misc/tifm_core: convert to idr_alloc()
[~shefty/rdma-dev.git] / drivers / misc / tifm_core.c
1 /*
2  *  tifm_core.c - TI FlashMedia driver
3  *
4  *  Copyright (C) 2006 Alex Dubov <oakad@yahoo.com>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  *
10  */
11
12 #include <linux/tifm.h>
13 #include <linux/slab.h>
14 #include <linux/init.h>
15 #include <linux/idr.h>
16 #include <linux/module.h>
17
18 #define DRIVER_NAME "tifm_core"
19 #define DRIVER_VERSION "0.8"
20
21 static struct workqueue_struct *workqueue;
22 static DEFINE_IDR(tifm_adapter_idr);
23 static DEFINE_SPINLOCK(tifm_adapter_lock);
24
25 static const char *tifm_media_type_name(unsigned char type, unsigned char nt)
26 {
27         const char *card_type_name[3][3] = {
28                 { "SmartMedia/xD", "MemoryStick", "MMC/SD" },
29                 { "XD", "MS", "SD"},
30                 { "xd", "ms", "sd"}
31         };
32
33         if (nt > 2 || type < 1 || type > 3)
34                 return NULL;
35         return card_type_name[nt][type - 1];
36 }
37
38 static int tifm_dev_match(struct tifm_dev *sock, struct tifm_device_id *id)
39 {
40         if (sock->type == id->type)
41                 return 1;
42         return 0;
43 }
44
45 static int tifm_bus_match(struct device *dev, struct device_driver *drv)
46 {
47         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
48         struct tifm_driver *fm_drv = container_of(drv, struct tifm_driver,
49                                                   driver);
50         struct tifm_device_id *ids = fm_drv->id_table;
51
52         if (ids) {
53                 while (ids->type) {
54                         if (tifm_dev_match(sock, ids))
55                                 return 1;
56                         ++ids;
57                 }
58         }
59         return 0;
60 }
61
62 static int tifm_uevent(struct device *dev, struct kobj_uevent_env *env)
63 {
64         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
65
66         if (add_uevent_var(env, "TIFM_CARD_TYPE=%s", tifm_media_type_name(sock->type, 1)))
67                 return -ENOMEM;
68
69         return 0;
70 }
71
72 static int tifm_device_probe(struct device *dev)
73 {
74         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
75         struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
76                                                driver);
77         int rc = -ENODEV;
78
79         get_device(dev);
80         if (dev->driver && drv->probe) {
81                 rc = drv->probe(sock);
82                 if (!rc)
83                         return 0;
84         }
85         put_device(dev);
86         return rc;
87 }
88
89 static void tifm_dummy_event(struct tifm_dev *sock)
90 {
91         return;
92 }
93
94 static int tifm_device_remove(struct device *dev)
95 {
96         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
97         struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
98                                                driver);
99
100         if (dev->driver && drv->remove) {
101                 sock->card_event = tifm_dummy_event;
102                 sock->data_event = tifm_dummy_event;
103                 drv->remove(sock);
104                 sock->dev.driver = NULL;
105         }
106
107         put_device(dev);
108         return 0;
109 }
110
111 #ifdef CONFIG_PM
112
113 static int tifm_device_suspend(struct device *dev, pm_message_t state)
114 {
115         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
116         struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
117                                                driver);
118
119         if (dev->driver && drv->suspend)
120                 return drv->suspend(sock, state);
121         return 0;
122 }
123
124 static int tifm_device_resume(struct device *dev)
125 {
126         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
127         struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
128                                                driver);
129
130         if (dev->driver && drv->resume)
131                 return drv->resume(sock);
132         return 0;
133 }
134
135 #else
136
137 #define tifm_device_suspend NULL
138 #define tifm_device_resume NULL
139
140 #endif /* CONFIG_PM */
141
142 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
143                          char *buf)
144 {
145         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
146         return sprintf(buf, "%x", sock->type);
147 }
148
149 static struct device_attribute tifm_dev_attrs[] = {
150         __ATTR(type, S_IRUGO, type_show, NULL),
151         __ATTR_NULL
152 };
153
154 static struct bus_type tifm_bus_type = {
155         .name      = "tifm",
156         .dev_attrs = tifm_dev_attrs,
157         .match     = tifm_bus_match,
158         .uevent    = tifm_uevent,
159         .probe     = tifm_device_probe,
160         .remove    = tifm_device_remove,
161         .suspend   = tifm_device_suspend,
162         .resume    = tifm_device_resume
163 };
164
165 static void tifm_free(struct device *dev)
166 {
167         struct tifm_adapter *fm = container_of(dev, struct tifm_adapter, dev);
168
169         kfree(fm);
170 }
171
172 static struct class tifm_adapter_class = {
173         .name    = "tifm_adapter",
174         .dev_release = tifm_free
175 };
176
177 struct tifm_adapter *tifm_alloc_adapter(unsigned int num_sockets,
178                                         struct device *dev)
179 {
180         struct tifm_adapter *fm;
181
182         fm = kzalloc(sizeof(struct tifm_adapter)
183                      + sizeof(struct tifm_dev*) * num_sockets, GFP_KERNEL);
