1*3764e82eSJohannes Thumshirn /* 2*3764e82eSJohannes Thumshirn * MEN Chameleon Bus. 3*3764e82eSJohannes Thumshirn * 4*3764e82eSJohannes Thumshirn * Copyright (C) 2013 MEN Mikroelektronik GmbH (www.men.de) 5*3764e82eSJohannes Thumshirn * Author: Johannes Thumshirn <johannes.thumshirn@men.de> 6*3764e82eSJohannes Thumshirn * 7*3764e82eSJohannes Thumshirn * This program is free software; you can redistribute it and/or modify it 8*3764e82eSJohannes Thumshirn * under the terms of the GNU General Public License as published by the Free 9*3764e82eSJohannes Thumshirn * Software Foundation; version 2 of the License. 10*3764e82eSJohannes Thumshirn */ 11*3764e82eSJohannes Thumshirn #include <linux/kernel.h> 12*3764e82eSJohannes Thumshirn #include <linux/module.h> 13*3764e82eSJohannes Thumshirn #include <linux/slab.h> 14*3764e82eSJohannes Thumshirn #include <linux/types.h> 15*3764e82eSJohannes Thumshirn #include <linux/idr.h> 16*3764e82eSJohannes Thumshirn #include <linux/mcb.h> 17*3764e82eSJohannes Thumshirn 18*3764e82eSJohannes Thumshirn static DEFINE_IDA(mcb_ida); 19*3764e82eSJohannes Thumshirn 20*3764e82eSJohannes Thumshirn static const struct mcb_device_id *mcb_match_id(const struct mcb_device_id *ids, 21*3764e82eSJohannes Thumshirn struct mcb_device *dev) 22*3764e82eSJohannes Thumshirn { 23*3764e82eSJohannes Thumshirn if (ids) { 24*3764e82eSJohannes Thumshirn while (ids->device) { 25*3764e82eSJohannes Thumshirn if (ids->device == dev->id) 26*3764e82eSJohannes Thumshirn return ids; 27*3764e82eSJohannes Thumshirn ids++; 28*3764e82eSJohannes Thumshirn } 29*3764e82eSJohannes Thumshirn } 30*3764e82eSJohannes Thumshirn 31*3764e82eSJohannes Thumshirn return NULL; 32*3764e82eSJohannes Thumshirn } 33*3764e82eSJohannes Thumshirn 34*3764e82eSJohannes Thumshirn static int mcb_match(struct device *dev, struct device_driver *drv) 35*3764e82eSJohannes Thumshirn { 36*3764e82eSJohannes Thumshirn struct mcb_driver *mdrv = to_mcb_driver(drv); 37*3764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 38*3764e82eSJohannes Thumshirn const struct mcb_device_id *found_id; 39*3764e82eSJohannes Thumshirn 40*3764e82eSJohannes Thumshirn found_id = mcb_match_id(mdrv->id_table, mdev); 41*3764e82eSJohannes Thumshirn if (found_id) 42*3764e82eSJohannes Thumshirn return 1; 43*3764e82eSJohannes Thumshirn 44*3764e82eSJohannes Thumshirn return 0; 45*3764e82eSJohannes Thumshirn } 46*3764e82eSJohannes Thumshirn 47*3764e82eSJohannes Thumshirn static int mcb_uevent(struct device *dev, struct kobj_uevent_env *env) 48*3764e82eSJohannes Thumshirn { 49*3764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 50*3764e82eSJohannes Thumshirn int ret; 51*3764e82eSJohannes Thumshirn 52*3764e82eSJohannes Thumshirn ret = add_uevent_var(env, "MODALIAS=mcb:16z%03d", mdev->id); 53*3764e82eSJohannes Thumshirn if (ret) 54*3764e82eSJohannes Thumshirn return -ENOMEM; 55*3764e82eSJohannes Thumshirn 56*3764e82eSJohannes Thumshirn return 0; 57*3764e82eSJohannes Thumshirn } 58*3764e82eSJohannes Thumshirn 59*3764e82eSJohannes Thumshirn static int mcb_probe(struct device *dev) 