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https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
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[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>
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4 changed files with 175 additions and 0 deletions
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@ -5,6 +5,10 @@
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menu "Multifunction device drivers"
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menu "Multifunction device drivers"
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depends on HAS_IOMEM
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depends on HAS_IOMEM
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config MFD_CORE
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tristate
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default n
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config MFD_SM501
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config MFD_SM501
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tristate "Support for Silicon Motion SM501"
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tristate "Support for Silicon Motion SM501"
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---help---
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---help---
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@ -10,6 +10,8 @@ obj-$(CONFIG_HTC_PASIC3) += htc-pasic3.o
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obj-$(CONFIG_MFD_TC6393XB) += tc6393xb.o
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obj-$(CONFIG_MFD_TC6393XB) += tc6393xb.o
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obj-$(CONFIG_MFD_CORE) += mfd-core.o
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obj-$(CONFIG_MCP) += mcp-core.o
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obj-$(CONFIG_MCP) += mcp-core.o
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obj-$(CONFIG_MCP_SA11X0) += mcp-sa11x0.o
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obj-$(CONFIG_MCP_SA11X0) += mcp-sa11x0.o
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obj-$(CONFIG_MCP_UCB1200) += ucb1x00-core.o
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obj-$(CONFIG_MCP_UCB1200) += ucb1x00-core.o
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114
drivers/mfd/mfd-core.c
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114
drivers/mfd/mfd-core.c
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@ -0,0 +1,114 @@
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/*
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* drivers/mfd/mfd-core.c
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*
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* core MFD support
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* Copyright (c) 2006 Ian Molton
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* Copyright (c) 2007,2008 Dmitry Baryshkov
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/core.h>
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static int mfd_add_device(struct platform_device *parent,
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const struct mfd_cell *cell,
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struct resource *mem_base,
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int irq_base)
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{
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struct resource res[cell->num_resources];
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struct platform_device *pdev;
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int ret = -ENOMEM;
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int r;
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pdev = platform_device_alloc(cell->name, parent->id);
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if (!pdev)
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goto fail_alloc;
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pdev->dev.parent = &parent->dev;
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ret = platform_device_add_data(pdev,
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cell, sizeof(struct mfd_cell));
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if (ret)
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goto fail_device;
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memzero(res, sizeof(res));
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for (r = 0; r < cell->num_resources; r++) {
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res[r].name = cell->resources[r].name;
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res[r].flags = cell->resources[r].flags;
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/* Find out base to use */
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if (cell->resources[r].flags & IORESOURCE_MEM) {
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res[r].parent = mem_base;
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res[r].start = mem_base->start +
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cell->resources[r].start;
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res[r].end = mem_base->start +
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cell->resources[r].end;
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} else if (cell->resources[r].flags & IORESOURCE_IRQ) {
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res[r].start = irq_base +
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cell->resources[r].start;
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res[r].end = irq_base +
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cell->resources[r].end;
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} else {
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res[r].parent = cell->resources[r].parent;
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res[r].start = cell->resources[r].start;
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res[r].end = cell->resources[r].end;
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}
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}
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platform_device_add_resources(pdev, res, cell->num_resources);
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ret = platform_device_add(pdev);
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if (ret)
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goto fail_device;
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return 0;
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/* platform_device_del(pdev); */
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fail_device:
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platform_device_put(pdev);
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fail_alloc:
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return ret;
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}
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int mfd_add_devices(
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struct platform_device *parent,
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const struct mfd_cell *cells, int n_devs,
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struct resource *mem_base,
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int irq_base)
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{
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int i;
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int ret = 0;
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for (i = 0; i < n_devs; i++) {
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ret = mfd_add_device(parent, cells + i, mem_base, irq_base);
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if (ret)
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break;
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}
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if (ret)
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mfd_remove_devices(parent);
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return ret;
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}
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EXPORT_SYMBOL(mfd_add_devices);
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static int mfd_remove_devices_fn(struct device *dev, void *unused)
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{
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platform_device_unregister(
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container_of(dev, struct platform_device, dev));
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return 0;
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}
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void mfd_remove_devices(struct platform_device *parent)
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{
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device_for_each_child(&parent->dev, NULL, mfd_remove_devices_fn);
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}
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EXPORT_SYMBOL(mfd_remove_devices);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");
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55
include/linux/mfd/core.h
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55
include/linux/mfd/core.h
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#ifndef MFD_CORE_H
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#define MFD_CORE_H
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/*
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* drivers/mfd/mfd-core.h
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*
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* core MFD support
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* Copyright (c) 2006 Ian Molton
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* Copyright (c) 2007 Dmitry Baryshkov
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/platform_device.h>
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/*
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* This struct describes the MFD part ("cell").
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* After registration the copy of this structure will become the platform data
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* of the resulting platform_device
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*/
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struct mfd_cell {
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const char *name;
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int (*enable)(struct platform_device *dev);
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int (*disable)(struct platform_device *dev);
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int (*suspend)(struct platform_device *dev);
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int (*resume)(struct platform_device *dev);
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void *driver_data; /* driver-specific data */
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/*
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* This resources can be specified relatievly to the parent device.
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* For accessing device you should use resources from device
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*/
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int num_resources;
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const struct resource *resources;
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};
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static inline struct mfd_cell *
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mfd_get_cell(struct platform_device *pdev)
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{
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return (struct mfd_cell *)pdev->dev.platform_data;
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}
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extern int mfd_add_devices(
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struct platform_device *parent,
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const struct mfd_cell *cells, int n_devs,
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struct resource *mem_base,
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int irq_base);
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extern void mfd_remove_devices(struct platform_device *parent);
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#endif
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