openwrtv3/target/linux/olpc/files-2.6.23/drivers/input/mouse/olpc.c

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/*
* OLPC touchpad PS/2 mouse driver
*
* Copyright (c) 2006 One Laptop Per Child, inc.
* Authors Zephaniah E. Hull and Andres Salomon <dilinger@laptop.org>
*
* This driver is partly based on the ALPS driver, which is:
*
* Copyright (c) 2003 Neil Brown <neilb@cse.unsw.edu.au>
* Copyright (c) 2003-2005 Peter Osterlund <petero2@telia.com>
* Copyright (c) 2004 Dmitry Torokhov <dtor@mail.ru>
* Copyright (c) 2005 Vojtech Pavlik <vojtech@suse.cz>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
/*
* The touchpad on the OLPC is fairly wide, with the entire area usable
* as a tablet ("PT mode"), and the center 1/3rd also usable as a touchpad
* ("GS mode").
*
* Earlier version of the device had simultaneous reporting; however, that
* was removed. Instead, the device now reports packets in one mode, and
* tells the driver when a mode switch needs to happen.
*/
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/libps2.h>
#include <linux/delay.h>
#include <asm/olpc.h>
#include "psmouse.h"
#include "olpc.h"
static int tpdebug;
module_param(tpdebug, int, 0644);
#define OLPC_GS 1 /* The GS sensor. */
#define OLPC_PT 2 /* The PT sensor. */
static struct olpc_model_info olpc_model_data[] = {
{ { 0x67, 0x00, 0x00 }, OLPC_GS | OLPC_PT }, /* unknown ID */
{ { 0x67, 0x00, 0x0a }, OLPC_GS | OLPC_PT }, /* pre-B1 */
{ { 0x67, 0x00, 0x14 }, OLPC_GS }, /* B1.*/
{ { 0x67, 0x00, 0x28 }, OLPC_GS | OLPC_PT }, /* B2 */
{ { 0x67, 0x00, 0x3c }, OLPC_GS | OLPC_PT }, /* B2-2 */
{ { 0x67, 0x00, 0x50 }, OLPC_GS | OLPC_PT }, /* C1 */
};
#define OLPC_PKT_PT 0xcf
#define OLPC_PKT_GS 0xff
static int olpc_absolute_mode(struct psmouse *psmouse, int mode);
/*
* OLPC absolute Mode - single-mode format
*
* byte 0: 1 1 0 0 1 1 1 1
* byte 1: 0 x6 x5 x4 x3 x2 x1 x0
* byte 2(PT): 0 0 x9 x8 x7 ? pt-dsw gs-dsw
* byte 2(GS): 0 x10 x9 x8 x7 ? gs-dsw pt-dsw
* byte 3: 0 y9 y8 y7 1 0 swr swl
* byte 4: 0 y6 y5 y4 y3 y2 y1 y0
* byte 5: 0 z6 z5 z4 z3 z2 z1 z0
*
* ?'s are not defined in the protocol spec, may vary between models.
*
* swr/swl are the left/right buttons.
*
* pt-dsw/gs-dsw indicate that the pt/gs sensor is detecting a
* pen/finger
*/
static void olpc_process_packet_gspt(struct psmouse *psmouse)
{
struct olpc_data *priv = psmouse->private;
unsigned char *packet = psmouse->packet;
struct input_dev *dev = psmouse->dev;
struct input_dev *dev2 = priv->dev2;
int x, y, z, gs_down = 0, pt_down = 0, left, right;
struct timeval now_tv;
s64 now_ns;
left = packet[3] & 1;
right = packet[3] & 2;
x = packet[1] | ((packet[2] & 0x78) << 4);
y = packet[4] | ((packet[3] & 0x70) << 3);
z = packet[5];
if (psmouse->packet[0] == OLPC_PKT_GS) {
pt_down = !!(packet[2] & 1);
gs_down = !!(packet[2] & 2);
} else if (psmouse->packet[0] == OLPC_PKT_PT) {
gs_down = !!(packet[2] & 1);
pt_down = !!(packet[2] & 2);
}
/*
* XXX: Kludge.
