// SPDX-License-Identifier: GPL-2.0-only
/*
* OLPC HGPK (XO-1) touchpad PS/2 mouse driver
*
* Copyright (c) 2006-2008 One Laptop Per Child
* Authors:
* Zephaniah E. Hull
* Andres Salomon <dilinger@debian.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>
*/
/*
* The spec from ALPS is available from
* <http://wiki.laptop.org/go/Touch_Pad/Tablet>. It refers to this
* device as HGPK (Hybrid GS, PT, and Keymatrix).
*
* The earliest versions of the device had simultaneous reporting; that
* was removed. After that, the device used the Advanced Mode GS/PT streaming
* stuff. That turned out to be too buggy to support, so we've finally
* switched to Mouse Mode (which utilizes only the center 1/3 of the touchpad).
*/
#define DEBUG
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/serio.h>
#include <linux/libps2.h>
#include <linux/delay.h>
#include <asm/olpc.h>
#include "psmouse.h"
#include "hgpk.h"
#define ILLEGAL_XY 999999
static bool tpdebug;
module_param(tpdebug, bool, 0644);
MODULE_PARM_DESC(tpdebug, "enable debugging, dumping packets to KERN_DEBUG.");
static int recalib_delta = 100;
module_param(recalib_delta, int, 0644);
MODULE_PARM_DESC(recalib_delta,
"packets containing a delta this large will be discarded, and a "
"recalibration may be scheduled.");
static int jumpy_delay = 20;
module_param(jumpy_delay, int, 0644);
MODULE_PARM_DESC(jumpy_delay,
"delay (ms) before recal after jumpiness detected");
static int spew_delay = 1;
module_param(spew_delay, int, 0644);
MODULE_PARM_DESC(spew_delay,
"delay (ms) before recal after packet spew detected");
static int recal_guard_time;
module_param(recal_guard_time, int, 0644);
MODULE_PARM_DESC(recal_guard_time,
"interval (ms) during which recal will be restarted if packet received");
static int post_interrupt_delay = 40;
module_param(post_interrupt_delay, int, 0644);
MODULE_PARM_DESC(post_interrupt_delay,
"delay (ms) before recal after recal interrupt detected");
static bool autorecal = true;
module_param(autorecal, bool, 0644);
MODULE_PARM_DESC(autorecal, "enable recalibration in the driver");
static char hgpk_mode_name[16];
module_param_string(hgpk_mode, hgpk_mode_name, sizeof(hgpk_mode_name), 0644);
MODULE_PARM_DESC(hgpk_mode,
"default hgpk mode: mouse, glidesensor or pentablet");
static int hgpk_default_mode = HGPK_MODE_MOUSE;
static const char * const hgpk_mode_names[] = {
[HGPK_MODE_MOUSE] = "Mouse",
[HGPK_MODE_GLIDESENSOR] = "GlideSensor",
[HGPK_MODE_PENTABLET] = "PenTablet",
};
static int hgpk_mode_from_name(const char *buf, int len)
{
int i;
for (i = 0; i < ARRAY_SIZE(hgpk_mode_names); i++) {
const char *name = hgpk_mode_names[i];
if (strlen(name) == len && !strncasecmp(name, buf, len))
return i;
}
return HGPK_MODE_INVALID;
}
/*
* see if new value is within 20% of half of old value
*/
static int approx_half(int curr, int prev)
{
int belowhalf, abovehalf;
if (curr < 5 || prev < 5)
return 0;
belowhalf = (prev * 8) / 20;
abovehalf = (prev * 12) / 20;
return belowhalf < curr && curr <= abovehalf;
}
/*
* Throw out oddly large delta packets, and any that immediately follow whose
* values are each approximately half of the previous. It seems that the ALPS
* firmware emits errant packets, and they get averaged out slowly.
