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499 lines
10 KiB
499 lines
10 KiB
// 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 <[email protected]> |
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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 <[email protected]>"); |
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MODULE_LICENSE("GPL");
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