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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 | ||
61f5e294 | 40 | static inline bool is_pset_node(struct fwnode_handle *fwnode) |
16ba08d5 RW |
41 | { |
42 | return fwnode && fwnode->type == FWNODE_PDATA; | |
43 | } | |
44 | ||
61f5e294 | 45 | static inline struct property_set *to_pset_node(struct fwnode_handle *fwnode) |
16ba08d5 | 46 | { |
61f5e294 | 47 | return is_pset_node(fwnode) ? |
16ba08d5 RW |
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); |
61f5e294 AS |
138 | else if (is_pset_node(fwnode)) |
139 | return !!pset_prop_get(to_pset_node(fwnode), propname); | |
e3f9e299 | 140 | return false; |
8a0662d9 RW |
141 | } |
142 | EXPORT_SYMBOL_GPL(fwnode_property_present); | |
143 | ||
b31384fa RW |
144 | /** |
145 | * device_property_read_u8_array - return a u8 array property of a device | |
146 | * @dev: Device to get the property of | |
147 | * @propname: Name of the property | |
5c0acf3b | 148 | * @val: The values are stored here or %NULL to return the number of values |
b31384fa RW |
149 | * @nval: Size of the @val array |
150 | * | |
151 | * Function reads an array of u8 properties with @propname from the device | |
152 | * firmware description and stores them to @val if found. | |
153 | * | |
5c0acf3b AH |
154 | * Return: number of values if @val was %NULL, |
155 | * %0 if the property was found (success), | |
b31384fa RW |
156 | * %-EINVAL if given arguments are not valid, |
157 | * %-ENODATA if the property does not have a value, | |
158 | * %-EPROTO if the property is not an array of numbers, | |
159 | * %-EOVERFLOW if the size of the property is not as expected. | |
4fa7508e | 160 | * %-ENXIO if no suitable firmware interface is present. |
b31384fa RW |
161 | */ |
162 | int device_property_read_u8_array(struct device *dev, const char *propname, | |
163 | u8 *val, size_t nval) | |
164 | { | |
9017f252 | 165 | return fwnode_property_read_u8_array(dev_fwnode(dev), propname, val, nval); |
b31384fa RW |
166 | } |
167 | EXPORT_SYMBOL_GPL(device_property_read_u8_array); | |
168 | ||
169 | /** | |
170 | * device_property_read_u16_array - return a u16 array property of a device | |
171 | * @dev: Device to get the property of | |
172 | * @propname: Name of the property | |
5c0acf3b | 173 | * @val: The values are stored here or %NULL to return the number of values |
b31384fa RW |
174 | * @nval: Size of the @val array |
175 | * | |
176 | * Function reads an array of u16 properties with @propname from the device | |
177 | * firmware description and stores them to @val if found. | |
178 | * | |
5c0acf3b AH |
179 | * Return: number of values if @val was %NULL, |
180 | * %0 if the property was found (success), | |
b31384fa RW |
181 | * %-EINVAL if given arguments are not valid, |
182 | * %-ENODATA if the property does not have a value, | |
183 | * %-EPROTO if the property is not an array of numbers, | |
184 | * %-EOVERFLOW if the size of the property is not as expected. | |
4fa7508e | 185 | * %-ENXIO if no suitable firmware interface is present. |
b31384fa RW |
186 | */ |
187 | int device_property_read_u16_array(struct device *dev, const char *propname, | |
188 | u16 *val, size_t nval) | |
189 | { | |
9017f252 | 190 | return fwnode_property_read_u16_array(dev_fwnode(dev), propname, val, nval); |
b31384fa RW |
191 | } |
192 | EXPORT_SYMBOL_GPL(device_property_read_u16_array); | |
193 | ||
194 | /** | |
195 | * device_property_read_u32_array - return a u32 array property of a device | |
196 | * @dev: Device to get the property of | |
197 | * @propname: Name of the property | |
5c0acf3b | 198 | * @val: The values are stored here or %NULL to return the number of values |
b31384fa RW |
199 | * @nval: Size of the @val array |
200 | * | |
201 | * Function reads an array of u32 properties with @propname from the device | |
