mirror of
https://github.com/torvalds/linux.git
synced 2024-11-07 20:51:47 +00:00
fe891a008f
Previously, one would set the mfd_cell's platform_data/data_size to point to the current mfd_cell in order to pass that information along to drivers. This causes the current mfd_cell to always be available to drivers. It also adds a wrapper function for fetching the mfd cell from a platform device, similar to what originally existed for mfd devices. Drivers who previously used platform_data for other purposes can still use it; the difference is that mfd_get_data() must be used to access it (and the pdata structure is no longer allocated in mfd_add_devices). Note that mfd_get_data is intentionally vague (in name) about where the data is stored; variable name changes can come later without having to touch brazillions of drivers. Signed-off-by: Andres Salomon <dilinger@queued.net> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
134 lines
3.0 KiB
C
134 lines
3.0 KiB
C
/*
|
|
* 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/acpi.h>
|
|
#include <linux/mfd/core.h>
|
|
#include <linux/pm_runtime.h>
|
|
#include <linux/slab.h>
|
|
|
|
static int mfd_add_device(struct device *parent, int id,
|
|
const struct mfd_cell *cell,
|
|
struct resource *mem_base,
|
|
int irq_base)
|
|
{
|
|
struct resource *res;
|
|
struct platform_device *pdev;
|
|
int ret = -ENOMEM;
|
|
int r;
|
|
|
|
pdev = platform_device_alloc(cell->name, id + cell->id);
|
|
if (!pdev)
|
|
goto fail_alloc;
|
|
|
|
res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL);
|
|
if (!res)
|
|
goto fail_device;
|
|
|
|
pdev->dev.parent = parent;
|
|
platform_set_drvdata(pdev, cell->driver_data);
|
|
|
|
ret = platform_device_add_data(pdev, cell, sizeof(*cell));
|
|
if (ret)
|
|
goto fail_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) && mem_base) {
|
|
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;
|
|
}
|
|
|
|
if (!cell->ignore_resource_conflicts) {
|
|
ret = acpi_check_resource_conflict(res);
|
|
if (ret)
|
|
goto fail_res;
|
|
}
|
|
}
|
|
|
|
ret = platform_device_add_resources(pdev, res, cell->num_resources);
|
|
if (ret)
|
|
goto fail_res;
|
|
|
|
ret = platform_device_add(pdev);
|
|
if (ret)
|
|
goto fail_res;
|
|
|
|
if (cell->pm_runtime_no_callbacks)
|
|
pm_runtime_no_callbacks(&pdev->dev);
|
|
|
|
kfree(res);
|
|
|
|
return 0;
|
|
|
|
/* platform_device_del(pdev); */
|
|
fail_res:
|
|
kfree(res);
|
|
fail_device:
|
|
platform_device_put(pdev);
|
|
fail_alloc:
|
|
return ret;
|
|
}
|
|
|
|
int mfd_add_devices(struct device *parent, int id,
|
|
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, id, 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(to_platform_device(dev));
|
|
return 0;
|
|
}
|
|
|
|
void mfd_remove_devices(struct device *parent)
|
|
{
|
|
device_for_each_child(parent, NULL, mfd_remove_devices_fn);
|
|
}
|
|
EXPORT_SYMBOL(mfd_remove_devices);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");
|