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Subject[PATCH v2] platform/x86: ideapad-laptop: Expose conservation mode switch
Date
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: Hao Wei Tee <angelsl@in04.sg>
---
drivers/platform/x86/ideapad-laptop.c | 70 +++++++++++++++++++++++++++++++++++
1 file changed, 70 insertions(+)

diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
index 603fc6050971..fffc7f65072e 100644
--- a/drivers/platform/x86/ideapad-laptop.c
+++ b/drivers/platform/x86/ideapad-laptop.c
@@ -42,6 +42,8 @@

#define IDEAPAD_RFKILL_DEV_NUM (3)

+#define GBMD_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 {
+ SBMC_CONSERVATION_ON = 3,
+ SBMC_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 val;
+ int 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(GBMD_CONSERVATION_BIT, &value) ? "On" : "Off",
+ value);
+ }

return 0;
}
@@ -456,10 +487,46 @@ static ssize_t __maybe_unused touchpad_store(struct device *dev,

static DEVICE_ATTR_RO(touchpad);

+static ssize_t show_ideapad_conservation(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ unsigned long result;
+ struct ideapad_private *priv = dev_get_drvdata(dev);
+
+ if (method_gbmd(priv->adev->handle, &result))
+ return sprintf(buf, "-1\n");
+ return sprintf(buf, "%u\n", test_bit(GBMD_CONSERVATION_BIT, &result));
+}
+
+static ssize_t store_ideapad_conservation(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int ret;
+ bool state;
+ struct ideapad_private *priv = dev_get_drvdata(dev);
+
+ ret = kstrtobool(buf, &state);
+ if (ret)
+ return ret;
+
+ ret = method_sbmc(priv->adev->handle, state ?
+ SBMC_CONSERVATION_ON :
+ SBMC_CONSERVATION_OFF);
+ if (ret < 0)
+ return -EIO;
+ return count;
+}
+
+static DEVICE_ATTR(conservation_mode, 0644, show_ideapad_conservation,
+ store_ideapad_conservation);
+
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 +544,9 @@ 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;

--
2.14.1
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