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456 lines
11 KiB
456 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Focaltech TouchPad PS/2 mouse driver |
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* |
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* Copyright (c) 2014 Red Hat Inc. |
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* Copyright (c) 2014 Mathias Gottschlag <[email protected]> |
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* |
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* Red Hat authors: |
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* |
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* Hans de Goede <[email protected]> |
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*/ |
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#include <linux/device.h> |
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#include <linux/libps2.h> |
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#include <linux/input/mt.h> |
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#include <linux/serio.h> |
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#include <linux/slab.h> |
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#include "psmouse.h" |
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#include "focaltech.h" |
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static const char * const focaltech_pnp_ids[] = { |
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"FLT0101", |
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"FLT0102", |
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"FLT0103", |
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NULL |
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}; |
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/* |
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* Even if the kernel is built without support for Focaltech PS/2 touchpads (or |
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* when the real driver fails to recognize the device), we still have to detect |
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* them in order to avoid further detection attempts confusing the touchpad. |
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* This way it at least works in PS/2 mouse compatibility mode. |
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*/ |
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int focaltech_detect(struct psmouse *psmouse, bool set_properties) |
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{ |
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if (!psmouse_matches_pnp_id(psmouse, focaltech_pnp_ids)) |
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return -ENODEV; |
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if (set_properties) { |
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psmouse->vendor = "FocalTech"; |
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psmouse->name = "Touchpad"; |
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} |
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return 0; |
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} |
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#ifdef CONFIG_MOUSE_PS2_FOCALTECH |
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/* |
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* Packet types - the numbers are not consecutive, so we might be missing |
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* something here. |
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*/ |
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#define FOC_TOUCH 0x3 /* bitmap of active fingers */ |
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#define FOC_ABS 0x6 /* absolute position of one finger */ |
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#define FOC_REL 0x9 /* relative position of 1-2 fingers */ |
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#define FOC_MAX_FINGERS 5 |
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/* |
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* Current state of a single finger on the touchpad. |
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*/ |
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struct focaltech_finger_state { |
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/* The touchpad has generated a touch event for the finger */ |
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bool active; |
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/* |
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* The touchpad has sent position data for the finger. The |
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* flag is 0 when the finger is not active, and there is a |
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* time between the first touch event for the finger and the |
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* following absolute position packet for the finger where the |
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* touchpad has declared the finger to be valid, but we do not |
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* have any valid position yet. |
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*/ |
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bool valid; |
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/* |
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* Absolute position (from the bottom left corner) of the |
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* finger. |
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*/ |
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unsigned int x; |
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unsigned int y; |
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}; |
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/* |
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* Description of the current state of the touchpad hardware. |
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*/ |
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struct focaltech_hw_state { |
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/* |
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* The touchpad tracks the positions of the fingers for us, |
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* the array indices correspond to the finger indices returned |
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* in the report packages. |
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*/ |
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struct focaltech_finger_state fingers[FOC_MAX_FINGERS]; |
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/* |
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* Finger width 0-7 and 15 for a very big contact area. |
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* 15 value stays until the finger is released. |
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* Width is reported only in absolute packets. |
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* Since hardware reports width only for last touching finger, |
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* there is no need to store width for every specific finger, |
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* so we keep only last value reported. |
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*/ |
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unsigned int width; |
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/* True if the clickpad has been pressed. */ |
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bool pressed; |
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}; |
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struct focaltech_data { |
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unsigned int x_max, y_max; |
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struct focaltech_hw_state state; |
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}; |
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static void focaltech_report_state(struct psmouse *psmouse) |
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{ |
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struct focaltech_data *priv = psmouse->private; |
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struct focaltech_hw_state *state = &priv->state; |
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struct input_dev *dev = psmouse->dev; |
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int i; |
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for (i = 0; i < FOC_MAX_FINGERS; i++) { |
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struct focaltech_finger_state *finger = &state->fingers[i]; |
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bool active = finger->active && finger->valid; |
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input_mt_slot(dev, i); |
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input_mt_report_slot_state(dev, MT_TOOL_FINGER, active); |
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if (active) { |
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unsigned int clamped_x, clamped_y; |
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/* |
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* The touchpad might report invalid data, so we clamp |
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* the resulting values so that we do not confuse |
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* userspace. |
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*/ |
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clamped_x = clamp(finger->x, 0U, priv->x_max); |
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clamped_y = clamp(finger->y, 0U, priv->y_max); |
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input_report_abs(dev, ABS_MT_POSITION_X, clamped_x); |
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input_report_abs(dev, ABS_MT_POSITION_Y, |
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priv->y_max - clamped_y); |
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input_report_abs(dev, ABS_TOOL_WIDTH, state->width); |
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} |
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} |
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input_mt_report_pointer_emulation(dev, true); |
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input_report_key(dev, BTN_LEFT, state->pressed); |