* If it's been more than 30ms since the last packet,
* assume that there was a lift we were never told about.
*/
do_gettimeofday(&now_tv);
now_ns = timeval_to_ns (&now_tv);
if (now_ns >= priv->late) {
input_report_key(dev, BTN_TOUCH, 0);
input_report_key(dev, BTN_TOOL_PEN, 0);
input_report_key(dev2, BTN_TOUCH, 0);
input_report_key(dev2, BTN_TOOL_FINGER, 0);
input_sync(dev);
input_sync(dev2);
}
priv->late = now_ns + (30 * NSEC_PER_MSEC);
if (tpdebug) {
printk(KERN_DEBUG "%s %02x %02x %02x %02x %02x %02x\n",
__FUNCTION__, psmouse->packet[0], psmouse->packet[1],
psmouse->packet[2], psmouse->packet[3], psmouse->packet[4],
psmouse->packet[5]);
printk(KERN_DEBUG "l=%d r=%d p=%d g=%d x=%d y=%d z=%d\n",
left, right, pt_down, gs_down, x, y, z);
}
if (psmouse->packet[0] == OLPC_PKT_PT) {
input_report_key(dev, BTN_LEFT, left);
input_report_key(dev, BTN_RIGHT, right);
} else if (psmouse->packet[0] == OLPC_PKT_GS) {
input_report_key(dev, BTN_LEFT, left);
input_report_key(dev, BTN_RIGHT, right);
input_report_key(dev2, BTN_LEFT, left);
input_report_key(dev2, BTN_RIGHT, right);
}
input_report_key(dev, BTN_TOUCH, pt_down);
input_report_key(dev, BTN_TOOL_PEN, pt_down);
input_report_key(dev2, BTN_TOUCH, gs_down);
input_report_key(dev2, BTN_TOOL_FINGER, gs_down);
input_report_abs(dev2, ABS_PRESSURE, z);
if (psmouse->packet[0] == OLPC_PKT_PT && pt_down) {
input_report_abs(dev, ABS_X, x);
input_report_abs(dev, ABS_Y, y);
} else if (psmouse->packet[0] == OLPC_PKT_GS && gs_down) {
input_report_abs(dev2, ABS_X, x);
input_report_abs(dev2, ABS_Y, y);
}
input_sync(dev);
input_sync(dev2);
if (priv->pending_mode == OLPC_GS &&
psmouse->packet[0] == OLPC_PKT_PT && pt_down) {
priv->pending_mode = 0;
cancel_delayed_work(&priv->mode_switch);
}
if (priv->i->flags & (OLPC_PT|OLPC_GS)) {
int pending = 0;
if (psmouse->packet[0] == OLPC_PKT_PT && !pt_down)
pending = OLPC_GS;
else if (psmouse->packet[0] == OLPC_PKT_GS && pt_down)
pending = OLPC_PT;
if (priv->current_mode == pending) {
priv->pending_mode = 0;
pending = priv->current_mode;
}
else if (priv->pending_mode != pending) {
priv->pending_mode = pending;
if (tpdebug)
printk(KERN_WARNING "Scheduling mode switch to %s.\n",
pending == OLPC_GS ? "GS" : "PT");
/*
* Apply a de-bounce when switching from PT to GS, to allow for
* spurious PT-up packets.
