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520 lines
11 KiB
520 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* MEN Chameleon Bus. |
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* |
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* Copyright (C) 2013 MEN Mikroelektronik GmbH (www.men.de) |
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* Author: Johannes Thumshirn <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/types.h> |
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#include <linux/idr.h> |
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#include <linux/mcb.h> |
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static DEFINE_IDA(mcb_ida); |
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static const struct mcb_device_id *mcb_match_id(const struct mcb_device_id *ids, |
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struct mcb_device *dev) |
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{ |
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if (ids) { |
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while (ids->device) { |
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if (ids->device == dev->id) |
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return ids; |
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ids++; |
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} |
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} |
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return NULL; |
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} |
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static int mcb_match(struct device *dev, struct device_driver *drv) |
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{ |
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struct mcb_driver *mdrv = to_mcb_driver(drv); |
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struct mcb_device *mdev = to_mcb_device(dev); |
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const struct mcb_device_id *found_id; |
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found_id = mcb_match_id(mdrv->id_table, mdev); |
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if (found_id) |
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return 1; |
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return 0; |
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} |
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static int mcb_uevent(struct device *dev, struct kobj_uevent_env *env) |
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{ |
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struct mcb_device *mdev = to_mcb_device(dev); |
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int ret; |
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ret = add_uevent_var(env, "MODALIAS=mcb:16z%03d", mdev->id); |
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if (ret) |
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return -ENOMEM; |
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return 0; |
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} |
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static int mcb_probe(struct device *dev) |
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{ |
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struct mcb_driver *mdrv = to_mcb_driver(dev->driver); |
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struct mcb_device *mdev = to_mcb_device(dev); |
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const struct mcb_device_id *found_id; |
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struct module *carrier_mod; |
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int ret; |
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found_id = mcb_match_id(mdrv->id_table, mdev); |
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if (!found_id) |
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return -ENODEV; |
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carrier_mod = mdev->dev.parent->driver->owner; |
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if (!try_module_get(carrier_mod)) |
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return -EINVAL; |
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get_device(dev); |
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ret = mdrv->probe(mdev, found_id); |
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if (ret) |
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module_put(carrier_mod); |
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return ret; |
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} |
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static int mcb_remove(struct device *dev) |
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{ |
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struct mcb_driver *mdrv = to_mcb_driver(dev->driver); |
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struct mcb_device *mdev = to_mcb_device(dev); |
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struct module *carrier_mod; |
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mdrv->remove(mdev); |
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carrier_mod = mdev->dev.parent->driver->owner; |
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module_put(carrier_mod); |
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put_device(&mdev->dev); |
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return 0; |
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} |
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static void mcb_shutdown(struct device *dev) |
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{ |
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struct mcb_driver *mdrv = to_mcb_driver(dev->driver); |
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struct mcb_device *mdev = to_mcb_device(dev); |
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if (mdrv && mdrv->shutdown) |
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mdrv->shutdown(mdev); |
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} |
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static ssize_t revision_show(struct device *dev, struct device_attribute *attr, |
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char *buf) |
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{ |
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struct mcb_bus *bus = to_mcb_bus(dev); |
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return scnprintf(buf, PAGE_SIZE, "%d\n", bus->revision); |
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} |
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static DEVICE_ATTR_RO(revision); |
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static ssize_t model_show(struct device *dev, struct device_attribute *attr, |
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char *buf) |
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{ |
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struct mcb_bus *bus = to_mcb_bus(dev); |
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return scnprintf(buf, PAGE_SIZE, "%c\n", bus->model); |
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} |
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static DEVICE_ATTR_RO(model); |
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static ssize_t minor_show(struct device *dev, struct device_attribute *attr, |
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char *buf) |
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{ |
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struct mcb_bus *bus = to_mcb_bus(dev); |
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return scnprintf(buf, PAGE_SIZE, "%d\n", bus->minor); |
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} |
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static DEVICE_ATTR_RO(minor); |
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static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
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char *buf) |
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{ |
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struct mcb_bus *bus = to_mcb_bus(dev); |
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return scnprintf(buf, PAGE_SIZE, "%s\n", bus->name); |
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} |
