Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * manager.c - Resource Management, Conflict Resolution, Activation and Disabling of Devices | |
3 | * | |
4 | * based on isapnp.c resource management (c) Jaroslav Kysela <perex@suse.cz> | |
5 | * Copyright 2003 Adam Belay <ambx1@neo.rr.com> | |
1da177e4 LT |
6 | */ |
7 | ||
1da177e4 LT |
8 | #include <linux/errno.h> |
9 | #include <linux/module.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/kernel.h> | |
1da177e4 | 12 | #include <linux/pnp.h> |
4e57b681 TS |
13 | #include <linux/slab.h> |
14 | #include <linux/bitmap.h> | |
1da177e4 LT |
15 | #include "base.h" |
16 | ||
17 | DECLARE_MUTEX(pnp_res_mutex); | |
18 | ||
19 | static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx) | |
20 | { | |
b60ba834 GKH |
21 | resource_size_t *start, *end; |
22 | unsigned long *flags; | |
1da177e4 LT |
23 | |
24 | if (!dev || !rule) | |
25 | return -EINVAL; | |
26 | ||
27 | if (idx >= PNP_MAX_PORT) { | |
9dd78466 BH |
28 | pnp_err |
29 | ("More than 4 ports is incompatible with pnp specifications."); | |
1da177e4 LT |
30 | /* pretend we were successful so at least the manager won't try again */ |
31 | return 1; | |
32 | } | |
33 | ||
34 | /* check if this resource has been manually set, if so skip */ | |
35 | if (!(dev->res.port_resource[idx].flags & IORESOURCE_AUTO)) | |
36 | return 1; | |
37 | ||
38 | start = &dev->res.port_resource[idx].start; | |
39 | end = &dev->res.port_resource[idx].end; | |
40 | flags = &dev->res.port_resource[idx].flags; | |
41 | ||
42 | /* set the initial values */ | |
43 | *flags |= rule->flags | IORESOURCE_IO; | |
9dd78466 | 44 | *flags &= ~IORESOURCE_UNSET; |
1da177e4 LT |
45 | |
46 | if (!rule->size) { | |
47 | *flags |= IORESOURCE_DISABLED; | |
9dd78466 | 48 | return 1; /* skip disabled resource requests */ |
1da177e4 LT |
49 | } |
50 | ||
51 | *start = rule->min; | |
52 | *end = *start + rule->size - 1; | |
53 | ||
54 | /* run through until pnp_check_port is happy */ | |
55 | while (!pnp_check_port(dev, idx)) { | |
56 | *start += rule->align; | |
57 | *end = *start + rule->size - 1; | |
58 | if (*start > rule->max || !rule->align) | |
59 | return 0; | |
60 | } | |
61 | return 1; | |
62 | } | |
63 | ||
64 | static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx) | |
65 | { | |
b60ba834 GKH |
66 | resource_size_t *start, *end; |
67 | unsigned long *flags; | |
1da177e4 LT |
68 | |
69 | if (!dev || !rule) | |
70 | return -EINVAL; | |
71 | ||
72 | if (idx >= PNP_MAX_MEM) { | |
9dd78466 BH |
73 | pnp_err |
74 | ("More than 8 mems is incompatible with pnp specifications."); | |
1da177e4 LT |
75 | /* pretend we were successful so at least the manager won't try again */ |
76 | return 1; | |
77 | } | |
78 | ||
79 | /* check if this resource has been manually set, if so skip */ | |
80 | if (!(dev->res.mem_resource[idx].flags & IORESOURCE_AUTO)) | |
81 | return 1; | |
82 | ||
83 | start = &dev->res.mem_resource[idx].start; | |
84 | end = &dev->res.mem_resource[idx].end; | |
85 | flags = &dev->res.mem_resource[idx].flags; | |
