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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#include <linux/sysfs.h>
18
19#include <linux/mmc/card.h>
20#include <linux/mmc/host.h>
21#include <linux/mmc/sdio_func.h>
22#include <linux/of.h>
23
24#include "core.h"
25#include "card.h"
26#include "sdio_cis.h"
27#include "sdio_bus.h"
28
29#define to_sdio_driver(d) container_of(d, struct sdio_driver, drv)
30
31/* show configuration fields */
32#define sdio_config_attr(field, format_string, args...) \
33static ssize_t \
34field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
35{ \
36 struct sdio_func *func; \
37 \
38 func = dev_to_sdio_func (dev); \
39 return sysfs_emit(buf, format_string, args); \
40} \
41static DEVICE_ATTR_RO(field)
42
43sdio_config_attr(class, "0x%02x\n", func->class);
44sdio_config_attr(vendor, "0x%04x\n", func->vendor);
45sdio_config_attr(device, "0x%04x\n", func->device);
46sdio_config_attr(revision, "%u.%u\n", func->major_rev, func->minor_rev);
47sdio_config_attr(modalias, "sdio:c%02Xv%04Xd%04X\n", func->class, func->vendor, func->device);
48
49#define sdio_info_attr(num) \
50static ssize_t info##num##_show(struct device *dev, struct device_attribute *attr, char *buf) \
51{ \
52 struct sdio_func *func = dev_to_sdio_func(dev); \
53 \
54 if (num > func->num_info) \
55 return -ENODATA; \
56 if (!func->info[num - 1][0]) \
57 return 0; \
58 return sysfs_emit(buf, "%s\n", func->info[num - 1]); \
59} \
60static DEVICE_ATTR_RO(info##num)
61
62sdio_info_attr(1);
63sdio_info_attr(2);
64sdio_info_attr(3);
65sdio_info_attr(4);
66
67static struct attribute *sdio_dev_attrs[] = {
68 &dev_attr_class.attr,
69 &dev_attr_vendor.attr,
70 &dev_attr_device.attr,
71 &dev_attr_revision.attr,
72 &dev_attr_info1.attr,
73 &dev_attr_info2.attr,
74 &dev_attr_info3.attr,
75 &dev_attr_info4.attr,
76 &dev_attr_modalias.attr,
77 NULL,
78};
79ATTRIBUTE_GROUPS(sdio_dev);
80
81static const struct sdio_device_id *sdio_match_one(struct sdio_func *func,
82 const struct sdio_device_id *id)
83{
84 if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class)
85 return NULL;
86 if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor)
87 return NULL;
88 if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device)
89 return NULL;
90 return id;
91}
92
93static const struct sdio_device_id *sdio_match_device(struct sdio_func *func,
94 struct sdio_driver *sdrv)
95{
96 const struct sdio_device_id *ids;
97
98 ids = sdrv->id_table;
99
100 if (ids) {
101 while (ids->class || ids->vendor || ids->device) {
102 if (sdio_match_one(func, ids))
103 return ids;
104 ids++;
105 }
106 }
107
108 return NULL;
109}
110
111static int sdio_bus_match(struct device *dev, struct device_driver *drv)
112{
113 struct sdio_func *func = dev_to_sdio_func(dev);
114 struct sdio_driver *sdrv = to_sdio_driver(drv);
115
116 if (sdio_match_device(func, sdrv))
117 return 1;
118
119 return 0;
120}
121
122static int
123sdio_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
124{
125 const struct sdio_func *func = dev_to_sdio_func(dev);
126 unsigned int i;
127
128 if (add_uevent_var(env,
129 "SDIO_CLASS=%02X", func->class))
130 return -ENOMEM;
131
132 if (add_uevent_var(env,
133 "SDIO_ID=%04X:%04X", func->vendor, func->device))
134 return -ENOMEM;
135
136 if (add_uevent_var(env,
137 "SDIO_REVISION=%u.%u", func->major_rev, func->minor_rev))
138 return -ENOMEM;
139
140 for (i = 0; i < func->num_info; i++) {
141 if (add_uevent_var(env, "SDIO_INFO%u=%s", i+1, func->info[i]))
142 return -ENOMEM;
143 }
144
145 if (add_uevent_var(env,
146 "MODALIAS=sdio:c%02Xv%04Xd%04X",
147 func->class, func->vendor, func->device))
148 return -ENOMEM;
149
150 return 0;
151}
152
153static int sdio_bus_probe(struct device *dev)
154{
155 struct sdio_driver *drv = to_sdio_driver(dev->driver);
156 struct sdio_func *func = dev_to_sdio_func(dev);
157 const struct sdio_device_id *id;
158 int ret;
159
160 id = sdio_match_device(func, drv);
161 if (!id)
162 return -ENODEV;
163
164 ret = dev_pm_domain_attach(dev, false);
165 if (ret)
166 return ret;
167
168 atomic_inc(&func->card->sdio_funcs_probed);
169
170 /* Unbound SDIO functions are always suspended.
