/* $NetBSD: elantech.c,v 1.6 2014/02/25 18:30:10 pooka Exp $ */

/*-
* Copyright (c) 2008 Jared D. McNeill <[email protected]>
* 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.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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 OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#include "opt_pms.h"

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: elantech.c,v 1.6 2014/02/25 18:30:10 pooka Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/bus.h>

#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wsmousevar.h>

#include <dev/pckbport/pckbportvar.h>
#include <dev/pckbport/elantechreg.h>
#include <dev/pckbport/elantechvar.h>
#include <dev/pckbport/pmsreg.h>
#include <dev/pckbport/pmsvar.h>

/* #define ELANTECH_DEBUG */

static int elantech_xy_unprecision_nodenum;
static int elantech_z_unprecision_nodenum;

static int elantech_xy_unprecision = 2;
static int elantech_z_unprecision = 3;

struct elantech_packet {
       int16_t         ep_x, ep_y, ep_z;
       int8_t          ep_buttons;
       uint8_t         ep_nfingers;
};

static int
pms_sysctl_elantech_verify(SYSCTLFN_ARGS)
{
       int error, t;
       struct sysctlnode node;

       node = *rnode;
       t = *(int *)rnode->sysctl_data;
       node.sysctl_data = &t;
       error = sysctl_lookup(SYSCTLFN_CALL(&node));
       if (error || newp == NULL)
               return error;

       if (node.sysctl_num == elantech_xy_unprecision_nodenum ||
           node.sysctl_num == elantech_z_unprecision_nodenum) {
               if (t < 0 || t > 7)
                       return EINVAL;
       } else
               return EINVAL;

       *(int *)rnode->sysctl_data = t;

       return 0;
}

static void
pms_sysctl_elantech(struct sysctllog **clog)
{
       const struct sysctlnode *node;
       int rc, root_num;

       if ((rc = sysctl_createv(clog, 0, NULL, &node,
           CTLFLAG_PERMANENT, CTLTYPE_NODE, "elantech",
           SYSCTL_DESCR("Elantech touchpad controls"),
           NULL, 0, NULL, 0, CTL_HW, CTL_CREATE, CTL_EOL)) != 0)
               goto err;

       root_num = node->sysctl_num;

       if ((rc = sysctl_createv(clog, 0, NULL, &node,
           CTLFLAG_PERMANENT | CTLFLAG_READWRITE,
           CTLTYPE_INT, "xy_precision_shift",
           SYSCTL_DESCR("X/Y-axis precision shift value"),
           pms_sysctl_elantech_verify, 0,
           &elantech_xy_unprecision,
           0, CTL_HW, root_num, CTL_CREATE,
           CTL_EOL)) != 0)
               goto err;

       elantech_xy_unprecision_nodenum = node->sysctl_num;

       if ((rc = sysctl_createv(clog, 0, NULL, &node,
           CTLFLAG_PERMANENT | CTLFLAG_READWRITE,
           CTLTYPE_INT, "z_precision_shift",
           SYSCTL_DESCR("Z-axis precision shift value"),
           pms_sysctl_elantech_verify, 0,
           &elantech_z_unprecision,
           0, CTL_HW, root_num, CTL_CREATE,
           CTL_EOL)) != 0)
               goto err;

       elantech_z_unprecision_nodenum = node->sysctl_num;
       return;

err:
       aprint_error("%s: sysctl_createv failed (rc = %d)\n", __func__, rc);
}

static int
pms_elantech_read_1(pckbport_tag_t tag, pckbport_slot_t slot, uint8_t reg,
   uint8_t *val)
{
       int res;
       uint8_t cmd;
       uint8_t resp[3];

       cmd = ELANTECH_CUSTOM_CMD;
       res = pckbport_poll_cmd(tag, slot, &cmd, 1, 0, NULL, 0);
       cmd = ELANTECH_REG_READ;
       res |= pckbport_poll_cmd(tag, slot, &cmd, 1, 0, NULL, 0);
       cmd = ELANTECH_CUSTOM_CMD;
       res |= pckbport_poll_cmd(tag, slot, &cmd, 1, 0, NULL, 0);
       cmd = reg;
       res |= pckbport_poll_cmd(tag, slot, &cmd, 1, 0, NULL, 0);
       cmd = PMS_SEND_DEV_STATUS;
       res |= pckbport_poll_cmd(tag, slot, &cmd, 1, 3, resp, 0);

       if (res == 0)
               *val = resp[0];

       return res;
}

static int
pms_elantech_write_1(pckbport_tag_t tag, pckbport_slot_t slot, uint8_t reg,
   uint8_t val)
{
       int res;
       uint8_t cmd;

