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PM / Runtime: Add subsystem data field to struct dev_pm_info

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Some subsystems need to attach PM-related data to struct device and
they need to use devres for this purpose.  For their convenience
and to make code more straightforward, add a new field called
subsys_data to struct dev_pm_info and let subsystems use it for
attaching PM-related information to devices.

Convert the ARM shmobile platform to using the new field.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Rafael J. Wysocki 2011-04-29 00:36:53 +02:00
parent 638080c37a
commit 1d2b71f61b
2 changed files with 18 additions and 17 deletions
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34
arch/arm/mach-shmobile/pm_runtime.c
View File

@ -18,6 +18,7 @@
#include <linux/clk.h>
#include <linux/sh_clk.h>
#include <linux/bitmap.h>
#include <linux/slab.h>
#ifdef CONFIG_PM_RUNTIME
#define BIT_ONCE 0
@ -29,22 +30,9 @@ struct pm_runtime_data {
struct clk *clk;
};
static void __devres_release(struct device *dev, void *res)
{
struct pm_runtime_data *prd = res;
dev_dbg(dev, "__devres_release()\n");
if (test_bit(BIT_CLK_ENABLED, &prd->flags))
clk_disable(prd->clk);
if (test_bit(BIT_ACTIVE, &prd->flags))
clk_put(prd->clk);
}
static struct pm_runtime_data *__to_prd(struct device *dev)
{
return devres_find(dev, __devres_release, NULL, NULL);
return dev ? dev->power.subsys_data : NULL;
}
static void platform_pm_runtime_init(struct device *dev,
@ -121,14 +109,26 @@ static int platform_bus_notify(struct notifier_block *nb,
dev_dbg(dev, "platform_bus_notify() %ld !\n", action);
if (action == BUS_NOTIFY_BIND_DRIVER) {
prd = devres_alloc(__devres_release, sizeof(*prd), GFP_KERNEL);
switch (action) {
case BUS_NOTIFY_BIND_DRIVER:
prd = kzalloc(sizeof(*prd), GFP_KERNEL);
if (prd) {
devres_add(dev, prd);
dev->power.subsys_data = prd;
dev->pwr_domain = &default_power_domain;
} else {
dev_err(dev, "unable to alloc memory for runtime pm\n");
}
break;
case BUS_NOTIFY_UNBOUND_DRIVER:
prd = __to_prd(dev);
if (prd) {
if (test_bit(BIT_CLK_ENABLED, &prd->flags))
clk_disable(prd->clk);
if (test_bit(BIT_ACTIVE, &prd->flags))
clk_put(prd->clk);
}
break;
}
return 0;

1
include/linux/pm.h
View File

@ -460,6 +460,7 @@ struct dev_pm_info {
unsigned long active_jiffies;
unsigned long suspended_jiffies;
unsigned long accounting_timestamp;
void *subsys_data; /* Owned by the subsystem. */
#endif
};