diff options
author | Pali Rohár <pali.rohar@gmail.com> | 2015-06-06 08:23:28 (GMT) |
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committer | Darren Hart <dvhart@linux.intel.com> | 2015-06-11 05:03:15 (GMT) |
commit | 817a5cdb40c8115eafe631b8e1de37cf8fe9fab8 (patch) | |
tree | 6c8ff02713538c4eccf69e5cc76864db15b6cdf1 /drivers/platform/x86/dell-rbtn.c | |
parent | 9330dcdd918a5724af8321127a19a1b171df6bab (diff) | |
download | linux-817a5cdb40c8115eafe631b8e1de37cf8fe9fab8.tar.xz |
dell-rbtn: Dell Airplane Mode Switch driver
This is an ACPI driver for Dell laptops which receive HW slider radio
switch or hotkey toggle wifi button events. It exports rfkill device
dell-rbtn (which provide correct hard rfkill state) or hotkey input device.
Alex Hung is author of original hotkey input device code.
Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
Tested-by: Gabriele Mazzotta <gabriele.mzt@gmail.com>
Cc: Alex Hung <alex.hung@canonical.com>
[fengguang.wu@intel.com: rbtn_ops can be static]
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
[dvhart@linux.intel.com: Correct multi-line comment formatting]
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
Diffstat (limited to 'drivers/platform/x86/dell-rbtn.c')
-rw-r--r-- | drivers/platform/x86/dell-rbtn.c | 332 |
1 files changed, 332 insertions, 0 deletions
diff --git a/drivers/platform/x86/dell-rbtn.c b/drivers/platform/x86/dell-rbtn.c new file mode 100644 index 0000000..1c19fff --- /dev/null +++ b/drivers/platform/x86/dell-rbtn.c @@ -0,0 +1,332 @@ +/* + Dell Airplane Mode Switch driver + Copyright (C) 2014-2015 Pali Rohár <pali.rohar@gmail.com> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. +*/ + +#include <linux/module.h> +#include <linux/acpi.h> +#include <linux/rfkill.h> +#include <linux/input.h> + +enum rbtn_type { + RBTN_UNKNOWN, + RBTN_TOGGLE, + RBTN_SLIDER, +}; + +struct rbtn_data { + enum rbtn_type type; + struct rfkill *rfkill; + struct input_dev *input_dev; +}; + + +/* + * acpi functions + */ + +static enum rbtn_type rbtn_check(struct acpi_device *device) +{ + unsigned long long output; + acpi_status status; + + status = acpi_evaluate_integer(device->handle, "CRBT", NULL, &output); + if (ACPI_FAILURE(status)) + return RBTN_UNKNOWN; + + switch (output) { + case 0: + case 1: + return RBTN_TOGGLE; + case 2: + case 3: + return RBTN_SLIDER; + default: + return RBTN_UNKNOWN; + } +} + +static int rbtn_get(struct acpi_device *device) +{ + unsigned long long output; + acpi_status status; + + status = acpi_evaluate_integer(device->handle, "GRBT", NULL, &output); + if (ACPI_FAILURE(status)) + return -EINVAL; + + return !output; +} + +static int rbtn_acquire(struct acpi_device *device, bool enable) +{ + struct acpi_object_list input; + union acpi_object param; + acpi_status status; + + param.type = ACPI_TYPE_INTEGER; + param.integer.value = enable; + input.count = 1; + input.pointer = ¶m; + + status = acpi_evaluate_object(device->handle, "ARBT", &input, NULL); + if (ACPI_FAILURE(status)) + return -EINVAL; + + return 0; +} + + +/* + * rfkill device + */ + +static void rbtn_rfkill_query(struct rfkill *rfkill, void *data) +{ + struct acpi_device *device = data; + int state; + + state = rbtn_get(device); + if (state < 0) + return; + + rfkill_set_states(rfkill, state, state); +} + +static int rbtn_rfkill_set_block(void *data, bool blocked) +{ + /* NOTE: setting soft rfkill state is not supported */ + return -EINVAL; +} + +static struct rfkill_ops rbtn_ops = { + .query = rbtn_rfkill_query, + .set_block = rbtn_rfkill_set_block, +}; + +static int rbtn_rfkill_init(struct acpi_device *device) +{ + struct rbtn_data *rbtn_data = device->driver_data; + int ret; + + if (rbtn_data->rfkill) + return 0; + + /* + * NOTE: rbtn controls all radio devices, not only WLAN + * but rfkill interface does not support "ANY" type + * so "WLAN" type is used + */ + rbtn_data->rfkill = rfkill_alloc("dell-rbtn", &device->dev, + RFKILL_TYPE_WLAN, &rbtn_ops, device); + if (!rbtn_data->rfkill) + return -ENOMEM; + + ret = rfkill_register(rbtn_data->rfkill); + if (ret) { + rfkill_destroy(rbtn_data->rfkill); + rbtn_data->rfkill = NULL; + return ret; + } + + return 0; +} + +static void rbtn_rfkill_exit(struct acpi_device *device) +{ + struct rbtn_data *rbtn_data = device->driver_data; + + if (!rbtn_data->rfkill) + return; + + rfkill_unregister(rbtn_data->rfkill); + rfkill_destroy(rbtn_data->rfkill); + rbtn_data->rfkill = NULL; +} + +static void rbtn_rfkill_event(struct acpi_device *device) +{ + struct rbtn_data *rbtn_data = device->driver_data; + + if (rbtn_data->rfkill) + rbtn_rfkill_query(rbtn_data->rfkill, device); +} + + +/* + * input device + */ + +static int rbtn_input_init(struct rbtn_data *rbtn_data) +{ + int ret; + + rbtn_data->input_dev = input_allocate_device(); + if (!rbtn_data->input_dev) + return -ENOMEM; + + rbtn_data->input_dev->name = "DELL Wireless hotkeys"; + rbtn_data->input_dev->phys = "dellabce/input0"; + rbtn_data->input_dev->id.bustype = BUS_HOST; + rbtn_data->input_dev->evbit[0] = BIT(EV_KEY); + set_bit(KEY_RFKILL, rbtn_data->input_dev->keybit); + + ret = input_register_device(rbtn_data->input_dev); + if (ret) { + input_free_device(rbtn_data->input_dev); + rbtn_data->input_dev = NULL; + return ret; + } + + return 0; +} + +static void rbtn_input_exit(struct rbtn_data *rbtn_data) +{ + input_unregister_device(rbtn_data->input_dev); + rbtn_data->input_dev = NULL; +} + +static void rbtn_input_event(struct rbtn_data *rbtn_data) +{ + input_report_key(rbtn_data->input_dev, KEY_RFKILL, 1); + input_sync(rbtn_data->input_dev); + input_report_key(rbtn_data->input_dev, KEY_RFKILL, 0); + input_sync(rbtn_data->input_dev); +} + + +/* + * acpi driver + */ + +static int rbtn_add(struct acpi_device *device); +static int rbtn_remove(struct acpi_device *device); +static void rbtn_notify(struct acpi_device *device, u32 event); + +static const struct acpi_device_id rbtn_ids[] = { + { "DELRBTN", 0 }, + { "DELLABCE", 0 }, + { "", 0 }, +}; + +static struct acpi_driver rbtn_driver = { + .name = "dell-rbtn", + .ids = rbtn_ids, + .ops = { + .add = rbtn_add, + .remove = rbtn_remove, + .notify = rbtn_notify, + }, + .owner = THIS_MODULE, +}; + + +/* + * acpi driver functions + */ + +static int rbtn_add(struct acpi_device *device) +{ + struct rbtn_data *rbtn_data; + enum rbtn_type type; + int ret = 0; + + type = rbtn_check(device); + if (type == RBTN_UNKNOWN) { + dev_info(&device->dev, "Unknown device type\n"); + return -EINVAL; + } + + ret = rbtn_acquire(device, true); + if (ret < 0) { + dev_err(&device->dev, "Cannot enable device\n"); + return ret; + } + + rbtn_data = devm_kzalloc(&device->dev, sizeof(*rbtn_data), GFP_KERNEL); + if (!rbtn_data) + return -ENOMEM; + + rbtn_data->type = type; + device->driver_data = rbtn_data; + + switch (rbtn_data->type) { + case RBTN_TOGGLE: + ret = rbtn_input_init(rbtn_data); + break; + case RBTN_SLIDER: + ret = rbtn_rfkill_init(device); + break; + default: + ret = -EINVAL; + } + + return ret; + +} + +static int rbtn_remove(struct acpi_device *device) +{ + struct rbtn_data *rbtn_data = device->driver_data; + + switch (rbtn_data->type) { + case RBTN_TOGGLE: + rbtn_input_exit(rbtn_data); + break; + case RBTN_SLIDER: + rbtn_rfkill_exit(device); + break; + default: + break; + } + + rbtn_acquire(device, false); + device->driver_data = NULL; + + return 0; +} + +static void rbtn_notify(struct acpi_device *device, u32 event) +{ + struct rbtn_data *rbtn_data = device->driver_data; + + if (event != 0x80) { + dev_info(&device->dev, "Received unknown event (0x%x)\n", + event); + return; + } + + switch (rbtn_data->type) { + case RBTN_TOGGLE: + rbtn_input_event(rbtn_data); + break; + case RBTN_SLIDER: + rbtn_rfkill_event(device); + break; + default: + break; + } +} + + +/* + * module functions + */ + +module_acpi_driver(rbtn_driver); + +MODULE_DEVICE_TABLE(acpi, rbtn_ids); +MODULE_DESCRIPTION("Dell Airplane Mode Switch driver"); +MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>"); +MODULE_LICENSE("GPL"); |