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1/*
2 * MEN Chameleon Bus.
3 *
4 * Copyright (C) 2013 MEN Mikroelektronik GmbH (www.men.de)
5 * Author: Johannes Thumshirn <johannes.thumshirn@men.de>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; version 2 of the License.
10 */
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/slab.h>
14#include <linux/types.h>
15#include <linux/idr.h>
16#include <linux/mcb.h>
17
18static DEFINE_IDA(mcb_ida);
19
20static const struct mcb_device_id *mcb_match_id(const struct mcb_device_id *ids,
21 struct mcb_device *dev)
22{
23 if (ids) {
24 while (ids->device) {
25 if (ids->device == dev->id)
26 return ids;
27 ids++;
28 }
29 }
30
31 return NULL;
32}
33
34static int mcb_match(struct device *dev, struct device_driver *drv)
35{
36 struct mcb_driver *mdrv = to_mcb_driver(drv);
37 struct mcb_device *mdev = to_mcb_device(dev);
38 const struct mcb_device_id *found_id;
39
40 found_id = mcb_match_id(mdrv->id_table, mdev);
41 if (found_id)
42 return 1;
43
44 return 0;
45}
46
47static int mcb_uevent(struct device *dev, struct kobj_uevent_env *env)
48{
49 struct mcb_device *mdev = to_mcb_device(dev);
50 int ret;
51
52 ret = add_uevent_var(env, "MODALIAS=mcb:16z%03d", mdev->id);
53 if (ret)
54 return -ENOMEM;
55
56 return 0;
57}
58
59static int mcb_probe(struct device *dev)
60{
61 struct mcb_driver *mdrv = to_mcb_driver(dev->driver);
62 struct mcb_device *mdev = to_mcb_device(dev);
63 const struct mcb_device_id *found_id;
64
65 found_id = mcb_match_id(mdrv->id_table, mdev);
66 if (!found_id)
67 return -ENODEV;
68
69 return mdrv->probe(mdev, found_id);
70}
71
72static int mcb_remove(struct device *dev)
73{
74 struct mcb_driver *mdrv = to_mcb_driver(dev->driver);
75 struct mcb_device *mdev = to_mcb_device(dev);
76
77 mdrv->remove(mdev);
78
79 put_device(&mdev->dev);
80
81 return 0;
82}
83
84static void mcb_shutdown(struct device *dev)
85{
86 struct mcb_device *mdev = to_mcb_device(dev);
87 struct mcb_driver *mdrv = mdev->driver;
88
89 if (mdrv && mdrv->shutdown)
90 mdrv->shutdown(mdev);
91}
92
93static struct bus_type mcb_bus_type = {
94 .name = "mcb",
95 .match = mcb_match,
96 .uevent = mcb_uevent,
97 .probe = mcb_probe,
98 .remove = mcb_remove,
99 .shutdown = mcb_shutdown,
100};
101
102/**
103 * __mcb_register_driver() - Register a @mcb_driver at the system
104 * @drv: The @mcb_driver
105 * @owner: The @mcb_driver's module
106 * @mod_name: The name of the @mcb_driver's module
107 *
108 * Register a @mcb_driver at the system. Perform some sanity checks, if
109 * the .probe and .remove methods are provided by the driver.
110 */
111int __mcb_register_driver(struct mcb_driver *drv, struct module *owner,
112 const char *mod_name)
113{
114 if (!drv->probe || !drv->remove)
115 return -EINVAL;
116
117 drv->driver.owner = owner;
118 drv->driver.bus = &mcb_bus_type;
119 drv->driver.mod_name = mod_name;
120
121 return driver_register(&drv->driver);
122}
123EXPORT_SYMBOL_GPL(__mcb_register_driver);
124
125/**
126 * mcb_unregister_driver() - Unregister a @mcb_driver from the system
127 * @drv: The @mcb_driver
128 *
129 * Unregister a @mcb_driver from the system.
