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 { 86*5d9e2ab9SJohannes Thumshirn struct mcb_driver *mdrv = to_mcb_driver(dev->driver); 873764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 883764e82eSJohannes Thumshirn 893764e82eSJohannes Thumshirn if (mdrv && mdrv->shutdown) 903764e82eSJohannes Thumshirn mdrv->shutdown(mdev); 913764e82eSJohannes Thumshirn } 923764e82eSJohannes Thumshirn 93803f1ca6SJohannes Thumshirn static ssize_t revision_show(struct device *dev, struct device_attribute *attr, 94803f1ca6SJohannes Thumshirn char *buf) 95803f1ca6SJohannes Thumshirn { 96803f1ca6SJohannes Thumshirn struct mcb_bus *bus = to_mcb_bus(dev); 97803f1ca6SJohannes Thumshirn 98803f1ca6SJohannes Thumshirn return scnprintf(buf, PAGE_SIZE, "%d\n", bus->revision); 99803f1ca6SJohannes Thumshirn } 100803f1ca6SJohannes Thumshirn static DEVICE_ATTR_RO(revision); 101803f1ca6SJohannes Thumshirn 102803f1ca6SJohannes Thumshirn static ssize_t model_show(struct device *dev, struct device_attribute *attr, 103803f1ca6SJohannes Thumshirn char *buf) 104803f1ca6SJohannes Thumshirn { 105803f1ca6SJohannes Thumshirn struct mcb_bus *bus = to_mcb_bus(dev); 106803f1ca6SJohannes Thumshirn 107803f1ca6SJohannes Thumshirn return scnprintf(buf, PAGE_SIZE, "%c\n", bus->model); 108803f1ca6SJohannes Thumshirn } 109803f1ca6SJohannes Thumshirn static DEVICE_ATTR_RO(model); 110803f1ca6SJohannes Thumshirn 111803f1ca6SJohannes Thumshirn static ssize_t minor_show(struct device *dev, struct device_attribute *attr, 112803f1ca6SJohannes Thumshirn char *buf) 113803f1ca6SJohannes Thumshirn { 114803f1ca6SJohannes Thumshirn struct mcb_bus *bus = to_mcb_bus(dev); 115803f1ca6SJohannes Thumshirn 116803f1ca6SJohannes Thumshirn return scnprintf(buf, PAGE_SIZE, "%d\n", bus->minor); 117803f1ca6SJohannes Thumshirn } 118803f1ca6SJohannes Thumshirn static DEVICE_ATTR_RO(minor); 119803f1ca6SJohannes Thumshirn 120803f1ca6SJohannes Thumshirn static ssize_t name_show(struct device *dev, struct device_attribute *attr, 121803f1ca6SJohannes Thumshirn char *buf) 122803f1ca6SJohannes Thumshirn { 123803f1ca6SJohannes Thumshirn struct mcb_bus *bus = to_mcb_bus(dev); 124803f1ca6SJohannes Thumshirn 125803f1ca6SJohannes Thumshirn return scnprintf(buf, PAGE_SIZE, "%s\n", bus->name); 126803f1ca6SJohannes Thumshirn } 127803f1ca6SJohannes Thumshirn static DEVICE_ATTR_RO(name); 128803f1ca6SJohannes Thumshirn 129803f1ca6SJohannes Thumshirn static struct attribute *mcb_bus_attrs[] = { 130803f1ca6SJohannes Thumshirn &dev_attr_revision.attr, 131803f1ca6SJohannes Thumshirn &dev_attr_model.attr, 132803f1ca6SJohannes Thumshirn &dev_attr_minor.attr, 133803f1ca6SJohannes Thumshirn &dev_attr_name.attr, 134803f1ca6SJohannes Thumshirn NULL, 135803f1ca6SJohannes Thumshirn }; 136803f1ca6SJohannes Thumshirn 137803f1ca6SJohannes Thumshirn static const struct attribute_group mcb_carrier_group = { 138803f1ca6SJohannes Thumshirn .attrs = mcb_bus_attrs, 139803f1ca6SJohannes Thumshirn }; 140803f1ca6SJohannes Thumshirn 141803f1ca6SJohannes Thumshirn static const struct attribute_group *mcb_carrier_groups[] = { 142803f1ca6SJohannes Thumshirn &mcb_carrier_group, 143803f1ca6SJohannes Thumshirn NULL, 144803f1ca6SJohannes Thumshirn }; 145803f1ca6SJohannes Thumshirn 146803f1ca6SJohannes Thumshirn 1473764e82eSJohannes Thumshirn static struct bus_type mcb_bus_type = { 1483764e82eSJohannes Thumshirn .name = "mcb", 1493764e82eSJohannes Thumshirn .match = mcb_match, 1503764e82eSJohannes Thumshirn .uevent = mcb_uevent, 1513764e82eSJohannes Thumshirn .probe = mcb_probe, 1523764e82eSJohannes Thumshirn .remove = mcb_remove, 1533764e82eSJohannes Thumshirn .shutdown = mcb_shutdown, 1543764e82eSJohannes Thumshirn }; 1553764e82eSJohannes Thumshirn 156803f1ca6SJohannes Thumshirn static struct device_type mcb_carrier_device_type = { 157803f1ca6SJohannes Thumshirn .name = "mcb-carrier", 158803f1ca6SJohannes Thumshirn .groups = mcb_carrier_groups, 159803f1ca6SJohannes Thumshirn }; 160803f1ca6SJohannes Thumshirn 1613764e82eSJohannes Thumshirn /** 1623764e82eSJohannes Thumshirn * __mcb_register_driver() - Register a @mcb_driver at the system 1633764e82eSJohannes Thumshirn * @drv: The @mcb_driver 1643764e82eSJohannes Thumshirn * @owner: The @mcb_driver's module 1653764e82eSJohannes Thumshirn * @mod_name: The name of the @mcb_driver's module 1663764e82eSJohannes Thumshirn * 1673764e82eSJohannes Thumshirn * Register a @mcb_driver at the system. Perform some sanity checks, if 1683764e82eSJohannes Thumshirn * the .probe and .remove methods are provided by the driver. 1693764e82eSJohannes Thumshirn */ 1703764e82eSJohannes Thumshirn int __mcb_register_driver(struct mcb_driver *drv, struct module *owner, 1713764e82eSJohannes Thumshirn const char *mod_name) 1723764e82eSJohannes Thumshirn { 1733764e82eSJohannes Thumshirn if (!drv->probe || !drv->remove) 1743764e82eSJohannes Thumshirn return -EINVAL; 1753764e82eSJohannes Thumshirn 1763764e82eSJohannes Thumshirn drv->driver.owner = owner; 1773764e82eSJohannes Thumshirn drv->driver.bus = &mcb_bus_type; 1783764e82eSJohannes Thumshirn drv->driver.mod_name = mod_name; 1793764e82eSJohannes Thumshirn 1803764e82eSJohannes Thumshirn return driver_register(&drv->driver); 1813764e82eSJohannes Thumshirn } 1823764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(__mcb_register_driver); 1833764e82eSJohannes Thumshirn 1843764e82eSJohannes Thumshirn /** 1853764e82eSJohannes Thumshirn * mcb_unregister_driver() - Unregister a @mcb_driver from the system 1863764e82eSJohannes Thumshirn * @drv: The @mcb_driver 1873764e82eSJohannes Thumshirn * 1883764e82eSJohannes Thumshirn * Unregister a @mcb_driver from the system. 1893764e82eSJohannes Thumshirn */ 1903764e82eSJohannes Thumshirn void mcb_unregister_driver(struct mcb_driver *drv) 1913764e82eSJohannes Thumshirn { 1923764e82eSJohannes Thumshirn driver_unregister(&drv->driver); 1933764e82eSJohannes Thumshirn } 1943764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_unregister_driver); 1953764e82eSJohannes Thumshirn 1963764e82eSJohannes Thumshirn static void mcb_release_dev(struct device *dev) 1973764e82eSJohannes Thumshirn { 1983764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 1993764e82eSJohannes Thumshirn 2003764e82eSJohannes