       cmd = ELANTECH_CUSTOM_CMD;
       res = pckbport_poll_cmd(tag, slot, &cmd, 1, 0, NULL, 0);
       cmd = ELANTECH_REG_WRITE;
       res |= pckbport_poll_cmd(tag, slot, &cmd, 1, 0, NULL, 0);
       cmd = ELANTECH_CUSTOM_CMD;
       res |= pckbport_poll_cmd(tag, slot, &cmd, 1, 0, NULL, 0);
       cmd = reg;
       res |= pckbport_poll_cmd(tag, slot, &cmd, 1, 0, NULL, 0);
       cmd = ELANTECH_CUSTOM_CMD;
       res |= pckbport_poll_cmd(tag, slot, &cmd, 1, 0, NULL, 0);
       cmd = val;
       res |= pckbport_poll_cmd(tag, slot, &cmd, 1, 0, NULL, 0);
       cmd = PMS_SET_SCALE11;
       res |= pckbport_poll_cmd(tag, slot, &cmd, 1, 0, NULL, 0);

       return res;
}

static int
pms_elantech_init(struct pms_softc *psc)
{
       uint8_t val;
       int res;

       /* set absolute mode */
       res = pms_elantech_write_1(psc->sc_kbctag, psc->sc_kbcslot, 0x10, 0x54);
       if (res)
               return res;
       res = pms_elantech_write_1(psc->sc_kbctag, psc->sc_kbcslot, 0x11, 0x88);
       if (res)
               return res;
       res = pms_elantech_write_1(psc->sc_kbctag, psc->sc_kbcslot, 0x21, 0x60);
       if (res)
               return res;

       res = pms_elantech_read_1(psc->sc_kbctag, psc->sc_kbcslot, 0x10, &val);

       if (res)
               aprint_error_dev(psc->sc_dev, "couldn't set absolute mode\n");

       return res;
}

static void
pms_elantech_input(void *opaque, int data)
{
       struct pms_softc *psc = opaque;
       struct elantech_softc *sc = &psc->u.elantech;
       struct elantech_packet ep;
       int s;

       if (!psc->sc_enabled)
               return;

       if (sc->version >= 0x020800) {
               if ((psc->inputstate == 0 && (data & 0x0c) != 0x04) ||
                   (psc->inputstate == 3 && (data & 0x0f) != 0x02)) {
                       aprint_debug_dev(psc->sc_dev, "waiting for sync..\n");
                       psc->inputstate = 0;
                       return;
               }
       } else {
               if ((psc->inputstate == 0 && (data & 0x0c) != 0x0c) ||
                   (psc->inputstate == 3 && (data & 0x0e) != 0x08)) {
                       aprint_debug_dev(psc->sc_dev, "waiting for sync..\n");
                       psc->inputstate = 0;
                       return;
               }
       }

       psc->packet[psc->inputstate++] = data & 0xff;
       if (psc->inputstate != 6)
               return;

       psc->inputstate = 0;

       ep.ep_nfingers = (psc->packet[0] & 0xc0) >> 6;
       ep.ep_buttons = 0;
       ep.ep_buttons = psc->packet[0] & 1;             /* left button */
       ep.ep_buttons |= (psc->packet[0] & 2) << 1;     /* right button */

       if (ep.ep_nfingers == 0 || ep.ep_nfingers != sc->last_nfingers)
               sc->initializing = true;

       switch (ep.ep_nfingers) {
       case 0:
               /* FALLTHROUGH */
       case 1:
               ep.ep_x = ((int16_t)(psc->packet[1] & 0xf) << 8) | psc->packet[2];
               ep.ep_y = ((int16_t)(psc->packet[4] & 0xf) << 8) | psc->packet[5];

               aprint_debug_dev(psc->sc_dev,
                   "%d finger detected in elantech mode:\n", ep.ep_nfingers);
               aprint_debug_dev(psc->sc_dev,
                   "  X=%d Y=%d\n", ep.ep_x, ep.ep_y);
               aprint_debug_dev(psc->sc_dev,
                   "  %02x %02x %02x %02x %02x %02x\n",
                   psc->packet[0], psc->packet[1], psc->packet[2],
                   psc->packet[3], psc->packet[4], psc->packet[5]);

               s = spltty();
               wsmouse_input(psc->sc_wsmousedev, ep.ep_buttons,
                   sc->initializing ?
                     0 : (ep.ep_x - sc->last_x) >> elantech_xy_unprecision,
                   sc->initializing ?
                     0 : (ep.ep_y - sc->last_y) >> elantech_xy_unprecision,
                   0, 0,
                   WSMOUSE_INPUT_DELTA);
               splx(s);

               if (sc->initializing == true ||
                   ((ep.ep_x - sc->last_x) >> elantech_xy_unprecision) != 0)
                       sc->last_x = ep.ep_x;
               if (sc->initializing == true ||
                   ((ep.ep_y - sc->last_y) >> elantech_xy_unprecision) != 0)
                       sc->last_y = ep.ep_y;
               break;
       case 2:
               /* emulate z axis */
               ep.ep_z = psc->packet[2];
               aprint_debug_dev(psc->sc_dev,
                   "2 fingers detected in elantech mode:\n");
               aprint_debug_dev(psc->sc_dev,
                   "  %02x %02x %02x %02x %02x %02x\n",
                   psc->packet[0], psc->packet[1], psc->packet[2],
                   psc->packet[3], psc->packet[4], psc->packet[5]);

