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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 | { | |
ecc87eed AS |
32 | if (!pset) |
33 | return; | |
16ba08d5 | 34 | |
ecc87eed | 35 | pset->fwnode.type = FWNODE_PDATA; |
16ba08d5 RW |
36 | set_secondary_fwnode(dev, &pset->fwnode); |
37 | } | |
38 | EXPORT_SYMBOL_GPL(device_add_property_set); | |
39 | ||
40 | static inline bool is_pset(struct fwnode_handle *fwnode) | |
41 | { | |
42 | return fwnode && fwnode->type == FWNODE_PDATA; | |
43 | } | |
44 | ||
45 | static inline struct property_set *to_pset(struct fwnode_handle *fwnode) | |
46 | { | |
47 | return is_pset(fwnode) ? | |
48 | container_of(fwnode, struct property_set, fwnode) : NULL; | |
49 | } | |
50 | ||
51 | static struct property_entry *pset_prop_get(struct property_set *pset, | |
52 | const char *name) | |
53 | { | |
54 | struct property_entry *prop; | |
55 | ||
56 | if (!pset || !pset->properties) | |
57 | return NULL; | |
58 | ||
59 | for (prop = pset->properties; prop->name; prop++) | |
60 | if (!strcmp(name, prop->name)) | |
61 | return prop; | |
62 | ||
63 | return NULL; | |
64 | } | |
65 | ||
66 | static int pset_prop_read_array(struct property_set *pset, const char *name, | |
67 | enum dev_prop_type type, void *val, size_t nval) | |
68 | { | |
69 | struct property_entry *prop; | |
70 | unsigned int item_size; | |
71 | ||
72 | prop = pset_prop_get(pset, name); | |
73 | if (!prop) | |
74 | return -ENODATA; | |
75 | ||
76 | if (prop->type != type) | |
77 | return -EPROTO; | |
78 | ||
79 | if (!val) | |
80 | return prop->nval; | |
81 | ||
82 | if (prop->nval < nval) | |
83 | return -EOVERFLOW; | |
84 | ||
85 | switch (type) { | |
86 | case DEV_PROP_U8: | |
87 | item_size = sizeof(u8); | |
88 | break; | |
89 | case DEV_PROP_U16: | |
90 | item_size = sizeof(u16); | |
91 | break; | |
92 | case DEV_PROP_U32: | |
93 | item_size = sizeof(u32); | |
94 | break; | |
95 | case DEV_PROP_U64: | |
96 | item_size = sizeof(u64); | |
97 | break; | |
98 | case DEV_PROP_STRING: | |
99 | item_size = sizeof(const char *); | |
100 | break; | |
101 | default: | |
102 | return -EINVAL; | |
103 | } | |
104 | memcpy(val, prop->value.raw_data, nval * item_size); | |
105 | return 0; | |
106 | } | |
b31384fa | 107 | |
9017f252 RW |
108 | static inline struct fwnode_handle *dev_fwnode(struct device *dev) |
109 | { | |
110 | return IS_ENABLED(CONFIG_OF) && dev->of_node ? | |
111 | &dev->of_node->fwnode : dev->fwnode; | |
112 | } | |
b31384fa RW |
113 | |
114 | /** | |
115 | * device_property_present - check if a property of a device is present | |
116 | * @dev: Device whose property is being checked | |
117 | * @propname: Name of the property | |
118 | * | |
119 | * Check if property @propname is present in the device firmware description. | |
120 | */ | |
121 | bool device_property_present(struct device *dev, const char *propname) | |
122 | { | |
9017f252 | 123 | return fwnode_property_present(dev_fwnode(dev), propname); |
b31384fa RW |
124 | } |
125 | EXPORT_SYMBOL_GPL(device_property_present); | |
126 | ||
8a0662d9 RW |
127 | /** |
128 | * fwnode_property_present - check if a property of a firmware node is present | |
129 | * @fwnode: Firmware node whose property to check | |
130 | * @propname: Name of the property | |
131 | */ | |
132 | bool fwnode_property_present(struct fwnode_handle *fwnode, const char *propname) | |
133 | { | |
134 | if (is_of_node(fwnode)) | |
c181fb3e | 135 | return of_property_read_bool(to_of_node(fwnode), propname); |
8a0662d9 | 136 | else if (is_acpi_node(fwnode)) |
3a7a2ab8 | 137 | return !acpi_node_prop_get(fwnode, propname, NULL); |
8a0662d9 | 138 | |
16ba08d5 | 139 | return !!pset_prop_get(to_pset(fwnode), propname); |
8a0662d9 RW |
