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1524 lines
38 KiB
1524 lines
38 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* platform.c - platform 'pseudo' bus for legacy devices |
|
* |
|
* Copyright (c) 2002-3 Patrick Mochel |
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* Copyright (c) 2002-3 Open Source Development Labs |
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* |
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* Please see Documentation/driver-api/driver-model/platform.rst for more |
|
* information. |
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*/ |
|
|
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#include <linux/string.h> |
|
#include <linux/platform_device.h> |
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#include <linux/of_device.h> |
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#include <linux/of_irq.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/ioport.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/memblock.h> |
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#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 <linux/pm_domain.h> |
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#include <linux/idr.h> |
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#include <linux/acpi.h> |
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#include <linux/clk/clk-conf.h> |
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#include <linux/limits.h> |
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#include <linux/property.h> |
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#include <linux/kmemleak.h> |
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#include <linux/types.h> |
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|
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#include "base.h" |
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#include "power/power.h" |
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|
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/* For automatically allocated device IDs */ |
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static DEFINE_IDA(platform_devid_ida); |
|
|
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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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* platform_get_resource - get a resource for a device |
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* @dev: platform device |
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* @type: resource type |
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* @num: resource index |
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* |
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* Return: a pointer to the resource or NULL on failure. |
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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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{ |
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u32 i; |
|
|
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for (i = 0; i < dev->num_resources; i++) { |
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struct resource *r = &dev->resource[i]; |
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|
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if (type == resource_type(r) && num-- == 0) |
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return r; |
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} |
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return NULL; |
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} |
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EXPORT_SYMBOL_GPL(platform_get_resource); |
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|
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struct resource *platform_get_mem_or_io(struct platform_device *dev, |
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unsigned int num) |
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{ |
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u32 i; |
|
|
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for (i = 0; i < dev->num_resources; i++) { |
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struct resource *r = &dev->resource[i]; |
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|
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if ((resource_type(r) & (IORESOURCE_MEM|IORESOURCE_IO)) && num-- == 0) |
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return r; |
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} |
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return NULL; |
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} |
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EXPORT_SYMBOL_GPL(platform_get_mem_or_io); |
|
|
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#ifdef CONFIG_HAS_IOMEM |
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/** |
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* devm_platform_get_and_ioremap_resource - call devm_ioremap_resource() for a |
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* platform device and get resource |
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* |
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* @pdev: platform device to use both for memory resource lookup as well as |
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* resource management |
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* @index: resource index |
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* @res: optional output parameter to store a pointer to the obtained resource. |
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* |
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* Return: a pointer to the remapped memory or an ERR_PTR() encoded error code |
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* on failure. |
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*/ |
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void __iomem * |
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devm_platform_get_and_ioremap_resource(struct platform_device *pdev, |
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unsigned int index, struct resource **res) |
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{ |
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struct resource *r; |
|
|
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r = platform_get_resource(pdev, IORESOURCE_MEM, index); |
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if (res) |
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*res = r; |
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return devm_ioremap_resource(&pdev->dev, r); |
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} |
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EXPORT_SYMBOL_GPL(devm_platform_get_and_ioremap_resource); |
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|
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/** |
