mfd: Add refcounting support to mfd_cells

This provides convenience functions for sharing of cells across
multiple mfd clients.  Mfd drivers can provide enable/disable hooks
to actually tweak the hardware, and clients can call
mfd_shared_cell_{en,dis}able without having to worry about whether
or not another client happens to have enabled or disabled the
cell/hardware.

Note that this is purely optional; drivers can continue to use
the mfd_cell's enable/disable hooks for their own purposes, if
desired.

Signed-off-by: Andres Salomon <dilinger@queued.net>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c
index 01115f6..ca789f8 100644 (file)
--- a/drivers/mfd/mfd-core.c
+++ b/drivers/mfd/mfd-core.c
@@ -18,6 +18,43 @@
 #include <linux/pm_runtime.h>
 #include <linux/slab.h>
 
+int mfd_shared_cell_enable(struct platform_device *pdev)
+{
+       const struct mfd_cell *cell = mfd_get_cell(pdev);
+       int err = 0;
+
+       /* only call enable hook if the cell wasn't previously enabled */
+       if (atomic_inc_return(cell->usage_count) == 1)
+               err = cell->enable(pdev);
+
+       /* if the enable hook failed, decrement counter to allow retries */
+       if (err)
+               atomic_dec(cell->usage_count);
+
+       return err;
+}
+EXPORT_SYMBOL(mfd_shared_cell_enable);
+
+int mfd_shared_cell_disable(struct platform_device *pdev)
+{
+       const struct mfd_cell *cell = mfd_get_cell(pdev);
+       int err = 0;
+
+       /* only disable if no other clients are using it */
+       if (atomic_dec_return(cell->usage_count) == 0)
+               err = cell->disable(pdev);
+
+       /* if the disable hook failed, increment to allow retries */
+       if (err)
+               atomic_inc(cell->usage_count);
+
+       /* sanity check; did someone call disable too many times? */
+       WARN_ON(atomic_read(cell->usage_count) < 0);
+
+       return err;
+}
+EXPORT_SYMBOL(mfd_shared_cell_disable);
+
 static int mfd_add_device(struct device *parent, int id,
                          const struct mfd_cell *cell,
                          struct resource *mem_base,
@@ -96,14 +133,22 @@ fail_alloc:
 }
 
 int mfd_add_devices(struct device *parent, int id,
-                   const struct mfd_cell *cells, int n_devs,
+                   struct mfd_cell *cells, int n_devs,
                    struct resource *mem_base,
                    int irq_base)
 {
        int i;
        int ret = 0;
+       atomic_t *cnts;
+
+       /* initialize reference counting for all cells */
+       cnts = kcalloc(sizeof(*cnts), n_devs, GFP_KERNEL);
+       if (!cnts)
+               return -ENOMEM;
 
        for (i = 0; i < n_devs; i++) {
+               atomic_set(&cnts[i], 0);
+               cells[i].usage_count = &cnts[i];
                ret = mfd_add_device(parent, id, cells + i, mem_base, irq_base);
                if (ret)
                        break;
@@ -116,15 +161,26 @@ int mfd_add_devices(struct device *parent, int id,
 }
 EXPORT_SYMBOL(mfd_add_devices);
 
-static int mfd_remove_devices_fn(struct device *dev, void *unused)
+static int mfd_remove_devices_fn(struct device *dev, void *c)
 {
-       platform_device_unregister(to_platform_device(dev));
+       struct platform_device *pdev = to_platform_device(dev);
+       const struct mfd_cell *cell = mfd_get_cell(pdev);
+       atomic_t **usage_count = c;
+
+       /* find the base address of usage_count pointers (for freeing) */
+       if (!*usage_count || (cell->usage_count < *usage_count))
+               *usage_count = cell->usage_count;
+
+       platform_device_unregister(pdev);
        return 0;
 }
 
 void mfd_remove_devices(struct device *parent)
 {
-       device_for_each_child(parent, NULL, mfd_remove_devices_fn);
+       atomic_t *cnts = NULL;
+
+       device_for_each_child(parent, &cnts, mfd_remove_devices_fn);
+       kfree(cnts);
 }
 EXPORT_SYMBOL(mfd_remove_devices);
 

diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h
index 71cd1f9..22a2f5e 100644 (file)
--- a/include/linux/mfd/core.h
+++ b/include/linux/mfd/core.h
@@ -25,8 +25,11 @@ struct mfd_cell {
        const char              *name;
        int                     id;
 
+       /* refcounting for multiple drivers to use a single cell */
+       atomic_t                *usage_count;
        int                     (*enable)(struct platform_device *dev);
        int                     (*disable)(struct platform_device *dev);
+
        int                     (*suspend)(struct platform_device *dev);
        int                     (*resume)(struct platform_device *dev);
 
@@ -50,6 +53,15 @@ struct mfd_cell {
        bool                    pm_runtime_no_callbacks;
 };
 
+/*
+ * Convenience functions for clients using shared cells.  Refcounting
+ * happens automatically, with the cell's enable/disable callbacks
+ * being called only when a device is first being enabled or no other
+ * clients are making use of it.
+ */
+extern int mfd_shared_cell_enable(struct platform_device *pdev);
+extern int mfd_shared_cell_disable(struct platform_device *pdev);
+
 /*
  * Given a platform device that's been created by mfd_add_devices(), fetch
  * the mfd_cell that created it.
@@ -69,7 +81,7 @@ static inline void *mfd_get_data(struct platform_device *pdev)
 }
 
 extern int mfd_add_devices(struct device *parent, int id,
-                          const struct mfd_cell *cells, int n_devs,
+                          struct mfd_cell *cells, int n_devs,
                           struct resource *mem_base,
                           int irq_base);