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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@perex.cz>
5 * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
6 * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
7 * Bjorn Helgaas <bjorn.helgaas@hp.com>
8 */
9
10#include <linux/errno.h>
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/pnp.h>
15#include <linux/bitmap.h>
16#include <linux/mutex.h>
17#include "base.h"
18
19DEFINE_MUTEX(pnp_res_mutex);
20
21static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx)
22{
23 struct resource *res, local_res;
24
25 res = pnp_get_resource(dev, IORESOURCE_IO, idx);
26 if (res) {
27 pnp_dbg(&dev->dev, " io %d already set to %#llx-%#llx "
28 "flags %#lx\n", idx, (unsigned long long) res->start,
29 (unsigned long long) res->end, res->flags);
30 return 0;
31 }
32
33 res = &local_res;
34 res->flags = rule->flags | IORESOURCE_AUTO;
35 res->start = 0;
36 res->end = 0;
37
38 if (!rule->size) {
39 res->flags |= IORESOURCE_DISABLED;
40 pnp_dbg(&dev->dev, " io %d disabled\n", idx);
41 goto __add;
42 }
43
44 res->start = rule->min;
45 res->end = res->start + rule->size - 1;
46
47 while (!pnp_check_port(dev, res)) {
48 res->start += rule->align;
49 res->end = res->start + rule->size - 1;
50 if (res->start > rule->max || !rule->align) {
51 pnp_dbg(&dev->dev, " couldn't assign io %d "
52 "(min %#llx max %#llx)\n", idx,
53 (unsigned long long) rule->min,
54 (unsigned long long) rule->max);
55 return -EBUSY;
56 }
57 }
58
59__add:
60 pnp_add_io_resource(dev, res->start, res->end, res->flags);
61 return 0;
62}
63
64static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
65{
66 struct resource *res, local_res;
67
68 res = pnp_get_resource(dev, IORESOURCE_MEM, idx);
69 if (res) {
70 pnp_dbg(&dev->dev, " mem %d already set to %#llx-%#llx "
71 "flags %#lx\n", idx, (unsigned long long) res->start,
72 (unsigned long long) res->end, res->flags);
73 return 0;
74 }
75
76 res = &local_res;
77 res->flags = rule->flags | IORESOURCE_AUTO;
78 res->start = 0;
79 res->end = 0;
80
81 if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
82 res->flags |= IORESOURCE_READONLY;
83 if (rule->flags & IORESOURCE_MEM_CACHEABLE)
84 res->flags |= IORESOURCE_CACHEABLE;
85 if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
86 res->flags |= IORESOURCE_RANGELENGTH;
87 if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
88 res->flags |= IORESOURCE_SHADOWABLE;
89
90 if (!rule->size) {
91 res->flags |= IORESOURCE_DISABLED;
92 pnp_dbg(&dev->dev, " mem %d disabled\n", idx);
93 goto __add;
94 }
95
96 res->start = rule->min;
97 res->end = res->start + rule->size - 1;
98
99 while (!pnp_check_mem(dev, res)) {
100 res->start += rule->align;
101 res->end = res->start + rule->size - 1;
102 if (res->start > rule->max || !rule->align) {
103 pnp_dbg(&dev->dev, " couldn't assign mem %d "
104 "(min %#llx max %#llx)\n", idx,
105 (unsigned long long) rule->min,
106 (unsigned long long) rule->max);
107 return -EBUSY;
108 }
109 }
110
111__add:
112 pnp_add_mem_resource(dev, res->start, res->end, res->flags);
113 return 0;
114}
115
116static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx)
117{
118 struct resource *res, local_res;
119 int i;
120
121 /* IRQ priority: this table is good for i386 */
122 static unsigned short xtab[16] = {
123 5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
124 };
125
126 res = pnp_get_resource(dev, IORESOURCE_IRQ, idx);
127 if (res) {
128 pnp_dbg(&dev->dev, " irq %d already set to %d flags %#lx\n",
129 idx, (int) res->start, res->flags);
