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/*

 * platform.c - platform 'pseudo' bus for legacy devices

 *

 * Copyright (c) 2002-3 Patrick Mochel

 * Copyright (c) 2002-3 Open Source Development Labs

 *

 * This file is released under the GPLv2

 *

 * Please see Documentation/driver-model/platform.txt for more

 * information.

 */

#include <linux/platform_device.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/dma-mapping.h>

#include <linux/bootmem.h>

#include <linux/err.h>

#include <linux/slab.h>

#include "base.h"

#define to_platform_driver(drv) (container_of((drv), struct platform_driver, driver))

struct device platform_bus = {

        .bus_id         = "platform",

};

EXPORT_SYMBOL_GPL(platform_bus);

/**

 *      platform_get_resource - get a resource for a device

 *      @dev: platform device

 *      @type: resource type

 *      @num: resource index

 */

struct resource *

platform_get_resource(struct platform_device *dev, unsigned int type,

                      unsigned int num)

{

        int i;

        for (i = 0; i < dev->num_resources; i++) {

                struct resource *r = &dev->resource[i];

                if ((r->flags & (IORESOURCE_IO|IORESOURCE_MEM|

                                 IORESOURCE_IRQ|IORESOURCE_DMA))

                    == type)

                        if (num-- == 0)

                                return r;

        }

        return NULL;

}

EXPORT_SYMBOL_GPL(platform_get_resource);

/**

 *      platform_get_irq - get an IRQ for a device

 *      @dev: platform device

 *      @num: IRQ number index

 */

int platform_get_irq(struct platform_device *dev, unsigned int num)

{

        struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);

        return r ? r->start : -ENXIO;

}

EXPORT_SYMBOL_GPL(platform_get_irq);

/**

 *      platform_get_resource_byname - get a resource for a device by name

 *      @dev: platform device

 *      @type: resource type

 *      @name: resource name

 */

struct resource *

platform_get_resource_byname(struct platform_device *dev, unsigned int type,

                      char *name)

{

        int i;

        for (i = 0; i < dev->num_resources; i++) {

                struct resource *r = &dev->resource[i];

                if ((r->flags & (IORESOURCE_IO|IORESOURCE_MEM|

                                 IORESOURCE_IRQ|IORESOURCE_DMA)) == type)

                        if (!strcmp(r->name, name))

                                return r;

        }

        return NULL;

}

EXPORT_SYMBOL_GPL(platform_get_resource_byname);

/**

 *      platform_get_irq - get an IRQ for a device

 *      @dev: platform device

 *      @name: IRQ name

 */

int platform_get_irq_byname(struct platform_device *dev, char *name)

{

        struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);

        return r ? r->start : -ENXIO;

}

EXPORT_SYMBOL_GPL(platform_get_irq_byname);

/**

 *      platform_add_devices - add a numbers of platform devices

 *      @devs: array of platform devices to add

 *      @num: number of platform devices in array

 */

int platform_add_devices(struct platform_device **devs, int num)

{

        int i, ret = 0;

        for (i = 0; i < num; i++) {

                ret = platform_device_register(devs[i]);

                if (ret) {

                        while (--i >= 0)

                                platform_device_unregister(devs[i]);

                        break;

                }

        }

        return ret;

}

EXPORT_SYMBOL_GPL(platform_add_devices);

struct platform_object {

        struct platform_device pdev;

        char name[1];

};

/**

 *      platform_device_put

 *      @pdev:  platform device to free

 *

 *      Free all memory associated with a platform device.  This function

 *      must _only_ be externally called in error cases.  All other usage

 *      is a bug.

 */

void platform_device_put(struct platform_device *pdev)

{

        if (pdev)

                put_device(&pdev->dev);

}

EXPORT_SYMBOL_GPL(platform_device_put);

static void platform_device_release(struct device *dev)

{

        struct platform_object *pa = container_of(dev, struct platform_object, pdev.dev);

        kfree(pa->pdev.dev.platform_data);

        kfree(pa->pdev.resource);

        kfree(pa);

}

/**

 *      platform_device_alloc

 *      @name:  base name of the device we're adding

 *      @id:    instance id

 *

 *      Create a platform device object which can have other objects attached

 *      to it, and which will have attached objects freed when it is released.

 */

struct platform_device *platform_device_alloc(const char *name, int id)

{

        struct platform_object *pa;

        pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL);

        if (pa) {

                strcpy(pa->name, name);

                pa->pdev.name = pa->name;

                pa->pdev.id = id;

                device_initialize(&pa->pdev.dev);

                pa->pdev.dev.release = platform_device_release;

        }

        return pa ? &pa->pdev : NULL;

}

EXPORT_SYMBOL_GPL(platform_device_alloc);

/**

 *      platform_device_add_resources

 *      @pdev:  platform device allocated by platform_device_alloc to add resources to

 *      @res:   set of resources that needs to be allocated for the device

 *      @num:   number of resources

 *

 *      Add a copy of the resources to the platform device.  The memory

 *      associated with the resources will be freed when the platform

 *      device is released.

