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drivers/base/platform.c
28.7 KB
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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. */ |
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#include <linux/string.h> |
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#include <linux/platform_device.h> |
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#include <linux/of_device.h> |
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#include <linux/module.h> #include <linux/init.h> #include <linux/dma-mapping.h> #include <linux/bootmem.h> #include <linux/err.h> |
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#include <linux/slab.h> |
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#include <linux/pm_runtime.h> |
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#include "base.h" |
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#define to_platform_driver(drv) (container_of((drv), struct platform_driver, \ driver)) |
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struct device platform_bus = { |
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.init_name = "platform", |
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}; |
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EXPORT_SYMBOL_GPL(platform_bus); |
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/** |
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* arch_setup_pdev_archdata - Allow manipulation of archdata before its used |
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* @pdev: platform device |
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* * This is called before platform_device_add() such that any pdev_archdata may * be setup before the platform_notifier is called. So if a user needs to * manipulate any relevant information in the pdev_archdata they can do: * * platform_devic_alloc() * ... manipulate ... * platform_device_add() * * And if they don't care they can just call platform_device_register() and * everything will just work out. */ void __weak arch_setup_pdev_archdata(struct platform_device *pdev) { } /** |
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* platform_get_resource - get a resource for a device * @dev: platform device * @type: resource type * @num: resource index |
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*/ |
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struct resource *platform_get_resource(struct platform_device *dev, unsigned int type, unsigned int num) |
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{ int i; for (i = 0; i < dev->num_resources; i++) { struct resource *r = &dev->resource[i]; |
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if (type == resource_type(r) && num-- == 0) return r; |
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} return NULL; } |
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EXPORT_SYMBOL_GPL(platform_get_resource); |
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/** |
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* platform_get_irq - get an IRQ for a device * @dev: platform device * @num: IRQ number index |
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*/ int platform_get_irq(struct platform_device *dev, unsigned int num) { struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num); |
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return r ? r->start : -ENXIO; |
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} |
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EXPORT_SYMBOL_GPL(platform_get_irq); |
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/** |
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* platform_get_resource_byname - get a resource for a device by name * @dev: platform device * @type: resource type * @name: resource name |
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*/ |
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struct resource *platform_get_resource_byname(struct platform_device *dev, |
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unsigned int type, const char *name) |
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{ int i; for (i = 0; i < dev->num_resources; i++) { struct resource *r = &dev->resource[i]; |
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if (type == resource_type(r) && !strcmp(r->name, name)) return r; |
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} return NULL; } |
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EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
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/** |
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* platform_get_irq - get an IRQ for a device * @dev: platform device * @name: IRQ name |
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*/ |
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int platform_get_irq_byname(struct platform_device *dev, const char *name) |
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{ |
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struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name); |
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return r ? r->start : -ENXIO; |
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} |
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EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
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/** |
