PM: Introduce struct pm_subsys_data

Introduce struct pm_subsys_data that may be subclassed by subsystems
to store subsystem-specific information related to the device.  Move
the clock management fields accessed through the power.subsys_data
pointer in struct device to the new strucutre.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

1 files changed, 64 insertions, 58 deletions

diff --git a/drivers/base/power/clock_ops.c b/drivers/base/power/clock_ops.c
index 2c18d584066d..b7f1db4f5945 100644
--- a/drivers/base/power/clock_ops.c
+++ b/drivers/base/power/clock_ops.c
@@ -17,11 +17,6 @@
 
 #ifdef CONFIG_PM
 
-struct pm_clk_data {
-        struct list_head clock_list;
-        spinlock_t lock;
-};
-
 enum pce_status {
         PCE_STATUS_NONE = 0,
         PCE_STATUS_ACQUIRED,
@@ -36,11 +31,6 @@ struct pm_clock_entry {
         enum pce_status status;
 };
 
-static struct pm_clk_data *__to_pcd(struct device *dev)
-{
-        return dev ? dev->power.subsys_data : NULL;
-}
-
 /**
  * pm_clk_add - Start using a device clock for power management.
  * @dev: Device whose clock is going to be used for power management.
@@ -51,10 +41,10 @@ static struct pm_clk_data *__to_pcd(struct device *dev)
  */
 int pm_clk_add(struct device *dev, const char *con_id)
 {
-        struct pm_clk_data *pcd = __to_pcd(dev);
+        struct pm_subsys_data *psd = dev_to_psd(dev);
         struct pm_clock_entry *ce;
 
-        if (!pcd)
+        if (!psd)
                 return -EINVAL;
 
         ce = kzalloc(sizeof(*ce), GFP_KERNEL);
@@ -73,9 +63,9 @@ int pm_clk_add(struct device *dev, const char *con_id)
                 }
         }
 
-        spin_lock_irq(&pcd->lock);
-        list_add_tail(&ce->node, &pcd->clock_list);
-        spin_unlock_irq(&pcd->lock);
+        spin_lock_irq(&psd->lock);
+        list_add_tail(&ce->node, &psd->clock_list);
+        spin_unlock_irq(&psd->lock);
         return 0;
 }
 
@@ -117,15 +107,15 @@ static void __pm_clk_remove(struct pm_clock_entry *ce)
  */
 void pm_clk_remove(struct device *dev, const char *con_id)
 {
-        struct pm_clk_data *pcd = __to_pcd(dev);
+        struct pm_subsys_data *psd = dev_to_psd(dev);
         struct pm_clock_entry *ce;
 
-        if (!pcd)
+        if (!psd)
                 return;
 
-        spin_lock_irq(&pcd->lock);
+        spin_lock_irq(&psd->lock);
 
-        list_for_each_entry(ce, &pcd->clock_list, node) {
+        list_for_each_entry(ce, &psd->clock_list, node) {
                 if (!con_id && !ce->con_id) {
                         __pm_clk_remove(ce);
                         break;
@@ -137,29 +127,45 @@ void pm_clk_remove(struct device *dev, const char *con_id)
                 }
         }
 
-        spin_unlock_irq(&pcd->lock);
+        spin_unlock_irq(&psd->lock);
 }
 
 /**
  * pm_clk_init - Initialize a device's list of power management clocks.
  * @dev: Device to initialize the list of PM clocks for.
  *
- * Allocate a struct pm_clk_data object, initialize its lock member and
- * make the @dev's power.subsys_data field point to it.
+ * Initialize the lock and clock_list members of the device's pm_subsys_data
+ * object.
  */
-int pm_clk_init(struct device *dev)
+void pm_clk_init(struct device *dev)
 {
-        struct pm_clk_data *pcd;
+        struct pm_subsys_data *psd = dev_to_psd(dev);
+
+        if (!psd)
+                return;
 
-        pcd = kzalloc(sizeof(*pcd), GFP_KERNEL);
-        if (!pcd) {
+        INIT_LIST_HEAD(&psd->clock_list);
+        spin_lock_init(&psd->lock);
+}
+
+/**
+ * pm_clk_create - Create and initialize a device's list of PM clocks.
+ * @dev: Device to create and initialize the list of PM clocks for.
+ *
+ * Allocate a struct pm_subsys_data object, initialize its lock and clock_list
+ * members and make the @dev's power.subsys_data field point to it.
+ */
+int pm_clk_create(struct device *dev)
+{
+        struct pm_subsys_data *psd;
+
+        psd = kzalloc(sizeof(*psd), GFP_KERNEL);
+        if (!psd) {
                 dev_err(dev, "Not enough memory for PM clock data.\n");
                 return -ENOMEM;
         }
-
-        INIT_LIST_HEAD(&pcd->clock_list);
-        spin_lock_init(&pcd->lock);
-        dev->power.subsys_data = pcd;
+        dev->power.subsys_data = psd;
+        pm_clk_init(dev);
         return 0;
 }
 
@@ -168,27 +174,27 @@ int pm_clk_init(struct device *dev)
  * @dev: Device to destroy the list of PM clocks for.
  *
  * Clear the @dev's power.subsys_data field, remove the list of clock entries
- * from the struct pm_clk_data object pointed to by it before and free
+ * from the struct pm_subsys_data object pointed to by it before and free
  * that object.
  */
 void pm_clk_destroy(struct device *dev)
 {
-        struct pm_clk_data *pcd = __to_pcd(dev);
+        struct pm_subsys_data *psd = dev_to_psd(dev);
         struct pm_clock_entry *ce, *c;
 