130 */
131void mcb_unregister_driver(struct mcb_driver *drv)
132{
133 driver_unregister(&drv->driver);
134}
135EXPORT_SYMBOL_GPL(mcb_unregister_driver);
136
137static void mcb_release_dev(struct device *dev)
138{
139 struct mcb_device *mdev = to_mcb_device(dev);
140
141 mcb_bus_put(mdev->bus);
142 kfree(mdev);
143}
144
145/**
146 * mcb_device_register() - Register a mcb_device
147 * @bus: The @mcb_bus of the device
148 * @dev: The @mcb_device
149 *
150 * Register a specific @mcb_device at a @mcb_bus and the system itself.
151 */
152int mcb_device_register(struct mcb_bus *bus, struct mcb_device *dev)
153{
154 int ret;
155 int device_id;
156
157 device_initialize(&dev->dev);
158 dev->dev.bus = &mcb_bus_type;
159 dev->dev.parent = bus->dev.parent;
160 dev->dev.release = mcb_release_dev;
161
162 device_id = dev->id;
163 dev_set_name(&dev->dev, "mcb%d-16z%03d-%d:%d:%d",
164 bus->bus_nr, device_id, dev->inst, dev->group, dev->var);
165
166 ret = device_add(&dev->dev);
167 if (ret < 0) {
168 pr_err("Failed registering device 16z%03d on bus mcb%d (%d)\n",
169 device_id, bus->bus_nr, ret);
170 goto out;
171 }
172
173 return 0;
174
175out:
176
177 return ret;
178}
179EXPORT_SYMBOL_GPL(mcb_device_register);
180
181/**
182 * mcb_alloc_bus() - Allocate a new @mcb_bus
183 *
184 * Allocate a new @mcb_bus.
185 */
186struct mcb_bus *mcb_alloc_bus(struct device *carrier)
187{
188 struct mcb_bus *bus;
189 int bus_nr;
190
191 bus = kzalloc(sizeof(struct mcb_bus), GFP_KERNEL);
192 if (!bus)
193 return ERR_PTR(-ENOMEM);
194
195 bus_nr = ida_simple_get(&mcb_ida, 0, 0, GFP_KERNEL);
196 if (bus_nr < 0) {
197 kfree(bus);
198 return ERR_PTR(bus_nr);
199 }
200
201 INIT_LIST_HEAD(&bus->children);
202 bus->bus_nr = bus_nr;
203 bus->carrier = carrier;
204 return bus;
205}
206EXPORT_SYMBOL_GPL(mcb_alloc_bus);
207
208static int __mcb_devices_unregister(struct device *dev, void *data)
209{
210 device_unregister(dev);
211 return 0;
212}
213
214static void mcb_devices_unregister(struct mcb_bus *bus)
215{
216 bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_devices_unregister);
217}
218/**
219 * mcb_release_bus() - Free a @mcb_bus
220 * @bus: The @mcb_bus to release
221 *
222 * Release an allocated @mcb_bus from the system.
223 */
224void mcb_release_bus(struct mcb_bus *bus)
225{
226 mcb_devices_unregister(bus);
227
228 ida_simple_remove(&mcb_ida, bus->bus_nr);
229
230 kfree(bus);
231}
232EXPORT_SYMBOL_GPL(mcb_release_bus);
233
234/**
235 * mcb_bus_put() - Increment refcnt
236 * @bus: The @mcb_bus
237 *
238 * Get a @mcb_bus' ref
239 */
240struct mcb_bus *mcb_bus_get(struct mcb_bus *bus)
241{
242 if (bus)
243 get_device(&bus->dev);
244
245 return bus;
246}
247EXPORT_SYMBOL_GPL(mcb_bus_get);
248
249/**
250 * mcb_bus_put() - Decrement refcnt
251 * @bus: The @mcb_bus
252 *
253 * Release a @mcb_bus' ref
254 */
255void mcb_bus_put(struct mcb_bus *bus)
256{
257 if (bus)
258 put_device(&bus->dev);
259}
260EXPORT_SYMBOL_GPL(mcb_bus_put);
261
262/**
263 * mcb_alloc_dev() - Allocate a device
264 * @bus: The @mcb_bus the device is part of
265 *
266 * Allocate a @mcb_device and add bus.
