Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=ce44e19701ac1de004815c225585ff617c5948b4
Commit:     ce44e19701ac1de004815c225585ff617c5948b4
Parent:     3f655ef8c439e0775ffb7d1ead5d1d4f060e1f8b
Author:     Zhang Rui <[EMAIL PROTECTED]>
AuthorDate: Thu Jan 17 15:51:25 2008 +0800
Committer:  Len Brown <[EMAIL PROTECTED]>
CommitDate: Fri Feb 1 23:12:19 2008 -0500

    ACPI: ACPI thermal zone handle notification correctly
    
    Change the ACPI thermal action upon notification 0x81 and 0x82.
    
    According to the ACPI spec, we should:
    re-evaluate _PSV and _ACx methods upon notification 0x81
    re-evaluate _PSL and _ALx and _TZD upon notificaiton 0x82.
    But the current code re-evaluates all the trip points for 0x81 while
    only re-evaluates _TZD for 0x82.
    
    Fix this violation of ACPI spec.
    
    TODO: devices in _PSL, _ALx and _TZD may change after a notification 0x82.
          At this time, we need to re-bind the cooling devices with the thermal 
zone.
    
    Signed-off-by: Zhang Rui <[EMAIL PROTECTED]>
    Signed-off-by: Thomas Sujith <[EMAIL PROTECTED]>
    Signed-off-by: Len Brown <[EMAIL PROTECTED]>
---
 drivers/acpi/thermal.c |  325 +++++++++++++++++++++++++++---------------------
 1 files changed, 184 insertions(+), 141 deletions(-)

diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index c6cfce4..d317da5 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -323,173 +323,221 @@ static int acpi_thermal_set_cooling_mode(struct 
acpi_thermal *tz, int mode)
        return 0;
 }
 
-static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
-{
-       acpi_status status = AE_OK;
-       int i = 0;
+#define ACPI_TRIPS_CRITICAL    0x01
+#define ACPI_TRIPS_HOT         0x02
+#define ACPI_TRIPS_PASSIVE     0x04
+#define ACPI_TRIPS_ACTIVE      0x08
+#define ACPI_TRIPS_DEVICES     0x10
 
+#define ACPI_TRIPS_REFRESH_THRESHOLDS  (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
+#define ACPI_TRIPS_REFRESH_DEVICES     ACPI_TRIPS_DEVICES
 
-       if (!tz)
-               return -EINVAL;
+#define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |   \
+                             ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
+                             ACPI_TRIPS_DEVICES)
 
-       /* Critical Shutdown (required) */
-
-       status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL,
-                                      &tz->trips.critical.temperature);
-       if (ACPI_FAILURE(status)) {
-               tz->trips.critical.flags.valid = 0;
-               ACPI_EXCEPTION((AE_INFO, status, "No critical threshold"));
-               return -ENODEV;
-       } else {
-               tz->trips.critical.flags.valid = 1;
-               ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-                                 "Found critical threshold [%lu]\n",
-                                 tz->trips.critical.temperature));
-       }
+/*
+ * This exception is thrown out in two cases:
+ * 1.An invalid trip point becomes invalid or a valid trip point becomes 
invalid
+ *   when re-evaluating the AML code.
+ * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
+ *   We need to re-bind the cooling devices of a thermal zone when this occurs.
+ */
+#define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)       \
+do {   \
+       if (flags != ACPI_TRIPS_INIT)   \
+               ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
+               "ACPI thermal trip point %s changed\n"  \
+               "Please send acpidump to [EMAIL PROTECTED]", str)); \
+} while (0)
+
+static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
+{
+       acpi_status status = AE_OK;
+       struct acpi_handle_list devices;
+       int valid = 0;
+       int i;
 
