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b31384fa RW |
1 | /* |
2 | * property.c - Unified device property interface. | |
3 | * | |
4 | * Copyright (C) 2014, Intel Corporation | |
5 | * Authors: Rafael J. Wysocki <rafael.j.wysocki@intel.com> | |
6 | * Mika Westerberg <mika.westerberg@linux.intel.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
b31384fa | 13 | #include <linux/acpi.h> |
16ba08d5 RW |
14 | #include <linux/export.h> |
15 | #include <linux/kernel.h> | |
b31384fa | 16 | #include <linux/of.h> |
05ca5560 | 17 | #include <linux/of_address.h> |
16ba08d5 | 18 | #include <linux/property.h> |
4c96b7dc JL |
19 | #include <linux/etherdevice.h> |
20 | #include <linux/phy.h> | |
16ba08d5 RW |
21 | |
22 | /** | |
23 | * device_add_property_set - Add a collection of properties to a device object. | |
24 | * @dev: Device to add properties to. | |
25 | * @pset: Collection of properties to add. | |
26 | * | |
27 | * Associate a collection of device properties represented by @pset with @dev | |
28 | * as its secondary firmware node. | |
29 | */ | |
30 | void device_add_property_set(struct device *dev, struct property_set *pset) | |
31 | { | |
32 | if (pset) | |
33 | pset->fwnode.type = FWNODE_PDATA; | |
34 | ||
35 | set_secondary_fwnode(dev, &pset->fwnode); | |
36 | } | |
37 | EXPORT_SYMBOL_GPL(device_add_property_set); | |
38 | ||
39 | static inline bool is_pset(struct fwnode_handle *fwnode) | |
40 | { | |
41 | return fwnode && fwnode->type == FWNODE_PDATA; | |
42 | } | |
43 | ||
44 | static inline struct property_set *to_pset(struct fwnode_handle *fwnode) | |
45 | { | |
46 | return is_pset(fwnode) ? | |
47 | container_of(fwnode, struct property_set, fwnode) : NULL; | |
48 | } | |
49 | ||
50 | static struct property_entry *pset_prop_get(struct property_set *pset, | |
51 | const char *name) | |
52 | { | |
53 | struct property_entry *prop; | |
54 | ||
55 | if (!pset || !pset->properties) | |
56 | return NULL; | |
57 | ||
58 | for (prop = pset->properties; prop->name; prop++) | |
59 | if (!strcmp(name, prop->name)) | |
60 | return prop; | |
61 | ||
62 | return NULL; | |
63 | } | |
64 | ||
65 | static int pset_prop_read_array(struct property_set *pset, const char *name, | |
66 | enum dev_prop_type type, void *val, size_t nval) | |
67 | { | |
68 | struct property_entry *prop; | |
69 | unsigned int item_size; | |
70 | ||
71 | prop = pset_prop_get(pset, name); | |
72 | if (!prop) | |
73 | return -ENODATA; | |
74 | ||
75 | if (prop->type != type) | |
76 | return -EPROTO; | |
77 | ||
78 | if (!val) | |
79 | return prop->nval; | |
80 | ||
81 | if (prop->nval < nval) | |
82 | return -EOVERFLOW; | |
83 | ||
84 | switch (type) { | |
85 | case DEV_PROP_U8: | |
86 | item_size = sizeof(u8); | |
87 | break; | |
88 | case DEV_PROP_U16: | |
89 | item_size = sizeof(u16); | |
90 | break; | |
91 | case DEV_PROP_U32: | |
92 | item_size = sizeof(u32); | |
93 | break; | |
94 | case DEV_PROP_U64: | |
95 | item_size = sizeof(u64); | |
96 | break; | |
97 | case DEV_PROP_STRING: | |
98 | item_size = sizeof(const char *); | |
99 | break; | |
100 | default: | |
101 | return -EINVAL; | |
102 | } | |
103 | memcpy(val, prop->value.raw_data, nval * item_size); | |
104 | return 0; | |
105 | } | |
b31384fa | 106 | |
9017f252 RW |
107 | static inline struct fwnode_handle *dev_fwnode(struct device *dev) |
108 | { | |
109 | return IS_ENABLED(CONFIG_OF) && dev->of_node ? | |
110 | &dev->of_node->fwnode : dev->fwnode; | |
111 | } | |
b31384fa RW |
112 | |
113 | /** | |
114 | * device_property_present - check if a property of a device is present | |
115 | * @dev: Device whose property is being checked | |
116 | * @propname: Name of the property | |
117 | * | |
118 | * Check if property @propname is present in the device firmware description. | |
119 | */ | |
120 | bool device_property_present(struct device *dev, const char *propname) | |