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input_sync(dev); |
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} |
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static void focaltech_process_touch_packet(struct psmouse *psmouse, |
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unsigned char *packet) |
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{ |
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struct focaltech_data *priv = psmouse->private; |
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struct focaltech_hw_state *state = &priv->state; |
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unsigned char fingers = packet[1]; |
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int i; |
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state->pressed = (packet[0] >> 4) & 1; |
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/* the second byte contains a bitmap of all fingers touching the pad */ |
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for (i = 0; i < FOC_MAX_FINGERS; i++) { |
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state->fingers[i].active = fingers & 0x1; |
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if (!state->fingers[i].active) { |
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/* |
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* Even when the finger becomes active again, we still |
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* will have to wait for the first valid position. |
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*/ |
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state->fingers[i].valid = false; |
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} |
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fingers >>= 1; |
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} |
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} |
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static void focaltech_process_abs_packet(struct psmouse *psmouse, |
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unsigned char *packet) |
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{ |
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struct focaltech_data *priv = psmouse->private; |
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struct focaltech_hw_state *state = &priv->state; |
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unsigned int finger; |
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finger = (packet[1] >> 4) - 1; |
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if (finger >= FOC_MAX_FINGERS) { |
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psmouse_err(psmouse, "Invalid finger in abs packet: %d\n", |
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finger); |
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return; |
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} |
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state->pressed = (packet[0] >> 4) & 1; |
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state->fingers[finger].x = ((packet[1] & 0xf) << 8) | packet[2]; |
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state->fingers[finger].y = (packet[3] << 8) | packet[4]; |
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state->width = packet[5] >> 4; |
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state->fingers[finger].valid = true; |
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} |
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static void focaltech_process_rel_packet(struct psmouse *psmouse, |
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unsigned char *packet) |
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{ |
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struct focaltech_data *priv = psmouse->private; |
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struct focaltech_hw_state *state = &priv->state; |
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int finger1, finger2; |
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state->pressed = packet[0] >> 7; |
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finger1 = ((packet[0] >> 4) & 0x7) - 1; |
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if (finger1 < FOC_MAX_FINGERS) { |
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state->fingers[finger1].x += (char)packet[1]; |
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state->fingers[finger1].y += (char)packet[2]; |
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} else { |
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psmouse_err(psmouse, "First finger in rel packet invalid: %d\n", |
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finger1); |
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} |
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/* |
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* If there is an odd number of fingers, the last relative |
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* packet only contains one finger. In this case, the second |
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* finger index in the packet is 0 (we subtract 1 in the lines |
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* above to create array indices, so the finger will overflow |
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* and be above FOC_MAX_FINGERS). |
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*/ |
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finger2 = ((packet[3] >> 4) & 0x7) - 1; |
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if (finger2 < FOC_MAX_FINGERS) { |
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state->fingers[finger2].x += (char)packet[4]; |
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state->fingers[finger2].y += (char)packet[5]; |
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} |
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} |
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static void focaltech_process_packet(struct psmouse *psmouse) |
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{ |
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unsigned char *packet = psmouse->packet; |
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switch (packet[0] & 0xf) { |
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case FOC_TOUCH: |
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focaltech_process_touch_packet(psmouse, packet); |
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break; |
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case FOC_ABS: |
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focaltech_process_abs_packet(psmouse, packet); |
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break; |
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case FOC_REL: |
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focaltech_process_rel_packet(psmouse, packet); |
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break; |
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default: |
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psmouse_err(psmouse, "Unknown packet type: %02x\n", packet[0]); |
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break; |
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} |
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focaltech_report_state(psmouse); |
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} |
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static psmouse_ret_t focaltech_process_byte(struct psmouse *psmouse) |
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{ |
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if (psmouse->pktcnt >= 6) { /* Full packet received */ |
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focaltech_process_packet(psmouse); |
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return PSMOUSE_FULL_PACKET; |
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} |
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/* |
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* We might want to do some validation of the data here, but |
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* we do not know the protocol well enough |
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*/ |
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return PSMOUSE_GOOD_DATA; |
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} |
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static int focaltech_switch_protocol(struct psmouse *psmouse) |
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{ |
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struct ps2dev *ps2dev = &psmouse->ps2dev; |
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unsigned char param[3]; |
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param[0] = 0; |
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if (ps2_command(ps2dev, param, 0x10f8)) |
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return -EIO; |
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if (ps2_command(ps2dev, param, 0x10f8)) |
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return -EIO; |
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if (ps2_command(ps2dev, param, 0x10f8)) |
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return -EIO; |
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param[0] = 1; |
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if (ps2_command(ps2dev, param, 0x10f8)) |
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return -EIO; |
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if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETSCALE11)) |
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return -EIO; |
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if (ps2_command(ps2dev, param, PSMOUSE_CMD_ENABLE)) |
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return -EIO; |
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return 0; |
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} |
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static void focaltech_reset(struct psmouse *psmouse) |
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{ |
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ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS); |
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psmouse_reset(psmouse); |
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} |
