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; 644d2ec857SJohannes Thumshirn struct module *carrier_mod; 654d2ec857SJohannes Thumshirn int ret; 663764e82eSJohannes Thumshirn 673764e82eSJohannes Thumshirn found_id = mcb_match_id(mdrv->id_table, mdev); 683764e82eSJohannes Thumshirn if (!found_id) 693764e82eSJohannes Thumshirn return -ENODEV; 703764e82eSJohannes Thumshirn 714d2ec857SJohannes Thumshirn carrier_mod = mdev->dev.parent->driver->owner; 724d2ec857SJohannes Thumshirn if (!try_module_get(carrier_mod)) 734d2ec857SJohannes Thumshirn return -EINVAL; 744d2ec857SJohannes Thumshirn 757bc36409SJohannes Thumshirn get_device(dev); 764d2ec857SJohannes Thumshirn ret = mdrv->probe(mdev, found_id); 774d2ec857SJohannes Thumshirn if (ret) 784d2ec857SJohannes Thumshirn module_put(carrier_mod); 794d2ec857SJohannes Thumshirn 804d2ec857SJohannes Thumshirn return ret; 813764e82eSJohannes Thumshirn } 823764e82eSJohannes Thumshirn 833764e82eSJohannes Thumshirn static int mcb_remove(struct device *dev) 843764e82eSJohannes Thumshirn { 853764e82eSJohannes Thumshirn struct mcb_driver *mdrv = to_mcb_driver(dev->driver); 863764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 874d2ec857SJohannes Thumshirn struct module *carrier_mod; 883764e82eSJohannes Thumshirn 893764e82eSJohannes Thumshirn mdrv->remove(mdev); 903764e82eSJohannes Thumshirn 914d2ec857SJohannes Thumshirn carrier_mod = mdev->dev.parent->driver->owner; 924d2ec857SJohannes Thumshirn module_put(carrier_mod); 934d2ec857SJohannes Thumshirn 943764e82eSJohannes Thumshirn put_device(&mdev->dev); 953764e82eSJohannes Thumshirn 963764e82eSJohannes Thumshirn return 0; 973764e82eSJohannes Thumshirn } 983764e82eSJohannes Thumshirn 993764e82eSJohannes Thumshirn static void mcb_shutdown(struct device *dev) 1003764e82eSJohannes Thumshirn { 1015d9e2ab9SJohannes Thumshirn struct mcb_driver *mdrv = to_mcb_driver(dev->driver); 1023764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 1033764e82eSJohannes Thumshirn 1043764e82eSJohannes Thumshirn if (mdrv && mdrv->shutdown) 1053764e82eSJohannes Thumshirn mdrv->shutdown(mdev); 1063764e82eSJohannes Thumshirn } 1073764e82eSJohannes Thumshirn 108803f1ca6SJohannes Thumshirn static ssize_t revision_show(struct device *dev, struct device_attribute *attr, 109803f1ca6SJohannes Thumshirn char *buf) 110803f1ca6SJohannes Thumshirn { 111803f1ca6SJohannes Thumshirn struct mcb_bus *bus = to_mcb_bus(dev); 112803f1ca6SJohannes Thumshirn 113803f1ca6SJohannes Thumshirn return scnprintf(buf, PAGE_SIZE, "%d\n", bus->revision); 114803f1ca6SJohannes Thumshirn } 115803f1ca6SJohannes Thumshirn static DEVICE_ATTR_RO(revision); 116803f1ca6SJohannes Thumshirn 117803f1ca6SJohannes Thumshirn static ssize_t model_show(struct device *dev, struct device_attribute *attr, 118803f1ca6SJohannes Thumshirn char *buf) 119803f1ca6SJohannes Thumshirn { 120803f1ca6SJohannes Thumshirn struct mcb_bus *bus = to_mcb_bus(dev); 121803f1ca6SJohannes Thumshirn 122803f1ca6SJohannes Thumshirn return scnprintf(buf, PAGE_SIZE, "%c\n", bus->model); 123803f1ca6SJohannes Thumshirn } 124803f1ca6SJohannes Thumshirn static DEVICE_ATTR_RO(model); 125803f1ca6SJohannes Thumshirn 126803f1ca6SJohannes Thumshirn static ssize_t minor_show(struct device *dev, struct device_attribute *attr, 127803f1ca6SJohannes Thumshirn char *buf) 128803f1ca6SJohannes Thumshirn { 129803f1ca6SJohannes Thumshirn struct