267 */
268struct mcb_device *mcb_alloc_dev(struct mcb_bus *bus)
269{
270 struct mcb_device *dev;
271
272 dev = kzalloc(sizeof(struct mcb_device), GFP_KERNEL);
273 if (!dev)
274 return NULL;
275
276 INIT_LIST_HEAD(&dev->bus_list);
277 dev->bus = bus;
278
279 return dev;
280}
281EXPORT_SYMBOL_GPL(mcb_alloc_dev);
282
283/**
284 * mcb_free_dev() - Free @mcb_device
285 * @dev: The device to free
286 *
287 * Free a @mcb_device
288 */
289void mcb_free_dev(struct mcb_device *dev)
290{
291 kfree(dev);
292}
293EXPORT_SYMBOL_GPL(mcb_free_dev);
294
295static int __mcb_bus_add_devices(struct device *dev, void *data)
296{
297 struct mcb_device *mdev = to_mcb_device(dev);
298 int retval;
299
300 if (mdev->is_added)
301 return 0;
302
303 retval = device_attach(dev);
304 if (retval < 0)
305 dev_err(dev, "Error adding device (%d)\n", retval);
306
307 mdev->is_added = true;
308
309 return 0;
310}
311
312static int __mcb_bus_add_child(struct device *dev, void *data)
313{
314 struct mcb_device *mdev = to_mcb_device(dev);
315 struct mcb_bus *child;
316
317 BUG_ON(!mdev->is_added);
318 child = mdev->subordinate;
319
320 if (child)
321 mcb_bus_add_devices(child);
322
323 return 0;
324}
325
326/**
327 * mcb_bus_add_devices() - Add devices in the bus' internal device list
328 * @bus: The @mcb_bus we add the devices
329 *
330 * Add devices in the bus' internal device list to the system.
331 */
332void mcb_bus_add_devices(const struct mcb_bus *bus)
333{
334 bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_bus_add_devices);
335 bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_bus_add_child);
336
337}
338EXPORT_SYMBOL_GPL(mcb_bus_add_devices);
339
340/**
341 * mcb_request_mem() - Request memory
342 * @dev: The @mcb_device the memory is for
343 * @name: The name for the memory reference.
344 *
345 * Request memory for a @mcb_device. If @name is NULL the driver name will
346 * be used.
347 */
348struct resource *mcb_request_mem(struct mcb_device *dev, const char *name)
349{
350 struct resource *mem;
351 u32 size;
352
353 if (!name)
354 name = dev->dev.driver->name;
355
356 size = resource_size(&dev->mem);
357
358 mem = request_mem_region(dev->mem.start, size, name);
359 if (!mem)
360 return ERR_PTR(-EBUSY);
361
362 return mem;
363}
364EXPORT_SYMBOL_GPL(mcb_request_mem);
365
366/**
367 * mcb_release_mem() - Release memory requested by device
368 * @dev: The @mcb_device that requested the memory
369 *
370 * Release memory that was prior requested via @mcb_request_mem().
371 */
372void mcb_release_mem(struct resource *mem)
373{
374 u32 size;
375
376 size = resource_size(mem);
377 release_mem_region(mem->start, size);
378}
379EXPORT_SYMBOL_GPL(mcb_release_mem);
380
381static int __mcb_get_irq(struct mcb_device *dev)
382{
383 struct resource *irq = &dev->irq;
384
385 return irq->start;
386}
387
388/**
389 * mcb_get_irq() - Get device's IRQ number
390 * @dev: The @mcb_device the IRQ is for
391 *
392 * Get the IRQ number of a given @mcb_device.
393 */
394int mcb_get_irq(struct mcb_device *dev)
395{
396 struct mcb_bus *bus = dev->bus;
397
398 if (bus->get_irq)
399 return bus->get_irq(dev);
400
401 return __mcb_get_irq(dev);
402}
403EXPORT_SYMBOL_GPL(mcb_get_irq);
404
405static int mcb_init(void)
406{
407 return bus_register(&mcb_bus_type);
408}
409
410static void mcb_exit(void)
411{
412 ida_destroy(&mcb_ida);
413 bus_unregister(&mcb_bus_type);
414}
415
416/* mcb must be initialized after PCI but before the chameleon drivers.
