HID: elan: Add support for touchpad on the Toshiba Click Mini L9W

The Toshiba Click Mini L9W keyboard dock has a single i2c-hid Elan device
for both the keyboard and the touchpad. Add support for the touchpad to
the hid-elan driver, rather then relying on mouse emulation.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/hid-elan.c b/drivers/hid/hid-elan.c
index 4b050d3..07e26c3 100644 (file)
--- a/drivers/hid/hid-elan.c
+++ b/drivers/hid/hid-elan.c
@@ -19,10 +19,13 @@
 
 #include "hid-ids.h"
 
+#define ELAN_MT_I2C            0x5d
 #define ELAN_SINGLE_FINGER     0x81
 #define ELAN_MT_FIRST_FINGER   0x82
 #define ELAN_MT_SECOND_FINGER  0x83
 #define ELAN_INPUT_REPORT_SIZE 8
+#define ELAN_I2C_REPORT_SIZE   32
+#define ELAN_FINGER_DATA_LEN   5
 #define ELAN_MAX_FINGERS       5
 #define ELAN_MAX_PRESSURE      255
 #define ELAN_TP_USB_INTF       1
@@ -51,9 +54,14 @@ struct elan_drvdata {
 
 static int is_not_elan_touchpad(struct hid_device *hdev)
 {
-       struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
+       if (hdev->bus == BUS_USB) {
+               struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
 
-       return (intf->altsetting->desc.bInterfaceNumber != ELAN_TP_USB_INTF);
+               return (intf->altsetting->desc.bInterfaceNumber !=
+                       ELAN_TP_USB_INTF);
+       }
+
+       return 0;
 }
 
 static int elan_input_mapping(struct hid_device *hdev, struct hid_input *hi,
@@ -65,7 +73,8 @@ static int elan_input_mapping(struct hid_device *hdev, struct hid_input *hi,
 
        if (field->report->id == ELAN_SINGLE_FINGER ||
            field->report->id == ELAN_MT_FIRST_FINGER ||
-           field->report->id == ELAN_MT_SECOND_FINGER)
+           field->report->id == ELAN_MT_SECOND_FINGER ||
+           field->report->id == ELAN_MT_I2C)
                return -1;
 
        return 0;
@@ -224,7 +233,7 @@ static void elan_report_mt_slot(struct elan_drvdata *drvdata, u8 *data,
        }
 }
 
-static void elan_report_input(struct elan_drvdata *drvdata, u8 *data)
+static void elan_usb_report_input(struct elan_drvdata *drvdata, u8 *data)
 {
        int i;
        struct input_dev *input = drvdata->input;
@@ -311,6 +320,46 @@ static void elan_report_input(struct elan_drvdata *drvdata, u8 *data)
        input_sync(input);
 }
 
+static void elan_i2c_report_input(struct elan_drvdata *drvdata, u8 *data)
+{
+       struct input_dev *input = drvdata->input;
+       u8 *finger_data;
+       int i;
+
+       /*
+        * Elan MT touchpads in i2c mode send finger data in the same format
+        * as in USB mode, but then with all fingers in a single packet.
+        *
+        * packet structure for ELAN_MT_I2C:
+        *
+        * byte     1: 1   0   0   1   1   1   0   1   // 0x5d
+        * byte     2: f5  f4  f3  f2  f1  0   0   L
+        * byte     3: x12 x11 x10 x9  0?  y11 y10 y9
+        * byte     4: x8  x7  x6  x5  x4  x3  x2  x1
+        * byte     5: y8  y7  y6  y5  y4  y3  y2  y1
+        * byte     6: sy4 sy3 sy2 sy1 sx4 sx3 sx2 sx1
+        * byte     7: p8  p7  p6  p5  p4  p3  p2  p1
+        * byte  8-12: Same as byte 3-7 for second finger down
+        * byte 13-17: Same as byte 3-7 for third finger down
+        * byte 18-22: Same as byte 3-7 for fourth finger down
+        * byte 23-27: Same as byte 3-7 for fifth finger down
+        */
+
+       finger_data = data + 2;
+       for (i = 0; i < ELAN_MAX_FINGERS; i++) {
+               if (data[1] & BIT(i + 3)) {
+                       elan_report_mt_slot(drvdata, finger_data, i);
+                       finger_data += ELAN_FINGER_DATA_LEN;
+               } else {
+                       elan_report_mt_slot(drvdata, NULL, i);
+               }
+       }
+
+       input_report_key(input, BTN_LEFT, data[1] & 0x01);
+       input_mt_sync_frame(input);
+       input_sync(input);
+}
+
 static int elan_raw_event(struct hid_device *hdev,
                          struct hid_report *report, u8 *data, int size)
 {
@@ -323,11 +372,16 @@ static int elan_raw_event(struct hid_device *hdev,
            data[0] == ELAN_MT_FIRST_FINGER ||
            data[0] == ELAN_MT_SECOND_FINGER) {
                if (size == ELAN_INPUT_REPORT_SIZE) {
-                       elan_report_input(drvdata, data);
+                       elan_usb_report_input(drvdata, data);
                        return 1;
                }
        }
 
+       if (data[0] == ELAN_MT_I2C && size == ELAN_I2C_REPORT_SIZE) {
+               elan_i2c_report_input(drvdata, data);
+               return 1;
+       }
+
        return 0;
 }
 
@@ -474,6 +528,7 @@ static const struct hid_device_id elan_devices[] = {
          .driver_data = ELAN_HAS_LED },
        { HID_USB_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_HP_X2_10_COVER),
          .driver_data = ELAN_HAS_LED },
+       { HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_TOSHIBA_CLICK_L9W) },
        { }
 };
 MODULE_DEVICE_TABLE(hid, elan_devices);

diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 28f96de..aa57e70 100644 (file)
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -369,6 +369,7 @@
 #define USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_A001      0xa001
 
 #define USB_VENDOR_ID_ELAN             0x04f3
+#define USB_DEVICE_ID_TOSHIBA_CLICK_L9W        0x0401
 #define USB_DEVICE_ID_HP_X2            0x074d
 #define USB_DEVICE_ID_HP_X2_10_COVER   0x0755