HID: roccat: Add ioctl command to retreive report size from chardev

Roccat chardev was reworked to support only a defined report size per
device and this can be retreived by an ioctl now to enable future changes
in report definitions.
Header was moved/renamed from drivers/hid to include/linux for accessibility.

Signed-off-by: Stefan Achatz <erazor_de@users.sourceforge.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt
index ac293e9..b0f1fa0 100644 (file)
--- a/Documentation/ioctl/ioctl-number.txt
+++ b/Documentation/ioctl/ioctl-number.txt
@@ -133,6 +133,7 @@ Code  Seq#(hex)     Include File            Comments
 'H'    C0-DF   net/bluetooth/hidp/hidp.h       conflict!
 'H'    C0-DF   net/bluetooth/cmtp/cmtp.h       conflict!
 'H'    C0-DF   net/bluetooth/bnep/bnep.h       conflict!
+'H'    F1      linux/roccat.h          <mailto:erazor_de@users.sourceforge.net>
 'I'    all     linux/isdn.h            conflict!
 'I'    00-0F   drivers/isdn/divert/isdn_divert.h       conflict!
 'I'    40-4F   linux/mISDNif.h         conflict!

diff --git a/drivers/hid/hid-roccat-arvo.c b/drivers/hid/hid-roccat-arvo.c
index d72ee41..7b9a992 100644 (file)
--- a/drivers/hid/hid-roccat-arvo.c
+++ b/drivers/hid/hid-roccat-arvo.c
@@ -21,8 +21,8 @@
 #include <linux/hid.h>
 #include <linux/module.h>
 #include <linux/slab.h>
+#include <linux/roccat.h>
 #include "hid-ids.h"
-#include "hid-roccat.h"
 #include "hid-roccat-common.h"
 #include "hid-roccat-arvo.h"
 
@@ -303,7 +303,8 @@ static int arvo_init_specials(struct hid_device *hdev)
                goto exit_free;
        }
 
-       retval = roccat_connect(arvo_class, hdev);
+       retval = roccat_connect(arvo_class, hdev,
+                       sizeof(struct arvo_roccat_report));
        if (retval < 0) {
                hid_err(hdev, "couldn't init char dev\n");
        } else {
@@ -386,8 +387,8 @@ static void arvo_report_to_chrdev(struct arvo_device const *arvo,
        else
                roccat_report.action = ARVO_ROCCAT_REPORT_ACTION_RELEASE;
 
-       roccat_report_event(arvo->chrdev_minor, (uint8_t const *)&roccat_report,
-                       sizeof(struct arvo_roccat_report));
+       roccat_report_event(arvo->chrdev_minor,
+                       (uint8_t const *)&roccat_report);
 }
 
 static int arvo_raw_event(struct hid_device *hdev,

diff --git a/drivers/hid/hid-roccat-kone.c b/drivers/hid/hid-roccat-kone.c
index 5516653..5cdb282 100644 (file)
--- a/drivers/hid/hid-roccat-kone.c
+++ b/drivers/hid/hid-roccat-kone.c
@@ -30,8 +30,8 @@
 #include <linux/hid.h>
 #include <linux/module.h>
 #include <linux/slab.h>
+#include <linux/roccat.h>
 #include "hid-ids.h"
-#include "hid-roccat.h"
 #include "hid-roccat-common.h"
 #include "hid-roccat-kone.h"
 
@@ -660,7 +660,8 @@ static int kone_init_specials(struct hid_device *hdev)
                        goto exit_free;
                }
 
-               retval = roccat_connect(kone_class, hdev);
+               retval = roccat_connect(kone_class, hdev,
+                               sizeof(struct kone_roccat_report));
                if (retval < 0) {
                        hid_err(hdev, "couldn't init char dev\n");
                        /* be tolerant about not getting chrdev */
@@ -760,8 +761,7 @@ static void kone_report_to_chrdev(struct kone_device const *kone,
                roccat_report.value = event->value;
                roccat_report.key = 0;
                roccat_report_event(kone->chrdev_minor,
-                               (uint8_t *)&roccat_report,
-                               sizeof(struct kone_roccat_report));
+                               (uint8_t *)&roccat_report);
                break;
        case kone_mouse_event_call_overlong_macro:
                if (event->value == kone_keystroke_action_press) {
@@ -769,8 +769,7 @@ static void kone_report_to_chrdev(struct kone_device const *kone,
                        roccat_report.value = kone->actual_profile;
                        roccat_report.key = event->macro_key;
                        roccat_report_event(kone->chrdev_minor,
-                                       (uint8_t *)&roccat_report,
-                                       sizeof(struct kone_roccat_report));
+                                       (uint8_t *)&roccat_report);
                }
                break;
        }

diff --git a/drivers/hid/hid-roccat-koneplus.c b/drivers/hid/hid-roccat-koneplus.c
index df85ed8..7367e4e 100644 (file)
--- a/drivers/hid/hid-roccat-koneplus.c
+++ b/drivers/hid/hid-roccat-koneplus.c
@@ -21,8 +21,8 @@
 #include <linux/hid.h>
 #include <linux/module.h>
 #include <linux/slab.h>
+#include <linux/roccat.h>
 #include "hid-ids.h"
-#include "hid-roccat.h"
 #include "hid-roccat-common.h"
 #include "hid-roccat-koneplus.h"
 
