[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>

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 1a1ac262fc87ee75073585b288cab5d2b767500f..8ebc0be10953c0ddfa976d4d25e70d322f549fa3 100644 (file)
--- 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 b4168442d53c01e9f939565b5b311f2caec73016..33daa2f45dd8c7da6d6aba43a82467833d195239 100644 (file)
--- 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 (file)
index 0000000..d7d88ce
--- /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 (file)
index 0000000..bb3dd05
--- /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