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/slab.h>
14#include <linux/init.h>
15#include <linux/idr.h>
16#include <linux/module.h>
17
18#define DRIVER_NAME "tifm_core"
19#define DRIVER_VERSION "0.8"
20
21static struct workqueue_struct *workqueue;
22static DEFINE_IDR(tifm_adapter_idr);
23static DEFINE_SPINLOCK(tifm_adapter_lock);
24
25static const char *tifm_media_type_name(unsigned char type, unsigned char nt)
26{
27	const char *card_type_name[3][3] = {
28		{ "SmartMedia/xD", "MemoryStick", "MMC/SD" },
29		{ "XD", "MS", "SD"},
30		{ "xd", "ms", "sd"}
31	};
32
33	if (nt > 2 || type < 1 || type > 3)
34		return NULL;
35	return card_type_name[nt][type - 1];
36}
37
38static int tifm_dev_match(struct tifm_dev *sock, struct tifm_device_id *id)
39{
40	if (sock->type == id->type)
41		return 1;
42	return 0;
43}
44
45static int tifm_bus_match(struct device *dev, struct device_driver *drv)
46{
47	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
48	struct tifm_driver *fm_drv = container_of(drv, struct tifm_driver,
49						  driver);
50	struct tifm_device_id *ids = fm_drv->id_table;
51
52	if (ids) {
53		while (ids->type) {
54			if (tifm_dev_match(sock, ids))
55				return 1;
56			++ids;
57		}
58	}
59	return 0;
60}
61
62static int tifm_uevent(struct device *dev, struct kobj_uevent_env *env)
63{
64	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
65
66	if (add_uevent_var(env, "TIFM_CARD_TYPE=%s", tifm_media_type_name(sock->type, 1)))
67		return -ENOMEM;
68
69	return 0;
70}
71
72static int tifm_device_probe(struct device *dev)
73{
74	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
75	struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
76					       driver);
77	int rc = -ENODEV;
78
79	get_device(dev);
80	if (dev->driver && drv->probe) {
81		rc = drv->probe(sock);
82		if (!rc)
83			return 0;
84	}
85	put_device(dev);
86	return rc;
87}
88
89static void tifm_dummy_event(struct tifm_dev *sock)
90{
91	return;
92}
93
94static int tifm_device_remove(struct device *dev)
95{
96	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
97	struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
98					       driver);
99
100	if (dev->driver && drv->remove) {
101		sock->card_event = tifm_dummy_event;
102		sock->data_event = tifm_dummy_event;
103		drv->remove(sock);
104		sock->dev.driver = NULL;
105	}
106
107	put_device(dev);
108	return 0;
109}
110
111#ifdef CONFIG_PM
112
113static int tifm_device_suspend(struct device *dev, pm_message_t state)
114{
115	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
116	struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
117					       driver);
118
119	if (dev->driver && drv->suspend)
120		return drv->suspend(sock, state);
121	return 0;
122}
123
124static int tifm_device_resume(struct device *dev)
125{
126	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
127	struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
128					       driver);
129
130	if (dev->driver && drv->resume)
131		return drv->resume(sock);
132	return 0;
133}
134
135#else
136
137#define tifm_device_suspend NULL
138#define tifm_device_resume NULL
139
140#endif /* CONFIG_PM */
141
142static ssize_t type_show(struct device *dev, struct device_attribute *attr,
143			 char *buf)
144{
145	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
146	return sprintf(buf, "%x", sock->type);
147}
148static DEVICE_ATTR_RO(type);
149
150static struct attribute *tifm_dev_attrs[] = {
151	&dev_attr_type.attr,
152	NULL,
153};
154ATTRIBUTE_GROUPS(tifm_dev);
155
156static struct bus_type tifm_bus_type = {
157	.name      = "tifm",
158	.dev_groups = tifm_dev_groups,
159	.match     = tifm_bus_match,
160	.uevent    = tifm_uevent,
161	.probe     = tifm_device_probe,
162	.remove    = tifm_device_remove,
163	.suspend   = tifm_device_suspend,
164	.resume    = tifm_device_resume
165};
166
167static void tifm_free(struct device *dev)
168{
169	struct tifm_adapter *fm = container_of(dev, struct tifm_adapter, dev);
170
171	kfree(fm);
172}
173
174static struct class tifm_adapter_class = {
175	.name    = "tifm_adapter",
