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