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[linux-2.6] / drivers / acpi / hardware / hwgpe.c
1
2 /******************************************************************************
3  *
4  * Module Name: hwgpe - Low level GPE enable/disable/clear functions
5  *
6  *****************************************************************************/
7
8 /*
9  * Copyright (C) 2000 - 2006, R. Byron Moore
10  * All rights reserved.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions, and the following disclaimer,
17  *    without modification.
18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19  *    substantially similar to the "NO WARRANTY" disclaimer below
20  *    ("Disclaimer") and any redistribution must be conditioned upon
21  *    including a substantially similar Disclaimer requirement for further
22  *    binary redistribution.
23  * 3. Neither the names of the above-listed copyright holders nor the names
24  *    of any contributors may be used to endorse or promote products derived
25  *    from this software without specific prior written permission.
26  *
27  * Alternatively, this software may be distributed under the terms of the
28  * GNU General Public License ("GPL") version 2 as published by the Free
29  * Software Foundation.
30  *
31  * NO WARRANTY
32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42  * POSSIBILITY OF SUCH DAMAGES.
43  */
44
45 #include <acpi/acpi.h>
46 #include <acpi/acevents.h>
47
48 #define _COMPONENT          ACPI_HARDWARE
49 ACPI_MODULE_NAME("hwgpe")
50
51 /* Local prototypes */
52 static acpi_status
53 acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
54                                 struct acpi_gpe_block_info *gpe_block);
55
56 /******************************************************************************
57  *
58  * FUNCTION:    acpi_hw_write_gpe_enable_reg
59  *
60  * PARAMETERS:  gpe_event_info      - Info block for the GPE to be enabled
61  *
62  * RETURN:      Status
63  *
64  * DESCRIPTION: Write a GPE enable register.  Note: The bit for this GPE must
65  *              already be cleared or set in the parent register
66  *              enable_for_run mask.
67  *
68  ******************************************************************************/
69
70 acpi_status
71 acpi_hw_write_gpe_enable_reg(struct acpi_gpe_event_info *gpe_event_info)
72 {
73         struct acpi_gpe_register_info *gpe_register_info;
74         acpi_status status;
75
76         ACPI_FUNCTION_ENTRY();
77
78         /* Get the info block for the entire GPE register */
79
80         gpe_register_info = gpe_event_info->register_info;
81         if (!gpe_register_info) {
82                 return (AE_NOT_EXIST);
83         }
84
85         /* Write the entire GPE (runtime) enable register */
86
87         status = acpi_hw_low_level_write(8, gpe_register_info->enable_for_run,
88                                          &gpe_register_info->enable_address);
89
90         return (status);
91 }
92
93 /******************************************************************************
94  *
95  * FUNCTION:    acpi_hw_clear_gpe
96  *
97  * PARAMETERS:  gpe_event_info      - Info block for the GPE to be cleared
98  *
99  * RETURN:      Status
100  *
101  * DESCRIPTION: Clear the status bit for a single GPE.
102  *
103  ******************************************************************************/
104
105 acpi_status acpi_hw_clear_gpe(struct acpi_gpe_event_info * gpe_event_info)
106 {
107         acpi_status status;
108
109         ACPI_FUNCTION_ENTRY();
110
111         /*
112          * Write a one to the appropriate bit in the status register to
113          * clear this GPE.
114          */
115         status = acpi_hw_low_level_write(8, gpe_event_info->register_bit,
116                                          &gpe_event_info->register_info->
117                                          status_address);
118
119         return (status);
120 }
121
122 /******************************************************************************
123  *
124  * FUNCTION:    acpi_hw_get_gpe_status
125  *
126  * PARAMETERS:  gpe_event_info      - Info block for the GPE to queried
127  *              event_status        - Where the GPE status is returned
128  *
129  * RETURN:      Status
130  *
131  * DESCRIPTION: Return the status of a single GPE.