*/
if (priv->pending_mode == OLPC_GS)
queue_delayed_work(kpsmoused_wq, &priv->mode_switch, msecs_to_jiffies(50));
else
queue_delayed_work(kpsmoused_wq, &priv->mode_switch, 0);
}
}
}
static psmouse_ret_t olpc_process_byte(struct psmouse *psmouse)
{
psmouse_ret_t ret = PSMOUSE_BAD_DATA;
if (psmouse->packet[0] != OLPC_PKT_PT &&
psmouse->packet[0] != OLPC_PKT_GS)
goto out;
/* Bytes 2 - 6 should have 0 in the highest bit */
if (psmouse->pktcnt >= 2 && psmouse->pktcnt <= 6 &&
(psmouse->packet[psmouse->pktcnt - 1] & 0x80))
goto out;
if (psmouse->pktcnt == 6) {
olpc_process_packet_gspt(psmouse);
ret = PSMOUSE_FULL_PACKET;
goto out;
}
ret = PSMOUSE_GOOD_DATA;
out:
if (ret != PSMOUSE_GOOD_DATA && ret != PSMOUSE_FULL_PACKET)
printk(KERN_DEBUG "%s: (%d) %02x %02x %02x %02x %02x %02x\n",
__FUNCTION__, psmouse->pktcnt, psmouse->packet[0],
psmouse->packet[1], psmouse->packet[2],
psmouse->packet[3], psmouse->packet[4],
psmouse->packet[5]);
return ret;
}
static struct olpc_model_info *olpc_get_model(struct psmouse *psmouse)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
unsigned char param[4];
int i;
/*
* Now try "E7 report". Allowed responses are in
* olpc_model_data[].signature
*/
if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE21) ||
ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE21) ||
ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE21))
return NULL;
param[0] = param[1] = param[2] = 0xff;
if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
return NULL;
pr_debug("olpc.c(%d): E7 report: %2.2x %2.2x %2.2x",
__LINE__, param[0], param[1], param[2]);
for (i = 0; i < ARRAY_SIZE(olpc_model_data); i++) {
if (!memcmp(param, olpc_model_data[i].signature,
sizeof(olpc_model_data[i].signature))) {
printk(KERN_INFO __FILE__ ": OLPC touchpad revision 0x%x.\n", param[2]);
return olpc_model_data + i;
}
}
/*
* ALPS creates new IDs pretty frequently; rather than listing them
* all, just assume they support the defaults. We've set aside the
* first entry of olpc_model_data as the catch-all.
*/
if (!memcmp(param, olpc_model_data[0].signature, 2)) {
printk(KERN_INFO __FILE__ ": unknown ALPS revision %x, assuming default flags.\n", param[2]);
return &olpc_model_data[0];
}
return NULL;
}
static int olpc_find_mode(struct psmouse *psmouse)
{
struct olpc_data *priv = psmouse->private;
int mode = priv->i->flags;
if (mode & OLPC_GS)
mode = OLPC_GS;
else if (mode & OLPC_PT)
mode = OLPC_PT;
else
mode = -1;
return mode;
}
/*
* Touchpad should be disabled before calling this!
*/
static int olpc_new_mode(struct psmouse *psmouse, int mode)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
struct olpc_data *priv = psmouse->private;
unsigned char param;
int ret;
if (tpdebug)
printk(KERN_WARNING __FILE__ ": Switching to %d. [%lu]\n", mode, jiffies);
if ((ret = ps2_command(ps2dev, &param, 0x01F2)))
goto failed;
if ((ret = ps2_command(ps2dev, &param, 0x01F2)))
goto failed;
if ((ret = ps2_command(ps2dev, &param, 0x01F2)))
goto failed;
switch (mode) {
default:
printk(KERN_WARNING __FILE__ ": Invalid mode %d. Defaulting to OLPC_GS.\n", mode);
case OLPC_GS:
ret = ps2_command(ps2dev, NULL, 0xE6);
break;
case OLPC_PT:
ret = ps2_command(ps2dev, NULL, 0xE7);
break;
}
if (ret)
goto failed;
/* XXX: This is a bit hacky, make sure this isn't screwing stuff up. */
psmouse->pktcnt = psmouse->out_of_sync = 0;
psmouse->last = jiffies;
psmouse->state = PSMOUSE_ACTIVATED;
if ((ret = ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE)))
goto failed;
priv->current_mode = mode;
priv->pending_mode = 0;
if (tpdebug)
printk(KERN_WARNING __FILE__ ": Switched to mode %d successful.\n", mode);
failed:
if (ret)
printk(KERN_WARNING __FILE__ ": Mode switch to %d failed! (%d) [%lu]\n", mode, ret, jiffies);
return ret;
}
static int olpc_absolute_mode(struct psmouse *psmouse, int mode)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
/* Switch to 'Advanced mode.', four disables in a row. */
if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE))
return -1;
return olpc_new_mode(psmouse, mode);
}
/*
* olpc_poll() - poll the touchpad for current motion packet.
