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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _LINUX_MODULE_PARAMS_H |
3 | #define _LINUX_MODULE_PARAMS_H | |
4 | /* (C) Copyright 2001, 2002 Rusty Russell IBM Corporation */ | |
5 | #include <linux/init.h> | |
6 | #include <linux/stringify.h> | |
7 | #include <linux/kernel.h> | |
8 | ||
9 | /* You can override this manually, but generally this should match the | |
10 | module name. */ | |
11 | #ifdef MODULE | |
12 | #define MODULE_PARAM_PREFIX /* empty */ | |
898490c0 | 13 | #define __MODULE_INFO_PREFIX /* empty */ |
1da177e4 | 14 | #else |
367cb704 | 15 | #define MODULE_PARAM_PREFIX KBUILD_MODNAME "." |
898490c0 AG |
16 | /* We cannot use MODULE_PARAM_PREFIX because some modules override it. */ |
17 | #define __MODULE_INFO_PREFIX KBUILD_MODNAME "." | |
1da177e4 LT |
18 | #endif |
19 | ||
730b69d2 RR |
20 | /* Chosen so that structs with an unsigned long line up. */ |
21 | #define MAX_PARAM_PREFIX_LEN (64 - sizeof(unsigned long)) | |
22 | ||
1da177e4 | 23 | #define __MODULE_INFO(tag, name, info) \ |
34182eea | 24 | static const char __UNIQUE_ID(name)[] \ |
b6472776 | 25 | __used __attribute__((section(".modinfo"), unused, aligned(1))) \ |
898490c0 AG |
26 | = __MODULE_INFO_PREFIX __stringify(tag) "=" info |
27 | ||
1da177e4 LT |
28 | #define __MODULE_PARM_TYPE(name, _type) \ |
29 | __MODULE_INFO(parmtype, name##type, #name ":" _type) | |
30 | ||
639938eb PG |
31 | /* One for each parameter, describing how to use it. Some files do |
32 | multiple of these per line, so can't just use MODULE_INFO. */ | |
33 | #define MODULE_PARM_DESC(_parm, desc) \ | |
34 | __MODULE_INFO(parm, _parm, #_parm ":" desc) | |
35 | ||
1da177e4 LT |
36 | struct kernel_param; |
37 | ||
ab013c5f SR |
38 | /* |
39 | * Flags available for kernel_param_ops | |
40 | * | |
41 | * NOARG - the parameter allows for no argument (foo instead of foo=1) | |
42 | */ | |
43 | enum { | |
6a4c2643 | 44 | KERNEL_PARAM_OPS_FL_NOARG = (1 << 0) |
ab013c5f SR |
45 | }; |
46 | ||
9bbb9e5a | 47 | struct kernel_param_ops { |
ab013c5f SR |
48 | /* How the ops should behave */ |
49 | unsigned int flags; | |
9bbb9e5a RR |
50 | /* Returns 0, or -errno. arg is in kp->arg. */ |
51 | int (*set)(const char *val, const struct kernel_param *kp); | |
52 | /* Returns length written or -errno. Buffer is 4k (ie. be short!) */ | |
53 | int (*get)(char *buffer, const struct kernel_param *kp); | |
e6df34a4 RR |
54 | /* Optional function to free kp->arg when module unloaded. */ |
55 | void (*free)(void *arg); | |
9bbb9e5a | 56 | }; |
1da177e4 | 57 | |
91f9d330 JN |
58 | /* |
59 | * Flags available for kernel_param | |
60 | * | |
61 | * UNSAFE - the parameter is dangerous and setting it will taint the kernel | |
bf616d21 | 62 | * HWPARAM - Hardware param not permitted in lockdown mode |
91f9d330 JN |
63 | */ |
64 | enum { | |
bf616d21 DH |
65 | KERNEL_PARAM_FL_UNSAFE = (1 << 0), |
66 | KERNEL_PARAM_FL_HWPARAM = (1 << 1), | |
91f9d330 JN |
67 | }; |
68 | ||
1da177e4 LT |
69 | struct kernel_param { |
70 | const char *name; | |
b51d23e4 | 71 | struct module *mod; |
9bbb9e5a | 72 | const struct kernel_param_ops *ops; |
5104b7d7 | 73 | const u16 perm; |
91f9d330 JN |
74 | s8 level; |
75 | u8 flags; | |
22e48eaf JB |
76 | union { |
77 | void *arg; | |
78 | const struct kparam_string *str; | |
79 | const struct kparam_array *arr; | |
80 | }; | |
1da177e4 LT |
81 | }; |
82 | ||
63a12d9d GU |
83 | extern const struct kernel_param __start___param[], __stop___param[]; |
84 | ||
1da177e4 LT |
85 | /* Special one for strings we want to copy into */ |
86 | struct kparam_string { | |
87 | unsigned int maxlen; | |
88 | char *string; | |
89 | }; | |
90 | ||
91 | /* Special one for arrays */ | |