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static DEVICE_ATTR_RO(name); |
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static struct attribute *mcb_bus_attrs[] = { |
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&dev_attr_revision.attr, |
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&dev_attr_model.attr, |
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&dev_attr_minor.attr, |
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&dev_attr_name.attr, |
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NULL, |
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}; |
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static const struct attribute_group mcb_carrier_group = { |
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.attrs = mcb_bus_attrs, |
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}; |
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static const struct attribute_group *mcb_carrier_groups[] = { |
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&mcb_carrier_group, |
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NULL, |
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}; |
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static struct bus_type mcb_bus_type = { |
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.name = "mcb", |
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.match = mcb_match, |
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.uevent = mcb_uevent, |
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.probe = mcb_probe, |
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.remove = mcb_remove, |
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.shutdown = mcb_shutdown, |
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}; |
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static struct device_type mcb_carrier_device_type = { |
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.name = "mcb-carrier", |
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.groups = mcb_carrier_groups, |
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}; |
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/** |
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* __mcb_register_driver() - Register a @mcb_driver at the system |
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* @drv: The @mcb_driver |
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* @owner: The @mcb_driver's module |
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* @mod_name: The name of the @mcb_driver's module |
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* |
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* Register a @mcb_driver at the system. Perform some sanity checks, if |
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* the .probe and .remove methods are provided by the driver. |
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*/ |
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int __mcb_register_driver(struct mcb_driver *drv, struct module *owner, |
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const char *mod_name) |
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{ |
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if (!drv->probe || !drv->remove) |
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return -EINVAL; |
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drv->driver.owner = owner; |
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drv->driver.bus = &mcb_bus_type; |
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drv->driver.mod_name = mod_name; |
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return driver_register(&drv->driver); |
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} |
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EXPORT_SYMBOL_NS_GPL(__mcb_register_driver, MCB); |
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/** |
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* mcb_unregister_driver() - Unregister a @mcb_driver from the system |
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* @drv: The @mcb_driver |
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* |
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* Unregister a @mcb_driver from the system. |
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*/ |
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void mcb_unregister_driver(struct mcb_driver *drv) |
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{ |
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driver_unregister(&drv->driver); |
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} |
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EXPORT_SYMBOL_NS_GPL(mcb_unregister_driver, MCB); |
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static void mcb_release_dev(struct device *dev) |
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{ |
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struct mcb_device *mdev = to_mcb_device(dev); |
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mcb_bus_put(mdev->bus); |
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kfree(mdev); |
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} |
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/** |
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* mcb_device_register() - Register a mcb_device |
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* @bus: The @mcb_bus of the device |
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* @dev: The @mcb_device |
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* |
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* Register a specific @mcb_device at a @mcb_bus and the system itself. |
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*/ |
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int mcb_device_register(struct mcb_bus *bus, struct mcb_device *dev) |
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{ |
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int ret; |
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int device_id; |
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device_initialize(&dev->dev); |
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mcb_bus_get(bus); |
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dev->dev.bus = &mcb_bus_type; |
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dev->dev.parent = bus->dev.parent; |
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dev->dev.release = mcb_release_dev; |
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dev->dma_dev = bus->carrier; |
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device_id = dev->id; |
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dev_set_name(&dev->dev, "mcb%d-16z%03d-%d:%d:%d", |
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bus->bus_nr, device_id, dev->inst, dev->group, dev->var); |
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ret = device_add(&dev->dev); |
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if (ret < 0) { |
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pr_err("Failed registering device 16z%03d on bus mcb%d (%d)\n", |
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device_id, bus->bus_nr, ret); |
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goto out; |
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} |
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return 0; |
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out: |
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return ret; |
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} |
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EXPORT_SYMBOL_NS_GPL(mcb_device_register, MCB); |
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static void mcb_free_bus(struct device *dev) |
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{ |
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struct mcb_bus *bus = to_mcb_bus(dev); |
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put_device(bus->carrier); |
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ida_simple_remove(&mcb_ida, bus->bus_nr); |
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kfree(bus); |
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} |
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/** |
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* mcb_alloc_bus() - Allocate a new @mcb_bus |
