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authorMark Brown <broonie@opensource.wolfsonmicro.com>2010-12-25 17:32:27 +0300
committerRafael J. Wysocki <rjw@sisk.pl>2010-12-25 17:32:27 +0300
commit3ae22e8c8ac39daf88ae32f047fb23825be7c646 (patch)
tree20e7ed1005b39e65d99ac351776e74a9c925a6aa /drivers/spi
parent62bcb91573425975d6ad2389d7ab1d8feca88ab4 (diff)
downloadlinux-3ae22e8c8ac39daf88ae32f047fb23825be7c646.tar.xz
spi / PM: Support dev_pm_ops
Allow SPI drivers to use runtime PM and other dev_pm_ops features by implementing dev_pm_ops for the bus. The existing bus specific suspend and resume functions will be called if a driver does not provide dev_pm_ops allowing for transition to the new model. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi.c92
1 files changed, 84 insertions, 8 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index b02d0cbce890..34bb17f03019 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -28,6 +28,7 @@
#include <linux/mod_devicetable.h>
#include <linux/spi/spi.h>
#include <linux/of_spi.h>
+#include <linux/pm_runtime.h>
static void spidev_release(struct device *dev)
{
@@ -100,9 +101,8 @@ static int spi_uevent(struct device *dev, struct kobj_uevent_env *env)
return 0;
}
-#ifdef CONFIG_PM
-
-static int spi_suspend(struct device *dev, pm_message_t message)
+#ifdef CONFIG_PM_SLEEP
+static int spi_legacy_suspend(struct device *dev, pm_message_t message)
{
int value = 0;
struct spi_driver *drv = to_spi_driver(dev->driver);
@@ -117,7 +117,7 @@ static int spi_suspend(struct device *dev, pm_message_t message)
return value;
}
-static int spi_resume(struct device *dev)
+static int spi_legacy_resume(struct device *dev)
{
int value = 0;
struct spi_driver *drv = to_spi_driver(dev->driver);
@@ -132,18 +132,94 @@ static int spi_resume(struct device *dev)
return value;
}
+static int spi_pm_suspend(struct device *dev)
+{
+ const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+
+ if (pm)
+ return pm_generic_suspend(dev);
+ else
+ return spi_legacy_suspend(dev, PMSG_SUSPEND);
+}
+
+static int spi_pm_resume(struct device *dev)
+{
+ const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+
+ if (pm)
+ return pm_generic_resume(dev);
+ else
+ return spi_legacy_resume(dev);
+}
+
+static int spi_pm_freeze(struct device *dev)
+{
+ const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+
+ if (pm)
+ return pm_generic_freeze(dev);
+ else
+ return spi_legacy_suspend(dev, PMSG_FREEZE);
+}
+
+static int spi_pm_thaw(struct device *dev)
+{
+ const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+
+ if (pm)
+ return pm_generic_thaw(dev);
+ else
+ return spi_legacy_resume(dev);
+}
+
+static int spi_pm_poweroff(struct device *dev)
+{
+ const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+
+ if (pm)
+ return pm_generic_poweroff(dev);
+ else
+ return spi_legacy_suspend(dev, PMSG_HIBERNATE);
+}
+
+static int spi_pm_restore(struct device *dev)
+{
+ const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+
+ if (pm)
+ return pm_generic_restore(dev);
+ else
+ return spi_legacy_resume(dev);
+}
#else
-#define spi_suspend NULL
-#define spi_resume NULL
+#define spi_pm_suspend NULL
+#define spi_pm_resume NULL
+#define spi_pm_freeze NULL
+#define spi_pm_thaw NULL
+#define spi_pm_poweroff NULL
+#define spi_pm_restore NULL
#endif
+static const struct dev_pm_ops spi_pm = {
+ .suspend = spi_pm_suspend,
+ .resume = spi_pm_resume,
+ .freeze = spi_pm_freeze,
+ .thaw = spi_pm_thaw,
+ .poweroff = spi_pm_poweroff,
+ .restore = spi_pm_restore,
+ SET_RUNTIME_PM_OPS(
+ pm_generic_runtime_suspend,
+ pm_generic_runtime_resume,
+ pm_generic_runtime_idle
+ )
+};
+
struct bus_type spi_bus_type = {
.name = "spi",
.dev_attrs = spi_dev_attrs,
.match = spi_match_device,
.uevent = spi_uevent,
- .suspend = spi_suspend,
- .resume = spi_resume,
+ .pm = &spi_pm,
};
EXPORT_SYMBOL_GPL(spi_bus_type);