diff options
Diffstat (limited to 'drivers/hid')
| -rw-r--r-- | drivers/hid/Kconfig | 23 | ||||
| -rw-r--r-- | drivers/hid/Makefile | 1 | ||||
| -rw-r--r-- | drivers/hid/hid-core.c | 3 | ||||
| -rw-r--r-- | drivers/hid/hid-debug.c | 5 | ||||
| -rw-r--r-- | drivers/hid/hid-ids.h | 2 | ||||
| -rw-r--r-- | drivers/hid/hid-input.c | 7 | ||||
| -rw-r--r-- | drivers/hid/hid-magicmouse.c | 13 | ||||
| -rw-r--r-- | drivers/hid/hid-multitouch.c | 10 | ||||
| -rw-r--r-- | drivers/hid/hid-samsung.c | 59 | ||||
| -rw-r--r-- | drivers/hid/uhid.c | 572 |
10 files changed, 687 insertions, 8 deletions
diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig index 7e0acf4..397fc02 100644 --- a/drivers/hid/Kconfig +++ b/drivers/hid/Kconfig @@ -50,6 +50,27 @@ config HIDRAW If unsure, say Y. +config UHID + tristate "User-space I/O driver support for HID subsystem" + depends on HID + default n + ---help--- + Say Y here if you want to provide HID I/O Drivers from user-space. + This allows to write I/O drivers in user-space and feed the data from + the device into the kernel. The kernel parses the HID reports, loads the + corresponding HID Device Driver or provides input devices on top of your + user-space device. + + This driver cannot be used to parse HID-reports in user-space and write + special HID-drivers. You should use hidraw for that. + Instead, this driver allows to write the transport-layer driver in + user-space like USB-HID and Bluetooth-HID do in kernel-space. + + If unsure, say N. + + To compile this driver as a module, choose M here: the + module will be called uhid. + source "drivers/hid/usbhid/Kconfig" menu "Special HID drivers" @@ -486,7 +507,7 @@ config HID_ROCCAT_PYRA config HID_SAMSUNG tristate "Samsung InfraRed remote control or keyboards" - depends on USB_HID + depends on (USB_HID || BT_HIDP) ---help--- Support for Samsung InfraRed remote control or keyboards. diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile index f8cc4ea..5a255e0 100644 --- a/drivers/hid/Makefile +++ b/drivers/hid/Makefile @@ -8,6 +8,7 @@ ifdef CONFIG_DEBUG_FS endif obj-$(CONFIG_HID) += hid.o +obj-$(CONFIG_UHID) += uhid.o hid-$(CONFIG_HIDRAW) += hidraw.o diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index 8fa2cd7..8f8728b 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -1332,9 +1332,11 @@ int hid_connect(struct hid_device *hdev, unsigned int connect_mask) hid_warn(hdev, "can't create sysfs report descriptor attribute err: %d\n", ret); + /* [Security Log] hid_info(hdev, "%s: %s HID v%x.%02x %s [%s] on %s\n", buf, bus, hdev->version >> 8, hdev->version & 0xff, type, hdev->name, hdev->phys); + */ return 0; } @@ -1549,6 +1551,7 @@ static const struct hid_device_id hid_have_special_driver[] = { { HID_USB_DEVICE(USB_VENDOR_ID_ROCCAT, USB_DEVICE_ID_ROCCAT_PYRA_WIRELESS) }, { HID_USB_DEVICE(USB_VENDOR_ID_SAMSUNG, USB_DEVICE_ID_SAMSUNG_IR_REMOTE) }, { HID_USB_DEVICE(USB_VENDOR_ID_SAMSUNG, USB_DEVICE_ID_SAMSUNG_WIRELESS_KBD_MOUSE) }, + { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_SAMSUNG_ELECTRONICS, USB_DEVICE_ID_SAMSUNG_WIRELESS_KBD) }, { HID_USB_DEVICE(USB_VENDOR_ID_SKYCABLE, USB_DEVICE_ID_SKYCABLE_WIRELESS_PRESENTER) }, { HID_USB_DEVICE(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS3_CONTROLLER) }, { HID_USB_DEVICE(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_NAVIGATION_CONTROLLER) }, diff --git a/drivers/hid/hid-debug.c b/drivers/hid/hid-debug.c index bae4874..9a243ca 100644 --- a/drivers/hid/hid-debug.c +++ b/drivers/hid/hid-debug.c @@ -450,6 +450,11 @@ void hid_dump_field(struct hid_field *field, int n, struct seq_file *f) { seq_printf(f, "Logical("); hid_resolv_usage(field->logical, f); seq_printf(f, ")\n"); } + if (field->application) { + tab(n, f); + seq_printf(f, "Application("); + hid_resolv_usage(field->application, f); seq_printf(f, ")\n"); + } tab(n, f); seq_printf(f, "Usage(%d)\n", field->maxusage); for (j = 0; j < field->maxusage; j++) { tab(n+2, f); hid_resolv_usage(field->usage[j].hid, f); seq_printf(f, "\n"); diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h index 08cc68b..4886aea 100644 --- a/drivers/hid/hid-ids.h +++ b/drivers/hid/hid-ids.h @@ -590,7 +590,9 @@ #define USB_DEVICE_ID_SAITEK_RUMBLEPAD 0xff17 #define USB_VENDOR_ID_SAMSUNG 0x0419 +#define USB_VENDOR_ID_SAMSUNG_ELECTRONICS 0x04e8 #define USB_DEVICE_ID_SAMSUNG_IR_REMOTE 0x0001 +#define USB_DEVICE_ID_SAMSUNG_WIRELESS_KBD 0x7021 #define USB_DEVICE_ID_SAMSUNG_WIRELESS_KBD_MOUSE 0x0600 #define USB_VENDOR_ID_SIGMA_MICRO 0x1c4f diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c index 6559e2e..1483c82 100644 --- a/drivers/hid/hid-input.c +++ b/drivers/hid/hid-input.c @@ -971,6 +971,9 @@ int hidinput_connect(struct hid_device *hid, unsigned int force) * UGCI) cram a lot of unrelated inputs into the * same interface. */ hidinput->report = report; + if (hid->driver->input_register && + hid->driver->input_register(hid, hidinput)) + goto out_cleanup; if (input_register_device(hidinput->input)) goto out_cleanup; hidinput = NULL; @@ -978,6 +981,10 @@ int hidinput_connect(struct hid_device *hid, unsigned int force) } } + if (hidinput && hid->driver->input_register && + hid->driver->input_register(hid, hidinput)) + goto out_cleanup; + if (hidinput && input_register_device(hidinput->input)) goto out_cleanup; diff --git a/drivers/hid/hid-magicmouse.c b/drivers/hid/hid-magicmouse.c index 56d0539..c696f7f 100644 --- a/drivers/hid/hid-magicmouse.c +++ b/drivers/hid/hid-magicmouse.c @@ -365,8 +365,10 @@ static int magicmouse_raw_event(struct hid_device *hdev, return 1; } -static void magicmouse_setup_input(struct input_dev *input, struct hid_device *hdev) +static int magicmouse_setup_input(struct hid_device *hdev, struct hid_input *hi) { + struct input_dev *input = hi->input; + __set_bit(EV_KEY, input->evbit); if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE) { @@ -426,6 +428,8 @@ static void magicmouse_setup_input(struct input_dev *input, struct hid_device *h __set_bit(EV_MSC, input->evbit); __set_bit(MSC_RAW, input->mscbit); } + + return 0; } static int magicmouse_input_mapping(struct hid_device *hdev, @@ -478,12 +482,6 @@ static int magicmouse_probe(struct hid_device *hdev, goto err_free; } - /* We do this after hid-input is done parsing reports so that - * hid-input uses the most natural button and axis IDs. - */ - if (msc->input) - magicmouse_setup_input(msc->input, hdev); - if (id->product == USB_DEVICE_ID_APPLE_MAGICMOUSE) report = hid_register_report(hdev, HID_INPUT_REPORT, MOUSE_REPORT_ID); @@ -548,6 +546,7 @@ static struct hid_driver magicmouse_driver = { .remove = magicmouse_remove, .raw_event = magicmouse_raw_event, .input_mapping = magicmouse_input_mapping, + .input_register = magicmouse_setup_input, }; static int __init magicmouse_init(void) diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c index 1308703..91319f9 100644 --- a/drivers/hid/hid-multitouch.c +++ b/drivers/hid/hid-multitouch.c @@ -213,6 +213,16 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi, struct mt_class *cls = td->mtclass; __s32 quirks = cls->quirks; + /* Only map fields from TouchScreen or TouchPad collections. + * We need to ignore fields that belong to other collections + * such as Mouse that might have the same GenericDesktop usages. */ + if (field->application == HID_DG_TOUCHSCREEN) + set_bit(INPUT_PROP_DIRECT, hi->input->propbit); + else if (field->application == HID_DG_TOUCHPAD) + set_bit(INPUT_PROP_POINTER, hi->input->propbit); + else + return 0; + switch (usage->hid & HID_USAGE_PAGE) { case HID_UP_GENDESK: diff --git a/drivers/hid/hid-samsung.c b/drivers/hid/hid-samsung.c index 3c1fd8a..3d19fd4 100644 --- a/drivers/hid/hid-samsung.c +++ b/drivers/hid/hid-samsung.c @@ -131,6 +131,61 @@ static int samsung_kbd_mouse_input_mapping(struct hid_device *hdev, return 1; } +static int samsung_kbd_input_mapping(struct hid_device *hdev, + struct hid_input *hi, struct hid_field *field, struct hid_usage *usage, + unsigned long **bit, int *max) +{ + if (!(HID_UP_CONSUMER == (usage->hid & HID_USAGE_PAGE) || + HID_UP_KEYBOARD == (usage->hid & HID_USAGE_PAGE))) + return 0; + + dbg_hid("samsung wireless keyboard input mapping event [0x%x]\n", + usage->hid & HID_USAGE); + + if (HID_UP_KEYBOARD == (usage->hid & HID_USAGE_PAGE)) { + switch (usage->hid & HID_USAGE) { + set_bit(EV_REP, hi->input->evbit); + /* Only for UK keyboard */ + /* key found */ + case 0x32: samsung_kbd_mouse_map_key_clear(KEY_KBDILLUMTOGGLE); break; + case 0x64: samsung_kbd_mouse_map_key_clear(KEY_BACKSLASH); break; + default: + return 0; + } + } + + if (HID_UP_CONSUMER == (usage->hid & HID_USAGE_PAGE)) { + switch (usage->hid & HID_USAGE) { + /* report 2 */ + /* MENU */ + case 0x040: samsung_kbd_mouse_map_key_clear(KEY_MENU); break; + case 0x18a: samsung_kbd_mouse_map_key_clear(KEY_MAIL); break; + case 0x196: samsung_kbd_mouse_map_key_clear(KEY_WWW); break; + case 0x19e: samsung_kbd_mouse_map_key_clear(KEY_SCREENLOCK); break; + case 0x221: samsung_kbd_mouse_map_key_clear(KEY_SEARCH); break; + case 0x223: samsung_kbd_mouse_map_key_clear(KEY_HOMEPAGE); break; + /* RECENTAPPS */ + case 0x301: samsung_kbd_mouse_map_key_clear(BTN_TRIGGER_HAPPY1); break; + /* APPLICATION */ + case 0x302: samsung_kbd_mouse_map_key_clear(BTN_TRIGGER_HAPPY2); break; + /* Voice search */ + case 0x305: samsung_kbd_mouse_map_key_clear(BTN_TRIGGER_HAPPY4); break; + /* QPANEL on/off */ + case 0x306: samsung_kbd_mouse_map_key_clear(BTN_TRIGGER_HAPPY5); break; + /* SIP on/off */ + case 0x307: samsung_kbd_mouse_map_key_clear(BTN_TRIGGER_HAPPY3); break; + /* LANG */ + case 0x308: samsung_kbd_mouse_map_key_clear(KEY_LANGUAGE); break; + case 0x30a: samsung_kbd_mouse_map_key_clear(KEY_BRIGHTNESSDOWN); break; + case 0x30b: samsung_kbd_mouse_map_key_clear(KEY_BRIGHTNESSUP); break; + default: + return 0; + } + } + + return 1; +} + static __u8 *samsung_report_fixup(struct hid_device *hdev, __u8 *rdesc, unsigned int *rsize) { @@ -148,6 +203,9 @@ static int samsung_input_mapping(struct hid_device *hdev, struct hid_input *hi, if (USB_DEVICE_ID_SAMSUNG_WIRELESS_KBD_MOUSE == hdev->product) ret = samsung_kbd_mouse_input_mapping(hdev, hi, field, usage, bit, max); + else if (USB_DEVICE_ID_SAMSUNG_WIRELESS_KBD == hdev->product) + ret = samsung_kbd_input_mapping(hdev, + hi, field, usage, bit, max); return ret; } @@ -186,6 +244,7 @@ err_free: static const struct hid_device_id samsung_devices[] = { { HID_USB_DEVICE(USB_VENDOR_ID_SAMSUNG, USB_DEVICE_ID_SAMSUNG_IR_REMOTE) }, { HID_USB_DEVICE(USB_VENDOR_ID_SAMSUNG, USB_DEVICE_ID_SAMSUNG_WIRELESS_KBD_MOUSE) }, + { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_SAMSUNG_ELECTRONICS, USB_DEVICE_ID_SAMSUNG_WIRELESS_KBD) }, { } }; MODULE_DEVICE_TABLE(hid, samsung_devices); diff --git a/drivers/hid/uhid.c b/drivers/hid/uhid.c new file mode 100644 index 0000000..714cd8c --- /dev/null +++ b/drivers/hid/uhid.c @@ -0,0 +1,572 @@ +/* + * User-space I/O driver support for HID subsystem + * Copyright (c) 2012 David Herrmann + */ + +/* + * 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 <linux/atomic.h> +#include <linux/device.h> +#include <linux/fs.h> +#include <linux/hid.h> +#include <linux/input.h> +#include <linux/miscdevice.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/poll.h> +#include <linux/sched.h> +#include <linux/spinlock.h> +#include <linux/uhid.h> +#include <linux/wait.h> + +#define UHID_NAME "uhid" +#define UHID_BUFSIZE 32 + +struct uhid_device { + struct mutex devlock; + bool running; + + __u8 *rd_data; + uint rd_size; + + struct hid_device *hid; + struct uhid_event input_buf; + + wait_queue_head_t waitq; + spinlock_t qlock; + __u8 head; + __u8 tail; + struct uhid_event *outq[UHID_BUFSIZE]; + + struct mutex report_lock; + wait_queue_head_t report_wait; + atomic_t report_done; + atomic_t report_id; + struct uhid_event report_buf; +}; + +static struct miscdevice uhid_misc; + +static void uhid_queue(struct uhid_device *uhid, struct uhid_event *ev) +{ + __u8 newhead; + + newhead = (uhid->head + 1) % UHID_BUFSIZE; + + if (newhead != uhid->tail) { + uhid->outq[uhid->head] = ev; + uhid->head = newhead; + wake_up_interruptible(&uhid->waitq); + } else { + hid_warn(uhid->hid, "Output queue is full\n"); + kfree(ev); + } +} + +static int uhid_queue_event(struct uhid_device *uhid, __u32 event) +{ + unsigned long flags; + struct uhid_event *ev; + + ev = kzalloc(sizeof(*ev), GFP_KERNEL); + if (!ev) + return -ENOMEM; + + ev->type = event; + + spin_lock_irqsave(&uhid->qlock, flags); + uhid_queue(uhid, ev); + spin_unlock_irqrestore(&uhid->qlock, flags); + + return 0; +} + +static int uhid_hid_start(struct hid_device *hid) +{ + struct uhid_device *uhid = hid->driver_data; + + return uhid_queue_event(uhid, UHID_START); +} + +static void uhid_hid_stop(struct hid_device *hid) +{ + struct uhid_device *uhid = hid->driver_data; + + hid->claimed = 0; + uhid_queue_event(uhid, UHID_STOP); +} + +static int uhid_hid_open(struct hid_device *hid) +{ + struct uhid_device *uhid = hid->driver_data; + + return uhid_queue_event(uhid, UHID_OPEN); +} + +static void uhid_hid_close(struct hid_device *hid) +{ + struct uhid_device *uhid = hid->driver_data; + + uhid_queue_event(uhid, UHID_CLOSE); +} + +static int uhid_hid_input(struct input_dev *input, unsigned int type, + unsigned int code, int value) +{ + struct hid_device *hid = input_get_drvdata(input); + struct uhid_device *uhid = hid->driver_data; + unsigned