misc: nct1008: Refactor power rail control
[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/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         if (!idr_pre_get(&tifm_adapter_idr, GFP_KERNEL))
200                 return -ENOMEM;
201
202         spin_lock(&tifm_adapter_lock);
203         rc = idr_get_new(&tifm_adapter_idr, fm, &fm->id);
204         spin_unlock(&tifm_adapter_lock);
205         if (rc)
206                 return rc;
207
208         dev_set_name(&fm->dev, "tifm%u", fm->id);
209         rc = device_add(&fm->dev);
210         if (rc) {
211                 spin_lock(&tifm_adapter_lock);
212                 idr_remove(&tifm_adapter_idr, fm->id);
213                 spin_unlock(&tifm_adapter_lock);
214         }
215
216         return rc;
217 }
218 EXPORT_SYMBOL(tifm_add_adapter);
219
220 void tifm_remove_adapter(struct tifm_adapter *fm)
221 {
222         unsigned int cnt;
223
224         flush_workqueue(workqueue);
225         for (cnt = 0; cnt < fm->num_sockets; ++cnt) {
226                 if (fm->sockets[cnt])
227                         device_unregister(&fm->sockets[cnt]->dev);
228         }
229
230         spin_lock(&tifm_adapter_lock);
231         idr_remove(&tifm_adapter_idr, fm->id);
232         spin_unlock(&tifm_adapter_lock);
233         device_del(&fm->dev);
234 }
235 EXPORT_SYMBOL(tifm_remove_adapter);
236
237 void tifm_free_adapter(struct tifm_adapter *fm)
238 {
239         put_device(&fm->dev);
240 }
241 EXPORT_SYMBOL(tifm_free_adapter);
242
243 void tifm_free_device(struct device *dev)
244 {
245         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
246         kfree(sock);
247 }
248 EXPORT_SYMBOL(tifm_free_device);
249
250 struct tifm_dev *tifm_alloc_device(struct tifm_adapter *fm, unsigned int id,
251                                    unsigned char type)
252 {
253         struct tifm_dev *sock = NULL;
254
255         if (!tifm_media_type_name(type, 0))
256                 return sock;
257
258         sock = kzalloc(sizeof(struct tifm_dev), GFP_KERNEL);
259         if (sock) {
260                 spin_lock_init(&sock->lock);
261                 sock->type = type;
262                 sock->socket_id = id;
263                 sock->card_event = tifm_dummy_event;
264                 sock->data_event = tifm_dummy_event;
265
266                 sock->dev.parent = fm->dev.parent;
267                 sock->dev.bus = &tifm_bus_type;
268                 sock->dev.dma_mask = fm->dev.parent->dma_mask;
269                 sock->dev.release = tifm_free_device;
270
271                 dev_set_name(&sock->dev, "tifm_%s%u:%u",
272                              tifm_media_type_name(type, 2), fm->id, id);
273                 printk(KERN_INFO DRIVER_NAME
274                        ": %s card detected in socket %u:%u\n",
275                        tifm_media_type_name(type, 0), fm->id, id);
276         }
277         return sock;
278 }
279 EXPORT_SYMBOL(tifm_alloc_device);
280
281 void tifm_eject(struct tifm_dev *sock)
282 {
283         struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
284         fm->eject(fm, sock);
285 }
286 EXPORT_SYMBOL(tifm_eject);
287
288 int tifm_has_ms_pif(struct tifm_dev *sock)
289 {
290         struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
291         return fm->has_ms_pif(fm, sock);
292 }
293 EXPORT_SYMBOL(tifm_has_ms_pif);
294
295 int tifm_map_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
296                 int direction)
297 {
298         return pci_map_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
299 }
300 EXPORT_SYMBOL(tifm_map_sg);
301
302 void tifm_unmap_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
303                    int direction)
304 {
305         pci_unmap_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
306 }
307 EXPORT_SYMBOL(tifm_unmap_sg);
308
309 void tifm_queue_work(struct work_struct *work)
310 {
311         queue_work(workqueue, work);
312 }
313 EXPORT_SYMBOL(tifm_queue_work);
314
315 int tifm_register_driver(struct tifm_driver *drv)
316 {
317         drv->driver.bus = &tifm_bus_type;
318
319         return driver_register(&drv->driver);
320 }
321 EXPORT_SYMBOL(tifm_register_driver);
322
323 void tifm_unregister_driver(struct tifm_driver *drv)
324 {
325         driver_unregister(&drv->driver);
326 }
327 EXPORT_SYMBOL(tifm_unregister_driver);
328
329 static int __init tifm_init(void)
330 {
331         int rc;
332
333         workqueue = create_freezable_workqueue("tifm");
334         if (!workqueue)
335                 return -ENOMEM;
336
337         rc = bus_register(&tifm_bus_type);
338
339         if (rc)
340                 goto err_out_wq;
341
342         rc = class_register(&tifm_adapter_class);
343         if (!rc)
344                 return 0;
345
346         bus_unregister(&tifm_bus_type);
347
348 err_out_wq:
349         destroy_workqueue(workqueue);
350
351         return rc;
352 }
353
354 static void __exit tifm_exit(void)
355 {
356         class_unregister(&tifm_adapter_class);
357         bus_unregister(&tifm_bus_type);
358         destroy_workqueue(workqueue);
359 }
360
361 subsys_initcall(tifm_init);
362 module_exit(tifm_exit);
363
364 MODULE_LICENSE("GPL");
365 MODULE_AUTHOR("Alex Dubov");
366 MODULE_DESCRIPTION("TI FlashMedia core driver");
367 MODULE_LICENSE("GPL");
368 MODULE_VERSION(DRIVER_VERSION);