1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * tifm_core.c - TI FlashMedia driver
4 *
5 * Copyright (C) 2006 Alex Dubov <oakad@yahoo.com>
6 */
7
8 #include <linux/tifm.h>
9 #include <linux/slab.h>
10 #include <linux/init.h>
11 #include <linux/idr.h>
12 #include <linux/module.h>
13
14 #define DRIVER_NAME "tifm_core"
15 #define DRIVER_VERSION "0.8"
16
17 static struct workqueue_struct *workqueue;
18 static DEFINE_IDR(tifm_adapter_idr);
19 static DEFINE_SPINLOCK(tifm_adapter_lock);
20
tifm_media_type_name(unsigned char type,unsigned char nt)21 static const char *tifm_media_type_name(unsigned char type, unsigned char nt)
22 {
23 const char *card_type_name[3][3] = {
24 { "SmartMedia/xD", "MemoryStick", "MMC/SD" },
25 { "XD", "MS", "SD"},
26 { "xd", "ms", "sd"}
27 };
28
29 if (nt > 2 || type < 1 || type > 3)
30 return NULL;
31 return card_type_name[nt][type - 1];
32 }
33
tifm_dev_match(struct tifm_dev * sock,struct tifm_device_id * id)34 static int tifm_dev_match(struct tifm_dev *sock, struct tifm_device_id *id)
35 {
36 if (sock->type == id->type)
37 return 1;
38 return 0;
39 }
40
tifm_bus_match(struct device * dev,struct device_driver * drv)41 static int tifm_bus_match(struct device *dev, struct device_driver *drv)
42 {
43 struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
44 struct tifm_driver *fm_drv = container_of(drv, struct tifm_driver,
45 driver);
46 struct tifm_device_id *ids = fm_drv->id_table;
47
48 if (ids) {
49 while (ids->type) {
50 if (tifm_dev_match(sock, ids))
51 return 1;
52 ++ids;
53 }
54 }
55 return 0;
56 }
57
tifm_uevent(struct device * dev,struct kobj_uevent_env * env)58 static int tifm_uevent(struct device *dev, struct kobj_uevent_env *env)
59 {
60 struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
61
62 if (add_uevent_var(env, "TIFM_CARD_TYPE=%s", tifm_media_type_name(sock->type, 1)))
63 return -ENOMEM;
64
65 return 0;
66 }
67
tifm_device_probe(struct device * dev)68 static int tifm_device_probe(struct device *dev)
69 {
70 struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
71 struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
72 driver);
73 int rc = -ENODEV;
74
75 get_device(dev);
76 if (dev->driver && drv->probe) {
77 rc = drv->probe(sock);
78 if (!rc)
79 return 0;
80 }
81 put_device(dev);
82 return rc;
83 }
84
tifm_dummy_event(struct tifm_dev * sock)85 static void tifm_dummy_event(struct tifm_dev *sock)
86 {
87 return;
88 }
89
tifm_device_remove(struct device * dev)90 static void tifm_device_remove(struct device *dev)
91 {
92 struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
93 struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
94 driver);
95
96 if (dev->driver && drv->remove) {
97 sock->card_event = tifm_dummy_event;
98 sock->data_event = tifm_dummy_event;
99 drv->remove(sock);
100 sock->dev.driver = NULL;
101 }
102
103 put_device(dev);
104 }
105
106 #ifdef CONFIG_PM
107
tifm_device_suspend(struct device * dev,pm_message_t state)108 static int tifm_device_suspend(struct device *dev, pm_message_t state)
109 {
110 struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
111 struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
112 driver);
113
114 if (dev->driver && drv->suspend)
115 return drv->suspend(sock, state);
116 return 0;
117 }
118
tifm_device_resume(struct device * dev)119 static int tifm_device_resume(struct device *dev)
120 {
121 struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