-       if (tz->trips.critical.flags.valid == 1) {
-               if (crt == -1) {
+       /* Critical Shutdown (required) */
+       if (flag & ACPI_TRIPS_CRITICAL) {
+               status = acpi_evaluate_integer(tz->device->handle,
+                               "_CRT", NULL, &tz->trips.critical.temperature);
+               if (ACPI_FAILURE(status)) {
                        tz->trips.critical.flags.valid = 0;
-               } else if (crt > 0) {
-                       unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
-
-                       /*
-                        * Allow override to lower critical threshold
-                        */
-                       if (crt_k < tz->trips.critical.temperature)
-                               tz->trips.critical.temperature = crt_k;
+                       ACPI_EXCEPTION((AE_INFO, status,
+                                       "No critical threshold"));
+                       return -ENODEV;
+               } else {
+                       tz->trips.critical.flags.valid = 1;
+                       ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                                       "Found critical threshold [%lu]\n",
+                                       tz->trips.critical.temperature));
+               }
+               if (tz->trips.critical.flags.valid == 1) {
+                       if (crt == -1) {
+                               tz->trips.critical.flags.valid = 0;
+                       } else if (crt > 0) {
+                               unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
+                               /*
+                                * Allow override to lower critical threshold
+                                */
+                               if (crt_k < tz->trips.critical.temperature)
+                                       tz->trips.critical.temperature = crt_k;
+                       }
                }
        }
 
        /* Critical Sleep (optional) */
-
-       status =
-           acpi_evaluate_integer(tz->device->handle, "_HOT", NULL,
-                                 &tz->trips.hot.temperature);
-       if (ACPI_FAILURE(status)) {
-               tz->trips.hot.flags.valid = 0;
-               ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
-       } else {
-               tz->trips.hot.flags.valid = 1;
-               ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
-                                 tz->trips.hot.temperature));
-       }
-
-       /* Passive: Processors (optional) */
-
-       if (psv == -1) {
-               status = AE_SUPPORT;
-       } else if (psv > 0) {
-               tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv);
-               status = AE_OK;
-       } else {
+       if (flag & ACPI_TRIPS_HOT) {
                status = acpi_evaluate_integer(tz->device->handle,
-                       "_PSV", NULL, &tz->trips.passive.temperature);
+                               "_HOT", NULL, &tz->trips.hot.temperature);
+               if (ACPI_FAILURE(status)) {
+                       tz->trips.hot.flags.valid = 0;
+                       ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                                       "No hot threshold\n"));
+               } else {
+                       tz->trips.hot.flags.valid = 1;
+                       ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                                       "Found hot threshold [%lu]\n",
+                                       tz->trips.critical.temperature));
+               }
        }
 
-       if (ACPI_FAILURE(status)) {
-               tz->trips.passive.flags.valid = 0;
-               ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
-       } else {
-               tz->trips.passive.flags.valid = 1;
-
-               status =
-                   acpi_evaluate_integer(tz->device->handle, "_TC1", NULL,
-                                         &tz->trips.passive.tc1);
-               if (ACPI_FAILURE(status))
-                       tz->trips.passive.flags.valid = 0;
-
-               status =
-                   acpi_evaluate_integer(tz->device->handle, "_TC2", NULL,
-                                         &tz->trips.passive.tc2);
-               if (ACPI_FAILURE(status))
-                       tz->trips.passive.flags.valid = 0;
+       /* Passive (optional) */
+       if (flag & ACPI_TRIPS_PASSIVE) {
+               valid = tz->trips.passive.flags.valid;
+               if (psv == -1) {
+                       status = AE_SUPPORT;
+               } else if (psv > 0) {
+                       tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv);
+                       status = AE_OK;
+               } else {
+                       status = acpi_evaluate_integer(tz->device->handle,
+                               "_PSV", NULL, &tz->trips.passive.temperature);
+               }
 