130 return 0;
131 }
132
133 res = &local_res;
134 res->flags = rule->flags | IORESOURCE_AUTO;
135 res->start = -1;
136 res->end = -1;
137
138 if (bitmap_empty(rule->map.bits, PNP_IRQ_NR)) {
139 res->flags |= IORESOURCE_DISABLED;
140 pnp_dbg(&dev->dev, " irq %d disabled\n", idx);
141 goto __add;
142 }
143
144 /* TBD: need check for >16 IRQ */
145 res->start = find_next_bit(rule->map.bits, PNP_IRQ_NR, 16);
146 if (res->start < PNP_IRQ_NR) {
147 res->end = res->start;
148 goto __add;
149 }
150 for (i = 0; i < 16; i++) {
151 if (test_bit(xtab[i], rule->map.bits)) {
152 res->start = res->end = xtab[i];
153 if (pnp_check_irq(dev, res))
154 goto __add;
155 }
156 }
157
158 if (rule->flags & IORESOURCE_IRQ_OPTIONAL) {
159 res->start = -1;
160 res->end = -1;
161 res->flags |= IORESOURCE_DISABLED;
162 pnp_dbg(&dev->dev, " irq %d disabled (optional)\n", idx);
163 goto __add;
164 }
165
166 pnp_dbg(&dev->dev, " couldn't assign irq %d\n", idx);
167 return -EBUSY;
168
169__add:
170 pnp_add_irq_resource(dev, res->start, res->flags);
171 return 0;
172}
173
174#ifdef CONFIG_ISA_DMA_API
175static int pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
176{
177 struct resource *res, local_res;
178 int i;
179
180 /* DMA priority: this table is good for i386 */
181 static unsigned short xtab[8] = {
182 1, 3, 5, 6, 7, 0, 2, 4
183 };
184
185 res = pnp_get_resource(dev, IORESOURCE_DMA, idx);
186 if (res) {
187 pnp_dbg(&dev->dev, " dma %d already set to %d flags %#lx\n",
188 idx, (int) res->start, res->flags);
189 return 0;
190 }
191
192 res = &local_res;
193 res->flags = rule->flags | IORESOURCE_AUTO;
194 res->start = -1;
195 res->end = -1;
196
197 for (i = 0; i < 8; i++) {
198 if (rule->map & (1 << xtab[i])) {
199 res->start = res->end = xtab[i];
200 if (pnp_check_dma(dev, res))
201 goto __add;
202 }
203 }
204#ifdef MAX_DMA_CHANNELS
205 res->start = res->end = MAX_DMA_CHANNELS;
206#endif
207 res->flags |= IORESOURCE_DISABLED;
208 pnp_dbg(&dev->dev, " disable dma %d\n", idx);
209
210__add:
211 pnp_add_dma_resource(dev, res->start, res->flags);
212 return 0;
213}
214#endif /* CONFIG_ISA_DMA_API */
215
216void pnp_init_resources(struct pnp_dev *dev)
217{
218 pnp_free_resources(dev);
219}
220
221static void pnp_clean_resource_table(struct pnp_dev *dev)
222{
223 struct pnp_resource *pnp_res, *tmp;
224
225 list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {
226 if (pnp_res->res.flags & IORESOURCE_AUTO)
227 pnp_free_resource(pnp_res);
228 }
229}
230
231/**
232 * pnp_assign_resources - assigns resources to the device based on the specified dependent number
233 * @dev: pointer to the desired device
234 * @set: the dependent function number
235 */
236static int pnp_assign_resources(struct pnp_dev *dev, int set)
237{
238 struct pnp_option *option;
239 int nport = 0, nmem = 0, nirq = 0;
240 int ndma __maybe_unused = 0;
241 int ret = 0;
242
243 pnp_dbg(&dev->dev, "pnp_assign_resources, try dependent set %d\n", set);
244 mutex_lock(&pnp_res_mutex);
245 pnp_clean_resource_table(dev);
246
247 list_for_each_entry(option, &dev->options, list) {
248 if (pnp_option_is_dependent(option) &&
249 pnp_option_set(option) != set)
250 continue;
251
252 switch (option->type) {
253 case IORESOURCE_IO:
254 ret = pnp_assign_port(dev, &option->u.port, nport++);
255 break;
256 case IORESOURCE_MEM:
257 ret = pnp_assign_mem(dev, &option->u.mem, nmem++);
258 break;
259 case IORESOURCE_IRQ:
260 ret = pnp_assign_irq(dev, &option->u.irq, nirq++);
261 break;
262#ifdef CONFIG_ISA_DMA_API
263 case IORESOURCE_DMA:
