HID: add hid-cp2112 driver

This patch adds support for the Silicon Labs CP2112 "Single-Chip HID USB to
SMBus Master Bridge."

This is a HID device driver which registers as an i2c adapter and gpiochip to
expose these functions of the CP2112. The customizable USB descriptor fields
are exposed as sysfs attributes.  The SMBus byte-read, byte-data-read/write,
and word-data-read transfer modes have been tested by talking to an i2c
sensor.  The GPIO functions and USB descriptor field programming have also
been tested.

Signed-off-by: David Barksdale <dbarksdale@uplogix.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index f7220011a00b..5eaf0db27ec0 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -175,6 +175,15 @@ config HID_PRODIKEYS
           multimedia keyboard, but will lack support for the musical keyboard
           and some additional multimedia keys.
 
+config HID_CP2112
+        tristate "Silicon Labs CP2112 HID USB-to-SMBus Bridge support"
+        depends on USB_HID && I2C
+        ---help---
+        Support for Silicon Labs CP2112 HID USB to SMBus Master Bridge.
+        This is a HID device driver which registers as an i2c adapter
+        and gpiochip to expose these functions of the CP2112. The
+        customizable USB descriptor fields are exposed as sysfs attributes.
+
 config HID_CYPRESS
         tristate "Cypress mouse and barcode readers" if EXPERT
         depends on HID