417 * That means we must use some initcall between subsys_initcall and
418 * device_initcall.
419 */
420fs_initcall(mcb_init);
421module_exit(mcb_exit);
422
423MODULE_DESCRIPTION("MEN Chameleon Bus Driver");
424MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
425MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * MEN Chameleon Bus.
4 *
5 * Copyright (C) 2013 MEN Mikroelektronik GmbH (www.men.de)
6 * Author: Johannes Thumshirn <johannes.thumshirn@men.de>
7 */
8#include <linux/kernel.h>
9#include <linux/module.h>
10#include <linux/slab.h>
11#include <linux/types.h>
12#include <linux/idr.h>
13#include <linux/mcb.h>
14
15static DEFINE_IDA(mcb_ida);
16
17static const struct mcb_device_id *mcb_match_id(const struct mcb_device_id *ids,
18 struct mcb_device *dev)
19{
20 if (ids) {
21 while (ids->device) {
22 if (ids->device == dev->id)
23 return ids;
24 ids++;
25 }
26 }
27
28 return NULL;
29}
30
31static int mcb_match(struct device *dev, struct device_driver *drv)
32{
33 struct mcb_driver *mdrv = to_mcb_driver(drv);
34 struct mcb_device *mdev = to_mcb_device(dev);
35 const struct mcb_device_id *found_id;
36
37 found_id = mcb_match_id(mdrv->id_table, mdev);
38 if (found_id)
39 return 1;
40
41 return 0;
42}
43
44static int mcb_uevent(struct device *dev, struct kobj_uevent_env *env)
45{
46 struct mcb_device *mdev = to_mcb_device(dev);
47 int ret;
48
49 ret = add_uevent_var(env, "MODALIAS=mcb:16z%03d", mdev->id);
50 if (ret)
51 return -ENOMEM;
52
53 return 0;
54}
55
56static int mcb_probe(struct device *dev)
57{
58 struct mcb_driver *mdrv = to_mcb_driver(dev->driver);
59 struct mcb_device *mdev = to_mcb_device(dev);
60 const struct mcb_device_id *found_id;
61 struct module *carrier_mod;
62 int ret;
63
64 found_id = mcb_match_id(mdrv->id_table, mdev);
65 if (!found_id)
66 return -ENODEV;
67
68 carrier_mod = mdev->dev.parent->driver->owner;
69 if (!try_module_get(carrier_mod))
70 return -EINVAL;
71
72 get_device(dev);
73 ret = mdrv->probe(mdev, found_id);
74 if (ret)
75 module_put(carrier_mod);
76
77 return ret;
78}
79
80static int mcb_remove(struct device *dev)
81{
82 struct mcb_driver *mdrv = to_mcb_driver(dev->driver);
83 struct mcb_device *mdev = to_mcb_device(dev);
84 struct module *carrier_mod;
85
86 mdrv->remove(mdev);
87
88 carrier_mod = mdev->dev.parent->driver->owner;
89 module_put(carrier_mod);
90
91 put_device(&mdev->dev);
92
93 return 0;
94}
95
96static void mcb_shutdown(struct device *dev)
97{
98 struct mcb_driver *mdrv = to_mcb_driver(dev->driver);
99 struct mcb_device *mdev = to_mcb_device(dev);
100
101 if (mdrv && mdrv->shutdown)
102 mdrv->shutdown(mdev);
103}
104
105static ssize_t revision_show(struct device *dev, struct device_attribute *attr,
106 char *buf)
107{
108 struct mcb_bus *bus = to_mcb_bus(dev);
109
110 return scnprintf(buf, PAGE_SIZE, "%d\n", bus->revision);
111}
112static DEVICE_ATTR_RO(revision);
113
114static ssize_t model_show(struct device *dev, struct device_attribute *attr,
115 char *buf)
116{
117 struct mcb_bus *bus = to_mcb_bus(dev);
118
119 return scnprintf(buf, PAGE_SIZE, "%c\n", bus->model);
120}
121static DEVICE_ATTR_RO(model);
122
123static ssize_t minor_show(struct device *dev, struct device_attribute *attr,
124 char *buf)
125{
126 struct mcb_bus *bus = to_mcb_bus(dev);
127
128 return scnprintf(buf, PAGE_SIZE, "%d\n", bus->minor);
129}
130static DEVICE_ATTR_RO(minor);
131
