xref: /openbmc/linux/drivers/mmc/core/sdio_bus.c (revision 015d239a) 
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  linux/drivers/mmc/core/sdio_bus.c
4  *
5  *  Copyright 2007 Pierre Ossman
6  *
7  * SDIO function driver model
8  */
9 
10 #include <linux/device.h>
11 #include <linux/err.h>
12 #include <linux/export.h>
13 #include <linux/slab.h>
14 #include <linux/pm_runtime.h>
15 #include <linux/pm_domain.h>
16 #include <linux/acpi.h>
17 
18 #include <linux/mmc/card.h>
19 #include <linux/mmc/host.h>
20 #include <linux/mmc/sdio_func.h>
21 #include <linux/of.h>
22 
23 #include "core.h"
24 #include "card.h"
25 #include "sdio_cis.h"
26 #include "sdio_bus.h"
27 
28 #define to_sdio_driver(d)	container_of(d, struct sdio_driver, drv)
29 
30 /* show configuration fields */
31 #define sdio_config_attr(field, format_string)				\
32 static ssize_t								\
33 field##_show(struct device *dev, struct device_attribute *attr, char *buf)				\
34 {									\
35 	struct sdio_func *func;						\
36 									\
37 	func = dev_to_sdio_func (dev);					\
38 	return sprintf (buf, format_string, func->field);		\
39 }									\
40 static DEVICE_ATTR_RO(field)
41 
42 sdio_config_attr(class, "0x%02x\n");
43 sdio_config_attr(vendor, "0x%04x\n");
44 sdio_config_attr(device, "0x%04x\n");
45 
46 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
47 {
48 	struct sdio_func *func = dev_to_sdio_func (dev);
49 
50 	return sprintf(buf, "sdio:c%02Xv%04Xd%04X\n",
51 			func->class, func->vendor, func->device);
52 }
53 static DEVICE_ATTR_RO(modalias);
54 
55 static struct attribute *sdio_dev_attrs[] = {
56 	&dev_attr_class.attr,
57 	&dev_attr_vendor.attr,
58 	&dev_attr_device.attr,
59 	&dev_attr_modalias.attr,
60 	NULL,
61 };
62 ATTRIBUTE_GROUPS(sdio_dev);
63 
64 static const struct sdio_device_id *sdio_match_one(struct sdio_func *func,
65 	const struct sdio_device_id *id)
66 {
67 	if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class)
68 		return NULL;
69 	if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor)
70 		return NULL;
71 	if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device)
72 		return NULL;
73 	return id;
74 }
75 
76 static const struct sdio_device_id *sdio_match_device(struct sdio_func *func,
77 	struct sdio_driver *sdrv)
78 {
79 	const struct sdio_device_id *ids;
80 
81 	ids = sdrv->id_table;
82 
83 	if (ids) {
84 		while (ids->class || ids->vendor || ids->device) {
85 			if (sdio_match_one(func, ids))
86 				return ids;
87 			ids++;
88 		}
89 	}
90 
91 	return NULL;
92 }
93 
94 static int sdio_bus_match(struct device *dev, struct device_driver *drv)
95 {
96 	struct sdio_func *func = dev_to_sdio_func(dev);
97 	struct sdio_driver *sdrv = to_sdio_driver(drv);
98 
99 	if (sdio_match_device(func, sdrv))
100 		return 1;
101 
102 	return 0;
103 }
104 
105 static int
106 sdio_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
107 {
108 	struct sdio_func *func = dev_to_sdio_func(dev);
109 
110 	if (add_uevent_var(env,
111 			"SDIO_CLASS=%02X", func->class))
112 		return -ENOMEM;
113 
114 	if (add_uevent_var(env,
115 			"SDIO_ID=%04X:%04X", func->vendor, func->device))
116 		return -ENOMEM;
117 
118 	if (add_uevent_var(env,
119 			"MODALIAS=sdio:c%02Xv%04Xd%04X",
120 			func->class, func->vendor, func->device))
121 		return -ENOMEM;
122 
123 	return 0;
124 }
125 
126 static int sdio_bus_probe(struct device *dev)
127 {
128 	struct sdio_driver *drv = to_sdio_driver(dev->driver);
129 	struct sdio_func *func = dev_to_sdio_func(dev);
130 	const struct sdio_device_id *id;
131 	int ret;
132 
133 	id = sdio_match_device(func, drv);
134 	if (!id)
135 		return -ENODEV;
136 
137 	ret = dev_pm_domain_attach(dev, false);
138 	if (ret)
139 		return ret;
140 
141 	atomic_inc(&func->card->sdio_funcs_probed);
142 
143 	/* Unbound SDIO functions are always suspended.
