From patchwork Wed Feb 23 17:59:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Heiner Kallweit X-Patchwork-Id: 545400 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 31D89C4332F for ; Wed, 23 Feb 2022 18:02:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239746AbiBWSDF (ORCPT ); Wed, 23 Feb 2022 13:03:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32820 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236327AbiBWSDF (ORCPT ); Wed, 23 Feb 2022 13:03:05 -0500 Received: from mail-ed1-x530.google.com (mail-ed1-x530.google.com [IPv6:2a00:1450:4864:20::530]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 452F035856; Wed, 23 Feb 2022 10:02:37 -0800 (PST) Received: by mail-ed1-x530.google.com with SMTP id h15so28484321edv.7; Wed, 23 Feb 2022 10:02:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=message-id:date:mime-version:user-agent:content-language:from:to:cc :references:subject:in-reply-to:content-transfer-encoding; bh=hoJN2xiYRR/AiZH+KyClQAfus1beCOFyquBC28PraRo=; b=BK5rJXWHEtAUExxO90vanXAuMqoIbonOIR0Fe500A/Wi0GoWYYxgDa3IWghcxGlaCA lEgtpUVFe1Rh9cz0ZD1iV9nCsIgHde2IGE5bixRcP61Y89haI6IOO8DkycQarHveeWH6 zoO3+sC4X9et6j+eOY6kKCYiBEGFm0fuIxTDXhvXgphq60t6uYdTp9AhwZJhx3h0xLan Wo5KUbwhFKOaofDSP+O2GHPq/mxIhr6jVquB19CMuwkjV3N2/K1EMR0rmFcywDHZzfQo 7keaLYTqABYT6W83aGQtWFaZtw6g1U7sbT5Iovo/atgRM+3Ui/f7wq36fXhOVfNrQHV9 hYUw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent :content-language:from:to:cc:references:subject:in-reply-to :content-transfer-encoding; bh=hoJN2xiYRR/AiZH+KyClQAfus1beCOFyquBC28PraRo=; b=J4gHLQkS6t28Cf3IA1/E2zw/YUCo+EBTUETHjjc9NZ15mMD1ki3RDPY7gHry5cTgWC pBlwjexL/GwgdMuodbg8QCOKGgEwkRHq/VjvCP1e+vmqj5mr65wjkWDY4C+8H2HmXyGU eyB8XFITm2KWABrGLEBps9pnToq7ge2LXMjnDWAV1W46Ab4NNQLW9WbfjEPBcCDTy7WM +JFbN8IRY781iIF/bg8Vc3y5flHOGjDV6sWbcim8D3sx7IuLZjtjy4nO2RecqC8dTFB0 mag9Re5zWzvuNqvUWjkU3p7qQ0PLT3IiBoKTiK/HZ+tSPKXgq96FgJgaf979+Ujyh17q ctTw== X-Gm-Message-State: AOAM5339InrnjFMM8JCMWrWkFFrIvRicap4/wnQvSZG3eLCudfE4c/t3 RwItoNaQeBTB/NsF5Dihar4= X-Google-Smtp-Source: ABdhPJycAljqrBPqD8wJMoiV0mKJVPvgLcNKwwPiK/7ua7Ct9CK5DDDW+9+DjFMwrvIt2BR8BIn/XQ== X-Received: by 2002:a05:6402:849:b0:412:8cf5:73db with SMTP id b9-20020a056402084900b004128cf573dbmr581155edz.237.1645639355841; Wed, 23 Feb 2022 10:02:35 -0800 (PST) Received: from ?IPV6:2003:ea:8f4d:2b00:d12c:c0a:f603:b44d? 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[2003:ea:8f4d:2b00:d12c:c0a:f603:b44d]) by smtp.googlemail.com with ESMTPSA id k9sm138295eje.202.2022.02.23.10.02.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 23 Feb 2022 10:02:35 -0800 (PST) Message-ID: <2b7f0011-8872-70fa-b9b7-50b7817e7084@gmail.com> Date: Wed, 23 Feb 2022 18:59:31 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.6.1 Content-Language: en-US From: Heiner Kallweit To: Rob Herring , Krzysztof Kozlowski , =?utf-8?q?Andreas_?= =?utf-8?q?F=C3=A4rber?