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* platform_add_devices - add a numbers of platform devices * @devs: array of platform devices to add * @num: number of platform devices in array |
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*/ 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; } |
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EXPORT_SYMBOL_GPL(platform_add_devices); |
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struct platform_object { struct platform_device pdev; char name[1]; }; |
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/** |
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* platform_device_put - destroy a platform device |
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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 must * _only_ be externally called in error cases. All other usage is a bug. |
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*/ 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) { |
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struct platform_object *pa = container_of(dev, struct platform_object, pdev.dev); |
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of_device_node_put(&pa->pdev.dev); |
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kfree(pa->pdev.dev.platform_data); |
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kfree(pa->pdev.mfd_cell); |
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kfree(pa->pdev.resource); kfree(pa); } /** |
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* platform_device_alloc - create a platform device |
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* @name: base name of the device we're adding * @id: instance id |
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* |
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* Create a platform device object which can have other objects attached * 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, int id) |
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{ 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; |
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arch_setup_pdev_archdata(&pa->pdev); |
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} |
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return pa ? &pa->pdev : NULL; |
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} EXPORT_SYMBOL_GPL(platform_device_alloc); /** |
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* platform_device_add_resources - add resources to a platform device |
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* @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 |
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* |
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* 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. |
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*/ |
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int platform_device_add_resources(struct platform_device *pdev, |
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const struct resource *res, unsigned int num) |
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{ |
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struct resource *r = NULL; |
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if (res) { r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); if (!r) return -ENOMEM; |
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} |
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kfree(pdev->resource); |
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pdev->resource = r; pdev->num_resources = num; return 0; |
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} EXPORT_SYMBOL_GPL(platform_device_add_resources); /** |
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* platform_device_add_data - add platform-specific data to a platform device |
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* @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 |
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* |
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* 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. |
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*/ |
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int platform_device_add_data(struct platform_device *pdev, const void *data, size_t size) |
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{ |
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void *d = NULL; |
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if (data) { d = kmemdup(data, size, GFP_KERNEL); if (!d) return -ENOMEM; |
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} |
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kfree(pdev->dev.platform_data); |
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pdev->dev.platform_data = d; return 0; |
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} EXPORT_SYMBOL_GPL(platform_device_add_data); /** |
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* platform_device_add - add a platform device to device hierarchy * @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 * separately _iff_ pdev was allocated by platform_device_alloc(). |
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*/ |
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int platform_device_add(struct platform_device *pdev) |
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{ 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) |
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dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