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* devm_platform_ioremap_resource - call devm_ioremap_resource() for a platform |
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* device |
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* |
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* @pdev: platform device to use both for memory resource lookup as well as |
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* resource management |
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* @index: resource index |
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* |
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* Return: a pointer to the remapped memory or an ERR_PTR() encoded error code |
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* on failure. |
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*/ |
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void __iomem *devm_platform_ioremap_resource(struct platform_device *pdev, |
|
unsigned int index) |
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{ |
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return devm_platform_get_and_ioremap_resource(pdev, index, NULL); |
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} |
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EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource); |
|
|
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/** |
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* devm_platform_ioremap_resource_byname - call devm_ioremap_resource for |
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* a platform device, retrieve the |
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* resource by name |
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* |
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* @pdev: platform device to use both for memory resource lookup as well as |
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* resource management |
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* @name: name of the resource |
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* |
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* Return: a pointer to the remapped memory or an ERR_PTR() encoded error code |
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* on failure. |
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*/ |
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void __iomem * |
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devm_platform_ioremap_resource_byname(struct platform_device *pdev, |
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const char *name) |
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{ |
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struct resource *res; |
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|
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM, name); |
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return devm_ioremap_resource(&pdev->dev, res); |
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} |
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EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource_byname); |
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#endif /* CONFIG_HAS_IOMEM */ |
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|
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/** |
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* platform_get_irq_optional - get an optional IRQ for a device |
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* @dev: platform device |
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* @num: IRQ number index |
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* |
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* Gets an IRQ for a platform device. Device drivers should check the return |
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* value for errors so as to not pass a negative integer value to the |
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* request_irq() APIs. This is the same as platform_get_irq(), except that it |
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* does not print an error message if an IRQ can not be obtained. |
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* |
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* For example:: |
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* |
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* int irq = platform_get_irq_optional(pdev, 0); |
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* if (irq < 0) |
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* return irq; |
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* |
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* Return: non-zero IRQ number on success, negative error number on failure. |
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*/ |
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int platform_get_irq_optional(struct platform_device *dev, unsigned int num) |
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{ |
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int ret; |
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#ifdef CONFIG_SPARC |
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/* sparc does not have irqs represented as IORESOURCE_IRQ resources */ |
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if (!dev || num >= dev->archdata.num_irqs) |
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goto out_not_found; |
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ret = dev->archdata.irqs[num]; |
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goto out; |
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#else |
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struct resource *r; |
|
|
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if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) { |
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ret = of_irq_get(dev->dev.of_node, num); |
|
if (ret > 0 || ret == -EPROBE_DEFER) |
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goto out; |
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} |
|
|
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r = platform_get_resource(dev, IORESOURCE_IRQ, num); |
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if (has_acpi_companion(&dev->dev)) { |
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if (r && r->flags & IORESOURCE_DISABLED) { |
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ret = acpi_irq_get(ACPI_HANDLE(&dev->dev), num, r); |
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if (ret) |
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goto out; |
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} |
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} |
|
|
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/* |
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* The resources may pass trigger flags to the irqs that need |