264 ret = pnp_assign_dma(dev, &option->u.dma, ndma++);
265 break;
266#endif
267 default:
268 ret = -EINVAL;
269 break;
270 }
271 if (ret < 0)
272 break;
273 }
274
275 mutex_unlock(&pnp_res_mutex);
276 if (ret < 0) {
277 pnp_dbg(&dev->dev, "pnp_assign_resources failed (%d)\n", ret);
278 pnp_clean_resource_table(dev);
279 } else
280 dbg_pnp_show_resources(dev, "pnp_assign_resources succeeded");
281 return ret;
282}
283
284/**
285 * pnp_auto_config_dev - automatically assigns resources to a device
286 * @dev: pointer to the desired device
287 */
288int pnp_auto_config_dev(struct pnp_dev *dev)
289{
290 int i, ret;
291
292 if (!pnp_can_configure(dev)) {
293 pnp_dbg(&dev->dev, "configuration not supported\n");
294 return -ENODEV;
295 }
296
297 ret = pnp_assign_resources(dev, 0);
298 if (ret == 0)
299 return 0;
300
301 for (i = 1; i < dev->num_dependent_sets; i++) {
302 ret = pnp_assign_resources(dev, i);
303 if (ret == 0)
304 return 0;
305 }
306
307 dev_err(&dev->dev, "unable to assign resources\n");
308 return ret;
309}
310
311/**
312 * pnp_start_dev - low-level start of the PnP device
313 * @dev: pointer to the desired device
314 *
315 * assumes that resources have already been allocated
316 */
317int pnp_start_dev(struct pnp_dev *dev)
318{
319 if (!pnp_can_write(dev)) {
320 pnp_dbg(&dev->dev, "activation not supported\n");
321 return -EINVAL;
322 }
323
324 dbg_pnp_show_resources(dev, "pnp_start_dev");
325 if (dev->protocol->set(dev) < 0) {
326 dev_err(&dev->dev, "activation failed\n");
327 return -EIO;
328 }
329
330 dev_info(&dev->dev, "activated\n");
331 return 0;
332}
333
334/**
335 * pnp_stop_dev - low-level disable of the PnP device
336 * @dev: pointer to the desired device
337 *
338 * does not free resources
339 */
340int pnp_stop_dev(struct pnp_dev *dev)
341{
342 if (!pnp_can_disable(dev)) {
343 pnp_dbg(&dev->dev, "disabling not supported\n");
344 return -EINVAL;
345 }
346 if (dev->protocol->disable(dev) < 0) {
347 dev_err(&dev->dev, "disable failed\n");
348 return -EIO;
349 }
350
351 dev_info(&dev->dev, "disabled\n");
352 return 0;
353}
354
355/**
356 * pnp_activate_dev - activates a PnP device for use
357 * @dev: pointer to the desired device
358 *
359 * does not validate or set resources so be careful.
360 */
361int pnp_activate_dev(struct pnp_dev *dev)
362{
363 int error;
364
365 if (dev->active)
366 return 0;
367
368 /* ensure resources are allocated */
369 if (pnp_auto_config_dev(dev))
370 return -EBUSY;
371
372 error = pnp_start_dev(dev);
373 if (error)
374 return error;
375
376 dev->active = 1;
377 return 0;
378}
379
380/**
381 * pnp_disable_dev - disables device
382 * @dev: pointer to the desired device
383 *
384 * inform the correct pnp protocol so that resources can be used by other devices
385 */
386int pnp_disable_dev(struct pnp_dev *dev)
387{
388 int error;
389
390 if (!dev->active)
391 return 0;
392
393 error = pnp_stop_dev(dev);
394 if (error)
395 return error;
396
397 dev->active = 0;
398
399 /* release the resources so that other devices can use them */
400 mutex_lock(&pnp_res_mutex);
401 pnp_clean_resource_table(dev);
402 mutex_unlock(&pnp_res_mutex);
403
404 return 0;
405}
406
407EXPORT_SYMBOL(pnp_start_dev);
408EXPORT_SYMBOL(pnp_stop_dev);
409EXPORT_SYMBOL(pnp_activate_dev);
410EXPORT_SYMBOL(pnp_disable_dev);
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@perex.cz>
5 * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
6 * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
7 * Bjorn Helgaas <bjorn.helgaas@hp.com>
8 */
9
10#include <linux/errno.h>
