From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 442BFC433FE for ; Tue, 12 Apr 2022 20:17:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=cOWsbwcQKAgtswnslhucKjaQD3sTXoBWV6ns2QcJMOc=; b=edlGlSHd775Ddp 30XC2gkHUUuR7gThTo07XXhbewkjmbIVoE9pGQ32vVoZgBkbaabryPL/w0UWpFRW4kUuGl5Gb4y2X SONVw7sBcpE2EADPs+koFqDd/nLYLTl31gPJIJ2L1IiBI/FEOCi/X1LIYnLdag/n6QUE+iDZN6F5f bBJ0iBCgTAGIqcccR+LRJUhlYpxNQDBeF0a94kt3DvV/uRA4+0g/nfoC0aPe1AySVxsO8jSlSZHMz jAvybFyHXJxma8t5eO45rojMQgyZdgllThDijh7bDrUSt/7jf0BHsjCuJJcofxmX/51qRNTg4vAZN DFCJH+80qwOZbQlBChLw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1neMvv-00Ffpp-Qn; Tue, 12 Apr 2022 20:16:15 +0000 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1neMvb-00Ffjk-Ic for linux-arm-kernel@lists.infradead.org; Tue, 12 Apr 2022 20:15:57 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1649794554; 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=FjswEfzXi7w1n0wExTq7UMdgOf2WX0RDtN6oi5FS6V4=; b=dggZqc1PwxHre/HRgO8J3EwxHyZfvsiykd9OgFbkY3mXd4w3ZDYpCOnS1SXAyqs9zJQfct Gw4oSw4TN9xZcFaWSMAshsx1lUcltl+jkXypNEWWIS86ilNsrn8AoFxLJtchLnDFFdVPGi kJ8/ue4GIihSqi+0nQTwS6M+C8QZq8M= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-369-2nP4A1a0MUSk1KbQv5q10w-1; Tue, 12 Apr 2022 16:14:13 -0400 X-MC-Unique: 2nP4A1a0MUSk1KbQv5q10w-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id AD1101C05B0F; Tue, 12 Apr 2022 20:14:12 +0000 (UTC) Received: from cmirabil.remote.csb (unknown [10.22.32.76]) by smtp.corp.redhat.com (Postfix) with ESMTP id E50BE416363; Tue, 12 Apr 2022 20:14:11 +0000 (UTC) From: Charles Mirabile To: linux-kernel@vger.kernel.org Cc: Charles Mirabile , 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, Miguel Ojeda , Daniel Bauman , Mwesigwa Guma , Joel Savitz Subject: [PATCH v8 3/6] drivers/auxdisplay: sensehat: Raspberry Pi Sense HAT display driver Date: Tue, 12 Apr 2022 16:13:40 -0400 Message-Id: <20220412201343.8074-4-cmirabil@redhat.com> In-Reply-To: <20220412201343.8074-1-cmirabil@redhat.com> References: <20220412201343.8074-1-cmirabil@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.85 on 10.11.54.10 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220412_131555_812628_47A7DAEE X-CRM114-Status: GOOD ( 27.24 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This patch adds the driver for the 8x8 RGB LED matrix display on the Sense HAT. It appears as a character device named sense-hat in /dev/. That special file is 128 bytes large and contains 64 RGB565 triples (2 bytes each) one for each pixel. Co-developed-by: Daniel Bauman Signed-off-by: Daniel Bauman Co-developed-by: Mwesigwa Guma Signed-off-by: Mwesigwa Guma Co-developed-by: Joel Savitz Signed-off-by: Joel Savitz Signed-off-by: Charles Mirabile --- drivers/auxdisplay/Kconfig | 8 + drivers/auxdisplay/Makefile | 1 + drivers/auxdisplay/sensehat-display.c | 205 ++++++++++++++++++++++++++ 3 files changed, 214 insertions(+) create mode 100644 drivers/auxdisplay/sensehat-display.c diff --git a/drivers/auxdisplay/Kconfig b/drivers/auxdisplay/Kconfig index 64012cda4d12..9bad1aade7a0 100644 --- a/drivers/auxdisplay/Kconfig +++ b/drivers/auxdisplay/Kconfig @@ -203,6 +203,14 @@ config ARM_CHARLCD line and the Linux version on the second line, but that's still useful. +config SENSEHAT_DISPLAY + tristate "Raspberry Pi Sense HAT display driver" + depends on I2C + select MFD_SIMPLE_MFD_I2C + help + This is a driver for the Raspberry Pi Sensehat 8x8 RBG-LED matrix + you can access it as a misc device at /dev/sense-hat + menuconfig PARPORT_PANEL tristate "Parallel port LCD/Keypad Panel support" depends on PARPORT diff --git a/drivers/auxdisplay/Makefile b/drivers/auxdisplay/Makefile index 6968ed4d3f0a..30b2b7934046 100644 --- a/drivers/auxdisplay/Makefile +++ b/drivers/auxdisplay/Makefile @@ -14,3 +14,4 @@ obj-$(CONFIG_HT16K33) += ht16k33.o obj-$(CONFIG_PARPORT_PANEL) += panel.o obj-$(CONFIG_LCD2S) += lcd2s.o obj-$(CONFIG_LINEDISP) += line-display.o +obj-$(CONFIG_SENSEHAT_DISPLAY) += sensehat-display.o diff --git a/drivers/auxdisplay/sensehat-display.c b/drivers/auxdisplay/sensehat-display.c new file mode 100644 index 000000000000..9faaee5cde8a --- /dev/null +++ b/drivers/auxdisplay/sensehat-display.c @@ -0,0 +1,205 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Raspberry Pi Sense HAT 8x8 LED matrix display 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 +#include +#include +#include +#include +#include +#include + +#define DISPLAY_SMB_REG 0x00 +#define RGB_555_MASK 0x1f +#define NUM_LEDS 8 +#define NUM_CHANNELS 3 + +struct sensehat_display { + struct platform_device *pdev; + struct miscdevice mdev; + struct mutex rw_mtx; + u8 vmem[NUM_LEDS][NUM_LEDS][NUM_CHANNELS]; + struct regmap *regmap; +}; + +#define VMEM_SIZE sizeof_field(struct sensehat_display, vmem) + + +static int sensehat_update_display(struct sensehat_display *display) +{ + int i, j, k, ret; + u8 buff[NUM_LEDS][NUM_CHANNELS][NUM_LEDS]; + + for (i = 0; i < NUM_LEDS; ++i) + for (j = 0; j < NUM_LEDS; ++j) + for (k = 0; k < NUM_CHANNELS; ++k) + buff[i][k][j] = + display->vmem[i][j][k] & RGB_555_MASK; + + ret = regmap_bulk_write(display->regmap, DISPLAY_SMB_REG, buff, + VMEM_SIZE); + if (ret < 0) + dev_err(&display->pdev->dev, + "Update to 8x8 LED matrix display failed"); + return ret; +} + +static loff_t sensehat_display_llseek(struct file *filp, loff_t offset, + int whence) +{ + return fixed_size_llseek(filp, offset, whence, VMEM_SIZE); +} + +static ssize_t sensehat_display_read(struct file *filp, char __user *buf, + size_t count, loff_t *f_pos) +{ + struct sensehat_display *sensehat_display = + container_of(filp->private_data, struct sensehat_display, mdev); + ssize_t ret = -EFAULT; + + if (*f_pos < 0 || *f_pos >= VMEM_SIZE) + return 0; + count = min_t(size_t, count, VMEM_SIZE - *f_pos); + + if (mutex_lock_interruptible(&sensehat_display->rw_mtx)) + return -ERESTARTSYS; + if (copy_to_user(buf, *f_pos + (u8 *)sensehat_display->vmem, count)) + goto out; + *f_pos += count; + ret = count; +out: + mutex_unlock(&sensehat_display->rw_mtx); + return ret; +} + +static ssize_t sensehat_display_write(struct file *filp, const char __user *buf, + size_t count, loff_t *f_pos) +{ + struct sensehat_display *sensehat_display = + container_of(filp->private_data, struct sensehat_display, mdev); + int ret = -EFAULT; + + if (*f_pos < 0 || *f_pos >= VMEM_SIZE) + return -EFBIG; + count = min_t(size_t, count, VMEM_SIZE - *f_pos); + + if (mutex_lock_interruptible(&sensehat_display->rw_mtx)) + return -ERESTARTSYS; + if (copy_from_user(*f_pos + (u8 *)sensehat_display->vmem, buf, count)) + goto out; + ret = sensehat_update_display(sensehat_display); + if (ret < 0) { + ret = -EIO; + goto out; + } + *f_pos += count; + ret = count; +out: + mutex_unlock(&sensehat_display->rw_mtx); + return ret; +} + +static const struct file_operations sensehat_display_fops = { + .owner = THIS_MODULE, + .llseek = sensehat_display_llseek, + .read = sensehat_display_read, + .write = sensehat_display_write, +}; + +static int sensehat_display_probe(struct platform_device *pdev) +{ + int ret; + + struct sensehat_display *sensehat_display = + devm_kmalloc(&pdev->dev, sizeof(*sensehat_display), GFP_KERNEL); + if (!sensehat_display) + return -ENOMEM; + + sensehat_display->pdev = pdev; + + dev_set_drvdata(&pdev->dev, sensehat_display); + + sensehat_display->regmap = dev_get_regmap(pdev->dev.parent, NULL); + if (!sensehat_display->regmap) { + dev_err(&pdev->dev, + "unable to get sensehat regmap"); + return -ENODEV; + } + + memset(sensehat_display->vmem, 0, VMEM_SIZE); + + mutex_init(&sensehat_display->rw_mtx); + + ret = sensehat_update_display(sensehat_display); + if (ret < 0) { + dev_err(&pdev->dev, + "Could not communicate with sensehat"); + return ret; + } + + sensehat_display->mdev = (struct miscdevice){ + .minor = MISC_DYNAMIC_MINOR, + .name = "sense-hat", + .mode = 0666, + .fops = &sensehat_display_fops, + }; + + ret = misc_register(&sensehat_display->mdev); + if (ret < 0) { + dev_err(&pdev->dev, + "Could not register 8x8 LED matrix display."); + return ret; + } + + dev_info(&pdev->dev, + "8x8 LED matrix display registered with minor number %i", + sensehat_display->mdev.minor); + + return 0; +} + +static int sensehat_display_remove(struct platform_device *pdev) +{ + struct sensehat_display *sensehat_display = dev_get_drvdata(&pdev->dev); + + misc_deregister(&sensehat_display->mdev); + return 0; +} + +static const struct of_device_id sensehat_display_device_id[] = { + { .compatible = "raspberrypi,sensehat-display" }, + {}, +}; +MODULE_DEVICE_TABLE(of, sensehat_display_device_id); + +static struct platform_driver sensehat_display_driver = { + .probe = sensehat_display_probe, + .remove = sensehat_display_remove, + .driver = { + .name = "sensehat-display", + .of_match_table = sensehat_display_device_id, + }, +}; + +module_platform_driver(sensehat_display_driver); + +MODULE_DESCRIPTION("Raspberry Pi Sense HAT 8x8 LED matrix display driver"); +MODULE_AUTHOR("Charles Mirabile "); +MODULE_AUTHOR("Serge Schneider "); +MODULE_LICENSE("GPL"); -- 2.31.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel