intel-hid: new hid event driver for hotkeys

Message ID	1450337402-4178-1-git-send-email-alex.hung@canonical.com (mailing list archive)
State	Changes Requested, archived
Headers	show Return-Path: <platform-driver-x86-owner@kernel.org> From: Alex Hung <alex.hung@canonical.com> To: dvhart@infradead.org, platform-driver-x86@vger.kernel.org, alex.hung@canonical.com Cc: luto@amacapital.net Subject: [PATCH] intel-hid: new hid event driver for hotkeys Date: Thu, 17 Dec 2015 15:30:02 +0800 Message-Id: <1450337402-4178-1-git-send-email-alex.hung@canonical.com> Sender: platform-driver-x86-owner@vger.kernel.org Precedence: bulk

diff --git a/MAINTAINERS b/MAINTAINERS index 9bff63c..083b704 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -5502,6 +5502,12 @@ T: git git://git.code.sf.net/p/intel-sas/isci S: Supported F: drivers/scsi/isci/ +INTEL HID EVENT FILTER DRIVER +M: Alex Hung <alex.hung@canonical.com> +L: platform-driver-x86@vger.kernel.org +S: Maintained +F: drivers/platform/x86/intel-hid.c + INTEL IDLE DRIVER M: Len Brown <lenb@kernel.org> L: linux-pm@vger.kernel.org diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index 1089eaa..9d31221 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -731,6 +731,17 @@ config ACPI_CMPC keys as input device, backlight device, tablet and accelerometer devices. +config INTEL_HID_EVENT + tristate "INTEL HID Event Filter" + depends on ACPI + depends on INPUT + help + This driver provides supports for Intel HID event. Some laptops + require this driver for hotkey supports. + + To compile this driver as a module, choose M here: the module will + be called intel_hid. + config INTEL_SCU_IPC bool "Intel SCU IPC Support" depends on X86_INTEL_MID diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile index 3ca78a3..c7766a4 100644 --- a/drivers/platform/x86/Makefile +++ b/drivers/platform/x86/Makefile @@ -41,6 +41,7 @@ obj-$(CONFIG_ACPI_TOSHIBA) += toshiba_acpi.o obj-$(CONFIG_TOSHIBA_BT_RFKILL) += toshiba_bluetooth.o obj-$(CONFIG_TOSHIBA_HAPS) += toshiba_haps.o obj-$(CONFIG_TOSHIBA_WMI) += toshiba-wmi.o +obj-$(CONFIG_INTEL_HID_EVENT) += intel-hid.o obj-$(CONFIG_INTEL_SCU_IPC) += intel_scu_ipc.o obj-$(CONFIG_INTEL_SCU_IPC_UTIL) += intel_scu_ipcutil.o obj-$(CONFIG_INTEL_MFLD_THERMAL) += intel_mid_thermal.o diff --git a/drivers/platform/x86/intel-hid.c b/drivers/platform/x86/intel-hid.c new file mode 100644 index 0000000..02292ac --- /dev/null +++ b/drivers/platform/x86/intel-hid.c @@ -0,0 +1,289 @@ +/* + * Intel HID event filter driver for Windows 8 + * + * Copyright (C) 2015 Alex Hung <alex.hung@canonical.com> + * Copyright (C) 2015 Andrew Lutomirski <luto@kernel.org> + * + * 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/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/input.h> +#include <linux/platform_device.h> +#include <linux/input/sparse-keymap.h> +#include <linux/acpi.h> +#include <acpi/acpi_bus.h> + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Alex Hung"); + +static const struct acpi_device_id intel_hid_ids[] = { + {"INT33D5", 0}, + {"", 0}, +}; + +/* In theory, these are HID usages. */ +static const struct key_entry intel_hid_keymap[] = { + /* 1: LSuper (Page 0x07, usage 0xE3) -- unclear what to do */ + /* 2: Toggle SW_ROTATE_LOCK -- easy to implement if seen in wild */ + { KE_KEY, 