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208 lines
4.7 KiB
208 lines
4.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (c) 1999-2001 Vojtech Pavlik |
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*/ |
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/* |
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* Magellan and Space Mouse 6dof controller driver for Linux |
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*/ |
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/* |
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*/ |
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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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#define DRIVER_DESC "Magellan and SpaceMouse 6dof controller driver" |
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MODULE_AUTHOR("Vojtech Pavlik <[email protected]>"); |
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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 MAGELLAN_MAX_LENGTH 32 |
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static int magellan_buttons[] = { BTN_0, BTN_1, BTN_2, BTN_3, BTN_4, BTN_5, BTN_6, BTN_7, BTN_8 }; |
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static int magellan_axes[] = { ABS_X, ABS_Y, ABS_Z, ABS_RX, ABS_RY, ABS_RZ }; |
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/* |
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* Per-Magellan data. |
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*/ |
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struct magellan { |
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struct input_dev *dev; |
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int idx; |
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unsigned char data[MAGELLAN_MAX_LENGTH]; |
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char phys[32]; |
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}; |
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/* |
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* magellan_crunch_nibbles() verifies that the bytes sent from the Magellan |
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* have correct upper nibbles for the lower ones, if not, the packet will |
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* be thrown away. It also strips these upper halves to simplify further |
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* processing. |
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*/ |
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static int magellan_crunch_nibbles(unsigned char *data, int count) |
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{ |
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static unsigned char nibbles[16] = "0AB3D56GH9:K<MN?"; |
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do { |
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if (data[count] == nibbles[data[count] & 0xf]) |
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data[count] = data[count] & 0xf; |
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else |
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return -1; |
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} while (--count); |
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return 0; |
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} |
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static void magellan_process_packet(struct magellan* magellan) |
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{ |
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struct input_dev *dev = magellan->dev; |
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unsigned char *data = magellan->data; |
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int i, t; |
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if (!magellan->idx) return; |
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switch (magellan->data[0]) { |
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case 'd': /* Axis data */ |
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if (magellan->idx != 25) return; |
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if (magellan_crunch_nibbles(data, 24)) return; |
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for (i = 0; i < 6; i++) |
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input_report_abs(dev, magellan_axes[i], |
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(data[(i << 2) + 1] << 12 | data[(i << 2) + 2] << 8 | |
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data[(i << 2) + 3] << 4 | data[(i << 2) + 4]) - 32768); |
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break; |
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case 'k': /* Button data */ |
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if (magellan->idx != 4) return; |
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if (magellan_crunch_nibbles(data, 3)) return; |
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t = (data[1] << 1) | (data[2] << 5) | data[3]; |
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for (i = 0; i < 9; i++) input_report_key(dev, magellan_buttons[i], (t >> i) & 1); |
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break; |
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} |
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input_sync(dev); |
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} |
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static irqreturn_t magellan_interrupt(struct serio *serio, |
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unsigned char data, unsigned int flags) |
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{ |
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struct magellan* magellan = serio_get_drvdata(serio); |
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if (data == '\r') { |
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magellan_process_packet(magellan); |
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magellan->idx = 0; |
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} else { |
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if (magellan->idx < MAGELLAN_MAX_LENGTH) |
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magellan->data[magellan->idx++] = data; |
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} |
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return IRQ_HANDLED; |
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} |
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/* |
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* magellan_disconnect() is the opposite of magellan_connect() |
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*/ |
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static void magellan_disconnect(struct serio *serio) |
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{ |
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struct magellan* magellan = serio_get_drvdata(serio); |
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serio_close(serio); |
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serio_set_drvdata(serio, NULL); |
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input_unregister_device(magellan->dev); |
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kfree(magellan); |
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} |
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/* |
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* magellan_connect() is the routine that is called when someone adds a |
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* new serio device that supports Magellan protocol and registers it as |
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* an input device. |
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*/ |
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static int magellan_connect(struct serio *serio, struct serio_driver *drv) |
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{ |
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struct magellan *magellan; |
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struct input_dev *input_dev; |
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int err = -ENOMEM; |
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int i; |
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magellan = kzalloc(sizeof(struct magellan), GFP_KERNEL); |
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input_dev = input_allocate_device(); |
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if (!magellan || !input_dev) |
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goto fail1; |
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magellan->dev = input_dev; |
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snprintf(magellan->phys, sizeof(magellan->phys), "%s/input0", serio->phys); |
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input_dev->name = "LogiCad3D Magellan / SpaceMouse"; |
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input_dev->phys = magellan->phys; |
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input_dev->id.bustype = BUS_RS232; |
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input_dev->id.vendor = SERIO_MAGELLAN; |
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input_dev->id.product = 0x0001; |
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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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for (i = 0; i < 9; i++) |
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set_bit(magellan_buttons[i], input_dev->keybit); |
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for (i = 0; i < 6; i++) |
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input_set_abs_params(input_dev, magellan_axes[i], -360, 360, 0, 0); |
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serio_set_drvdata(serio, magellan); |
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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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err = input_register_device(magellan->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(magellan); |
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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 magellan_serio_ids[] = { |
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{ |
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.type = SERIO_RS232, |
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.proto = SERIO_MAGELLAN, |
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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, magellan_serio_ids); |
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static struct serio_driver magellan_drv = { |
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.driver = { |
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.name = "magellan", |
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}, |
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.description = DRIVER_DESC, |
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.id_table = magellan_serio_ids, |
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.interrupt = magellan_interrupt, |
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.connect = magellan_connect, |
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.disconnect = magellan_disconnect, |
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}; |
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module_serio_driver(magellan_drv);
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