Thumshirn mcb_bus_put(mdev->bus); 2013764e82eSJohannes Thumshirn kfree(mdev); 2023764e82eSJohannes Thumshirn } 2033764e82eSJohannes Thumshirn 2043764e82eSJohannes Thumshirn /** 2053764e82eSJohannes Thumshirn * mcb_device_register() - Register a mcb_device 2063764e82eSJohannes Thumshirn * @bus: The @mcb_bus of the device 2073764e82eSJohannes Thumshirn * @dev: The @mcb_device 2083764e82eSJohannes Thumshirn * 2093764e82eSJohannes Thumshirn * Register a specific @mcb_device at a @mcb_bus and the system itself. 2103764e82eSJohannes Thumshirn */ 2113764e82eSJohannes Thumshirn int mcb_device_register(struct mcb_bus *bus, struct mcb_device *dev) 2123764e82eSJohannes Thumshirn { 2133764e82eSJohannes Thumshirn int ret; 2143764e82eSJohannes Thumshirn int device_id; 2153764e82eSJohannes Thumshirn 2163764e82eSJohannes Thumshirn device_initialize(&dev->dev); 217*5d9e2ab9SJohannes Thumshirn mcb_bus_get(bus); 2183764e82eSJohannes Thumshirn dev->dev.bus = &mcb_bus_type; 2193764e82eSJohannes Thumshirn dev->dev.parent = bus->dev.parent; 2203764e82eSJohannes Thumshirn dev->dev.release = mcb_release_dev; 2213764e82eSJohannes Thumshirn 2223764e82eSJohannes Thumshirn device_id = dev->id; 2233764e82eSJohannes Thumshirn dev_set_name(&dev->dev, "mcb%d-16z%03d-%d:%d:%d", 2243764e82eSJohannes Thumshirn bus->bus_nr, device_id, dev->inst, dev->group, dev->var); 2253764e82eSJohannes Thumshirn 2263764e82eSJohannes Thumshirn ret = device_add(&dev->dev); 2273764e82eSJohannes Thumshirn if (ret < 0) { 2283764e82eSJohannes Thumshirn pr_err("Failed registering device 16z%03d on bus mcb%d (%d)\n", 2293764e82eSJohannes Thumshirn device_id, bus->bus_nr, ret); 2303764e82eSJohannes Thumshirn goto out; 2313764e82eSJohannes Thumshirn } 2323764e82eSJohannes Thumshirn 2333764e82eSJohannes Thumshirn return 0; 2343764e82eSJohannes Thumshirn 2353764e82eSJohannes Thumshirn out: 2363764e82eSJohannes Thumshirn 2373764e82eSJohannes Thumshirn return ret; 2383764e82eSJohannes Thumshirn } 2393764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_device_register); 2403764e82eSJohannes Thumshirn 241*5d9e2ab9SJohannes Thumshirn static void mcb_free_bus(struct device *dev) 242*5d9e2ab9SJohannes Thumshirn { 243*5d9e2ab9SJohannes Thumshirn struct mcb_bus *bus = to_mcb_bus(dev); 244*5d9e2ab9SJohannes Thumshirn 245*5d9e2ab9SJohannes Thumshirn put_device(bus->carrier); 246*5d9e2ab9SJohannes Thumshirn ida_simple_remove(&mcb_ida, bus->bus_nr); 247*5d9e2ab9SJohannes Thumshirn kfree(bus); 248*5d9e2ab9SJohannes Thumshirn } 249*5d9e2ab9SJohannes Thumshirn 2503764e82eSJohannes Thumshirn /** 2513764e82eSJohannes Thumshirn * mcb_alloc_bus() - Allocate a new @mcb_bus 2523764e82eSJohannes Thumshirn * 2533764e82eSJohannes Thumshirn * Allocate a new @mcb_bus. 2543764e82eSJohannes Thumshirn */ 2554ec65b77SJohannes Thumshirn struct mcb_bus *mcb_alloc_bus(struct device *carrier) 2563764e82eSJohannes Thumshirn { 2573764e82eSJohannes Thumshirn struct mcb_bus *bus; 2583764e82eSJohannes Thumshirn int bus_nr; 25918d28819SJohannes Thumshirn int rc; 2603764e82eSJohannes Thumshirn 2613764e82eSJohannes Thumshirn bus = kzalloc(sizeof(struct