171 * During probe, the function is set active and the usage count
172 * is incremented. If the driver supports runtime PM,
173 * it should call pm_runtime_put_noidle() in its probe routine and
174 * pm_runtime_get_noresume() in its remove routine.
175 */
176 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD) {
177 ret = pm_runtime_get_sync(dev);
178 if (ret < 0)
179 goto disable_runtimepm;
180 }
181
182 /* Set the default block size so the driver is sure it's something
183 * sensible. */
184 sdio_claim_host(func);
185 if (mmc_card_removed(func->card))
186 ret = -ENOMEDIUM;
187 else
188 ret = sdio_set_block_size(func, 0);
189 sdio_release_host(func);
190 if (ret)
191 goto disable_runtimepm;
192
193 ret = drv->probe(func, id);
194 if (ret)
195 goto disable_runtimepm;
196
197 return 0;
198
199disable_runtimepm:
200 atomic_dec(&func->card->sdio_funcs_probed);
201 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
202 pm_runtime_put_noidle(dev);
203 dev_pm_domain_detach(dev, false);
204 return ret;
205}
206
207static void sdio_bus_remove(struct device *dev)
208{
209 struct sdio_driver *drv = to_sdio_driver(dev->driver);
210 struct sdio_func *func = dev_to_sdio_func(dev);
211
212 /* Make sure card is powered before invoking ->remove() */
213 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
214 pm_runtime_get_sync(dev);
215
216 drv->remove(func);
217 atomic_dec(&func->card->sdio_funcs_probed);
218
219 if (func->irq_handler) {
220 pr_warn("WARNING: driver %s did not remove its interrupt handler!\n",
221 drv->name);
222 sdio_claim_host(func);
223 sdio_release_irq(func);
224 sdio_release_host(func);
225 }
226
227 /* First, undo the increment made directly above */
228 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
229 pm_runtime_put_noidle(dev);
230
231 /* Then undo the runtime PM settings in sdio_bus_probe() */
232 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
233 pm_runtime_put_sync(dev);
234
235 dev_pm_domain_detach(dev, false);
236}
237
238static const struct dev_pm_ops sdio_bus_pm_ops = {
239 SET_SYSTEM_SLEEP_PM_OPS(pm_generic_suspend, pm_generic_resume)
240 SET_RUNTIME_PM_OPS(
241 pm_generic_runtime_suspend,
242 pm_generic_runtime_resume,
243 NULL
244 )
245};
246
247static struct bus_type sdio_bus_type = {
248 .name = "sdio",
249 .dev_groups = sdio_dev_groups,
250 .match = sdio_bus_match,
251 .uevent = sdio_bus_uevent,
252 .probe = sdio_bus_probe,
253 .remove = sdio_bus_remove,
254 .pm = &sdio_bus_pm_ops,
255};
256
257int sdio_register_bus(void)
258{
259 return bus_register(&sdio_bus_type);
260}
261
262void sdio_unregister_bus(void)
263{
264 bus_unregister(&sdio_bus_type);
265}
266
267/**
268 * sdio_register_driver - register a function driver
269 * @drv: SDIO function driver
270 */
271int sdio_register_driver(struct sdio_driver *drv)
272{
273 drv->drv.name = drv->name;
274 drv->drv.bus = &sdio_bus_type;
275 return driver_register(&drv->drv);
276}
277EXPORT_SYMBOL_GPL(sdio_register_driver);
278
279/**
280 * sdio_unregister_driver - unregister a function driver
281 * @drv: SDIO function driver
282 */
283void sdio_unregister_driver(struct sdio_driver *drv)
284{
285 drv->drv.bus = &sdio_bus_type;
286 driver_unregister(&drv->drv);
287}
288EXPORT_SYMBOL_GPL(sdio_unregister_driver);
289
290static void sdio_release_func(struct device *dev)
291{
292 struct sdio_func *func = dev_to_sdio_func(dev);
293
294 if (!(func->card->quirks & MMC_QUIRK_NONSTD_SDIO))
295 sdio_free_func_cis(func);
296
297 /*
298 * We have now removed the link to the tuples in the
299 * card structure, so remove the reference.