202 | * firmware description and stores them to @val if found. | |
203 | * | |
5c0acf3b AH |
204 | * Return: number of values if @val was %NULL, |
205 | * %0 if the property was found (success), | |
b31384fa RW |
206 | * %-EINVAL if given arguments are not valid, |
207 | * %-ENODATA if the property does not have a value, | |
208 | * %-EPROTO if the property is not an array of numbers, | |
209 | * %-EOVERFLOW if the size of the property is not as expected. | |
4fa7508e | 210 | * %-ENXIO if no suitable firmware interface is present. |
b31384fa RW |
211 | */ |
212 | int device_property_read_u32_array(struct device *dev, const char *propname, | |
213 | u32 *val, size_t nval) | |
214 | { | |
9017f252 | 215 | return fwnode_property_read_u32_array(dev_fwnode(dev), propname, val, nval); |
b31384fa RW |
216 | } |
217 | EXPORT_SYMBOL_GPL(device_property_read_u32_array); | |
218 | ||
219 | /** | |
220 | * device_property_read_u64_array - return a u64 array property of a device | |
221 | * @dev: Device to get the property of | |
222 | * @propname: Name of the property | |
5c0acf3b | 223 | * @val: The values are stored here or %NULL to return the number of values |
b31384fa RW |
224 | * @nval: Size of the @val array |
225 | * | |
226 | * Function reads an array of u64 properties with @propname from the device | |
227 | * firmware description and stores them to @val if found. | |
228 | * | |
5c0acf3b AH |
229 | * Return: number of values if @val was %NULL, |
230 | * %0 if the property was found (success), | |
b31384fa RW |
231 | * %-EINVAL if given arguments are not valid, |
232 | * %-ENODATA if the property does not have a value, | |
233 | * %-EPROTO if the property is not an array of numbers, | |
234 | * %-EOVERFLOW if the size of the property is not as expected. | |
4fa7508e | 235 | * %-ENXIO if no suitable firmware interface is present. |
b31384fa RW |
236 | */ |
237 | int device_property_read_u64_array(struct device *dev, const char *propname, | |
238 | u64 *val, size_t nval) | |
239 | { | |
9017f252 | 240 | return fwnode_property_read_u64_array(dev_fwnode(dev), propname, val, nval); |
b31384fa RW |
241 | } |
242 | EXPORT_SYMBOL_GPL(device_property_read_u64_array); | |
243 | ||
244 | /** | |
245 | * device_property_read_string_array - return a string array property of device | |
246 | * @dev: Device to get the property of | |
247 | * @propname: Name of the property | |
5c0acf3b | 248 | * @val: The values are stored here or %NULL to return the number of values |
b31384fa RW |
249 | * @nval: Size of the @val array |
250 | * | |
251 | * Function reads an array of string properties with @propname from the device | |
252 | * firmware description and stores them to @val if found. | |
253 | * | |
5c0acf3b AH |
254 | * Return: number of values if @val was %NULL, |
255 | * %0 if the property was found (success), | |
b31384fa RW |
256 | * %-EINVAL if given arguments are not valid, |
257 | * %-ENODATA if the property does not have a value, | |
258 | * %-EPROTO or %-EILSEQ if the property is not an array of strings, | |
259 | * %-EOVERFLOW if the size of the property is not as expected. | |
4fa7508e | 260 | * %-ENXIO if no suitable firmware interface is present. |
b31384fa RW |
261 | */ |
262 | int device_property_read_string_array(struct device *dev, const char *propname, | |
263 | const char **val, size_t nval) | |
264 | { | |
9017f252 | 265 | return fwnode_property_read_string_array(dev_fwnode(dev), propname, val, nval); |
b31384fa RW |
266 | } |
267 | EXPORT_SYMBOL_GPL(device_property_read_string_array); | |
268 | ||
269 | /** | |
270 | * device_property_read_string - return a string property of a device | |
271 | * @dev: Device to get the property of | |
272 | * @propname: Name of the property | |
273 | * @val: The value is stored here | |
274 | * | |
