HID: Implement Wacom quirk in the kernel

The hid-wacom driver required user-space to poke at the tablet
to make it send data about the cursor location.

This patch makes it do the same thing but in the kernel.

Signed-off-by: Bastien Nocera <hadess@hadess.net>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 27 insertions, 0 deletions

diff --git a/drivers/hid/hid-wacom.c b/drivers/hid/hid-wacom.c
index 12dcda529201..b8778db720bc 100644
--- a/drivers/hid/hid-wacom.c
+++ b/drivers/hid/hid-wacom.c
@@ -156,7 +156,9 @@ static int wacom_probe(struct hid_device *hdev,
         struct hid_input *hidinput;
         struct input_dev *input;
         struct wacom_data *wdata;
+        char rep_data[2];
         int ret;
+        int limit;
 
         wdata = kzalloc(sizeof(*wdata), GFP_KERNEL);
         if (wdata == NULL) {
@@ -166,6 +168,7 @@ static int wacom_probe(struct hid_device *hdev,
 
         hid_set_drvdata(hdev, wdata);
 
+        /* Parse the HID report now */
         ret = hid_parse(hdev);
         if (ret) {
                 dev_err(&hdev->dev, "parse failed\n");
@@ -178,6 +181,30 @@ static int wacom_probe(struct hid_device *hdev,
                 goto err_free;
         }
 
+        /* Set Wacom mode2 */
+        rep_data[0] = 0x03; rep_data[1] = 0x00;
+        limit = 3;
+        do {
+                ret = hdev->hid_output_raw_report(hdev, rep_data, 2,
+                                HID_FEATURE_REPORT);
+        } while (ret < 0 && limit-- > 0);
+        if (ret < 0) {
+                dev_err(&hdev->dev, "failed to poke device #1, %d\n", ret);
+                goto err_free;
+        }
+
+        /* 0x06 - high reporting speed, 0x05 - low speed */
+        rep_data[0] = 0x06; rep_data[1] = 0x00;
+        limit = 3;
+        do {
+                ret = hdev->hid_output_raw_report(hdev, rep_data, 2,
+                                HID_FEATURE_REPORT);
+        } while (ret < 0 && limit-- > 0);
+        if (ret < 0) {
+                dev_err(&hdev->dev, "failed to poke device #2, %d\n", ret);
+                goto err_free;
+        }
+
         hidinput = list_entry(hdev->inputs.next, struct hid_input, list);
         input = hidinput->input;