60*3764e82eSJohannes Thumshirn { 61*3764e82eSJohannes Thumshirn struct mcb_driver *mdrv = to_mcb_driver(dev->driver); 62*3764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 63*3764e82eSJohannes Thumshirn const struct mcb_device_id *found_id; 64*3764e82eSJohannes Thumshirn 65*3764e82eSJohannes Thumshirn found_id = mcb_match_id(mdrv->id_table, mdev); 66*3764e82eSJohannes Thumshirn if (!found_id) 67*3764e82eSJohannes Thumshirn return -ENODEV; 68*3764e82eSJohannes Thumshirn 69*3764e82eSJohannes Thumshirn return mdrv->probe(mdev, found_id); 70*3764e82eSJohannes Thumshirn } 71*3764e82eSJohannes Thumshirn 72*3764e82eSJohannes Thumshirn static int mcb_remove(struct device *dev) 73*3764e82eSJohannes Thumshirn { 74*3764e82eSJohannes Thumshirn struct mcb_driver *mdrv = to_mcb_driver(dev->driver); 75*3764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 76*3764e82eSJohannes Thumshirn 77*3764e82eSJohannes Thumshirn mdrv->remove(mdev); 78*3764e82eSJohannes Thumshirn 79*3764e82eSJohannes Thumshirn put_device(&mdev->dev); 80*3764e82eSJohannes Thumshirn 81*3764e82eSJohannes Thumshirn return 0; 82*3764e82eSJohannes Thumshirn } 83*3764e82eSJohannes Thumshirn 84*3764e82eSJohannes Thumshirn static void mcb_shutdown(struct device *dev) 85*3764e82eSJohannes Thumshirn { 86*3764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 87*3764e82eSJohannes Thumshirn struct mcb_driver *mdrv = mdev->driver; 88*3764e82eSJohannes Thumshirn 89*3764e82eSJohannes Thumshirn if (mdrv && mdrv->shutdown) 90*3764e82eSJohannes Thumshirn mdrv->shutdown(mdev); 91*3764e82eSJohannes Thumshirn } 92*3764e82eSJohannes Thumshirn 93*3764e82eSJohannes Thumshirn static struct bus_type mcb_bus_type = { 94*3764e82eSJohannes Thumshirn .name = "mcb", 95*3764e82eSJohannes Thumshirn .match = mcb_match, 96*3764e82eSJohannes Thumshirn .uevent = mcb_uevent, 97*3764e82eSJohannes Thumshirn .probe = mcb_probe, 98*3764e82eSJohannes Thumshirn .remove = mcb_remove, 99*3764e82eSJohannes Thumshirn .shutdown = mcb_shutdown, 100*3764e82eSJohannes Thumshirn }; 101*3764e82eSJohannes Thumshirn 102*3764e82eSJohannes Thumshirn /** 103*3764e82eSJohannes Thumshirn * __mcb_register_driver() - Register a @mcb_driver at the system 104*3764e82eSJohannes Thumshirn * @drv: The @mcb_driver 105*3764e82eSJohannes Thumshirn * @owner: The @mcb_driver's module 106*3764e82eSJohannes Thumshirn * @mod_name: The name of the @mcb_driver's module 107*3764e82eSJohannes Thumshirn * 108*3764e82eSJohannes Thumshirn * Register a @mcb_driver at the system. Perform some sanity checks, if 109*3764e82eSJohannes Thumshirn * the .probe and .remove methods are provided by the driver. 