| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20251015084414.1391595-5-lkml@antheas.dev>
Date: Wed, 15 Oct 2025 10:44:12 +0200
From: Antheas Kapenekakis <lkml@...heas.dev>
To: platform-driver-x86@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
linux-hwmon@...r.kernel.org,
Hans de Goede <hansg@...nel.org>,
Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
Derek John Clark <derekjohn.clark@...il.com>,
Joaquín Ignacio Aramendía <samsagax@...il.com>,
Jean Delvare <jdelvare@...e.com>,
Guenter Roeck <linux@...ck-us.net>,
Antheas Kapenekakis <lkml@...heas.dev>
Subject: [PATCH v2 4/6] platform/x86: ayaneo-ec: Add controller power and
modules attributes
The Ayaneo 3 features hot-swappable controller modules. The ejection
and management is done through HID. However, after ejecting the modules,
the controller needs to be power cycled via the EC to re-initialize.
For this, the EC provides a variable that holds whether the left or
right modules are connected, and a power control register to turn
the controller on or off. After ejecting the modules, the controller
should be turned off. Then, after both modules are reinserted,
the controller may be powered on again to re-initialize.
This patch introduces two new sysfs attributes:
- `controller_modules`: a read-only attribute that indicates whether
the left and right modules are connected (none, left, right, both).
- `controller_power`: a read-write attribute that allows the user
to turn the controller on or off (with '1'/'0').
Therefore, after ejection is complete, userspace can power off the
controller, then wait until both modules have been reinserted
(`controller_modules` will return 'both') to turn on the controller.
Signed-off-by: Antheas Kapenekakis <lkml@...heas.dev>
---
.../ABI/testing/sysfs-platform-ayaneo | 19 ++++
MAINTAINERS | 1 +
drivers/platform/x86/ayaneo-ec.c | 100 ++++++++++++++++++
3 files changed, 120 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-platform-ayaneo
diff --git a/Documentation/ABI/testing/sysfs-platform-ayaneo b/Documentation/ABI/testing/sysfs-platform-ayaneo
new file mode 100644
index 000000000000..1fa32ba60fd0
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-platform-ayaneo
@@ -0,0 +1,19 @@
+What: /sys/devices/platform/<platform>/controller_power
+Date: Oct 2025
+KernelVersion: 6.9
+Contact: "Antheas Kapenekakis" <lkml@...heas.dev>
+Description:
+ Current controller power state. Allows turning on and off
+ the controller power (e.g. for power savings). Write 1 to
+ turn on, 0 to turn off. File is readable and writable.
+
+What: /sys/devices/platform/<platform>/controller_modules
+Date: Oct 2025
+KernelVersion: 6.9
+Contact: "Antheas Kapenekakis" <lkml@...heas.dev>
+Description:
+ Shows which controller modules are currently connected to
+ the device. Possible values are "left", "right" and "both".
+ File is read-only. The Windows software for this device
+ will only set controller power to 1 if both module sides
+ are connected (i.e. this file returns "both").
diff --git a/MAINTAINERS b/MAINTAINERS
index 8c4d0c26ca77..3dfa004555dd 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4191,6 +4191,7 @@ AYANEO PLATFORM EC DRIVER
M: Antheas Kapenekakis <lkml@...heas.dev>
L: platform-driver-x86@...r.kernel.org
S: Maintained
+F: Documentation/ABI/testing/sysfs-platform-ayaneo
F: drivers/platform/x86/ayaneo-ec.c
AZ6007 DVB DRIVER
diff --git a/drivers/platform/x86/ayaneo-ec.c b/drivers/platform/x86/ayaneo-ec.c
index 23c283f5eb61..363b61fc6e12 100644
--- a/drivers/platform/x86/ayaneo-ec.c
+++ b/drivers/platform/x86/ayaneo-ec.c
@@ -30,9 +30,17 @@
#define AYANEO_CHARGE_VAL_AUTO 0xaa
#define AYANEO_CHARGE_VAL_INHIBIT 0x55
+#define AYANEO_POWER_REG 0x2d
+#define AYANEO_POWER_OFF 0xfe
+#define AYANEO_POWER_ON 0xff
+#define AYANEO_MODULE_REG 0x2f
+#define AYANEO_MODULE_LEFT BIT(0)
+#define AYANEO_MODULE_RIGHT BIT(1)
+
struct ayaneo_ec_quirk {
bool has_fan_control;
bool has_charge_control;
+ bool has_magic_modules;
};
struct ayaneo_ec_platform_data {
@@ -44,6 +52,7 @@ struct ayaneo_ec_platform_data {
static const struct ayaneo_ec_quirk ayaneo3 = {
.has_fan_control = true,
.has_charge_control = true,
+ .has_magic_modules = true,
};
static const struct dmi_system_id dmi_table[] = {
@@ -262,6 +271,96 @@ static int ayaneo_remove_battery(struct power_supply *battery,
return 0;
}
+static ssize_t controller_power_store(struct device *dev,
+ struct device_attribute *attr, const char *buf,
+ size_t count)
+{
+ bool value;
+ int ret;
+
+ ret = kstrtobool(buf, &value);
+ if (ret)
+ return ret;
+
+ ret = ec_write(AYANEO_POWER_REG, value ? AYANEO_POWER_ON : AYANEO_POWER_OFF);
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+static ssize_t controller_power_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int ret;
+ u8 val;
+
+ ret = ec_read(AYANEO_POWER_REG, &val);
+ if (ret)
+ return ret;
+
+ return sysfs_emit(buf, "%d\n", val == AYANEO_POWER_ON);
+}
+
+static DEVICE_ATTR_RW(controller_power);
+
+static ssize_t controller_modules_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ bool left, right;
+ char *out;
+ int ret;
+ u8 val;
+
+ ret = ec_read(AYANEO_MODULE_REG, &val);
+ if (ret)
+ return ret;
+
+ left = !(val & AYANEO_MODULE_LEFT);
+ right = !(val & AYANEO_MODULE_RIGHT);
+
+ if (left && right)
+ out = "both";
+ else if (left)
+ out = "left";
+ else if (right)
+ out = "right";
+ else
+ out = "none";
+
+ return sysfs_emit(buf, "%s\n", out);
+}
+
+static DEVICE_ATTR_RO(controller_modules);
+
+static struct attribute *aya_mm_attrs[] = {
+ &dev_attr_controller_power.attr,
+ &dev_attr_controller_modules.attr,
+ NULL
+};
+
+static umode_t aya_mm_is_visible(struct kobject *kobj,
+ struct attribute *attr, int n)
+{
+ struct device *dev = kobj_to_dev(kobj);
+ struct platform_device *pdev = to_platform_device(dev);
+ struct ayaneo_ec_platform_data *data = platform_get_drvdata(pdev);
+
+ if (data->quirks->has_magic_modules)
+ return attr->mode;
+ return 0;
+}
+
+static const struct attribute_group aya_mm_attribute_group = {
+ .is_visible = aya_mm_is_visible,
+ .attrs = aya_mm_attrs,
+};
+
+static const struct attribute_group *ayaneo_ec_groups[] = {
+ &aya_mm_attribute_group,
+ NULL
+};
+
static int ayaneo_ec_probe(struct platform_device *pdev)
{
const struct dmi_system_id *dmi_entry;
@@ -303,6 +402,7 @@ static int ayaneo_ec_probe(struct platform_device *pdev)
static struct platform_driver ayaneo_platform_driver = {
.driver = {
.name = "ayaneo-ec",
+ .dev_groups = ayaneo_ec_groups,
},
.probe = ayaneo_ec_probe,
};
--
2.51.0
Powered by blists - more mailing lists