*/
static int hgpk_discard_decay_hack(struct psmouse *psmouse, int x, int y)
{
struct hgpk_data *priv = psmouse->private;
int avx, avy;
bool do_recal = false;
avx = abs(x);
avy = abs(y);
/* discard if too big, or half that but > 4 times the prev delta */
if (avx > recalib_delta ||
(avx > recalib_delta / 2 && ((avx / 4) > priv->xlast))) {
psmouse_warn(psmouse, "detected %dpx jump in x\n", x);
priv->xbigj = avx;
} else if (approx_half(avx, priv->xbigj)) {
psmouse_warn(psmouse, "detected secondary %dpx jump in x\n", x);
priv->xbigj = avx;
priv->xsaw_secondary++;
} else {
if (priv->xbigj && priv->xsaw_secondary > 1)
do_recal = true;
priv->xbigj = 0;
priv->xsaw_secondary = 0;
}
if (avy > recalib_delta ||
(avy > recalib_delta / 2 && ((avy / 4) > priv->ylast))) {
psmouse_warn(psmouse, "detected %dpx jump in y\n", y);
priv->ybigj = avy;
} else if (approx_half(avy, priv->ybigj)) {
psmouse_warn(psmouse, "detected secondary %dpx jump in y\n", y);
priv->ybigj = avy;
priv->ysaw_secondary++;
} else {
if (priv->ybigj && priv->ysaw_secondary > 1)
do_recal = true;
priv->ybigj = 0;
priv->ysaw_secondary = 0;
}
priv->xlast = avx;
priv->ylast = avy;
if (do_recal && jumpy_delay) {
psmouse_warn(psmouse, "scheduling recalibration\n");
psmouse_queue_work(psmouse, &priv->recalib_wq,
msecs_to_jiffies(jumpy_delay));
}
return priv->xbigj || priv->ybigj;
}
static void hgpk_reset_spew_detection(struct hgpk_data *priv)
{
priv->spew_count = 0;
priv->dupe_count = 0;
priv->x_tally = 0;
priv->y_tally = 0;
priv->spew_flag = NO_SPEW;
}
static void hgpk_reset_hack_state(struct psmouse *psmouse)
{
struct hgpk_data *priv = psmouse->private;
priv->abs_x = priv->abs_y = -1;
priv->xlast = priv->ylast = ILLEGAL_XY;
priv->xbigj = priv->ybigj = 0;
priv->xsaw_secondary = priv->ysaw_secondary = 0;
hgpk_reset_spew_detection(priv);
}
/*
* We have no idea why this particular hardware bug occurs. The touchpad
* will randomly start spewing packets without anything touching the
* pad. This wouldn't necessarily be bad, but it's indicative of a
* severely miscalibrated pad; attempting to use the touchpad while it's
* spewing means the cursor will jump all over the place, and act "drunk".
*
* The packets that are spewed tend to all have deltas between -2 and 2, and
* the cursor will move around without really going very far. It will
* tend to end up in the same location; if we tally up the changes over
* 100 packets, we end up w/ a final delta of close to 0. This happens
* pretty regularly when the touchpad is spewing, and is pretty hard to
* manually trigger (at least for *my* fingers). So, it makes a perfect
* scheme for detecting spews.
