--- /dev/null
+/* -*- linux-c -*-
+
+GTCO digitizer USB driver
+
+TO CHECK: Is pressure done right on report 5?
+
+Copyright (C) 2006 GTCO CalComp
+
+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; version 2
+of the License.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation, and that the name of GTCO-CalComp not be used in advertising
+or publicity pertaining to distribution of the software without specific,
+written prior permission. GTCO-CalComp makes no representations about the
+suitability of this software for any purpose. It is provided "as is"
+without express or implied warranty.
+
+GTCO-CALCOMP DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+EVENT SHALL GTCO-CALCOMP BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTIONS, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.
+
+GTCO CalComp, Inc.
+7125 Riverwood Drive
+Columbia, MD 21046
+
+Jeremy Roberson jroberson@gtcocalcomp.com
+Scott Hill shill@gtcocalcomp.com
+*/
+
+
+
+/*#define DEBUG*/
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/usb.h>
+#include <asm/uaccess.h>
+#include <asm/unaligned.h>
+#include <asm/byteorder.h>
+#include <linux/bitops.h>
+
+#include <linux/usb/input.h>
+
+/* Version with a Major number of 2 is for kernel inclusion only. */
+#define GTCO_VERSION "2.00.0006"
+
+
+/* MACROS */
+
+#define VENDOR_ID_GTCO 0x078C
+#define PID_400 0x400
+#define PID_401 0x401
+#define PID_1000 0x1000
+#define PID_1001 0x1001
+#define PID_1002 0x1002
+
+/* Max size of a single report */
+#define REPORT_MAX_SIZE 10
+
+
+/* Bitmask whether pen is in range */
+#define MASK_INRANGE 0x20
+#define MASK_BUTTON 0x01F
+
+#define PATHLENGTH 64
+
+/* DATA STRUCTURES */
+
+/* Device table */
+static const struct usb_device_id gtco_usbid_table[] = {
+ { USB_DEVICE(VENDOR_ID_GTCO, PID_400) },
+ { USB_DEVICE(VENDOR_ID_GTCO, PID_401) },
+ { USB_DEVICE(VENDOR_ID_GTCO, PID_1000) },
+ { USB_DEVICE(VENDOR_ID_GTCO, PID_1001) },
+ { USB_DEVICE(VENDOR_ID_GTCO, PID_1002) },
+ { }
+};
+MODULE_DEVICE_TABLE (usb, gtco_usbid_table);
+
+
+/* Structure to hold all of our device specific stuff */
+struct gtco {
+
+ struct input_dev *inputdevice; /* input device struct pointer */
+ struct usb_device *usbdev; /* the usb device for this device */
+ struct usb_interface *intf; /* the usb interface for this device */
+ struct urb *urbinfo; /* urb for incoming reports */
+ dma_addr_t buf_dma; /* dma addr of the data buffer*/
+ unsigned char * buffer; /* databuffer for reports */
+
+ char usbpath[PATHLENGTH];
+ int openCount;
+
+ /* Information pulled from Report Descriptor */
+ u32 usage;
+ u32 min_X;
+ u32 max_X;
+ u32 min_Y;
+ u32 max_Y;
+ s8 mintilt_X;
+ s8 maxtilt_X;
+ s8 mintilt_Y;
+ s8 maxtilt_Y;
+ u32 maxpressure;
+ u32 minpressure;
+};
+
+
+
+/* Code for parsing the HID REPORT DESCRIPTOR */
+
+/* From HID1.11 spec */
+struct hid_descriptor
+{
+ struct usb_descriptor_header header;
+ __le16 bcdHID;
+ u8 bCountryCode;
+ u8 bNumDescriptors;
+ u8 bDescriptorType;
+ __le16 wDescriptorLength;
+} __attribute__ ((packed));
+
