diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/base/platform.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/base/platform.c | 1167 |
1 files changed, 0 insertions, 1167 deletions
diff --git a/ANDROID_3.4.5/drivers/base/platform.c b/ANDROID_3.4.5/drivers/base/platform.c deleted file mode 100644 index 42069c46..00000000 --- a/ANDROID_3.4.5/drivers/base/platform.c +++ /dev/null @@ -1,1167 +0,0 @@ -/* - * platform.c - platform 'pseudo' bus for legacy devices - * - * Copyright (c) 2002-3 Patrick Mochel - * Copyright (c) 2002-3 Open Source Development Labs - * - * This file is released under the GPLv2 - * - * Please see Documentation/driver-model/platform.txt for more - * information. - */ - -#include <linux/string.h> -#include <linux/platform_device.h> -#include <linux/of_device.h> -#include <linux/module.h> -#include <linux/init.h> -#include <linux/dma-mapping.h> -#include <linux/bootmem.h> -#include <linux/err.h> -#include <linux/slab.h> -#include <linux/pm_runtime.h> - -#include "base.h" - -#define to_platform_driver(drv) (container_of((drv), struct platform_driver, \ - driver)) - -struct device platform_bus = { - .init_name = "platform", -}; -EXPORT_SYMBOL_GPL(platform_bus); - -/** - * arch_setup_pdev_archdata - Allow manipulation of archdata before its used - * @pdev: platform device - * - * This is called before platform_device_add() such that any pdev_archdata may - * be setup before the platform_notifier is called. So if a user needs to - * manipulate any relevant information in the pdev_archdata they can do: - * - * platform_devic_alloc() - * ... manipulate ... - * platform_device_add() - * - * And if they don't care they can just call platform_device_register() and - * everything will just work out. - */ -void __weak arch_setup_pdev_archdata(struct platform_device *pdev) -{ -} - -/** - * platform_get_resource - get a resource for a device - * @dev: platform device - * @type: resource type - * @num: resource index - */ -struct resource *platform_get_resource(struct platform_device *dev, - unsigned int type, unsigned int num) -{ - int 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); - -/** - * platform_get_irq - get an IRQ for a device - * @dev: platform device - * @num: IRQ number index - */ -int platform_get_irq(struct platform_device *dev, unsigned int num) -{ - struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num); - - return r ? r->start : -ENXIO; -} -EXPORT_SYMBOL_GPL(platform_get_irq); - -/** - * 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) -{ - int i; - - for (i = 0; i < dev->num_resources; i++) { - struct resource *r = &dev->resource[i]; - - if (type == resource_type(r) && !strcmp(r->name, name)) - return r; - } - return NULL; -} -EXPORT_SYMBOL_GPL(platform_get_resource_byname); - -/** - * platform_get_irq - get an IRQ for a device - * @dev: platform device - * @name: IRQ name - */ -int platform_get_irq_byname(struct platform_device *dev, const char *name) -{ - struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, - name); - - return r ? r->start : -ENXIO; -} -EXPORT_SYMBOL_GPL(platform_get_irq_byname); - -/** - * 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[1]; -}; - -/** - * 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 (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); -} - -/** - * 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(struct platform_object) + strlen(name), GFP_KERNEL); - if (pa) { - strcpy(pa->name, name); - pa->pdev.name = pa->name; - pa->pdev.id = id; - device_initialize(&pa->pdev.dev); - pa->pdev.dev.release = platform_device_release; - arch_setup_pdev_archdata(&pa->pdev); - } - - return pa ? &pa->pdev : NULL; -} -EXPORT_SYMBOL_GPL(platform_device_alloc); - -/** - * platform_device_add_resources - add resources to a platform device - * @pdev: platform device allocated by platform_device_alloc to add resources to - * @res: set of resources that needs to be allocated for the device - * @num: number of resources - * - * Add a copy of the resources to the platform device. The memory - * associated with the resources will be freed when the platform device is - * released. - */ -int platform_device_add_resources(struct platform_device *pdev, - const struct resource *res, unsigned int num) -{ - struct resource *r = NULL; - - if (res) { - r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL); - if (!r) - return -ENOMEM; - } - - kfree(pdev->resource); - pdev->resource = r; - pdev->num_resources = num; - return 0; -} -EXPORT_SYMBOL_GPL(platform_device_add_resources); - -/** - * platform_device_add_data - add platform-specific data to a platform device - * @pdev: platform device allocated by platform_device_alloc to add resources to - * @data: platform specific data for this platform device - * @size: size of platform specific data - * - * Add a copy of platform specific data to the platform device's - * platform_data pointer. The memory associated with the platform data - * will be freed when the platform device is released. - */ -int platform_device_add_data(struct platform_device *pdev, const void *data, - size_t size) -{ - void *d = NULL; - - if (data) { - d = kmemdup(data, size, GFP_KERNEL); - if (!d) - return -ENOMEM; - } - - kfree(pdev->dev.platform_data); - pdev->dev.platform_data = d; - return 0; -} -EXPORT_SYMBOL_GPL(platform_device_add_data); - -/** - * platform_device_add - add a platform device to device hierarchy - * @pdev: platform device we're adding - * - * This is part 2 of platform_device_register(), though may be called - * separately _iff_ pdev was allocated by platform_device_alloc(). - */ -int platform_device_add(struct platform_device *pdev) -{ - int i, ret = 0; - - if (!pdev) - return -EINVAL; - - if (!pdev->dev.parent) - pdev->dev.parent = &platform_bus; - - pdev->dev.bus = &platform_bus_type; - - if (pdev->id != -1) - dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); - else - dev_set_name(&pdev->dev, "%s", pdev->name); - - 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 && insert_resource(p, r)) { - printk(KERN_ERR - "%s: failed to claim resource %d\n", - dev_name(&pdev->dev), i); - ret = -EBUSY; - 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: - while (--i >= 0) { - struct resource *r = &pdev->resource[i]; - unsigned long type = resource_type(r); - - if (type == IORESOURCE_MEM || type == IORESOURCE_IO) - release_resource(r); - } - - 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) -{ - int i; - - if (pdev) { - device_del(&pdev->dev); - - for (i = 0; i < pdev->num_resources; i++) { - struct resource *r = &pdev->resource[i]; - unsigned long type = resource_type(r); - - if (type == IORESOURCE_MEM || type == IORESOURCE_IO) - 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); - arch_setup_pdev_archdata(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) - goto err_alloc; - - pdev->dev.parent = pdevinfo->parent; - - if (pdevinfo->dma_mask) { - /* - * This memory isn't freed when the device is put, - * I don't have a nice idea for that though. Conceptually - * dma_mask in struct device should not be a pointer. - * See http://thread.gmane.org/gmane.linux.kernel.pci/9081 - */ - pdev->dev.dma_mask = - kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL); - if (!pdev->dev.dma_mask) - goto err; - - *pdev->dev.dma_mask = pdevinfo->dma_mask; - pdev->dev.coherent_dma_mask = pdevinfo->dma_mask; - } - - 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; - - ret = platform_device_add(pdev); - if (ret) { -err: - kfree(pdev->dev.dma_mask); - -err_alloc: - 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); - - return drv->probe(dev); -} - -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); - - return drv->remove(dev); -} - -static void platform_drv_shutdown(struct device *_dev) -{ - struct platform_driver *drv = to_platform_driver(_dev->driver); - struct platform_device *dev = to_platform_device(_dev); - - drv->shutdown(dev); -} - -/** - * platform_driver_register - register a driver for platform-level devices - * @drv: platform driver structure - */ -int platform_driver_register(struct platform_driver *drv) -{ - drv->driver.bus = &platform_bus_type; - if (drv->probe) - drv->driver.probe = platform_drv_probe; - if (drv->remove) - drv->driver.remove = platform_drv_remove; - if (drv->shutdown) - drv->driver.shutdown = platform_drv_shutdown; - - 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 - * - * Use this instead of platform_driver_register() when you know the device - * is not hotpluggable and has already been registered, and you want to - * remove its run-once probe() infrastructure from memory after the driver - * has bound to the device. - * - * One typical use for this would be with drivers for controllers integrated - * into system-on-chip processors, where the controller devices have been - * configured as part of board setup. - * - * Returns zero if the driver registered and bound to a device, else returns - * a negative error code and with the driver not registered. - */ -int __init_or_module platform_driver_probe(struct platform_driver *drv, - int (*probe)(struct platform_device *)) -{ - int retval, code; - - /* 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); - - /* - * 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 - * - * 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 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); - 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); - -/* 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 = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name); - - return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len; -} - -static struct device_attribute platform_dev_attrs[] = { - __ATTR_RO(modalias), - __ATTR_NULL, -}; - -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; - - 