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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * FPGA Bridge Framework Driver
4 *
5 * Copyright (C) 2013-2016 Altera Corporation, All Rights Reserved.
6 * Copyright (C) 2017 Intel Corporation
7 */
8#include <linux/fpga/fpga-bridge.h>
9#include <linux/idr.h>
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/of_platform.h>
13#include <linux/slab.h>
14#include <linux/spinlock.h>
15
16static DEFINE_IDA(fpga_bridge_ida);
17static const struct class fpga_bridge_class;
18
19/* Lock for adding/removing bridges to linked lists*/
20static DEFINE_SPINLOCK(bridge_list_lock);
21
22/**
23 * fpga_bridge_enable - Enable transactions on the bridge
24 *
25 * @bridge: FPGA bridge
26 *
27 * Return: 0 for success, error code otherwise.
28 */
29int fpga_bridge_enable(struct fpga_bridge *bridge)
30{
31 dev_dbg(&bridge->dev, "enable\n");
32
33 if (bridge->br_ops->enable_set)
34 return bridge->br_ops->enable_set(bridge, 1);
35
36 return 0;
37}
38EXPORT_SYMBOL_GPL(fpga_bridge_enable);
39
40/**
41 * fpga_bridge_disable - Disable transactions on the bridge
42 *
43 * @bridge: FPGA bridge
44 *
45 * Return: 0 for success, error code otherwise.
46 */
47int fpga_bridge_disable(struct fpga_bridge *bridge)
48{
49 dev_dbg(&bridge->dev, "disable\n");
50
51 if (bridge->br_ops->enable_set)
52 return bridge->br_ops->enable_set(bridge, 0);
53
54 return 0;
55}
56EXPORT_SYMBOL_GPL(fpga_bridge_disable);
57
58static struct fpga_bridge *__fpga_bridge_get(struct device *bridge_dev,
59 struct fpga_image_info *info)
60{
61 struct fpga_bridge *bridge;
62
63 bridge = to_fpga_bridge(bridge_dev);
64
65 bridge->info = info;
66
67 if (!mutex_trylock(&bridge->mutex))
68 return ERR_PTR(-EBUSY);
69
70 if (!try_module_get(bridge->br_ops_owner)) {
71 mutex_unlock(&bridge->mutex);
72 return ERR_PTR(-ENODEV);
73 }
74
75 dev_dbg(&bridge->dev, "get\n");
76
77 return bridge;
78}
79
80/**
81 * of_fpga_bridge_get - get an exclusive reference to an fpga bridge
82 *
83 * @np: node pointer of an FPGA bridge.
84 * @info: fpga image specific information.
85 *
86 * Return:
87 * * fpga_bridge struct pointer if successful.
88 * * -EBUSY if someone already has a reference to the bridge.
89 * * -ENODEV if @np is not an FPGA Bridge or can't take parent driver refcount.
90 */
91struct fpga_bridge *of_fpga_bridge_get(struct device_node *np,
92 struct fpga_image_info *info)
93{
94 struct fpga_bridge *bridge;
95 struct device *bridge_dev;
96
97 bridge_dev = class_find_device_by_of_node(&fpga_bridge_class, np);
98 if (!bridge_dev)
99 return ERR_PTR(-ENODEV);
100
101 bridge = __fpga_bridge_get(bridge_dev, info);
102 if (IS_ERR(bridge))
103 put_device(bridge_dev);
104
105 return bridge;
106}
107EXPORT_SYMBOL_GPL(of_fpga_bridge_get);
108
109static int fpga_bridge_dev_match(struct device *dev, const void *data)
110{
111 return dev->parent == data;
112}
113
114/**
115 * fpga_bridge_get - get an exclusive reference to an fpga bridge
116 * @dev: parent device that fpga bridge was registered with
117 * @info: fpga image specific information
118 *
119 * Given a device, get an exclusive reference to an fpga bridge.
120 *
121 * Return: fpga bridge struct or IS_ERR() condition containing error code.