140 | } |
141 | EXPORT_SYMBOL_GPL(fwnode_property_present); | |
142 | ||
b31384fa RW |
143 | /** |
144 | * device_property_read_u8_array - return a u8 array property of a device | |
145 | * @dev: Device to get the property of | |
146 | * @propname: Name of the property | |
5c0acf3b | 147 | * @val: The values are stored here or %NULL to return the number of values |
b31384fa RW |
148 | * @nval: Size of the @val array |
149 | * | |
150 | * Function reads an array of u8 properties with @propname from the device | |
151 | * firmware description and stores them to @val if found. | |
152 | * | |
5c0acf3b AH |
153 | * Return: number of values if @val was %NULL, |
154 | * %0 if the property was found (success), | |
b31384fa RW |
155 | * %-EINVAL if given arguments are not valid, |
156 | * %-ENODATA if the property does not have a value, | |
157 | * %-EPROTO if the property is not an array of numbers, | |
158 | * %-EOVERFLOW if the size of the property is not as expected. | |
4fa7508e | 159 | * %-ENXIO if no suitable firmware interface is present. |
b31384fa RW |
160 | */ |
161 | int device_property_read_u8_array(struct device *dev, const char *propname, | |
162 | u8 *val, size_t nval) | |
163 | { | |
9017f252 | 164 | return fwnode_property_read_u8_array(dev_fwnode(dev), propname, val, nval); |
b31384fa RW |
165 | } |
166 | EXPORT_SYMBOL_GPL(device_property_read_u8_array); | |
167 | ||
168 | /** | |
169 | * device_property_read_u16_array - return a u16 array property of a device | |
170 | * @dev: Device to get the property of | |
171 | * @propname: Name of the property | |
5c0acf3b | 172 | * @val: The values are stored here or %NULL to return the number of values |
b31384fa RW |
173 | * @nval: Size of the @val array |
174 | * | |
175 | * Function reads an array of u16 properties with @propname from the device | |
176 | * firmware description and stores them to @val if found. | |
177 | * | |
5c0acf3b AH |
178 | * Return: number of values if @val was %NULL, |
179 | * %0 if the property was found (success), | |
b31384fa RW |
180 | * %-EINVAL if given arguments are not valid, |
181 | * %-ENODATA if the property does not have a value, | |
182 | * %-EPROTO if the property is not an array of numbers, | |
183 | * %-EOVERFLOW if the size of the property is not as expected. | |
4fa7508e | 184 | * %-ENXIO if no suitable firmware interface is present. |
b31384fa RW |
185 | */ |
186 | int device_property_read_u16_array(struct device *dev, const char *propname, | |
187 | u16 *val, size_t nval) | |
188 | { | |
9017f252 | 189 | return fwnode_property_read_u16_array(dev_fwnode(dev), propname, val, nval); |
b31384fa RW |
190 | } |
191 | EXPORT_SYMBOL_GPL(device_property_read_u16_array); | |
192 | ||
193 | /** | |
194 | * device_property_read_u32_array - return a u32 array property of a device | |
195 | * @dev: Device to get the property of | |
196 | * @propname: Name of the property | |
5c0acf3b | 197 | * @val: The values are stored here or %NULL to return the number of values |
b31384fa RW |
198 | * @nval: Size of the @val array |
199 | * | |
200 | * Function reads an array of u32 properties with @propname from the device | |
201 | * firmware description and stores them to @val if found. | |
202 | * | |
5c0acf3b AH |
203 | * Return: number of values if @val was %NULL, |
204 | * %0 if the property was found (success), | |
b31384fa RW |
205 | * %-EINVAL if given arguments are not valid, |
206 | * %-ENODATA if the property does not have a value, | |
207 | * %-EPROTO if the property is not an array of numbers, | |
208 | * %-EOVERFLOW if the size of the property is not as expected. | |
4fa7508e | 209 | * %-ENXIO if no suitable firmware interface is present. |
b31384fa RW |
210 | */ |