long flags; + struct uhid_event *ev; + + ev = kzalloc(sizeof(*ev), GFP_ATOMIC); + if (!ev) + return -ENOMEM; + + ev->type = UHID_OUTPUT_EV; + ev->u.output_ev.type = type; + ev->u.output_ev.code = code; + ev->u.output_ev.value = value; + + spin_lock_irqsave(&uhid->qlock, flags); + uhid_queue(uhid, ev); + spin_unlock_irqrestore(&uhid->qlock, flags); + + return 0; +} + +static int uhid_hid_parse(struct hid_device *hid) +{ + struct uhid_device *uhid = hid->driver_data; + + return hid_parse_report(hid, uhid->rd_data, uhid->rd_size); +} + +static int uhid_hid_get_raw(struct hid_device *hid, unsigned char rnum, + __u8 *buf, size_t count, unsigned char rtype) +{ + struct uhid_device *uhid = hid->driver_data; + __u8 report_type; + struct uhid_event *ev; + unsigned long flags; + int ret; + size_t uninitialized_var(len); + struct uhid_feature_answer_req *req; + + if (!uhid->running) + return -EIO; + + switch (rtype) { + case HID_FEATURE_REPORT: + report_type = UHID_FEATURE_REPORT; + break; + case HID_OUTPUT_REPORT: + report_type = UHID_OUTPUT_REPORT; + break; + case HID_INPUT_REPORT: + report_type = UHID_INPUT_REPORT; + break; + default: + return -EINVAL; + } + + ret = mutex_lock_interruptible(&uhid->report_lock); + if (ret) + return ret; + + ev = kzalloc(sizeof(*ev), GFP_KERNEL); + if (!ev) { + ret = -ENOMEM; + goto unlock; + } + + spin_lock_irqsave(&uhid->qlock, flags); + ev->type = UHID_FEATURE; + ev->u.feature.id = atomic_inc_return(&uhid->report_id); + ev->u.feature.rnum = rnum; + ev->u.feature.rtype = report_type; + + atomic_set(&uhid->report_done, 0); + uhid_queue(uhid, ev); + spin_unlock_irqrestore(&uhid->qlock, flags); + + ret = wait_event_interruptible_timeout(uhid->report_wait, + atomic_read(&uhid->report_done), 5 * HZ); + + /* + * Make sure "uhid->running" is cleared on shutdown before + * "uhid->report_done" is set. + */ + smp_rmb(); + if (!ret || !uhid->running) { + ret = -EIO; + } else if (ret < 0) { + ret = -ERESTARTSYS; + } else { + spin_lock_irqsave(&uhid->qlock, flags); + req = &uhid->report_buf.u.feature_answer; + + if (req->err) { + ret = -EIO; + } else { + ret = 0; + len = min(count, + min_t(size_t, req->size, UHID_DATA_MAX)); + memcpy(buf, req->data, len); + } + + spin_unlock_irqrestore(&uhid->qlock, flags); + } + + atomic_set(&uhid->report_done, 1); + +unlock: + mutex_unlock(&uhid->report_lock); + return ret ? ret : len; +} + +static int uhid_hid_output_raw(struct hid_device *hid, __u8 *buf, size_t count, + unsigned char report_type) +{ + struct uhid_device *uhid = hid->driver_data; + __u8 rtype; + unsigned long flags; + struct uhid_event *ev; + + switch (report_type) { + case HID_FEATURE_REPORT: + rtype = UHID_FEATURE_REPORT; + break; + case HID_OUTPUT_REPORT: + rtype = UHID_OUTPUT_REPORT; + break; + default: + return -EINVAL; + } + + if (count < 1 || count > UHID_DATA_MAX) + return -EINVAL; + + ev = kzalloc(sizeof(*ev), GFP_KERNEL); + if (!ev) + return -ENOMEM; + + ev->type = UHID_OUTPUT; + ev->u.output.size = count; + ev->u.output.rtype = rtype; + memcpy(ev->u.output.data, buf, count); + + spin_lock_irqsave(&uhid->qlock, flags); + uhid_queue(uhid, ev); + spin_unlock_irqrestore(&uhid->qlock, flags); + + return count; +} + +static struct hid_ll_driver uhid_hid_driver = { + .start = uhid_hid_start, + .stop = uhid_hid_stop, + .open = uhid_hid_open, + .close = uhid_hid_close, + .hidinput_input_event = uhid_hid_input, + .parse = uhid_hid_parse, +}; + +static int uhid_dev_create(struct uhid_device *uhid, + const struct uhid_event *ev) +{ + struct hid_device *hid; + int ret; + + if (uhid->running) + return -EALREADY; + + uhid->rd_size = ev->u.create.rd_size; + if (uhid->rd_size <= 0 || uhid->rd_size > HID_MAX_DESCRIPTOR_SIZE) + return -EINVAL; + + uhid->rd_data = kmalloc(uhid->rd_size, GFP_KERNEL); + if (!uhid->rd_data) + return -ENOMEM; + + if (copy_from_user(uhid->rd_data, ev->u.create.rd_data, + uhid->rd_size)) { + ret = -EFAULT; + goto err_free; + } + + hid = hid_allocate_device(); + if (IS_ERR(hid)) { + ret = PTR_ERR(hid); + goto err_free; + } + + strncpy(hid->name, ev->u.create.name, 127); + hid->name[127] = 0; + strncpy(hid->phys, ev->u.create.phys, 63); + hid->phys[63] = 0; + strncpy(hid->uniq, ev->u.create.uniq, 63); + hid->uniq[63] = 0; + + hid->ll_driver = &uhid_hid_driver; + hid->hid_get_raw_report = uhid_hid_get_raw; + hid->hid_output_raw_report = uhid_hid_output_raw; + hid->bus = ev->u.create.bus; + hid->vendor = ev->u.create.vendor; + hid->product = ev->u.create.product; + hid->version = ev->u.create.version; + hid->country = ev->u.create.country; + hid->driver_data = uhid; + hid->dev.parent = uhid_misc.this_device; + + uhid->hid = hid; + uhid->running = true; + + ret = hid_add_device(hid); + if (ret) { + hid_err(hid, "Cannot register HID device\n"); + goto err_hid; + } + + return 0; + +err_hid: + hid_destroy_device(hid); + uhid->hid = NULL; + uhid->running = false; +err_free: + kfree(uhid->rd_data); + return ret; +} + +static int uhid_dev_destroy(struct uhid_device *uhid) +{ + if (!uhid->running) + return -EINVAL; + + /* clear "running" before setting "report_done" */ + uhid->running = false; + smp_wmb(); + atomic_set(&uhid->report_done, 1); + wake_up_interruptible(&uhid->report_wait); + + hid_destroy_device(uhid->hid); + kfree(uhid->rd_data); + + return 0; +} + +static int uhid_dev_input(struct uhid_device *uhid, struct uhid_event *ev) +{ + if (!uhid->running) + return -EINVAL; + + hid_input_report(uhid->hid, HID_INPUT_REPORT, ev->u.input.data, + min_t(size_t, ev->u.input.size, UHID_DATA_MAX), 0); + + return 0; +} + +static int uhid_dev_feature_answer(struct uhid_device *uhid, + struct uhid_event *ev) +{ + unsigned long flags; + + if (!uhid->running) + return -EINVAL; + + spin_lock_irqsave(&uhid->qlock, flags); + + /* id for old report; drop it silently */ + if (atomic_read(&uhid->report_id) != ev->u.feature_answer.id) + goto unlock; + if (atomic_read(&uhid->report_done)) + goto unlock; + + memcpy(&uhid->report_buf, ev, sizeof(*ev)); + atomic_set(&uhid->report_done, 1); + wake_up_interruptible(&uhid->report_wait); + +unlock: + spin_unlock_irqrestore(&uhid->qlock, flags); + return 0; +} + +static int uhid_char_open(struct inode *inode, struct file *file) +{ + struct uhid_device *uhid; + + uhid = kzalloc(sizeof(*uhid), GFP_KERNEL); + if (!uhid) + return -ENOMEM; + + mutex_init(&uhid->devlock); + mutex_init(&uhid->report_lock); + spin_lock_init(&uhid->qlock); + init_waitqueue_head(&uhid->waitq); + init_waitqueue_head(&uhid->report_wait); + uhid->running = false; + atomic_set(&uhid->report_done, 1); + + file->private_data = uhid; + nonseekable_open(inode, file); + + return 0; +} + +static int uhid_char_release(struct inode *inode, struct