122 */
123struct fpga_bridge *fpga_bridge_get(struct device *dev,
124 struct fpga_image_info *info)
125{
126 struct fpga_bridge *bridge;
127 struct device *bridge_dev;
128
129 bridge_dev = class_find_device(&fpga_bridge_class, NULL, dev,
130 fpga_bridge_dev_match);
131 if (!bridge_dev)
132 return ERR_PTR(-ENODEV);
133
134 bridge = __fpga_bridge_get(bridge_dev, info);
135 if (IS_ERR(bridge))
136 put_device(bridge_dev);
137
138 return bridge;
139}
140EXPORT_SYMBOL_GPL(fpga_bridge_get);
141
142/**
143 * fpga_bridge_put - release a reference to a bridge
144 *
145 * @bridge: FPGA bridge
146 */
147void fpga_bridge_put(struct fpga_bridge *bridge)
148{
149 dev_dbg(&bridge->dev, "put\n");
150
151 bridge->info = NULL;
152 module_put(bridge->br_ops_owner);
153 mutex_unlock(&bridge->mutex);
154 put_device(&bridge->dev);
155}
156EXPORT_SYMBOL_GPL(fpga_bridge_put);
157
158/**
159 * fpga_bridges_enable - enable bridges in a list
160 * @bridge_list: list of FPGA bridges
161 *
162 * Enable each bridge in the list. If list is empty, do nothing.
163 *
164 * Return: 0 for success or empty bridge list or an error code otherwise.
165 */
166int fpga_bridges_enable(struct list_head *bridge_list)
167{
168 struct fpga_bridge *bridge;
169 int ret;
170
171 list_for_each_entry(bridge, bridge_list, node) {
172 ret = fpga_bridge_enable(bridge);
173 if (ret)
174 return ret;
175 }
176
177 return 0;
178}
179EXPORT_SYMBOL_GPL(fpga_bridges_enable);
180
181/**
182 * fpga_bridges_disable - disable bridges in a list
183 *
184 * @bridge_list: list of FPGA bridges
185 *
186 * Disable each bridge in the list. If list is empty, do nothing.
187 *
188 * Return: 0 for success or empty bridge list or an error code otherwise.
189 */
190int fpga_bridges_disable(struct list_head *bridge_list)
191{
192 struct fpga_bridge *bridge;
193 int ret;
194
195 list_for_each_entry(bridge, bridge_list, node) {
196 ret = fpga_bridge_disable(bridge);
197 if (ret)
198 return ret;
199 }
200
201 return 0;
202}
203EXPORT_SYMBOL_GPL(fpga_bridges_disable);
204
205/**
206 * fpga_bridges_put - put bridges
207 *
208 * @bridge_list: list of FPGA bridges
209 *
210 * For each bridge in the list, put the bridge and remove it from the list.
211 * If list is empty, do nothing.
212 */
213void fpga_bridges_put(struct list_head *bridge_list)
214{
215 struct fpga_bridge *bridge, *next;
216 unsigned long flags;
217
218 list_for_each_entry_safe(bridge, next, bridge_list, node) {
219 fpga_bridge_put(bridge);
220
221 spin_lock_irqsave(&bridge_list_lock, flags);
222 list_del(&bridge->node);
223 spin_unlock_irqrestore(&bridge_list_lock, flags);
224 }
225}
226EXPORT_SYMBOL_GPL(fpga_bridges_put);
227
228/**
229 * of_fpga_bridge_get_to_list - get a bridge, add it to a list
230 *
231 * @np: node pointer of an FPGA bridge
232 * @info: fpga image specific information
233 * @bridge_list: list of FPGA bridges
234 *
235 * Get an exclusive reference to the bridge and it to the list.
236 *
237 * Return: 0 for success, error code from of_fpga_bridge_get() otherwise.
238 */
239int of_fpga_bridge_get_to_list(struct device_node *np,
240 struct fpga_image_info *info,
241 struct list_head *bridge_list)
242{
243 struct fpga_bridge *bridge;
244 unsigned long flags;
245
246 bridge = of_fpga_bridge_get(np, info);
247 if (IS_ERR(bridge))
248 return PTR_ERR(bridge);
249
250 spin_lock_irqsave(&bridge_list_lock, flags);
251 list_add(&bridge->node, bridge_list);
252 spin_unlock_irqrestore(&bridge_list_lock, flags);
253
254 return 0;
255}
256EXPORT_SYMBOL_GPL(of_fpga_bridge_get_to_list);
257
258/**
259 * fpga_bridge_get_to_list - given device, get a bridge, add it to a list
260 *
261 * @dev: FPGA bridge device
262 * @info: fpga image specific information
263 * @bridge_list: list of FPGA bridges
264 *
265 * Get an exclusive reference to the bridge and it to the list.