-        if (!pcd)
+        if (!psd)
                 return;
 
         dev->power.subsys_data = NULL;
 
-        spin_lock_irq(&pcd->lock);
+        spin_lock_irq(&psd->lock);
 
-        list_for_each_entry_safe_reverse(ce, c, &pcd->clock_list, node)
+        list_for_each_entry_safe_reverse(ce, c, &psd->clock_list, node)
                 __pm_clk_remove(ce);
 
-        spin_unlock_irq(&pcd->lock);
+        spin_unlock_irq(&psd->lock);
 
-        kfree(pcd);
+        kfree(psd);
 }
 
 #endif /* CONFIG_PM */
@@ -218,18 +224,18 @@ static void pm_clk_acquire(struct device *dev,
  */
 int pm_clk_suspend(struct device *dev)
 {
-        struct pm_clk_data *pcd = __to_pcd(dev);
+        struct pm_subsys_data *psd = dev_to_psd(dev);
         struct pm_clock_entry *ce;
         unsigned long flags;
 
         dev_dbg(dev, "%s()\n", __func__);
 
-        if (!pcd)
+        if (!psd)
                 return 0;
 
-        spin_lock_irqsave(&pcd->lock, flags);
+        spin_lock_irqsave(&psd->lock, flags);
 
-        list_for_each_entry_reverse(ce, &pcd->clock_list, node) {
+        list_for_each_entry_reverse(ce, &psd->clock_list, node) {
                 if (ce->status == PCE_STATUS_NONE)
                         pm_clk_acquire(dev, ce);
 
@@ -239,7 +245,7 @@ int pm_clk_suspend(struct device *dev)
                 }
         }
 
-        spin_unlock_irqrestore(&pcd->lock, flags);
+        spin_unlock_irqrestore(&psd->lock, flags);
 
         return 0;
 }
@@ -250,18 +256,18 @@ int pm_clk_suspend(struct device *dev)
  */
 int pm_clk_resume(struct device *dev)
 {
-        struct pm_clk_data *pcd = __to_pcd(dev);
+        struct pm_subsys_data *psd = dev_to_psd(dev);
         struct pm_clock_entry *ce;
         unsigned long flags;
 
         dev_dbg(dev, "%s()\n", __func__);
 
-        if (!pcd)
+        if (!psd)
                 return 0;
 
-        spin_lock_irqsave(&pcd->lock, flags);
+        spin_lock_irqsave(&psd->lock, flags);
 
-        list_for_each_entry(ce, &pcd->clock_list, node) {
+        list_for_each_entry(ce, &psd->clock_list, node) {
                 if (ce->status == PCE_STATUS_NONE)
                         pm_clk_acquire(dev, ce);
 
@@ -271,7 +277,7 @@ int pm_clk_resume(struct device *dev)
                 }
         }
 
-        spin_unlock_irqrestore(&pcd->lock, flags);
+        spin_unlock_irqrestore(&psd->lock, flags);
 
         return 0;
 }
@@ -309,7 +315,7 @@ static int pm_clk_notify(struct notifier_block *nb,
                 if (dev->pm_domain)
                         break;
 
-                error = pm_clk_init(dev);
+                error = pm_clk_create(dev);
                 if (error)
                         break;
 
@@ -344,22 +350,22 @@ static int pm_clk_notify(struct notifier_block *nb,
  */
 int pm_clk_suspend(struct device *dev)
 {
-        struct pm_clk_data *pcd = __to_pcd(dev);
+        struct pm_subsys_data *psd = dev_to_psd(dev);
         struct pm_clock_entry *ce;
         unsigned long flags;
 
         dev_dbg(dev, "%s()\n", __func__);
 
         /* If there is no driver, the clocks are already disabled. */
-        if (!pcd || !dev->driver)
+        if (!psd || !dev->driver)
                 return 0;
 
-        spin_lock_irqsave(&pcd->lock, flags);
+        spin_lock_irqsave(&psd->lock, flags);
 
-        list_for_each_entry_reverse(ce, &pcd->clock_list, node)
+        list_for_each_entry_reverse(ce, &psd->clock_list, node)
                 clk_disable(ce->clk);
 
-        spin_unlock_irqrestore(&pcd->lock, flags);
+        spin_unlock_irqrestore(&psd->lock, flags);
 
         return 0;
 }
@@ -370,22 +376,22 @@ int pm_clk_suspend(struct device *dev)
  */
 int pm_clk_resume(struct device *dev)
 {
-        struct pm_clk_data *pcd = __to_pcd(dev);
+        struct pm_subsys_data *psd = dev_to_psd(dev);
         struct pm_clock_entry *ce;
         unsigned long flags;
 
         dev_dbg(dev, "%s()\n", __func__);
 
         /* If there is no driver, the clocks should remain disabled. */
-        if (!pcd || !dev->driver)
+        if (!psd || !dev->driver)
                 return 0;
 
-        spin_lock_irqsave(&pcd->lock, flags);
+        spin_lock_irqsave(&psd->lock, flags);
 
-        list_for_each_entry(ce, &pcd->clock_list, node)
+        list_for_each_entry(ce, &psd->clock_list, node)
                 clk_enable(ce->clk);
 
-        spin_unlock_irqrestore(&pcd->lock, flags);
+        spin_unlock_irqrestore(&psd->lock, flags);
 
         return 0;
 }