10cc9734eaa0ea56187259b2947bf7d42931c9bf
[linux-3.10.git] / drivers / mmc / mmc_sysfs.c
1 /*
2  *  linux/drivers/mmc/mmc_sysfs.c
3  *
4  *  Copyright (C) 2003 Russell King, All Rights Reserved.
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  *  MMC sysfs/driver model support.
11  */
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/device.h>
15 #include <linux/idr.h>
16 #include <linux/workqueue.h>
17
18 #include <linux/mmc/card.h>
19 #include <linux/mmc/host.h>
20
21 #include "mmc.h"
22
23 #define dev_to_mmc_card(d)      container_of(d, struct mmc_card, dev)
24 #define to_mmc_driver(d)        container_of(d, struct mmc_driver, drv)
25 #define cls_dev_to_mmc_host(d)  container_of(d, struct mmc_host, class_dev)
26
27 #define MMC_ATTR(name, fmt, args...)                                    \
28 static ssize_t mmc_##name##_show (struct device *dev, struct device_attribute *attr, char *buf) \
29 {                                                                       \
30         struct mmc_card *card = dev_to_mmc_card(dev);                   \
31         return sprintf(buf, fmt, args);                                 \
32 }
33
34 MMC_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
35         card->raw_cid[2], card->raw_cid[3]);
36 MMC_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
37         card->raw_csd[2], card->raw_csd[3]);
38 MMC_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
39 MMC_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
40 MMC_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
41 MMC_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
42 MMC_ATTR(manfid, "0x%06x\n", card->cid.manfid);
43 MMC_ATTR(name, "%s\n", card->cid.prod_name);
44 MMC_ATTR(oemid, "0x%04x\n", card->cid.oemid);
45 MMC_ATTR(serial, "0x%08x\n", card->cid.serial);
46
47 #define MMC_ATTR_RO(name) __ATTR(name, S_IRUGO, mmc_##name##_show, NULL)
48
49 static struct device_attribute mmc_dev_attrs[] = {
50         MMC_ATTR_RO(cid),
51         MMC_ATTR_RO(csd),
52         MMC_ATTR_RO(date),
53         MMC_ATTR_RO(fwrev),
54         MMC_ATTR_RO(hwrev),
55         MMC_ATTR_RO(manfid),
56         MMC_ATTR_RO(name),
57         MMC_ATTR_RO(oemid),
58         MMC_ATTR_RO(serial),
59         __ATTR_NULL
60 };
61
62 static struct device_attribute mmc_dev_attr_scr = MMC_ATTR_RO(scr);
63
64
65 static void mmc_release_card(struct device *dev)
66 {
67         struct mmc_card *card = dev_to_mmc_card(dev);
68
69         kfree(card);
70 }
71
72 /*
73  * This currently matches any MMC driver to any MMC card - drivers
74  * themselves make the decision whether to drive this card in their
75  * probe method.  However, we force "bad" cards to fail.