file *file) +{ + struct uhid_device *uhid = file->private_data; + unsigned int i; + + uhid_dev_destroy(uhid); + + for (i = 0; i < UHID_BUFSIZE; ++i) + kfree(uhid->outq[i]); + + kfree(uhid); + + return 0; +} + +static ssize_t uhid_char_read(struct file *file, char __user *buffer, + size_t count, loff_t *ppos) +{ + struct uhid_device *uhid = file->private_data; + int ret; + unsigned long flags; + size_t len; + + /* they need at least the "type" member of uhid_event */ + if (count < sizeof(__u32)) + return -EINVAL; + +try_again: + if (file->f_flags & O_NONBLOCK) { + if (uhid->head == uhid->tail) + return -EAGAIN; + } else { + ret = wait_event_interruptible(uhid->waitq, + uhid->head != uhid->tail); + if (ret) + return ret; + } + + ret = mutex_lock_interruptible(&uhid->devlock); + if (ret) + return ret; + + if (uhid->head == uhid->tail) { + mutex_unlock(&uhid->devlock); + goto try_again; + } else { + len = min(count, sizeof(**uhid->outq)); + if (copy_to_user(buffer, uhid->outq[uhid->tail], len)) { + ret = -EFAULT; + } else { + kfree(uhid->outq[uhid->tail]); + uhid->outq[uhid->tail] = NULL; + + spin_lock_irqsave(&uhid->qlock, flags); + uhid->tail = (uhid->tail + 1) % UHID_BUFSIZE; + spin_unlock_irqrestore(&uhid->qlock, flags); + } + } + + mutex_unlock(&uhid->devlock); + return ret ? ret : len; +} + +static ssize_t uhid_char_write(struct file *file, const char __user *buffer, + size_t count, loff_t *ppos) +{ + struct uhid_device *uhid = file->private_data; + int ret; + size_t len; + + /* we need at least the "type" member of uhid_event */ + if (count < sizeof(__u32)) + return -EINVAL; + + ret = mutex_lock_interruptible(&uhid->devlock); + if (ret) + return ret; + + memset(&uhid->input_buf, 0, sizeof(uhid->input_buf)); + len = min(count, sizeof(uhid->input_buf)); + if (copy_from_user(&uhid->input_buf, buffer, len)) { + ret = -EFAULT; + goto unlock; + } + + switch (uhid->input_buf.type) { + case UHID_CREATE: + ret = uhid_dev_create(uhid, &uhid->input_buf); + break; + case UHID_DESTROY: + ret = uhid_dev_destroy(uhid); + break; + case UHID_INPUT: + ret = uhid_dev_input(uhid, &uhid->input_buf); + break; + case UHID_FEATURE_ANSWER: + ret = uhid_dev_feature_answer(uhid, &uhid->input_buf); + break; + default: + ret = -EOPNOTSUPP; + } + +unlock: + mutex_unlock(&uhid->devlock); + + /* return "count" not "len" to not confuse the caller */ + return ret ? ret : count; +} + +static unsigned int uhid_char_poll(struct file *file, poll_table *wait) +{ + struct uhid_device *uhid = file->private_data; + + poll_wait(file, &uhid->waitq, wait); + + if (uhid->head != uhid->tail) + return POLLIN | POLLRDNORM; + + return 0; +} + +static const struct file_operations uhid_fops = { + .owner = THIS_MODULE, + .open = uhid_char_open, + .release = uhid_char_release, + .read = uhid_char_read, + .write = uhid_char_write, + .poll = uhid_char_poll, + .llseek = no_llseek, +}; + +static struct miscdevice uhid_misc = { + .fops = &uhid_fops, + .minor = MISC_DYNAMIC_MINOR, + .name = UHID_NAME, +}; + +static int __init uhid_init(void) +{ + return misc_register(&uhid_misc); +} + +static void __exit uhid_exit(void) +{ + misc_deregister(&uhid_misc); +} + +module_init(uhid_init); +module_exit(uhid_exit); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>"); +MODULE_DESCRIPTION("User-space I/O driver support for HID subsystem"); |