+
+#define HID_DESCRIPTOR_SIZE 9
+#define HID_DEVICE_TYPE 33
+#define REPORT_DEVICE_TYPE 34
+
+
+#define PREF_TAG(x) ((x)>>4)
+#define PREF_TYPE(x) ((x>>2)&0x03)
+#define PREF_SIZE(x) ((x)&0x03)
+
+#define TYPE_MAIN 0
+#define TYPE_GLOBAL 1
+#define TYPE_LOCAL 2
+#define TYPE_RESERVED 3
+
+#define TAG_MAIN_INPUT 0x8
+#define TAG_MAIN_OUTPUT 0x9
+#define TAG_MAIN_FEATURE 0xB
+#define TAG_MAIN_COL_START 0xA
+#define TAG_MAIN_COL_END 0xC
+
+#define TAG_GLOB_USAGE 0
+#define TAG_GLOB_LOG_MIN 1
+#define TAG_GLOB_LOG_MAX 2
+#define TAG_GLOB_PHYS_MIN 3
+#define TAG_GLOB_PHYS_MAX 4
+#define TAG_GLOB_UNIT_EXP 5
+#define TAG_GLOB_UNIT 6
+#define TAG_GLOB_REPORT_SZ 7
+#define TAG_GLOB_REPORT_ID 8
+#define TAG_GLOB_REPORT_CNT 9
+#define TAG_GLOB_PUSH 10
+#define TAG_GLOB_POP 11
+
+#define TAG_GLOB_MAX 12
+
+#define DIGITIZER_USAGE_TIP_PRESSURE 0x30
+#define DIGITIZER_USAGE_TILT_X 0x3D
+#define DIGITIZER_USAGE_TILT_Y 0x3E
+
+
+/*
+ * This is an abbreviated parser for the HID Report Descriptor. We
+ * know what devices we are talking to, so this is by no means meant
+ * to be generic. We can make some safe assumptions:
+ *
+ * - We know there are no LONG tags, all short
+ * - We know that we have no MAIN Feature and MAIN Output items
+ * - We know what the IRQ reports are supposed to look like.
+ *
+ * The main purpose of this is to use the HID report desc to figure
+ * out the mins and maxs of the fields in the IRQ reports. The IRQ
+ * reports for 400/401 change slightly if the max X is bigger than 64K.
+ *
+ */
+static void parse_hid_report_descriptor(struct gtco *device, char * report,
+ int length)
+{
+ struct device *ddev = &device->intf->dev;
+ int x, i = 0;
+
+ /* Tag primitive vars */
+ __u8 prefix;
+ __u8 size;
+ __u8 tag;
+ __u8 type;
+ __u8 data = 0;
+ __u16 data16 = 0;
+ __u32 data32 = 0;
+
+ /* For parsing logic */
+ int inputnum = 0;
+ __u32 usage = 0;
+
+ /* Global Values, indexed by TAG */
+ __u32 globalval[TAG_GLOB_MAX];
+ __u32 oldval[TAG_GLOB_MAX];
+
+ /* Debug stuff */
+ char maintype = 'x';
+ char globtype[12];
+ int indent = 0;
+ char indentstr[10] = "";
+
+
+ dev_dbg(ddev, "======>>>>>>PARSE<<<<<<======\n");
+
+ /* Walk this report and pull out the info we need */
+ while (i < length) {
+ prefix = report[i];
+
+ /* Skip over prefix */
+ i++;
+
+ /* Determine data size and save the data in the proper variable */
+ size = PREF_SIZE(prefix);
+ switch (size) {
+ case 1:
+ data = report[i];
+ break;
+ case 2:
+ data16 = get_unaligned_le16(&report[i]);
+ break;
+ case 3:
+ size = 4;
+ data32 = get_unaligned_le32(&report[i]);
+ break;
+ }
+
+ /* Skip size of data */
+ i += size;
+
+ /* What we do depends on the tag type */
+ tag = PREF_TAG(prefix);
+ type = PREF_TYPE(prefix);
+ switch (type) {
+ case TYPE_MAIN:
+ strcpy(globtype, "");
+ switch (tag) {
+
+ case TAG_MAIN_INPUT:
+ /*
+ * The INPUT MAIN tag signifies this is
+ * information from a report. We need to
+ * figure out what it is and store the
+ * min/max values
+ */
+
+ maintype = 'I';
+ if (data == 2)
+ strcpy(globtype, "Variable");
