--- /dev/null
+/*
+ * Generic linux-input device driver for axis-bearing devices
+ *
+ * Copyright (c) 2001 Brian S. Julin
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions, and the following disclaimer,
+ * without modification.
+ * 2. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL").
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ *
+ * References:
+ * HP-HIL Technical Reference Manual. Hewlett Packard Product No. 45918A
+ *
+ */
+
+#include <linux/hil.h>
+#include <linux/input.h>
+#include <linux/serio.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/pci_ids.h>
+
+#define PREFIX "HIL PTR: "
+#define HIL_GENERIC_NAME "HIL pointer device"
+
+MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>");
+MODULE_DESCRIPTION(HIL_GENERIC_NAME " driver");
+MODULE_LICENSE("Dual BSD/GPL");
+
+
+#define TABLET_SIMULATES_MOUSE /* allow tablet to be used as mouse */
+#undef TABLET_AUTOADJUST /* auto-adjust valid tablet ranges */
+
+
+#define HIL_PTR_MAX_LENGTH 16
+
+struct hil_ptr {
+ struct input_dev dev;
+ struct serio *serio;
+
+ /* Input buffer and index for packets from HIL bus. */
+ hil_packet data[HIL_PTR_MAX_LENGTH];
+ int idx4; /* four counts per packet */
+
+ /* Raw device info records from HIL bus, see hil.h for fields. */
+ char idd[HIL_PTR_MAX_LENGTH]; /* DID byte and IDD record */
+ char rsc[HIL_PTR_MAX_LENGTH]; /* RSC record */
+ char exd[HIL_PTR_MAX_LENGTH]; /* EXD record */
+ char rnm[HIL_PTR_MAX_LENGTH + 1]; /* RNM record + NULL term. */
+
+ /* Extra device details not contained in struct input_dev. */
+ unsigned int nbtn, naxes;
+ unsigned int btnmap[7];
+
+ /* Something to sleep around with. */
+ struct semaphore sem;
+};
+
+/* Process a complete packet after transfer from the HIL */
+static void hil_ptr_process_record(struct hil_ptr *ptr)
+{
+ struct input_dev *dev = &ptr->dev;
+ hil_packet *data = ptr->data;
+ hil_packet p;
+ int idx, i, cnt, laxis;
+ int ax16, absdev;
+
+ idx = ptr->idx4/4;
+ p = data[idx - 1];
+
+ if ((p & ~HIL_CMDCT_POL) ==
+ (HIL_ERR_INT | HIL_PKT_CMD | HIL_CMD_POL)) goto report;
+ if ((p & ~HIL_CMDCT_RPL) ==
+ (HIL_ERR_INT | HIL_PKT_CMD | HIL_CMD_RPL)) goto report;
+
+ /* Not a poll response. See if we are loading config records. */
+ switch (p & HIL_PKT_DATA_MASK) {
+ case HIL_CMD_IDD:
+ for (i = 0; i < idx; i++)
+ ptr->idd[i] = ptr->data[i] & HIL_PKT_DATA_MASK;
+ for (; i < HIL_PTR_MAX_LENGTH; i++)
+ ptr->idd[i] = 0;
+ break;
+ case HIL_CMD_RSC:
+ for (i = 0; i < idx; i++)
+ ptr->rsc[i] = ptr->data[i] & HIL_PKT_DATA_MASK;
+ for (; i < HIL_PTR_MAX_LENGTH; i++)
+ ptr->rsc[i] = 0;
+ break;