mcb_bus *bus = to_mcb_bus(dev); 130803f1ca6SJohannes Thumshirn 131803f1ca6SJohannes Thumshirn return scnprintf(buf, PAGE_SIZE, "%d\n", bus->minor); 132803f1ca6SJohannes Thumshirn } 133803f1ca6SJohannes Thumshirn static DEVICE_ATTR_RO(minor); 134803f1ca6SJohannes Thumshirn 135803f1ca6SJohannes Thumshirn static ssize_t name_show(struct device *dev, struct device_attribute *attr, 136803f1ca6SJohannes Thumshirn char *buf) 137803f1ca6SJohannes Thumshirn { 138803f1ca6SJohannes Thumshirn struct mcb_bus *bus = to_mcb_bus(dev); 139803f1ca6SJohannes Thumshirn 140803f1ca6SJohannes Thumshirn return scnprintf(buf, PAGE_SIZE, "%s\n", bus->name); 141803f1ca6SJohannes Thumshirn } 142803f1ca6SJohannes Thumshirn static DEVICE_ATTR_RO(name); 143803f1ca6SJohannes Thumshirn 144803f1ca6SJohannes Thumshirn static struct attribute *mcb_bus_attrs[] = { 145803f1ca6SJohannes Thumshirn &dev_attr_revision.attr, 146803f1ca6SJohannes Thumshirn &dev_attr_model.attr, 147803f1ca6SJohannes Thumshirn &dev_attr_minor.attr, 148803f1ca6SJohannes Thumshirn &dev_attr_name.attr, 149803f1ca6SJohannes Thumshirn NULL, 150803f1ca6SJohannes Thumshirn }; 151803f1ca6SJohannes Thumshirn 152803f1ca6SJohannes Thumshirn static const struct attribute_group mcb_carrier_group = { 153803f1ca6SJohannes Thumshirn .attrs = mcb_bus_attrs, 154803f1ca6SJohannes Thumshirn }; 155803f1ca6SJohannes Thumshirn 156803f1ca6SJohannes Thumshirn static const struct attribute_group *mcb_carrier_groups[] = { 157803f1ca6SJohannes Thumshirn &mcb_carrier_group, 158803f1ca6SJohannes Thumshirn NULL, 159803f1ca6SJohannes Thumshirn }; 160803f1ca6SJohannes Thumshirn 161803f1ca6SJohannes Thumshirn 1623764e82eSJohannes Thumshirn static struct bus_type mcb_bus_type = { 1633764e82eSJohannes Thumshirn .name = "mcb", 1643764e82eSJohannes Thumshirn .match = mcb_match, 1653764e82eSJohannes Thumshirn .uevent = mcb_uevent, 1663764e82eSJohannes Thumshirn .probe = mcb_probe, 1673764e82eSJohannes Thumshirn .remove = mcb_remove, 1683764e82eSJohannes Thumshirn .shutdown = mcb_shutdown, 1693764e82eSJohannes Thumshirn }; 1703764e82eSJohannes Thumshirn 171803f1ca6SJohannes Thumshirn static struct device_type mcb_carrier_device_type = { 172803f1ca6SJohannes Thumshirn .name = "mcb-carrier", 173803f1ca6SJohannes Thumshirn .groups = mcb_carrier_groups, 174803f1ca6SJohannes Thumshirn }; 175803f1ca6SJohannes Thumshirn 1763764e82eSJohannes Thumshirn /** 1773764e82eSJohannes Thumshirn * __mcb_register_driver() - Register a @mcb_driver at the system 1783764e82eSJohannes Thumshirn * @drv: The @mcb_driver 1793764e82eSJohannes Thumshirn * @owner: The @mcb_driver's module 1803764e82eSJohannes Thumshirn * @mod_name: The name of the @mcb_driver's module 1813764e82eSJohannes Thumshirn * 1823764e82eSJohannes Thumshirn * Register a @mcb_driver at the system. Perform some sanity checks, if 1833764e82eSJohannes Thumshirn * the .probe and .remove methods are provided by the driver. 