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| 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 /chip/lm4 | |
| 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 'chip/lm4')
| -rw-r--r-- | chip/lm4/lpc.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/chip/lm4/lpc.c b/chip/lm4/lpc.c index afbe31f717..0b9ec2771a 100644 --- a/chip/lm4/lpc.c +++ b/chip/lm4/lpc.c @@ -8,6 +8,7 @@ #include "clock.h" #include "common.h" #include "console.h" +#include "dptf.h" #include "gpio.h" #include "hooks.h" #include "host_command.h" @@ -412,7 +413,7 @@ static void handle_acpi_write(int is_cmd) /* Process complete commands */ if (acpi_cmd == EC_CMD_ACPI_READ && acpi_data_count == 1) { /* ACPI read cmd + addr */ - int result = 0; + int result = 0xff; /* value for bogus read */ switch (acpi_addr) { case EC_ACPI_MEM_VERSION: @@ -437,6 +438,12 @@ static void handle_acpi_write(int is_cmd) result = pwm_get_duty(PWM_CH_KBLIGHT); break; #endif +#ifdef CONFIG_FANS + case EC_ACPI_MEM_FAN_DUTY: + /** TODO(crosbug.com/p/23774): Fix this too */ + result = dptf_get_fan_duty_target(); + break; +#endif default: break; } @@ -463,6 +470,12 @@ static void handle_acpi_write(int is_cmd) pwm_set_duty(PWM_CH_KBLIGHT, data); break; #endif +#ifdef CONFIG_FANS + case EC_ACPI_MEM_FAN_DUTY: + /** TODO(crosbug.com/p/23774): Fix this too */ + dptf_set_fan_duty_target(data); + break; +#endif default: CPRINTF("[%T ACPI write 0x%02x = 0x%02x]\n", acpi_addr, data); |