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

   1 /*****************************************************************************
   2  *
   3  * Module Name: bmnotify.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
  30
  31 #define _COMPONENT              ACPI_BUS_MANAGER
  32          MODULE_NAME            ("bmnotify")
  33
  34
  35 /****************************************************************************
  36  *                            Internal Functions
  37  ****************************************************************************/
  38
  39 /****************************************************************************
  40  *
  41  * FUNCTION:    bm_generate_notify
  42  *
  43  * PARAMETERS:  <TBD>
  44  *
  45  * RETURN:      <TBD>
  46  *
  47  * DESCRIPTION: <TBD>
  48  *
  49  ****************************************************************************/
  50
  51 ACPI_STATUS
  52 bm_generate_notify (
  53         BM_NODE                 *node,
  54         u32                     notify_type)
  55 {
  56         ACPI_STATUS             status = AE_OK;
  57
  58         FUNCTION_TRACE("bm_generate_notify");
  59
  60         if (!node) {
  61                 return_ACPI_STATUS(AE_BAD_PARAMETER);
  62         }
  63
  64         DEBUG_PRINT(ACPI_INFO, ("Sending notify [0x%02x] to device [0x%02x].\n", notify_type, node->device.handle));
  65
  66         if (!(node->device.flags & BM_FLAGS_DRIVER_CONTROL) ||
  67                 !(node->driver.notify)) {
  68                 DEBUG_PRINT(ACPI_WARN, ("No driver installed for device [0x%02x].\n", node->device.handle));
  69                 return_ACPI_STATUS(AE_NOT_EXIST);
  70         }
  71
  72         status = node->driver.notify(notify_type, node->device.handle,
  73                 &(node->driver.context));
  74
  75         return_ACPI_STATUS(status);
  76 }
  77
  78
  79 /****************************************************************************
  80  *
  81  * FUNCTION:    bm_device_check
  82  *
  83  * PARAMETERS:  <TBD>
  84  *
  85  * RETURN:      <TBD>
  86  *
  87  * DESCRIPTION: <TBD>
  88  *
  89  ****************************************************************************/
  90
  91 ACPI_STATUS
  92 bm_device_check (
  93         BM_NODE                 *node,
  94         u32                     *status_change)
  95 {
  96         ACPI_STATUS             status = AE_OK;
  97         BM_DEVICE               *device = NULL;
  98         BM_DEVICE_STATUS        old_status = BM_STATUS_UNKNOWN;
  99
 100         FUNCTION_TRACE("bm_device_check");
 101
 102         if (!node) {
 103                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 104         }
 105
 106         device = &(node->device);
 107
 108         if (status_change) {
 109                 *status_change = FALSE;
 110         }
 111
 112         old_status = device->status;
 113
 114         /*
 115          * Parent Present?
 116          * ---------------
 117          * Only check this device if its parent is present (which implies
 118          * this device MAY be present).
 119          */
 120         if (!BM_NODE_PRESENT(node->parent)) {
 121                 return_ACPI_STATUS(AE_OK);
 122         }
 123
 124         /*
 125          * Get Status:
 126          * -----------
 127          * And see if the status has changed.
 128          */
 129         status = bm_get_status(device);
 130         if (ACPI_FAILURE(status)) {
 131                 return_ACPI_STATUS(status);
 132         }
 133
 134         if (old_status == node->device.status) {
 135                 return_ACPI_STATUS(AE_OK);
 136         }
 137
 138         if (status_change) {
 139                 *status_change = TRUE;
 140         }
 141
 142         /*
 143          * Device Insertion?
 144          * -----------------
 145          */
 146         if ((device->status & BM_STATUS_PRESENT) &&
 147                 !(old_status & BM_STATUS_PRESENT)) {
 148                 /* TODO: Make sure driver is loaded, and if not, load. */
 149                 status = bm_generate_notify(node, BM_NOTIFY_DEVICE_ADDED);
 150         }
 151
 152         /*
 153          * Device Removal?
 154          * ---------------
 155          */
 156         else if (!(device->status & BM_STATUS_PRESENT) &&
 157                 (old_status & BM_STATUS_PRESENT)) {
 158                 /* TODO: Unload driver if last device instance. */
 159                 status = bm_generate_notify(node, BM_NOTIFY_DEVICE_REMOVED);
 160         }
 161
 162         return_ACPI_STATUS(AE_OK);
 163 }
 164
 165
 166 /****************************************************************************
 167  *
 168  * FUNCTION:    bm_bus_check
 169  *
 170  * PARAMETERS:  <TBD>
 171  *
 172  * RETURN:      <TBD>
 173  *
 174  * DESCRIPTION: <TBD>
 175  *
 176  ****************************************************************************/
 177
 178 ACPI_STATUS
 179 bm_bus_check (
 180         BM_NODE                 *parent_node)
 181 {
 182         ACPI_STATUS             status = AE_OK;
 183         u32                     status_change = FALSE;
 184
 185         FUNCTION_TRACE("bm_bus_check");
 186
 187         if (!parent_node) {
 188                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 189         }
 190
 191         /*
 192          * Status Change?
