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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
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#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_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_obj(struct joydev_client); 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_COMPATstatic 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,};
/* * 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 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 USB_VENDOR_ID_NINTENDO 0x057e#define USB_DEVICE_ID_NINTENDO_JOYCONL 0x2006#define USB_DEVICE_ID_NINTENDO_JOYCONR 0x2007#define USB_DEVICE_ID_NINTENDO_PROCON 0x2009#define USB_DEVICE_ID_NINTENDO_CHRGGRIP 0x200E
#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), ACCEL_DEV(USB_VENDOR_ID_NINTENDO, USB_DEVICE_ID_NINTENDO_PROCON), ACCEL_DEV(USB_VENDOR_ID_NINTENDO, USB_DEVICE_ID_NINTENDO_CHRGGRIP), ACCEL_DEV(USB_VENDOR_ID_NINTENDO, USB_DEVICE_ID_NINTENDO_JOYCONL), ACCEL_DEV(USB_VENDOR_ID_NINTENDO, USB_DEVICE_ID_NINTENDO_JOYCONR), { /* 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_obj(struct joydev); 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);