1b33752c3SDouglas Anderson /* 2b33752c3SDouglas Anderson * HID over I2C ACPI Subclass 3b33752c3SDouglas Anderson * 4b33752c3SDouglas Anderson * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com> 5b33752c3SDouglas Anderson * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France 6b33752c3SDouglas Anderson * Copyright (c) 2012 Red Hat, Inc 7b33752c3SDouglas Anderson * 8b33752c3SDouglas Anderson * This code was forked out of the core code, which was partly based on 9b33752c3SDouglas Anderson * "USB HID support for Linux": 10b33752c3SDouglas Anderson * 11b33752c3SDouglas Anderson * Copyright (c) 1999 Andreas Gal 12b33752c3SDouglas Anderson * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz> 13b33752c3SDouglas Anderson * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc 14b33752c3SDouglas Anderson * Copyright (c) 2007-2008 Oliver Neukum 15b33752c3SDouglas Anderson * Copyright (c) 2006-2010 Jiri Kosina 16b33752c3SDouglas Anderson * 17b33752c3SDouglas Anderson * This file is subject to the terms and conditions of the GNU General Public 18b33752c3SDouglas Anderson * License. See the file COPYING in the main directory of this archive for 19b33752c3SDouglas Anderson * more details. 20b33752c3SDouglas Anderson */ 21b33752c3SDouglas Anderson 22b33752c3SDouglas Anderson #include <linux/acpi.h> 23b33752c3SDouglas Anderson #include <linux/device.h> 24b33752c3SDouglas Anderson #include <linux/i2c.h> 25b33752c3SDouglas Anderson #include <linux/kernel.h> 26b33752c3SDouglas Anderson #include <linux/module.h> 27b33752c3SDouglas Anderson #include <linux/pm.h> 28a3836a02SAndy Shevchenko #include <linux/uuid.h> 29b33752c3SDouglas Anderson 30b33752c3SDouglas Anderson #include "i2c-hid.h" 31b33752c3SDouglas Anderson 32b33752c3SDouglas Anderson struct i2c_hid_acpi { 33b33752c3SDouglas Anderson struct i2chid_ops ops; 346d97010eSAndy Shevchenko struct acpi_device *adev; 35b33752c3SDouglas Anderson }; 36b33752c3SDouglas Anderson 37b33752c3SDouglas Anderson static const struct acpi_device_id i2c_hid_acpi_blacklist[] = { 38b33752c3SDouglas Anderson /* 39b33752c3SDouglas Anderson * The CHPN0001 ACPI device, which is used to describe the Chipone 40b33752c3SDouglas Anderson * ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible. 41b33752c3SDouglas Anderson */ 424122abfeSAndy Shevchenko { "CHPN0001" }, 434122abfeSAndy Shevchenko { } 44b33752c3SDouglas Anderson }; 45b33752c3SDouglas Anderson 46a3836a02SAndy Shevchenko /* HID I²C Device: 3cdff6f7-4267-4555-ad05-b30a3d8938de */ 47b33752c3SDouglas Anderson static guid_t i2c_hid_guid = 48b33752c3SDouglas Anderson GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555, 49b33752c3SDouglas Anderson 0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE); 50a3836a02SAndy Shevchenko 51572eaeb7SAndy Shevchenko static int i2c_hid_acpi_get_descriptor(struct i2c_hid_acpi *ihid_acpi) 52a3836a02SAndy Shevchenko { 53572eaeb7SAndy Shevchenko struct acpi_device *adev = ihid_acpi->adev; 546d97010eSAndy Shevchenko acpi_handle handle = acpi_device_handle(adev); 55b33752c3SDouglas Anderson union acpi_object *obj; 56b33752c3SDouglas Anderson u16 hid_descriptor_address; 57b33752c3SDouglas Anderson 58b33752c3SDouglas Anderson if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0) 59b33752c3SDouglas Anderson return -ENODEV; 60b33752c3SDouglas Anderson 61b33752c3SDouglas Anderson obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL, 62b33752c3SDouglas Anderson ACPI_TYPE_INTEGER); 63b33752c3SDouglas Anderson if (!obj) { 