266 *
267 * Return: 0 for success, error code from fpga_bridge_get() otherwise.
268 */
269int fpga_bridge_get_to_list(struct device *dev,
270 struct fpga_image_info *info,
271 struct list_head *bridge_list)
272{
273 struct fpga_bridge *bridge;
274 unsigned long flags;
275
276 bridge = fpga_bridge_get(dev, info);
277 if (IS_ERR(bridge))
278 return PTR_ERR(bridge);
279
280 spin_lock_irqsave(&bridge_list_lock, flags);
281 list_add(&bridge->node, bridge_list);
282 spin_unlock_irqrestore(&bridge_list_lock, flags);
283
284 return 0;
285}
286EXPORT_SYMBOL_GPL(fpga_bridge_get_to_list);
287
288static ssize_t name_show(struct device *dev,
289 struct device_attribute *attr, char *buf)
290{
291 struct fpga_bridge *bridge = to_fpga_bridge(dev);
292
293 return sprintf(buf, "%s\n", bridge->name);
294}
295
296static ssize_t state_show(struct device *dev,
297 struct device_attribute *attr, char *buf)
298{
299 struct fpga_bridge *bridge = to_fpga_bridge(dev);
300 int state = 1;
301
302 if (bridge->br_ops->enable_show) {
303 state = bridge->br_ops->enable_show(bridge);
304 if (state < 0)
305 return state;
306 }
307
308 return sysfs_emit(buf, "%s\n", state ? "enabled" : "disabled");
309}
310
311static DEVICE_ATTR_RO(name);
312static DEVICE_ATTR_RO(state);
313
314static struct attribute *fpga_bridge_attrs[] = {
315 &dev_attr_name.attr,
316 &dev_attr_state.attr,
317 NULL,
318};
319ATTRIBUTE_GROUPS(fpga_bridge);
320
321/**
322 * __fpga_bridge_register - create and register an FPGA Bridge device
323 * @parent: FPGA bridge device from pdev
324 * @name: FPGA bridge name
325 * @br_ops: pointer to structure of fpga bridge ops
326 * @priv: FPGA bridge private data
327 * @owner: owner module containing the br_ops
328 *
329 * Return: struct fpga_bridge pointer or ERR_PTR()
330 */
331struct fpga_bridge *
332__fpga_bridge_register(struct device *parent, const char *name,
333 const struct fpga_bridge_ops *br_ops,
334 void *priv, struct module *owner)
335{
336 struct fpga_bridge *bridge;
337 int id, ret;
338
339 if (!br_ops) {
340 dev_err(parent, "Attempt to register without fpga_bridge_ops\n");
341 return ERR_PTR(-EINVAL);
342 }
343
344 if (!name || !strlen(name)) {
345 dev_err(parent, "Attempt to register with no name!\n");
346 return ERR_PTR(-EINVAL);
347 }
348
349 bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
350 if (!bridge)
351 return ERR_PTR(-ENOMEM);
352
353 id = ida_alloc(&fpga_bridge_ida, GFP_KERNEL);
354 if (id < 0) {
355 ret = id;
356 goto error_kfree;
357 }
358
359 mutex_init(&bridge->mutex);
360 INIT_LIST_HEAD(&bridge->node);
361
362 bridge->name = name;
363 bridge->br_ops = br_ops;
364 bridge->br_ops_owner = owner;
365 bridge->priv = priv;
366
367 bridge->dev.groups = br_ops->groups;
368 bridge->dev.class = &fpga_bridge_class;
369 bridge->dev.parent = parent;
370 bridge->dev.of_node = parent->of_node;
371 bridge->dev.id = id;
372
373 ret = dev_set_name(&bridge->dev, "br%d", id);
374 if (ret)
375 goto error_device;
376
377 ret = device_register(&bridge->dev);
378 if (ret) {
379 put_device(&bridge->dev);
380 return ERR_PTR(ret);
381 }
382
383 of_platform_populate(bridge->dev.of_node, NULL, NULL, &bridge->dev);
384
385 return bridge;
386
387error_device:
388 ida_free(&fpga_bridge_ida, id);
389error_kfree:
390 kfree(bridge);
391
392 return ERR_PTR(ret);
393}
394EXPORT_SYMBOL_GPL(__fpga_bridge_register);
395
396/**
397 * fpga_bridge_unregister - unregister an FPGA bridge
398 *
399 * @bridge: FPGA bridge struct
400 *
401 * This function is intended for use in an FPGA bridge driver's remove function.
