diff options
| author | Bill Richardson <wfrichar@chromium.org> | 2013-11-20 10:15:58 -0800 |
|---|---|---|
| committer | chrome-internal-fetch <chrome-internal-fetch@google.com> | 2013-11-21 22:21:34 +0000 |
| commit | f7dba327a2b352babbd9d6bc2f6dbd2b3c02efdd (patch) | |
| tree | 41b89af58a71db10bbbe42ee1fcffe32ce0697b7 /common/fan.c | |
| parent | 24fdf4e554f542488ba268fece6e62b2014357fd (diff) | |
| download | chrome-ec-f7dba327a2b352babbd9d6bc2f6dbd2b3c02efdd.tar.gz | |
Add DPTF interface for fan duty
This adds include/dptf.h to define the DPTF interface functions.
As the first DPTF feature, it also adds a register to the EC's ACPI
interface block. Register 0x04 is used to get and set the fan's target duty
cycle, as a percentage value. Writing a 0 to this register will set the
target duty cycle to 0, writing a 100 (0x64) will set it to 100%. Writing
any other value will return the fan control to the EC, rather than driving
it manually from the host.
Likewise, reading from this register returns the current fan target duty
cycle, as a percentage. If the EC is controlling the fan automatically, the
returned value will be 0xFF.
BUG=chrome-os-partner:23972
BRANCH=none
TEST=manual
You can monitor the fan state from the EC console with the "faninfo"
command. From the host side, test this interface from a root shell.
Read fan duty:
iotools io_write8 0x66 0x80
iotools io_write8 0x62 4
iotools io_read8 0x62
Set fan duty to 100%:
iotools io_write8 0x66 0x81
iotools io_write8 0x62 4
iotools io_write8 0x62 100
Set fan duty to 50%:
iotools io_write8 0x66 0x81
iotools io_write8 0x62 4
iotools io_write8 0x62 50
Set fan duty to 0%:
iotools io_write8 0x66 0x81
iotools io_write8 0x62 4
iotools io_write8 0x62 0
Set fan control back to automatic:
iotools io_write8 0x66 0x81
iotools io_write8 0x62 4
iotools io_write8 0x62 -1
Change-Id: I91ec463095cfd17adf452f0967da3944b254d558
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/177423
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Diffstat (limited to 'common/fan.c')
| -rw-r--r-- | common/fan.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/common/fan.c b/common/fan.c index 9d9c0f68fc..520d6fe03b 100644 --- a/common/fan.c +++ b/common/fan.c @@ -259,6 +259,36 @@ DECLARE_CONSOLE_COMMAND(fanduty, cc_fanduty, NULL); /*****************************************************************************/ +/* DPTF interface functions */ + +/* 0-100% if in duty mode. -1 if not */ +int dptf_get_fan_duty_target(void) +{ + int fan = 0; /* TODO(crosbug.com/p/23803) */ + + if (thermal_control_enabled[fan] || fan_get_rpm_mode(fan)) + return -1; + + return fan_get_duty(fan); +} + +/* 0-100% sets duty, out of range means let the EC drive */ +void dptf_set_fan_duty_target(int pct) +{ + int fan; + + if (pct < 0 || pct > 100) { + /* TODO(crosbug.com/p/23803) */ + for (fan = 0; fan < CONFIG_FANS; fan++) + set_thermal_control_enabled(fan, 1); + } else { + /* TODO(crosbug.com/p/23803) */ + for (fan = 0; fan < CONFIG_FANS; fan++) + set_duty_cycle(fan, pct); + } +} + +/*****************************************************************************/ /* Host commands */ static int hc_pwm_get_fan_target_rpm(struct host_cmd_handler_args *args) |