1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Linux Plug and Play Support
4  * Copyright by Adam Belay <ambx1@neo.rr.com>
5  * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
6  *	Bjorn Helgaas <bjorn.helgaas@hp.com>
7  */
8 
9 #ifndef _LINUX_PNP_H
10 #define _LINUX_PNP_H
11 
12 #include <linux/device.h>
13 #include <linux/list.h>
14 #include <linux/errno.h>
15 #include <linux/mod_devicetable.h>
16 #include <linux/console.h>
17 
18 #define PNP_NAME_LEN		50
19 
20 struct pnp_protocol;
21 struct pnp_dev;
22 
23 /*
24  * Resource Management
25  */
26 #ifdef CONFIG_PNP
27 struct resource *pnp_get_resource(struct pnp_dev *dev, unsigned long type,
28 				unsigned int num);
29 #else
pnp_get_resource(struct pnp_dev * dev,unsigned long type,unsigned int num)30 static inline struct resource *pnp_get_resource(struct pnp_dev *dev,
31 			unsigned long type, unsigned int num)
32 {
33 	return NULL;
34 }
35 #endif
36 
pnp_resource_valid(struct resource * res)37 static inline int pnp_resource_valid(struct resource *res)
38 {
39 	if (res)
40 		return 1;
41 	return 0;
42 }
43 
pnp_resource_enabled(struct resource * res)44 static inline int pnp_resource_enabled(struct resource *res)
45 {
46 	if (res && !(res->flags & IORESOURCE_DISABLED))
47 		return 1;
48 	return 0;
49 }
50 
pnp_resource_len(struct resource * res)51 static inline resource_size_t pnp_resource_len(struct resource *res)
52 {
53 	if (res->start == 0 && res->end == 0)
54 		return 0;
55 	return resource_size(res);
56 }
57 
58 
pnp_port_start(struct pnp_dev * dev,unsigned int bar)59 static inline resource_size_t pnp_port_start(struct pnp_dev *dev,
60 					     unsigned int bar)
61 {
62 	struct resource *res = pnp_get_resource(dev, IORESOURCE_IO, bar);
63 
64 	if (pnp_resource_valid(res))
65 		return res->start;
66 	return 0;
67 }
68 
pnp_port_end(struct pnp_dev * dev,unsigned int bar)69 static inline resource_size_t pnp_port_end(struct pnp_dev *dev,
70 					   unsigned int bar)
71 {
72 	struct resource *res = pnp_get_resource(dev, IORESOURCE_IO, bar);
73 
74 	if (pnp_resource_valid(res))
75 		return res->end;
76 	return 0;
77 }
78 
pnp_port_flags(struct pnp_dev * dev,unsigned int bar)79 static inline unsigned long pnp_port_flags(struct pnp_dev *dev,
80 					   unsigned int bar)
81 {
82 	struct resource *res = pnp_get_resource(dev, IORESOURCE_IO, bar);
83 
84 	if (pnp_resource_valid(res))
85 		return res->flags;
86 	return IORESOURCE_IO | IORESOURCE_AUTO;
87 }
88 
pnp_port_valid(struct pnp_dev * dev,unsigned int bar)89 static inline int pnp_port_valid(struct pnp_dev *dev, unsigned int bar)
90 {
91 	return pnp_resource_valid(pnp_get_resource(dev, IORESOURCE_IO, bar));
92 }
93 
pnp_port_len(struct pnp_dev * dev,unsigned int bar)94 static inline resource_size_t pnp_port_len(struct pnp_dev *dev,
95 					   unsigned int bar)
96 {
97 	struct resource *res = pnp_get_resource(dev, IORESOURCE_IO, bar);
98 
99 	if (pnp_resource_valid(res))
100 		return pnp_resource_len(res);
101 	return 0;
102 }
103 
104 
pnp_mem_start(struct pnp_dev * dev,unsigned int bar)105 static inline resource_size_t pnp_mem_start(struct pnp_dev *dev,
106 					    unsigned int bar)
107 {
108 	struct resource *res = pnp_get_resource(dev, IORESOURCE_MEM, bar);