* Used in resync.
* Note: We can't poll, so always return failure.
*/
static int olpc_poll(struct psmouse *psmouse)
{
return -1;
}
static int olpc_reconnect(struct psmouse *psmouse)
{
struct olpc_data *priv = psmouse->private;
int mode;
if (olpc_rev_after(OLPC_REV_B2))
if (psmouse->ps2dev.serio->dev.power.power_state.event != PM_EVENT_ON)
return 0;
psmouse_reset(psmouse);
if (!(priv->i = olpc_get_model(psmouse)))
return -1;
mode = olpc_find_mode(psmouse);
if (mode < 0)
return -1;
if (olpc_absolute_mode(psmouse, mode)) {
printk(KERN_ERR __FILE__ ": Failed to reenable absolute mode.\n");
return -1;
}
return 0;
}
static void olpc_disconnect(struct psmouse *psmouse)
{
struct olpc_data *priv = psmouse->private;
psmouse_reset(psmouse);
input_unregister_device(priv->dev2);
kfree(priv);
}
static void olpc_mode_switch(struct work_struct *w)
{
struct delayed_work *work = container_of(w, struct delayed_work, work);
struct olpc_data *priv = container_of(work, struct olpc_data, mode_switch);
struct psmouse *psmouse = priv->psmouse;
struct ps2dev *ps2dev = &psmouse->ps2dev;
int pending_mode, ret;
if (priv->pending_mode == priv->current_mode) {
priv->pending_mode = 0;
printk (KERN_DEBUG __FILE__ ": In switch_mode, no target mode.\n");
return;
}
if (tpdebug)
printk(KERN_WARNING __FILE__ ": Disable for switch to %d. [%lu]\n", priv->pending_mode, jiffies);
/* XXX: This is a bit hacky, make sure this isn't screwing stuff up. */
psmouse->state = PSMOUSE_INITIALIZING;
ret = ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE);
if (ret) {
/* XXX: if this ever fails, we need to do a full reset! */
printk(KERN_WARNING __FILE__ ": Disable failed for switch to %d. (%d) [%lu]\n", priv->pending_mode, ret, jiffies);
return;
}
/*
* ALPS tells us that it may take up to 20msec for the disable to
* take effect; however, ps2_command() will wait up to 200msec for
* the ACK to come back (and I'm assuming that by the time the
* hardware sends back its ACK, it has stopped sending bytes).
*/
pending_mode = priv->pending_mode;
if (olpc_new_mode(psmouse, priv->pending_mode))
goto bad;
/*
* Deal with a potential race condition.
*
* If there is a brief tap of a stylus or a fingernail that
* triggers a mode switch to PT mode, and the stylus/fingernail is
* lifted after the DISABLE above, but before we reenable in the new mode,
* then we can get stuck in PT mode.