144 	 * During probe, the function is set active and the usage count
145 	 * is incremented.  If the driver supports runtime PM,
146 	 * it should call pm_runtime_put_noidle() in its probe routine and
147 	 * pm_runtime_get_noresume() in its remove routine.
148 	 */
149 	if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD) {
150 		ret = pm_runtime_get_sync(dev);
151 		if (ret < 0)
152 			goto disable_runtimepm;
153 	}
154 
155 	/* Set the default block size so the driver is sure it's something
156 	 * sensible. */
157 	sdio_claim_host(func);
158 	if (mmc_card_removed(func->card))
159 		ret = -ENOMEDIUM;
160 	else
161 		ret = sdio_set_block_size(func, 0);
162 	sdio_release_host(func);
163 	if (ret)
164 		goto disable_runtimepm;
165 
166 	ret = drv->probe(func, id);
167 	if (ret)
168 		goto disable_runtimepm;
169 
170 	return 0;
171 
172 disable_runtimepm:
173 	atomic_dec(&func->card->sdio_funcs_probed);
174 	if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
175 		pm_runtime_put_noidle(dev);
176 	dev_pm_domain_detach(dev, false);
177 	return ret;
178 }
179 
180 static int sdio_bus_remove(struct device *dev)
181 {
182 	struct sdio_driver *drv = to_sdio_driver(dev->driver);
183 	struct sdio_func *func = dev_to_sdio_func(dev);
184 
185 	/* Make sure card is powered before invoking ->remove() */
186 	if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
187 		pm_runtime_get_sync(dev);
188 
189 	drv->remove(func);
190 	atomic_dec(&func->card->sdio_funcs_probed);
191 
192 	if (func->irq_handler) {
193 		pr_warn("WARNING: driver %s did not remove its interrupt handler!\n",
194 			drv->name);
195 		sdio_claim_host(func);
196 		sdio_release_irq(func);
197 		sdio_release_host(func);
198 	}
199 
200 	/* First, undo the increment made directly above */
201 	if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
202 		pm_runtime_put_noidle(dev);
203 
204 	/* Then undo the runtime PM settings in sdio_bus_probe() */
205 	if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
206 		pm_runtime_put_sync(dev);
207 
208 	dev_pm_domain_detach(dev, false);
209 
210 	return 0;
211 }
212 
213 static const struct dev_pm_ops sdio_bus_pm_ops = {
214 	SET_SYSTEM_SLEEP_PM_OPS(pm_generic_suspend, pm_generic_resume)
215 	SET_RUNTIME_PM_OPS(
216 		pm_generic_runtime_suspend,
217 		pm_generic_runtime_resume,
218 		NULL
219 	)
220 };
221 
222 static struct bus_type sdio_bus_type = {
223 	.name		= "sdio",
224 	.dev_groups	= sdio_dev_groups,
225 	.match		= sdio_bus_match,
226 	.uevent		= sdio_bus_uevent,
227 	.probe		= sdio_bus_probe,
228 	.remove		= sdio_bus_remove,
229 	.pm		= &sdio_bus_pm_ops,
230 };
231 
232 int sdio_register_bus(void)
233 {
234 	return bus_register(&sdio_bus_type);
235 }
236 
237 void sdio_unregister_bus(void)
238 {
239 	bus_unregister(&sdio_bus_type);
240 }
241 
242 /**
243  *	sdio_register_driver - register a function driver
244  *	@drv: SDIO function driver
245  */
246 int sdio_register_driver(struct sdio_driver *drv)