121 | { | |
9017f252 | 122 | return fwnode_property_present(dev_fwnode(dev), propname); |
b31384fa RW |
123 | } |
124 | EXPORT_SYMBOL_GPL(device_property_present); | |
125 | ||
8a0662d9 RW |
126 | /** |
127 | * fwnode_property_present - check if a property of a firmware node is present | |
128 | * @fwnode: Firmware node whose property to check | |
129 | * @propname: Name of the property | |
130 | */ | |
131 | bool fwnode_property_present(struct fwnode_handle *fwnode, const char *propname) | |
132 | { | |
133 | if (is_of_node(fwnode)) | |
c181fb3e | 134 | return of_property_read_bool(to_of_node(fwnode), propname); |
8a0662d9 | 135 | else if (is_acpi_node(fwnode)) |
c181fb3e | 136 | return !acpi_dev_prop_get(to_acpi_node(fwnode), propname, NULL); |
8a0662d9 | 137 | |
16ba08d5 | 138 | return !!pset_prop_get(to_pset(fwnode), propname); |
8a0662d9 RW |
139 | } |
140 | EXPORT_SYMBOL_GPL(fwnode_property_present); | |
141 | ||
b31384fa RW |
142 | /** |
143 | * device_property_read_u8_array - return a u8 array property of a device | |
144 | * @dev: Device to get the property of | |
145 | * @propname: Name of the property | |
5c0acf3b | 146 | * @val: The values are stored here or %NULL to return the number of values |
b31384fa RW |
147 | * @nval: Size of the @val array |
148 | * | |
149 | * Function reads an array of u8 properties with @propname from the device | |
150 | * firmware description and stores them to @val if found. | |
151 | * | |
5c0acf3b AH |
152 | * Return: number of values if @val was %NULL, |
153 | * %0 if the property was found (success), | |
b31384fa RW |
154 | * %-EINVAL if given arguments are not valid, |
155 | * %-ENODATA if the property does not have a value, | |
156 | * %-EPROTO if the property is not an array of numbers, | |
157 | * %-EOVERFLOW if the size of the property is not as expected. | |
158 | */ | |
159 | int device_property_read_u8_array(struct device *dev, const char *propname, | |
160 | u8 *val, size_t nval) | |
161 | { | |
9017f252 | 162 | return fwnode_property_read_u8_array(dev_fwnode(dev), propname, val, nval); |
b31384fa RW |
163 | } |
164 | EXPORT_SYMBOL_GPL(device_property_read_u8_array); | |
165 | ||
166 | /** | |
167 | * device_property_read_u16_array - return a u16 array property of a device | |
168 | * @dev: Device to get the property of | |
169 | * @propname: Name of the property | |
5c0acf3b | 170 | * @val: The values are stored here or %NULL to return the number of values |
b31384fa RW |
171 | * @nval: Size of the @val array |
172 | * | |
173 | * Function reads an array of u16 properties with @propname from the device | |
174 | * firmware description and stores them to @val if found. | |
175 | * | |
5c0acf3b AH |
176 | * Return: number of values if @val was %NULL, |
177 | * %0 if the property was found (success), | |
b31384fa RW |
178 | * %-EINVAL if given arguments are not valid, |
179 | * %-ENODATA if the property does not have a value, | |
180 | * %-EPROTO if the property is not an array of numbers, | |
181 | * %-EOVERFLOW if the size of the property is not as expected. | |
182 | */ | |
183 | int device_property_read_u16_array(struct device *dev, const char *propname, | |
184 | u16 *val, size_t nval) | |
185 | { | |
9017f252 | 186 | return fwnode_property_read_u16_array(dev_fwnode(dev), propname, val, nval); |
b31384fa RW |
187 | } |
188 | EXPORT_SYMBOL_GPL(device_property_read_u16_array); | |
189 | ||
190 | /** | |
191 | * device_property_read_u32_array - return a u32 array property of a device | |
192 | * @dev: Device to get the property of | |
193 | * @propname: Name of the property | |
5c0acf3b | 194 | * @val: The values are stored here or %NULL to return the number of values |
b31384fa RW |
195 | * @nval: Size of the @val array |
196 | * | |
197 | * Function reads an array of u32 properties with @propname from the device | |
