1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Asus Wireless Radio Control Driver 4 * 5 * Copyright (C) 2015-2016 Endless Mobile, Inc. 6 */ 7 8 #include <linux/kernel.h> 9 #include <linux/module.h> 10 #include <linux/init.h> 11 #include <linux/types.h> 12 #include <linux/acpi.h> 13 #include <linux/input.h> 14 #include <linux/pci_ids.h> 15 #include <linux/leds.h> 16 17 struct hswc_params { 18 u8 on; 19 u8 off; 20 u8 status; 21 }; 22 23 struct asus_wireless_data { 24 struct input_dev *idev; 25 struct acpi_device *adev; 26 const struct hswc_params *hswc_params; 27 struct workqueue_struct *wq; 28 struct work_struct led_work; 29 struct led_classdev led; 30 int led_state; 31 }; 32 33 static const struct hswc_params atk4001_id_params = { 34 .on = 0x0, 35 .off = 0x1, 36 .status = 0x2, 37 }; 38 39 static const struct hswc_params atk4002_id_params = { 40 .on = 0x5, 41 .off = 0x4, 42 .status = 0x2, 43 }; 44 45 static const struct acpi_device_id device_ids[] = { 46 {"ATK4001", (kernel_ulong_t)&atk4001_id_params}, 47 {"ATK4002", (kernel_ulong_t)&atk4002_id_params}, 48 {"", 0}, 49 }; 50 MODULE_DEVICE_TABLE(acpi, device_ids); 51 52 static acpi_status asus_wireless_method(acpi_handle handle, const char *method, 53 int param, u64 *ret) 54 { 55 struct acpi_object_list p; 56 union acpi_object obj; 57 acpi_status s; 58 59 acpi_handle_debug(handle, "Evaluating method %s, parameter %#x\n", 60 method, param); 61 obj.type = ACPI_TYPE_INTEGER; 62 obj.integer.value = param; 63 p.count = 1; 64 p.pointer = &obj; 65 66 s = acpi_evaluate_integer(handle, (acpi_string) method, &p, ret); 67 if (ACPI_FAILURE(s)) 68 acpi_handle_err(handle, 69 "Failed to eval method %s, param %#x (%d)\n", 70 method, param, s); 71 else 72 acpi_handle_debug(handle, "%s returned %#llx\n", method, *ret); 73 74 return s; 75 } 76 77 static enum led_brightness led_state_get(struct led_classdev *led) 78 { 79 struct asus_wireless_data *data; 80 acpi_status s; 81 u64 ret; 82 83 data = container_of(led, struct asus_wireless_data, led); 84 s = asus_wireless_method(acpi_device_handle(data->adev), "HSWC", 85 data->hswc_params->status, &ret); 86 if (ACPI_SUCCESS(s) && ret == data->hswc_params->on) 87 return LED_FULL; 88 return LED_OFF; 89 } 90 91 static void led_state_update(struct work_struct *work) 92 { 93 struct asus_wireless_data *data; 94 u64 ret; 95 96 data = container_of(work, struct asus_wireless_data, led_work); 97 asus_wireless_method(acpi_device_handle(data->adev), "HSWC", 98 data->led_state, &ret); 99 } 100 101 static void led_state_set(struct led_classdev *led, enum led_brightness value) 102 { 103 struct asus_wireless_data *data; 104 105 data = container_of(led, struct asus_wireless_data, led); 106 data->led_state = value == LED_OFF ? data->hswc_params->off : 107 data->hswc_params->on; 108 queue_work(data->wq, &data->led_work); 109 } 110 111 static void asus_wireless_notify(struct acpi_device *adev, u32 event) 112 { 113 struct asus_wireless_data *data = acpi_driver_data(adev); 114 115 dev_dbg(&adev->dev, "event=%#x\n", event); 116 if (event != 0x88) { 117 dev_notice(&adev->dev, "Unknown ASHS event: %#x\n", event); 118 return; 119 } 120 input_report_key(data->idev, KEY_RFKILL, 1); 121 input_sync(data->idev); 122 input_report_key(data->idev, KEY_RFKILL, 0); 123 input_sync(data->idev); 124 } 125 126 static int asus_wireless_add(struct acpi_device *adev) 127 { 128 struct asus_wireless_data *data; 129 const struct acpi_device_id *id; 130 int err; 131 132 data = devm_kzalloc(&adev->dev, sizeof(*data), GFP_KERNEL); 133 if (!data) 134 return -ENOMEM; 135 adev->driver_data = data; 136 data->adev = adev; 137 138 data->idev = devm_input_allocate_device(&adev->dev); 139 if (!data->idev) 140 return -ENOMEM; 141 data->idev->name = "Asus Wireless Radio Control"; 142 data->idev->phys = "asus-wireless/input0"; 143 data->idev->id.bustype = BUS_HOST; 144 data->idev->id.vendor = PCI_VENDOR_ID_ASUSTEK; 145 set_bit(EV_KEY, data->idev->evbit); 146 set_bit(KEY_RFKILL, data->idev->keybit); 147 err = input_register_device(data->idev); 148 if (err) 149 return err; 150 151 for (id = device_ids; id->id[0]; id++) { 152 if (!strcmp((char *) id->id, acpi_device_hid(adev))) { 153 data->hswc_params = 154 (const struct hswc_params *)id->driver_data; 155 break; 156 } 157 } 158 if (!data->hswc_params) 159 return 0; 160 161 data->wq = create_singlethread_workqueue("asus_wireless_workqueue"); 162 if (!data->wq) 163 return -ENOMEM; 164 INIT_WORK(&data->led_work, led_state_update); 165 data->led.name = "asus-wireless::airplane"; 166 data->led.brightness_set = led_state_set; 167 data->led.brightness_get = led_state_get; 168 data->led.flags = LED_CORE_SUSPENDRESUME; 169 data->led.max_brightness = 1; 170 data->led.default_trigger = "rfkill-none"; 171 err = devm_led_classdev_register(&adev->dev, &data->led); 172 if (err) 173 destroy_workqueue(data->wq); 174 175 return err; 176 } 177 178 static int asus_wireless_remove(struct acpi_device *adev) 179 { 180 struct asus_wireless_data *data = acpi_driver_data(adev); 181 182 if (data->wq) { 183 devm_led_classdev_unregister(&adev->dev, &data->led); 184 destroy_workqueue(data->wq); 185 } 186 return 0; 187 } 188 189 static struct acpi_driver asus_wireless_driver = { 190 .name = "Asus Wireless Radio Control Driver", 191 .class = "hotkey", 192 .ids = device_ids, 193 .ops = { 194 .add = asus_wireless_add, 195 .remove = asus_wireless_remove, 196 .notify = asus_wireless_notify, 197 }, 198 }; 199 module_acpi_driver(asus_wireless_driver); 200 201 MODULE_DESCRIPTION("Asus Wireless Radio Control Driver"); 202 MODULE_AUTHOR("João Paulo Rechi Vita <jprvita@gmail.com>"); 203 MODULE_LICENSE("GPL"); 204