402 */
403void fpga_bridge_unregister(struct fpga_bridge *bridge)
404{
405 /*
406 * If the low level driver provides a method for putting bridge into
407 * a desired state upon unregister, do it.
408 */
409 if (bridge->br_ops->fpga_bridge_remove)
410 bridge->br_ops->fpga_bridge_remove(bridge);
411
412 device_unregister(&bridge->dev);
413}
414EXPORT_SYMBOL_GPL(fpga_bridge_unregister);
415
416static void fpga_bridge_dev_release(struct device *dev)
417{
418 struct fpga_bridge *bridge = to_fpga_bridge(dev);
419
420 ida_free(&fpga_bridge_ida, bridge->dev.id);
421 kfree(bridge);
422}
423
424static const struct class fpga_bridge_class = {
425 .name = "fpga_bridge",
426 .dev_groups = fpga_bridge_groups,
427 .dev_release = fpga_bridge_dev_release,
428};
429
430static int __init fpga_bridge_dev_init(void)
431{
432 return class_register(&fpga_bridge_class);
433}
434
435static void __exit fpga_bridge_dev_exit(void)
436{
437 class_unregister(&fpga_bridge_class);
438 ida_destroy(&fpga_bridge_ida);
439}
440
441MODULE_DESCRIPTION("FPGA Bridge Driver");
442MODULE_AUTHOR("Alan Tull <atull@kernel.org>");
443MODULE_LICENSE("GPL v2");
444
445subsys_initcall(fpga_bridge_dev_init);
446module_exit(fpga_bridge_dev_exit);
1/*
2 * FPGA Bridge Framework Driver
3 *
4 * Copyright (C) 2013-2016 Altera Corporation, All Rights Reserved.
5 * Copyright (C) 2017 Intel Corporation
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms and conditions of the GNU General Public License,
9 * version 2, as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19#include <linux/fpga/fpga-bridge.h>
20#include <linux/idr.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/of_platform.h>
24#include <linux/slab.h>
25#include <linux/spinlock.h>
26
27static DEFINE_IDA(fpga_bridge_ida);
28static struct class *fpga_bridge_class;
29
30/* Lock for adding/removing bridges to linked lists*/
31static spinlock_t bridge_list_lock;
32
33static int fpga_bridge_of_node_match(struct device *dev, const void *data)
34{
35 return dev->of_node == data;
36}
37
38/**
39 * fpga_bridge_enable - Enable transactions on the bridge
40 *
41 * @bridge: FPGA bridge
42 *
43 * Return: 0 for success, error code otherwise.
44 */
45int fpga_bridge_enable(struct fpga_bridge *bridge)
46{
47 dev_dbg(&bridge->dev, "enable\n");
48
49 if (bridge->br_ops && bridge->br_ops->enable_set)
50 return bridge->br_ops->enable_set(bridge, 1);
51
52 return 0;
53}
54EXPORT_SYMBOL_GPL(fpga_bridge_enable);
55
56/**
57 * fpga_bridge_disable - Disable transactions on the bridge
58 *
59 * @bridge: FPGA bridge
60 *
61 * Return: 0 for success, error code otherwise.
