linux/drivers/hid/hid-cougar.c

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// 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 <linux/printk.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 bool g6_is_space = true;
MODULE_PARM_DESC(g6_is_space,
"If true, G6 programmable key sends SPACE instead of F18 (default=true)");
#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);
/**
* cougar_fix_g6_mapping - configure the mapping for key G6/Spacebar
*/
static void cougar_fix_g6_mapping(void)
{
int i;
for (i = 0; cougar_mapping[i][0]; i++) {
if (cougar_mapping[i][0] == COUGAR_KEY_G6) {
cougar_mapping[i][1] =
g6_is_space ? KEY_SPACE : KEY_F18;
pr_info("cougar: G6 mapped to %s\n",
g6_is_space ? "space" : "F18");
return;
}
}
pr_warn("cougar: no mappings 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_or_reset(&hdev->dev, cougar_remove_shared_data, cougar);
if (error) {
mutex_unlock(&cougar_udev_list_lock);
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");
return error;
}
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");
return error;
}
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) {
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) {
/* Preinit the mapping table */
cougar_fix_g6_mapping();
error = hid_hw_open(hdev);
if (error)
goto fail_stop_and_cleanup;
}
return 0;
fail_stop_and_cleanup:
hid_hw_stop(hdev);
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;
struct cougar_shared *shared;
unsigned char code, action;
int i;
cougar = hid_get_drvdata(hdev);
shared = cougar->shared;
if (!cougar->special_intf || !shared)
return 0;
if (!shared->enabled || !shared->input)
return -EPERM;
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(shared->input, EV_KEY,
cougar_mapping[i][1], action);
input_sync(shared->input);
return -EPERM;
}
}
/* Avoid warnings on the same unmapped key twice */
if (action != 0)
hid_warn(hdev, "unmapped special key code %0x: ignoring\n", code);
return -EPERM;
}
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 int cougar_param_set_g6_is_space(const char *val,
const struct kernel_param *kp)
{
int ret;
ret = param_set_bool(val, kp);
if (ret)
return ret;
cougar_fix_g6_mapping();
return 0;
}
static const struct kernel_param_ops cougar_g6_is_space_ops = {
.set = cougar_param_set_g6_is_space,
.get = param_get_bool,
};
module_param_cb(g6_is_space, &cougar_g6_is_space_ops, &g6_is_space, 0644);
static const struct hid_device_id cougar_id_table[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_SOLID_YEAR,
USB_DEVICE_ID_COUGAR_500K_GAMING_KEYBOARD) },
{ HID_USB_DEVICE(USB_VENDOR_ID_SOLID_YEAR,
USB_DEVICE_ID_COUGAR_700K_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);