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}
148
149static struct device_attribute tifm_dev_attrs[] = {
150	__ATTR(type, S_IRUGO, type_show, NULL),
151	__ATTR_NULL
152};
153
154static struct bus_type tifm_bus_type = {
155	.name      = "tifm",
156	.dev_attrs = tifm_dev_attrs,
157	.match     = tifm_bus_match,
158	.uevent    = tifm_uevent,
159	.probe     = tifm_device_probe,
160	.remove    = tifm_device_remove,
161	.suspend   = tifm_device_suspend,
162	.resume    = tifm_device_resume
163};
164
165static void tifm_free(struct device *dev)
166{
167	struct tifm_adapter *fm = container_of(dev, struct tifm_adapter, dev);
168
169	kfree(fm);
170}
171
172static struct class tifm_adapter_class = {
173	.name    = "tifm_adapter",
174	.dev_release = tifm_free
175};
176
177struct tifm_adapter *tifm_alloc_adapter(unsigned int num_sockets,
178					struct device *dev)
179{
180	struct tifm_adapter *fm;
181
182	fm = kzalloc(sizeof(struct tifm_adapter)
183		     + sizeof(struct tifm_dev*) * num_sockets, GFP_KERNEL);
184	if (fm) {
185		fm->dev.class = &tifm_adapter_class;
186		fm->dev.parent = dev;
187		device_initialize(&fm->dev);
188		spin_lock_init(&fm->lock);
189		fm->num_sockets = num_sockets;
190	}
191	return fm;
192}
193EXPORT_SYMBOL(tifm_alloc_adapter);
194
195int tifm_add_adapter(struct tifm_adapter *fm)
196{
197	int rc;
198
199	if (!idr_pre_get(&tifm_adapter_idr, GFP_KERNEL))
200		return -ENOMEM;
201
202	spin_lock(&tifm_adapter_lock);
203	rc = idr_get_new(&tifm_adapter_idr, fm, &fm->id);
204	spin_unlock(&tifm_adapter_lock);
205	if (rc)
206		return rc;
207
208	dev_set_name(&fm->dev, "tifm%u", fm->id);
209	rc = device_add(&fm->dev);
210	if (rc) {
211		spin_lock(&tifm_adapter_lock);
212		idr_remove(&tifm_adapter_idr, fm->id);
213		spin_unlock(&tifm_adapter_lock);
214	}
215
216	return rc;
217}
218EXPORT_SYMBOL(tifm_add_adapter);
219
220void tifm_remove_adapter(struct tifm_adapter *fm)
221{
222	unsigned int cnt;
223
224	flush_workqueue(workqueue);
225	for (cnt = 0; cnt < fm->num_sockets; ++cnt) {
226		if (fm->sockets[cnt])
227			device_unregister(&fm->sockets[cnt]->dev);
228	}
229
230	spin_lock(&tifm_adapter_lock);
231	idr_remove(&tifm_adapter_idr, fm->id);
232	spin_unlock(&tifm_adapter_lock);
233	device_del(&fm->dev);
234}
235EXPORT_SYMBOL(tifm_remove_adapter);
236
237void tifm_free_adapter(struct tifm_adapter *fm)
238{
239	put_device(&fm->dev);
240}
241EXPORT_SYMBOL(tifm_free_adapter);
242
243void tifm_free_device(struct device *dev)
244{
245	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
246	kfree(sock);
247}
248EXPORT_SYMBOL(tifm_free_device);
249
250struct tifm_dev *tifm_alloc_device(struct tifm_adapter *fm, unsigned int id,
251				   unsigned char type)
252{
253	struct tifm_dev *sock = NULL;
254
255	if (!tifm_media_type_name(type, 0))
256		return sock;
257
258	sock = kzalloc(sizeof(struct tifm_dev), GFP_KERNEL);
259	if (sock) {
260		spin_lock_init(&sock->lock);
261		sock->type = type;
262		sock->socket_id = id;
263		sock->card_event = tifm_dummy_event;
264		sock->data_event = tifm_dummy_event;
265
266		sock->dev.parent = fm->dev.parent;
267		sock->dev.bus = &tifm_bus_type;
268		sock->dev.dma_mask = fm->dev.parent->dma_mask;
269		sock->dev.release = tifm_free_device;
270
271		dev_set_name(&sock->dev, "tifm_%s%u:%u",
272			     tifm_media_type_name(type, 2), fm->id, id);
273		printk(KERN_INFO DRIVER_NAME
274		       ": %s card detected in socket %u:%u\n",
275		       tifm_media_type_name(type, 0), fm->id, id);
276	}
277	return sock;
278}
279EXPORT_SYMBOL(tifm_alloc_device);
280
281void tifm_eject(struct tifm_dev *sock)
282{
283	struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
284	fm->eject(fm, sock);
285}
286EXPORT_SYMBOL(tifm_eject);
287
288int tifm_has_ms_pif(struct tifm_dev *sock)
289{
290	struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
291	return fm->has_ms_pif(fm, sock);
292}
293EXPORT_SYMBOL(tifm_has_ms_pif);
294
295int tifm_map_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
296		int direction)
297{
298	return pci_map_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
299}
300EXPORT_SYMBOL(tifm_map_sg);
301
302void tifm_unmap_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
303		   int direction)
304{
305	pci_unmap_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
306}
307EXPORT_SYMBOL(tifm_unmap_sg);
308
309void tifm_queue_work(struct work_struct *work)
310{
311	queue_work(workqueue, work);
312}
313EXPORT_SYMBOL(tifm_queue_work);
314
315int tifm_register_driver(struct tifm_driver *drv)
316{
317	drv->driver.bus = &tifm_bus_type;
318
319	return driver_register(&drv->driver);
320}
321EXPORT_SYMBOL(tifm_register_driver);
322
323void tifm_unregister_driver(struct tifm_driver *drv)
324{
325	driver_unregister(&drv->driver);
326}
327EXPORT_SYMBOL(tifm_unregister_driver);
328
329static int __init tifm_init(void)
330{
331	int rc;
332
333	workqueue = create_freezable_workqueue("tifm");
334	if (!workqueue)
335		return -ENOMEM;
336
337	rc = bus_register(&tifm_bus_type);
338
339	if (rc)
340		goto err_out_wq;
341
342	rc = class_register(&tifm_adapter_class);
343	if (!rc)
344		return 0;
345
346	bus_unregister(&tifm_bus_type);
347
348err_out_wq:
349	destroy_workqueue(workqueue);
350
351	return rc;
352}
353
354static void __exit tifm_exit(void)
355{
356	class_unregister(&tifm_adapter_class);
357	bus_unregister(&tifm_bus_type);
358	destroy_workqueue(workqueue);
359}
360
361subsys_initcall(tifm_init);
362module_exit(tifm_exit);
363
364MODULE_LICENSE("GPL");
365MODULE_AUTHOR("Alex Dubov");
366MODULE_DESCRIPTION("TI FlashMedia core driver");
367MODULE_LICENSE("GPL");
368MODULE_VERSION(DRIVER_VERSION);
369