62 */
63int fpga_bridge_disable(struct fpga_bridge *bridge)
64{
65 dev_dbg(&bridge->dev, "disable\n");
66
67 if (bridge->br_ops && bridge->br_ops->enable_set)
68 return bridge->br_ops->enable_set(bridge, 0);
69
70 return 0;
71}
72EXPORT_SYMBOL_GPL(fpga_bridge_disable);
73
74static struct fpga_bridge *__fpga_bridge_get(struct device *dev,
75 struct fpga_image_info *info)
76{
77 struct fpga_bridge *bridge;
78 int ret = -ENODEV;
79
80 bridge = to_fpga_bridge(dev);
81
82 bridge->info = info;
83
84 if (!mutex_trylock(&bridge->mutex)) {
85 ret = -EBUSY;
86 goto err_dev;
87 }
88
89 if (!try_module_get(dev->parent->driver->owner))
90 goto err_ll_mod;
91
92 dev_dbg(&bridge->dev, "get\n");
93
94 return bridge;
95
96err_ll_mod:
97 mutex_unlock(&bridge->mutex);
98err_dev:
99 put_device(dev);
100 return ERR_PTR(ret);
101}
102
103/**
104 * of_fpga_bridge_get - get an exclusive reference to a fpga bridge
105 *
106 * @np: node pointer of a FPGA bridge
107 * @info: fpga image specific information
108 *
109 * Return fpga_bridge struct if successful.
110 * Return -EBUSY if someone already has a reference to the bridge.
111 * Return -ENODEV if @np is not a FPGA Bridge.
112 */
113struct fpga_bridge *of_fpga_bridge_get(struct device_node *np,
114 struct fpga_image_info *info)
115{
116 struct device *dev;
117
118 dev = class_find_device(fpga_bridge_class, NULL, np,
119 fpga_bridge_of_node_match);
120 if (!dev)
121 return ERR_PTR(-ENODEV);
122
123 return __fpga_bridge_get(dev, info);
124}
125EXPORT_SYMBOL_GPL(of_fpga_bridge_get);
126
127static int fpga_bridge_dev_match(struct device *dev, const void *data)
128{
129 return dev->parent == data;
130}
131
132/**
133 * fpga_bridge_get - get an exclusive reference to a fpga bridge
134 * @dev: parent device that fpga bridge was registered with
135 *
136 * Given a device, get an exclusive reference to a fpga bridge.
137 *
138 * Return: fpga manager struct or IS_ERR() condition containing error code.
139 */
140struct fpga_bridge *fpga_bridge_get(struct device *dev,
141 struct fpga_image_info *info)
142{
143 struct device *bridge_dev;
144
145 bridge_dev = class_find_device(fpga_bridge_class, NULL, dev,
146 fpga_bridge_dev_match);
147 if (!bridge_dev)
148 return ERR_PTR(-ENODEV);
149
150 return __fpga_bridge_get(bridge_dev, info);
151}
152EXPORT_SYMBOL_GPL(fpga_bridge_get);
153
154/**
155 * fpga_bridge_put - release a reference to a bridge
156 *
157 * @bridge: FPGA bridge
158 */
159void fpga_bridge_put(struct fpga_bridge *bridge)
160{
161 dev_dbg(&bridge->dev, "put\n");
162
163 bridge->info = NULL;
164 module_put(bridge->dev.parent->driver->owner);
165 mutex_unlock(&bridge->mutex);
166 put_device(&bridge->dev);
167}
168EXPORT_SYMBOL_GPL(fpga_bridge_put);
169
170/**
171 * fpga_bridges_enable - enable bridges in a list
172 * @bridge_list: list of FPGA bridges
173 *
174 * Enable each bridge in the list. If list is empty, do nothing.
175 *
176 * Return 0 for success or empty bridge list; return error code otherwise.
177 */
178int fpga_bridges_enable(struct list_head *bridge_list)
179{
180 struct fpga_bridge *bridge;
181 int ret;
182
183 list_for_each_entry(bridge, bridge_list, node) {
184 ret = fpga_bridge_enable(bridge);
185 if (ret)
186 return ret;
187 }
188
189 return 0;
190}
191EXPORT_SYMBOL_GPL(fpga_bridges_enable);
192
193/**
194 * fpga_bridges_disable - disable bridges in a list
195 *
196 * @bridge_list: list of FPGA bridges
197 *
198 * Disable each bridge in the list. If list is empty, do nothing.
199 *
200 * Return 0 for success or empty bridge list; return error code otherwise.
