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0958351e93
If elo_setup_10() fails then this should return an error code instead
of success.
Fixes: fae3006e4b ("Input: elo - add support for non-pressure-sensitive touchscreens")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/YBKFd5CvDu+jVmfW@mwanda
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
407 lines
8.5 KiB
C
407 lines
8.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Elo serial touchscreen driver
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*
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* Copyright (c) 2004 Vojtech Pavlik
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*/
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/*
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* This driver can handle serial Elo touchscreens using either the Elo standard
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* 'E271-2210' 10-byte protocol, Elo legacy 'E281A-4002' 6-byte protocol, Elo
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* legacy 'E271-140' 4-byte protocol and Elo legacy 'E261-280' 3-byte protocol.
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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/serio.h>
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#include <linux/ctype.h>
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#define DRIVER_DESC "Elo serial touchscreen driver"
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MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
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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 ELO_MAX_LENGTH 10
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#define ELO10_PACKET_LEN 8
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#define ELO10_TOUCH 0x03
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#define ELO10_PRESSURE 0x80
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#define ELO10_LEAD_BYTE 'U'
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#define ELO10_ID_CMD 'i'
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#define ELO10_TOUCH_PACKET 'T'
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#define ELO10_ACK_PACKET 'A'
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#define ELI10_ID_PACKET 'I'
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/*
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* Per-touchscreen data.
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*/
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struct elo {
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struct input_dev *dev;
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struct serio *serio;
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struct mutex cmd_mutex;
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struct completion cmd_done;
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int id;
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int idx;
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unsigned char expected_packet;
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unsigned char csum;
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unsigned char data[ELO_MAX_LENGTH];
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unsigned char response[ELO10_PACKET_LEN];
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char phys[32];
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};
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static void elo_process_data_10(struct elo *elo, unsigned char data)
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{
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struct input_dev *dev = elo->dev;
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elo->data[elo->idx] = data;
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switch (elo->idx++) {
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case 0:
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elo->csum = 0xaa;
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if (data != ELO10_LEAD_BYTE) {
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dev_dbg(&elo->serio->dev,
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"unsynchronized data: 0x%02x\n", data);
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elo->idx = 0;
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}
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break;
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case 9:
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elo->idx = 0;
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if (data != elo->csum) {
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dev_dbg(&elo->serio->dev,
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"bad checksum: 0x%02x, expected 0x%02x\n",
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data, elo->csum);
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break;
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}
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if (elo->data[1] != elo->expected_packet) {
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if (elo->data[1] != ELO10_TOUCH_PACKET)
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dev_dbg(&elo->serio->dev,
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"unexpected packet: 0x%02x\n",
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elo->data[1]);
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break;
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}
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if (likely(elo->data[1] == ELO10_TOUCH_PACKET)) {
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input_report_abs(dev, ABS_X, (elo->data[4] << 8) | elo->data[3]);
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input_report_abs(dev, ABS_Y, (elo->data[6] << 8) | elo->data[5]);
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if (elo->data[2] & ELO10_PRESSURE)
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input_report_abs(dev, ABS_PRESSURE,
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(elo->data[8] << 8) | elo->data[7]);
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input_report_key(dev, BTN_TOUCH, elo->data[2] & ELO10_TOUCH);
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input_sync(dev);
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} else if (elo->data[1] == ELO10_ACK_PACKET) {
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if (elo->data[2] == '0')
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elo->expected_packet = ELO10_TOUCH_PACKET;
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complete(&elo->cmd_done);
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} else {
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memcpy(elo->response, &elo->data[1], ELO10_PACKET_LEN);
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elo->expected_packet = ELO10_ACK_PACKET;
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}
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break;
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}
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elo->csum += data;
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}
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static void elo_process_data_6(struct elo *elo, unsigned char data)
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{
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struct input_dev *dev = elo->dev;
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elo->data[elo->idx] = data;
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switch (elo->idx++) {
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case 0:
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if ((data & 0xc0) != 0xc0)
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elo->idx = 0;
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break;
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case 1:
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if ((data & 0xc0) != 0x80)
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elo->idx = 0;
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break;
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case 2:
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if ((data & 0xc0) != 0x40)
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elo->idx = 0;
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break;
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case 3:
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if (data & 0xc0) {
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elo->idx = 0;
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break;
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}
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input_report_abs(dev, ABS_X, ((elo->data[0] & 0x3f) << 6) | (elo->data[1] & 0x3f));
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input_report_abs(dev, ABS_Y, ((elo->data[2] & 0x3f) << 6) | (elo->data[3] & 0x3f));
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if (elo->id == 2) {
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input_report_key(dev, BTN_TOUCH, 1);
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input_sync(dev);
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elo->idx = 0;
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}
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break;
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case 4:
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if (data) {
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input_sync(dev);
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elo->idx = 0;
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}
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break;
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case 5:
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if ((data & 0xf0) == 0) {
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input_report_abs(dev, ABS_PRESSURE, elo->data[5]);
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input_report_key(dev, BTN_TOUCH, !!elo->data[5]);
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}
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input_sync(dev);
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elo->idx = 0;
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break;
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}
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}
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static void elo_process_data_3(struct elo *elo, unsigned char data)
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{
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struct input_dev *dev = elo->dev;
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elo->data[elo->idx] = data;
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switch (elo->idx++) {
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case 0:
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if ((data & 0x7f) != 0x01)
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elo->idx = 0;
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break;
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case 2:
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input_report_key(dev, BTN_TOUCH, !(elo->data[1] & 0x80));
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input_report_abs(dev, ABS_X, elo->data[1]);
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input_report_abs(dev, ABS_Y, elo->data[2]);
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input_sync(dev);
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elo->idx = 0;
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break;
