From patchwork Wed Jul 23 12:42:57 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nikolai Kondrashov X-Patchwork-Id: 4610351 X-Patchwork-Delegate: jikos@jikos.cz Return-Path: X-Original-To: patchwork-linux-input@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 1E448C0514 for ; Wed, 23 Jul 2014 12:43:32 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D390020173 for ; Wed, 23 Jul 2014 12:43:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9DB0D20172 for ; Wed, 23 Jul 2014 12:43:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752955AbaGWMn3 (ORCPT ); Wed, 23 Jul 2014 08:43:29 -0400 Received: from mail-wi0-f169.google.com ([209.85.212.169]:60215 "EHLO mail-wi0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751990AbaGWMn1 (ORCPT ); Wed, 23 Jul 2014 08:43:27 -0400 Received: by mail-wi0-f169.google.com with SMTP id n3so7458077wiv.2 for ; Wed, 23 Jul 2014 05:43:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=D/cJIMKb3r1Gd/SKAdDvmVwkhCfUSsfVQNJiF0UGSRA=; b=hlVQCk9SuMyasapELN8YY0mqEqdtDe/CTTvxgIJ+VuRfAt1EwT+gXN3XakimB8tiOL AGvUl2Gxp7DZL1Panw0DIlsmPDpi1Aqz7fLEaZMtrY36eu2RTBmc9LhP14PV7fTTV3wy TrOlkj2IeQEuca1WfRZg0FmG3GKwyakN9Vs78DOcjdOkMs7ShU8mh7P+SxLL67ThNOz0 QmTa2ak7U8CgP4symvA+KCOEHt/tvYt2qCj4hapcTZX94QfQirDhAu+EiwBwS3dVUJbx /4VmLvXmf/po/v+IXw/21mz8ggfjOqysI4n9KNSV2yYgtlP4X93BxOm0BvBWeS4ANKJ/ aIdw== X-Received: by 10.194.5.103 with SMTP id r7mr1458516wjr.41.1406119404444; Wed, 23 Jul 2014 05:43:24 -0700 (PDT) Received: from gimli.redhat.com (a88-114-29-97.elisa-laajakaista.fi. [88.114.29.97]) by mx.google.com with ESMTPSA id fw4sm8806681wib.19.2014.07.23.05.43.23 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 23 Jul 2014 05:43:23 -0700 (PDT) From: Nikolai Kondrashov To: Jiri Kosina Cc: linux-input@vger.kernel.org, DIGImend-devel , Nikolai Kondrashov Subject: [PATCH 4/5] hid: huion: Switch to generating report descriptor Date: Wed, 23 Jul 2014 15:42:57 +0300 Message-Id: <1406119378-24551-5-git-send-email-spbnick@gmail.com> X-Mailer: git-send-email 2.0.1 In-Reply-To: <1406119378-24551-1-git-send-email-spbnick@gmail.com> References: <1406119378-24551-1-git-send-email-spbnick@gmail.com> Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org X-Spam-Status: No, score=-6.8 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, T_DKIM_INVALID, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Switch to generating tablet pen report descriptor from a template and parameters retrieved from string descriptor 0x64. Signed-off-by: Nikolai Kondrashov Reviewed-by: Benjamin Tissoires --- drivers/hid/hid-huion.c | 245 +++++++++++++++++++++++++++++++++--------------- 1 file changed, 167 insertions(+), 78 deletions(-) diff --git a/drivers/hid/hid-huion.c b/drivers/hid/hid-huion.c index e5f1e22..e6f5338 100644 --- a/drivers/hid/hid-huion.c +++ b/drivers/hid/hid-huion.c @@ -16,67 +16,89 @@ #include #include #include +#include #include "usbhid/usbhid.h" #include "hid-ids.h" -/* Original tablet report descriptor size */ -#define HUION_TABLET_RDESC_ORIG_SIZE 177 - -/* Fixed tablet report descriptor */ -static __u8 huion_tablet_rdesc_fixed[] = { - 0x05, 0x0D, /* Usage Page (Digitizer), */ - 0x09, 0x02, /* Usage (Pen), */ - 0xA1, 0x01, /* Collection (Application), */ - 0x85, 0x07, /* Report ID (7), */ - 0x09, 0x20, /* Usage (Stylus), */ - 0xA0, /* Collection (Physical), */ - 0x14, /* Logical Minimum (0), */ - 0x25, 0x01, /* Logical Maximum (1), */ - 0x75, 0x01, /* Report Size (1), */ - 0x09, 0x42, /* Usage (Tip Switch), */ - 0x09, 0x44, /* Usage (Barrel Switch), */ - 0x09, 0x46, /* Usage (Tablet Pick), */ - 0x95, 0x03, /* Report Count (3), */ - 0x81, 0x02, /* Input (Variable), */ - 0x95, 0x03, /* Report Count (3), */ - 0x81, 0x03, /* Input (Constant, Variable), */ - 0x09, 0x32, /* Usage (In Range), */ - 0x95, 0x01, /* Report Count (1), */ - 0x81, 0x02, /* Input (Variable), */ - 0x95, 0x01, /* Report Count (1), */ - 0x81, 0x03, /* Input (Constant, Variable), */ - 0x75, 0x10, /* Report Size (16), */ - 0x95, 0x01, /* Report Count (1), */ - 0xA4, /* Push, */ - 0x05, 0x01, /* Usage Page (Desktop), */ - 0x65, 0x13, /* Unit (Inch), */ - 0x55, 0xFD, /* Unit Exponent (-3), */ - 0x34, /* Physical Minimum (0), */ - 0x09, 0x30, /* Usage (X), */ - 0x46, 0x40, 0x1F, /* Physical Maximum (8000), */ - 0x26, 0x00, 0x7D, /* Logical Maximum (32000), */ - 0x81, 0x02, /* Input (Variable), */ - 0x09, 0x31, /* Usage (Y), */ - 0x46, 0x88, 0x13, /* Physical Maximum (5000), */ - 0x26, 0x20, 0x4E, /* Logical Maximum (20000), */ - 0x81, 0x02, /* Input (Variable), */ - 0xB4, /* Pop, */ - 0x09, 0x30, /* Usage (Tip Pressure), */ - 0x26, 0xFF, 0x07, /* Logical Maximum (2047), */ - 0x81, 0x02, /* Input (Variable), */ - 0xC0, /* End Collection, */ - 0xC0 /* End Collection */ +/* Report descriptor template placeholder head */ +#define HUION_PH_HEAD 0xFE, 0xED, 0x1D + +/* Report descriptor template placeholder IDs */ +enum huion_ph_id { + HUION_PH_ID_X_LM, + HUION_PH_ID_X_PM, + HUION_PH_ID_Y_LM, + HUION_PH_ID_Y_PM, + HUION_PH_ID_PRESSURE_LM, + HUION_PH_ID_NUM +}; + +/* Report descriptor template placeholder */ +#define HUION_PH(_ID) HUION_PH_HEAD, HUION_PH_ID_##_ID + +/* Fixed report descriptor template */ +static const __u8 huion_tablet_rdesc_template[] = { + 0x05, 0x0D, /* Usage Page (Digitizer), */ + 0x09, 0x02, /* Usage (Pen), */ + 0xA1, 0x01, /* Collection (Application), */ + 0x85, 0x07, /* Report ID (7), */ + 0x09, 0x20, /* Usage (Stylus), */ + 0xA0, /* Collection (Physical), */ + 0x14, /* Logical Minimum (0), */ + 0x25, 0x01, /* Logical Maximum (1), */ + 0x75, 0x01, /* Report Size (1), */ + 0x09, 0x42, /* Usage (Tip Switch), */ + 0x09, 0x44, /* Usage (Barrel Switch), */ + 0x09, 0x46, /* Usage (Tablet Pick), */ + 0x95, 0x03, /* Report