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- // SPDX-License-Identifier: GPL-2.0
- /*
- * platform.c - platform 'pseudo' bus for legacy devices
- *
- * Copyright (c) 2002-3 Patrick Mochel
- * Copyright (c) 2002-3 Open Source Development Labs
- *
- * Please see Documentation/driver-api/driver-model/platform.rst for more
- * information.
- */
- #include <linux/string.h>
- #include <linux/platform_device.h>
- #include <linux/of_device.h>
- #include <linux/of_irq.h>
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/dma-mapping.h>
- #include <linux/memblock.h>
- #include <linux/err.h>
- #include <linux/slab.h>
- #include <linux/pm_runtime.h>
- #include <linux/pm_domain.h>
- #include <linux/idr.h>
- #include <linux/acpi.h>
- #include <linux/clk/clk-conf.h>
- #include <linux/limits.h>
- #include <linux/property.h>
- #include <linux/kmemleak.h>
- #include <linux/types.h>
- #include "base.h"
- #include "power/power.h"
- /* For automatically allocated device IDs */
- static DEFINE_IDA(platform_devid_ida);
- struct device platform_bus = {
- .init_name = "platform",
- };
- EXPORT_SYMBOL_GPL(platform_bus);
- /**
- * platform_get_resource - get a resource for a device
- * @dev: platform device
- * @type: resource type
- * @num: resource index
- *
- * Return: a pointer to the resource or NULL on failure.
- */
- struct resource *platform_get_resource(struct platform_device *dev,
- unsigned int type, unsigned int num)
- {
- u32 i;
- for (i = 0; i < dev->num_resources; i++) {
- struct resource *r = &dev->resource[i];
- if (type == resource_type(r) && num-- == 0)
- return r;
- }
- return NULL;
- }
- EXPORT_SYMBOL_GPL(platform_get_resource);
- #ifdef CONFIG_HAS_IOMEM
- /**
- * devm_platform_get_and_ioremap_resource - call devm_ioremap_resource() for a
- * platform device and get resource
- *
- * @pdev: platform device to use both for memory resource lookup as well as
- * resource management
- * @index: resource index
- * @res: optional output parameter to store a pointer to the obtained resource.
- *
- * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code
- * on failure.
- */
- void __iomem *
- devm_platform_get_and_ioremap_resource(struct platform_device *pdev,
- unsigned int index, struct resource **res)
- {
- struct resource *r;
- r = platform_get_resource(pdev, IORESOURCE_MEM, index);
- if (res)
- *res = r;
- return devm_ioremap_resource(&pdev->dev, r);
- }
- EXPORT_SYMBOL_GPL(devm_platform_get_and_ioremap_resource);
- /**
- * devm_platform_ioremap_resource - call devm_ioremap_resource() for a platform
- * device
- *
- * @pdev: platform device to use both for memory resource lookup as well as
- * resource management
- * @index: resource index
- *
- * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code
- * on failure.
- */
- void __iomem *devm_platform_ioremap_resource(struct platform_device *pdev,
- unsigned int index)
- {
- return devm_platform_get_and_ioremap_resource(pdev, index, NULL);
- }
- EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource);
- /**
- * devm_platform_ioremap_resource_wc - write-combined variant of
- * devm_platform_ioremap_resource()
- *
- * @pdev: platform device to use both for memory resource lookup as well as
- * resource management
- * @index: resource index
- *
- * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code
- * on failure.
- */
- void __iomem *devm_platform_ioremap_resource_wc(struct platform_device *pdev,
- unsigned int index)
- {
- struct resource *res;
- res = platform_get_resource(pdev, IORESOURCE_MEM, index);
- return devm_ioremap_resource_wc(&pdev->dev, res);
- }
- /**
- * devm_platform_ioremap_resource_byname - call devm_ioremap_resource for
- * a platform device, retrieve the
- * resource by name
- *
- * @pdev: platform device to use both for memory resource lookup as well as
- * resource management
- * @name: name of the resource
- *
- * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code
- * on failure.
- */
- void __iomem *
- devm_platform_ioremap_resource_byname(struct platform_device *pdev,
- const char *name)
- {
- struct resource *res;
- res = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
- return devm_ioremap_resource(&pdev->dev, res);
- }
- EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource_byname);
- #endif /* CONFIG_HAS_IOMEM */
- /**
- * platform_get_irq_optional - get an optional IRQ for a device
- * @dev: platform device
- * @num: IRQ number index
- *
- * Gets an IRQ for a platform device. Device drivers should check the return
- * value for errors so as to not pass a negative integer value to the
- * request_irq() APIs. This is the same as platform_get_irq(), except that it
- * does not print an error message if an IRQ can not be obtained.