76  */
77 static int mmc_bus_match(struct device *dev, struct device_driver *drv)
78 {
79         struct mmc_card *card = dev_to_mmc_card(dev);
80         return !mmc_card_bad(card);
81 }
82
83 static int
84 mmc_bus_uevent(struct device *dev, char **envp, int num_envp, char *buf,
85                 int buf_size)
86 {
87         struct mmc_card *card = dev_to_mmc_card(dev);
88         char ccc[13];
89         int i = 0;
90
91 #define add_env(fmt,val)                                                \
92         ({                                                              \
93                 int len, ret = -ENOMEM;                                 \
94                 if (i < num_envp) {                                     \
95                         envp[i++] = buf;                                \
96                         len = snprintf(buf, buf_size, fmt, val) + 1;    \
97                         buf_size -= len;                                \
98                         buf += len;                                     \
99                         if (buf_size >= 0)                              \
100                                 ret = 0;                                \
101                 }                                                       \
102                 ret;                                                    \
103         })
104
105         for (i = 0; i < 12; i++)
106                 ccc[i] = card->csd.cmdclass & (1 << i) ? '1' : '0';
107         ccc[12] = '\0';
108
109         i = 0;
110         add_env("MMC_CCC=%s", ccc);
111         add_env("MMC_MANFID=%06x", card->cid.manfid);
112         add_env("MMC_NAME=%s", mmc_card_name(card));
113         add_env("MMC_OEMID=%04x", card->cid.oemid);
114
115         return 0;
116 }
117
118 static int mmc_bus_suspend(struct device *dev, pm_message_t state)
119 {
120         struct mmc_driver *drv = to_mmc_driver(dev->driver);
121         struct mmc_card *card = dev_to_mmc_card(dev);
122         int ret = 0;
123
124         if (dev->driver && drv->suspend)
125                 ret = drv->suspend(card, state);
126         return ret;
127 }
128
129 static int mmc_bus_resume(struct device *dev)
130 {
131         struct mmc_driver *drv = to_mmc_driver(dev->driver);
132         struct mmc_card *card = dev_to_mmc_card(dev);
133         int ret = 0;
134
135         if (dev->driver && drv->resume)
136                 ret = drv->resume(card);
137         return ret;
138 }
139
140 static int mmc_bus_probe(struct device *dev)
141 {
142         struct mmc_driver *drv = to_mmc_driver(dev->driver);
143         struct mmc_card *card = dev_to_mmc_card(dev);
144
145         return drv->probe(card);
146 }
147
148 static int mmc_bus_remove(struct device *dev)
149 {
150         struct mmc_driver *drv = to_mmc_driver(dev->driver);
151         struct mmc_card *card = dev_to_mmc_card(dev);
152
153         drv->remove(card);
154
155         return 0;
156 }
157
158 static struct bus_type mmc_bus_type = {
159         .name           = "mmc",
160         .dev_attrs      = mmc_dev_attrs,
161         .match          = mmc_bus_match,
162         .uevent         = mmc_bus_uevent,
163         .probe          = mmc_bus_probe,
164         .remove         = mmc_bus_remove,
165         .suspend        = mmc_bus_suspend,
166         .resume         = mmc_bus_resume,
167 };
168
169 /**
170  *      mmc_register_driver - register a media driver
171  *      @drv: MMC media driver
172  */
173 int mmc_register_driver(struct mmc_driver *drv)
174 {
175         drv->drv.bus = &mmc_bus_type;
176         return driver_register(&drv->drv);
177 }
178
179 EXPORT_SYMBOL(mmc_register_driver);
180
181 /**
182  *      mmc_unregister_driver - unregister a media driver
183  *      @drv: MMC media driver
184  */
185 void mmc_unregister_driver(struct mmc_driver *drv)
186 {
187         drv->drv.bus = &mmc_bus_type;
188         driver_unregister(&drv->drv);
189 }
190
191 EXPORT_SYMBOL(mmc_unregister_driver);
192
193
194 /*
195  * Internal function.  Initialise a MMC card structure.
196  */
197 void mmc_init_card(struct mmc_card *card, struct mmc_host *host)
198 {
199         memset(card, 0, sizeof(struct mmc_card));
200         card->host = host;
201         device_initialize(&card->dev);
202         card->dev.parent = card->host->dev;
203         card->dev.bus = &mmc_bus_type;
204         card->dev.release = mmc_release_card;
205 }
206
207 /*
208  * Internal function.  Register a new MMC card with the driver model.
209  */
210 int mmc_register_card(struct mmc_card *card)
211 {
212         int ret;
213
214         snprintf(card->dev.bus_id, sizeof(card->dev.bus_id),
215                  "%s:%04x", mmc_hostname(card->host), card->rca);
216
217         ret = device_add(&card->dev);
218         if (ret == 0) {
219                 if (mmc_card_sd(card)) {
220                         ret = device_create_file(&card->dev, &mmc_dev_attr_scr);
221                         if (ret)
222                                 device_del(&card->dev);
223                 }
224         }
225         return ret;
226 }
227
228 /*
229  * Internal function.  Unregister a new MMC card with the
230  * driver model, and (eventually) free it.