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* |
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* Allocate a new @mcb_bus. |
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*/ |
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struct mcb_bus *mcb_alloc_bus(struct device *carrier) |
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{ |
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struct mcb_bus *bus; |
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int bus_nr; |
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int rc; |
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bus = kzalloc(sizeof(struct mcb_bus), GFP_KERNEL); |
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if (!bus) |
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return ERR_PTR(-ENOMEM); |
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bus_nr = ida_simple_get(&mcb_ida, 0, 0, GFP_KERNEL); |
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if (bus_nr < 0) { |
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rc = bus_nr; |
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goto err_free; |
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} |
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bus->bus_nr = bus_nr; |
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bus->carrier = get_device(carrier); |
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device_initialize(&bus->dev); |
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bus->dev.parent = carrier; |
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bus->dev.bus = &mcb_bus_type; |
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bus->dev.type = &mcb_carrier_device_type; |
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bus->dev.release = &mcb_free_bus; |
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dev_set_name(&bus->dev, "mcb:%d", bus_nr); |
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rc = device_add(&bus->dev); |
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if (rc) |
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goto err_free; |
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return bus; |
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err_free: |
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put_device(carrier); |
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kfree(bus); |
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return ERR_PTR(rc); |
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} |
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EXPORT_SYMBOL_NS_GPL(mcb_alloc_bus, MCB); |
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static int __mcb_devices_unregister(struct device *dev, void *data) |
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{ |
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device_unregister(dev); |
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return 0; |
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} |
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static void mcb_devices_unregister(struct mcb_bus *bus) |
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{ |
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bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_devices_unregister); |
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} |
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/** |
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* mcb_release_bus() - Free a @mcb_bus |
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* @bus: The @mcb_bus to release |
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* |
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* Release an allocated @mcb_bus from the system. |
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*/ |
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void mcb_release_bus(struct mcb_bus *bus) |
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{ |
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mcb_devices_unregister(bus); |
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} |
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EXPORT_SYMBOL_NS_GPL(mcb_release_bus, MCB); |
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/** |
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* mcb_bus_put() - Increment refcnt |
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* @bus: The @mcb_bus |
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* |
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* Get a @mcb_bus' ref |
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*/ |
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struct mcb_bus *mcb_bus_get(struct mcb_bus *bus) |
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{ |
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if (bus) |
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get_device(&bus->dev); |
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return bus; |
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} |
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EXPORT_SYMBOL_NS_GPL(mcb_bus_get, MCB); |
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/** |
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* mcb_bus_put() - Decrement refcnt |
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* @bus: The @mcb_bus |
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* |
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* Release a @mcb_bus' ref |
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*/ |
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void mcb_bus_put(struct mcb_bus *bus) |
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{ |
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if (bus) |
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put_device(&bus->dev); |
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} |
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EXPORT_SYMBOL_NS_GPL(mcb_bus_put, MCB); |
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/** |
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* mcb_alloc_dev() - Allocate a device |
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* @bus: The @mcb_bus the device is part of |
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* |
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* Allocate a @mcb_device and add bus. |
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*/ |
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struct mcb_device *mcb_alloc_dev(struct mcb_bus *bus) |
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{ |
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struct mcb_device *dev; |
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dev = kzalloc(sizeof(struct mcb_device), GFP_KERNEL); |
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if (!dev) |
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return NULL; |
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dev->bus = bus; |
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return dev; |
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} |
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EXPORT_SYMBOL_NS_GPL(mcb_alloc_dev, MCB); |
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/** |
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* mcb_free_dev() - Free @mcb_device |
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* @dev: The device to free |
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* |
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* Free a @mcb_device |
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*/ |
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void mcb_free_dev(struct mcb_device *dev) |
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{ |
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kfree(dev); |
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} |
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EXPORT_SYMBOL_NS_GPL(mcb_free_dev, MCB); |
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static int __mcb_bus_add_devices(struct device *dev, void *data) |
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{ |
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struct mcb_device *mdev = to_mcb_device(dev); |
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int retval; |
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if (mdev->is_added) |