*/
static void hgpk_spewing_hack(struct psmouse *psmouse,
int l, int r, int x, int y)
{
struct hgpk_data *priv = psmouse->private;
/* ignore button press packets; many in a row could trigger
* a false-positive! */
if (l || r)
return;
/* don't track spew if the workaround feature has been turned off */
if (!spew_delay)
return;
if (abs(x) > 3 || abs(y) > 3) {
/* no spew, or spew ended */
hgpk_reset_spew_detection(priv);
return;
}
/* Keep a tally of the overall delta to the cursor position caused by
* the spew */
priv->x_tally += x;
priv->y_tally += y;
switch (priv->spew_flag) {
case NO_SPEW:
/* we're not spewing, but this packet might be the start */
priv->spew_flag = MAYBE_SPEWING;
fallthrough;
case MAYBE_SPEWING:
priv->spew_count++;
if (priv->spew_count < SPEW_WATCH_COUNT)
break;
/* excessive spew detected, request recalibration */
priv->spew_flag = SPEW_DETECTED;
fallthrough;
case SPEW_DETECTED:
/* only recalibrate when the overall delta to the cursor
* is really small. if the spew is causing significant cursor
* movement, it is probably a case of the user moving the
* cursor very slowly across the screen. */
if (abs(priv->x_tally) < 3 && abs(priv->y_tally) < 3) {
psmouse_warn(psmouse, "packet spew detected (%d,%d)\n",
priv->x_tally, priv->y_tally);
priv->spew_flag = RECALIBRATING;
psmouse_queue_work(psmouse, &priv->recalib_wq,
msecs_to_jiffies(spew_delay));
}
break;
case RECALIBRATING:
/* we already detected a spew and requested a recalibration,
* just wait for the queue to kick into action. */
break;
}
}
/*
* HGPK Mouse Mode format (standard mouse format, sans middle button)
*
* byte 0: y-over x-over y-neg x-neg 1 0 swr swl
* byte 1: x7 x6 x5 x4 x3 x2 x1 x0
* byte 2: y7 y6 y5 y4 y3 y2 y1 y0
*
* swr/swl are the left/right buttons.
* x-neg/y-neg are the x and y delta negative bits
* x-over/y-over are the x and y overflow bits
*
* ---
*
* HGPK Advanced Mode - single-mode format
*
* byte 0(PT): 1 1 0 0 1 1 1 1
* byte 0(GS): 1 1 1 1 1 1 1 1
* byte 1: 0 x6 x5 x4 x3 x2 x1 x0
* byte 2(PT): 0 0 x9 x8 x7 ? pt-dsw 0
* 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 bool hgpk_is_byte_valid(struct psmouse *psmouse, unsigned char *packet)
{
struct hgpk_data *priv = psmouse->private;
int pktcnt = psmouse->pktcnt;
bool valid;
switch (priv->mode) {
case HGPK_MODE_MOUSE:
valid = (packet[0] & 0x0C) == 0x08;
break;
case HGPK_MODE_GLIDESENSOR:
valid = pktcnt == 1 ?
packet[0] == HGPK_GS : !(packet[pktcnt - 1] & 0x80);
break;
case HGPK_MODE_PENTABLET:
valid = pktcnt == 1 ?
packet[0] == HGPK_PT : !(packet[pktcnt - 1] & 0x80);
break;
default:
valid = false;
break;
}
if (!valid)
psmouse_dbg(psmouse,
"bad data, mode %d (%d) %*ph\n",
priv->mode, pktcnt, 6, psmouse->packet);
return valid;
}
static void hgpk_process_advanced_packet(struct psmouse *psmouse)
{
struct hgpk_data *priv = psmouse->private;
struct input_dev *idev = psmouse->dev;
unsigned char *packet = psmouse->packet;
int down = !!(packet[2] & 2);
int left = !!(packet[3] & 1);
int right = !!(packet[3] & 2);
int x = packet[1] | ((packet[2] & 0x78) << 4);
int y = packet[4] | ((packet[3] & 0x70) << 3);
if (priv->mode == HGPK_MODE_GLIDESENSOR) {
int pt_down = !!(packet[2] & 1);
int finger_down = !!(packet[2] & 2);
int z = packet[5];
input_report_abs(idev, ABS_PRESSURE, z);
if (tpdebug)
psmouse_dbg(psmouse, "pd=%d fd=%d z=%d",
pt_down, finger_down, z);
} else {
/*
* PenTablet mode does not report pressure, so we don't
* report it here
*/
if (tpdebug)
psmouse_dbg(psmouse, "pd=%d ", down);
}
if (tpdebug)
psmouse_dbg(psmouse, "l=%d r=%d x=%d y=%d\n",
left, right, x, y);
input_report_key(idev, BTN_TOUCH, down);
input_report_key(idev, BTN_LEFT, left);
input_report_key(idev, BTN_RIGHT, right);
/*
* If this packet says that the finger was removed, reset our position
* tracking so that we don't erroneously detect a jump on next press.