110*3764e82eSJohannes Thumshirn */ 111*3764e82eSJohannes Thumshirn int __mcb_register_driver(struct mcb_driver *drv, struct module *owner, 112*3764e82eSJohannes Thumshirn const char *mod_name) 113*3764e82eSJohannes Thumshirn { 114*3764e82eSJohannes Thumshirn if (!drv->probe || !drv->remove) 115*3764e82eSJohannes Thumshirn return -EINVAL; 116*3764e82eSJohannes Thumshirn 117*3764e82eSJohannes Thumshirn drv->driver.owner = owner; 118*3764e82eSJohannes Thumshirn drv->driver.bus = &mcb_bus_type; 119*3764e82eSJohannes Thumshirn drv->driver.mod_name = mod_name; 120*3764e82eSJohannes Thumshirn 121*3764e82eSJohannes Thumshirn return driver_register(&drv->driver); 122*3764e82eSJohannes Thumshirn } 123*3764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(__mcb_register_driver); 124*3764e82eSJohannes Thumshirn 125*3764e82eSJohannes Thumshirn /** 126*3764e82eSJohannes Thumshirn * mcb_unregister_driver() - Unregister a @mcb_driver from the system 127*3764e82eSJohannes Thumshirn * @drv: The @mcb_driver 128*3764e82eSJohannes Thumshirn * 129*3764e82eSJohannes Thumshirn * Unregister a @mcb_driver from the system. 130*3764e82eSJohannes Thumshirn */ 131*3764e82eSJohannes Thumshirn void mcb_unregister_driver(struct mcb_driver *drv) 132*3764e82eSJohannes Thumshirn { 133*3764e82eSJohannes Thumshirn driver_unregister(&drv->driver); 134*3764e82eSJohannes Thumshirn } 135*3764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_unregister_driver); 136*3764e82eSJohannes Thumshirn 137*3764e82eSJohannes Thumshirn static void mcb_release_dev(struct device *dev) 138*3764e82eSJohannes Thumshirn { 139*3764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 140*3764e82eSJohannes Thumshirn 141*3764e82eSJohannes Thumshirn mcb_bus_put(mdev->bus); 142*3764e82eSJohannes Thumshirn kfree(mdev); 143*3764e82eSJohannes Thumshirn } 144*3764e82eSJohannes Thumshirn 145*3764e82eSJohannes Thumshirn /** 146*3764e82eSJohannes Thumshirn * mcb_device_register() - Register a mcb_device 147*3764e82eSJohannes Thumshirn * @bus: The @mcb_bus of the device 148*3764e82eSJohannes Thumshirn * @dev: The @mcb_device 149*3764e82eSJohannes Thumshirn * 150*3764e82eSJohannes Thumshirn * Register a specific @mcb_device at a @mcb_bus and the system itself. 151*3764e82eSJohannes Thumshirn */ 152*3764e82eSJohannes Thumshirn int mcb_device_register(struct mcb_bus *bus, struct mcb_device *dev) 153*3764e82eSJohannes Thumshirn { 154*3764e82eSJohannes Thumshirn int ret; 155*3764e82eSJohannes Thumshirn int device_id; 156*3764e82eSJohannes Thumshirn 157*3764e82eSJohannes Thumshirn device_initialize(&dev->dev); 158*3764e82eSJohannes Thumshirn dev->dev.bus = &mcb_bus_type; 159*3764e82eSJohannes Thumshirn dev->dev.parent = bus->dev.parent; 160*3764e82eSJohannes Thumshirn dev->dev.release = mcb_release_dev; 161*3764e82eSJohannes Thumshirn 162*3764e82eSJohannes Thumshirn device_id = dev->id; 163*3764e82eSJohannes Thumshirn dev_set_name(&dev->dev, "mcb%d-16z%03d-%d:%d:%d", 164*3764e82eSJohannes Thumshirn bus->bus_nr, device_id, dev->inst, dev->group, dev->var); 165*3764e82eSJohannes Thumshirn 166*3764e82eSJohannes Thumshirn ret = device_add(&dev->dev); 167*3764e82eSJohannes Thumshirn if (ret < 0) { 168*3764e82eSJohannes Thumshirn pr_err("Failed registering device 16z%03d on bus mcb%d (%d)\n", 169*3764e82eSJohannes Thumshirn device_id, bus->bus_nr, ret); 170*3764e82eSJohannes Thumshirn goto out; 171*3764e82eSJohannes Thumshirn } 172*3764e82eSJohannes Thumshirn 173*3764e82eSJohannes Thumshirn return 0; 174*3764e82eSJohannes Thumshirn 175*3764e82eSJohannes Thumshirn out: 176*3764e82eSJohannes Thumshirn 177*3764e82eSJohannes Thumshirn return ret; 178*3764e82eSJohannes Thumshirn } 179*3764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_device_register); 180*3764e82eSJohannes Thumshirn 181*3764e82eSJohannes Thumshirn /** 182*3764e82eSJohannes Thumshirn * mcb_alloc_bus() - Allocate a new @mcb_bus 183*3764e82eSJohannes Thumshirn * 184*3764e82eSJohannes Thumshirn * Allocate a new @mcb_bus. 185*3764e82eSJohannes Thumshirn */ 186*3764e82eSJohannes Thumshirn struct mcb_bus *mcb_alloc_bus(void) 187*3764e82eSJohannes Thumshirn { 188*3764e82eSJohannes Thumshirn struct mcb_bus *bus; 189*3764e82eSJohannes Thumshirn int bus_nr; 190*3764e82eSJohannes Thumshirn 191*3764e82eSJohannes Thumshirn bus = kzalloc(sizeof(struct mcb_bus), GFP_KERNEL); 192*3764e82eSJohannes Thumshirn if (!bus) 193*3764e82eSJohannes Thumshirn return NULL; 194*3764e82eSJohannes Thumshirn 195*3764e82eSJohannes Thumshirn bus_nr = ida_simple_get(&mcb_ida, 0, 0, GFP_KERNEL); 196*3764e82eSJohannes Thumshirn if (bus_nr < 0) { 197*3764e82eSJohannes Thumshirn kfree(bus); 198*3764e82eSJohannes Thumshirn return ERR_PTR(bus_nr); 199*3764e82eSJohannes Thumshirn } 200*3764e82eSJohannes Thumshirn 201*3764e82eSJohannes Thumshirn INIT_LIST_HEAD(&bus->children); 202*3764e82eSJohannes Thumshirn bus->bus_nr = bus_nr; 203*3764e82eSJohannes Thumshirn 204*3764e82eSJohannes Thumshirn return bus; 205*3764e82eSJohannes Thumshirn } 206*3764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_alloc_bus); 207*3764e82eSJohannes Thumshirn 208*3764e82eSJohannes Thumshirn static int __mcb_devices_unregister(struct device *dev, void *data) 209*3764e82eSJohannes Thumshirn { 210*3764e82eSJohannes Thumshirn device_unregister(dev); 211*3764e82eSJohannes Thumshirn return 0; 212*3764e82eSJohannes Thumshirn } 213*3764e82eSJohannes Thumshirn 214*3764e82eSJohannes Thumshirn static void mcb_devices_unregister(struct mcb_bus *bus) 215*3764e82eSJohannes Thumshirn { 216*3764e82eSJohannes Thumshirn bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_devices_unregister); 217*3764e82eSJohannes Thumshirn } 218*3764e82eSJohannes Thumshirn /** 219*3764e82eSJohannes Thumshirn * mcb_release_bus() - Free a @mcb_bus 220*3764e82eSJohannes Thumshirn * @bus: The @mcb_bus to release 221*3764e82eSJohannes Thumshirn * 222*3764e82eSJohannes Thumshirn * Release an allocated @mcb_bus from the system. 223*3764e82eSJohannes Thumshirn */ 224*3764e82eSJohannes Thumshirn void mcb_release_bus(struct mcb_bus *bus) 225*3764e82eSJohannes Thumshirn { 226*3764e82eSJohannes Thumshirn mcb_devices_unregister(bus); 227*3764e82eSJohannes Thumshirn 228*3764e82eSJohannes Thumshirn ida_simple_remove(&mcb_ida, bus->bus_nr); 229*3764e82eSJohannes Thumshirn 230*3764e82eSJohannes Thumshirn kfree(bus); 231*3764e82eSJohannes Thumshirn } 232*3764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_release_bus); 233*3764e82eSJohannes Thumshirn 234*3764e82eSJohannes Thumshirn /** 235*3764e82eSJohannes Thumshirn * mcb_bus_put() - Increment refcnt 236*3764e82eSJohannes Thumshirn * @bus: The @mcb_bus 237*3764e82eSJohannes Thumshirn * 238*3764e82eSJohannes Thumshirn * Get a @mcb_bus' ref 239*3764e82eSJohannes Thumshirn */ 240*3764e82eSJohannes Thumshirn struct mcb_bus *mcb_bus_get(struct mcb_bus *bus) 241*3764e82eSJohannes Thumshirn { 242*3764e82eSJohannes Thumshirn if (bus) 243*3764e82eSJohannes Thumshirn get_device(&bus->dev); 244*3764e82eSJohannes Thumshirn 245*3764e82eSJohannes Thumshirn return bus; 246*3764e82eSJohannes Thumshirn } 247*3764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_bus_get); 248*3764e82eSJohannes Thumshirn 249*3764e82eSJohannes Thumshirn /** 250*3764e82eSJohannes Thumshirn * mcb_bus_put() - Decrement refcnt 251*3764e82eSJohannes Thumshirn * @bus: The @mcb_bus 252*3764e82eSJohannes Thumshirn * 253*3764e82eSJohannes Thumshirn * Release a @mcb_bus' ref 254*3764e82eSJohannes Thumshirn */ 255*3764e82eSJohannes Thumshirn void mcb_bus_put(struct mcb_bus *bus) 256*3764e82eSJohannes Thumshirn { 257*3764e82eSJohannes Thumshirn if (bus) 258*3764e82eSJohannes Thumshirn put_device(&bus->dev); 259*3764e82eSJohannes Thumshirn } 260*3764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_bus_put); 261*3764e82eSJohannes Thumshirn 262*3764e82eSJohannes Thumshirn /** 263*3764e82eSJohannes Thumshirn * mcb_alloc_dev() - Allocate a device 264*3764e82eSJohannes Thumshirn * @bus: The @mcb_bus the device is part of 265*3764e82eSJohannes Thumshirn * 266*3764e82eSJohannes Thumshirn * Allocate a @mcb_device and add bus. 267*3764e82eSJohannes Thumshirn */ 268*3764e82eSJohannes Thumshirn struct mcb_device *mcb_alloc_dev(struct mcb_bus *bus) 269*3764e82eSJohannes Thumshirn { 270*3764e82eSJohannes Thumshirn struct mcb_device *dev; 271*3764e82eSJohannes Thumshirn 272*3764e82eSJohannes Thumshirn dev = kzalloc(sizeof(struct mcb_device), GFP_KERNEL); 273*3764e82eSJohannes Thumshirn if (!dev) 274*3764e82eSJohannes Thumshirn return NULL; 275*3764e82eSJohannes Thumshirn 276*3764e82eSJohannes Thumshirn INIT_LIST_HEAD(&dev->bus_list); 277*3764e82eSJohannes Thumshirn dev->bus = bus; 278*3764e82eSJohannes Thumshirn 279*3764e82eSJohannes Thumshirn return dev; 280*3764e82eSJohannes Thumshirn } 281*3764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_alloc_dev); 282*3764e82eSJohannes Thumshirn 283*3764e82eSJohannes Thumshirn /** 284*3764e82eSJohannes Thumshirn * mcb_free_dev() - Free @mcb_device 285*3764e82eSJohannes Thumshirn * @dev: The device to free 286*3764e82eSJohannes Thumshirn * 287*3764e82eSJohannes Thumshirn * Free a @mcb_device 288*3764e82eSJohannes Thumshirn */ 289*3764e82eSJohannes Thumshirn void mcb_free_dev(struct mcb_device *dev) 290*3764e82eSJohannes Thumshirn { 291*3764e82eSJohannes Thumshirn kfree(dev); 292*3764e82eSJohannes Thumshirn } 293*3764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_free_dev); 294*3764e82eSJohannes Thumshirn 295*3764e82eSJohannes Thumshirn static int __mcb_bus_add_devices(struct device *dev, void *data) 296*3764e82eSJohannes Thumshirn { 297*3764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 298*3764e82eSJohannes Thumshirn int retval; 299*3764e82eSJohannes