Device is not power manageable\n"));
return_VALUE(-ENODEV);
}
+ /*
+ * Get device's current power state if it's unknown
+ * This means device power state isn't initialized
+ * or previous setting failed
+ */
+ if (device->power.state == ACPI_STATE_UNKNOWN)
+ acpi_bus_get_power(device->handle, &device->power.state);
if (state == device->power.state) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n", state));
return_VALUE(0);
diff -puN drivers/pci/pci-acpi.c~acpi-pci-set-power-state-callback drivers/pci/pci-acpi.c
--- 2.5/drivers/pci/pci-acpi.c~acpi-pci-set-power-state-callback 2005-01-17 13:09:51.309740480 +0800
+++ 2.5-root/drivers/pci/pci-acpi.c 2005-01-17 13:09:51.316739416 +0800
@@ -228,6 +228,19 @@ static int acpi_pci_choose_state(struct
return -EINVAL;;
}
+static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
+{
+ acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
+ int acpi_state;
+
+ if (!handle)
+ return -ENODEV;
+ acpi_state = (int __force)state;
+ if (state == PCI_D3cold)
+ acpi_state = 3;
+ return acpi_bus_set_power(handle, acpi_state);
+}
+
/* ACPI bus type */
static int pci_acpi_find_device(struct device *dev, acpi_handle *handle)
{
@@ -276,6 +289,8 @@ static int __init pci_acpi_init(void)
return 0;
if (!platform_pci_choose_state)
platform_pci_choose_state = acpi_pci_choose_state;
+ if (!platform_pci_set_power_state)
+ platform_pci_set_power_state = acpi_pci_set_power_state;
return 0;
}
arch_initcall(pci_acpi_init);
diff -puN drivers/pci/pci.c~acpi-pci-set-power-state-callback drivers/pci/pci.c
--- 2.5/drivers/pci/pci.c~acpi-pci-set-power-state-callback 2005-01-17 13:09:51.311740176 +0800
+++ 2.5-root/drivers/pci/pci.c 2005-01-17 13:09:51.317739264 +0800
@@ -240,6 +240,7 @@ pci_find_parent_resource(const struct pc
* -EIO if device does not support PCI PM.
* 0 if we can successfully change the power state.
*/
+int (*platform_pci_set_power_state)(struct pci_dev*, pci_power_t) = NULL;
int
pci_set_power_state(struct pci_dev *dev, pci_power_t state)
@@ -304,6 +305,14 @@ pci_set_power_state(struct pci_dev *dev,
msleep(10);
else if (state == PCI_D2 || dev->current_state == PCI_D2)
udelay(200);
+
+ /*
+ * Give firmware a chance to be called, such as ACPI _PRx, _PSx
+ * Firmware method after natice method ?
+ */
+ if (platform_pci_set_power_state)
+ platform_pci_set_power_state(dev, state);
+
dev->current_state = state;
return 0;
diff -puN drivers/pci/pci.h~acpi-pci-set-power-state-callback drivers/pci/pci.h
--- 2.5/drivers/pci/pci.h~acpi-pci-set-power-state-callback 2005-01-17 13:09:51.312740024 +0800
+++ 2.5-root/drivers/pci/pci.h 2005-01-17 13:11:19.458339856 +0800
@@ -14,6 +14,9 @@ extern int pci_bus_alloc_resource(struct
/* return >= 0 if platform can get correct suspend state */
extern int (*platform_pci_choose_state)(struct pci_dev *pdev,
pm_message_t state);
+/* return 0 if success, < 0 failed */
+extern int (*platform_pci_set_power_state)(struct pci_dev *pdev,
+ pci_power_t state);
/* PCI /proc functions */
#ifdef CONFIG_PROC_FS
_