132  *
133  ******************************************************************************/
134
135 #ifdef ACPI_FUTURE_USAGE
136 acpi_status
137 acpi_hw_get_gpe_status(struct acpi_gpe_event_info * gpe_event_info,
138                        acpi_event_status * event_status)
139 {
140         u32 in_byte;
141         u8 register_bit;
142         struct acpi_gpe_register_info *gpe_register_info;
143         acpi_status status;
144         acpi_event_status local_event_status = 0;
145
146         ACPI_FUNCTION_ENTRY();
147
148         if (!event_status) {
149                 return (AE_BAD_PARAMETER);
150         }
151
152         /* Get the info block for the entire GPE register */
153
154         gpe_register_info = gpe_event_info->register_info;
155
156         /* Get the register bitmask for this GPE */
157
158         register_bit = gpe_event_info->register_bit;
159
160         /* GPE currently enabled? (enabled for runtime?) */
161
162         if (register_bit & gpe_register_info->enable_for_run) {
163                 local_event_status |= ACPI_EVENT_FLAG_ENABLED;
164         }
165
166         /* GPE enabled for wake? */
167
168         if (register_bit & gpe_register_info->enable_for_wake) {
169                 local_event_status |= ACPI_EVENT_FLAG_WAKE_ENABLED;
170         }
171
172         /* GPE currently active (status bit == 1)? */
173
174         status =
175             acpi_hw_low_level_read(8, &in_byte,
176                                    &gpe_register_info->status_address);
177         if (ACPI_FAILURE(status)) {
178                 goto unlock_and_exit;
179         }
180
181         if (register_bit & in_byte) {
182                 local_event_status |= ACPI_EVENT_FLAG_SET;
183         }
184
185         /* Set return value */
186
187         (*event_status) = local_event_status;
188
189       unlock_and_exit:
190         return (status);
191 }
192 #endif                          /*  ACPI_FUTURE_USAGE  */
193
194 /******************************************************************************
195  *
196  * FUNCTION:    acpi_hw_disable_gpe_block
197  *
198  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
199  *              gpe_block           - Gpe Block info
200  *
201  * RETURN:      Status
202  *
203  * DESCRIPTION: Disable all GPEs within a single GPE block
204  *
205  ******************************************************************************/
206
207 acpi_status
208 acpi_hw_disable_gpe_block(struct acpi_gpe_xrupt_info * gpe_xrupt_info,
209                           struct acpi_gpe_block_info * gpe_block)
210 {
211         u32 i;
212         acpi_status status;
213
214         /* Examine each GPE Register within the block */
215
216         for (i = 0; i < gpe_block->register_count; i++) {
217
218                 /* Disable all GPEs in this register */
219
220                 status = acpi_hw_low_level_write(8, 0x00,
221                                                  &gpe_block->register_info[i].
222                                                  enable_address);
223                 if (ACPI_FAILURE(status)) {
224                         return (status);
225                 }
226         }
227
228         return (AE_OK);
229 }
230
231 /******************************************************************************
232  *
233  * FUNCTION:    acpi_hw_clear_gpe_block
234  *
235  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
236  *              gpe_block           - Gpe Block info
237  *
238  * RETURN:      Status
239  *
240  * DESCRIPTION: Clear status bits for all GPEs within a single GPE block
241  *
242  ******************************************************************************/
243
244 acpi_status
245 acpi_hw_clear_gpe_block(struct acpi_gpe_xrupt_info * gpe_xrupt_info,
246                         struct acpi_gpe_block_info * gpe_block)
247 {
248         u32 i;
249         acpi_status status;
250
251         /* Examine each GPE Register within the block */
252
253         for (i = 0; i < gpe_block->register_count; i++) {
254
255                 /* Clear status on all GPEs in this register */
256
257                 status = acpi_hw_low_level_write(8, 0xFF,
258                                                  &gpe_block->register_info[i].
259                                                  status_address);
260                 if (ACPI_FAILURE(status)) {
261                         return (status);
262                 }
263         }
264
265         return (AE_OK);
266 }
267
268 /******************************************************************************
269  *
270  * FUNCTION:    acpi_hw_enable_runtime_gpe_block
271  *
272  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
273  *              gpe_block           - Gpe Block info
274  *
275  * RETURN:      Status
276  *
277  * DESCRIPTION: Enable all "runtime" GPEs within a single GPE block. Includes
278  *              combination wake/run GPEs.
