--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * HID driver for Cougar 500k Gaming Keyboard
+ *
+ * Copyright (c) 2018 Daniel M. Lambea <dmlambea@gmail.com>
+ */
+
+#include <linux/hid.h>
+#include <linux/module.h>
+
+#include "hid-ids.h"
+
+MODULE_AUTHOR("Daniel M. Lambea <dmlambea@gmail.com>");
+MODULE_DESCRIPTION("Cougar 500k Gaming Keyboard");
+MODULE_LICENSE("GPL");
+MODULE_INFO(key_mappings, "G1-G6 are mapped to F13-F18");
+
+static int cougar_g6_is_space = 1;
+module_param_named(g6_is_space, cougar_g6_is_space, int, 0600);
+MODULE_PARM_DESC(g6_is_space,
+ "If set, G6 programmable key sends SPACE instead of F18 (0=off, 1=on) (default=1)");
+
+
+#define COUGAR_VENDOR_USAGE 0xff00ff00
+
+#define COUGAR_FIELD_CODE 1
+#define COUGAR_FIELD_ACTION 2
+
+#define COUGAR_KEY_G1 0x83
+#define COUGAR_KEY_G2 0x84
+#define COUGAR_KEY_G3 0x85
+#define COUGAR_KEY_G4 0x86
+#define COUGAR_KEY_G5 0x87
+#define COUGAR_KEY_G6 0x78
+#define COUGAR_KEY_FN 0x0d
+#define COUGAR_KEY_MR 0x6f
+#define COUGAR_KEY_M1 0x80
+#define COUGAR_KEY_M2 0x81
+#define COUGAR_KEY_M3 0x82
+#define COUGAR_KEY_LEDS 0x67
+#define COUGAR_KEY_LOCK 0x6e
+
+
+/* Default key mappings. The special key COUGAR_KEY_G6 is defined first
+ * because it is more frequent to use the spacebar rather than any other
+ * special keys. Depending on the value of the parameter 'g6_is_space',
+ * the mapping will be updated in the probe function.
+ */
+static unsigned char cougar_mapping[][2] = {
+ { COUGAR_KEY_G6, KEY_SPACE },
+ { COUGAR_KEY_G1, KEY_F13 },
+ { COUGAR_KEY_G2, KEY_F14 },
+ { COUGAR_KEY_G3, KEY_F15 },
+ { COUGAR_KEY_G4, KEY_F16 },
+ { COUGAR_KEY_G5, KEY_F17 },
+ { COUGAR_KEY_LOCK, KEY_SCREENLOCK },
+/* The following keys are handled by the hardware itself, so no special
+ * treatment is required:
+ { COUGAR_KEY_FN, KEY_RESERVED },
+ { COUGAR_KEY_MR, KEY_RESERVED },
+ { COUGAR_KEY_M1, KEY_RESERVED },
+ { COUGAR_KEY_M2, KEY_RESERVED },
+ { COUGAR_KEY_M3, KEY_RESERVED },
+ { COUGAR_KEY_LEDS, KEY_RESERVED },
+*/
+ { 0, 0 },
+};
+
+struct cougar_shared {
+ struct list_head list;
+ struct kref kref;
+ bool enabled;
+ struct hid_device *dev;
+ struct input_dev *input;
+};
+
+struct cougar {
+ bool special_intf;
+ struct cougar_shared *shared;
+};
+
+static LIST_HEAD(cougar_udev_list);
+static DEFINE_MUTEX(cougar_udev_list_lock);
+
+static void cougar_fix_g6_mapping(struct hid_device *hdev)
+{
+ int i;
+
+ for (i = 0; cougar_mapping[i][0]; i++) {
+ if (cougar_mapping[i][0] == COUGAR_KEY_G6) {
+ cougar_mapping[i][1] =
+ cougar_g6_is_space ? KEY_SPACE : KEY_F18;
+ hid_info(hdev, "G6 mapped to %s\n",
+ cougar_g6_is_space ? "space" : "F18");
+ return;
+ }
+ }
+ hid_warn(hdev, "no mapping defined for G6/spacebar");
+}
+
+/*
+ * Constant-friendly rdesc fixup for mouse interface
+ */
+static __u8 *cougar_report_fixup(struct hid_device *hdev, __u8 *rdesc,
+ unsigned int *rsize)
+{
+ if (rdesc[2] == 0x09 && rdesc[3] == 0x02 &&
+ (rdesc[115] | rdesc[116] << 8) >= HID_MAX_USAGES) {
+ hid_info(hdev,
+ "usage count exceeds max: fixing up report descriptor\n");
+ rdesc[115] = ((HID_MAX_USAGES-1) & 0xff);
+ rdesc[116] = ((HID_MAX_USAGES-1) >> 8);
+ }
+ return rdesc;
+}
+
+static struct cougar_shared *cougar_get_shared_data(struct hid_device *hdev)
+{
+ struct cougar_shared *shared;
+
+ /* Try to find an already-probed interface from the same device */
+ list_for_each_entry(shared, &cougar_udev_list, list) {
+ if (hid_compare_device_paths(hdev, shared->dev, '/')) {
+ kref_get(&shared->kref);
+ return shared;
+ }
+ }
+ return NULL;
+}
+
+static void cougar_release_shared_data(struct kref *kref)
+{
+ struct cougar_shared *shared = container_of(kref,
+ struct cougar_shared, kref);
+
+ mutex_lock(&cougar_udev_list_lock);
+ list_del(&shared->list);
+ mutex_unlock(&cougar_udev_list_lock);
+
+ kfree(shared);
+}
+
+static void cougar_remove_shared_data(void *resource)
+{
+ struct cougar *cougar = resource;
+
+ if (cougar->shared) {
+ kref_put(&cougar->shared->kref, cougar_release_shared_data);
+ cougar->shared = NULL;
+ }
+}
+
+/*
+ * Bind the device group's shared data to this cougar struct.
