Commit dd193dcd authored by Arvid Norlander's avatar Arvid Norlander Committed by Hans de Goede
Browse files

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: default avatarArvid Norlander <lkml@vorpal.se>
Link: https://lore.kernel.org/r/20220902174018.1720029-2-lkml@vorpal.se


Reviewed-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
parent db55fb8a

drivers/platform/x86/toshiba_acpi.c

+30 −0
Original line number Diff line number Diff line
@@ -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 @@ static int toshiba_acpi_add(struct acpi_device *acpi_dev) 
	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);