 */

int platform_device_add_resources(struct platform_device *pdev, struct resource *res, unsigned int num)

{

        struct resource *r;

        r = kmalloc(sizeof(struct resource) * num, GFP_KERNEL);

        if (r) {

                memcpy(r, res, sizeof(struct resource) * num);

                pdev->resource = r;

                pdev->num_resources = num;

        }

        return r ? 0 : -ENOMEM;

}

EXPORT_SYMBOL_GPL(platform_device_add_resources);

/**

 *      platform_device_add_data

 *      @pdev:  platform device allocated by platform_device_alloc to add resources to

 *      @data:  platform specific data for this platform device

 *      @size:  size of platform specific data

 *

 *      Add a copy of platform specific data to the platform device's platform_data

 *      pointer.  The memory associated with the platform data will be freed

 *      when the platform device is released.

 */

int platform_device_add_data(struct platform_device *pdev, const void *data, size_t size)

{

        void *d;

        d = kmalloc(size, GFP_KERNEL);

        if (d) {

                memcpy(d, data, size);

                pdev->dev.platform_data = d;

        }

        return d ? 0 : -ENOMEM;

}

EXPORT_SYMBOL_GPL(platform_device_add_data);

/**

 *      platform_device_add - add a platform device to device hierarchy

 *      @pdev:  platform device we're adding

 *

 *      This is part 2 of platform_device_register(), though may be called

 *      separately _iff_ pdev was allocated by platform_device_alloc().

 */

int platform_device_add(struct platform_device *pdev)

{

        int i, ret = 0;

        if (!pdev)

                return -EINVAL;

        if (!pdev->dev.parent)

                pdev->dev.parent = &platform_bus;

        pdev->dev.bus = &platform_bus_type;

        if (pdev->id != -1)

                snprintf(pdev->dev.bus_id, BUS_ID_SIZE, "%s.%d", pdev->name,

                         pdev->id);

        else

                strlcpy(pdev->dev.bus_id, pdev->name, BUS_ID_SIZE);

        for (i = 0; i < pdev->num_resources; i++) {

                struct resource *p, *r = &pdev->resource[i];

                if (r->name == NULL)

                        r->name = pdev->dev.bus_id;

                p = r->parent;

                if (!p) {

                        if (r->flags & IORESOURCE_MEM)

                                p = &iomem_resource;

                        else if (r->flags & IORESOURCE_IO)

                                p = &ioport_resource;

                }

                if (p && insert_resource(p, r)) {

                        printk(KERN_ERR

                               "%s: failed to claim resource %d\n",

                               pdev->dev.bus_id, i);

                        ret = -EBUSY;

                        goto failed;

                }

        }

        pr_debug("Registering platform device '%s'. Parent at %s\n",

                 pdev->dev.bus_id, pdev->dev.parent->bus_id);

        ret = device_add(&pdev->dev);

        if (ret == 0)

                return ret;

 failed:

        while (--i >= 0)

                if (pdev->resource[i].flags & (IORESOURCE_MEM|IORESOURCE_IO))

                        release_resource(&pdev->resource[i]);

        return ret;

}

EXPORT_SYMBOL_GPL(platform_device_add);

/**

 *      platform_device_del - remove a platform-level device

 *      @pdev:  platform device we're removing

 *

 *      Note that this function will also release all memory- and port-based

 *      resources owned by the device (@dev->resource).  This function

 *      must _only_ be externally called in error cases.  All other usage

 *      is a bug.

 */

void platform_device_del(struct platform_device *pdev)

{

        int i;

        if (pdev) {

                device_del(&pdev->dev);

                for (i = 0; i < pdev->num_resources; i++) {

                        struct resource *r = &pdev->resource[i];

                        if (r->flags & (IORESOURCE_MEM|IORESOURCE_IO))

                                release_resource(r);

                }

        }

}

EXPORT_SYMBOL_GPL(platform_device_del);

/**

 *      platform_device_register - add a platform-level device

 *      @pdev:  platform device we're adding

 *

 */

int platform_device_register(struct platform_device * pdev)

{

        device_initialize(&pdev->dev);

        return platform_device_add(pdev);

}

EXPORT_SYMBOL_GPL(platform_device_register);

/**

 *      platform_device_unregister - unregister a platform-level device

 *      @pdev:  platform device we're unregistering

 *

 *      Unregistration is done in 2 steps. First we release all resources

 *      and remove it from the subsystem, then we drop reference count by

 *      calling platform_device_put().