275 | * Function reads property @propname from the device firmware description and | |
276 | * stores the value into @val if found. The value is checked to be a string. | |
277 | * | |
278 | * Return: %0 if the property was found (success), | |
279 | * %-EINVAL if given arguments are not valid, | |
280 | * %-ENODATA if the property does not have a value, | |
281 | * %-EPROTO or %-EILSEQ if the property type is not a string. | |
4fa7508e | 282 | * %-ENXIO if no suitable firmware interface is present. |
b31384fa RW |
283 | */ |
284 | int device_property_read_string(struct device *dev, const char *propname, | |
285 | const char **val) | |
286 | { | |
9017f252 | 287 | return fwnode_property_read_string(dev_fwnode(dev), propname, val); |
b31384fa RW |
288 | } |
289 | EXPORT_SYMBOL_GPL(device_property_read_string); | |
8a0662d9 | 290 | |
3f5c8d31 MW |
291 | /** |
292 | * device_property_match_string - find a string in an array and return index | |
293 | * @dev: Device to get the property of | |
294 | * @propname: Name of the property holding the array | |
295 | * @string: String to look for | |
296 | * | |
297 | * Find a given string in a string array and if it is found return the | |
298 | * index back. | |
299 | * | |
300 | * Return: %0 if the property was found (success), | |
301 | * %-EINVAL if given arguments are not valid, | |
302 | * %-ENODATA if the property does not have a value, | |
303 | * %-EPROTO if the property is not an array of strings, | |
304 | * %-ENXIO if no suitable firmware interface is present. | |
305 | */ | |
306 | int device_property_match_string(struct device *dev, const char *propname, | |
307 | const char *string) | |
308 | { | |
309 | return fwnode_property_match_string(dev_fwnode(dev), propname, string); | |
310 | } | |
311 | EXPORT_SYMBOL_GPL(device_property_match_string); | |
312 | ||
9017f252 RW |
313 | #define OF_DEV_PROP_READ_ARRAY(node, propname, type, val, nval) \ |
314 | (val) ? of_property_read_##type##_array((node), (propname), (val), (nval)) \ | |
315 | : of_property_count_elems_of_size((node), (propname), sizeof(type)) | |
316 | ||
8a0662d9 RW |
317 | #define FWNODE_PROP_READ_ARRAY(_fwnode_, _propname_, _type_, _proptype_, _val_, _nval_) \ |
318 | ({ \ | |
319 | int _ret_; \ | |
320 | if (is_of_node(_fwnode_)) \ | |
c181fb3e | 321 | _ret_ = OF_DEV_PROP_READ_ARRAY(to_of_node(_fwnode_), _propname_, \ |
8a0662d9 RW |
322 | _type_, _val_, _nval_); \ |
323 | else if (is_acpi_node(_fwnode_)) \ | |
3a7a2ab8 RW |
324 | _ret_ = acpi_node_prop_read(_fwnode_, _propname_, _proptype_, \ |
325 | _val_, _nval_); \ | |
61f5e294 AS |
326 | else if (is_pset_node(_fwnode_)) \ |
327 | _ret_ = pset_prop_read_array(to_pset_node(_fwnode_), _propname_, \ | |
16ba08d5 | 328 | _proptype_, _val_, _nval_); \ |
4fa7508e GR |
329 | else \ |
330 | _ret_ = -ENXIO; \ | |
8a0662d9 RW |
331 | _ret_; \ |
332 | }) | |
333 | ||
334 | /** | |
335 | * fwnode_property_read_u8_array - return a u8 array property of firmware node | |
336 | * @fwnode: Firmware node to get the property of | |
337 | * @propname: Name of the property | |
5c0acf3b | 338 | * @val: The values are stored here or %NULL to return the number of values |
8a0662d9 RW |
339 | * @nval: Size of the @val array |
340 | * | |
341 | * Read an array of u8 properties with @propname from @fwnode and stores them to | |
342 | * @val if found. | |
343 | * | |
5c0acf3b AH |
344 | * Return: number of values if @val was %NULL, |
345 | * %0 if the property was found (success), | |
8a0662d9 RW |
346 | * %-EINVAL if given arguments are not valid, |
347 | * %-ENODATA if the property does not have a value, | |
348 | * %-EPROTO if the property is not an array of numbers, | |
349 | * %-EOVERFLOW if the size of the property is not as expected, | |
350 | * %-ENXIO if no suitable firmware interface is present. | |
351 | */ | |
