316 lines
6.8 KiB
C
316 lines
6.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Penmount serial touchscreen driver
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*
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* Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
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* Copyright (c) 2011 John Sung <penmount.touch@gmail.com>
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*
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* Based on ELO driver (drivers/input/touchscreen/elo.c)
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* Copyright (c) 2004 Vojtech Pavlik
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*/
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/input.h>
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#include <linux/input/mt.h>
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#include <linux/serio.h>
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#define DRIVER_DESC "PenMount serial touchscreen driver"
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MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
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MODULE_AUTHOR("John Sung <penmount.touch@gmail.com>");
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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/*
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* Definitions & global arrays.
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*/
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#define PM_MAX_LENGTH 6
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#define PM_MAX_MTSLOT 16
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#define PM_3000_MTSLOT 2
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#define PM_6250_MTSLOT 12
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/*
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* Multi-touch slot
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*/
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struct mt_slot {
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unsigned short x, y;
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bool active; /* is the touch valid? */
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};
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/*
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* Per-touchscreen data.
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*/
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struct pm {
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struct input_dev *dev;
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struct serio *serio;
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int idx;
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unsigned char data[PM_MAX_LENGTH];
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char phys[32];
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unsigned char packetsize;
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unsigned char maxcontacts;
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struct mt_slot slots[PM_MAX_MTSLOT];
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void (*parse_packet)(struct pm *);
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};
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/*
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* pm_mtevent() sends mt events and also emulates pointer movement
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*/
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static void pm_mtevent(struct pm *pm, struct input_dev *input)
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{
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int i;
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for (i = 0; i < pm->maxcontacts; ++i) {
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input_mt_slot(input, i);
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input_mt_report_slot_state(input, MT_TOOL_FINGER,
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pm->slots[i].active);
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if (pm->slots[i].active) {
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input_event(input, EV_ABS, ABS_MT_POSITION_X, pm->slots[i].x);
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input_event(input, EV_ABS, ABS_MT_POSITION_Y, pm->slots[i].y);
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}
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}
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input_mt_report_pointer_emulation(input, true);
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input_sync(input);
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}
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/*
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* pm_checkpacket() checks if data packet is valid
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*/
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static bool pm_checkpacket(unsigned char *packet)
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{
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int total = 0;
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int i;
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for (i = 0; i < 5; i++)
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total += packet[i];
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return packet[5] == (unsigned char)~(total & 0xff);
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}
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static void pm_parse_9000(struct pm *pm)
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{
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struct input_dev *dev = pm->dev;
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if ((pm->data[0] & 0x80) && pm->packetsize == ++pm->idx) {
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input_report_abs(dev, ABS_X, pm->data[1] * 128 + pm->data[2]);
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input_report_abs(dev, ABS_Y, pm->data[3] * 128 + pm->data[4]);
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input_report_key(dev, BTN_TOUCH, !!(pm->data[0] & 0x40));
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input_sync(dev);
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pm->idx = 0;
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}
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}
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static void pm_parse_6000(struct pm *pm)
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{
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struct input_dev *dev = pm->dev;
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if ((pm->data[0] & 0xbf) == 0x30 && pm->packetsize == ++pm->idx) {
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if (pm_checkpacket(pm->data)) {
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input_report_abs(dev, ABS_X,
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pm->data[2] * 256 + pm->data[1]);
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input_report_abs(dev, ABS_Y,
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pm->data[4] * 256 + pm->data[3]);
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input_report_key(dev, BTN_TOUCH, pm->data[0] & 0x40);
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input_sync(dev);
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}
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pm->idx = 0;
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}
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}
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static void pm_parse_3000(struct pm *pm)
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{
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struct input_dev *dev = pm->dev;
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if ((pm->data[0] & 0xce) == 0x40 && pm->packetsize == ++pm->idx) {
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if (pm_checkpacket(pm->data)) {
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int slotnum = pm->data[0] & 0x0f;
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pm->slots[slotnum].active = pm->data[0] & 0x30;
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pm->slots[slotnum].x = pm->data[2] * 256 + pm->data[1];
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pm->slots[slotnum].y = pm->data[4] * 256 + pm->data[3];
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pm_mtevent(pm, dev);
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}
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pm->idx = 0;
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}
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}
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static void pm_parse_6250(struct pm *pm)
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{
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struct input_dev *dev = pm->dev;
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if ((pm->data[0] & 0xb0) == 0x30 && pm->packetsize == ++pm->idx) {
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if (pm_checkpacket(pm->data)) {
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int slotnum = pm->data[0] & 0x0f;
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pm->slots[slotnum].active = pm->data[0] & 0x40;
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pm->slots[slotnum].x = pm->data[2] * 256 + pm->data[1];
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pm->slots[slotnum].y = pm->data[4] * 256 + pm->data[3];
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pm_mtevent(pm, dev);
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}
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pm->idx = 0;
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}
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}
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static irqreturn_t pm_interrupt(struct serio *serio,
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unsigned char data, unsigned int flags)
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{
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struct pm *pm = serio_get_drvdata(serio);
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pm->data[pm->idx] = data;
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pm->parse_packet(pm);
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return IRQ_HANDLED;
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}
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/*
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* pm_disconnect() is the opposite of pm_connect()
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*/
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static void pm_disconnect(struct serio *serio)
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{
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struct pm *pm = serio_get_drvdata(serio);
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serio_close(serio);
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input_unregister_device(pm->dev);
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kfree(pm);
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serio_set_drvdata(serio, NULL);
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}
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/*
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* pm_connect() is the routine that is called when someone adds a
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* new serio device that supports PenMount protocol and registers it as
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* an input device.
