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platform/x86: toshiba_acpi: Add fan RPM reading (internals)

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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>
This commit is contained in:
Arvid Norlander 2022-09-02 19:40:17 +02:00 committed by Hans de Goede
parent db55fb8a06
commit dd193dcdc9
1 changed files with 30 additions and 0 deletions
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30
drivers/platform/x86/toshiba_acpi.c
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@ -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);