- *
- * For example::
- *
- * int irq = platform_get_irq_optional(pdev, 0);
- * if (irq < 0)
- * return irq;
- *
- * Return: non-zero IRQ number on success, negative error number on failure.
- */
- int platform_get_irq_optional(struct platform_device *dev, unsigned int num)
- {
- int ret;
- #ifdef CONFIG_SPARC
- /* sparc does not have irqs represented as IORESOURCE_IRQ resources */
- if (!dev || num >= dev->archdata.num_irqs)
- return -ENXIO;
- ret = dev->archdata.irqs[num];
- goto out;
- #else
- struct resource *r;
- if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
- ret = of_irq_get(dev->dev.of_node, num);
- if (ret > 0 || ret == -EPROBE_DEFER)
- goto out;
- }
- r = platform_get_resource(dev, IORESOURCE_IRQ, num);
- if (has_acpi_companion(&dev->dev)) {
- if (r && r->flags & IORESOURCE_DISABLED) {
- ret = acpi_irq_get(ACPI_HANDLE(&dev->dev), num, r);
- if (ret)
- goto out;
- }
- }
- /*
- * The resources may pass trigger flags to the irqs that need
- * to be set up. It so happens that the trigger flags for
- * IORESOURCE_BITS correspond 1-to-1 to the IRQF_TRIGGER*
- * settings.
- */
- if (r && r->flags & IORESOURCE_BITS) {
- struct irq_data *irqd;
- irqd = irq_get_irq_data(r->start);
- if (!irqd) {
- ret = -ENXIO;
- goto out;
- }
- irqd_set_trigger_type(irqd, r->flags & IORESOURCE_BITS);
- }
- if (r) {
- ret = r->start;
- goto out;
- }
- /*
- * For the index 0 interrupt, allow falling back to GpioInt
- * resources. While a device could have both Interrupt and GpioInt
- * resources, making this fallback ambiguous, in many common cases
- * the device will only expose one IRQ, and this fallback
- * allows a common code path across either kind of resource.
- */
- if (num == 0 && has_acpi_companion(&dev->dev)) {
- ret = acpi_dev_gpio_irq_get(ACPI_COMPANION(&dev->dev), num);
- /* Our callers expect -ENXIO for missing IRQs. */
- if (ret >= 0 || ret == -EPROBE_DEFER)
- goto out;
- }
- ret = -ENXIO;
- #endif
- out:
- WARN(ret == 0, "0 is an invalid IRQ number\n");
- return ret;
- }
- EXPORT_SYMBOL_GPL(platform_get_irq_optional);
- /**
- * platform_get_irq - get an IRQ for a device
- * @dev: platform device
- * @num: IRQ number index
- *
- * Gets an IRQ for a platform device and prints an error message if finding the
- * IRQ fails. Device drivers should check the return value for errors so as to
- * not pass a negative integer value to the request_irq() APIs.
- *
- * For example::
- *
- * int irq = platform_get_irq(pdev, 0);
- * if (irq < 0)
- * return irq;
- *
- * Return: non-zero IRQ number on success, negative error number on failure.
- */
- int platform_get_irq(struct platform_device *dev, unsigned int num)
- {
- int ret;
- ret = platform_get_irq_optional(dev, num);
- if (ret < 0 && ret != -EPROBE_DEFER)
- dev_err(&dev->dev, "IRQ index %u not found\n", num);
- return ret;
- }
- EXPORT_SYMBOL_GPL(platform_get_irq);
- /**
- * platform_irq_count - Count the number of IRQs a platform device uses
- * @dev: platform device
- *
- * Return: Number of IRQs a platform device uses or EPROBE_DEFER
- */
- int platform_irq_count(struct platform_device *dev)
- {
- int ret, nr = 0;
- while ((ret = platform_get_irq_optional(dev, nr)) >= 0)
- nr++;
- if (ret == -EPROBE_DEFER)
- return ret;
- return nr;
- }
- EXPORT_SYMBOL_GPL(platform_irq_count);
- /**
- * platform_get_resource_byname - get a resource for a device by name
- * @dev: platform device
- * @type: resource type
- * @name: resource name
- */
- struct resource *platform_get_resource_byname(struct platform_device *dev,
- unsigned int type,
- const char *name)
- {
- u32 i;
- for (i = 0; i < dev->num_resources; i++) {
- struct resource *r = &dev->resource[i];
- if (unlikely(!r->name))
- continue;
- if (type == resource_type(r) && !strcmp(r->name, name))
- return r;
- }
- return NULL;
- }
- EXPORT_SYMBOL_GPL(platform_get_resource_byname);
- static int __platform_get_irq_byname(struct platform_device *dev,
- const char *name)
- {
- struct resource *r;
- int ret;
- if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
- ret = of_irq_get_byname(dev->dev.of_node, name);
- if (ret > 0 || ret == -EPROBE_DEFER)
- return ret;
- }
- r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);
- if (r) {
- WARN(r->start == 0, "0 is an invalid IRQ number\n");
- return r->start;
- }
- return -ENXIO;
- }
- /**
- * platform_get_irq_byname - get an IRQ for a device by name
- * @dev: platform device
- * @name: IRQ name
- *
- * Get an IRQ like platform_get_irq(), but then by name rather then by index.