+ else if (data == 3)
+ strcpy(globtype, "Var|Const");
+
+ dev_dbg(ddev, "::::: Saving Report: %d input #%d Max: 0x%X(%d) Min:0x%X(%d) of %d bits\n",
+ globalval[TAG_GLOB_REPORT_ID], inputnum,
+ globalval[TAG_GLOB_LOG_MAX], globalval[TAG_GLOB_LOG_MAX],
+ globalval[TAG_GLOB_LOG_MIN], globalval[TAG_GLOB_LOG_MIN],
+ globalval[TAG_GLOB_REPORT_SZ] * globalval[TAG_GLOB_REPORT_CNT]);
+
+
+ /*
+ We can assume that the first two input items
+ are always the X and Y coordinates. After
+ that, we look for everything else by
+ local usage value
+ */
+ switch (inputnum) {
+ case 0: /* X coord */
+ dev_dbg(ddev, "GER: X Usage: 0x%x\n", usage);
+ if (device->max_X == 0) {
+ device->max_X = globalval[TAG_GLOB_LOG_MAX];
+ device->min_X = globalval[TAG_GLOB_LOG_MIN];
+ }
+ break;
+
+ case 1: /* Y coord */
+ dev_dbg(ddev, "GER: Y Usage: 0x%x\n", usage);
+ if (device->max_Y == 0) {
+ device->max_Y = globalval[TAG_GLOB_LOG_MAX];
+ device->min_Y = globalval[TAG_GLOB_LOG_MIN];
+ }
+ break;
+
+ default:
+ /* Tilt X */
+ if (usage == DIGITIZER_USAGE_TILT_X) {
+ if (device->maxtilt_X == 0) {
+ device->maxtilt_X = globalval[TAG_GLOB_LOG_MAX];
+ device->mintilt_X = globalval[TAG_GLOB_LOG_MIN];
+ }
+ }
+
+ /* Tilt Y */
+ if (usage == DIGITIZER_USAGE_TILT_Y) {
+ if (device->maxtilt_Y == 0) {
+ device->maxtilt_Y = globalval[TAG_GLOB_LOG_MAX];
+ device->mintilt_Y = globalval[TAG_GLOB_LOG_MIN];
+ }
+ }
+
+ /* Pressure */
+ if (usage == DIGITIZER_USAGE_TIP_PRESSURE) {
+ if (device->maxpressure == 0) {
+ device->maxpressure = globalval[TAG_GLOB_LOG_MAX];
+ device->minpressure = globalval[TAG_GLOB_LOG_MIN];
+ }
+ }
+
+ break;
+ }
+
+ inputnum++;
+ break;
+
+ case TAG_MAIN_OUTPUT:
+ maintype = 'O';
+ break;
+
+ case TAG_MAIN_FEATURE:
+ maintype = 'F';
+ break;
+
+ case TAG_MAIN_COL_START:
+ maintype = 'S';
+
+ if (data == 0) {
+ dev_dbg(ddev, "======>>>>>> Physical\n");
+ strcpy(globtype, "Physical");
+ } else
+ dev_dbg(ddev, "======>>>>>>\n");
+
+ /* Indent the debug output */
+ indent++;
+ for (x = 0; x < indent; x++)
+ indentstr[x] = '-';
+ indentstr[x] = 0;
+
+ /* Save global tags */
+ for (x = 0; x < TAG_GLOB_MAX; x++)
+ oldval[x] = globalval[x];
+
+ break;
+
+ case TAG_MAIN_COL_END:
+ dev_dbg(ddev, "<<<<<<======\n");
+ maintype = 'E';
+ indent--;
+ for (x = 0; x < indent; x++)
+ indentstr[x] = '-';
+ indentstr[x] = 0;
+
+ /* Copy global tags back */
+ for (x = 0; x < TAG_GLOB_MAX; x++)
+ globalval[x] = oldval[x];
+
+ break;
+ }
+
+ switch (size) {
+ case 1:
+ dev_dbg(ddev, "%sMAINTAG:(%d) %c SIZE: %d Data: %s 0x%x\n",
+ indentstr, tag, maintype, size, globtype, data);
+ break;
+
+ case 2:
+ dev_dbg(ddev, "%sMAINTAG:(%d) %c SIZE: %d Data: %s 0x%x\n",
+ indentstr, tag, maintype, size, globtype, data16);
+ break;
+
+ case 4:
+ dev_dbg(ddev, "%sMAINTAG:(%d) %c SIZE: %d Data: %s 0x%x\n",
+ indentstr, tag, maintype, size, globtype, data32);
+ break;
+ }
+ break;
+
+ case TYPE_GLOBAL:
+ switch (tag) {
+ case TAG_GLOB_USAGE:
+ /*
+ * First time we hit the global usage tag,
+ * it should tell us the type of device
+ */
