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1da177e4 LT |
1 | /* |
2 | * pm.h - Power management interface | |
3 | * | |
4 | * Copyright (C) 2000 Andrew Henroid | |
5 | * | |
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. | |
10 | * | |
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. | |
15 | * | |
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 | |
19 | */ | |
20 | ||
21 | #ifndef _LINUX_PM_H | |
22 | #define _LINUX_PM_H | |
23 | ||
24 | #ifdef __KERNEL__ | |
25 | ||
1da177e4 LT |
26 | #include <linux/list.h> |
27 | #include <asm/atomic.h> | |
28 | ||
29 | /* | |
30 | * Power management requests... these are passed to pm_send_all() and friends. | |
31 | * | |
32 | * these functions are old and deprecated, see below. | |
33 | */ | |
34 | typedef int __bitwise pm_request_t; | |
35 | ||
36 | #define PM_SUSPEND ((__force pm_request_t) 1) /* enter D1-D3 */ | |
37 | #define PM_RESUME ((__force pm_request_t) 2) /* enter D0 */ | |
38 | ||
39 | ||
40 | /* | |
41 | * Device types... these are passed to pm_register | |
42 | */ | |
43 | typedef int __bitwise pm_dev_t; | |
44 | ||
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 */ | |
52 | ||
53 | /* | |
54 | * System device hardware ID (PnP) values | |
55 | */ | |
56 | enum | |
57 | { | |
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 */ | |
65 | }; | |
66 | ||
67 | /* | |
68 | * Device identifier | |
69 | */ | |
70 | #define PM_PCI_ID(dev) ((dev)->bus->number << 16 | (dev)->devfn) | |
71 | ||
72 | /* | |
73 | * Request handler callback | |
74 | */ | |
75 | struct pm_dev; | |
76 | ||
77 | typedef int (*pm_callback)(struct pm_dev *dev, pm_request_t rqst, void *data); | |
78 | ||
79 | /* | |
80 | * Dynamic device information | |
81 | */ | |
82 | struct pm_dev | |
83 | { | |
84 | pm_dev_t type; | |
85 | unsigned long id; | |
86 | pm_callback callback; | |
87 | void *data; | |
88 | ||
89 | unsigned long flags; | |
90 | unsigned long state; | |
91 | unsigned long prev_state; | |
92 | ||
93 | struct list_head entry; | |
94 | }; | |
95 | ||
1da177e4 LT |
96 | /* Functions above this comment are list-based old-style power |
97 | * managment. Please avoid using them. */ | |
98 | ||
99 | /* | |
100 | * Callbacks for platform drivers to implement. | |
101 | */ | |
102 | extern void (*pm_idle)(void); | |
103 | extern void (*pm_power_off)(void); | |
104 | ||
105 | typedef int __bitwise suspend_state_t; | |
106 | ||
107 | #define PM_SUSPEND_ON ((__force suspend_state_t) 0) | |
108 | #define PM_SUSPEND_STANDBY ((__force suspend_state_t) 1) | |
109 | #define PM_SUSPEND_MEM ((__force suspend_state_t) 3) | |
110 | #define PM_SUSPEND_DISK ((__force suspend_state_t) 4) | |
111 | #define PM_SUSPEND_MAX ((__force suspend_state_t) 5) | |
112 | ||
113 | typedef int __bitwise suspend_disk_method_t; | |
114 | ||
fe0c935a JB |
115 | /* invalid must be 0 so struct pm_ops initialisers can leave it out */ |
116 | #define PM_DISK_INVALID ((__force suspend_disk_method_t) 0) | |
11d77d0c JB |
117 | #define PM_DISK_PLATFORM ((__force suspend_disk_method_t) 1) |
118 | #define PM_DISK_SHUTDOWN ((__force suspend_disk_method_t) 2) | |
119 | #define PM_DISK_REBOOT ((__force suspend_disk_method_t) 3) | |
120 | #define PM_DISK_TEST ((__force suspend_disk_method_t) 4) | |
121 | #define PM_DISK_TESTPROC ((__force suspend_disk_method_t) 5) | |
122 | #define PM_DISK_MAX ((__force suspend_disk_method_t) 6) | |
1da177e4 | 123 | |
2a9df494 JB |
124 | /** |
125 | * struct pm_ops - Callbacks for managing platform dependent suspend states. | |