109 
110 	if (pnp_resource_valid(res))
111 		return res->start;
112 	return 0;
113 }
114 
pnp_mem_end(struct pnp_dev * dev,unsigned int bar)115 static inline resource_size_t pnp_mem_end(struct pnp_dev *dev,
116 					  unsigned int bar)
117 {
118 	struct resource *res = pnp_get_resource(dev, IORESOURCE_MEM, bar);
119 
120 	if (pnp_resource_valid(res))
121 		return res->end;
122 	return 0;
123 }
124 
pnp_mem_flags(struct pnp_dev * dev,unsigned int bar)125 static inline unsigned long pnp_mem_flags(struct pnp_dev *dev, unsigned int bar)
126 {
127 	struct resource *res = pnp_get_resource(dev, IORESOURCE_MEM, bar);
128 
129 	if (pnp_resource_valid(res))
130 		return res->flags;
131 	return IORESOURCE_MEM | IORESOURCE_AUTO;
132 }
133 
pnp_mem_valid(struct pnp_dev * dev,unsigned int bar)134 static inline int pnp_mem_valid(struct pnp_dev *dev, unsigned int bar)
135 {
136 	return pnp_resource_valid(pnp_get_resource(dev, IORESOURCE_MEM, bar));
137 }
138 
pnp_mem_len(struct pnp_dev * dev,unsigned int bar)139 static inline resource_size_t pnp_mem_len(struct pnp_dev *dev,
140 					  unsigned int bar)
141 {
142 	struct resource *res = pnp_get_resource(dev, IORESOURCE_MEM, bar);
143 
144 	if (pnp_resource_valid(res))
145 		return pnp_resource_len(res);
146 	return 0;
147 }
148 
149 
pnp_irq(struct pnp_dev * dev,unsigned int bar)150 static inline resource_size_t pnp_irq(struct pnp_dev *dev, unsigned int bar)
151 {
152 	struct resource *res = pnp_get_resource(dev, IORESOURCE_IRQ, bar);
153 
154 	if (pnp_resource_valid(res))
155 		return res->start;
156 	return -1;
157 }
158 
pnp_irq_flags(struct pnp_dev * dev,unsigned int bar)159 static inline unsigned long pnp_irq_flags(struct pnp_dev *dev, unsigned int bar)
160 {
161 	struct resource *res = pnp_get_resource(dev, IORESOURCE_IRQ, bar);
162 
163 	if (pnp_resource_valid(res))
164 		return res->flags;
165 	return IORESOURCE_IRQ | IORESOURCE_AUTO;
166 }
167 
pnp_irq_valid(struct pnp_dev * dev,unsigned int bar)168 static inline int pnp_irq_valid(struct pnp_dev *dev, unsigned int bar)
169 {
170 	return pnp_resource_valid(pnp_get_resource(dev, IORESOURCE_IRQ, bar));
171 }
172 
173 
pnp_dma(struct pnp_dev * dev,unsigned int bar)174 static inline resource_size_t pnp_dma(struct pnp_dev *dev, unsigned int bar)
175 {
176 	struct resource *res = pnp_get_resource(dev, IORESOURCE_DMA, bar);
177 
178 	if (pnp_resource_valid(res))
179 		return res->start;
180 	return -1;
181 }
182 
pnp_dma_flags(struct pnp_dev * dev,unsigned int bar)183 static inline unsigned long pnp_dma_flags(struct pnp_dev *dev, unsigned int bar)
184 {
185 	struct resource *res = pnp_get_resource(dev, IORESOURCE_DMA, bar);
186 
187 	if (pnp_resource_valid(res))
188 		return res->flags;
189 	return IORESOURCE_DMA | IORESOURCE_AUTO;
190 }
191 
pnp_dma_valid(struct pnp_dev * dev,unsigned int bar)192 static inline int pnp_dma_valid(struct pnp_dev *dev, unsigned int bar)
193 {
194 	return pnp_resource_valid(pnp_get_resource(dev, IORESOURCE_DMA, bar));
195 }
196 
197 
198 /*
199  * Device Management
200  */
201 
202 struct pnp_card {
203 	struct device dev;		/* Driver Model device interface */
204 	unsigned char number;		/* used as an index, must be unique */
