1 /*
2 * linux/drivers/mmc/core/sdio_bus.c
3 *
4 * Copyright 2007 Pierre Ossman
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 as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
10 *
11 * SDIO function driver model
12 */
13
14 #include <linux/device.h>
15 #include <linux/err.h>
16
17 #include <linux/mmc/card.h>
18 #include <linux/mmc/sdio_func.h>
19
20 #include "sdio_cis.h"
21 #include "sdio_bus.h"
22
23 #define dev_to_sdio_func(d) container_of(d, struct sdio_func, dev)
24 #define to_sdio_driver(d) container_of(d, struct sdio_driver, drv)
25
26 /* show configuration fields */
27 #define sdio_config_attr(field, format_string) \
28 static ssize_t \
29 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
30 { \
31 struct sdio_func *func; \
32 \
33 func = dev_to_sdio_func (dev); \
34 return sprintf (buf, format_string, func->field); \
35 }
36
37 sdio_config_attr(class, "0x%02x\n");
38 sdio_config_attr(vendor, "0x%04x\n");
39 sdio_config_attr(device, "0x%04x\n");
40
41 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
42 {
43 struct sdio_func *func = dev_to_sdio_func (dev);
44
45 return sprintf(buf, "sdio:c%02Xv%04Xd%04X\n",
46 func->class, func->vendor, func->device);
47 }
48
49 static struct device_attribute sdio_dev_attrs[] = {
50 __ATTR_RO(class),
51 __ATTR_RO(vendor),
52 __ATTR_RO(device),
53 __ATTR_RO(modalias),
54 __ATTR_NULL,
55 };
56
57 static const struct sdio_device_id *sdio_match_one(struct sdio_func *func,
58 const struct sdio_device_id *id)
59 {
60 if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class)
61 return NULL;
62 if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor)
63 return NULL;
64 if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device)
65 return NULL;
66 return id;
67 }
68
69 static const struct sdio_device_id *sdio_match_device(struct sdio_func *func,
70 struct sdio_driver *sdrv)
71 {
72 const struct sdio_device_id *ids;
73
74 ids = sdrv->id_table;
75
76 if (ids) {
77 while (ids->class || ids->vendor || ids->device) {
78 if (sdio_match_one(func, ids))
79 return ids;
80 ids++;
81 }
82 }
83
84 return NULL;
85 }
86
87 static int sdio_bus_match(struct device *dev, struct device_driver *drv)
88 {
89 struct sdio_func *func = dev_to_sdio_func(dev);
90 struct sdio_driver *sdrv = to_sdio_driver(drv);
91
92 if (sdio_match_device(func, sdrv))
93 return 1;
94
95 return 0;
96 }
97
98 static int
99 sdio_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
100 {
101 struct sdio_func *func = dev_to_sdio_func(dev);
102
103 if (add_uevent_var(env,
104 "SDIO_CLASS=%02X", func->class))
105 return -ENOMEM;
106
107 if (add_uevent_var(env,
108 "SDIO_ID=%04X:%04X", func->vendor, func->device))
109 return -ENOMEM;
110
111 if (add_uevent_var(env,
112 "MODALIAS=sdio:c%02Xv%04Xd%04X",
113 func->class, func->vendor, func->device))
114 return -ENOMEM;
115
116 return 0;
117 }
118
119 static int sdio_bus_probe(struct device *dev)
120 {
121 struct sdio_driver *drv = to_sdio_driver(dev->driver);
122 struct sdio_func *func = dev_to_sdio_func(dev);
123 const struct sdio_device_id *id;
124 int ret;
125
126 id = sdio_match_device(func, drv);
127 if (!id)
128 return -ENODEV;
129
130 /* Set the default block size so the driver is sure it's something
131 * sensible. */
132 sdio_claim_host(func);
133 ret = sdio_set_block_size(func, 0);
134 sdio_release_host(func);
135 if (ret)
136 return ret;
137
138 return drv->probe(func, id);
139 }
140
141 static int sdio_bus_remove(struct device *dev)
142 {
143 struct sdio_driver *drv = to_sdio_driver(dev->driver);
144 struct sdio_func *func = dev_to_sdio_func(dev);
145
146 drv->remove(func);
147
148 if (func->irq_handler) {
149 printk(KERN_WARNING "WARNING: driver %s did not remove "
150 "its interrupt handler!\n", drv->name);
151 sdio_claim_host(func);
152 sdio_release_irq(func);
153 sdio_release_host(func);
154 }
155
156 return 0;
157 }
158
159 static struct bus_type sdio_bus_type = {
160 .name = "sdio",
161 .dev_attrs = sdio_dev_attrs,
162 .match = sdio_bus_match,
163 .uevent = sdio_bus_uevent,
164 .probe = sdio_bus_probe,
165 .remove = sdio_bus_remove,
166 };
167
168 int sdio_register_bus(void)
169 {
170 return bus_register(&sdio_bus_type);
171 }
172
173 void sdio_unregister_bus(void)
174 {
175 bus_unregister(&sdio_bus_type);
176 }
177
178 /**
179 * sdio_register_driver - register a function driver
180 * @drv: SDIO function driver
181 */
182 int sdio_register_driver(struct sdio_driver *drv)
183 {
184 drv->drv.name = drv->name;
185 drv->drv.bus = &sdio_bus_type;
186 return driver_register(&drv->drv);
187 }
188 EXPORT_SYMBOL_GPL(sdio_register_driver);
189
190 /**
191 * sdio_unregister_driver - unregister a function driver
192 * @drv: SDIO function driver
193 */
194 void sdio_unregister_driver(struct sdio_driver *drv)
195 {
196 drv->drv.bus = &sdio_bus_type;
197 driver_unregister(&drv->drv);
198 }
199 EXPORT_SYMBOL_GPL(sdio_unregister_driver);
200
201 static void sdio_release_func(struct device *dev)
202 {
203 struct sdio_func *func = dev_to_sdio_func(dev);
204
205 sdio_free_func_cis(func);
206
207 if (func->info)
208 kfree(func->info);
209
210 kfree(func);
211 }
212
213 /*
214 * Allocate and initialise a new SDIO function structure.
215 */
216 struct sdio_func *sdio_alloc_func(struct mmc_card *card)
217 {
218 struct sdio_func *func;
219
220 func = kzalloc(sizeof(struct sdio_func), GFP_KERNEL);
221 if (!func)
222 return ERR_PTR(-ENOMEM);
223
224 func->card = card;
225
226 device_initialize(&func->dev);
227
228 func->dev.parent = &card->dev;
229 func->dev.bus = &sdio_bus_type;
230 func->dev.release = sdio_release_func;
231
232 return func;
233 }
234
235 /*
236 * Register a new SDIO function with the driver model.
237 */
238 int sdio_add_func(struct sdio_func *func)
239 {
240 int ret;
241
242 snprintf(func->dev.bus_id, sizeof(func->dev.bus_id),
243 "%s:%d", mmc_card_id(func->card), func->num);
244
245 ret = device_add(&func->dev);
246 if (ret == 0)
247 sdio_func_set_present(func);
248
249 return ret;
250 }
251
252 /*
253 * Unregister a SDIO function with the driver model, and
254 * (eventually) free it.
255 */
256 void sdio_remove_func(struct sdio_func *func)
257 {
258 if (sdio_func_present(func))
259 device_del(&func->dev);
260
261 put_device(&func->dev);
262 }
263
264
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