126 | * @valid: Callback to determine whether the given state can be entered. | |
127 | * If %CONFIG_SOFTWARE_SUSPEND is set then %PM_SUSPEND_DISK is | |
9684e51c JB |
128 | * always valid and never passed to this call. If not assigned, |
129 | * no suspend states are valid. | |
130 | * Valid states are advertised in /sys/power/state but can still | |
131 | * be rejected by prepare or enter if the conditions aren't right. | |
132 | * There is a %pm_valid_only_mem function available that can be assigned | |
133 | * to this if you only implement mem sleep. | |
2a9df494 JB |
134 | * |
135 | * @prepare: Prepare the platform for the given suspend state. Can return a | |
136 | * negative error code if necessary. | |
137 | * | |
138 | * @enter: Enter the given suspend state, must be assigned. Can return a | |
139 | * negative error code if necessary. | |
140 | * | |
141 | * @finish: Called when the system has left the given state and all devices | |
142 | * are resumed. The return value is ignored. | |
143 | * | |
fe0c935a JB |
144 | * @pm_disk_mode: The generic code always allows one of the shutdown methods |
145 | * %PM_DISK_SHUTDOWN, %PM_DISK_REBOOT, %PM_DISK_TEST and | |
146 | * %PM_DISK_TESTPROC. If this variable is set, the mode it is set | |
147 | * to is allowed in addition to those modes and is also made default. | |
148 | * When this mode is sent selected, the @prepare call will be called | |
149 | * before suspending to disk (if present), the @enter call should be | |
150 | * present and will be called after all state has been saved and the | |
151 | * machine is ready to be powered off; the @finish callback is called | |
152 | * after state has been restored. All these calls are called with | |
153 | * %PM_SUSPEND_DISK as the state. | |
2a9df494 | 154 | */ |
1da177e4 | 155 | struct pm_ops { |
eb9289eb | 156 | int (*valid)(suspend_state_t state); |
1da177e4 LT |
157 | int (*prepare)(suspend_state_t state); |
158 | int (*enter)(suspend_state_t state); | |
159 | int (*finish)(suspend_state_t state); | |
2a9df494 | 160 | suspend_disk_method_t pm_disk_mode; |
1da177e4 LT |
161 | }; |
162 | ||
2a9df494 JB |
163 | /** |
164 | * pm_set_ops - set platform dependent power management ops | |
165 | * @pm_ops: The new power management operations to set. | |
166 | */ | |
167 | extern void pm_set_ops(struct pm_ops *pm_ops); | |
e2a5b420 | 168 | extern struct pm_ops *pm_ops; |
1da177e4 LT |
169 | extern int pm_suspend(suspend_state_t state); |
170 | ||
e8c9c502 | 171 | extern int pm_valid_only_mem(suspend_state_t state); |
1da177e4 | 172 | |
a53c46dc JB |
173 | /** |
174 | * arch_suspend_disable_irqs - disable IRQs for suspend | |
175 | * | |
176 | * Disables IRQs (in the default case). This is a weak symbol in the common | |
177 | * code and thus allows architectures to override it if more needs to be | |
178 | * done. Not called for suspend to disk. | |
179 | */ | |
180 | extern void arch_suspend_disable_irqs(void); | |
181 | ||
182 | /** | |
183 | * arch_suspend_enable_irqs - enable IRQs after suspend | |
184 | * | |
185 | * Enables IRQs (in the default case). This is a weak symbol in the common | |
186 | * code and thus allows architectures to override it if more needs to be | |
187 | * done. Not called for suspend to disk. | |
188 | */ | |
189 | extern void arch_suspend_enable_irqs(void); | |
190 | ||
1da177e4 LT |
191 | /* |
192 | * Device power management | |
193 | */ | |
194 | ||
195 | struct device; | |
196 | ||
ca078bae PM |
197 | typedef struct pm_message { |