86 | ||
87 | /* set the initial values */ | |
88 | *flags |= rule->flags | IORESOURCE_MEM; | |
9dd78466 | 89 | *flags &= ~IORESOURCE_UNSET; |
1da177e4 LT |
90 | |
91 | /* convert pnp flags to standard Linux flags */ | |
92 | if (!(rule->flags & IORESOURCE_MEM_WRITEABLE)) | |
93 | *flags |= IORESOURCE_READONLY; | |
94 | if (rule->flags & IORESOURCE_MEM_CACHEABLE) | |
95 | *flags |= IORESOURCE_CACHEABLE; | |
96 | if (rule->flags & IORESOURCE_MEM_RANGELENGTH) | |
97 | *flags |= IORESOURCE_RANGELENGTH; | |
98 | if (rule->flags & IORESOURCE_MEM_SHADOWABLE) | |
99 | *flags |= IORESOURCE_SHADOWABLE; | |
100 | ||
101 | if (!rule->size) { | |
102 | *flags |= IORESOURCE_DISABLED; | |
9dd78466 | 103 | return 1; /* skip disabled resource requests */ |
1da177e4 LT |
104 | } |
105 | ||
106 | *start = rule->min; | |
9dd78466 | 107 | *end = *start + rule->size - 1; |
1da177e4 LT |
108 | |
109 | /* run through until pnp_check_mem is happy */ | |
110 | while (!pnp_check_mem(dev, idx)) { | |
111 | *start += rule->align; | |
112 | *end = *start + rule->size - 1; | |
113 | if (*start > rule->max || !rule->align) | |
114 | return 0; | |
115 | } | |
116 | return 1; | |
117 | } | |
118 | ||
9dd78466 | 119 | static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx) |
1da177e4 | 120 | { |
b60ba834 GKH |
121 | resource_size_t *start, *end; |
122 | unsigned long *flags; | |
1da177e4 LT |
123 | int i; |
124 | ||
125 | /* IRQ priority: this table is good for i386 */ | |
126 | static unsigned short xtab[16] = { | |
127 | 5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2 | |
128 | }; | |
129 | ||
130 | if (!dev || !rule) | |
131 | return -EINVAL; | |
132 | ||
133 | if (idx >= PNP_MAX_IRQ) { | |
9dd78466 BH |
134 | pnp_err |
135 | ("More than 2 irqs is incompatible with pnp specifications."); | |
1da177e4 LT |
136 | /* pretend we were successful so at least the manager won't try again */ |
137 | return 1; | |
138 | } | |
139 | ||
140 | /* check if this resource has been manually set, if so skip */ | |
141 | if (!(dev->res.irq_resource[idx].flags & IORESOURCE_AUTO)) | |
142 | return 1; | |
143 | ||
144 | start = &dev->res.irq_resource[idx].start; | |
145 | end = &dev->res.irq_resource[idx].end; | |
146 | flags = &dev->res.irq_resource[idx].flags; | |
147 | ||
148 | /* set the initial values */ | |
149 | *flags |= rule->flags | IORESOURCE_IRQ; | |
9dd78466 | 150 | *flags &= ~IORESOURCE_UNSET; |
1da177e4 LT |
151 | |
152 | if (bitmap_empty(rule->map, PNP_IRQ_NR)) { | |
153 | *flags |= IORESOURCE_DISABLED; | |
9dd78466 | 154 | return 1; /* skip disabled resource requests */ |
1da177e4 LT |
155 | } |
156 | ||
157 | /* TBD: need check for >16 IRQ */ | |
158 | *start = find_next_bit(rule->map, PNP_IRQ_NR, 16); | |
159 | if (*start < PNP_IRQ_NR) { | |
160 | *end = *start; | |
161 | return 1; | |
162 | } | |
163 | for (i = 0; i < 16; i++) { | |
9dd78466 | 164 | if (test_bit(xtab[i], rule->map)) { |
1da177e4 | 165 | *start = *end = xtab[i]; |
9dd78466 | 166 | if (pnp_check_irq(dev, idx)) |