122 struct tifm_driver *drv = container_of(dev->driver, struct tifm_driver,
123 driver);
124
125 if (dev->driver && drv->resume)
126 return drv->resume(sock);
127 return 0;
128 }
129
130 #else
131
132 #define tifm_device_suspend NULL
133 #define tifm_device_resume NULL
134
135 #endif /* CONFIG_PM */
136
type_show(struct device * dev,struct device_attribute * attr,char * buf)137 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
138 char *buf)
139 {
140 struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
141 return sprintf(buf, "%x", sock->type);
142 }
143 static DEVICE_ATTR_RO(type);
144
145 static struct attribute *tifm_dev_attrs[] = {
146 &dev_attr_type.attr,
147 NULL,
148 };
149 ATTRIBUTE_GROUPS(tifm_dev);
150
151 static struct bus_type tifm_bus_type = {
152 .name = "tifm",
153 .dev_groups = tifm_dev_groups,
154 .match = tifm_bus_match,
155 .uevent = tifm_uevent,
156 .probe = tifm_device_probe,
157 .remove = tifm_device_remove,
158 .suspend = tifm_device_suspend,
159 .resume = tifm_device_resume
160 };
161
tifm_free(struct device * dev)162 static void tifm_free(struct device *dev)
163 {
164 struct tifm_adapter *fm = container_of(dev, struct tifm_adapter, dev);
165
166 kfree(fm);
167 }
168
169 static struct class tifm_adapter_class = {
170 .name = "tifm_adapter",
171 .dev_release = tifm_free
172 };
173
tifm_alloc_adapter(unsigned int num_sockets,struct device * dev)174 struct tifm_adapter *tifm_alloc_adapter(unsigned int num_sockets,
175 struct device *dev)
176 {
177 struct tifm_adapter *fm;
178
179 fm = kzalloc(struct_size(fm, sockets, num_sockets), GFP_KERNEL);
180 if (fm) {
181 fm->dev.class = &tifm_adapter_class;
182 fm->dev.parent = dev;
183 device_initialize(&fm->dev);
184 spin_lock_init(&fm->lock);
185 fm->num_sockets = num_sockets;
186 }
187 return fm;
188 }
189 EXPORT_SYMBOL(tifm_alloc_adapter);
190
tifm_add_adapter(struct tifm_adapter * fm)191 int tifm_add_adapter(struct tifm_adapter *fm)
192 {
193 int rc;
194
195 idr_preload(GFP_KERNEL);
196 spin_lock(&tifm_adapter_lock);
197 rc = idr_alloc(&tifm_adapter_idr, fm, 0, 0, GFP_NOWAIT);
198 if (rc >= 0)
199 fm->id = rc;
200 spin_unlock(&tifm_adapter_lock);
201 idr_preload_end();
202 if (rc < 0)
203 return rc;
204
205 dev_set_name(&fm->dev, "tifm%u", fm->id);
206 rc = device_add(&fm->dev);
207 if (rc) {
208 spin_lock(&tifm_adapter_lock);
209 idr_remove(&tifm_adapter_idr, fm->id);
210 spin_unlock(&tifm_adapter_lock);
211 }
212
213 return rc;
214 }
215 EXPORT_SYMBOL(tifm_add_adapter);
216
tifm_remove_adapter(struct tifm_adapter * fm)217 void tifm_remove_adapter(struct tifm_adapter *fm)
218 {
219 unsigned int cnt;
220
221 flush_workqueue(workqueue);
222 for (cnt = 0; cnt < fm->num_sockets; ++cnt) {
223 if (fm->sockets[cnt])
224 device_unregister(&fm->sockets[cnt]->dev);
225 }
226
227 spin_lock(&tifm_adapter_lock);
228 idr_remove(&tifm_adapter_idr, fm->id);
229 spin_unlock(&tifm_adapter_lock);
230 device_del(&fm->dev);
231 }
232 EXPORT_SYMBOL(tifm_remove_adapter);
233
tifm_free_adapter(struct tifm_adapter * fm)234 void tifm_free_adapter(struct tifm_adapter *fm)
235 {
236 put_device(&fm->dev);
237 }
238 EXPORT_SYMBOL(tifm_free_adapter);
239
tifm_free_device(struct device * dev)240 void tifm_free_device(struct device *dev)
241 {
242 struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
243 kfree(sock);
244 }
245 EXPORT_SYMBOL(tifm_free_device);
246
tifm_alloc_device(struct tifm_adapter * fm,unsigned int id,unsigned char type)247 struct tifm_dev *tifm_alloc_device(struct tifm_adapter *fm, unsigned int id,
