mfd: Add mfd_clone_cell(), convert cs5535-mfd/olpc-xo1 to it

Replace mfd_shared_platform_driver_register with mfd_clone_cell.  The
former was called by an mfd client, and registered both a platform driver
and device.  The latter is called by an mfd driver, and registers only a
platform device.

The downside of this is that mfd drivers need to be modified whenever
new clients are added that share a cell; the upside is that it fits
Linux's driver model better.  It's also simpler.

This also converts cs5535-mfd/olpc-xo1 from the old API.  cs5535-mfd
now creates the olpc-xo1-{acpi,pms} devices, while olpc-xo1 binds to
them via platform drivers.

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

2 files changed, 29 insertions, 42 deletions

diff --git a/drivers/mfd/cs5535-mfd.c b/drivers/mfd/cs5535-mfd.c
index 886a06871065..24959ddd9324 100644
--- a/drivers/mfd/cs5535-mfd.c
+++ b/drivers/mfd/cs5535-mfd.c
@@ -27,6 +27,7 @@
 #include <linux/mfd/core.h>
 #include <linux/module.h>
 #include <linux/pci.h>
+#include <asm/olpc.h>
 
 #define DRV_NAME "cs5535-mfd"
 
@@ -111,6 +112,22 @@ static __devinitdata struct mfd_cell cs5535_mfd_cells[] = {
         },
 };
 
+#ifdef CONFIG_OLPC
+static void __devinit cs5535_clone_olpc_cells(void)
+{
+        const char *acpi_clones[] = { "olpc-xo1-acpi" };
+        const char *pms_clones[] = { "olpc-xo1-pms" };
+
+        if (!machine_is_olpc())
+                return;
+
+        mfd_clone_cell("cs5535-acpi", acpi_clones, ARRAY_SIZE(acpi_clones));
+        mfd_clone_cell("cs5535-pms", pms_clones, ARRAY_SIZE(pms_clones));
+}
+#else
+static void cs5535_clone_olpc_cells(void) { }
+#endif
+
 static int __devinit cs5535_mfd_probe(struct pci_dev *pdev,
                 const struct pci_device_id *id)
 {
@@ -139,6 +156,7 @@ static int __devinit cs5535_mfd_probe(struct pci_dev *pdev,
                 dev_err(&pdev->dev, "MFD add devices failed: %d\n", err);
                 goto err_disable;
         }
+        cs5535_clone_olpc_cells();
 
         dev_info(&pdev->dev, "%zu devices registered.\n",
                         ARRAY_SIZE(cs5535_mfd_cells));
diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c
index 79eda0264fb2..d01574d98870 100644
--- a/drivers/mfd/mfd-core.c
+++ b/drivers/mfd/mfd-core.c
@@ -184,16 +184,12 @@ void mfd_remove_devices(struct device *parent)
 }
 EXPORT_SYMBOL(mfd_remove_devices);
 
-static int add_shared_platform_device(const char *cell, const char *name)
+int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones)
 {
         struct mfd_cell cell_entry;
         struct device *dev;
         struct platform_device *pdev;
-        int err;
-
-        /* check if we've already registered a device (don't fail if we have) */
-        if (bus_find_device_by_name(&platform_bus_type, NULL, name))
-                return 0;
+        int i;
 
         /* fetch the parent cell's device (should already be registered!) */
         dev = bus_find_device_by_name(&platform_bus_type, NULL, cell);
@@ -206,44 +202,17 @@ static int add_shared_platform_device(const char *cell, const char *name)
 
         WARN_ON(!cell_entry.enable);
 
-        cell_entry.name = name;
-        err = mfd_add_device(pdev->dev.parent, -1, &cell_entry, NULL, 0);
-        if (err)
-                dev_err(dev, "MFD add devices failed: %d\n", err);
-        return err;
-}
-
-int mfd_shared_platform_driver_register(struct platform_driver *drv,
-                const char *cellname)
-{
-        int err;
-
-        err = add_shared_platform_device(cellname, drv->driver.name);
-        if (err)
-                printk(KERN_ERR "failed to add platform device %s\n",
-                                drv->driver.name);
-
-        err = platform_driver_register(drv);
-        if (err)
-                printk(KERN_ERR "failed to add platform driver %s\n",
-                                drv->driver.name);
-
-        return err;
-}
-EXPORT_SYMBOL(mfd_shared_platform_driver_register);
-
-void mfd_shared_platform_driver_unregister(struct platform_driver *drv)
-{
-        struct device *dev;
-
-        dev = bus_find_device_by_name(&platform_bus_type, NULL,
-                        drv->driver.name);
-        if (dev)
-                platform_device_unregister(to_platform_device(dev));
+        for (i = 0; i < n_clones; i++) {
+                cell_entry.name = clones[i];
+                /* don't give up if a single call fails; just report error */
+                if (mfd_add_device(pdev->dev.parent, -1, &cell_entry, NULL, 0))
+                        dev_err(dev, "failed to create platform device '%s'\n",
+                                        clones[i]);
+        }
 
-        platform_driver_unregister(drv);
+        return 0;
 }
-EXPORT_SYMBOL(mfd_shared_platform_driver_unregister);
+EXPORT_SYMBOL(mfd_clone_cell);
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");