5 files changed, 130 insertions, 0 deletions

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 306b15f39c9c..121eed528496 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -441,6 +441,14 @@ config HID_PICOLCD_LEDS
         ---help---
           Provide access to PicoLCD's GPO pins via leds class.
 
+config HID_PRIMAX
+        tristate "Primax non-fully HID-compliant devices" if EXPERT
+        depends on USB_HID
+        default !EXPERT
+        ---help---
+        Support for Primax devices that are not fully compliant with the
+        HID standard.
+
 config HID_QUANTA
         tristate "Quanta Optical Touch panels"
         depends on USB_HID
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index 0a0a38e9fd28..735b8cce2c88 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -54,6 +54,7 @@ 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-$(CONFIG_HID_PRIMAX)        += hid-primax.o
 obj-$(CONFIG_HID_ROCCAT)        += hid-roccat.o
 obj-$(CONFIG_HID_ROCCAT_COMMON) += hid-roccat-common.o
 obj-$(CONFIG_HID_ROCCAT_ARVO)   += hid-roccat-arvo.o
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index d5dae955cc42..df693e7ccc9e 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1480,6 +1480,7 @@ static const struct hid_device_id hid_have_special_driver[] = {
         { HID_USB_DEVICE(USB_VENDOR_ID_ORTEK, USB_DEVICE_ID_ORTEK_WKB2000) },
         { HID_USB_DEVICE(USB_VENDOR_ID_PENMOUNT, USB_DEVICE_ID_PENMOUNT_PCI) },
         { HID_USB_DEVICE(USB_VENDOR_ID_PETALYNX, USB_DEVICE_ID_PETALYNX_MAXTER_REMOTE) },
+        { HID_USB_DEVICE(USB_VENDOR_ID_PRIMAX, USB_DEVICE_ID_PRIMAX_KEYBOARD) },
         { HID_USB_DEVICE(USB_VENDOR_ID_QUANTA, USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH) },
         { HID_USB_DEVICE(USB_VENDOR_ID_QUANTA, USB_DEVICE_ID_PIXART_IMAGING_INC_OPTICAL_TOUCH_SCREEN) },
         { HID_USB_DEVICE(USB_VENDOR_ID_ROCCAT, USB_DEVICE_ID_ROCCAT_KONE) },
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index aa7419350603..fa7579b6b06f 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -692,4 +692,7 @@
 #define USB_VENDOR_ID_ZYDACRON  0x13EC
 #define USB_DEVICE_ID_ZYDACRON_REMOTE_CONTROL   0x0006
 
+#define USB_VENDOR_ID_PRIMAX    0x0461
+#define USB_DEVICE_ID_PRIMAX_KEYBOARD   0x4e05
+
 #endif
diff --git a/drivers/hid/hid-primax.c b/drivers/hid/hid-primax.c
new file mode 100644
index 000000000000..4d3c60d88318
--- /dev/null
+++ b/drivers/hid/hid-primax.c
@@ -0,0 +1,117 @@
+/*
+ * HID driver for primax and similar keyboards with in-band modifiers
+ *
+ * Copyright 2011 Google Inc. All Rights Reserved
+ *
+ * Author:
+ *      Terry Lambert <tlambert@google.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+
+#include "hid-ids.h"
+
+static int px_raw_event(struct hid_device *hid, struct hid_report *report,
+         u8 *data, int size)
+{
+        int idx = size;
+
+        switch (report->id) {
+        case 0:         /* keyboard input */
+                /*
+                 * Convert in-band modifier key values into out of band
+                 * modifier bits and pull the key strokes from the report.
+                 * Thus a report data set which looked like:
+                 *
+                 * [00][00][E0][30][00][00][00][00]
+                 * (no modifier bits + "Left Shift" key + "1" key)
+                 *
+                 * Would be converted to:
+                 *
+                 * [01][00][00][30][00][00][00][00]
+                 * (Left Shift modifier bit + "1" key)
+                 *
+                 * As long as it's in the size range, the upper level
+                 * drivers don't particularly care if there are in-band
+                 * 0-valued keys, so they don't stop parsing.
+                 */
+                while (--idx > 1) {
+                        if (data[idx] < 0xE0 || data[idx] > 0xE7)
+                                continue;
+                        data[0] |= (1 << (data[idx] - 0xE0));
+                        data[idx] = 0;
+                }
+                hid_report_raw_event(hid, HID_INPUT_REPORT, data, size, 0);
+                return 1;
+
+        default:        /* unknown report */
+                /* Unknown report type; pass upstream */
+                hid_info(hid, "unknown report type %d\n", report->id);
+                break;
+        }
+
+        return 0;
+}
+
+static int px_probe(struct hid_device *hid, const struct hid_device_id *id)
+{
+        int ret;
+
+        ret = hid_parse(hid);
+        if (ret) {
+                hid_err(hid, "parse failed\n");
+                goto fail;
+        }
+
+        ret = hid_hw_start(hid, HID_CONNECT_DEFAULT);
+        if (ret)
+                hid_err(hid, "hw start failed\n");
+
+fail:
+        return ret;
+}
+
+static void px_remove(struct hid_device *hid)
+{
+        hid_hw_stop(hid);
+}
+
+static const struct hid_device_id px_devices[] = {
+        { HID_USB_DEVICE(USB_VENDOR_ID_PRIMAX, USB_DEVICE_ID_PRIMAX_KEYBOARD) },
+        { }
+};
+MODULE_DEVICE_TABLE(hid, px_devices);
+
+static struct hid_driver px_driver = {
+        .name = "primax",
+        .id_table = px_devices,
+        .raw_event = px_raw_event,
+        .probe = px_probe,
+        .remove = px_remove,
+};
+
+static int __init px_init(void)
+{
+        return hid_register_driver(&px_driver);
+}
+
+static void __exit px_exit(void)
+{
+        hid_unregister_driver(&px_driver);
+}
+
+module_init(px_init);
+module_exit(px_exit);
+MODULE_AUTHOR("Terry Lambert <tlambert@google.com>");
+MODULE_LICENSE("GPL");