*/
if (!down) {
hgpk_reset_hack_state(psmouse);
goto done;
}
/*
* Weed out duplicate packets (we get quite a few, and they mess up
* our jump detection)
*/
if (x == priv->abs_x && y == priv->abs_y) {
if (++priv->dupe_count > SPEW_WATCH_COUNT) {
if (tpdebug)
psmouse_dbg(psmouse, "hard spew detected\n");
priv->spew_flag = RECALIBRATING;
psmouse_queue_work(psmouse, &priv->recalib_wq,
msecs_to_jiffies(spew_delay));
}
goto done;
}
/* not a duplicate, continue with position reporting */
priv->dupe_count = 0;
/* Don't apply hacks in PT mode, it seems reliable */
if (priv->mode != HGPK_MODE_PENTABLET && priv->abs_x != -1) {
int x_diff = priv->abs_x - x;
int y_diff = priv->abs_y - y;
if (hgpk_discard_decay_hack(psmouse, x_diff, y_diff)) {
if (tpdebug)
psmouse_dbg(psmouse, "discarding\n");
goto done;
}
hgpk_spewing_hack(psmouse, left, right, x_diff, y_diff);
}
input_report_abs(idev, ABS_X, x);
input_report_abs(idev, ABS_Y, y);
priv->abs_x = x;
priv->abs_y = y;
done:
input_sync(idev);
}
static void hgpk_process_simple_packet(struct psmouse *psmouse)
{
struct input_dev *dev = psmouse->dev;
unsigned char *packet = psmouse->packet;
int left = packet[0] & 1;
int right = (packet[0] >> 1) & 1;
int x = packet[1] - ((packet[0] << 4) & 0x100);
int y = ((packet[0] << 3) & 0x100) - packet[2];
if (packet[0] & 0xc0)
psmouse_dbg(psmouse,
"overflow -- 0x%02x 0x%02x 0x%02x\n",
packet[0], packet[1], packet[2]);
if (hgpk_discard_decay_hack(psmouse, x, y)) {
if (tpdebug)
psmouse_dbg(psmouse, "discarding\n");
return;
}
hgpk_spewing_hack(psmouse, left, right, x, y);
if (tpdebug)
psmouse_dbg(psmouse, "l=%d r=%d x=%d y=%d\n",
left, right, x, y);
input_report_key(dev, BTN_LEFT, left);
input_report_key(dev, BTN_RIGHT, right);
input_report_rel(dev, REL_X, x);
input_report_rel(dev, REL_Y, y);
input_sync(dev);
}
static psmouse_ret_t hgpk_process_byte(struct psmouse *psmouse)
{
struct hgpk_data *priv = psmouse->private;
if (!hgpk_is_byte_valid(psmouse, psmouse->packet))
return PSMOUSE_BAD_DATA;
if (psmouse->pktcnt >= psmouse->pktsize) {
if (priv->mode == HGPK_MODE_MOUSE)
hgpk_process_simple_packet(psmouse);
else
hgpk_process_advanced_packet(psmouse);
return PSMOUSE_FULL_PACKET;
}
if (priv->recalib_window) {
if (time_before(jiffies, priv->recalib_window)) {
/*
* ugh, got a packet inside our recalibration
* window, schedule another recalibration.
*/
psmouse_dbg(psmouse,
"packet inside calibration window, queueing another recalibration\n");
psmouse_queue_work(psmouse, &priv->recalib_wq,
msecs_to_jiffies(post_interrupt_delay));
}
priv->recalib_window = 0;
}
return PSMOUSE_GOOD_DATA;
}
static int hgpk_select_mode(struct psmouse *psmouse)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
struct hgpk_data *priv = psmouse->private;
int i;
int cmd;
/*
* 4 disables to enable advanced mode
* then 3 0xf2 bytes as the preamble for GS/PT selection
*/
const int advanced_init[] = {
PSMOUSE_CMD_DISABLE, PSMOUSE_CMD_DISABLE,
PSMOUSE_CMD_DISABLE, PSMOUSE_CMD_DISABLE,
0xf2, 0xf2, 0xf2,
};
switch (priv->mode) {
case HGPK_MODE_MOUSE:
psmouse->pktsize = 3;
break;
case HGPK_MODE_GLIDESENSOR:
case HGPK_MODE_PENTABLET:
psmouse->pktsize = 6;
/* Switch to 'Advanced mode.', four disables in a row. */
for (i = 0; i < ARRAY_SIZE(advanced_init); i++)
if (ps2_command(ps2dev, NULL, advanced_init[i]))
return -EIO;
/* select between GlideSensor (mouse) or PenTablet */
cmd = priv->mode == HGPK_MODE_GLIDESENSOR ?