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/pnp.h>
15#include <linux/bitmap.h>
16#include <linux/mutex.h>
17#include "base.h"
18
19DEFINE_MUTEX(pnp_res_mutex);
20
21static struct resource *pnp_find_resource(struct pnp_dev *dev,
22 unsigned char rule,
23 unsigned long type,
24 unsigned int bar)
25{
26 struct resource *res = pnp_get_resource(dev, type, bar);
27
28 /* when the resource already exists, set its resource bits from rule */
29 if (res) {
30 res->flags &= ~IORESOURCE_BITS;
31 res->flags |= rule & IORESOURCE_BITS;
32 }
33
34 return res;
35}
36
37static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx)
38{
39 struct resource *res, local_res;
40
41 res = pnp_find_resource(dev, rule->flags, IORESOURCE_IO, idx);
42 if (res) {
43 pnp_dbg(&dev->dev, " io %d already set to %#llx-%#llx "
44 "flags %#lx\n", idx, (unsigned long long) res->start,
45 (unsigned long long) res->end, res->flags);
46 return 0;
47 }
48
49 res = &local_res;
50 res->flags = rule->flags | IORESOURCE_AUTO;
51 res->start = 0;
52 res->end = 0;
53
54 if (!rule->size) {
55 res->flags |= IORESOURCE_DISABLED;
56 pnp_dbg(&dev->dev, " io %d disabled\n", idx);
57 goto __add;
58 }
59
60 res->start = rule->min;
61 res->end = res->start + rule->size - 1;
62
63 while (!pnp_check_port(dev, res)) {
64 res->start += rule->align;
65 res->end = res->start + rule->size - 1;
66 if (res->start > rule->max || !rule->align) {
67 pnp_dbg(&dev->dev, " couldn't assign io %d "
68 "(min %#llx max %#llx)\n", idx,
69 (unsigned long long) rule->min,
70 (unsigned long long) rule->max);
71 return -EBUSY;
72 }
73 }
74
75__add:
76 pnp_add_io_resource(dev, res->start, res->end, res->flags);
77 return 0;
78}
79
80static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
81{
82 struct resource *res, local_res;
83
84 res = pnp_find_resource(dev, rule->flags, IORESOURCE_MEM, idx);
85 if (res) {
86 pnp_dbg(&dev->dev, " mem %d already set to %#llx-%#llx "
87 "flags %#lx\n", idx, (unsigned long long) res->start,
88 (unsigned long long) res->end, res->flags);
89 return 0;
90 }
91
92 res = &local_res;
93 res->flags = rule->flags | IORESOURCE_AUTO;
94 res->start = 0;
95 res->end = 0;
96
97 /* ??? rule->flags restricted to 8 bits, all tests bogus ??? */
98 if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
99 res->flags |= IORESOURCE_READONLY;
100 if (rule->flags & IORESOURCE_MEM_CACHEABLE)
101 res->flags |= IORESOURCE_CACHEABLE;
102 if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
103 res->flags |= IORESOURCE_RANGELENGTH;
104 if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
105 res->flags |= IORESOURCE_SHADOWABLE;
106
107 if (!rule->size) {
108 res->flags |= IORESOURCE_DISABLED;
109 pnp_dbg(&dev->dev, " mem %d disabled\n", idx);
110 goto __add;
111 }
112
113 res->start = rule->min;
114 res->end = res->start + rule->size - 1;
115
116 while (!pnp_check_mem(dev, res)) {
117 res->start += rule->align;
118 res->end = res->start + rule->size - 1;
119 if (res->start > rule->max || !rule->align) {
120 pnp_dbg(&dev->dev, " couldn't assign mem %d "
121 "(min %#llx max %#llx)\n", idx,
122 (unsigned long long) rule->min,
123 (unsigned long long) rule->max);
124 return -EBUSY;
125 }
126 }
127
128__add:
129 pnp_add_mem_resource(dev, res->start, res->end, res->flags);
130 return 0;
131}
132
133static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx)
134{
135 struct resource *res, local_res;
136 int i;
137
138 /* IRQ priority: this table is good for i386 */
139 static unsigned short xtab[16] = {
140 5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