198 | * firmware description and stores them to @val if found. | |
199 | * | |
5c0acf3b AH |
200 | * Return: number of values if @val was %NULL, |
201 | * %0 if the property was found (success), | |
b31384fa RW |
202 | * %-EINVAL if given arguments are not valid, |
203 | * %-ENODATA if the property does not have a value, | |
204 | * %-EPROTO if the property is not an array of numbers, | |
205 | * %-EOVERFLOW if the size of the property is not as expected. | |
206 | */ | |
207 | int device_property_read_u32_array(struct device *dev, const char *propname, | |
208 | u32 *val, size_t nval) | |
209 | { | |
9017f252 | 210 | return fwnode_property_read_u32_array(dev_fwnode(dev), propname, val, nval); |
b31384fa RW |
211 | } |
212 | EXPORT_SYMBOL_GPL(device_property_read_u32_array); | |
213 | ||
214 | /** | |
215 | * device_property_read_u64_array - return a u64 array property of a device | |
216 | * @dev: Device to get the property of | |
217 | * @propname: Name of the property | |
5c0acf3b | 218 | * @val: The values are stored here or %NULL to return the number of values |
b31384fa RW |
219 | * @nval: Size of the @val array |
220 | * | |
221 | * Function reads an array of u64 properties with @propname from the device | |
222 | * firmware description and stores them to @val if found. | |
223 | * | |
5c0acf3b AH |
224 | * Return: number of values if @val was %NULL, |
225 | * %0 if the property was found (success), | |
b31384fa RW |
226 | * %-EINVAL if given arguments are not valid, |
227 | * %-ENODATA if the property does not have a value, | |
228 | * %-EPROTO if the property is not an array of numbers, | |
229 | * %-EOVERFLOW if the size of the property is not as expected. | |
230 | */ | |
231 | int device_property_read_u64_array(struct device *dev, const char *propname, | |
232 | u64 *val, size_t nval) | |
233 | { | |
9017f252 | 234 | return fwnode_property_read_u64_array(dev_fwnode(dev), propname, val, nval); |
b31384fa RW |
235 | } |
236 | EXPORT_SYMBOL_GPL(device_property_read_u64_array); | |
237 | ||
238 | /** | |
239 | * device_property_read_string_array - return a string array property of device | |
240 | * @dev: Device to get the property of | |
241 | * @propname: Name of the property | |
5c0acf3b | 242 | * @val: The values are stored here or %NULL to return the number of values |
b31384fa RW |
243 | * @nval: Size of the @val array |
244 | * | |
245 | * Function reads an array of string properties with @propname from the device | |
246 | * firmware description and stores them to @val if found. | |
247 | * | |
5c0acf3b AH |
248 | * Return: number of values if @val was %NULL, |
249 | * %0 if the property was found (success), | |
b31384fa RW |
250 | * %-EINVAL if given arguments are not valid, |
251 | * %-ENODATA if the property does not have a value, | |
252 | * %-EPROTO or %-EILSEQ if the property is not an array of strings, | |
253 | * %-EOVERFLOW if the size of the property is not as expected. | |
254 | */ | |
255 | int device_property_read_string_array(struct device *dev, const char *propname, | |
256 | const char **val, size_t nval) | |
257 | { | |
9017f252 | 258 | return fwnode_property_read_string_array(dev_fwnode(dev), propname, val, nval); |
b31384fa RW |
259 | } |
260 | EXPORT_SYMBOL_GPL(device_property_read_string_array); | |
261 | ||
262 | /** | |
263 | * device_property_read_string - return a string property of a device | |
264 | * @dev: Device to get the property of | |
265 | * @propname: Name of the property | |
266 | * @val: The value is stored here | |
267 | * | |
268 | * Function reads property @propname from the device firmware description and | |
269 | * stores the value into @val if found. The value is checked to be a string. | |
270 | * | |
271 | * Return: %0 if the property was found (success), | |
272 | * %-EINVAL if given arguments are not valid, | |