@@ -612,7 +612,8 @@ static int koneplus_init_specials(struct hid_device *hdev)
                        goto exit_free;
                }
 
-               retval = roccat_connect(koneplus_class, hdev);
+               retval = roccat_connect(koneplus_class, hdev,
+                               sizeof(struct koneplus_roccat_report));
                if (retval < 0) {
                        hid_err(hdev, "couldn't init char dev\n");
                } else {
@@ -718,8 +719,7 @@ static void koneplus_report_to_chrdev(struct koneplus_device const *koneplus,
        roccat_report.data2 = button_report->data2;
        roccat_report.profile = koneplus->actual_profile + 1;
        roccat_report_event(koneplus->chrdev_minor,
-                       (uint8_t const *)&roccat_report,
-                       sizeof(struct koneplus_roccat_report));
+                       (uint8_t const *)&roccat_report);
 }
 
 static int koneplus_raw_event(struct hid_device *hdev,

diff --git a/drivers/hid/hid-roccat-kovaplus.c b/drivers/hid/hid-roccat-kovaplus.c
index 1f547a2..7664e2c 100644 (file)
--- a/drivers/hid/hid-roccat-kovaplus.c
+++ b/drivers/hid/hid-roccat-kovaplus.c
@@ -20,8 +20,8 @@
 #include <linux/hid.h>
 #include <linux/module.h>
 #include <linux/slab.h>
+#include <linux/roccat.h>
 #include "hid-ids.h"
-#include "hid-roccat.h"
 #include "hid-roccat-common.h"
 #include "hid-roccat-kovaplus.h"
 
@@ -524,7 +524,8 @@ static int kovaplus_init_specials(struct hid_device *hdev)
                        goto exit_free;
                }
 
-               retval = roccat_connect(kovaplus_class, hdev);
+               retval = roccat_connect(kovaplus_class, hdev,
+                               sizeof(struct kovaplus_roccat_report));
                if (retval < 0) {
                        hid_err(hdev, "couldn't init char dev\n");
                } else {
@@ -648,8 +649,7 @@ static void kovaplus_report_to_chrdev(struct kovaplus_device const *kovaplus,
        roccat_report.data2 = button_report->data2;
 
        roccat_report_event(kovaplus->chrdev_minor,
-                       (uint8_t const *)&roccat_report,
-                       sizeof(struct kovaplus_roccat_report));
+                       (uint8_t const *)&roccat_report);
 }
 
 static int kovaplus_raw_event(struct hid_device *hdev,

diff --git a/drivers/hid/hid-roccat-pyra.c b/drivers/hid/hid-roccat-pyra.c
index abe77d3..be4daa9 100644 (file)
--- a/drivers/hid/hid-roccat-pyra.c
+++ b/drivers/hid/hid-roccat-pyra.c
@@ -22,8 +22,8 @@
 #include <linux/hid.h>
 #include <linux/module.h>
 #include <linux/slab.h>
+#include <linux/roccat.h>
 #include "hid-ids.h"
-#include "hid-roccat.h"
 #include "hid-roccat-common.h"
 #include "hid-roccat-pyra.h"
 
@@ -506,7 +506,8 @@ static int pyra_init_specials(struct hid_device *hdev)
                        goto exit_free;
                }
 
-               retval = roccat_connect(pyra_class, hdev);
+               retval = roccat_connect(pyra_class, hdev,
+                               sizeof(struct pyra_roccat_report));
                if (retval < 0) {
                        hid_err(hdev, "couldn't init char dev\n");
                } else {
@@ -610,8 +611,7 @@ static void pyra_report_to_chrdev(struct pyra_device const *pyra,
                roccat_report.value = button_event->data1;
                roccat_report.key = 0;
                roccat_report_event(pyra->chrdev_minor,
-                               (uint8_t const *)&roccat_report,
-                               sizeof(struct pyra_roccat_report));
+                               (uint8_t const *)&roccat_report);
                break;
        case PYRA_MOUSE_EVENT_BUTTON_TYPE_MACRO:
        case PYRA_MOUSE_EVENT_BUTTON_TYPE_SHORTCUT:
@@ -625,8 +625,7 @@ static void pyra_report_to_chrdev(struct pyra_device const *pyra,
                         */
                        roccat_report.value = pyra->actual_profile + 1;
                        roccat_report_event(pyra->chrdev_minor,
-                                       (uint8_t const *)&roccat_report,
-                                       sizeof(struct pyra_roccat_report));
+                                       (uint8_t const *)&roccat_report);
                }
                break;
        }

diff --git a/drivers/hid/hid-roccat.c b/drivers/hid/hid-roccat.c
index a14c579..0fa23de 100644 (file)
--- a/drivers/hid/hid-roccat.c
+++ b/drivers/hid/hid-roccat.c
@@ -26,8 +26,7 @@
 #include <linux/cdev.h>
 #include <linux/poll.h>
 #include <linux/sched.h>
-
-#include "hid-roccat.h"
+#include <linux/roccat.h>
 