mcb_bus), GFP_KERNEL); 2623764e82eSJohannes Thumshirn if (!bus) 2634ec65b77SJohannes Thumshirn return ERR_PTR(-ENOMEM); 2643764e82eSJohannes Thumshirn 2653764e82eSJohannes Thumshirn bus_nr = ida_simple_get(&mcb_ida, 0, 0, GFP_KERNEL); 2663764e82eSJohannes Thumshirn if (bus_nr < 0) { 26718d28819SJohannes Thumshirn rc = bus_nr; 26818d28819SJohannes Thumshirn goto err_free; 2693764e82eSJohannes Thumshirn } 2703764e82eSJohannes Thumshirn 2713764e82eSJohannes Thumshirn bus->bus_nr = bus_nr; 272*5d9e2ab9SJohannes Thumshirn bus->carrier = get_device(carrier); 27318d28819SJohannes Thumshirn 27418d28819SJohannes Thumshirn device_initialize(&bus->dev); 27518d28819SJohannes Thumshirn bus->dev.parent = carrier; 27618d28819SJohannes Thumshirn bus->dev.bus = &mcb_bus_type; 277803f1ca6SJohannes Thumshirn bus->dev.type = &mcb_carrier_device_type; 278*5d9e2ab9SJohannes Thumshirn bus->dev.release = &mcb_free_bus; 27918d28819SJohannes Thumshirn 28018d28819SJohannes Thumshirn dev_set_name(&bus->dev, "mcb:%d", bus_nr); 28118d28819SJohannes Thumshirn rc = device_add(&bus->dev); 28218d28819SJohannes Thumshirn if (rc) 28318d28819SJohannes Thumshirn goto err_free; 28418d28819SJohannes Thumshirn 2853764e82eSJohannes Thumshirn return bus; 28618d28819SJohannes Thumshirn err_free: 287*5d9e2ab9SJohannes Thumshirn put_device(carrier); 28818d28819SJohannes Thumshirn kfree(bus); 28918d28819SJohannes Thumshirn return ERR_PTR(rc); 2903764e82eSJohannes Thumshirn } 2913764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_alloc_bus); 2923764e82eSJohannes Thumshirn 2933764e82eSJohannes Thumshirn static int __mcb_devices_unregister(struct device *dev, void *data) 2943764e82eSJohannes Thumshirn { 2953764e82eSJohannes Thumshirn device_unregister(dev); 2963764e82eSJohannes Thumshirn return 0; 2973764e82eSJohannes Thumshirn } 2983764e82eSJohannes Thumshirn 2993764e82eSJohannes Thumshirn static void mcb_devices_unregister(struct mcb_bus *bus) 3003764e82eSJohannes Thumshirn { 3013764e82eSJohannes Thumshirn bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_devices_unregister); 3023764e82eSJohannes Thumshirn } 3033764e82eSJohannes Thumshirn /** 3043764e82eSJohannes Thumshirn * mcb_release_bus() - Free a @mcb_bus 3053764e82eSJohannes Thumshirn * @bus: The @mcb_bus to release 3063764e82eSJohannes Thumshirn * 3073764e82eSJohannes Thumshirn * Release an allocated @mcb_bus from the system. 3083764e82eSJohannes Thumshirn */ 3093764e82eSJohannes Thumshirn void mcb_release_bus(struct mcb_bus *bus) 3103764e82eSJohannes Thumshirn { 3113764e82eSJohannes Thumshirn mcb_devices_unregister(bus); 3123764e82eSJohannes Thumshirn } 3133764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_release_bus); 3143764e82eSJohannes Thumshirn 3153764e82eSJohannes Thumshirn /** 3163764e82eSJohannes Thumshirn * mcb_bus_put() - Increment refcnt 3173764e82eSJohannes Thumshirn * @bus: The @mcb_bus 3183764e82eSJohannes Thumshirn * 3193764e82eSJohannes Thumshirn * Get a @mcb_bus' ref 3203764e82eSJohannes Thumshirn */ 3213764e82eSJohannes Thumshirn struct mcb_bus *mcb_bus_get(struct mcb_bus *bus) 3223764e82eSJohannes Thumshirn { 3233764e82eSJohannes Thumshirn if (bus) 3243764e82eSJohannes Thumshirn get_device(&bus->dev); 3253764e82eSJohannes Thumshirn 3263764e82eSJohannes Thumshirn return bus; 3273764e82eSJohannes Thumshirn } 3283764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_bus_get); 3293764e82eSJohannes Thumshirn 3303764e82eSJohannes Thumshirn /** 3313764e82eSJohannes Thumshirn * mcb_bus_put() - Decrement refcnt 3323764e82eSJohannes Thumshirn * @bus: The @mcb_bus 3333764e82eSJohannes Thumshirn * 3343764e82eSJohannes Thumshirn * Release a @mcb_bus' ref 3353764e82eSJohannes Thumshirn */ 3363764e82eSJohannes Thumshirn void mcb_bus_put(struct mcb_bus *bus) 3373764e82eSJohannes Thumshirn { 3383764e82eSJohannes Thumshirn if (bus) 3393764e82eSJohannes Thumshirn put_device(&bus->dev); 3403764e82eSJohannes Thumshirn } 3413764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_bus_put); 3423764e82eSJohannes Thumshirn 3433764e82eSJohannes Thumshirn /** 3443764e82eSJohannes Thumshirn * mcb_alloc_dev() - Allocate a device 3453764e82eSJohannes Thumshirn * @bus: The @mcb_bus the device is part of 3463764e82eSJohannes Thumshirn * 3473764e82eSJohannes Thumshirn * Allocate a @mcb_device and add bus. 3483764e82eSJohannes Thumshirn */ 3493764e82eSJohannes Thumshirn struct mcb_device *mcb_alloc_dev(struct mcb_bus *bus) 3503764e82eSJohannes Thumshirn { 3513764e82eSJohannes Thumshirn struct mcb_device *dev; 3523764e82eSJohannes Thumshirn 3533764e82eSJohannes Thumshirn dev = kzalloc(sizeof(struct mcb_device), GFP_KERNEL); 3543764e82eSJohannes Thumshirn if (!dev) 3553764e82eSJohannes Thumshirn return NULL; 3563764e82eSJohannes Thumshirn 3573764e82eSJohannes Thumshirn INIT_LIST_HEAD(&dev->bus_list); 3583764e82eSJohannes Thumshirn dev->bus = bus; 3593764e82eSJohannes Thumshirn 3603764e82eSJohannes Thumshirn return dev; 3613764e82eSJohannes Thumshirn } 3623764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_alloc_dev); 3633764e82eSJohannes Thumshirn 3643764e82eSJohannes Thumshirn /** 3653764e82eSJohannes Thumshirn * mcb_free_dev() - Free @mcb_device 3663764e82eSJohannes Thumshirn * @dev: The device to free 3673764e82eSJohannes Thumshirn * 3683764e82eSJohannes Thumshirn * Free a @mcb_device 3693764e82eSJohannes Thumshirn */ 3703764e82eSJohannes Thumshirn void mcb_free_dev(struct mcb_device *dev) 3713764e82eSJohannes Thumshirn { 3723764e82eSJohannes Thumshirn kfree(dev); 3733764e82eSJohannes Thumshirn } 3743764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_free_dev); 3753764e82eSJohannes Thumshirn 3763764e82eSJohannes Thumshirn static int __mcb_bus_add_devices(struct device *dev, void *data) 3773764e82eSJohannes Thumshirn { 3783764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 3793764e82eSJohannes Thumshirn int retval; 3803764e82eSJohannes Thumshirn 3813764e82eSJohannes Thumshirn if (mdev->is_added) 3823764e82eSJohannes Thumshirn return 0; 3833764e82eSJohannes Thumshirn 3843764e82eSJohannes Thumshirn retval = device_attach(dev); 3853764e82eSJohannes Thumshirn if (retval < 0) 3863764e82eSJohannes Thumshirn dev_err(dev, "Error adding device (%d)\n", retval); 