diff options
| -rw-r--r-- | Documentation/admin-guide/laptops/thinkpad-acpi.rst | 22 | ||||
| -rw-r--r-- | drivers/platform/x86/lenovo/thinkpad_acpi.c | 106 |
2 files changed, 128 insertions, 0 deletions
diff --git a/Documentation/admin-guide/laptops/thinkpad-acpi.rst b/Documentation/admin-guide/laptops/thinkpad-acpi.rst index 4ab0fef7d440..2f910ff31b37 100644 --- a/Documentation/admin-guide/laptops/thinkpad-acpi.rst +++ b/Documentation/admin-guide/laptops/thinkpad-acpi.rst @@ -54,6 +54,7 @@ detailed description): - Setting keyboard language - WWAN Antenna type - Auxmac + - Hardware damage detection capability A compatibility table by model and feature is maintained on the web site, http://ibm-acpi.sf.net/. I appreciate any success or failure @@ -1576,6 +1577,27 @@ percentage level, above which charging will stop. The exact semantics of the attributes may be found in Documentation/ABI/testing/sysfs-class-power. +Hardware damage detection capability +------------------------------------ + +sysfs attributes: hwdd_status + +Thinkpads are adding the ability to detect and report hardware damage. +Add new sysfs interface to identify the damaged device status. +Initial support is available for the USB-C replaceable connector. + +The command to check device damaged status is:: + + cat /sys/devices/platform/thinkpad_acpi/hwdd_status + +This value displays status of device damaged. + +- 0 = Not Damaged +- 1 = Damaged + +The property is read-only. If feature is not supported then sysfs +attribute is not created. + Multiple Commands, Module Parameters ------------------------------------ diff --git a/drivers/platform/x86/lenovo/thinkpad_acpi.c b/drivers/platform/x86/lenovo/thinkpad_acpi.c index cc19fe520ea9..b5bebfe29d60 100644 --- a/drivers/platform/x86/lenovo/thinkpad_acpi.c +++ b/drivers/platform/x86/lenovo/thinkpad_acpi.c @@ -36,6 +36,7 @@ #include <linux/acpi.h> #include <linux/backlight.h> +#include <linux/bitfield.h> #include <linux/bitops.h> #include <linux/delay.h> #include <linux/dmi.h> @@ -11080,6 +11081,106 @@ static const struct attribute_group auxmac_attr_group = { .attrs = auxmac_attributes, }; +/************************************************************************* + * HWDD subdriver, for the Lenovo Hardware Damage Detection feature. + */ + +#define HWDD_GET_DMG_USBC 0x80000001 +#define HWDD_GET_CAP 0 +#define HWDD_NOT_SUPPORTED BIT(31) +#define HWDD_SUPPORT_USBC BIT(0) + +#define PORT_STATUS GENMASK(7, 4) +#define NUM_PORTS 4 + +static bool hwdd_support_available; +static bool ucdd_supported; + +static int hwdd_command(int command, int *output) +{ + acpi_handle hwdd_handle; + + if (ACPI_FAILURE(acpi_get_handle(hkey_handle, "HWDD", &hwdd_handle))) + return -ENODEV; + + if (!acpi_evalf(hwdd_handle, output, NULL, "dd", command)) + return -EIO; + + return 0; +} + +/* sysfs type-c damage detection capability */ +static ssize_t hwdd_status_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + unsigned int damage_status, port_status; + int err, i; + + if (!ucdd_supported) + return -ENODEV; + + /* Get USB TYPE-C damage status */ + err = hwdd_command(HWDD_GET_DMG_USBC, &damage_status); + if (err) + return err; + + port_status = FIELD_GET(PORT_STATUS, damage_status); + for (i = 0; i < NUM_PORTS; i++) { + if (!(damage_status & BIT(i))) + continue; + if (port_status & BIT(i)) + return sysfs_emit(buf, "1\n"); + } + + return sysfs_emit(buf, "0\n"); +} +static DEVICE_ATTR_RO(hwdd_status); + +static struct attribute *hwdd_attributes[] = { + &dev_attr_hwdd_status.attr, + NULL +}; + +static umode_t hwdd_attr_is_visible(struct kobject *kobj, + struct attribute *attr, int n) +{ + return hwdd_support_available ? attr->mode : 0; +} + +static const struct attribute_group hwdd_attr_group = { + .is_visible = hwdd_attr_is_visible, + .attrs = hwdd_attributes, +}; + +static int tpacpi_hwdd_init(struct ibm_init_struct *iibm) +{ + int err, output; + + /* Below command checks the HWDD damage capability */ + err = hwdd_command(HWDD_GET_CAP, &output); + if (err) + return err; + + if (!(output & HWDD_NOT_SUPPORTED)) + return -ENODEV; + + hwdd_support_available = true; + + /* + * BIT(0) is assigned to check capability of damage detection is + * supported for USB Type-C port or not. + */ + if (output & HWDD_SUPPORT_USBC) + ucdd_supported = true; + + return err; +} + +static struct ibm_struct hwdd_driver_data = { + .name = "hwdd", +}; + /* --------------------------------------------------------------------- */ static struct attribute *tpacpi_driver_attributes[] = { @@ -11139,6 +11240,7 @@ static const struct attribute_group *tpacpi_groups[] = { &kbdlang_attr_group, &dprc_attr_group, &auxmac_attr_group, + &hwdd_attr_group, NULL, }; @@ -11752,6 +11854,10 @@ static struct ibm_init_struct ibms_init[] __initdata = { .init = auxmac_init, .data = &auxmac_data, }, + { + .init = tpacpi_hwdd_init, + .data = &hwdd_driver_data, + }, }; static int __init set_ibm_param(const char *val, const struct kernel_param *kp) |