3eaf2c985b7d8d588cb5c78de7e2f8ea592f5914
[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 static void tifm_dummy_signal_irq(struct tifm_dev *sock,
149                                   unsigned int sock_irq_status)
150 {
151         return;
152 }
153
154 struct tifm_dev *tifm_alloc_device(struct tifm_adapter *fm)
155 {
156         struct tifm_dev *dev = kzalloc(sizeof(struct tifm_dev), GFP_KERNEL);
157
158         if (dev) {
159                 spin_lock_init(&dev->lock);
160
161                 dev->dev.parent = fm->dev;
162                 dev->dev.bus = &tifm_bus_type;
163                 dev->dev.release = tifm_free_device;
164                 dev->signal_irq = tifm_dummy_signal_irq;
165         }
166         return dev;
167 }
168 EXPORT_SYMBOL(tifm_alloc_device);
169
170 void tifm_eject(struct tifm_dev *sock)
171 {
172         struct tifm_adapter *fm = dev_get_drvdata(sock->dev.parent);
173         fm->eject(fm, sock);
174 }
175 EXPORT_SYMBOL(tifm_eject);
176
177 int tifm_map_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
178                 int direction)
179 {
180         return pci_map_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
181 }
182 EXPORT_SYMBOL(tifm_map_sg);
183
184 void tifm_unmap_sg(struct tifm_dev *sock, struct scatterlist *sg, int nents,
185                    int direction)
186 {
187         pci_unmap_sg(to_pci_dev(sock->dev.parent), sg, nents, direction);
188 }
189 EXPORT_SYMBOL(tifm_unmap_sg);
190
191 static int tifm_device_probe(struct device *dev)
192 {
193         struct tifm_driver *drv;
194         struct tifm_dev *fm_dev;
195         int rc = 0;
196         const tifm_media_id *id;
197
198         drv = container_of(dev->driver, struct tifm_driver, driver);
199         fm_dev = container_of(dev, struct tifm_dev, dev);
200         get_device(dev);
201         if (!fm_dev->drv && drv->probe && drv->id_table) {
202                 rc = -ENODEV;
203                 id = tifm_device_match(drv->id_table, fm_dev);
204                 if (id)
205                         rc = drv->probe(fm_dev);
206                 if (rc >= 0) {
207                         rc = 0;
208                         fm_dev->drv = drv;
209                 }
210         }
211         if (rc)
212                 put_device(dev);
213         return rc;
214 }
215
216 static int tifm_device_remove(struct device *dev)
217 {
218         struct tifm_dev *fm_dev = container_of(dev, struct tifm_dev, dev);
219         struct tifm_driver *drv = fm_dev->drv;
220
221         if (drv) {
222                 fm_dev->signal_irq = tifm_dummy_signal_irq;
223                 if (drv->remove)
224                         drv->remove(fm_dev);
225                 fm_dev->drv = NULL;
226         }
227
228         put_device(dev);
229         return 0;
230 }
231
232 int tifm_register_driver(struct tifm_driver *drv)
233 {
234         drv->driver.bus = &tifm_bus_type;
235         drv->driver.probe = tifm_device_probe;
236         drv->driver.remove = tifm_device_remove;
237
238         return driver_register(&drv->driver);
239 }
240 EXPORT_SYMBOL(tifm_register_driver);
241
242 void tifm_unregister_driver(struct tifm_driver *drv)
243 {
244         driver_unregister(&drv->driver);
245 }
246 EXPORT_SYMBOL(tifm_unregister_driver);
247
248 static int __init tifm_init(void)
249 {
250         int rc = bus_register(&tifm_bus_type);
251
252         if (!rc) {
253                 rc = class_register(&tifm_adapter_class);
254                 if (rc)
255                         bus_unregister(&tifm_bus_type);
256         }
257
258         return rc;
259 }
260
261 static void __exit tifm_exit(void)
262 {
263         class_unregister(&tifm_adapter_class);
264         bus_unregister(&tifm_bus_type);
265 }
266
267 subsys_initcall(tifm_init);
268 module_exit(tifm_exit);
269
270 MODULE_LICENSE("GPL");
271 MODULE_AUTHOR("Alex Dubov");
272 MODULE_DESCRIPTION("TI FlashMedia core driver");
273 MODULE_LICENSE("GPL");
274 MODULE_VERSION(DRIVER_VERSION);