[PATCH] V4L: 899: fix rds raw data buffer handling bug which caused
[linux-2.6] / 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
17 #include <linux/mmc/card.h>
18 #include <linux/mmc/host.h>
19
20 #include "mmc.h"
21
22 #define dev_to_mmc_card(d)      container_of(d, struct mmc_card, dev)
23 #define to_mmc_driver(d)        container_of(d, struct mmc_driver, drv)
24 #define cls_dev_to_mmc_host(d)  container_of(d, struct mmc_host, class_dev)
25
26 #define MMC_ATTR(name, fmt, args...)                                    \
27 static ssize_t mmc_##name##_show (struct device *dev, struct device_attribute *attr, char *buf) \
28 {                                                                       \
29         struct mmc_card *card = dev_to_mmc_card(dev);                   \
30         return sprintf(buf, fmt, args);                                 \
31 }
32
33 MMC_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
34         card->raw_cid[2], card->raw_cid[3]);
35 MMC_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
36         card->raw_csd[2], card->raw_csd[3]);
37 MMC_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
38 MMC_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
39 MMC_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
40 MMC_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
41 MMC_ATTR(manfid, "0x%06x\n", card->cid.manfid);
42 MMC_ATTR(name, "%s\n", card->cid.prod_name);
43 MMC_ATTR(oemid, "0x%04x\n", card->cid.oemid);
44 MMC_ATTR(serial, "0x%08x\n", card->cid.serial);
45
46 #define MMC_ATTR_RO(name) __ATTR(name, S_IRUGO, mmc_##name##_show, NULL)
47
48 static struct device_attribute mmc_dev_attrs[] = {
49         MMC_ATTR_RO(cid),
50         MMC_ATTR_RO(csd),
51         MMC_ATTR_RO(date),
52         MMC_ATTR_RO(fwrev),
53         MMC_ATTR_RO(hwrev),
54         MMC_ATTR_RO(manfid),
55         MMC_ATTR_RO(name),
56         MMC_ATTR_RO(oemid),
57         MMC_ATTR_RO(serial),
58         __ATTR_NULL
59 };
60
61 static struct device_attribute mmc_dev_attr_scr = MMC_ATTR_RO(scr);
62
63
64 static void mmc_release_card(struct device *dev)
65 {
66         struct mmc_card *card = dev_to_mmc_card(dev);
67
68         kfree(card);
69 }
70
71 /*
72  * This currently matches any MMC driver to any MMC card - drivers
73  * themselves make the decision whether to drive this card in their
74  * probe method.  However, we force "bad" cards to fail.
75  */
76 static int mmc_bus_match(struct device *dev, struct device_driver *drv)
77 {
78         struct mmc_card *card = dev_to_mmc_card(dev);
79         return !mmc_card_bad(card);
80 }
81
82 static int
83 mmc_bus_hotplug(struct device *dev, char **envp, int num_envp, char *buf,
84                 int buf_size)
85 {
86         struct mmc_card *card = dev_to_mmc_card(dev);
87         char ccc[13];
88         int i = 0;
89
90 #define add_env(fmt,val)                                                \
91         ({                                                              \
92                 int len, ret = -ENOMEM;                                 \
93                 if (i < num_envp) {                                     \
94                         envp[i++] = buf;                                \
95                         len = snprintf(buf, buf_size, fmt, val) + 1;    \
96                         buf_size -= len;                                \
97                         buf += len;                                     \
98                         if (buf_size >= 0)                              \
99                                 ret = 0;                                \
100                 }                                                       \
101                 ret;                                                    \
102         })
103
104         for (i = 0; i < 12; i++)
105                 ccc[i] = card->csd.cmdclass & (1 << i) ? '1' : '0';
106         ccc[12] = '\0';
107
108         i = 0;
109         add_env("MMC_CCC=%s", ccc);
110         add_env("MMC_MANFID=%06x", card->cid.manfid);
111         add_env("MMC_NAME=%s", mmc_card_name(card));
112         add_env("MMC_OEMID=%04x", card->cid.oemid);
113
114         return 0;
115 }
116
117 static int mmc_bus_suspend(struct device *dev, pm_message_t state)
118 {
119         struct mmc_driver *drv = to_mmc_driver(dev->driver);
120         struct mmc_card *card = dev_to_mmc_card(dev);
121         int ret = 0;
122
123         if (dev->driver && drv->suspend)
124                 ret = drv->suspend(card, state);
125         return ret;
126 }
127
128 static int mmc_bus_resume(struct device *dev)
129 {
130         struct mmc_driver *drv = to_mmc_driver(dev->driver);
131         struct mmc_card *card = dev_to_mmc_card(dev);
132         int ret = 0;
133
134         if (dev->driver && drv->resume)
135                 ret = drv->resume(card);
136         return ret;
137 }
138
139 static struct bus_type mmc_bus_type = {
140         .name           = "mmc",
141         .dev_attrs      = mmc_dev_attrs,
142         .match          = mmc_bus_match,
143         .hotplug        = mmc_bus_hotplug,
144         .suspend        = mmc_bus_suspend,
145         .resume         = mmc_bus_resume,
146 };
147
148
149 static int mmc_drv_probe(struct device *dev)
150 {
151         struct mmc_driver *drv = to_mmc_driver(dev->driver);
152         struct mmc_card *card = dev_to_mmc_card(dev);
153
154         return drv->probe(card);
155 }
156
157 static int mmc_drv_remove(struct device *dev)
158 {
159         struct mmc_driver *drv = to_mmc_driver(dev->driver);
160         struct mmc_card *card = dev_to_mmc_card(dev);
161
162         drv->remove(card);
163
164         return 0;
165 }
166
167
168 /**
169  *      mmc_register_driver - register a media driver
170  *      @drv: MMC media driver
171  */
172 int mmc_register_driver(struct mmc_driver *drv)
173 {
174         drv->drv.bus = &mmc_bus_type;
175         drv->drv.probe = mmc_drv_probe;
176         drv->drv.remove = mmc_drv_remove;
177         return driver_register(&drv->drv);
178 }
179
180 EXPORT_SYMBOL(mmc_register_driver);
181
182 /**
183  *      mmc_unregister_driver - unregister a media driver
184  *      @drv: MMC media driver
185  */
186 void mmc_unregister_driver(struct mmc_driver *drv)
187 {
188         drv->drv.bus = &mmc_bus_type;
189         driver_unregister(&drv->drv);
190 }
191
192 EXPORT_SYMBOL(mmc_unregister_driver);
193
194
195 /*
196  * Internal function.  Initialise a MMC card structure.
