mfd: Add sharing for cs5535 acpi/pms cells

This enables sharing of cs5535-mfd cells via the new mfd_shared_* API.
Hooks for enable/disble of resources are added, with refcounting of
resources being automatically handled so that cs5535_mfd_res_enable/disable
are only called when necessary.

Clients of cs5535-mfd (in this case, olpc-xo1.c) are also modified to
use the mfd_shared API.  The platform drivers are also renamed to
olpc-xo1-{pms,acpi}, and resource enabling/disabling is replaced
with mfd_shared API calls.

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

2 files changed, 57 insertions, 22 deletions

diff --git a/arch/x86/platform/olpc/olpc-xo1.c b/arch/x86/platform/olpc/olpc-xo1.c
index 127775696d6c..f4155354a7b0 100644
--- a/arch/x86/platform/olpc/olpc-xo1.c
+++ b/arch/x86/platform/olpc/olpc-xo1.c
@@ -15,6 +15,7 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/pm.h>
+#include <linux/mfd/core.h>
 
 #include <asm/io.h>
 #include <asm/olpc.h>
@@ -56,25 +57,24 @@ static void xo1_power_off(void)
 static int __devinit olpc_xo1_probe(struct platform_device *pdev)
 {
         struct resource *res;
+        int err;
 
         /* don't run on non-XOs */
         if (!machine_is_olpc())
                 return -ENODEV;
 
+        err = mfd_shared_cell_enable(pdev);
+        if (err)
+                return err;
+
         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
         if (!res) {
                 dev_err(&pdev->dev, "can't fetch device resource info\n");
                 return -EIO;
         }
-
-        if (!request_region(res->start, resource_size(res), DRV_NAME)) {
-                dev_err(&pdev->dev, "can't request region\n");
-                return -EIO;
-        }
-
-        if (strcmp(pdev->name, "cs5535-pms") == 0)
+        if (strcmp(pdev->name, "olpc-xo1-pms") == 0)
                 pms_base = res->start;
-        else if (strcmp(pdev->name, "cs5535-acpi") == 0)
+        else if (strcmp(pdev->name, "olpc-xo1-ac-acpi") == 0)
                 acpi_base = res->start;
 
         /* If we have both addresses, we can override the poweroff hook */
@@ -88,14 +88,11 @@ static int __devinit olpc_xo1_probe(struct platform_device *pdev)
 
 static int __devexit olpc_xo1_remove(struct platform_device *pdev)
 {
-        struct resource *r;
-
-        r = platform_get_resource(pdev, IORESOURCE_IO, 0);
-        release_region(r->start, resource_size(r));
+        mfd_shared_cell_disable(pdev);
 
-        if (strcmp(pdev->name, "cs5535-pms") == 0)
+        if (strcmp(pdev->name, "olpc-xo1-pms") == 0)
                 pms_base = 0;
-        else if (strcmp(pdev->name, "cs5535-acpi") == 0)
+        else if (strcmp(pdev->name, "olpc-xo1-acpi") == 0)
                 acpi_base = 0;
 
         pm_power_off = NULL;
@@ -104,7 +101,7 @@ static int __devexit olpc_xo1_remove(struct platform_device *pdev)
 
 static struct platform_driver cs5535_pms_drv = {
         .driver = {
-                .name = "cs5535-pms",
+                .name = "olpc-xo1-pms",
                 .owner = THIS_MODULE,
         },
         .probe = olpc_xo1_probe,
@@ -113,7 +110,7 @@ static struct platform_driver cs5535_pms_drv = {
 
 static struct platform_driver cs5535_acpi_drv = {
         .driver = {
-                .name = "cs5535-acpi",
+                .name = "olpc-xo1-acpi",
                 .owner = THIS_MODULE,
         },
         .probe = olpc_xo1_probe,
@@ -124,26 +121,27 @@ static int __init olpc_xo1_init(void)
 {
         int r;
 
-        r = platform_driver_register(&cs5535_pms_drv);
+        r = mfd_shared_platform_driver_register(&cs5535_pms_drv, "cs5535-pms");
         if (r)
                 return r;
 
-        r = platform_driver_register(&cs5535_acpi_drv);
+        r = mfd_shared_platform_driver_register(&cs5535_acpi_drv,
+                        "cs5535-acpi");
         if (r)
-                platform_driver_unregister(&cs5535_pms_drv);
+                mfd_shared_platform_driver_unregister(&cs5535_pms_drv);
 
         return r;
 }
 
 static void __exit olpc_xo1_exit(void)
 {
-        platform_driver_unregister(&cs5535_acpi_drv);
-        platform_driver_unregister(&cs5535_pms_drv);
+        mfd_shared_platform_driver_unregister(&cs5535_acpi_drv);
+        mfd_shared_platform_driver_unregister(&cs5535_pms_drv);
 }
 
 MODULE_AUTHOR("Daniel Drake <dsd@laptop.org>");
 MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:olpc-xo1");
+MODULE_ALIAS("platform:cs5535-pms");
 
 module_init(olpc_xo1_init);
 module_exit(olpc_xo1_exit);
diff --git a/drivers/mfd/cs5535-mfd.c b/drivers/mfd/cs5535-mfd.c
index 59ca6f151e78..886a06871065 100644
--- a/drivers/mfd/cs5535-mfd.c
+++ b/drivers/mfd/cs5535-mfd.c
@@ -39,6 +39,37 @@ enum cs5535_mfd_bars {
         NR_BARS,
 };
 
+static int cs5535_mfd_res_enable(struct platform_device *pdev)
+{
+        struct resource *res;
+
+        res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+        if (!res) {
+                dev_err(&pdev->dev, "can't fetch device resource info\n");
+                return -EIO;
+        }
+
+        if (!request_region(res->start, resource_size(res), DRV_NAME)) {
+                dev_err(&pdev->dev, "can't request region\n");
+                return -EIO;
+        }
+
+        return 0;
+}
+
+static int cs5535_mfd_res_disable(struct platform_device *pdev)
+{
+        struct resource *res;
+        res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+        if (!res) {
+                dev_err(&pdev->dev, "can't fetch device resource info\n");
+                return -EIO;
+        }
+
+        release_region(res->start, resource_size(res));
+        return 0;
+}
+
 static __devinitdata struct resource cs5535_mfd_resources[NR_BARS];
 
 static __devinitdata struct mfd_cell cs5535_mfd_cells[] = {
@@ -65,12 +96,18 @@ static __devinitdata struct mfd_cell cs5535_mfd_cells[] = {
                 .name = "cs5535-pms",
                 .num_resources = 1,
                 .resources = &cs5535_mfd_resources[PMS_BAR],
+
+                .enable = cs5535_mfd_res_enable,
+                .disable = cs5535_mfd_res_disable,
         },
         {
                 .id = ACPI_BAR,
                 .name = "cs5535-acpi",
                 .num_resources = 1,
                 .resources = &cs5535_mfd_resources[ACPI_BAR],
+
+                .enable = cs5535_mfd_res_enable,
+                .disable = cs5535_mfd_res_disable,
         },
 };