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*/
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static int pm_connect(struct serio *serio, struct serio_driver *drv)
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{
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struct pm *pm;
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struct input_dev *input_dev;
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int max_x, max_y;
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int err;
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pm = kzalloc(sizeof(struct pm), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!pm || !input_dev) {
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err = -ENOMEM;
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goto fail1;
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}
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pm->serio = serio;
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pm->dev = input_dev;
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snprintf(pm->phys, sizeof(pm->phys), "%s/input0", serio->phys);
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pm->maxcontacts = 1;
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input_dev->name = "PenMount Serial TouchScreen";
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input_dev->phys = pm->phys;
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input_dev->id.bustype = BUS_RS232;
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input_dev->id.vendor = SERIO_PENMOUNT;
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input_dev->id.product = 0;
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input_dev->id.version = 0x0100;
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input_dev->dev.parent = &serio->dev;
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input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
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input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
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switch (serio->id.id) {
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default:
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case 0:
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pm->packetsize = 5;
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pm->parse_packet = pm_parse_9000;
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input_dev->id.product = 0x9000;
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max_x = max_y = 0x3ff;
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break;
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case 1:
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pm->packetsize = 6;
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pm->parse_packet = pm_parse_6000;
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input_dev->id.product = 0x6000;
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max_x = max_y = 0x3ff;
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break;
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case 2:
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pm->packetsize = 6;
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pm->parse_packet = pm_parse_3000;
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input_dev->id.product = 0x3000;
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max_x = max_y = 0x7ff;
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pm->maxcontacts = PM_3000_MTSLOT;
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break;
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case 3:
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pm->packetsize = 6;
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pm->parse_packet = pm_parse_6250;
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input_dev->id.product = 0x6250;
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max_x = max_y = 0x3ff;
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pm->maxcontacts = PM_6250_MTSLOT;
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break;
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}
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input_set_abs_params(pm->dev, ABS_X, 0, max_x, 0, 0);
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input_set_abs_params(pm->dev, ABS_Y, 0, max_y, 0, 0);
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if (pm->maxcontacts > 1) {
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input_mt_init_slots(pm->dev, pm->maxcontacts, 0);
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input_set_abs_params(pm->dev,
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ABS_MT_POSITION_X, 0, max_x, 0, 0);
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input_set_abs_params(pm->dev,
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ABS_MT_POSITION_Y, 0, max_y, 0, 0);
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}
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serio_set_drvdata(serio, pm);
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err = serio_open(serio, drv);
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if (err)
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goto fail2;
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err = input_register_device(pm->dev);
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if (err)
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goto fail3;
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return 0;
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fail3: serio_close(serio);
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fail2: serio_set_drvdata(serio, NULL);
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fail1: input_free_device(input_dev);
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kfree(pm);
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return err;
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}
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/*
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* The serio driver structure.
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*/
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static const struct serio_device_id pm_serio_ids[] = {
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{
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.type = SERIO_RS232,
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.proto = SERIO_PENMOUNT,
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.id = SERIO_ANY,
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.extra = SERIO_ANY,
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},
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{ 0 }
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};
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MODULE_DEVICE_TABLE(serio, pm_serio_ids);
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static struct serio_driver pm_drv = {
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.driver = {
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.name = "serio-penmount",
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},
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.description = DRIVER_DESC,
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.id_table = pm_serio_ids,
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.interrupt = pm_interrupt,
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.connect = pm_connect,
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.disconnect = pm_disconnect,
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};
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module_serio_driver(pm_drv);
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