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![Christoph Hellwig](/assets/img/avatar_default.png)
This does three inter-related things to clarify the usage of the platform device dma_mask field. In the process, fix the bug introduced bycdfee56232
("driver core: initialize a default DMA mask for platform device") that caused Artem Tashkinov's laptop to not boot with newer Fedora kernels. This does: - First off, rename the field to "platform_dma_mask" to make it greppable. We have way too many different random fields called "dma_mask" in various data structures, where some of them are actual masks, and some of them are just pointers to the mask. And the structures all have pointers to each other, or embed each other inside themselves, and "pdev" sometimes means "platform device" and sometimes it means "PCI device". So to make it clear in the code when you actually use this new field, give it a unique name (it really should be something even more unique like "platform_device_dma_mask", since it's per platform device, not per platform, but that gets old really fast, and this is unique enough in context). To further clarify when the field gets used, initialize it when we actually start using it with the default value. - Then, use this field instead of the random one-off allocation in platform_device_register_full() that is now unnecessary since we now already have a perfectly fine allocation for it in the platform device structure. - The above then allows us to fix the actual bug, where the error path of platform_device_register_full() would unconditionally free the platform device DMA allocation with 'kfree()'. That kfree() was dont regardless of whether the allocation had been done earlier with the (now removed) kmalloc, or whether setup_pdev_dma_masks() had already been used and the dma_mask pointer pointed to the mask that was part of the platform device. It seems most people never triggered the error path, or only triggered it from a call chain that set an explicit pdevinfo->dma_mask value (and thus caused the unnecessary allocation that was "cleaned up" in the error path) before calling platform_device_register_full(). Robin Murphy points out that in Artem's case the wdat_wdt driver failed in platform_device_add(), and that was the one that had called platform_device_register_full() with pdevinfo.dma_mask = 0, and would have caused that kfree() of pdev.dma_mask corrupting the heap. A later unrelated kmalloc() then oopsed due to the heap corruption. Fixes:cdfee56232
("driver core: initialize a default DMA mask for platform device") Reported-bisected-and-tested-by: Artem S. Tashkinov <aros@gmx.com> Reviewed-by: Robin Murphy <robin.murphy@arm.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1335 lines
34 KiB
C
1335 lines
34 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* platform.c - platform 'pseudo' bus for legacy devices
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*
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* 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
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* information.
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*/
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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/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/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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#include "base.h"
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#include "power/power.h"
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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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struct resource *platform_get_resource(struct platform_device *dev,
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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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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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#ifdef CONFIG_HAS_IOMEM
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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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void __iomem *devm_platform_ioremap_resource(struct platform_device *pdev,
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unsigned int index)
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{
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struct resource *res;
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res = platform_get_resource(pdev, IORESOURCE_MEM, index);
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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);
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/**
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* devm_platform_ioremap_resource_wc - write-combined variant of
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* devm_platform_ioremap_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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*/
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void __iomem *devm_platform_ioremap_resource_wc(struct platform_device *pdev,
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unsigned int index)
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{
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struct resource *res;
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res = platform_get_resource(pdev, IORESOURCE_MEM, index);
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return devm_ioremap_resource_wc(&pdev->dev, res);
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}
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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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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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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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* 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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* Example:
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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: 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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#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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return -ENXIO;
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return dev->archdata.irqs[num];
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#else
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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(dev->dev.of_node, num);
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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(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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return ret;
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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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return -ENXIO;
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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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return r->start;
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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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return ret;
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}
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return -ENXIO;
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#endif
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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
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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 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
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* not pass a negative integer value to the request_irq() APIs.
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*
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* Example:
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* int irq = platform_get_irq(pdev, 0);
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* if (irq < 0)
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* return irq;
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*
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* Return: IRQ number on success, negative error number on failure.
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*/
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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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return ret;
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}
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EXPORT_SYMBOL_GPL(platform_get_irq);
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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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if (ret == -EPROBE_DEFER)
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return ret;
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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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* 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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return r->start;
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return -ENXIO;
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}
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/**
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* platform_get_irq_byname - get an IRQ for a device by name
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* @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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*
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* Return: 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
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* @dev: platform device
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* @name: IRQ name
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*
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* Get an optional IRQ by name like platform_get_irq_byname(). 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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* Return: IRQ number on success, negative error number on failure.
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*/
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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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{
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return __platform_get_irq_byname(dev, name);
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}
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EXPORT_SYMBOL_GPL(platform_get_irq_byname_optional);
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/**
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* platform_add_devices - add a numbers of platform devices
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* @devs: array of platform devices to add
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* @num: number of platform devices in array
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*/
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int platform_add_devices(struct platform_device **devs, int num)
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{
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int i, ret = 0;
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for (i = 0; i < num; i++) {
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ret = platform_device_register(devs[i]);
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if (ret) {
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while (--i >= 0)
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platform_device_unregister(devs[i]);
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break;
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}
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(platform_add_devices);
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struct platform_object {
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struct platform_device pdev;
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char name[];
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};
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/*
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* Set up default DMA mask for platform devices if the they weren't
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* previously set by the architecture / DT.
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*/
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static void setup_pdev_dma_masks(struct platform_device *pdev)
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{
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if (!pdev->dev.coherent_dma_mask)
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pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
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if (!pdev->dev.dma_mask) {
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pdev->platform_dma_mask = DMA_BIT_MASK(32);
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pdev->dev.dma_mask = &pdev->platform_dma_mask;
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}
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};
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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
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* _only_ be externally called in error cases. All other usage is a bug.