205 	struct list_head global_list;	/* node in global list of cards */
206 	struct list_head protocol_list;	/* node in protocol's list of cards */
207 	struct list_head devices;	/* devices attached to the card */
208 
209 	struct pnp_protocol *protocol;
210 	struct pnp_id *id;		/* contains supported EISA IDs */
211 
212 	char name[PNP_NAME_LEN];	/* contains a human-readable name */
213 	unsigned char pnpver;		/* Plug & Play version */
214 	unsigned char productver;	/* product version */
215 	unsigned int serial;		/* serial number */
216 	unsigned char checksum;		/* if zero - checksum passed */
217 	struct proc_dir_entry *procdir;	/* directory entry in /proc/bus/isapnp */
218 };
219 
220 #define global_to_pnp_card(n) list_entry(n, struct pnp_card, global_list)
221 #define protocol_to_pnp_card(n) list_entry(n, struct pnp_card, protocol_list)
222 #define to_pnp_card(n) container_of(n, struct pnp_card, dev)
223 #define pnp_for_each_card(card)	\
224 	list_for_each_entry(card, &pnp_cards, global_list)
225 
226 struct pnp_card_link {
227 	struct pnp_card *card;
228 	struct pnp_card_driver *driver;
229 	void *driver_data;
230 	pm_message_t pm_state;
231 };
232 
pnp_get_card_drvdata(struct pnp_card_link * pcard)233 static inline void *pnp_get_card_drvdata(struct pnp_card_link *pcard)
234 {
235 	return pcard->driver_data;
236 }
237 
pnp_set_card_drvdata(struct pnp_card_link * pcard,void * data)238 static inline void pnp_set_card_drvdata(struct pnp_card_link *pcard, void *data)
239 {
240 	pcard->driver_data = data;
241 }
242 
243 struct pnp_dev {
244 	struct device dev;		/* Driver Model device interface */
245 	u64 dma_mask;
246 	unsigned int number;		/* used as an index, must be unique */
247 	int status;
248 
249 	struct list_head global_list;	/* node in global list of devices */
250 	struct list_head protocol_list;	/* node in list of device's protocol */
251 	struct list_head card_list;	/* node in card's list of devices */
252 	struct list_head rdev_list;	/* node in cards list of requested devices */
253 
254 	struct pnp_protocol *protocol;
255 	struct pnp_card *card;	/* card the device is attached to, none if NULL */
256 	struct pnp_driver *driver;
257 	struct pnp_card_link *card_link;
258 
259 	struct pnp_id *id;		/* supported EISA IDs */
260 
261 	int active;
262 	int capabilities;
263 	unsigned int num_dependent_sets;
264 	struct list_head resources;
265 	struct list_head options;
266 
267 	char name[PNP_NAME_LEN];	/* contains a human-readable name */
268 	int flags;			/* used by protocols */
269 	struct proc_dir_entry *procent;	/* device entry in /proc/bus/isapnp */
270 	void *data;
271 };
272 
273 #define global_to_pnp_dev(n) list_entry(n, struct pnp_dev, global_list)
274 #define card_to_pnp_dev(n) list_entry(n, struct pnp_dev, card_list)
275 #define protocol_to_pnp_dev(n) list_entry(n, struct pnp_dev, protocol_list)
276 #define	to_pnp_dev(n) container_of(n, struct pnp_dev, dev)
277 #define pnp_for_each_dev(dev) list_for_each_entry(dev, &pnp_global, global_list)
278 #define card_for_each_dev(card, dev)	\
279 	list_for_each_entry(dev, &(card)->devices, card_list)
280 #define pnp_dev_name(dev) (dev)->name
281 
pnp_get_drvdata(struct pnp_dev * pdev)282 static inline void *pnp_get_drvdata(struct pnp_dev *pdev)