184         if (fm) {
185                 fm->dev.class = &tifm_adapter_class;
186                 fm->dev.parent = dev;
187                 device_initialize(&fm->dev);
188                 spin_lock_init(&fm->lock);
189                 fm->num_sockets = num_sockets;
190         }
191         return fm;
192 }
193 EXPORT_SYMBOL(tifm_alloc_adapter);
194
195 int tifm_add_adapter(struct tifm_adapter *fm)
196 {
197         int rc;
198
199         idr_preload(GFP_KERNEL);
200         spin_lock(&tifm_adapter_lock);
201         rc = idr_alloc(&tifm_adapter_idr, fm, 0, 0, GFP_NOWAIT);
202         if (rc >= 0)
203                 fm->id = rc;
204         spin_unlock(&tifm_adapter_lock);
205         idr_preload_end();
206         if (rc < 0)
207                 return rc;
208
209         dev_set_name(&fm->dev, "tifm%u", fm->id);
210         rc = device_add(&fm->dev);
211         if (rc) {
212                 spin_lock(&tifm_adapter_lock);
213                 idr_remove(&tifm_adapter_idr, fm->id);
214                 spin_unlock(&tifm_adapter_lock);
215         }
216
217         return rc;
218 }
219 EXPORT_SYMBOL(tifm_add_adapter);
220
221 void tifm_remove_adapter(struct tifm_adapter *fm)
222 {
223         unsigned int cnt;
224
225         flush_workqueue(workqueue);
226         for (cnt = 0; cnt < fm->num_sockets; ++cnt) {
227                 if (fm->sockets[cnt])
228                         device_unregister(&fm->sockets[cnt]->dev);
229         }
230
231         spin_lock(&tifm_adapter_lock);
232         idr_remove(&tifm_adapter_idr, fm->id);
233         spin_unlock(&tifm_adapter_lock);
234         device_del(&fm->dev);
235 }
236 EXPORT_SYMBOL(tifm_remove_adapter);
237
238 void tifm_free_adapter(struct tifm_adapter *fm)
239 {
240         put_device(&fm->dev);
241 }
242 EXPORT_SYMBOL(tifm_free_adapter);
243
244 void tifm_free_device(struct device *dev)
245 {
246         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
247         kfree(sock);
248 }
249 EXPORT_SYMBOL(tifm_free_device);
250
251 struct tifm_dev *tifm_alloc_device(struct tifm_adapter *fm, unsigned int id,
252                                    unsigned char type)
253 {
254         struct tifm_dev *sock = NULL;
255
256         if (!tifm_media_type_name(type, 0))
257                 return sock;
258
259         sock = kzalloc(sizeof(struct tifm_dev), GFP_KERNEL);
260         if (sock) {
261                 spin_lock_init(&sock->lock);
262                 sock->type = type;
263                 sock->socket_id = id;
264                 sock->card_event = tifm_dummy_event;
265                 sock->data_event = tifm_dummy_event;
266
267                 sock->dev.parent = fm->dev.parent;
268                 sock->dev.bus = &tifm_bus_type;
269                 sock->dev.dma_mask = fm->dev.parent->dma_mask;
270                 sock->dev.release = tifm_free_device;
271
272                 dev_set_name(&sock->dev, "tifm_%s%u:%u",
273                              tifm_media_type_name(type, 2), fm->id, id);
274                 printk(KERN_INFO DRIVER_NAME
275                        ": %s card detected in socket %u:%u\n",
276                        tifm_media_type_name(type, 0), fm->id, id);
277         }
278         return sock;
279 }
280 EXPORT_SYMBOL(tifm_alloc_device);
281
282 void tifm_eject(struct tifm_dev *sock)
283 {
284         struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
285         fm->eject(fm, sock);
286 }
287 EXPORT_SYMBOL(tifm_eject);
288
289 int tifm_has_ms_pif(struct tifm_dev *sock)
290 {
291         struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
292         return fm->has_ms_pif(fm, sock);
293 }
294 EXPORT_SYMBOL(tifm_has_ms_pif);
295
296 int tifm_map_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
297                 int direction)
298 {
299         return pci_map_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
300 }
301 EXPORT_SYMBOL(tifm_map_sg);
302
303 void tifm_unmap_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
304                    int direction)
305 {
306         pci_unmap_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
307 }
308 EXPORT_SYMBOL(tifm_unmap_sg);
309
310 void tifm_queue_work(struct work_struct *work)
311 {
312         queue_work(workqueue, work);
313 }
314 EXPORT_SYMBOL(tifm_queue_work);
315
316 int tifm_register_driver(struct tifm_driver *drv)
317 {
318         drv->driver.bus = &tifm_bus_type;
319
320         return driver_register(&drv->driver);
321 }
322 EXPORT_SYMBOL(tifm_register_driver);
323
324 void tifm_unregister_driver(struct tifm_driver *drv)
325 {
326         driver_unregister(&drv->driver);
327 }
328 EXPORT_SYMBOL(tifm_unregister_driver);
329
330 static int __init tifm_init(void)
331 {
332         int rc;
333
334         workqueue = create_freezable_workqueue("tifm");
335         if (!workqueue)
336                 return -ENOMEM;
337
338         rc = bus_register(&tifm_bus_type);
339
340         if (rc)
341                 goto err_out_wq;
342
343         rc = class_register(&tifm_adapter_class);
344         if (!rc)
345                 return 0;
346
347         bus_unregister(&tifm_bus_type);
348
349 err_out_wq:
350         destroy_workqueue(workqueue);
351
352         return rc;
353 }
354
355 static void __exit tifm_exit(void)
356 {
357         class_unregister(&tifm_adapter_class);
358         bus_unregister(&tifm_bus_type);
359         destroy_workqueue(workqueue);
360 }
361
362 subsys_initcall(tifm_init);
363 module_exit(tifm_exit);
364
365 MODULE_LICENSE("GPL");
366 MODULE_AUTHOR("Alex Dubov");
367 MODULE_DESCRIPTION("TI FlashMedia core driver");
368 MODULE_LICENSE("GPL");
369 MODULE_VERSION(DRIVER_VERSION);