1843764e82eSJohannes Thumshirn */ 1853764e82eSJohannes Thumshirn int __mcb_register_driver(struct mcb_driver *drv, struct module *owner, 1863764e82eSJohannes Thumshirn const char *mod_name) 1873764e82eSJohannes Thumshirn { 1883764e82eSJohannes Thumshirn if (!drv->probe || !drv->remove) 1893764e82eSJohannes Thumshirn return -EINVAL; 1903764e82eSJohannes Thumshirn 1913764e82eSJohannes Thumshirn drv->driver.owner = owner; 1923764e82eSJohannes Thumshirn drv->driver.bus = &mcb_bus_type; 1933764e82eSJohannes Thumshirn drv->driver.mod_name = mod_name; 1943764e82eSJohannes Thumshirn 1953764e82eSJohannes Thumshirn return driver_register(&drv->driver); 1963764e82eSJohannes Thumshirn } 1973764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(__mcb_register_driver); 1983764e82eSJohannes Thumshirn 1993764e82eSJohannes Thumshirn /** 2003764e82eSJohannes Thumshirn * mcb_unregister_driver() - Unregister a @mcb_driver from the system 2013764e82eSJohannes Thumshirn * @drv: The @mcb_driver 2023764e82eSJohannes Thumshirn * 2033764e82eSJohannes Thumshirn * Unregister a @mcb_driver from the system. 2043764e82eSJohannes Thumshirn */ 2053764e82eSJohannes Thumshirn void mcb_unregister_driver(struct mcb_driver *drv) 2063764e82eSJohannes Thumshirn { 2073764e82eSJohannes Thumshirn driver_unregister(&drv->driver); 2083764e82eSJohannes Thumshirn } 2093764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_unregister_driver); 2103764e82eSJohannes Thumshirn 2113764e82eSJohannes Thumshirn static void mcb_release_dev(struct device *dev) 2123764e82eSJohannes Thumshirn { 2133764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 2143764e82eSJohannes Thumshirn 2153764e82eSJohannes Thumshirn mcb_bus_put(mdev->bus); 2163764e82eSJohannes Thumshirn kfree(mdev); 2173764e82eSJohannes Thumshirn } 2183764e82eSJohannes Thumshirn 2193764e82eSJohannes Thumshirn /** 2203764e82eSJohannes Thumshirn * mcb_device_register() - Register a mcb_device 2213764e82eSJohannes Thumshirn * @bus: The @mcb_bus of the device 2223764e82eSJohannes Thumshirn * @dev: The @mcb_device 2233764e82eSJohannes Thumshirn * 2243764e82eSJohannes Thumshirn * Register a specific @mcb_device at a @mcb_bus and the system itself. 2253764e82eSJohannes Thumshirn */ 2263764e82eSJohannes Thumshirn int mcb_device_register(struct mcb_bus *bus, struct mcb_device *dev) 2273764e82eSJohannes Thumshirn { 2283764e82eSJohannes Thumshirn int ret; 2293764e82eSJohannes Thumshirn int device_id; 2303764e82eSJohannes Thumshirn 2313764e82eSJohannes Thumshirn device_initialize(&dev->dev); 2325d9e2ab9SJohannes Thumshirn mcb_bus_get(bus); 2333764e82eSJohannes Thumshirn dev->dev.bus = &mcb_bus_type; 2343764e82eSJohannes Thumshirn dev->dev.parent = bus->dev.parent; 2353764e82eSJohannes Thumshirn dev->dev.release = mcb_release_dev; 2362d8784dfSMichael Moese dev->dma_dev = bus->carrier; 2373764e82eSJohannes Thumshirn 2383764e82eSJohannes Thumshirn device_id = dev->id; 2393764e82eSJohannes Thumshirn dev_set_name(&dev->dev, "mcb%d-16z%03d-%d:%d:%d", 2403764e82eSJohannes Thumshirn bus->bus_nr, device_id, dev->inst, dev->group, dev->var); 2413764e82eSJohannes Thumshirn 2423764e82eSJohannes Thumshirn ret = device_add(&dev->dev); 2433764e82eSJohannes Thumshirn if (ret < 0) { 2443764e82eSJohannes Thumshirn pr_err("Failed registering device 16z%03d on bus mcb%d (%d)\n", 2453764e82eSJohannes Thumshirn device_id, bus->bus_nr, ret); 2463764e82eSJohannes Thumshirn goto out; 2473764e82eSJohannes Thumshirn } 2483764e82eSJohannes Thumshirn 2493764e82eSJohannes Thumshirn return 0; 2503764e82eSJohannes Thumshirn 2513764e82eSJohannes Thumshirn out: 2523764e82eSJohannes Thumshirn 2533764e82eSJohannes Thumshirn return ret; 2543764e82eSJohannes Thumshirn } 2553764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_device_register); 2563764e82eSJohannes Thumshirn 2575d9e2ab9SJohannes Thumshirn static