13764e82eSJohannes Thumshirn /* 23764e82eSJohannes Thumshirn * MEN Chameleon Bus. 33764e82eSJohannes Thumshirn * 43764e82eSJohannes Thumshirn * Copyright (C) 2013 MEN Mikroelektronik GmbH (www.men.de) 53764e82eSJohannes Thumshirn * Author: Johannes Thumshirn <johannes.thumshirn@men.de> 63764e82eSJohannes Thumshirn * 73764e82eSJohannes Thumshirn * This program is free software; you can redistribute it and/or modify it 83764e82eSJohannes Thumshirn * under the terms of the GNU General Public License as published by the Free 93764e82eSJohannes Thumshirn * Software Foundation; version 2 of the License. 103764e82eSJohannes Thumshirn */ 113764e82eSJohannes Thumshirn #include <linux/kernel.h> 123764e82eSJohannes Thumshirn #include <linux/module.h> 133764e82eSJohannes Thumshirn #include <linux/slab.h> 143764e82eSJohannes Thumshirn #include <linux/types.h> 153764e82eSJohannes Thumshirn #include <linux/idr.h> 163764e82eSJohannes Thumshirn #include <linux/mcb.h> 173764e82eSJohannes Thumshirn 183764e82eSJohannes Thumshirn static DEFINE_IDA(mcb_ida); 193764e82eSJohannes Thumshirn 203764e82eSJohannes Thumshirn static const struct mcb_device_id *mcb_match_id(const struct mcb_device_id *ids, 213764e82eSJohannes Thumshirn struct mcb_device *dev) 223764e82eSJohannes Thumshirn { 233764e82eSJohannes Thumshirn if (ids) { 243764e82eSJohannes Thumshirn while (ids->device) { 253764e82eSJohannes Thumshirn if (ids->device == dev->id) 263764e82eSJohannes Thumshirn return ids; 273764e82eSJohannes Thumshirn ids++; 283764e82eSJohannes Thumshirn } 293764e82eSJohannes Thumshirn } 303764e82eSJohannes Thumshirn 313764e82eSJohannes Thumshirn return NULL; 323764e82eSJohannes Thumshirn } 333764e82eSJohannes Thumshirn 343764e82eSJohannes Thumshirn static int mcb_match(struct device *dev, struct device_driver *drv) 353764e82eSJohannes Thumshirn { 363764e82eSJohannes Thumshirn struct mcb_driver *mdrv = to_mcb_driver(drv); 373764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 383764e82eSJohannes Thumshirn const struct mcb_device_id *found_id; 393764e82eSJohannes Thumshirn 403764e82eSJohannes Thumshirn found_id = mcb_match_id(mdrv->id_table, mdev); 413764e82eSJohannes Thumshirn if (found_id) 423764e82eSJohannes Thumshirn return 1; 433764e82eSJohannes Thumshirn 443764e82eSJohannes Thumshirn return 0; 453764e82eSJohannes Thumshirn } 463764e82eSJohannes Thumshirn 473764e82eSJohannes Thumshirn static int mcb_uevent(struct device *dev, struct kobj_uevent_env *env) 483764e82eSJohannes Thumshirn { 493764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 503764e82eSJohannes Thumshirn int ret; 513764e82eSJohannes Thumshirn 523764e82eSJohannes Thumshirn ret = add_uevent_var(env, "MODALIAS=mcb:16z%03d", mdev->id); 533764e82eSJohannes Thumshirn if (ret) 543764e82eSJohannes Thumshirn return -ENOMEM; 553764e82eSJohannes Thumshirn 563764e82eSJohannes Thumshirn return 0; 573764e82eSJohannes Thumshirn } 583764e82eSJohannes Thumshirn 593764e82eSJohannes Thumshirn static int mcb_probe(struct device *dev) 603764e82eSJohannes Thumshirn { 613764e82eSJohannes Thumshirn struct mcb_driver *mdrv = to_mcb_driver(dev->driver); 623764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 