--- /dev/null
+/*
+ * Elo serial touchscreen driver
+ *
+ * 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.
+ */
+
+/*
+ * This driver can handle serial Elo touchscreens using either the Elo standard
+ * 'E271-2210' 10-byte protocol, Elo legacy 'E281A-4002' 6-byte protocol, Elo
+ * legacy 'E271-140' 4-byte protocol and Elo legacy 'E261-280' 3-byte protocol.
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/serio.h>
+#include <linux/ctype.h>
+
+#define DRIVER_DESC "Elo serial touchscreen driver"
+
+MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+/*
+ * Definitions & global arrays.
+ */
+
+#define ELO_MAX_LENGTH 10
+
+#define ELO10_PACKET_LEN 8
+#define ELO10_TOUCH 0x03
+#define ELO10_PRESSURE 0x80
+
+#define ELO10_LEAD_BYTE 'U'
+
+#define ELO10_ID_CMD 'i'
+
+#define ELO10_TOUCH_PACKET 'T'
+#define ELO10_ACK_PACKET 'A'
+#define ELI10_ID_PACKET 'I'
+
+/*
+ * Per-touchscreen data.
+ */
+
+struct elo {
+ struct input_dev *dev;
+ struct serio *serio;
+ struct mutex cmd_mutex;
+ struct completion cmd_done;
+ int id;
+ int idx;
+ unsigned char expected_packet;
+ unsigned char csum;
+ unsigned char data[ELO_MAX_LENGTH];
+ unsigned char response[ELO10_PACKET_LEN];
+ char phys[32];
+};
+
+static void elo_process_data_10(struct elo *elo, unsigned char data)
+{
+ struct input_dev *dev = elo->dev;
+
+ elo->data[elo->idx] = data;
+
+ switch (elo->idx++) {
+ case 0:
+ elo->csum = 0xaa;
+ if (data != ELO10_LEAD_BYTE) {
+ dev_dbg(&elo->serio->dev,
+ "unsynchronized data: 0x%02x\n", data);
+ elo->idx = 0;
+ }
+ break;
+
+ case 9:
+ elo->idx = 0;
+ if (data != elo->csum) {
+ dev_dbg(&elo->serio->dev,
+ "bad checksum: 0x%02x, expected 0x%02x\n",
+ data, elo->csum);
+ break;
+ }
+ if (elo->data[1] != elo->expected_packet) {
+ if (elo->data[1] != ELO10_TOUCH_PACKET)
+ dev_dbg(&elo->serio->dev,
+ "unexpected packet: 0x%02x\n",
+ elo->data[1]);
+ break;
+ }
+ if (likely(elo->data[1] == ELO10_TOUCH_PACKET)) {
+ input_report_abs(dev, ABS_X, (elo->data[4] << 8) | elo->data[3]);
+ input_report_abs(dev, ABS_Y, (elo->data[6] << 8) | elo->data[5]);
+ if (elo->data[2] & ELO10_PRESSURE)
+ input_report_abs(dev, ABS_PRESSURE,
+ (elo->data[8] << 8) | elo->data[7]);
+ input_report_key(dev, BTN_TOUCH, elo->data[2] & ELO10_TOUCH);
+ input_sync(dev);
+ } else if (elo->data[1] == ELO10_ACK_PACKET) {
+ if (elo->data[2] == '0')
+ elo->expected_packet = ELO10_TOUCH_PACKET;
+ complete(&elo->cmd_done);
+ } else {
+ memcpy(elo->response, &elo->data[1], ELO10_PACKET_LEN);
+ elo->expected_packet = ELO10_ACK_PACKET;
+ }
+ break;
+ }
+ elo->csum += data;
+}
+
+static void elo_process_data_6(struct elo *elo, unsigned char data)
+{
+ struct input_dev *dev = elo->dev;
+
+ elo->data[elo->idx] = data;
+
+ switch (elo->idx++) {
+
+ case 0:
+ if ((data & 0xc0) != 0xc0)
+ elo->idx = 0;
+ break;
+
+ case 1:
+ if ((data & 0xc0) != 0x80)
+ elo->idx = 0;
+ break;
+
+ case 2:
+ if ((data & 0xc0) != 0x40)
+ elo->idx = 0;
+ break;
+
+ case 3:
+ if (data & 0xc0) {
+ elo->idx = 0;
+ break;
+ }
+
+ input_report_abs(dev, ABS_X, ((elo->data[0] & 0x3f) << 6) | (elo->data[1] & 0x3f));
+ input_report_abs(dev, ABS_Y, ((elo->data[2] & 0x3f) << 6) | (elo->data[3] & 0x3f));
+
+ if (elo->id == 2) {
+ input_report_key(dev, BTN_TOUCH, 1);
