HID: Wacom Graphire Bluetooth driver

Based on the work by Andrew Zabolotny, an HID driver for the Bluetooth
Wacom tablet. This is required as it uses a slightly different
protocols from what's currently support by the drivers/input/wacom*
driver, and those only support USB.

A user-space patch is required to activate mode 2 of the Wacom tablet,
as hidp does not support hid_output_raw_report.

Signed-off-by: Bastien Nocera <hadess@hadess.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 259 insertions, 0 deletions

diff --git a/drivers/hid/hid-wacom.c b/drivers/hid/hid-wacom.c
new file mode 100644
index 000000000000..1f9237f511e3
--- /dev/null
+++ b/drivers/hid/hid-wacom.c
@@ -0,0 +1,259 @@
+/*
+ *  Bluetooth Wacom Tablet support
+ *
+ *  Copyright (c) 1999 Andreas Gal
+ *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
+ *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
+ *  Copyright (c) 2006-2007 Jiri Kosina
+ *  Copyright (c) 2007 Paul Walmsley
+ *  Copyright (c) 2008 Jiri Slaby <jirislaby@gmail.com>
+ *  Copyright (c) 2006 Andrew Zabolotny <zap@homelink.ru>
+ *  Copyright (c) 2009 Bastien Nocera <hadess@hadess.net>
+ */
+
+/*
+ * 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/device.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+
+#include "hid-ids.h"
+
+struct wacom_data {
+        __u16 tool;
+        unsigned char butstate;
+};
+
+static int wacom_raw_event(struct hid_device *hdev, struct hid_report *report,
+                u8 *raw_data, int size)
+{
+        struct wacom_data *wdata = hid_get_drvdata(hdev);
+        struct hid_input *hidinput;
+        struct input_dev *input;
+        unsigned char *data = (unsigned char *) raw_data;
+        int tool, x, y, rw;
+
+        if (!(hdev->claimed & HID_CLAIMED_INPUT))
+                return 0;
+
+        tool = 0;
+        hidinput = list_entry(hdev->inputs.next, struct hid_input, list);
+        input = hidinput->input;
+
+        /* Check if this is a tablet report */
+        if (data[0] != 0x03)
+                return 0;
+
+        /* Get X & Y positions */
+        x = le16_to_cpu(*(__le16 *) &data[2]);
+        y = le16_to_cpu(*(__le16 *) &data[4]);
+
+        /* Get current tool identifier */
+        if (data[1] & 0x90) { /* If pen is in the in/active area */
+                switch ((data[1] >> 5) & 3) {
+                case 0: /* Pen */
+                        tool = BTN_TOOL_PEN;
+                        break;
+
+                case 1: /* Rubber */
+                        tool = BTN_TOOL_RUBBER;
+                        break;
+
+                case 2: /* Mouse with wheel */
+                case 3: /* Mouse without wheel */
+                        tool = BTN_TOOL_MOUSE;
+                        break;
+                }
+
+                /* Reset tool if out of active tablet area */
+                if (!(data[1] & 0x10))
+                        tool = 0;
+        }
+
+        /* If tool changed, notify input subsystem */
+        if (wdata->tool != tool) {
+                if (wdata->tool) {
+                        /* Completely reset old tool state */
+                        if (wdata->tool == BTN_TOOL_MOUSE) {
+                                input_report_key(input, BTN_LEFT, 0);
+                                input_report_key(input, BTN_RIGHT, 0);
+                                input_report_key(input, BTN_MIDDLE, 0);
+                                input_report_abs(input, ABS_DISTANCE,
+                                                input->absmax[ABS_DISTANCE]);
+                        } else {
+                                input_report_key(input, BTN_TOUCH, 0);
+                                input_report_key(input, BTN_STYLUS, 0);
+                                input_report_key(input, BTN_STYLUS2, 0);
+                                input_report_abs(input, ABS_PRESSURE, 0);
+                        }
+                        input_report_key(input, wdata->tool, 0);
+                        input_sync(input);
+                }
+                wdata->tool = tool;
+                if (tool)
+                        input_report_key(input, tool, 1);
+        }
+
+        if (tool) {
+                input_report_abs(input, ABS_X, x);
+                input_report_abs(input, ABS_Y, y);
+
+                switch ((data[1] >> 5) & 3) {
+                case 2: /* Mouse with wheel */
+                        input_report_key(input, BTN_MIDDLE, data[1] & 0x04);
+                        rw = (data[6] & 0x01) ? -1 :
+                                (data[6] & 0x02) ? 1 : 0;
+                        input_report_rel(input, REL_WHEEL, rw);
+                        /* fall through */
+
