8f77949f93dd879097604fcc817122bfcef60fbc
[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, struct kobj_uevent_env *env)
61 {
62         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
63
64         if (add_uevent_var(env, "TIFM_CARD_TYPE=%s", tifm_media_type_name(sock->type, 1)))
65                 return -ENOMEM;
66
67         return 0;
68 }
69
70 static int tifm_device_probe(struct device *dev)
71 {
72         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
73         struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
74                                                driver);
75         int rc = -ENODEV;
76
77         get_device(dev);
78         if (dev->driver && drv->probe) {
79                 rc = drv->probe(sock);
80                 if (!rc)
81                         return 0;
82         }
83         put_device(dev);
84         return rc;
85 }
86
87 static void tifm_dummy_event(struct tifm_dev *sock)
88 {
89         return;
90 }
91
92 static int tifm_device_remove(struct device *dev)
93 {
94         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
95         struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
96                                                driver);
97
98         if (dev->driver && drv->remove) {
99                 sock->card_event = tifm_dummy_event;
100                 sock->data_event = tifm_dummy_event;
101                 drv->remove(sock);
102                 sock->dev.driver = NULL;
103         }
104
105         put_device(dev);
106         return 0;
107 }
108
109 #ifdef CONFIG_PM
110
111 static int tifm_device_suspend(struct device *dev, pm_message_t state)
112 {
113         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
114         struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
115                                                driver);
116
117         if (dev->driver && drv->suspend)
118                 return drv->suspend(sock, state);
119         return 0;
120 }
121
122 static int tifm_device_resume(struct device *dev)
123 {
124         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
125         struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
126                                                driver);
127
128         if (dev->driver && drv->resume)
129                 return drv->resume(sock);
130         return 0;
131 }
132
133 #else
134
135 #define tifm_device_suspend NULL
136 #define tifm_device_resume NULL
137
138 #endif /* CONFIG_PM */
139
140 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
141                          char *buf)
142 {
143         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
144         return sprintf(buf, "%x", sock->type);
145 }
146
147 static struct device_attribute tifm_dev_attrs[] = {
148         __ATTR(type, S_IRUGO, type_show, NULL),
149         __ATTR_NULL
150 };
151
152 static struct bus_type tifm_bus_type = {
153         .name      = "tifm",
154         .dev_attrs = tifm_dev_attrs,
155         .match     = tifm_bus_match,
156         .uevent    = tifm_uevent,
157         .probe     = tifm_device_probe,
158         .remove    = tifm_device_remove,
159         .suspend   = tifm_device_suspend,
160         .resume    = tifm_device_resume
161 };
162
163 static void tifm_free(struct class_device *cdev)
164 {
165         struct tifm_adapter *fm = container_of(cdev, struct tifm_adapter, cdev);
166
167         kfree(fm);
168 }
169
170 static struct class tifm_adapter_class = {
171         .name    = "tifm_adapter",
172         .release = tifm_free
173 };
174
175 struct tifm_adapter *tifm_alloc_adapter(unsigned int num_sockets,
176                                         struct device *dev)
177 {
178         struct tifm_adapter *fm;
179
180         fm = kzalloc(sizeof(struct tifm_adapter)
181                      + sizeof(struct tifm_dev*) * num_sockets, GFP_KERNEL);
182         if (fm) {
183                 fm->cdev.class = &tifm_adapter_class;
184                 fm->cdev.dev = dev;
185                 class_device_initialize(&fm->cdev);
186                 spin_lock_init(&fm->lock);
187                 fm->num_sockets = num_sockets;
188         }
189         return fm;
190 }
191 EXPORT_SYMBOL(tifm_alloc_adapter);
192
193 int tifm_add_adapter(struct tifm_adapter *fm)
194 {
195         int rc;
196
197         if (!idr_pre_get(&tifm_adapter_idr, GFP_KERNEL))
198                 return -ENOMEM;
199
200         spin_lock(&tifm_adapter_lock);
201         rc = idr_get_new(&tifm_adapter_idr, fm, &fm->id);
202         spin_unlock(&tifm_adapter_lock);
203         if (rc)
204                 return rc;
205
206         snprintf(fm->cdev.class_id, BUS_ID_SIZE, "tifm%u", fm->id);
