/* * Joystick device driver for the input driver suite. * * Copyright (c) 1999-2002 Vojtech Pavlik * Copyright (c) 1999 Colin Van Dyke * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #include <asm/io.h> #include <asm/system.h> #include <linux/delay.h> #include <linux/errno.h> #include <linux/joystick.h> #include <linux/input.h> #include <linux/kernel.h> #include <linux/major.h> #include <linux/slab.h> #include <linux/mm.h> #include <linux/miscdevice.h> #include <linux/module.h> #include <linux/poll.h> #include <linux/init.h> #include <linux/smp_lock.h> #include <linux/device.h> #include <linux/devfs_fs_kernel.h> MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); MODULE_DESCRIPTION("Joystick device interfaces"); MODULE_SUPPORTED_DEVICE("input/js"); MODULE_LICENSE("GPL"); #define JOYDEV_MINOR_BASE 0 #define JOYDEV_MINORS 16 #define JOYDEV_BUFFER_SIZE 64 #define MSECS(t) (1000 * ((t) / HZ) + 1000 * ((t) % HZ) / HZ) struct joydev { int exist; int open; int minor; char name[16]; struct input_handle handle; wait_queue_head_t wait; struct list_head list; struct js_corr corr[ABS_MAX + 1]; struct JS_DATA_SAVE_TYPE glue; int nabs; int nkey; __u16 keymap[KEY_MAX - BTN_MISC + 1]; __u16 keypam[KEY_MAX - BTN_MISC + 1]; __u8 absmap[ABS_MAX + 1]; __u8 abspam[ABS_MAX + 1]; __s16 abs[ABS_MAX + 1]; }; struct joydev_list { struct js_event buffer[JOYDEV_BUFFER_SIZE]; int head; int tail; int startup; struct fasync_struct *fasync; struct joydev *joydev; struct list_head node; }; static struct joydev *joydev_table[JOYDEV_MINORS]; static int joydev_correct(int value, struct js_corr *corr) { switch (corr->type) { case JS_CORR_NONE: break; case JS_CORR_BROKEN: value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 : ((corr->coef[3] * (value - corr->coef[1])) >> 14)) : ((corr->coef[2] * (value - corr->coef[0])) >> 14); break; default: return 0; } if (value < -32767) return -32767; if (value > 32767) return 32767; return value; } static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value) { struct joydev *joydev = handle->private; struct joydev_list *list; struct js_event event; switch (type) { case EV_KEY: if (code < BTN_MISC || value == 2) return; event.type = JS_EVENT_BUTTON; event.number = joydev->keymap[code - BTN_MISC]; event.value = value; break; case EV_ABS: event.type = JS_EVENT_AXIS; event.number = joydev->absmap[code]; event.value = joydev_correct(value, joydev->corr + event.number); if (event.value == joydev->abs[event.number]) return; joydev->abs[event.number] = event.value; break; default: return; } event.time = MSECS(jiffies); list_for_each_entry(list, &joydev->list, node) { memcpy(list->buffer + list->head, &event, sizeof(struct js_event)); if (list->startup == joydev->nabs + joydev->nkey) if (list->tail == (list->head = (list->head + 1) & (JOYDEV_BUFFER_SIZE - 1))) list->startup = 0; kill_fasync(&list->fasync, SIGIO, POLL_IN); } wake_up_interruptible(&joydev->wait); } static int joydev_fasync(int fd, struct file *file, int on) { int retval; struct joydev_list *list = file->private_data; retval = fasync_helper(fd, file, on, &list->fasync); return retval < 0 ? retval : 0; } static void joydev_free(struct joydev *joydev) { joydev_table[joydev->minor] = NULL; kfree(joydev); } static int joydev_release(struct inode * inode, struct file * file) { struct joydev_list *list = file->private_data; joydev_fasync(-1, file, 0); list_del(&list->node); if (!--list->joydev->open) { if (list->joydev->exist) input_close_device(&list->joydev->handle); else joydev_free(list->joydev); } kfree(list); return 0; } static int joydev_open(struct inode *inode, struct file *file) { struct joydev_list *list; int i = iminor(inode) - JOYDEV_MINOR_BASE; if (i >= JOYDEV_MINORS || !joydev_table[i]) return -ENODEV; if (!(list = kmalloc(sizeof(struct joydev_list), GFP_KERNEL))) return -ENOMEM; memset(list, 0, sizeof(struct joydev_list)); list->joydev = joydev_table[i]; list_add_tail(&list->node, &joydev_table[i]->list); file->private_data = list; if (!list->joydev->open++) if (list->joydev->exist) input_open_device(&list->joydev->handle); return 0; } static ssize_t joydev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) { return -EINVAL; } static ssize_t joydev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { struct joydev_list *list = file->private_data; struct joydev *joydev = list->joydev; struct input_dev *input = joydev->handle.dev; int retval = 0; if (!list->joydev->exist) return -ENODEV; if (count < sizeof(struct js_event)) return -EINVAL; if (count == sizeof(struct JS_DATA_TYPE)) { struct JS_DATA_TYPE data; int i; for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++) data.buttons |= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0; data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x; data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y; if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE))) return -EFAULT; list->startup = 0; list->tail = list->head; return sizeof(struct JS_DATA_TYPE); } if (list->startup == joydev->nabs + joydev->nkey && list->head == list->tail && (file->f_flags & O_NONBLOCK)) return -EAGAIN; retval = wait_event_interruptible(list->joydev->wait, !list->joydev->exist || list->startup < joydev->nabs + joydev->nkey || list->head != list->tail); if (retval) return retval; if (!list->joydev->exist) return -ENODEV; while (list->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) { struct js_event event; event.time = MSECS(jiffies); if (list->startup < joydev->nkey) { event.type = JS_EVENT_BUTTON | JS_EVENT_INIT; event.number = list->startup; event.value = !!test_bit(joydev->keypam[event.number], input->key); } else { event.type = JS_EVENT_AXIS | JS_EVENT_INIT; event.number = list->startup - joydev->nkey; event.value = joydev->abs[event.number]; } if (copy_to_user(buf + retval, &event, sizeof(struct js_event))) return -EFAULT; list->startup++; retval += sizeof(struct js_event); } while (list->head != list->tail && retval + sizeof(struct js_event) <= count) { if (copy_to_user(buf + retval, list->buffer + list->tail, sizeof(struct js_event))) return -EFAULT; list->tail = (list->tail + 1) & (JOYDEV_BUFFER_SIZE - 1); retval += sizeof(struct js_event); } return retval; } /* No kernel lock - fine */ static unsigned int joydev_poll(struct file *file, poll_table *wait) { struct joydev_list *list = file->private_data; poll_wait(file, &list->joydev->wait, wait); return ((list->head != list->tail || list->startup < list->joydev->nabs + list->joydev->nkey) ? (POLLIN | POLLRDNORM) : 0) | (list->joydev->exist ? 0 : (POLLHUP | POLLERR)); } static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { struct joydev_list *list = file->private_data; struct joydev *joydev = list->joydev; struct input_dev *dev = joydev->handle.dev; void __user *argp = (void __user *)arg; int i, j; if (!joydev->exist) return -ENODEV; switch (cmd) { case JS_SET_CAL: return copy_from_user(&joydev->glue.JS_CORR, argp, sizeof(struct JS_DATA_TYPE)) ? -EFAULT : 0; case JS_GET_CAL: return copy_to_user(argp, &joydev->glue.JS_CORR, sizeof(struct JS_DATA_TYPE)) ? -EFAULT : 0; case JS_SET_TIMEOUT: return get_user(joydev->glue.JS_TIMEOUT, (int __user *) arg); case JS_GET_TIMEOUT: return put_user(joydev->glue.JS_TIMEOUT, (int __user *) arg); case JS_SET_TIMELIMIT: return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg); case JS_GET_TIMELIMIT: return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg); case JS_SET_ALL: return copy_from_user(&joydev->glue, argp, sizeof(struct JS_DATA_SAVE_TYPE)) ? -EFAULT : 0; case JS_GET_ALL: return copy_to_user(argp, &joydev->glue, sizeof(struct JS_DATA_SAVE_TYPE)) ? -EFAULT : 0; case JSIOCGVERSION: return put_user(JS_VERSION, (__u32 __user *) arg); case JSIOCGAXES: return put_user(joydev->nabs, (__u8 __user *) arg); case JSIOCGBUTTONS: return put_user(joydev->nkey, (__u8 __user *) arg); case JSIOCSCORR: if (copy_from_user(joydev->corr, argp, sizeof(struct js_corr) * joydev->nabs)) return -EFAULT; for (i = 0; i < joydev->nabs; i++) { j = joydev->abspam[i]; joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i); } return 0; case JSIOCGCORR: return copy_to_user(argp, joydev->corr, sizeof(struct js_corr) * joydev->nabs) ? -EFAULT : 0; case JSIOCSAXMAP: if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1))) return -EFAULT; for (i = 0; i < joydev->nabs; i++) { if (joydev->abspam[i] > ABS_MAX) return -EINVAL; joydev->absmap[joydev->abspam[i]] = i; } return 0; case JSIOCGAXMAP: return copy_to_user(argp, joydev->abspam, sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0; case JSIOCSBTNMAP: if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1))) return -EFAULT; for (i = 0; i < joydev->nkey; i++) { if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC) return -EINVAL; joydev->keymap[joydev->keypam[i] - BTN_MISC] = i; } return 0; case JSIOCGBTNMAP: return