aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/misc/tifm_core.c
blob: 8f77949f93dd879097604fcc817122bfcef60fbc (plain) (blame)
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
360
/*
 *  tifm_core.c - TI FlashMedia driver
 *
 *  Copyright (C) 2006 Alex Dubov <oakad@yahoo.com>
 *
 * 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.
 *
 */

#include <linux/tifm.h>
#include <linux/init.h>
#include <linux/idr.h>

#define DRIVER_NAME "tifm_core"
#define DRIVER_VERSION "0.8"

static struct workqueue_struct *workqueue;
static DEFINE_IDR(tifm_adapter_idr);
static DEFINE_SPINLOCK(tifm_adapter_lock);

static const char *tifm_media_type_name(unsigned char type, unsigned char nt)
{
	const char *card_type_name[3][3] = {
		{ "SmartMedia/xD", "MemoryStick", "MMC/SD" },
		{ "XD", "MS", "SD"},
		{ "xd", "ms", "sd"}
	};

	if (nt > 2 || type < 1 || type > 3)
		return NULL;
	return card_type_name[nt][type - 1];
}

static int tifm_dev_match(struct tifm_dev *sock, struct tifm_device_id *id)
{
	if (sock->type == id->type)
		return 1;
	return 0;
}

static int tifm_bus_match(struct device *dev, struct device_driver *drv)
{
	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
	struct tifm_driver *fm_drv = container_of(drv, struct tifm_driver,
						  driver);
	struct tifm_device_id *ids = fm_drv->id_table;

	if (ids) {
		while (ids->type) {
			if (tifm_dev_match(sock, ids))
				return 1;
			++ids;
		}
	}
	return 0;
}

static int tifm_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);

	if (add_uevent_var(env, "TIFM_CARD_TYPE=%s", tifm_media_type_name(sock->type, 1)))
		return -ENOMEM;

	return 0;
}

static int tifm_device_probe(struct device *dev)
{
	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
	struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
					       driver);
	int rc = -ENODEV;

	get_device(dev);
	if (dev->driver && drv->probe) {
		rc = drv->probe(sock);
		if (!rc)
			return 0;
	}
	put_device(dev);
	return rc;
}

static void tifm_dummy_event(struct tifm_dev *sock)
{
	return;
}

static int tifm_device_remove(struct device *dev)
{
	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
	struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
					       driver);

	if (dev->driver && drv->remove) {
		sock->card_event = tifm_dummy_event;
		sock->data_event = tifm_dummy_event;
		drv->remove(sock);
		sock->dev.driver = NULL;
	}

	put_device(dev);
	return 0;
}

#ifdef CONFIG_PM

static int tifm_device_suspend(struct device *dev, pm_message_t state)
{
	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
	struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
					       driver);

	if (dev->driver && drv->suspend)
		return drv->suspend(sock, state);
	return 0;
}

static int tifm_device_resume(struct device *dev)
{
	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
	struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
					       driver);

	if (dev->driver && drv->resume)
		return drv->resume(sock);
	return 0;
}

#else

#define tifm_device_suspend NULL
#define tifm_device_resume NULL

#endif /* CONFIG_PM */

static ssize_t type_show(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
	return sprintf(buf, "%x", sock->type);
}

static struct device_attribute tifm_dev_attrs[] = {
	__ATTR(type, S_IRUGO, type_show, NULL),
	__ATTR_NULL
};

static struct bus_type tifm_bus_type = {
	.name      = "tifm",
	.dev_attrs = tifm_dev_attrs,
	.match     = tifm_bus_match,
	.uevent    = tifm_uevent,
	.probe     = tifm_device_probe,
	.remove    = tifm_device_remove,
	.suspend   = tifm_device_suspend,
	.resume    = tifm_device_resume
};

static void tifm_free(struct class_device *cdev)
{
	struct tifm_adapter *fm = container_of(cdev, struct tifm_adapter, cdev);

	kfree(fm);
}

static struct class tifm_adapter_class = {
	.name    = "tifm_adapter",
	.release = tifm_free
};

struct tifm_adapter *tifm_alloc_adapter(unsigned int num_sockets,
					struct device *dev)
{
	struct tifm_adapter *fm;

	fm = kzalloc(sizeof(struct tifm_adapter)
		     + sizeof(struct tifm_dev*) * num_sockets, GFP_KERNEL);
	if (fm) {
		fm->cdev.class = &tifm_adapter_class;
		fm->cdev.dev = dev;
		class_device_initialize(&fm->cdev);
		spin_lock_init(&fm->lock);
		fm->num_sockets = num_sockets;
	}
	return fm;
}
EXPORT_SYMBOL(tifm_alloc_adapter);

int tifm_add_adapter(struct tifm_adapter *fm)
{
	int rc;