+ case HIL_CMD_EXD:
+ for (i = 0; i < idx; i++)
+ ptr->exd[i] = ptr->data[i] & HIL_PKT_DATA_MASK;
+ for (; i < HIL_PTR_MAX_LENGTH; i++)
+ ptr->exd[i] = 0;
+ break;
+ case HIL_CMD_RNM:
+ for (i = 0; i < idx; i++)
+ ptr->rnm[i] = ptr->data[i] & HIL_PKT_DATA_MASK;
+ for (; i < HIL_PTR_MAX_LENGTH + 1; i++)
+ ptr->rnm[i] = '\0';
+ break;
+ default:
+ /* These occur when device isn't present */
+ if (p == (HIL_ERR_INT | HIL_PKT_CMD)) break;
+ /* Anything else we'd like to know about. */
+ printk(KERN_WARNING PREFIX "Device sent unknown record %x\n", p);
+ break;
+ }
+ goto out;
+
+ report:
+ if ((p & HIL_CMDCT_POL) != idx - 1) {
+ printk(KERN_WARNING PREFIX "Malformed poll packet %x (idx = %i)\n", p, idx);
+ goto out;
+ }
+
+ i = (ptr->data[0] & HIL_POL_AXIS_ALT) ? 3 : 0;
+ laxis = ptr->data[0] & HIL_POL_NUM_AXES_MASK;
+ laxis += i;
+
+ ax16 = ptr->idd[1] & HIL_IDD_HEADER_16BIT; /* 8 or 16bit resolution */
+ absdev = ptr->idd[1] & HIL_IDD_HEADER_ABS;
+
+ for (cnt = 1; i < laxis; i++) {
+ unsigned int lo,hi,val;
+ lo = ptr->data[cnt++] & HIL_PKT_DATA_MASK;
+ hi = ax16 ? (ptr->data[cnt++] & HIL_PKT_DATA_MASK) : 0;
+ if (absdev) {
+ val = lo + (hi<<8);
+#ifdef TABLET_AUTOADJUST
+ if (val < ptr->dev.absmin[ABS_X + i])
+ ptr->dev.absmin[ABS_X + i] = val;
+ if (val > ptr->dev.absmax[ABS_X + i])
+ ptr->dev.absmax[ABS_X + i] = val;
+#endif
+ if (i%3) val = ptr->dev.absmax[ABS_X + i] - val;
+ input_report_abs(dev, ABS_X + i, val);
+ } else {
+ val = (int) (((int8_t)lo) | ((int8_t)hi<<8));
+ if (i%3) val *= -1;
+ input_report_rel(dev, REL_X + i, val);
+ }
+ }
+
+ while (cnt < idx - 1) {
+ unsigned int btn;
+ int up;
+ btn = ptr->data[cnt++];
+ up = btn & 1;
+ btn &= 0xfe;
+ if (btn == 0x8e) {
+ continue; /* TODO: proximity == touch? */
+ }
+ else if ((btn > 0x8c) || (btn < 0x80)) continue;
+ btn = (btn - 0x80) >> 1;
+ btn = ptr->btnmap[btn];
+ input_report_key(dev, btn, !up);
+ }
+ input_sync(dev);
+ out:
+ ptr->idx4 = 0;
+ up(&ptr->sem);
+}
+
+static void hil_ptr_process_err(struct hil_ptr *ptr) {
+ printk(KERN_WARNING PREFIX "errored HIL packet\n");
+ ptr->idx4 = 0;
+ up(&ptr->sem);
+ return;
+}
+
+static irqreturn_t hil_ptr_interrupt(struct serio *serio,
+ unsigned char data, unsigned int flags, struct pt_regs *regs)
+{
+ struct hil_ptr *ptr;
+ hil_packet packet;
+ int idx;
+
+ ptr = (struct hil_ptr *)serio->private;
+ if (ptr == NULL) {
+ BUG();
+ return IRQ_HANDLED;
+ }
+
+ if (ptr->idx4 >= (HIL_PTR_MAX_LENGTH * sizeof(hil_packet))) {
+ hil_ptr_process_err(ptr);
+ return IRQ_HANDLED;
+ }
+ idx = ptr->idx4/4;
+ if (!(ptr->idx4 % 4)) ptr->data[idx] = 0;
+ packet = ptr->data[idx];
