2 * linux/drivers/mmc/core/sdio_bus.c
4 * Copyright 2007 Pierre Ossman
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.
11 * SDIO function driver model
14 #include <linux/device.h>
15 #include <linux/err.h>
16 #include <linux/export.h>
17 #include <linux/slab.h>
18 #include <linux/pm_runtime.h>
19 #include <linux/pm_domain.h>
20 #include <linux/acpi.h>
22 #include <linux/mmc/card.h>
23 #include <linux/mmc/host.h>
24 #include <linux/mmc/sdio_func.h>
31 #define to_sdio_driver(d) container_of(d, struct sdio_driver, drv)
33 /* show configuration fields */
34 #define sdio_config_attr(field, format_string) \
36 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
38 struct sdio_func *func; \
40 func = dev_to_sdio_func (dev); \
41 return sprintf (buf, format_string, func->field); \
43 static DEVICE_ATTR_RO(field)
45 sdio_config_attr(class, "0x%02x\n");
46 sdio_config_attr(vendor, "0x%04x\n");
47 sdio_config_attr(device, "0x%04x\n");
49 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
51 struct sdio_func *func = dev_to_sdio_func (dev);
53 return sprintf(buf, "sdio:c%02Xv%04Xd%04X\n",
54 func->class, func->vendor, func->device);
56 static DEVICE_ATTR_RO(modalias);
58 static struct attribute *sdio_dev_attrs[] = {
60 &dev_attr_vendor.attr,
61 &dev_attr_device.attr,
62 &dev_attr_modalias.attr,
65 ATTRIBUTE_GROUPS(sdio_dev);
67 static const struct sdio_device_id *sdio_match_one(struct sdio_func *func,
68 const struct sdio_device_id *id)
70 if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class)
72 if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor)
74 if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device)
79 static const struct sdio_device_id *sdio_match_device(struct sdio_func *func,
80 struct sdio_driver *sdrv)
82 const struct sdio_device_id *ids;
87 while (ids->class || ids->vendor || ids->device) {
88 if (sdio_match_one(func, ids))
97 static int sdio_bus_match(struct device *dev, struct device_driver *drv)
99 struct sdio_func *func = dev_to_sdio_func(dev);
100 struct sdio_driver *sdrv = to_sdio_driver(drv);
102 if (sdio_match_device(func, sdrv))
109 sdio_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
111 struct sdio_func *func = dev_to_sdio_func(dev);
113 if (add_uevent_var(env,
114 "SDIO_CLASS=%02X", func->class))
117 if (add_uevent_var(env,
118 "SDIO_ID=%04X:%04X", func->vendor, func->device))
121 if (add_uevent_var(env,
122 "MODALIAS=sdio:c%02Xv%04Xd%04X",
123 func->class, func->vendor, func->device))
129 static int sdio_bus_probe(struct device *dev)
131 struct sdio_driver *drv = to_sdio_driver(dev->driver);
132 struct sdio_func *func = dev_to_sdio_func(dev);
133 const struct sdio_device_id *id;
136 id = sdio_match_device(func, drv);
140 /* Unbound SDIO functions are always suspended.
141 * During probe, the function is set active and the usage count
142 * is incremented. If the driver supports runtime PM,
143 * it should call pm_runtime_put_noidle() in its probe routine and
144 * pm_runtime_get_noresume() in its remove routine.