211 | int device_property_read_u32_array(struct device *dev, const char *propname, | |
212 | u32 *val, size_t nval) | |
213 | { | |
9017f252 | 214 | return fwnode_property_read_u32_array(dev_fwnode(dev), propname, val, nval); |
b31384fa RW |
215 | } |
216 | EXPORT_SYMBOL_GPL(device_property_read_u32_array); | |
217 | ||
218 | /** | |
219 | * device_property_read_u64_array - return a u64 array property of a device | |
220 | * @dev: Device to get the property of | |
221 | * @propname: Name of the property | |
5c0acf3b | 222 | * @val: The values are stored here or %NULL to return the number of values |
b31384fa RW |
223 | * @nval: Size of the @val array |
224 | * | |
225 | * Function reads an array of u64 properties with @propname from the device | |
226 | * firmware description and stores them to @val if found. | |
227 | * | |
5c0acf3b AH |
228 | * Return: number of values if @val was %NULL, |
229 | * %0 if the property was found (success), | |
b31384fa RW |
230 | * %-EINVAL if given arguments are not valid, |
231 | * %-ENODATA if the property does not have a value, | |
232 | * %-EPROTO if the property is not an array of numbers, | |
233 | * %-EOVERFLOW if the size of the property is not as expected. | |
4fa7508e | 234 | * %-ENXIO if no suitable firmware interface is present. |
b31384fa RW |
235 | */ |
236 | int device_property_read_u64_array(struct device *dev, const char *propname, | |
237 | u64 *val, size_t nval) | |
238 | { | |
9017f252 | 239 | return fwnode_property_read_u64_array(dev_fwnode(dev), propname, val, nval); |
b31384fa RW |
240 | } |
241 | EXPORT_SYMBOL_GPL(device_property_read_u64_array); | |
242 | ||
243 | /** | |
244 | * device_property_read_string_array - return a string array property of device | |
245 | * @dev: Device to get the property of | |
246 | * @propname: Name of the property | |
5c0acf3b | 247 | * @val: The values are stored here or %NULL to return the number of values |
b31384fa RW |
248 | * @nval: Size of the @val array |
249 | * | |
250 | * Function reads an array of string properties with @propname from the device | |
251 | * firmware description and stores them to @val if found. | |
252 | * | |
5c0acf3b AH |
253 | * Return: number of values if @val was %NULL, |
254 | * %0 if the property was found (success), | |
b31384fa RW |
255 | * %-EINVAL if given arguments are not valid, |
256 | * %-ENODATA if the property does not have a value, | |
257 | * %-EPROTO or %-EILSEQ if the property is not an array of strings, | |
258 | * %-EOVERFLOW if the size of the property is not as expected. | |
4fa7508e | 259 | * %-ENXIO if no suitable firmware interface is present. |
b31384fa RW |
260 | */ |
261 | int device_property_read_string_array(struct device *dev, const char *propname, | |
262 | const char **val, size_t nval) | |
263 | { | |
9017f252 | 264 | return fwnode_property_read_string_array(dev_fwnode(dev), propname, val, nval); |
b31384fa RW |
265 | } |
266 | EXPORT_SYMBOL_GPL(device_property_read_string_array); | |
267 | ||
268 | /** | |
269 | * device_property_read_string - return a string property of a device | |
270 | * @dev: Device to get the property of | |
271 | * @propname: Name of the property | |
272 | * @val: The value is stored here | |
273 | * | |
274 | * Function reads property @propname from the device firmware description and | |
275 | * stores the value into @val if found. The value is checked to be a string. | |
276 | * | |
277 | * Return: %0 if the property was found (success), | |
278 | * %-EINVAL if given arguments are not valid, | |
279 | * %-ENODATA if the property does not have a value, | |
280 | * %-EPROTO or %-EILSEQ if the property type is not a string. | |
4fa7508e | 281 | * %-ENXIO if no suitable firmware interface is present. |