Thumshirn 300*3764e82eSJohannes Thumshirn if (mdev->is_added) 301*3764e82eSJohannes Thumshirn return 0; 302*3764e82eSJohannes Thumshirn 303*3764e82eSJohannes Thumshirn retval = device_attach(dev); 304*3764e82eSJohannes Thumshirn if (retval < 0) 305*3764e82eSJohannes Thumshirn dev_err(dev, "Error adding device (%d)\n", retval); 306*3764e82eSJohannes Thumshirn 307*3764e82eSJohannes Thumshirn mdev->is_added = true; 308*3764e82eSJohannes Thumshirn 309*3764e82eSJohannes Thumshirn return 0; 310*3764e82eSJohannes Thumshirn } 311*3764e82eSJohannes Thumshirn 312*3764e82eSJohannes Thumshirn static int __mcb_bus_add_child(struct device *dev, void *data) 313*3764e82eSJohannes Thumshirn { 314*3764e82eSJohannes Thumshirn struct mcb_device *mdev = to_mcb_device(dev); 315*3764e82eSJohannes Thumshirn struct mcb_bus *child; 316*3764e82eSJohannes Thumshirn 317*3764e82eSJohannes Thumshirn BUG_ON(!mdev->is_added); 318*3764e82eSJohannes Thumshirn child = mdev->subordinate; 319*3764e82eSJohannes Thumshirn 320*3764e82eSJohannes Thumshirn if (child) 321*3764e82eSJohannes Thumshirn mcb_bus_add_devices(child); 322*3764e82eSJohannes Thumshirn 323*3764e82eSJohannes Thumshirn return 0; 324*3764e82eSJohannes Thumshirn } 325*3764e82eSJohannes Thumshirn 326*3764e82eSJohannes Thumshirn /** 327*3764e82eSJohannes Thumshirn * mcb_bus_add_devices() - Add devices in the bus' internal device list 328*3764e82eSJohannes Thumshirn * @bus: The @mcb_bus we add the devices 329*3764e82eSJohannes Thumshirn * 330*3764e82eSJohannes Thumshirn * Add devices in the bus' internal device list to the system. 331*3764e82eSJohannes Thumshirn */ 332*3764e82eSJohannes Thumshirn void mcb_bus_add_devices(const struct mcb_bus *bus) 333*3764e82eSJohannes Thumshirn { 334*3764e82eSJohannes Thumshirn bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_bus_add_devices); 335*3764e82eSJohannes Thumshirn bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_bus_add_child); 336*3764e82eSJohannes Thumshirn 337*3764e82eSJohannes Thumshirn } 338*3764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_bus_add_devices); 339*3764e82eSJohannes Thumshirn 340*3764e82eSJohannes Thumshirn /** 341*3764e82eSJohannes Thumshirn * mcb_request_mem() - Request memory 342*3764e82eSJohannes Thumshirn * @dev: The @mcb_device the memory is for 343*3764e82eSJohannes Thumshirn * @name: The name for the memory reference. 344*3764e82eSJohannes Thumshirn * 345*3764e82eSJohannes Thumshirn * Request memory for a @mcb_device. If @name is NULL the driver name will 346*3764e82eSJohannes Thumshirn * be used. 347*3764e82eSJohannes Thumshirn */ 348*3764e82eSJohannes Thumshirn struct resource *mcb_request_mem(struct mcb_device *dev, const char *name) 349*3764e82eSJohannes Thumshirn { 350*3764e82eSJohannes Thumshirn struct resource *mem; 351*3764e82eSJohannes Thumshirn u32 size; 352*3764e82eSJohannes Thumshirn 353*3764e82eSJohannes Thumshirn if (!name) 354*3764e82eSJohannes Thumshirn name = dev->dev.driver->name; 355*3764e82eSJohannes Thumshirn 356*3764e82eSJohannes Thumshirn size = resource_size(&dev->mem); 