PSMOUSE_CMD_SETSCALE11 : PSMOUSE_CMD_SETSCALE21;
if (ps2_command(ps2dev, NULL, cmd))
return -EIO;
break;
default:
return -EINVAL;
}
return 0;
}
static void hgpk_setup_input_device(struct input_dev *input,
struct input_dev *old_input,
enum hgpk_mode mode)
{
if (old_input) {
input->name = old_input->name;
input->phys = old_input->phys;
input->id = old_input->id;
input->dev.parent = old_input->dev.parent;
}
memset(input->evbit, 0, sizeof(input->evbit));
memset(input->relbit, 0, sizeof(input->relbit));
memset(input->keybit, 0, sizeof(input->keybit));
/* All modes report left and right buttons */
__set_bit(EV_KEY, input->evbit);
__set_bit(BTN_LEFT, input->keybit);
__set_bit(BTN_RIGHT, input->keybit);
switch (mode) {
case HGPK_MODE_MOUSE:
__set_bit(EV_REL, input->evbit);
__set_bit(REL_X, input->relbit);
__set_bit(REL_Y, input->relbit);
break;
case HGPK_MODE_GLIDESENSOR:
__set_bit(BTN_TOUCH, input->keybit);
__set_bit(BTN_TOOL_FINGER, input->keybit);
__set_bit(EV_ABS, input->evbit);
/* GlideSensor has pressure sensor, PenTablet does not */
input_set_abs_params(input, ABS_PRESSURE, 0, 15, 0, 0);
/* From device specs */
input_set_abs_params(input, ABS_X, 0, 399, 0, 0);
input_set_abs_params(input, ABS_Y, 0, 290, 0, 0);
/* Calculated by hand based on usable size (52mm x 38mm) */
input_abs_set_res(input, ABS_X, 8);
input_abs_set_res(input, ABS_Y, 8);
break;
case HGPK_MODE_PENTABLET:
__set_bit(BTN_TOUCH, input->keybit);
__set_bit(BTN_TOOL_FINGER, input->keybit);
__set_bit(EV_ABS, input->evbit);
/* From device specs */
input_set_abs_params(input, ABS_X, 0, 999, 0, 0);
input_set_abs_params(input, ABS_Y, 5, 239, 0, 0);
/* Calculated by hand based on usable size (156mm x 38mm) */
input_abs_set_res(input, ABS_X, 6);
input_abs_set_res(input, ABS_Y, 8);
break;
default:
BUG();
}
}
static int hgpk_reset_device(struct psmouse *psmouse, bool recalibrate)
{
int err;
psmouse_reset(psmouse);
if (recalibrate) {
struct ps2dev *ps2dev = &psmouse->ps2dev;
/* send the recalibrate request */
if (ps2_command(ps2dev, NULL, 0xf5) ||
ps2_command(ps2dev, NULL, 0xf5) ||
ps2_command(ps2dev, NULL, 0xe6) ||
ps2_command(ps2dev, NULL, 0xf5)) {
return -1;
}
/* according to ALPS, 150mS is required for recalibration */
msleep(150);
}
err = hgpk_select_mode(psmouse);
if (err) {
psmouse_err(psmouse, "failed to select mode\n");
return err;
}
hgpk_reset_hack_state(psmouse);
return 0;
}
static int hgpk_force_recalibrate(struct psmouse *psmouse)
{
struct hgpk_data *priv = psmouse->private;
int err;
/* C-series touchpads added the recalibrate command */
if (psmouse->model < HGPK_MODEL_C)
return 0;
if (!autorecal) {
psmouse_dbg(psmouse, "recalibration disabled, ignoring\n");
return 0;
}
psmouse_dbg(psmouse, "recalibrating touchpad..\n");
/* we don't want to race with the irq handler, nor with resyncs */
psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
/* start by resetting the device */
err = hgpk_reset_device(psmouse, true);
if (err)
return err;
/*
* XXX: If a finger is down during this delay, recalibration will
* detect capacitance incorrectly. This is a hardware bug, and
* we don't have a good way to deal with it. The 2s window stuff
* (below) is our best option for now.