273 | * %-ENODATA if the property does not have a value, | |
274 | * %-EPROTO or %-EILSEQ if the property type is not a string. | |
275 | */ | |
276 | int device_property_read_string(struct device *dev, const char *propname, | |
277 | const char **val) | |
278 | { | |
9017f252 | 279 | return fwnode_property_read_string(dev_fwnode(dev), propname, val); |
b31384fa RW |
280 | } |
281 | EXPORT_SYMBOL_GPL(device_property_read_string); | |
8a0662d9 | 282 | |
9017f252 RW |
283 | #define OF_DEV_PROP_READ_ARRAY(node, propname, type, val, nval) \ |
284 | (val) ? of_property_read_##type##_array((node), (propname), (val), (nval)) \ | |
285 | : of_property_count_elems_of_size((node), (propname), sizeof(type)) | |
286 | ||
8a0662d9 RW |
287 | #define FWNODE_PROP_READ_ARRAY(_fwnode_, _propname_, _type_, _proptype_, _val_, _nval_) \ |
288 | ({ \ | |
289 | int _ret_; \ | |
290 | if (is_of_node(_fwnode_)) \ | |
c181fb3e | 291 | _ret_ = OF_DEV_PROP_READ_ARRAY(to_of_node(_fwnode_), _propname_, \ |
8a0662d9 RW |
292 | _type_, _val_, _nval_); \ |
293 | else if (is_acpi_node(_fwnode_)) \ | |
c181fb3e | 294 | _ret_ = acpi_dev_prop_read(to_acpi_node(_fwnode_), _propname_, \ |
8a0662d9 RW |
295 | _proptype_, _val_, _nval_); \ |
296 | else \ | |
16ba08d5 RW |
297 | _ret_ = pset_prop_read_array(to_pset(_fwnode_), _propname_, \ |
298 | _proptype_, _val_, _nval_); \ | |
8a0662d9 RW |
299 | _ret_; \ |
300 | }) | |
301 | ||
302 | /** | |
303 | * fwnode_property_read_u8_array - return a u8 array property of firmware node | |
304 | * @fwnode: Firmware node to get the property of | |
305 | * @propname: Name of the property | |
5c0acf3b | 306 | * @val: The values are stored here or %NULL to return the number of values |
8a0662d9 RW |
307 | * @nval: Size of the @val array |
308 | * | |
309 | * Read an array of u8 properties with @propname from @fwnode and stores them to | |
310 | * @val if found. | |
311 | * | |
5c0acf3b AH |
312 | * Return: number of values if @val was %NULL, |
313 | * %0 if the property was found (success), | |
8a0662d9 RW |
314 | * %-EINVAL if given arguments are not valid, |
315 | * %-ENODATA if the property does not have a value, | |
316 | * %-EPROTO if the property is not an array of numbers, | |
317 | * %-EOVERFLOW if the size of the property is not as expected, | |
318 | * %-ENXIO if no suitable firmware interface is present. | |
319 | */ | |
320 | int fwnode_property_read_u8_array(struct fwnode_handle *fwnode, | |
321 | const char *propname, u8 *val, size_t nval) | |
322 | { | |
323 | return FWNODE_PROP_READ_ARRAY(fwnode, propname, u8, DEV_PROP_U8, | |
324 | val, nval); | |
325 | } | |
326 | EXPORT_SYMBOL_GPL(fwnode_property_read_u8_array); | |
327 | ||
328 | /** | |
329 | * fwnode_property_read_u16_array - return a u16 array property of firmware node | |
330 | * @fwnode: Firmware node to get the property of | |
331 | * @propname: Name of the property | |
5c0acf3b | 332 | * @val: The values are stored here or %NULL to return the number of values |
8a0662d9 RW |
333 | * @nval: Size of the @val array |
334 | * | |
335 | * Read an array of u16 properties with @propname from @fwnode and store them to | |
336 | * @val if found. | |
337 | * | |
5c0acf3b AH |
338 | * Return: number of values if @val was %NULL, |
339 | * %0 if the property was found (success), | |
8a0662d9 RW |
340 | * %-EINVAL if given arguments are not valid, |
341 | * %-ENODATA if the property does not have a value, | |
342 | * %-EPROTO if the property is not an array of numbers, | |
343 | * %-EOVERFLOW if the size of the property is not as expected, | |
344 | * %-ENXIO if no suitable firmware interface is present. | |
345 | */ | |
346 | int fwnode_property_read_u16_array(struct fwnode_handle *fwnode, | |
347 | const char *propname, u16 *val, size_t nval) | |
348 | { | |
349 | return FWNODE_PROP_READ_ARRAY(fwnode, propname, u16, DEV_PROP_U16, | |