void mcb_free_bus(struct device *dev) 2585d9e2ab9SJohannes Thumshirn { 2595d9e2ab9SJohannes Thumshirn struct mcb_bus *bus = to_mcb_bus(dev); 2605d9e2ab9SJohannes Thumshirn 2615d9e2ab9SJohannes Thumshirn put_device(bus->carrier); 2625d9e2ab9SJohannes Thumshirn ida_simple_remove(&mcb_ida, bus->bus_nr); 2635d9e2ab9SJohannes Thumshirn kfree(bus); 2645d9e2ab9SJohannes Thumshirn } 2655d9e2ab9SJohannes Thumshirn 2663764e82eSJohannes Thumshirn /** 2673764e82eSJohannes Thumshirn * mcb_alloc_bus() - Allocate a new @mcb_bus 2683764e82eSJohannes Thumshirn * 2693764e82eSJohannes Thumshirn * Allocate a new @mcb_bus. 2703764e82eSJohannes Thumshirn */ 2714ec65b77SJohannes Thumshirn struct mcb_bus *mcb_alloc_bus(struct device *carrier) 2723764e82eSJohannes Thumshirn { 2733764e82eSJohannes Thumshirn struct mcb_bus *bus; 2743764e82eSJohannes Thumshirn int bus_nr; 27518d28819SJohannes Thumshirn int rc; 2763764e82eSJohannes Thumshirn 2773764e82eSJohannes Thumshirn bus = kzalloc(sizeof(struct mcb_bus), GFP_KERNEL); 2783764e82eSJohannes Thumshirn if (!bus) 2794ec65b77SJohannes Thumshirn return ERR_PTR(-ENOMEM); 2803764e82eSJohannes Thumshirn 2813764e82eSJohannes Thumshirn bus_nr = ida_simple_get(&mcb_ida, 0, 0, GFP_KERNEL); 2823764e82eSJohannes Thumshirn if (bus_nr < 0) { 28318d28819SJohannes Thumshirn rc = bus_nr; 28418d28819SJohannes Thumshirn goto err_free; 2853764e82eSJohannes Thumshirn } 2863764e82eSJohannes Thumshirn 2873764e82eSJohannes Thumshirn bus->bus_nr = bus_nr; 2885d9e2ab9SJohannes Thumshirn bus->carrier = get_device(carrier); 28918d28819SJohannes Thumshirn 29018d28819SJohannes Thumshirn device_initialize(&bus->dev); 29118d28819SJohannes Thumshirn bus->dev.parent = carrier; 29218d28819SJohannes Thumshirn bus->dev.bus = &mcb_bus_type; 293803f1ca6SJohannes Thumshirn bus->dev.type = &mcb_carrier_device_type; 2945d9e2ab9SJohannes Thumshirn bus->dev.release = &mcb_free_bus; 29518d28819SJohannes Thumshirn 29618d28819SJohannes Thumshirn dev_set_name(&bus->dev, "mcb:%d", bus_nr); 29718d28819SJohannes Thumshirn rc = device_add(&bus->dev); 29818d28819SJohannes Thumshirn if (rc) 29918d28819SJohannes Thumshirn goto err_free; 30018d28819SJohannes Thumshirn 3013764e82eSJohannes Thumshirn return bus; 30218d28819SJohannes Thumshirn err_free: 3035d9e2ab9SJohannes Thumshirn put_device(carrier); 30418d28819SJohannes Thumshirn kfree(bus); 30518d28819SJohannes Thumshirn return ERR_PTR(rc); 3063764e82eSJohannes Thumshirn } 3073764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_alloc_bus); 3083764e82eSJohannes Thumshirn 3093764e82eSJohannes Thumshirn static int __mcb_devices_unregister(struct device *dev, void *data) 3103764e82eSJohannes Thumshirn { 3113764e82eSJohannes Thumshirn device_unregister(dev); 3123764e82eSJohannes Thumshirn return 0; 3133764e82eSJohannes Thumshirn } 3143764e82eSJohannes Thumshirn 3153764e82eSJohannes Thumshirn static void mcb_devices_unregister(struct mcb_bus *bus) 3163764e82eSJohannes Thumshirn { 3173764e82eSJohannes Thumshirn bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_devices_unregister); 3183764e82eSJohannes Thumshirn } 3193764e82eSJohannes Thumshirn /** 3203764e82eSJohannes Thumshirn * mcb_release_bus() - Free a @mcb_bus 3213764e82eSJohannes Thumshirn * @bus: The @mcb_bus to release 3223764e82eSJohannes Thumshirn * 3233764e82eSJohannes Thumshirn * Release an allocated @mcb_bus from the system. 