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