1da177e4 LT |
167 | return 1; |
168 | } | |
169 | } | |
170 | return 0; | |
171 | } | |
172 | ||
173 | static int pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx) | |
174 | { | |
b60ba834 GKH |
175 | resource_size_t *start, *end; |
176 | unsigned long *flags; | |
1da177e4 LT |
177 | int i; |
178 | ||
179 | /* DMA priority: this table is good for i386 */ | |
180 | static unsigned short xtab[8] = { | |
181 | 1, 3, 5, 6, 7, 0, 2, 4 | |
182 | }; | |
183 | ||
184 | if (!dev || !rule) | |
185 | return -EINVAL; | |
186 | ||
187 | if (idx >= PNP_MAX_DMA) { | |
9dd78466 BH |
188 | pnp_err |
189 | ("More than 2 dmas is incompatible with pnp specifications."); | |
1da177e4 LT |
190 | /* pretend we were successful so at least the manager won't try again */ |
191 | return 1; | |
192 | } | |
193 | ||
194 | /* check if this resource has been manually set, if so skip */ | |
195 | if (!(dev->res.dma_resource[idx].flags & IORESOURCE_AUTO)) | |
196 | return 1; | |
197 | ||
198 | start = &dev->res.dma_resource[idx].start; | |
199 | end = &dev->res.dma_resource[idx].end; | |
200 | flags = &dev->res.dma_resource[idx].flags; | |
201 | ||
202 | /* set the initial values */ | |
203 | *flags |= rule->flags | IORESOURCE_DMA; | |
9dd78466 | 204 | *flags &= ~IORESOURCE_UNSET; |
1da177e4 LT |
205 | |
206 | if (!rule->map) { | |
207 | *flags |= IORESOURCE_DISABLED; | |
9dd78466 | 208 | return 1; /* skip disabled resource requests */ |
1da177e4 LT |
209 | } |
210 | ||
211 | for (i = 0; i < 8; i++) { | |
9dd78466 | 212 | if (rule->map & (1 << xtab[i])) { |
1da177e4 | 213 | *start = *end = xtab[i]; |
9dd78466 | 214 | if (pnp_check_dma(dev, idx)) |
1da177e4 LT |
215 | return 1; |
216 | } | |
217 | } | |
218 | return 0; | |
219 | } | |
220 | ||
221 | /** | |
222 | * pnp_init_resources - Resets a resource table to default values. | |
223 | * @table: pointer to the desired resource table | |
1da177e4 LT |
224 | */ |
225 | void pnp_init_resource_table(struct pnp_resource_table *table) | |
226 | { | |
227 | int idx; | |
07d4e9af | 228 | |
1da177e4 LT |
229 | for (idx = 0; idx < PNP_MAX_IRQ; idx++) { |
230 | table->irq_resource[idx].name = NULL; | |
231 | table->irq_resource[idx].start = -1; | |
232 | table->irq_resource[idx].end = -1; | |
9dd78466 BH |
233 | table->irq_resource[idx].flags = |
234 | IORESOURCE_IRQ | IORESOURCE_AUTO | IORESOURCE_UNSET; | |
1da177e4 LT |
235 | } |
236 | for (idx = 0; idx < PNP_MAX_DMA; idx++) { | |
237 | table->dma_resource[idx].name = NULL; | |
238 | table->dma_resource[idx].start = -1; | |
239 | table->dma_resource[idx].end = -1; | |
9dd78466 BH |
240 | table->dma_resource[idx].flags = |
241 | IORESOURCE_DMA | IORESOURCE_AUTO | IORESOURCE_UNSET; | |
1da177e4 LT |
242 | } |
243 | for (idx = 0; idx < PNP_MAX_PORT; idx++) { | |
244 | table->port_resource[idx].name = NULL; | |
245 | table->port_resource[idx].start = 0; | |
246 | table->port_resource[idx].end = 0; | |
9dd78466 BH |
247 | table->port_resource[idx].flags = |
248 | IORESOURCE_IO | IORESOURCE_AUTO | IORESOURCE_UNSET; | |
