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-rw-r--r--Documentation/power/pci.txt35
1 files changed, 2 insertions, 33 deletions
diff --git a/Documentation/power/pci.txt b/Documentation/power/pci.txt
index c85428e7ad92..35b1a7dae342 100644
--- a/Documentation/power/pci.txt
+++ b/Documentation/power/pci.txt
@@ -165,40 +165,9 @@ Description:
165These functions are intended for use by individual drivers, and are defined in 165These functions are intended for use by individual drivers, and are defined in
166struct pci_driver: 166struct pci_driver:
167 167
168 int (*save_state) (struct pci_dev *dev, u32 state); 168 int (*suspend) (struct pci_dev *dev, pm_message_t state);
169 int (*suspend) (struct pci_dev *dev, u32 state);
170 int (*resume) (struct pci_dev *dev); 169 int (*resume) (struct pci_dev *dev);
171 int (*enable_wake) (struct pci_dev *dev, u32 state, int enable); 170 int (*enable_wake) (struct pci_dev *dev, pci_power_t state, int enable);
172
173
174save_state
175----------
176
177Usage:
178
179if (dev->driver && dev->driver->save_state)
180 dev->driver->save_state(dev,state);
181
182The driver should use this callback to save device state. It should take into
183account the current state of the device and the requested state in order to
184avoid any unnecessary operations.
185
186For example, a video card that supports all 4 states (D0-D3), all controller
187context is preserved when entering D1, but the screen is placed into a low power
188state (blanked).
189
190The driver can also interpret this function as a notification that it may be
191entering a sleep state in the near future. If it knows that the device cannot
192enter the requested state, either because of lack of support for it, or because
193the device is middle of some critical operation, then it should fail.
194
195This function should not be used to set any state in the device or the driver
196because the device may not actually enter the sleep state (e.g. another driver
197later causes causes a global state transition to fail).
198
199Note that in intermediate low power states, a device's I/O and memory spaces may
200be disabled and may not be available in subsequent transitions to lower power
201states.
202 171
203 172
204suspend 173suspend