+ if (device->usage == 0)
+ device->usage = data;
+
+ strcpy(globtype, "USAGE");
+ break;
+
+ case TAG_GLOB_LOG_MIN:
+ strcpy(globtype, "LOG_MIN");
+ break;
+
+ case TAG_GLOB_LOG_MAX:
+ strcpy(globtype, "LOG_MAX");
+ break;
+
+ case TAG_GLOB_PHYS_MIN:
+ strcpy(globtype, "PHYS_MIN");
+ break;
+
+ case TAG_GLOB_PHYS_MAX:
+ strcpy(globtype, "PHYS_MAX");
+ break;
+
+ case TAG_GLOB_UNIT_EXP:
+ strcpy(globtype, "EXP");
+ break;
+
+ case TAG_GLOB_UNIT:
+ strcpy(globtype, "UNIT");
+ break;
+
+ case TAG_GLOB_REPORT_SZ:
+ strcpy(globtype, "REPORT_SZ");
+ break;
+
+ case TAG_GLOB_REPORT_ID:
+ strcpy(globtype, "REPORT_ID");
+ /* New report, restart numbering */
+ inputnum = 0;
+ break;
+
+ case TAG_GLOB_REPORT_CNT:
+ strcpy(globtype, "REPORT_CNT");
+ break;
+
+ case TAG_GLOB_PUSH:
+ strcpy(globtype, "PUSH");
+ break;
+
+ case TAG_GLOB_POP:
+ strcpy(globtype, "POP");
+ break;
+ }
+
+ /* Check to make sure we have a good tag number
+ so we don't overflow array */
+ if (tag < TAG_GLOB_MAX) {
+ switch (size) {
+ case 1:
+ dev_dbg(ddev, "%sGLOBALTAG:%s(%d) SIZE: %d Data: 0x%x\n",
+ indentstr, globtype, tag, size, data);
+ globalval[tag] = data;
+ break;
+
+ case 2:
+ dev_dbg(ddev, "%sGLOBALTAG:%s(%d) SIZE: %d Data: 0x%x\n",
+ indentstr, globtype, tag, size, data16);
+ globalval[tag] = data16;
+ break;
+
+ case 4:
+ dev_dbg(ddev, "%sGLOBALTAG:%s(%d) SIZE: %d Data: 0x%x\n",
+ indentstr, globtype, tag, size, data32);
+ globalval[tag] = data32;
+ break;
+ }
+ } else {
+ dev_dbg(ddev, "%sGLOBALTAG: ILLEGAL TAG:%d SIZE: %d\n",
+ indentstr, tag, size);
+ }
+ break;
+
+ case TYPE_LOCAL:
+ switch (tag) {
+ case TAG_GLOB_USAGE:
+ strcpy(globtype, "USAGE");
+ /* Always 1 byte */
+ usage = data;
+ break;
+
+ case TAG_GLOB_LOG_MIN:
+ strcpy(globtype, "MIN");
+ break;
+
+ case TAG_GLOB_LOG_MAX:
+ strcpy(globtype, "MAX");
+ break;
+
+ default:
+ strcpy(globtype, "UNKNOWN");
+ break;
+ }
+
+ switch (size) {
+ case 1:
+ dev_dbg(ddev, "%sLOCALTAG:(%d) %s SIZE: %d Data: 0x%x\n",
+ indentstr, tag, globtype, size, data);
+ break;
+
+ case 2:
+ dev_dbg(ddev, "%sLOCALTAG:(%d) %s SIZE: %d Data: 0x%x\n",
+ indentstr, tag, globtype, size, data16);
+ break;
+
+ case 4:
+ dev_dbg(ddev, "%sLOCALTAG:(%d) %s SIZE: %d Data: 0x%x\n",
+ indentstr, tag, globtype, size, data32);
+ break;
+ }
+
+ break;
+ }
+ }
+}
+
+/* INPUT DRIVER Routines */
+
+/*
+ * Called when opening the input device. This will submit the URB to
+ * the usb system so we start getting reports
+ */
+static int gtco_input_open(struct input_dev *inputdev)
+{
+ struct gtco *device = input_get_drvdata(inputdev);
+
+ device->urbinfo->dev = device->usbdev;
+ if (usb_submit_urb(device->urbinfo, GFP_KERNEL))
+ return -EIO;
+
+ return 0;
+}
+
+/*
+ * Called when closing the input device. This will unlink the URB
+ */
+static void gtco_input_close(struct input_dev *inputdev)
+{
+ struct gtco *device = input_get_drvdata(inputdev);
+
+ usb_kill_urb(device->urbinfo);
+}
+
+
+/*
+ * Setup input device capabilities. Tell the input system what this
+ * device is capable of generating.