3873764e82eSJohannes Thumshirn 3883764e82eSJohannes Thumshirn mdev->is_added = true; 3893764e82eSJohannes Thumshirn 3903764e82eSJohannes Thumshirn return 0; 3913764e82eSJohannes Thumshirn } 3923764e82eSJohannes Thumshirn 3933764e82eSJohannes Thumshirn static int __mcb_bus_add_child(struct device *dev, void *data) 3943764e82eSJohannes Thumshirn { 3953764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 3963764e82eSJohannes Thumshirn struct mcb_bus *child; 3973764e82eSJohannes Thumshirn 3983764e82eSJohannes Thumshirn BUG_ON(!mdev->is_added); 3993764e82eSJohannes Thumshirn child = mdev->subordinate; 4003764e82eSJohannes Thumshirn 4013764e82eSJohannes Thumshirn if (child) 4023764e82eSJohannes Thumshirn mcb_bus_add_devices(child); 4033764e82eSJohannes Thumshirn 4043764e82eSJohannes Thumshirn return 0; 4053764e82eSJohannes Thumshirn } 4063764e82eSJohannes Thumshirn 4073764e82eSJohannes Thumshirn /** 4083764e82eSJohannes Thumshirn * mcb_bus_add_devices() - Add devices in the bus' internal device list 4093764e82eSJohannes Thumshirn * @bus: The @mcb_bus we add the devices 4103764e82eSJohannes Thumshirn * 4113764e82eSJohannes Thumshirn * Add devices in the bus' internal device list to the system. 4123764e82eSJohannes Thumshirn */ 4133764e82eSJohannes Thumshirn void mcb_bus_add_devices(const struct mcb_bus *bus) 4143764e82eSJohannes Thumshirn { 4153764e82eSJohannes Thumshirn bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_bus_add_devices); 4163764e82eSJohannes Thumshirn bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_bus_add_child); 4173764e82eSJohannes Thumshirn 4183764e82eSJohannes Thumshirn } 4193764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_bus_add_devices); 4203764e82eSJohannes Thumshirn 4213764e82eSJohannes Thumshirn /** 4223764e82eSJohannes Thumshirn * mcb_request_mem() - Request memory 4233764e82eSJohannes Thumshirn * @dev: The @mcb_device the memory is for 4243764e82eSJohannes Thumshirn * @name: The name for the memory reference. 4253764e82eSJohannes Thumshirn * 4263764e82eSJohannes Thumshirn * Request memory for a @mcb_device. If @name is NULL the driver name will 4273764e82eSJohannes Thumshirn * be used. 4283764e82eSJohannes Thumshirn */ 4293764e82eSJohannes Thumshirn struct resource *mcb_request_mem(struct mcb_device *dev, const char *name) 4303764e82eSJohannes Thumshirn { 4313764e82eSJohannes Thumshirn struct resource *mem; 4323764e82eSJohannes Thumshirn u32 size; 4333764e82eSJohannes Thumshirn 4343764e82eSJohannes Thumshirn if (!name) 4353764e82eSJohannes Thumshirn name = dev->dev.driver->name; 4363764e82eSJohannes Thumshirn 4373764e82eSJohannes Thumshirn size = resource_size(&dev->mem); 4383764e82eSJohannes Thumshirn 4393764e82eSJohannes Thumshirn mem = request_mem_region(dev->mem.start, size, name); 4403764e82eSJohannes Thumshirn if (!mem) 4413764e82eSJohannes Thumshirn return ERR_PTR(-EBUSY); 4423764e82eSJohannes Thumshirn 4433764e82eSJohannes Thumshirn return mem; 4443764e82eSJohannes Thumshirn } 4453764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_request_mem); 4463764e82eSJohannes Thumshirn 4473764e82eSJohannes Thumshirn /** 4483764e82eSJohannes Thumshirn * mcb_release_mem() - Release memory requested by device 4493764e82eSJohannes Thumshirn * @dev: The @mcb_device that requested the memory 4503764e82eSJohannes Thumshirn * 4513764e82eSJohannes Thumshirn * Release memory that was prior requested via @mcb_request_mem(). 