#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/init.h>
-#include <linux/pm.h>
#include <linux/console.h>
#include <linux/cpu.h>
#include <linux/resume-trace.h>
#include "power.h"
+BLOCKING_NOTIFIER_HEAD(pm_chain_head);
+
/*This is just an arbitrary number */
#define FREE_PAGE_NUMBER (100)
DEFINE_MUTEX(pm_mutex);
struct pm_ops *pm_ops;
-suspend_disk_method_t pm_disk_mode = PM_DISK_SHUTDOWN;
/**
* pm_set_ops - Set the global power method table.
{
mutex_lock(&pm_mutex);
pm_ops = ops;
- if (ops && ops->pm_disk_mode != PM_DISK_INVALID) {
- pm_disk_mode = ops->pm_disk_mode;
- } else
- pm_disk_mode = PM_DISK_SHUTDOWN;
mutex_unlock(&pm_mutex);
}
/**
* suspend_prepare - Do prep work before entering low-power state.
- * @state: State we're entering.
*
- * This is common code that is called for each state that we're
- * entering. Allocate a console, stop all processes, then make sure
- * the platform can enter the requested state.
+ * This is common code that is called for each state that we're entering.
+ * Run suspend notifiers, allocate a console and stop all processes.
*/
-
-static int suspend_prepare(suspend_state_t state)
+static int suspend_prepare(void)
{
int error;
unsigned int free_pages;
if (!pm_ops || !pm_ops->enter)
return -EPERM;
+ error = pm_notifier_call_chain(PM_SUSPEND_PREPARE);
+ if (error)
+ goto Finish;
+
pm_prepare_console();
if (freeze_processes()) {
goto Thaw;
}
- if ((free_pages = global_page_state(NR_FREE_PAGES))
- < FREE_PAGE_NUMBER) {
+ free_pages = global_page_state(NR_FREE_PAGES);
+ if (free_pages < FREE_PAGE_NUMBER) {
pr_debug("PM: free some memory\n");
shrink_all_memory(FREE_PAGE_NUMBER - free_pages);
if (nr_free_pages() < FREE_PAGE_NUMBER) {
error = -ENOMEM;
printk(KERN_ERR "PM: No enough memory\n");
- goto Thaw;
}
}
-
- if (pm_ops->prepare) {
- if ((error = pm_ops->prepare(state)))
- goto Thaw;
- }
-
- suspend_console();
- error = device_suspend(PMSG_SUSPEND);
- if (error) {
- printk(KERN_ERR "Some devices failed to suspend\n");
- goto Resume_devices;
- }
- error = disable_nonboot_cpus();
if (!error)
return 0;
- enable_nonboot_cpus();
- Resume_devices:
- pm_finish(state);
- device_resume();
- resume_console();
Thaw:
thaw_processes();
pm_restore_console();
+ Finish:
+ pm_notifier_call_chain(PM_POST_SUSPEND);
return error;
}
local_irq_enable();
}
+/**
+ * suspend_enter - enter the desired system sleep state.
+ * @state: state to enter
+ *
+ * This function should be called after devices have been suspended.
+ */
int suspend_enter(suspend_state_t state)
{
int error = 0;
return error;
}
+/**
+ * suspend_devices_and_enter - suspend devices and enter the desired system sleep
+ * state.
+ * @state: state to enter
+ */
+int suspend_devices_and_enter(suspend_state_t state)
+{
+ int error;
+
+ if (!pm_ops)
+ return -ENOSYS;
+
+ if (pm_ops->set_target) {
+ error = pm_ops->set_target(state);
+ if (error)
+ return error;
+ }
+ suspend_console();
+ error = device_suspend(PMSG_SUSPEND);
+ if (error) {
+ printk(KERN_ERR "Some devices failed to suspend\n");
+ goto Resume_console;
+ }
+ if (pm_ops->prepare) {
+ error = pm_ops->prepare(state);
+ if (error)
+ goto Resume_devices;
+ }
+ error = disable_nonboot_cpus();
+ if (!error)
+ suspend_enter(state);
+
+ enable_nonboot_cpus();
+ pm_finish(state);
+ Resume_devices:
+ device_resume();
+ Resume_console:
+ resume_console();
+ return error;
+}
/**
* suspend_finish - Do final work before exiting suspend sequence.
- * @state: State we're coming out of.
*
* Call platform code to clean up, restart processes, and free the
* console that we've allocated. This is not called for suspend-to-disk.
*/
-
-static void suspend_finish(suspend_state_t state)
+static void suspend_finish(void)
{
- enable_nonboot_cpus();
- pm_finish(state);
- device_resume();
- resume_console();
thaw_processes();
pm_restore_console();
+ pm_notifier_call_chain(PM_POST_SUSPEND);
}
static const char * const pm_states[PM_SUSPEND_MAX] = {
[PM_SUSPEND_STANDBY] = "standby",
[PM_SUSPEND_MEM] = "mem",
- [PM_SUSPEND_DISK] = "disk",
};
static inline int valid_state(suspend_state_t state)
{
- /* Suspend-to-disk does not really need low-level support.
- * It can work with shutdown/reboot if needed. If it isn't
- * configured, then it cannot be supported.
- */
- if (state == PM_SUSPEND_DISK)
-#ifdef CONFIG_SOFTWARE_SUSPEND
- return 1;
-#else
- return 0;
-#endif
-
- /* all other states need lowlevel support and need to be
- * valid to the lowlevel implementation, no valid callback
+ /* All states need lowlevel support and need to be valid
+ * to the lowlevel implementation, no valid callback
* implies that none are valid. */
if (!pm_ops || !pm_ops->valid || !pm_ops->valid(state))
return 0;
* Then, do the setup for suspend, enter the state, and cleaup (after
* we've woken up).
*/
-
static int enter_state(suspend_state_t state)
{
int error;
if (!mutex_trylock(&pm_mutex))
return -EBUSY;
- if (state == PM_SUSPEND_DISK) {
- error = pm_suspend_disk();
- goto Unlock;
- }
-
pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]);
- if ((error = suspend_prepare(state)))
+ if ((error = suspend_prepare()))
goto Unlock;
pr_debug("PM: Entering %s sleep\n", pm_states[state]);
- error = suspend_enter(state);
+ error = suspend_devices_and_enter(state);
pr_debug("PM: Finishing wakeup.\n");
- suspend_finish(state);
+ suspend_finish();
Unlock:
mutex_unlock(&pm_mutex);
return error;
/**
* pm_suspend - Externally visible function for suspending system.
- * @state: Enumarted value of state to enter.
+ * @state: Enumerated value of state to enter.
*
* Determine whether or not value is within range, get state
* structure, and enter (above).
if (pm_states[i] && valid_state(i))
s += sprintf(s,"%s ", pm_states[i]);
}
- s += sprintf(s,"\n");
+#ifdef CONFIG_SOFTWARE_SUSPEND
+ s += sprintf(s, "%s\n", "disk");
+#else
+ if (s != buf)
+ /* convert the last space to a newline */
+ *(s-1) = '\n';
+#endif
return (s - buf);
}
p = memchr(buf, '\n', n);
len = p ? p - buf : n;
+ /* First, check if we are requested to hibernate */
+ if (len == 4 && !strncmp(buf, "disk", len)) {
+ error = hibernate();
+ return error ? error : n;
+ }
+
for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) {
- if (*s && !strncmp(buf, *s, len))
+ if (*s && len == strlen(*s) && !strncmp(buf, *s, len))
break;
}
if (state < PM_SUSPEND_MAX && *s)
projects / linux-2.6-omap-h63xx.git / blobdiff