3243764e82eSJohannes Thumshirn */ 3253764e82eSJohannes Thumshirn void mcb_release_bus(struct mcb_bus *bus) 3263764e82eSJohannes Thumshirn { 3273764e82eSJohannes Thumshirn mcb_devices_unregister(bus); 3283764e82eSJohannes Thumshirn } 3293764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_release_bus); 3303764e82eSJohannes Thumshirn 3313764e82eSJohannes Thumshirn /** 3323764e82eSJohannes Thumshirn * mcb_bus_put() - Increment refcnt 3333764e82eSJohannes Thumshirn * @bus: The @mcb_bus 3343764e82eSJohannes Thumshirn * 3353764e82eSJohannes Thumshirn * Get a @mcb_bus' ref 3363764e82eSJohannes Thumshirn */ 3373764e82eSJohannes Thumshirn struct mcb_bus *mcb_bus_get(struct mcb_bus *bus) 3383764e82eSJohannes Thumshirn { 3393764e82eSJohannes Thumshirn if (bus) 3403764e82eSJohannes Thumshirn get_device(&bus->dev); 3413764e82eSJohannes Thumshirn 3423764e82eSJohannes Thumshirn return bus; 3433764e82eSJohannes Thumshirn } 3443764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_bus_get); 3453764e82eSJohannes Thumshirn 3463764e82eSJohannes Thumshirn /** 3473764e82eSJohannes Thumshirn * mcb_bus_put() - Decrement refcnt 3483764e82eSJohannes Thumshirn * @bus: The @mcb_bus 3493764e82eSJohannes Thumshirn * 3503764e82eSJohannes Thumshirn * Release a @mcb_bus' ref 3513764e82eSJohannes Thumshirn */ 3523764e82eSJohannes Thumshirn void mcb_bus_put(struct mcb_bus *bus) 3533764e82eSJohannes Thumshirn { 3543764e82eSJohannes Thumshirn if (bus) 3553764e82eSJohannes Thumshirn put_device(&bus->dev); 3563764e82eSJohannes Thumshirn } 3573764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_bus_put); 3583764e82eSJohannes Thumshirn 3593764e82eSJohannes Thumshirn /** 3603764e82eSJohannes Thumshirn * mcb_alloc_dev() - Allocate a device 3613764e82eSJohannes Thumshirn * @bus: The @mcb_bus the device is part of 3623764e82eSJohannes Thumshirn * 3633764e82eSJohannes Thumshirn * Allocate a @mcb_device and add bus. 3643764e82eSJohannes Thumshirn */ 3653764e82eSJohannes Thumshirn struct mcb_device *mcb_alloc_dev(struct mcb_bus *bus) 3663764e82eSJohannes Thumshirn { 3673764e82eSJohannes Thumshirn struct mcb_device *dev; 3683764e82eSJohannes Thumshirn 3693764e82eSJohannes Thumshirn dev = kzalloc(sizeof(struct mcb_device), GFP_KERNEL); 3703764e82eSJohannes Thumshirn if (!dev) 3713764e82eSJohannes Thumshirn return NULL; 3723764e82eSJohannes Thumshirn 3733764e82eSJohannes Thumshirn dev->bus = bus; 3743764e82eSJohannes Thumshirn 3753764e82eSJohannes Thumshirn return dev; 3763764e82eSJohannes Thumshirn } 3773764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_alloc_dev); 3783764e82eSJohannes Thumshirn 3793764e82eSJohannes Thumshirn /** 3803764e82eSJohannes Thumshirn * mcb_free_dev() - Free @mcb_device 3813764e82eSJohannes Thumshirn * @dev: The device to free 3823764e82eSJohannes Thumshirn * 3833764e82eSJohannes Thumshirn * Free a @mcb_device 3843764e82eSJohannes Thumshirn */ 3853764e82eSJohannes Thumshirn void mcb_free_dev(struct mcb_device *dev) 3863764e82eSJohannes Thumshirn { 3873764e82eSJohannes Thumshirn kfree(dev); 3883764e82eSJohannes Thumshirn } 3893764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_free_dev); 3903764e82eSJohannes Thumshirn 3913764e82eSJohannes Thumshirn static int __mcb_bus_add_devices(struct device *dev, void *data) 3923764e82eSJohannes Thumshirn { 3933764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 3943764e82eSJohannes Thumshirn