4523764e82eSJohannes Thumshirn */ 4533764e82eSJohannes Thumshirn void mcb_release_mem(struct resource *mem) 4543764e82eSJohannes Thumshirn { 4553764e82eSJohannes Thumshirn u32 size; 4563764e82eSJohannes Thumshirn 4573764e82eSJohannes Thumshirn size = resource_size(mem); 4583764e82eSJohannes Thumshirn release_mem_region(mem->start, size); 4593764e82eSJohannes Thumshirn } 4603764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_release_mem); 4613764e82eSJohannes Thumshirn 4624ec65b77SJohannes Thumshirn static int __mcb_get_irq(struct mcb_device *dev) 4634ec65b77SJohannes Thumshirn { 4644ec65b77SJohannes Thumshirn struct resource *irq = &dev->irq; 4654ec65b77SJohannes Thumshirn 4664ec65b77SJohannes Thumshirn return irq->start; 4674ec65b77SJohannes Thumshirn } 4684ec65b77SJohannes Thumshirn 4693764e82eSJohannes Thumshirn /** 4703764e82eSJohannes Thumshirn * mcb_get_irq() - Get device's IRQ number 4713764e82eSJohannes Thumshirn * @dev: The @mcb_device the IRQ is for 4723764e82eSJohannes Thumshirn * 4733764e82eSJohannes Thumshirn * Get the IRQ number of a given @mcb_device. 4743764e82eSJohannes Thumshirn */ 4753764e82eSJohannes Thumshirn int mcb_get_irq(struct mcb_device *dev) 4763764e82eSJohannes Thumshirn { 4774ec65b77SJohannes Thumshirn struct mcb_bus *bus = dev->bus; 4783764e82eSJohannes Thumshirn 4794ec65b77SJohannes Thumshirn if (bus->get_irq) 4804ec65b77SJohannes Thumshirn return bus->get_irq(dev); 4814ec65b77SJohannes Thumshirn 4824ec65b77SJohannes Thumshirn return __mcb_get_irq(dev); 4833764e82eSJohannes Thumshirn } 4843764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_get_irq); 4853764e82eSJohannes Thumshirn 4863764e82eSJohannes Thumshirn static int mcb_init(void) 4873764e82eSJohannes Thumshirn { 4883764e82eSJohannes Thumshirn return bus_register(&mcb_bus_type); 4893764e82eSJohannes Thumshirn } 4903764e82eSJohannes Thumshirn 4913764e82eSJohannes Thumshirn static void mcb_exit(void) 4923764e82eSJohannes Thumshirn { 493169883a6SJohannes Thumshirn ida_destroy(&mcb_ida); 4943764e82eSJohannes Thumshirn bus_unregister(&mcb_bus_type); 4953764e82eSJohannes Thumshirn } 4963764e82eSJohannes Thumshirn 4973764e82eSJohannes Thumshirn /* mcb must be initialized after PCI but before the chameleon drivers. 4983764e82eSJohannes Thumshirn * That means we must use some initcall between subsys_initcall and 4993764e82eSJohannes Thumshirn * device_initcall. 5003764e82eSJohannes Thumshirn */ 5013764e82eSJohannes Thumshirn fs_initcall(mcb_init); 5023764e82eSJohannes Thumshirn module_exit(mcb_exit); 5033764e82eSJohannes Thumshirn 5043764e82eSJohannes Thumshirn MODULE_DESCRIPTION("MEN Chameleon Bus Driver"); 5053764e82eSJohannes Thumshirn MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>"); 5063764e82eSJohannes Thumshirn MODULE_LICENSE("GPL v2"); 507