tifm_7xx1: switch from workqueue to kthread
[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         kfree(fm);
75 }
76
77 static struct class tifm_adapter_class = {
78         .name    = "tifm_adapter",
79         .release = tifm_free
80 };
81
82 struct tifm_adapter *tifm_alloc_adapter(void)
83 {
84         struct tifm_adapter *fm;
85
86         fm = kzalloc(sizeof(struct tifm_adapter), GFP_KERNEL);
87         if (fm) {
88                 fm->cdev.class = &tifm_adapter_class;
89                 spin_lock_init(&fm->lock);
90                 class_device_initialize(&fm->cdev);
91         }
92         return fm;
93 }
94 EXPORT_SYMBOL(tifm_alloc_adapter);
95
96 void tifm_free_adapter(struct tifm_adapter *fm)
97 {
98         class_device_put(&fm->cdev);
99 }
100 EXPORT_SYMBOL(tifm_free_adapter);
101
102 int tifm_add_adapter(struct tifm_adapter *fm,
103                      int (*mediathreadfn)(void *data))
104 {
105         int rc;
106
107         if (!idr_pre_get(&tifm_adapter_idr, GFP_KERNEL))
108                 return -ENOMEM;
109
110         spin_lock(&tifm_adapter_lock);
111         rc = idr_get_new(&tifm_adapter_idr, fm, &fm->id);
112         spin_unlock(&tifm_adapter_lock);
113         if (!rc) {
114                 snprintf(fm->cdev.class_id, BUS_ID_SIZE, "tifm%u", fm->id);
115                 fm->media_switcher = kthread_create(mediathreadfn,
116                                                     fm, "tifm/%u", fm->id);
117
118                 if (!IS_ERR(fm->media_switcher))
119                         return class_device_add(&fm->cdev);
120
121                 spin_lock(&tifm_adapter_lock);
122                 idr_remove(&tifm_adapter_idr, fm->id);
123                 spin_unlock(&tifm_adapter_lock);
124                 rc = -ENOMEM;
125         }
126         return rc;
127 }
128 EXPORT_SYMBOL(tifm_add_adapter);
129
130 void tifm_remove_adapter(struct tifm_adapter *fm)
131 {
132         class_device_del(&fm->cdev);
133
134         spin_lock(&tifm_adapter_lock);
135         idr_remove(&tifm_adapter_idr, fm->id);
136         spin_unlock(&tifm_adapter_lock);
137 }
138 EXPORT_SYMBOL(tifm_remove_adapter);
139
140 void tifm_free_device(struct device *dev)
141 {
142         struct tifm_dev *fm_dev = container_of(dev, struct tifm_dev, dev);
143         kfree(fm_dev);
144 }
145 EXPORT_SYMBOL(tifm_free_device);
146
147 static void tifm_dummy_signal_irq(struct tifm_dev *sock,
148                                   unsigned int sock_irq_status)
149 {
150         return;
151 }
152
153 struct tifm_dev *tifm_alloc_device(struct tifm_adapter *fm)
154 {
155         struct tifm_dev *dev = kzalloc(sizeof(struct tifm_dev), GFP_KERNEL);
156
157         if (dev) {
158                 spin_lock_init(&dev->lock);
159
160                 dev->dev.parent = fm->dev;
161                 dev->dev.bus = &tifm_bus_type;
162                 dev->dev.release = tifm_free_device;
163                 dev->signal_irq = tifm_dummy_signal_irq;
164         }
165         return dev;
166 }
167 EXPORT_SYMBOL(tifm_alloc_device);
168
169 void tifm_eject(struct tifm_dev *sock)
170 {
171         struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
172         fm->eject(fm, sock);
173 }
174 EXPORT_SYMBOL(tifm_eject);
175
176 int tifm_map_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
177                 int direction)
178 {
179         return pci_map_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
180 }
181 EXPORT_SYMBOL(tifm_map_sg);
182
183 void tifm_unmap_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
184                    int direction)
185 {
186         pci_unmap_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
187 }
188 EXPORT_SYMBOL(tifm_unmap_sg);
189
190 static int tifm_device_probe(struct device *dev)
191 {
192         struct tifm_driver *drv;
193         struct tifm_dev *fm_dev;
194         int rc = 0;
195         const tifm_media_id *id;
196
197         drv = container_of(dev->driver, struct tifm_driver, driver);
198         fm_dev = container_of(dev, struct tifm_dev, dev);
199         get_device(dev);
200         if (!fm_dev->drv && drv->probe && drv->id_table) {
201                 rc = -ENODEV;
202                 id = tifm_device_match(drv->id_table, fm_dev);
203                 if (id)
204                         rc = drv->probe(fm_dev);
205                 if (rc >= 0) {
206                         rc = 0;
207                         fm_dev->drv = drv;
208                 }
209         }
210         if (rc)
211                 put_device(dev);
212         return rc;
213 }
214
215 static int tifm_device_remove(struct device *dev)
216 {
217         struct tifm_dev *fm_dev = container_of(dev, struct tifm_dev, dev);
218         struct tifm_driver *drv = fm_dev->drv;
219
220         if (drv) {
221                 fm_dev->signal_irq = tifm_dummy_signal_irq;
222                 if (drv->remove)
223                         drv->remove(fm_dev);
224                 fm_dev->drv = NULL;
225         }
226
227         put_device(dev);
228         return 0;
229 }
230
231 int tifm_register_driver(struct tifm_driver *drv)
232 {
233         drv->driver.bus = &tifm_bus_type;
234         drv->driver.probe = tifm_device_probe;
235         drv->driver.remove = tifm_device_remove;
236
237         return driver_register(&drv->driver);
238 }
239 EXPORT_SYMBOL(tifm_register_driver);
240
241 void tifm_unregister_driver(struct tifm_driver *drv)
242 {
243         driver_unregister(&drv->driver);
244 }
245 EXPORT_SYMBOL(tifm_unregister_driver);
246
247 static int __init tifm_init(void)
248 {
249         int rc = bus_register(&tifm_bus_type);
250
251         if (!rc) {
252                 rc = class_register(&tifm_adapter_class);
253                 if (rc)
254                         bus_unregister(&tifm_bus_type);
255         }
256
257         return rc;
258 }
259
260 static void __exit tifm_exit(void)
261 {
262         class_unregister(&tifm_adapter_class);
263         bus_unregister(&tifm_bus_type);
264 }
265
266 subsys_initcall(tifm_init);
267 module_exit(tifm_exit);
268
269 MODULE_LICENSE("GPL");
270 MODULE_AUTHOR("Alex Dubov");
271 MODULE_DESCRIPTION("TI FlashMedia core driver");
272 MODULE_LICENSE("GPL");
273 MODULE_VERSION(DRIVER_VERSION);