132static ssize_t name_show(struct device *dev, struct device_attribute *attr,
133 char *buf)
134{
135 struct mcb_bus *bus = to_mcb_bus(dev);
136
137 return scnprintf(buf, PAGE_SIZE, "%s\n", bus->name);
138}
139static DEVICE_ATTR_RO(name);
140
141static struct attribute *mcb_bus_attrs[] = {
142 &dev_attr_revision.attr,
143 &dev_attr_model.attr,
144 &dev_attr_minor.attr,
145 &dev_attr_name.attr,
146 NULL,
147};
148
149static const struct attribute_group mcb_carrier_group = {
150 .attrs = mcb_bus_attrs,
151};
152
153static const struct attribute_group *mcb_carrier_groups[] = {
154 &mcb_carrier_group,
155 NULL,
156};
157
158
159static struct bus_type mcb_bus_type = {
160 .name = "mcb",
161 .match = mcb_match,
162 .uevent = mcb_uevent,
163 .probe = mcb_probe,
164 .remove = mcb_remove,
165 .shutdown = mcb_shutdown,
166};
167
168static struct device_type mcb_carrier_device_type = {
169 .name = "mcb-carrier",
170 .groups = mcb_carrier_groups,
171};
172
173/**
174 * __mcb_register_driver() - Register a @mcb_driver at the system
175 * @drv: The @mcb_driver
176 * @owner: The @mcb_driver's module
177 * @mod_name: The name of the @mcb_driver's module
178 *
179 * Register a @mcb_driver at the system. Perform some sanity checks, if
180 * the .probe and .remove methods are provided by the driver.
181 */
182int __mcb_register_driver(struct mcb_driver *drv, struct module *owner,
183 const char *mod_name)
184{
185 if (!drv->probe || !drv->remove)
186 return -EINVAL;
187
188 drv->driver.owner = owner;
189 drv->driver.bus = &mcb_bus_type;
190 drv->driver.mod_name = mod_name;
191
192 return driver_register(&drv->driver);
193}
194EXPORT_SYMBOL_NS_GPL(__mcb_register_driver, MCB);
195
196/**
197 * mcb_unregister_driver() - Unregister a @mcb_driver from the system
198 * @drv: The @mcb_driver
199 *
200 * Unregister a @mcb_driver from the system.
201 */
202void mcb_unregister_driver(struct mcb_driver *drv)
203{
204 driver_unregister(&drv->driver);
205}
206EXPORT_SYMBOL_NS_GPL(mcb_unregister_driver, MCB);
207
208static void mcb_release_dev(struct device *dev)
209{
210 struct mcb_device *mdev = to_mcb_device(dev);
211
212 mcb_bus_put(mdev->bus);
213 kfree(mdev);
214}
215
216/**
217 * mcb_device_register() - Register a mcb_device
218 * @bus: The @mcb_bus of the device
219 * @dev: The @mcb_device
220 *
221 * Register a specific @mcb_device at a @mcb_bus and the system itself.
222 */
223int mcb_device_register(struct mcb_bus *bus, struct mcb_device *dev)
224{
225 int ret;
226 int device_id;
227
228 device_initialize(&dev->dev);
229 mcb_bus_get(bus);
230 dev->dev.bus = &mcb_bus_type;
231 dev->dev.parent = bus->dev.parent;
232 dev->dev.release = mcb_release_dev;
233 dev->dma_dev = bus->carrier;
234
235 device_id = dev->id;
236 dev_set_name(&dev->dev, "mcb%d-16z%03d-%d:%d:%d",
237 bus->bus_nr, device_id, dev->inst, dev->group, dev->var);
238
239 ret = device_add(&dev->dev);
240 if (ret < 0) {
241 pr_err("Failed registering device 16z%03d on bus mcb%d (%d)\n",
242 device_id, bus->bus_nr, ret);
243 goto out;
244 }
245
246 return 0;
247
248out:
249
250 return ret;
251}
252EXPORT_SYMBOL_NS_GPL(mcb_device_register, MCB);
253
254static void mcb_free_bus(struct device *dev)
255{
256 struct mcb_bus *bus = to_mcb_bus(dev);
257
258 put_device(bus->carrier);
259 ida_simple_remove(&mcb_ida, bus->bus_nr);
260 kfree(bus);
261}
262
263/**
264 * mcb_alloc_bus() - Allocate a new @mcb_bus
265 *
266 * Allocate a new @mcb_bus.