350 | val, nval); | |
351 | } | |
352 | EXPORT_SYMBOL_GPL(fwnode_property_read_u16_array); | |
353 | ||
354 | /** | |
355 | * fwnode_property_read_u32_array - return a u32 array property of firmware node | |
356 | * @fwnode: Firmware node to get the property of | |
357 | * @propname: Name of the property | |
5c0acf3b | 358 | * @val: The values are stored here or %NULL to return the number of values |
8a0662d9 RW |
359 | * @nval: Size of the @val array |
360 | * | |
361 | * Read an array of u32 properties with @propname from @fwnode store them to | |
362 | * @val if found. | |
363 | * | |
5c0acf3b AH |
364 | * Return: number of values if @val was %NULL, |
365 | * %0 if the property was found (success), | |
8a0662d9 RW |
366 | * %-EINVAL if given arguments are not valid, |
367 | * %-ENODATA if the property does not have a value, | |
368 | * %-EPROTO if the property is not an array of numbers, | |
369 | * %-EOVERFLOW if the size of the property is not as expected, | |
370 | * %-ENXIO if no suitable firmware interface is present. | |
371 | */ | |
372 | int fwnode_property_read_u32_array(struct fwnode_handle *fwnode, | |
373 | const char *propname, u32 *val, size_t nval) | |
374 | { | |
375 | return FWNODE_PROP_READ_ARRAY(fwnode, propname, u32, DEV_PROP_U32, | |
376 | val, nval); | |
377 | } | |
378 | EXPORT_SYMBOL_GPL(fwnode_property_read_u32_array); | |
379 | ||
380 | /** | |
381 | * fwnode_property_read_u64_array - return a u64 array property firmware node | |
382 | * @fwnode: Firmware node to get the property of | |
383 | * @propname: Name of the property | |
5c0acf3b | 384 | * @val: The values are stored here or %NULL to return the number of values |
8a0662d9 RW |
385 | * @nval: Size of the @val array |
386 | * | |
387 | * Read an array of u64 properties with @propname from @fwnode and store them to | |
388 | * @val if found. | |
389 | * | |
5c0acf3b AH |
390 | * Return: number of values if @val was %NULL, |
391 | * %0 if the property was found (success), | |
8a0662d9 RW |
392 | * %-EINVAL if given arguments are not valid, |
393 | * %-ENODATA if the property does not have a value, | |
394 | * %-EPROTO if the property is not an array of numbers, | |
395 | * %-EOVERFLOW if the size of the property is not as expected, | |
396 | * %-ENXIO if no suitable firmware interface is present. | |
397 | */ | |
398 | int fwnode_property_read_u64_array(struct fwnode_handle *fwnode, | |
399 | const char *propname, u64 *val, size_t nval) | |
400 | { | |
401 | return FWNODE_PROP_READ_ARRAY(fwnode, propname, u64, DEV_PROP_U64, | |
402 | val, nval); | |
403 | } | |
404 | EXPORT_SYMBOL_GPL(fwnode_property_read_u64_array); | |
405 | ||
406 | /** | |
407 | * fwnode_property_read_string_array - return string array property of a node | |
408 | * @fwnode: Firmware node to get the property of | |
409 | * @propname: Name of the property | |
5c0acf3b | 410 | * @val: The values are stored here or %NULL to return the number of values |
8a0662d9 RW |
411 | * @nval: Size of the @val array |
412 | * | |
413 | * Read an string list property @propname from the given firmware node and store | |
414 | * them to @val if found. | |
415 | * | |
5c0acf3b AH |
416 | * Return: number of values if @val was %NULL, |
417 | * %0 if the property was found (success), | |
8a0662d9 RW |
418 | * %-EINVAL if given arguments are not valid, |
419 | * %-ENODATA if the property does not have a value, | |
420 | * %-EPROTO if the property is not an array of strings, | |
421 | * %-EOVERFLOW if the size of the property is not as expected, | |
422 | * %-ENXIO if no suitable firmware interface is present. | |
423 | */ | |
424 | int fwnode_property_read_string_array(struct fwnode_handle *fwnode, | |
425 | const char *propname, const char **val, | |
426 | size_t nval) | |
427 | { | |
428 | if (is_of_node(fwnode)) | |