201 */
202int fpga_bridges_disable(struct list_head *bridge_list)
203{
204 struct fpga_bridge *bridge;
205 int ret;
206
207 list_for_each_entry(bridge, bridge_list, node) {
208 ret = fpga_bridge_disable(bridge);
209 if (ret)
210 return ret;
211 }
212
213 return 0;
214}
215EXPORT_SYMBOL_GPL(fpga_bridges_disable);
216
217/**
218 * fpga_bridges_put - put bridges
219 *
220 * @bridge_list: list of FPGA bridges
221 *
222 * For each bridge in the list, put the bridge and remove it from the list.
223 * If list is empty, do nothing.
224 */
225void fpga_bridges_put(struct list_head *bridge_list)
226{
227 struct fpga_bridge *bridge, *next;
228 unsigned long flags;
229
230 list_for_each_entry_safe(bridge, next, bridge_list, node) {
231 fpga_bridge_put(bridge);
232
233 spin_lock_irqsave(&bridge_list_lock, flags);
234 list_del(&bridge->node);
235 spin_unlock_irqrestore(&bridge_list_lock, flags);
236 }
237}
238EXPORT_SYMBOL_GPL(fpga_bridges_put);
239
240/**
241 * of_fpga_bridge_get_to_list - get a bridge, add it to a list
242 *
243 * @np: node pointer of a FPGA bridge
244 * @info: fpga image specific information
245 * @bridge_list: list of FPGA bridges
246 *
247 * Get an exclusive reference to the bridge and and it to the list.
248 *
249 * Return 0 for success, error code from of_fpga_bridge_get() othewise.
250 */
251int of_fpga_bridge_get_to_list(struct device_node *np,
252 struct fpga_image_info *info,
253 struct list_head *bridge_list)
254{
255 struct fpga_bridge *bridge;
256 unsigned long flags;
257
258 bridge = of_fpga_bridge_get(np, info);
259 if (IS_ERR(bridge))
260 return PTR_ERR(bridge);
261
262 spin_lock_irqsave(&bridge_list_lock, flags);
263 list_add(&bridge->node, bridge_list);
264 spin_unlock_irqrestore(&bridge_list_lock, flags);
265
266 return 0;
267}
268EXPORT_SYMBOL_GPL(of_fpga_bridge_get_to_list);
269
270/**
271 * fpga_bridge_get_to_list - given device, get a bridge, add it to a list
272 *
273 * @dev: FPGA bridge device
274 * @info: fpga image specific information
275 * @bridge_list: list of FPGA bridges
276 *
277 * Get an exclusive reference to the bridge and and it to the list.
278 *
279 * Return 0 for success, error code from fpga_bridge_get() othewise.
280 */
281int fpga_bridge_get_to_list(struct device *dev,
282 struct fpga_image_info *info,
283 struct list_head *bridge_list)
284{
285 struct fpga_bridge *bridge;
286 unsigned long flags;
287
288 bridge = fpga_bridge_get(dev, info);
289 if (IS_ERR(bridge))
290 return PTR_ERR(bridge);
291
292 spin_lock_irqsave(&bridge_list_lock, flags);
293 list_add(&bridge->node, bridge_list);
294 spin_unlock_irqrestore(&bridge_list_lock, flags);
295
296 return 0;
297}
298EXPORT_SYMBOL_GPL(fpga_bridge_get_to_list);
299
300static ssize_t name_show(struct device *dev,
301 struct device_attribute *attr, char *buf)
302{
303 struct fpga_bridge *bridge = to_fpga_bridge(dev);
304
305 return sprintf(buf, "%s\n", bridge->name);
306}
307
308static ssize_t state_show(struct device *dev,
309 struct device_attribute *attr, char *buf)
310{
311 struct fpga_bridge *bridge = to_fpga_bridge(dev);
312 int enable = 1;
313
314 if (bridge->br_ops && bridge->br_ops->enable_show)
315 enable = bridge->br_ops->enable_show(bridge);
316
317 return sprintf(buf, "%s\n", enable ? "enabled" : "disabled");
318}
319
320static DEVICE_ATTR_RO(name);
321static DEVICE_ATTR_RO(state);
322
323static struct attribute *fpga_bridge_attrs[] = {
324 &dev_attr_name.attr,
325 &dev_attr_state.attr,
326 NULL,
327};
328ATTRIBUTE_GROUPS(fpga_bridge);
329
330/**
331 * fpga_bridge_register - register a fpga bridge driver
332 * @dev: FPGA bridge device from pdev
333 * @name: FPGA bridge name
334 * @br_ops: pointer to structure of fpga bridge ops
335 * @priv: FPGA bridge private data
336 *
337 * Return: 0 for success, error code otherwise.
