HID: roccat: propagate special events of roccat hardware to userspace

Module roccat is a char device used to report special events of roccat hardware
to userland. These events include requests for on-screen-display of profile or
dpi settings or requests for execution of macro sequences that are not stored
in device. The information in these events depends on hid device implementation
and contains data that is not available in a single hid event or else hidraw
could have been used.

It is inspired by hidraw, but uses only one circular buffer for all readers.
The device is as generic as possible so that the functionality is usable by all
(kone and upcomming) roccat device drivers.

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

6 files changed, 526 insertions, 0 deletions

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 76ba59b9fea1..132278fa6240 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -347,6 +347,14 @@ config HID_QUANTA
         ---help---
         Support for Quanta Optical Touch dual-touch panels.
 
+config HID_ROCCAT
+        tristate "Roccat special event support"
+        depends on USB_HID
+        ---help---
+        Support for Roccat special events.
+        Say Y here if you have a Roccat mouse or keyboard and want OSD or
+        macro execution support.
+
 config HID_ROCCAT_KONE
         tristate "Roccat Kone Mouse support"
         depends on USB_HID
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index 22e47eaeea32..987fa0627367 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -48,6 +48,7 @@ obj-$(CONFIG_HID_QUANTA)	+= hid-quanta.o
 obj-$(CONFIG_HID_PANTHERLORD)   += hid-pl.o
 obj-$(CONFIG_HID_PETALYNX)      += hid-petalynx.o
 obj-$(CONFIG_HID_PICOLCD)       += hid-picolcd.o
+obj-$(CONFIG_HID_ROCCAT)        += hid-roccat.o
 obj-$(CONFIG_HID_ROCCAT_KONE)   += hid-roccat-kone.o
 obj-$(CONFIG_HID_SAMSUNG)       += hid-samsung.o
 obj-$(CONFIG_HID_SMARTJOYPLUS)  += hid-sjoy.o
diff --git a/drivers/hid/hid-roccat-kone.c b/drivers/hid/hid-roccat-kone.c
index b6371d3fe0f9..17f2dc04f883 100644
--- a/drivers/hid/hid-roccat-kone.c
+++ b/drivers/hid/hid-roccat-kone.c
@@ -37,6 +37,7 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include "hid-ids.h"
+#include "hid-roccat.h"
 #include "hid-roccat-kone.h"
 
 static void kone_set_settings_checksum(struct kone_settings *settings)
@@ -849,6 +850,16 @@ static int kone_init_specials(struct hid_device *hdev)
                                         "couldn't init struct kone_device\n");
                         goto exit_free;
                 }
+
+                retval = roccat_connect(hdev);
+                if (retval < 0) {
+                        dev_err(&hdev->dev, "couldn't init char dev\n");
+                        /* be tolerant about not getting chrdev */
+                } else {
+                        kone->roccat_claimed = 1;
+                        kone->chrdev_minor = retval;
+                }
+
                 retval = kone_create_sysfs_attributes(intf);
                 if (retval) {
                         dev_err(&hdev->dev, "cannot create sysfs files\n");
@@ -868,10 +879,14 @@ exit_free:
 static void kone_remove_specials(struct hid_device *hdev)
 {
         struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
+        struct kone_device *kone;
 
         if (intf->cur_altsetting->desc.bInterfaceProtocol
                         == USB_INTERFACE_PROTOCOL_MOUSE) {
                 kone_remove_sysfs_attributes(intf);
+                kone = hid_get_drvdata(hdev);
+                if (kone->roccat_claimed)
+                        roccat_disconnect(kone->chrdev_minor);
                 kfree(hid_get_drvdata(hdev));
         }
 }
@@ -930,6 +945,37 @@ static void kone_keep_values_up_to_date(struct kone_device *kone,
         }
 }
 
+static void kone_report_to_chrdev(struct kone_device const *kone,
+                struct kone_mouse_event const *event)
+{
+        struct kone_roccat_report roccat_report;
+
+        switch (event->event) {
+        case kone_mouse_event_switch_profile:
+        case kone_mouse_event_switch_dpi:
+        case kone_mouse_event_osd_profile:
+        case kone_mouse_event_osd_dpi:
+                roccat_report.event = event->event;
+                roccat_report.value = event->value;
+                roccat_report.key = 0;
+                roccat_report_event(kone->chrdev_minor,
+                                (uint8_t *)&roccat_report,
+                                sizeof(struct kone_roccat_report));
+                break;
+        case kone_mouse_event_call_overlong_macro:
+                if (event->value == kone_keystroke_action_press) {
+                        roccat_report.event = kone_mouse_event_call_overlong_macro;
+                        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));
+                }
+                break;
+        }
+
+}
+
 /*
  * Is called for keyboard- and mousepart.
  * Only mousepart gets informations about special events in its extended event
@@ -958,6 +1004,9 @@ static int kone_raw_event(struct hid_device *hdev, struct hid_report *report,
 
         kone_keep_values_up_to_date(kone, event);
 
+        if (kone->roccat_claimed)
+                kone_report_to_chrdev(kone, event);
+
         return 0; /* always do further processing */
 }
 
diff --git a/drivers/hid/hid-roccat-kone.h b/drivers/hid/hid-roccat-kone.h
index b413b10a7f8a..003e6f81c195 100644
--- a/drivers/hid/hid-roccat-kone.h
+++ b/drivers/hid/hid-roccat-kone.h
@@ -189,6 +189,12 @@ enum kone_commands {
         kone_command_firmware = 0xe5a
 };
 
+struct kone_roccat_report {
+        uint8_t event;
+        uint8_t value; /* holds dpi or profile value */
+        uint8_t key; /* macro key on overlong macro execution */
+};
+
 #pragma pack(pop)
 
 struct kone_device {
@@ -219,6 +225,9 @@ struct kone_device {
          * so it's read only once
          */
         int firmware_version;
+
+        int roccat_claimed;
+        int chrdev_minor;
 };
 
 #endif
diff --git a/drivers/hid/hid-roccat.c b/drivers/hid/hid-roccat.c
new file mode 100644
index 000000000000..e05d48edb66f
--- /dev/null
+++ b/drivers/hid/hid-roccat.c
@@ -0,0 +1,428 @@
+/*
+ * Roccat driver for Linux
+ *
+ * Copyright (c) 2010 Stefan Achatz <erazor_de@users.sourceforge.net>
+ */
+
+/*
+ * 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.
+ */
+
+/*
+ * Module roccat is a char device used to report special events of roccat
+ * hardware to userland. These events include requests for on-screen-display of
+ * profile or dpi settings or requests for execution of macro sequences that are