/* * 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 #include #include #include #include #include #include #define DRIVER_DESC "Elo serial touchscreen driver" MODULE_AUTHOR("Vojtech Pavlik "); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE("GPL"); /* * Definitions & global arrays. */ #define ELO_MAX_LENGTH 10 static char *elo_name = "Elo Serial TouchScreen"; /* * Per-touchscreen data. */ struct elo { struct input_dev dev; struct serio *serio; int id; int idx; unsigned char csum; unsigned char data[ELO_MAX_LENGTH]; char phys[32]; }; static void elo_process_data_10(struct elo* elo, unsigned char data, struct pt_regs *regs) { struct input_dev *dev = &elo->dev; elo->csum += elo->data[elo->idx] = data; switch (elo->idx++) { case 0: if (data != 'U') { elo->idx = 0; elo->csum = 0; } break; case 1: if (data != 'T') { elo->idx = 0; elo->csum = 0; } break; case 9: if (elo->csum) { input_regs(dev, regs); 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]); input_report_abs(dev, ABS_PRESSURE, (elo->data[8] << 8) | elo->data[7]); input_report_key(dev, BTN_TOUCH, elo->data[2] & 3); input_sync(dev); } elo->idx = 0; elo->csum = 0; break; } } static void elo_process_data_6(struct elo* elo, unsigned char data, struct pt_regs *regs) { 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_regs(dev, regs); 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 pt_regs *regs) { 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_regs(dev, regs); 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 pt_regs *regs) { struct elo* elo = serio_get_drvdata(serio); switch(elo->id) { case 0: elo_process_data_10(elo, data, regs); break; case 1: case 2: elo_process_data_6(elo, data, regs); break; case 3: elo_process_data_3(elo, data, regs); break; } return IRQ_HANDLED; } /* * elo_disconnect() is the opposite of elo_connect() */ static void elo_disconnect(struct serio *serio) { struct elo* elo = serio_get_drvdata(serio); input_unregister_device(&elo->dev); serio_close(serio); serio_set_drvdata(serio, NULL); 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; int err; if (!(elo = kmalloc(sizeof(struct elo), GFP_KERNEL))) return -ENOMEM; memset(elo, 0, sizeof(struct elo)); init_input_dev(&elo->dev); elo->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); elo->dev.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH); elo->id = serio->id.id; switch (elo->id) { case 0: /* 10-byte protocol */ input_set_abs_params(&elo->dev, ABS_X, 96, 4000, 0, 0); input_set_abs_params(&elo->dev, ABS_Y, 96, 4000, 0, 0); input_set_abs_params(&elo->dev, ABS_PRESSURE, 0, 255, 0, 0); break; case 1: /* 6-byte protocol */ input_set_abs_params(&elo->dev, ABS_PRESSURE, 0, 15, 0, 0); case 2: /* 4-byte protocol */ input_set_abs_params(&elo->dev, ABS_X, 96, 4000, 0, 0); input_set_abs_params(&elo->dev, ABS_Y, 96, 4000, 0, 0); break; case 3: /* 3-byte protocol */ input_set_abs_params(&elo->dev, ABS_X, 0, 255, 0, 0); input_set_abs_params(&elo->dev, ABS_Y, 0, 255, 0, 0); break; } elo->serio = serio; sprintf(elo->phys, "%s/input0", serio->phys); elo->dev.private = elo; elo->dev.name = elo_name; elo->dev.phys = elo->phys; elo->dev.id.bustype = BUS_RS232; elo->dev.id.vendor = SERIO_ELO; elo->dev.id.product = elo->id; elo->dev.id.version = 0x0100; serio_set_drvdata(serio, elo); err = serio_open(serio, drv); if (err) { serio_set_drvdata(serio, NULL); kfree(elo); return err; } input_register_device(&elo->dev); printk(KERN_INFO "input: %s on %s\n", elo_name, serio->phys); return 0; } /* * 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) { serio_register_driver(&elo_drv); return 0; } static void __exit elo_exit(void) { serio_unregister_driver(&elo_drv); } module_init(elo_init); module_exit(elo_exit);