352 | int fwnode_property_read_u8_array(struct fwnode_handle *fwnode, | |
353 | const char *propname, u8 *val, size_t nval) | |
354 | { | |
355 | return FWNODE_PROP_READ_ARRAY(fwnode, propname, u8, DEV_PROP_U8, | |
356 | val, nval); | |
357 | } | |
358 | EXPORT_SYMBOL_GPL(fwnode_property_read_u8_array); | |
359 | ||
360 | /** | |
361 | * fwnode_property_read_u16_array - return a u16 array property of firmware node | |
362 | * @fwnode: Firmware node to get the property of | |
363 | * @propname: Name of the property | |
5c0acf3b | 364 | * @val: The values are stored here or %NULL to return the number of values |
8a0662d9 RW |
365 | * @nval: Size of the @val array |
366 | * | |
367 | * Read an array of u16 properties with @propname from @fwnode and store them to | |
368 | * @val if found. | |
369 | * | |
5c0acf3b AH |
370 | * Return: number of values if @val was %NULL, |
371 | * %0 if the property was found (success), | |
8a0662d9 RW |
372 | * %-EINVAL if given arguments are not valid, |
373 | * %-ENODATA if the property does not have a value, | |
374 | * %-EPROTO if the property is not an array of numbers, | |
375 | * %-EOVERFLOW if the size of the property is not as expected, | |
376 | * %-ENXIO if no suitable firmware interface is present. | |
377 | */ | |
378 | int fwnode_property_read_u16_array(struct fwnode_handle *fwnode, | |
379 | const char *propname, u16 *val, size_t nval) | |
380 | { | |
381 | return FWNODE_PROP_READ_ARRAY(fwnode, propname, u16, DEV_PROP_U16, | |
382 | val, nval); | |
383 | } | |
384 | EXPORT_SYMBOL_GPL(fwnode_property_read_u16_array); | |
385 | ||
386 | /** | |
387 | * fwnode_property_read_u32_array - return a u32 array property of firmware node | |
388 | * @fwnode: Firmware node to get the property of | |
389 | * @propname: Name of the property | |
5c0acf3b | 390 | * @val: The values are stored here or %NULL to return the number of values |
8a0662d9 RW |
391 | * @nval: Size of the @val array |
392 | * | |
393 | * Read an array of u32 properties with @propname from @fwnode store them to | |
394 | * @val if found. | |
395 | * | |
5c0acf3b AH |
396 | * Return: number of values if @val was %NULL, |
397 | * %0 if the property was found (success), | |
8a0662d9 RW |
398 | * %-EINVAL if given arguments are not valid, |
399 | * %-ENODATA if the property does not have a value, | |
400 | * %-EPROTO if the property is not an array of numbers, | |
401 | * %-EOVERFLOW if the size of the property is not as expected, | |
402 | * %-ENXIO if no suitable firmware interface is present. | |
403 | */ | |
404 | int fwnode_property_read_u32_array(struct fwnode_handle *fwnode, | |
405 | const char *propname, u32 *val, size_t nval) | |
406 | { | |
407 | return FWNODE_PROP_READ_ARRAY(fwnode, propname, u32, DEV_PROP_U32, | |
408 | val, nval); | |
409 | } | |
410 | EXPORT_SYMBOL_GPL(fwnode_property_read_u32_array); | |
411 | ||
412 | /** | |
413 | * fwnode_property_read_u64_array - return a u64 array property firmware node | |
414 | * @fwnode: Firmware node to get the property of | |
415 | * @propname: Name of the property | |
5c0acf3b | 416 | * @val: The values are stored here or %NULL to return the number of values |
8a0662d9 RW |
417 | * @nval: Size of the @val array |
418 | * | |
419 | * Read an array of u64 properties with @propname from @fwnode and store them to | |
420 | * @val if found. | |
421 | * | |
5c0acf3b AH |
422 | * Return: number of values if @val was %NULL, |
423 | * %0 if the property was found (success), | |
8a0662d9 RW |
424 | * %-EINVAL if given arguments are not valid, |
425 | * %-ENODATA if the property does not have a value, | |
426 | * %-EPROTO if the property is not an array of numbers, | |
427 | * %-EOVERFLOW if the size of the property is not as expected, | |
428 | * %-ENXIO if no suitable firmware interface is present. | |
429 | */ | |