231  */
232 void mmc_remove_card(struct mmc_card *card)
233 {
234         if (mmc_card_present(card)) {
235                 if (mmc_card_sd(card))
236                         device_remove_file(&card->dev, &mmc_dev_attr_scr);
237
238                 device_del(&card->dev);
239         }
240
241         put_device(&card->dev);
242 }
243
244
245 static void mmc_host_classdev_release(struct class_device *dev)
246 {
247         struct mmc_host *host = cls_dev_to_mmc_host(dev);
248         kfree(host);
249 }
250
251 static struct class mmc_host_class = {
252         .name           = "mmc_host",
253         .release        = mmc_host_classdev_release,
254 };
255
256 static DEFINE_IDR(mmc_host_idr);
257 static DEFINE_SPINLOCK(mmc_host_lock);
258
259 /*
260  * Internal function. Allocate a new MMC host.
261  */
262 struct mmc_host *mmc_alloc_host_sysfs(int extra, struct device *dev)
263 {
264         struct mmc_host *host;
265
266         host = kmalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
267         if (host) {
268                 memset(host, 0, sizeof(struct mmc_host) + extra);
269
270                 host->dev = dev;
271                 host->class_dev.dev = host->dev;
272                 host->class_dev.class = &mmc_host_class;
273                 class_device_initialize(&host->class_dev);
274         }
275
276         return host;
277 }
278
279 /*
280  * Internal function. Register a new MMC host with the MMC class.
281  */
282 int mmc_add_host_sysfs(struct mmc_host *host)
283 {
284         int err;
285
286         if (!idr_pre_get(&mmc_host_idr, GFP_KERNEL))
287                 return -ENOMEM;
288
289         spin_lock(&mmc_host_lock);
290         err = idr_get_new(&mmc_host_idr, host, &host->index);
291         spin_unlock(&mmc_host_lock);
292         if (err)
293                 return err;
294
295         snprintf(host->class_dev.class_id, BUS_ID_SIZE,
296                  "mmc%d", host->index);
297
298         return class_device_add(&host->class_dev);
299 }
300
301 /*
302  * Internal function. Unregister a MMC host with the MMC class.
303  */
304 void mmc_remove_host_sysfs(struct mmc_host *host)
305 {
306         class_device_del(&host->class_dev);
307
308         spin_lock(&mmc_host_lock);
309         idr_remove(&mmc_host_idr, host->index);
310         spin_unlock(&mmc_host_lock);
311 }
312
313 /*
314  * Internal function. Free a MMC host.
315  */
316 void mmc_free_host_sysfs(struct mmc_host *host)
317 {
318         class_device_put(&host->class_dev);
319 }
320
321 static struct workqueue_struct *workqueue;
322
323 /*
324  * Internal function. Schedule work in the MMC work queue.
325  */
326 int mmc_schedule_work(struct work_struct *work)
327 {
328         return queue_work(workqueue, work);
329 }
330
331 /*
332  * Internal function. Schedule delayed work in the MMC work queue.
333  */
334 int mmc_schedule_delayed_work(struct work_struct *work, unsigned long delay)
335 {
336         return queue_delayed_work(workqueue, work, delay);
337 }
338
339 /*
340  * Internal function. Flush all scheduled work from the MMC work queue.
341  */
342 void mmc_flush_scheduled_work(void)
343 {
344         flush_workqueue(workqueue);
345 }
346
347 static int __init mmc_init(void)
348 {
349         int ret;
350
351         workqueue = create_singlethread_workqueue("kmmcd");
352         if (!workqueue)
353                 return -ENOMEM;
354
355         ret = bus_register(&mmc_bus_type);
356         if (ret == 0) {
357                 ret = class_register(&mmc_host_class);
358                 if (ret)
359                         bus_unregister(&mmc_bus_type);
360         }
361         return ret;
362 }
363
364 static void __exit mmc_exit(void)
365 {
366         class_unregister(&mmc_host_class);
367         bus_unregister(&mmc_bus_type);
368         destroy_workqueue(workqueue);
369 }
370
371 module_init(mmc_init);
372 module_exit(mmc_exit);