tifm_sd: restructure initialization, removal and command handling
[linux-2.6.git] / drivers / misc / tifm_core.c
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/init.h>
14 #include <linux/idr.h>
15
16 #define DRIVER_NAME "tifm_core"
17 #define DRIVER_VERSION "0.6"
18
19 static DEFINE_IDR(tifm_adapter_idr);
20 static DEFINE_SPINLOCK(tifm_adapter_lock);
21
22 static tifm_media_id *tifm_device_match(tifm_media_id *ids,
23                         struct tifm_dev *dev)
24 {
25         while (*ids) {
26                 if (dev->media_id == *ids)
27                         return ids;
28                 ids++;
29         }
30         return NULL;
31 }
32
33 static int tifm_match(struct device *dev, struct device_driver *drv)
34 {
35         struct tifm_dev *fm_dev = container_of(dev, struct tifm_dev, dev);
36         struct tifm_driver *fm_drv;
37
38         fm_drv = container_of(drv, struct tifm_driver, driver);
39         if (!fm_drv->id_table)
40                 return -EINVAL;
41         if (tifm_device_match(fm_drv->id_table, fm_dev))
42                 return 1;
43         return -ENODEV;
44 }
45
46 static int tifm_uevent(struct device *dev, char **envp, int num_envp,
47                        char *buffer, int buffer_size)
48 {
49         struct tifm_dev *fm_dev;
50         int i = 0;
51         int length = 0;
52         const char *card_type_name[] = {"INV", "SM", "MS", "SD"};
53
54         if (!dev || !(fm_dev = container_of(dev, struct tifm_dev, dev)))
55                 return -ENODEV;
56         if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
57                         "TIFM_CARD_TYPE=%s", card_type_name[fm_dev->media_id]))
58                 return -ENOMEM;
59
60         return 0;
61 }
62
63 static struct bus_type tifm_bus_type = {
64         .name    = "tifm",
65         .match   = tifm_match,
66         .uevent  = tifm_uevent,
67 };
68
69 static void tifm_free(struct class_device *cdev)
70 {
71         struct tifm_adapter *fm = container_of(cdev, struct tifm_adapter, cdev);
72
73         kfree(fm->sockets);
74         if (fm->wq)
75                 destroy_workqueue(fm->wq);
76         kfree(fm);
77 }
78
79 static struct class tifm_adapter_class = {
80         .name    = "tifm_adapter",
81         .release = tifm_free
82 };
83
84 struct tifm_adapter *tifm_alloc_adapter(void)
85 {
86         struct tifm_adapter *fm;
87
88         fm = kzalloc(sizeof(struct tifm_adapter), GFP_KERNEL);
89         if (fm) {
90                 fm->cdev.class = &tifm_adapter_class;
91                 spin_lock_init(&fm->lock);
92                 class_device_initialize(&fm->cdev);
93         }
94         return fm;
95 }
96 EXPORT_SYMBOL(tifm_alloc_adapter);
97
98 void tifm_free_adapter(struct tifm_adapter *fm)
99 {
100         class_device_put(&fm->cdev);
101 }
102 EXPORT_SYMBOL(tifm_free_adapter);
103
104 int tifm_add_adapter(struct tifm_adapter *fm)
105 {
106         int rc;
107
108         if (!idr_pre_get(&tifm_adapter_idr, GFP_KERNEL))
109                 return -ENOMEM;
110
111         spin_lock(&tifm_adapter_lock);
112         rc = idr_get_new(&tifm_adapter_idr, fm, &fm->id);
113         spin_unlock(&tifm_adapter_lock);
114         if (!rc) {
115                 snprintf(fm->cdev.class_id, BUS_ID_SIZE, "tifm%u", fm->id);
116                 strncpy(fm->wq_name, fm->cdev.class_id, KOBJ_NAME_LEN);
117
118                 fm->wq = create_singlethread_workqueue(fm->wq_name);
119                 if (fm->wq)
120                         return class_device_add(&fm->cdev);
121
122                 spin_lock(&tifm_adapter_lock);
123                 idr_remove(&tifm_adapter_idr, fm->id);
124                 spin_unlock(&tifm_adapter_lock);
125                 rc = -ENOMEM;
126         }
127         return rc;
128 }
129 EXPORT_SYMBOL(tifm_add_adapter);
130
131 void tifm_remove_adapter(struct tifm_adapter *fm)
132 {
133         class_device_del(&fm->cdev);
134
135         spin_lock(&tifm_adapter_lock);