- *
- * Return: non-zero IRQ number on success, negative error number on failure.
- */
- int platform_get_irq_byname(struct platform_device *dev, const char *name)
- {
- int ret;
- ret = __platform_get_irq_byname(dev, name);
- if (ret < 0 && ret != -EPROBE_DEFER)
- dev_err(&dev->dev, "IRQ %s not found\n", name);
- return ret;
- }
- EXPORT_SYMBOL_GPL(platform_get_irq_byname);
- /**
- * platform_get_irq_byname_optional - get an optional IRQ for a device by name
- * @dev: platform device
- * @name: IRQ name
- *
- * Get an optional IRQ by name like platform_get_irq_byname(). Except that it
- * does not print an error message if an IRQ can not be obtained.
- *
- * Return: non-zero IRQ number on success, negative error number on failure.
- */
- int platform_get_irq_byname_optional(struct platform_device *dev,
- const char *name)
- {
- return __platform_get_irq_byname(dev, name);
- }
- EXPORT_SYMBOL_GPL(platform_get_irq_byname_optional);
- /**
- * platform_add_devices - add a numbers of platform devices
- * @devs: array of platform devices to add
- * @num: number of platform devices in array
- */
- int platform_add_devices(struct platform_device **devs, int num)
- {
- int i, ret = 0;
- for (i = 0; i < num; i++) {
- ret = platform_device_register(devs[i]);
- if (ret) {
- while (--i >= 0)
- platform_device_unregister(devs[i]);
- break;
- }
- }
- return ret;
- }
- EXPORT_SYMBOL_GPL(platform_add_devices);
- struct platform_object {
- struct platform_device pdev;
- char name[];
- };
- /*
- * Set up default DMA mask for platform devices if the they weren't
- * previously set by the architecture / DT.
- */
- static void setup_pdev_dma_masks(struct platform_device *pdev)
- {
- pdev->dev.dma_parms = &pdev->dma_parms;
- if (!pdev->dev.coherent_dma_mask)
- pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
- if (!pdev->dev.dma_mask) {
- pdev->platform_dma_mask = DMA_BIT_MASK(32);
- pdev->dev.dma_mask = &pdev->platform_dma_mask;
- }
- };
- /**
- * platform_device_put - destroy a platform device
- * @pdev: platform device to free
- *
- * Free all memory associated with a platform device. This function must
- * _only_ be externally called in error cases. All other usage is a bug.
- */
- void platform_device_put(struct platform_device *pdev)
- {
- if (!IS_ERR_OR_NULL(pdev))
- put_device(&pdev->dev);
- }
- EXPORT_SYMBOL_GPL(platform_device_put);
- static void platform_device_release(struct device *dev)
- {
- struct platform_object *pa = container_of(dev, struct platform_object,
- pdev.dev);
- of_device_node_put(&pa->pdev.dev);
- kfree(pa->pdev.dev.platform_data);
- kfree(pa->pdev.mfd_cell);
- kfree(pa->pdev.resource);
- kfree(pa->pdev.driver_override);
- kfree(pa);
- }
- /**
- * platform_device_alloc - create a platform device
- * @name: base name of the device we're adding
- * @id: instance id
- *
- * Create a platform device object which can have other objects attached
- * to it, and which will have attached objects freed when it is released.