 193          * --------------
 194          */
 195         status = bm_device_check(parent_node, &status_change);
 196         if (ACPI_FAILURE(status) || !status_change) {
 197                 return_ACPI_STATUS(status);
 198         }
 199
 200         /*
 201          * Enumerate Scope:
 202          * ----------------
 203          * TODO: Enumerate child devices within this device's scope and
 204          *       run bm_device_check()'s on them...
 205          */
 206
 207         return_ACPI_STATUS(AE_OK);
 208 }
 209
 210
 211 /****************************************************************************
 212  *                            External Functions
 213  ****************************************************************************/
 214
 215 /****************************************************************************
 216  *
 217  * FUNCTION:    bm_notify
 218  *
 219  * PARAMETERS:  <TBD>
 220  *
 221  * RETURN:      <TBD>
 222  *
 223  * DESCRIPTION: <TBD>
 224  *
 225  ****************************************************************************/
 226
 227 void
 228 bm_notify (
 229         ACPI_HANDLE             acpi_handle,
 230         u32                     notify_value,
 231         void                    *context)
 232 {
 233         ACPI_STATUS             status = AE_OK;
 234         BM_NODE                 *node = NULL;
 235
 236         FUNCTION_TRACE("bm_notify");
 237
 238         /*
 239          * Resolve the ACPI handle.
 240          */
 241         status = bm_get_node(0, acpi_handle, &node);
 242         if (ACPI_FAILURE(status)) {
 243                 DEBUG_PRINT(ACPI_INFO, ("Recieved notify [0x%02x] for unknown device [%p].\n", notify_value, acpi_handle));
 244                 return_VOID;
 245         }
 246
 247         /*
 248          * Device-Specific or Standard?
 249          * ----------------------------
 250          * Device-specific notifies are forwarded to the control module's
 251          * notify() function for processing.  Standard notifies are handled
 252          * internally.
 253          */
 254         if (notify_value > 0x7F) {
 255                 status = bm_generate_notify(node, notify_value);
 256         }
 257         else {
 258                 switch (notify_value) {
 259
 260                 case BM_NOTIFY_BUS_CHECK:
 261                         DEBUG_PRINT(ACPI_INFO, ("Received BUS CHECK notification.\n"));
 262                         status = bm_bus_check(node);
 263                         break;
 264
 265                 case BM_NOTIFY_DEVICE_CHECK:
 266                         DEBUG_PRINT(ACPI_INFO, ("Received DEVICE CHECK notification.\n"));
 267                         status = bm_device_check(node, NULL);
 268                         break;
 269
 270                 case BM_NOTIFY_DEVICE_WAKE:
 271                         DEBUG_PRINT(ACPI_INFO, ("Received DEVICE WAKE notification.\n"));
 272                         /* TODO */
 273                         break;
 274
 275                 case BM_NOTIFY_EJECT_REQUEST:
 276                         DEBUG_PRINT(ACPI_INFO, ("Received EJECT REQUEST notification.\n"));
 277                         /* TODO */
 278                         break;
 279
 280                 case BM_NOTIFY_DEVICE_CHECK_LIGHT:
 281                         DEBUG_PRINT(ACPI_INFO, ("Received DEVICE CHECK LIGHT notification.\n"));
 282                         /* TODO: Exactly what does the 'light' mean? */
 283                         status = bm_device_check(node, NULL);
 284                         break;
 285
 286                 case BM_NOTIFY_FREQUENCY_MISMATCH:
 287                         DEBUG_PRINT(ACPI_INFO, ("Received FREQUENCY MISMATCH notification.\n"));
 288                         /* TODO */
 289                         break;
 290
 291                 case BM_NOTIFY_BUS_MODE_MISMATCH:
 292                         DEBUG_PRINT(ACPI_INFO, ("Received BUS MODE MISMATCH notification.\n"));
 293                         /* TODO */
 294                         break;
 295
 296                 case BM_NOTIFY_POWER_FAULT:
 297                         DEBUG_PRINT(ACPI_INFO, ("Received POWER FAULT notification.\n"));
 298                         /* TODO */
 299                         break;
 300
 301                 default:
 302                         DEBUG_PRINT(ACPI_INFO, ("Received unknown/unsupported notification.\n"));
 303                         break;
 304                 }
 305         }
 306
 307         return_VOID;
 308 }
 309
 310