drivers/bus/acpi/ospm/busmgr/bmpm.c

   1 /*****************************************************************************
   2  *
   3  * Module Name: bmpm.c
   4  *   $Revision$
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  *  Copyright (C) 2000, 2001 Andrew Grover
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License as published by
  13  *  the Free Software Foundation; either version 2 of the License, or
  14  *  (at your option) any later version.
  15  *
  16  *  This program is distributed in the hope that it will be useful,
  17  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *  GNU General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License
  22  *  along with this program; if not, write to the Free Software
  23  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24  */
  25
  26
  27 #include <acpi.h>
  28 #include "bm.h"
  29 #include "bmpower.h"
  30
  31
  32 #define _COMPONENT              ACPI_POWER_CONTROL
  33         MODULE_NAME             ("bmpm")
  34
  35
  36 /****************************************************************************
  37  *                             Internal Functions
  38  ****************************************************************************/
  39
  40 /****************************************************************************
  41  *
  42  * FUNCTION:    bm_get_inferred_power_state
  43  *
  44  * PARAMETERS:  <TBD>
  45  *
  46  * RETURN:      <TBD>
  47  *
  48  * DESCRIPTION: <TBD>
  49  *
  50  ****************************************************************************/
  51
  52 ACPI_STATUS
  53 bm_get_inferred_power_state (
  54         BM_DEVICE               *device)
  55 {
  56         ACPI_STATUS             status = AE_OK;
  57         BM_HANDLE_LIST          pr_list;
  58         BM_POWER_STATE          list_state = ACPI_STATE_UNKNOWN;
  59         char                    object_name[5] = {'_','P','R','0','\0'};
  60         u32                     i = 0;
  61
  62         FUNCTION_TRACE("bm_get_inferred_power_state");
  63
  64         if (!device) {
  65                 return_ACPI_STATUS(AE_BAD_PARAMETER);
  66         }
  67
  68         MEMSET(&pr_list, 0, sizeof(BM_HANDLE_LIST));
  69
  70         device->power.state = ACPI_STATE_D3;
  71
  72         /*
  73          * Calculate Power State:
  74          * ----------------------
  75          * Try to infer the devices's power state by checking the state of
  76          * the devices's power resources.  We start by evaluating _PR0
  77          * (resource requirements at D0) and work through _PR1 and _PR2.
  78          * We know the current devices power state when all resources (for
  79          * a give Dx state) are ON.  If no power resources are on then the
  80          * device is assumed to be off (D3).
  81          */
  82         for (i=ACPI_STATE_D0; i<ACPI_STATE_D3; i++) {
  83
  84                 status = bm_evaluate_reference_list(device->acpi_handle,
  85                         object_name, &pr_list);
  86
  87                 if (ACPI_SUCCESS(status)) {
  88
  89                         status = bm_pr_list_get_state(&pr_list,
  90                                 &list_state);
  91
  92                         if (ACPI_SUCCESS(status)) {
  93
  94                                 if (list_state == ACPI_STATE_D0) {
  95                                         device->power.state = i;
  96                                         break;
  97                                 }
  98                         }
  99                 }
 100         }
 101
 102         return_ACPI_STATUS(AE_OK);
 103 }
 104
 105
 106 /****************************************************************************
 107  *                             External Functions
 108  ****************************************************************************/
 109
 110 /****************************************************************************
 111  *
 112  * FUNCTION:    bm_get_power_state
 113  *
 114  * PARAMETERS:  <TBD>
 115  *
 116  * RETURN:      <TBD>
 117  *
 118  * DESCRIPTION: <TBD>
 119  *
 120  ****************************************************************************/
 121
 122 ACPI_STATUS
 123 bm_get_power_state (
 124         BM_NODE                 *node)
 125 {
 126         ACPI_STATUS             status = AE_OK;
 127         BM_DEVICE               *device = NULL;
 128
 129         FUNCTION_TRACE("bm_get_power_state");
 130
 131         if (!node) {
 132                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 133         }
 134
 135         device = &(node->device);
 136
 137         device->power.state = ACPI_STATE_UNKNOWN;
 138
 139         if (device->flags & BM_FLAGS_POWER_STATE) {
 140                 status = bm_evaluate_simple_integer(device->acpi_handle,
 141                         "_PSC", &(device->power.state));
 142         }
 143         else {
 144                 status = bm_get_inferred_power_state(device);
 145         }
 146
 147         if (ACPI_SUCCESS(status)) {
 148                 DEBUG_PRINT(ACPI_INFO, ("Device [0x%02x] is at power state [D%d].\n", device->handle, device->power.state));
 149         }
 150         else {
 151                 DEBUG_PRINT(ACPI_INFO, ("Error getting power state for device [0x%02x]\n", device->handle));
 152         }
 153
 154         return_ACPI_STATUS(status);
 155 }
 156
 157
 158 /****************************************************************************
 159  *
 160  * FUNCTION:    bm_set_power_state
 161  *
 162  * PARAMETERS:  <TBD>