197  */
198 void mmc_init_card(struct mmc_card *card, struct mmc_host *host)
199 {
200         memset(card, 0, sizeof(struct mmc_card));
201         card->host = host;
202         device_initialize(&card->dev);
203         card->dev.parent = card->host->dev;
204         card->dev.bus = &mmc_bus_type;
205         card->dev.release = mmc_release_card;
206 }
207
208 /*
209  * Internal function.  Register a new MMC card with the driver model.
210  */
211 int mmc_register_card(struct mmc_card *card)
212 {
213         int ret;
214
215         snprintf(card->dev.bus_id, sizeof(card->dev.bus_id),
216                  "%s:%04x", mmc_hostname(card->host), card->rca);
217
218         ret = device_add(&card->dev);
219         if (ret == 0) {
220                 if (mmc_card_sd(card)) {
221                         ret = device_create_file(&card->dev, &mmc_dev_attr_scr);
222                         if (ret)
223                                 device_del(&card->dev);
224                 }
225         }
226         return ret;
227 }
228
229 /*
230  * Internal function.  Unregister a new MMC card with the
231  * driver model, and (eventually) free it.
232  */
233 void mmc_remove_card(struct mmc_card *card)
234 {
235         if (mmc_card_present(card)) {
236                 if (mmc_card_sd(card))
237                         device_remove_file(&card->dev, &mmc_dev_attr_scr);
238
239                 device_del(&card->dev);
240         }
241
242         put_device(&card->dev);
243 }
244
245
246 static void mmc_host_classdev_release(struct class_device *dev)
247 {
248         struct mmc_host *host = cls_dev_to_mmc_host(dev);
249         kfree(host);
250 }
251
252 static struct class mmc_host_class = {
253         .name           = "mmc_host",
254         .release        = mmc_host_classdev_release,
255 };
256
257 static DEFINE_IDR(mmc_host_idr);
258 static DEFINE_SPINLOCK(mmc_host_lock);
259
260 /*
261  * Internal function. Allocate a new MMC host.
262  */
263 struct mmc_host *mmc_alloc_host_sysfs(int extra, struct device *dev)
264 {
265         struct mmc_host *host;
266
267         host = kmalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
268         if (host) {
269                 memset(host, 0, sizeof(struct mmc_host) + extra);
270
271                 host->dev = dev;
272                 host->class_dev.dev = host->dev;
273                 host->class_dev.class = &mmc_host_class;
274                 class_device_initialize(&host->class_dev);
275         }
276
277         return host;
278 }
279
280 /*
281  * Internal function. Register a new MMC host with the MMC class.
282  */
283 int mmc_add_host_sysfs(struct mmc_host *host)
284 {
285         int err;
286
287         if (!idr_pre_get(&mmc_host_idr, GFP_KERNEL))
288                 return -ENOMEM;
289
290         spin_lock(&mmc_host_lock);
291         err = idr_get_new(&mmc_host_idr, host, &host->index);
292         spin_unlock(&mmc_host_lock);
293         if (err)
294                 return err;
295
296         snprintf(host->class_dev.class_id, BUS_ID_SIZE,
297                  "mmc%d", host->index);
298
299         return class_device_add(&host->class_dev);
300 }
301
302 /*
303  * Internal function. Unregister a MMC host with the MMC class.
304  */
305 void mmc_remove_host_sysfs(struct mmc_host *host)
306 {
307         class_device_del(&host->class_dev);
308
309         spin_lock(&mmc_host_lock);
310         idr_remove(&mmc_host_idr, host->index);
311         spin_unlock(&mmc_host_lock);
312 }
313
314 /*
315  * Internal function. Free a MMC host.
316  */
317 void mmc_free_host_sysfs(struct mmc_host *host)
318 {
319         class_device_put(&host->class_dev);
320 }
321
322
323 static int __init mmc_init(void)
324 {
325         int ret = bus_register(&mmc_bus_type);
326         if (ret == 0) {
327                 ret = class_register(&mmc_host_class);
328                 if (ret)
329                         bus_unregister(&mmc_bus_type);
330         }
331         return ret;
332 }
333
334 static void __exit mmc_exit(void)
335 {
336         class_unregister(&mmc_host_class);
337         bus_unregister(&mmc_bus_type);
338 }
339
340 module_init(mmc_init);
341 module_exit(mmc_exit);