430 | int fwnode_property_read_u64_array(struct fwnode_handle *fwnode, | |
431 | const char *propname, u64 *val, size_t nval) | |
432 | { | |
433 | return FWNODE_PROP_READ_ARRAY(fwnode, propname, u64, DEV_PROP_U64, | |
434 | val, nval); | |
435 | } | |
436 | EXPORT_SYMBOL_GPL(fwnode_property_read_u64_array); | |
437 | ||
438 | /** | |
439 | * fwnode_property_read_string_array - return string array property of a node | |
440 | * @fwnode: Firmware node to get the property of | |
441 | * @propname: Name of the property | |
5c0acf3b | 442 | * @val: The values are stored here or %NULL to return the number of values |
8a0662d9 RW |
443 | * @nval: Size of the @val array |
444 | * | |
445 | * Read an string list property @propname from the given firmware node and store | |
446 | * them to @val if found. | |
447 | * | |
5c0acf3b AH |
448 | * Return: number of values if @val was %NULL, |
449 | * %0 if the property was found (success), | |
8a0662d9 RW |
450 | * %-EINVAL if given arguments are not valid, |
451 | * %-ENODATA if the property does not have a value, | |
452 | * %-EPROTO if the property is not an array of strings, | |
453 | * %-EOVERFLOW if the size of the property is not as expected, | |
454 | * %-ENXIO if no suitable firmware interface is present. | |
455 | */ | |
456 | int fwnode_property_read_string_array(struct fwnode_handle *fwnode, | |
457 | const char *propname, const char **val, | |
458 | size_t nval) | |
459 | { | |
460 | if (is_of_node(fwnode)) | |
f42712a9 | 461 | return val ? |
c181fb3e AS |
462 | of_property_read_string_array(to_of_node(fwnode), |
463 | propname, val, nval) : | |
464 | of_property_count_strings(to_of_node(fwnode), propname); | |
8a0662d9 | 465 | else if (is_acpi_node(fwnode)) |
3a7a2ab8 RW |
466 | return acpi_node_prop_read(fwnode, propname, DEV_PROP_STRING, |
467 | val, nval); | |
61f5e294 AS |
468 | else if (is_pset_node(fwnode)) |
469 | return pset_prop_read_array(to_pset_node(fwnode), propname, | |
4fa7508e GR |
470 | DEV_PROP_STRING, val, nval); |
471 | return -ENXIO; | |
8a0662d9 RW |
472 | } |
473 | EXPORT_SYMBOL_GPL(fwnode_property_read_string_array); | |
474 | ||
475 | /** | |
476 | * fwnode_property_read_string - return a string property of a firmware node | |
477 | * @fwnode: Firmware node to get the property of | |
478 | * @propname: Name of the property | |
479 | * @val: The value is stored here | |
480 | * | |
481 | * Read property @propname from the given firmware node and store the value into | |
482 | * @val if found. The value is checked to be a string. | |
483 | * | |
484 | * Return: %0 if the property was found (success), | |
485 | * %-EINVAL if given arguments are not valid, | |
486 | * %-ENODATA if the property does not have a value, | |
487 | * %-EPROTO or %-EILSEQ if the property is not a string, | |
488 | * %-ENXIO if no suitable firmware interface is present. | |
489 | */ | |
490 | int fwnode_property_read_string(struct fwnode_handle *fwnode, | |
491 | const char *propname, const char **val) | |
492 | { | |
493 | if (is_of_node(fwnode)) | |
c181fb3e | 494 | return of_property_read_string(to_of_node(fwnode), propname, val); |
8a0662d9 | 495 | else if (is_acpi_node(fwnode)) |
3a7a2ab8 RW |
496 | return acpi_node_prop_read(fwnode, propname, DEV_PROP_STRING, |
497 | val, 1); | |
61f5e294 AS |
498 | else if (is_pset_node(fwnode)) |
499 | return pset_prop_read_array(to_pset_node(fwnode), propname, | |
e3f9e299 AS |
500 | DEV_PROP_STRING, val, 1); |
501 | return -ENXIO; | |
8a0662d9 RW |
502 | } |
503 | EXPORT_SYMBOL_GPL(fwnode_property_read_string); | |
504 | ||
3f5c8d31 MW |
505 | /** |
506 | * fwnode_property_match_string - find a string in an array and return index | |
507 | * @fwnode: Firmware node to get the property of | |
508 | * @propname: Name of the property holding the array | |
509 | * @string: String to look for | |
510 | * | |