283 {
284 	return dev_get_drvdata(&pdev->dev);
285 }
286 
pnp_set_drvdata(struct pnp_dev * pdev,void * data)287 static inline void pnp_set_drvdata(struct pnp_dev *pdev, void *data)
288 {
289 	dev_set_drvdata(&pdev->dev, data);
290 }
291 
292 struct pnp_fixup {
293 	char id[7];
294 	void (*quirk_function) (struct pnp_dev * dev);	/* fixup function */
295 };
296 
297 /* config parameters */
298 #define PNP_CONFIG_NORMAL	0x0001
299 #define PNP_CONFIG_FORCE	0x0002	/* disables validity checking */
300 
301 /* capabilities */
302 #define PNP_READ		0x0001
303 #define PNP_WRITE		0x0002
304 #define PNP_DISABLE		0x0004
305 #define PNP_CONFIGURABLE	0x0008
306 #define PNP_REMOVABLE		0x0010
307 #define PNP_CONSOLE		0x0020
308 
309 #define pnp_can_read(dev)	(((dev)->protocol->get) && \
310 				 ((dev)->capabilities & PNP_READ))
311 #define pnp_can_write(dev)	(((dev)->protocol->set) && \
312 				 ((dev)->capabilities & PNP_WRITE))
313 #define pnp_can_disable(dev)	(((dev)->protocol->disable) &&		  \
314 				 ((dev)->capabilities & PNP_DISABLE) &&	  \
315 				 (!((dev)->capabilities & PNP_CONSOLE) || \
316 				  console_suspend_enabled))
317 #define pnp_can_configure(dev)	((!(dev)->active) && \
318 				 ((dev)->capabilities & PNP_CONFIGURABLE))
319 #define pnp_can_suspend(dev)	(((dev)->protocol->suspend) &&		  \
320 				 (!((dev)->capabilities & PNP_CONSOLE) || \
321 				  console_suspend_enabled))
322 
323 
324 #ifdef CONFIG_ISAPNP
325 extern struct pnp_protocol isapnp_protocol;
326 #define pnp_device_is_isapnp(dev) ((dev)->protocol == (&isapnp_protocol))
327 #else
328 #define pnp_device_is_isapnp(dev) 0
329 #endif
330 extern struct mutex pnp_res_mutex;
331 
332 #ifdef CONFIG_PNPBIOS
333 extern struct pnp_protocol pnpbios_protocol;
334 extern bool arch_pnpbios_disabled(void);
335 #define pnp_device_is_pnpbios(dev) ((dev)->protocol == (&pnpbios_protocol))
336 #else
337 #define pnp_device_is_pnpbios(dev) 0
338 #define arch_pnpbios_disabled()	false
339 #endif
340 
341 #ifdef CONFIG_PNPACPI
342 extern struct pnp_protocol pnpacpi_protocol;
343 
pnp_acpi_device(struct pnp_dev * dev)344 static inline struct acpi_device *pnp_acpi_device(struct pnp_dev *dev)
345 {
346 	if (dev->protocol == &pnpacpi_protocol)
347 		return dev->data;
348 	return NULL;
349 }
350 #else
351 #define pnp_acpi_device(dev) 0
352 #endif
353 
354 /* status */
355 #define PNP_READY		0x0000
356 #define PNP_ATTACHED		0x0001
357 #define PNP_BUSY		0x0002
358 #define PNP_FAULTY		0x0004
359 
360 /* isapnp specific macros */
361 
362 #define isapnp_card_number(dev)	((dev)->card ? (dev)->card->number : -1)
363 #define isapnp_csn_number(dev)  ((dev)->number)
364 
365 /*
366  * Driver Management
367  */
368 
369 struct pnp_id {
370 	char id[PNP_ID_LEN];
371 	struct pnp_id *next;
372 };
373 
374 struct pnp_driver {
375 	char *name;
376 	const struct pnp_device_id *id_table;
377 	unsigned int flags;
378 	int (*probe) (struct pnp_dev *dev, const struct pnp_device_id *dev_id);
379 	void (*remove) (struct pnp_dev *dev);
380 	void (*shutdown) (struct pnp_dev *dev);
381 	int (*suspend) (struct pnp_dev *dev, pm_message_t state);
382 	int (*resume) (struct pnp_dev *dev);
383 	struct device_driver driver;