279  *
280  ******************************************************************************/
281
282 acpi_status
283 acpi_hw_enable_runtime_gpe_block(struct acpi_gpe_xrupt_info * gpe_xrupt_info,
284                                  struct acpi_gpe_block_info * gpe_block)
285 {
286         u32 i;
287         acpi_status status;
288
289         /* NOTE: assumes that all GPEs are currently disabled */
290
291         /* Examine each GPE Register within the block */
292
293         for (i = 0; i < gpe_block->register_count; i++) {
294                 if (!gpe_block->register_info[i].enable_for_run) {
295                         continue;
296                 }
297
298                 /* Enable all "runtime" GPEs in this register */
299
300                 status =
301                     acpi_hw_low_level_write(8,
302                                             gpe_block->register_info[i].
303                                             enable_for_run,
304                                             &gpe_block->register_info[i].
305                                             enable_address);
306                 if (ACPI_FAILURE(status)) {
307                         return (status);
308                 }
309         }
310
311         return (AE_OK);
312 }
313
314 /******************************************************************************
315  *
316  * FUNCTION:    acpi_hw_enable_wakeup_gpe_block
317  *
318  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
319  *              gpe_block           - Gpe Block info
320  *
321  * RETURN:      Status
322  *
323  * DESCRIPTION: Enable all "wake" GPEs within a single GPE block. Includes
324  *              combination wake/run GPEs.
325  *
326  ******************************************************************************/
327
328 static acpi_status
329 acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
330                                 struct acpi_gpe_block_info *gpe_block)
331 {
332         u32 i;
333         acpi_status status;
334
335         /* Examine each GPE Register within the block */
336
337         for (i = 0; i < gpe_block->register_count; i++) {
338                 if (!gpe_block->register_info[i].enable_for_wake) {
339                         continue;
340                 }
341
342                 /* Enable all "wake" GPEs in this register */
343
344                 status = acpi_hw_low_level_write(8,
345                                                  gpe_block->register_info[i].
346                                                  enable_for_wake,
347                                                  &gpe_block->register_info[i].
348                                                  enable_address);
349                 if (ACPI_FAILURE(status)) {
350                         return (status);
351                 }
352         }
353
354         return (AE_OK);
355 }
356
357 /******************************************************************************
358  *
359  * FUNCTION:    acpi_hw_disable_all_gpes
360  *
361  * PARAMETERS:  None
362  *
363  * RETURN:      Status
364  *
365  * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
366  *
367  ******************************************************************************/
368
369 acpi_status acpi_hw_disable_all_gpes(void)
370 {
371         acpi_status status;
372
373         ACPI_FUNCTION_TRACE(hw_disable_all_gpes);
374
375         status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block);
376         status = acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block);
377         return_ACPI_STATUS(status);
378 }
379
380 /******************************************************************************
381  *
382  * FUNCTION:    acpi_hw_enable_all_runtime_gpes
383  *
384  * PARAMETERS:  None
385  *
386  * RETURN:      Status
387  *
388  * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
389  *
390  ******************************************************************************/
391
392 acpi_status acpi_hw_enable_all_runtime_gpes(void)
393 {
394         acpi_status status;
395
396         ACPI_FUNCTION_TRACE(hw_enable_all_runtime_gpes);
397
398         status = acpi_ev_walk_gpe_list(acpi_hw_enable_runtime_gpe_block);
399         return_ACPI_STATUS(status);
400 }
401
402 /******************************************************************************
403  *
404  * FUNCTION:    acpi_hw_enable_all_wakeup_gpes
405  *
406  * PARAMETERS:  None
407  *
408  * RETURN:      Status
409  *
410  * DESCRIPTION: Enable all "wakeup" GPEs, in all GPE blocks
411  *
412  ******************************************************************************/
413
414 acpi_status acpi_hw_enable_all_wakeup_gpes(void)
415 {
416         acpi_status status;
417
418         ACPI_FUNCTION_TRACE(hw_enable_all_wakeup_gpes);
419
420         status = acpi_ev_walk_gpe_list(acpi_hw_enable_wakeup_gpe_block);
421         return_ACPI_STATUS(status);
422 }