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* to be set up. It so happens that the trigger flags for |
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* IORESOURCE_BITS correspond 1-to-1 to the IRQF_TRIGGER* |
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* settings. |
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*/ |
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if (r && r->flags & IORESOURCE_BITS) { |
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struct irq_data *irqd; |
|
|
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irqd = irq_get_irq_data(r->start); |
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if (!irqd) |
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goto out_not_found; |
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irqd_set_trigger_type(irqd, r->flags & IORESOURCE_BITS); |
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} |
|
|
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if (r) { |
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ret = r->start; |
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goto out; |
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} |
|
|
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/* |
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* For the index 0 interrupt, allow falling back to GpioInt |
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* resources. While a device could have both Interrupt and GpioInt |
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* resources, making this fallback ambiguous, in many common cases |
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* the device will only expose one IRQ, and this fallback |
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* allows a common code path across either kind of resource. |
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*/ |
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if (num == 0 && has_acpi_companion(&dev->dev)) { |
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ret = acpi_dev_gpio_irq_get(ACPI_COMPANION(&dev->dev), num); |
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/* Our callers expect -ENXIO for missing IRQs. */ |
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if (ret >= 0 || ret == -EPROBE_DEFER) |
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goto out; |
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} |
|
|
|
#endif |
|
out_not_found: |
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ret = -ENXIO; |
|
out: |
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WARN(ret == 0, "0 is an invalid IRQ number\n"); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(platform_get_irq_optional); |
|
|
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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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* |
|
* Gets an IRQ for a platform device and prints an error message if finding the |
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* IRQ fails. Device drivers should check the return value for errors so as to |
|
* not pass a negative integer value to the request_irq() APIs. |
|
* |
|
* For example:: |
|
* |
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* int irq = platform_get_irq(pdev, 0); |
|
* if (irq < 0) |
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* return irq; |
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* |
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* Return: non-zero IRQ number on success, negative error number on failure. |
|
*/ |
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int platform_get_irq(struct platform_device *dev, unsigned int num) |
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{ |
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int ret; |
|
|
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ret = platform_get_irq_optional(dev, num); |
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if (ret < 0 && ret != -EPROBE_DEFER) |
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dev_err(&dev->dev, "IRQ index %u not found\n", num); |
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|
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(platform_get_irq); |
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|
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/** |
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* platform_irq_count - Count the number of IRQs a platform device uses |
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* @dev: platform device |
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* |
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* Return: Number of IRQs a platform device uses or EPROBE_DEFER |
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*/ |
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int platform_irq_count(struct platform_device *dev) |
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{ |
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int ret, nr = 0; |
|
|
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while ((ret = platform_get_irq_optional(dev, nr)) >= 0) |
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nr++; |
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|
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if (ret == -EPROBE_DEFER) |
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return ret; |
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|
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return nr; |
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} |
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EXPORT_SYMBOL_GPL(platform_irq_count); |
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|
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struct irq_affinity_devres { |
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unsigned int count; |
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unsigned int irq[]; |
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}; |
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|
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static void platform_disable_acpi_irq(struct platform_device *pdev, int index) |
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{ |
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struct resource *r; |
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|
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r = platform_get_resource(pdev, IORESOURCE_IRQ, index); |
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if (r) |
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irqresource_disabled(r, 0); |
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} |
|
|
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static void devm_platform_get_irqs_affinity_release(struct device *dev, |
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void *res) |
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{ |
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struct irq_affinity_devres *ptr = res; |