511 | * Find a given string in a string array and if it is found return the | |
512 | * index back. | |
513 | * | |
514 | * Return: %0 if the property was found (success), | |
515 | * %-EINVAL if given arguments are not valid, | |
516 | * %-ENODATA if the property does not have a value, | |
517 | * %-EPROTO if the property is not an array of strings, | |
518 | * %-ENXIO if no suitable firmware interface is present. | |
519 | */ | |
520 | int fwnode_property_match_string(struct fwnode_handle *fwnode, | |
521 | const char *propname, const char *string) | |
522 | { | |
523 | const char **values; | |
524 | int nval, ret, i; | |
525 | ||
526 | nval = fwnode_property_read_string_array(fwnode, propname, NULL, 0); | |
527 | if (nval < 0) | |
528 | return nval; | |
529 | ||
530 | values = kcalloc(nval, sizeof(*values), GFP_KERNEL); | |
531 | if (!values) | |
532 | return -ENOMEM; | |
533 | ||
534 | ret = fwnode_property_read_string_array(fwnode, propname, values, nval); | |
535 | if (ret < 0) | |
536 | goto out; | |
537 | ||
538 | ret = -ENODATA; | |
539 | for (i = 0; i < nval; i++) { | |
540 | if (!strcmp(values[i], string)) { | |
541 | ret = i; | |
542 | break; | |
543 | } | |
544 | } | |
545 | out: | |
546 | kfree(values); | |
547 | return ret; | |
548 | } | |
549 | EXPORT_SYMBOL_GPL(fwnode_property_match_string); | |
550 | ||
8a0662d9 RW |
551 | /** |
552 | * device_get_next_child_node - Return the next child node handle for a device | |
553 | * @dev: Device to find the next child node for. | |
554 | * @child: Handle to one of the device's child nodes or a null handle. | |
555 | */ | |
556 | struct fwnode_handle *device_get_next_child_node(struct device *dev, | |
557 | struct fwnode_handle *child) | |
558 | { | |
559 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) { | |
560 | struct device_node *node; | |
561 | ||
c181fb3e | 562 | node = of_get_next_available_child(dev->of_node, to_of_node(child)); |
8a0662d9 RW |
563 | if (node) |
564 | return &node->fwnode; | |
565 | } else if (IS_ENABLED(CONFIG_ACPI)) { | |
504a3374 | 566 | return acpi_get_next_subnode(dev, child); |
8a0662d9 RW |
567 | } |
568 | return NULL; | |
569 | } | |
570 | EXPORT_SYMBOL_GPL(device_get_next_child_node); | |
571 | ||
572 | /** | |
573 | * fwnode_handle_put - Drop reference to a device node | |
574 | * @fwnode: Pointer to the device node to drop the reference to. | |
575 | * | |
576 | * This has to be used when terminating device_for_each_child_node() iteration | |
577 | * with break or return to prevent stale device node references from being left | |
578 | * behind. | |
579 | */ | |
580 | void fwnode_handle_put(struct fwnode_handle *fwnode) | |
581 | { | |
582 | if (is_of_node(fwnode)) | |
c181fb3e | 583 | of_node_put(to_of_node(fwnode)); |
8a0662d9 RW |
584 | } |
585 | EXPORT_SYMBOL_GPL(fwnode_handle_put); | |
586 | ||
587 | /** | |
588 | * device_get_child_node_count - return the number of child nodes for device | |
589 | * @dev: Device to cound the child nodes for | |
590 | */ | |
591 | unsigned int device_get_child_node_count(struct device *dev) | |
592 | { | |
593 | struct fwnode_handle *child; | |
594 | unsigned int count = 0; | |
595 | ||
596 | device_for_each_child_node(dev, child) | |
597 | count++; | |
598 | ||
599 | return count; | |
600 | } | |
601 | EXPORT_SYMBOL_GPL(device_get_child_node_count); | |
05ca5560 | 602 | |
e5e55864 SS |
603 | bool device_dma_supported(struct device *dev) |
604 | { | |
605 | /* For DT, this is always supported. | |
606 | * For ACPI, this depends on CCA, which | |
607 | * is determined by the acpi_dma_supported(). | |
608 | */ | |
609 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) | |
610 | return true; | |
611 | ||
612 | return acpi_dma_supported(ACPI_COMPANION(dev)); | |
613 | } | |
614 | EXPORT_SYMBOL_GPL(device_dma_supported); | |
615 | ||