646d97010eSAndy Shevchenko acpi_handle_err(handle, "Error _DSM call to get HID descriptor address failed\n"); 65b33752c3SDouglas Anderson return -ENODEV; 66b33752c3SDouglas Anderson } 67b33752c3SDouglas Anderson 68b33752c3SDouglas Anderson hid_descriptor_address = obj->integer.value; 69b33752c3SDouglas Anderson ACPI_FREE(obj); 70b33752c3SDouglas Anderson 71b33752c3SDouglas Anderson return hid_descriptor_address; 72b33752c3SDouglas Anderson } 73b33752c3SDouglas Anderson 74b33752c3SDouglas Anderson static void i2c_hid_acpi_shutdown_tail(struct i2chid_ops *ops) 75b33752c3SDouglas Anderson { 766d97010eSAndy Shevchenko struct i2c_hid_acpi *ihid_acpi = container_of(ops, struct i2c_hid_acpi, ops); 776d97010eSAndy Shevchenko 786d97010eSAndy Shevchenko acpi_device_set_power(ihid_acpi->adev, ACPI_STATE_D3_COLD); 79b33752c3SDouglas Anderson } 80b33752c3SDouglas Anderson 814cecff8fSAndy Shevchenko static int i2c_hid_acpi_probe(struct i2c_client *client) 82b33752c3SDouglas Anderson { 83b33752c3SDouglas Anderson struct device *dev = &client->dev; 84b33752c3SDouglas Anderson struct i2c_hid_acpi *ihid_acpi; 85b33752c3SDouglas Anderson u16 hid_descriptor_address; 86b33752c3SDouglas Anderson int ret; 87b33752c3SDouglas Anderson 88b33752c3SDouglas Anderson ihid_acpi = devm_kzalloc(&client->dev, sizeof(*ihid_acpi), GFP_KERNEL); 89b33752c3SDouglas Anderson if (!ihid_acpi) 90b33752c3SDouglas Anderson return -ENOMEM; 91b33752c3SDouglas Anderson 92572eaeb7SAndy Shevchenko ihid_acpi->adev = ACPI_COMPANION(dev); 93b33752c3SDouglas Anderson ihid_acpi->ops.shutdown_tail = i2c_hid_acpi_shutdown_tail; 94b33752c3SDouglas Anderson 95572eaeb7SAndy Shevchenko ret = i2c_hid_acpi_get_descriptor(ihid_acpi); 96b33752c3SDouglas Anderson if (ret < 0) 97b33752c3SDouglas Anderson return ret; 98b33752c3SDouglas Anderson hid_descriptor_address = ret; 99b33752c3SDouglas Anderson 100572eaeb7SAndy Shevchenko acpi_device_fix_up_power(ihid_acpi->adev); 101b33752c3SDouglas Anderson 102b33752c3SDouglas Anderson return i2c_hid_core_probe(client, &ihid_acpi->ops, 103b60d3c80SAlistair Francis hid_descriptor_address, 0); 104b33752c3SDouglas Anderson } 105b33752c3SDouglas Anderson 106b33752c3SDouglas Anderson static const struct acpi_device_id i2c_hid_acpi_match[] = { 1074122abfeSAndy Shevchenko { "ACPI0C50" }, 1084122abfeSAndy Shevchenko { "PNP0C50" }, 1094122abfeSAndy Shevchenko { } 110b33752c3SDouglas Anderson }; 111b33752c3SDouglas Anderson MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match); 112b33752c3SDouglas Anderson 113b33752c3SDouglas Anderson static struct i2c_driver i2c_hid_acpi_driver = { 114b33752c3SDouglas Anderson .driver = { 115b33752c3SDouglas Anderson .name = "i2c_hid_acpi", 116b33752c3SDouglas Anderson .pm = &i2c_hid_core_pm, 117b33752c3SDouglas Anderson .probe_type = PROBE_PREFER_ASYNCHRONOUS, 11809609410SAndy Shevchenko .acpi_match_table = i2c_hid_acpi_match, 119b33752c3SDouglas Anderson }, 120b33752c3SDouglas Anderson 121*e4b88075SUwe Kleine-König .probe = i2c_hid_acpi_probe, 122b33752c3SDouglas Anderson .remove = i2c_hid_core_remove, 123b33752c3SDouglas Anderson .shutdown = i2c_hid_core_shutdown, 124b33752c3SDouglas Anderson }; 125b33752c3SDouglas Anderson 126b33752c3SDouglas Anderson module_i2c_driver(i2c_hid_acpi_driver); 127b33752c3SDouglas Anderson 128b33752c3SDouglas Anderson MODULE_DESCRIPTION("HID over I2C ACPI driver"); 129b33752c3SDouglas Anderson MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>"); 130b33752c3SDouglas Anderson MODULE_LICENSE("GPL"); 131