tifm: replace per-adapter kthread with freezeable workqueue
[linux-2.6.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/init.h>
14 #include <linux/idr.h>
15
16 #define DRIVER_NAME "tifm_core"
17 #define DRIVER_VERSION "0.8"
18
19 static struct workqueue_struct *workqueue;
20 static DEFINE_IDR(tifm_adapter_idr);
21 static DEFINE_SPINLOCK(tifm_adapter_lock);
22
23 static const char *tifm_media_type_name(unsigned char type, unsigned char nt)
24 {
25         const char *card_type_name[3][3] = {
26                 { "SmartMedia/xD", "MemoryStick", "MMC/SD" },
27                 { "XD", "MS", "SD"},
28                 { "xd", "ms", "sd"}
29         };
30
31         if (nt > 2 || type < 1 || type > 3)
32                 return NULL;
33         return card_type_name[nt][type - 1];
34 }
35
36 static int tifm_dev_match(struct tifm_dev *sock, struct tifm_device_id *id)
37 {
38         if (sock->type == id->type)
39                 return 1;
40         return 0;
41 }
42
43 static int tifm_bus_match(struct device *dev, struct device_driver *drv)
44 {
45         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
46         struct tifm_driver *fm_drv = container_of(drv, struct tifm_driver,
47                                                   driver);
48         struct tifm_device_id *ids = fm_drv->id_table;
49
50         if (ids) {
51                 while (ids->type) {
52                         if (tifm_dev_match(sock, ids))
53                                 return 1;
54                         ++ids;
55                 }
56         }
57         return 0;
58 }
59
60 static int tifm_uevent(struct device *dev, char **envp, int num_envp,
61                        char *buffer, int buffer_size)
62 {
63         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
64         int i = 0;
65         int length = 0;
66
67         if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
68                            "TIFM_CARD_TYPE=%s",
69                            tifm_media_type_name(sock->type, 1)))
70                 return -ENOMEM;
71
72         return 0;
73 }
74
75 static int tifm_device_probe(struct device *dev)
76 {
77         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
78         struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
79                                                driver);
80         int rc = -ENODEV;
81
82         get_device(dev);
83         if (dev->driver && drv->probe) {
84                 rc = drv->probe(sock);
85                 if (!rc)
86                         return 0;
87         }
88         put_device(dev);
89         return rc;
90 }
91
92 static void tifm_dummy_event(struct tifm_dev *sock)
93 {
94         return;
95 }
96
97 static int tifm_device_remove(struct device *dev)
98 {
99         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
100         struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
101                                                driver);
102
103         if (dev->driver && drv->remove) {
104                 sock->card_event = tifm_dummy_event;
105                 sock->data_event = tifm_dummy_event;
106                 drv->remove(sock);
107                 sock->dev.driver = NULL;
108         }
109
110         put_device(dev);
111         return 0;
112 }
113
114 #ifdef CONFIG_PM
115
116 static int tifm_device_suspend(struct device *dev, pm_message_t state)
117 {
118         struct tifm_dev *fm_dev = container_of(dev, struct tifm_dev, dev);
119         struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
120                                                driver);
121
122         if (dev->driver && drv->suspend)
123                 return drv->suspend(fm_dev, state);
124         return 0;
125 }
126
127 static int tifm_device_resume(struct device *dev)
128 {
129         struct tifm_dev *fm_dev = container_of(dev, struct tifm_dev, dev);
130         struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
131                                                driver);
132
133         if (dev->driver && drv->resume)
134                 return drv->resume(fm_dev);
135         return 0;
136 }
137
138 #else
139
140 #define tifm_device_suspend NULL
141 #define tifm_device_resume NULL
142
143 #endif /* CONFIG_PM */
144
145 static struct bus_type tifm_bus_type = {
146         .name    = "tifm",
147         .match   = tifm_bus_match,
148         .uevent  = tifm_uevent,
149         .probe   = tifm_device_probe,
150         .remove  = tifm_device_remove,
151         .suspend = tifm_device_suspend,
152         .resume  = tifm_device_resume
153 };
154
155 static void tifm_free(struct class_device *cdev)
156 {
157         struct tifm_adapter *fm = container_of(cdev, struct tifm_adapter, cdev);
158
159         kfree(fm->sockets);
160         kfree(fm);
161 }
162