136         idr_remove(&tifm_adapter_idr, fm->id);
137         spin_unlock(&tifm_adapter_lock);
138 }
139 EXPORT_SYMBOL(tifm_remove_adapter);
140
141 void tifm_free_device(struct device *dev)
142 {
143         struct tifm_dev *fm_dev = container_of(dev, struct tifm_dev, dev);
144         kfree(fm_dev);
145 }
146 EXPORT_SYMBOL(tifm_free_device);
147
148 struct tifm_dev *tifm_alloc_device(struct tifm_adapter *fm)
149 {
150         struct tifm_dev *dev = kzalloc(sizeof(struct tifm_dev), GFP_KERNEL);
151
152         if (dev) {
153                 spin_lock_init(&dev->lock);
154
155                 dev->dev.parent = fm->dev;
156                 dev->dev.bus = &tifm_bus_type;
157                 dev->dev.release = tifm_free_device;
158         }
159         return dev;
160 }
161 EXPORT_SYMBOL(tifm_alloc_device);
162
163 void tifm_eject(struct tifm_dev *sock)
164 {
165         struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
166         fm->eject(fm, sock);
167 }
168 EXPORT_SYMBOL(tifm_eject);
169
170 int tifm_map_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
171                 int direction)
172 {
173         return pci_map_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
174 }
175 EXPORT_SYMBOL(tifm_map_sg);
176
177 void tifm_unmap_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
178                    int direction)
179 {
180         pci_unmap_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
181 }
182 EXPORT_SYMBOL(tifm_unmap_sg);
183
184 static int tifm_device_probe(struct device *dev)
185 {
186         struct tifm_driver *drv;
187         struct tifm_dev *fm_dev;
188         int rc = 0;
189         const tifm_media_id *id;
190
191         drv = container_of(dev->driver, struct tifm_driver, driver);
192         fm_dev = container_of(dev, struct tifm_dev, dev);
193         get_device(dev);
194         if (!fm_dev->drv && drv->probe && drv->id_table) {
195                 rc = -ENODEV;
196                 id = tifm_device_match(drv->id_table, fm_dev);
197                 if (id)
198                         rc = drv->probe(fm_dev);
199                 if (rc >= 0) {
200                         rc = 0;
201                         fm_dev->drv = drv;
202                 }
203         }
204         if (rc)
205                 put_device(dev);
206         return rc;
207 }
208
209 static int tifm_device_remove(struct device *dev)
210 {
211         struct tifm_dev *fm_dev = container_of(dev, struct tifm_dev, dev);
212         struct tifm_driver *drv = fm_dev->drv;
213
214         if (drv) {
215                 if (drv->remove)
216                         drv->remove(fm_dev);
217                 fm_dev->drv = NULL;
218         }
219
220         put_device(dev);
221         return 0;
222 }
223
224 int tifm_register_driver(struct tifm_driver *drv)
225 {
226         drv->driver.bus = &tifm_bus_type;
227         drv->driver.probe = tifm_device_probe;
228         drv->driver.remove = tifm_device_remove;
229
230         return driver_register(&drv->driver);
231 }
232 EXPORT_SYMBOL(tifm_register_driver);
233
234 void tifm_unregister_driver(struct tifm_driver *drv)
235 {
236         driver_unregister(&drv->driver);
237 }
238 EXPORT_SYMBOL(tifm_unregister_driver);
239
240 static int __init tifm_init(void)
241 {
242         int rc = bus_register(&tifm_bus_type);
243
244         if (!rc) {
245                 rc = class_register(&tifm_adapter_class);
246                 if (rc)
247                         bus_unregister(&tifm_bus_type);
248         }
249
250         return rc;
251 }
252
253 static void __exit tifm_exit(void)
254 {
255         class_unregister(&tifm_adapter_class);
256         bus_unregister(&tifm_bus_type);
257 }
258
259 subsys_initcall(tifm_init);
260 module_exit(tifm_exit);
261
262 MODULE_LICENSE("GPL");
263 MODULE_AUTHOR("Alex Dubov");
264 MODULE_DESCRIPTION("TI FlashMedia core driver");
265 MODULE_LICENSE("GPL");
266 MODULE_VERSION(DRIVER_VERSION);