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