-               status =
-                   acpi_evaluate_integer(tz->device->handle, "_TSP", NULL,
-                                         &tz->trips.passive.tsp);
                if (ACPI_FAILURE(status))
                        tz->trips.passive.flags.valid = 0;
-
-               status =
-                   acpi_evaluate_reference(tz->device->handle, "_PSL", NULL,
-                                           &tz->trips.passive.devices);
+               else {
+                       tz->trips.passive.flags.valid = 1;
+                       if (flag == ACPI_TRIPS_INIT) {
+                               status = acpi_evaluate_integer(
+                                               tz->device->handle, "_TC1",
+                                               NULL, &tz->trips.passive.tc1);
+                               if (ACPI_FAILURE(status))
+                                       tz->trips.passive.flags.valid = 0;
+                               status = acpi_evaluate_integer(
+                                               tz->device->handle, "_TC2",
+                                               NULL, &tz->trips.passive.tc2);
+                               if (ACPI_FAILURE(status))
+                                       tz->trips.passive.flags.valid = 0;
+                               status = acpi_evaluate_integer(
+                                               tz->device->handle, "_TSP",
+                                               NULL, &tz->trips.passive.tsp);
+                               if (ACPI_FAILURE(status))
+                                       tz->trips.passive.flags.valid = 0;
+                       }
+               }
+       }
+       if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
+               memset(&devices, 0, sizeof(struct acpi_handle_list));
+               status = acpi_evaluate_reference(tz->device->handle, "_PSL",
+                                                       NULL, &devices);
                if (ACPI_FAILURE(status))
                        tz->trips.passive.flags.valid = 0;
-
-               if (!tz->trips.passive.flags.valid)
-                       printk(KERN_WARNING PREFIX "Invalid passive 
threshold\n");
                else
-                       ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-                                         "Found passive threshold [%lu]\n",
-                                         tz->trips.passive.temperature));
-       }
+                       tz->trips.passive.flags.valid = 1;
 
-       /* Active: Fans, etc. (optional) */
+               if (memcmp(&tz->trips.passive.devices, &devices,
+                               sizeof(struct acpi_handle_list))) {
+                       memcpy(&tz->trips.passive.devices, &devices,
+                               sizeof(struct acpi_handle_list));
+                       ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
+               }
+       }
+       if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
+               if (valid != tz->trips.passive.flags.valid)
+                               ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
+       }
 
+       /* Active (optional) */
        for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
-
                char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
+               valid = tz->trips.active[i].flags.valid;
 
                if (act == -1)
-                       break;  /* disable all active trip points */
-
-               status = acpi_evaluate_integer(tz->device->handle,
-                       name, NULL, &tz->trips.active[i].temperature);
-
-               if (ACPI_FAILURE(status)) {
-                       if (i == 0)     /* no active trip points */
+                       break; /* disable all active trip points */
+
+               if (flag & ACPI_TRIPS_ACTIVE) {
+                       status = acpi_evaluate_integer(tz->device->handle,
+                               name, NULL, &tz->trips.active[i].temperature);
+                       if (ACPI_FAILURE(status)) {
+                               tz->trips.active[i].flags.valid = 0;
+                               if (i == 0)
+                                       break;
+                               if (act <= 0)
+                                       break;
+                               if (i == 1)
+                                       tz->trips.active[0].temperature =
+                                               CELSIUS_TO_KELVIN(act);
+                               else
+                                       /*
+                                        * Don't allow override higher than
+                                        * the next higher trip point
+                                        */
+                                       tz->trips.active[i - 1].temperature =
+                                               (tz->trips.active[i - 
2].temperature <
+                                               CELSIUS_TO_KELVIN(act) ?
+                                               tz->trips.active[i - 
2].temperature :
+                                               CELSIUS_TO_KELVIN(act));
                                break;
-                       if (act <= 0)   /* no override requested */
-                               break;
-                       if (i == 1) {   /* 1 trip point */
-                               tz->trips.active[0].temperature =
-                                       CELSIUS_TO_KELVIN(act);
-                       } else {        /* multiple trips */
-                               /*
-                                * Don't allow override higher than
-                                * the next higher trip point
-                                */
-                               tz->trips.active[i - 1].temperature =
-                                   (tz->trips.active[i - 2].temperature <
-                                       CELSIUS_TO_KELVIN(act) ?
-                                       tz->trips.active[i - 2].temperature :
-                                       CELSIUS_TO_KELVIN(act));
-                       }
-                       break;
+                       } else
+                               tz->trips.active[i].flags.valid = 1;
                }
 