357*3764e82eSJohannes Thumshirn 358*3764e82eSJohannes Thumshirn mem = request_mem_region(dev->mem.start, size, name); 359*3764e82eSJohannes Thumshirn if (!mem) 360*3764e82eSJohannes Thumshirn return ERR_PTR(-EBUSY); 361*3764e82eSJohannes Thumshirn 362*3764e82eSJohannes Thumshirn return mem; 363*3764e82eSJohannes Thumshirn } 364*3764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_request_mem); 365*3764e82eSJohannes Thumshirn 366*3764e82eSJohannes Thumshirn /** 367*3764e82eSJohannes Thumshirn * mcb_release_mem() - Release memory requested by device 368*3764e82eSJohannes Thumshirn * @dev: The @mcb_device that requested the memory 369*3764e82eSJohannes Thumshirn * 370*3764e82eSJohannes Thumshirn * Release memory that was prior requested via @mcb_request_mem(). 371*3764e82eSJohannes Thumshirn */ 372*3764e82eSJohannes Thumshirn void mcb_release_mem(struct resource *mem) 373*3764e82eSJohannes Thumshirn { 374*3764e82eSJohannes Thumshirn u32 size; 375*3764e82eSJohannes Thumshirn 376*3764e82eSJohannes Thumshirn size = resource_size(mem); 377*3764e82eSJohannes Thumshirn release_mem_region(mem->start, size); 378*3764e82eSJohannes Thumshirn } 379*3764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_release_mem); 380*3764e82eSJohannes Thumshirn 381*3764e82eSJohannes Thumshirn /** 382*3764e82eSJohannes Thumshirn * mcb_get_irq() - Get device's IRQ number 383*3764e82eSJohannes Thumshirn * @dev: The @mcb_device the IRQ is for 384*3764e82eSJohannes Thumshirn * 385*3764e82eSJohannes Thumshirn * Get the IRQ number of a given @mcb_device. 386*3764e82eSJohannes Thumshirn */ 387*3764e82eSJohannes Thumshirn int mcb_get_irq(struct mcb_device *dev) 388*3764e82eSJohannes Thumshirn { 389*3764e82eSJohannes Thumshirn struct resource *irq = &dev->irq; 390*3764e82eSJohannes Thumshirn 391*3764e82eSJohannes Thumshirn return irq->start; 392*3764e82eSJohannes Thumshirn } 393*3764e82eSJohannes Thumshirn EXPORT_SYMBOL_GPL(mcb_get_irq); 394*3764e82eSJohannes Thumshirn 395*3764e82eSJohannes Thumshirn static int mcb_init(void) 396*3764e82eSJohannes Thumshirn { 397*3764e82eSJohannes Thumshirn return bus_register(&mcb_bus_type); 398*3764e82eSJohannes Thumshirn } 399*3764e82eSJohannes Thumshirn 400*3764e82eSJohannes Thumshirn static void mcb_exit(void) 401*3764e82eSJohannes Thumshirn { 402*3764e82eSJohannes Thumshirn bus_unregister(&mcb_bus_type); 403*3764e82eSJohannes Thumshirn } 404*3764e82eSJohannes Thumshirn 405*3764e82eSJohannes Thumshirn /* mcb must be initialized after PCI but before the chameleon drivers. 406*3764e82eSJohannes Thumshirn * That means we must use some initcall between subsys_initcall and 407*3764e82eSJohannes Thumshirn * device_initcall. 408*3764e82eSJohannes Thumshirn */ 409*3764e82eSJohannes Thumshirn fs_initcall(mcb_init); 410*3764e82eSJohannes Thumshirn module_exit(mcb_exit); 411*3764e82eSJohannes Thumshirn 412*3764e82eSJohannes Thumshirn MODULE_DESCRIPTION("MEN Chameleon Bus Driver"); 413*3764e82eSJohannes Thumshirn MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>"); 414*3764e82eSJohannes Thumshirn MODULE_LICENSE("GPL v2"); 415