Input: wacom - add support for new USB Tablet PCs

Signed-off-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 199 insertions, 29 deletions

diff --git a/drivers/input/tablet/wacom_sys.c b/drivers/input/tablet/wacom_sys.c
index 5fbc463baf5a..7fe73586e024 100644
--- a/drivers/input/tablet/wacom_sys.c
+++ b/drivers/input/tablet/wacom_sys.c
@@ -14,8 +14,41 @@
 #include "wacom.h"
 #include "wacom_wac.h"
 
+/* defines to get HID report descriptor */
+#define HID_DEVICET_HID         (USB_TYPE_CLASS | 0x01)
+#define HID_DEVICET_REPORT      (USB_TYPE_CLASS | 0x02)
+#define HID_USAGE_UNDEFINED             0x00
+#define HID_USAGE_PAGE                  0x05
+#define HID_USAGE_PAGE_DIGITIZER        0x0d
+#define HID_USAGE_PAGE_DESKTOP          0x01
+#define HID_USAGE                       0x09
+#define HID_USAGE_X                     0x30
+#define HID_USAGE_Y                     0x31
+#define HID_USAGE_X_TILT                0x3d
+#define HID_USAGE_Y_TILT                0x3e
+#define HID_USAGE_FINGER                0x22
+#define HID_USAGE_STYLUS                0x20
+#define HID_COLLECTION                  0xc0
+
+enum {
+        WCM_UNDEFINED = 0,
+        WCM_DESKTOP,
+        WCM_DIGITIZER,
+};
+
+struct hid_descriptor {
+        struct usb_descriptor_header header;
+        __le16   bcdHID;
+        u8       bCountryCode;
+        u8       bNumDescriptors;
+        u8       bDescriptorType;
+        __le16   wDescriptorLength;
+} __attribute__ ((packed));
+
+/* defines to get/set USB message */
 #define USB_REQ_GET_REPORT      0x01
 #define USB_REQ_SET_REPORT      0x09
+#define WAC_HID_FEATURE_REPORT  0x03
 
 static int usb_get_report(struct usb_interface *intf, unsigned char type,
                                 unsigned char id, void *buf, int size)
@@ -80,25 +113,21 @@ static void wacom_sys_irq(struct urb *urb)
 void wacom_report_key(void *wcombo, unsigned int key_type, int key_data)
 {
         input_report_key(get_input_dev((struct wacom_combo *)wcombo), key_type, key_data);
-        return;
 }
 
 void wacom_report_abs(void *wcombo, unsigned int abs_type, int abs_data)
 {
         input_report_abs(get_input_dev((struct wacom_combo *)wcombo), abs_type, abs_data);
-        return;
 }
 
 void wacom_report_rel(void *wcombo, unsigned int rel_type, int rel_data)
 {
         input_report_rel(get_input_dev((struct wacom_combo *)wcombo), rel_type, rel_data);
-        return;
 }
 
 void wacom_input_event(void *wcombo, unsigned int type, unsigned int code, int value)
 {
         input_event(get_input_dev((struct wacom_combo *)wcombo), type, code, value);
-        return;
 }
 
 __u16 wacom_be16_to_cpu(unsigned char *data)
@@ -118,7 +147,6 @@ __u16 wacom_le16_to_cpu(unsigned char *data)
 void wacom_input_sync(void *wcombo)
 {
         input_sync(get_input_dev((struct wacom_combo *)wcombo));
-        return;
 }
 
 static int wacom_open(struct input_dev *dev)
@@ -160,7 +188,7 @@ static void wacom_close(struct input_dev *dev)
 
 void input_dev_mo(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
 {
-        input_dev->keybit[BIT_WORD(BTN_LEFT)] |= BIT_MASK(BTN_1) |
+        input_dev->keybit[BIT_WORD(BTN_MISC)] |= BIT_MASK(BTN_1) |
                 BIT_MASK(BTN_5);
         input_set_abs_params(input_dev, ABS_WHEEL, 0, 71, 0, 0);
 }
@@ -170,7 +198,7 @@ void input_dev_g4(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
         input_dev->evbit[0] |= BIT_MASK(EV_MSC);
         input_dev->mscbit[0] |= BIT_MASK(MSC_SERIAL);
         input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_FINGER);
-        input_dev->keybit[BIT_WORD(BTN_LEFT)] |= BIT_MASK(BTN_0) |
+        input_dev->keybit[BIT_WORD(BTN_MISC)] |= BIT_MASK(BTN_0) |
                 BIT_MASK(BTN_4);
 }
 
