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 
21 static struct workqueue_struct *workqueue;
22 static DEFINE_IDR(tifm_adapter_idr);
23 static DEFINE_SPINLOCK(tifm_adapter_lock);
24 
tifm_media_type_name(unsigned char type,unsigned char nt)25 static 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 
tifm_dev_match(struct tifm_dev * sock,struct tifm_device_id * id)38 static 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 
tifm_bus_match(struct device * dev,struct device_driver * drv)45 static 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 
tifm_uevent(struct device * dev,struct kobj_uevent_env * env)62 static 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 
tifm_device_probe(struct device * dev)72 static 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 
tifm_dummy_event(struct tifm_dev * sock)89 static void tifm_dummy_event(struct tifm_dev *sock)
90 {
91 	return;
92 }
93 
tifm_device_remove(struct device * dev)94 static 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 
tifm_device_suspend(struct device * dev,pm_message_t state)113 static 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 
tifm_device_resume(struct device * dev)124 static 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 
type_show(struct device * dev,struct device_attribute * attr,char * buf)142 static 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 static DEVICE_ATTR_RO(type);
149 
150 static struct attribute *tifm_dev_attrs[] = {
151 	&dev_attr_type.attr,
152 	NULL,
153 };
154 ATTRIBUTE_GROUPS(tifm_dev);
155 
156 static 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 
tifm_free(struct device * dev)167 static 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 
174 static struct class tifm_adapter_class = {
175 	.name    = "tifm_adapter",
176 	.dev_release = tifm_free
177 };
178 
tifm_alloc_adapter(unsigned int num_sockets,struct device * dev)179 struct 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 }
195 EXPORT_SYMBOL(tifm_alloc_adapter);
196 
tifm_add_adapter(struct tifm_adapter * fm)197 int 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 }
221 EXPORT_SYMBOL(tifm_add_adapter);
222 
tifm_remove_adapter(struct tifm_adapter * fm)223 void 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 }
238 EXPORT_SYMBOL(tifm_remove_adapter);
239 
tifm_free_adapter(struct tifm_adapter * fm)240 void tifm_free_adapter(struct tifm_adapter *fm)
241 {
242 	put_device(&fm->dev);
243 }
244 EXPORT_SYMBOL(tifm_free_adapter);
245 
tifm_free_device(struct device * dev)246 void tifm_free_device(struct device *dev)
247 {
248 	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
249 	kfree(sock);
250 }
251 EXPORT_SYMBOL(tifm_free_device);
252 
tifm_alloc_device(struct tifm_adapter * fm,unsigned int id,unsigned char type)253 struct 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 }
282 EXPORT_SYMBOL(tifm_alloc_device);
283 
tifm_eject(struct tifm_dev * sock)284 void tifm_eject(struct tifm_dev *sock)
285 {
286 	struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
287 	fm->eject(fm, sock);
288 }
289 EXPORT_SYMBOL(tifm_eject);
290 
tifm_has_ms_pif(struct tifm_dev * sock)291 int 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 }
296 EXPORT_SYMBOL(tifm_has_ms_pif);
297 
tifm_map_sg(struct tifm_dev * sock,struct scatterlist * sg,int nents,int direction)298 int 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 }
303 EXPORT_SYMBOL(tifm_map_sg);
304 
tifm_unmap_sg(struct tifm_dev * sock,struct scatterlist * sg,int nents,int direction)305 void 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 }
310 EXPORT_SYMBOL(tifm_unmap_sg);
311 
tifm_queue_work(struct work_struct * work)312 void tifm_queue_work(struct work_struct *work)
313 {
314 	queue_work(workqueue, work);
315 }
316 EXPORT_SYMBOL(tifm_queue_work);
317 
tifm_register_driver(struct tifm_driver * drv)318 int tifm_register_driver(struct tifm_driver *drv)
319 {
320 	drv->driver.bus = &tifm_bus_type;
321 
322 	return driver_register(&drv->driver);
323 }
324 EXPORT_SYMBOL(tifm_register_driver);
325 
tifm_unregister_driver(struct tifm_driver * drv)326 void tifm_unregister_driver(struct tifm_driver *drv)
327 {
328 	driver_unregister(&drv->driver);
329 }
330 EXPORT_SYMBOL(tifm_unregister_driver);
331 
tifm_init(void)332 static 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 
351 err_out_wq:
352 	destroy_workqueue(workqueue);
353 
354 	return rc;
355 }
356 
tifm_exit(void)357 static void __exit tifm_exit(void)
358 {
359 	class_unregister(&tifm_adapter_class);
360 	bus_unregister(&tifm_bus_type);
361 	destroy_workqueue(workqueue);
362 }
363 
364 subsys_initcall(tifm_init);
365 module_exit(tifm_exit);
366 
367 MODULE_LICENSE("GPL");
368 MODULE_AUTHOR("Alex Dubov");
369 MODULE_DESCRIPTION("TI FlashMedia core driver");
370 MODULE_LICENSE("GPL");
371 MODULE_VERSION(DRIVER_VERSION);
372