2 * pm.h - Power management interface
4 * Copyright (C) 2000 Andrew Henroid
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 #include <linux/list.h>
27 #include <asm/atomic.h>
30 * Power management requests... these are passed to pm_send_all() and friends.
32 * these functions are old and deprecated, see below.
34 typedef int __bitwise pm_request_t;
36 #define PM_SUSPEND ((__force pm_request_t) 1) /* enter D1-D3 */
37 #define PM_RESUME ((__force pm_request_t) 2) /* enter D0 */
41 * Device types... these are passed to pm_register
43 typedef int __bitwise pm_dev_t;
45 #define PM_UNKNOWN_DEV ((__force pm_dev_t) 0) /* generic */
46 #define PM_SYS_DEV ((__force pm_dev_t) 1) /* system device (fan, KB controller, ...) */
47 #define PM_PCI_DEV ((__force pm_dev_t) 2) /* PCI device */
48 #define PM_USB_DEV ((__force pm_dev_t) 3) /* USB device */
49 #define PM_SCSI_DEV ((__force pm_dev_t) 4) /* SCSI device */
50 #define PM_ISA_DEV ((__force pm_dev_t) 5) /* ISA device */
51 #define PM_MTD_DEV ((__force pm_dev_t) 6) /* Memory Technology Device */
54 * System device hardware ID (PnP) values
58 PM_SYS_UNKNOWN = 0x00000000, /* generic */
59 PM_SYS_KBC = 0x41d00303, /* keyboard controller */
60 PM_SYS_COM = 0x41d00500, /* serial port */
61 PM_SYS_IRDA = 0x41d00510, /* IRDA controller */
62 PM_SYS_FDC = 0x41d00700, /* floppy controller */
63 PM_SYS_VGA = 0x41d00900, /* VGA controller */
64 PM_SYS_PCMCIA = 0x41d00e00, /* PCMCIA controller */
70 #define PM_PCI_ID(dev) ((dev)->bus->number << 16 | (dev)->devfn)
73 * Request handler callback
77 typedef int (*pm_callback)(struct pm_dev *dev, pm_request_t rqst, void *data);
80 * Dynamic device information
91 unsigned long prev_state;
93 struct list_head entry;
96 /* Functions above this comment are list-based old-style power
97 * managment. Please avoid using them. */
100 * Callbacks for platform drivers to implement.
102 extern void (*pm_idle)(void);
103 extern void (*pm_power_off)(void);
104 extern void (*pm_power_off_prepare)(void);
106 typedef int __bitwise suspend_state_t;
108 #define PM_SUSPEND_ON ((__force suspend_state_t) 0)
109 #define PM_SUSPEND_STANDBY ((__force suspend_state_t) 1)
110 #define PM_SUSPEND_MEM ((__force suspend_state_t) 3)
111 #define PM_SUSPEND_MAX ((__force suspend_state_t) 4)
114 * struct pm_ops - Callbacks for managing platform dependent system sleep
117 * @valid: Callback to determine if given system sleep state is supported by
119 * Valid (ie. supported) states are advertised in /sys/power/state. Note
120 * that it still may be impossible to enter given system sleep state if the
121 * conditions aren't right.
122 * There is the %pm_valid_only_mem function available that can be assigned
123 * to this if the platform only supports mem sleep.
125 * @set_target: Tell the platform which system sleep state is going to be
127 * @set_target() is executed right prior to suspending devices. The
128 * information conveyed to the platform code by @set_target() should be
129 * disregarded by the platform as soon as @finish() is executed and if
130 * @prepare() fails. If @set_target() fails (ie. returns nonzero),
131 * @prepare(), @enter() and @finish() will not be called by the PM core.
132 * This callback is optional. However, if it is implemented, the argument
133 * passed to @prepare(), @enter() and @finish() is meaningless and should
136 * @prepare: Prepare the platform for entering the system sleep state indicated
137 * by @set_target() or represented by the argument if @set_target() is not
139 * @prepare() is called right after devices have been suspended (ie. the
140 * appropriate .suspend() method has been executed for each device) and
141 * before the nonboot CPUs are disabled (it is executed with IRQs enabled).
142 * This callback is optional. It returns 0 on success or a negative
143 * error code otherwise, in which case the system cannot enter the desired
144 * sleep state (@enter() and @finish() will not be called in that case).
146 * @enter: Enter the system sleep state indicated by @set_target() or
147 * represented by the argument if @set_target() is not implemented.
148 * This callback is mandatory. It returns 0 on success or a negative
149 * error code otherwise, in which case the system cannot enter the desired
152 * @finish: Called when the system has just left a sleep state, right after
153 * the nonboot CPUs have been enabled and before devices are resumed (it is
154 * executed with IRQs enabled). If @set_target() is not implemented, the
155 * argument represents the sleep state being left.
156 * This callback is optional, but should be implemented by the platforms
157 * that implement @prepare(). If implemented, it is always called after
158 * @enter() (even if @enter() fails).
161 int (*valid)(suspend_state_t state);
162 int (*set_target)(suspend_state_t state);
163 int (*prepare)(suspend_state_t state);
164 int (*enter)(suspend_state_t state);
165 int (*finish)(suspend_state_t state);
168 extern struct pm_ops *pm_ops;
171 * pm_set_ops - set platform dependent power management ops
172 * @pm_ops: The new power management operations to set.