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int i; |
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|
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for (i = 0; i < ptr->count; i++) { |
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irq_dispose_mapping(ptr->irq[i]); |
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|
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if (has_acpi_companion(dev)) |
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platform_disable_acpi_irq(to_platform_device(dev), i); |
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} |
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} |
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|
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/** |
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* devm_platform_get_irqs_affinity - devm method to get a set of IRQs for a |
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* device using an interrupt affinity descriptor |
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* @dev: platform device pointer |
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* @affd: affinity descriptor |
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* @minvec: minimum count of interrupt vectors |
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* @maxvec: maximum count of interrupt vectors |
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* @irqs: pointer holder for IRQ numbers |
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* |
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* Gets a set of IRQs for a platform device, and updates IRQ afffinty according |
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* to the passed affinity descriptor |
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* |
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* Return: Number of vectors on success, negative error number on failure. |
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*/ |
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int devm_platform_get_irqs_affinity(struct platform_device *dev, |
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struct irq_affinity *affd, |
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unsigned int minvec, |
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unsigned int maxvec, |
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int **irqs) |
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{ |
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struct irq_affinity_devres *ptr; |
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struct irq_affinity_desc *desc; |
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size_t size; |
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int i, ret, nvec; |
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|
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if (!affd) |
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return -EPERM; |
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|
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if (maxvec < minvec) |
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return -ERANGE; |
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|
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nvec = platform_irq_count(dev); |
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if (nvec < 0) |
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return nvec; |
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|
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if (nvec < minvec) |
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return -ENOSPC; |
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|
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nvec = irq_calc_affinity_vectors(minvec, nvec, affd); |
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if (nvec < minvec) |
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return -ENOSPC; |
|
|
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if (nvec > maxvec) |
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nvec = maxvec; |
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|
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size = sizeof(*ptr) + sizeof(unsigned int) * nvec; |
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ptr = devres_alloc(devm_platform_get_irqs_affinity_release, size, |
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GFP_KERNEL); |
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if (!ptr) |
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return -ENOMEM; |
|
|
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ptr->count = nvec; |
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|
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for (i = 0; i < nvec; i++) { |
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int irq = platform_get_irq(dev, i); |
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if (irq < 0) { |
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ret = irq; |
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goto err_free_devres; |
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} |
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ptr->irq[i] = irq; |
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} |
|
|
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desc = irq_create_affinity_masks(nvec, affd); |
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if (!desc) { |
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ret = -ENOMEM; |
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goto err_free_devres; |
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} |
|
|
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for (i = 0; i < nvec; i++) { |
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ret = irq_update_affinity_desc(ptr->irq[i], &desc[i]); |
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if (ret) { |
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dev_err(&dev->dev, "failed to update irq%d affinity descriptor (%d)\n", |
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ptr->irq[i], ret); |
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goto err_free_desc; |
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} |
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} |
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|
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devres_add(&dev->dev, ptr); |
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|
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kfree(desc); |
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|
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*irqs = ptr->irq; |
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|
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return nvec; |
|
|
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err_free_desc: |
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kfree(desc); |
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err_free_devres: |
