// 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 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; <------><------>strlcpy(hgpk_mode_name, hgpk_mode_names[HGPK_MODE_MOUSE], <------><------><------>sizeof(hgpk_mode_name)); <------>} }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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