Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes...

[safe/jmp/linux-2.6] / drivers / i2c / i2c-core.c

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 9065c72..3202a86 100644 (file)
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -34,6 +34,7 @@
 #include <linux/hardirq.h>
 #include <linux/irqflags.h>
 #include <linux/rwsem.h>
+#include <linux/pm_runtime.h>
 #include <asm/uaccess.h>
 
 #include "i2c-core.h"
@@ -155,6 +156,81 @@ static void i2c_device_shutdown(struct device *dev)
                driver->shutdown(client);
 }
 
+#ifdef CONFIG_SUSPEND
+static int i2c_device_pm_suspend(struct device *dev)
+{
+       const struct dev_pm_ops *pm;
+
+       if (!dev->driver)
+               return 0;
+       pm = dev->driver->pm;
+       if (!pm || !pm->suspend)
+               return 0;
+       return pm->suspend(dev);
+}
+
+static int i2c_device_pm_resume(struct device *dev)
+{
+       const struct dev_pm_ops *pm;
+
+       if (!dev->driver)
+               return 0;
+       pm = dev->driver->pm;
+       if (!pm || !pm->resume)
+               return 0;
+       return pm->resume(dev);
+}
+#else
+#define i2c_device_pm_suspend  NULL
+#define i2c_device_pm_resume   NULL
+#endif
+
+#ifdef CONFIG_PM_RUNTIME
+static int i2c_device_runtime_suspend(struct device *dev)
+{
+       const struct dev_pm_ops *pm;
+
+       if (!dev->driver)
+               return 0;
+       pm = dev->driver->pm;
+       if (!pm || !pm->runtime_suspend)
+               return 0;
+       return pm->runtime_suspend(dev);
+}
+
+static int i2c_device_runtime_resume(struct device *dev)
+{
+       const struct dev_pm_ops *pm;
+
+       if (!dev->driver)
+               return 0;
+       pm = dev->driver->pm;
+       if (!pm || !pm->runtime_resume)
+               return 0;
+       return pm->runtime_resume(dev);
+}
+
+static int i2c_device_runtime_idle(struct device *dev)
+{
+       const struct dev_pm_ops *pm = NULL;
+       int ret;
+
+       if (dev->driver)
+               pm = dev->driver->pm;
+       if (pm && pm->runtime_idle) {
+               ret = pm->runtime_idle(dev);
+               if (ret)
+                       return ret;
+       }
+
+       return pm_runtime_suspend(dev);
+}
+#else
+#define i2c_device_runtime_suspend     NULL
+#define i2c_device_runtime_resume      NULL
+#define i2c_device_runtime_idle                NULL
+#endif
+
 static int i2c_device_suspend(struct device *dev, pm_message_t mesg)
 {
        struct i2c_client *client = i2c_verify_client(dev);
@@ -219,6 +295,14 @@ static const struct attribute_group *i2c_dev_attr_groups[] = {
        NULL
 };
 
+static const struct dev_pm_ops i2c_device_pm_ops = {
+       .suspend = i2c_device_pm_suspend,
+       .resume = i2c_device_pm_resume,
+       .runtime_suspend = i2c_device_runtime_suspend,
+       .runtime_resume = i2c_device_runtime_resume,
+       .runtime_idle = i2c_device_runtime_idle,
+};
+
 struct bus_type i2c_bus_type = {
        .name           = "i2c",
        .match          = i2c_device_match,
@@ -227,6 +311,7 @@ struct bus_type i2c_bus_type = {
        .shutdown       = i2c_device_shutdown,
        .suspend        = i2c_device_suspend,
        .resume         = i2c_device_resume,
+       .pm             = &i2c_device_pm_ops,
 };
 EXPORT_SYMBOL_GPL(i2c_bus_type);
 
@@ -808,6 +893,9 @@ int i2c_del_adapter(struct i2c_adapter *adap)
                                 adap->dev.parent);
 #endif
 
+       /* device name is gone after device_unregister */
+       dev_dbg(&adap->dev, "adapter [%s] unregistered\n", adap->name);
+
        /* clean up the sysfs representation */
        init_completion(&adap->dev_released);
        device_unregister(&adap->dev);
@@ -820,8 +908,6 @@ int i2c_del_adapter(struct i2c_adapter *adap)
        idr_remove(&i2c_adapter_idr, adap->nr);
        mutex_unlock(&core_lock);
 
-       dev_dbg(&adap->dev, "adapter [%s] unregistered\n", adap->name);
-
        /* Clear the device structure in case this adapter is ever going to be
           added again */
        memset(&adap->dev, 0, sizeof(adap->dev));
@@ -1097,7 +1183,7 @@ EXPORT_SYMBOL(i2c_transfer);
  * i2c_master_send - issue a single I2C message in master transmit mode
  * @client: Handle to slave device
  * @buf: Data that will be written to the slave
- * @count: How many bytes to write
+ * @count: How many bytes to write, must be less than 64k since msg.len is u16
  *
  * Returns negative errno, or else the number of bytes written.
  */
@@ -1124,7 +1210,7 @@ EXPORT_SYMBOL(i2c_master_send);
  * i2c_master_recv - issue a single I2C message in master receive mode
  * @client: Handle to slave device
  * @buf: Where to store data read from slave
- * @count: How many bytes to read
+ * @count: How many bytes to read, must be less than 64k since msg.len is u16
  *
  * Returns negative errno, or else the number of bytes read.
  */