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*/
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void platform_device_put(struct platform_device *pdev)
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{
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if (!IS_ERR_OR_NULL(pdev))
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put_device(&pdev->dev);
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}
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EXPORT_SYMBOL_GPL(platform_device_put);
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static void platform_device_release(struct device *dev)
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{
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struct platform_object *pa = container_of(dev, struct platform_object,
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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);
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kfree(pa->pdev.driver_override);
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kfree(pa);
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}
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/**
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* platform_device_alloc - create a platform device
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* @name: base name of the device we're adding
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* @id: instance id
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*
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* Create a platform device object which can have other objects attached
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* to it, and which will have attached objects freed when it is released.
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*/
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struct platform_device *platform_device_alloc(const char *name, int id)
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{
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struct platform_object *pa;
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pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL);
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if (pa) {
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strcpy(pa->name, name);
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pa->pdev.name = pa->name;
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pa->pdev.id = id;
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device_initialize(&pa->pdev.dev);
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pa->pdev.dev.release = platform_device_release;
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setup_pdev_dma_masks(&pa->pdev);
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}
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return pa ? &pa->pdev : NULL;
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}
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EXPORT_SYMBOL_GPL(platform_device_alloc);
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/**
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* platform_device_add_resources - add resources to a platform device
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* @pdev: platform device allocated by platform_device_alloc to add resources to
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* @res: set of resources that needs to be allocated for the device
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* @num: number of resources
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*
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* Add a copy of the resources to the platform device. The memory
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* associated with the resources will be freed when the platform device is
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* 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) {
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r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
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if (!r)
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return -ENOMEM;
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}
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kfree(pdev->resource);
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pdev->resource = r;
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pdev->num_resources = num;
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return 0;
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}
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EXPORT_SYMBOL_GPL(platform_device_add_resources);
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/**
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* platform_device_add_data - add platform-specific data to a platform device
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* @pdev: platform device allocated by platform_device_alloc to add resources to
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* @data: platform specific data for this platform device
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* @size: size of platform specific data
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*
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* Add a copy of platform specific data to the platform device's
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* platform_data pointer. The memory associated with the platform data
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* 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,
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size_t size)
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{
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void *d = NULL;
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if (data) {
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d = kmemdup(data, size, GFP_KERNEL);
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if (!d)
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return -ENOMEM;
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}
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kfree(pdev->dev.platform_data);
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pdev->dev.platform_data = d;
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return 0;
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}
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EXPORT_SYMBOL_GPL(platform_device_add_data);
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/**
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* platform_device_add_properties - add built-in properties to a platform device
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* @pdev: platform device to add properties to
|
|
* @properties: null terminated array of properties to add
|
|
*
|
|
* The function will take deep copy of @properties and attach the copy to the
|
|
* platform device. The memory associated with properties will be freed when the
|
|
* platform device is released.
|
|
*/
|
|
int platform_device_add_properties(struct platform_device *pdev,
|
|
const struct property_entry *properties)
|
|
{
|
|
return device_add_properties(&pdev->dev, properties);
|
|
}
|
|
EXPORT_SYMBOL_GPL(platform_device_add_properties);
|
|
|
|
/**
|
|
* 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_simple_get(&platform_devid_ida, 0, 0, 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_simple_remove(&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_simple_remove(&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 = -ENOMEM;
|
|
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 = platform_device_add_properties(pdev,
|
|
pdevinfo->properties);
|
|
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);
|
|
|
|
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);
|
|
int ret;
|
|
|
|
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 int platform_drv_probe_fail(struct device *_dev)
|
|
{
|
|
return -ENXIO;
|
|
}
|
|
|
|
static int platform_drv_remove(struct device *_dev)
|
|
{
|
|
struct platform_driver *drv = to_platform_driver(_dev->driver);
|
|
struct platform_device *dev = to_platform_device(_dev);
|
|
int ret = 0;
|
|
|
|
if (drv->remove)
|
|
ret = drv->remove(dev);
|
|
dev_pm_domain_detach(_dev, true);
|
|
|
|
return ret;
|
|
}
|
|
|
|
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);
|
|
|
|
if (drv->shutdown)
|
|
drv->shutdown(dev);
|
|
}
|
|
|
|
/**
|
|
* __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;
|
|
drv->driver.probe = platform_drv_probe;
|
|
drv->driver.remove = platform_drv_remove;
|
|
drv->driver.shutdown = platform_drv_shutdown;
|
|
|
|
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);
|
|
|
|
/**
|
|
* __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);
|
|
|
|
/*
|
|
* 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 = NULL;
|
|
if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
|
|
retval = -ENODEV;
|
|
drv->driver.probe = platform_drv_probe_fail;
|
|
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
|
|
*
|
|
* Unegisters 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);
|
|
|
|
/* modalias support enables more hands-off userspace setup:
|
|
* (a) environment variable lets new-style hotplug events work once system is
|
|
* fully running: "modprobe $MODALIAS"
|
|
* (b) sysfs attribute lets new-style coldplug recover from hotplug events
|
|
* mishandled before system is fully running: "modprobe $(cat modalias)"
|
|
*/
|
|
static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
int len;
|
|
|
|
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;
|
|
|
|
len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
|
|
|
|
return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
|
|
}
|
|
static DEVICE_ATTR_RO(modalias);
|
|
|
|
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 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 = sprintf(buf, "%s\n", pdev->driver_override);
|
|
device_unlock(dev);
|
|
return len;
|
|
}
|
|
static DEVICE_ATTR_RW(driver_override);
|
|
|
|
|
|
static struct attribute *platform_dev_attrs[] = {
|
|
&dev_attr_modalias.attr,
|
|
&dev_attr_driver_override.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(platform_dev);
|
|
|
|
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 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;
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
#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 */
|
|
|
|
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,
|
|
.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;
|
|
}
|