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