92 | struct kparam_array | |
93 | { | |
94 | unsigned int max; | |
c5be0b2e | 95 | unsigned int elemsize; |
1da177e4 | 96 | unsigned int *num; |
9bbb9e5a | 97 | const struct kernel_param_ops *ops; |
1da177e4 LT |
98 | void *elem; |
99 | }; | |
100 | ||
546970bc RR |
101 | /** |
102 | * module_param - typesafe helper for a module/cmdline parameter | |
103 | * @value: the variable to alter, and exposed parameter name. | |
104 | * @type: the type of the parameter | |
105 | * @perm: visibility in sysfs. | |
106 | * | |
107 | * @value becomes the module parameter, or (prefixed by KBUILD_MODNAME and a | |
108 | * ".") the kernel commandline parameter. Note that - is changed to _, so | |
109 | * the user can use "foo-bar=1" even for variable "foo_bar". | |
110 | * | |
111 | * @perm is 0 if the the variable is not to appear in sysfs, or 0444 | |
112 | * for world-readable, 0644 for root-writable, etc. Note that if it | |
b51d23e4 | 113 | * is writable, you may need to use kernel_param_lock() around |
546970bc RR |
114 | * accesses (esp. charp, which can be kfreed when it changes). |
115 | * | |
116 | * The @type is simply pasted to refer to a param_ops_##type and a | |
117 | * param_check_##type: for convenience many standard types are provided but | |
118 | * you can create your own by defining those variables. | |
119 | * | |
120 | * Standard types are: | |
121 | * byte, short, ushort, int, uint, long, ulong | |
122 | * charp: a character pointer | |
123 | * bool: a bool, values 0/1, y/n, Y/N. | |
124 | * invbool: the above, only sense-reversed (N = true). | |
125 | */ | |
126 | #define module_param(name, type, perm) \ | |
127 | module_param_named(name, name, type, perm) | |
128 | ||
3baee201 JN |
129 | /** |
130 | * module_param_unsafe - same as module_param but taints kernel | |
131 | */ | |
132 | #define module_param_unsafe(name, type, perm) \ | |
133 | module_param_named_unsafe(name, name, type, perm) | |
134 | ||
546970bc RR |
135 | /** |
136 | * module_param_named - typesafe helper for a renamed module/cmdline parameter | |
137 | * @name: a valid C identifier which is the parameter name. | |
138 | * @value: the actual lvalue to alter. | |
139 | * @type: the type of the parameter | |
140 | * @perm: visibility in sysfs. | |
141 | * | |
142 | * Usually it's a good idea to have variable names and user-exposed names the | |
143 | * same, but that's harder if the variable must be non-static or is inside a | |
144 | * structure. This allows exposure under a different name. | |
145 | */ | |
146 | #define module_param_named(name, value, type, perm) \ | |
147 | param_check_##type(name, &(value)); \ | |
148 | module_param_cb(name, ¶m_ops_##type, &value, perm); \ | |
149 | __MODULE_PARM_TYPE(name, #type) | |
150 | ||
3baee201 JN |
151 | /** |
152 | * module_param_named_unsafe - same as module_param_named but taints kernel | |
153 | */ | |
154 | #define module_param_named_unsafe(name, value, type, perm) \ | |
155 | param_check_##type(name, &(value)); \ | |
156 | module_param_cb_unsafe(name, ¶m_ops_##type, &value, perm); \ | |
157 | __MODULE_PARM_TYPE(name, #type) | |
158 | ||
546970bc RR |
159 | /** |
160 | * module_param_cb - general callback for a module/cmdline parameter | |
161 | * @name: a valid C identifier which is the parameter name. | |
162 | * @ops: the set & get operations for this parameter. | |
163 | * @perm: visibility in sysfs. | |
164 | * | |
165 | * The ops can have NULL set or get functions. | |
166 | */ | |
167 | #define module_param_cb(name, ops, arg, perm) \ | |
91f9d330 | 168 | __module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, -1, 0) |
026cee00 | 169 | |
3baee201 JN |
170 | #define module_param_cb_unsafe(name, ops, arg, perm) \ |