*/
if (psmouse_activate(psmouse))
return -1;
if (tpdebug)
psmouse_dbg(psmouse, "touchpad reactivated\n");
/*
* If we get packets right away after recalibrating, it's likely
* that a finger was on the touchpad. If so, it's probably
* miscalibrated, so we optionally schedule another.
*/
if (recal_guard_time)
priv->recalib_window = jiffies +
msecs_to_jiffies(recal_guard_time);
return 0;
}
/*
* This puts the touchpad in a power saving mode; according to ALPS, current
* consumption goes down to 50uA after running this. To turn power back on,
* we drive MS-DAT low. Measuring with a 1mA resolution ammeter says that
* the current on the SUS_3.3V rail drops from 3mA or 4mA to 0 when we do this.
*
* We have no formal spec that details this operation -- the low-power
* sequence came from a long-lost email trail.
*/
static int hgpk_toggle_powersave(struct psmouse *psmouse, int enable)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
int timeo;
int err;
/* Added on D-series touchpads */
if (psmouse->model < HGPK_MODEL_D)
return 0;
if (enable) {
psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
/*
* Sending a byte will drive MS-DAT low; this will wake up
* the controller. Once we get an ACK back from it, it
* means we can continue with the touchpad re-init. ALPS
* tells us that 1s should be long enough, so set that as
* the upper bound. (in practice, it takes about 3 loops.)
*/
for (timeo = 20; timeo > 0; timeo--) {
if (!ps2_sendbyte(ps2dev, PSMOUSE_CMD_DISABLE, 20))
break;
msleep(25);
}
err = hgpk_reset_device(psmouse, false);
if (err) {
psmouse_err(psmouse, "Failed to reset device!\n");
return err;
}
/* should be all set, enable the touchpad */
psmouse_activate(psmouse);
psmouse_dbg(psmouse, "Touchpad powered up.\n");
} else {
psmouse_dbg(psmouse, "Powering off touchpad.\n");
if (ps2_command(ps2dev, NULL, 0xec) ||
ps2_command(ps2dev, NULL, 0xec) ||
ps2_command(ps2dev, NULL, 0xea)) {
return -1;
}
psmouse_set_state(psmouse, PSMOUSE_IGNORE);
/* probably won't see an ACK, the touchpad will be off */
ps2_sendbyte(ps2dev, 0xec, 20);
}
return 0;
}
static int hgpk_poll(struct psmouse *psmouse)
{
/* We can't poll, so always return failure. */
return -1;
}
static int hgpk_reconnect(struct psmouse *psmouse)
{
struct hgpk_data *priv = psmouse->private;
/*
* During suspend/resume the ps2 rails remain powered. We don't want
* to do a reset because it's flush data out of buffers; however,
* earlier prototypes (B1) had some brokenness that required a reset.