 163  *
 164  * RETURN:      <TBD>
 165  *
 166  * DESCRIPTION: <TBD>
 167  *
 168  ****************************************************************************/
 169
 170 ACPI_STATUS
 171 bm_set_power_state (
 172         BM_NODE                 *node,
 173         BM_POWER_STATE          state)
 174 {
 175         ACPI_STATUS             status = AE_OK;
 176         BM_DEVICE               *device = NULL;
 177         BM_DEVICE               *parent_device = NULL;
 178         BM_HANDLE_LIST          current_list;
 179         BM_HANDLE_LIST          target_list;
 180         char                    object_name[5] = {'_','P','R','0','\0'};
 181
 182         FUNCTION_TRACE("bm_set_power_state");
 183
 184         if (!node || !node->parent || (state > ACPI_STATE_D3)) {
 185                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 186         }
 187
 188         MEMSET(&current_list, 0, sizeof(BM_HANDLE_LIST));
 189         MEMSET(&target_list, 0, sizeof(BM_HANDLE_LIST));
 190
 191         device = &(node->device);
 192         parent_device = &(node->parent->device);
 193
 194         /*
 195          * Check Parent's Power State:
 196          * ---------------------------
 197          * Can't be in a higher power state (lower Dx value) than parent.
 198          */
 199         if (state < parent_device->power.state) {
 200                 DEBUG_PRINT(ACPI_WARN, ("Cannot set device [0x%02x] to a higher-powered state than parent_device.\n", device->handle));
 201                 return_ACPI_STATUS(AE_ERROR);
 202         }
 203
 204         /*
 205          * Get Resources:
 206          * --------------
 207          * Get the power resources associated with the device's current
 208          * and target power states.
 209          */
 210         if (device->power.state != ACPI_STATE_UNKNOWN) {
 211                 object_name[3] = '0' + device->power.state;
 212                 bm_evaluate_reference_list(device->acpi_handle,
 213                         object_name, &current_list);
 214         }
 215
 216         object_name[3] = '0' + state;
 217         bm_evaluate_reference_list(device->acpi_handle, object_name,
 218                 &target_list);
 219
 220         /*
 221          * Transition Resources:
 222          * ---------------------
 223          * Transition all power resources referenced by this device to
 224          * the correct power state (taking into consideration sequencing
 225          * and dependencies to other devices).
 226          */
 227         if (current_list.count || target_list.count) {
 228                 status = bm_pr_list_transition(&current_list, &target_list);
 229         }
 230         if (ACPI_FAILURE(status)) {
 231                 return_ACPI_STATUS(status);
 232         }
 233
 234         /*
 235          * Execute _PSx:
 236          * -------------
 237          * Execute the _PSx method corresponding to the target Dx state,
 238          * if it exists.
 239          */
 240         object_name[2] = 'S';
 241         object_name[3] = '0' + state;
 242         bm_evaluate_object(device->acpi_handle, object_name, NULL, NULL);
 243
 244         if (ACPI_SUCCESS(status)) {
 245                 DEBUG_PRINT(ACPI_INFO, ("Device [0x%02x] is now at [D%d].\n", device->handle, state));
 246                 device->power.state = state;
 247         }
 248
 249         return_ACPI_STATUS(status);
 250 }
 251
 252
 253 /****************************************************************************
 254  *
 255  * FUNCTION:    bm_get_pm_capabilities
 256  *
 257  * PARAMETERS:  <TBD>
 258  *
 259  * RETURN:      <TBD>
 260  *
 261  * DESCRIPTION: <TBD>
 262  *
 263  ****************************************************************************/
 264
 265 ACPI_STATUS
 266 bm_get_pm_capabilities (
 267         BM_NODE                 *node)
 268 {
 269         ACPI_STATUS             status = AE_OK;
 270         BM_DEVICE               *device = NULL;
 271         BM_DEVICE               *parent_device = NULL;
 272         ACPI_HANDLE             acpi_handle = NULL;
 273         BM_POWER_STATE          dx_supported = ACPI_STATE_UNKNOWN;
 274         char                    object_name[5] = {'_','S','0','D','\0'};
 275         u32                     i = 0;
 276
 277         FUNCTION_TRACE("bm_get_pm_capabilities");
 278
 279         if (!node || !node->parent) {
 280                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 281         }
 282
 283         device = &(node->device);
 284         parent_device = &(node->parent->device);
 285
 286         /*
 287          * Power Management Flags:
 288          * -----------------------
 289          */
 290         if (ACPI_SUCCESS(acpi_get_handle(device->acpi_handle, "_PSC",
 291                 &acpi_handle))) {
 292                 device->power.flags |= BM_FLAGS_POWER_STATE;
 293         }
 294
 295         if (ACPI_SUCCESS(acpi_get_handle(device->acpi_handle, "_IRC",
 296                 &acpi_handle))) {
 297                 device->power.flags |= BM_FLAGS_INRUSH_CURRENT;
 298         }
 299
 300         if (ACPI_SUCCESS(acpi_get_handle(device->acpi_handle, "_PRW",
 301                 &acpi_handle))) {
 302                 device->power.flags |= BM_FLAGS_WAKE_CAPABLE;
 303         }
 304
 305         /*
 306          * Device Power State:
 307          * -------------------
 308          * Note that we can't get the device's power state until we've
 309          * initialized all power resources, so for now we just set to
 310          * unknown.
