ACPI: ibm-acpi: document fan control

This patch documents the ThinkPad fan control strategies.  Source of the
data:

0. ibm-acpi source
1. DSDTs for various ThinkPads (770, X31, X40, X41, T43, A21m, T22)
2. http://thinkwiki.org/wiki/Embedded_Controller_Firmware#Firmware_Issues
3. http://thinkwiki.org/wiki/How_to_control_fan_speed
4. Various threads about windows fan control utilities in thinkpads.com

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>

1 files changed, 108 insertions, 2 deletions

diff --git a/drivers/acpi/ibm_acpi.c b/drivers/acpi/ibm_acpi.c
index 187af1bfcb9d..faf78d3eac2d 100644
--- a/drivers/acpi/ibm_acpi.c
+++ b/drivers/acpi/ibm_acpi.c
@@ -205,7 +205,7 @@ IBM_HANDLE(led, ec, "SLED",	/* 570 */
 IBM_HANDLE(beep, ec, "BEEP");   /* all except R30, R31 */
 IBM_HANDLE(ecrd, ec, "ECRD");   /* 570 */
 IBM_HANDLE(ecwr, ec, "ECWR");   /* 570 */
-IBM_HANDLE(fans, ec, "FANS");   /* X31, X40 */
+IBM_HANDLE(fans, ec, "FANS");   /* X31, X40, X41 */
 
 IBM_HANDLE(gfan, ec, "GFAN",    /* 570 */
            "\\FSPD",            /* 600e/x, 770e, 770x */
@@ -231,6 +231,106 @@ struct ibm_thermal_sensors_struct {
         s32 temp[IBMACPI_MAX_THERMAL_SENSORS];
 };
 