198 | int event; | |
199 | } pm_message_t; | |
1da177e4 LT |
200 | |
201 | /* | |
82bb67f2 DB |
202 | * Several driver power state transitions are externally visible, affecting |
203 | * the state of pending I/O queues and (for drivers that touch hardware) | |
204 | * interrupts, wakeups, DMA, and other hardware state. There may also be | |
205 | * internal transitions to various low power modes, which are transparent | |
206 | * to the rest of the driver stack (such as a driver that's ON gating off | |
207 | * clocks which are not in active use). | |
1da177e4 | 208 | * |
82bb67f2 DB |
209 | * One transition is triggered by resume(), after a suspend() call; the |
210 | * message is implicit: | |
211 | * | |
212 | * ON Driver starts working again, responding to hardware events | |
213 | * and software requests. The hardware may have gone through | |
214 | * a power-off reset, or it may have maintained state from the | |
215 | * previous suspend() which the driver will rely on while | |
216 | * resuming. On most platforms, there are no restrictions on | |
217 | * availability of resources like clocks during resume(). | |
218 | * | |
219 | * Other transitions are triggered by messages sent using suspend(). All | |
220 | * these transitions quiesce the driver, so that I/O queues are inactive. | |
221 | * That commonly entails turning off IRQs and DMA; there may be rules | |
222 | * about how to quiesce that are specific to the bus or the device's type. | |
223 | * (For example, network drivers mark the link state.) Other details may | |
224 | * differ according to the message: | |
225 | * | |
226 | * SUSPEND Quiesce, enter a low power device state appropriate for | |
227 | * the upcoming system state (such as PCI_D3hot), and enable | |
228 | * wakeup events as appropriate. | |
229 | * | |
230 | * FREEZE Quiesce operations so that a consistent image can be saved; | |
231 | * but do NOT otherwise enter a low power device state, and do | |
232 | * NOT emit system wakeup events. | |
233 | * | |
234 | * PRETHAW Quiesce as if for FREEZE; additionally, prepare for restoring | |
235 | * the system from a snapshot taken after an earlier FREEZE. | |
236 | * Some drivers will need to reset their hardware state instead | |
237 | * of preserving it, to ensure that it's never mistaken for the | |
238 | * state which that earlier snapshot had set up. | |
239 | * | |
240 | * A minimally power-aware driver treats all messages as SUSPEND, fully | |
241 | * reinitializes its device during resume() -- whether or not it was reset | |
242 | * during the suspend/resume cycle -- and can't issue wakeup events. | |
243 | * | |
244 | * More power-aware drivers may also use low power states at runtime as | |
245 | * well as during system sleep states like PM_SUSPEND_STANDBY. They may | |
246 | * be able to use wakeup events to exit from runtime low-power states, | |
247 | * or from system low-power states such as standby or suspend-to-RAM. | |
1da177e4 LT |
248 | */ |
249 | ||
ca078bae PM |
250 | #define PM_EVENT_ON 0 |
251 | #define PM_EVENT_FREEZE 1 | |
252 | #define PM_EVENT_SUSPEND 2 | |
82bb67f2 | 253 | #define PM_EVENT_PRETHAW 3 |
ca078bae PM |
254 | |
255 | #define PMSG_FREEZE ((struct pm_message){ .event = PM_EVENT_FREEZE, }) | |
82bb67f2 | 256 | #define PMSG_PRETHAW ((struct pm_message){ .event = PM_EVENT_PRETHAW, }) |
ca078bae PM |
257 | #define PMSG_SUSPEND ((struct pm_message){ .event = PM_EVENT_SUSPEND, }) |
258 | #define PMSG_ON ((struct pm_message){ .event = PM_EVENT_ON, }) | |
1da177e4 LT |