267 */
268struct mcb_bus *mcb_alloc_bus(struct device *carrier)
269{
270 struct mcb_bus *bus;
271 int bus_nr;
272 int rc;
273
274 bus = kzalloc(sizeof(struct mcb_bus), GFP_KERNEL);
275 if (!bus)
276 return ERR_PTR(-ENOMEM);
277
278 bus_nr = ida_simple_get(&mcb_ida, 0, 0, GFP_KERNEL);
279 if (bus_nr < 0) {
280 rc = bus_nr;
281 goto err_free;
282 }
283
284 bus->bus_nr = bus_nr;
285 bus->carrier = get_device(carrier);
286
287 device_initialize(&bus->dev);
288 bus->dev.parent = carrier;
289 bus->dev.bus = &mcb_bus_type;
290 bus->dev.type = &mcb_carrier_device_type;
291 bus->dev.release = &mcb_free_bus;
292
293 dev_set_name(&bus->dev, "mcb:%d", bus_nr);
294 rc = device_add(&bus->dev);
295 if (rc)
296 goto err_free;
297
298 return bus;
299err_free:
300 put_device(carrier);
301 kfree(bus);
302 return ERR_PTR(rc);
303}
304EXPORT_SYMBOL_NS_GPL(mcb_alloc_bus, MCB);
305
306static int __mcb_devices_unregister(struct device *dev, void *data)
307{
308 device_unregister(dev);
309 return 0;
310}
311
312static void mcb_devices_unregister(struct mcb_bus *bus)
313{
314 bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_devices_unregister);
315}
316/**
317 * mcb_release_bus() - Free a @mcb_bus
318 * @bus: The @mcb_bus to release
319 *
320 * Release an allocated @mcb_bus from the system.
321 */
322void mcb_release_bus(struct mcb_bus *bus)
323{
324 mcb_devices_unregister(bus);
325}
326EXPORT_SYMBOL_NS_GPL(mcb_release_bus, MCB);
327
328/**
329 * mcb_bus_put() - Increment refcnt
330 * @bus: The @mcb_bus
331 *
332 * Get a @mcb_bus' ref
333 */
334struct mcb_bus *mcb_bus_get(struct mcb_bus *bus)
335{
336 if (bus)
337 get_device(&bus->dev);
338
339 return bus;
340}
341EXPORT_SYMBOL_NS_GPL(mcb_bus_get, MCB);
342
343/**
344 * mcb_bus_put() - Decrement refcnt
345 * @bus: The @mcb_bus
346 *
347 * Release a @mcb_bus' ref
348 */
349void mcb_bus_put(struct mcb_bus *bus)
350{
351 if (bus)
352 put_device(&bus->dev);
353}
354EXPORT_SYMBOL_NS_GPL(mcb_bus_put, MCB);
355
356/**
357 * mcb_alloc_dev() - Allocate a device
358 * @bus: The @mcb_bus the device is part of
359 *
360 * Allocate a @mcb_device and add bus.