+ *
+ * This information is based on what is read from the HID report and
+ * placed in the struct gtco structure
+ *
+ */
+static void gtco_setup_caps(struct input_dev *inputdev)
+{
+ struct gtco *device = input_get_drvdata(inputdev);
+
+ /* Which events */
+ inputdev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) |
+ BIT_MASK(EV_MSC);
+
+ /* Misc event menu block */
+ inputdev->mscbit[0] = BIT_MASK(MSC_SCAN) | BIT_MASK(MSC_SERIAL) |
+ BIT_MASK(MSC_RAW);
+
+ /* Absolute values based on HID report info */
+ input_set_abs_params(inputdev, ABS_X, device->min_X, device->max_X,
+ 0, 0);
+ input_set_abs_params(inputdev, ABS_Y, device->min_Y, device->max_Y,
+ 0, 0);
+
+ /* Proximity */
+ input_set_abs_params(inputdev, ABS_DISTANCE, 0, 1, 0, 0);
+
+ /* Tilt & pressure */
+ input_set_abs_params(inputdev, ABS_TILT_X, device->mintilt_X,
+ device->maxtilt_X, 0, 0);
+ input_set_abs_params(inputdev, ABS_TILT_Y, device->mintilt_Y,
+ device->maxtilt_Y, 0, 0);
+ input_set_abs_params(inputdev, ABS_PRESSURE, device->minpressure,
+ device->maxpressure, 0, 0);
+
+ /* Transducer */
+ input_set_abs_params(inputdev, ABS_MISC, 0, 0xFF, 0, 0);
+}
+
+/* USB Routines */
+
+/*
+ * URB callback routine. Called when we get IRQ reports from the
+ * digitizer.
+ *
+ * This bridges the USB and input device worlds. It generates events
+ * on the input device based on the USB reports.
+ */
+static void gtco_urb_callback(struct urb *urbinfo)
+{
+ struct gtco *device = urbinfo->context;
+ struct input_dev *inputdev;
+ int rc;
+ u32 val = 0;
+ char le_buffer[2];
+
+ inputdev = device->inputdevice;
+
+ /* Was callback OK? */
+ if (urbinfo->status == -ECONNRESET ||
+ urbinfo->status == -ENOENT ||
+ urbinfo->status == -ESHUTDOWN) {
+
+ /* Shutdown is occurring. Return and don't queue up any more */
+ return;
+ }
+
+ if (urbinfo->status != 0) {
+ /*
+ * Some unknown error. Hopefully temporary. Just go and
+ * requeue an URB
+ */
+ goto resubmit;
+ }
+
+ /*
+ * Good URB, now process
+ */
+
+ /* PID dependent when we interpret the report */
+ if (inputdev->id.product == PID_1000 ||
+ inputdev->id.product == PID_1001 ||
+ inputdev->id.product == PID_1002) {
+
+ /*
+ * Switch on the report ID
+ * Conveniently, the reports have more information, the higher
+ * the report number. We can just fall through the case
+ * statements if we start with the highest number report
+ */
+ switch (device->buffer[0]) {
+ case 5:
+ /* Pressure is 9 bits */
+ val = ((u16)(device->buffer[8]) << 1);
+ val |= (u16)(device->buffer[7] >> 7);
+ input_report_abs(inputdev, ABS_PRESSURE,
+ device->buffer[8]);
+
+ /* Mask out the Y tilt value used for pressure */
+ device->buffer[7] = (u8)((device->buffer[7]) & 0x7F);
+
+ /* Fall thru */
+ case 4:
+ /* Tilt */
+ input_report_abs(inputdev, ABS_TILT_X,
+ sign_extend32(device->buffer[6], 6));
+
+ input_report_abs(inputdev, ABS_TILT_Y,
+ sign_extend32(device->buffer[7], 6));
+
+ /* Fall thru */
+ case 2:
+ case 3:
+ /* Convert buttons, only 5 bits possible */
+ val = (device->buffer[5]) & MASK_BUTTON;
+
+ /* We don't apply any meaning to the bitmask,
+ just report */
+ input_event(inputdev, EV_MSC, MSC_SERIAL, val);
+
+ /* Fall thru */
+ case 1:
+ /* All reports have X and Y coords in the same place */
