platform/x86: thinkpad_acpi: Add support to detect hardware damage detection capability.

+128

2 changed files

expand all

Documentation

admin-guide

laptops

thinkpad-acpi.rst

drivers

platform

x86

lenovo

thinkpad_acpi.c

+22

Documentation/admin-guide/laptops/thinkpad-acpi.rst

··· 54 54 - Setting keyboard language 55 55 - WWAN Antenna type 56 56 - Auxmac 57 + - Hardware damage detection capability 57 58 58 59 A compatibility table by model and feature is maintained on the web 59 60 site, http://ibm-acpi.sf.net/. I appreciate any success or failure ··· 1576 1575 1577 1576 The exact semantics of the attributes may be found in 1578 1577 Documentation/ABI/testing/sysfs-class-power. 1578 + 1579 + Hardware damage detection capability 1580 + ------------------------------------ 1581 + 1582 + sysfs attributes: hwdd_status 1583 + 1584 + Thinkpads are adding the ability to detect and report hardware damage. 1585 + Add new sysfs interface to identify the damaged device status. 1586 + Initial support is available for the USB-C replaceable connector. 1587 + 1588 + The command to check device damaged status is:: 1589 + 1590 + cat /sys/devices/platform/thinkpad_acpi/hwdd_status 1591 + 1592 + This value displays status of device damaged. 1593 + 1594 + - 0 = Not Damaged 1595 + - 1 = Damaged 1596 + 1597 + The property is read-only. If feature is not supported then sysfs 1598 + attribute is not created. 1579 1599 1580 1600 Multiple Commands, Module Parameters 1581 1601 ------------------------------------

+106

drivers/platform/x86/lenovo/thinkpad_acpi.c

··· 36 36 37 37 #include <linux/acpi.h> 38 38 #include <linux/backlight.h> 39 + #include <linux/bitfield.h> 39 40 #include <linux/bitops.h> 40 41 #include <linux/delay.h> 41 42 #include <linux/dmi.h> ··· 11081 11080 .attrs = auxmac_attributes, 11082 11081 }; 11083 11082 11083 + /************************************************************************* 11084 + * HWDD subdriver, for the Lenovo Hardware Damage Detection feature. 11085 + */ 11086 + 11087 + #define HWDD_GET_DMG_USBC 0x80000001 11088 + #define HWDD_GET_CAP 0 11089 + #define HWDD_NOT_SUPPORTED BIT(31) 11090 + #define HWDD_SUPPORT_USBC BIT(0) 11091 + 11092 + #define PORT_STATUS GENMASK(7, 4) 11093 + #define NUM_PORTS 4 11094 + 11095 + static bool hwdd_support_available; 11096 + static bool ucdd_supported; 11097 + 11098 + static int hwdd_command(int command, int *output) 11099 + { 11100 + acpi_handle hwdd_handle; 11101 + 11102 + if (ACPI_FAILURE(acpi_get_handle(hkey_handle, "HWDD", &hwdd_handle))) 11103 + return -ENODEV; 11104 + 11105 + if (!acpi_evalf(hwdd_handle, output, NULL, "dd", command)) 11106 + return -EIO; 11107 + 11108 + return 0; 11109 + } 11110 + 11111 + /* sysfs type-c damage detection capability */ 11112 + static ssize_t hwdd_status_show(struct device *dev, 11113 + struct device_attribute *attr, 11114 + char *buf) 11115 + { 11116 + unsigned int damage_status, port_status; 11117 + int err, i; 11118 + 11119 + if (!ucdd_supported) 11120 + return -ENODEV; 11121 + 11122 + /* Get USB TYPE-C damage status */ 11123 + err = hwdd_command(HWDD_GET_DMG_USBC, &damage_status); 11124 + if (err) 11125 + return err; 11126 + 11127 + port_status = FIELD_GET(PORT_STATUS, damage_status); 11128 + for (i = 0; i < NUM_PORTS; i++) { 11129 + if (!(damage_status & BIT(i))) 11130 + continue; 11131 + if (port_status & BIT(i)) 11132 + return sysfs_emit(buf, "1\n"); 11133 + } 11134 + 11135 + return sysfs_emit(buf, "0\n"); 11136 + } 11137 + static DEVICE_ATTR_RO(hwdd_status); 11138 + 11139 + static struct attribute *hwdd_attributes[] = { 11140 + &dev_attr_hwdd_status.attr, 11141 + NULL 11142 + }; 11143 + 11144 + static umode_t hwdd_attr_is_visible(struct kobject *kobj, 11145 + struct attribute *attr, int n) 11146 + { 11147 + return hwdd_support_available ? attr->mode : 0; 11148 + } 11149 + 11150 + static const struct attribute_group hwdd_attr_group = { 11151 + .is_visible = hwdd_attr_is_visible, 11152 + .attrs = hwdd_attributes, 11153 + }; 11154 + 11155 + static int tpacpi_hwdd_init(struct ibm_init_struct *iibm) 11156 + { 11157 + int err, output; 11158 + 11159 + /* Below command checks the HWDD damage capability */ 11160 + err = hwdd_command(HWDD_GET_CAP, &output); 11161 + if (err) 11162 + return err; 11163 + 11164 + if (!(output & HWDD_NOT_SUPPORTED)) 11165 + return -ENODEV; 11166 + 11167 + hwdd_support_available = true; 11168 + 11169 + /* 11170 + * BIT(0) is assigned to check capability of damage detection is 11171 + * supported for USB Type-C port or not. 11172 + */ 11173 + if (output & HWDD_SUPPORT_USBC) 11174 + ucdd_supported = true; 11175 + 11176 + return err; 11177 + } 11178 + 11179 + static struct ibm_struct hwdd_driver_data = { 11180 + .name = "hwdd", 11181 + }; 11182 + 11084 11183 /* --------------------------------------------------------------------- */ 11085 11184 11086 11185 static struct attribute *tpacpi_driver_attributes[] = { ··· 11240 11139 &kbdlang_attr_group, 11241 11140 &dprc_attr_group, 11242 11141 &auxmac_attr_group, 11142 + &hwdd_attr_group, 11243 11143 NULL, 11244 11144 }; 11245 11145 ··· 11853 11751 { 11854 11752 .init = auxmac_init, 11855 11753 .data = &auxmac_data, 11754 + }, 11755 + { 11756 + .init = tpacpi_hwdd_init, 11757 + .data = &hwdd_driver_data, 11856 11758 }, 11857 11759 }; 11858 11760

Configure Feed

Configure Feed