| /* |
| * 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 |
| |
| 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 = jiffies_to_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 = jiffies_to_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_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 & ~(_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; |
| } |
| |
| #ifdef CONFIG_COMPAT |
| static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| { |
| struct joydev_list *list = file->private_data; |
| struct joydev *joydev = list->joydev; |
| void __user *argp = (void __user *)arg; |
| s32 tmp32; |
| struct JS_DATA_SAVE_TYPE_32 ds32; |
| int err; |
| |
| if (!joydev->exist) return -ENODEV; |
| switch(cmd) { |
| case JS_SET_TIMELIMIT: |
| err = get_user(tmp32, (s32 __user *) arg); |
| if (err == 0) |
| joydev->glue.JS_TIMELIMIT = tmp32; |
| break; |
| case JS_GET_TIMELIMIT: |
| tmp32 = joydev->glue.JS_TIMELIMIT; |
| err = put_user(tmp32, (s32 __user *) arg); |
| break; |
| |
| case JS_SET_ALL: |
| err = copy_from_user(&ds32, argp, |
| sizeof(ds32)) ? -EFAULT : 0; |
| if (err == 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; |
| |
| err = copy_to_user(argp, &ds32, |
| sizeof(ds32)) ? -EFAULT : 0; |
| break; |
| |
| default: |
| err = joydev_ioctl_common(joydev, cmd, argp); |
| } |
| return err; |
| } |
| #endif /* CONFIG_COMPAT */ |
| |
| 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; |
| void __user *argp = (void __user *)arg; |
| |
| if (!joydev->exist) return -ENODEV; |
| |
| switch(cmd) { |
| 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(joydev->glue)) ? -EFAULT : 0; |
| case JS_GET_ALL: |
| return copy_to_user(argp, &joydev->glue, |
| sizeof(joydev->glue)) ? -EFAULT : 0; |
| default: |
| return joydev_ioctl_common(joydev, cmd, argp); |
| } |
| } |
| |
| 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, |
| #ifdef CONFIG_COMPAT |
| .compat_ioctl = joydev_compat_ioctl, |
| #endif |
| .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, NULL, |
| 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); |