633764e82eSJohannes Thumshirn const struct mcb_device_id *found_id; 643764e82eSJohannes Thumshirn 653764e82eSJohannes Thumshirn found_id = mcb_match_id(mdrv->id_table, mdev); 663764e82eSJohannes Thumshirn if (!found_id) 673764e82eSJohannes Thumshirn return -ENODEV; 683764e82eSJohannes Thumshirn 693764e82eSJohannes Thumshirn return mdrv->probe(mdev, found_id); 703764e82eSJohannes Thumshirn } 713764e82eSJohannes Thumshirn 723764e82eSJohannes Thumshirn static int mcb_remove(struct device *dev) 733764e82eSJohannes Thumshirn { 743764e82eSJohannes Thumshirn struct mcb_driver *mdrv = to_mcb_driver(dev->driver); 753764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 763764e82eSJohannes Thumshirn 773764e82eSJohannes Thumshirn mdrv->remove(mdev); 783764e82eSJohannes Thumshirn 793764e82eSJohannes Thumshirn put_device(&mdev->dev); 803764e82eSJohannes Thumshirn 813764e82eSJohannes Thumshirn return 0; 823764e82eSJohannes Thumshirn } 833764e82eSJohannes Thumshirn 843764e82eSJohannes Thumshirn static void mcb_shutdown(struct device *dev) 853764e82eSJohannes Thumshirn { 863764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 873764e82eSJohannes Thumshirn struct mcb_driver *mdrv = mdev->driver; 883764e82eSJohannes Thumshirn 893764e82eSJohannes Thumshirn if (mdrv && mdrv->shutdown) 903764e82eSJohannes Thumshirn mdrv->shutdown(mdev); 913764e82eSJohannes Thumshirn } 923764e82eSJohannes Thumshirn 933764e82eSJohannes Thumshirn static struct bus_type mcb_bus_type = { 943764e82eSJohannes Thumshirn .name = "mcb", 953764e82eSJohannes Thumshirn .match = mcb_match, 963764e82eSJohannes Thumshirn .uevent = mcb_uevent, 973764e82eSJohannes Thumshirn .probe = mcb_probe, 983764e82eSJohannes Thumshirn .remove = mcb_remove, 993764e82eSJohannes Thumshirn .shutdown = mcb_shutdown, 1003764e82eSJohannes Thumshirn }; 1013764e82eSJohannes Thumshirn 1023764e82eSJohannes Thumshirn /** 1033764e82eSJohannes Thumshirn * __mcb_register_driver() - Register a @mcb_driver at the system 1043764e82eSJohannes Thumshirn * @drv: The @mcb_driver 1053764e82eSJohannes Thumshirn * @owner: The @mcb_driver's module 1063764e82eSJohannes Thumshirn * @mod_name: The name of the @mcb_driver's module 1073764e82eSJohannes Thumshirn * 1083764e82eSJohannes Thumshirn * Register a @mcb_driver at the system. Perform some sanity checks, if 1093764e82eSJohannes Thumshirn * the .probe and .remove methods are provided by the driver. 1103764e82eSJohannes Thumshirn */ 1113764e82eSJohannes Thumshirn int __mcb_register_driver(struct mcb_driver *drv, struct module *owner, 1123764e82eSJohannes Thumshirn const char *mod_name) 1133764e82eSJohannes Thumshirn { 1143764e82eSJohannes Thumshirn if (!drv->probe || !drv->remove) 1153764e82eSJohannes Thumshirn return -EINVAL; 1163764e82eSJohannes Thumshirn 1173764e82eSJohannes Thumshirn drv->driver.owner = owner; 1183764e82eSJohannes Thumshirn drv->driver.bus = &mcb_bus_type; 1193764e82eSJohannes Thumshirn drv->driver.mod_name = mod_name; 1203764e82eSJohannes Thumshirn 1213764e82eSJohannes Thumshirn return driver_register(&drv->driver); 1223764e82eSJohannes Thumshirn } 1233764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(__mcb_register_driver); 1243764e82eSJohannes Thumshirn 1253764e82eSJohannes Thumshirn /** 1263764e82eSJohannes Thumshirn * mcb_unregister_driver() - Unregister a @mcb_driver from the system 1273764e82eSJohannes Thumshirn * @drv: The @mcb_driver 1283764e82eSJohannes Thumshirn * 1293764e82eSJohannes Thumshirn * Unregister a @mcb_driver from the system. 