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else |
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dev_set_name(&pdev->dev, "%s", pdev->name); |
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for (i = 0; i < pdev->num_resources; i++) { struct resource *p, *r = &pdev->resource[i]; if (r->name == NULL) |
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r->name = dev_name(&pdev->dev); |
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p = r->parent; if (!p) { |
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if (resource_type(r) == IORESOURCE_MEM) |
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p = &iomem_resource; |
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else if (resource_type(r) == IORESOURCE_IO) |
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p = &ioport_resource; } |
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if (p && insert_resource(p, r)) { |
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printk(KERN_ERR "%s: failed to claim resource %d ", |
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dev_name(&pdev->dev), i); |
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ret = -EBUSY; goto failed; } } pr_debug("Registering platform device '%s'. Parent at %s ", |
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dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
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ret = device_add(&pdev->dev); |
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if (ret == 0) return ret; failed: |
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while (--i >= 0) { struct resource *r = &pdev->resource[i]; unsigned long type = resource_type(r); if (type == IORESOURCE_MEM || type == IORESOURCE_IO) release_resource(r); } |
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return ret; } |
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EXPORT_SYMBOL_GPL(platform_device_add); /** |
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* platform_device_del - remove a platform-level device * @pdev: platform device we're removing |
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* |
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* 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. |
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*/ |
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void platform_device_del(struct platform_device *pdev) |
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{ int i; if (pdev) { |
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device_del(&pdev->dev); |
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for (i = 0; i < pdev->num_resources; i++) { struct resource *r = &pdev->resource[i]; |
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unsigned long type = resource_type(r); if (type == IORESOURCE_MEM || type == IORESOURCE_IO) |
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release_resource(r); } |
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} } |
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EXPORT_SYMBOL_GPL(platform_device_del); /** |
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* platform_device_register - add a platform-level device * @pdev: platform device we're adding |
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*/ |
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int platform_device_register(struct platform_device *pdev) |
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{ device_initialize(&pdev->dev); |
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arch_setup_pdev_archdata(pdev); |
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return platform_device_add(pdev); } |
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EXPORT_SYMBOL_GPL(platform_device_register); |
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/** |
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* platform_device_unregister - unregister a platform-level device * @pdev: platform device we're unregistering |
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* |
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* 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(). |
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*/ |
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void platform_device_unregister(struct platform_device *pdev) |
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{ platform_device_del(pdev); platform_device_put(pdev); } |
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EXPORT_SYMBOL_GPL(platform_device_unregister); |
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/** |
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* platform_device_register_full - add a platform-level device with |
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* resources and platform-specific data |
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* |
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* @pdevinfo: data used to create device |
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* |
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* Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
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*/ |
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struct platform_device *platform_device_register_full( |
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const struct platform_device_info *pdevinfo) |
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{ |
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int ret = -ENOMEM; |
