From patchwork Wed Jul 14 15:11:11 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 12377205 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 616C0C11F7E for ; Wed, 14 Jul 2021 15:12:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 487AF613F1 for ; Wed, 14 Jul 2021 15:12:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239703AbhGNPOu (ORCPT ); Wed, 14 Jul 2021 11:14:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42438 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239786AbhGNPOm (ORCPT ); Wed, 14 Jul 2021 11:14:42 -0400 Received: from xavier.telenet-ops.be (xavier.telenet-ops.be [IPv6:2a02:1800:120:4::f00:14]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5CBA5C0613AF for ; Wed, 14 Jul 2021 08:11:43 -0700 (PDT) Received: from ramsan.of.borg ([IPv6:2a02:1810:ac12:ed10:bcf3:b2b1:dff6:480b]) by xavier.telenet-ops.be with bizsmtp id V3Be2500U4sai0K013Bf51; Wed, 14 Jul 2021 17:11:41 +0200 Received: from rox.of.borg ([192.168.97.57]) by ramsan.of.borg with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.93) (envelope-from ) id 1m3gXy-001ARB-Lo; Wed, 14 Jul 2021 17:11:38 +0200 Received: from geert by rox.of.borg with local (Exim 4.93) (envelope-from ) id 1m3gXx-00Acf3-0N; Wed, 14 Jul 2021 17:11:37 +0200 From: Geert Uytterhoeven To: Robin van der Gracht , Rob Herring , Miguel Ojeda , Paul Burton , Greg Kroah-Hartman , Pavel Machek , Marek Behun Cc: devicetree@vger.kernel.org, linux-leds@vger.kernel.org, linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH v3 00/19] auxdisplay: ht16k33: Add character display support Date: Wed, 14 Jul 2021 17:11:11 +0200 Message-Id: <20210714151130.2531831-1-geert@linux-m68k.org> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Hi all, The Holtek HT16K33 LED controller is not only used for driving dot-matrix displays, but also for driving segment displays. The current auxdisplay driver is limited to dot-matrix displays, which are exposed as a frame buffer device. This patch series extends the driver to 4-digit 7-segment and quad 14-segment alphanumeric displays, allowing the user to display and scroll text messages. List of patches: - Patch 1 provides font data for displaying ASCII characters on 14-segment displays, - Patch 2 updates the HT16K33 DT bindings for segment displays, - Patches 3-5 contain a bug fix and small improvements for the Imagination Technologies ASCII LCD Display driver, - Patch 6 extracts the character line display core support from the Imagination Technologies ASCII LCD Display driver, for reuse, - Patches 7-8 contain cleanups and improvements for the character line display core driver, - Patches 9-16 contain a bug fix, cleanups and improvements for the HT16K33 driver, to prepare for segment display support, - Patch 17 adds support for 7/14-segment displays to the HT16K33 driver, - Patch 18 updates the HT16K33 DT bindings to document an LED subnode, - Patch 19 adds segment display LED support to the HT16K33 driver, to make use of hardware blinking, and to expose display color. Changes compared to v2[1]: - Drop color property from display node, - Use compat_only_sysfs_link_entry_to_kobj() instead of cooking our own helper on top of kernfs_create_link(), - Use "err" instead of "error" to be consistent with existing driver naming style, - Pass "dev" instead of "client" to ht16k33_fbdev_probe() and ht16k33_seg_probe(), - Drop local variable "node", - Remove unneeded inclusion of and , - Document LED subnode, - Remove unneeded C++ comment, - Make the creation of the LED device dependent on the presence of the "led" subnode in DT, so it can be used in dot-matrix mode too. - Use led_init_data() and devm_led_classdev_register_ext() to retrieve all LED properties from DT, instead of manual LED name construction based on just the "color" property, Changes compared to v1[2]: - Fix type of color to uint32, - "refresh-rate-hz" is still required for dot-matrix displays. - Move "select LINEDISP" for HT16K33 symbol to correct patch, - Add backwards compatibility "message" symlink to img-ascii-lcd, - Connect backlight to fbdev in ht16k33 dot-matrix mode, - Set "err = -EINVAL" in switch() case that cannot happen, - Use "auxdisplay" instead of DRIVER_NAME in LED name. This series has been tested using an Adafruit 0.54" Quad Alphanumeric Red FeatherWing Display, plugged into an OrangeCrab ECP5-based FPGA board running linux-on-litex-vexriscv. 7-segment display support is based purely on schematics, and has not been tested on actual hardware. The changes to img-ascii-lcd.c are also untested, due to lack of hardware. Thanks! [1] "[PATCH v2 00/18] auxdisplay: ht16k33: Add character display support" https://lore.kernel.org/r/20210625125902.1162428-1-geert@linux-m68k.org/ [2] "[PATCH 00/17] auxdisplay: ht16k33: Add character display support" https://lore.kernel.org/r/20210322144848.1065067-1-geert@linux-m68k.org/ Geert Uytterhoeven (19): uapi: Add dt-bindings: auxdisplay: ht16k33: Document Adafruit segment displays auxdisplay: img-ascii-lcd: Fix lock-up when displaying empty string auxdisplay: img-ascii-lcd: Add helper variable dev auxdisplay: img-ascii-lcd: Convert device attribute to sysfs_emit() auxdisplay: Extract character line display core support auxdisplay: linedisp: Use kmemdup_nul() helper auxdisplay: linedisp: Add support for changing scroll rate auxdisplay: ht16k33: Connect backlight to fbdev auxdisplay: ht16k33: Use HT16K33_FB_SIZE in ht16k33_initialize() auxdisplay: ht16k33: Remove unneeded error check in keypad probe() auxdisplay: ht16k33: Convert to simple i2c probe function auxdisplay: ht16k33: Add helper variable dev auxdisplay: ht16k33: Move delayed work auxdisplay: ht16k33: Extract ht16k33_brightness_set() auxdisplay: ht16k33: Extract frame buffer probing auxdisplay: ht16k33: Add support for segment displays dt-bindings: auxdisplay: ht16k33: Document LED subnode auxdisplay: ht16k33: Add LED support .../bindings/auxdisplay/holtek,ht16k33.yaml | 33 +- drivers/auxdisplay/Kconfig | 8 + drivers/auxdisplay/Makefile | 1 + drivers/auxdisplay/ht16k33.c | 473 ++++++++++++++---- drivers/auxdisplay/img-ascii-lcd.c | 205 ++------ drivers/auxdisplay/line-display.c | 261 ++++++++++ drivers/auxdisplay/line-display.h | 43 ++ include/uapi/linux/map_to_14segment.h | 239 +++++++++ 8 files changed, 996 insertions(+), 267 deletions(-) create mode 100644 drivers/auxdisplay/line-display.c create mode 100644 drivers/auxdisplay/line-display.h create mode 100644 include/uapi/linux/map_to_14segment.h