 #define ROCCAT_FIRST_MINOR 0
 #define ROCCAT_MAX_DEVICES 8
@@ -37,11 +36,11 @@
 
 struct roccat_report {
        uint8_t *value;
-       int len;
 };
 
 struct roccat_device {
        unsigned int minor;
+       int report_size;
        int open;
        int exist;
        wait_queue_head_t wait;
@@ -123,7 +122,7 @@ static ssize_t roccat_read(struct file *file, char __user *buffer,
         * If report is larger than requested amount of data, rest of report
         * is lost!
         */
-       len = report->len > count ? count : report->len;
+       len = device->report_size > count ? count : device->report_size;
 
        if (copy_to_user(buffer, report->value, len)) {
                retval = -EFAULT;
@@ -248,26 +247,25 @@ static int roccat_release(struct inode *inode, struct file *file)
  *
  * This is called from interrupt handler.
  */
-int roccat_report_event(int minor, u8 const *data, int len)
+int roccat_report_event(int minor, u8 const *data)
 {
        struct roccat_device *device;
        struct roccat_reader *reader;
        struct roccat_report *report;
        uint8_t *new_value;
 
-       new_value = kmemdup(data, len, GFP_ATOMIC);
+       device = devices[minor];
+
+       new_value = kmemdup(data, device->report_size, GFP_ATOMIC);
        if (!new_value)
                return -ENOMEM;
 
-       device = devices[minor];
-
        report = &device->cbuf[device->cbuf_end];
 
        /* passing NULL is safe */
        kfree(report->value);
 
        report->value = new_value;
-       report->len = len;
        device->cbuf_end = (device->cbuf_end + 1) % ROCCAT_CBUF_SIZE;
 
        list_for_each_entry(reader, &device->readers, node) {
@@ -295,7 +293,7 @@ EXPORT_SYMBOL_GPL(roccat_report_event);
  * Return value is minor device number in Range [0, ROCCAT_MAX_DEVICES] on
  * success, a negative error code on failure.
  */
-int roccat_connect(struct class *klass, struct hid_device *hid)
+int roccat_connect(struct class *klass, struct hid_device *hid, int report_size)
 {
        unsigned int minor;
        struct roccat_device *device;
@@ -343,6 +341,7 @@ int roccat_connect(struct class *klass, struct hid_device *hid)
        device->hid = hid;
        device->exist = 1;
        device->cbuf_end = 0;
+       device->report_size = report_size;
 
        return minor;
 }
@@ -373,6 +372,34 @@ void roccat_disconnect(int minor)
 }
 EXPORT_SYMBOL_GPL(roccat_disconnect);
 
+static long roccat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+       struct inode *inode = file->f_path.dentry->d_inode;
+       struct roccat_device *device;
+       unsigned int minor = iminor(inode);
+       long retval = 0;
+
+       mutex_lock(&devices_lock);
+
+       device = devices[minor];
+       if (!device) {
+               retval = -ENODEV;
+               goto out;
+       }
+
+       switch (cmd) {
+       case ROCCATIOCGREPSIZE:
+               if (put_user(device->report_size, (int __user *)arg))
+                       retval = -EFAULT;
+               break;
+       default:
+               retval = -ENOTTY;
+       }
+out:
+       mutex_unlock(&devices_lock);
+       return retval;
+}
+
 static const struct file_operations roccat_ops = {
        .owner = THIS_MODULE,
        .read = roccat_read,
@@ -380,6 +407,7 @@ static const struct file_operations roccat_ops = {
        .open = roccat_open,
        .release = roccat_release,
        .llseek = noop_llseek,
+       .unlocked_ioctl = roccat_ioctl,
 };
 
 static int __init roccat_init(void)

diff --git a/drivers/hid/hid-roccat.h b/include/linux/roccat.h
similarity index 69%
rename from drivers/hid/hid-roccat.h
rename to include/linux/roccat.h
index c739337..24e1ca0 100644 (file)
--- a/drivers/hid/hid-roccat.h
+++ b/include/linux/roccat.h
@@ -15,8 +15,15 @@
 #include <linux/hid.h>
 #include <linux/types.h>
 
-int roccat_connect(struct class *klass, struct hid_device *hid);
+#define ROCCATIOCGREPSIZE _IOR('H', 0xf1, int)
+
+#ifdef __KERNEL__
+
+int roccat_connect(struct class *klass, struct hid_device *hid,
+               int report_size);
 void roccat_disconnect(int minor);
-int roccat_report_event(int minor, u8 const *data, int len);
+int roccat_report_event(int minor, u8 const *data);
+
+#endif
 
 #endif