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