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return 0; |
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retval = device_attach(dev); |
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if (retval < 0) |
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dev_err(dev, "Error adding device (%d)\n", retval); |
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mdev->is_added = true; |
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return 0; |
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} |
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/** |
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* mcb_bus_add_devices() - Add devices in the bus' internal device list |
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* @bus: The @mcb_bus we add the devices |
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* |
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* Add devices in the bus' internal device list to the system. |
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*/ |
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void mcb_bus_add_devices(const struct mcb_bus *bus) |
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{ |
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bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_bus_add_devices); |
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} |
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EXPORT_SYMBOL_NS_GPL(mcb_bus_add_devices, MCB); |
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/** |
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* mcb_get_resource() - get a resource for a mcb device |
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* @dev: the mcb device |
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* @type: the type of resource |
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*/ |
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struct resource *mcb_get_resource(struct mcb_device *dev, unsigned int type) |
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{ |
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if (type == IORESOURCE_MEM) |
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return &dev->mem; |
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else if (type == IORESOURCE_IRQ) |
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return &dev->irq; |
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else |
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return NULL; |
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} |
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EXPORT_SYMBOL_NS_GPL(mcb_get_resource, MCB); |
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/** |
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* mcb_request_mem() - Request memory |
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* @dev: The @mcb_device the memory is for |
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* @name: The name for the memory reference. |
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* |
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* Request memory for a @mcb_device. If @name is NULL the driver name will |
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* be used. |
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*/ |
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struct resource *mcb_request_mem(struct mcb_device *dev, const char *name) |
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{ |
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struct resource *mem; |
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u32 size; |
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if (!name) |
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name = dev->dev.driver->name; |
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size = resource_size(&dev->mem); |
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mem = request_mem_region(dev->mem.start, size, name); |
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if (!mem) |
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return ERR_PTR(-EBUSY); |
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return mem; |
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} |
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EXPORT_SYMBOL_NS_GPL(mcb_request_mem, MCB); |
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/** |
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* mcb_release_mem() - Release memory requested by device |
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* @dev: The @mcb_device that requested the memory |
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* |
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* Release memory that was prior requested via @mcb_request_mem(). |
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*/ |
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void mcb_release_mem(struct resource *mem) |
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{ |
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u32 size; |
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size = resource_size(mem); |
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release_mem_region(mem->start, size); |
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} |
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EXPORT_SYMBOL_NS_GPL(mcb_release_mem, MCB); |
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static int __mcb_get_irq(struct mcb_device *dev) |
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{ |
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struct resource *irq; |
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irq = mcb_get_resource(dev, IORESOURCE_IRQ); |
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return irq->start; |
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} |
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/** |
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* mcb_get_irq() - Get device's IRQ number |
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* @dev: The @mcb_device the IRQ is for |
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* |
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* Get the IRQ number of a given @mcb_device. |
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*/ |
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int mcb_get_irq(struct mcb_device *dev) |
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{ |
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struct mcb_bus *bus = dev->bus; |
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if (bus->get_irq) |
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return bus->get_irq(dev); |
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return __mcb_get_irq(dev); |
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} |
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EXPORT_SYMBOL_NS_GPL(mcb_get_irq, MCB); |
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static int mcb_init(void) |
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{ |
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return bus_register(&mcb_bus_type); |
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} |
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static void mcb_exit(void) |
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{ |
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ida_destroy(&mcb_ida); |
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bus_unregister(&mcb_bus_type); |
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} |
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/* mcb must be initialized after PCI but before the chameleon drivers. |
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* That means we must use some initcall between subsys_initcall and |
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* device_initcall. |
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*/ |
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fs_initcall(mcb_init); |
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module_exit(mcb_exit); |
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MODULE_DESCRIPTION("MEN Chameleon Bus Driver"); |
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MODULE_AUTHOR("Johannes Thumshirn <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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