mirror of https://gitee.com/openkylin/linux.git
1355 lines
34 KiB
C
1355 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_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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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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* 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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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_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
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* @properties: null terminated array of properties to add
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*
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* The function will take deep copy of @properties and attach the copy to the
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* platform device. The memory associated with properties will be freed when the
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* platform device is released.
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*/
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int platform_device_add_properties(struct platform_device *pdev,
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const struct property_entry *properties)
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{
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return device_add_properties(&pdev->dev, properties);
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}
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EXPORT_SYMBOL_GPL(platform_device_add_properties);
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/**
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* platform_device_add - add a platform device to device hierarchy
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* @pdev: platform device we're adding
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*
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* This is part 2 of platform_device_register(), though may be called
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* separately _iff_ pdev was allocated by platform_device_alloc().
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*/
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int platform_device_add(struct platform_device *pdev)
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{
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u32 i;
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int ret;
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if (!pdev)
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return -EINVAL;
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|
|
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;
|
|
}
|