+ input_sync(dev);
+ elo->idx = 0;
+ }
+
+ break;
+
+ case 4:
+ if (data) {
+ input_sync(dev);
+ elo->idx = 0;
+ }
+ break;
+
+ case 5:
+ if ((data & 0xf0) == 0) {
+ input_report_abs(dev, ABS_PRESSURE, elo->data[5]);
+ input_report_key(dev, BTN_TOUCH, !!elo->data[5]);
+ }
+ input_sync(dev);
+ elo->idx = 0;
+ break;
+ }
+}
+
+static void elo_process_data_3(struct elo *elo, unsigned char data)
+{
+ struct input_dev *dev = elo->dev;
+
+ elo->data[elo->idx] = data;
+
+ switch (elo->idx++) {
+
+ case 0:
+ if ((data & 0x7f) != 0x01)
+ elo->idx = 0;
+ break;
+ case 2:
+ input_report_key(dev, BTN_TOUCH, !(elo->data[1] & 0x80));
+ input_report_abs(dev, ABS_X, elo->data[1]);
+ input_report_abs(dev, ABS_Y, elo->data[2]);
+ input_sync(dev);
+ elo->idx = 0;
+ break;
+ }
+}
+
+static irqreturn_t elo_interrupt(struct serio *serio,
+ unsigned char data, unsigned int flags)
+{
+ struct elo *elo = serio_get_drvdata(serio);
+
+ switch (elo->id) {
+ case 0:
+ elo_process_data_10(elo, data);
+ break;
+
+ case 1:
+ case 2:
+ elo_process_data_6(elo, data);
+ break;
+
+ case 3:
+ elo_process_data_3(elo, data);
+ break;
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int elo_command_10(struct elo *elo, unsigned char *packet)
+{
+ int rc = -1;
+ int i;
+ unsigned char csum = 0xaa + ELO10_LEAD_BYTE;
+
+ mutex_lock(&elo->cmd_mutex);
+
+ serio_pause_rx(elo->serio);
+ elo->expected_packet = toupper(packet[0]);
+ init_completion(&elo->cmd_done);
+ serio_continue_rx(elo->serio);
+
+ if (serio_write(elo->serio, ELO10_LEAD_BYTE))
+ goto out;
+
+ for (i = 0; i < ELO10_PACKET_LEN; i++) {
+ csum += packet[i];
+ if (serio_write(elo->serio, packet[i]))
+ goto out;
+ }
+
+ if (serio_write(elo->serio, csum))
+ goto out;
+
+ wait_for_completion_timeout(&elo->cmd_done, HZ);
+
+ if (elo->expected_packet == ELO10_TOUCH_PACKET) {
+ /* We are back in reporting mode, the command was ACKed */
+ memcpy(packet, elo->response, ELO10_PACKET_LEN);
+ rc = 0;
+ }
+
+ out:
+ mutex_unlock(&elo->cmd_mutex);
+ return rc;
+}
+
+static int elo_setup_10(struct elo *elo)
+{
+ static const char *elo_types[] = { "Accu", "Dura", "Intelli", "Carroll" };
+ struct input_dev *dev = elo->dev;
+ unsigned char packet[ELO10_PACKET_LEN] = { ELO10_ID_CMD };
+
+ if (elo_command_10(elo, packet))
+ return -1;
+
+ dev->id.version = (packet[5] << 8) | packet[4];
+
+ input_set_abs_params(dev, ABS_X, 96, 4000, 0, 0);
+ input_set_abs_params(dev, ABS_Y, 96, 4000, 0, 0);
+ if (packet[3] & ELO10_PRESSURE)
+ input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);
+
+ dev_info(&elo->serio->dev,
+ "%sTouch touchscreen, fw: %02x.%02x, features: 0x%02x, controller: 0x%02x\n",
+ elo_types[(packet[1] -'0') & 0x03],
+ packet[5], packet[4], packet[3], packet[7]);
+
+ return 0;
+}
+
+/*
+ * elo_disconnect() is the opposite of elo_connect()
+ */
+
+static void elo_disconnect(struct serio *serio)
+{
+ struct elo *elo = serio_get_drvdata(serio);
+
+ input_get_device(elo->dev);
+ input_unregister_device(elo->dev);
+ serio_close(serio);
+ serio_set_drvdata(serio, NULL);
+ input_put_device(elo->dev);
+ kfree(elo);
+}
+
+/*
+ * elo_connect() is the routine that is called when someone adds a
+ * new serio device that supports Gunze protocol and registers it as
+ * an input device.
