summaryrefslogtreecommitdiff
path: root/drivers/mmc/mmc_sysfs.c
blob: e0e82d849d5f06bab805179033b89ee36f2351c7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
/*
 *  linux/drivers/mmc/mmc_sysfs.c
 *
 *  Copyright (C) 2003 Russell King, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  MMC sysfs/driver model support.
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/idr.h>
#include <linux/workqueue.h>

#include <linux/mmc/card.h>
#include <linux/mmc/host.h>

#include "mmc.h"

#define dev_to_mmc_card(d)	container_of(d, struct mmc_card, dev)
#define to_mmc_driver(d)	container_of(d, struct mmc_driver, drv)
#define cls_dev_to_mmc_host(d)	container_of(d, struct mmc_host, class_dev)

#define MMC_ATTR(name, fmt, args...)					\
static ssize_t mmc_##name##_show (struct device *dev, struct device_attribute *attr, char *buf)	\
{									\
	struct mmc_card *card = dev_to_mmc_card(dev);			\
	return sprintf(buf, fmt, args);					\
}

MMC_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
	card->raw_cid[2], card->raw_cid[3]);
MMC_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
	card->raw_csd[2], card->raw_csd[3]);
MMC_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
MMC_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
MMC_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
MMC_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
MMC_ATTR(manfid, "0x%06x\n", card->cid.manfid);
MMC_ATTR(name, "%s\n", card->cid.prod_name);
MMC_ATTR(oemid, "0x%04x\n", card->cid.oemid);
MMC_ATTR(serial, "0x%08x\n", card->cid.serial);

#define MMC_ATTR_RO(name) __ATTR(name, S_IRUGO, mmc_##name##_show, NULL)

static struct device_attribute mmc_dev_attrs[] = {
	MMC_ATTR_RO(cid),
	MMC_ATTR_RO(csd),
	MMC_ATTR_RO(date),
	MMC_ATTR_RO(fwrev),
	MMC_ATTR_RO(hwrev),
	MMC_ATTR_RO(manfid),
	MMC_ATTR_RO(name),
	MMC_ATTR_RO(oemid),
	MMC_ATTR_RO(serial),
	__ATTR_NULL
};

static struct device_attribute mmc_dev_attr_scr = MMC_ATTR_RO(scr);


static void mmc_release_card(struct device *dev)
{
	struct mmc_card *card = dev_to_mmc_card(dev);

	kfree(card);
}

/*
 * This currently matches any MMC driver to any MMC card - drivers
 * themselves make the decision whether to drive this card in their
 * probe method.  However, we force "bad" cards to fail.
 */
static int mmc_bus_match(struct device *dev, struct device_driver *drv)
{
	struct mmc_card *card = dev_to_mmc_card(dev);
	return !mmc_card_bad(card);
}

static int
mmc_bus_uevent(struct device *dev, char **envp, int num_envp, char *buf,
		int buf_size)
{
	struct mmc_card *card = dev_to_mmc_card(dev);
	char ccc[13];
	int retval = 0, i = 0, length = 0;

#define add_env(fmt,val) do {					\
	retval = add_uevent_var(envp, num_envp, &i,		\
				buf, buf_size, &length,		\
				fmt, val);			\
	if (retval)						\
		return retval;					\
} while (0);

	for (i = 0; i < 12; i++)
		ccc[i] = card->csd.cmdclass & (1 << i) ? '1' : '0';
	ccc[12] = '\0';

	add_env("MMC_CCC=%s", ccc);
	add_env("MMC_MANFID=%06x", card->cid.manfid);
	add_env("MMC_NAME=%s", mmc_card_name(card));
	add_env("MMC_OEMID=%04x", card->cid.oemid);
#undef add_env
	envp[i] = NULL;

	return 0;
}

static int mmc_bus_suspend(struct device *dev, pm_message_t state)
{
	struct mmc_driver *drv = to_mmc_driver(dev->driver);
	struct mmc_card *card = dev_to_mmc_card(dev);
	int ret = 0;

	if (dev->driver && drv->suspend)
		ret = drv->suspend(card, state);
	return ret;
}

static int mmc_bus_resume(struct device *dev)
{
	struct mmc_driver *drv = to_mmc_driver(dev->driver);
	struct mmc_card *card = dev_to_mmc_card(dev);
	int ret = 0;

	if (dev->driver && drv->resume)
		ret = drv->resume(card);
	return ret;
}

static int mmc_bus_probe(struct device *dev)
{
	struct mmc_driver *drv = to_mmc_driver(dev->driver);
	struct mmc_card *card = dev_to_mmc_card(dev);

	return drv->probe(card);
}

static int mmc_bus_remove(struct device *dev)
{
	struct mmc_driver *drv = to_mmc_driver(dev->driver);
	struct mmc_card *card = dev_to_mmc_card(dev);

	drv->remove(card);

	return 0;
}

static struct bus_type mmc_bus_type = {
	.name		= "mmc",
	.dev_attrs	= mmc_dev_attrs,
	.match		= mmc_bus_match,
	.uevent		= mmc_bus_uevent,
	.probe		= mmc_bus_probe,
	.remove		= mmc_bus_remove,
	.suspend	= mmc_bus_suspend,
	.resume		= mmc_bus_resume,
};