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); - - /* Attempt an OF style match first */ - if (of_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){ - printk(KERN_ERR"platform_legacy_suspend %s\n",pdrv->driver.name); - 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){ - printk(KERN_ERR"platform_legacy_resume %s\n",pdrv->driver.name); - 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){ - printk("platform_pm_suspend %s start\n",drv->name); - ret = drv->pm->suspend(dev); - printk("platform_pm_suspend %s end\n",drv->name); - } - } 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){ - printk("platform_pm_resume %s start\n",drv->name); - ret = drv->pm->resume(dev); - printk("platform_pm_resume %s end\n",drv->name); - } - } 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 */ - -static const struct dev_pm_ops platform_dev_pm_ops = { - .runtime_suspend = pm_generic_runtime_suspend, - .runtime_resume = pm_generic_runtime_resume, - .runtime_idle = pm_generic_runtime_idle, - USE_PLATFORM_PM_SLEEP_OPS -}; - -struct bus_type platform_bus_type = { - .name = "platform", - .dev_attrs = platform_dev_attrs, - .match = platform_match, - .uevent = platform_uevent, - .pm = &platform_dev_pm_ops, -}; -EXPORT_SYMBOL_GPL(platform_bus_type); - -int __init platform_bus_init(void) -{ - int error; - - early_platform_cleanup(); - - error = device_register(&platform_bus); - if (error) - return error; - error = bus_register(&platform_bus_type); - if (error) - device_unregister(&platform_bus); - return error; -} - -#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK -u64 dma_get_required_mask(struct device *dev) -{ - u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT); - u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); - u64 mask; - - if (!high_totalram) { - /* convert to mask just covering totalram */ - low_totalram = (1 << (fls(low_totalram) - 1)); - low_totalram += low_totalram - 1; - mask = low_totalram; - } else { - high_totalram = (1 << (fls(high_totalram) - 1)); - high_totalram += high_totalram - 1; - mask = (((u64)high_totalram) << 32) + 0xffffffff; - } - return mask; -} -EXPORT_SYMBOL_GPL(dma_get_required_mask); -#endif - -static __initdata LIST_HEAD(early_platform_driver_list); -static __initdata LIST_HEAD(early_platform_device_list); - -/** - * early_platform_driver_register - register early platform driver - * @epdrv: early_platform driver structure - * @buf: string passed from early_param() - * - * Helper function for early_platform_init() / early_platform_init_buffer() - */ -int __init early_platform_driver_register(struct early_platform_driver *epdrv, - char *buf) -{ - char *tmp; - int n; - - /* Simply add the driver to the end of the global list. - * Drivers will by default be put on the list in compiled-in order. - */ - if (!epdrv->list.next) { - INIT_LIST_HEAD(&epdrv->list); - list_add_tail(&epdrv->list, &early_platform_driver_list); - } - - /* If the user has specified device then make sure the driver - * gets prioritized. The driver of the last device specified on - * command line will be put first on the list. - */ - n = strlen(epdrv->pdrv->driver.name); - if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) { - list_move(&epdrv->list, &early_platform_driver_list); - - /* Allow passing parameters after device name */ - if (buf[n] == '\0' || buf[n] == ',') - epdrv->requested_id = -1; - else { - epdrv->requested_id = simple_strtoul(&buf[n + 1], - &tmp, 10); - - if (buf[n] != '.' || (tmp == &buf[n + 1])) { - epdrv->requested_id = EARLY_PLATFORM_ID_ERROR; - n = 0; - } else - n += strcspn(&buf[n + 1], ",") + 1; - } - - if (buf[n] == ',') - n++; - - if (epdrv->bufsize) { - memcpy(epdrv->buffer, &buf[n], - min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1)); - epdrv->buffer[epdrv->bufsize - 1] = '\0'; - } - } - - return 0; -} - -/** - * early_platform_add_devices - adds a number of early platform devices - * @devs: array of early platform devices to add - * @num: number of early platform devices in array - * - * Used by early architecture code to register early platform devices and - * their platform data. - */ -void __init early_platform_add_devices(struct platform_device **devs, int num) -{ - struct device *dev; - int i; - - /* simply add the devices to list */ - for (i = 0; i < num; i++) { - dev = &devs[i]->dev; - - if (!dev->devres_head.next) { - INIT_LIST_HEAD(&dev->devres_head); - list_add_tail(&dev->devres_head, - &early_platform_device_list); - } - } -} - -/** - * early_platform_driver_register_all - register early platform drivers - * @class_str: string to identify early platform driver class - * - * Used by architecture code to register all early platform drivers - * for a certain class. If omitted then only early platform drivers - * with matching kernel command line class parameters will be registered. - */ -void __init early_platform_driver_register_all(char *class_str) -{ - /* The "class_str" parameter may or may not be present on the kernel - * command line. If it is present then there may be more than one - * matching parameter. - * - * Since we register our early platform drivers using early_param() - * we need to make sure that they also get registered in the case - * when the parameter is missing from the kernel command line. - * - * We use parse_early_options() to make sure the early_param() gets - * called at least once. The early_param() may be called more than - * once since the name of the preferred device may be specified on - * the kernel command line. early_platform_driver_register() handles - * this case for us. - */ - parse_early_options(class_str); -} - -/** - * early_platform_match - find early platform device matching driver - * @epdrv: early platform driver structure - * @id: id to match against - */ -static __init struct platform_device * -early_platform_match(struct early_platform_driver *epdrv, int id) -{ - struct platform_device *pd; - - list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) - if (platform_match(&pd->dev, &epdrv->pdrv->driver)) - if (pd->id == id) - return pd; - - return NULL; -} - -/** - * early_platform_left - check if early platform driver has matching devices - * @epdrv: early platform driver structure - * @id: return true if id or above exists - */ -static __init int early_platform_left(struct early_platform_driver *epdrv, - int id) -{ - struct platform_device *pd; - - list_for_each_entry(pd, &early_platform_device_list, dev.devres_head) - if (platform_match(&pd->dev, &epdrv->pdrv->driver)) - if (pd->id >= id) - return 1; - - return 0; -} - -/** - * early_platform_driver_probe_id - probe drivers matching class_str and id - * @class_str: string to identify early platform driver class - * @id: id to match against - * @nr_probe: number of platform devices to successfully probe before exiting - */ -static int __init early_platform_driver_probe_id(char *class_str, - int id, - int nr_probe) -{ - struct early_platform_driver *epdrv; - struct platform_device *match; - int match_id; - int n = 0; - int left = 0; - - list_for_each_entry(epdrv, &early_platform_driver_list, list) { - /* only use drivers matching our class_str */ - if (strcmp(class_str, epdrv->class_str)) - continue; - - if (id == -2) { - match_id = epdrv->requested_id; - left = 1; - - } else { - match_id = id; - left += early_platform_left(epdrv, id); - - /* skip requested id */ - switch (epdrv->requested_id) { - case EARLY_PLATFORM_ID_ERROR: - case EARLY_PLATFORM_ID_UNSET: - break; - default: - if (epdrv->requested_id == id) - match_id = EARLY_PLATFORM_ID_UNSET; - } - } - - switch (match_id) { - case EARLY_PLATFORM_ID_ERROR: - pr_warning("%s: unable to parse %s parameter\n", - class_str, epdrv->pdrv->driver.name); - /* fall-through */ - case EARLY_PLATFORM_ID_UNSET: - match = NULL; - break; - default: - match = early_platform_match(epdrv, match_id); - } - - if (match) { - /* - * Set up a sensible init_name to enable - * dev_name() and others to be used before the - * rest of the driver core is initialized. - */ - if (!match->dev.init_name && slab_is_available()) { - if (match->id != -1) - match->dev.init_name = - kasprintf(GFP_KERNEL, "%s.%d", - match->name, - match->id); - else - match->dev.init_name = - kasprintf(GFP_KERNEL, "%s", - match->name); - - if (!match->dev.init_name) - return -ENOMEM; - } - - if (epdrv->pdrv->probe(match)) - pr_warning("%s: unable to probe %s early.\n", - class_str, match->name); - else - n++; - } - - if (n >= nr_probe) - break; - } - - if (left) - return n; - else - return -ENODEV; -} - -/** - * early_platform_driver_probe - probe a class of registered drivers - * @class_str: string to identify early platform driver class - * @nr_probe: number of platform devices to successfully probe before exiting - * @user_only: only probe user specified early platform devices - * - * Used by architecture code to probe registered early platform drivers - * within a certain class. For probe to happen a registered early platform - * device matching a registered early platform driver is needed. - */ -int __init early_platform_driver_probe(char *class_str, - int nr_probe, - int user_only) -{ - int k, n, i; - - n = 0; - for (i = -2; n < nr_probe; i++) { - k = early_platform_driver_probe_id(class_str, i, nr_probe - n); - - if (k < 0) - break; - - n += k; - - if (user_only) - break; - } - - return n; -} - -/** - * early_platform_cleanup - clean up early platform code - */ -void __init early_platform_cleanup(void) -{ - struct platform_device *pd, *pd2; - - /* clean up the devres list used to chain devices */ - list_for_each_entry_safe(pd, pd2, &early_platform_device_list, - dev.devres_head) { - list_del(&pd->dev.devres_head); - memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); - } -} - |