1da177e4 LT |
249 | } |
250 | for (idx = 0; idx < PNP_MAX_MEM; idx++) { | |
251 | table->mem_resource[idx].name = NULL; | |
252 | table->mem_resource[idx].start = 0; | |
253 | table->mem_resource[idx].end = 0; | |
9dd78466 BH |
254 | table->mem_resource[idx].flags = |
255 | IORESOURCE_MEM | IORESOURCE_AUTO | IORESOURCE_UNSET; | |
1da177e4 LT |
256 | } |
257 | } | |
258 | ||
259 | /** | |
260 | * pnp_clean_resources - clears resources that were not manually set | |
67be2dd1 | 261 | * @res: the resources to clean |
1da177e4 | 262 | */ |
9dd78466 | 263 | static void pnp_clean_resource_table(struct pnp_resource_table *res) |
1da177e4 LT |
264 | { |
265 | int idx; | |
07d4e9af | 266 | |
1da177e4 LT |
267 | for (idx = 0; idx < PNP_MAX_IRQ; idx++) { |
268 | if (!(res->irq_resource[idx].flags & IORESOURCE_AUTO)) | |
269 | continue; | |
270 | res->irq_resource[idx].start = -1; | |
271 | res->irq_resource[idx].end = -1; | |
9dd78466 BH |
272 | res->irq_resource[idx].flags = |
273 | IORESOURCE_IRQ | IORESOURCE_AUTO | IORESOURCE_UNSET; | |
1da177e4 LT |
274 | } |
275 | for (idx = 0; idx < PNP_MAX_DMA; idx++) { | |
276 | if (!(res->dma_resource[idx].flags & IORESOURCE_AUTO)) | |
277 | continue; | |
278 | res->dma_resource[idx].start = -1; | |
279 | res->dma_resource[idx].end = -1; | |
9dd78466 BH |
280 | res->dma_resource[idx].flags = |
281 | IORESOURCE_DMA | IORESOURCE_AUTO | IORESOURCE_UNSET; | |
1da177e4 LT |
282 | } |
283 | for (idx = 0; idx < PNP_MAX_PORT; idx++) { | |
284 | if (!(res->port_resource[idx].flags & IORESOURCE_AUTO)) | |
285 | continue; | |
286 | res->port_resource[idx].start = 0; | |
287 | res->port_resource[idx].end = 0; | |
9dd78466 BH |
288 | res->port_resource[idx].flags = |
289 | IORESOURCE_IO | IORESOURCE_AUTO | IORESOURCE_UNSET; | |
1da177e4 LT |
290 | } |
291 | for (idx = 0; idx < PNP_MAX_MEM; idx++) { | |
292 | if (!(res->mem_resource[idx].flags & IORESOURCE_AUTO)) | |
293 | continue; | |
294 | res->mem_resource[idx].start = 0; | |
295 | res->mem_resource[idx].end = 0; | |
9dd78466 BH |
296 | res->mem_resource[idx].flags = |
297 | IORESOURCE_MEM | IORESOURCE_AUTO | IORESOURCE_UNSET; | |
1da177e4 LT |
298 | } |
299 | } | |
300 | ||
301 | /** | |
302 | * pnp_assign_resources - assigns resources to the device based on the specified dependent number | |
303 | * @dev: pointer to the desired device | |
304 | * @depnum: the dependent function number | |
305 | * | |
306 | * Only set depnum to 0 if the device does not have dependent options. | |
307 | */ | |
308 | static int pnp_assign_resources(struct pnp_dev *dev, int depnum) | |
309 | { | |
310 | struct pnp_port *port; | |
311 | struct pnp_mem *mem; | |
312 | struct pnp_irq *irq; | |
313 | struct pnp_dma *dma; | |
314 | int nport = 0, nmem = 0, nirq = 0, ndma = 0; | |
315 | ||
316 | if (!pnp_can_configure(dev)) | |
317 | return -ENODEV; | |
318 | ||
319 | down(&pnp_res_mutex); | |
9dd78466 | 320 | pnp_clean_resource_table(&dev->res); /* start with a fresh slate */ |
1da177e4 LT |
321 | if (dev->independent) { |