b31384fa RW |
282 | */ |
283 | int device_property_read_string(struct device *dev, const char *propname, | |
284 | const char **val) | |
285 | { | |
9017f252 | 286 | return fwnode_property_read_string(dev_fwnode(dev), propname, val); |
b31384fa RW |
287 | } |
288 | EXPORT_SYMBOL_GPL(device_property_read_string); | |
8a0662d9 | 289 | |
3f5c8d31 MW |
290 | /** |
291 | * device_property_match_string - find a string in an array and return index | |
292 | * @dev: Device to get the property of | |
293 | * @propname: Name of the property holding the array | |
294 | * @string: String to look for | |
295 | * | |
296 | * Find a given string in a string array and if it is found return the | |
297 | * index back. | |
298 | * | |
299 | * Return: %0 if the property was found (success), | |
300 | * %-EINVAL if given arguments are not valid, | |
301 | * %-ENODATA if the property does not have a value, | |
302 | * %-EPROTO if the property is not an array of strings, | |
303 | * %-ENXIO if no suitable firmware interface is present. | |
304 | */ | |
305 | int device_property_match_string(struct device *dev, const char *propname, | |
306 | const char *string) | |
307 | { | |
308 | return fwnode_property_match_string(dev_fwnode(dev), propname, string); | |
309 | } | |
310 | EXPORT_SYMBOL_GPL(device_property_match_string); | |
311 | ||
9017f252 RW |
312 | #define OF_DEV_PROP_READ_ARRAY(node, propname, type, val, nval) \ |
313 | (val) ? of_property_read_##type##_array((node), (propname), (val), (nval)) \ | |
314 | : of_property_count_elems_of_size((node), (propname), sizeof(type)) | |
315 | ||
8a0662d9 RW |
316 | #define FWNODE_PROP_READ_ARRAY(_fwnode_, _propname_, _type_, _proptype_, _val_, _nval_) \ |
317 | ({ \ | |
318 | int _ret_; \ | |
319 | if (is_of_node(_fwnode_)) \ | |
c181fb3e | 320 | _ret_ = OF_DEV_PROP_READ_ARRAY(to_of_node(_fwnode_), _propname_, \ |
8a0662d9 RW |
321 | _type_, _val_, _nval_); \ |
322 | else if (is_acpi_node(_fwnode_)) \ | |
3a7a2ab8 RW |
323 | _ret_ = acpi_node_prop_read(_fwnode_, _propname_, _proptype_, \ |
324 | _val_, _nval_); \ | |
4fa7508e | 325 | else if (is_pset(_fwnode_)) \ |
16ba08d5 RW |
326 | _ret_ = pset_prop_read_array(to_pset(_fwnode_), _propname_, \ |
327 | _proptype_, _val_, _nval_); \ | |
4fa7508e GR |
328 | else \ |
329 | _ret_ = -ENXIO; \ | |
8a0662d9 RW |
330 | _ret_; \ |
331 | }) | |
332 | ||
333 | /** | |
334 | * fwnode_property_read_u8_array - return a u8 array property of firmware node | |
335 | * @fwnode: Firmware node to get the property of | |
336 | * @propname: Name of the property | |
5c0acf3b | 337 | * @val: The values are stored here or %NULL to return the number of values |
8a0662d9 RW |
338 | * @nval: Size of the @val array |
339 | * | |
340 | * Read an array of u8 properties with @propname from @fwnode and stores them to | |
341 | * @val if found. | |
342 | * | |
5c0acf3b AH |
343 | * Return: number of values if @val was %NULL, |
344 | * %0 if the property was found (success), | |
8a0662d9 RW |
345 | * %-EINVAL if given arguments are not valid, |
346 | * %-ENODATA if the property does not have a value, | |
347 | * %-EPROTO if the property is not an array of numbers, | |
348 | * %-EOVERFLOW if the size of the property is not as expected, | |
349 | * %-ENXIO if no suitable firmware interface is present. | |
350 | */ | |
351 | int fwnode_property_read_u8_array(struct fwnode_handle *fwnode, | |
352 | const char *propname, u8 *val, size_t nval) | |
353 | { | |
354 | return FWNODE_PROP_READ_ARRAY(fwnode, propname, u8, DEV_PROP_U8, | |
355 | val, nval); | |
356 | } | |
357 | EXPORT_SYMBOL_GPL(fwnode_property_read_u8_array); | |
358 | ||
359 | /** | |
360 | * fwnode_property_read_u16_array - return a u16 array property of firmware node | |