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devres_free(ptr); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(devm_platform_get_irqs_affinity); |
|
|
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/** |
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* platform_get_resource_byname - get a resource for a device by name |
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* @dev: platform device |
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* @type: resource type |
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* @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, |
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const char *name) |
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{ |
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u32 i; |
|
|
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for (i = 0; i < dev->num_resources; i++) { |
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struct resource *r = &dev->resource[i]; |
|
|
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if (unlikely(!r->name)) |
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continue; |
|
|
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if (type == resource_type(r) && !strcmp(r->name, name)) |
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return r; |
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} |
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return NULL; |
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} |
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EXPORT_SYMBOL_GPL(platform_get_resource_byname); |
|
|
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static int __platform_get_irq_byname(struct platform_device *dev, |
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const char *name) |
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{ |
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struct resource *r; |
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int ret; |
|
|
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if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) { |
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ret = of_irq_get_byname(dev->dev.of_node, name); |
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if (ret > 0 || ret == -EPROBE_DEFER) |
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return ret; |
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} |
|
|
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r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name); |
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if (r) { |
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WARN(r->start == 0, "0 is an invalid IRQ number\n"); |
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return r->start; |
|
} |
|
|
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return -ENXIO; |
|
} |
|
|
|
/** |
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* platform_get_irq_byname - get an IRQ for a device by name |
|
* @dev: platform device |
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* @name: IRQ name |
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* |
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* Get an IRQ like platform_get_irq(), but then by name rather then by index. |
|
* |
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* Return: non-zero IRQ number on success, negative error number on failure. |
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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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int ret; |
|
|
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ret = __platform_get_irq_byname(dev, name); |
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if (ret < 0 && ret != -EPROBE_DEFER) |
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dev_err(&dev->dev, "IRQ %s not found\n", name); |
|
|
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(platform_get_irq_byname); |
|
|
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/** |
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* platform_get_irq_byname_optional - get an optional IRQ for a device by name |
|
* @dev: platform device |
|
* @name: IRQ name |
|
* |
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* Get an optional IRQ by name like platform_get_irq_byname(). Except that it |
|
* does not print an error message if an IRQ can not be obtained. |
|
* |
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* Return: non-zero IRQ number on success, negative error number on failure. |
|
*/ |
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int platform_get_irq_byname_optional(struct platform_device *dev, |
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const char *name) |
|
{ |
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return __platform_get_irq_byname(dev, name); |
|
} |
|
EXPORT_SYMBOL_GPL(platform_get_irq_byname_optional); |
|
|
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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 |
|
*/ |
|
int platform_add_devices(struct platform_device **devs, int num) |
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{ |
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int i, ret = 0; |
|
|
|
for (i = 0; i < num; i++) { |
|
ret = platform_device_register(devs[i]); |
|
if (ret) { |
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while (--i >= 0) |
|
platform_device_unregister(devs[i]); |
|
break; |
|
} |
|
} |
|
|
|
return ret; |
|
} |
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EXPORT_SYMBOL_GPL(platform_add_devices); |
|
|
|
struct platform_object { |
|
struct platform_device pdev; |
|
char name[]; |
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}; |
|
|
|
/* |
|
* Set up default DMA mask for platform devices if the they weren't |
|
* previously set by the architecture / DT. |
|
*/ |
|
static void setup_pdev_dma_masks(struct platform_device *pdev) |
|
{ |
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pdev->dev.dma_parms = &pdev->dma_parms; |
|
|
|
if (!pdev->dev.coherent_dma_mask) |
|
pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); |
|
if (!pdev->dev.dma_mask) { |
|
pdev->platform_dma_mask = DMA_BIT_MASK(32); |
|
pdev->dev.dma_mask = &pdev->platform_dma_mask; |
|
} |
|
}; |
|
|
|
/** |
|
* platform_device_put - destroy a platform device |
|
* @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 (!IS_ERR_OR_NULL(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); |
|
|
|
of_node_put(pa->pdev.dev.of_node); |
|
kfree(pa->pdev.dev.platform_data); |
|
kfree(pa->pdev.mfd_cell); |
|
kfree(pa->pdev.resource); |
|
kfree(pa->pdev.driver_override); |
|
kfree(pa); |
|
} |
|
|
|
/** |
|
* platform_device_alloc - create a platform device |
|
* @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(*pa) + strlen(name) + 1, 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; |
|
setup_pdev_dma_masks(&pa->pdev); |
|
} |
|
|
|
return pa ? &pa->pdev : NULL; |
|
