From patchwork Fri Dec 10 22:10:29 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Charles Mirabile X-Patchwork-Id: 12671003 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B8F62C433F5 for ; Fri, 10 Dec 2021 22:11:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344634AbhLJWPW (ORCPT ); Fri, 10 Dec 2021 17:15:22 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:30438 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344630AbhLJWPV (ORCPT ); Fri, 10 Dec 2021 17:15:21 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1639174305; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=c5UmVaeJrzn3My0B5tFTl1sy/eIwtDufvqirRLuy1LQ=; b=ABAr4CnmTH0I1PnC+Qv7jHHSEBA4Nb+v+VT2Ulod5tQj4d8Pj/wa4F/84pYbwpRxvxd+cY Zxpevg9OrXtZpCxMcKz6QnZBLtC2XxoDuO/sMPubEIGGFHBSBMB+pWN/1HSg6MqrvFTaqu wCjF3Tz8n5SZ33bt1i59ivZAijTyYDc= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-411-yLn7TFRwN5WN6D32BzAqpA-1; Fri, 10 Dec 2021 17:11:40 -0500 X-MC-Unique: yLn7TFRwN5WN6D32BzAqpA-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 61CDF18C8C04; Fri, 10 Dec 2021 22:11:38 +0000 (UTC) Received: from cmirabil.remote.csb (unknown [10.22.8.67]) by smtp.corp.redhat.com (Postfix) with ESMTP id CDFAF694DE; Fri, 10 Dec 2021 22:11:36 +0000 (UTC) From: Charles Mirabile To: linux-kernel@vger.kernel.org Cc: Charles Mirabile , Dmitry Torokhov , linux-input@vger.kernel.org, Serge Schneider , Stefan Wahren , Nicolas Saenz Julienne , Mattias Brugger , linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, fedora-rpi@googlegroups.com, Mwesigwa Guma , Joel Savitz Subject: [PATCH V5 2/6] drivers/input/joystick: sensehat: Raspberry Pi Sense HAT joystick driver Date: Fri, 10 Dec 2021 17:10:29 -0500 Message-Id: <20211210221033.912430-3-cmirabil@redhat.com> In-Reply-To: <20211210221033.912430-1-cmirabil@redhat.com> References: <20211210221033.912430-1-cmirabil@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org This patch implements support for the joystick. It supports left/right/up/down/enter and is attached via i2c and a gpio pin for irq. Signed-off-by: Charles Mirabile Co-developed-by: Mwesigwa Guma Signed-off-by: Mwesigwa Guma Co-developed-by: Joel Savitz Signed-off-by: Joel Savitz --- drivers/input/joystick/Kconfig | 8 ++ drivers/input/joystick/Makefile | 1 + drivers/input/joystick/sensehat-joystick.c | 119 +++++++++++++++++++++ 3 files changed, 128 insertions(+) create mode 100644 drivers/input/joystick/sensehat-joystick.c diff --git a/drivers/input/joystick/Kconfig b/drivers/input/joystick/Kconfig index 3b23078bc7b5..d5c5ffe13903 100644 --- a/drivers/input/joystick/Kconfig +++ b/drivers/input/joystick/Kconfig @@ -399,4 +399,12 @@ config JOYSTICK_N64 Say Y here if you want enable support for the four built-in controller ports on the Nintendo 64 console. +config JOYSTICK_SENSEHAT + tristate "Raspberry Pi Sense HAT joystick" + depends on GPIOLIB && INPUT && I2C + select MFD_SENSEHAT_CORE + + help + This is the joystick driver for the Raspberry Pi Sense HAT + endif diff --git a/drivers/input/joystick/Makefile b/drivers/input/joystick/Makefile index 5174b8aba2dd..39c8b5c6e5ae 100644 --- a/drivers/input/joystick/Makefile +++ b/drivers/input/joystick/Makefile @@ -28,6 +28,7 @@ obj-$(CONFIG_JOYSTICK_N64) += n64joy.o obj-$(CONFIG_JOYSTICK_PSXPAD_SPI) += psxpad-spi.o obj-$(CONFIG_JOYSTICK_PXRC) += pxrc.o obj-$(CONFIG_JOYSTICK_QWIIC) += qwiic-joystick.o +obj-$(CONFIG_JOYSTICK_SENSEHAT) += sensehat-joystick.o obj-$(CONFIG_JOYSTICK_SIDEWINDER) += sidewinder.o obj-$(CONFIG_JOYSTICK_SPACEBALL) += spaceball.o obj-$(CONFIG_JOYSTICK_SPACEORB) += spaceorb.o diff --git a/drivers/input/joystick/sensehat-joystick.c b/drivers/input/joystick/sensehat-joystick.c new file mode 100644 index 000000000000..1f6bb09b4d1f --- /dev/null +++ b/drivers/input/joystick/sensehat-joystick.c @@ -0,0 +1,119 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Raspberry Pi Sense HAT joystick driver + * http://raspberrypi.org + * + * Copyright (C) 2015 Raspberry Pi + * Copyright (C) 2021 Charles Mirabile, Mwesigwa Guma, Joel Savitz + * + * Original Author: Serge Schneider + * Revised for upstream Linux by: Charles Mirabile, Mwesigwa Guma, Joel Savitz + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define SENSEHAT_KEYS 0xF2 + +static int sensehat_get_joystick_state(struct sensehat *sensehat); + +static unsigned char keymap[] = { + KEY_DOWN, KEY_RIGHT, KEY_UP, KEY_ENTER, KEY_LEFT, +}; + +static irqreturn_t sensehat_joystick_report(int n, void *cookie) +{ + int i; + static s32 prev_keys; + struct sensehat *sensehat = cookie; + struct sensehat_joystick *sensehat_joystick = &sensehat->joystick; + s32 keys = sensehat_get_joystick_state(sensehat); + s32 changes = keys ^ prev_keys; + + prev_keys = keys; + for (i = 0; i < ARRAY_SIZE(keymap); ++i) { + if (changes & (1 << i)) { + input_report_key(sensehat_joystick->keys_dev, keymap[i], + keys & (1 << i)); + } + } + input_sync(sensehat_joystick->keys_dev); + return IRQ_HANDLED; +} + +static int sensehat_joystick_probe(struct platform_device *pdev) +{ + int ret; + int i; + struct sensehat *sensehat = dev_get_drvdata(&pdev->dev); + struct sensehat_joystick *sensehat_joystick = &sensehat->joystick; + + sensehat_joystick->keys_dev = devm_input_allocate_device(&pdev->dev); + if (!sensehat_joystick->keys_dev) { + dev_err(&pdev->dev, "Could not allocate input device.\n"); + return -ENOMEM; + } + + for (i = 0; i < ARRAY_SIZE(keymap); i++) { + set_bit(keymap[i], sensehat_joystick->keys_dev->keybit); + } + + sensehat_joystick->keys_dev->name = "Raspberry Pi Sense HAT Joystick"; + sensehat_joystick->keys_dev->phys = "rpi-sense-joy/input0"; + sensehat_joystick->keys_dev->id.bustype = BUS_I2C; + sensehat_joystick->keys_dev->evbit[0] = + BIT_MASK(EV_KEY) | BIT_MASK(EV_REP); + sensehat_joystick->keys_dev->keycode = keymap; + sensehat_joystick->keys_dev->keycodesize = sizeof(unsigned char); + sensehat_joystick->keys_dev->keycodemax = ARRAY_SIZE(keymap); + + ret = input_register_device(sensehat_joystick->keys_dev); + if (ret) { + dev_err(&pdev->dev, "Could not register input device.\n"); + return ret; + } + + ret = devm_request_threaded_irq(&pdev->dev, sensehat->i2c_client->irq, + NULL, sensehat_joystick_report, + IRQF_TRIGGER_RISING | IRQF_ONESHOT, + "keys", sensehat); + + if (ret) { + dev_err(&pdev->dev, "IRQ request failed.\n"); + return ret; + } + return 0; +} + +int sensehat_get_joystick_state(struct sensehat *sensehat) +{ + unsigned int reg; + int ret = regmap_read(sensehat->regmap, SENSEHAT_KEYS, ®); + + return ret < 0 ? ret : reg; +} + +static struct platform_device_id sensehat_joystick_device_id[] = { + { .name = "sensehat-joystick" }, + {}, +}; +MODULE_DEVICE_TABLE(platform, sensehat_joystick_device_id); + +static struct platform_driver sensehat_joystick_driver = { + .probe = sensehat_joystick_probe, + .driver = { + .name = "sensehat-joystick", + }, +}; + +module_platform_driver(sensehat_joystick_driver); + +MODULE_DESCRIPTION("Raspberry Pi Sense HAT joystick driver"); +MODULE_AUTHOR("Serge Schneider "); +MODULE_LICENSE("GPL");