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static void focaltech_disconnect(struct psmouse *psmouse) |
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{ |
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focaltech_reset(psmouse); |
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kfree(psmouse->private); |
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psmouse->private = NULL; |
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} |
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static int focaltech_reconnect(struct psmouse *psmouse) |
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{ |
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int error; |
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focaltech_reset(psmouse); |
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error = focaltech_switch_protocol(psmouse); |
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if (error) { |
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psmouse_err(psmouse, "Unable to initialize the device\n"); |
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return error; |
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} |
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return 0; |
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} |
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static void focaltech_set_input_params(struct psmouse *psmouse) |
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{ |
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struct input_dev *dev = psmouse->dev; |
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struct focaltech_data *priv = psmouse->private; |
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/* |
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* Undo part of setup done for us by psmouse core since touchpad |
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* is not a relative device. |
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*/ |
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__clear_bit(EV_REL, dev->evbit); |
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__clear_bit(REL_X, dev->relbit); |
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__clear_bit(REL_Y, dev->relbit); |
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__clear_bit(BTN_RIGHT, dev->keybit); |
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__clear_bit(BTN_MIDDLE, dev->keybit); |
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/* |
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* Now set up our capabilities. |
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*/ |
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__set_bit(EV_ABS, dev->evbit); |
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input_set_abs_params(dev, ABS_MT_POSITION_X, 0, priv->x_max, 0, 0); |
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input_set_abs_params(dev, ABS_MT_POSITION_Y, 0, priv->y_max, 0, 0); |
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input_set_abs_params(dev, ABS_TOOL_WIDTH, 0, 15, 0, 0); |
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input_mt_init_slots(dev, 5, INPUT_MT_POINTER); |
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__set_bit(INPUT_PROP_BUTTONPAD, dev->propbit); |
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} |
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static int focaltech_read_register(struct ps2dev *ps2dev, int reg, |
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unsigned char *param) |
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{ |
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if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETSCALE11)) |
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return -EIO; |
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param[0] = 0; |
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if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES)) |
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return -EIO; |
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if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES)) |
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return -EIO; |
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if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES)) |
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return -EIO; |
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param[0] = reg; |
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if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES)) |
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return -EIO; |
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if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) |
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return -EIO; |
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return 0; |
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} |
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static int focaltech_read_size(struct psmouse *psmouse) |
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{ |
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struct ps2dev *ps2dev = &psmouse->ps2dev; |
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struct focaltech_data *priv = psmouse->private; |
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char param[3]; |
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if (focaltech_read_register(ps2dev, 2, param)) |
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return -EIO; |
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/* not sure whether this is 100% correct */ |
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priv->x_max = (unsigned char)param[1] * 128; |
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priv->y_max = (unsigned char)param[2] * 128; |
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return 0; |
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} |
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static void focaltech_set_resolution(struct psmouse *psmouse, |
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unsigned int resolution) |
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{ |
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/* not supported yet */ |
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} |
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static void focaltech_set_rate(struct psmouse *psmouse, unsigned int rate) |
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{ |
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/* not supported yet */ |
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} |
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static void focaltech_set_scale(struct psmouse *psmouse, |
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enum psmouse_scale scale) |
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{ |
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/* not supported yet */ |
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} |
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int focaltech_init(struct psmouse *psmouse) |
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{ |
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struct focaltech_data *priv; |
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int error; |
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psmouse->private = priv = kzalloc(sizeof(struct focaltech_data), |
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GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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focaltech_reset(psmouse); |
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error = focaltech_read_size(psmouse); |
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if (error) { |
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psmouse_err(psmouse, |
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"Unable to read the size of the touchpad\n"); |
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goto fail; |
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} |
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error = focaltech_switch_protocol(psmouse); |
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if (error) { |
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psmouse_err(psmouse, "Unable to initialize the device\n"); |
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goto fail; |
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} |
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focaltech_set_input_params(psmouse); |
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psmouse->protocol_handler = focaltech_process_byte; |
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psmouse->pktsize = 6; |
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psmouse->disconnect = focaltech_disconnect; |
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psmouse->reconnect = focaltech_reconnect; |
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psmouse->cleanup = focaltech_reset; |
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/* resync is not supported yet */ |
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psmouse->resync_time = 0; |
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/* |
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* rate/resolution/scale changes are not supported yet, and |
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* the generic implementations of these functions seem to |
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* confuse some touchpads |
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*/ |
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psmouse->set_resolution = focaltech_set_resolution; |
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psmouse->set_rate = focaltech_set_rate; |
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psmouse->set_scale = focaltech_set_scale; |
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return 0; |
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fail: |
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focaltech_reset(psmouse); |
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kfree(priv); |
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return error; |
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} |
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#endif /* CONFIG_MOUSE_PS2_FOCALTECH */
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