*/
if (olpc_board_at_least(olpc_board(0xb2)))
if (psmouse->ps2dev.serio->dev.power.power_state.event !=
PM_EVENT_ON)
return 0;
priv->powered = 1;
return hgpk_reset_device(psmouse, false);
}
static ssize_t hgpk_show_powered(struct psmouse *psmouse, void *data, char *buf)
{
struct hgpk_data *priv = psmouse->private;
return sprintf(buf, "%d\n", priv->powered);
}
static ssize_t hgpk_set_powered(struct psmouse *psmouse, void *data,
const char *buf, size_t count)
{
struct hgpk_data *priv = psmouse->private;
unsigned int value;
int err;
err = kstrtouint(buf, 10, &value);
if (err)
return err;
if (value > 1)
return -EINVAL;
if (value != priv->powered) {
/*
* hgpk_toggle_power will deal w/ state so
* we're not racing w/ irq
*/
err = hgpk_toggle_powersave(psmouse, value);
if (!err)
priv->powered = value;
}
return err ? err : count;
}
__PSMOUSE_DEFINE_ATTR(powered, S_IWUSR | S_IRUGO, NULL,
hgpk_show_powered, hgpk_set_powered, false);
static ssize_t attr_show_mode(struct psmouse *psmouse, void *data, char *buf)
{
struct hgpk_data *priv = psmouse->private;
return sprintf(buf, "%s\n", hgpk_mode_names[priv->mode]);
}
static ssize_t attr_set_mode(struct psmouse *psmouse, void *data,
const char *buf, size_t len)
{
struct hgpk_data *priv = psmouse->private;
enum hgpk_mode old_mode = priv->mode;
enum hgpk_mode new_mode = hgpk_mode_from_name(buf, len);
struct input_dev *old_dev = psmouse->dev;
struct input_dev *new_dev;
int err;
if (new_mode == HGPK_MODE_INVALID)
return -EINVAL;
if (old_mode == new_mode)
return len;
new_dev = input_allocate_device();
if (!new_dev)
return -ENOMEM;
psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
/* Switch device into the new mode */
priv->mode = new_mode;
err = hgpk_reset_device(psmouse, false);
if (err)
goto err_try_restore;
hgpk_setup_input_device(new_dev, old_dev, new_mode);
psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
err = input_register_device(new_dev);
if (err)
goto err_try_restore;
psmouse->dev = new_dev;
input_unregister_device(old_dev);
return len;
err_try_restore:
input_free_device(new_dev);
priv->mode = old_mode;
hgpk_reset_device(psmouse, false);
return err;
}
PSMOUSE_DEFINE_ATTR(hgpk_mode, S_IWUSR | S_IRUGO, NULL,
attr_show_mode, attr_set_mode);
static ssize_t hgpk_trigger_recal_show(struct psmouse *psmouse,
void *data, char *buf)
{
return -EINVAL;
}
static ssize_t hgpk_trigger_recal(struct psmouse *psmouse, void *data,
const char *buf, size_t count)
{
struct hgpk_data *priv = psmouse->private;
unsigned int value;
int err;
err = kstrtouint(buf, 10, &value);
if (err)
return err;
if (value != 1)
return -EINVAL;
/*
* We queue work instead of doing recalibration right here
* to avoid adding locking to hgpk_force_recalibrate()
* since workqueue provides serialization.
