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

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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>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Hao Wei Tee 2017-08-15 00:13:51 +08:00 committed by Andy Shevchenko
parent c977b98bbe
commit ade5029618
1 changed files with 69 additions and 0 deletions
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69
drivers/platform/x86/ideapad-laptop.c
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@ -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;