384 };
385 
386 #define	to_pnp_driver(drv) container_of(drv, struct pnp_driver, driver)
387 
388 struct pnp_card_driver {
389 	struct list_head global_list;
390 	char *name;
391 	const struct pnp_card_device_id *id_table;
392 	unsigned int flags;
393 	int (*probe) (struct pnp_card_link *card,
394 		      const struct pnp_card_device_id *card_id);
395 	void (*remove) (struct pnp_card_link *card);
396 	int (*suspend) (struct pnp_card_link *card, pm_message_t state);
397 	int (*resume) (struct pnp_card_link *card);
398 	struct pnp_driver link;
399 };
400 
401 #define	to_pnp_card_driver(drv) container_of(drv, struct pnp_card_driver, link)
402 
403 /* pnp driver flags */
404 #define PNP_DRIVER_RES_DO_NOT_CHANGE	0x0001	/* do not change the state of the device */
405 #define PNP_DRIVER_RES_DISABLE		0x0003	/* ensure the device is disabled */
406 
407 /*
408  * Protocol Management
409  */
410 
411 struct pnp_protocol {
412 	struct list_head protocol_list;
413 	char *name;
414 
415 	/* resource control functions */
416 	int (*get) (struct pnp_dev *dev);
417 	int (*set) (struct pnp_dev *dev);
418 	int (*disable) (struct pnp_dev *dev);
419 
420 	/* protocol specific suspend/resume */
421 	bool (*can_wakeup) (struct pnp_dev *dev);
422 	int (*suspend) (struct pnp_dev * dev, pm_message_t state);
423 	int (*resume) (struct pnp_dev * dev);
424 
425 	/* used by pnp layer only (look but don't touch) */
426 	unsigned char number;	/* protocol number */
427 	struct device dev;	/* link to driver model */
428 	struct list_head cards;
429 	struct list_head devices;
430 };
431 
432 #define to_pnp_protocol(n) list_entry(n, struct pnp_protocol, protocol_list)
433 #define protocol_for_each_card(protocol, card)	\
434 	list_for_each_entry(card, &(protocol)->cards, protocol_list)
435 #define protocol_for_each_dev(protocol, dev)	\
436 	list_for_each_entry(dev, &(protocol)->devices, protocol_list)
437 
438 extern struct bus_type pnp_bus_type;
439 
440 #if defined(CONFIG_PNP)
441 
442 /* device management */
443 int pnp_device_attach(struct pnp_dev *pnp_dev);
444 void pnp_device_detach(struct pnp_dev *pnp_dev);
445 extern struct list_head pnp_global;
446 extern int pnp_platform_devices;
447 
448 /* multidevice card support */
449 struct pnp_dev *pnp_request_card_device(struct pnp_card_link *clink,
450 					const char *id, struct pnp_dev *from);
451 void pnp_release_card_device(struct pnp_dev *dev);
452 int pnp_register_card_driver(struct pnp_card_driver *drv);
453 void pnp_unregister_card_driver(struct pnp_card_driver *drv);
454 extern struct list_head pnp_cards;
455 
456 /* resource management */
457 int pnp_possible_config(struct pnp_dev *dev, int type, resource_size_t base,
458 			resource_size_t size);
459 int pnp_auto_config_dev(struct pnp_dev *dev);
460 int pnp_start_dev(struct pnp_dev *dev);
461 int pnp_stop_dev(struct pnp_dev *dev);
462 int pnp_activate_dev(struct pnp_dev *dev);
463 int pnp_disable_dev(struct pnp_dev *dev);
464 int pnp_range_reserved(resource_size_t start, resource_size_t end);
465 
466 /* protocol helpers */
467 int pnp_is_active(struct pnp_dev *dev);
468 int compare_pnp_id(struct pnp_id *pos, const char *id);
469 int pnp_register_driver(struct pnp_driver *drv);