*/
psmouse_queue_work(psmouse, &priv->recalib_wq, 0);
return count;
}
__PSMOUSE_DEFINE_ATTR(recalibrate, S_IWUSR | S_IRUGO, NULL,
hgpk_trigger_recal_show, hgpk_trigger_recal, false);
static void hgpk_disconnect(struct psmouse *psmouse)
{
struct hgpk_data *priv = psmouse->private;
device_remove_file(&psmouse->ps2dev.serio->dev,
&psmouse_attr_powered.dattr);
device_remove_file(&psmouse->ps2dev.serio->dev,
&psmouse_attr_hgpk_mode.dattr);
if (psmouse->model >= HGPK_MODEL_C)
device_remove_file(&psmouse->ps2dev.serio->dev,
&psmouse_attr_recalibrate.dattr);
psmouse_reset(psmouse);
kfree(priv);
}
static void hgpk_recalib_work(struct work_struct *work)
{
struct delayed_work *w = to_delayed_work(work);
struct hgpk_data *priv = container_of(w, struct hgpk_data, recalib_wq);
struct psmouse *psmouse = priv->psmouse;
if (hgpk_force_recalibrate(psmouse))
psmouse_err(psmouse, "recalibration failed!\n");
}
static int hgpk_register(struct psmouse *psmouse)
{
struct hgpk_data *priv = psmouse->private;
int err;
/* register handlers */
psmouse->protocol_handler = hgpk_process_byte;
psmouse->poll = hgpk_poll;
psmouse->disconnect = hgpk_disconnect;
psmouse->reconnect = hgpk_reconnect;
/* Disable the idle resync. */
psmouse->resync_time = 0;
/* Reset after a lot of bad bytes. */
psmouse->resetafter = 1024;
hgpk_setup_input_device(psmouse->dev, NULL, priv->mode);
err = device_create_file(&psmouse->ps2dev.serio->dev,
&psmouse_attr_powered.dattr);
if (err) {
psmouse_err(psmouse, "Failed creating 'powered' sysfs node\n");
return err;
}
err = device_create_file(&psmouse->ps2dev.serio->dev,
&psmouse_attr_hgpk_mode.dattr);
if (err) {
psmouse_err(psmouse,
"Failed creating 'hgpk_mode' sysfs node\n");
goto err_remove_powered;
}
/* C-series touchpads added the recalibrate command */
if (psmouse->model >= HGPK_MODEL_C) {
err = device_create_file(&psmouse->ps2dev.serio->dev,
&psmouse_attr_recalibrate.dattr);
if (err) {
psmouse_err(psmouse,
"Failed creating 'recalibrate' sysfs node\n");
goto err_remove_mode;
}
}
return 0;
err_remove_mode:
device_remove_file(&psmouse->ps2dev.serio->dev,
&psmouse_attr_hgpk_mode.dattr);
err_remove_powered:
device_remove_file(&psmouse->ps2dev.serio->dev,
&psmouse_attr_powered.dattr);
return err;
}
int hgpk_init(struct psmouse *psmouse)
{
struct hgpk_data *priv;
int err;
priv = kzalloc(sizeof(struct hgpk_data), GFP_KERNEL);
if (!priv) {
err = -ENOMEM;
goto alloc_fail;
}
psmouse->private = priv;
priv->psmouse = psmouse;
priv->powered = true;
priv->mode = hgpk_default_mode;
INIT_DELAYED_WORK(&priv->recalib_wq, hgpk_recalib_work);
err = hgpk_reset_device(psmouse, false);
if (err)
goto init_fail;
err = hgpk_register(psmouse);
if (err)
goto init_fail;
return 0;
init_fail:
kfree(priv);
alloc_fail:
return err;
}
static enum hgpk_model_t hgpk_get_model(struct psmouse *psmouse)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
unsigned char param[3];
/* E7, E7, E7, E9 gets us a 3 byte identifier */
if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE21) ||
ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE21) ||
ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE21) ||
ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
return -EIO;
}
psmouse_dbg(psmouse, "ID: %*ph\n", 3, param);
/* HGPK signature: 0x67, 0x00, 0x<model> */
if (param[0] != 0x67 || param[1] != 0x00)
return -ENODEV;
psmouse_info(psmouse, "OLPC touchpad revision 0x%x\n", param[2]);
return param[2];
}
int hgpk_detect(struct psmouse *psmouse, bool set_properties)
{
int version;
version = hgpk_get_model(psmouse);
if (version < 0)
return version;
if (set_properties) {
psmouse->vendor = "ALPS";
psmouse->name = "HGPK";
psmouse->model = version;
}
return 0;
}
void hgpk_module_init(void)
{
hgpk_default_mode = hgpk_mode_from_name(hgpk_mode_name,
strlen(hgpk_mode_name));
if (hgpk_default_mode == HGPK_MODE_INVALID) {
hgpk_default_mode = HGPK_MODE_MOUSE;
strscpy(hgpk_mode_name, hgpk_mode_names[HGPK_MODE_MOUSE],
sizeof(hgpk_mode_name));
}
}