 311          */
 312         device->power.state = ACPI_STATE_UNKNOWN;
 313
 314         /*
 315          * Dx Supported in S0:
 316          * -------------------
 317          * Figure out which Dx states are supported by this device for the
 318          * S0 (working) state.  Note that D0 and D3 are required (assumed).
 319          */
 320         device->power.dx_supported[ACPI_STATE_S0] = BM_FLAGS_D0_SUPPORT |
 321                 BM_FLAGS_D3_SUPPORT;
 322
 323         if ((ACPI_SUCCESS(acpi_get_handle(device->acpi_handle, "_PR1",
 324                 &acpi_handle))) ||
 325                 (ACPI_SUCCESS(acpi_get_handle(device->acpi_handle, "_PS1",
 326                 &acpi_handle)))) {
 327                 device->power.dx_supported[ACPI_STATE_S0] |=
 328                         BM_FLAGS_D1_SUPPORT;
 329         }
 330
 331         if ((ACPI_SUCCESS(acpi_get_handle(device->acpi_handle, "_PR2",
 332                 &acpi_handle))) ||
 333                 (ACPI_SUCCESS(acpi_get_handle(device->acpi_handle, "_PS2",
 334                 &acpi_handle)))) {
 335                 device->power.dx_supported[ACPI_STATE_S0] |=
 336                         BM_FLAGS_D2_SUPPORT;
 337         }
 338
 339         /*
 340          * Dx Supported in S1-S5:
 341          * ----------------------
 342          * Figure out which Dx states are supported by this device for
 343          * all other Sx states.
 344          */
 345         for (i = ACPI_STATE_S1; i <= ACPI_STATE_S5; i++) {
 346
 347                 /*
 348                  * D3 support is assumed (off is always possible!).
 349                  */
 350                 device->power.dx_supported[i] = BM_FLAGS_D3_SUPPORT;
 351
 352                 /*
 353                  * Evalute _SxD:
 354                  * -------------
 355                  * Which returns the highest (power) Dx state supported in
 356                  * this system (Sx) state.  We convert this value to a bit
 357                  * mask of supported states (conceptually simpler).
 358                  */
 359                 status = bm_evaluate_simple_integer(device->acpi_handle,
 360                         object_name, &dx_supported);
 361                 if (ACPI_SUCCESS(status)) {
 362                         switch (dx_supported) {
 363                         case 0:
 364                                 device->power.dx_supported[i] |=
 365                                         BM_FLAGS_D0_SUPPORT;
 366                                 /* fall through */
 367                         case 1:
 368                                 device->power.dx_supported[i] |=
 369                                         BM_FLAGS_D1_SUPPORT;
 370                                 /* fall through */
 371                         case 2:
 372                                 device->power.dx_supported[i] |=
 373                                         BM_FLAGS_D2_SUPPORT;
 374                                 /* fall through */
 375                         case 3:
 376                                 device->power.dx_supported[i] |=
 377                                         BM_FLAGS_D3_SUPPORT;
 378                                 break;
 379                         }
 380
 381                         /*
 382                          * Validate:
 383                          * ---------
 384                          * Mask of any states that _Sx_d falsely advertises
 385                          * (e.g.claims D1 support but neither _PR2 or _PS2
 386                          * exist).  In other words, S1-S5 can't offer a Dx
 387                          * state that isn't supported by S0.
 388                          */
 389                         device->power.dx_supported[i] &=
 390                                 device->power.dx_supported[ACPI_STATE_S0];
 391                 }
 392
 393                 object_name[2]++;
 394         }
 395
 396         return_ACPI_STATUS(status);
 397 }