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}
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}
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static irqreturn_t elo_interrupt(struct serio *serio,
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unsigned char data, unsigned int flags)
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{
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struct elo *elo = serio_get_drvdata(serio);
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switch (elo->id) {
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case 0:
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elo_process_data_10(elo, data);
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break;
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case 1:
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case 2:
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elo_process_data_6(elo, data);
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break;
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case 3:
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elo_process_data_3(elo, data);
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break;
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}
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return IRQ_HANDLED;
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}
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static int elo_command_10(struct elo *elo, unsigned char *packet)
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{
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int rc = -1;
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int i;
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unsigned char csum = 0xaa + ELO10_LEAD_BYTE;
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mutex_lock(&elo->cmd_mutex);
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serio_pause_rx(elo->serio);
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elo->expected_packet = toupper(packet[0]);
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init_completion(&elo->cmd_done);
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serio_continue_rx(elo->serio);
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if (serio_write(elo->serio, ELO10_LEAD_BYTE))
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goto out;
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for (i = 0; i < ELO10_PACKET_LEN; i++) {
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csum += packet[i];
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if (serio_write(elo->serio, packet[i]))
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goto out;
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}
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if (serio_write(elo->serio, csum))
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goto out;
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wait_for_completion_timeout(&elo->cmd_done, HZ);
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if (elo->expected_packet == ELO10_TOUCH_PACKET) {
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/* We are back in reporting mode, the command was ACKed */
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memcpy(packet, elo->response, ELO10_PACKET_LEN);
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rc = 0;
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}
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out:
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mutex_unlock(&elo->cmd_mutex);
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return rc;
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}
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static int elo_setup_10(struct elo *elo)
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{
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static const char *elo_types[] = { "Accu", "Dura", "Intelli", "Carroll" };
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struct input_dev *dev = elo->dev;
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unsigned char packet[ELO10_PACKET_LEN] = { ELO10_ID_CMD };
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if (elo_command_10(elo, packet))
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return -1;
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dev->id.version = (packet[5] << 8) | packet[4];
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input_set_abs_params(dev, ABS_X, 96, 4000, 0, 0);
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input_set_abs_params(dev, ABS_Y, 96, 4000, 0, 0);
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if (packet[3] & ELO10_PRESSURE)
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input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);
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dev_info(&elo->serio->dev,
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"%sTouch touchscreen, fw: %02x.%02x, features: 0x%02x, controller: 0x%02x\n",
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elo_types[(packet[1] -'0') & 0x03],
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packet[5], packet[4], packet[3], packet[7]);
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return 0;
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}
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/*
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* elo_disconnect() is the opposite of elo_connect()
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*/
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static void elo_disconnect(struct serio *serio)
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{
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struct elo *elo = serio_get_drvdata(serio);
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input_get_device(elo->dev);
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input_unregister_device(elo->dev);
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serio_close(serio);
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serio_set_drvdata(serio, NULL);
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input_put_device(elo->dev);
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kfree(elo);
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}
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/*
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* elo_connect() is the routine that is called when someone adds a
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* new serio device that supports Gunze protocol and registers it as
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* an input device.
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*/
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static int elo_connect(struct serio *serio, struct serio_driver *drv)
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{
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struct elo *elo;
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struct input_dev *input_dev;
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int err;
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elo = kzalloc(sizeof(struct elo), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!elo || !input_dev) {
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err = -ENOMEM;
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goto fail1;
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}
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elo->serio = serio;
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elo->id = serio->id.id;
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elo->dev = input_dev;
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elo->expected_packet = ELO10_TOUCH_PACKET;
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mutex_init(&elo->cmd_mutex);
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init_completion(&elo->cmd_done);
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snprintf(elo->phys, sizeof(elo->phys), "%s/input0", serio->phys);
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input_dev->name = "Elo Serial TouchScreen";
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input_dev->phys = elo->phys;
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input_dev->id.bustype = BUS_RS232;
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input_dev->id.vendor = SERIO_ELO;
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input_dev->id.product = elo->id;
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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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serio_set_drvdata(serio, elo);
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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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switch (elo->id) {
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case 0: /* 10-byte protocol */
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if (elo_setup_10(elo)) {
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err = -EIO;
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goto fail3;
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}
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break;
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case 1: /* 6-byte protocol */
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input_set_abs_params(input_dev, ABS_PRESSURE, 0, 15, 0, 0);
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fallthrough;
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case 2: /* 4-byte protocol */
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input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0);
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input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0);
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break;
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case 3: /* 3-byte protocol */
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input_set_abs_params(input_dev, ABS_X, 0, 255, 0, 0);
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input_set_abs_params(input_dev, ABS_Y, 0, 255, 0, 0);
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break;
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}
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err = input_register_device(elo->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(elo);
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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 elo_serio_ids[] = {
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{
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.type = SERIO_RS232,
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.proto = SERIO_ELO,
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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, elo_serio_ids);
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static struct serio_driver elo_drv = {
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.driver = {
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.name = "elo",
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},
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.description = DRIVER_DESC,
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.id_table = elo_serio_ids,
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.interrupt = elo_interrupt,
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.connect = elo_connect,
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.disconnect = elo_disconnect,
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};
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module_serio_driver(elo_drv);
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