171 | __module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, -1, \ | |
172 | KERNEL_PARAM_FL_UNSAFE) | |
173 | ||
026cee00 PM |
174 | /** |
175 | * <level>_param_cb - general callback for a module/cmdline parameter | |
176 | * to be evaluated before certain initcall level | |
177 | * @name: a valid C identifier which is the parameter name. | |
178 | * @ops: the set & get operations for this parameter. | |
179 | * @perm: visibility in sysfs. | |
180 | * | |
181 | * The ops can have NULL set or get functions. | |
182 | */ | |
183 | #define __level_param_cb(name, ops, arg, perm, level) \ | |
91f9d330 | 184 | __module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, level, 0) |
026cee00 PM |
185 | |
186 | #define core_param_cb(name, ops, arg, perm) \ | |
187 | __level_param_cb(name, ops, arg, perm, 1) | |
188 | ||
189 | #define postcore_param_cb(name, ops, arg, perm) \ | |
190 | __level_param_cb(name, ops, arg, perm, 2) | |
191 | ||
192 | #define arch_param_cb(name, ops, arg, perm) \ | |
193 | __level_param_cb(name, ops, arg, perm, 3) | |
194 | ||
195 | #define subsys_param_cb(name, ops, arg, perm) \ | |
196 | __level_param_cb(name, ops, arg, perm, 4) | |
197 | ||
198 | #define fs_param_cb(name, ops, arg, perm) \ | |
199 | __level_param_cb(name, ops, arg, perm, 5) | |
200 | ||
201 | #define device_param_cb(name, ops, arg, perm) \ | |
202 | __level_param_cb(name, ops, arg, perm, 6) | |
203 | ||
204 | #define late_param_cb(name, ops, arg, perm) \ | |
205 | __level_param_cb(name, ops, arg, perm, 7) | |
546970bc | 206 | |
91d35dd9 IK |
207 | /* On alpha, ia64 and ppc64 relocations to global data cannot go into |
208 | read-only sections (which is part of respective UNIX ABI on these | |
209 | platforms). So 'const' makes no sense and even causes compile failures | |
210 | with some compilers. */ | |
211 | #if defined(CONFIG_ALPHA) || defined(CONFIG_IA64) || defined(CONFIG_PPC64) | |
212 | #define __moduleparam_const | |
213 | #else | |
214 | #define __moduleparam_const const | |
215 | #endif | |
216 | ||
1da177e4 | 217 | /* This is the fundamental function for registering boot/module |
546970bc | 218 | parameters. */ |
91f9d330 | 219 | #define __module_param_call(prefix, name, ops, arg, perm, level, flags) \ |
9774a1f5 | 220 | /* Default value instead of permissions? */ \ |
b51d23e4 | 221 | static const char __param_str_##name[] = prefix #name; \ |
91d35dd9 | 222 | static struct kernel_param __moduleparam_const __param_##name \ |
3ff6eecc | 223 | __used \ |
1da177e4 | 224 | __attribute__ ((unused,__section__ ("__param"),aligned(sizeof(void *)))) \ |
b51d23e4 DS |
225 | = { __param_str_##name, THIS_MODULE, ops, \ |
226 | VERIFY_OCTAL_PERMISSIONS(perm), level, flags, { arg } } | |
9bbb9e5a RR |
227 | |
228 | /* Obsolete - use module_param_cb() */ | |
ece1996a | 229 | #define module_param_call(name, _set, _get, arg, perm) \ |
b2f270e8 | 230 | static const struct kernel_param_ops __param_ops_##name = \ |
ece1996a | 231 | { .flags = 0, .set = _set, .get = _get }; \ |
9bbb9e5a | 232 | __module_param_call(MODULE_PARAM_PREFIX, \ |
b2f270e8 | 233 | name, &__param_ops_##name, arg, perm, -1, 0) |
1da177e4 | 234 | |
907b29eb | 235 | #ifdef CONFIG_SYSFS |
b51d23e4 DS |
236 | extern void kernel_param_lock(struct module *mod); |
237 | extern void kernel_param_unlock(struct module *mod); | |
907b29eb | 238 | #else |
b51d23e4 | 239 | static inline void kernel_param_lock(struct module *mod) |
907b29eb RR |
240 | { |
241 | } | |
b51d23e4 | 242 | static inline void kernel_param_unlock(struct module *mod) |
907b29eb RR |
243 | { |
244 | } | |
245 | #endif | |
246 | ||
67e67cea RR |
247 | #ifndef MODULE |
248 | /** | |
249 | * core_param - define a historical core kernel parameter. | |