+ val = get_unaligned_le16(&device->buffer[1]);
+ input_report_abs(inputdev, ABS_X, val);
+
+ val = get_unaligned_le16(&device->buffer[3]);
+ input_report_abs(inputdev, ABS_Y, val);
+
+ /* Ditto for proximity bit */
+ val = device->buffer[5] & MASK_INRANGE ? 1 : 0;
+ input_report_abs(inputdev, ABS_DISTANCE, val);
+
+ /* Report 1 is an exception to how we handle buttons */
+ /* Buttons are an index, not a bitmask */
+ if (device->buffer[0] == 1) {
+
+ /*
+ * Convert buttons, 5 bit index
+ * Report value of index set as one,
+ * the rest as 0
+ */
+ val = device->buffer[5] & MASK_BUTTON;
+ dev_dbg(&device->intf->dev,
+ "======>>>>>>REPORT 1: val 0x%X(%d)\n",
+ val, val);
+
+ /*
+ * We don't apply any meaning to the button
+ * index, just report it
+ */
+ input_event(inputdev, EV_MSC, MSC_SERIAL, val);
+ }
+ break;
+
+ case 7:
+ /* Menu blocks */
+ input_event(inputdev, EV_MSC, MSC_SCAN,
+ device->buffer[1]);
+ break;
+ }
+ }
+
+ /* Other pid class */
+ if (inputdev->id.product == PID_400 ||
+ inputdev->id.product == PID_401) {
+
+ /* Report 2 */
+ if (device->buffer[0] == 2) {
+ /* Menu blocks */
+ input_event(inputdev, EV_MSC, MSC_SCAN, device->buffer[1]);
+ }
+
+ /* Report 1 */
+ if (device->buffer[0] == 1) {
+ char buttonbyte;
+
+ /* IF X max > 64K, we still a bit from the y report */
+ if (device->max_X > 0x10000) {
+
+ val = (u16)(((u16)(device->buffer[2] << 8)) | (u8)device->buffer[1]);
+ val |= (u32)(((u8)device->buffer[3] & 0x1) << 16);
+
+ input_report_abs(inputdev, ABS_X, val);
+
+ le_buffer[0] = (u8)((u8)(device->buffer[3]) >> 1);
+ le_buffer[0] |= (u8)((device->buffer[3] & 0x1) << 7);
+
+ le_buffer[1] = (u8)(device->buffer[4] >> 1);
+ le_buffer[1] |= (u8)((device->buffer[5] & 0x1) << 7);
+
+ val = get_unaligned_le16(le_buffer);
+ input_report_abs(inputdev, ABS_Y, val);
+
+ /*
+ * Shift the button byte right by one to
+ * make it look like the standard report
+ */
+ buttonbyte = device->buffer[5] >> 1;
+ } else {
+
+ val = get_unaligned_le16(&device->buffer[1]);
+ input_report_abs(inputdev, ABS_X, val);
+
+ val = get_unaligned_le16(&device->buffer[3]);
+ input_report_abs(inputdev, ABS_Y, val);
+
+ buttonbyte = device->buffer[5];
+ }
+
+ /* BUTTONS and PROXIMITY */
+ val = buttonbyte & MASK_INRANGE ? 1 : 0;
+ input_report_abs(inputdev, ABS_DISTANCE, val);
+
+ /* Convert buttons, only 4 bits possible */
+ val = buttonbyte & 0x0F;
+#ifdef USE_BUTTONS
+ for (i = 0; i < 5; i++)
+ input_report_key(inputdev, BTN_DIGI + i, val & (1 << i));
+#else
+ /* We don't apply any meaning to the bitmask, just report */
+ input_event(inputdev, EV_MSC, MSC_SERIAL, val);
+#endif
+
+ /* TRANSDUCER */
+ input_report_abs(inputdev, ABS_MISC, device->buffer[6]);
+ }
+ }
+
+ /* Everybody gets report ID's */
+ input_event(inputdev, EV_MSC, MSC_RAW, device->buffer[0]);
+
+ /* Sync it up */
+ input_sync(inputdev);
+
+ resubmit:
+ rc = usb_submit_urb(urbinfo, GFP_ATOMIC);
+ if (rc != 0)
+ dev_err(&device->intf->dev,
+ "usb_submit_urb failed rc=0x%x\n", rc);
+}
+
+/*
+ * The probe routine. This is called when the kernel find the matching USB
+ * vendor/product. We do the following:
+ *
+ * - Allocate mem for a local structure to manage the device