1303764e82eSJohannes Thumshirn */ 1313764e82eSJohannes Thumshirn void mcb_unregister_driver(struct mcb_driver *drv) 1323764e82eSJohannes Thumshirn { 1333764e82eSJohannes Thumshirn driver_unregister(&drv->driver); 1343764e82eSJohannes Thumshirn } 1353764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_unregister_driver); 1363764e82eSJohannes Thumshirn 1373764e82eSJohannes Thumshirn static void mcb_release_dev(struct device *dev) 1383764e82eSJohannes Thumshirn { 1393764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 1403764e82eSJohannes Thumshirn 1413764e82eSJohannes Thumshirn mcb_bus_put(mdev->bus); 1423764e82eSJohannes Thumshirn kfree(mdev); 1433764e82eSJohannes Thumshirn } 1443764e82eSJohannes Thumshirn 1453764e82eSJohannes Thumshirn /** 1463764e82eSJohannes Thumshirn * mcb_device_register() - Register a mcb_device 1473764e82eSJohannes Thumshirn * @bus: The @mcb_bus of the device 1483764e82eSJohannes Thumshirn * @dev: The @mcb_device 1493764e82eSJohannes Thumshirn * 1503764e82eSJohannes Thumshirn * Register a specific @mcb_device at a @mcb_bus and the system itself. 1513764e82eSJohannes Thumshirn */ 1523764e82eSJohannes Thumshirn int mcb_device_register(struct mcb_bus *bus, struct mcb_device *dev) 1533764e82eSJohannes Thumshirn { 1543764e82eSJohannes Thumshirn int ret; 1553764e82eSJohannes Thumshirn int device_id; 1563764e82eSJohannes Thumshirn 1573764e82eSJohannes Thumshirn device_initialize(&dev->dev); 1583764e82eSJohannes Thumshirn dev->dev.bus = &mcb_bus_type; 1593764e82eSJohannes Thumshirn dev->dev.parent = bus->dev.parent; 1603764e82eSJohannes Thumshirn dev->dev.release = mcb_release_dev; 1613764e82eSJohannes Thumshirn 1623764e82eSJohannes Thumshirn device_id = dev->id; 1633764e82eSJohannes Thumshirn dev_set_name(&dev->dev, "mcb%d-16z%03d-%d:%d:%d", 1643764e82eSJohannes Thumshirn bus->bus_nr, device_id, dev->inst, dev->group, dev->var); 1653764e82eSJohannes Thumshirn 1663764e82eSJohannes Thumshirn ret = device_add(&dev->dev); 1673764e82eSJohannes Thumshirn if (ret < 0) { 1683764e82eSJohannes Thumshirn pr_err("Failed registering device 16z%03d on bus mcb%d (%d)\n", 1693764e82eSJohannes Thumshirn device_id, bus->bus_nr, ret); 1703764e82eSJohannes Thumshirn goto out; 1713764e82eSJohannes Thumshirn } 1723764e82eSJohannes Thumshirn 1733764e82eSJohannes Thumshirn return 0; 1743764e82eSJohannes Thumshirn 1753764e82eSJohannes Thumshirn out: 1763764e82eSJohannes Thumshirn 1773764e82eSJohannes Thumshirn return ret; 1783764e82eSJohannes Thumshirn } 1793764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_device_register); 1803764e82eSJohannes Thumshirn 1813764e82eSJohannes Thumshirn /** 1823764e82eSJohannes Thumshirn * mcb_alloc_bus() - Allocate a new @mcb_bus 1833764e82eSJohannes Thumshirn * 1843764e82eSJohannes Thumshirn * Allocate a new @mcb_bus. 1853764e82eSJohannes Thumshirn */ 1864ec65b77SJohannes Thumshirn struct mcb_bus *mcb_alloc_bus(struct device *carrier) 1873764e82eSJohannes Thumshirn { 1883764e82eSJohannes Thumshirn struct mcb_bus *bus; 1893764e82eSJohannes Thumshirn int bus_nr; 190*18d28819SJohannes Thumshirn int rc; 1913764e82eSJohannes Thumshirn 1923764e82eSJohannes Thumshirn bus = kzalloc(sizeof(struct mcb_bus), GFP_KERNEL); 1933764e82eSJohannes Thumshirn if (!bus) 1944ec65b77SJohannes Thumshirn return ERR_PTR(-ENOMEM); 1953764e82eSJohannes Thumshirn 1963764e82eSJohannes Thumshirn bus_nr = ida_simple_get(&mcb_ida, 0, 0, GFP_KERNEL); 1973764e82eSJohannes Thumshirn if (bus_nr < 0) { 198*18d28819SJohannes Thumshirn rc = bus_nr; 199*18d28819SJohannes Thumshirn goto err_free; 2003764e82eSJohannes Thumshirn } 2013764e82eSJohannes Thumshirn 2023764e82eSJohannes Thumshirn bus->bus_nr = bus_nr; 2034ec65b77SJohannes Thumshirn bus->carrier = carrier; 204*18d28819SJohannes Thumshirn 205*18d28819SJohannes Thumshirn device_initialize(&bus->dev); 206*18d28819SJohannes Thumshirn bus->dev.parent = carrier; 207*18d28819SJohannes Thumshirn bus->dev.bus = &mcb_bus_type; 208*18d28819SJohannes Thumshirn 209*18d28819SJohannes Thumshirn dev_set_name(&bus->dev, "mcb:%d", bus_nr); 210*18d28819SJohannes Thumshirn rc = device_add(&bus->dev); 211*18d28819SJohannes Thumshirn if (rc) 212*18d28819SJohannes Thumshirn goto err_free; 213*18d28819SJohannes Thumshirn 2143764e82eSJohannes Thumshirn return bus; 215*18d28819SJohannes Thumshirn err_free: 216*18d28819SJohannes Thumshirn kfree(bus); 217*18d28819SJohannes Thumshirn return ERR_PTR(rc); 2183764e82eSJohannes Thumshirn } 2193764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_alloc_bus); 2203764e82eSJohannes Thumshirn 2213764e82eSJohannes Thumshirn static int __mcb_devices_unregister(struct device *dev, void *data) 2223764e82eSJohannes Thumshirn { 2233764e82eSJohannes Thumshirn device_unregister(dev); 2243764e82eSJohannes Thumshirn return 0; 2253764e82eSJohannes Thumshirn } 2263764e82eSJohannes Thumshirn 2273764e82eSJohannes Thumshirn static void mcb_devices_unregister(struct mcb_bus *bus) 2283764e82eSJohannes Thumshirn { 2293764e82eSJohannes Thumshirn bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_devices_unregister); 2303764e82eSJohannes Thumshirn } 2313764e82eSJohannes Thumshirn /** 2323764e82eSJohannes Thumshirn * mcb_release_bus() - Free a @mcb_bus 2333764e82eSJohannes Thumshirn * @bus: The @mcb_bus to release 2343764e82eSJohannes Thumshirn * 2353764e82eSJohannes Thumshirn * Release an allocated @mcb_bus from the system. 2363764e82eSJohannes Thumshirn */ 2373764e82eSJohannes Thumshirn void mcb_release_bus(struct mcb_bus *bus) 2383764e82eSJohannes Thumshirn { 2393764e82eSJohannes Thumshirn mcb_devices_unregister(bus); 2403764e82eSJohannes Thumshirn 2413764e82eSJohannes Thumshirn ida_simple_remove(&mcb_ida, bus->bus_nr); 2423764e82eSJohannes Thumshirn 2433764e82eSJohannes Thumshirn kfree(bus); 2443764e82eSJohannes Thumshirn } 2453764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_release_bus); 2463764e82eSJohannes Thumshirn 2473764e82eSJohannes Thumshirn /** 2483764e82eSJohannes Thumshirn * mcb_bus_put() - Increment refcnt 2493764e82eSJohannes Thumshirn * @bus: The @mcb_bus 2503764e82eSJohannes Thumshirn * 2513764e82eSJohannes Thumshirn * Get a @mcb_bus' ref 2523764e82eSJohannes Thumshirn */ 2533764e82eSJohannes Thumshirn struct mcb_bus *mcb_bus_get(struct mcb_bus *bus) 2543764e82eSJohannes Thumshirn { 2553764e82eSJohannes Thumshirn if (bus) 2563764e82eSJohannes Thumshirn get_device(&bus->dev); 2573764e82eSJohannes Thumshirn 2583764e82eSJohannes Thumshirn return bus; 2593764e82eSJohannes Thumshirn } 2603764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_bus_get); 2613764e82eSJohannes Thumshirn 2623764e82eSJohannes Thumshirn /** 2633764e82eSJohannes Thumshirn * mcb_bus_put() - Decrement refcnt 2643764e82eSJohannes Thumshirn * @bus: The @mcb_bus 2653764e82eSJohannes Thumshirn * 2663764e82eSJohannes Thumshirn * Release a @mcb_bus' ref 2673764e82eSJohannes Thumshirn */ 2683764e82eSJohannes Thumshirn void mcb_bus_put(struct mcb_bus *bus) 2693764e82eSJohannes Thumshirn { 2703764e82eSJohannes Thumshirn if (bus) 2713764e82eSJohannes Thumshirn put_device(&bus->dev); 2723764e82eSJohannes Thumshirn } 2733764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_bus_put); 2743764e82eSJohannes Thumshirn 2753764e82eSJohannes Thumshirn /** 2763764e82eSJohannes Thumshirn * mcb_alloc_dev() - Allocate a device 2773764e82eSJohannes Thumshirn * @bus: The @mcb_bus the device is part of 2783764e82eSJohannes Thumshirn * 2793764e82eSJohannes Thumshirn * Allocate a @mcb_device and add bus. 2803764e82eSJohannes Thumshirn */ 2813764e82eSJohannes Thumshirn struct mcb_device *mcb_alloc_dev(struct mcb_bus *bus) 2823764e82eSJohannes Thumshirn { 2833764e82eSJohannes Thumshirn struct mcb_device *dev; 2843764e82eSJohannes Thumshirn 2853764e82eSJohannes Thumshirn dev = kzalloc(sizeof(struct mcb_device), GFP_KERNEL); 2863764e82eSJohannes Thumshirn if (!dev) 2873764e82eSJohannes Thumshirn return NULL; 2883764e82eSJohannes Thumshirn 2893764e82eSJohannes Thumshirn INIT_LIST_HEAD(&dev->bus_list); 2903764e82eSJohannes Thumshirn dev->bus = bus; 2913764e82eSJohannes Thumshirn 2923764e82eSJohannes Thumshirn return dev; 2933764e82eSJohannes Thumshirn } 2943764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_alloc_dev); 2953764e82eSJohannes Thumshirn 2963764e82eSJohannes Thumshirn /** 2973764e82eSJohannes Thumshirn * mcb_free_dev() - Free @mcb_device 2983764e82eSJohannes Thumshirn * @dev: The device to free 2993764e82eSJohannes Thumshirn * 3003764e82eSJohannes Thumshirn * Free a @mcb_device 3013764e82eSJohannes Thumshirn */ 3023764e82eSJohannes Thumshirn void mcb_free_dev(struct mcb_device *dev) 3033764e82eSJohannes Thumshirn { 3043764e82eSJohannes Thumshirn kfree(dev); 3053764e82eSJohannes Thumshirn } 3063764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_free_dev); 3073764e82eSJohannes Thumshirn 3083764e82eSJohannes Thumshirn static int __mcb_bus_add_devices(struct device *dev, void *data) 3093764e82eSJohannes Thumshirn { 3103764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 3113764e82eSJohannes Thumshirn int retval; 3123764e82eSJohannes Thumshirn 3133764e82eSJohannes Thumshirn if (mdev->is_added) 3143764e82eSJohannes Thumshirn return 0; 3153764e82eSJohannes Thumshirn 3163764e82eSJohannes Thumshirn retval = device_attach(dev); 3173764e82eSJohannes Thumshirn if (retval < 0) 3183764e82eSJohannes Thumshirn dev_err(dev, "Error adding device (%d)\n", retval); 3193764e82eSJohannes Thumshirn 3203764e82eSJohannes Thumshirn mdev->is_added = true; 3213764e82eSJohannes Thumshirn 3223764e82eSJohannes Thumshirn return 0; 3233764e82eSJohannes Thumshirn } 3243764e82eSJohannes Thumshirn 3253764e82eSJohannes Thumshirn static int __mcb_bus_add_child(struct device *dev, void *data) 3263764e82eSJohannes Thumshirn { 3273764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 3283764e82eSJohannes Thumshirn struct mcb_bus *child; 3293764e82eSJohannes Thumshirn 3303764e82eSJohannes Thumshirn BUG_ON(!mdev->is_added); 3313764e82eSJohannes Thumshirn child = mdev->subordinate; 3323764e82eSJohannes Thumshirn 3333764e82eSJohannes Thumshirn if (child) 3343764e82eSJohannes Thumshirn mcb_bus_add_devices(child); 3353764e82eSJohannes Thumshirn 3363764e82eSJohannes Thumshirn return 0; 3373764e82eSJohannes Thumshirn } 3383764e82eSJohannes Thumshirn 3393764e82eSJohannes Thumshirn /** 3403764e82eSJohannes Thumshirn * mcb_bus_add_devices() - Add devices in the bus' internal device list 3413764e82eSJohannes Thumshirn * @bus: The @mcb_bus we add the devices 3423764e82eSJohannes Thumshirn * 3433764e82eSJohannes Thumshirn * Add devices in the bus' internal device list to the system. 3443764e82eSJohannes Thumshirn */ 3453764e82eSJohannes Thumshirn void mcb_bus_add_devices(const struct mcb_bus *bus) 3463764e82eSJohannes Thumshirn { 3473764e82eSJohannes Thumshirn bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_bus_add_devices); 3483764e82eSJohannes Thumshirn bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_bus_add_child); 3493764e82eSJohannes Thumshirn 3503764e82eSJohannes Thumshirn } 3513764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_bus_add_devices); 3523764e82eSJohannes Thumshirn 3533764e82eSJohannes Thumshirn /** 3543764e82eSJohannes Thumshirn * mcb_request_mem() - Request memory 3553764e82eSJohannes Thumshirn * @dev: The @mcb_device the memory is for 3563764e82eSJohannes Thumshirn * @name: The name for the memory reference. 3573764e82eSJohannes Thumshirn * 3583764e82eSJohannes Thumshirn * Request memory for a @mcb_device. If @name is NULL the driver name will 3593764e82eSJohannes Thumshirn * be used. 3603764e82eSJohannes Thumshirn */ 3613764e82eSJohannes Thumshirn struct resource *mcb_request_mem(struct mcb_device *dev, const char *name) 3623764e82eSJohannes Thumshirn { 3633764e82eSJohannes Thumshirn struct resource *mem; 3643764e82eSJohannes Thumshirn u32 size; 3653764e82eSJohannes Thumshirn 3663764e82eSJohannes Thumshirn if (!name) 3673764e82eSJohannes Thumshirn name = dev->dev.driver->name; 3683764e82eSJohannes Thumshirn 3693764e82eSJohannes Thumshirn size = resource_size(&dev->mem); 3703764e82eSJohannes Thumshirn 3713764e82eSJohannes Thumshirn mem = request_mem_region(dev->mem.start, size, name); 3723764e82eSJohannes Thumshirn if (!mem) 3733764e82eSJohannes Thumshirn return ERR_PTR(-EBUSY); 3743764e82eSJohannes Thumshirn 3753764e82eSJohannes Thumshirn return mem; 3763764e82eSJohannes Thumshirn } 3773764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_request_mem); 3783764e82eSJohannes Thumshirn 3793764e82eSJohannes Thumshirn /** 3803764e82eSJohannes Thumshirn * mcb_release_mem() - Release memory requested by device 3813764e82eSJohannes Thumshirn * @dev: The @mcb_device that requested the memory 3823764e82eSJohannes Thumshirn * 3833764e82eSJohannes Thumshirn * Release memory that was prior requested via @mcb_request_mem(). 