361 | * @fwnode: Firmware node to get the property of | |
362 | * @propname: Name of the property | |
5c0acf3b | 363 | * @val: The values are stored here or %NULL to return the number of values |
8a0662d9 RW |
364 | * @nval: Size of the @val array |
365 | * | |
366 | * Read an array of u16 properties with @propname from @fwnode and store them to | |
367 | * @val if found. | |
368 | * | |
5c0acf3b AH |
369 | * Return: number of values if @val was %NULL, |
370 | * %0 if the property was found (success), | |
8a0662d9 RW |
371 | * %-EINVAL if given arguments are not valid, |
372 | * %-ENODATA if the property does not have a value, | |
373 | * %-EPROTO if the property is not an array of numbers, | |
374 | * %-EOVERFLOW if the size of the property is not as expected, | |
375 | * %-ENXIO if no suitable firmware interface is present. | |
376 | */ | |
377 | int fwnode_property_read_u16_array(struct fwnode_handle *fwnode, | |
378 | const char *propname, u16 *val, size_t nval) | |
379 | { | |
380 | return FWNODE_PROP_READ_ARRAY(fwnode, propname, u16, DEV_PROP_U16, | |
381 | val, nval); | |
382 | } | |
383 | EXPORT_SYMBOL_GPL(fwnode_property_read_u16_array); | |
384 | ||
385 | /** | |
386 | * fwnode_property_read_u32_array - return a u32 array property of firmware node | |
387 | * @fwnode: Firmware node to get the property of | |
388 | * @propname: Name of the property | |
5c0acf3b | 389 | * @val: The values are stored here or %NULL to return the number of values |
8a0662d9 RW |
390 | * @nval: Size of the @val array |
391 | * | |
392 | * Read an array of u32 properties with @propname from @fwnode store them to | |
393 | * @val if found. | |
394 | * | |
5c0acf3b AH |
395 | * Return: number of values if @val was %NULL, |
396 | * %0 if the property was found (success), | |
8a0662d9 RW |
397 | * %-EINVAL if given arguments are not valid, |
398 | * %-ENODATA if the property does not have a value, | |
399 | * %-EPROTO if the property is not an array of numbers, | |
400 | * %-EOVERFLOW if the size of the property is not as expected, | |
401 | * %-ENXIO if no suitable firmware interface is present. | |
402 | */ | |
403 | int fwnode_property_read_u32_array(struct fwnode_handle *fwnode, | |
404 | const char *propname, u32 *val, size_t nval) | |
405 | { | |
406 | return FWNODE_PROP_READ_ARRAY(fwnode, propname, u32, DEV_PROP_U32, | |
407 | val, nval); | |
408 | } | |
409 | EXPORT_SYMBOL_GPL(fwnode_property_read_u32_array); | |
410 | ||
411 | /** | |
412 | * fwnode_property_read_u64_array - return a u64 array property firmware node | |
413 | * @fwnode: Firmware node to get the property of | |
414 | * @propname: Name of the property | |
5c0acf3b | 415 | * @val: The values are stored here or %NULL to return the number of values |
8a0662d9 RW |
416 | * @nval: Size of the @val array |
417 | * | |
418 | * Read an array of u64 properties with @propname from @fwnode and store them to | |
419 | * @val if found. | |
420 | * | |
5c0acf3b AH |
421 | * Return: number of values if @val was %NULL, |
422 | * %0 if the property was found (success), | |
8a0662d9 RW |
423 | * %-EINVAL if given arguments are not valid, |
424 | * %-ENODATA if the property does not have a value, | |
425 | * %-EPROTO if the property is not an array of numbers, | |
426 | * %-EOVERFLOW if the size of the property is not as expected, | |
427 | * %-ENXIO if no suitable firmware interface is present. | |
428 | */ | |
429 | int fwnode_property_read_u64_array(struct fwnode_handle *fwnode, | |
430 | const char *propname, u64 *val, size_t nval) | |
431 | { | |
432 | return FWNODE_PROP_READ_ARRAY(fwnode, propname, u64, DEV_PROP_U64, | |
433 | val, nval); | |
434 | } | |
