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| author | Arvid Norlander <lkml@vorpal.se> | 2022-09-02 19:40:17 +0200 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2022-09-09 17:43:05 +0200 |
| commit | dd193dcdc9c02ee28ca0490d737d7a0636332569 (patch) | |
| tree | 3ea413c4d4f64388f561d91c5802ff9647a90116 /drivers/platform | |
| parent | db55fb8a06f241e168a4f275970f2701d52040c6 (diff) | |
| download | linux-stable-dd193dcdc9c02ee28ca0490d737d7a0636332569.tar.gz linux-stable-dd193dcdc9c02ee28ca0490d737d7a0636332569.tar.bz2 linux-stable-dd193dcdc9c02ee28ca0490d737d7a0636332569.zip | |
platform/x86: toshiba_acpi: Add fan RPM reading (internals)
This add the internal feature detection and reading function for fan RPM.
The approach is based on tracing ACPI calls using AMLI (a tracer/debugger
built into ACPI.sys) while using the Windows cooling self-test software.
The call used is {HCI_GET, 0x45, 0, 1, 0, 0} which returns:
{0x0, 0x45, fan_rpm, probably_max_rpm, 0x0, 0x0}
What is probably the max RPM is not currently used.
Signed-off-by: Arvid Norlander <lkml@vorpal.se>
Link: https://lore.kernel.org/r/20220902174018.1720029-2-lkml@vorpal.se
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Diffstat (limited to 'drivers/platform')
| -rw-r--r-- | drivers/platform/x86/toshiba_acpi.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c index 900ee68a4c0b..478b94c96dd4 100644 --- a/drivers/platform/x86/toshiba_acpi.c +++ b/drivers/platform/x86/toshiba_acpi.c @@ -106,6 +106,7 @@ MODULE_LICENSE("GPL"); #define HCI_VIDEO_OUT 0x001c #define HCI_HOTKEY_EVENT 0x001e #define HCI_LCD_BRIGHTNESS 0x002a +#define HCI_FAN_RPM 0x0045 #define HCI_WIRELESS 0x0056 #define HCI_ACCELEROMETER 0x006d #define HCI_COOLING_METHOD 0x007f @@ -185,6 +186,7 @@ struct toshiba_acpi_dev { unsigned int illumination_supported:1; unsigned int video_supported:1; unsigned int fan_supported:1; + unsigned int fan_rpm_supported:1; unsigned int system_event_supported:1; unsigned int ntfy_supported:1; unsigned int info_supported:1; @@ -1611,6 +1613,29 @@ static const struct proc_ops fan_proc_ops = { .proc_write = fan_proc_write, }; +/* Fan RPM */ +static int get_fan_rpm(struct toshiba_acpi_dev *dev, u32 *rpm) +{ + u32 in[TCI_WORDS] = { HCI_GET, HCI_FAN_RPM, 0, 1, 0, 0 }; + u32 out[TCI_WORDS]; + acpi_status status = tci_raw(dev, in, out); + + if (ACPI_FAILURE(status)) { + pr_err("ACPI call to get Fan speed failed\n"); + return -EIO; + } + + if (out[0] == TOS_NOT_SUPPORTED) + return -ENODEV; + + if (out[0] == TOS_SUCCESS) { + *rpm = out[2]; + return 0; + } + + return -EIO; +} + static int keys_proc_show(struct seq_file *m, void *v) { struct toshiba_acpi_dev *dev = m->private; @@ -2915,6 +2940,8 @@ static void print_supported_features(struct toshiba_acpi_dev *dev) pr_cont(" video-out"); if (dev->fan_supported) pr_cont(" fan"); + if (dev->fan_rpm_supported) + pr_cont(" fan-rpm"); if (dev->tr_backlight_supported) pr_cont(" transflective-backlight"); if (dev->illumination_supported) @@ -3144,6 +3171,9 @@ iio_error: ret = get_fan_status(dev, &dummy); dev->fan_supported = !ret; + ret = get_fan_rpm(dev, &dummy); + dev->fan_rpm_supported = !ret; + toshiba_wwan_available(dev); if (dev->wwan_supported) toshiba_acpi_setup_wwan_rfkill(dev); |