} |
|
EXPORT_SYMBOL_GPL(platform_device_alloc); |
|
|
|
/** |
|
* platform_device_add_resources - add resources to a platform device |
|
* @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, |
|
const struct resource *res, unsigned int num) |
|
{ |
|
struct resource *r = NULL; |
|
|
|
if (res) { |
|
r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); |
|
if (!r) |
|
return -ENOMEM; |
|
} |
|
|
|
kfree(pdev->resource); |
|
pdev->resource = r; |
|
pdev->num_resources = num; |
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(platform_device_add_resources); |
|
|
|
/** |
|
* platform_device_add_data - add platform-specific data to a platform device |
|
* @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 = NULL; |
|
|
|
if (data) { |
|
d = kmemdup(data, size, GFP_KERNEL); |
|
if (!d) |
|
return -ENOMEM; |
|
} |
|
|
|
kfree(pdev->dev.platform_data); |
|
pdev->dev.platform_data = d; |
|
return 0; |
|
} |
|
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) |
|
{ |
|
u32 i; |
|
int ret; |
|
|
|
if (!pdev) |
|
return -EINVAL; |
|
|
|
if (!pdev->dev.parent) |
|
pdev->dev.parent = &platform_bus; |
|
|
|
pdev->dev.bus = &platform_bus_type; |
|
|
|
switch (pdev->id) { |
|
default: |
|
dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); |
|
break; |
|
case PLATFORM_DEVID_NONE: |
|
dev_set_name(&pdev->dev, "%s", pdev->name); |
|
break; |
|
case PLATFORM_DEVID_AUTO: |
|
/* |
|
* Automatically allocated device ID. We mark it as such so |
|
* that we remember it must be freed, and we append a suffix |
|
* to avoid namespace collision with explicit IDs. |
|
*/ |
|
ret = ida_alloc(&platform_devid_ida, GFP_KERNEL); |
|
if (ret < 0) |
|
goto err_out; |
|
pdev->id = ret; |
|
pdev->id_auto = true; |
|
dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id); |
|
break; |
|
} |
|
|
|
for (i = 0; i < pdev->num_resources; i++) { |
|
struct resource *p, *r = &pdev->resource[i]; |
|
|
|
if (r->name == NULL) |
|
r->name = dev_name(&pdev->dev); |
|
|
|
p = r->parent; |
|
if (!p) { |
|
if (resource_type(r) == IORESOURCE_MEM) |
|
p = &iomem_resource; |
|
else if (resource_type(r) == IORESOURCE_IO) |
|
p = &ioport_resource; |
|
} |
|
|
|
if (p) { |
|
ret = insert_resource(p, r); |
|
if (ret) { |
|
dev_err(&pdev->dev, "failed to claim resource %d: %pR\n", i, r); |
|
goto failed; |
|
} |
|
} |
|
} |
|
|
|
pr_debug("Registering platform device '%s'. Parent at %s\n", |
|
dev_name(&pdev->dev), dev_name(pdev->dev.parent)); |
|
|
|
ret = device_add(&pdev->dev); |
|
if (ret == 0) |
|
return ret; |
|
|
|
failed: |
|
if (pdev->id_auto) { |
|
ida_free(&platform_devid_ida, pdev->id); |
|
pdev->id = PLATFORM_DEVID_AUTO; |
|
} |
|
|
|
while (i--) { |
|
struct resource *r = &pdev->resource[i]; |
|
if (r->parent) |
|
release_resource(r); |
|
} |
|
|
|
err_out: |
|
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) |
|
{ |
|
u32 i; |
|
|
|
if (!IS_ERR_OR_NULL(pdev)) { |
|
device_del(&pdev->dev); |
|
|
|
if (pdev->id_auto) { |
|
ida_free(&platform_devid_ida, pdev->id); |
|
pdev->id = PLATFORM_DEVID_AUTO; |
|
} |
|
|
|
for (i = 0; i < pdev->num_resources; i++) { |
|
struct resource *r = &pdev->resource[i]; |
|
if (r->parent) |
|
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); |
|
setup_pdev_dma_masks(pdev); |
|
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_full - add a platform-level device with |
|
* resources and platform-specific data |
|
* |
|
* @pdevinfo: data used to create device |
|
* |
|
* Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
|
*/ |
|
struct platform_device *platform_device_register_full( |
|
const struct platform_device_info *pdevinfo) |
|
{ |
|
int ret; |
|
struct platform_device *pdev; |
|
|
|
pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id); |
|
if (!pdev) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
pdev->dev.parent = pdevinfo->parent; |
|
pdev->dev.fwnode = pdevinfo->fwnode; |
|
pdev->dev.of_node = of_node_get(to_of_node(pdev->dev.fwnode)); |
|
pdev->dev.of_node_reused = pdevinfo->of_node_reused; |
|
|
|
if (pdevinfo->dma_mask) { |
|
pdev->platform_dma_mask = pdevinfo->dma_mask; |
|
pdev->dev.dma_mask = &pdev->platform_dma_mask; |
|
pdev->dev.coherent_dma_mask = pdevinfo->dma_mask; |
|
} |
|
|
|
ret = platform_device_add_resources(pdev, |
|
pdevinfo->res, pdevinfo->num_res); |
|
if (ret) |
|
goto err; |
|
|
|
ret = platform_device_add_data(pdev, |
|
pdevinfo->data, pdevinfo->size_data); |
|
if (ret) |
|
goto err; |
|
|
|
if (pdevinfo->properties) { |
|
ret = device_create_managed_software_node(&pdev->dev, |
|
pdevinfo->properties, NULL); |
|
if (ret) |
|
goto err; |
|
} |
|
|
|
ret = platform_device_add(pdev); |
|
if (ret) { |
|
err: |
|
ACPI_COMPANION_SET(&pdev->dev, NULL); |
|
platform_device_put(pdev); |
|
return ERR_PTR(ret); |
|
} |
|
|
|
return pdev; |
|
} |
|
EXPORT_SYMBOL_GPL(platform_device_register_full); |
|
|
|
/** |
|
* __platform_driver_register - register a driver for platform-level devices |
|
* @drv: platform driver structure |
|
* @owner: owning module/driver |
|
*/ |
|
int __platform_driver_register(struct platform_driver *drv, |
|
struct module *owner) |
|
{ |
|
drv->driver.owner = owner; |
|
drv->driver.bus = &platform_bus_type; |
|
|
|
return driver_register(&drv->driver); |
|
} |
|
EXPORT_SYMBOL_GPL(__platform_driver_register); |
|
|
|
/** |
|
* platform_driver_unregister - unregister a driver for platform-level devices |
|
* @drv: platform driver structure |
|
*/ |
|
void platform_driver_unregister(struct platform_driver *drv) |
|
{ |
|
driver_unregister(&drv->driver); |
|
} |
|
EXPORT_SYMBOL_GPL(platform_driver_unregister); |
|
|
|
static int platform_probe_fail(struct platform_device *pdev) |
|
{ |
|
return -ENXIO; |
|
} |
|
|
|
/** |
|
* __platform_driver_probe - register driver for non-hotpluggable device |
|
* @drv: platform driver structure |
|
* @probe: the driver probe routine, probably from an __init section |
|
* @module: module which will be the owner of the driver |
|
* |
|
* 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. |
|
* |
|
* Note that this is incompatible with deferred probing. |
|
* |
|
* 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 *), struct module *module) |
|
{ |
|
int retval, code; |
|
|
|
if (drv->driver.probe_type == PROBE_PREFER_ASYNCHRONOUS) { |
|
pr_err("%s: drivers registered with %s can not be probed asynchronously\n", |
|
drv->driver.name, __func__); |
|
return -EINVAL; |
|
} |
|
|
|
/* |
|
* We have to run our probes synchronously because we check if |
|
* we find any devices to bind to and exit with error if there |
|
* are any. |
|
*/ |
|
drv->driver.probe_type = PROBE_FORCE_SYNCHRONOUS; |
|
|
|
/* |
|
* Prevent driver from requesting probe deferral to avoid further |
|
* futile probe attempts. |
|
*/ |
|
drv->prevent_deferred_probe = true; |
|
|
|
/* make sure driver won't have bind/unbind attributes */ |
|
drv->driver.suppress_bind_attrs = true; |
|
|
|
/* temporary section violation during probe() */ |
|
drv->probe = probe; |
|
retval = code = __platform_driver_register(drv, module); |
|
