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 
149 static struct device_attribute tifm_dev_attrs[] = {
150 	__ATTR(type, S_IRUGO, type_show, NULL),
151 	__ATTR_NULL
152 };
153 
154 static 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 
tifm_free(struct device * dev)165 static 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 
172 static struct class tifm_adapter_class = {
173 	.name    = "tifm_adapter",
174 	.dev_release = tifm_free
175 };
176 
tifm_alloc_adapter(unsigned int num_sockets,struct device * dev)177 struct 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 }
193 EXPORT_SYMBOL(tifm_alloc_adapter);
194 
tifm_add_adapter(struct tifm_adapter * fm)195 int 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 }
218 EXPORT_SYMBOL(tifm_add_adapter);
219 
tifm_remove_adapter(struct tifm_adapter * fm)220 void 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 }
235 EXPORT_SYMBOL(tifm_remove_adapter);
236 
tifm_free_adapter(struct tifm_adapter * fm)237 void tifm_free_adapter(struct tifm_adapter *fm)
238 {
239 	put_device(&fm->dev);
240 }
241 EXPORT_SYMBOL(tifm_free_adapter);
242 
tifm_free_device(struct device * dev)243 void tifm_free_device(struct device *dev)
244 {
245 	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
246 	kfree(sock);
247 }
248 EXPORT_SYMBOL(tifm_free_device);
249 
tifm_alloc_device(struct tifm_adapter * fm,unsigned int id,unsigned char type)250 struct 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 }
279 EXPORT_SYMBOL(tifm_alloc_device);
280 
tifm_eject(struct tifm_dev * sock)281 void tifm_eject(struct tifm_dev *sock)
282 {
283 	struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
284 	fm->eject(fm, sock);
285 }
286 EXPORT_SYMBOL(tifm_eject);
287 
tifm_has_ms_pif(struct tifm_dev * sock)288 int 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 }
293 EXPORT_SYMBOL(tifm_has_ms_pif);
294 
tifm_map_sg(struct tifm_dev * sock,struct scatterlist * sg,int nents,int direction)295 int 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 }
300 EXPORT_SYMBOL(tifm_map_sg);
301 
tifm_unmap_sg(struct tifm_dev * sock,struct scatterlist * sg,int nents,int direction)302 void 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 }
307 EXPORT_SYMBOL(tifm_unmap_sg);
308 
tifm_queue_work(struct work_struct * work)309 void tifm_queue_work(struct work_struct *work)
310 {
311 	queue_work(workqueue, work);
312 }
313 EXPORT_SYMBOL(tifm_queue_work);
314 
tifm_register_driver(struct tifm_driver * drv)315 int tifm_register_driver(struct tifm_driver *drv)
316 {
317 	drv->driver.bus = &tifm_bus_type;
318 
319 	return driver_register(&drv->driver);
320 }
321 EXPORT_SYMBOL(tifm_register_driver);
322 
tifm_unregister_driver(struct tifm_driver * drv)323 void tifm_unregister_driver(struct tifm_driver *drv)
324 {
325 	driver_unregister(&drv->driver);
326 }
327 EXPORT_SYMBOL(tifm_unregister_driver);
328 
tifm_init(void)329 static 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 
348 err_out_wq:
349 	destroy_workqueue(workqueue);
350 
351 	return rc;
352 }
353 
tifm_exit(void)354 static void __exit tifm_exit(void)
355 {
356 	class_unregister(&tifm_adapter_class);
357 	bus_unregister(&tifm_bus_type);
358 	destroy_workqueue(workqueue);
359 }
360 
361 subsys_initcall(tifm_init);
362 module_exit(tifm_exit);
363 
364 MODULE_LICENSE("GPL");
365 MODULE_AUTHOR("Alex Dubov");
366 MODULE_DESCRIPTION("TI FlashMedia core driver");
367 MODULE_LICENSE("GPL");
368 MODULE_VERSION(DRIVER_VERSION);
369