4c90aa94f6
Allow MFD cells to have pm_runtime_no_callbacks() called on them during registration. This causes the runtime PM framework to ignore them, allowing use of runtime PM to suspend the device as a whole even if not all drivers for the MFD can usefully implement runtime PM. For example, RTCs are likely to run continuously regardless of the power state of the system. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
137 lines
3 KiB
C
137 lines
3 KiB
C
/*
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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/acpi.h>
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#include <linux/mfd/core.h>
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#include <linux/pm_runtime.h>
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#include <linux/slab.h>
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static int mfd_add_device(struct device *parent, int id,
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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;
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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, id + cell->id);
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if (!pdev)
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goto fail_alloc;
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res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL);
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if (!res)
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goto fail_device;
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pdev->dev.parent = parent;
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platform_set_drvdata(pdev, cell->driver_data);
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if (cell->data_size) {
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ret = platform_device_add_data(pdev,
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cell->platform_data, cell->data_size);
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if (ret)
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goto fail_res;
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}
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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) && mem_base) {
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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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if (!cell->ignore_resource_conflicts) {
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ret = acpi_check_resource_conflict(res);
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if (ret)
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goto fail_res;
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}
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}
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ret = platform_device_add_resources(pdev, res, cell->num_resources);
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if (ret)
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goto fail_res;
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ret = platform_device_add(pdev);
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if (ret)
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goto fail_res;
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if (cell->pm_runtime_no_callbacks)
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pm_runtime_no_callbacks(&pdev->dev);
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kfree(res);
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return 0;
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/* platform_device_del(pdev); */
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fail_res:
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kfree(res);
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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(struct device *parent, int id,
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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, id, 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(to_platform_device(dev));
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return 0;
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}
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void mfd_remove_devices(struct device *parent)
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{
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device_for_each_child(parent, 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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