322 | port = dev->independent->port; | |
323 | mem = dev->independent->mem; | |
324 | irq = dev->independent->irq; | |
325 | dma = dev->independent->dma; | |
326 | while (port) { | |
327 | if (!pnp_assign_port(dev, port, nport)) | |
328 | goto fail; | |
329 | nport++; | |
330 | port = port->next; | |
331 | } | |
332 | while (mem) { | |
333 | if (!pnp_assign_mem(dev, mem, nmem)) | |
334 | goto fail; | |
335 | nmem++; | |
336 | mem = mem->next; | |
337 | } | |
338 | while (irq) { | |
339 | if (!pnp_assign_irq(dev, irq, nirq)) | |
340 | goto fail; | |
341 | nirq++; | |
342 | irq = irq->next; | |
343 | } | |
344 | while (dma) { | |
345 | if (!pnp_assign_dma(dev, dma, ndma)) | |
346 | goto fail; | |
347 | ndma++; | |
348 | dma = dma->next; | |
349 | } | |
350 | } | |
351 | ||
352 | if (depnum) { | |
353 | struct pnp_option *dep; | |
354 | int i; | |
9dd78466 BH |
355 | for (i = 1, dep = dev->dependent; i < depnum; |
356 | i++, dep = dep->next) | |
357 | if (!dep) | |
1da177e4 | 358 | goto fail; |
9dd78466 | 359 | port = dep->port; |
1da177e4 LT |
360 | mem = dep->mem; |
361 | irq = dep->irq; | |
362 | dma = dep->dma; | |
363 | while (port) { | |
364 | if (!pnp_assign_port(dev, port, nport)) | |
365 | goto fail; | |
366 | nport++; | |
367 | port = port->next; | |
368 | } | |
369 | while (mem) { | |
370 | if (!pnp_assign_mem(dev, mem, nmem)) | |
371 | goto fail; | |
372 | nmem++; | |
373 | mem = mem->next; | |
374 | } | |
375 | while (irq) { | |
376 | if (!pnp_assign_irq(dev, irq, nirq)) | |
377 | goto fail; | |
378 | nirq++; | |
379 | irq = irq->next; | |
380 | } | |
381 | while (dma) { | |
382 | if (!pnp_assign_dma(dev, dma, ndma)) | |
383 | goto fail; | |
384 | ndma++; | |
385 | dma = dma->next; | |
386 | } | |
387 | } else if (dev->dependent) | |
388 | goto fail; | |
389 | ||
390 | up(&pnp_res_mutex); | |
391 | return 1; | |
392 | ||
9dd78466 | 393 | fail: |
1da177e4 LT |
394 | pnp_clean_resource_table(&dev->res); |
395 | up(&pnp_res_mutex); | |
396 | return 0; | |
397 | } | |
398 | ||
399 | /** | |
400 | * pnp_manual_config_dev - Disables Auto Config and Manually sets the resource table | |
401 | * @dev: pointer to the desired device | |
402 | * @res: pointer to the new resource config | |
3d41088f | 403 | * @mode: 0 or PNP_CONFIG_FORCE |
1da177e4 LT |
404 | * |
405 | * This function can be used by drivers that want to manually set thier resources. | |
406 | */ | |
9dd78466 BH |
407 | int pnp_manual_config_dev(struct pnp_dev *dev, struct pnp_resource_table *res, |
408 | int mode) | |
1da177e4 LT |
409 | { |
410 | int i; | |
9dd78466 | 411 | struct pnp_resource_table *bak; |
07d4e9af | 412 | |
1da177e4 LT |
413 | if (!dev || !res) |
414 | return -EINVAL; | |
415 | if (!pnp_can_configure(dev)) | |
416 | return -ENODEV; | |
417 | bak = pnp_alloc(sizeof(struct pnp_resource_table)); | |
418 | if (!bak) | |
419 | return -ENOMEM; | |
420 | *bak = dev->res; | |
421 | ||
422 | down(&pnp_res_mutex); | |
423 | dev->res = *res; | |
424 | if (!(mode & PNP_CONFIG_FORCE)) { | |