3843764e82eSJohannes Thumshirn */ 3853764e82eSJohannes Thumshirn void mcb_release_mem(struct resource *mem) 3863764e82eSJohannes Thumshirn { 3873764e82eSJohannes Thumshirn u32 size; 3883764e82eSJohannes Thumshirn 3893764e82eSJohannes Thumshirn size = resource_size(mem); 3903764e82eSJohannes Thumshirn release_mem_region(mem->start, size); 3913764e82eSJohannes Thumshirn } 3923764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_release_mem); 3933764e82eSJohannes Thumshirn 3944ec65b77SJohannes Thumshirn static int __mcb_get_irq(struct mcb_device *dev) 3954ec65b77SJohannes Thumshirn { 3964ec65b77SJohannes Thumshirn struct resource *irq = &dev->irq; 3974ec65b77SJohannes Thumshirn 3984ec65b77SJohannes Thumshirn return irq->start; 3994ec65b77SJohannes Thumshirn } 4004ec65b77SJohannes Thumshirn 4013764e82eSJohannes Thumshirn /** 4023764e82eSJohannes Thumshirn * mcb_get_irq() - Get device's IRQ number 4033764e82eSJohannes Thumshirn * @dev: The @mcb_device the IRQ is for 4043764e82eSJohannes Thumshirn * 4053764e82eSJohannes Thumshirn * Get the IRQ number of a given @mcb_device. 4063764e82eSJohannes Thumshirn */ 4073764e82eSJohannes Thumshirn int mcb_get_irq(struct mcb_device *dev) 4083764e82eSJohannes Thumshirn { 4094ec65b77SJohannes Thumshirn struct mcb_bus *bus = dev->bus; 4103764e82eSJohannes Thumshirn 4114ec65b77SJohannes Thumshirn if (bus->get_irq) 4124ec65b77SJohannes Thumshirn return bus->get_irq(dev); 4134ec65b77SJohannes Thumshirn 4144ec65b77SJohannes Thumshirn return __mcb_get_irq(dev); 4153764e82eSJohannes Thumshirn } 4163764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_get_irq); 4173764e82eSJohannes Thumshirn 4183764e82eSJohannes Thumshirn static int mcb_init(void) 4193764e82eSJohannes Thumshirn { 4203764e82eSJohannes Thumshirn return bus_register(&mcb_bus_type); 4213764e82eSJohannes Thumshirn } 4223764e82eSJohannes Thumshirn 4233764e82eSJohannes Thumshirn static void mcb_exit(void) 4243764e82eSJohannes Thumshirn { 425169883a6SJohannes Thumshirn ida_destroy(&mcb_ida); 4263764e82eSJohannes Thumshirn bus_unregister(&mcb_bus_type); 4273764e82eSJohannes Thumshirn } 4283764e82eSJohannes Thumshirn 4293764e82eSJohannes Thumshirn /* mcb must be initialized after PCI but before the chameleon drivers. 4303764e82eSJohannes Thumshirn * That means we must use some initcall between subsys_initcall and 4313764e82eSJohannes Thumshirn * device_initcall. 4323764e82eSJohannes Thumshirn */ 4333764e82eSJohannes Thumshirn fs_initcall(mcb_init); 4343764e82eSJohannes Thumshirn module_exit(mcb_exit); 4353764e82eSJohannes Thumshirn 4363764e82eSJohannes Thumshirn MODULE_DESCRIPTION("MEN Chameleon Bus Driver"); 4373764e82eSJohannes Thumshirn MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>"); 4383764e82eSJohannes Thumshirn MODULE_LICENSE("GPL v2"); 439