diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/input/joydev.c | 1089 |
1 files changed, 1089 insertions, 0 deletions
diff --git a/drivers/input/joydev.c b/drivers/input/joydev.c new file mode 100644 index 000000000..675fcd095 --- /dev/null +++ b/drivers/input/joydev.c @@ -0,0 +1,1089 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Joystick device driver for the input driver suite. + * + * Copyright (c) 1999-2002 Vojtech Pavlik + * Copyright (c) 1999 Colin Van Dyke + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <asm/io.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/sched.h> +#include <linux/slab.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/poll.h> +#include <linux/init.h> +#include <linux/device.h> +#include <linux/cdev.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 open; + 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 cdev cdev; + bool exist; + + struct js_corr corr[ABS_CNT]; + 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_CNT]; + __u8 abspam[ABS_CNT]; + __s16 abs[ABS_CNT]; +}; + +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 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 clamp(value, -32767, 32767); +} + +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); +} + +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 void joydev_refresh_state(struct joydev *joydev) +{ + struct input_dev *dev = joydev->handle.dev; + int i, val; + + for (i = 0; i < joydev->nabs; i++) { + val = input_abs_get_val(dev, joydev->abspam[i]); + joydev->abs[i] = joydev_correct(val, &joydev->corr[i]); + } +} + +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--; + else + joydev_refresh_state(joydev); + } + + 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); + + return 0; +} + +static int joydev_open(struct inode *inode, struct file *file) +{ + struct joydev *joydev = + container_of(inode->i_cdev, struct joydev, cdev); + struct joydev_client *client; + int error; + + client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL); + if (!client) + return -ENOMEM; + + 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; + stream_open(inode, file); + + return 0; + + err_free_client: + joydev_detach_client(joydev, client); + kfree(client); + 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 __poll_t 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) ? (EPOLLIN | EPOLLRDNORM) : 0) | + (joydev->exist ? 0 : (EPOLLHUP | EPOLLERR)); +} + +static int joydev_handle_JSIOCSAXMAP(struct joydev *joydev, + void __user *argp, size_t len) +{ + __u8 *abspam; + int i; + int retval = 0; + + len = min(len, sizeof(joydev->abspam)); + + /* Validate the map. */ + abspam = memdup_user(argp, len); + if (IS_ERR(abspam)) + return PTR_ERR(abspam); + + for (i = 0; i < len && i < joydev->nabs; i++) { + if (abspam[i] > ABS_MAX) { + retval = -EINVAL; + goto out; + } + } + + memcpy(joydev->abspam, abspam, len); + + for (i = 0; i < joydev->nabs; i++) + joydev->absmap[joydev->abspam[i]] = i; + + out: + kfree(abspam); + return retval; +} + +static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev, + void __user *argp, size_t len) +{ + __u16 *keypam; + int i; + int retval = 0; + + if (len % sizeof(*keypam)) + return -EINVAL; + + len = min(len, sizeof(joydev->keypam)); + + /* Validate the map. */ + keypam = memdup_user(argp, len); + if (IS_ERR(keypam)) + return PTR_ERR(keypam); + + for (i = 0; i < (len / 2) && i < joydev->nkey; i++) { + if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) { + retval = -EINVAL; + goto out; + } + } + + memcpy(joydev->keypam, keypam, len); + + for (i = 0; i < joydev->nkey; i++) + joydev->keymap[joydev->keypam[i] - BTN_MISC] = i; + + out: + kfree(keypam); + return retval; +} + + +static int joydev_ioctl_common(struct joydev *joydev, + unsigned int cmd, void __user *argp) +{ + struct input_dev *dev = joydev->handle.dev; + size_t len; + int i; + const char *name; + + /* Process fixed-sized commands. */ + 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++) { + int val = input_abs_get_val(dev, joydev->abspam[i]); + joydev->abs[i] = joydev_correct(val, &joydev->corr[i]); + } + return 0; + + case JSIOCGCORR: + return copy_to_user(argp, joydev->corr, + sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0; + + } + + /* + * Process variable-sized commands (the axis and button map commands + * are considered variable-sized to decouple them from the values of + * ABS_MAX and KEY_MAX). + */ + switch (cmd & ~IOCSIZE_MASK) { + + case (JSIOCSAXMAP & ~IOCSIZE_MASK): + return joydev_handle_JSIOCSAXMAP(joydev, argp, _IOC_SIZE(cmd)); + + case (JSIOCGAXMAP & ~IOCSIZE_MASK): + len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam)); + return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len; + + case (JSIOCSBTNMAP & ~IOCSIZE_MASK): + return joydev_handle_JSIOCSBTNMAP(joydev, argp, _IOC_SIZE(cmd)); + + case (JSIOCGBTNMAP & ~IOCSIZE_MASK): + len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam)); + return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len; + + case JSIOCGNAME(0): + name = dev->name; + if (!name) + return 0; + + len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1); + return copy_to_user(argp, name, len) ? -EFAULT : 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, + .llseek = no_llseek, +}; + +/* + * Mark device non-existent. 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 = false; + 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 is marked dead so no one else accesses joydev->open */ + if (joydev->open) + input_close_device(handle); +} + +/* + * These codes are copied from from hid-ids.h, unfortunately there is no common + * usb_ids/bt_ids.h header. + */ +#define USB_VENDOR_ID_SONY 0x054c +#define USB_DEVICE_ID_SONY_PS3_CONTROLLER 0x0268 +#define USB_DEVICE_ID_SONY_PS4_CONTROLLER 0x05c4 +#define USB_DEVICE_ID_SONY_PS4_CONTROLLER_2 0x09cc +#define USB_DEVICE_ID_SONY_PS4_CONTROLLER_DONGLE 0x0ba0 + +#define USB_VENDOR_ID_THQ 0x20d6 +#define USB_DEVICE_ID_THQ_PS3_UDRAW 0xcb17 + +#define ACCEL_DEV(vnd, prd) \ + { \ + .flags = INPUT_DEVICE_ID_MATCH_VENDOR | \ + INPUT_DEVICE_ID_MATCH_PRODUCT | \ + INPUT_DEVICE_ID_MATCH_PROPBIT, \ + .vendor = (vnd), \ + .product = (prd), \ + .propbit = { BIT_MASK(INPUT_PROP_ACCELEROMETER) }, \ + } + +static const struct input_device_id joydev_blacklist[] = { + /* Avoid touchpads and touchscreens */ + { + .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 tablets, digitisers and similar devices */ + { + .flags = INPUT_DEVICE_ID_MATCH_EVBIT | + INPUT_DEVICE_ID_MATCH_KEYBIT, + .evbit = { BIT_MASK(EV_KEY) }, + .keybit = { [BIT_WORD(BTN_DIGI)] = BIT_MASK(BTN_DIGI) }, + }, + /* Disable accelerometers on composite devices */ + ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS3_CONTROLLER), + ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS4_CONTROLLER), + ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS4_CONTROLLER_2), + ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS4_CONTROLLER_DONGLE), + ACCEL_DEV(USB_VENDOR_ID_THQ, USB_DEVICE_ID_THQ_PS3_UDRAW), + { /* sentinel */ } +}; + +static bool joydev_dev_is_blacklisted(struct input_dev *dev) +{ + const struct input_device_id *id; + + for (id = joydev_blacklist; id->flags; id++) { + if (input_match_device_id(dev, id)) { + dev_dbg(&dev->dev, + "joydev: blacklisting '%s'\n", dev->name); + return true; + } + } + + return false; +} + +static bool joydev_dev_is_absolute_mouse(struct input_dev *dev) +{ + DECLARE_BITMAP(jd_scratch, KEY_CNT); + bool ev_match = false; + + BUILD_BUG_ON(ABS_CNT > KEY_CNT || EV_CNT > KEY_CNT); + + /* + * Virtualization (VMware, etc) and remote management (HP + * ILO2) solutions use absolute coordinates for their virtual + * pointing devices so that there is one-to-one relationship + * between pointer position on the host screen and virtual + * guest screen, and so their mice use ABS_X, ABS_Y and 3 + * primary button events. This clashes with what joydev + * considers to be joysticks (a device with at minimum ABS_X + * axis). + * + * Here we are trying to separate absolute mice from + * joysticks. A device is, for joystick detection purposes, + * considered to be an absolute mouse if the following is + * true: + * + * 1) Event types are exactly + * EV_ABS, EV_KEY and EV_SYN + * or + * EV_ABS, EV_KEY, EV_SYN and EV_MSC + * or + * EV_ABS, EV_KEY, EV_SYN, EV_MSC and EV_REL. + * 2) Absolute events are exactly ABS_X and ABS_Y. + * 3) Keys are exactly BTN_LEFT, BTN_RIGHT and BTN_MIDDLE. + * 4) Device is not on "Amiga" bus. + */ + + bitmap_zero(jd_scratch, EV_CNT); + /* VMware VMMouse, HP ILO2 */ + __set_bit(EV_ABS, jd_scratch); + __set_bit(EV_KEY, jd_scratch); + __set_bit(EV_SYN, jd_scratch); + if (bitmap_equal(jd_scratch, dev->evbit, EV_CNT)) + ev_match = true; + + /* HP ILO2, AMI BMC firmware */ + __set_bit(EV_MSC, jd_scratch); + if (bitmap_equal(jd_scratch, dev->evbit, EV_CNT)) + ev_match = true; + + /* VMware Virtual USB Mouse, QEMU USB Tablet, ATEN BMC firmware */ + __set_bit(EV_REL, jd_scratch); + if (bitmap_equal(jd_scratch, dev->evbit, EV_CNT)) + ev_match = true; + + if (!ev_match) + return false; + + bitmap_zero(jd_scratch, ABS_CNT); + __set_bit(ABS_X, jd_scratch); + __set_bit(ABS_Y, jd_scratch); + if (!bitmap_equal(dev->absbit, jd_scratch, ABS_CNT)) + return false; + + bitmap_zero(jd_scratch, KEY_CNT); + __set_bit(BTN_LEFT, jd_scratch); + __set_bit(BTN_RIGHT, jd_scratch); + __set_bit(BTN_MIDDLE, jd_scratch); + + if (!bitmap_equal(dev->keybit, jd_scratch, KEY_CNT)) + return false; + + /* + * Amiga joystick (amijoy) historically uses left/middle/right + * button events. + */ + if (dev->id.bustype == BUS_AMIGA) + return false; + + return true; +} + +static bool joydev_match(struct input_handler *handler, struct input_dev *dev) +{ + /* Disable blacklisted devices */ + if (joydev_dev_is_blacklisted(dev)) + return false; + + /* Avoid absolute mice */ + if (joydev_dev_is_absolute_mouse(dev)) + return false; + + return true; +} + +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, dev_no; + int error; + + minor = input_get_new_minor(JOYDEV_MINOR_BASE, JOYDEV_MINORS, true); + if (minor < 0) { + error = minor; + pr_err("failed to reserve new minor: %d\n", error); + return error; + } + + joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL); + if (!joydev) { + error = -ENOMEM; + goto err_free_minor; + } + + INIT_LIST_HEAD(&joydev->client_list); + spin_lock_init(&joydev->client_lock); + mutex_init(&joydev->mutex); + init_waitqueue_head(&joydev->wait); + joydev->exist = true; + + dev_no = minor; + /* Normalize device number if it falls into legacy range */ + if (dev_no < JOYDEV_MINOR_BASE + JOYDEV_MINORS) + dev_no -= JOYDEV_MINOR_BASE; + dev_set_name(&joydev->dev, "js%d", dev_no); + + joydev->handle.dev = input_get_device(dev); + joydev->handle.name = dev_name(&joydev->dev); + joydev->handle.handler = handler; + joydev->handle.private = joydev; + + for_each_set_bit(i, dev->absbit, ABS_CNT) { + 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 (input_abs_get_max(dev, j) == input_abs_get_min(dev, j)) { + joydev->corr[i].type = JS_CORR_NONE; + continue; + } + joydev->corr[i].type = JS_CORR_BROKEN; + joydev->corr[i].prec = input_abs_get_fuzz(dev, j); + + t = (input_abs_get_max(dev, j) + input_abs_get_min(dev, j)) / 2; + joydev->corr[i].coef[0] = t - input_abs_get_flat(dev, j); + joydev->corr[i].coef[1] = t + input_abs_get_flat(dev, j); + + t = (input_abs_get_max(dev, j) - input_abs_get_min(dev, j)) / 2 + - 2 * input_abs_get_flat(dev, j); + if (t) { + joydev->corr[i].coef[2] = (1 << 29) / t; + joydev->corr[i].coef[3] = (1 << 29) / t; + } + } + + joydev->dev.devt = MKDEV(INPUT_MAJOR, 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; + + cdev_init(&joydev->cdev, &joydev_fops); + + error = cdev_device_add(&joydev->cdev, &joydev->dev); + if (error) + goto err_cleanup_joydev; + + return 0; + + err_cleanup_joydev: + joydev_cleanup(joydev); + input_unregister_handle(&joydev->handle); + err_free_joydev: + put_device(&joydev->dev); + err_free_minor: + input_free_minor(minor); + return error; +} + +static void joydev_disconnect(struct input_handle *handle) +{ + struct joydev *joydev = handle->private; + + cdev_device_del(&joydev->cdev, &joydev->dev); + joydev_cleanup(joydev); + input_free_minor(MINOR(joydev->dev.devt)); + input_unregister_handle(handle); + put_device(&joydev->dev); +} + +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_Z) }, + }, + { + .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) }, + }, + { + .flags = INPUT_DEVICE_ID_MATCH_EVBIT | + INPUT_DEVICE_ID_MATCH_KEYBIT, + .evbit = { BIT_MASK(EV_KEY) }, + .keybit = {[BIT_WORD(BTN_JOYSTICK)] = BIT_MASK(BTN_JOYSTICK) }, + }, + { + .flags = INPUT_DEVICE_ID_MATCH_EVBIT | + INPUT_DEVICE_ID_MATCH_KEYBIT, + .evbit = { BIT_MASK(EV_KEY) }, + .keybit = { [BIT_WORD(BTN_GAMEPAD)] = BIT_MASK(BTN_GAMEPAD) }, + }, + { + .flags = INPUT_DEVICE_ID_MATCH_EVBIT | + INPUT_DEVICE_ID_MATCH_KEYBIT, + .evbit = { BIT_MASK(EV_KEY) }, + .keybit = { [BIT_WORD(BTN_TRIGGER_HAPPY)] = BIT_MASK(BTN_TRIGGER_HAPPY) }, + }, + { } /* Terminating entry */ +}; + +MODULE_DEVICE_TABLE(input, joydev_ids); + +static struct input_handler joydev_handler = { + .event = joydev_event, + .match = joydev_match, + .connect = joydev_connect, + .disconnect = joydev_disconnect, + .legacy_minors = true, + .minor = JOYDEV_MINOR_BASE, + .name = "joydev", + .id_table = joydev_ids, +}; + +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); |