summaryrefslogtreecommitdiffstats
path: root/include/linux/i2c
diff options
context:
space:
mode:
authorBenjamin Tissoires <benjamin.tissoires@gmail.com>2012-11-12 15:42:59 +0100
committerJiri Kosina <jkosina@suse.cz>2012-11-19 11:04:38 +0100
commit4a200c3b9a40242652b5734630bdd0bcf3aca75f (patch)
tree777d9c0c9ebfb50bce882ff17a211b7b28aca618 /include/linux/i2c
parent1a1e8c6fada5f6dc48aa5dad453c9d9ebfdc8218 (diff)
downloadlinux-4a200c3b9a40242652b5734630bdd0bcf3aca75f.tar.gz
linux-4a200c3b9a40242652b5734630bdd0bcf3aca75f.tar.bz2
linux-4a200c3b9a40242652b5734630bdd0bcf3aca75f.zip
HID: i2c-hid: introduce HID over i2c specification implementation
Microsoft published the protocol specification of HID over i2c: http://msdn.microsoft.com/en-us/library/windows/hardware/hh852380.aspx This patch introduces an implementation of this protocol. This implementation does not includes the ACPI part of the specification. This will come when ACPI 5.0 devices enumeration will be available. Once the ACPI part is done, OEM will not have to declare HID over I2C devices in their platform specific driver. Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'include/linux/i2c')
-rw-r--r--include/linux/i2c/i2c-hid.h35
1 files changed, 35 insertions, 0 deletions
diff --git a/include/linux/i2c/i2c-hid.h b/include/linux/i2c/i2c-hid.h
new file mode 100644
index 000000000000..60e411d764d4
--- /dev/null
+++ b/include/linux/i2c/i2c-hid.h
@@ -0,0 +1,35 @@
+/*
+ * HID over I2C protocol implementation
+ *
+ * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
+ * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
+ *
+ * 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.
+ */
+
+#ifndef __LINUX_I2C_HID_H
+#define __LINUX_I2C_HID_H
+
+#include <linux/types.h>
+
+/**
+ * struct i2chid_platform_data - used by hid over i2c implementation.
+ * @hid_descriptor_address: i2c register where the HID descriptor is stored.
+ *
+ * Note that it is the responsibility of the platform driver (or the acpi 5.0
+ * driver) to setup the irq related to the gpio in the struct i2c_board_info.
+ * The platform driver should also setup the gpio according to the device:
+ *
+ * A typical example is the following:
+ * irq = gpio_to_irq(intr_gpio);
+ * hkdk4412_i2c_devs5[0].irq = irq; // store the irq in i2c_board_info
+ * gpio_request(intr_gpio, "elan-irq");
+ * s3c_gpio_setpull(intr_gpio, S3C_GPIO_PULL_UP);
+ */
+struct i2c_hid_platform_data {
+ u16 hid_descriptor_address;
+};
+
+#endif /* __LINUX_I2C_HID_H */