+ * If no shared data exists for this group, create and initialize it.
+ */
+static int cougar_bind_shared_data(struct hid_device *hdev, struct cougar *cougar)
+{
+ struct cougar_shared *shared;
+ int error = 0;
+
+ mutex_lock(&cougar_udev_list_lock);
+
+ shared = cougar_get_shared_data(hdev);
+ if (!shared) {
+ shared = kzalloc(sizeof(*shared), GFP_KERNEL);
+ if (!shared) {
+ error = -ENOMEM;
+ goto out;
+ }
+
+ kref_init(&shared->kref);
+ shared->dev = hdev;
+ list_add_tail(&shared->list, &cougar_udev_list);
+ }
+
+ cougar->shared = shared;
+
+ error = devm_add_action(&hdev->dev, cougar_remove_shared_data, cougar);
+ if (error) {
+ mutex_unlock(&cougar_udev_list_lock);
+ cougar_remove_shared_data(cougar);
+ return error;
+ }
+
+out:
+ mutex_unlock(&cougar_udev_list_lock);
+ return error;
+}
+
+static int cougar_probe(struct hid_device *hdev,
+ const struct hid_device_id *id)
+{
+ struct cougar *cougar;
+ struct hid_input *next, *hidinput = NULL;
+ unsigned int connect_mask;
+ int error;
+
+ cougar = devm_kzalloc(&hdev->dev, sizeof(*cougar), GFP_KERNEL);
+ if (!cougar)
+ return -ENOMEM;
+ hid_set_drvdata(hdev, cougar);
+
+ error = hid_parse(hdev);
+ if (error) {
+ hid_err(hdev, "parse failed\n");
+ goto fail;
+ }
+
+ if (hdev->collection->usage == COUGAR_VENDOR_USAGE) {
+ cougar->special_intf = true;
+ connect_mask = HID_CONNECT_HIDRAW;
+ } else
+ connect_mask = HID_CONNECT_DEFAULT;
+
+ error = hid_hw_start(hdev, connect_mask);
+ if (error) {
+ hid_err(hdev, "hw start failed\n");
+ goto fail;
+ }
+
+ error = cougar_bind_shared_data(hdev, cougar);
+ if (error)
+ goto fail_stop_and_cleanup;
+
+ /* The custom vendor interface will use the hid_input registered
+ * for the keyboard interface, in order to send translated key codes
+ * to it.
+ */
+ if (hdev->collection->usage == HID_GD_KEYBOARD) {
+ cougar_fix_g6_mapping(hdev);
+ list_for_each_entry_safe(hidinput, next, &hdev->inputs, list) {
+ if (hidinput->registered && hidinput->input != NULL) {
+ cougar->shared->input = hidinput->input;
+ cougar->shared->enabled = true;
+ break;
+ }
+ }
+ } else if (hdev->collection->usage == COUGAR_VENDOR_USAGE) {
+ error = hid_hw_open(hdev);
+ if (error)
+ goto fail_stop_and_cleanup;
+ }
+ return 0;
+
+fail_stop_and_cleanup:
+ hid_hw_stop(hdev);
+fail:
+ hid_set_drvdata(hdev, NULL);
+ return error;
+}
+
+/*
+ * Convert events from vendor intf to input key events
+ */
+static int cougar_raw_event(struct hid_device *hdev, struct hid_report *report,
+ u8 *data, int size)
+{
+ struct cougar *cougar;
+ unsigned char code, action;
+ int i;
+
+ cougar = hid_get_drvdata(hdev);
+ if (!cougar->special_intf || !cougar->shared ||
+ !cougar->shared->input || !cougar->shared->enabled)
+ return 0;
+
+ code = data[COUGAR_FIELD_CODE];
+ action = data[COUGAR_FIELD_ACTION];
+ for (i = 0; cougar_mapping[i][0]; i++) {
+ if (code == cougar_mapping[i][0]) {
+ input_event(cougar->shared->input, EV_KEY,
+ cougar_mapping[i][1], action);
+ input_sync(cougar->shared->input);
+ return 0;
+ }
+ }
+ hid_warn(hdev, "unmapped special key code %x: ignoring\n", code);
+ return 0;
+}
+
+static void cougar_remove(struct hid_device *hdev)
+{
+ struct cougar *cougar = hid_get_drvdata(hdev);
+
+ if (cougar) {
+ /* Stop the vendor intf to process more events */
+ if (cougar->shared)
+ cougar->shared->enabled = false;
+ if (cougar->special_intf)
+ hid_hw_close(hdev);
+ }
+ hid_hw_stop(hdev);
+}
+
+static struct hid_device_id cougar_id_table[] = {
+ { HID_USB_DEVICE(USB_VENDOR_ID_SOLID_YEAR,
+ USB_DEVICE_ID_COUGAR_500K_GAMING_KEYBOARD) },
+ {}
+};
+MODULE_DEVICE_TABLE(hid, cougar_id_table);
+
+static struct hid_driver cougar_driver = {
+ .name = "cougar",
+ .id_table = cougar_id_table,
+ .report_fixup = cougar_report_fixup,
+ .probe = cougar_probe,
+ .remove = cougar_remove,
+ .raw_event = cougar_raw_event,
+};
+
+module_hid_driver(cougar_driver);
projects / linux-2.6-microblaze.git / commitdiff