470 void pnp_unregister_driver(struct pnp_driver *drv);
471 
472 #else
473 
474 /* device management */
pnp_device_attach(struct pnp_dev * pnp_dev)475 static inline int pnp_device_attach(struct pnp_dev *pnp_dev) { return -ENODEV; }
pnp_device_detach(struct pnp_dev * pnp_dev)476 static inline void pnp_device_detach(struct pnp_dev *pnp_dev) { }
477 
478 #define pnp_platform_devices 0
479 
480 /* multidevice card support */
pnp_request_card_device(struct pnp_card_link * clink,const char * id,struct pnp_dev * from)481 static inline struct pnp_dev *pnp_request_card_device(struct pnp_card_link *clink, const char *id, struct pnp_dev *from) { return NULL; }
pnp_release_card_device(struct pnp_dev * dev)482 static inline void pnp_release_card_device(struct pnp_dev *dev) { }
pnp_register_card_driver(struct pnp_card_driver * drv)483 static inline int pnp_register_card_driver(struct pnp_card_driver *drv) { return -ENODEV; }
pnp_unregister_card_driver(struct pnp_card_driver * drv)484 static inline void pnp_unregister_card_driver(struct pnp_card_driver *drv) { }
485 
486 /* resource management */
pnp_possible_config(struct pnp_dev * dev,int type,resource_size_t base,resource_size_t size)487 static inline int pnp_possible_config(struct pnp_dev *dev, int type,
488 				      resource_size_t base,
489 				      resource_size_t size) { return 0; }
pnp_auto_config_dev(struct pnp_dev * dev)490 static inline int pnp_auto_config_dev(struct pnp_dev *dev) { return -ENODEV; }
pnp_start_dev(struct pnp_dev * dev)491 static inline int pnp_start_dev(struct pnp_dev *dev) { return -ENODEV; }
pnp_stop_dev(struct pnp_dev * dev)492 static inline int pnp_stop_dev(struct pnp_dev *dev) { return -ENODEV; }
pnp_activate_dev(struct pnp_dev * dev)493 static inline int pnp_activate_dev(struct pnp_dev *dev) { return -ENODEV; }
pnp_disable_dev(struct pnp_dev * dev)494 static inline int pnp_disable_dev(struct pnp_dev *dev) { return -ENODEV; }
pnp_range_reserved(resource_size_t start,resource_size_t end)495 static inline int pnp_range_reserved(resource_size_t start, resource_size_t end) { return 0;}
496 
497 /* protocol helpers */
pnp_is_active(struct pnp_dev * dev)498 static inline int pnp_is_active(struct pnp_dev *dev) { return 0; }
compare_pnp_id(struct pnp_id * pos,const char * id)499 static inline int compare_pnp_id(struct pnp_id *pos, const char *id) { return -ENODEV; }
pnp_register_driver(struct pnp_driver * drv)500 static inline int pnp_register_driver(struct pnp_driver *drv) { return -ENODEV; }
pnp_unregister_driver(struct pnp_driver * drv)501 static inline void pnp_unregister_driver(struct pnp_driver *drv) { }
502 
503 #endif /* CONFIG_PNP */
504 
505 /**
506  * module_pnp_driver() - Helper macro for registering a PnP driver
507  * @__pnp_driver: pnp_driver struct
508  *
509  * Helper macro for PnP drivers which do not do anything special in module
510  * init/exit. This eliminates a lot of boilerplate. Each module may only
511  * use this macro once, and calling it replaces module_init() and module_exit()
512  */
513 #define module_pnp_driver(__pnp_driver) \
514 	module_driver(__pnp_driver, pnp_register_driver, \
515 				    pnp_unregister_driver)
516 
517 #endif /* _LINUX_PNP_H */
518