163 static struct class tifm_adapter_class = {
164         .name    = "tifm_adapter",
165         .release = tifm_free
166 };
167
168 struct tifm_adapter *tifm_alloc_adapter(void)
169 {
170         struct tifm_adapter *fm;
171
172         fm = kzalloc(sizeof(struct tifm_adapter), GFP_KERNEL);
173         if (fm) {
174                 fm->cdev.class = &tifm_adapter_class;
175                 spin_lock_init(&fm->lock);
176                 class_device_initialize(&fm->cdev);
177         }
178         return fm;
179 }
180 EXPORT_SYMBOL(tifm_alloc_adapter);
181
182 void tifm_free_adapter(struct tifm_adapter *fm)
183 {
184         class_device_put(&fm->cdev);
185 }
186 EXPORT_SYMBOL(tifm_free_adapter);
187
188 int tifm_add_adapter(struct tifm_adapter *fm)
189 {
190         int rc;
191
192         if (!idr_pre_get(&tifm_adapter_idr, GFP_KERNEL))
193                 return -ENOMEM;
194
195         spin_lock(&tifm_adapter_lock);
196         rc = idr_get_new(&tifm_adapter_idr, fm, &fm->id);
197         spin_unlock(&tifm_adapter_lock);
198         if (!rc) {
199                 snprintf(fm->cdev.class_id, BUS_ID_SIZE, "tifm%u", fm->id);
200                 rc = class_device_add(&fm->cdev);
201
202                 if (rc) {
203                         spin_lock(&tifm_adapter_lock);
204                         idr_remove(&tifm_adapter_idr, fm->id);
205                         spin_unlock(&tifm_adapter_lock);
206                 }
207         }
208         return rc;
209 }
210 EXPORT_SYMBOL(tifm_add_adapter);
211
212 void tifm_remove_adapter(struct tifm_adapter *fm)
213 {
214         flush_workqueue(workqueue);
215         class_device_del(&fm->cdev);
216
217         spin_lock(&tifm_adapter_lock);
218         idr_remove(&tifm_adapter_idr, fm->id);
219         spin_unlock(&tifm_adapter_lock);
220 }
221 EXPORT_SYMBOL(tifm_remove_adapter);
222
223 void tifm_free_device(struct device *dev)
224 {
225         struct tifm_dev *fm_dev = container_of(dev, struct tifm_dev, dev);
226         kfree(fm_dev);
227 }
228 EXPORT_SYMBOL(tifm_free_device);
229
230 struct tifm_dev *tifm_alloc_device(struct tifm_adapter *fm)
231 {
232         struct tifm_dev *dev = kzalloc(sizeof(struct tifm_dev), GFP_KERNEL);
233
234         if (dev) {
235                 spin_lock_init(&dev->lock);
236
237                 dev->dev.parent = fm->dev;
238                 dev->dev.bus = &tifm_bus_type;
239                 dev->dev.release = tifm_free_device;
240                 dev->card_event = tifm_dummy_event;
241                 dev->data_event = tifm_dummy_event;
242         }
243         return dev;
244 }
245 EXPORT_SYMBOL(tifm_alloc_device);
246
247 void tifm_eject(struct tifm_dev *sock)
248 {
249         struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
250         fm->eject(fm, sock);
251 }
252 EXPORT_SYMBOL(tifm_eject);
253
254 int tifm_map_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
255                 int direction)
256 {
257         return pci_map_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
258 }
259 EXPORT_SYMBOL(tifm_map_sg);
260
261 void tifm_unmap_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
262                    int direction)
263 {
264         pci_unmap_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
265 }
266 EXPORT_SYMBOL(tifm_unmap_sg);
267
268 void tifm_queue_work(struct work_struct *work)
269 {
270         queue_work(workqueue, work);
271 }
272 EXPORT_SYMBOL(tifm_queue_work);
273
274 int tifm_register_driver(struct tifm_driver *drv)
275 {
276         drv->driver.bus = &tifm_bus_type;
277
278         return driver_register(&drv->driver);
279 }
280 EXPORT_SYMBOL(tifm_register_driver);
281
282 void tifm_unregister_driver(struct tifm_driver *drv)
283 {
284         driver_unregister(&drv->driver);
285 }
286 EXPORT_SYMBOL(tifm_unregister_driver);
287
288 static int __init tifm_init(void)
289 {
290         int rc;
291
292         workqueue = create_freezeable_workqueue("tifm");
293         if (!workqueue)
294                 return -ENOMEM;
295
296         rc = bus_register(&tifm_bus_type);
297
298         if (rc)
299                 goto err_out_wq;
300
301         rc = class_register(&tifm_adapter_class);
302         if (!rc)
303                 return 0;
304
305         bus_unregister(&tifm_bus_type);
306
307 err_out_wq:
308         destroy_workqueue(workqueue);
309
310         return rc;
311 }
312
313 static void __exit tifm_exit(void)
314 {
315         class_unregister(&tifm_adapter_class);
316         bus_unregister(&tifm_bus_type);
317         destroy_workqueue(workqueue);
318 }
319
320 subsys_initcall(tifm_init);
321 module_exit(tifm_exit);
322
323 MODULE_LICENSE("GPL");
324 MODULE_AUTHOR("Alex Dubov");
325 MODULE_DESCRIPTION("TI FlashMedia core driver");
326 MODULE_LICENSE("GPL");
327 MODULE_VERSION(DRIVER_VERSION);