 */

void platform_device_unregister(struct platform_device * pdev)

{

        platform_device_del(pdev);

        platform_device_put(pdev);

}

EXPORT_SYMBOL_GPL(platform_device_unregister);

/**

 *      platform_device_register_simple

 *      @name:  base name of the device we're adding

 *      @id:    instance id

 *      @res:   set of resources that needs to be allocated for the device

 *      @num:   number of resources

 *

 *      This function creates a simple platform device that requires minimal

 *      resource and memory management. Canned release function freeing

 *      memory allocated for the device allows drivers using such devices

 *      to be unloaded without waiting for the last reference to the device

 *      to be dropped.

 *

 *      This interface is primarily intended for use with legacy drivers

 *      which probe hardware directly.  Because such drivers create sysfs

 *      device nodes themselves, rather than letting system infrastructure

 *      handle such device enumeration tasks, they don't fully conform to

 *      the Linux driver model.  In particular, when such drivers are built

 *      as modules, they can't be "hotplugged".

 */

struct platform_device *platform_device_register_simple(char *name, int id,

                                                        struct resource *res, unsigned int num)

{

        struct platform_device *pdev;

        int retval;

        pdev = platform_device_alloc(name, id);

        if (!pdev) {

                retval = -ENOMEM;

                goto error;

        }

        if (num) {

                retval = platform_device_add_resources(pdev, res, num);

                if (retval)

                        goto error;

        }

        retval = platform_device_add(pdev);

        if (retval)

                goto error;

        return pdev;

error:

        platform_device_put(pdev);

        return ERR_PTR(retval);

}

EXPORT_SYMBOL_GPL(platform_device_register_simple);

static int platform_drv_probe(struct device *_dev)

{

        struct platform_driver *drv = to_platform_driver(_dev->driver);

        struct platform_device *dev = to_platform_device(_dev);

        return drv->probe(dev);

}

static int platform_drv_probe_fail(struct device *_dev)

{

        return -ENXIO;

}

static int platform_drv_remove(struct device *_dev)

{

        struct platform_driver *drv = to_platform_driver(_dev->driver);

        struct platform_device *dev = to_platform_device(_dev);

        return drv->remove(dev);

}

static void platform_drv_shutdown(struct device *_dev)

{

        struct platform_driver *drv = to_platform_driver(_dev->driver);

        struct platform_device *dev = to_platform_device(_dev);

        drv->shutdown(dev);

}

static int platform_drv_suspend(struct device *_dev, pm_message_t state)

{

        struct platform_driver *drv = to_platform_driver(_dev->driver);

        struct platform_device *dev = to_platform_device(_dev);

        return drv->suspend(dev, state);

}

static int platform_drv_resume(struct device *_dev)

{

        struct platform_driver *drv = to_platform_driver(_dev->driver);

        struct platform_device *dev = to_platform_device(_dev);

        return drv->resume(dev);

}

/**

 *      platform_driver_register

 *      @drv: platform driver structure

 */

int platform_driver_register(struct platform_driver *drv)

{

        drv->driver.bus = &platform_bus_type;

        if (drv->probe)

                drv->driver.probe = platform_drv_probe;

        if (drv->remove)

                drv->driver.remove = platform_drv_remove;

        if (drv->shutdown)

                drv->driver.shutdown = platform_drv_shutdown;

        if (drv->suspend)

                drv->driver.suspend = platform_drv_suspend;

        if (drv->resume)

                drv->driver.resume = platform_drv_resume;

        return driver_register(&drv->driver);

}

EXPORT_SYMBOL_GPL(platform_driver_register);

/**

 *      platform_driver_unregister

 *      @drv: platform driver structure

 */

void platform_driver_unregister(struct platform_driver *drv)

{

        driver_unregister(&drv->driver);

}

EXPORT_SYMBOL_GPL(platform_driver_unregister);

/**

 * platform_driver_probe - register driver for non-hotpluggable device

 * @drv: platform driver structure

 * @probe: the driver probe routine, probably from an __init section

 *

 * Use this instead of platform_driver_register() when you know the device

 * is not hotpluggable and has already been registered, and you want to

 * remove its run-once probe() infrastructure from memory after the driver

 * has bound to the device.

 *

 * One typical use for this would be with drivers for controllers integrated

 * into system-on-chip processors, where the controller devices have been

 * configured as part of board setup.

 *

 * Returns zero if the driver registered and bound to a device, else returns

 * a negative error code and with the driver not registered.