@@ -178,7 +206,7 @@ void input_dev_g(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
 {
         input_dev->evbit[0] |= BIT_MASK(EV_REL);
         input_dev->relbit[0] |= BIT_MASK(REL_WHEEL);
-        input_dev->keybit[BIT_WORD(BTN_LEFT)] |= BIT_MASK(BTN_LEFT) |
+        input_dev->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_LEFT) |
                 BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
         input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_RUBBER) |
                 BIT_MASK(BTN_TOOL_MOUSE) | BIT_MASK(BTN_STYLUS2);
@@ -188,7 +216,7 @@ void input_dev_g(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
 void input_dev_i3s(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
 {
         input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_FINGER);
-        input_dev->keybit[BIT_WORD(BTN_LEFT)] |= BIT_MASK(BTN_0) |
+        input_dev->keybit[BIT_WORD(BTN_MISC)] |= BIT_MASK(BTN_0) |
                 BIT_MASK(BTN_1) | BIT_MASK(BTN_2) | BIT_MASK(BTN_3);
         input_set_abs_params(input_dev, ABS_RX, 0, 4096, 0, 0);
         input_set_abs_params(input_dev, ABS_Z, -900, 899, 0, 0);
@@ -196,14 +224,14 @@ void input_dev_i3s(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
 
 void input_dev_i3(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
 {
-        input_dev->keybit[BIT_WORD(BTN_LEFT)] |= BIT_MASK(BTN_4) |
+        input_dev->keybit[BIT_WORD(BTN_MISC)] |= BIT_MASK(BTN_4) |
                 BIT_MASK(BTN_5) | BIT_MASK(BTN_6) | BIT_MASK(BTN_7);
         input_set_abs_params(input_dev, ABS_RY, 0, 4096, 0, 0);
 }
 
 void input_dev_bee(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
 {
-        input_dev->keybit[BIT_WORD(BTN_LEFT)] |= BIT_MASK(BTN_8) | BIT_MASK(BTN_9);
+        input_dev->keybit[BIT_WORD(BTN_MISC)] |= BIT_MASK(BTN_8) | BIT_MASK(BTN_9);
 }
 
 void input_dev_i(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
@@ -211,7 +239,7 @@ void input_dev_i(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
         input_dev->evbit[0] |= BIT_MASK(EV_MSC) | BIT_MASK(EV_REL);
         input_dev->mscbit[0] |= BIT_MASK(MSC_SERIAL);
         input_dev->relbit[0] |= BIT_MASK(REL_WHEEL);
-        input_dev->keybit[BIT_WORD(BTN_LEFT)] |= BIT_MASK(BTN_LEFT) |
+        input_dev->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_LEFT) |
                 BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE) |
                 BIT_MASK(BTN_SIDE) | BIT_MASK(BTN_EXTRA);
         input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_RUBBER) |
@@ -228,8 +256,7 @@ void input_dev_i(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
 
 void input_dev_pl(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
 {
-        input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_STYLUS2) |
-                BIT_MASK(BTN_TOOL_RUBBER);
+        input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_STYLUS2);
 }
 
 void input_dev_pt(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
@@ -237,15 +264,129 @@ void input_dev_pt(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
         input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_RUBBER);
 }
 