+ * - Request a HID Report Descriptor from the device and parse it to
+ * find out the device parameters
+ * - Create an input device and assign it attributes
+ * - Allocate an URB so the device can talk to us when the input
+ * queue is open
+ */
+static int gtco_probe(struct usb_interface *usbinterface,
+ const struct usb_device_id *id)
+{
+
+ struct gtco *gtco;
+ struct input_dev *input_dev;
+ struct hid_descriptor *hid_desc;
+ char *report;
+ int result = 0, retry;
+ int error;
+ struct usb_endpoint_descriptor *endpoint;
+
+ /* Allocate memory for device structure */
+ gtco = kzalloc(sizeof(struct gtco), GFP_KERNEL);
+ input_dev = input_allocate_device();
+ if (!gtco || !input_dev) {
+ dev_err(&usbinterface->dev, "No more memory\n");
+ error = -ENOMEM;
+ goto err_free_devs;
+ }
+
+ /* Set pointer to the input device */
+ gtco->inputdevice = input_dev;
+
+ /* Save interface information */
+ gtco->usbdev = interface_to_usbdev(usbinterface);
+ gtco->intf = usbinterface;
+
+ /* Allocate some data for incoming reports */
+ gtco->buffer = usb_alloc_coherent(gtco->usbdev, REPORT_MAX_SIZE,
+ GFP_KERNEL, >co->buf_dma);
+ if (!gtco->buffer) {
+ dev_err(&usbinterface->dev, "No more memory for us buffers\n");
+ error = -ENOMEM;
+ goto err_free_devs;
+ }
+
+ /* Allocate URB for reports */
+ gtco->urbinfo = usb_alloc_urb(0, GFP_KERNEL);
+ if (!gtco->urbinfo) {
+ dev_err(&usbinterface->dev, "Failed to allocate URB\n");
+ error = -ENOMEM;
+ goto err_free_buf;
+ }
+
+ /*
+ * The endpoint is always altsetting 0, we know this since we know
+ * this device only has one interrupt endpoint
+ */
+ endpoint = &usbinterface->altsetting[0].endpoint[0].desc;
+
+ /* Some debug */
+ dev_dbg(&usbinterface->dev, "gtco # interfaces: %d\n", usbinterface->num_altsetting);
+ dev_dbg(&usbinterface->dev, "num endpoints: %d\n", usbinterface->cur_altsetting->desc.bNumEndpoints);
+ dev_dbg(&usbinterface->dev, "interface class: %d\n", usbinterface->cur_altsetting->desc.bInterfaceClass);
+ dev_dbg(&usbinterface->dev, "endpoint: attribute:0x%x type:0x%x\n", endpoint->bmAttributes, endpoint->bDescriptorType);
+ if (usb_endpoint_xfer_int(endpoint))
+ dev_dbg(&usbinterface->dev, "endpoint: we have interrupt endpoint\n");
+
+ dev_dbg(&usbinterface->dev, "endpoint extra len:%d\n", usbinterface->altsetting[0].extralen);
+
+ /*
+ * Find the HID descriptor so we can find out the size of the
+ * HID report descriptor
+ */
+ if (usb_get_extra_descriptor(usbinterface->cur_altsetting,
+ HID_DEVICE_TYPE, &hid_desc) != 0){
+ dev_err(&usbinterface->dev,
+ "Can't retrieve exta USB descriptor to get hid report descriptor length\n");
+ error = -EIO;
+ goto err_free_urb;
+ }
+
+ dev_dbg(&usbinterface->dev,
+ "Extra descriptor success: type:%d len:%d\n",
+ hid_desc->bDescriptorType, hid_desc->wDescriptorLength);
+
+ report = kzalloc(le16_to_cpu(hid_desc->wDescriptorLength), GFP_KERNEL);
+ if (!report) {
+ dev_err(&usbinterface->dev, "No more memory for report\n");
+ error = -ENOMEM;
+ goto err_free_urb;
+ }
+
+ /* Couple of tries to get reply */
+ for (retry = 0; retry < 3; retry++) {
+ result = usb_control_msg(gtco->usbdev,
+ usb_rcvctrlpipe(gtco->usbdev, 0),
+ USB_REQ_GET_DESCRIPTOR,
+ USB_RECIP_INTERFACE | USB_DIR_IN,
