5 files changed, 480 insertions, 3 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 00d1e547b211..961d58d32647 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -906,6 +906,17 @@ config TOUCHSCREEN_STMPE
           To compile this driver as a module, choose M here: the
           module will be called stmpe-ts.
 
+config TOUCHSCREEN_SUR40
+        tristate "Samsung SUR40 (Surface 2.0/PixelSense) touchscreen"
+        depends on USB
+        select INPUT_POLLDEV
+        help
+          Say Y here if you want support for the Samsung SUR40 touchscreen
+          (also known as Microsoft Surface 2.0 or Microsoft PixelSense).
+
+          To compile this driver as a module, choose M here: the
+          module will be called sur40.
+
 config TOUCHSCREEN_TPS6507X
         tristate "TPS6507x based touchscreens"
         depends on I2C
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 7587883b8d38..62801f213346 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -54,6 +54,7 @@ obj-$(CONFIG_TOUCHSCREEN_PIXCIR)	+= pixcir_i2c_ts.o
 obj-$(CONFIG_TOUCHSCREEN_S3C2410)       += s3c2410_ts.o
 obj-$(CONFIG_TOUCHSCREEN_ST1232)        += st1232.o
 obj-$(CONFIG_TOUCHSCREEN_STMPE)         += stmpe-ts.o
+obj-$(CONFIG_TOUCHSCREEN_SUR40)         += sur40.o
 obj-$(CONFIG_TOUCHSCREEN_TI_AM335X_TSC) += ti_am335x_tsc.o
 obj-$(CONFIG_TOUCHSCREEN_TNETV107X)     += tnetv107x-ts.o
 obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213)    += touchit213.o
diff --git a/drivers/input/touchscreen/atmel-wm97xx.c b/drivers/input/touchscreen/atmel-wm97xx.c
index 268a35e55d7f..279c0e42b8a7 100644
--- a/drivers/input/touchscreen/atmel-wm97xx.c
+++ b/drivers/input/touchscreen/atmel-wm97xx.c
@@ -391,7 +391,7 @@ static int __exit atmel_wm97xx_remove(struct platform_device *pdev)
 }
 
 #ifdef CONFIG_PM_SLEEP
-static int atmel_wm97xx_suspend(struct *dev)
+static int atmel_wm97xx_suspend(struct device *dev)
 {
         struct platform_device *pdev = to_platform_device(dev);
         struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(pdev);
diff --git a/drivers/input/touchscreen/cyttsp4_core.c b/drivers/input/touchscreen/cyttsp4_core.c
index 42d830efa316..a035a390f8e2 100644
--- a/drivers/input/touchscreen/cyttsp4_core.c
+++ b/drivers/input/touchscreen/cyttsp4_core.c
@@ -1246,8 +1246,7 @@ static void cyttsp4_watchdog_timer(unsigned long handle)
 
         dev_vdbg(cd->dev, "%s: Watchdog timer triggered\n", __func__);
 
-        if (!work_pending(&cd->watchdog_work))
-                schedule_work(&cd->watchdog_work);
+        schedule_work(&cd->watchdog_work);
 
         return;
 }
diff --git a/drivers/input/touchscreen/sur40.c b/drivers/input/touchscreen/sur40.c
new file mode 100644
index 000000000000..cfd1b7e8c001
--- /dev/null
+++ b/drivers/input/touchscreen/sur40.c
@@ -0,0 +1,466 @@
+/*
+ * Surface2.0/SUR40/PixelSense input driver
+ *
+ * Copyright (c) 2013 by Florian 'floe' Echtler <floe@butterbrot.org>
+ *
+ * Derived from the USB Skeleton driver 1.1,
+ * Copyright (c) 2003 Greg Kroah-Hartman (greg@kroah.com)
+ *
+ * and from the Apple USB BCM5974 multitouch driver,
+ * Copyright (c) 2008 Henrik Rydberg (rydberg@euromail.se)
+ *
+ * and from the generic hid-multitouch driver,
+ * Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/completion.h>
+#include <linux/uaccess.h>
+#include <linux/usb.h>
+#include <linux/printk.h>
+#include <linux/input-polldev.h>
+#include <linux/input/mt.h>
+#include <linux/usb/input.h>
+
+/* read 512 bytes from endpoint 0x86 -> get header + blobs */
+struct sur40_header {
+
+        __le16 type;       /* always 0x0001 */
+        __le16 count;      /* count of blobs (if 0: continue prev. packet) */
+
+        __le32 packet_id;  /* unique ID for all packets in one frame */
+
+        __le32 timestamp;  /* milliseconds (inc. by 16 or 17 each frame) */
+        __le32 unknown;    /* "epoch?" always 02/03 00 00 00 */
+
+} __packed;
+
+struct sur40_blob {
+
+        __le16 blob_id;
+
+        u8 action;         /* 0x02 = enter/exit, 0x03 = update (?) */
+        u8 unknown;        /* always 0x01 or 0x02 (no idea what this is?) */
+
+        __le16 bb_pos_x;   /* upper left corner of bounding box */
+        __le16 bb_pos_y;
+
+        __le16 bb_size_x;  /* size of bounding box */
+        __le16 bb_size_y;
+
+        __le16 pos_x;      /* finger tip position */
+        __le16 pos_y;
+
+        __le16 ctr_x;      /* centroid position */
+        __le16 ctr_y;
+
+        __le16 axis_x;     /* somehow related to major/minor axis, mostly: */
+        __le16 axis_y;     /* axis_x == bb_size_y && axis_y == bb_size_x */
+
+        __le32 angle;      /* orientation in radians relative to x axis -
+                              actually an IEEE754 float, don't use in kernel */
+
+        __le32 area;       /* size in pixels/pressure (?) */
+
+        u8 padding[32];
+
+} __packed;
+
+/* combined header/blob data */
+struct sur40_data {
+        struct sur40_header header;
+        struct sur40_blob   blobs[];
+} __packed;
+
+
+/* version information */
+#define DRIVER_SHORT   "sur40"
+#define DRIVER_AUTHOR  "Florian 'floe' Echtler <floe@butterbrot.org>"
+#define DRIVER_DESC    "Surface2.0/SUR40/PixelSense input driver"
+
+/* vendor and device IDs */
+#define ID_MICROSOFT 0x045e
+#define ID_SUR40     0x0775
+
+/* sensor resolution */
+#define SENSOR_RES_X 1920
+#define SENSOR_RES_Y 1080
+
+/* touch data endpoint */
+#define TOUCH_ENDPOINT 0x86
+
+/* polling interval (ms) */
+#define POLL_INTERVAL 10
+
+/* maximum number of contacts FIXME: this is a guess? */
+#define MAX_CONTACTS 64
+
+/* control commands */
+#define SUR40_GET_VERSION 0xb0 /* 12 bytes string    */
+#define SUR40_UNKNOWN1    0xb3 /*  5 bytes           */
+#define SUR40_UNKNOWN2    0xc1 /* 24 bytes           */
+
+#define SUR40_GET_STATE   0xc5 /*  4 bytes state (?) */
+#define SUR40_GET_SENSORS 0xb1 /*  8 bytes sensors   */
+
+/*
+ * Note: an earlier, non-public version of this driver used USB_RECIP_ENDPOINT
+ * here by mistake which is very likely to have corrupted the firmware EEPROM
+ * on two separate SUR40 devices. Thanks to Alan Stern who spotted this bug.
+ * Should you ever run into a similar problem, the background story to this
+ * incident and instructions on how to fix the corrupted EEPROM are available
+ * at https://floe.butterbrot.org/matrix/hacking/surface/brick.html
+*/