+++ /dev/null
-// 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_obj(*priv);
- 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));
- }
-}
projects / thirdparty / kernel / stable.git / commitdiff