if (retval) |
|
return retval; |
|
|
|
/* |
|
* 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(&drv->driver.bus->p->klist_drivers.k_lock); |
|
drv->probe = platform_probe_fail; |
|
if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) |
|
retval = -ENODEV; |
|
spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock); |
|
|
|
if (code != retval) |
|
platform_driver_unregister(drv); |
|
return retval; |
|
} |
|
EXPORT_SYMBOL_GPL(__platform_driver_probe); |
|
|
|
/** |
|
* __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 |
|
* @module: module which will be the owner of the driver |
|
* |
|
* Use this in legacy-style modules that probe hardware directly and |
|
* register a single platform device and corresponding platform driver. |
|
* |
|
* Returns &struct platform_device pointer on success, or ERR_PTR() on error. |
|
*/ |
|
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 module *module) |
|
{ |
|
struct platform_device *pdev; |
|
int error; |
|
|
|
pdev = platform_device_alloc(driver->driver.name, -1); |
|
if (!pdev) { |
|
error = -ENOMEM; |
|
goto err_out; |
|
} |
|
|
|
error = platform_device_add_resources(pdev, res, n_res); |
|
if (error) |
|
goto err_pdev_put; |
|
|
|
error = platform_device_add_data(pdev, data, size); |
|
if (error) |
|
goto err_pdev_put; |
|
|
|
error = platform_device_add(pdev); |
|
if (error) |
|
goto err_pdev_put; |
|
|
|
error = __platform_driver_probe(driver, probe, module); |
|
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); |
|
|
|
/** |
|
* __platform_register_drivers - register an array of platform drivers |
|
* @drivers: an array of drivers to register |
|
* @count: the number of drivers to register |
|
* @owner: module owning the drivers |
|
* |
|
* Registers platform drivers specified by an array. On failure to register a |
|
* driver, all previously registered drivers will be unregistered. Callers of |
|
* this API should use platform_unregister_drivers() to unregister drivers in |
|
* the reverse order. |
|
* |
|
* Returns: 0 on success or a negative error code on failure. |
|
*/ |
|
int __platform_register_drivers(struct platform_driver * const *drivers, |
|
unsigned int count, struct module *owner) |
|
{ |
|
unsigned int i; |
|
int err; |
|
|
|
for (i = 0; i < count; i++) { |
|
pr_debug("registering platform driver %ps\n", drivers[i]); |
|
|
|
err = __platform_driver_register(drivers[i], owner); |
|
if (err < 0) { |
|
pr_err("failed to register platform driver %ps: %d\n", |
|
drivers[i], err); |
|
goto error; |
|
} |
|
} |
|
|
|
return 0; |
|
|
|
error: |
|
while (i--) { |
|
pr_debug("unregistering platform driver %ps\n", drivers[i]); |
|
platform_driver_unregister(drivers[i]); |
|
} |
|
|
|
return err; |
|
} |
|
EXPORT_SYMBOL_GPL(__platform_register_drivers); |
|
|
|
/** |
|
* platform_unregister_drivers - unregister an array of platform drivers |
|
* @drivers: an array of drivers to unregister |
|
* @count: the number of drivers to unregister |
|
* |
|
* Unregisters platform drivers specified by an array. This is typically used |
|
* to complement an earlier call to platform_register_drivers(). Drivers are |
|
* unregistered in the reverse order in which they were registered. |
|
*/ |
|
void platform_unregister_drivers(struct platform_driver * const *drivers, |
|
unsigned int count) |
|
{ |
|
while (count--) { |
|
pr_debug("unregistering platform driver %ps\n", drivers[count]); |
|
platform_driver_unregister(drivers[count]); |
|
} |
|
} |
|
EXPORT_SYMBOL_GPL(platform_unregister_drivers); |
|
|
|
static const struct platform_device_id *platform_match_id( |
|
const struct platform_device_id *id, |
|
struct platform_device *pdev) |
|
{ |
|
while (id->name[0]) { |
|
if (strcmp(pdev->name, id->name) == 0) { |
|
pdev->id_entry = id; |
|
return id; |
|
} |
|
id++; |
|
} |
|
return NULL; |
|
} |
|
|
|
#ifdef CONFIG_PM_SLEEP |
|
|
|
static int platform_legacy_suspend(struct device *dev, pm_message_t mesg) |
|
{ |
|
struct platform_driver *pdrv = to_platform_driver(dev->driver); |
|
struct platform_device *pdev = to_platform_device(dev); |
|
int ret = 0; |
|
|
|
if (dev->driver && pdrv->suspend) |
|
ret = pdrv->suspend(pdev, mesg); |
|
|
|
return ret; |
|
} |
|
|
|
static int platform_legacy_resume(struct device *dev) |
|
{ |
|
struct platform_driver *pdrv = to_platform_driver(dev->driver); |
|
struct platform_device *pdev = to_platform_device(dev); |
|
int ret = 0; |
|
|
|
if (dev->driver && pdrv->resume) |
|
ret = pdrv->resume(pdev); |
|
|
|
return ret; |
|
} |
|
|
|
#endif /* CONFIG_PM_SLEEP */ |
|
|
|
#ifdef CONFIG_SUSPEND |
|
|
|
int platform_pm_suspend(struct device *dev) |
|
{ |
|
struct device_driver *drv = dev->driver; |
|
int ret = 0; |
|
|
|
if (!drv) |
|
return 0; |
|
|
|
if (drv->pm) { |
|
if (drv->pm->suspend) |
|
ret = drv->pm->suspend(dev); |
|
} else { |
|
ret = platform_legacy_suspend(dev, PMSG_SUSPEND); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
int platform_pm_resume(struct device *dev) |
|
{ |
|
struct device_driver *drv = dev->driver; |
|
int ret = 0; |
|
|
|
if (!drv) |
|
return 0; |
|
|
|
if (drv->pm) { |
|
if (drv->pm->resume) |
|
ret = drv->pm->resume(dev); |
|
} else { |
|
ret = platform_legacy_resume(dev); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
#endif /* CONFIG_SUSPEND */ |
|
|
|
#ifdef CONFIG_HIBERNATE_CALLBACKS |
|
|
|
int platform_pm_freeze(struct device *dev) |
|
{ |
|
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; |
|
} |
|
|
|
int platform_pm_thaw(struct device *dev) |
|
{ |
|
struct device_driver *drv = dev->driver; |
|
int ret = 0; |
|
|
|
if (!drv) |
|
return 0; |
|
|
|
if (drv->pm) { |
|
if (drv->pm->thaw) |
|
ret = drv->pm->thaw(dev); |
|
} else { |
|
ret = platform_legacy_resume(dev); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
int platform_pm_poweroff(struct device *dev) |
|
{ |
|
struct device_driver *drv = dev->driver; |
|
int ret = 0; |
|
|
|
if (!drv) |
|
return 0; |
|
|
|
if (drv->pm) { |
|
if (drv->pm->poweroff) |
|
ret = drv->pm->poweroff(dev); |
|
} else { |
|
ret = platform_legacy_suspend(dev, PMSG_HIBERNATE); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
int platform_pm_restore(struct device *dev) |
|
{ |
|
struct device_driver *drv = dev->driver; |
|
int ret = 0; |
|
|
|
if (!drv) |
|
return 0; |
|
|
|
if (drv->pm) { |
|
if (drv->pm->restore) |
|
ret = drv->pm->restore(dev); |
|
} else { |
|
ret = platform_legacy_resume(dev); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
#endif /* CONFIG_HIBERNATE_CALLBACKS */ |
|
|
|
/* 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 *attr, char *buf) |
|
{ |
|
struct platform_device *pdev = to_platform_device(dev); |
|
int len; |
|
|
|
len = of_device_modalias(dev, buf, PAGE_SIZE); |
|
if (len != -ENODEV) |
|
return len; |
|
|
|
len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1); |
|
if (len != -ENODEV) |
|
return len; |
|
|
|
return sysfs_emit(buf, "platform:%s\n", pdev->name); |
|
} |
|
static DEVICE_ATTR_RO(modalias); |
|
|
|
static ssize_t numa_node_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
