500 строки
10 KiB
C
500 строки
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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Dell Airplane Mode Switch driver
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Copyright (C) 2014-2015 Pali Rohár <pali@kernel.org>
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*/
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#include <linux/module.h>
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#include <linux/acpi.h>
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#include <linux/rfkill.h>
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#include <linux/input.h>
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#include "dell-rbtn.h"
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enum rbtn_type {
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RBTN_UNKNOWN,
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RBTN_TOGGLE,
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RBTN_SLIDER,
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};
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struct rbtn_data {
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enum rbtn_type type;
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struct rfkill *rfkill;
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struct input_dev *input_dev;
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bool suspended;
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};
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/*
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* acpi functions
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*/
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static enum rbtn_type rbtn_check(struct acpi_device *device)
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{
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unsigned long long output;
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acpi_status status;
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status = acpi_evaluate_integer(device->handle, "CRBT", NULL, &output);
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if (ACPI_FAILURE(status))
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return RBTN_UNKNOWN;
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switch (output) {
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case 0:
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case 1:
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return RBTN_TOGGLE;
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case 2:
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case 3:
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return RBTN_SLIDER;
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default:
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return RBTN_UNKNOWN;
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}
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}
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static int rbtn_get(struct acpi_device *device)
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{
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unsigned long long output;
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acpi_status status;
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status = acpi_evaluate_integer(device->handle, "GRBT", NULL, &output);
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if (ACPI_FAILURE(status))
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return -EINVAL;
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return !output;
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}
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static int rbtn_acquire(struct acpi_device *device, bool enable)
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{
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struct acpi_object_list input;
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union acpi_object param;
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acpi_status status;
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param.type = ACPI_TYPE_INTEGER;
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param.integer.value = enable;
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input.count = 1;
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input.pointer = ¶m;
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status = acpi_evaluate_object(device->handle, "ARBT", &input, NULL);
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if (ACPI_FAILURE(status))
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return -EINVAL;
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return 0;
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}
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/*
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* rfkill device
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*/
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static void rbtn_rfkill_query(struct rfkill *rfkill, void *data)
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{
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struct acpi_device *device = data;
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int state;
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state = rbtn_get(device);
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if (state < 0)
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return;
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rfkill_set_states(rfkill, state, state);
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}
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static int rbtn_rfkill_set_block(void *data, bool blocked)
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{
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/* NOTE: setting soft rfkill state is not supported */
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return -EINVAL;
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}
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static const struct rfkill_ops rbtn_ops = {
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.query = rbtn_rfkill_query,
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.set_block = rbtn_rfkill_set_block,
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};
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static int rbtn_rfkill_init(struct acpi_device *device)
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{
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struct rbtn_data *rbtn_data = device->driver_data;
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int ret;
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if (rbtn_data->rfkill)
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return 0;
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/*
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* NOTE: rbtn controls all radio devices, not only WLAN
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* but rfkill interface does not support "ANY" type
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* so "WLAN" type is used
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*/
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rbtn_data->rfkill = rfkill_alloc("dell-rbtn", &device->dev,
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RFKILL_TYPE_WLAN, &rbtn_ops, device);
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if (!rbtn_data->rfkill)
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return -ENOMEM;
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ret = rfkill_register(rbtn_data->rfkill);
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if (ret) {
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rfkill_destroy(rbtn_data->rfkill);
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rbtn_data->rfkill = NULL;
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return ret;
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}
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return 0;
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}
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static void rbtn_rfkill_exit(struct acpi_device *device)
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{
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struct rbtn_data *rbtn_data = device->driver_data;
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if (!rbtn_data->rfkill)
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return;
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rfkill_unregister(rbtn_data->rfkill);
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rfkill_destroy(rbtn_data->rfkill);
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rbtn_data->rfkill = NULL;