174 extern void pm_set_ops(struct pm_ops *pm_ops);
175 extern int pm_valid_only_mem(suspend_state_t state);
178 * arch_suspend_disable_irqs - disable IRQs for suspend
180 * Disables IRQs (in the default case). This is a weak symbol in the common
181 * code and thus allows architectures to override it if more needs to be
182 * done. Not called for suspend to disk.
184 extern void arch_suspend_disable_irqs(void);
187 * arch_suspend_enable_irqs - enable IRQs after suspend
189 * Enables IRQs (in the default case). This is a weak symbol in the common
190 * code and thus allows architectures to override it if more needs to be
191 * done. Not called for suspend to disk.
193 extern void arch_suspend_enable_irqs(void);
195 extern int pm_suspend(suspend_state_t state);
198 * Device power management
203 typedef struct pm_message {
208 * Several driver power state transitions are externally visible, affecting
209 * the state of pending I/O queues and (for drivers that touch hardware)
210 * interrupts, wakeups, DMA, and other hardware state. There may also be
211 * internal transitions to various low power modes, which are transparent
212 * to the rest of the driver stack (such as a driver that's ON gating off
213 * clocks which are not in active use).
215 * One transition is triggered by resume(), after a suspend() call; the
216 * message is implicit:
218 * ON Driver starts working again, responding to hardware events
219 * and software requests. The hardware may have gone through
220 * a power-off reset, or it may have maintained state from the
221 * previous suspend() which the driver will rely on while
222 * resuming. On most platforms, there are no restrictions on
223 * availability of resources like clocks during resume().
225 * Other transitions are triggered by messages sent using suspend(). All
226 * these transitions quiesce the driver, so that I/O queues are inactive.
227 * That commonly entails turning off IRQs and DMA; there may be rules
228 * about how to quiesce that are specific to the bus or the device's type.
229 * (For example, network drivers mark the link state.) Other details may
230 * differ according to the message:
232 * SUSPEND Quiesce, enter a low power device state appropriate for
233 * the upcoming system state (such as PCI_D3hot), and enable
234 * wakeup events as appropriate.
236 * FREEZE Quiesce operations so that a consistent image can be saved;
237 * but do NOT otherwise enter a low power device state, and do
238 * NOT emit system wakeup events.
240 * PRETHAW Quiesce as if for FREEZE; additionally, prepare for restoring
241 * the system from a snapshot taken after an earlier FREEZE.
242 * Some drivers will need to reset their hardware state instead
243 * of preserving it, to ensure that it's never mistaken for the
244 * state which that earlier snapshot had set up.
246 * A minimally power-aware driver treats all messages as SUSPEND, fully
247 * reinitializes its device during resume() -- whether or not it was reset
248 * during the suspend/resume cycle -- and can't issue wakeup events.
250 * More power-aware drivers may also use low power states at runtime as
251 * well as during system sleep states like PM_SUSPEND_STANDBY. They may
252 * be able to use wakeup events to exit from runtime low-power states,
253 * or from system low-power states such as standby or suspend-to-RAM.
256 #define PM_EVENT_ON 0
257 #define PM_EVENT_FREEZE 1
258 #define PM_EVENT_SUSPEND 2
259 #define PM_EVENT_PRETHAW 3
261 #define PMSG_FREEZE ((struct pm_message){ .event = PM_EVENT_FREEZE, })
262 #define PMSG_PRETHAW ((struct pm_message){ .event = PM_EVENT_PRETHAW, })
263 #define PMSG_SUSPEND ((struct pm_message){ .event = PM_EVENT_SUSPEND, })
264 #define PMSG_ON ((struct pm_message){ .event = PM_EVENT_ON, })
267 pm_message_t power_state;
268 unsigned can_wakeup:1;
270 unsigned should_wakeup:1;
271 struct list_head entry;
275 extern int device_power_down(pm_message_t state);
276 extern void device_power_up(void);
277 extern void device_resume(void);
280 extern int device_suspend(pm_message_t state);
281 extern int device_prepare_suspend(pm_message_t state);
283 #define device_set_wakeup_enable(dev,val) \
284 ((dev)->power.should_wakeup = !!(val))
285 #define device_may_wakeup(dev) \
286 (device_can_wakeup(dev) && (dev)->power.should_wakeup)
288 extern void __suspend_report_result(const char *function, void *fn, int ret);
290 #define suspend_report_result(fn, ret) \
292 __suspend_report_result(__FUNCTION__, fn, ret); \
296 * Platform hook to activate device wakeup capability, if that's not already
297 * handled by enable_irq_wake() etc.
298 * Returns zero on success, else negative errno
300 extern int (*platform_enable_wakeup)(struct device *dev, int is_on);
302 static inline int call_platform_enable_wakeup(struct device *dev, int is_on)
304 if (platform_enable_wakeup)
305 return (*platform_enable_wakeup)(dev, is_on);
309 #else /* !CONFIG_PM */
311 static inline int device_suspend(pm_message_t state)
316 #define device_set_wakeup_enable(dev,val) do{}while(0)
317 #define device_may_wakeup(dev) (0)
319 #define suspend_report_result(fn, ret) do { } while (0)
321 static inline int call_platform_enable_wakeup(struct device *dev, int is_on)
328 /* changes to device_may_wakeup take effect on the next pm state change.
329 * by default, devices should wakeup if they can.
331 #define device_can_wakeup(dev) \
332 ((dev)->power.can_wakeup)
333 #define device_init_wakeup(dev,val) \
335 device_can_wakeup(dev) = !!(val); \
336 device_set_wakeup_enable(dev,val); \
339 #endif /* __KERNEL__ */
341 #endif /* _LINUX_PM_H */