+static int wacom_parse_hid(struct usb_interface *intf, struct hid_descriptor *hid_desc,
+                           struct wacom_wac *wacom_wac)
+{
+        struct usb_device *dev = interface_to_usbdev(intf);
+        struct wacom_features *features = wacom_wac->features;
+        char limit = 0, result = 0;
+        int i = 0, usage = WCM_UNDEFINED, finger = 0, pen = 0;
+        unsigned char *report;
+
+        report = kzalloc(hid_desc->wDescriptorLength, GFP_KERNEL);
+        if (!report)
+                return -ENOMEM;
+
+        /* retrive report descriptors */
+        do {
+                result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+                        USB_REQ_GET_DESCRIPTOR,
+                        USB_RECIP_INTERFACE | USB_DIR_IN,
+                        HID_DEVICET_REPORT << 8,
+                        intf->altsetting[0].desc.bInterfaceNumber, /* interface */
+                        report,
+                        hid_desc->wDescriptorLength,
+                        5000); /* 5 secs */
+        } while (result < 0 && limit++ < 5);
+
+        if (result < 0)
+                goto out;
+
+        for (i = 0; i < hid_desc->wDescriptorLength; i++) {
+
+                switch (report[i]) {
+                case HID_USAGE_PAGE:
+                        switch (report[i + 1]) {
+                        case HID_USAGE_PAGE_DIGITIZER:
+                                usage = WCM_DIGITIZER;
+                                i++;
+                                break;
+
+                        case HID_USAGE_PAGE_DESKTOP:
+                                usage = WCM_DESKTOP;
+                                i++;
+                                break;
+                        }
+                        break;
+
+                case HID_USAGE:
+                        switch (report[i + 1]) {
+                        case HID_USAGE_X:
+                                if (usage == WCM_DESKTOP) {
+                                        if (finger) {
+                                                features->touch_x_max =
+                                                        features->touch_y_max =
+                                                        wacom_le16_to_cpu(&report[i + 3]);
+                                                features->x_max =
+                                                        wacom_le16_to_cpu(&report[i + 6]);
+                                                i += 7;
+                                        } else if (pen) {
+                                                features->x_max =
+                                                        wacom_le16_to_cpu(&report[i + 3]);
+                                                i += 4;
+                                        }
+                                } else if (usage == WCM_DIGITIZER) {
+                                        /* max pressure isn't reported
+                                        features->pressure_max = (unsigned short)
+                                                        (report[i+4] << 8  | report[i + 3]);
+                                        */
+                                        features->pressure_max = 255;
+                                        i += 4;
+                                }
+                                break;
+
+                        case HID_USAGE_Y:
+                                if (usage == WCM_DESKTOP)
+                                        features->y_max =
+                                                wacom_le16_to_cpu(&report[i + 3]);
+                                i += 4;
+                                break;
+
+                        case HID_USAGE_FINGER:
+                                finger = 1;
+                                i++;
+                                break;
+
+                        case HID_USAGE_STYLUS:
+                                pen = 1;
+                                i++;
+                                break;
+
+                        case HID_USAGE_UNDEFINED:
+                                if (usage == WCM_DESKTOP && finger) /* capacity */
+                                        features->pressure_max =
+                                                wacom_le16_to_cpu(&report[i + 3]);
+                                i += 4;
+                                break;
+                        }
+                        break;
+
+                case HID_COLLECTION:
+                        /* reset UsagePage ans Finger */
+                        finger = usage = 0;
+                        break;
+                }
+        }
+
+        result = 0;
+
+ out:
+        kfree(report);
+        return result;
+}
+
 static int wacom_probe(struct usb_interface *intf, const struct usb_device_id *id)
 {
         struct usb_device *dev = interface_to_usbdev(intf);
+        struct usb_host_interface *interface = intf->cur_altsetting;
         struct usb_endpoint_descriptor *endpoint;
         struct wacom *wacom;
         struct wacom_wac *wacom_wac;
+        struct wacom_features *features;
         struct input_dev *input_dev;
         int error = -ENOMEM;
         char rep_data[2], limit = 0;
+        struct hid_descriptor *hid_desc;
 
         wacom = kzalloc(sizeof(struct wacom), GFP_KERNEL);
         wacom_wac = kzalloc(sizeof(struct wacom_wac), GFP_KERNEL);
@@ -268,8 +409,8 @@ static int wacom_probe(struct usb_interface *intf, const struct usb_device_id *i
         usb_make_path(dev, wacom->phys, sizeof(wacom->phys));
         strlcat(wacom->phys, "/input0", sizeof(wacom->phys));
 
-        wacom_wac->features = get_wacom_feature(id);
-        BUG_ON(wacom_wac->features->pktlen > 10);
+        wacom_wac->features = features = get_wacom_feature(id);
+        BUG_ON(features->pktlen > 10);
 
         input_dev->name = wacom_wac->features->name;
         wacom->wacom_wac = wacom_wac;
@@ -282,18 +423,37 @@ static int wacom_probe(struct usb_interface *intf, const struct usb_device_id *i
         input_dev->open = wacom_open;
         input_dev->close = wacom_close;
 