435 | EXPORT_SYMBOL_GPL(fwnode_property_read_u64_array); | |
436 | ||
437 | /** | |
438 | * fwnode_property_read_string_array - return string array property of a node | |
439 | * @fwnode: Firmware node to get the property of | |
440 | * @propname: Name of the property | |
5c0acf3b | 441 | * @val: The values are stored here or %NULL to return the number of values |
8a0662d9 RW |
442 | * @nval: Size of the @val array |
443 | * | |
444 | * Read an string list property @propname from the given firmware node and store | |
445 | * them to @val if found. | |
446 | * | |
5c0acf3b AH |
447 | * Return: number of values if @val was %NULL, |
448 | * %0 if the property was found (success), | |
8a0662d9 RW |
449 | * %-EINVAL if given arguments are not valid, |
450 | * %-ENODATA if the property does not have a value, | |
451 | * %-EPROTO if the property is not an array of strings, | |
452 | * %-EOVERFLOW if the size of the property is not as expected, | |
453 | * %-ENXIO if no suitable firmware interface is present. | |
454 | */ | |
455 | int fwnode_property_read_string_array(struct fwnode_handle *fwnode, | |
456 | const char *propname, const char **val, | |
457 | size_t nval) | |
458 | { | |
459 | if (is_of_node(fwnode)) | |
f42712a9 | 460 | return val ? |
c181fb3e AS |
461 | of_property_read_string_array(to_of_node(fwnode), |
462 | propname, val, nval) : | |
463 | of_property_count_strings(to_of_node(fwnode), propname); | |
8a0662d9 | 464 | else if (is_acpi_node(fwnode)) |
3a7a2ab8 RW |
465 | return acpi_node_prop_read(fwnode, propname, DEV_PROP_STRING, |
466 | val, nval); | |
4fa7508e GR |
467 | else if (is_pset(fwnode)) |
468 | return pset_prop_read_array(to_pset(fwnode), propname, | |
469 | DEV_PROP_STRING, val, nval); | |
470 | return -ENXIO; | |
8a0662d9 RW |
471 | } |
472 | EXPORT_SYMBOL_GPL(fwnode_property_read_string_array); | |
473 | ||
474 | /** | |
475 | * fwnode_property_read_string - return a string property of a firmware node | |
476 | * @fwnode: Firmware node to get the property of | |
477 | * @propname: Name of the property | |
478 | * @val: The value is stored here | |
479 | * | |
480 | * Read property @propname from the given firmware node and store the value into | |
481 | * @val if found. The value is checked to be a string. | |
482 | * | |
483 | * Return: %0 if the property was found (success), | |
484 | * %-EINVAL if given arguments are not valid, | |
485 | * %-ENODATA if the property does not have a value, | |
486 | * %-EPROTO or %-EILSEQ if the property is not a string, | |
487 | * %-ENXIO if no suitable firmware interface is present. | |
488 | */ | |
489 | int fwnode_property_read_string(struct fwnode_handle *fwnode, | |
490 | const char *propname, const char **val) | |
491 | { | |
492 | if (is_of_node(fwnode)) | |
c181fb3e | 493 | return of_property_read_string(to_of_node(fwnode), propname, val); |
8a0662d9 | 494 | else if (is_acpi_node(fwnode)) |
3a7a2ab8 RW |
495 | return acpi_node_prop_read(fwnode, propname, DEV_PROP_STRING, |
496 | val, 1); | |
8a0662d9 | 497 | |
4f73b065 AS |
498 | return pset_prop_read_array(to_pset(fwnode), propname, |
499 | DEV_PROP_STRING, val, 1); | |
8a0662d9 RW |
500 | } |
501 | EXPORT_SYMBOL_GPL(fwnode_property_read_string); | |
502 | ||
3f5c8d31 MW |
503 | /** |
504 | * fwnode_property_match_string - find a string in an array and return index | |
505 | * @fwnode: Firmware node to get the property of | |
506 | * @propname: Name of the property holding the array | |
507 | * @string: String to look for | |
508 | * | |
509 | * Find a given string in a string array and if it is found return the | |
510 | * index back. | |
511 | * | |
512 | * Return: %0 if the property was found (success), | |
513 | * %-EINVAL if given arguments are not valid, | |