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}
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static void rbtn_rfkill_event(struct acpi_device *device)
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{
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struct rbtn_data *rbtn_data = device->driver_data;
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if (rbtn_data->rfkill)
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rbtn_rfkill_query(rbtn_data->rfkill, device);
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}
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/*
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* input device
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*/
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static int rbtn_input_init(struct rbtn_data *rbtn_data)
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{
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int ret;
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rbtn_data->input_dev = input_allocate_device();
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if (!rbtn_data->input_dev)
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return -ENOMEM;
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rbtn_data->input_dev->name = "DELL Wireless hotkeys";
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rbtn_data->input_dev->phys = "dellabce/input0";
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rbtn_data->input_dev->id.bustype = BUS_HOST;
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rbtn_data->input_dev->evbit[0] = BIT(EV_KEY);
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set_bit(KEY_RFKILL, rbtn_data->input_dev->keybit);
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ret = input_register_device(rbtn_data->input_dev);
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if (ret) {
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input_free_device(rbtn_data->input_dev);
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rbtn_data->input_dev = NULL;
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return ret;
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}
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return 0;
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}
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static void rbtn_input_exit(struct rbtn_data *rbtn_data)
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{
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input_unregister_device(rbtn_data->input_dev);
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rbtn_data->input_dev = NULL;
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}
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static void rbtn_input_event(struct rbtn_data *rbtn_data)
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{
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input_report_key(rbtn_data->input_dev, KEY_RFKILL, 1);
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input_sync(rbtn_data->input_dev);
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input_report_key(rbtn_data->input_dev, KEY_RFKILL, 0);
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input_sync(rbtn_data->input_dev);
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}
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/*
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* acpi driver
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*/
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static int rbtn_add(struct acpi_device *device);
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static int rbtn_remove(struct acpi_device *device);
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static void rbtn_notify(struct acpi_device *device, u32 event);
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static const struct acpi_device_id rbtn_ids[] = {
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{ "DELRBTN", 0 },
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{ "DELLABCE", 0 },
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/*
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* This driver can also handle the "DELLABC6" device that
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* appears on the XPS 13 9350, but that device is disabled by
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* the DSDT unless booted with acpi_osi="!Windows 2012"
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* acpi_osi="!Windows 2013".
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*
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* According to Mario at Dell:
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*
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* DELLABC6 is a custom interface that was created solely to
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* have airplane mode support for Windows 7. For Windows 10
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* the proper interface is to use that which is handled by
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* intel-hid. A OEM airplane mode driver is not used.
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*
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* Since the kernel doesn't identify as Windows 7 it would be
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* incorrect to do attempt to use that interface.
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*
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* Even if we override _OSI and bind to DELLABC6, we end up with
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* inconsistent behavior in which userspace can get out of sync
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* with the rfkill state as it conflicts with events from
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* intel-hid.
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*
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* The upshot is that it is better to just ignore DELLABC6
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* devices.
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*/
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{ "", 0 },
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};
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#ifdef CONFIG_PM_SLEEP
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static void ACPI_SYSTEM_XFACE rbtn_clear_suspended_flag(void *context)
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{
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struct rbtn_data *rbtn_data = context;
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rbtn_data->suspended = false;
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}
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static int rbtn_suspend(struct device *dev)
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{
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struct acpi_device *device = to_acpi_device(dev);
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struct rbtn_data *rbtn_data = acpi_driver_data(device);
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rbtn_data->suspended = true;
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return 0;
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}
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static int rbtn_resume(struct device *dev)
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{
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struct acpi_device *device = to_acpi_device(dev);
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struct rbtn_data *rbtn_data = acpi_driver_data(device);
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acpi_status status;
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/*
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* Upon resume, some BIOSes send an ACPI notification thet triggers
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* an unwanted input event. In order to ignore it, we use a flag
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* that we set at suspend and clear once we have received the extra
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* ACPI notification. Since ACPI notifications are delivered
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* asynchronously to drivers, we clear the flag from the workqueue
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* used to deliver the notifications. This should be enough
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* to have the flag cleared only after we received the extra
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* notification, if any.