247 {
248 	drv->drv.name = drv->name;
249 	drv->drv.bus = &sdio_bus_type;
250 	return driver_register(&drv->drv);
251 }
252 EXPORT_SYMBOL_GPL(sdio_register_driver);
253 
254 /**
255  *	sdio_unregister_driver - unregister a function driver
256  *	@drv: SDIO function driver
257  */
258 void sdio_unregister_driver(struct sdio_driver *drv)
259 {
260 	drv->drv.bus = &sdio_bus_type;
261 	driver_unregister(&drv->drv);
262 }
263 EXPORT_SYMBOL_GPL(sdio_unregister_driver);
264 
265 static void sdio_release_func(struct device *dev)
266 {
267 	struct sdio_func *func = dev_to_sdio_func(dev);
268 
269 	sdio_free_func_cis(func);
270 
271 	kfree(func->info);
272 	kfree(func->tmpbuf);
273 	kfree(func);
274 }
275 
276 /*
277  * Allocate and initialise a new SDIO function structure.
278  */
279 struct sdio_func *sdio_alloc_func(struct mmc_card *card)
280 {
281 	struct sdio_func *func;
282 
283 	func = kzalloc(sizeof(struct sdio_func), GFP_KERNEL);
284 	if (!func)
285 		return ERR_PTR(-ENOMEM);
286 
287 	/*
288 	 * allocate buffer separately to make sure it's properly aligned for
289 	 * DMA usage (incl. 64 bit DMA)
290 	 */
291 	func->tmpbuf = kmalloc(4, GFP_KERNEL);
292 	if (!func->tmpbuf) {
293 		kfree(func);
294 		return ERR_PTR(-ENOMEM);
295 	}
296 
297 	func->card = card;
298 
299 	device_initialize(&func->dev);
300 
301 	func->dev.parent = &card->dev;
302 	func->dev.bus = &sdio_bus_type;
303 	func->dev.release = sdio_release_func;
304 
305 	return func;
306 }
307 
308 #ifdef CONFIG_ACPI
309 static void sdio_acpi_set_handle(struct sdio_func *func)
310 {
311 	struct mmc_host *host = func->card->host;
312 	u64 addr = ((u64)host->slotno << 16) | func->num;
313 
314 	acpi_preset_companion(&func->dev, ACPI_COMPANION(host->parent), addr);
315 }
316 #else
317 static inline void sdio_acpi_set_handle(struct sdio_func *func) {}
318 #endif
319 
320 static void sdio_set_of_node(struct sdio_func *func)
321 {
322 	struct mmc_host *host = func->card->host;
323 
324 	func->dev.of_node = mmc_of_find_child_device(host, func->num);
325 }
326 
327 /*
328  * Register a new SDIO function with the driver model.
329  */
330 int sdio_add_func(struct sdio_func *func)
331 {
332 	int ret;
333 
334 	dev_set_name(&func->dev, "%s:%d", mmc_card_id(func->card), func->num);
335 
336 	sdio_set_of_node(func);
337 	sdio_acpi_set_handle(func);
338 	device_enable_async_suspend(&func->dev);
339 	ret = device_add(&func->dev);
340 	if (ret == 0)
341 		sdio_func_set_present(func);
342 
343 	return ret;
344 }
345 
346 /*
347  * Unregister a SDIO function with the driver model, and
348  * (eventually) free it.
349  * This function can be called through error paths where sdio_add_func() was
350  * never executed (because a failure occurred at an earlier point).
351  */
352 void sdio_remove_func(struct sdio_func *func)
353 {
354 	if (!sdio_func_present(func))
355 		return;
356 
357 	device_del(&func->dev);
358 	of_node_put(func->dev.of_node);
359 	put_device(&func->dev);
360 }
361 
362