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Commit ade50296 authored by Hao Wei Tee's avatar Hao Wei Tee Committed by Andy Shevchenko
Browse files

platform/x86: ideapad-laptop: Expose conservation mode switch 



This exposes the battery conservation mode present on some (?) IdeaPads.
The mode is set by calling ACPI method SBMC with argument 3 (on) or
5 (off). Status is reported in bit 5 of the return value of ACPI method
GBMD.

Signed-off-by: default avatarHao Wei Tee <angelsl@in04.sg>
Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
parent c977b98b

drivers/platform/x86/ideapad-laptop.c

+69 −0
Original line number Diff line number Diff line
@@ -42,6 +42,8 @@ 


#define IDEAPAD_RFKILL_DEV_NUM	(3)



#define BM_CONSERVATION_BIT (5)



#define CFG_BT_BIT	(16)

#define CFG_3G_BIT	(17)

#define CFG_WIFI_BIT	(18)
@@ -54,6 +56,11 @@ static const char *const ideapad_wmi_fnesc_events[] = { 
};

#endif



enum {

	BMCMD_CONSERVATION_ON = 3,

	BMCMD_CONSERVATION_OFF = 5,

};



enum {

	VPCCMD_R_VPC1 = 0x10,

	VPCCMD_R_BL_MAX,
@@ -123,6 +130,23 @@ static int read_method_int(acpi_handle handle, const char *method, int *val) 
	}

}



static int method_gbmd(acpi_handle handle, unsigned long *ret)

{

	int result, val;



	result = read_method_int(handle, "GBMD", &val);

	*ret = val;

	return result;

}



static int method_sbmc(acpi_handle handle, int cmd)

{

	acpi_status status;



	status = acpi_execute_simple_method(handle, "SBMC", cmd);

	return ACPI_FAILURE(status) ? -1 : 0;

}



static int method_vpcr(acpi_handle handle, int cmd, int *ret)

{

	acpi_status status;
@@ -250,6 +274,13 @@ static int debugfs_status_show(struct seq_file *s, void *data) 
	if (!read_ec_data(priv->adev->handle, VPCCMD_R_CAMERA, &value))

		seq_printf(s, "Camera status:\t%s(%lu)\n",

			   value ? "On" : "Off", value);

	seq_puts(s, "=====================\n");



	if (!method_gbmd(priv->adev->handle, &value)) {

		seq_printf(s, "Conservation mode:\t%s(%lu)\n",

			   test_bit(BM_CONSERVATION_BIT, &value) ? "On" : "Off",

			   value);

	}



	return 0;

}
@@ -456,10 +487,45 @@ static ssize_t __maybe_unused touchpad_store(struct device *dev, 


static DEVICE_ATTR_RO(touchpad);



static ssize_t conservation_mode_show(struct device *dev,

				struct device_attribute *attr,

				char *buf)

{

	struct ideapad_private *priv = dev_get_drvdata(dev);

	unsigned long result;



	if (method_gbmd(priv->adev->handle, &result))

		return sprintf(buf, "-1\n");

	return sprintf(buf, "%u\n", test_bit(BM_CONSERVATION_BIT, &result));

}



static ssize_t conservation_mode_store(struct device *dev,

				 struct device_attribute *attr,

				 const char *buf, size_t count)

{

	struct ideapad_private *priv = dev_get_drvdata(dev);

	bool state;

	int ret;



	ret = kstrtobool(buf, &state);

	if (ret)

		return ret;



	ret = method_sbmc(priv->adev->handle, state ?

					      BMCMD_CONSERVATION_ON :

					      BMCMD_CONSERVATION_OFF);

	if (ret < 0)

		return -EIO;

	return count;

}



static DEVICE_ATTR_RW(conservation_mode);



static struct attribute *ideapad_attributes[] = {

	&dev_attr_camera_power.attr,

	&dev_attr_fan_mode.attr,

	&dev_attr_touchpad.attr,

	&dev_attr_conservation_mode.attr,

	NULL

};
@@ -477,6 +543,9 @@ static umode_t ideapad_is_visible(struct kobject *kobj, 
		unsigned long value;

		supported = !read_ec_data(priv->adev->handle, VPCCMD_R_FAN,

					  &value);

	} else if (attr == &dev_attr_conservation_mode.attr) {

		supported = acpi_has_method(priv->adev->handle, "GBMD") &&

			    acpi_has_method(priv->adev->handle, "SBMC");

	} else

		supported = true;