+ packet |= ((hil_packet)data) << ((3 - (ptr->idx4 % 4)) * 8);
+ ptr->data[idx] = packet;
+
+ /* Records of N 4-byte hil_packets must terminate with a command. */
+ if ((++(ptr->idx4)) % 4) return IRQ_HANDLED;
+ if ((packet & 0xffff0000) != HIL_ERR_INT) {
+ hil_ptr_process_err(ptr);
+ return IRQ_HANDLED;
+ }
+ if (packet & HIL_PKT_CMD)
+ hil_ptr_process_record(ptr);
+ return IRQ_HANDLED;
+}
+
+static void hil_ptr_disconnect(struct serio *serio)
+{
+ struct hil_ptr *ptr;
+
+ ptr = (struct hil_ptr *)serio->private;
+ if (ptr == NULL) {
+ BUG();
+ return;
+ }
+
+ input_unregister_device(&ptr->dev);
+ serio_close(serio);
+ kfree(ptr);
+}
+
+static void hil_ptr_connect(struct serio *serio, struct serio_driver *driver)
+{
+ struct hil_ptr *ptr;
+ char *txt;
+ unsigned int i, naxsets, btntype;
+ uint8_t did, *idd;
+
+ if (serio->type != (SERIO_HIL_MLC | SERIO_HIL)) return;
+
+ if (!(ptr = kmalloc(sizeof(struct hil_ptr), GFP_KERNEL))) return;
+ memset(ptr, 0, sizeof(struct hil_ptr));
+
+ if (serio_open(serio, driver)) goto bail0;
+
+ serio->private = ptr;
+ ptr->serio = serio;
+ ptr->dev.private = ptr;
+
+ init_MUTEX_LOCKED(&(ptr->sem));
+
+ /* Get device info. MLC driver supplies devid/status/etc. */
+ serio->write(serio, 0);
+ serio->write(serio, 0);
+ serio->write(serio, HIL_PKT_CMD >> 8);
+ serio->write(serio, HIL_CMD_IDD);
+ down(&(ptr->sem));
+
+ serio->write(serio, 0);
+ serio->write(serio, 0);
+ serio->write(serio, HIL_PKT_CMD >> 8);
+ serio->write(serio, HIL_CMD_RSC);
+ down(&(ptr->sem));
+
+ serio->write(serio, 0);
+ serio->write(serio, 0);
+ serio->write(serio, HIL_PKT_CMD >> 8);
+ serio->write(serio, HIL_CMD_RNM);
+ down(&(ptr->sem));
+
+ serio->write(serio, 0);
+ serio->write(serio, 0);
+ serio->write(serio, HIL_PKT_CMD >> 8);
+ serio->write(serio, HIL_CMD_EXD);
+ down(&(ptr->sem));
+
+ up(&(ptr->sem));
+
+ init_input_dev(&ptr->dev);
+ did = ptr->idd[0];
+ idd = ptr->idd + 1;
+ txt = "unknown";
+ if ((did & HIL_IDD_DID_TYPE_MASK) == HIL_IDD_DID_TYPE_REL) {
+ ptr->dev.evbit[0] = BIT(EV_REL);
+ txt = "relative";
+ }
+
+ if ((did & HIL_IDD_DID_TYPE_MASK) == HIL_IDD_DID_TYPE_ABS) {
+ ptr->dev.evbit[0] = BIT(EV_ABS);
+ txt = "absolute";
+ }
+ if (!ptr->dev.evbit[0]) {
+ goto bail1;
+ }
+
+ ptr->nbtn = HIL_IDD_NUM_BUTTONS(idd);
+ if (ptr->nbtn) ptr->dev.evbit[0] |= BIT(EV_KEY);
+
+ naxsets = HIL_IDD_NUM_AXSETS(*idd);
+ ptr->naxes = HIL_IDD_NUM_AXES_PER_SET(*idd);
+
+ printk(KERN_INFO PREFIX "HIL pointer device found (did: 0x%02x, axis: %s)\n",
+ did, txt);
+ printk(KERN_INFO PREFIX "HIL pointer has %i buttons and %i sets of %i axes\n",
