GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / misc / tifm_core.c
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
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
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
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
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
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
85 static void tifm_dummy_event(struct tifm_dev *sock)
86 {
87         return;
88 }
89
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
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
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
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
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
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
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
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
234 void tifm_free_adapter(struct tifm_adapter *fm)
235 {
236         put_device(&fm->dev);
237 }
238 EXPORT_SYMBOL(tifm_free_adapter);
239
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
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
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
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
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
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
307 void tifm_queue_work(struct work_struct *work)
308 {
309         queue_work(workqueue, work);
310 }
311 EXPORT_SYMBOL(tifm_queue_work);
312
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
321 void tifm_unregister_driver(struct tifm_driver *drv)
322 {
323         driver_unregister(&drv->driver);
324 }
325 EXPORT_SYMBOL(tifm_unregister_driver);
326
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
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);