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>
28 #include <asm/errno.h>
31 * Power management requests... these are passed to pm_send_all() and friends.
33 * these functions are old and deprecated, see below.
35 typedef int __bitwise pm_request_t;
37 #define PM_SUSPEND ((__force pm_request_t) 1) /* enter D1-D3 */
38 #define PM_RESUME ((__force pm_request_t) 2) /* enter D0 */
42 * Device types... these are passed to pm_register
44 typedef int __bitwise pm_dev_t;
46 #define PM_UNKNOWN_DEV ((__force pm_dev_t) 0) /* generic */
47 #define PM_SYS_DEV ((__force pm_dev_t) 1) /* system device (fan, KB controller, ...) */
48 #define PM_PCI_DEV ((__force pm_dev_t) 2) /* PCI device */
49 #define PM_USB_DEV ((__force pm_dev_t) 3) /* USB device */
50 #define PM_SCSI_DEV ((__force pm_dev_t) 4) /* SCSI device */
51 #define PM_ISA_DEV ((__force pm_dev_t) 5) /* ISA device */
52 #define PM_MTD_DEV ((__force pm_dev_t) 6) /* Memory Technology Device */
55 * System device hardware ID (PnP) values
59 PM_SYS_UNKNOWN = 0x00000000, /* generic */
60 PM_SYS_KBC = 0x41d00303, /* keyboard controller */
61 PM_SYS_COM = 0x41d00500, /* serial port */
62 PM_SYS_IRDA = 0x41d00510, /* IRDA controller */
63 PM_SYS_FDC = 0x41d00700, /* floppy controller */
64 PM_SYS_VGA = 0x41d00900, /* VGA controller */
65 PM_SYS_PCMCIA = 0x41d00e00, /* PCMCIA controller */
71 #define PM_PCI_ID(dev) ((dev)->bus->number << 16 | (dev)->devfn)
74 * Request handler callback
78 typedef int (*pm_callback)(struct pm_dev *dev, pm_request_t rqst, void *data);
81 * Dynamic device information
92 unsigned long prev_state;
94 struct list_head entry;
97 /* Functions above this comment are list-based old-style power
98 * management. Please avoid using them. */
101 * Callbacks for platform drivers to implement.
103 extern void (*pm_idle)(void);
104 extern void (*pm_power_off)(void);
105 extern void (*pm_power_off_prepare)(void);
108 * Device power management
113 typedef struct pm_message {
118 * Several driver power state transitions are externally visible, affecting
119 * the state of pending I/O queues and (for drivers that touch hardware)
120 * interrupts, wakeups, DMA, and other hardware state. There may also be
121 * internal transitions to various low power modes, which are transparent
122 * to the rest of the driver stack (such as a driver that's ON gating off
123 * clocks which are not in active use).
125 * One transition is triggered by resume(), after a suspend() call; the
126 * message is implicit:
128 * ON Driver starts working again, responding to hardware events
129 * and software requests. The hardware may have gone through
130 * a power-off reset, or it may have maintained state from the
131 * previous suspend() which the driver will rely on while
132 * resuming. On most platforms, there are no restrictions on
133 * availability of resources like clocks during resume().
135 * Other transitions are triggered by messages sent using suspend(). All
136 * these transitions quiesce the driver, so that I/O queues are inactive.
137 * That commonly entails turning off IRQs and DMA; there may be rules
138 * about how to quiesce that are specific to the bus or the device's type.
139 * (For example, network drivers mark the link state.) Other details may
140 * differ according to the message:
142 * SUSPEND Quiesce, enter a low power device state appropriate for
143 * the upcoming system state (such as PCI_D3hot), and enable
144 * wakeup events as appropriate.
146 * HIBERNATE Enter a low power device state appropriate for the hibernation
147 * state (eg. ACPI S4) and enable wakeup events as appropriate.
149 * FREEZE Quiesce operations so that a consistent image can be saved;
150 * but do NOT otherwise enter a low power device state, and do
151 * NOT emit system wakeup events.