               s = spltty();
               wsmouse_input(psc->sc_wsmousedev, 0,
                   0, 0,
                   sc->initializing ?
                     0 : (sc->last_z - ep.ep_z) >> elantech_z_unprecision,
                   0,
                   WSMOUSE_INPUT_DELTA);
               splx(s);

               if (sc->initializing == true ||
                   ((sc->last_z - ep.ep_z) >> elantech_z_unprecision) != 0)
                       sc->last_z = ep.ep_z;
               break;
       default:
               aprint_debug_dev(psc->sc_dev, "that's a lot of fingers!\n");
               return;
       }

       if (ep.ep_nfingers > 0)
               sc->initializing = false;
       sc->last_nfingers = ep.ep_nfingers;
}

int
pms_elantech_probe_init(void *opaque)
{
       struct pms_softc *psc = opaque;
       struct elantech_softc *sc = &psc->u.elantech;
       struct sysctllog *clog = NULL;
       u_char cmd[1], resp[3];
       uint16_t fwversion;
       int res;

       pckbport_flush(psc->sc_kbctag, psc->sc_kbcslot);

       cmd[0] = PMS_SET_SCALE11;
       if ((res = pckbport_poll_cmd(psc->sc_kbctag, psc->sc_kbcslot,
           cmd, 1, 0, NULL, 0)) != 0)
               goto doreset;
       cmd[0] = PMS_SET_SCALE11;
       if ((res = pckbport_poll_cmd(psc->sc_kbctag, psc->sc_kbcslot,
           cmd, 1, 0, NULL, 0)) != 0)
               goto doreset;
       cmd[0] = PMS_SET_SCALE11;
       if ((res = pckbport_poll_cmd(psc->sc_kbctag, psc->sc_kbcslot,
           cmd, 1, 0, NULL, 0)) != 0)
               goto doreset;

       cmd[0] = PMS_SEND_DEV_STATUS;
       if ((res = pckbport_poll_cmd(psc->sc_kbctag, psc->sc_kbcslot,
           cmd, 1, 3, resp, 0)) != 0)
               goto doreset;

       if (!ELANTECH_MAGIC(resp)) {
#ifdef ELANTECH_DEBUG
               aprint_error_dev(psc->sc_dev,
                   "bad elantech magic (%X %X %X)\n",
                   resp[0], resp[1], resp[2]);
#endif
               res = 1;
               goto doreset;
       }

       res = pms_sliced_command(psc->sc_kbctag, psc->sc_kbcslot,
           ELANTECH_FW_VERSION);
       cmd[0] = PMS_SEND_DEV_STATUS;
       res |= pckbport_poll_cmd(psc->sc_kbctag, psc->sc_kbcslot,
           cmd, 1, 3, resp, 0);
       if (res) {
               aprint_error_dev(psc->sc_dev,
                   "unable to query elantech firmware version\n");
               goto doreset;
       }

       fwversion = (resp[0] << 8) | resp[2];
       if (fwversion < ELANTECH_MIN_VERSION) {
               aprint_error_dev(psc->sc_dev,
                   "unsupported Elantech version %d.%d (%X %X %X)\n",
                   resp[0], resp[2], resp[0], resp[1], resp[2]);
               goto doreset;
       }
       sc->version = (resp[0] << 16) | (resp[1] << 8) | resp[2];
       aprint_normal_dev(psc->sc_dev, "Elantech touchpad version %d.%d (%06x)\n",
           resp[0], resp[2], sc->version);

       res = pms_elantech_init(psc);
       if (res) {
               aprint_error_dev(psc->sc_dev,
                   "couldn't initialize elantech touchpad\n");
               goto doreset;
       }

       pms_sysctl_elantech(&clog);
       pckbport_set_inputhandler(psc->sc_kbctag, psc->sc_kbcslot,
           pms_elantech_input, psc, device_xname(psc->sc_dev));

       return 0;

doreset:
       cmd[0] = PMS_RESET;
       (void)pckbport_poll_cmd(psc->sc_kbctag, psc->sc_kbcslot, cmd,
           1, 2, resp, 1);
       return res;
}

void
pms_elantech_enable(void *opaque)
{
       struct pms_softc *psc = opaque;
       struct elantech_softc *sc = &psc->u.elantech;

       sc->initializing = true;
}

void
pms_elantech_resume(void *opaque)
{
       struct pms_softc *psc = opaque;
       uint8_t cmd, resp[2];
       int res;

       cmd = PMS_RESET;
       res = pckbport_poll_cmd(psc->sc_kbctag, psc->sc_kbcslot, &cmd,
           1, 2, resp, 1);
       if (res)
               aprint_error_dev(psc->sc_dev,
                   "elantech reset on resume failed\n");
       else {
               pms_elantech_init(psc);
               pms_elantech_enable(psc);
       }
}

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