- */
- struct platform_device *platform_device_alloc(const char *name, int id)
- {
- struct platform_object *pa;
- pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL);
- if (pa) {
- strcpy(pa->name, name);
- pa->pdev.name = pa->name;
- pa->pdev.id = id;
- device_initialize(&pa->pdev.dev);
- pa->pdev.dev.release = platform_device_release;
- setup_pdev_dma_masks(&pa->pdev);
- }
- return pa ? &pa->pdev : NULL;
- }
- EXPORT_SYMBOL_GPL(platform_device_alloc);
- /**
- * platform_device_add_resources - add resources to a platform device
- * @pdev: platform device allocated by platform_device_alloc to add resources to
- * @res: set of resources that needs to be allocated for the device
- * @num: number of resources
- *
- * Add a copy of the resources to the platform device. The memory
- * associated with the resources will be freed when the platform device is
- * released.
- */
- int platform_device_add_resources(struct platform_device *pdev,
- const struct resource *res, unsigned int num)
- {
- struct resource *r = NULL;
- if (res) {
- r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
- if (!r)
- return -ENOMEM;
- }
- kfree(pdev->resource);
- pdev->resource = r;
- pdev->num_resources = num;
- return 0;
- }
- EXPORT_SYMBOL_GPL(platform_device_add_resources);
- /**
- * platform_device_add_data - add platform-specific data to a platform device
- * @pdev: platform device allocated by platform_device_alloc to add resources to
- * @data: platform specific data for this platform device
- * @size: size of platform specific data
- *
- * Add a copy of platform specific data to the platform device's
- * platform_data pointer. The memory associated with the platform data
- * will be freed when the platform device is released.
- */
- int platform_device_add_data(struct platform_device *pdev, const void *data,
- size_t size)
- {
- void *d = NULL;
- if (data) {
- d = kmemdup(data, size, GFP_KERNEL);
- if (!d)
- return -ENOMEM;
- }
- kfree(pdev->dev.platform_data);
- pdev->dev.platform_data = d;
- return 0;
- }
- EXPORT_SYMBOL_GPL(platform_device_add_data);
- /**
- * platform_device_add_properties - add built-in properties to a platform device
- * @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_alloc(&platform_devid_ida, GFP_KERNEL);
- if (ret < 0)
- goto err_out;
- pdev->id = ret;
- pdev->id_auto = true;
- dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id);
- break;
- }
- for (i = 0; i < pdev->num_resources; i++) {
- struct resource *p, *r = &pdev->resource[i];
- if (r->name == NULL)
- r->name = dev_name(&pdev->dev);
- p = r->parent;
- if (!p) {
- if (resource_type(r) == IORESOURCE_MEM)
- p = &iomem_resource;
- else if (resource_type(r) == IORESOURCE_IO)
- p = &ioport_resource;
- }
- if (p) {
- ret = insert_resource(p, r);
- if (ret) {
- dev_err(&pdev->dev, "failed to claim resource %d: %pR\n", i, r);
- goto failed;
- }
- }
- }
- pr_debug("Registering platform device '%s'. Parent at %s\n",
- dev_name(&pdev->dev), dev_name(pdev->dev.parent));
- ret = device_add(&pdev->dev);
- if (ret == 0)
- return ret;
- failed:
- if (pdev->id_auto) {
- ida_free(&platform_devid_ida, pdev->id);
- pdev->id = PLATFORM_DEVID_AUTO;
- }
- while (i--) {
- struct resource *r = &pdev->resource[i];
- if (r->parent)
- release_resource(r);
- }
- err_out:
- return ret;
- }
- EXPORT_SYMBOL_GPL(platform_device_add);
- /**
- * platform_device_del - remove a platform-level device
- * @pdev: platform device we're removing
- *
- * Note that this function will also release all memory- and port-based
- * resources owned by the device (@dev->resource). This function must
- * _only_ be externally called in error cases. All other usage is a bug.
- */
- void platform_device_del(struct platform_device *pdev)
- {
- u32 i;
- if (!IS_ERR_OR_NULL(pdev)) {
- device_del(&pdev->dev);
- if (pdev->id_auto) {
- ida_free(&platform_devid_ida, pdev->id);
- pdev->id = PLATFORM_DEVID_AUTO;
- }
- for (i = 0; i < pdev->num_resources; i++) {
- struct resource *r = &pdev->resource[i];
- if (r->parent)
- release_resource(r);
- }
- }
- }
- EXPORT_SYMBOL_GPL(platform_device_del);
- /**
- * platform_device_register - add a platform-level device
- * @pdev: platform device we're adding
- */
- int platform_device_register(struct platform_device *pdev)
- {
- device_initialize(&pdev->dev);
- setup_pdev_dma_masks(pdev);
- return platform_device_add(pdev);
- }
- EXPORT_SYMBOL_GPL(platform_device_register);
- /**
- * platform_device_unregister - unregister a platform-level device
- * @pdev: platform device we're unregistering
- *
- * Unregistration is done in 2 steps. First we release all resources
- * and remove it from the subsystem, then we drop reference count by
- * calling platform_device_put().