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struct platform_device *pdev; |
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pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id); |
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if (!pdev) |
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goto err_alloc; pdev->dev.parent = pdevinfo->parent; if (pdevinfo->dma_mask) { /* * This memory isn't freed when the device is put, * I don't have a nice idea for that though. Conceptually * dma_mask in struct device should not be a pointer. * See http://thread.gmane.org/gmane.linux.kernel.pci/9081 */ pdev->dev.dma_mask = kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL); if (!pdev->dev.dma_mask) goto err; *pdev->dev.dma_mask = pdevinfo->dma_mask; pdev->dev.coherent_dma_mask = pdevinfo->dma_mask; } |
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ret = platform_device_add_resources(pdev, pdevinfo->res, pdevinfo->num_res); |
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if (ret) goto err; |
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ret = platform_device_add_data(pdev, pdevinfo->data, pdevinfo->size_data); |
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if (ret) goto err; |
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ret = platform_device_add(pdev); if (ret) { err: |
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kfree(pdev->dev.dma_mask); err_alloc: |
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platform_device_put(pdev); return ERR_PTR(ret); } |
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return pdev; |
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} |
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EXPORT_SYMBOL_GPL(platform_device_register_full); |
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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); } |
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static int platform_drv_probe_fail(struct device *_dev) { return -ENXIO; } |
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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); } |
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/** |
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* platform_driver_register - register a driver for platform-level devices |
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* @drv: platform driver structure |
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*/ 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; |
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return driver_register(&drv->driver); } EXPORT_SYMBOL_GPL(platform_driver_register); /** |
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* platform_driver_unregister - unregister a driver for platform-level devices |
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* @drv: platform driver structure |
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*/ void platform_driver_unregister(struct platform_driver *drv) { driver_unregister(&drv->driver); } EXPORT_SYMBOL_GPL(platform_driver_unregister); |
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/** * 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. */ |
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int __init_or_module platform_driver_probe(struct platform_driver *drv, |
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int (*probe)(struct platform_device *)) { int retval, code; |
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/* make sure driver won't have bind/unbind attributes */ drv->driver.suppress_bind_attrs = true; |
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/* temporary section violation during probe() */ drv->probe = probe; retval = code = platform_driver_register(drv); |
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/* * Fixup that section violation, being paranoid about code scanning |
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* 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. */ |
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spin_lock(&drv->driver.bus->p->klist_drivers.k_lock); |
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drv->probe = NULL; |
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if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
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retval = -ENODEV; drv->driver.probe = platform_drv_probe_fail; |
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spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock); |
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if (code != retval) platform_driver_unregister(drv); return retval; } EXPORT_SYMBOL_GPL(platform_driver_probe); |
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527 528 529 530 531 532 533 534 535 536 537 |
/** * platform_create_bundle - register driver and create corresponding device * @driver: platform driver structure * @probe: the driver probe routine, probably from an __init section * @res: set of resources that needs to be allocated for the device * @n_res: number of resources * @data: platform specific data for this platform device * @size: size of platform specific data * * Use this in legacy-style modules that probe hardware directly and * register a single platform device and corresponding platform driver. |
f0eae0ed3
|
538 539 |
* * Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
ecdf6ceb8
|
540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 |