int retval; 3953764e82eSJohannes Thumshirn 3963764e82eSJohannes Thumshirn if (mdev->is_added) 3973764e82eSJohannes Thumshirn return 0; 3983764e82eSJohannes Thumshirn 3993764e82eSJohannes Thumshirn retval = device_attach(dev); 4003764e82eSJohannes Thumshirn if (retval < 0) 4013764e82eSJohannes Thumshirn dev_err(dev, "Error adding device (%d)\n", retval); 4023764e82eSJohannes Thumshirn 4033764e82eSJohannes Thumshirn mdev->is_added = true; 4043764e82eSJohannes Thumshirn 4053764e82eSJohannes Thumshirn return 0; 4063764e82eSJohannes Thumshirn } 4073764e82eSJohannes Thumshirn 4083764e82eSJohannes Thumshirn /** 4093764e82eSJohannes Thumshirn * mcb_bus_add_devices() - Add devices in the bus' internal device list 4103764e82eSJohannes Thumshirn * @bus: The @mcb_bus we add the devices 4113764e82eSJohannes Thumshirn * 4123764e82eSJohannes Thumshirn * Add devices in the bus' internal device list to the system. 4133764e82eSJohannes Thumshirn */ 4143764e82eSJohannes Thumshirn void mcb_bus_add_devices(const struct mcb_bus *bus) 4153764e82eSJohannes Thumshirn { 4163764e82eSJohannes Thumshirn bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_bus_add_devices); 4173764e82eSJohannes Thumshirn } 4183764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_bus_add_devices); 4193764e82eSJohannes Thumshirn 4203764e82eSJohannes Thumshirn /** 421*2ce80087SJohannes Thumshirn * mcb_get_resource() - get a resource for a mcb device 422*2ce80087SJohannes Thumshirn * @dev: the mcb device 423*2ce80087SJohannes Thumshirn * @type: the type of resource 424*2ce80087SJohannes Thumshirn */ 425*2ce80087SJohannes Thumshirn struct resource *mcb_get_resource(struct mcb_device *dev, unsigned int type) 426*2ce80087SJohannes Thumshirn { 427*2ce80087SJohannes Thumshirn if (type == IORESOURCE_MEM) 428*2ce80087SJohannes Thumshirn return &dev->mem; 429*2ce80087SJohannes Thumshirn else if (type == IORESOURCE_IRQ) 430*2ce80087SJohannes Thumshirn return &dev->irq; 431*2ce80087SJohannes Thumshirn else 432*2ce80087SJohannes Thumshirn return NULL; 433*2ce80087SJohannes Thumshirn } 434*2ce80087SJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_get_resource); 435*2ce80087SJohannes Thumshirn 436*2ce80087SJohannes Thumshirn /** 4373764e82eSJohannes Thumshirn * mcb_request_mem() - Request memory 4383764e82eSJohannes Thumshirn * @dev: The @mcb_device the memory is for 4393764e82eSJohannes Thumshirn * @name: The name for the memory reference. 4403764e82eSJohannes Thumshirn * 4413764e82eSJohannes Thumshirn * Request memory for a @mcb_device. If @name is NULL the driver name will 4423764e82eSJohannes Thumshirn * be used. 4433764e82eSJohannes Thumshirn */ 4443764e82eSJohannes Thumshirn struct resource *mcb_request_mem(struct mcb_device *dev, const char *name) 4453764e82eSJohannes Thumshirn { 4463764e82eSJohannes Thumshirn struct resource *mem; 4473764e82eSJohannes Thumshirn u32 size; 4483764e82eSJohannes Thumshirn 4493764e82eSJohannes Thumshirn if (!name) 4503764e82eSJohannes Thumshirn name = dev->dev.driver->name; 4513764e82eSJohannes Thumshirn 4523764e82eSJohannes Thumshirn size = resource_size(&dev->mem); 4533764e82eSJohannes Thumshirn 4543764e82eSJohannes Thumshirn mem = request_mem_region(dev->mem.start, size, name); 4553764e82eSJohannes Thumshirn if (!mem) 4563764e82eSJohannes Thumshirn return ERR_PTR(-EBUSY); 4573764e82eSJohannes Thumshirn 4583764e82eSJohannes Thumshirn return mem; 4593764e82eSJohannes Thumshirn } 4603764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_request_mem); 4613764e82eSJohannes Thumshirn 4623764e82eSJohannes Thumshirn /** 4633764e82eSJohannes Thumshirn * mcb_release_mem() - Release memory requested by device 4643764e82eSJohannes Thumshirn * @dev: The @mcb_device that requested the memory 4653764e82eSJohannes Thumshirn * 4663764e82eSJohannes Thumshirn * Release memory that was prior requested via @mcb_request_mem(). 