From patchwork Sun Dec 3 12:50:19 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wei Shuai X-Patchwork-Id: 13477308 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="RVxXNc1f" Received: from mail-lf1-x12e.google.com (mail-lf1-x12e.google.com [IPv6:2a00:1450:4864:20::12e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 81518C2; Sun, 3 Dec 2023 04:50:35 -0800 (PST) Received: by mail-lf1-x12e.google.com with SMTP id 2adb3069b0e04-50bf5398755so13770e87.0; Sun, 03 Dec 2023 04:50:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1701607834; x=1702212634; darn=vger.kernel.org; h=to:subject:message-id:date:from:mime-version:from:to:cc:subject :date:message-id:reply-to; bh=N+T2khgtXnTEu6PTq9Za/aCSsZG0UtepvpPeYmqH1AI=; b=RVxXNc1fVU30OByHtwm1C+ynk/77NbMJ4H8aC9mYE4fOpsxT54uXOa5PdrS4vWezSi J+/8RwyYMx6O/5iVuICXTkdZkKPNDk5+DCKlRUbKqWSJHoQA7ryEQ0Ix92QBZBBse+DI x75RIgMA3NxQzdTmNPyvGEjmqAHUZBIT7Sf3UiklvdJF6iGbjFVKxBvbOfAjT00AcMps pde/G0wjzoUjLcThzJL9fLGyxV+Xm/qcCPulDBHFMdHKuPZnqmDaP+6nmrvpn4zDD7GZ b+boXf9XKNMUaeNgTCDn918i6IotMY+d6koFc+Y6KibrMN1HPeSW+oaYLcgY3HvBBCma TfgQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701607834; x=1702212634; h=to:subject:message-id:date:from:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=N+T2khgtXnTEu6PTq9Za/aCSsZG0UtepvpPeYmqH1AI=; b=f+uieW5JM5/e0krK4vtz6LSU/+sDyWK6FvJI1wdAOXf6xNrTUsgYqWaZJq2WJF8kBT 0f7r836qSXs5D8D/ZaG8x3IAEJcCrLirXSyl/Cf9Uq9zNGALZv/EoPqWRUdJVfhFlIjp GN/j5svetAhnxciCOvFCTnIdG63ryeYZ6f8CxHCFT4zdjQ6PceZW0TDAwiWODCK7Ws2r EabakvpAKpAEixZKD8cUgGGlzYU6RJnd7RZQpjWZPdNY7p9kaYwiDsUfojsWGDT7UdiC kVdUL1UD+Q4hDyapNdlr6EI4XZYGWRD3aBYlblO+d2krmd42Mkru9m42M0oxxptc5gx9 HVXA== X-Gm-Message-State: AOJu0YzbLaZ1B+kkKTx2Qyh35AdLcO3Xu18xO5F6zw3rqdtLowIoqLIK jFgk8bPnYXe8bO3AAmZMPXAVdcWDNWMLHSpR42polp+9cFIn40LyNSI= X-Google-Smtp-Source: AGHT+IFnBM5d3SM2ajAzeiu42JMgrWc7/49n6/x5LcR4l3UNcxplNKnyBhTo2MOka2C4MuZivEPNOf37cl+tQSEfnLw= X-Received: by 2002:a05:6512:3c99:b0:50b:ed57:7597 with SMTP id h25-20020a0565123c9900b0050bed577597mr1969122lfv.4.1701607833092; Sun, 03 Dec 2023 04:50:33 -0800 (PST) Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Wei Shuai Date: Sun, 3 Dec 2023 20:50:19 +0800 Message-ID: Subject: [PATCH] Input: expand keycode space To: Dmitry Torokhov , "open list:INPUT (KEYBOARD, MOUSE, JOYSTICK, TOUCHSCREEN)..." , open list Dear Dmitry Torokhov, Today I found out that in 2008, you have expanded the number of potential key codes from 512 to 768. I request to expand keycode space again, from 0x2ff to 0x4ff. I have tested this patch on Ubuntu Kernel, it works well with a USB HID joystick that has more than 80 keys. Story back to I found Linux kernel has max USB HID joystick buttons up to 80, no more. But Windows OS and Mac OS have no such limitations. I have a USB HID joystick device, which has 104 buttons, larger than 80. I did a lot of google search, but nothing I got. then I have to look at Kernel source, to find out where this number max 80 comes from Eventually, I found the final limitation #define BTN_JOYSTICK 0x120 #define BTN_DEAD 0x12f #define BTN_TRIGGER_HAPPY 0x2c0 #define KEY_MAX 0x2ff include/uapi/linux/input-event-codes.h according to function hidinput_configure_usage() in file drivers/hid/hid-input.c the USB joystick button mapping is not a continuous space, generally speak the mapping space is from BTN_JOYSTICK~BTN_DEAD 0x120~0x12f=0x10 BTN_TRIGGER_HAPPY~KEY_MAX 0x2c0~0x2ff=40 0x10+0x40=0x60=80 and finally, I got the max limitation of 80 for joystick keys. This patch is about expanding keycode space from 0x2ff to 0x4ff. I expect this patch won't go with ease, because it affects user space application definition as well. I believe sooner or later Linux kernel will face keycode is not enough Signed-off-by: Wei Shuai --- include/linux/mod_devicetable.h | 2 +- include/uapi/linux/input-event-codes.h | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) -- 2.17.1 diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h index 8d764aab29de..35eb59ae1f19 100644 --- a/include/linux/mod_devicetable.h +++ b/include/linux/mod_devicetable.h @@ -311,7 +311,7 @@ struct pcmcia_device_id { /* Input */ #define INPUT_DEVICE_ID_EV_MAX 0x1f #define INPUT_DEVICE_ID_KEY_MIN_INTERESTING 0x71 -#define INPUT_DEVICE_ID_KEY_MAX 0x2ff +#define INPUT_DEVICE_ID_KEY_MAX 0x4ff #define INPUT_DEVICE_ID_REL_MAX 0x0f #define INPUT_DEVICE_ID_ABS_MAX 0x3f #define INPUT_DEVICE_ID_MSC_MAX 0x07 diff --git a/include/uapi/linux/input-event-codes.h b/include/uapi/linux/input-event-codes.h index b6a835d37826..ad1b9bed3828 100644 --- a/include/uapi/linux/input-event-codes.h +++ b/include/uapi/linux/input-event-codes.h @@ -774,7 +774,7 @@ /* We avoid low common keys in module aliases so they don't get huge. */ #define KEY_MIN_INTERESTING KEY_MUTE -#define KEY_MAX 0x2ff +#define KEY_MAX 0x4ff #define KEY_CNT (KEY_MAX+1) /*