338 */
339int fpga_bridge_register(struct device *dev, const char *name,
340 const struct fpga_bridge_ops *br_ops, void *priv)
341{
342 struct fpga_bridge *bridge;
343 int id, ret = 0;
344
345 if (!name || !strlen(name)) {
346 dev_err(dev, "Attempt to register with no name!\n");
347 return -EINVAL;
348 }
349
350 bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
351 if (!bridge)
352 return -ENOMEM;
353
354 id = ida_simple_get(&fpga_bridge_ida, 0, 0, GFP_KERNEL);
355 if (id < 0) {
356 ret = id;
357 goto error_kfree;
358 }
359
360 mutex_init(&bridge->mutex);
361 INIT_LIST_HEAD(&bridge->node);
362
363 bridge->name = name;
364 bridge->br_ops = br_ops;
365 bridge->priv = priv;
366
367 device_initialize(&bridge->dev);
368 bridge->dev.groups = br_ops->groups;
369 bridge->dev.class = fpga_bridge_class;
370 bridge->dev.parent = dev;
371 bridge->dev.of_node = dev->of_node;
372 bridge->dev.id = id;
373 dev_set_drvdata(dev, bridge);
374
375 ret = dev_set_name(&bridge->dev, "br%d", id);
376 if (ret)
377 goto error_device;
378
379 ret = device_add(&bridge->dev);
380 if (ret)
381 goto error_device;
382
383 of_platform_populate(dev->of_node, NULL, NULL, dev);
384
385 dev_info(bridge->dev.parent, "fpga bridge [%s] registered\n",
386 bridge->name);
387
388 return 0;
389
390error_device:
391 ida_simple_remove(&fpga_bridge_ida, id);
392error_kfree:
393 kfree(bridge);
394
395 return ret;
396}
397EXPORT_SYMBOL_GPL(fpga_bridge_register);
398
399/**
400 * fpga_bridge_unregister - unregister a fpga bridge driver
401 * @dev: FPGA bridge device from pdev
402 */
403void fpga_bridge_unregister(struct device *dev)
404{
405 struct fpga_bridge *bridge = dev_get_drvdata(dev);
406
407 /*
408 * If the low level driver provides a method for putting bridge into
409 * a desired state upon unregister, do it.
410 */
411 if (bridge->br_ops && bridge->br_ops->fpga_bridge_remove)
412 bridge->br_ops->fpga_bridge_remove(bridge);
413
414 device_unregister(&bridge->dev);
415}
416EXPORT_SYMBOL_GPL(fpga_bridge_unregister);
417
418static void fpga_bridge_dev_release(struct device *dev)
419{
420 struct fpga_bridge *bridge = to_fpga_bridge(dev);
421
422 ida_simple_remove(&fpga_bridge_ida, bridge->dev.id);
423 kfree(bridge);
424}
425
426static int __init fpga_bridge_dev_init(void)
427{
428 spin_lock_init(&bridge_list_lock);
429
430 fpga_bridge_class = class_create(THIS_MODULE, "fpga_bridge");
431 if (IS_ERR(fpga_bridge_class))
432 return PTR_ERR(fpga_bridge_class);
433
434 fpga_bridge_class->dev_groups = fpga_bridge_groups;
435 fpga_bridge_class->dev_release = fpga_bridge_dev_release;
436
437 return 0;
438}
439
440static void __exit fpga_bridge_dev_exit(void)
441{
442 class_destroy(fpga_bridge_class);
443 ida_destroy(&fpga_bridge_ida);
444}
445
446MODULE_DESCRIPTION("FPGA Bridge Driver");
447MODULE_AUTHOR("Alan Tull <atull@kernel.org>");
448MODULE_LICENSE("GPL v2");
449
450subsys_initcall(fpga_bridge_dev_init);
451module_exit(fpga_bridge_dev_exit);