425 | for (i = 0; i < PNP_MAX_PORT; i++) { | |
9dd78466 | 426 | if (!pnp_check_port(dev, i)) |
1da177e4 LT |
427 | goto fail; |
428 | } | |
429 | for (i = 0; i < PNP_MAX_MEM; i++) { | |
9dd78466 | 430 | if (!pnp_check_mem(dev, i)) |
1da177e4 LT |
431 | goto fail; |
432 | } | |
433 | for (i = 0; i < PNP_MAX_IRQ; i++) { | |
9dd78466 | 434 | if (!pnp_check_irq(dev, i)) |
1da177e4 LT |
435 | goto fail; |
436 | } | |
437 | for (i = 0; i < PNP_MAX_DMA; i++) { | |
9dd78466 | 438 | if (!pnp_check_dma(dev, i)) |
1da177e4 LT |
439 | goto fail; |
440 | } | |
441 | } | |
442 | up(&pnp_res_mutex); | |
443 | ||
444 | kfree(bak); | |
445 | return 0; | |
446 | ||
9dd78466 | 447 | fail: |
1da177e4 LT |
448 | dev->res = *bak; |
449 | up(&pnp_res_mutex); | |
450 | kfree(bak); | |
451 | return -EINVAL; | |
452 | } | |
453 | ||
454 | /** | |
455 | * pnp_auto_config_dev - automatically assigns resources to a device | |
456 | * @dev: pointer to the desired device | |
1da177e4 LT |
457 | */ |
458 | int pnp_auto_config_dev(struct pnp_dev *dev) | |
459 | { | |
460 | struct pnp_option *dep; | |
461 | int i = 1; | |
462 | ||
9dd78466 | 463 | if (!dev) |
1da177e4 LT |
464 | return -EINVAL; |
465 | ||
9dd78466 BH |
466 | if (!pnp_can_configure(dev)) { |
467 | pnp_dbg("Device %s does not support resource configuration.", | |
468 | dev->dev.bus_id); | |
1da177e4 LT |
469 | return -ENODEV; |
470 | } | |
471 | ||
472 | if (!dev->dependent) { | |
473 | if (pnp_assign_resources(dev, 0)) | |
474 | return 0; | |
475 | } else { | |
476 | dep = dev->dependent; | |
477 | do { | |
478 | if (pnp_assign_resources(dev, i)) | |
479 | return 0; | |
480 | dep = dep->next; | |
481 | i++; | |
482 | } while (dep); | |
483 | } | |
484 | ||
485 | pnp_err("Unable to assign resources to device %s.", dev->dev.bus_id); | |
486 | return -EBUSY; | |
487 | } | |
488 | ||
68094e32 PO |
489 | /** |
490 | * pnp_start_dev - low-level start of the PnP device | |
491 | * @dev: pointer to the desired device | |
492 | * | |
07d4e9af | 493 | * assumes that resources have already been allocated |
68094e32 | 494 | */ |
68094e32 PO |
495 | int pnp_start_dev(struct pnp_dev *dev) |
496 | { | |
497 | if (!pnp_can_write(dev)) { | |
9dd78466 BH |
498 | pnp_dbg("Device %s does not support activation.", |
499 | dev->dev.bus_id); | |
68094e32 PO |
500 | return -EINVAL; |
501 | } | |
502 | ||
9dd78466 | 503 | if (dev->protocol->set(dev, &dev->res) < 0) { |
68094e32 PO |
504 | pnp_err("Failed to activate device %s.", dev->dev.bus_id); |
505 | return -EIO; | |
506 | } | |
507 | ||
508 | pnp_info("Device %s activated.", dev->dev.bus_id); | |
68094e32 PO |
509 | return 0; |
510 | } | |
511 | ||
512 | /** | |
513 | * pnp_stop_dev - low-level disable of the PnP device | |
514 | * @dev: pointer to the desired device | |
515 | * | |
516 | * does not free resources | |
517 | */ | |
68094e32 PO |
518 | int pnp_stop_dev(struct pnp_dev *dev) |
519 | { | |
520 | if (!pnp_can_disable(dev)) { | |
9dd78466 BH |
521 | pnp_dbg("Device %s does not support disabling.", |