514 | * %-ENODATA if the property does not have a value, | |
515 | * %-EPROTO if the property is not an array of strings, | |
516 | * %-ENXIO if no suitable firmware interface is present. | |
517 | */ | |
518 | int fwnode_property_match_string(struct fwnode_handle *fwnode, | |
519 | const char *propname, const char *string) | |
520 | { | |
521 | const char **values; | |
522 | int nval, ret, i; | |
523 | ||
524 | nval = fwnode_property_read_string_array(fwnode, propname, NULL, 0); | |
525 | if (nval < 0) | |
526 | return nval; | |
527 | ||
528 | values = kcalloc(nval, sizeof(*values), GFP_KERNEL); | |
529 | if (!values) | |
530 | return -ENOMEM; | |
531 | ||
532 | ret = fwnode_property_read_string_array(fwnode, propname, values, nval); | |
533 | if (ret < 0) | |
534 | goto out; | |
535 | ||
536 | ret = -ENODATA; | |
537 | for (i = 0; i < nval; i++) { | |
538 | if (!strcmp(values[i], string)) { | |
539 | ret = i; | |
540 | break; | |
541 | } | |
542 | } | |
543 | out: | |
544 | kfree(values); | |
545 | return ret; | |
546 | } | |
547 | EXPORT_SYMBOL_GPL(fwnode_property_match_string); | |
548 | ||
8a0662d9 RW |
549 | /** |
550 | * device_get_next_child_node - Return the next child node handle for a device | |
551 | * @dev: Device to find the next child node for. | |
552 | * @child: Handle to one of the device's child nodes or a null handle. | |
553 | */ | |
554 | struct fwnode_handle *device_get_next_child_node(struct device *dev, | |
555 | struct fwnode_handle *child) | |
556 | { | |
557 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) { | |
558 | struct device_node *node; | |
559 | ||
c181fb3e | 560 | node = of_get_next_available_child(dev->of_node, to_of_node(child)); |
8a0662d9 RW |
561 | if (node) |
562 | return &node->fwnode; | |
563 | } else if (IS_ENABLED(CONFIG_ACPI)) { | |
504a3374 | 564 | return acpi_get_next_subnode(dev, child); |
8a0662d9 RW |
565 | } |
566 | return NULL; | |
567 | } | |
568 | EXPORT_SYMBOL_GPL(device_get_next_child_node); | |
569 | ||
570 | /** | |
571 | * fwnode_handle_put - Drop reference to a device node | |
572 | * @fwnode: Pointer to the device node to drop the reference to. | |
573 | * | |
574 | * This has to be used when terminating device_for_each_child_node() iteration | |
575 | * with break or return to prevent stale device node references from being left | |
576 | * behind. | |
577 | */ | |
578 | void fwnode_handle_put(struct fwnode_handle *fwnode) | |
579 | { | |
580 | if (is_of_node(fwnode)) | |
c181fb3e | 581 | of_node_put(to_of_node(fwnode)); |
8a0662d9 RW |
582 | } |
583 | EXPORT_SYMBOL_GPL(fwnode_handle_put); | |
584 | ||
585 | /** | |
586 | * device_get_child_node_count - return the number of child nodes for device | |
587 | * @dev: Device to cound the child nodes for | |
588 | */ | |
589 | unsigned int device_get_child_node_count(struct device *dev) | |
590 | { | |
591 | struct fwnode_handle *child; | |
592 | unsigned int count = 0; | |
593 | ||
594 | device_for_each_child_node(dev, child) | |
595 | count++; | |
596 | ||
597 | return count; | |
598 | } | |
599 | EXPORT_SYMBOL_GPL(device_get_child_node_count); | |
05ca5560 | 600 | |
e5e55864 SS |
601 | bool device_dma_supported(struct device *dev) |
602 | { | |
603 | /* For DT, this is always supported. | |
604 | * For ACPI, this depends on CCA, which | |
605 | * is determined by the acpi_dma_supported(). | |
606 | */ | |
607 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) | |
608 | return true; | |
609 | ||
610 | return acpi_dma_supported(ACPI_COMPANION(dev)); | |
611 | } | |
612 | EXPORT_SYMBOL_GPL(device_dma_supported); | |
613 | ||
614 | enum dev_dma_attr device_get_dma_attr(struct device *dev) | |
615 | { | |
616 | enum dev_dma_attr attr = DEV_DMA_NOT_SUPPORTED; | |