+        endpoint = &intf->cur_altsetting->endpoint[0].desc;
+
+        /* TabletPC need to retrieve the physical and logical maximum from report descriptor */
+        if (wacom_wac->features->type == TABLETPC) {
+                if (usb_get_extra_descriptor(interface, HID_DEVICET_HID, &hid_desc)) {
+                        if (usb_get_extra_descriptor(&interface->endpoint[0],
+                                                     HID_DEVICET_REPORT, &hid_desc)) {
+                                printk("wacom: can not retrive extra class descriptor\n");
+                                goto fail2;
+                        }
+                }
+                error = wacom_parse_hid(intf, hid_desc, wacom_wac);
+                if (error)
+                        goto fail2;
+        }
+
         input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
         input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_PEN) |
                 BIT_MASK(BTN_TOUCH) | BIT_MASK(BTN_STYLUS);
-        input_set_abs_params(input_dev, ABS_X, 0, wacom_wac->features->x_max, 4, 0);
-        input_set_abs_params(input_dev, ABS_Y, 0, wacom_wac->features->y_max, 4, 0);
-        input_set_abs_params(input_dev, ABS_PRESSURE, 0, wacom_wac->features->pressure_max, 0, 0);
+        input_set_abs_params(input_dev, ABS_X, 0, features->x_max, 4, 0);
+        input_set_abs_params(input_dev, ABS_Y, 0, features->y_max, 4, 0);
+        input_set_abs_params(input_dev, ABS_PRESSURE, 0, features->pressure_max, 0, 0);
+        if (features->type == TABLETPC) {
+                input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_DOUBLETAP);
+                input_set_abs_params(input_dev, ABS_RX, 0, features->touch_x_max, 4, 0);
+                input_set_abs_params(input_dev, ABS_RY, 0, features->touch_y_max, 4, 0);
+        }
         input_dev->absbit[BIT_WORD(ABS_MISC)] |= BIT_MASK(ABS_MISC);
 
         wacom_init_input_dev(input_dev, wacom_wac);
 
-        endpoint = &intf->cur_altsetting->endpoint[0].desc;
-
         usb_fill_int_urb(wacom->irq, dev,
                          usb_rcvintpipe(dev, endpoint->bEndpointAddress),
                          wacom_wac->data, wacom_wac->features->pktlen,
@@ -305,13 +465,22 @@ static int wacom_probe(struct usb_interface *intf, const struct usb_device_id *i
         if (error)
                 goto fail3;
 
-        /* Ask the tablet to report tablet data. Repeat until it succeeds */
-        do {
-                rep_data[0] = 2;
-                rep_data[1] = 2;
-                usb_set_report(intf, 3, 2, rep_data, 2);
-                usb_get_report(intf, 3, 2, rep_data, 2);
-        } while (rep_data[1] != 2 && limit++ < 5);
+        /*
+         * Ask the tablet to report tablet data if it is not a Tablet PC.
+         * Repeat until it succeeds
+         */
+        if (wacom_wac->features->type != TABLETPC) {
+                do {
+                        rep_data[0] = 2;
+                        rep_data[1] = 2;
+                        error = usb_set_report(intf, WAC_HID_FEATURE_REPORT,
+                                                2, rep_data, 2);
+                        if (error >= 0)
+                                error = usb_get_report(intf,
+                                                WAC_HID_FEATURE_REPORT, 2,
+                                                rep_data, 2);
+                } while ((error < 0 || rep_data[1] != 2) && limit++ < 5);
+        }
 
         usb_set_intfdata(intf, wacom);
         return 0;
@@ -333,7 +502,8 @@ static void wacom_disconnect(struct usb_interface *intf)
         usb_kill_urb(wacom->irq);
         input_unregister_device(wacom->dev);
         usb_free_urb(wacom->irq);
-        usb_buffer_free(interface_to_usbdev(intf), 10, wacom->wacom_wac->data, wacom->data_dma);
+        usb_buffer_free(interface_to_usbdev(intf), 10,
+                        wacom->wacom_wac->data, wacom->data_dma);
         kfree(wacom->wacom_wac);
         kfree(wacom);
 }