207         rc = class_device_add(&fm->cdev);
208         if (rc) {
209                 spin_lock(&tifm_adapter_lock);
210                 idr_remove(&tifm_adapter_idr, fm->id);
211                 spin_unlock(&tifm_adapter_lock);
212         }
213
214         return rc;
215 }
216 EXPORT_SYMBOL(tifm_add_adapter);
217
218 void tifm_remove_adapter(struct tifm_adapter *fm)
219 {
220         unsigned int cnt;
221
222         flush_workqueue(workqueue);
223         for (cnt = 0; cnt < fm->num_sockets; ++cnt) {
224                 if (fm->sockets[cnt])
225                         device_unregister(&fm->sockets[cnt]->dev);
226         }
227
228         spin_lock(&tifm_adapter_lock);
229         idr_remove(&tifm_adapter_idr, fm->id);
230         spin_unlock(&tifm_adapter_lock);
231         class_device_del(&fm->cdev);
232 }
233 EXPORT_SYMBOL(tifm_remove_adapter);
234
235 void tifm_free_adapter(struct tifm_adapter *fm)
236 {
237         class_device_put(&fm->cdev);
238 }
239 EXPORT_SYMBOL(tifm_free_adapter);
240
241 void tifm_free_device(struct device *dev)
242 {
243         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
244         kfree(sock);
245 }
246 EXPORT_SYMBOL(tifm_free_device);
247
248 struct tifm_dev *tifm_alloc_device(struct tifm_adapter *fm, unsigned int id,
249                                    unsigned char type)
250 {
251         struct tifm_dev *sock = NULL;
252
253         if (!tifm_media_type_name(type, 0))
254                 return sock;
255
256         sock = kzalloc(sizeof(struct tifm_dev), GFP_KERNEL);
257         if (sock) {
258                 spin_lock_init(&sock->lock);
259                 sock->type = type;
260                 sock->socket_id = id;
261                 sock->card_event = tifm_dummy_event;
262                 sock->data_event = tifm_dummy_event;
263
264                 sock->dev.parent = fm->cdev.dev;
265                 sock->dev.bus = &tifm_bus_type;
266                 sock->dev.dma_mask = fm->cdev.dev->dma_mask;
267                 sock->dev.release = tifm_free_device;
268
269                 snprintf(sock->dev.bus_id, BUS_ID_SIZE,
270                          "tifm_%s%u:%u", tifm_media_type_name(type, 2),
271                          fm->id, id);
272                 printk(KERN_INFO DRIVER_NAME
273                        ": %s card detected in socket %u:%u\n",
274                        tifm_media_type_name(type, 0), fm->id, id);
275         }
276         return sock;
277 }
278 EXPORT_SYMBOL(tifm_alloc_device);
279
280 void tifm_eject(struct tifm_dev *sock)
281 {
282         struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
283         fm->eject(fm, sock);
284 }
285 EXPORT_SYMBOL(tifm_eject);
286
287 int tifm_map_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
288                 int direction)
289 {
290         return pci_map_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
291 }
292 EXPORT_SYMBOL(tifm_map_sg);
293
294 void tifm_unmap_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
295                    int direction)
296 {
297         pci_unmap_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
298 }
299 EXPORT_SYMBOL(tifm_unmap_sg);
300
301 void tifm_queue_work(struct work_struct *work)
302 {
303         queue_work(workqueue, work);
304 }
305 EXPORT_SYMBOL(tifm_queue_work);
306
307 int tifm_register_driver(struct tifm_driver *drv)
308 {
309         drv->driver.bus = &tifm_bus_type;
310
311         return driver_register(&drv->driver);
312 }
313 EXPORT_SYMBOL(tifm_register_driver);
314
315 void tifm_unregister_driver(struct tifm_driver *drv)
316 {
317         driver_unregister(&drv->driver);
318 }
319 EXPORT_SYMBOL(tifm_unregister_driver);
320
321 static int __init tifm_init(void)
322 {
323         int rc;
324
325         workqueue = create_freezeable_workqueue("tifm");
326         if (!workqueue)
327                 return -ENOMEM;
328
329         rc = bus_register(&tifm_bus_type);
330
331         if (rc)
332                 goto err_out_wq;
333
334         rc = class_register(&tifm_adapter_class);
335         if (!rc)
336                 return 0;
337
338         bus_unregister(&tifm_bus_type);
339
340 err_out_wq:
341         destroy_workqueue(workqueue);
342
343         return rc;
344 }
345
346 static void __exit tifm_exit(void)
347 {
348         class_unregister(&tifm_adapter_class);
349         bus_unregister(&tifm_bus_type);
350         destroy_workqueue(workqueue);
351 }
352
353 subsys_initcall(tifm_init);
354 module_exit(tifm_exit);
355
356 MODULE_LICENSE("GPL");
357 MODULE_AUTHOR("Alex Dubov");
358 MODULE_DESCRIPTION("TI FlashMedia core driver");
359 MODULE_LICENSE("GPL");
360 MODULE_VERSION(DRIVER_VERSION);