+ REPORT_DEVICE_TYPE << 8,
+ 0, /* interface */
+ report,
+ le16_to_cpu(hid_desc->wDescriptorLength),
+ 5000); /* 5 secs */
+
+ dev_dbg(&usbinterface->dev, "usb_control_msg result: %d\n", result);
+ if (result == le16_to_cpu(hid_desc->wDescriptorLength)) {
+ parse_hid_report_descriptor(gtco, report, result);
+ break;
+ }
+ }
+
+ kfree(report);
+
+ /* If we didn't get the report, fail */
+ if (result != le16_to_cpu(hid_desc->wDescriptorLength)) {
+ dev_err(&usbinterface->dev,
+ "Failed to get HID Report Descriptor of size: %d\n",
+ hid_desc->wDescriptorLength);
+ error = -EIO;
+ goto err_free_urb;
+ }
+
+ /* Create a device file node */
+ usb_make_path(gtco->usbdev, gtco->usbpath, sizeof(gtco->usbpath));
+ strlcat(gtco->usbpath, "/input0", sizeof(gtco->usbpath));
+
+ /* Set Input device functions */
+ input_dev->open = gtco_input_open;
+ input_dev->close = gtco_input_close;
+
+ /* Set input device information */
+ input_dev->name = "GTCO_CalComp";
+ input_dev->phys = gtco->usbpath;
+
+ input_set_drvdata(input_dev, gtco);
+
+ /* Now set up all the input device capabilities */
+ gtco_setup_caps(input_dev);
+
+ /* Set input device required ID information */
+ usb_to_input_id(gtco->usbdev, &input_dev->id);
+ input_dev->dev.parent = &usbinterface->dev;
+
+ /* Setup the URB, it will be posted later on open of input device */
+ endpoint = &usbinterface->altsetting[0].endpoint[0].desc;
+
+ usb_fill_int_urb(gtco->urbinfo,
+ gtco->usbdev,
+ usb_rcvintpipe(gtco->usbdev,
+ endpoint->bEndpointAddress),
+ gtco->buffer,
+ REPORT_MAX_SIZE,
+ gtco_urb_callback,
+ gtco,
+ endpoint->bInterval);
+
+ gtco->urbinfo->transfer_dma = gtco->buf_dma;
+ gtco->urbinfo->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+
+ /* Save gtco pointer in USB interface gtco */
+ usb_set_intfdata(usbinterface, gtco);
+
+ /* All done, now register the input device */
+ error = input_register_device(input_dev);
+ if (error)
+ goto err_free_urb;
+
+ return 0;
+
+ err_free_urb:
+ usb_free_urb(gtco->urbinfo);
+ err_free_buf:
+ usb_free_coherent(gtco->usbdev, REPORT_MAX_SIZE,
+ gtco->buffer, gtco->buf_dma);
+ err_free_devs:
+ input_free_device(input_dev);
+ kfree(gtco);
+ return error;
+}
+
+/*
+ * This function is a standard USB function called when the USB device
+ * is disconnected. We will get rid of the URV, de-register the input
+ * device, and free up allocated memory
+ */
+static void gtco_disconnect(struct usb_interface *interface)
+{
+ /* Grab private device ptr */
+ struct gtco *gtco = usb_get_intfdata(interface);
+
+ /* Now reverse all the registration stuff */
+ if (gtco) {
+ input_unregister_device(gtco->inputdevice);
+ usb_kill_urb(gtco->urbinfo);
+ usb_free_urb(gtco->urbinfo);
+ usb_free_coherent(gtco->usbdev, REPORT_MAX_SIZE,
+ gtco->buffer, gtco->buf_dma);
+ kfree(gtco);
+ }
+
+ dev_info(&interface->dev, "gtco driver disconnected\n");
+}
+
+/* STANDARD MODULE LOAD ROUTINES */
+
+static struct usb_driver gtco_driverinfo_table = {
+ .name = "gtco",
+ .id_table = gtco_usbid_table,
+ .probe = gtco_probe,
+ .disconnect = gtco_disconnect,
+};
+
+module_usb_driver(gtco_driverinfo_table);
+
+MODULE_DESCRIPTION("GTCO digitizer USB driver");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff