diff options
Diffstat (limited to 'drivers/input/joystick/magellan.c')
| -rw-r--r-- | drivers/input/joystick/magellan.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/drivers/input/joystick/magellan.c b/drivers/input/joystick/magellan.c new file mode 100644 index 000000000..edb8e1982 --- /dev/null +++ b/drivers/input/joystick/magellan.c @@ -0,0 +1,208 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 1999-2001 Vojtech Pavlik + */ + +/* + * Magellan and Space Mouse 6dof controller driver for Linux + */ + +/* + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/input.h> +#include <linux/serio.h> + +#define DRIVER_DESC "Magellan and SpaceMouse 6dof controller driver" + +MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); + +/* + * Definitions & global arrays. + */ + +#define MAGELLAN_MAX_LENGTH 32 + +static int magellan_buttons[] = { BTN_0, BTN_1, BTN_2, BTN_3, BTN_4, BTN_5, BTN_6, BTN_7, BTN_8 }; +static int magellan_axes[] = { ABS_X, ABS_Y, ABS_Z, ABS_RX, ABS_RY, ABS_RZ }; + +/* + * Per-Magellan data. + */ + +struct magellan { + struct input_dev *dev; + int idx; + unsigned char data[MAGELLAN_MAX_LENGTH]; + char phys[32]; +}; + +/* + * magellan_crunch_nibbles() verifies that the bytes sent from the Magellan + * have correct upper nibbles for the lower ones, if not, the packet will + * be thrown away. It also strips these upper halves to simplify further + * processing. + */ + +static int magellan_crunch_nibbles(unsigned char *data, int count) +{ + static unsigned char nibbles[16] = "0AB3D56GH9:K<MN?"; + + do { + if (data[count] == nibbles[data[count] & 0xf]) + data[count] = data[count] & 0xf; + else + return -1; + } while (--count); + + return 0; +} + +static void magellan_process_packet(struct magellan* magellan) +{ + struct input_dev *dev = magellan->dev; + unsigned char *data = magellan->data; + int i, t; + + if (!magellan->idx) return; + + switch (magellan->data[0]) { + + case 'd': /* Axis data */ + if (magellan->idx != 25) return; + if (magellan_crunch_nibbles(data, 24)) return; + for (i = 0; i < 6; i++) + input_report_abs(dev, magellan_axes[i], + (data[(i << 2) + 1] << 12 | data[(i << 2) + 2] << 8 | + data[(i << 2) + 3] << 4 | data[(i << 2) + 4]) - 32768); + break; + + case 'k': /* Button data */ + if (magellan->idx != 4) return; + if (magellan_crunch_nibbles(data, 3)) return; + t = (data[1] << 1) | (data[2] << 5) | data[3]; + for (i = 0; i < 9; i++) input_report_key(dev, magellan_buttons[i], (t >> i) & 1); + break; + } + + input_sync(dev); +} + +static irqreturn_t magellan_interrupt(struct serio *serio, + unsigned char data, unsigned int flags) +{ + struct magellan* magellan = serio_get_drvdata(serio); + + if (data == '\r') { + magellan_process_packet(magellan); + magellan->idx = 0; + } else { + if (magellan->idx < MAGELLAN_MAX_LENGTH) + magellan->data[magellan->idx++] = data; + } + return IRQ_HANDLED; +} + +/* + * magellan_disconnect() is the opposite of magellan_connect() + */ + +static void magellan_disconnect(struct serio *serio) +{ + struct magellan* magellan = serio_get_drvdata(serio); + + serio_close(serio); + serio_set_drvdata(serio, NULL); + input_unregister_device(magellan->dev); + kfree(magellan); +} + +/* + * magellan_connect() is the routine that is called when someone adds a + * new serio device that supports Magellan protocol and registers it as + * an input device. + */ + +static int magellan_connect(struct serio *serio, struct serio_driver *drv) +{ + struct magellan *magellan; + struct input_dev *input_dev; + int err = -ENOMEM; + int i; + + magellan = kzalloc(sizeof(struct magellan), GFP_KERNEL); + input_dev = input_allocate_device(); + if (!magellan || !input_dev) + goto fail1; + + magellan->dev = input_dev; + snprintf(magellan->phys, sizeof(magellan->phys), "%s/input0", serio->phys); + + input_dev->name = "LogiCad3D Magellan / SpaceMouse"; + input_dev->phys = magellan->phys; + input_dev->id.bustype = BUS_RS232; + input_dev->id.vendor = SERIO_MAGELLAN; + input_dev->id.product = 0x0001; + input_dev->id.version = 0x0100; + input_dev->dev.parent = &serio->dev; + + input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); + + for (i = 0; i < 9; i++) + set_bit(magellan_buttons[i], input_dev->keybit); + + for (i = 0; i < 6; i++) + input_set_abs_params(input_dev, magellan_axes[i], -360, 360, 0, 0); + + serio_set_drvdata(serio, magellan); + + err = serio_open(serio, drv); + if (err) + goto fail2; + + err = input_register_device(magellan->dev); + if (err) + goto fail3; + + return 0; + + fail3: serio_close(serio); + fail2: serio_set_drvdata(serio, NULL); + fail1: input_free_device(input_dev); + kfree(magellan); + return err; +} + +/* + * The serio driver structure. + */ + +static const struct serio_device_id magellan_serio_ids[] = { + { + .type = SERIO_RS232, + .proto = SERIO_MAGELLAN, + .id = SERIO_ANY, + .extra = SERIO_ANY, + }, + { 0 } +}; + +MODULE_DEVICE_TABLE(serio, magellan_serio_ids); + +static struct serio_driver magellan_drv = { + .driver = { + .name = "magellan", + }, + .description = DRIVER_DESC, + .id_table = magellan_serio_ids, + .interrupt = magellan_interrupt, + .connect = magellan_connect, + .disconnect = magellan_disconnect, +}; + +module_serio_driver(magellan_drv); |