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-rw-r--r--drivers/hid/i2c-hid/i2c-hid-acpi.c146
1 files changed, 146 insertions, 0 deletions
diff --git a/drivers/hid/i2c-hid/i2c-hid-acpi.c b/drivers/hid/i2c-hid/i2c-hid-acpi.c
new file mode 100644
index 000000000..6d35bb397
--- /dev/null
+++ b/drivers/hid/i2c-hid/i2c-hid-acpi.c
@@ -0,0 +1,146 @@
+/*
+ * 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" },
+ /*
+ * The IDEA5002 ACPI device causes high interrupt usage and spurious
+ * wakeups from suspend.
+ */
+ { "IDEA5002" },
+ { }
+};
+
+/* 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, 0);
+}
+
+static const struct acpi_device_id i2c_hid_acpi_match[] = {
+ { "ACPI0C50" },
+ { "PNP0C50" },
+ { }
+};
+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");