- */
- void platform_device_unregister(struct platform_device *pdev)
- {
- platform_device_del(pdev);
- platform_device_put(pdev);
- }
- EXPORT_SYMBOL_GPL(platform_device_unregister);
- /**
- * platform_device_register_full - add a platform-level device with
- * resources and platform-specific data
- *
- * @pdevinfo: data used to create device
- *
- * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
- */
- struct platform_device *platform_device_register_full(
- const struct platform_device_info *pdevinfo)
- {
- int ret;
- struct platform_device *pdev;
- pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id);
- if (!pdev)
- return ERR_PTR(-ENOMEM);
- pdev->dev.parent = pdevinfo->parent;
- pdev->dev.fwnode = pdevinfo->fwnode;
- pdev->dev.of_node = of_node_get(to_of_node(pdev->dev.fwnode));
- pdev->dev.of_node_reused = pdevinfo->of_node_reused;
- if (pdevinfo->dma_mask) {
- pdev->platform_dma_mask = pdevinfo->dma_mask;
- pdev->dev.dma_mask = &pdev->platform_dma_mask;
- pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
- }
- ret = platform_device_add_resources(pdev,
- pdevinfo->res, pdevinfo->num_res);
- if (ret)
- goto err;
- ret = platform_device_add_data(pdev,
- pdevinfo->data, pdevinfo->size_data);
- if (ret)
- goto err;
- if (pdevinfo->properties) {
- ret = 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);
- if (retval)
- return retval;
- /*
- * Fixup that section violation, being paranoid about code scanning
- * the list of drivers in order to probe new devices. Check to see
- * if the probe was successful, and make sure any forced probes of
- * new devices fail.
- */
- spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
- drv->probe = 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
- *
- * Unregisters platform drivers specified by an array. This is typically used
- * to complement an earlier call to platform_register_drivers(). Drivers are
- * unregistered in the reverse order in which they were registered.
- */
- void platform_unregister_drivers(struct platform_driver * const *drivers,
- unsigned int count)
- {
- while (count--) {
- pr_debug("unregistering platform driver %ps\n", drivers[count]);
- platform_driver_unregister(drivers[count]);
- }
- }
- EXPORT_SYMBOL_GPL(platform_unregister_drivers);
- /* modalias support enables more hands-off userspace setup:
- * (a) environment variable lets new-style hotplug events work once system is
- * fully running: "modprobe $MODALIAS"
- * (b) sysfs attribute lets new-style coldplug recover from hotplug events
- * mishandled before system is fully running: "modprobe $(cat modalias)"
- */
- static ssize_t modalias_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct platform_device *pdev = to_platform_device(dev);
- int len;
- len = of_device_modalias(dev, buf, PAGE_SIZE);
- if (len != -ENODEV)
- return len;
- len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1);
- if (len != -ENODEV)
- return len;
- return sysfs_emit(buf, "platform:%s\n", pdev->name);
- }
- static DEVICE_ATTR_RO(modalias);
- static ssize_t 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 = sysfs_emit(buf, "%s\n", pdev->driver_override);
- device_unlock(dev);
- return len;
- }
- static DEVICE_ATTR_RW(driver_override);
- static ssize_t numa_node_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- return sysfs_emit(buf, "%d\n", dev_to_node(dev));
- }
- static DEVICE_ATTR_RO(numa_node);
- static umode_t platform_dev_attrs_visible(struct kobject *kobj, struct attribute *a,
- int n)
- {
- struct device *dev = container_of(kobj, typeof(*dev), kobj);
- if (a == &dev_attr_numa_node.attr &&
- dev_to_node(dev) == NUMA_NO_NODE)
- return 0;
- return a->mode;
- }
- static struct attribute *platform_dev_attrs[] = {
- &dev_attr_modalias.attr,
- &dev_attr_numa_node.attr,
- &dev_attr_driver_override.attr,
- NULL,
- };
- static struct attribute_group platform_dev_group = {
- .attrs = platform_dev_attrs,
- .is_visible = platform_dev_attrs_visible,
- };
- __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;
- }
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