/**
 *	mmc_register_driver - register a media driver
 *	@drv: MMC media driver
 */
int mmc_register_driver(struct mmc_driver *drv)
{
	drv->drv.bus = &mmc_bus_type;
	return driver_register(&drv->drv);
}

EXPORT_SYMBOL(mmc_register_driver);

/**
 *	mmc_unregister_driver - unregister a media driver
 *	@drv: MMC media driver
 */
void mmc_unregister_driver(struct mmc_driver *drv)
{
	drv->drv.bus = &mmc_bus_type;
	driver_unregister(&drv->drv);
}

EXPORT_SYMBOL(mmc_unregister_driver);


/*
 * Internal function.  Initialise a MMC card structure.
 */
void mmc_init_card(struct mmc_card *card, struct mmc_host *host)
{
	memset(card, 0, sizeof(struct mmc_card));
	card->host = host;
	device_initialize(&card->dev);
	card->dev.parent = mmc_classdev(host);
	card->dev.bus = &mmc_bus_type;
	card->dev.release = mmc_release_card;
}

/*
 * Internal function.  Register a new MMC card with the driver model.
 */
int mmc_register_card(struct mmc_card *card)
{
	int ret;

	snprintf(card->dev.bus_id, sizeof(card->dev.bus_id),
		 "%s:%04x", mmc_hostname(card->host), card->rca);

	ret = device_add(&card->dev);
	if (ret == 0) {
		if (mmc_card_sd(card)) {
			ret = device_create_file(&card->dev, &mmc_dev_attr_scr);
			if (ret)
				device_del(&card->dev);
		}
	}
	return ret;
}

/*
 * Internal function.  Unregister a new MMC card with the
 * driver model, and (eventually) free it.
 */
void mmc_remove_card(struct mmc_card *card)
{
	if (mmc_card_present(card)) {
		if (mmc_card_sd(card))
			device_remove_file(&card->dev, &mmc_dev_attr_scr);

		device_del(&card->dev);
	}

	put_device(&card->dev);
}


static void mmc_host_classdev_release(struct device *dev)
{
	struct mmc_host *host = cls_dev_to_mmc_host(dev);
	kfree(host);
}

static struct class mmc_host_class = {
	.name		= "mmc_host",
	.dev_release	= mmc_host_classdev_release,
};

static DEFINE_IDR(mmc_host_idr);
static DEFINE_SPINLOCK(mmc_host_lock);

/*
 * Internal function. Allocate a new MMC host.
 */
struct mmc_host *mmc_alloc_host_sysfs(int extra, struct device *dev)
{
	struct mmc_host *host;

	host = kmalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
	if (host) {
		memset(host, 0, sizeof(struct mmc_host) + extra);

		host->parent = dev;
		host->class_dev.parent = dev;
		host->class_dev.class = &mmc_host_class;
		device_initialize(&host->class_dev);
	}

	return host;
}

/*
 * Internal function. Register a new MMC host with the MMC class.
 */
int mmc_add_host_sysfs(struct mmc_host *host)
{
	int err;

	if (!idr_pre_get(&mmc_host_idr, GFP_KERNEL))
		return -ENOMEM;

	spin_lock(&mmc_host_lock);
	err = idr_get_new(&mmc_host_idr, host, &host->index);
	spin_unlock(&mmc_host_lock);
	if (err)
		return err;

	snprintf(host->class_dev.bus_id, BUS_ID_SIZE,
		 "mmc%d", host->index);

	return device_add(&host->class_dev);
}

/*
 * Internal function. Unregister a MMC host with the MMC class.
 */
void mmc_remove_host_sysfs(struct mmc_host *host)
{
	device_del(&host->class_dev);

	spin_lock(&mmc_host_lock);
	idr_remove(&mmc_host_idr, host->index);
	spin_unlock(&mmc_host_lock);
}

/*
 * Internal function. Free a MMC host.
 */
void mmc_free_host_sysfs(struct mmc_host *host)
{
	put_device(&host->class_dev);
}

static struct workqueue_struct *workqueue;

/*
 * Internal function. Schedule delayed work in the MMC work queue.
 */
int mmc_schedule_delayed_work(struct delayed_work *work, unsigned long delay)
{
	return queue_delayed_work(workqueue, work, delay);
}

/*
 * Internal function. Flush all scheduled work from the MMC work queue.
 */
void mmc_flush_scheduled_work(void)
{
	flush_workqueue(workqueue);
}

static int __init mmc_init(void)
{
	int ret;

	workqueue = create_singlethread_workqueue("kmmcd");
	if (!workqueue)
		return -ENOMEM;

	ret = bus_register(&mmc_bus_type);
	if (ret == 0) {
		ret = class_register(&mmc_host_class);
		if (ret)
			bus_unregister(&mmc_bus_type);
	}
	return ret;
}

static void __exit mmc_exit(void)
{
	class_unregister(&mmc_host_class);
	bus_unregister(&mmc_bus_type);
	destroy_workqueue(workqueue);
}

module_init(mmc_init);
module_exit(mmc_exit);