259 | |
260 | struct dev_pm_info { | |
261 | pm_message_t power_state; | |
0ac85241 | 262 | unsigned can_wakeup:1; |
1da177e4 | 263 | #ifdef CONFIG_PM |
0ac85241 | 264 | unsigned should_wakeup:1; |
1da177e4 LT |
265 | pm_message_t prev_state; |
266 | void * saved_state; | |
1da177e4 LT |
267 | struct device * pm_parent; |
268 | struct list_head entry; | |
269 | #endif | |
270 | }; | |
271 | ||
272 | extern void device_pm_set_parent(struct device * dev, struct device * parent); | |
273 | ||
1da177e4 LT |
274 | extern int device_power_down(pm_message_t state); |
275 | extern void device_power_up(void); | |
276 | extern void device_resume(void); | |
277 | ||
620b0327 | 278 | #ifdef CONFIG_PM |
74c7e2ef RD |
279 | extern suspend_disk_method_t pm_disk_mode; |
280 | ||
620b0327 | 281 | extern int device_suspend(pm_message_t state); |
7c8265f5 | 282 | extern int device_prepare_suspend(pm_message_t state); |
0ac85241 DB |
283 | |
284 | #define device_set_wakeup_enable(dev,val) \ | |
285 | ((dev)->power.should_wakeup = !!(val)) | |
286 | #define device_may_wakeup(dev) \ | |
287 | (device_can_wakeup(dev) && (dev)->power.should_wakeup) | |
288 | ||
9a7834d0 AM |
289 | extern int dpm_runtime_suspend(struct device *, pm_message_t); |
290 | extern void dpm_runtime_resume(struct device *); | |
02669492 AM |
291 | extern void __suspend_report_result(const char *function, void *fn, int ret); |
292 | ||
293 | #define suspend_report_result(fn, ret) \ | |
294 | do { \ | |
295 | __suspend_report_result(__FUNCTION__, fn, ret); \ | |
296 | } while (0) | |
9a7834d0 | 297 | |
075c1771 DB |
298 | /* |
299 | * Platform hook to activate device wakeup capability, if that's not already | |
300 | * handled by enable_irq_wake() etc. | |
301 | * Returns zero on success, else negative errno | |
302 | */ | |
303 | extern int (*platform_enable_wakeup)(struct device *dev, int is_on); | |
304 | ||
305 | static inline int call_platform_enable_wakeup(struct device *dev, int is_on) | |
306 | { | |
307 | if (platform_enable_wakeup) | |
308 | return (*platform_enable_wakeup)(dev, is_on); | |
309 | return 0; | |
310 | } | |
311 | ||
0ac85241 DB |
312 | #else /* !CONFIG_PM */ |
313 | ||
620b0327 PM |
314 | static inline int device_suspend(pm_message_t state) |
315 | { | |
316 | return 0; | |
317 | } | |
0ac85241 DB |
318 | |
319 | #define device_set_wakeup_enable(dev,val) do{}while(0) | |
320 | #define device_may_wakeup(dev) (0) | |
321 | ||
9a7834d0 AM |
322 | static inline int dpm_runtime_suspend(struct device * dev, pm_message_t state) |
323 | { | |
324 | return 0; | |
325 | } | |
326 | ||
327 | static inline void dpm_runtime_resume(struct device * dev) | |
328 | { | |
9a7834d0 AM |
329 | } |
330 | ||
02669492 AM |
331 | #define suspend_report_result(fn, ret) do { } while (0) |
332 | ||
075c1771 DB |
333 | static inline int call_platform_enable_wakeup(struct device *dev, int is_on) |
334 | { | |
14e38ac8 | 335 | return 0; |
075c1771 DB |
336 | } |
337 | ||
620b0327 | 338 | #endif |
1da177e4 | 339 | |
0ac85241 DB |
340 | /* changes to device_may_wakeup take effect on the next pm state change. |
341 | * by default, devices should wakeup if they can. | |
342 | */ | |
343 | #define device_can_wakeup(dev) \ | |
344 | ((dev)->power.can_wakeup) | |
345 | #define device_init_wakeup(dev,val) \ | |
346 | do { \ | |
347 | device_can_wakeup(dev) = !!(val); \ | |
348 | device_set_wakeup_enable(dev,val); \ | |
349 | } while(0) | |
350 | ||
1da177e4 LT |
351 | #endif /* __KERNEL__ */ |
352 | ||
353 | #endif /* _LINUX_PM_H */ |