*/
if (pending_mode == OLPC_PT) {
priv->pending_mode = OLPC_GS;
queue_delayed_work(kpsmoused_wq, &priv->mode_switch, msecs_to_jiffies(50));
}
return;
bad:
printk(KERN_WARNING __FILE__ ": Failure to switch modes, resetting device...\n");
olpc_reconnect(psmouse);
}
int olpc_init(struct psmouse *psmouse)
{
struct olpc_data *priv;
struct input_dev *dev = psmouse->dev;
struct input_dev *dev2;
int mode;
priv = kzalloc(sizeof(struct olpc_data), GFP_KERNEL);
dev2 = input_allocate_device();
if (!priv || !dev2)
goto init_fail;
psmouse->private = priv;
priv->dev2 = dev2;
priv->psmouse = psmouse;
psmouse_reset(psmouse);
if (!(priv->i = olpc_get_model(psmouse)))
goto init_fail;
mode = olpc_find_mode(psmouse);
if (mode < 0) {
printk(KERN_ERR __FILE__ ": Failed to identify proper mode\n");
goto init_fail;
}
if (olpc_absolute_mode(psmouse, mode)) {
printk(KERN_ERR __FILE__ ": Failed to enable absolute mode\n");
goto init_fail;
}
/*
* Unset some of the default bits for things we don't have.
*/
dev->evbit[LONG(EV_REL)] &= ~BIT(EV_REL);
dev->relbit[LONG(REL_X)] &= ~(BIT(REL_X) | BIT(REL_Y));
dev->keybit[LONG(BTN_MIDDLE)] &= ~BIT(BTN_MIDDLE);
dev->evbit[LONG(EV_KEY)] |= BIT(EV_KEY);
dev->keybit[LONG(BTN_TOUCH)] |= BIT(BTN_TOUCH);
dev->keybit[LONG(BTN_TOOL_PEN)] |= BIT(BTN_TOOL_PEN);
dev->keybit[LONG(BTN_LEFT)] |= BIT(BTN_LEFT) | BIT(BTN_RIGHT);
dev->evbit[LONG(EV_ABS)] |= BIT(EV_ABS);
input_set_abs_params(dev, ABS_X, 2, 1000, 0, 0);
input_set_abs_params(dev, ABS_Y, 0, 717, 0, 0);
snprintf(priv->phys, sizeof(priv->phys),
"%s/input1", psmouse->ps2dev.serio->phys);
dev2->phys = priv->phys;
dev2->name = "OLPC ALPS GlideSensor";
dev2->id.bustype = BUS_I8042;
dev2->id.vendor = 0x0002;
dev2->id.product = PSMOUSE_OLPC;
dev2->id.version = 0x0000;
dev2->evbit[LONG(EV_KEY)] |= BIT(EV_KEY);
dev2->keybit[LONG(BTN_TOUCH)] |= BIT(BTN_TOUCH);
dev2->keybit[LONG(BTN_TOOL_FINGER)] |= BIT(BTN_TOOL_FINGER);
dev2->keybit[LONG(BTN_LEFT)] |= BIT(BTN_LEFT) | BIT(BTN_RIGHT);
dev2->evbit[LONG(EV_ABS)] |= BIT(EV_ABS);
input_set_abs_params(dev2, ABS_X, 350, 512, 0, 0);
input_set_abs_params(dev2, ABS_Y, 70, 325, 0, 0);
input_set_abs_params(dev2, ABS_PRESSURE, 0, 63, 0, 0);
if (input_register_device(dev2)) {
printk(KERN_ERR __FILE__ ": Failed to register GlideSensor\n");
goto init_fail;
}
psmouse->protocol_handler = olpc_process_byte;
psmouse->poll = olpc_poll;
psmouse->disconnect = olpc_disconnect;
psmouse->reconnect = olpc_reconnect;
psmouse->pktsize = 6;
/* Disable the idle resync. */
psmouse->resync_time = 0;
/* Reset after a lot of bad bytes. */
psmouse->resetafter = 1024;
INIT_DELAYED_WORK(&priv->mode_switch, olpc_mode_switch);
return 0;
init_fail:
input_free_device(dev2);
kfree(priv);
return -1;
}
int olpc_detect(struct psmouse *psmouse, int set_properties)
{
if (!olpc_get_model(psmouse))
return -1;
if (set_properties) {
psmouse->vendor = "ALPS";
psmouse->name = "PenTablet";
psmouse->model = 0;
}
return 0;
}