| 1 | // SPDX-License-Identifier: GPL-2.0 | 
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| 2 | /* | 
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| 3 | * Device physical location support | 
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| 4 | * | 
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| 5 | * Author: Won Chung <wonchung@google.com> | 
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| 6 | */ | 
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| 7 |  | 
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| 8 | #include <linux/acpi.h> | 
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| 9 | #include <linux/sysfs.h> | 
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| 10 | #include <linux/string_choices.h> | 
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| 11 |  | 
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| 12 | #include "physical_location.h" | 
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| 13 |  | 
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| 14 | bool dev_add_physical_location(struct device *dev) | 
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| 15 | { | 
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| 16 | struct acpi_pld_info *pld; | 
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| 17 |  | 
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| 18 | if (!has_acpi_companion(dev)) | 
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| 19 | return false; | 
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| 20 |  | 
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| 21 | if (!acpi_get_physical_device_location(ACPI_HANDLE(dev), pld: &pld)) | 
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| 22 | return false; | 
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| 23 |  | 
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| 24 | dev->physical_location = | 
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| 25 | kzalloc(sizeof(*dev->physical_location), GFP_KERNEL); | 
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| 26 | if (!dev->physical_location) { | 
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| 27 | ACPI_FREE(pld); | 
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| 28 | return false; | 
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| 29 | } | 
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| 30 |  | 
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| 31 | dev->physical_location->panel = pld->panel; | 
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| 32 | dev->physical_location->vertical_position = pld->vertical_position; | 
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| 33 | dev->physical_location->horizontal_position = pld->horizontal_position; | 
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| 34 | dev->physical_location->dock = pld->dock; | 
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| 35 | dev->physical_location->lid = pld->lid; | 
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| 36 |  | 
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| 37 | ACPI_FREE(pld); | 
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| 38 | return true; | 
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| 39 | } | 
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| 40 |  | 
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| 41 | static ssize_t panel_show(struct device *dev, struct device_attribute *attr, | 
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| 42 | char *buf) | 
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| 43 | { | 
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| 44 | const char *panel; | 
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| 45 |  | 
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| 46 | switch (dev->physical_location->panel) { | 
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| 47 | case DEVICE_PANEL_TOP: | 
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| 48 | panel = "top"; | 
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| 49 | break; | 
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| 50 | case DEVICE_PANEL_BOTTOM: | 
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| 51 | panel = "bottom"; | 
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| 52 | break; | 
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| 53 | case DEVICE_PANEL_LEFT: | 
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| 54 | panel = "left"; | 
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| 55 | break; | 
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| 56 | case DEVICE_PANEL_RIGHT: | 
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| 57 | panel = "right"; | 
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| 58 | break; | 
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| 59 | case DEVICE_PANEL_FRONT: | 
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| 60 | panel = "front"; | 
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| 61 | break; | 
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| 62 | case DEVICE_PANEL_BACK: | 
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| 63 | panel = "back"; | 
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| 64 | break; | 
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| 65 | default: | 
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| 66 | panel = "unknown"; | 
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| 67 | } | 
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| 68 | return sysfs_emit(buf, fmt: "%s\n", panel); | 
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| 69 | } | 
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| 70 | static DEVICE_ATTR_RO(panel); | 
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| 71 |  | 
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| 72 | static ssize_t vertical_position_show(struct device *dev, | 
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| 73 | struct device_attribute *attr, char *buf) | 
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| 74 | { | 
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| 75 | const char *vertical_position; | 
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| 76 |  | 
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| 77 | switch (dev->physical_location->vertical_position) { | 
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| 78 | case DEVICE_VERT_POS_UPPER: | 
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| 79 | vertical_position = "upper"; | 
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| 80 | break; | 
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| 81 | case DEVICE_VERT_POS_CENTER: | 
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| 82 | vertical_position = "center"; | 
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| 83 | break; | 
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| 84 | case DEVICE_VERT_POS_LOWER: | 
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| 85 | vertical_position = "lower"; | 
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| 86 | break; | 
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| 87 | default: | 
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| 88 | vertical_position = "unknown"; | 
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| 89 | } | 
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| 90 | return sysfs_emit(buf, fmt: "%s\n", vertical_position); | 
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| 91 | } | 
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| 92 | static DEVICE_ATTR_RO(vertical_position); | 
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| 93 |  | 
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| 94 | static ssize_t horizontal_position_show(struct device *dev, | 
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| 95 | struct device_attribute *attr, char *buf) | 
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| 96 | { | 
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| 97 | const char *horizontal_position; | 
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| 98 |  | 
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| 99 | switch (dev->physical_location->horizontal_position) { | 
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| 100 | case DEVICE_HORI_POS_LEFT: | 
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| 101 | horizontal_position = "left"; | 
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| 102 | break; | 
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| 103 | case DEVICE_HORI_POS_CENTER: | 
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| 104 | horizontal_position = "center"; | 
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| 105 | break; | 
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| 106 | case DEVICE_HORI_POS_RIGHT: | 
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| 107 | horizontal_position = "right"; | 
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| 108 | break; | 
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| 109 | default: | 
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| 110 | horizontal_position = "unknown"; | 
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| 111 | } | 
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| 112 | return sysfs_emit(buf, fmt: "%s\n", horizontal_position); | 
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| 113 | } | 
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| 114 | static DEVICE_ATTR_RO(horizontal_position); | 
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| 115 |  | 
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| 116 | static ssize_t dock_show(struct device *dev, struct device_attribute *attr, | 
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| 117 | char *buf) | 
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| 118 | { | 
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| 119 | return sysfs_emit(buf, fmt: "%s\n", | 
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| 120 | str_yes_no(v: dev->physical_location->dock)); | 
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| 121 | } | 
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| 122 | static DEVICE_ATTR_RO(dock); | 
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| 123 |  | 
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| 124 | static ssize_t lid_show(struct device *dev, struct device_attribute *attr, | 
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| 125 | char *buf) | 
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| 126 | { | 
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| 127 | return sysfs_emit(buf, fmt: "%s\n", | 
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| 128 | str_yes_no(v: dev->physical_location->lid)); | 
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| 129 | } | 
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| 130 | static DEVICE_ATTR_RO(lid); | 
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| 131 |  | 
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| 132 | static struct attribute *dev_attr_physical_location[] = { | 
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| 133 | &dev_attr_panel.attr, | 
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| 134 | &dev_attr_vertical_position.attr, | 
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| 135 | &dev_attr_horizontal_position.attr, | 
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| 136 | &dev_attr_dock.attr, | 
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| 137 | &dev_attr_lid.attr, | 
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| 138 | NULL, | 
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| 139 | }; | 
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| 140 |  | 
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| 141 | const struct attribute_group dev_attr_physical_location_group = { | 
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| 142 | .name = "physical_location", | 
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| 143 | .attrs = dev_attr_physical_location, | 
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| 144 | }; | 
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| 145 |  | 
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| 146 |  | 
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