+ */
+
+static int elo_connect(struct serio *serio, struct serio_driver *drv)
+{
+ struct elo *elo;
+ struct input_dev *input_dev;
+ int err;
+
+ elo = kzalloc(sizeof(struct elo), GFP_KERNEL);
+ input_dev = input_allocate_device();
+ if (!elo || !input_dev) {
+ err = -ENOMEM;
+ goto fail1;
+ }
+
+ elo->serio = serio;
+ elo->id = serio->id.id;
+ elo->dev = input_dev;
+ elo->expected_packet = ELO10_TOUCH_PACKET;
+ mutex_init(&elo->cmd_mutex);
+ init_completion(&elo->cmd_done);
+ snprintf(elo->phys, sizeof(elo->phys), "%s/input0", serio->phys);
+
+ input_dev->name = "Elo Serial TouchScreen";
+ input_dev->phys = elo->phys;
+ input_dev->id.bustype = BUS_RS232;
+ input_dev->id.vendor = SERIO_ELO;
+ input_dev->id.product = elo->id;
+ 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);
+
+ serio_set_drvdata(serio, elo);
+ err = serio_open(serio, drv);
+ if (err)
+ goto fail2;
+
+ switch (elo->id) {
+
+ case 0: /* 10-byte protocol */
+ if (elo_setup_10(elo))
+ goto fail3;
+
+ break;
+
+ case 1: /* 6-byte protocol */
+ input_set_abs_params(input_dev, ABS_PRESSURE, 0, 15, 0, 0);
+
+ case 2: /* 4-byte protocol */
+ input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0);
+ input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0);
+ break;
+
+ case 3: /* 3-byte protocol */
+ input_set_abs_params(input_dev, ABS_X, 0, 255, 0, 0);
+ input_set_abs_params(input_dev, ABS_Y, 0, 255, 0, 0);
+ break;
+ }
+
+ err = input_register_device(elo->dev);
+ if (err)
+ goto fail3;
+
+ return 0;
+
+ fail3: serio_close(serio);
+ fail2: serio_set_drvdata(serio, NULL);
+ fail1: input_free_device(input_dev);
+ kfree(elo);
+ return err;
+}
+
+/*
+ * The serio driver structure.
+ */
+
+static struct serio_device_id elo_serio_ids[] = {
+ {
+ .type = SERIO_RS232,
+ .proto = SERIO_ELO,
+ .id = SERIO_ANY,
+ .extra = SERIO_ANY,
+ },
+ { 0 }
+};
+
+MODULE_DEVICE_TABLE(serio, elo_serio_ids);
+
+static struct serio_driver elo_drv = {
+ .driver = {
+ .name = "elo",
+ },
+ .description = DRIVER_DESC,
+ .id_table = elo_serio_ids,
+ .interrupt = elo_interrupt,
+ .connect = elo_connect,
+ .disconnect = elo_disconnect,
+};
+
+module_serio_driver(elo_drv);
Code Review / kvmfornfv.git / blobdiff