xref: /openbmc/linux/drivers/mmc/core/sdio_bus.c (revision ae0be8de) 
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 #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>
21 
22 #include <linux/mmc/card.h>
23 #include <linux/mmc/host.h>
24 #include <linux/mmc/sdio_func.h>
25 #include <linux/of.h>
26 
27 #include "core.h"
28 #include "card.h"
29 #include "sdio_cis.h"
30 #include "sdio_bus.h"
31 
32 #define to_sdio_driver(d)	container_of(d, struct sdio_driver, drv)
33 
34 /* show configuration fields */
35 #define sdio_config_attr(field, format_string)				\
36 static ssize_t								\
37 field##_show(struct device *dev, struct device_attribute *attr, char *buf)				\
38 {									\
39 	struct sdio_func *func;						\
40 									\
41 	func = dev_to_sdio_func (dev);					\
42 	return sprintf (buf, format_string, func->field);		\
43 }									\
44 static DEVICE_ATTR_RO(field)
45 
46 sdio_config_attr(class, "0x%02x\n");
47 sdio_config_attr(vendor, "0x%04x\n");
48 sdio_config_attr(device, "0x%04x\n");
49 
50 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
51 {
52 	struct sdio_func *func = dev_to_sdio_func (dev);
53 
54 	return sprintf(buf, "sdio:c%02Xv%04Xd%04X\n",
55 			func->class, func->vendor, func->device);
56 }
57 static DEVICE_ATTR_RO(modalias);
58 
59 static struct attribute *sdio_dev_attrs[] = {
60 	&dev_attr_class.attr,
61 	&dev_attr_vendor.attr,
62 	&dev_attr_device.attr,
63 	&dev_attr_modalias.attr,
64 	NULL,
65 };
66 ATTRIBUTE_GROUPS(sdio_dev);
67 
68 static const struct sdio_device_id *sdio_match_one(struct sdio_func *func,
69 	const struct sdio_device_id *id)
70 {
71 	if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class)
72 		return NULL;
73 	if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor)
74 		return NULL;
75 	if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device)
76 		return NULL;
77 	return id;
78 }
79 
80 static const struct sdio_device_id *sdio_match_device(struct sdio_func *func,
81 	struct sdio_driver *sdrv)
82 {
83 	const struct sdio_device_id *ids;
84 
85 	ids = sdrv->id_table;
86 
87 	if (ids) {
88 		while (ids->class || ids->vendor || ids->device) {
89 			if (sdio_match_one(func, ids))
90 				return ids;
91 			ids++;
92 		}
93 	}
94 
95 	return NULL;
96 }
97 
98 static int sdio_bus_match(struct device *dev, struct device_driver *drv)
99 {
100 	struct sdio_func *func = dev_to_sdio_func(dev);
101 	struct sdio_driver *sdrv = to_sdio_driver(drv);
102 
103 	if (sdio_match_device(func, sdrv))
104 		return 1;
105 
106 	return 0;
107 }
108 
109 static int
110 sdio_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
111 {
112 	struct sdio_func *func = dev_to_sdio_func(dev);
113 
114 	if (add_uevent_var(env,
115 			"SDIO_CLASS=%02X", func->class))
116 		return -ENOMEM;
117 
118 	if (add_uevent_var(env,
119 			"SDIO_ID=%04X:%04X", func->vendor, func->device))
120 		return -ENOMEM;
121 
122 	if (add_uevent_var(env,
123 			"MODALIAS=sdio:c%02Xv%04Xd%04X",
124 			func->class, func->vendor, func->device))
125 		return -ENOMEM;
126 
127 	return 0;
128 }
129 
130 static int sdio_bus_probe(struct device *dev)
131 {
132 	struct sdio_driver *drv = to_sdio_driver(dev->driver);
133 	struct sdio_func *func = dev_to_sdio_func(dev);
134 	const struct sdio_device_id *id;
135 	int ret;
136 
137 	id = sdio_match_device(func, drv);
138 	if (!id)
139 		return -ENODEV;
140 
141 	ret = dev_pm_domain_attach(dev, false);
142 	if (ret)
143 		return ret;
144 
145 	/* Unbound SDIO functions are always suspended.
146 	 * During probe, the function is set active and the usage count
147 	 * is incremented.  If the driver supports runtime PM,
148 	 * it should call pm_runtime_put_noidle() in its probe routine and
149 	 * pm_runtime_get_noresume() in its remove routine.