146 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD) {
147 ret = pm_runtime_get_sync(dev);
149 goto disable_runtimepm;
152 /* Set the default block size so the driver is sure it's something
154 sdio_claim_host(func);
155 ret = sdio_set_block_size(func, 0);
156 sdio_release_host(func);
158 goto disable_runtimepm;
160 ret = drv->probe(func, id);
162 goto disable_runtimepm;
167 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
168 pm_runtime_put_noidle(dev);
172 static int sdio_bus_remove(struct device *dev)
174 struct sdio_driver *drv = to_sdio_driver(dev->driver);
175 struct sdio_func *func = dev_to_sdio_func(dev);
178 /* Make sure card is powered before invoking ->remove() */
179 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
180 pm_runtime_get_sync(dev);
184 if (func->irq_handler) {
185 pr_warn("WARNING: driver %s did not remove its interrupt handler!\n",
187 sdio_claim_host(func);
188 sdio_release_irq(func);
189 sdio_release_host(func);
192 /* First, undo the increment made directly above */
193 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
194 pm_runtime_put_noidle(dev);
196 /* Then undo the runtime PM settings in sdio_bus_probe() */
197 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
198 pm_runtime_put_sync(dev);
203 static const struct dev_pm_ops sdio_bus_pm_ops = {
204 SET_SYSTEM_SLEEP_PM_OPS(pm_generic_suspend, pm_generic_resume)
206 pm_generic_runtime_suspend,
207 pm_generic_runtime_resume,
212 static struct bus_type sdio_bus_type = {
214 .dev_groups = sdio_dev_groups,
215 .match = sdio_bus_match,
216 .uevent = sdio_bus_uevent,
217 .probe = sdio_bus_probe,
218 .remove = sdio_bus_remove,
219 .pm = &sdio_bus_pm_ops,
222 int sdio_register_bus(void)
224 return bus_register(&sdio_bus_type);
227 void sdio_unregister_bus(void)
229 bus_unregister(&sdio_bus_type);
233 * sdio_register_driver - register a function driver
234 * @drv: SDIO function driver
236 int sdio_register_driver(struct sdio_driver *drv)
238 drv->drv.name = drv->name;
239 drv->drv.bus = &sdio_bus_type;
240 return driver_register(&drv->drv);
242 EXPORT_SYMBOL_GPL(sdio_register_driver);
245 * sdio_unregister_driver - unregister a function driver
246 * @drv: SDIO function driver
248 void sdio_unregister_driver(struct sdio_driver *drv)
250 drv->drv.bus = &sdio_bus_type;
251 driver_unregister(&drv->drv);
253 EXPORT_SYMBOL_GPL(sdio_unregister_driver);
255 static void sdio_release_func(struct device *dev)
257 struct sdio_func *func = dev_to_sdio_func(dev);
259 sdio_free_func_cis(func);
267 * Allocate and initialise a new SDIO function structure.
269 struct sdio_func *sdio_alloc_func(struct mmc_card *card)
271 struct sdio_func *func;
273 func = kzalloc(sizeof(struct sdio_func), GFP_KERNEL);
275 return ERR_PTR(-ENOMEM);
279 device_initialize(&func->dev);
281 func->dev.parent = &card->dev;
282 func->dev.bus = &sdio_bus_type;
283 func->dev.release = sdio_release_func;
289 static void sdio_acpi_set_handle(struct sdio_func *func)
291 struct mmc_host *host = func->card->host;
292 u64 addr = ((u64)host->slotno << 16) | func->num;
294 acpi_preset_companion(&func->dev, ACPI_COMPANION(host->parent), addr);
297 static inline void sdio_acpi_set_handle(struct sdio_func *func) {}
300 static void sdio_set_of_node(struct sdio_func *func)
302 struct mmc_host *host = func->card->host;
304 func->dev.of_node = mmc_of_find_child_device(host, func->num);
308 * Register a new SDIO function with the driver model.
310 int sdio_add_func(struct sdio_func *func)
314 dev_set_name(&func->dev, "%s:%d", mmc_card_id(func->card), func->num);
316 sdio_set_of_node(func);
317 sdio_acpi_set_handle(func);
318 ret = device_add(&func->dev);
320 sdio_func_set_present(func);
321 dev_pm_domain_attach(&func->dev, false);
328 * Unregister a SDIO function with the driver model, and
329 * (eventually) free it.
330 * This function can be called through error paths where sdio_add_func() was
331 * never executed (because a failure occurred at an earlier point).
333 void sdio_remove_func(struct sdio_func *func)
335 if (!sdio_func_present(func))
338 dev_pm_domain_detach(&func->dev, false);
339 device_del(&func->dev);
340 of_node_put(func->dev.of_node);
341 put_device(&func->dev);