176	.dev_release = tifm_free
177};
178
179struct tifm_adapter *tifm_alloc_adapter(unsigned int num_sockets,
180					struct device *dev)
181{
182	struct tifm_adapter *fm;
183
184	fm = kzalloc(sizeof(struct tifm_adapter)
185		     + sizeof(struct tifm_dev*) * num_sockets, GFP_KERNEL);
186	if (fm) {
187		fm->dev.class = &tifm_adapter_class;
188		fm->dev.parent = dev;
189		device_initialize(&fm->dev);
190		spin_lock_init(&fm->lock);
191		fm->num_sockets = num_sockets;
192	}
193	return fm;
194}
195EXPORT_SYMBOL(tifm_alloc_adapter);
196
197int tifm_add_adapter(struct tifm_adapter *fm)
198{
199	int rc;
200
201	idr_preload(GFP_KERNEL);
202	spin_lock(&tifm_adapter_lock);
203	rc = idr_alloc(&tifm_adapter_idr, fm, 0, 0, GFP_NOWAIT);
204	if (rc >= 0)
205		fm->id = rc;
206	spin_unlock(&tifm_adapter_lock);
207	idr_preload_end();
208	if (rc < 0)
209		return rc;
210
211	dev_set_name(&fm->dev, "tifm%u", fm->id);
212	rc = device_add(&fm->dev);
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}
221EXPORT_SYMBOL(tifm_add_adapter);
222
223void 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	device_del(&fm->dev);
237}
238EXPORT_SYMBOL(tifm_remove_adapter);
239
240void tifm_free_adapter(struct tifm_adapter *fm)
241{
242	put_device(&fm->dev);
243}
244EXPORT_SYMBOL(tifm_free_adapter);
245
246void tifm_free_device(struct device *dev)
247{
248	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
249	kfree(sock);
250}
251EXPORT_SYMBOL(tifm_free_device);
252
253struct 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->dev.parent;
270		sock->dev.bus = &tifm_bus_type;
271		sock->dev.dma_mask = fm->dev.parent->dma_mask;
272		sock->dev.release = tifm_free_device;
273
274		dev_set_name(&sock->dev, "tifm_%s%u:%u",
275			     tifm_media_type_name(type, 2), fm->id, id);
276		printk(KERN_INFO DRIVER_NAME
277		       ": %s card detected in socket %u:%u\n",
278		       tifm_media_type_name(type, 0), fm->id, id);
279	}
280	return sock;
281}
282EXPORT_SYMBOL(tifm_alloc_device);
283
284void tifm_eject(struct tifm_dev *sock)
285{
286	struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
287	fm->eject(fm, sock);
288}
289EXPORT_SYMBOL(tifm_eject);
290
291int tifm_has_ms_pif(struct tifm_dev *sock)
292{
293	struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
294	return fm->has_ms_pif(fm, sock);
295}
296EXPORT_SYMBOL(tifm_has_ms_pif);
297
298int tifm_map_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
299		int direction)
300{
301	return pci_map_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
302}
303EXPORT_SYMBOL(tifm_map_sg);
304
305void tifm_unmap_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
306		   int direction)
307{
308	pci_unmap_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
309}
310EXPORT_SYMBOL(tifm_unmap_sg);
311
312void tifm_queue_work(struct work_struct *work)
313{
314	queue_work(workqueue, work);
315}
316EXPORT_SYMBOL(tifm_queue_work);
317
318int tifm_register_driver(struct tifm_driver *drv)
319{
320	drv->driver.bus = &tifm_bus_type;
321
322	return driver_register(&drv->driver);
323}
324EXPORT_SYMBOL(tifm_register_driver);
325
326void tifm_unregister_driver(struct tifm_driver *drv)
327{
328	driver_unregister(&drv->driver);
329}
330EXPORT_SYMBOL(tifm_unregister_driver);
331
332static int __init tifm_init(void)
333{
334	int rc;
335
336	workqueue = create_freezable_workqueue("tifm");
337	if (!workqueue)
338		return -ENOMEM;
339
340	rc = bus_register(&tifm_bus_type);
341
342	if (rc)
343		goto err_out_wq;
344
345	rc = class_register(&tifm_adapter_class);
346	if (!rc)
347		return 0;
348
349	bus_unregister(&tifm_bus_type);
350
351err_out_wq:
352	destroy_workqueue(workqueue);
353
354	return rc;
355}
356
357static void __exit tifm_exit(void)
358{
359	class_unregister(&tifm_adapter_class);
360	bus_unregister(&tifm_bus_type);
361	destroy_workqueue(workqueue);
362}
363
364subsys_initcall(tifm_init);
365module_exit(tifm_exit);
366
367MODULE_LICENSE("GPL");
368MODULE_AUTHOR("Alex Dubov");
369MODULE_DESCRIPTION("TI FlashMedia core driver");
370MODULE_LICENSE("GPL");
371MODULE_VERSION(DRIVER_VERSION);
372