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*/
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status = acpi_os_execute(OSL_NOTIFY_HANDLER,
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rbtn_clear_suspended_flag, rbtn_data);
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if (ACPI_FAILURE(status))
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rbtn_clear_suspended_flag(rbtn_data);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(rbtn_pm_ops, rbtn_suspend, rbtn_resume);
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static struct acpi_driver rbtn_driver = {
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.name = "dell-rbtn",
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.ids = rbtn_ids,
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.drv.pm = &rbtn_pm_ops,
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.ops = {
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.add = rbtn_add,
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.remove = rbtn_remove,
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.notify = rbtn_notify,
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},
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.owner = THIS_MODULE,
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};
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/*
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* notifier export functions
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*/
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static bool auto_remove_rfkill = true;
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static ATOMIC_NOTIFIER_HEAD(rbtn_chain_head);
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static int rbtn_inc_count(struct device *dev, void *data)
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{
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struct acpi_device *device = to_acpi_device(dev);
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struct rbtn_data *rbtn_data = device->driver_data;
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int *count = data;
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if (rbtn_data->type == RBTN_SLIDER)
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(*count)++;
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return 0;
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}
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static int rbtn_switch_dev(struct device *dev, void *data)
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{
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struct acpi_device *device = to_acpi_device(dev);
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struct rbtn_data *rbtn_data = device->driver_data;
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bool enable = data;
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if (rbtn_data->type != RBTN_SLIDER)
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return 0;
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if (enable)
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rbtn_rfkill_init(device);
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else
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rbtn_rfkill_exit(device);
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return 0;
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}
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int dell_rbtn_notifier_register(struct notifier_block *nb)
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{
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bool first;
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int count;
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int ret;
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count = 0;
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ret = driver_for_each_device(&rbtn_driver.drv, NULL, &count,
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rbtn_inc_count);
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if (ret || count == 0)
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return -ENODEV;
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first = !rbtn_chain_head.head;
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ret = atomic_notifier_chain_register(&rbtn_chain_head, nb);
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if (ret != 0)
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return ret;
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if (auto_remove_rfkill && first)
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ret = driver_for_each_device(&rbtn_driver.drv, NULL,
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(void *)false, rbtn_switch_dev);
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return ret;
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}
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EXPORT_SYMBOL_GPL(dell_rbtn_notifier_register);
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int dell_rbtn_notifier_unregister(struct notifier_block *nb)
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{
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int ret;
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ret = atomic_notifier_chain_unregister(&rbtn_chain_head, nb);
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if (ret != 0)
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return ret;
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if (auto_remove_rfkill && !rbtn_chain_head.head)
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ret = driver_for_each_device(&rbtn_driver.drv, NULL,
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(void *)true, rbtn_switch_dev);
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return ret;
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}
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EXPORT_SYMBOL_GPL(dell_rbtn_notifier_unregister);
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/*
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* acpi driver functions
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*/
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static int rbtn_add(struct acpi_device *device)
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{
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struct rbtn_data *rbtn_data;
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enum rbtn_type type;
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int ret = 0;
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type = rbtn_check(device);
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if (type == RBTN_UNKNOWN) {
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dev_info(&device->dev, "Unknown device type\n");
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return -EINVAL;
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}
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ret = rbtn_acquire(device, true);
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if (ret < 0) {
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dev_err(&device->dev, "Cannot enable device\n");
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return ret;
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}
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rbtn_data = devm_kzalloc(&device->dev, sizeof(*rbtn_data), GFP_KERNEL);
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if (!rbtn_data)
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return -ENOMEM;
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rbtn_data->type = type;
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device->driver_data = rbtn_data;
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switch (rbtn_data->type) {
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case RBTN_TOGGLE:
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ret = rbtn_input_init(rbtn_data);
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break;
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case RBTN_SLIDER:
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if (auto_remove_rfkill && rbtn_chain_head.head)
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ret = 0;
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else
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ret = rbtn_rfkill_init(device);
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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static int rbtn_remove(struct acpi_device *device)
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{
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struct rbtn_data *rbtn_data = device->driver_data;
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switch (rbtn_data->type) {
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case RBTN_TOGGLE:
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rbtn_input_exit(rbtn_data);
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break;
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case RBTN_SLIDER:
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rbtn_rfkill_exit(device);
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break;
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default:
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break;
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}
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rbtn_acquire(device, false);
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device->driver_data = NULL;
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return 0;
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}
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static void rbtn_notify(struct acpi_device *device, u32 event)
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{
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struct rbtn_data *rbtn_data = device->driver_data;
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/*
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* Some BIOSes send a notification at resume.
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* Ignore it to prevent unwanted input events.
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*/
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if (rbtn_data->suspended) {
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dev_dbg(&device->dev, "ACPI notification ignored\n");
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return;
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}
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if (event != 0x80) {
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dev_info(&device->dev, "Received unknown event (0x%x)\n",
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event);
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return;
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}
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switch (rbtn_data->type) {
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case RBTN_TOGGLE:
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rbtn_input_event(rbtn_data);
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break;
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case RBTN_SLIDER:
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rbtn_rfkill_event(device);
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atomic_notifier_call_chain(&rbtn_chain_head, event, device);
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break;
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default:
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break;
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}
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}
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/*
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* module functions
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*/
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module_acpi_driver(rbtn_driver);
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module_param(auto_remove_rfkill, bool, 0444);
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MODULE_PARM_DESC(auto_remove_rfkill, "Automatically remove rfkill devices when "
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"other modules start receiving events "
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"from this module and re-add them when "
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"the last module stops receiving events "
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"(default true)");
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MODULE_DEVICE_TABLE(acpi, rbtn_ids);
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MODULE_DESCRIPTION("Dell Airplane Mode Switch driver");
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MODULE_AUTHOR("Pali Rohár <pali@kernel.org>");
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MODULE_LICENSE("GPL");
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