mirror of https://gitee.com/openkylin/linux.git
[DRIVER MODEL] Improved dynamically allocated platform_device interface
Re-jig the simple platform device support to allow private data
to be attached to a platform device, as well as allowing the
parent device to be set.
Example usage:
pdev = platform_device_alloc("mydev", id);
if (pdev) {
err = platform_device_add_resources(pdev, &resources,
ARRAY_SIZE(resources));
if (err == 0)
err = platform_device_add_data(pdev, &platform_data,
sizeof(platform_data));
if (err == 0)
err = platform_device_add(pdev);
} else {
err = -ENOMEM;
}
if (err)
platform_device_put(pdev);
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Russell King
Russell King
parent
7015faa7df
commit
37c12e7497
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@ -116,12 +116,115 @@ int platform_add_devices(struct platform_device **devs, int num)
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return ret;
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}
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struct platform_object {
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struct platform_device pdev;
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char name[1];
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};
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/**
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* platform_device_register - add a platform-level device
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* platform_device_put
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* @pdev: platform device to free
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*
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* Free all memory associated with a platform device. This function
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* must _only_ be externally called in error cases. All other usage
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* is a bug.
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*/
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void platform_device_put(struct platform_device *pdev)
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{
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if (pdev)
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put_device(&pdev->dev);
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}
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EXPORT_SYMBOL_GPL(platform_device_put);
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static void platform_device_release(struct device *dev)
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{
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struct platform_object *pa = container_of(dev, struct platform_object, pdev.dev);
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kfree(pa->pdev.dev.platform_data);
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kfree(pa->pdev.resource);
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kfree(pa);
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}
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/**
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* platform_device_alloc
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* @name: base name of the device we're adding
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* @id: instance id
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*
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* Create a platform device object which can have other objects attached
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* to it, and which will have attached objects freed when it is released.
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*/
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struct platform_device *platform_device_alloc(const char *name, unsigned int id)
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{
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struct platform_object *pa;
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pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL);
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if (pa) {
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strcpy(pa->name, name);
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pa->pdev.name = pa->name;
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pa->pdev.id = id;
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device_initialize(&pa->pdev.dev);
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pa->pdev.dev.release = platform_device_release;
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}
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return pa ? &pa->pdev : NULL;
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}
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EXPORT_SYMBOL_GPL(platform_device_alloc);
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/**
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* platform_device_add_resources
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* @pdev: platform device allocated by platform_device_alloc to add resources to
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* @res: set of resources that needs to be allocated for the device
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* @num: number of resources
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*
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* Add a copy of the resources to the platform device. The memory
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* associated with the resources will be freed when the platform
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* device is released.
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*/
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int platform_device_add_resources(struct platform_device *pdev, struct resource *res, unsigned int num)
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{
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struct resource *r;
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r = kmalloc(sizeof(struct resource) * num, GFP_KERNEL);
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if (r) {
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memcpy(r, res, sizeof(struct resource) * num);
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pdev->resource = r;
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pdev->num_resources = num;
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}
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return r ? 0 : -ENOMEM;
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}
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EXPORT_SYMBOL_GPL(platform_device_add_resources);
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/**
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* platform_device_add_data
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* @pdev: platform device allocated by platform_device_alloc to add resources to
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* @data: platform specific data for this platform device
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* @size: size of platform specific data
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*
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* Add a copy of platform specific data to the platform device's platform_data
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* pointer. The memory associated with the platform data will be freed
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* when the platform device is released.
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*/
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int platform_device_add_data(struct platform_device *pdev, void *data, size_t size)
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{
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void *d;
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d = kmalloc(size, GFP_KERNEL);
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if (d) {
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memcpy(d, data, size);
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pdev->dev.platform_data = d;
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}
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return d ? 0 : -ENOMEM;
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}
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EXPORT_SYMBOL_GPL(platform_device_add_data);
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/**
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* platform_device_add - add a platform device to device hierarchy
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* @pdev: platform device we're adding
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*
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* This is part 2 of platform_device_register(), though may be called
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* separately _iff_ pdev was allocated by platform_device_alloc().
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*/
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int platform_device_register(struct platform_device * pdev)
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int platform_device_add(struct platform_device *pdev)
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{
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int i, ret = 0;
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@ -174,6 +277,18 @@ int platform_device_register(struct platform_device * pdev)
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release_resource(&pdev->resource[i]);
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return ret;
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}
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EXPORT_SYMBOL_GPL(platform_device_add);
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/**
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* platform_device_register - add a platform-level device
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* @pdev: platform device we're adding
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*
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*/
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int platform_device_register(struct platform_device * pdev)
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{
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device_initialize(&pdev->dev);
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return platform_device_add(pdev);
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}
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/**
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* platform_device_unregister - remove a platform-level device
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@ -197,18 +312,6 @@ void platform_device_unregister(struct platform_device * pdev)
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}
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}
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struct platform_object {
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struct platform_device pdev;
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struct resource resources[0];
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};
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static void platform_device_release_simple(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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kfree(container_of(pdev, struct platform_object, pdev));
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}
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/**
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* platform_device_register_simple
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* @name: base name of the device we're adding
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@ -225,33 +328,29 @@ static void platform_device_release_simple(struct device *dev)
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struct platform_device *platform_device_register_simple(char *name, unsigned int id,
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struct resource *res, unsigned int num)
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{
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struct platform_object *pobj;
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struct platform_device *pdev;
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int retval;
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pobj = kzalloc(sizeof(*pobj) + sizeof(struct resource) * num, GFP_KERNEL);
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if (!pobj) {
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pdev = platform_device_alloc(name, id);
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if (!pdev) {
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retval = -ENOMEM;
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goto error;
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}
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pobj->pdev.name = name;
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pobj->pdev.id = id;
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pobj->pdev.dev.release = platform_device_release_simple;
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if (num) {
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memcpy(pobj->resources, res, sizeof(struct resource) * num);
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pobj->pdev.resource = pobj->resources;
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pobj->pdev.num_resources = num;
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retval = platform_device_add_resources(pdev, res, num);
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if (retval)
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goto error;
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}
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retval = platform_device_register(&pobj->pdev);
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retval = platform_device_add(pdev);
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if (retval)
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goto error;
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return &pobj->pdev;
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return pdev;
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error:
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kfree(pobj);
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platform_device_put(pdev);
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return ERR_PTR(retval);
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}
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@ -37,4 +37,10 @@ extern int platform_add_devices(struct platform_device **, int);
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extern struct platform_device *platform_device_register_simple(char *, unsigned int, struct resource *, unsigned int);
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extern struct platform_device *platform_device_alloc(const char *name, unsigned int id);
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extern int platform_device_add_resources(struct platform_device *pdev, struct resource *res, unsigned int num);
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extern int platform_device_add_data(struct platform_device *pdev, void *data, size_t size);
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extern int platform_device_add(struct platform_device *pdev);
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extern void platform_device_put(struct platform_device *pdev);
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#endif /* _PLATFORM_DEVICE_H_ */
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