                name[2] = 'L';
-               status =
-                   acpi_evaluate_reference(tz->device->handle, name, NULL,
-                                           &tz->trips.active[i].devices);
-               if (ACPI_SUCCESS(status)) {
-                       tz->trips.active[i].flags.valid = 1;
-                       ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-                                         "Found active threshold [%d]:[%lu]\n",
-                                         i, tz->trips.active[i].temperature));
-               } else
-                       ACPI_EXCEPTION((AE_INFO, status,
-                                       "Invalid active threshold [%d]", i));
+               if ((flag & ACPI_TRIPS_DEVICES) && 
tz->trips.active[i].flags.valid ) {
+                       memset(&devices, 0, sizeof(struct acpi_handle_list));
+                       status = acpi_evaluate_reference(tz->device->handle,
+                                               name, NULL, &devices);
+                       if (ACPI_FAILURE(status))
+                               tz->trips.active[i].flags.valid = 0;
+                       else
+                               tz->trips.active[i].flags.valid = 1;
+
+                       if (memcmp(&tz->trips.active[i].devices, &devices,
+                                       sizeof(struct acpi_handle_list))) {
+                               memcpy(&tz->trips.active[i].devices, &devices,
+                                       sizeof(struct acpi_handle_list));
+                               ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
+                       }
+               }
+               if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
+                       if (valid != tz->trips.active[i].flags.valid)
+                               ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
+
+               if (!tz->trips.active[i].flags.valid)
+                       break;
+       }
+
+       if (flag & ACPI_TRIPS_DEVICES) {
+               memset(&devices, 0, sizeof(struct acpi_handle_list));
+               status = acpi_evaluate_reference(tz->device->handle, "_TZD",
+                                               NULL, &devices);
+               if (memcmp(&tz->devices, &devices,
+                               sizeof(struct acpi_handle_list))) {
+                       memcpy(&tz->devices, &devices,
+                               sizeof(struct acpi_handle_list));
+                       ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
+               }
        }
 
        return 0;
 }
 
-static int acpi_thermal_get_devices(struct acpi_thermal *tz)
+static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 {
-       acpi_status status = AE_OK;
-
-
-       if (!tz)
-               return -EINVAL;
-
-       status =
-           acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, 
&tz->devices);
-       if (ACPI_FAILURE(status))
-               return -ENODEV;
-
-       return 0;
+       return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 }
 
 static int acpi_thermal_critical(struct acpi_thermal *tz)
@@ -1453,15 +1501,15 @@ static void acpi_thermal_notify(acpi_handle handle, u32 
event, void *data)
                acpi_thermal_check(tz);
                break;
        case ACPI_THERMAL_NOTIFY_THRESHOLDS:
-               acpi_thermal_get_trip_points(tz);
+               acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
                acpi_thermal_check(tz);
                acpi_bus_generate_proc_event(device, event, 0);
                acpi_bus_generate_netlink_event(device->pnp.device_class,
                                                  device->dev.bus_id, event, 0);
                break;
        case ACPI_THERMAL_NOTIFY_DEVICES:
-               if (tz->flags.devices)
-                       acpi_thermal_get_devices(tz);
+               acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
+               acpi_thermal_check(tz);
                acpi_bus_generate_proc_event(device, event, 0);
                acpi_bus_generate_netlink_event(device->pnp.device_class,
                                                  device->dev.bus_id, event, 0);
@@ -1504,11 +1552,6 @@ static int acpi_thermal_get_info(struct acpi_thermal *tz)
        else
                acpi_thermal_get_polling_frequency(tz);
 
-       /* Get devices in this thermal zone [_TZD] (optional) */
-       result = acpi_thermal_get_devices(tz);
-       if (!result)
-               tz->flags.devices = 1;
-
        return 0;
 }
 
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