*/ struct platform_device * __init_or_module platform_create_bundle( struct platform_driver *driver, int (*probe)(struct platform_device *), struct resource *res, unsigned int n_res, const void *data, size_t size) { struct platform_device *pdev; int error; pdev = platform_device_alloc(driver->driver.name, -1); if (!pdev) { error = -ENOMEM; goto err_out; } |
807508c8f
|
555 556 557 |
error = platform_device_add_resources(pdev, res, n_res); if (error) goto err_pdev_put; |
ecdf6ceb8
|
558 |
|
807508c8f
|
559 560 561 |
error = platform_device_add_data(pdev, data, size); if (error) goto err_pdev_put; |
ecdf6ceb8
|
562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 |
error = platform_device_add(pdev); if (error) goto err_pdev_put; error = platform_driver_probe(driver, probe); if (error) goto err_pdev_del; return pdev; err_pdev_del: platform_device_del(pdev); err_pdev_put: platform_device_put(pdev); err_out: return ERR_PTR(error); } EXPORT_SYMBOL_GPL(platform_create_bundle); |
a0245f7ad
|
581 582 583 584 585 586 |
/* 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)" */ |
4a3ad20cc
|
587 588 |
static ssize_t modalias_show(struct device *dev, struct device_attribute *a, char *buf) |
a0245f7ad
|
589 590 |
{ struct platform_device *pdev = to_platform_device(dev); |
43cc71eed
|
591 592 |
int len = snprintf(buf, PAGE_SIZE, "platform:%s ", pdev->name); |
a0245f7ad
|
593 594 595 596 597 598 599 600 |
return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; } static struct device_attribute platform_dev_attrs[] = { __ATTR_RO(modalias), __ATTR_NULL, }; |
7eff2e7a8
|
601 |
static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
a0245f7ad
|
602 603 |
{ struct platform_device *pdev = to_platform_device(dev); |
eca393016
|
604 605 606 607 608 609 |
int rc; /* Some devices have extra OF data and an OF-style MODALIAS */ rc = of_device_uevent(dev,env); if (rc != -ENODEV) return rc; |
a0245f7ad
|
610 |
|
57fee4a58
|
611 |
add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
0a26813c9
|
612 |
pdev->name); |
a0245f7ad
|
613 614 |
return 0; } |
57fee4a58
|
615 |
static const struct platform_device_id *platform_match_id( |
831fad2f7
|
616 |
const struct platform_device_id *id, |
57fee4a58
|
617 618 619 620 621 622 623 624 625 626 627 |
struct platform_device *pdev) { while (id->name[0]) { if (strcmp(pdev->name, id->name) == 0) { pdev->id_entry = id; return id; } id++; } return NULL; } |
1da177e4c
|
628 |
/** |
4a3ad20cc
|
629 630 631 |
* platform_match - bind platform device to platform driver. * @dev: device. * @drv: driver. |
1da177e4c
|
632 |
* |
4a3ad20cc
|
633 634 635 636 637 638 639 |
* 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. |
1da177e4c
|
640 |
*/ |
4a3ad20cc
|
641 |
static int platform_match(struct device *dev, struct device_driver *drv) |
1da177e4c
|
642 |
{ |
71b3e0c1a
|
643 |
struct platform_device *pdev = to_platform_device(dev); |
57fee4a58
|
644 |
struct platform_driver *pdrv = to_platform_driver(drv); |
05212157e
|
645 646 647 648 649 |
/* Attempt an OF style match first */ if (of_driver_match_device(dev, drv)) return 1; /* Then try to match against the id table */ |
57fee4a58
|
650 651 |
if (pdrv->id_table) return platform_match_id(pdrv->id_table, pdev) != NULL; |
1da177e4c
|
652 |
|
57fee4a58
|
653 |
/* fall-back to driver name match */ |
1e0b2cf93
|
654 |
return (strcmp(pdev->name, drv->name) == 0); |
1da177e4c
|
655 |
} |
25e18499e
|
656 657 658 |
#ifdef CONFIG_PM_SLEEP static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) |
1da177e4c
|
659 |
{ |
783ea7d4e
|
660 661 |
struct platform_driver *pdrv = to_platform_driver(dev->driver); struct platform_device *pdev = to_platform_device(dev); |
1da177e4c
|
662 |
int ret = 0; |
783ea7d4e
|
663 664 |
if (dev->driver && pdrv->suspend) ret = pdrv->suspend(pdev, mesg); |
386415d88
|
665 666 667 |
return ret; } |
25e18499e
|
668 |
static int platform_legacy_resume(struct device *dev) |
1da177e4c
|
669 |
{ |
783ea7d4e
|
670 671 |
struct platform_driver *pdrv = to_platform_driver(dev->driver); struct platform_device *pdev = to_platform_device(dev); |
1da177e4c
|
672 |
int ret = 0; |
783ea7d4e
|
673 674 |
if (dev->driver && pdrv->resume) ret = pdrv->resume(pdev); |
9480e307c
|
675 |
|
1da177e4c
|
676 677 |
return ret; } |
69c9dd1ec
|
678 |
#endif /* CONFIG_PM_SLEEP */ |
9d7302299
|
679 |
|
25e18499e
|
680 |
#ifdef CONFIG_SUSPEND |
69c9dd1ec
|
681 |
int platform_pm_suspend(struct device *dev) |
25e18499e
|
682 683 684 |
{ struct device_driver *drv = dev->driver; int ret = 0; |
adf094931
|
685 686 687 688 |
if (!drv) return 0; if (drv->pm) { |
25e18499e
|
689 690 691 692 693 694 695 696 |
if (drv->pm->suspend) ret = drv->pm->suspend(dev); } else { ret = platform_legacy_suspend(dev, PMSG_SUSPEND); } return ret; } |
69c9dd1ec
|
697 |
int platform_pm_resume(struct device *dev) |
25e18499e
|
698 699 700 |
{ struct device_driver *drv = dev->driver; int ret = 0; |
adf094931
|
701 702 703 704 |
if (!drv) return 0; if (drv->pm) { |
25e18499e
|
705 706 707 708 709 710 711 712 |
if (drv->pm->resume) ret = drv->pm->resume(dev); } else { ret = platform_legacy_resume(dev); } return ret; } |
69c9dd1ec
|
713 |
#endif /* CONFIG_SUSPEND */ |
25e18499e
|
714 |
|
1f112cee0
|
715 |
#ifdef CONFIG_HIBERNATE_CALLBACKS |
25e18499e
|
716 |
|
69c9dd1ec
|
717 |
int platform_pm_freeze(struct device *dev) |
25e18499e
|
718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 |
{ struct device_driver *drv = dev->driver; int ret = 0; if (!drv) return 0; if (drv->pm) { if (drv->pm->freeze) ret = drv->pm->freeze(dev); } else { ret = platform_legacy_suspend(dev, PMSG_FREEZE); } return ret; } |