f42712a9 | 429 | return val ? |
c181fb3e AS |
430 | of_property_read_string_array(to_of_node(fwnode), |
431 | propname, val, nval) : | |
432 | of_property_count_strings(to_of_node(fwnode), propname); | |
8a0662d9 | 433 | else if (is_acpi_node(fwnode)) |
c181fb3e | 434 | return acpi_dev_prop_read(to_acpi_node(fwnode), propname, |
8a0662d9 RW |
435 | DEV_PROP_STRING, val, nval); |
436 | ||
16ba08d5 RW |
437 | return pset_prop_read_array(to_pset(fwnode), propname, |
438 | DEV_PROP_STRING, val, nval); | |
8a0662d9 RW |
439 | } |
440 | EXPORT_SYMBOL_GPL(fwnode_property_read_string_array); | |
441 | ||
442 | /** | |
443 | * fwnode_property_read_string - return a string property of a firmware node | |
444 | * @fwnode: Firmware node to get the property of | |
445 | * @propname: Name of the property | |
446 | * @val: The value is stored here | |
447 | * | |
448 | * Read property @propname from the given firmware node and store the value into | |
449 | * @val if found. The value is checked to be a string. | |
450 | * | |
451 | * Return: %0 if the property was found (success), | |
452 | * %-EINVAL if given arguments are not valid, | |
453 | * %-ENODATA if the property does not have a value, | |
454 | * %-EPROTO or %-EILSEQ if the property is not a string, | |
455 | * %-ENXIO if no suitable firmware interface is present. | |
456 | */ | |
457 | int fwnode_property_read_string(struct fwnode_handle *fwnode, | |
458 | const char *propname, const char **val) | |
459 | { | |
460 | if (is_of_node(fwnode)) | |
c181fb3e | 461 | return of_property_read_string(to_of_node(fwnode), propname, val); |
8a0662d9 | 462 | else if (is_acpi_node(fwnode)) |
c181fb3e | 463 | return acpi_dev_prop_read(to_acpi_node(fwnode), propname, |
8a0662d9 RW |
464 | DEV_PROP_STRING, val, 1); |
465 | ||
466 | return -ENXIO; | |
467 | } | |
468 | EXPORT_SYMBOL_GPL(fwnode_property_read_string); | |
469 | ||
470 | /** | |
471 | * device_get_next_child_node - Return the next child node handle for a device | |
472 | * @dev: Device to find the next child node for. | |
473 | * @child: Handle to one of the device's child nodes or a null handle. | |
474 | */ | |
475 | struct fwnode_handle *device_get_next_child_node(struct device *dev, | |
476 | struct fwnode_handle *child) | |
477 | { | |
478 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) { | |
479 | struct device_node *node; | |
480 | ||
c181fb3e | 481 | node = of_get_next_available_child(dev->of_node, to_of_node(child)); |
8a0662d9 RW |
482 | if (node) |
483 | return &node->fwnode; | |
484 | } else if (IS_ENABLED(CONFIG_ACPI)) { | |
485 | struct acpi_device *node; | |
486 | ||
c181fb3e | 487 | node = acpi_get_next_child(dev, to_acpi_node(child)); |
8a0662d9 RW |
488 | if (node) |
489 | return acpi_fwnode_handle(node); | |
490 | } | |
491 | return NULL; | |
492 | } | |
493 | EXPORT_SYMBOL_GPL(device_get_next_child_node); | |
494 | ||
495 | /** | |
496 | * fwnode_handle_put - Drop reference to a device node | |
497 | * @fwnode: Pointer to the device node to drop the reference to. | |
498 | * | |
499 | * This has to be used when terminating device_for_each_child_node() iteration | |
500 | * with break or return to prevent stale device node references from being left | |
501 | * behind. | |
502 | */ | |
503 | void fwnode_handle_put(struct fwnode_handle *fwnode) | |
504 | { | |
505 | if (is_of_node(fwnode)) | |
c181fb3e | 506 | of_node_put(to_of_node(fwnode)); |
8a0662d9 RW |
507 | } |
508 | EXPORT_SYMBOL_GPL(fwnode_handle_put); | |
509 | ||
510 | /** | |
511 | * device_get_child_node_count - return the number of child nodes for device | |
512 | * @dev: Device to cound the child nodes for | |
513 | */ | |
514 | unsigned int device_get_child_node_count(struct device *dev) | |
515 | { | |
516 | struct fwnode_handle *child; | |
517 | unsigned int count = 0; | |
518 | ||