return sysfs_emit(buf, "%d\n", dev_to_node(dev)); |
|
} |
|
static DEVICE_ATTR_RO(numa_node); |
|
|
|
static ssize_t driver_override_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct platform_device *pdev = to_platform_device(dev); |
|
ssize_t len; |
|
|
|
device_lock(dev); |
|
len = sysfs_emit(buf, "%s\n", pdev->driver_override); |
|
device_unlock(dev); |
|
|
|
return len; |
|
} |
|
|
|
static ssize_t driver_override_store(struct device *dev, |
|
struct device_attribute *attr, |
|
const char *buf, size_t count) |
|
{ |
|
struct platform_device *pdev = to_platform_device(dev); |
|
char *driver_override, *old, *cp; |
|
|
|
/* We need to keep extra room for a newline */ |
|
if (count >= (PAGE_SIZE - 1)) |
|
return -EINVAL; |
|
|
|
driver_override = kstrndup(buf, count, GFP_KERNEL); |
|
if (!driver_override) |
|
return -ENOMEM; |
|
|
|
cp = strchr(driver_override, '\n'); |
|
if (cp) |
|
*cp = '\0'; |
|
|
|
device_lock(dev); |
|
old = pdev->driver_override; |
|
if (strlen(driver_override)) { |
|
pdev->driver_override = driver_override; |
|
} else { |
|
kfree(driver_override); |
|
pdev->driver_override = NULL; |
|
} |
|
device_unlock(dev); |
|
|
|
kfree(old); |
|
|
|
return count; |
|
} |
|
static DEVICE_ATTR_RW(driver_override); |
|
|
|
static struct attribute *platform_dev_attrs[] = { |
|
&dev_attr_modalias.attr, |
|
&dev_attr_numa_node.attr, |
|
&dev_attr_driver_override.attr, |
|
NULL, |
|
}; |
|
|
|
static umode_t platform_dev_attrs_visible(struct kobject *kobj, struct attribute *a, |
|
int n) |
|
{ |
|
struct device *dev = container_of(kobj, typeof(*dev), kobj); |
|
|
|
if (a == &dev_attr_numa_node.attr && |
|
dev_to_node(dev) == NUMA_NO_NODE) |
|
return 0; |
|
|
|
return a->mode; |
|
} |
|
|
|
static const struct attribute_group platform_dev_group = { |
|
.attrs = platform_dev_attrs, |
|
.is_visible = platform_dev_attrs_visible, |
|
}; |
|
__ATTRIBUTE_GROUPS(platform_dev); |
|
|
|
|
|
/** |
|
* 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 = to_platform_device(dev); |
|
struct platform_driver *pdrv = to_platform_driver(drv); |
|
|
|
/* When driver_override is set, only bind to the matching driver */ |
|
if (pdev->driver_override) |
|
return !strcmp(pdev->driver_override, drv->name); |
|
|
|
/* Attempt an OF style match first */ |
|
if (of_driver_match_device(dev, drv)) |
|
return 1; |
|
|
|
/* Then try ACPI style match */ |
|
if (acpi_driver_match_device(dev, drv)) |
|
return 1; |
|
|
|
/* Then try to match against the id table */ |
|
if (pdrv->id_table) |
|
return platform_match_id(pdrv->id_table, pdev) != NULL; |
|
|
|
/* fall-back to driver name match */ |
|
return (strcmp(pdev->name, drv->name) == 0); |
|
} |
|
|
|
static int platform_uevent(struct device *dev, struct kobj_uevent_env *env) |
|
{ |
|
struct platform_device *pdev = to_platform_device(dev); |
|
int rc; |
|
|
|
/* Some devices have extra OF data and an OF-style MODALIAS */ |
|
rc = of_device_uevent_modalias(dev, env); |
|
if (rc != -ENODEV) |
|
return rc; |
|
|
|
rc = acpi_device_uevent_modalias(dev, env); |
|
if (rc != -ENODEV) |
|
return rc; |
|
|
|
add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX, |
|
pdev->name); |
|
return 0; |
|
} |
|
|
|
static int platform_probe(struct device *_dev) |
|
{ |
|
struct platform_driver *drv = to_platform_driver(_dev->driver); |
|
struct platform_device *dev = to_platform_device(_dev); |
|
int ret; |
|
|
|
/* |
|
* A driver registered using platform_driver_probe() cannot be bound |
|
* again later because the probe function usually lives in __init code |
|
* and so is gone. For these drivers .probe is set to |
|
* platform_probe_fail in __platform_driver_probe(). Don't even prepare |
|
* clocks and PM domains for these to match the traditional behaviour. |
|
*/ |
|
if (unlikely(drv->probe == platform_probe_fail)) |
|
return -ENXIO; |
|
|
|
ret = of_clk_set_defaults(_dev->of_node, false); |
|
if (ret < 0) |
|
return ret; |
|
|
|
ret = dev_pm_domain_attach(_dev, true); |
|
if (ret) |
|
goto out; |
|
|
|
if (drv->probe) { |
|
ret = drv->probe(dev); |
|
if (ret) |
|
dev_pm_domain_detach(_dev, true); |
|
} |
|
|
|
out: |
|
if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) { |
|
dev_warn(_dev, "probe deferral not supported\n"); |
|
ret = -ENXIO; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static void platform_remove(struct device *_dev) |
|
{ |
|
struct platform_driver *drv = to_platform_driver(_dev->driver); |
|
struct platform_device *dev = to_platform_device(_dev); |
|
|
|
if (drv->remove) { |
|
int ret = drv->remove(dev); |
|
|
|
if (ret) |
|
dev_warn(_dev, "remove callback returned a non-zero value. This will be ignored.\n"); |
|
} |
|
dev_pm_domain_detach(_dev, true); |
|
} |
|
|
|
static void platform_shutdown(struct device *_dev) |
|
{ |
|
struct platform_device *dev = to_platform_device(_dev); |
|
struct platform_driver *drv; |
|
|
|
if (!_dev->driver) |
|
return; |
|
|
|
drv = to_platform_driver(_dev->driver); |
|
if (drv->shutdown) |
|
drv->shutdown(dev); |
|
} |
|
|
|
|
|
int platform_dma_configure(struct device *dev) |
|
{ |
|
enum dev_dma_attr attr; |
|
int ret = 0; |
|
|
|
if (dev->of_node) { |
|
ret = of_dma_configure(dev, dev->of_node, true); |
|
} else if (has_acpi_companion(dev)) { |
|
attr = acpi_get_dma_attr(to_acpi_device_node(dev->fwnode)); |
|
ret = acpi_dma_configure(dev, attr); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static const struct dev_pm_ops platform_dev_pm_ops = { |
|
.runtime_suspend = pm_generic_runtime_suspend, |
|
.runtime_resume = pm_generic_runtime_resume, |
|
USE_PLATFORM_PM_SLEEP_OPS |
|
}; |
|
|
|
struct bus_type platform_bus_type = { |
|
.name = "platform", |
|
.dev_groups = platform_dev_groups, |
|
.match = platform_match, |
|
.uevent = platform_uevent, |
|
.probe = platform_probe, |
|
.remove = platform_remove, |
|
.shutdown = platform_shutdown, |
|
.dma_configure = platform_dma_configure, |
|
.pm = &platform_dev_pm_ops, |
|
}; |
|
EXPORT_SYMBOL_GPL(platform_bus_type); |
|
|
|
static inline int __platform_match(struct device *dev, const void *drv) |
|
{ |
|
return platform_match(dev, (struct device_driver *)drv); |
|
} |
|
|
|
/** |
|
* platform_find_device_by_driver - Find a platform device with a given |
|
* driver. |
|
* @start: The device to start the search from. |
|
* @drv: The device driver to look for. |
|
*/ |
|
struct device *platform_find_device_by_driver(struct device *start, |
|
const struct device_driver *drv) |
|
{ |
|
return bus_find_device(&platform_bus_type, start, drv, |
|
__platform_match); |
|
} |
|
EXPORT_SYMBOL_GPL(platform_find_device_by_driver); |
|
|
|
void __weak __init early_platform_cleanup(void) { } |
|
|
|
int __init platform_bus_init(void) |
|
{ |
|
int error; |
|
|
|
early_platform_cleanup(); |
|
|
|
error = device_register(&platform_bus); |
|
if (error) { |
|
put_device(&platform_bus); |
|
return error; |
|
} |
|
error = bus_register(&platform_bus_type); |
|
if (error) |
|
device_unregister(&platform_bus); |
|
of_platform_register_reconfig_notifier(); |
|
return error; |
|
}
|
|
|