250 | * @name: the name of the cmdline and sysfs parameter (often the same as var) | |
251 | * @var: the variable | |
546970bc | 252 | * @type: the type of the parameter |
67e67cea RR |
253 | * @perm: visibility in sysfs |
254 | * | |
255 | * core_param is just like module_param(), but cannot be modular and | |
256 | * doesn't add a prefix (such as "printk."). This is for compatibility | |
257 | * with __setup(), and it makes sense as truly core parameters aren't | |
258 | * tied to the particular file they're in. | |
259 | */ | |
260 | #define core_param(name, var, type, perm) \ | |
261 | param_check_##type(name, &(var)); \ | |
91f9d330 | 262 | __module_param_call("", name, ¶m_ops_##type, &var, perm, -1, 0) |
ec0ccc16 DT |
263 | |
264 | /** | |
265 | * core_param_unsafe - same as core_param but taints kernel | |
266 | */ | |
267 | #define core_param_unsafe(name, var, type, perm) \ | |
268 | param_check_##type(name, &(var)); \ | |
269 | __module_param_call("", name, ¶m_ops_##type, &var, perm, \ | |
270 | -1, KERNEL_PARAM_FL_UNSAFE) | |
271 | ||
67e67cea RR |
272 | #endif /* !MODULE */ |
273 | ||
546970bc RR |
274 | /** |
275 | * module_param_string - a char array parameter | |
276 | * @name: the name of the parameter | |
277 | * @string: the string variable | |
278 | * @len: the maximum length of the string, incl. terminator | |
279 | * @perm: visibility in sysfs. | |
280 | * | |
281 | * This actually copies the string when it's set (unlike type charp). | |
282 | * @len is usually just sizeof(string). | |
283 | */ | |
1da177e4 | 284 | #define module_param_string(name, string, len, perm) \ |
22e48eaf | 285 | static const struct kparam_string __param_string_##name \ |
1da177e4 | 286 | = { len, string }; \ |
fddd5201 | 287 | __module_param_call(MODULE_PARAM_PREFIX, name, \ |
9bbb9e5a | 288 | ¶m_ops_string, \ |
91f9d330 | 289 | .str = &__param_string_##name, perm, -1, 0);\ |
1da177e4 LT |
290 | __MODULE_PARM_TYPE(name, "string") |
291 | ||
b1e4d20c MS |
292 | /** |
293 | * parameq - checks if two parameter names match | |
294 | * @name1: parameter name 1 | |
295 | * @name2: parameter name 2 | |
296 | * | |
297 | * Returns true if the two parameter names are equal. | |
298 | * Dashes (-) are considered equal to underscores (_). | |
299 | */ | |
300 | extern bool parameq(const char *name1, const char *name2); | |
301 | ||
302 | /** | |
303 | * parameqn - checks if two parameter names match | |
304 | * @name1: parameter name 1 | |
305 | * @name2: parameter name 2 | |
306 | * @n: the length to compare | |
307 | * | |
308 | * Similar to parameq(), except it compares @n characters. | |
309 | */ | |
310 | extern bool parameqn(const char *name1, const char *name2, size_t n); | |
311 | ||
1da177e4 | 312 | /* Called on module insert or kernel boot */ |
51e158c1 | 313 | extern char *parse_args(const char *name, |
1da177e4 | 314 | char *args, |
914dcaa8 | 315 | const struct kernel_param *params, |
1da177e4 | 316 | unsigned num, |
026cee00 PM |
317 | s16 level_min, |
318 | s16 level_max, | |
ecc86170 | 319 | void *arg, |
9fb48c74 | 320 | int (*unknown)(char *param, char *val, |
ecc86170 | 321 | const char *doing, void *arg)); |
1da177e4 | 322 | |
e180a6b7 RR |
323 | /* Called by module remove. */ |
324 | #ifdef CONFIG_SYSFS | |
325 | extern void destroy_params(const struct kernel_param *params, unsigned num); | |
326 | #else | |
327 | static inline void destroy_params(const struct kernel_param *params, | |
328 | unsigned num) | |
329 | { | |
330 | } | |
331 | #endif /* !CONFIG_SYSFS */ | |
332 | ||
1da177e4 LT |
333 | /* All the helper functions */ |
334 | /* The macros to do compile-time type checking stolen from Jakub | |
335 | Jelinek, who IIRC came up with this idea for the 2.4 module init code. */ | |