+/*
+ * FAN ACCESS MODES
+ *
+ * IBMACPI_FAN_RD_ACPI_GFAN:
+ *      ACPI GFAN method: returns fan level
+ *
+ *      see IBMACPI_FAN_WR_ACPI_SFAN
+ *      EC 0x2f not available if GFAN exists
+ *
+ * IBMACPI_FAN_WR_ACPI_SFAN:
+ *      ACPI SFAN method: sets fan level, 0 (stop) to 7 (max)
+ *
+ *      EC 0x2f might be available *for reading*, but never for writing.
+ *
+ * IBMACPI_FAN_WR_TPEC:
+ *      ThinkPad EC register 0x2f (HFSP): fan control loop mode Supported
+ *      on almost all ThinkPads
+ *
+ *      Fan speed changes of any sort (including those caused by the
+ *      disengaged mode) are usually done slowly by the firmware as the
+ *      maximum ammount of fan duty cycle change per second seems to be
+ *      limited.
+ *
+ *      Reading is not available if GFAN exists.
+ *      Writing is not available if SFAN exists.
+ *
+ *      Bits
+ *       7      automatic mode engaged;
+ *              (default operation mode of the ThinkPad)
+ *              fan level is ignored in this mode.
+ *       6      disengage mode (takes precedence over bit 7);
+ *              not available on all thinkpads.  May disable
+ *              the tachometer, and speeds up fan to 100% duty-cycle,
+ *              which speeds it up far above the standard RPM
+ *              levels.  It is not impossible that it could cause
+ *              hardware damage.
+ *      5-3     unused in some models.  Extra bits for fan level
+ *              in others, but still useless as all values above
+ *              7 map to the same speed as level 7 in these models.
+ *      2-0     fan level (0..7 usually)
+ *                      0x00 = stop
+ *                      0x07 = max (set when temperatures critical)
+ *              Some ThinkPads may have other levels, see
+ *              IBMACPI_FAN_WR_ACPI_FANS (X31/X40/X41)
+ *
+ *      FIRMWARE BUG: on some models, EC 0x2f might not be initialized at
+ *      boot. Apparently the EC does not intialize it, so unless ACPI DSDT
+ *      does so, its initial value is meaningless (0x07).
+ *
+ *      For firmware bugs, refer to:
+ *      http://thinkwiki.org/wiki/Embedded_Controller_Firmware#Firmware_Issues
+ *
+ *      ----
+ *
+ *      ThinkPad EC register 0x84 (LSB), 0x85 (MSB):
+ *      Main fan tachometer reading (in RPM)
+ *
+ *      This register is present on all ThinkPads with a new-style EC, and
+ *      it is known not to be present on the A21m/e, and T22, as there is
+ *      something else in offset 0x84 according to the ACPI DSDT.  Other
+ *      ThinkPads from this same time period (and earlier) probably lack the
+ *      tachometer as well.
+ *
+ *      Unfortunately a lot of ThinkPads with new-style ECs but whose firwmare
+ *      was never fixed by IBM to report the EC firmware version string
+ *      probably support the tachometer (like the early X models), so
+ *      detecting it is quite hard.  We need more data to know for sure.
+ *
+ *      FIRMWARE BUG: always read 0x84 first, otherwise incorrect readings
+ *      might result.
+ *
+ *      FIRMWARE BUG: when EC 0x2f bit 6 is set (disengaged mode), this
+ *      register is not invalidated in ThinkPads that disable tachometer
+ *      readings.  Thus, the tachometer readings go stale.
+ *
+ *      For firmware bugs, refer to:
+ *      http://thinkwiki.org/wiki/Embedded_Controller_Firmware#Firmware_Issues
+ *
+ * IBMACPI_FAN_WR_ACPI_FANS:
+ *      ThinkPad X31, X40, X41.  Not available in the X60.
+ *
+ *      FANS ACPI handle: takes three arguments: low speed, medium speed,
+ *      high speed.  ACPI DSDT seems to map these three speeds to levels
+ *      as follows: STOP LOW LOW MED MED HIGH HIGH HIGH HIGH
+ *      (this map is stored on FAN0..FAN8 as "0,1,1,2,2,3,3,3,3")
+ *
+ *      The speeds are stored on handles
+ *      (FANA:FAN9), (FANC:FANB), (FANE:FAND).
+ *
+ *      There are three default speed sets, acessible as handles:
+ *      FS1L,FS1M,FS1H; FS2L,FS2M,FS2H; FS3L,FS3M,FS3H
+ *
+ *      ACPI DSDT switches which set is in use depending on various
+ *      factors.
+ *
+ *      IBMACPI_FAN_WR_TPEC is also available and should be used to
+ *      command the fan.  The X31/X40/X41 seems to have 8 fan levels,
+ *      but the ACPI tables just mention level 7.
+ */
+
 enum fan_status_access_mode {
         IBMACPI_FAN_NONE = 0,           /* No fan status or control */
         IBMACPI_FAN_RD_ACPI_GFAN,       /* Use ACPI GFAN */
@@ -1722,7 +1822,7 @@ static int fan_init(void)
                         /* all other models implement TP EC 0x2f control */
 
                         if (fans_handle) {
-                                /* X31, X40 */
+                                /* X31, X40, X41 */
                                 fan_control_access_mode =
                                     IBMACPI_FAN_WR_ACPI_FANS;
                                 fan_control_commands |=
@@ -1742,6 +1842,9 @@ static int fan_get_status(u8 *status)
 {
         u8 s;
 
+        /* TODO:
+         * Add IBMACPI_FAN_RD_ACPI_FANS ? */
+
         switch (fan_status_access_mode) {
         case IBMACPI_FAN_RD_ACPI_GFAN:
                 /* 570, 600e/x, 770e, 770x */
@@ -1950,6 +2053,9 @@ static int fan_write_cmd_speed(const char *cmd, int *rc)
 {
         int speed;
 
+        /* TODO:
+         * Support speed <low> <medium> <high> ? */
+
         if (sscanf(cmd, "speed %d", &speed) != 1)
                 return 0;