69c9dd1ec
|
734 |
int platform_pm_thaw(struct device *dev) |
25e18499e
|
735 736 737 |
{ struct device_driver *drv = dev->driver; int ret = 0; |
adf094931
|
738 739 740 741 |
if (!drv) return 0; if (drv->pm) { |
25e18499e
|
742 743 744 745 746 747 748 749 |
if (drv->pm->thaw) ret = drv->pm->thaw(dev); } else { ret = platform_legacy_resume(dev); } return ret; } |
69c9dd1ec
|
750 |
int platform_pm_poweroff(struct device *dev) |
25e18499e
|
751 752 753 |
{ struct device_driver *drv = dev->driver; int ret = 0; |
adf094931
|
754 755 756 757 |
if (!drv) return 0; if (drv->pm) { |
25e18499e
|
758 759 760 761 762 763 764 765 |
if (drv->pm->poweroff) ret = drv->pm->poweroff(dev); } else { ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); } return ret; } |
69c9dd1ec
|
766 |
int platform_pm_restore(struct device *dev) |
25e18499e
|
767 768 769 |
{ struct device_driver *drv = dev->driver; int ret = 0; |
adf094931
|
770 771 772 773 |
if (!drv) return 0; if (drv->pm) { |
25e18499e
|
774 775 776 777 778 779 780 781 |
if (drv->pm->restore) ret = drv->pm->restore(dev); } else { ret = platform_legacy_resume(dev); } return ret; } |
69c9dd1ec
|
782 |
#endif /* CONFIG_HIBERNATE_CALLBACKS */ |
25e18499e
|
783 |
|
d9ab77161
|
784 |
static const struct dev_pm_ops platform_dev_pm_ops = { |
8b313a38e
|
785 786 787 |
.runtime_suspend = pm_generic_runtime_suspend, .runtime_resume = pm_generic_runtime_resume, .runtime_idle = pm_generic_runtime_idle, |
69c9dd1ec
|
788 |
USE_PLATFORM_PM_SLEEP_OPS |
25e18499e
|
789 |
}; |
1da177e4c
|
790 791 |
struct bus_type platform_bus_type = { .name = "platform", |
a0245f7ad
|
792 |
.dev_attrs = platform_dev_attrs, |
1da177e4c
|
793 |
.match = platform_match, |
a0245f7ad
|
794 |
.uevent = platform_uevent, |
9d7302299
|
795 |
.pm = &platform_dev_pm_ops, |
1da177e4c
|
796 |
}; |
a96b20420
|
797 |
EXPORT_SYMBOL_GPL(platform_bus_type); |
1da177e4c
|
798 799 800 |
int __init platform_bus_init(void) { |
fbfb14455
|
801 |
int error; |
13977091a
|
802 |
early_platform_cleanup(); |
fbfb14455
|
803 804 805 806 807 808 809 |
error = device_register(&platform_bus); if (error) return error; error = bus_register(&platform_bus_type); if (error) device_unregister(&platform_bus); return error; |
1da177e4c
|
810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 |
} #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; } |
e88a0c2ca
|
829 |
return mask; |
1da177e4c
|
830 831 832 |
} EXPORT_SYMBOL_GPL(dma_get_required_mask); #endif |
13977091a
|
833 834 835 836 837 |
static __initdata LIST_HEAD(early_platform_driver_list); static __initdata LIST_HEAD(early_platform_device_list); /** |
4d26e139f
|
838 |
* early_platform_driver_register - register early platform driver |
d86c1302c
|
839 |
* @epdrv: early_platform driver structure |
13977091a
|
840 |
* @buf: string passed from early_param() |
4d26e139f
|
841 842 |
* * Helper function for early_platform_init() / early_platform_init_buffer() |
13977091a
|
843 844 845 846 |
*/ int __init early_platform_driver_register(struct early_platform_driver *epdrv, char *buf) { |
c60e0504c
|
847 |
char *tmp; |
13977091a
|
848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 |
int n; /* Simply add the driver to the end of the global list. * Drivers will by default be put on the list in compiled-in order. */ if (!epdrv->list.next) { INIT_LIST_HEAD(&epdrv->list); list_add_tail(&epdrv->list, &early_platform_driver_list); } /* If the user has specified device then make sure the driver * gets prioritized. The driver of the last device specified on * command line will be put first on the list. */ n = strlen(epdrv->pdrv->driver.name); if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { list_move(&epdrv->list, &early_platform_driver_list); |
c60e0504c
|
865 866 |
/* Allow passing parameters after device name */ if (buf[n] == '\0' || buf[n] == ',') |
13977091a
|
867 |
epdrv->requested_id = -1; |
c60e0504c
|
868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 |
else { epdrv->requested_id = simple_strtoul(&buf[n + 1], &tmp, 10); if (buf[n] != '.' || (tmp == &buf[n + 1])) { epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; n = 0; } else n += strcspn(&buf[n + 1], ",") + 1; } if (buf[n] == ',') n++; if (epdrv->bufsize) { memcpy(epdrv->buffer, &buf[n], min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1)); epdrv->buffer[epdrv->bufsize - 1] = '\0'; } |
13977091a
|
887 888 889 890 891 892 |
} return 0; } /** |
4d26e139f
|
893 |
* early_platform_add_devices - adds a number of early platform devices |
13977091a
|
894 895 |
* @devs: array of early platform devices to add * @num: number of early platform devices in array |
4d26e139f
|
896 897 898 |
* * Used by early architecture code to register early platform devices and * their platform data. |
13977091a
|
899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 |
*/ void __init early_platform_add_devices(struct platform_device **devs, int num) { struct device *dev; int i; /* simply add the devices to list */ for (i = 0; i < num; i++) { dev = &devs[i]->dev; if (!dev->devres_head.next) { INIT_LIST_HEAD(&dev->devres_head); list_add_tail(&dev->devres_head, &early_platform_device_list); } } } /** |
4d26e139f
|
918 |
* early_platform_driver_register_all - register early platform drivers |
13977091a
|
919 |
* @class_str: string to identify early platform driver class |
4d26e139f
|
920 921 922 923 |