+ ptr->nbtn, naxsets, ptr->naxes);
+
+ btntype = BTN_MISC;
+ if ((did & HIL_IDD_DID_ABS_TABLET_MASK) == HIL_IDD_DID_ABS_TABLET)
+#ifdef TABLET_SIMULATES_MOUSE
+ btntype = BTN_TOUCH;
+#else
+ btntype = BTN_DIGI;
+#endif
+ if ((did & HIL_IDD_DID_ABS_TSCREEN_MASK) == HIL_IDD_DID_ABS_TSCREEN)
+ btntype = BTN_TOUCH;
+
+ if ((did & HIL_IDD_DID_REL_MOUSE_MASK) == HIL_IDD_DID_REL_MOUSE)
+ btntype = BTN_MOUSE;
+
+ for (i = 0; i < ptr->nbtn; i++) {
+ set_bit(btntype | i, ptr->dev.keybit);
+ ptr->btnmap[i] = btntype | i;
+ }
+
+ if (btntype == BTN_MOUSE) {
+ /* Swap buttons 2 and 3 */
+ ptr->btnmap[1] = BTN_MIDDLE;
+ ptr->btnmap[2] = BTN_RIGHT;
+ }
+
+ if ((did & HIL_IDD_DID_TYPE_MASK) == HIL_IDD_DID_TYPE_REL) {
+ for (i = 0; i < ptr->naxes; i++) {
+ set_bit(REL_X + i, ptr->dev.relbit);
+ }
+ for (i = 3; (i < ptr->naxes + 3) && (naxsets > 1); i++) {
+ set_bit(REL_X + i, ptr->dev.relbit);
+ }
+ } else {
+ for (i = 0; i < ptr->naxes; i++) {
+ set_bit(ABS_X + i, ptr->dev.absbit);
+ ptr->dev.absmin[ABS_X + i] = 0;
+ ptr->dev.absmax[ABS_X + i] =
+ HIL_IDD_AXIS_MAX((ptr->idd + 1), i);
+ }
+ for (i = 3; (i < ptr->naxes + 3) && (naxsets > 1); i++) {
+ set_bit(ABS_X + i, ptr->dev.absbit);
+ ptr->dev.absmin[ABS_X + i] = 0;
+ ptr->dev.absmax[ABS_X + i] =
+ HIL_IDD_AXIS_MAX((ptr->idd + 1), (i - 3));
+ }
+#ifdef TABLET_AUTOADJUST
+ for (i = 0; i < ABS_MAX; i++) {
+ int diff = ptr->dev.absmax[ABS_X + i] / 10;
+ ptr->dev.absmin[ABS_X + i] += diff;
+ ptr->dev.absmax[ABS_X + i] -= diff;
+ }
+#endif
+ }
+
+ ptr->dev.name = strlen(ptr->rnm) ? ptr->rnm : HIL_GENERIC_NAME;
+
+ ptr->dev.id.bustype = BUS_HIL;
+ ptr->dev.id.vendor = PCI_VENDOR_ID_HP;
+ ptr->dev.id.product = 0x0001; /* TODO: get from ptr->rsc */
+ ptr->dev.id.version = 0x0100; /* TODO: get from ptr->rsc */
+ ptr->dev.dev = &serio->dev;
+
+ input_register_device(&ptr->dev);
+ printk(KERN_INFO "input: %s (%s), ID: %d\n",
+ ptr->dev.name,
+ (btntype == BTN_MOUSE) ? "HIL mouse":"HIL tablet or touchpad",
+ did);
+
+ return;
+ bail1:
+ serio_close(serio);
+ bail0:
+ kfree(ptr);
+ return;
+}
+
+
+static struct serio_driver hil_ptr_serio_driver = {
+ .driver = {
+ .name = "hil_ptr",
+ },
+ .description = "HP HIL mouse/tablet driver",
+ .connect = hil_ptr_connect,
+ .disconnect = hil_ptr_disconnect,
+ .interrupt = hil_ptr_interrupt
+};
+
+static int __init hil_ptr_init(void)
+{
+ serio_register_driver(&hil_ptr_serio_driver);
+ return 0;
+}
+
+static void __exit hil_ptr_exit(void)
+{
+ serio_unregister_driver(&hil_ptr_serio_driver);
+}
+
+module_init(hil_ptr_init);
+module_exit(hil_ptr_exit);
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