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

	spin_lock(&tifm_adapter_lock);
	rc = idr_get_new(&tifm_adapter_idr, fm, &fm->id);
	spin_unlock(&tifm_adapter_lock);
	if (rc)
		return rc;

	snprintf(fm->cdev.class_id, BUS_ID_SIZE, "tifm%u", fm->id);
	rc = class_device_add(&fm->cdev);
	if (rc) {
		spin_lock(&tifm_adapter_lock);
		idr_remove(&tifm_adapter_idr, fm->id);
		spin_unlock(&tifm_adapter_lock);
	}

	return rc;
}
EXPORT_SYMBOL(tifm_add_adapter);

void tifm_remove_adapter(struct tifm_adapter *fm)
{
	unsigned int cnt;

	flush_workqueue(workqueue);
	for (cnt = 0; cnt < fm->num_sockets; ++cnt) {
		if (fm->sockets[cnt])
			device_unregister(&fm->sockets[cnt]->dev);
	}

	spin_lock(&tifm_adapter_lock);
	idr_remove(&tifm_adapter_idr, fm->id);
	spin_unlock(&tifm_adapter_lock);
	class_device_del(&fm->cdev);
}
EXPORT_SYMBOL(tifm_remove_adapter);

void tifm_free_adapter(struct tifm_adapter *fm)
{
	class_device_put(&fm->cdev);
}
EXPORT_SYMBOL(tifm_free_adapter);

void tifm_free_device(struct device *dev)
{
	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
	kfree(sock);
}
EXPORT_SYMBOL(tifm_free_device);

struct tifm_dev *tifm_alloc_device(struct tifm_adapter *fm, unsigned int id,
				   unsigned char type)
{
	struct tifm_dev *sock = NULL;

	if (!tifm_media_type_name(type, 0))
		return sock;

	sock = kzalloc(sizeof(struct tifm_dev), GFP_KERNEL);
	if (sock) {
		spin_lock_init(&sock->lock);
		sock->type = type;
		sock->socket_id = id;
		sock->card_event = tifm_dummy_event;
		sock->data_event = tifm_dummy_event;

		sock->dev.parent = fm->cdev.dev;
		sock->dev.bus = &tifm_bus_type;
		sock->dev.dma_mask = fm->cdev.dev->dma_mask;
		sock->dev.release = tifm_free_device;

		snprintf(sock->dev.bus_id, BUS_ID_SIZE,
			 "tifm_%s%u:%u", tifm_media_type_name(type, 2),
			 fm->id, id);
		printk(KERN_INFO DRIVER_NAME
		       ": %s card detected in socket %u:%u\n",
		       tifm_media_type_name(type, 0), fm->id, id);
	}
	return sock;
}
EXPORT_SYMBOL(tifm_alloc_device);

void tifm_eject(struct tifm_dev *sock)
{
	struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
	fm->eject(fm, sock);
}
EXPORT_SYMBOL(tifm_eject);

int tifm_map_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
		int direction)
{
	return pci_map_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
}
EXPORT_SYMBOL(tifm_map_sg);

void tifm_unmap_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
		   int direction)
{
	pci_unmap_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
}
EXPORT_SYMBOL(tifm_unmap_sg);

void tifm_queue_work(struct work_struct *work)
{
	queue_work(workqueue, work);
}
EXPORT_SYMBOL(tifm_queue_work);

int tifm_register_driver(struct tifm_driver *drv)
{
	drv->driver.bus = &tifm_bus_type;

	return driver_register(&drv->driver);
}
EXPORT_SYMBOL(tifm_register_driver);

void tifm_unregister_driver(struct tifm_driver *drv)
{
	driver_unregister(&drv->driver);
}
EXPORT_SYMBOL(tifm_unregister_driver);

static int __init tifm_init(void)
{
	int rc;

	workqueue = create_freezeable_workqueue("tifm");
	if (!workqueue)
		return -ENOMEM;

	rc = bus_register(&tifm_bus_type);

	if (rc)
		goto err_out_wq;

	rc = class_register(&tifm_adapter_class);
	if (!rc)
		return 0;

	bus_unregister(&tifm_bus_type);

err_out_wq:
	destroy_workqueue(workqueue);

	return rc;
}

static void __exit tifm_exit(void)
{
	class_unregister(&tifm_adapter_class);
	bus_unregister(&tifm_bus_type);
	destroy_workqueue(workqueue);
}

subsys_initcall(tifm_init);
module_exit(tifm_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Alex Dubov");
MODULE_DESCRIPTION("TI FlashMedia core driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRIVER_VERSION);