Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
[linux-2.6] / 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 *sock = 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(sock, state);
124         return 0;
125 }
126
127 static int tifm_device_resume(struct device *dev)
128 {
129         struct tifm_dev *sock = 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(sock);
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 ssize_t type_show(struct device *dev, struct device_attribute *attr,
146                          char *buf)
147 {
148         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
149         return sprintf(buf, "%x", sock->type);
150 }
151
152 static struct device_attribute tifm_dev_attrs[] = {
153         __ATTR(type, S_IRUGO, type_show, NULL),
154         __ATTR_NULL
155 };
156
157 static struct bus_type tifm_bus_type = {
158         .name      = "tifm",
159         .dev_attrs = tifm_dev_attrs,
160         .match     = tifm_bus_match,
161         .uevent    = tifm_uevent,
162         .probe     = tifm_device_probe,
163         .remove    = tifm_device_remove,
164         .suspend   = tifm_device_suspend,
165         .resume    = tifm_device_resume
166 };
167
168 static void tifm_free(struct class_device *cdev)
169 {
170         struct tifm_adapter *fm = container_of(cdev, struct tifm_adapter, cdev);
171
172         kfree(fm);
173 }
174
175 static struct class tifm_adapter_class = {
176         .name    = "tifm_adapter",
177         .release = tifm_free
178 };
179
180 struct tifm_adapter *tifm_alloc_adapter(unsigned int num_sockets,
181                                         struct device *dev)
182 {
183         struct tifm_adapter *fm;
184
185         fm = kzalloc(sizeof(struct tifm_adapter)
186                      + sizeof(struct tifm_dev*) * num_sockets, GFP_KERNEL);
187         if (fm) {
188                 fm->cdev.class = &tifm_adapter_class;
189                 fm->cdev.dev = dev;
190                 class_device_initialize(&fm->cdev);
191                 spin_lock_init(&fm->lock);
192                 fm->num_sockets = num_sockets;
193         }
194         return fm;
195 }
196 EXPORT_SYMBOL(tifm_alloc_adapter);
197
198 int tifm_add_adapter(struct tifm_adapter *fm)
199 {
200         int rc;
201
202         if (!idr_pre_get(&tifm_adapter_idr, GFP_KERNEL))
203                 return -ENOMEM;
204
205         spin_lock(&tifm_adapter_lock);
206         rc = idr_get_new(&tifm_adapter_idr, fm, &fm->id);
207         spin_unlock(&tifm_adapter_lock);
208         if (rc)
209                 return rc;
210
211         snprintf(fm->cdev.class_id, BUS_ID_SIZE, "tifm%u", fm->id);
212         rc = class_device_add(&fm->cdev);
213         if (rc) {
214                 spin_lock(&tifm_adapter_lock);
215                 idr_remove(&tifm_adapter_idr, fm->id);
216                 spin_unlock(&tifm_adapter_lock);
217         }
218
219         return rc;
220 }
221 EXPORT_SYMBOL(tifm_add_adapter);
222
223 void tifm_remove_adapter(struct tifm_adapter *fm)
224 {
225         unsigned int cnt;
226
227         flush_workqueue(workqueue);
228         for (cnt = 0; cnt < fm->num_sockets; ++cnt) {
229                 if (fm->sockets[cnt])
230                         device_unregister(&fm->sockets[cnt]->dev);
231         }
232
233         spin_lock(&tifm_adapter_lock);
234         idr_remove(&tifm_adapter_idr, fm->id);
235         spin_unlock(&tifm_adapter_lock);
236         class_device_del(&fm->cdev);
237 }
238 EXPORT_SYMBOL(tifm_remove_adapter);
239
240 void tifm_free_adapter(struct tifm_adapter *fm)
241 {
242         class_device_put(&fm->cdev);
243 }
244 EXPORT_SYMBOL(tifm_free_adapter);
245
246 void tifm_free_device(struct device *dev)
247 {
248         struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
249         kfree(sock);
250 }
251 EXPORT_SYMBOL(tifm_free_device);
252
253 struct tifm_dev *tifm_alloc_device(struct tifm_adapter *fm, unsigned int id,
254                                    unsigned char type)
255 {
256         struct tifm_dev *sock = NULL;
257
258         if (!tifm_media_type_name(type, 0))
259                 return sock;
260
261         sock = kzalloc(sizeof(struct tifm_dev), GFP_KERNEL);
262         if (sock) {
263                 spin_lock_init(&sock->lock);
264                 sock->type = type;
265                 sock->socket_id = id;
266                 sock->card_event = tifm_dummy_event;
267                 sock->data_event = tifm_dummy_event;
268
269                 sock->dev.parent = fm->cdev.dev;
270                 sock->dev.bus = &tifm_bus_type;
271                 sock->dev.dma_mask = fm->cdev.dev->dma_mask;
272                 sock->dev.release = tifm_free_device;
273
274                 snprintf(sock->dev.bus_id, BUS_ID_SIZE,
275                          "tifm_%s%u:%u", tifm_media_type_name(type, 2),
276                          fm->id, id);
277                 printk(KERN_INFO DRIVER_NAME
278                        ": %s card detected in socket %u:%u\n",
279                        tifm_media_type_name(type, 0), fm->id, id);
280         }
281         return sock;
282 }
283 EXPORT_SYMBOL(tifm_alloc_device);
284
285 void tifm_eject(struct tifm_dev *sock)
286 {
287         struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
288         fm->eject(fm, sock);
289 }
290 EXPORT_SYMBOL(tifm_eject);
291
292 int tifm_map_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
293                 int direction)
294 {
295         return pci_map_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
296 }
297 EXPORT_SYMBOL(tifm_map_sg);
298
299 void tifm_unmap_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
300                    int direction)
301 {
302         pci_unmap_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
303 }
304 EXPORT_SYMBOL(tifm_unmap_sg);
305
306 void tifm_queue_work(struct work_struct *work)
307 {
308         queue_work(workqueue, work);
309 }
310 EXPORT_SYMBOL(tifm_queue_work);
311
312 int tifm_register_driver(struct tifm_driver *drv)
313 {
314         drv->driver.bus = &tifm_bus_type;
315
316         return driver_register(&drv->driver);
317 }
318 EXPORT_SYMBOL(tifm_register_driver);
319
320 void tifm_unregister_driver(struct tifm_driver *drv)
321 {
322         driver_unregister(&drv->driver);
323 }
324 EXPORT_SYMBOL(tifm_unregister_driver);
325
326 static int __init tifm_init(void)
327 {
328         int rc;
329
330         workqueue = create_freezeable_workqueue("tifm");
331         if (!workqueue)
332                 return -ENOMEM;
333
334         rc = bus_register(&tifm_bus_type);
335
336         if (rc)
337                 goto err_out_wq;
338
339         rc = class_register(&tifm_adapter_class);
340         if (!rc)
341                 return 0;
342
343         bus_unregister(&tifm_bus_type);
344
345 err_out_wq:
346         destroy_workqueue(workqueue);
347
348         return rc;
349 }
350
351 static void __exit tifm_exit(void)
352 {
353         class_unregister(&tifm_adapter_class);
354         bus_unregister(&tifm_bus_type);
355         destroy_workqueue(workqueue);
356 }
357
358 subsys_initcall(tifm_init);
359 module_exit(tifm_exit);
360
361 MODULE_LICENSE("GPL");
362 MODULE_AUTHOR("Alex Dubov");
363 MODULE_DESCRIPTION("TI FlashMedia core driver");
364 MODULE_LICENSE("GPL");
365 MODULE_VERSION(DRIVER_VERSION);