Count (3), */ + 0x81, 0x02, /* Input (Variable), */ + 0x95, 0x03, /* Report Count (3), */ + 0x81, 0x03, /* Input (Constant, Variable), */ + 0x09, 0x32, /* Usage (In Range), */ + 0x95, 0x01, /* Report Count (1), */ + 0x81, 0x02, /* Input (Variable), */ + 0x95, 0x01, /* Report Count (1), */ + 0x81, 0x03, /* Input (Constant, Variable), */ + 0x75, 0x10, /* Report Size (16), */ + 0x95, 0x01, /* Report Count (1), */ + 0xA4, /* Push, */ + 0x05, 0x01, /* Usage Page (Desktop), */ + 0x65, 0x13, /* Unit (Inch), */ + 0x55, 0xFD, /* Unit Exponent (-3), */ + 0x34, /* Physical Minimum (0), */ + 0x09, 0x30, /* Usage (X), */ + 0x27, HUION_PH(X_LM), /* Logical Maximum (PLACEHOLDER), */ + 0x47, HUION_PH(X_PM), /* Physical Maximum (PLACEHOLDER), */ + 0x81, 0x02, /* Input (Variable), */ + 0x09, 0x31, /* Usage (Y), */ + 0x27, HUION_PH(Y_LM), /* Logical Maximum (PLACEHOLDER), */ + 0x47, HUION_PH(Y_PM), /* Physical Maximum (PLACEHOLDER), */ + 0x81, 0x02, /* Input (Variable), */ + 0xB4, /* Pop, */ + 0x09, 0x30, /* Usage (Tip Pressure), */ + 0x27, + HUION_PH(PRESSURE_LM), /* Logical Maximum (PLACEHOLDER), */ + 0x81, 0x02, /* Input (Variable), */ + 0xC0, /* End Collection, */ + 0xC0 /* End Collection */ +}; + +/* Driver data */ +struct huion_drvdata { + __u8 *rdesc; + unsigned int rsize; }; static __u8 *huion_report_fixup(struct hid_device *hdev, __u8 *rdesc, unsigned int *rsize) { + struct huion_drvdata *drvdata = hid_get_drvdata(hdev); switch (hdev->product) { case USB_DEVICE_ID_HUION_TABLET: - if (*rsize == HUION_TABLET_RDESC_ORIG_SIZE) { - rdesc = huion_tablet_rdesc_fixed; - *rsize = sizeof(huion_tablet_rdesc_fixed); + if (drvdata->rdesc != NULL) { + rdesc = drvdata->rdesc; + *rsize = drvdata->rsize; } break; } @@ -84,57 +106,124 @@ static __u8 *huion_report_fixup(struct hid_device *hdev, __u8 *rdesc, } /** - * Enable fully-functional tablet mode by reading special string - * descriptor. + * Enable fully-functional tablet mode and determine device parameters. * * @hdev: HID device - * - * The specific string descriptor and data were discovered by sniffing - * the Windows driver traffic. */ static int huion_tablet_enable(struct hid_device *hdev) { int rc; - char buf[22]; + struct usb_device *usb_dev = hid_to_usb_dev(hdev); + struct huion_drvdata *drvdata = hid_get_drvdata(hdev); + u16 buf[6]; - rc = usb_string(hid_to_usb_dev(hdev), 0x64, buf, sizeof(buf)); - if (rc < 0) - return rc; + /* + * Read string descriptor containing tablet parameters. The specific + * string descriptor and data were discovered by sniffing the Windows + * driver traffic. + * NOTE: This enables fully-functional tablet mode. + */ + rc = usb_control_msg(usb_dev, usb_rcvctrlpipe(usb_dev, 0), + USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, + (USB_DT_STRING << 8) + 0x64, + 0x0409, buf, sizeof(buf), + USB_CTRL_GET_TIMEOUT); + if (rc == -EPIPE) + hid_warn(hdev, "device parameters not found\n"); + else if (rc < 0) + hid_warn(hdev, "failed to get device parameters: %d\n", rc); + else if (rc != sizeof(buf)) + hid_warn(hdev, "invalid device parameters\n"); + else { + s32 params[HUION_PH_ID_NUM]; + s32 resolution; + __u8 *p; + s32 v; + + /* Extract device parameters */ + params[HUION_PH_ID_X_LM] = le16_to_cpu(buf[1]); + params[HUION_PH_ID_Y_LM] = le16_to_cpu(buf[2]); + params[HUION_PH_ID_PRESSURE_LM] = le16_to_cpu(buf[4]); + resolution = le16_to_cpu(buf[5]); + if (resolution == 0) { + params[HUION_PH_ID_X_PM] = 0; + params[HUION_PH_ID_Y_PM] = 0; + } else { + params[HUION_PH_ID_X_PM] = params[HUION_PH_ID_X_LM] * + 1000 / resolution; + params[HUION_PH_ID_Y_PM] = params[HUION_PH_ID_Y_LM] * + 1000 / resolution; + } + + /* Allocate fixed report descriptor */ + drvdata->rdesc = devm_kmalloc(&hdev->dev, + sizeof(huion_tablet_rdesc_template), + GFP_KERNEL); + if (drvdata->rdesc == NULL) { + hid_err(hdev, "failed to allocate fixed rdesc\n"); + return -ENOMEM; + } + drvdata->rsize = sizeof(huion_tablet_rdesc_template); + + /* Format fixed report descriptor */ + memcpy(drvdata->rdesc, huion_tablet_rdesc_template, + drvdata->rsize); + for (p = drvdata->rdesc; + p <= drvdata->rdesc + drvdata->rsize - 4;) { + if (p[0] == 0xFE && p[1] == 0xED && p[2] == 0x1D && + p[3] < sizeof(params)) { + v = params[p[3]]; + put_unaligned(cpu_to_le32(v), (s32 *)p); + p += 4; + } else { + p++; + } + } + } return 0; } static int huion_probe(struct hid_device *hdev, const struct hid_device_id *id) { - int ret; - - ret = hid_parse(hdev); - if (ret) { - hid_err(hdev, "parse failed\n"); - goto err; - } + int rc; + struct usb_interface *intf = to_usb_interface(hdev->dev.parent); + struct huion_drvdata *drvdata; - ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); - if (ret) { - hid_err(hdev, "hw start failed\n"); - goto err; + /* Allocate and assign driver data */ + drvdata = devm_kzalloc(&hdev->dev, sizeof(*drvdata), GFP_KERNEL); + if (drvdata == NULL) { + hid_err(hdev, "failed to allocate driver data\n"); + return -ENOMEM; } + hid_set_drvdata(hdev, drvdata); switch (id->product) { case USB_DEVICE_ID_HUION_TABLET: - ret = huion_tablet_enable(hdev); - if (ret) { - hid_err(hdev, "tablet enabling failed\n"); - goto enabling_err; + /* If this is the pen interface */ + if (intf->cur_altsetting->desc.bInterfaceNumber == 0) { + rc = huion_tablet_enable(hdev); + if (rc) { + hid_err(hdev, "tablet enabling failed\n"); + return rc; + } } break; } + rc = hid_parse(hdev); + if (rc) { + hid_err(hdev, "parse failed\n"); + return rc; + } + + rc = hid_hw_start(hdev, HID_CONNECT_DEFAULT); + if (rc) { + hid_err(hdev, "hw start failed\n"); + return rc; + } + return 0; -enabling_err: - hid_hw_stop(hdev); -err: - return ret; } static int huion_raw_event(struct hid_device *hdev, struct hid_report *report,