copy_to_user(argp, joydev->keypam, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0; default: if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) { int len; if (!dev->name) return 0; len = strlen(dev->name) + 1; if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); if (copy_to_user(argp, dev->name, len)) return -EFAULT; return len; } } return -EINVAL; } static struct file_operations joydev_fops = { .owner = THIS_MODULE, .read = joydev_read, .write = joydev_write, .poll = joydev_poll, .open = joydev_open, .release = joydev_release, .ioctl = joydev_ioctl, .fasync = joydev_fasync, }; static struct input_handle *joydev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id) { struct joydev *joydev; int i, j, t, minor; for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++); if (minor == JOYDEV_MINORS) { printk(KERN_ERR "joydev: no more free joydev devices\n"); return NULL; } if (!(joydev = kmalloc(sizeof(struct joydev), GFP_KERNEL))) return NULL; memset(joydev, 0, sizeof(struct joydev)); INIT_LIST_HEAD(&joydev->list); init_waitqueue_head(&joydev->wait); joydev->minor = minor; joydev->exist = 1; joydev->handle.dev = dev; joydev->handle.name = joydev->name; joydev->handle.handler = handler; joydev->handle.private = joydev; sprintf(joydev->name, "js%d", minor); for (i = 0; i < ABS_MAX + 1; i++) if (test_bit(i, dev->absbit)) { joydev->absmap[i] = joydev->nabs; joydev->abspam[joydev->nabs] = i; joydev->nabs++; } for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++) if (test_bit(i + BTN_MISC, dev->keybit)) { joydev->keymap[i] = joydev->nkey; joydev->keypam[joydev->nkey] = i + BTN_MISC; joydev->nkey++; } for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++) if (test_bit(i + BTN_MISC, dev->keybit)) { joydev->keymap[i] = joydev->nkey; joydev->keypam[joydev->nkey] = i + BTN_MISC; joydev->nkey++; } for (i = 0; i < joydev->nabs; i++) { j = joydev->abspam[i]; if (dev->absmax[j] == dev->absmin[j]) { joydev->corr[i].type = JS_CORR_NONE; joydev->abs[i] = dev->abs[j]; continue; } joydev->corr[i].type = JS_CORR_BROKEN; joydev->corr[i].prec = dev->absfuzz[j]; joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j]; joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j]; if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j]))) continue; joydev->corr[i].coef[2] = (1 << 29) / t; joydev->corr[i].coef[3] = (1 << 29) / t; joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i); } joydev_table[minor] = joydev; devfs_mk_cdev(MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor), S_IFCHR|S_IRUGO|S_IWUSR, "input/js%d", minor); class_device_create(input_class, MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor), dev->dev, "js%d", minor); return &joydev->handle; } static void joydev_disconnect(struct input_handle *handle) { struct joydev *joydev = handle->private; struct joydev_list *list; class_device_destroy(input_class, MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + joydev->minor)); devfs_remove("input/js%d", joydev->minor); joydev->exist = 0; if (joydev->open) { input_close_device(handle); wake_up_interruptible(&joydev->wait); list_for_each_entry(list, &joydev->list, node) kill_fasync(&list->fasync, SIGIO, POLL_HUP); } else joydev_free(joydev); } static struct input_device_id joydev_blacklist[] = { { .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT, .evbit = { BIT(EV_KEY) }, .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) }, }, /* Avoid itouchpads, touchscreens and tablets */ { }, /* Terminating entry */ }; static struct input_device_id joydev_ids[] = { { .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, .evbit = { BIT(EV_ABS) }, .absbit = { BIT(ABS_X) }, }, { .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, .evbit = { BIT(EV_ABS) }, .absbit = { BIT(ABS_WHEEL) }, }, { .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, .evbit = { BIT(EV_ABS) }, .absbit = { BIT(ABS_THROTTLE) }, }, { }, /* Terminating entry */ }; MODULE_DEVICE_TABLE(input, joydev_ids); static struct input_handler joydev_handler = { .event = joydev_event, .connect = joydev_connect, .disconnect = joydev_disconnect, .fops = &joydev_fops, .minor = JOYDEV_MINOR_BASE, .name = "joydev", .id_table = joydev_ids, .blacklist = joydev_blacklist, }; static int __init joydev_init(void) { input_register_handler(&joydev_handler); return 0; } static void __exit joydev_exit(void) { input_unregister_handler(&joydev_handler); } module_init(joydev_init); module_exit(joydev_exit);