/* * 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/init.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) { pr_debug("elo: unsynchronized data: 0x%02x\n", data); elo->idx = 0; } break; case 9: elo->idx = 0; if (data != elo->csum) { pr_debug("elo: 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) pr_debug("elo: 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); printk(KERN_INFO "elo: %sTouch touchscreen, fw: %02x.%02x, " "features: %x02x, 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, }; /* * The functions for inserting/removing us as a module. */ static int __init elo_init(void) { return serio_register_driver(&elo_drv); } static void __exit elo_exit(void) { serio_unregister_driver(&elo_drv); } module_init(elo_init); module_exit(elo_exit);