+                case 3: /* Mouse without wheel */
+                        input_report_key(input, BTN_LEFT, data[1] & 0x01);
+                        input_report_key(input, BTN_RIGHT, data[1] & 0x02);
+                        /* Compute distance between mouse and tablet */
+                        rw = 44 - (data[6] >> 2);
+                        if (rw < 0)
+                                rw = 0;
+                        else if (rw > 31)
+                                rw = 31;
+                        input_report_abs(input, ABS_DISTANCE, rw);
+                        break;
+
+                default:
+                        input_report_abs(input, ABS_PRESSURE,
+                                        data[6] | (((__u16) (data[1] & 0x08)) << 5));
+                        input_report_key(input, BTN_TOUCH, data[1] & 0x01);
+                        input_report_key(input, BTN_STYLUS, data[1] & 0x02);
+                        input_report_key(input, BTN_STYLUS2, (tool == BTN_TOOL_PEN) && data[1] & 0x04);
+                        break;
+                }
+
+                input_sync(input);
+        }
+
+        /* Report the state of the two buttons at the top of the tablet
+         * as two extra fingerpad keys (buttons 4 & 5). */
+        rw = data[7] & 0x03;
+        if (rw != wdata->butstate) {
+                wdata->butstate = rw;
+                input_report_key(input, BTN_0, rw & 0x02);
+                input_report_key(input, BTN_1, rw & 0x01);
+                input_event(input, EV_MSC, MSC_SERIAL, 0xf0);
+                input_sync(input);
+        }
+
+        return 1;
+}
+
+static int wacom_probe(struct hid_device *hdev,
+                const struct hid_device_id *id)
+{
+        struct hid_input *hidinput;
+        struct input_dev *input;
+        struct wacom_data *wdata;
+        int ret;
+
+        wdata = kzalloc(sizeof(*wdata), GFP_KERNEL);
+        if (wdata == NULL) {
+                dev_err(&hdev->dev, "can't alloc wacom descriptor\n");
+                return -ENOMEM;
+        }
+
+        hid_set_drvdata(hdev, wdata);
+
+        ret = hid_parse(hdev);
+        if (ret) {
+                dev_err(&hdev->dev, "parse failed\n");
+                goto err_free;
+        }
+
+        ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+        if (ret) {
+                dev_err(&hdev->dev, "hw start failed\n");
+                goto err_free;
+        }
+
+        hidinput = list_entry(hdev->inputs.next, struct hid_input, list);
+        input = hidinput->input;
+
+        /* Basics */
+        input->evbit[0] |= BIT(EV_KEY) | BIT(EV_ABS) | BIT(EV_REL);
+        input->absbit[0] |= BIT(ABS_X) | BIT(ABS_Y) |
+                BIT(ABS_PRESSURE) | BIT(ABS_DISTANCE);
+        input->relbit[0] |= BIT(REL_WHEEL);
+        set_bit(BTN_TOOL_PEN, input->keybit);
+        set_bit(BTN_TOUCH, input->keybit);
+        set_bit(BTN_STYLUS, input->keybit);
+        set_bit(BTN_STYLUS2, input->keybit);
+        set_bit(BTN_LEFT, input->keybit);
+        set_bit(BTN_RIGHT, input->keybit);
+        set_bit(BTN_MIDDLE, input->keybit);
+
+        /* Pad */
+        input->evbit[0] |= BIT(EV_MSC);
+        input->mscbit[0] |= BIT(MSC_SERIAL);
+
+        /* Distance, rubber and mouse */
+        input->absbit[0] |= BIT(ABS_DISTANCE);
+        set_bit(BTN_TOOL_RUBBER, input->keybit);
+        set_bit(BTN_TOOL_MOUSE, input->keybit);
+
+        input->absmax[ABS_PRESSURE] = 511;
+        input->absmax[ABS_DISTANCE] = 32;
+
+        input->absmax[ABS_X] = 16704;
+        input->absmax[ABS_Y] = 12064;
+        input->absfuzz[ABS_X] = 4;
+        input->absfuzz[ABS_Y] = 4;
+
+        return 0;
+err_free:
+        kfree(wdata);
+        return ret;
+}
+
+static void wacom_remove(struct hid_device *hdev)
+{
+        hid_hw_stop(hdev);
+        kfree(hid_get_drvdata(hdev));
+}
+
+static const struct hid_device_id wacom_devices[] = {
+        { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_GRAPHIRE_BLUETOOTH) },
+
+        { }
+};
+MODULE_DEVICE_TABLE(hid, wacom_devices);
+
+static struct hid_driver wacom_driver = {
+        .name = "wacom",
+        .id_table = wacom_devices,
+        .probe = wacom_probe,
+        .remove = wacom_remove,
+        .raw_event = wacom_raw_event,
+};
+
+static int wacom_init(void)
+{
+        int ret;
+
+        ret = hid_register_driver(&wacom_driver);
+        if (ret)
+                printk(KERN_ERR "can't register wacom driver\n");
+        printk(KERN_ERR "wacom driver registered\n");
+        return ret;
+}
+
+static void wacom_exit(void)
+{
+        hid_unregister_driver(&wacom_driver);
+}
+
+module_init(wacom_init);
+module_exit(wacom_exit);
+MODULE_LICENSE("GPL");
+