336 | #define __param_check(name, p, type) \ | |
0283f9a5 | 337 | static inline type __always_unused *__check_##name(void) { return(p); } |
1da177e4 | 338 | |
9c27847d | 339 | extern const struct kernel_param_ops param_ops_byte; |
9bbb9e5a RR |
340 | extern int param_set_byte(const char *val, const struct kernel_param *kp); |
341 | extern int param_get_byte(char *buffer, const struct kernel_param *kp); | |
1da177e4 LT |
342 | #define param_check_byte(name, p) __param_check(name, p, unsigned char) |
343 | ||
9c27847d | 344 | extern const struct kernel_param_ops param_ops_short; |
9bbb9e5a RR |
345 | extern int param_set_short(const char *val, const struct kernel_param *kp); |
346 | extern int param_get_short(char *buffer, const struct kernel_param *kp); | |
1da177e4 LT |
347 | #define param_check_short(name, p) __param_check(name, p, short) |
348 | ||
9c27847d | 349 | extern const struct kernel_param_ops param_ops_ushort; |
9bbb9e5a RR |
350 | extern int param_set_ushort(const char *val, const struct kernel_param *kp); |
351 | extern int param_get_ushort(char *buffer, const struct kernel_param *kp); | |
1da177e4 LT |
352 | #define param_check_ushort(name, p) __param_check(name, p, unsigned short) |
353 | ||
9c27847d | 354 | extern const struct kernel_param_ops param_ops_int; |
9bbb9e5a RR |
355 | extern int param_set_int(const char *val, const struct kernel_param *kp); |
356 | extern int param_get_int(char *buffer, const struct kernel_param *kp); | |
1da177e4 LT |
357 | #define param_check_int(name, p) __param_check(name, p, int) |
358 | ||
9c27847d | 359 | extern const struct kernel_param_ops param_ops_uint; |
9bbb9e5a RR |
360 | extern int param_set_uint(const char *val, const struct kernel_param *kp); |
361 | extern int param_get_uint(char *buffer, const struct kernel_param *kp); | |
1da177e4 LT |
362 | #define param_check_uint(name, p) __param_check(name, p, unsigned int) |
363 | ||
9c27847d | 364 | extern const struct kernel_param_ops param_ops_long; |
9bbb9e5a RR |
365 | extern int param_set_long(const char *val, const struct kernel_param *kp); |
366 | extern int param_get_long(char *buffer, const struct kernel_param *kp); | |
1da177e4 LT |
367 | #define param_check_long(name, p) __param_check(name, p, long) |
368 | ||
9c27847d | 369 | extern const struct kernel_param_ops param_ops_ulong; |
9bbb9e5a RR |
370 | extern int param_set_ulong(const char *val, const struct kernel_param *kp); |
371 | extern int param_get_ulong(char *buffer, const struct kernel_param *kp); | |
1da177e4 LT |
372 | #define param_check_ulong(name, p) __param_check(name, p, unsigned long) |
373 | ||
9c27847d | 374 | extern const struct kernel_param_ops param_ops_ullong; |
b4210b81 HR |
375 | extern int param_set_ullong(const char *val, const struct kernel_param *kp); |
376 | extern int param_get_ullong(char *buffer, const struct kernel_param *kp); | |
377 | #define param_check_ullong(name, p) __param_check(name, p, unsigned long long) | |
378 | ||
9c27847d | 379 | extern const struct kernel_param_ops param_ops_charp; |
9bbb9e5a RR |
380 | extern int param_set_charp(const char *val, const struct kernel_param *kp); |
381 | extern int param_get_charp(char *buffer, const struct kernel_param *kp); | |
3d9c637f | 382 | extern void param_free_charp(void *arg); |
1da177e4 LT |
383 | #define param_check_charp(name, p) __param_check(name, p, char *) |
384 | ||
72db395f | 385 | /* We used to allow int as well as bool. We're taking that away! */ |
9c27847d | 386 | extern const struct kernel_param_ops param_ops_bool; |
9bbb9e5a RR |
387 | extern int param_set_bool(const char *val, const struct kernel_param *kp); |
388 | extern int param_get_bool(char *buffer, const struct kernel_param *kp); | |