617 | ||
618 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) { | |
619 | if (of_dma_is_coherent(dev->of_node)) | |
620 | attr = DEV_DMA_COHERENT; | |
621 | else | |
622 | attr = DEV_DMA_NON_COHERENT; | |
623 | } else | |
624 | attr = acpi_get_dma_attr(ACPI_COMPANION(dev)); | |
625 | ||
626 | return attr; | |
627 | } | |
628 | EXPORT_SYMBOL_GPL(device_get_dma_attr); | |
629 | ||
4c96b7dc | 630 | /** |
2f710a3a | 631 | * device_get_phy_mode - Get phy mode for given device |
4c96b7dc JL |
632 | * @dev: Pointer to the given device |
633 | * | |
634 | * The function gets phy interface string from property 'phy-mode' or | |
635 | * 'phy-connection-type', and return its index in phy_modes table, or errno in | |
636 | * error case. | |
637 | */ | |
638 | int device_get_phy_mode(struct device *dev) | |
639 | { | |
640 | const char *pm; | |
641 | int err, i; | |
642 | ||
643 | err = device_property_read_string(dev, "phy-mode", &pm); | |
644 | if (err < 0) | |
645 | err = device_property_read_string(dev, | |
646 | "phy-connection-type", &pm); | |
647 | if (err < 0) | |
648 | return err; | |
649 | ||
650 | for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++) | |
651 | if (!strcasecmp(pm, phy_modes(i))) | |
652 | return i; | |
653 | ||
654 | return -ENODEV; | |
655 | } | |
656 | EXPORT_SYMBOL_GPL(device_get_phy_mode); | |
657 | ||
658 | static void *device_get_mac_addr(struct device *dev, | |
659 | const char *name, char *addr, | |
660 | int alen) | |
661 | { | |
662 | int ret = device_property_read_u8_array(dev, name, addr, alen); | |
663 | ||
2f710a3a | 664 | if (ret == 0 && alen == ETH_ALEN && is_valid_ether_addr(addr)) |
4c96b7dc JL |
665 | return addr; |
666 | return NULL; | |
667 | } | |
668 | ||
669 | /** | |
2f710a3a JL |
670 | * device_get_mac_address - Get the MAC for a given device |
671 | * @dev: Pointer to the device | |
672 | * @addr: Address of buffer to store the MAC in | |
673 | * @alen: Length of the buffer pointed to by addr, should be ETH_ALEN | |
674 | * | |
675 | * Search the firmware node for the best MAC address to use. 'mac-address' is | |
4c96b7dc JL |
676 | * checked first, because that is supposed to contain to "most recent" MAC |
677 | * address. If that isn't set, then 'local-mac-address' is checked next, | |
678 | * because that is the default address. If that isn't set, then the obsolete | |
679 | * 'address' is checked, just in case we're using an old device tree. | |
680 | * | |
681 | * Note that the 'address' property is supposed to contain a virtual address of | |
682 | * the register set, but some DTS files have redefined that property to be the | |
683 | * MAC address. | |
684 | * | |
685 | * All-zero MAC addresses are rejected, because those could be properties that | |
2f710a3a JL |
686 | * exist in the firmware tables, but were not updated by the firmware. For |
687 | * example, the DTS could define 'mac-address' and 'local-mac-address', with | |
688 | * zero MAC addresses. Some older U-Boots only initialized 'local-mac-address'. | |
689 | * In this case, the real MAC is in 'local-mac-address', and 'mac-address' | |
690 | * exists but is all zeros. | |
4c96b7dc JL |
691 | */ |
692 | void *device_get_mac_address(struct device *dev, char *addr, int alen) | |
693 | { | |
5b902d6f | 694 | char *res; |
4c96b7dc | 695 | |
5b902d6f JG |
696 | res = device_get_mac_addr(dev, "mac-address", addr, alen); |
697 | if (res) | |
698 | return res; | |
699 | ||
700 | res = device_get_mac_addr(dev, "local-mac-address", addr, alen); | |
701 | if (res) | |
702 | return res; | |
4c96b7dc JL |
703 | |
704 | return device_get_mac_addr(dev, "address", addr, alen); | |
705 | } | |
706 | EXPORT_SYMBOL(device_get_mac_address); |