141 };
142
143 res = pnp_find_resource(dev, rule->flags, IORESOURCE_IRQ, idx);
144 if (res) {
145 pnp_dbg(&dev->dev, " irq %d already set to %d flags %#lx\n",
146 idx, (int) res->start, res->flags);
147 return 0;
148 }
149
150 res = &local_res;
151 res->flags = rule->flags | IORESOURCE_AUTO;
152 res->start = -1;
153 res->end = -1;
154
155 if (bitmap_empty(rule->map.bits, PNP_IRQ_NR)) {
156 res->flags |= IORESOURCE_DISABLED;
157 pnp_dbg(&dev->dev, " irq %d disabled\n", idx);
158 goto __add;
159 }
160
161 /* TBD: need check for >16 IRQ */
162 res->start = find_next_bit(rule->map.bits, PNP_IRQ_NR, 16);
163 if (res->start < PNP_IRQ_NR) {
164 res->end = res->start;
165 goto __add;
166 }
167 for (i = 0; i < 16; i++) {
168 if (test_bit(xtab[i], rule->map.bits)) {
169 res->start = res->end = xtab[i];
170 if (pnp_check_irq(dev, res))
171 goto __add;
172 }
173 }
174
175 if (rule->flags & IORESOURCE_IRQ_OPTIONAL) {
176 res->start = -1;
177 res->end = -1;
178 res->flags |= IORESOURCE_DISABLED;
179 pnp_dbg(&dev->dev, " irq %d disabled (optional)\n", idx);
180 goto __add;
181 }
182
183 pnp_dbg(&dev->dev, " couldn't assign irq %d\n", idx);
184 return -EBUSY;
185
186__add:
187 pnp_add_irq_resource(dev, res->start, res->flags);
188 return 0;
189}
190
191#ifdef CONFIG_ISA_DMA_API
192static int pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
193{
194 struct resource *res, local_res;
195 int i;
196
197 /* DMA priority: this table is good for i386 */
198 static unsigned short xtab[8] = {
199 1, 3, 5, 6, 7, 0, 2, 4
200 };
201
202 res = pnp_find_resource(dev, rule->flags, IORESOURCE_DMA, idx);
203 if (res) {
204 pnp_dbg(&dev->dev, " dma %d already set to %d flags %#lx\n",
205 idx, (int) res->start, res->flags);
206 return 0;
207 }
208
209 res = &local_res;
210 res->flags = rule->flags | IORESOURCE_AUTO;
211 res->start = -1;
212 res->end = -1;
213
214 if (!rule->map) {
215 res->flags |= IORESOURCE_DISABLED;
216 pnp_dbg(&dev->dev, " dma %d disabled\n", idx);
217 goto __add;
218 }
219
220 for (i = 0; i < 8; i++) {
221 if (rule->map & (1 << xtab[i])) {
222 res->start = res->end = xtab[i];
223 if (pnp_check_dma(dev, res))
224 goto __add;
225 }
226 }
227
228 pnp_dbg(&dev->dev, " couldn't assign dma %d\n", idx);
229 return -EBUSY;
230
231__add:
232 pnp_add_dma_resource(dev, res->start, res->flags);
233 return 0;
234}
235#endif /* CONFIG_ISA_DMA_API */
236
237void pnp_init_resources(struct pnp_dev *dev)
238{
239 pnp_free_resources(dev);
240}
241
242static void pnp_clean_resource_table(struct pnp_dev *dev)
243{
244 struct pnp_resource *pnp_res, *tmp;
245
246 list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {
247 if (pnp_res->res.flags & IORESOURCE_AUTO)
248 pnp_free_resource(pnp_res);
249 }
250}
251
252/**
253 * pnp_assign_resources - assigns resources to the device based on the specified dependent number
254 * @dev: pointer to the desired device
255 * @set: the dependent function number
256 */
257static int pnp_assign_resources(struct pnp_dev *dev, int set)
258{
259 struct pnp_option *option;
260 int nport = 0, nmem = 0, nirq = 0;
261 int ndma __maybe_unused = 0;
262 int ret = 0;
263
264 pnp_dbg(&dev->dev, "pnp_assign_resources, try dependent set %d\n", set);
265 mutex_lock(&pnp_res_mutex);
266 pnp_clean_resource_table(dev);
267
268 list_for_each_entry(option, &dev->options, list) {
269 if (pnp_option_is_dependent(option) &&
270 pnp_option_set(option) != set)
271 continue;
272
273 switch (option->type) {
274 case IORESOURCE_IO:
275 ret = pnp_assign_port(dev, &option->u.port, nport++);