300 */
301 put_device(&func->card->dev);
302
303 kfree(func->info);
304 kfree(func->tmpbuf);
305 kfree(func);
306}
307
308/*
309 * Allocate and initialise a new SDIO function structure.
310 */
311struct sdio_func *sdio_alloc_func(struct mmc_card *card)
312{
313 struct sdio_func *func;
314
315 func = kzalloc(sizeof(struct sdio_func), GFP_KERNEL);
316 if (!func)
317 return ERR_PTR(-ENOMEM);
318
319 /*
320 * allocate buffer separately to make sure it's properly aligned for
321 * DMA usage (incl. 64 bit DMA)
322 */
323 func->tmpbuf = kmalloc(4, GFP_KERNEL);
324 if (!func->tmpbuf) {
325 kfree(func);
326 return ERR_PTR(-ENOMEM);
327 }
328
329 func->card = card;
330
331 device_initialize(&func->dev);
332
333 /*
334 * We may link to tuples in the card structure,
335 * we need make sure we have a reference to it.
336 */
337 get_device(&func->card->dev);
338
339 func->dev.parent = &card->dev;
340 func->dev.bus = &sdio_bus_type;
341 func->dev.release = sdio_release_func;
342
343 return func;
344}
345
346#ifdef CONFIG_ACPI
347static void sdio_acpi_set_handle(struct sdio_func *func)
348{
349 struct mmc_host *host = func->card->host;
350 u64 addr = ((u64)host->slotno << 16) | func->num;
351
352 acpi_preset_companion(&func->dev, ACPI_COMPANION(host->parent), addr);
353}
354#else
355static inline void sdio_acpi_set_handle(struct sdio_func *func) {}
356#endif
357
358static void sdio_set_of_node(struct sdio_func *func)
359{
360 struct mmc_host *host = func->card->host;
361
362 func->dev.of_node = mmc_of_find_child_device(host, func->num);
363}
364
365/*
366 * Register a new SDIO function with the driver model.
367 */
368int sdio_add_func(struct sdio_func *func)
369{
370 int ret;
371
372 dev_set_name(&func->dev, "%s:%d", mmc_card_id(func->card), func->num);
373
374 sdio_set_of_node(func);
375 sdio_acpi_set_handle(func);
376 device_enable_async_suspend(&func->dev);
377 ret = device_add(&func->dev);
378 if (ret == 0)
379 sdio_func_set_present(func);
380
381 return ret;
382}
383
384/*
385 * Unregister a SDIO function with the driver model, and
386 * (eventually) free it.
387 * This function can be called through error paths where sdio_add_func() was
388 * never executed (because a failure occurred at an earlier point).
389 */
390void sdio_remove_func(struct sdio_func *func)
391{
392 if (sdio_func_present(func))
393 device_del(&func->dev);
394
395 of_node_put(func->dev.of_node);
396 put_device(&func->dev);
397}
398
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/slab.h>
17#include <linux/pm_runtime.h>
18
19#include <linux/mmc/card.h>
20#include <linux/mmc/host.h>
21#include <linux/mmc/sdio_func.h>
22
23#include "sdio_cis.h"
24#include "sdio_bus.h"
25
26/* show configuration fields */
27#define sdio_config_attr(field, format_string) \
28static ssize_t \
29field##_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
37sdio_config_attr(class, "0x%02x\n");
38sdio_config_attr(vendor, "0x%04x\n");
39sdio_config_attr(device, "0x%04x\n");
40
41static 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
49static 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
57static 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
69static 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
87static 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
98static int
99sdio_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
119static 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 /* Unbound SDIO functions are always suspended.
131 * During probe, the function is set active and the usage count
132 * is incremented. If the driver supports runtime PM,
133 * it should call pm_runtime_put_noidle() in its probe routine and
134 * pm_runtime_get_noresume() in its remove routine.
