tifm: move common adapter management tasks from tifm_7xx1 to tifm_core
[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);
160 }
161
162 static struct class tifm_adapter_class = {
163         .name    = "tifm_adapter",
164         .release = tifm_free
165 };
166
167 struct tifm_adapter *tifm_alloc_adapter(unsigned int num_sockets,
168                                         struct device *dev)
169 {
170         struct tifm_adapter *fm;
171
172         fm = kzalloc(sizeof(struct tifm_adapter)
173                      + sizeof(struct tifm_dev*) * num_sockets, GFP_KERNEL);
174         if (fm) {
175                 fm->cdev.class = &tifm_adapter_class;
176                 fm->cdev.dev = dev;
177                 class_device_initialize(&fm->cdev);
178                 spin_lock_init(&fm->lock);
179                 fm->num_sockets = num_sockets;
180         }
181         return fm;
182 }
183 EXPORT_SYMBOL(tifm_alloc_adapter);
184
185 int tifm_add_adapter(struct tifm_adapter *fm)
186 {
187         int rc;
188
189         if (!idr_pre_get(&tifm_adapter_idr, GFP_KERNEL))
190                 return -ENOMEM;
191
192         spin_lock(&tifm_adapter_lock);
193         rc = idr_get_new(&tifm_adapter_idr, fm, &fm->id);
194         spin_unlock(&tifm_adapter_lock);
195         if (rc)
196                 return rc;
197
198         snprintf(fm->cdev.class_id, BUS_ID_SIZE, "tifm%u", fm->id);
199         rc = class_device_add(&fm->cdev);
200         if (rc) {
201                 spin_lock(&tifm_adapter_lock);
202                 idr_remove(&tifm_adapter_idr, fm->id);
203                 spin_unlock(&tifm_adapter_lock);
204         }
205
206         return rc;
207 }
208 EXPORT_SYMBOL(tifm_add_adapter);
209
210 void tifm_remove_adapter(struct tifm_adapter *fm)
211 {
212         unsigned int cnt;
213
214         flush_workqueue(workqueue);
215         for (cnt = 0; cnt < fm->num_sockets; ++cnt) {
216                 if (fm->sockets[cnt])
217                         device_unregister(&fm->sockets[cnt]->dev);
218         }
219
220         spin_lock(&tifm_adapter_lock);
221         idr_remove(&tifm_adapter_idr, fm->id);
222         spin_unlock(&tifm_adapter_lock);
223         class_device_del(&fm->cdev);
224 }
225 EXPORT_SYMBOL(tifm_remove_adapter);
226
227 void tifm_free_adapter(struct tifm_adapter *fm)
228 {
229         class_device_put(&fm->cdev);
230 }
231 EXPORT_SYMBOL(tifm_free_adapter);
232
233 void tifm_free_device(struct device *dev)
234 {
235         struct tifm_dev *fm_dev = container_of(dev, struct tifm_dev, dev);
236         kfree(fm_dev);
237 }
238 EXPORT_SYMBOL(tifm_free_device);
239
240 struct tifm_dev *tifm_alloc_device(struct tifm_adapter *fm)
241 {
242         struct tifm_dev *dev = kzalloc(sizeof(struct tifm_dev), GFP_KERNEL);
243
244         if (dev) {
245                 spin_lock_init(&dev->lock);
246
247                 dev->dev.parent = fm->cdev.dev;
248                 dev->dev.bus = &tifm_bus_type;
249                 dev->dev.release = tifm_free_device;
250                 dev->card_event = tifm_dummy_event;
251                 dev->data_event = tifm_dummy_event;
252         }
253         return dev;
254 }
255 EXPORT_SYMBOL(tifm_alloc_device);
256
257 void tifm_eject(struct tifm_dev *sock)
258 {
259         struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
260         fm->eject(fm, sock);
261 }
262 EXPORT_SYMBOL(tifm_eject);
263
264 int tifm_map_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
265                 int direction)
266 {
267         return pci_map_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
268 }
269 EXPORT_SYMBOL(tifm_map_sg);
270
271 void tifm_unmap_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
272                    int direction)
273 {
274         pci_unmap_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
275 }
276 EXPORT_SYMBOL(tifm_unmap_sg);
277
278 void tifm_queue_work(struct work_struct *work)
279 {
280         queue_work(workqueue, work);
281 }
282 EXPORT_SYMBOL(tifm_queue_work);
283
284 int tifm_register_driver(struct tifm_driver *drv)
285 {
286         drv->driver.bus = &tifm_bus_type;
287
288         return driver_register(&drv->driver);
289 }
290 EXPORT_SYMBOL(tifm_register_driver);
291
292 void tifm_unregister_driver(struct tifm_driver *drv)
293 {
294         driver_unregister(&drv->driver);
295 }
296 EXPORT_SYMBOL(tifm_unregister_driver);
297
298 static int __init tifm_init(void)
299 {
300         int rc;
301
302         workqueue = create_freezeable_workqueue("tifm");
303         if (!workqueue)
304                 return -ENOMEM;
305
306         rc = bus_register(&tifm_bus_type);
307
308         if (rc)
309                 goto err_out_wq;
310
311         rc = class_register(&tifm_adapter_class);
312         if (!rc)
313                 return 0;
314
315         bus_unregister(&tifm_bus_type);
316
317 err_out_wq:
318         destroy_workqueue(workqueue);
319
320         return rc;
321 }
322
323 static void __exit tifm_exit(void)
324 {
325         class_unregister(&tifm_adapter_class);
326         bus_unregister(&tifm_bus_type);
327         destroy_workqueue(workqueue);
328 }
329
330 subsys_initcall(tifm_init);
331 module_exit(tifm_exit);
332
333 MODULE_LICENSE("GPL");
334 MODULE_AUTHOR("Alex Dubov");
335 MODULE_DESCRIPTION("TI FlashMedia core driver");
336 MODULE_LICENSE("GPL");
337 MODULE_VERSION(DRIVER_VERSION);