276 break;
277 case IORESOURCE_MEM:
278 ret = pnp_assign_mem(dev, &option->u.mem, nmem++);
279 break;
280 case IORESOURCE_IRQ:
281 ret = pnp_assign_irq(dev, &option->u.irq, nirq++);
282 break;
283#ifdef CONFIG_ISA_DMA_API
284 case IORESOURCE_DMA:
285 ret = pnp_assign_dma(dev, &option->u.dma, ndma++);
286 break;
287#endif
288 default:
289 ret = -EINVAL;
290 break;
291 }
292 if (ret < 0)
293 break;
294 }
295
296 mutex_unlock(&pnp_res_mutex);
297 if (ret < 0) {
298 pnp_dbg(&dev->dev, "pnp_assign_resources failed (%d)\n", ret);
299 pnp_clean_resource_table(dev);
300 } else
301 dbg_pnp_show_resources(dev, "pnp_assign_resources succeeded");
302 return ret;
303}
304
305/**
306 * pnp_auto_config_dev - automatically assigns resources to a device
307 * @dev: pointer to the desired device
308 */
309int pnp_auto_config_dev(struct pnp_dev *dev)
310{
311 int i, ret;
312
313 if (!pnp_can_configure(dev)) {
314 pnp_dbg(&dev->dev, "configuration not supported\n");
315 return -ENODEV;
316 }
317
318 ret = pnp_assign_resources(dev, 0);
319 if (ret == 0)
320 return 0;
321
322 for (i = 1; i < dev->num_dependent_sets; i++) {
323 ret = pnp_assign_resources(dev, i);
324 if (ret == 0)
325 return 0;
326 }
327
328 dev_err(&dev->dev, "unable to assign resources\n");
329 return ret;
330}
331
332/**
333 * pnp_start_dev - low-level start of the PnP device
334 * @dev: pointer to the desired device
335 *
336 * assumes that resources have already been allocated
337 */
338int pnp_start_dev(struct pnp_dev *dev)
339{
340 if (!pnp_can_write(dev)) {
341 pnp_dbg(&dev->dev, "activation not supported\n");
342 return -EINVAL;
343 }
344
345 dbg_pnp_show_resources(dev, "pnp_start_dev");
346 if (dev->protocol->set(dev) < 0) {
347 dev_err(&dev->dev, "activation failed\n");
348 return -EIO;
349 }
350
351 dev_info(&dev->dev, "activated\n");
352 return 0;
353}
354
355/**
356 * pnp_stop_dev - low-level disable of the PnP device
357 * @dev: pointer to the desired device
358 *
359 * does not free resources
360 */
361int pnp_stop_dev(struct pnp_dev *dev)
362{
363 if (!pnp_can_disable(dev)) {
364 pnp_dbg(&dev->dev, "disabling not supported\n");
365 return -EINVAL;
366 }
367 if (dev->protocol->disable(dev) < 0) {
368 dev_err(&dev->dev, "disable failed\n");
369 return -EIO;
370 }
371
372 dev_info(&dev->dev, "disabled\n");
373 return 0;
374}
375
376/**
377 * pnp_activate_dev - activates a PnP device for use
378 * @dev: pointer to the desired device
379 *
380 * does not validate or set resources so be careful.
381 */
382int pnp_activate_dev(struct pnp_dev *dev)
383{
384 int error;
385
386 if (dev->active)
387 return 0;
388
389 /* ensure resources are allocated */
390 if (pnp_auto_config_dev(dev))
391 return -EBUSY;
392
393 error = pnp_start_dev(dev);
394 if (error)
395 return error;
396
397 dev->active = 1;
398 return 0;
399}
400
401/**
402 * pnp_disable_dev - disables device
403 * @dev: pointer to the desired device
404 *
405 * inform the correct pnp protocol so that resources can be used by other devices
406 */
407int pnp_disable_dev(struct pnp_dev *dev)
408{
409 int error;
410
411 if (!dev->active)
412 return 0;
413
414 error = pnp_stop_dev(dev);
415 if (error)
416 return error;
417
418 dev->active = 0;
419
420 /* release the resources so that other devices can use them */
421 mutex_lock(&pnp_res_mutex);
422 pnp_clean_resource_table(dev);
423 mutex_unlock(&pnp_res_mutex);
424
425 return 0;
426}
427
428EXPORT_SYMBOL(pnp_start_dev);
429EXPORT_SYMBOL(pnp_stop_dev);
430EXPORT_SYMBOL(pnp_activate_dev);
431EXPORT_SYMBOL(pnp_disable_dev);