Input: usbtouchscreen - add support for e2i touchscreen controller

This patch adds support for the e2i touchscreen controller used in the
Mimo 740 (and probably in other e2i touchscreen products). Tested on
Mimo 740.

Signed-off-by: Florian Echtler <floe@butterbrot.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 49 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/usbtouchscreen.c b/drivers/input/touchscreen/usbtouchscreen.c
index c07be07a69bb..68ece5801a58 100644
--- a/drivers/input/touchscreen/usbtouchscreen.c
+++ b/drivers/input/touchscreen/usbtouchscreen.c
@@ -120,6 +120,7 @@ enum {
         DEVTYPE_GENERAL_TOUCH,
         DEVTYPE_GOTOP,
         DEVTYPE_JASTEC,
+        DEVTYPE_E2I,
 };
 
 #define USB_DEVICE_HID_CLASS(vend, prod) \
@@ -197,11 +198,47 @@ static struct usb_device_id usbtouch_devices[] = {
         {USB_DEVICE(0x0f92, 0x0001), .driver_info = DEVTYPE_JASTEC},
 #endif
 
+#ifdef CONFIG_TOUCHSCREEN_USB_E2I
+        {USB_DEVICE(0x1ac7, 0x0001), .driver_info = DEVTYPE_E2I},
+#endif
         {}
 };
 
 
 /*****************************************************************************
+ * e2i Part
+ */
+
+#ifdef CONFIG_TOUCHSCREEN_USB_E2I
+static int e2i_init(struct usbtouch_usb *usbtouch)
+{
+        int ret;
+
+        ret = usb_control_msg(usbtouch->udev, usb_rcvctrlpipe(usbtouch->udev, 0),
+                              0x01, 0x02, 0x0000, 0x0081,
+                              NULL, 0, USB_CTRL_SET_TIMEOUT);
+
+        dbg("%s - usb_control_msg - E2I_RESET - bytes|err: %d",
+            __func__, ret);
+        return ret;
+}
+
+static int e2i_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
+{
+        int tmp = (pkt[0] << 8) | pkt[1];
+        dev->x  = (pkt[2] << 8) | pkt[3];
+        dev->y  = (pkt[4] << 8) | pkt[5];
+
+        tmp = tmp - 0xA000;
+        dev->touch = (tmp > 0);
+        dev->press = (tmp > 0 ? tmp : 0);
+
+        return 1;
+}
+#endif
+
+
+/*****************************************************************************
  * eGalax part
  */
 
@@ -734,6 +771,18 @@ static struct usbtouch_device_info usbtouch_dev_info[] = {
                 .read_data      = jastec_read_data,
         },
 #endif
+
+#ifdef CONFIG_TOUCHSCREEN_USB_E2I
+        [DEVTYPE_E2I] = {
+                .min_xc         = 0x0,
+                .max_xc         = 0x7fff,
+                .min_yc         = 0x0,
+                .max_yc         = 0x7fff,
+                .rept_size      = 6,
+                .init           = e2i_init,
+                .read_data      = e2i_read_data,
+        },
+#endif
 };