522 | dev->dev.bus_id); | |
68094e32 PO |
523 | return -EINVAL; |
524 | } | |
9dd78466 | 525 | if (dev->protocol->disable(dev) < 0) { |
68094e32 PO |
526 | pnp_err("Failed to disable device %s.", dev->dev.bus_id); |
527 | return -EIO; | |
528 | } | |
529 | ||
530 | pnp_info("Device %s disabled.", dev->dev.bus_id); | |
68094e32 PO |
531 | return 0; |
532 | } | |
533 | ||
1da177e4 LT |
534 | /** |
535 | * pnp_activate_dev - activates a PnP device for use | |
536 | * @dev: pointer to the desired device | |
537 | * | |
538 | * does not validate or set resources so be careful. | |
539 | */ | |
540 | int pnp_activate_dev(struct pnp_dev *dev) | |
541 | { | |
68094e32 PO |
542 | int error; |
543 | ||
1da177e4 LT |
544 | if (!dev) |
545 | return -EINVAL; | |
07d4e9af | 546 | if (dev->active) |
9dd78466 | 547 | return 0; /* the device is already active */ |
1da177e4 LT |
548 | |
549 | /* ensure resources are allocated */ | |
550 | if (pnp_auto_config_dev(dev)) | |
551 | return -EBUSY; | |
552 | ||
68094e32 PO |
553 | error = pnp_start_dev(dev); |
554 | if (error) | |
555 | return error; | |
1da177e4 LT |
556 | |
557 | dev->active = 1; | |
1da177e4 LT |
558 | return 1; |
559 | } | |
560 | ||
561 | /** | |
562 | * pnp_disable_dev - disables device | |
563 | * @dev: pointer to the desired device | |
564 | * | |
565 | * inform the correct pnp protocol so that resources can be used by other devices | |
566 | */ | |
567 | int pnp_disable_dev(struct pnp_dev *dev) | |
568 | { | |
68094e32 PO |
569 | int error; |
570 | ||
9dd78466 BH |
571 | if (!dev) |
572 | return -EINVAL; | |
07d4e9af | 573 | if (!dev->active) |
9dd78466 | 574 | return 0; /* the device is already disabled */ |
1da177e4 | 575 | |
68094e32 PO |
576 | error = pnp_stop_dev(dev); |
577 | if (error) | |
578 | return error; | |
1da177e4 LT |
579 | |
580 | dev->active = 0; | |
1da177e4 LT |
581 | |
582 | /* release the resources so that other devices can use them */ | |
583 | down(&pnp_res_mutex); | |
584 | pnp_clean_resource_table(&dev->res); | |
585 | up(&pnp_res_mutex); | |
586 | ||
587 | return 1; | |
588 | } | |
589 | ||
590 | /** | |
591 | * pnp_resource_change - change one resource | |
592 | * @resource: pointer to resource to be changed | |
593 | * @start: start of region | |
594 | * @size: size of region | |
1da177e4 | 595 | */ |
b60ba834 | 596 | void pnp_resource_change(struct resource *resource, resource_size_t start, |
9dd78466 | 597 | resource_size_t size) |
1da177e4 LT |
598 | { |
599 | if (resource == NULL) | |
600 | return; | |
601 | resource->flags &= ~(IORESOURCE_AUTO | IORESOURCE_UNSET); | |
602 | resource->start = start; | |
603 | resource->end = start + size - 1; | |
604 | } | |
605 | ||
1da177e4 | 606 | EXPORT_SYMBOL(pnp_manual_config_dev); |
68094e32 PO |
607 | EXPORT_SYMBOL(pnp_start_dev); |
608 | EXPORT_SYMBOL(pnp_stop_dev); | |
1da177e4 LT |
609 | EXPORT_SYMBOL(pnp_activate_dev); |
610 | EXPORT_SYMBOL(pnp_disable_dev); | |
611 | EXPORT_SYMBOL(pnp_resource_change); | |
612 | EXPORT_SYMBOL(pnp_init_resource_table); |