| /* |
| * HID over I2C ACPI Subclass |
| * |
| * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com> |
| * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France |
| * Copyright (c) 2012 Red Hat, Inc |
| * |
| * This code was forked out of the core code, which was partly based on |
| * "USB HID support for Linux": |
| * |
| * Copyright (c) 1999 Andreas Gal |
| * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz> |
| * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc |
| * Copyright (c) 2007-2008 Oliver Neukum |
| * Copyright (c) 2006-2010 Jiri Kosina |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file COPYING in the main directory of this archive for |
| * more details. |
| */ |
| |
| #include <linux/acpi.h> |
| #include <linux/device.h> |
| #include <linux/i2c.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/pm.h> |
| #include <linux/uuid.h> |
| |
| #include "i2c-hid.h" |
| |
| struct i2c_hid_acpi { |
| struct i2chid_ops ops; |
| struct acpi_device *adev; |
| }; |
| |
| static const struct acpi_device_id i2c_hid_acpi_blacklist[] = { |
| /* |
| * The CHPN0001 ACPI device, which is used to describe the Chipone |
| * ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible. |
| */ |
| {"CHPN0001", 0 }, |
| { }, |
| }; |
| |
| /* HID I²C Device: 3cdff6f7-4267-4555-ad05-b30a3d8938de */ |
| static guid_t i2c_hid_guid = |
| GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555, |
| 0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE); |
| |
| static int i2c_hid_acpi_get_descriptor(struct acpi_device *adev) |
| { |
| acpi_handle handle = acpi_device_handle(adev); |
| union acpi_object *obj; |
| u16 hid_descriptor_address; |
| |
| if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0) |
| return -ENODEV; |
| |
| obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL, |
| ACPI_TYPE_INTEGER); |
| if (!obj) { |
| acpi_handle_err(handle, "Error _DSM call to get HID descriptor address failed\n"); |
| return -ENODEV; |
| } |
| |
| hid_descriptor_address = obj->integer.value; |
| ACPI_FREE(obj); |
| |
| return hid_descriptor_address; |
| } |
| |
| static void i2c_hid_acpi_shutdown_tail(struct i2chid_ops *ops) |
| { |
| struct i2c_hid_acpi *ihid_acpi = container_of(ops, struct i2c_hid_acpi, ops); |
| |
| acpi_device_set_power(ihid_acpi->adev, ACPI_STATE_D3_COLD); |
| } |
| |
| static int i2c_hid_acpi_probe(struct i2c_client *client) |
| { |
| struct device *dev = &client->dev; |
| struct i2c_hid_acpi *ihid_acpi; |
| struct acpi_device *adev; |
| u16 hid_descriptor_address; |
| int ret; |
| |
| adev = ACPI_COMPANION(dev); |
| if (!adev) { |
| dev_err(&client->dev, "Error could not get ACPI device\n"); |
| return -ENODEV; |
| } |
| |
| ihid_acpi = devm_kzalloc(&client->dev, sizeof(*ihid_acpi), GFP_KERNEL); |
| if (!ihid_acpi) |
| return -ENOMEM; |
| |
| ihid_acpi->adev = adev; |
| ihid_acpi->ops.shutdown_tail = i2c_hid_acpi_shutdown_tail; |
| |
| ret = i2c_hid_acpi_get_descriptor(adev); |
| if (ret < 0) |
| return ret; |
| hid_descriptor_address = ret; |
| |
| acpi_device_fix_up_power(adev); |
| |
| if (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0) { |
| device_set_wakeup_capable(dev, true); |
| device_set_wakeup_enable(dev, false); |
| } |
| |
| return i2c_hid_core_probe(client, &ihid_acpi->ops, |
| hid_descriptor_address); |
| } |
| |
| static const struct acpi_device_id i2c_hid_acpi_match[] = { |
| {"ACPI0C50", 0 }, |
| {"PNP0C50", 0 }, |
| { }, |
| }; |
| MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match); |
| |
| static struct i2c_driver i2c_hid_acpi_driver = { |
| .driver = { |
| .name = "i2c_hid_acpi", |
| .pm = &i2c_hid_core_pm, |
| .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
| .acpi_match_table = i2c_hid_acpi_match, |
| }, |
| |
| .probe_new = i2c_hid_acpi_probe, |
| .remove = i2c_hid_core_remove, |
| .shutdown = i2c_hid_core_shutdown, |
| }; |
| |
| module_i2c_driver(i2c_hid_acpi_driver); |
| |
| MODULE_DESCRIPTION("HID over I2C ACPI driver"); |
| MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>"); |
| MODULE_LICENSE("GPL"); |