361 */
362struct mcb_device *mcb_alloc_dev(struct mcb_bus *bus)
363{
364 struct mcb_device *dev;
365
366 dev = kzalloc(sizeof(struct mcb_device), GFP_KERNEL);
367 if (!dev)
368 return NULL;
369
370 dev->bus = bus;
371
372 return dev;
373}
374EXPORT_SYMBOL_NS_GPL(mcb_alloc_dev, MCB);
375
376/**
377 * mcb_free_dev() - Free @mcb_device
378 * @dev: The device to free
379 *
380 * Free a @mcb_device
381 */
382void mcb_free_dev(struct mcb_device *dev)
383{
384 kfree(dev);
385}
386EXPORT_SYMBOL_NS_GPL(mcb_free_dev, MCB);
387
388static int __mcb_bus_add_devices(struct device *dev, void *data)
389{
390 struct mcb_device *mdev = to_mcb_device(dev);
391 int retval;
392
393 if (mdev->is_added)
394 return 0;
395
396 retval = device_attach(dev);
397 if (retval < 0)
398 dev_err(dev, "Error adding device (%d)\n", retval);
399
400 mdev->is_added = true;
401
402 return 0;
403}
404
405/**
406 * mcb_bus_add_devices() - Add devices in the bus' internal device list
407 * @bus: The @mcb_bus we add the devices
408 *
409 * Add devices in the bus' internal device list to the system.
410 */
411void mcb_bus_add_devices(const struct mcb_bus *bus)
412{
413 bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_bus_add_devices);
414}
415EXPORT_SYMBOL_NS_GPL(mcb_bus_add_devices, MCB);
416
417/**
418 * mcb_get_resource() - get a resource for a mcb device
419 * @dev: the mcb device
420 * @type: the type of resource
421 */
422struct resource *mcb_get_resource(struct mcb_device *dev, unsigned int type)
423{
424 if (type == IORESOURCE_MEM)
425 return &dev->mem;
426 else if (type == IORESOURCE_IRQ)
427 return &dev->irq;
428 else
429 return NULL;
430}
431EXPORT_SYMBOL_NS_GPL(mcb_get_resource, MCB);
432
433/**
434 * mcb_request_mem() - Request memory
435 * @dev: The @mcb_device the memory is for
436 * @name: The name for the memory reference.
437 *
438 * Request memory for a @mcb_device. If @name is NULL the driver name will
439 * be used.
440 */
441struct resource *mcb_request_mem(struct mcb_device *dev, const char *name)
442{
443 struct resource *mem;
444 u32 size;
445
446 if (!name)
447 name = dev->dev.driver->name;
448
449 size = resource_size(&dev->mem);
450
451 mem = request_mem_region(dev->mem.start, size, name);
452 if (!mem)
453 return ERR_PTR(-EBUSY);
454
455 return mem;
456}
457EXPORT_SYMBOL_NS_GPL(mcb_request_mem, MCB);
458
459/**
460 * mcb_release_mem() - Release memory requested by device
461 * @dev: The @mcb_device that requested the memory
462 *
463 * Release memory that was prior requested via @mcb_request_mem().
464 */
465void mcb_release_mem(struct resource *mem)
466{
467 u32 size;
468
469 size = resource_size(mem);
470 release_mem_region(mem->start, size);
471}
472EXPORT_SYMBOL_NS_GPL(mcb_release_mem, MCB);
473
474static int __mcb_get_irq(struct mcb_device *dev)
475{
476 struct resource *irq;
477
478 irq = mcb_get_resource(dev, IORESOURCE_IRQ);
479
480 return irq->start;
481}
482
483/**
484 * mcb_get_irq() - Get device's IRQ number
485 * @dev: The @mcb_device the IRQ is for
486 *
487 * Get the IRQ number of a given @mcb_device.
488 */
489int mcb_get_irq(struct mcb_device *dev)
490{
491 struct mcb_bus *bus = dev->bus;
492
493 if (bus->get_irq)
494 return bus->get_irq(dev);
495
496 return __mcb_get_irq(dev);
497}
498EXPORT_SYMBOL_NS_GPL(mcb_get_irq, MCB);
499
500static int mcb_init(void)
501{
502 return bus_register(&mcb_bus_type);
503}
504
505static void mcb_exit(void)
506{
507 ida_destroy(&mcb_ida);
508 bus_unregister(&mcb_bus_type);
509}
510
511/* mcb must be initialized after PCI but before the chameleon drivers.
512 * That means we must use some initcall between subsys_initcall and
513 * device_initcall.
514 */
515fs_initcall(mcb_init);
516module_exit(mcb_exit);
517
518MODULE_DESCRIPTION("MEN Chameleon Bus Driver");
519MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
520MODULE_LICENSE("GPL v2");