248 unsigned char type)
249 {
250 struct tifm_dev *sock = NULL;
251
252 if (!tifm_media_type_name(type, 0))
253 return sock;
254
255 sock = kzalloc(sizeof(struct tifm_dev), GFP_KERNEL);
256 if (sock) {
257 spin_lock_init(&sock->lock);
258 sock->type = type;
259 sock->socket_id = id;
260 sock->card_event = tifm_dummy_event;
261 sock->data_event = tifm_dummy_event;
262
263 sock->dev.parent = fm->dev.parent;
264 sock->dev.bus = &tifm_bus_type;
265 sock->dev.dma_mask = fm->dev.parent->dma_mask;
266 sock->dev.release = tifm_free_device;
267
268 dev_set_name(&sock->dev, "tifm_%s%u:%u",
269 tifm_media_type_name(type, 2), fm->id, id);
270 printk(KERN_INFO DRIVER_NAME
271 ": %s card detected in socket %u:%u\n",
272 tifm_media_type_name(type, 0), fm->id, id);
273 }
274 return sock;
275 }
276 EXPORT_SYMBOL(tifm_alloc_device);
277
tifm_eject(struct tifm_dev * sock)278 void tifm_eject(struct tifm_dev *sock)
279 {
280 struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
281 fm->eject(fm, sock);
282 }
283 EXPORT_SYMBOL(tifm_eject);
284
tifm_has_ms_pif(struct tifm_dev * sock)285 int tifm_has_ms_pif(struct tifm_dev *sock)
286 {
287 struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
288 return fm->has_ms_pif(fm, sock);
289 }
290 EXPORT_SYMBOL(tifm_has_ms_pif);
291
tifm_map_sg(struct tifm_dev * sock,struct scatterlist * sg,int nents,int direction)292 int tifm_map_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
293 int direction)
294 {
295 return dma_map_sg(&to_pci_dev(sock->dev.parent)->dev, sg, nents,
296 direction);
297 }
298 EXPORT_SYMBOL(tifm_map_sg);
299
tifm_unmap_sg(struct tifm_dev * sock,struct scatterlist * sg,int nents,int direction)300 void tifm_unmap_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
301 int direction)
302 {
303 dma_unmap_sg(&to_pci_dev(sock->dev.parent)->dev, sg, nents, direction);
304 }
305 EXPORT_SYMBOL(tifm_unmap_sg);
306
tifm_queue_work(struct work_struct * work)307 void tifm_queue_work(struct work_struct *work)
308 {
309 queue_work(workqueue, work);
310 }
311 EXPORT_SYMBOL(tifm_queue_work);
312
tifm_register_driver(struct tifm_driver * drv)313 int tifm_register_driver(struct tifm_driver *drv)
314 {
315 drv->driver.bus = &tifm_bus_type;
316
317 return driver_register(&drv->driver);
318 }
319 EXPORT_SYMBOL(tifm_register_driver);
320
tifm_unregister_driver(struct tifm_driver * drv)321 void tifm_unregister_driver(struct tifm_driver *drv)
322 {
323 driver_unregister(&drv->driver);
324 }
325 EXPORT_SYMBOL(tifm_unregister_driver);
326
tifm_init(void)327 static int __init tifm_init(void)
328 {
329 int rc;
330
331 workqueue = create_freezable_workqueue("tifm");
332 if (!workqueue)
333 return -ENOMEM;
334
335 rc = bus_register(&tifm_bus_type);
336
337 if (rc)
338 goto err_out_wq;
339
340 rc = class_register(&tifm_adapter_class);
341 if (!rc)
342 return 0;
343
344 bus_unregister(&tifm_bus_type);
345
346 err_out_wq:
347 destroy_workqueue(workqueue);
348
349 return rc;
350 }
351
tifm_exit(void)352 static void __exit tifm_exit(void)
353 {
354 class_unregister(&tifm_adapter_class);
355 bus_unregister(&tifm_bus_type);
356 destroy_workqueue(workqueue);
357 }
358
359 subsys_initcall(tifm_init);
360 module_exit(tifm_exit);
361
362 MODULE_LICENSE("GPL");
363 MODULE_AUTHOR("Alex Dubov");
364 MODULE_DESCRIPTION("TI FlashMedia core driver");
365 MODULE_LICENSE("GPL");
366 MODULE_VERSION(DRIVER_VERSION);
367