135 */
136 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD) {
137 ret = pm_runtime_get_sync(dev);
138 if (ret < 0)
139 goto out;
140 }
141
142 /* Set the default block size so the driver is sure it's something
143 * sensible. */
144 sdio_claim_host(func);
145 ret = sdio_set_block_size(func, 0);
146 sdio_release_host(func);
147 if (ret)
148 goto disable_runtimepm;
149
150 ret = drv->probe(func, id);
151 if (ret)
152 goto disable_runtimepm;
153
154 return 0;
155
156disable_runtimepm:
157 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
158 pm_runtime_put_noidle(dev);
159out:
160 return ret;
161}
162
163static int sdio_bus_remove(struct device *dev)
164{
165 struct sdio_driver *drv = to_sdio_driver(dev->driver);
166 struct sdio_func *func = dev_to_sdio_func(dev);
167 int ret = 0;
168
169 /* Make sure card is powered before invoking ->remove() */
170 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
171 pm_runtime_get_sync(dev);
172
173 drv->remove(func);
174
175 if (func->irq_handler) {
176 printk(KERN_WARNING "WARNING: driver %s did not remove "
177 "its interrupt handler!\n", drv->name);
178 sdio_claim_host(func);
179 sdio_release_irq(func);
180 sdio_release_host(func);
181 }
182
183 /* First, undo the increment made directly above */
184 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
185 pm_runtime_put_noidle(dev);
186
187 /* Then undo the runtime PM settings in sdio_bus_probe() */
188 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
189 pm_runtime_put_sync(dev);
190
191 return ret;
192}
193
194#ifdef CONFIG_PM_RUNTIME
195
196static const struct dev_pm_ops sdio_bus_pm_ops = {
197 SET_RUNTIME_PM_OPS(
198 pm_generic_runtime_suspend,
199 pm_generic_runtime_resume,
200 pm_generic_runtime_idle
201 )
202};
203
204#define SDIO_PM_OPS_PTR (&sdio_bus_pm_ops)
205
206#else /* !CONFIG_PM_RUNTIME */
207
208#define SDIO_PM_OPS_PTR NULL
209
210#endif /* !CONFIG_PM_RUNTIME */
211
212static struct bus_type sdio_bus_type = {
213 .name = "sdio",
214 .dev_attrs = sdio_dev_attrs,
215 .match = sdio_bus_match,
216 .uevent = sdio_bus_uevent,
217 .probe = sdio_bus_probe,
218 .remove = sdio_bus_remove,
219 .pm = SDIO_PM_OPS_PTR,
220};
221
222int sdio_register_bus(void)
223{
224 return bus_register(&sdio_bus_type);
225}
226
227void sdio_unregister_bus(void)
228{
229 bus_unregister(&sdio_bus_type);
230}
231
232/**
233 * sdio_register_driver - register a function driver
234 * @drv: SDIO function driver
235 */
236int sdio_register_driver(struct sdio_driver *drv)
237{
238 drv->drv.name = drv->name;
239 drv->drv.bus = &sdio_bus_type;
240 return driver_register(&drv->drv);
241}
242EXPORT_SYMBOL_GPL(sdio_register_driver);
243
244/**
245 * sdio_unregister_driver - unregister a function driver
246 * @drv: SDIO function driver
247 */
248void sdio_unregister_driver(struct sdio_driver *drv)
249{
250 drv->drv.bus = &sdio_bus_type;
251 driver_unregister(&drv->drv);
252}
253EXPORT_SYMBOL_GPL(sdio_unregister_driver);
254
255static void sdio_release_func(struct device *dev)
256{
257 struct sdio_func *func = dev_to_sdio_func(dev);
258
259 sdio_free_func_cis(func);
260
261 if (func->info)
262 kfree(func->info);
263
264 kfree(func);
265}
266
267/*
268 * Allocate and initialise a new SDIO function structure.
269 */
270struct sdio_func *sdio_alloc_func(struct mmc_card *card)
271{
272 struct sdio_func *func;
273
274 func = kzalloc(sizeof(struct sdio_func), GFP_KERNEL);
275 if (!func)
276 return ERR_PTR(-ENOMEM);
277
278 func->card = card;
279
280 device_initialize(&func->dev);
281
282 func->dev.parent = &card->dev;
283 func->dev.bus = &sdio_bus_type;
284 func->dev.release = sdio_release_func;
285
286 return func;
287}
288
289/*
290 * Register a new SDIO function with the driver model.
291 */
292int sdio_add_func(struct sdio_func *func)
293{
294 int ret;
295
296 dev_set_name(&func->dev, "%s:%d", mmc_card_id(func->card), func->num);
297
298 ret = device_add(&func->dev);
299 if (ret == 0)
300 sdio_func_set_present(func);
301
302 return ret;
303}
304
305/*
306 * Unregister a SDIO function with the driver model, and
307 * (eventually) free it.
308 * This function can be called through error paths where sdio_add_func() was
309 * never executed (because a failure occurred at an earlier point).
310 */
311void sdio_remove_func(struct sdio_func *func)
312{
313 if (!sdio_func_present(func))
314 return;
315
316 device_del(&func->dev);
317 put_device(&func->dev);
318}
319