153 * PRETHAW Quiesce as if for FREEZE; additionally, prepare for restoring
154 * the system from a snapshot taken after an earlier FREEZE.
155 * Some drivers will need to reset their hardware state instead
156 * of preserving it, to ensure that it's never mistaken for the
157 * state which that earlier snapshot had set up.
159 * A minimally power-aware driver treats all messages as SUSPEND, fully
160 * reinitializes its device during resume() -- whether or not it was reset
161 * during the suspend/resume cycle -- and can't issue wakeup events.
163 * More power-aware drivers may also use low power states at runtime as
164 * well as during system sleep states like PM_SUSPEND_STANDBY. They may
165 * be able to use wakeup events to exit from runtime low-power states,
166 * or from system low-power states such as standby or suspend-to-RAM.
169 #define PM_EVENT_ON 0
170 #define PM_EVENT_FREEZE 1
171 #define PM_EVENT_SUSPEND 2
172 #define PM_EVENT_HIBERNATE 4
173 #define PM_EVENT_PRETHAW 8
175 #define PM_EVENT_SLEEP (PM_EVENT_SUSPEND | PM_EVENT_HIBERNATE)
177 #define PMSG_FREEZE ((struct pm_message){ .event = PM_EVENT_FREEZE, })
178 #define PMSG_PRETHAW ((struct pm_message){ .event = PM_EVENT_PRETHAW, })
179 #define PMSG_SUSPEND ((struct pm_message){ .event = PM_EVENT_SUSPEND, })
180 #define PMSG_HIBERNATE ((struct pm_message){ .event = PM_EVENT_HIBERNATE, })
181 #define PMSG_ON ((struct pm_message){ .event = PM_EVENT_ON, })
184 pm_message_t power_state;
185 unsigned can_wakeup:1;
186 #ifdef CONFIG_PM_SLEEP
187 unsigned should_wakeup:1;
188 struct list_head entry;
192 extern int device_power_down(pm_message_t state);
193 extern void device_power_up(void);
194 extern void device_resume(void);
196 #ifdef CONFIG_PM_SLEEP
197 extern int device_suspend(pm_message_t state);
198 extern int device_prepare_suspend(pm_message_t state);
200 #define device_set_wakeup_enable(dev,val) \
201 ((dev)->power.should_wakeup = !!(val))
202 #define device_may_wakeup(dev) \
203 (device_can_wakeup(dev) && (dev)->power.should_wakeup)
205 extern void __suspend_report_result(const char *function, void *fn, int ret);
207 #define suspend_report_result(fn, ret) \
209 __suspend_report_result(__FUNCTION__, fn, ret); \
213 * Platform hook to activate device wakeup capability, if that's not already
214 * handled by enable_irq_wake() etc.
215 * Returns zero on success, else negative errno
217 extern int (*platform_enable_wakeup)(struct device *dev, int is_on);
219 static inline int call_platform_enable_wakeup(struct device *dev, int is_on)
221 if (platform_enable_wakeup)
222 return (*platform_enable_wakeup)(dev, is_on);
226 #else /* !CONFIG_PM_SLEEP */
228 static inline int device_suspend(pm_message_t state)
233 #define device_set_wakeup_enable(dev,val) do{}while(0)
234 #define device_may_wakeup(dev) (0)
236 #define suspend_report_result(fn, ret) do { } while (0)
238 static inline int call_platform_enable_wakeup(struct device *dev, int is_on)
243 #endif /* !CONFIG_PM_SLEEP */
245 /* changes to device_may_wakeup take effect on the next pm state change.
246 * by default, devices should wakeup if they can.
248 #define device_can_wakeup(dev) \
249 ((dev)->power.can_wakeup)
250 #define device_init_wakeup(dev,val) \
252 device_can_wakeup(dev) = !!(val); \
253 device_set_wakeup_enable(dev,val); \
257 * Global Power Management flags
258 * Used to keep APM and ACPI from both being active
260 extern unsigned int pm_flags;
265 #endif /* __KERNEL__ */
267 #endif /* _LINUX_PM_H */