[ARM] 5127/1: Core MFD support

This patch provides a common subdevice registration system for MFD type
chips, using platfrom device.

Signed-off-by: Ian Molton <spyro@f2s.com>
Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

4 files changed, 175 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 1a1ac262fc87..8ebc0be10953 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -5,6 +5,10 @@
 menu "Multifunction device drivers"
         depends on HAS_IOMEM
 
+config MFD_CORE
+        tristate
+        default n
+
 config MFD_SM501
         tristate "Support for Silicon Motion SM501"
          ---help---
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index b4168442d53c..33daa2f45dd8 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -10,6 +10,8 @@ obj-$(CONFIG_HTC_PASIC3)	+= htc-pasic3.o
 
 obj-$(CONFIG_MFD_TC6393XB)      += tc6393xb.o
 
+obj-$(CONFIG_MFD_CORE)          += mfd-core.o
+
 obj-$(CONFIG_MCP)               += mcp-core.o
 obj-$(CONFIG_MCP_SA11X0)        += mcp-sa11x0.o
 obj-$(CONFIG_MCP_UCB1200)       += ucb1x00-core.o
diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c
new file mode 100644
index 000000000000..d7d88ce053a6
--- /dev/null
+++ b/drivers/mfd/mfd-core.c
@@ -0,0 +1,114 @@
+/*
+ * drivers/mfd/mfd-core.c
+ *
+ * core MFD support
+ * Copyright (c) 2006 Ian Molton
+ * Copyright (c) 2007,2008 Dmitry Baryshkov
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/core.h>
+
+static int mfd_add_device(struct platform_device *parent,
+                const struct mfd_cell *cell,
+                struct resource *mem_base,
+                int irq_base)
+{
+        struct resource res[cell->num_resources];
+        struct platform_device *pdev;
+        int ret = -ENOMEM;
+        int r;
+
+        pdev = platform_device_alloc(cell->name, parent->id);
+        if (!pdev)
+                goto fail_alloc;
+
+        pdev->dev.parent = &parent->dev;
+
+        ret = platform_device_add_data(pdev,
+                        cell, sizeof(struct mfd_cell));
+        if (ret)
+                goto fail_device;
+
+        memzero(res, sizeof(res));
+        for (r = 0; r < cell->num_resources; r++) {
+                res[r].name = cell->resources[r].name;
+                res[r].flags = cell->resources[r].flags;
+
+                /* Find out base to use */
+                if (cell->resources[r].flags & IORESOURCE_MEM) {
+                        res[r].parent = mem_base;
+                        res[r].start = mem_base->start +
+                                cell->resources[r].start;
+                        res[r].end = mem_base->start +
+                                cell->resources[r].end;
+                } else if (cell->resources[r].flags & IORESOURCE_IRQ) {
+                        res[r].start = irq_base +
+                                cell->resources[r].start;
+                        res[r].end   = irq_base +
+                                cell->resources[r].end;
+                } else {
+                        res[r].parent = cell->resources[r].parent;
+                        res[r].start = cell->resources[r].start;
+                        res[r].end   = cell->resources[r].end;
+                }
+        }
+
+        platform_device_add_resources(pdev, res, cell->num_resources);
+
+        ret = platform_device_add(pdev);
+        if (ret)
+                goto fail_device;
+
+        return 0;
+
+/*      platform_device_del(pdev); */
+fail_device:
+        platform_device_put(pdev);
+fail_alloc:
+        return ret;
+}
+
+int mfd_add_devices(
+                struct platform_device *parent,
+                const struct mfd_cell *cells, int n_devs,
+                struct resource *mem_base,
+                int irq_base)
+{
+        int i;
+        int ret = 0;
+
+        for (i = 0; i < n_devs; i++) {
+                ret = mfd_add_device(parent, cells + i, mem_base, irq_base);
+                if (ret)
+                        break;
+        }
+
+        if (ret)
+                mfd_remove_devices(parent);
+
+        return ret;
+}
+EXPORT_SYMBOL(mfd_add_devices);
+
+static int mfd_remove_devices_fn(struct device *dev, void *unused)
+{
+        platform_device_unregister(
+                        container_of(dev, struct platform_device, dev));
+        return 0;
+}
+
+void mfd_remove_devices(struct platform_device *parent)
+{
+        device_for_each_child(&parent->dev, NULL, mfd_remove_devices_fn);
+}
+EXPORT_SYMBOL(mfd_remove_devices);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");
diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h
new file mode 100644
index 000000000000..bb3dd0545928
--- /dev/null
+++ b/include/linux/mfd/core.h
@@ -0,0 +1,55 @@
+#ifndef MFD_CORE_H
+#define MFD_CORE_H
+/*
+ * drivers/mfd/mfd-core.h
+ *
+ * core MFD support
+ * Copyright (c) 2006 Ian Molton
+ * Copyright (c) 2007 Dmitry Baryshkov
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/platform_device.h>
+
+/*
+ * This struct describes the MFD part ("cell").
+ * After registration the copy of this structure will become the platform data
+ * of the resulting platform_device
+ */
+struct mfd_cell {
+        const char              *name;
+
+        int                     (*enable)(struct platform_device *dev);
+        int                     (*disable)(struct platform_device *dev);
+        int                     (*suspend)(struct platform_device *dev);
+        int                     (*resume)(struct platform_device *dev);
+
+        void                    *driver_data; /* driver-specific data */
+
+        /*
+         * This resources can be specified relatievly to the parent device.
+         * For accessing device you should use resources from device
+         */
+        int                     num_resources;
+        const struct resource   *resources;
+};
+
+static inline struct mfd_cell *
+mfd_get_cell(struct platform_device *pdev)
+{
+        return (struct mfd_cell *)pdev->dev.platform_data;
+}
+
+extern int mfd_add_devices(
+                struct platform_device *parent,
+                const struct mfd_cell *cells, int n_devs,
+                struct resource *mem_base,
+                int irq_base);
+
+extern void mfd_remove_devices(struct platform_device *parent);
+
+#endif