72db395f | 389 | #define param_check_bool(name, p) __param_check(name, p, bool) |
1da177e4 | 390 | |
d19f05d8 LR |
391 | extern const struct kernel_param_ops param_ops_bool_enable_only; |
392 | extern int param_set_bool_enable_only(const char *val, | |
393 | const struct kernel_param *kp); | |
394 | /* getter is the same as for the regular bool */ | |
395 | #define param_check_bool_enable_only param_check_bool | |
396 | ||
9c27847d | 397 | extern const struct kernel_param_ops param_ops_invbool; |
9bbb9e5a RR |
398 | extern int param_set_invbool(const char *val, const struct kernel_param *kp); |
399 | extern int param_get_invbool(char *buffer, const struct kernel_param *kp); | |
9a71af2c | 400 | #define param_check_invbool(name, p) __param_check(name, p, bool) |
1da177e4 | 401 | |
69116f27 | 402 | /* An int, which can only be set like a bool (though it shows as an int). */ |
9c27847d | 403 | extern const struct kernel_param_ops param_ops_bint; |
69116f27 RR |
404 | extern int param_set_bint(const char *val, const struct kernel_param *kp); |
405 | #define param_get_bint param_get_int | |
406 | #define param_check_bint param_check_int | |
407 | ||
546970bc RR |
408 | /** |
409 | * module_param_array - a parameter which is an array of some type | |
410 | * @name: the name of the array variable | |
411 | * @type: the type, as per module_param() | |
412 | * @nump: optional pointer filled in with the number written | |
413 | * @perm: visibility in sysfs | |
414 | * | |
415 | * Input and output are as comma-separated values. Commas inside values | |
416 | * don't work properly (eg. an array of charp). | |
417 | * | |
418 | * ARRAY_SIZE(@name) is used to determine the number of elements in the | |
419 | * array, so the definition must be visible. | |
420 | */ | |
421 | #define module_param_array(name, type, nump, perm) \ | |
422 | module_param_array_named(name, name, type, nump, perm) | |
423 | ||
424 | /** | |
425 | * module_param_array_named - renamed parameter which is an array of some type | |
426 | * @name: a valid C identifier which is the parameter name | |
427 | * @array: the name of the array variable | |
428 | * @type: the type, as per module_param() | |
429 | * @nump: optional pointer filled in with the number written | |
430 | * @perm: visibility in sysfs | |
431 | * | |
432 | * This exposes a different name than the actual variable name. See | |
433 | * module_param_named() for why this might be necessary. | |
434 | */ | |
1da177e4 | 435 | #define module_param_array_named(name, array, type, nump, perm) \ |
bafeafea | 436 | param_check_##type(name, &(array)[0]); \ |
22e48eaf | 437 | static const struct kparam_array __param_arr_##name \ |
c5be0b2e RK |
438 | = { .max = ARRAY_SIZE(array), .num = nump, \ |
439 | .ops = ¶m_ops_##type, \ | |
440 | .elemsize = sizeof(array[0]), .elem = array }; \ | |
fddd5201 | 441 | __module_param_call(MODULE_PARAM_PREFIX, name, \ |
9bbb9e5a | 442 | ¶m_array_ops, \ |
fddd5201 | 443 | .arr = &__param_arr_##name, \ |
91f9d330 | 444 | perm, -1, 0); \ |
1da177e4 LT |
445 | __MODULE_PARM_TYPE(name, "array of " #type) |
446 | ||
bf616d21 DH |
447 | enum hwparam_type { |
448 | hwparam_ioport, /* Module parameter configures an I/O port */ | |
449 | hwparam_iomem, /* Module parameter configures an I/O mem address */ | |
450 | hwparam_ioport_or_iomem, /* Module parameter could be either, depending on other option */ | |
401e000a | 451 | hwparam_irq, /* Module parameter configures an IRQ */ |
bf616d21 DH |
452 | hwparam_dma, /* Module parameter configures a DMA channel */ |
453 | hwparam_dma_addr, /* Module parameter configures a DMA buffer address */ | |
454 | hwparam_other, /* Module parameter configures some other value */ | |