616 | enum dev_dma_attr device_get_dma_attr(struct device *dev) | |
617 | { | |
618 | enum dev_dma_attr attr = DEV_DMA_NOT_SUPPORTED; | |
619 | ||
620 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) { | |
621 | if (of_dma_is_coherent(dev->of_node)) | |
622 | attr = DEV_DMA_COHERENT; | |
623 | else | |
624 | attr = DEV_DMA_NON_COHERENT; | |
625 | } else | |
626 | attr = acpi_get_dma_attr(ACPI_COMPANION(dev)); | |
627 | ||
628 | return attr; | |
629 | } | |
630 | EXPORT_SYMBOL_GPL(device_get_dma_attr); | |
631 | ||
4c96b7dc | 632 | /** |
2f710a3a | 633 | * device_get_phy_mode - Get phy mode for given device |
4c96b7dc JL |
634 | * @dev: Pointer to the given device |
635 | * | |
636 | * The function gets phy interface string from property 'phy-mode' or | |
637 | * 'phy-connection-type', and return its index in phy_modes table, or errno in | |
638 | * error case. | |
639 | */ | |
640 | int device_get_phy_mode(struct device *dev) | |
641 | { | |
642 | const char *pm; | |
643 | int err, i; | |
644 | ||
645 | err = device_property_read_string(dev, "phy-mode", &pm); | |
646 | if (err < 0) | |
647 | err = device_property_read_string(dev, | |
648 | "phy-connection-type", &pm); | |
649 | if (err < 0) | |
650 | return err; | |
651 | ||
652 | for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++) | |
653 | if (!strcasecmp(pm, phy_modes(i))) | |
654 | return i; | |
655 | ||
656 | return -ENODEV; | |
657 | } | |
658 | EXPORT_SYMBOL_GPL(device_get_phy_mode); | |
659 | ||
660 | static void *device_get_mac_addr(struct device *dev, | |
661 | const char *name, char *addr, | |
662 | int alen) | |
663 | { | |
664 | int ret = device_property_read_u8_array(dev, name, addr, alen); | |
665 | ||
2f710a3a | 666 | if (ret == 0 && alen == ETH_ALEN && is_valid_ether_addr(addr)) |
4c96b7dc JL |
667 | return addr; |
668 | return NULL; | |
669 | } | |
670 | ||
671 | /** | |
2f710a3a JL |
672 | * device_get_mac_address - Get the MAC for a given device |
673 | * @dev: Pointer to the device | |
674 | * @addr: Address of buffer to store the MAC in | |
675 | * @alen: Length of the buffer pointed to by addr, should be ETH_ALEN | |
676 | * | |
677 | * Search the firmware node for the best MAC address to use. 'mac-address' is | |
4c96b7dc JL |
678 | * checked first, because that is supposed to contain to "most recent" MAC |
679 | * address. If that isn't set, then 'local-mac-address' is checked next, | |
680 | * because that is the default address. If that isn't set, then the obsolete | |
681 | * 'address' is checked, just in case we're using an old device tree. | |
682 | * | |
683 | * Note that the 'address' property is supposed to contain a virtual address of | |
684 | * the register set, but some DTS files have redefined that property to be the | |
685 | * MAC address. | |
686 | * | |
687 | * All-zero MAC addresses are rejected, because those could be properties that | |
2f710a3a JL |
688 | * exist in the firmware tables, but were not updated by the firmware. For |
689 | * example, the DTS could define 'mac-address' and 'local-mac-address', with | |
690 | * zero MAC addresses. Some older U-Boots only initialized 'local-mac-address'. | |
691 | * In this case, the real MAC is in 'local-mac-address', and 'mac-address' | |
692 | * exists but is all zeros. | |
4c96b7dc JL |
693 | */ |
694 | void *device_get_mac_address(struct device *dev, char *addr, int alen) | |
695 | { | |
5b902d6f | 696 | char *res; |
4c96b7dc | 697 | |
5b902d6f JG |
698 | res = device_get_mac_addr(dev, "mac-address", addr, alen); |
699 | if (res) | |
700 | return res; | |
701 | ||
702 | res = device_get_mac_addr(dev, "local-mac-address", addr, alen); | |
703 | if (res) | |
704 | return res; | |
4c96b7dc JL |
705 | |
706 | return device_get_mac_addr(dev, "address", addr, alen); | |
707 | } | |
708 | EXPORT_SYMBOL(device_get_mac_address); |