* * Used by architecture code to register all early platform drivers * for a certain class. If omitted then only early platform drivers * with matching kernel command line class parameters will be registered. |
13977091a
|
924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 |
*/ void __init early_platform_driver_register_all(char *class_str) { /* The "class_str" parameter may or may not be present on the kernel * command line. If it is present then there may be more than one * matching parameter. * * Since we register our early platform drivers using early_param() * we need to make sure that they also get registered in the case * when the parameter is missing from the kernel command line. * * We use parse_early_options() to make sure the early_param() gets * called at least once. The early_param() may be called more than * once since the name of the preferred device may be specified on * the kernel command line. early_platform_driver_register() handles * this case for us. */ parse_early_options(class_str); } /** |
4d26e139f
|
945 |
* early_platform_match - find early platform device matching driver |
d86c1302c
|
946 |
* @epdrv: early platform driver structure |
13977091a
|
947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 |
* @id: id to match against */ static __init struct platform_device * early_platform_match(struct early_platform_driver *epdrv, int id) { struct platform_device *pd; list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) if (platform_match(&pd->dev, &epdrv->pdrv->driver)) if (pd->id == id) return pd; return NULL; } /** |
4d26e139f
|
963 |
* early_platform_left - check if early platform driver has matching devices |
d86c1302c
|
964 |
* @epdrv: early platform driver structure |
13977091a
|
965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 |
* @id: return true if id or above exists */ static __init int early_platform_left(struct early_platform_driver *epdrv, int id) { struct platform_device *pd; list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) if (platform_match(&pd->dev, &epdrv->pdrv->driver)) if (pd->id >= id) return 1; return 0; } /** |
4d26e139f
|
981 |
* early_platform_driver_probe_id - probe drivers matching class_str and id |
13977091a
|
982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 |
* @class_str: string to identify early platform driver class * @id: id to match against * @nr_probe: number of platform devices to successfully probe before exiting */ static int __init early_platform_driver_probe_id(char *class_str, int id, int nr_probe) { struct early_platform_driver *epdrv; struct platform_device *match; int match_id; int n = 0; int left = 0; list_for_each_entry(epdrv, &early_platform_driver_list, list) { /* only use drivers matching our class_str */ if (strcmp(class_str, epdrv->class_str)) continue; if (id == -2) { match_id = epdrv->requested_id; left = 1; } else { match_id = id; left += early_platform_left(epdrv, id); /* skip requested id */ switch (epdrv->requested_id) { case EARLY_PLATFORM_ID_ERROR: case EARLY_PLATFORM_ID_UNSET: break; default: if (epdrv->requested_id == id) match_id = EARLY_PLATFORM_ID_UNSET; } } switch (match_id) { case EARLY_PLATFORM_ID_ERROR: pr_warning("%s: unable to parse %s parameter ", class_str, epdrv->pdrv->driver.name); /* fall-through */ case EARLY_PLATFORM_ID_UNSET: match = NULL; break; default: match = early_platform_match(epdrv, match_id); } if (match) { |
a636ee7fb
|
1034 1035 1036 1037 1038 |
/* * Set up a sensible init_name to enable * dev_name() and others to be used before the * rest of the driver core is initialized. */ |
06fe53beb
|
1039 |
if (!match->dev.init_name && slab_is_available()) { |
a636ee7fb
|
1040 |
if (match->id != -1) |
bd05086bb
|
1041 1042 1043 1044 |
match->dev.init_name = kasprintf(GFP_KERNEL, "%s.%d", match->name, match->id); |
a636ee7fb
|
1045 |
else |
bd05086bb
|
1046 1047 1048 |
match->dev.init_name = kasprintf(GFP_KERNEL, "%s", match->name); |
a636ee7fb
|
1049 |
|
a636ee7fb
|
1050 1051 1052 |
if (!match->dev.init_name) return -ENOMEM; } |
bd05086bb
|
1053 |
|
13977091a
|
1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 |
if (epdrv->pdrv->probe(match)) pr_warning("%s: unable to probe %s early. ", class_str, match->name); else n++; } if (n >= nr_probe) break; } if (left) return n; else return -ENODEV; } /** |
4d26e139f
|
1073 |
* early_platform_driver_probe - probe a class of registered drivers |
13977091a
|
1074 1075 1076 |
* @class_str: string to identify early platform driver class * @nr_probe: number of platform devices to successfully probe before exiting * @user_only: only probe user specified early platform devices |
4d26e139f
|
1077 1078 1079 1080 |
* * Used by architecture code to probe registered early platform drivers * within a certain class. For probe to happen a registered early platform * device matching a registered early platform driver is needed. |
13977091a
|
1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 |
*/ int __init early_platform_driver_probe(char *class_str, int nr_probe, int user_only) { int k, n, i; n = 0; for (i = -2; n < nr_probe; i++) { k = early_platform_driver_probe_id(class_str, i, nr_probe - n); if (k < 0) break; n += k; if (user_only) break; } return n; } /** * early_platform_cleanup - clean up early platform code */ void __init early_platform_cleanup(void) { struct platform_device *pd, *pd2; /* clean up the devres list used to chain devices */ list_for_each_entry_safe(pd, pd2, &early_platform_device_list, dev.devres_head) { list_del(&pd->dev.devres_head); memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); } } |