 */

int __init_or_module platform_driver_probe(struct platform_driver *drv,

                int (*probe)(struct platform_device *))

{

        int retval, code;

        /* temporary section violation during probe() */

        drv->probe = probe;

        retval = code = platform_driver_register(drv);

        /* Fixup that section violation, being paranoid about code scanning

         * the list of drivers in order to probe new devices.  Check to see

         * if the probe was successful, and make sure any forced probes of

         * new devices fail.

         */

        spin_lock(&platform_bus_type.klist_drivers.k_lock);

        drv->probe = NULL;

        if (code == 0 && list_empty(&drv->driver.klist_devices.k_list))

                retval = -ENODEV;

        drv->driver.probe = platform_drv_probe_fail;

        spin_unlock(&platform_bus_type.klist_drivers.k_lock);

        if (code != retval)

                platform_driver_unregister(drv);

        return retval;

}

EXPORT_SYMBOL_GPL(platform_driver_probe);

/* modalias support enables more hands-off userspace setup:

 * (a) environment variable lets new-style hotplug events work once system is

 *     fully running:  "modprobe $MODALIAS"

 * (b) sysfs attribute lets new-style coldplug recover from hotplug events

 *     mishandled before system is fully running:  "modprobe $(cat modalias)"

 */

static ssize_t

modalias_show(struct device *dev, struct device_attribute *a, char *buf)

{

        struct platform_device  *pdev = to_platform_device(dev);

        int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);

        return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;

}

static struct device_attribute platform_dev_attrs[] = {

        __ATTR_RO(modalias),

        __ATTR_NULL,

};

static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)

{

        struct platform_device  *pdev = to_platform_device(dev);

        add_uevent_var(env, "MODALIAS=platform:%s", pdev->name);

        return 0;

}

/**

 *      platform_match - bind platform device to platform driver.

 *      @dev:   device.

 *      @drv:   driver.

 *

 *      Platform device IDs are assumed to be encoded like this:

 *      "<name><instance>", where <name> is a short description of the

 *      type of device, like "pci" or "floppy", and <instance> is the

 *      enumerated instance of the device, like '0' or '42'.

 *      Driver IDs are simply "<name>".

 *      So, extract the <name> from the platform_device structure,

 *      and compare it against the name of the driver. Return whether

 *      they match or not.

 */

static int platform_match(struct device * dev, struct device_driver * drv)

{

        struct platform_device *pdev = container_of(dev, struct platform_device, dev);

        return (strncmp(pdev->name, drv->name, BUS_ID_SIZE) == 0);

}

static int platform_suspend(struct device *dev, pm_message_t mesg)

{

        int ret = 0;

        if (dev->driver && dev->driver->suspend)

                ret = dev->driver->suspend(dev, mesg);

        return ret;

}

static int platform_suspend_late(struct device *dev, pm_message_t mesg)

{

        struct platform_driver *drv = to_platform_driver(dev->driver);

        struct platform_device *pdev = container_of(dev, struct platform_device, dev);

        int ret = 0;

        if (dev->driver && drv->suspend_late)

                ret = drv->suspend_late(pdev, mesg);

        return ret;

}

static int platform_resume_early(struct device *dev)

{

        struct platform_driver *drv = to_platform_driver(dev->driver);

        struct platform_device *pdev = container_of(dev, struct platform_device, dev);

        int ret = 0;

        if (dev->driver && drv->resume_early)

                ret = drv->resume_early(pdev);

        return ret;

}

static int platform_resume(struct device * dev)

{

        int ret = 0;

        if (dev->driver && dev->driver->resume)

                ret = dev->driver->resume(dev);

        return ret;

}

struct bus_type platform_bus_type = {

        .name           = "platform",

        .dev_attrs      = platform_dev_attrs,

        .match          = platform_match,

        .uevent         = platform_uevent,

        .suspend        = platform_suspend,

        .suspend_late   = platform_suspend_late,

        .resume_early   = platform_resume_early,

        .resume         = platform_resume,

};

EXPORT_SYMBOL_GPL(platform_bus_type);

int __init platform_bus_init(void)

{

        int error;

        error = device_register(&platform_bus);

        if (error)

                return error;

        error =  bus_register(&platform_bus_type);

        if (error)

                device_unregister(&platform_bus);

        return error;

}

#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK

u64 dma_get_required_mask(struct device *dev)

{

        u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);

        u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));

        u64 mask;

        if (!high_totalram) {

                /* convert to mask just covering totalram */

                low_totalram = (1 << (fls(low_totalram) - 1));

                low_totalram += low_totalram - 1;

                mask = low_totalram;

        } else {

                high_totalram = (1 << (fls(high_totalram) - 1));

                high_totalram += high_totalram - 1;

                mask = (((u64)high_totalram) << 32) + 0xffffffff;

        }

        return mask & *dev->dma_mask;

}

EXPORT_SYMBOL_GPL(dma_get_required_mask);

#endif