linux/drivers/input/mouse/hgpk.c
Erick Archer dc2f1423f0 Input: mouse - use sizeof(*pointer) instead of sizeof(type)
It is preferred to use sizeof(*pointer) instead of sizeof(type)
due to the type of the variable can change and one needs not
change the former (unlike the latter). This patch has no effect
on runtime behavior.

Signed-off-by: Erick Archer <erick.archer@outlook.com>
Link: https://lore.kernel.org/r/AS8PR02MB7237FB736DBF67A58798FDF38BFE2@AS8PR02MB7237.eurprd02.prod.outlook.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2024-06-02 21:32:02 -07:00

1064 lines
27 KiB
C

// 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(*priv), 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));
}
}