/* * 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/device.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 struct joydev { int exist; int open; int minor; char name[16]; struct input_handle handle; wait_queue_head_t wait; struct list_head client_list; spinlock_t client_lock; /* protects client_list */ struct mutex mutex; struct device dev; 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_client { struct js_event buffer[JOYDEV_BUFFER_SIZE]; int head; int tail; int startup; spinlock_t buffer_lock; /* protects access to buffer, head and tail */ struct fasync_struct *fasync; struct joydev *joydev; struct list_head node; }; static struct joydev *joydev_table[JOYDEV_MINORS]; static DEFINE_MUTEX(joydev_table_mutex); 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; } return value < -32767 ? -32767 : (value > 32767 ? 32767 : value); } static void joydev_pass_event(struct joydev_client *client, struct js_event *event) { struct joydev *joydev = client->joydev; /* * IRQs already disabled, just acquire the lock */ spin_lock(&client->buffer_lock); client->buffer[client->head] = *event; if (client->startup == joydev->nabs + joydev->nkey) { client->head++; client->head &= JOYDEV_BUFFER_SIZE - 1; if (client->tail == client->head) client->startup = 0; } spin_unlock(&client->buffer_lock); kill_fasync(&client->fasync, SIGIO, POLL_IN); } static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value) { struct joydev *joydev = handle->private; struct joydev_client *client; 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 = jiffies_to_msecs(jiffies); rcu_read_lock(); list_for_each_entry_rcu(client, &joydev->client_list, node) joydev_pass_event(client, &event); rcu_read_unlock(); wake_up_interruptible(&joydev->wait); } static int joydev_fasync(int fd, struct file *file, int on) { struct joydev_client *client = file->private_data; return fasync_helper(fd, file, on, &client->fasync); } static void joydev_free(struct device *dev) { struct joydev *joydev = container_of(dev, struct joydev, dev); input_put_device(joydev->handle.dev); kfree(joydev); } static void joydev_attach_client(struct joydev *joydev, struct joydev_client *client) { spin_lock(&joydev->client_lock); list_add_tail_rcu(&client->node, &joydev->client_list); spin_unlock(&joydev->client_lock); synchronize_rcu(); } static void joydev_detach_client(struct joydev *joydev, struct joydev_client *client) { spin_lock(&joydev->client_lock); list_del_rcu(&client->node); spin_unlock(&joydev->client_lock); synchronize_rcu(); } static int joydev_open_device(struct joydev *joydev) { int retval; retval = mutex_lock_interruptible(&joydev->mutex); if (retval) return retval; if (!joydev->exist) retval = -ENODEV; else if (!joydev->open++) { retval = input_open_device(&joydev->handle); if (retval) joydev->open--; } mutex_unlock(&joydev->mutex); return retval; } static void joydev_close_device(struct joydev *joydev) { mutex_lock(&joydev->mutex); if (joydev->exist && !--joydev->open) input_close_device(&joydev->handle); mutex_unlock(&joydev->mutex); } /* * Wake up users waiting for IO so they can disconnect from * dead device. */ static void joydev_hangup(struct joydev *joydev) { struct joydev_client *client; spin_lock(&joydev->client_lock); list_for_each_entry(client, &joydev->client_list, node) kill_fasync(&client->fasync, SIGIO, POLL_HUP); spin_unlock(&joydev->client_lock); wake_up_interruptible(&joydev->wait); } static int joydev_release(struct inode *inode, struct file *file) { struct joydev_client *client = file->private_data; struct joydev *joydev = client->joydev; joydev_detach_client(joydev, client); kfree(client); joydev_close_device(joydev); put_device(&joydev->dev); return 0; } static int joydev_open(struct inode *inode, struct file *file) { struct joydev_client *client; struct joydev *joydev; int i = iminor(inode) - JOYDEV_MINOR_BASE; int error; if (i >= JOYDEV_MINORS) return -ENODEV; error = mutex_lock_interruptible(&joydev_table_mutex); if (error) return error; joydev = joydev_table[i]; if (joydev) get_device(&joydev->dev); mutex_unlock(&joydev_table_mutex); if (!joydev) return -ENODEV; client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL); if (!client) { error = -ENOMEM; goto err_put_joydev; } spin_lock_init(&client->buffer_lock); client->joydev = joydev; joydev_attach_client(joydev, client); error = joydev_open_device(joydev); if (error) goto err_free_client; file->private_data = client; return 0; err_free_client: joydev_detach_client(joydev, client); kfree(client); err_put_joydev: put_device(&joydev->dev); return error; } static int joydev_generate_startup_event(struct joydev_client *client, struct input_dev *input, struct js_event *event) { struct joydev *joydev = client->joydev; int have_event; spin_lock_irq(&client->buffer_lock); have_event = client->startup < joydev->nabs + joydev->nkey; if (have_event) { event->time = jiffies_to_msecs(jiffies); if (client->startup < joydev->nkey) { event->type = JS_EVENT_BUTTON | JS_EVENT_INIT; event->number = client->startup; event->value = !!test_bit(joydev->keypam[event->number], input->key); } else { event->type = JS_EVENT_AXIS | JS_EVENT_INIT; event->number = client->startup - joydev->nkey; event->value = joydev->abs[event->number]; } client->startup++; } spin_unlock_irq(&client->buffer_lock); return have_event; } static int joydev_fetch_next_event(struct joydev_client *client, struct js_event *event) { int have_event; spin_lock_irq(&client->buffer_lock); have_event = client->head != client->tail; if (have_event) { *event = client->buffer[client->tail++]; client->tail &= JOYDEV_BUFFER_SIZE - 1; } spin_unlock_irq(&client->buffer_lock); return have_event; } /* * Old joystick interface */ static ssize_t joydev_0x_read(struct joydev_client *client, struct input_dev *input, char __user *buf) { struct joydev *joydev = client->joydev; struct JS_DATA_TYPE data; int i; spin_lock_irq(&input->event_lock); /* * Get device state */ 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; /* * Reset reader's event queue */ spin_lock(&client->buffer_lock); client->startup = 0; client->tail = client->head; spin_unlock(&client->buffer_lock); spin_unlock_irq(&input->event_lock); if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE))) return -EFAULT; return sizeof(struct JS_DATA_TYPE); } static inline int joydev_data_pending(struct joydev_client *client) { struct joydev *joydev = client->joydev; return client->startup < joydev->nabs + joydev->nkey || client->head != client->tail; } static ssize_t joydev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { struct joydev_client *client = file->private_data; struct joydev *joydev = client->joydev; struct input_dev *input = joydev->handle.dev; struct js_event event; int retval; if (!joydev->exist) return -ENODEV; if (count < sizeof(struct js_event)) return -EINVAL; if (count == sizeof(struct JS_DATA_TYPE)) return joydev_0x_read(client, input, buf); if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK)) return -EAGAIN; retval = wait_event_interruptible(joydev->wait, !joydev->exist || joydev_data_pending(client)); if (retval) return retval; if (!joydev->exist) return -ENODEV; while (retval + sizeof(struct js_event) <= count && joydev_generate_startup_event(client, input, &event)) { if (copy_to_user(buf + retval, &event, sizeof(struct js_event))) return -EFAULT; retval += sizeof(struct js_event); } while (retval + sizeof(struct js_event) <= count && joydev_fetch_next_event(client, &event)) { if (copy_to_user(buf + retval, &event, sizeof(struct js_event))) return -EFAULT; retval += sizeof(struct js_event); } return retval; } /* No kernel lock - fine */ static unsigned int joydev_poll(struct file *file, poll_table *wait) { struct joydev_client *client = file->private_data; struct joydev *joydev = client->joydev; poll_wait(file, &joydev->wait, wait); return (joydev_data_pending(client) ? (POLLIN | POLLRDNORM) : 0) | (joydev->exist ? 0 : (POLLHUP | POLLERR)); } static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __user *argp) { struct input_dev *dev = joydev->handle.dev; int i, j; switch (cmd) { case JS_SET_CAL: return copy_from_user(&joydev->glue.JS_CORR, argp, sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0; case JS_GET_CAL: return copy_to_user(argp, &joydev->glue.JS_CORR, sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0; case JS_SET_TIMEOUT: return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp); case JS_GET_TIMEOUT: return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp); case JSIOCGVERSION: return put_user(JS_VERSION, (__u32 __user *) argp); case JSIOCGAXES: return put_user(joydev->nabs, (__u8 __user *) argp); case JSIOCGBUTTONS: return put_user(joydev->nkey, (__u8 __user *) argp); case JSIOCSCORR: if (copy_from_user(joydev->corr, argp, sizeof(joydev->corr[0]) * 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(joydev->corr[0]) * 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 & ~IOCSIZE_MASK) == 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; } #ifdef CONFIG_COMPAT static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct joydev_client *client = file->private_data; struct joydev *joydev = client->joydev; void __user *argp = (void __user *)arg; s32 tmp32; struct JS_DATA_SAVE_TYPE_32 ds32; int retval; retval = mutex_lock_interruptible(&joydev->mutex); if (retval) return retval; if (!joydev->exist) { retval = -ENODEV; goto out; } switch (cmd) { case JS_SET_TIMELIMIT: retval = get_user(tmp32, (s32 __user *) arg); if (retval == 0) joydev->glue.JS_TIMELIMIT = tmp32; break; case JS_GET_TIMELIMIT: tmp32 = joydev->glue.JS_TIMELIMIT; retval = put_user(tmp32, (s32 __user *) arg); break; case JS_SET_ALL: retval = copy_from_user(&ds32, argp, sizeof(ds32)) ? -EFAULT : 0; if (retval == 0) { joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT; joydev->glue.BUSY = ds32.BUSY; joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME; joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT; joydev->glue.JS_SAVE = ds32.JS_SAVE; joydev->glue.JS_CORR = ds32.JS_CORR; } break; case JS_GET_ALL: ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT; ds32.BUSY = joydev->glue.BUSY; ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME; ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT; ds32.JS_SAVE = joydev->glue.JS_SAVE; ds32.JS_CORR = joydev->glue.JS_CORR; retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0; break; default: retval = joydev_ioctl_common(joydev, cmd, argp); break; } out: mutex_unlock(&joydev->mutex); return retval; } #endif /* CONFIG_COMPAT */ static long joydev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct joydev_client *client = file->private_data; struct joydev *joydev = client->joydev; void __user *argp = (void __user *)arg; int retval; retval = mutex_lock_interruptible(&joydev->mutex); if (retval) return retval; if (!joydev->exist) { retval = -ENODEV; goto out; } switch (cmd) { case JS_SET_TIMELIMIT: retval = get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg); break; case JS_GET_TIMELIMIT: retval = put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg); break; case JS_SET_ALL: retval = copy_from_user(&joydev->glue, argp, sizeof(joydev->glue)) ? -EFAULT: 0; break; case JS_GET_ALL: retval = copy_to_user(argp, &joydev->glue, sizeof(joydev->glue)) ? -EFAULT : 0; break; default: retval = joydev_ioctl_common(joydev, cmd, argp); break; } out: mutex_unlock(&joydev->mutex); return retval; } static const struct file_operations joydev_fops = { .owner = THIS_MODULE, .read = joydev_read, .poll = joydev_poll, .open = joydev_open, .release = joydev_release, .unlocked_ioctl = joydev_ioctl, #ifdef CONFIG_COMPAT .compat_ioctl = joydev_compat_ioctl, #endif .fasync = joydev_fasync, }; static int joydev_install_chrdev(struct joydev *joydev) { joydev_table[joydev->minor] = joydev; return 0; } static void joydev_remove_chrdev(struct joydev *joydev) { mutex_lock(&joydev_table_mutex); joydev_table[joydev->minor] = NULL; mutex_unlock(&joydev_table_mutex); } /* * Mark device non-existant. This disables writes, ioctls and * prevents new users from opening the device. Already posted * blocking reads will stay, however new ones will fail. */ static void joydev_mark_dead(struct joydev *joydev) { mutex_lock(&joydev->mutex); joydev->exist = 0; mutex_unlock(&joydev->mutex); } static void joydev_cleanup(struct joydev *joydev) { struct input_handle *handle = &joydev->handle; joydev_mark_dead(joydev); joydev_hangup(joydev); joydev_remove_chrdev(joydev); /* joydev is marked dead so noone else accesses joydev->open */ if (joydev->open) input_close_device(handle); } static int joydev_connect(struct input_handler *handler, struct input_dev *dev, const struct input_device_id *id) { struct joydev *joydev; int i, j, t, minor; int error; for (minor = 0; minor < JOYDEV_MINORS; minor++) if (!joydev_table[minor]) break; if (minor == JOYDEV_MINORS) { printk(KERN_ERR "joydev: no more free joydev devices\n"); return -ENFILE; } joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL); if (!joydev) return -ENOMEM; INIT_LIST_HEAD(&joydev->client_list); spin_lock_init(&joydev->client_lock); mutex_init(&joydev->mutex); init_waitqueue_head(&joydev->wait); snprintf(joydev->name, sizeof(joydev->name), "js%d", minor); joydev->exist = 1; joydev->minor = minor; joydev->exist = 1; joydev->handle.dev = input_get_device(dev); joydev->handle.name = joydev->name; joydev->handle.handler = handler; joydev->handle.private = joydev; 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]; t = (dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j]; if (t) { 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); } } dev_set_name(&joydev->dev, joydev->name); joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor); joydev->dev.class = &input_class; joydev->dev.parent = &dev->dev; joydev->dev.release = joydev_free; device_initialize(&joydev->dev); error = input_register_handle(&joydev->handle); if (error) goto err_free_joydev; error = joydev_install_chrdev(joydev); if (error) goto err_unregister_handle; error = device_add(&joydev->dev); if (error) goto err_cleanup_joydev; return 0; err_cleanup_joydev: joydev_cleanup(joydev); err_unregister_handle: input_unregister_handle(&joydev->handle); err_free_joydev: put_device(&joydev->dev); return error; } static void joydev_disconnect(struct input_handle *handle) { struct joydev *joydev = handle->private; device_del(&joydev->dev); joydev_cleanup(joydev); input_unregister_handle(handle); put_device(&joydev->dev); } static const struct input_device_id joydev_blacklist[] = { { .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT, .evbit = { BIT_MASK(EV_KEY) }, .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) }, }, /* Avoid itouchpads, touchscreens and tablets */ { } /* Terminating entry */ }; static const struct input_device_id joydev_ids[] = { { .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, .evbit = { BIT_MASK(EV_ABS) }, .absbit = { BIT_MASK(ABS_X) }, }, { .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, .evbit = { BIT_MASK(EV_ABS) }, .absbit = { BIT_MASK(ABS_WHEEL) }, }, { .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, .evbit = { BIT_MASK(EV_ABS) }, .absbit = { BIT_MASK(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) { return input_register_handler(&joydev_handler); } static void __exit joydev_exit(void) { input_unregister_handler(&joydev_handler); } module_init(joydev_init); module_exit(joydev_exit);