4673764e82eSJohannes Thumshirn */ 4683764e82eSJohannes Thumshirn void mcb_release_mem(struct resource *mem) 4693764e82eSJohannes Thumshirn { 4703764e82eSJohannes Thumshirn u32 size; 4713764e82eSJohannes Thumshirn 4723764e82eSJohannes Thumshirn size = resource_size(mem); 4733764e82eSJohannes Thumshirn release_mem_region(mem->start, size); 4743764e82eSJohannes Thumshirn } 4753764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_release_mem); 4763764e82eSJohannes Thumshirn 4774ec65b77SJohannes Thumshirn static int __mcb_get_irq(struct mcb_device *dev) 4784ec65b77SJohannes Thumshirn { 479*2ce80087SJohannes Thumshirn struct resource *irq; 480*2ce80087SJohannes Thumshirn 481*2ce80087SJohannes Thumshirn irq = mcb_get_resource(dev, IORESOURCE_IRQ); 4824ec65b77SJohannes Thumshirn 4834ec65b77SJohannes Thumshirn return irq->start; 4844ec65b77SJohannes Thumshirn } 4854ec65b77SJohannes Thumshirn 4863764e82eSJohannes Thumshirn /** 4873764e82eSJohannes Thumshirn * mcb_get_irq() - Get device's IRQ number 4883764e82eSJohannes Thumshirn * @dev: The @mcb_device the IRQ is for 4893764e82eSJohannes Thumshirn * 4903764e82eSJohannes Thumshirn * Get the IRQ number of a given @mcb_device. 4913764e82eSJohannes Thumshirn */ 4923764e82eSJohannes Thumshirn int mcb_get_irq(struct mcb_device *dev) 4933764e82eSJohannes Thumshirn { 4944ec65b77SJohannes Thumshirn struct mcb_bus *bus = dev->bus; 4953764e82eSJohannes Thumshirn 4964ec65b77SJohannes Thumshirn if (bus->get_irq) 4974ec65b77SJohannes Thumshirn return bus->get_irq(dev); 4984ec65b77SJohannes Thumshirn 4994ec65b77SJohannes Thumshirn return __mcb_get_irq(dev); 5003764e82eSJohannes Thumshirn } 5013764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_get_irq); 5023764e82eSJohannes Thumshirn 5033764e82eSJohannes Thumshirn static int mcb_init(void) 5043764e82eSJohannes Thumshirn { 5053764e82eSJohannes Thumshirn return bus_register(&mcb_bus_type); 5063764e82eSJohannes Thumshirn } 5073764e82eSJohannes Thumshirn 5083764e82eSJohannes Thumshirn static void mcb_exit(void) 5093764e82eSJohannes Thumshirn { 510169883a6SJohannes Thumshirn ida_destroy(&mcb_ida); 5113764e82eSJohannes Thumshirn bus_unregister(&mcb_bus_type); 5123764e82eSJohannes Thumshirn } 5133764e82eSJohannes Thumshirn 5143764e82eSJohannes Thumshirn /* mcb must be initialized after PCI but before the chameleon drivers. 5153764e82eSJohannes Thumshirn * That means we must use some initcall between subsys_initcall and 5163764e82eSJohannes Thumshirn * device_initcall. 5173764e82eSJohannes Thumshirn */ 5183764e82eSJohannes Thumshirn fs_initcall(mcb_init); 5193764e82eSJohannes Thumshirn module_exit(mcb_exit); 5203764e82eSJohannes Thumshirn 5213764e82eSJohannes Thumshirn MODULE_DESCRIPTION("MEN Chameleon Bus Driver"); 5223764e82eSJohannes Thumshirn MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>"); 5233764e82eSJohannes Thumshirn MODULE_LICENSE("GPL v2"); 524