150 	 */
151 	if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD) {
152 		ret = pm_runtime_get_sync(dev);
153 		if (ret < 0)
154 			goto disable_runtimepm;
155 	}
156 
157 	/* Set the default block size so the driver is sure it's something
158 	 * sensible. */
159 	sdio_claim_host(func);
160 	ret = sdio_set_block_size(func, 0);
161 	sdio_release_host(func);
162 	if (ret)
163 		goto disable_runtimepm;
164 
165 	ret = drv->probe(func, id);
166 	if (ret)
167 		goto disable_runtimepm;
168 
169 	return 0;
170 
171 disable_runtimepm:
172 	if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
173 		pm_runtime_put_noidle(dev);
174 	dev_pm_domain_detach(dev, false);
175 	return ret;
176 }
177 
178 static int sdio_bus_remove(struct device *dev)
179 {
180 	struct sdio_driver *drv = to_sdio_driver(dev->driver);
181 	struct sdio_func *func = dev_to_sdio_func(dev);
182 
183 	/* Make sure card is powered before invoking ->remove() */
184 	if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
185 		pm_runtime_get_sync(dev);
186 
187 	drv->remove(func);
188 
189 	if (func->irq_handler) {
190 		pr_warn("WARNING: driver %s did not remove its interrupt handler!\n",
191 			drv->name);
192 		sdio_claim_host(func);
193 		sdio_release_irq(func);
194 		sdio_release_host(func);
195 	}
196 
197 	/* First, undo the increment made directly above */
198 	if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
199 		pm_runtime_put_noidle(dev);
200 
201 	/* Then undo the runtime PM settings in sdio_bus_probe() */
202 	if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
203 		pm_runtime_put_sync(dev);
204 
205 	dev_pm_domain_detach(dev, false);
206 
207 	return 0;
208 }
209 
210 static const struct dev_pm_ops sdio_bus_pm_ops = {
211 	SET_SYSTEM_SLEEP_PM_OPS(pm_generic_suspend, pm_generic_resume)
212 	SET_RUNTIME_PM_OPS(
213 		pm_generic_runtime_suspend,
214 		pm_generic_runtime_resume,
215 		NULL
216 	)
217 };
218 
219 static struct bus_type sdio_bus_type = {
220 	.name		= "sdio",
221 	.dev_groups	= sdio_dev_groups,
222 	.match		= sdio_bus_match,
223 	.uevent		= sdio_bus_uevent,
224 	.probe		= sdio_bus_probe,
225 	.remove		= sdio_bus_remove,
226 	.pm		= &sdio_bus_pm_ops,
227 };
228 
229 int sdio_register_bus(void)
230 {
231 	return bus_register(&sdio_bus_type);
232 }
233 
234 void sdio_unregister_bus(void)
235 {
236 	bus_unregister(&sdio_bus_type);
237 }
238 
239 /**
240  *	sdio_register_driver - register a function driver
241  *	@drv: SDIO function driver
242  */
243 int sdio_register_driver(struct sdio_driver *drv)
244 {
245 	drv->drv.name = drv->name;
246 	drv->drv.bus = &sdio_bus_type;
247 	return driver_register(&drv->drv);
248 }
249 EXPORT_SYMBOL_GPL(sdio_register_driver);
250 
251 /**
252  *	sdio_unregister_driver - unregister a function driver
253  *	@drv: SDIO function driver
254  */
255 void sdio_unregister_driver(struct sdio_driver *drv)
256 {
257 	drv->drv.bus = &sdio_bus_type;
258 	driver_unregister(&drv->drv);
259 }
260 EXPORT_SYMBOL_GPL(sdio_unregister_driver);
261 
262 static void sdio_release_func(struct device *dev)
263 {
264 	struct sdio_func *func = dev_to_sdio_func(dev);
265 
266 	sdio_free_func_cis(func);
267 
268 	kfree(func->info);
269 	kfree(func->tmpbuf);
270 	kfree(func);
271 }
272 
273 /*
274  * Allocate and initialise a new SDIO function structure.
275  */
276 struct sdio_func *sdio_alloc_func(struct mmc_card *card)
277 {
278 	struct sdio_func *func;
279 
280 	func = kzalloc(sizeof(struct sdio_func), GFP_KERNEL);
281 	if (!func)
282 		return ERR_PTR(-ENOMEM);
283 
284 	/*
285 	 * allocate buffer separately to make sure it's properly aligned for
286 	 * DMA usage (incl. 64 bit DMA)
287 	 */
288 	func->tmpbuf = kmalloc(4, GFP_KERNEL);
289 	if (!func->tmpbuf) {
290 		kfree(func);
291 		return ERR_PTR(-ENOMEM);
292 	}
293 
294 	func->card = card;
295 
296 	device_initialize(&func->dev);
297 
298 	func->dev.parent = &card->dev;
299 	func->dev.bus = &sdio_bus_type;
300 	func->dev.release = sdio_release_func;
301 
302 	return func;
303 }
304 
305 #ifdef CONFIG_ACPI
306 static void sdio_acpi_set_handle(struct sdio_func *func)
307 {
308 	struct mmc_host *host = func->card->host;
309 	u64 addr = ((u64)host->slotno << 16) | func->num;
310 
311 	acpi_preset_companion(&func->dev, ACPI_COMPANION(host->parent), addr);
312 }
313 #else
314 static inline void sdio_acpi_set_handle(struct sdio_func *func) {}
315 #endif
316 
317 static void sdio_set_of_node(struct sdio_func *func)
318 {
319 	struct mmc_host *host = func->card->host;
320 
321 	func->dev.of_node = mmc_of_find_child_device(host, func->num);
322 }
323 
324 /*
325  * Register a new SDIO function with the driver model.
326  */
327 int sdio_add_func(struct sdio_func *func)
328 {
329 	int ret;
330 
331 	dev_set_name(&func->dev, "%s:%d", mmc_card_id(func->card), func->num);
332 
333 	sdio_set_of_node(func);
334 	sdio_acpi_set_handle(func);
335 	device_enable_async_suspend(&func->dev);
336 	ret = device_add(&func->dev);
337 	if (ret == 0)
338 		sdio_func_set_present(func);
339 
340 	return ret;
341 }
342 
343 /*
344  * Unregister a SDIO function with the driver model, and
345  * (eventually) free it.
346  * This function can be called through error paths where sdio_add_func() was
347  * never executed (because a failure occurred at an earlier point).
348  */
349 void sdio_remove_func(struct sdio_func *func)
350 {
351 	if (!sdio_func_present(func))
352 		return;
353 
354 	device_del(&func->dev);
355 	of_node_put(func->dev.of_node);
356 	put_device(&func->dev);
357 }
358 
359