diff options
Diffstat (limited to 'drivers/input/joystick/cobra.c')
| -rw-r--r-- | drivers/input/joystick/cobra.c | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/drivers/input/joystick/cobra.c b/drivers/input/joystick/cobra.c new file mode 100644 index 000000000..7ff78c938 --- /dev/null +++ b/drivers/input/joystick/cobra.c @@ -0,0 +1,244 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 1999-2001 Vojtech Pavlik + */ + +/* + * Creative Labs Blaster GamePad Cobra driver for Linux + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/gameport.h> +#include <linux/input.h> +#include <linux/jiffies.h> + +#define DRIVER_DESC "Creative Labs Blaster GamePad Cobra driver" + +MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); + +#define COBRA_MAX_STROBE 45 /* 45 us max wait for first strobe */ +#define COBRA_LENGTH 36 + +static int cobra_btn[] = { BTN_START, BTN_SELECT, BTN_TL, BTN_TR, BTN_X, BTN_Y, BTN_Z, BTN_A, BTN_B, BTN_C, BTN_TL2, BTN_TR2, 0 }; + +struct cobra { + struct gameport *gameport; + struct input_dev *dev[2]; + int reads; + int bads; + unsigned char exists; + char phys[2][32]; +}; + +static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data) +{ + unsigned long flags; + unsigned char u, v, w; + __u64 buf[2]; + int r[2], t[2]; + int i, j, ret; + + int strobe = gameport_time(gameport, COBRA_MAX_STROBE); + + for (i = 0; i < 2; i++) { + r[i] = buf[i] = 0; + t[i] = COBRA_MAX_STROBE; + } + + local_irq_save(flags); + + u = gameport_read(gameport); + + do { + t[0]--; t[1]--; + v = gameport_read(gameport); + for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2) + if (w & 0x30) { + if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) { + buf[i] |= (__u64)((w >> 5) & 1) << r[i]++; + t[i] = strobe; + u = v; + } else t[i] = 0; + } + } while (t[0] > 0 || t[1] > 0); + + local_irq_restore(flags); + + ret = 0; + + for (i = 0; i < 2; i++) { + + if (r[i] != COBRA_LENGTH) continue; + + for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++) + buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1)); + + if (j < COBRA_LENGTH) ret |= (1 << i); + + data[i] = ((buf[i] >> 7) & 0x000001f) | ((buf[i] >> 8) & 0x00003e0) + | ((buf[i] >> 9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000) + | ((buf[i] >> 11) & 0x1f00000); + + } + + return ret; +} + +static void cobra_poll(struct gameport *gameport) +{ + struct cobra *cobra = gameport_get_drvdata(gameport); + struct input_dev *dev; + unsigned int data[2]; + int i, j, r; + + cobra->reads++; + + if ((r = cobra_read_packet(gameport, data)) != cobra->exists) { + cobra->bads++; + return; + } + + for (i = 0; i < 2; i++) + if (cobra->exists & r & (1 << i)) { + + dev = cobra->dev[i]; + + input_report_abs(dev, ABS_X, ((data[i] >> 4) & 1) - ((data[i] >> 3) & 1)); + input_report_abs(dev, ABS_Y, ((data[i] >> 2) & 1) - ((data[i] >> 1) & 1)); + + for (j = 0; cobra_btn[j]; j++) + input_report_key(dev, cobra_btn[j], data[i] & (0x20 << j)); + + input_sync(dev); + + } +} + +static int cobra_open(struct input_dev *dev) +{ + struct cobra *cobra = input_get_drvdata(dev); + + gameport_start_polling(cobra->gameport); + return 0; +} + +static void cobra_close(struct input_dev *dev) +{ + struct cobra *cobra = input_get_drvdata(dev); + + gameport_stop_polling(cobra->gameport); +} + +static int cobra_connect(struct gameport *gameport, struct gameport_driver *drv) +{ + struct cobra *cobra; + struct input_dev *input_dev; + unsigned int data[2]; + int i, j; + int err; + + cobra = kzalloc(sizeof(struct cobra), GFP_KERNEL); + if (!cobra) + return -ENOMEM; + + cobra->gameport = gameport; + + gameport_set_drvdata(gameport, cobra); + + err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW); + if (err) + goto fail1; + + cobra->exists = cobra_read_packet(gameport, data); + + for (i = 0; i < 2; i++) + if ((cobra->exists >> i) & data[i] & 1) { + printk(KERN_WARNING "cobra.c: Device %d on %s has the Ext bit set. ID is: %d" + " Contact vojtech@ucw.cz\n", i, gameport->phys, (data[i] >> 2) & 7); + cobra->exists &= ~(1 << i); + } + + if (!cobra->exists) { + err = -ENODEV; + goto fail2; + } + + gameport_set_poll_handler(gameport, cobra_poll); + gameport_set_poll_interval(gameport, 20); + + for (i = 0; i < 2; i++) { + if (~(cobra->exists >> i) & 1) + continue; + + cobra->dev[i] = input_dev = input_allocate_device(); + if (!input_dev) { + err = -ENOMEM; + goto fail3; + } + + snprintf(cobra->phys[i], sizeof(cobra->phys[i]), + "%s/input%d", gameport->phys, i); + + input_dev->name = "Creative Labs Blaster GamePad Cobra"; + input_dev->phys = cobra->phys[i]; + input_dev->id.bustype = BUS_GAMEPORT; + input_dev->id.vendor = GAMEPORT_ID_VENDOR_CREATIVE; + input_dev->id.product = 0x0008; + input_dev->id.version = 0x0100; + input_dev->dev.parent = &gameport->dev; + + input_set_drvdata(input_dev, cobra); + + input_dev->open = cobra_open; + input_dev->close = cobra_close; + + input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); + input_set_abs_params(input_dev, ABS_X, -1, 1, 0, 0); + input_set_abs_params(input_dev, ABS_Y, -1, 1, 0, 0); + for (j = 0; cobra_btn[j]; j++) + set_bit(cobra_btn[j], input_dev->keybit); + + err = input_register_device(cobra->dev[i]); + if (err) + goto fail4; + } + + return 0; + + fail4: input_free_device(cobra->dev[i]); + fail3: while (--i >= 0) + if (cobra->dev[i]) + input_unregister_device(cobra->dev[i]); + fail2: gameport_close(gameport); + fail1: gameport_set_drvdata(gameport, NULL); + kfree(cobra); + return err; +} + +static void cobra_disconnect(struct gameport *gameport) +{ + struct cobra *cobra = gameport_get_drvdata(gameport); + int i; + + for (i = 0; i < 2; i++) + if ((cobra->exists >> i) & 1) + input_unregister_device(cobra->dev[i]); + gameport_close(gameport); + gameport_set_drvdata(gameport, NULL); + kfree(cobra); +} + +static struct gameport_driver cobra_drv = { + .driver = { + .name = "cobra", + }, + .description = DRIVER_DESC, + .connect = cobra_connect, + .disconnect = cobra_disconnect, +}; + +module_gameport_driver(cobra_drv); |