519 | device_for_each_child_node(dev, child) | |
520 | count++; | |
521 | ||
522 | return count; | |
523 | } | |
524 | EXPORT_SYMBOL_GPL(device_get_child_node_count); | |
05ca5560 SS |
525 | |
526 | bool device_dma_is_coherent(struct device *dev) | |
527 | { | |
528 | bool coherent = false; | |
529 | ||
530 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) | |
531 | coherent = of_dma_is_coherent(dev->of_node); | |
532 | else | |
533 | acpi_check_dma(ACPI_COMPANION(dev), &coherent); | |
534 | ||
535 | return coherent; | |
536 | } | |
537 | EXPORT_SYMBOL_GPL(device_dma_is_coherent); | |
4c96b7dc JL |
538 | |
539 | /** | |
2f710a3a | 540 | * device_get_phy_mode - Get phy mode for given device |
4c96b7dc JL |
541 | * @dev: Pointer to the given device |
542 | * | |
543 | * The function gets phy interface string from property 'phy-mode' or | |
544 | * 'phy-connection-type', and return its index in phy_modes table, or errno in | |
545 | * error case. | |
546 | */ | |
547 | int device_get_phy_mode(struct device *dev) | |
548 | { | |
549 | const char *pm; | |
550 | int err, i; | |
551 | ||
552 | err = device_property_read_string(dev, "phy-mode", &pm); | |
553 | if (err < 0) | |
554 | err = device_property_read_string(dev, | |
555 | "phy-connection-type", &pm); | |
556 | if (err < 0) | |
557 | return err; | |
558 | ||
559 | for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++) | |
560 | if (!strcasecmp(pm, phy_modes(i))) | |
561 | return i; | |
562 | ||
563 | return -ENODEV; | |
564 | } | |
565 | EXPORT_SYMBOL_GPL(device_get_phy_mode); | |
566 | ||
567 | static void *device_get_mac_addr(struct device *dev, | |
568 | const char *name, char *addr, | |
569 | int alen) | |
570 | { | |
571 | int ret = device_property_read_u8_array(dev, name, addr, alen); | |
572 | ||
2f710a3a | 573 | if (ret == 0 && alen == ETH_ALEN && is_valid_ether_addr(addr)) |
4c96b7dc JL |
574 | return addr; |
575 | return NULL; | |
576 | } | |
577 | ||
578 | /** | |
2f710a3a JL |
579 | * device_get_mac_address - Get the MAC for a given device |
580 | * @dev: Pointer to the device | |
581 | * @addr: Address of buffer to store the MAC in | |
582 | * @alen: Length of the buffer pointed to by addr, should be ETH_ALEN | |
583 | * | |
584 | * Search the firmware node for the best MAC address to use. 'mac-address' is | |
4c96b7dc JL |
585 | * checked first, because that is supposed to contain to "most recent" MAC |
586 | * address. If that isn't set, then 'local-mac-address' is checked next, | |
587 | * because that is the default address. If that isn't set, then the obsolete | |
588 | * 'address' is checked, just in case we're using an old device tree. | |
589 | * | |
590 | * Note that the 'address' property is supposed to contain a virtual address of | |
591 | * the register set, but some DTS files have redefined that property to be the | |
592 | * MAC address. | |
593 | * | |
594 | * All-zero MAC addresses are rejected, because those could be properties that | |
2f710a3a JL |
595 | * exist in the firmware tables, but were not updated by the firmware. For |
596 | * example, the DTS could define 'mac-address' and 'local-mac-address', with | |
597 | * zero MAC addresses. Some older U-Boots only initialized 'local-mac-address'. | |
598 | * In this case, the real MAC is in 'local-mac-address', and 'mac-address' | |
599 | * exists but is all zeros. | |
4c96b7dc JL |
600 | */ |
601 | void *device_get_mac_address(struct device *dev, char *addr, int alen) | |
602 | { | |
603 | addr = device_get_mac_addr(dev, "mac-address", addr, alen); | |
604 | if (addr) | |
605 | return addr; | |
606 | ||
607 | addr = device_get_mac_addr(dev, "local-mac-address", addr, alen); | |
608 | if (addr) | |
609 | return addr; | |
610 | ||
611 | return device_get_mac_addr(dev, "address", addr, alen); | |
612 | } | |
613 | EXPORT_SYMBOL(device_get_mac_address); |