3, { KEY_NUMLOCK } }, + { KE_KEY, 4, { KEY_HOME } }, + { KE_KEY, 5, { KEY_END } }, + { KE_KEY, 6, { KEY_PAGEUP } }, + { KE_KEY, 4, { KEY_PAGEDOWN } }, + { KE_KEY, 4, { KEY_HOME } }, + { KE_KEY, 8, { KEY_RFKILL } }, + { KE_KEY, 9, { KEY_POWER } }, + { KE_KEY, 11, { KEY_SLEEP } }, + /* 13 has two different meanings in the spec -- ignore it. */ + { KE_KEY, 14, { KEY_STOPCD } }, + { KE_KEY, 15, { KEY_PLAYPAUSE } }, + { KE_KEY, 16, { KEY_MUTE } }, + { KE_KEY, 17, { KEY_VOLUMEUP } }, + { KE_KEY, 18, { KEY_VOLUMEDOWN } }, + { KE_KEY, 19, { KEY_BRIGHTNESSUP } }, + { KE_KEY, 20, { KEY_BRIGHTNESSDOWN } }, + /* 27: wake -- needs special handling */ + { KE_END }, +}; + +struct intel_hid_priv { + struct input_dev *input_dev; +}; + +static int intel_hid_set_enable(struct device *device, int enable) +{ + union acpi_object arg0 = { ACPI_TYPE_INTEGER }; + struct acpi_object_list args = { 1, &arg0 }; + acpi_status status; + + arg0.integer.value = enable; + status = acpi_evaluate_object(ACPI_HANDLE(device), "HDSM", &args, NULL); + if (!ACPI_SUCCESS(status)) { + dev_warn(device, "failed to %sable hotkeys\n", + enable ? "en" : "dis"); + return -EIO; + } + + return 0; +} + +static int intel_hid_pl_suspend_handler(struct device *device) +{ + intel_hid_set_enable(device, 0); + return 0; +} + +static int intel_hid_pl_resume_handler(struct device *device) +{ + intel_hid_set_enable(device, 1); + return 0; +} + +static const struct dev_pm_ops intel_hid_pl_pm_ops = { + .suspend = intel_hid_pl_suspend_handler, + .resume = intel_hid_pl_resume_handler, +}; + +static int intel_hid_input_setup(struct platform_device *device) +{ + struct intel_hid_priv *priv = dev_get_drvdata(&device->dev); + int ret; + + priv->input_dev = input_allocate_device(); + if (!priv->input_dev) + return -ENOMEM; + + ret = sparse_keymap_setup(priv->input_dev, intel_hid_keymap, NULL); + if (ret) + goto err_free_device; + + priv->input_dev->dev.parent = &device->dev; + priv->input_dev->name = "Intel HID events"; + priv->input_dev->id.bustype = BUS_HOST; + set_bit(KEY_RFKILL, priv->input_dev->keybit); + + ret = input_register_device(priv->input_dev); + if (ret) + goto err_free_device; + + return 0; + +err_free_device: + input_free_device(priv->input_dev); + return ret; +} + +static void intel_hid_input_destroy(struct platform_device *device) +{ + struct intel_hid_priv *priv = dev_get_drvdata(&device->dev); + + input_unregister_device(priv->input_dev); +} + +static void notify_handler(acpi_handle handle, u32 event, void *context) +{ + struct platform_device *device = context; + struct intel_hid_priv *priv = dev_get_drvdata(&device->dev); + unsigned long long ev_index; + acpi_status status; + + /* The platform spec only defines one event code: 0xC0. */ + if (event != 0xc0) { + dev_warn(&device->dev, "received unknown event (0x%x)\n", + event); + return; + } + + status = acpi_evaluate_integer(handle, "HDEM", NULL, &ev_index); + if (!ACPI_SUCCESS(status)) { + dev_warn(&device->dev, "failed to get event index\n"); + return; + } + + if (!sparse_keymap_report_event(priv->input_dev, ev_index, 1, true)) + dev_info(&device->dev, "unknown event index 0x%llx\n", + ev_index); +} + +static int intel_hid_probe(struct platform_device *device) +{ + acpi_handle handle = ACPI_HANDLE(&device->dev); + struct intel_hid_priv *priv; + unsigned long long mode; + acpi_status status; + int err; + + status = acpi_evaluate_integer(handle, "HDMM", NULL, &mode); + if (!ACPI_SUCCESS(status)) { + dev_warn(&device->dev, "failed to read mode\n"); + return -ENODEV; + } + + if (mode != 0) { + /* + * This driver only implements "simple" mode. There appear + * to be no other modes, but we should be paranoid and check + * for compatibility. + */ + dev_info(&device->dev, "platform is not in simple mode\n"); + return -ENODEV; + } + + priv = devm_kzalloc(&device->dev, + sizeof(struct intel_hid_priv *), GFP_KERNEL); + if (!priv) + return -ENOMEM; + dev_set_drvdata(&device->dev, priv); + + err = intel_hid_input_setup(device); + if (err) { + pr_err("Failed to setup Intel HID hotkeys\n"); + return err; + } + + status = acpi_install_notify_handler(handle, + ACPI_DEVICE_NOTIFY, + notify_handler, + device); + if (ACPI_FAILURE(status)) { + err = -EBUSY; + goto err_remove_input; + } + + err = intel_hid_set_enable(&device->dev, 1); + if (err) + goto err_remove_notify; + + return 0; + +err_remove_notify: + acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler); + +err_remove_input: + intel_hid_input_destroy(device); + + return err; +} + +static int intel_hid_remove(struct platform_device *device) +{ + acpi_handle handle = ACPI_HANDLE(&device->dev); + + acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler); + intel_hid_input_destroy(device); + intel_hid_set_enable(&device->dev, 0); + acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler); + + /* + * Even if we failed to shut off the event stream, we can still + * safely detach from the device. + */ + return 0; +} + +static struct platform_driver intel_hid_pl_driver = { + .driver = { + .name = "intel-hid", + .acpi_match_table = intel_hid_ids, + .pm = &intel_hid_pl_pm_ops, + }, + .probe = intel_hid_probe, + .remove = intel_hid_remove, +}; +MODULE_DEVICE_TABLE(acpi, intel_hid_ids); + +/* + * Unfortunately, some laptops provide a _HID="INT33D5" device with + * _CID="PNP0C02". This causes the pnpacpi scan driver to claim the + * ACPI node, so no platform device will be created. The pnpacpi + * driver rejects this device in subsequent processing, so no physical + * node is created at all. + * + * As a workaround until the ACPI core figures out how to handle + * this corner case, manually ask the ACPI platform device code to + * claim the ACPI node. + */ +static acpi_status __init +check_acpi_dev(acpi_handle handle, u32 lvl, void *context, void **rv) +{ + const struct acpi_device_id *ids = context; + struct acpi_device *dev; + + if (acpi_bus_get_device(handle, &dev) != 0) + return AE_OK; + + if (acpi_match_device_ids(dev, ids) == 0) + if (acpi_create_platform_device(dev)) + dev_info(&dev->dev, + "intel-hid: created platform device\n"); + + return AE_OK; +} + +static int __init intel_hid_init(void) +{ + acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, + ACPI_UINT32_MAX, check_acpi_dev, NULL, + (void *)intel_hid_ids, NULL); + + return platform_driver_register(&intel_hid_pl_driver); +} +module_init(intel_hid_init); + +static void __exit intel_hid_exit(void) +{ + platform_driver_unregister(&intel_hid_pl_driver); +} +module_exit(intel_hid_exit);

intel-hid: new hid event driver for hotkeys

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