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| 1 | +/* |
| 2 | + * HID over I2C ACPI Subclass |
| 3 | + * |
| 4 | + * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com> |
| 5 | + * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France |
| 6 | + * Copyright (c) 2012 Red Hat, Inc |
| 7 | + * |
| 8 | + * This code was forked out of the core code, which was partly based on |
| 9 | + * "USB HID support for Linux": |
| 10 | + * |
| 11 | + * Copyright (c) 1999 Andreas Gal |
| 12 | + * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz> |
| 13 | + * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc |
| 14 | + * Copyright (c) 2007-2008 Oliver Neukum |
| 15 | + * Copyright (c) 2006-2010 Jiri Kosina |
| 16 | + * |
| 17 | + * This file is subject to the terms and conditions of the GNU General Public |
| 18 | + * License. See the file COPYING in the main directory of this archive for |
| 19 | + * more details. |
| 20 | + */ |
| 21 | + |
| 22 | +#include <linux/acpi.h> |
| 23 | +#include <linux/device.h> |
| 24 | +#include <linux/i2c.h> |
| 25 | +#include <linux/kernel.h> |
| 26 | +#include <linux/module.h> |
| 27 | +#include <linux/pm.h> |
| 28 | + |
| 29 | +#include "i2c-hid.h" |
| 30 | + |
| 31 | +struct i2c_hid_acpi { |
| 32 | + struct i2chid_ops ops; |
| 33 | + struct i2c_client *client; |
| 34 | +}; |
| 35 | + |
| 36 | +static const struct acpi_device_id i2c_hid_acpi_blacklist[] = { |
| 37 | + /* |
| 38 | + * The CHPN0001 ACPI device, which is used to describe the Chipone |
| 39 | + * ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible. |
| 40 | + */ |
| 41 | + {"CHPN0001", 0 }, |
| 42 | + { }, |
| 43 | +}; |
| 44 | + |
| 45 | +static int i2c_hid_acpi_get_descriptor(struct i2c_client *client) |
| 46 | +{ |
| 47 | + static guid_t i2c_hid_guid = |
| 48 | + GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555, |
| 49 | + 0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE); |
| 50 | + union acpi_object *obj; |
| 51 | + struct acpi_device *adev; |
| 52 | + acpi_handle handle; |
| 53 | + u16 hid_descriptor_address; |
| 54 | + |
| 55 | + handle = ACPI_HANDLE(&client->dev); |
| 56 | + if (!handle || acpi_bus_get_device(handle, &adev)) { |
| 57 | + dev_err(&client->dev, "Error could not get ACPI device\n"); |
| 58 | + return -ENODEV; |
| 59 | + } |
| 60 | + |
| 61 | + if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0) |
| 62 | + return -ENODEV; |
| 63 | + |
| 64 | + obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL, |
| 65 | + ACPI_TYPE_INTEGER); |
| 66 | + if (!obj) { |
| 67 | + dev_err(&client->dev, "Error _DSM call to get HID descriptor address failed\n"); |
| 68 | + return -ENODEV; |
| 69 | + } |
| 70 | + |
| 71 | + hid_descriptor_address = obj->integer.value; |
| 72 | + ACPI_FREE(obj); |
| 73 | + |
| 74 | + return hid_descriptor_address; |
| 75 | +} |
| 76 | + |
| 77 | +static void i2c_hid_acpi_shutdown_tail(struct i2chid_ops *ops) |
| 78 | +{ |
| 79 | + struct i2c_hid_acpi *ihid_acpi = |
| 80 | + container_of(ops, struct i2c_hid_acpi, ops); |
| 81 | + struct device *dev = &ihid_acpi->client->dev; |
| 82 | + acpi_device_set_power(ACPI_COMPANION(dev), ACPI_STATE_D3_COLD); |
| 83 | +} |
| 84 | + |
| 85 | +static int i2c_hid_acpi_probe(struct i2c_client *client, |
| 86 | + const struct i2c_device_id *dev_id) |
| 87 | +{ |
| 88 | + struct device *dev = &client->dev; |
| 89 | + struct i2c_hid_acpi *ihid_acpi; |
| 90 | + struct acpi_device *adev; |
| 91 | + u16 hid_descriptor_address; |
| 92 | + int ret; |
| 93 | + |
| 94 | + ihid_acpi = devm_kzalloc(&client->dev, sizeof(*ihid_acpi), GFP_KERNEL); |
| 95 | + if (!ihid_acpi) |
| 96 | + return -ENOMEM; |
| 97 | + |
| 98 | + ihid_acpi->client = client; |
| 99 | + ihid_acpi->ops.shutdown_tail = i2c_hid_acpi_shutdown_tail; |
| 100 | + |
| 101 | + ret = i2c_hid_acpi_get_descriptor(client); |
| 102 | + if (ret < 0) |
| 103 | + return ret; |
| 104 | + hid_descriptor_address = ret; |
| 105 | + |
| 106 | + adev = ACPI_COMPANION(dev); |
| 107 | + if (adev) |
| 108 | + acpi_device_fix_up_power(adev); |
| 109 | + |
| 110 | + if (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0) { |
| 111 | + device_set_wakeup_capable(dev, true); |
| 112 | + device_set_wakeup_enable(dev, false); |
| 113 | + } |
| 114 | + |
| 115 | + return i2c_hid_core_probe(client, &ihid_acpi->ops, |
| 116 | + hid_descriptor_address); |
| 117 | +} |
| 118 | + |
| 119 | +static const struct acpi_device_id i2c_hid_acpi_match[] = { |
| 120 | + {"ACPI0C50", 0 }, |
| 121 | + {"PNP0C50", 0 }, |
| 122 | + { }, |
| 123 | +}; |
| 124 | +MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match); |
| 125 | + |
| 126 | +static struct i2c_driver i2c_hid_acpi_driver = { |
| 127 | + .driver = { |
| 128 | + .name = "i2c_hid_acpi", |
| 129 | + .pm = &i2c_hid_core_pm, |
| 130 | + .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
| 131 | + .acpi_match_table = ACPI_PTR(i2c_hid_acpi_match), |
| 132 | + }, |
| 133 | + |
| 134 | + .probe = i2c_hid_acpi_probe, |
| 135 | + .remove = i2c_hid_core_remove, |
| 136 | + .shutdown = i2c_hid_core_shutdown, |
| 137 | +}; |
| 138 | + |
| 139 | +module_i2c_driver(i2c_hid_acpi_driver); |
| 140 | + |
| 141 | +MODULE_DESCRIPTION("HID over I2C ACPI driver"); |
| 142 | +MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>"); |
| 143 | +MODULE_LICENSE("GPL"); |
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