455 | }; | |
456 | ||
457 | /** | |
458 | * module_param_hw_named - A parameter representing a hw parameters | |
459 | * @name: a valid C identifier which is the parameter name. | |
460 | * @value: the actual lvalue to alter. | |
461 | * @type: the type of the parameter | |
462 | * @hwtype: what the value represents (enum hwparam_type) | |
463 | * @perm: visibility in sysfs. | |
464 | * | |
465 | * Usually it's a good idea to have variable names and user-exposed names the | |
466 | * same, but that's harder if the variable must be non-static or is inside a | |
467 | * structure. This allows exposure under a different name. | |
468 | */ | |
469 | #define module_param_hw_named(name, value, type, hwtype, perm) \ | |
470 | param_check_##type(name, &(value)); \ | |
471 | __module_param_call(MODULE_PARAM_PREFIX, name, \ | |
472 | ¶m_ops_##type, &value, \ | |
473 | perm, -1, \ | |
474 | KERNEL_PARAM_FL_HWPARAM | (hwparam_##hwtype & 0)); \ | |
475 | __MODULE_PARM_TYPE(name, #type) | |
476 | ||
477 | #define module_param_hw(name, type, hwtype, perm) \ | |
478 | module_param_hw_named(name, name, type, hwtype, perm) | |
479 | ||
480 | /** | |
481 | * module_param_hw_array - A parameter representing an array of hw parameters | |
482 | * @name: the name of the array variable | |
483 | * @type: the type, as per module_param() | |
484 | * @hwtype: what the value represents (enum hwparam_type) | |
485 | * @nump: optional pointer filled in with the number written | |
486 | * @perm: visibility in sysfs | |
487 | * | |
488 | * Input and output are as comma-separated values. Commas inside values | |
489 | * don't work properly (eg. an array of charp). | |
490 | * | |
491 | * ARRAY_SIZE(@name) is used to determine the number of elements in the | |
492 | * array, so the definition must be visible. | |
493 | */ | |
494 | #define module_param_hw_array(name, type, hwtype, nump, perm) \ | |
495 | param_check_##type(name, &(name)[0]); \ | |
496 | static const struct kparam_array __param_arr_##name \ | |
497 | = { .max = ARRAY_SIZE(name), .num = nump, \ | |
498 | .ops = ¶m_ops_##type, \ | |
499 | .elemsize = sizeof(name[0]), .elem = name }; \ | |
500 | __module_param_call(MODULE_PARAM_PREFIX, name, \ | |
501 | ¶m_array_ops, \ | |
502 | .arr = &__param_arr_##name, \ | |
503 | perm, -1, \ | |
504 | KERNEL_PARAM_FL_HWPARAM | (hwparam_##hwtype & 0)); \ | |
505 | __MODULE_PARM_TYPE(name, "array of " #type) | |
506 | ||
507 | ||
9c27847d | 508 | extern const struct kernel_param_ops param_array_ops; |
1da177e4 | 509 | |
9c27847d | 510 | extern const struct kernel_param_ops param_ops_string; |
9bbb9e5a RR |
511 | extern int param_set_copystring(const char *val, const struct kernel_param *); |
512 | extern int param_get_string(char *buffer, const struct kernel_param *kp); | |
1da177e4 | 513 | |
b634d130 | 514 | /* for exporting parameters in /sys/module/.../parameters */ |
1da177e4 LT |
515 | |
516 | struct module; | |
517 | ||
ef665c1a | 518 | #if defined(CONFIG_SYSFS) && defined(CONFIG_MODULES) |
1da177e4 | 519 | extern int module_param_sysfs_setup(struct module *mod, |
9bbb9e5a | 520 | const struct kernel_param *kparam, |
1da177e4 LT |
521 | unsigned int num_params); |
522 | ||
523 | extern void module_param_sysfs_remove(struct module *mod); | |
ef665c1a RD |
524 | #else |
525 | static inline int module_param_sysfs_setup(struct module *mod, | |
9bbb9e5a | 526 | const struct kernel_param *kparam, |
ef665c1a RD |
527 | unsigned int num_params) |
528 | { | |
529 | return 0; | |
530 | } | |
531 | ||
532 | static inline void module_param_sysfs_remove(struct module *mod) | |
533 | { } | |
534 | #endif | |
1da177e4 LT |
535 | |
536 | #endif /* _LINUX_MODULE_PARAMS_H */ |