= , Miguel Ojeda Cc: "linux-spi@vger.kernel.org" , "devicetree@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "open list:ARM/Amlogic Meson..." , Jerome Brunet , Martin Blumenstingl , Kevin Hilman , Neil Armstrong , Geert Uytterhoeven References: <4eb7b036-a9b9-3bd2-4e84-f56ba4b1a740@gmail.com> Subject: [PATCH v3 2/5] dt-bindings: auxdisplay: Add Titan Micro Electronics TM1628 In-Reply-To: <4eb7b036-a9b9-3bd2-4e84-f56ba4b1a740@gmail.com> Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Add a YAML schema binding for TM1628 auxdisplay (7/11-segment LED) controller. This patch is partially based on previous work from Andreas Färber . Co-Developed-by: Andreas Färber Signed-off-by: Andreas Färber Co-Developed-by: Heiner Kallweit Signed-off-by: Heiner Kallweit --- v3: - fix remaining YAML issues - use Co-Developed-by --- .../bindings/auxdisplay/titanmec,tm1628.yaml | 92 +++++++++++++++++++ 1 file changed, 92 insertions(+) create mode 100644 Documentation/devicetree/bindings/auxdisplay/titanmec,tm1628.yaml diff --git a/Documentation/devicetree/bindings/auxdisplay/titanmec,tm1628.yaml b/Documentation/devicetree/bindings/auxdisplay/titanmec,tm1628.yaml new file mode 100644 index 000000000..2a1ef692c --- /dev/null +++ b/Documentation/devicetree/bindings/auxdisplay/titanmec,tm1628.yaml @@ -0,0 +1,92 @@ +# SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/auxdisplay/titanmec,tm1628.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Titan Micro Electronics TM1628 LED controller + +maintainers: + - Andreas Färber + - Heiner Kallweit + +allOf: + - $ref: /schemas/spi/spi-peripheral-props.yaml# + +properties: + compatible: + const: titanmec,tm1628 + + reg: + maxItems: 1 + + grid: + description: + Mapping of display digit position to grid number. + This implicitly defines the display size. + $ref: /schemas/types.yaml#/definitions/uint8-array + minItems: 1 + maxItems: 7 + + segment-mapping: + description: + Mapping of 7 segment display segments A-G to bit numbers 1-12. + $ref: /schemas/types.yaml#/definitions/uint8-array + minItems: 7 + maxItems: 7 + + "#address-cells": + const: 2 + + "#size-cells": + const: 0 + +required: + - compatible + - reg + +patternProperties: + "^.*@[1-7],([1-9]|1[0-6])$": + type: object + $ref: /schemas/leds/common.yaml# + unevaluatedProperties: false + description: | + Properties for a single LED. + + properties: + reg: + description: | + 1-based grid number, followed by 1-based segment bit number. + maxItems: 1 + + required: + - reg + +unevaluatedProperties: false + +examples: + - | + #include + + spi { + #address-cells = <1>; + #size-cells = <0>; + + led-controller@0 { + compatible = "titanmec,tm1628"; + reg = <0>; + spi-3-wire; + spi-lsb-first; + spi-max-frequency = <500000>; + grid = /bits/ 8 <4 3 2 1>; + segment-mapping = /bits/ 8 <4 5 6 1 2 3 7>; + #address-cells = <2>; + #size-cells = <0>; + + alarmn@5,4 { + reg = <5 4>; + function = LED_FUNCTION_ALARM; + }; + }; + }; +... From patchwork Wed Feb 23 18:01:25 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Heiner Kallweit X-Patchwork-Id: 545399 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 2EEEEC4332F for ; Wed, 23 Feb 2022 18:02:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243318AbiBWSDJ (ORCPT ); Wed, 23 Feb 2022 13:03:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32860 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236327AbiBWSDJ (ORCPT ); Wed, 23 Feb 2022 13:03:09 -0500 Received: from mail-ed1-x529.google.com (mail-ed1-x529.google.com [IPv6:2a00:1450:4864:20::529]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 31C8535856; Wed, 23 Feb 2022 10:02:40 -0800 (PST) Received: by mail-ed1-x529.google.com with SMTP id x5so45385460edd.11; Wed, 23 Feb 2022 10:02:40 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=message-id:date:mime-version:user-agent:subject:content-language :from:to:cc:references:in-reply-to:content-transfer-encoding; bh=Ztn66s8SUIz5OHyMtEBe1Xe+BpLfxyrPhcK5hTUQv6A=; b=hg3zswjDrjGpnWRRCkwm+iKFJOGhfqIICQNAM7LiCQplqqGqf69Fy8D2AaOAcU5tO8 uTpay3YgvFx510i+PZH8iXyC2wXBTJWoWrtfJzWw5embztMJC33dcUhVOszvkthmnqGT jM/lJg+oVDEmEFtl6JBULpGVT4te3cjE/EIeUADjdmeGcH7Y2o11hLQj8h8mSCwSjI4q iJBWwvMqazcHoPF7d5vlXCZKU6yKFYpVVC3sg5Q/Nnjkvx3b7WPXcv8jFs6MeUMzkHei iGkg+3z3i4rBocabG8xTnAVG2yiiPuMwL9tfB/q124PH6yWhvMkW/s0bdKnPtc2IV7dz tZpQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent:subject :content-language:from:to:cc:references:in-reply-to :content-transfer-encoding; bh=Ztn66s8SUIz5OHyMtEBe1Xe+BpLfxyrPhcK5hTUQv6A=; b=Fy2feVaTgKXkMrjQJjjzvV/2Fx23fnRkpVP+MzOUkq2QofSNVYf6WyphL3VYvFlMMv is1zVGt+B7azU3ePJK9ePCE26f4bQYxhgsig3zeOTvGzZVegdbQMt/anfeG6ar3WRkge OkL6rZCtIKqgELeqHURjlvBtyyEebXoa/2x852QPJ0T6duMcK+gOdVbgH2SPMGj0UMMR U/HxnRIDK7qDSpd/F3IPSwkbaT1b7G0y5dkC/yDF1meoWDvjpCjf3/CIE7IbaHBQI5s8 FBp4MUmSH3bHGsAhM6Eg/sgn7ywcSqbcm+ntsHu4EIH1oOrrC/54RyjyqtfWJH6DYT7A bB5g== X-Gm-Message-State: AOAM5304ISYmLv4RrgAM8TfsbqynPU55iBj1PBF531BeXUFCYgmWIXZ7 qkkIw9eufDr7NpTRb+gAdyk= X-Google-Smtp-Source: ABdhPJywe7V/TXkcqp4ZQnIGXHP/hDqDd0Eiux4ih48yeoNfn6sOYfUhv6ReSlNnnAdgxD7Z2yaRTg== X-Received: by 2002:a05:6402:cac:b0:410:a920:4e90 with SMTP id cn12-20020a0564020cac00b00410a9204e90mr626157edb.60.1645639358677; Wed, 23 Feb 2022 10:02:38 -0800 (PST) Received: from ?IPV6:2003:ea:8f4d:2b00:d12c:c0a:f603:b44d? 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[2003:ea:8f4d:2b00:d12c:c0a:f603:b44d]) by smtp.googlemail.com with ESMTPSA id qq1sm137210ejb.200.2022.02.23.10.02.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 23 Feb 2022 10:02:38 -0800 (PST) Message-ID: <944317db-b659-cb36-addf-c33623a4ff60@gmail.com> Date: Wed, 23 Feb 2022 19:01:25 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.6.1 Subject: [PATCH v3 4/5] auxdisplay: add support for Titanmec TM1628 7 segment display controller Content-Language: en-US From: Heiner Kallweit To: Rob Herring , Krzysztof Kozlowski , =?utf-8?q?Andreas_?= =?utf-8?q?F=C3=A4rber?= , Miguel Ojeda Cc: "linux-spi@vger.kernel.org" , "devicetree@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "open list:ARM/Amlogic Meson..." , Jerome Brunet , Martin Blumenstingl , Kevin Hilman , Neil Armstrong , Geert Uytterhoeven References: <4eb7b036-a9b9-3bd2-4e84-f56ba4b1a740@gmail.com> In-Reply-To: <4eb7b036-a9b9-3bd2-4e84-f56ba4b1a740@gmail.com> Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org This patch adds support for the Titanmec TM1628 7 segment display controller. It's based on previous RFC work from Andreas Färber. The RFC version placed the driver in the LED subsystem, but this was NAK'ed by the LED maintainer. Therefore I moved the driver to /drivers/auxdisplay what seems most reasonable to me. Further changes to the RFC version: - Driver can be built also w/o LED class support, for displays that don't have any symbols to be exposed as LED's. - Simplified the code and rewrote a lot of it. - Driver is now kind of a MVP, but functionality should be sufficient for most use cases. - Use the existing 7 segment support in uapi/linux/map_to_7segment.h as suggested by Geert Uytterhoeven. Note: There's a number of chips from other manufacturers that are almost identical, e.g. FD628, SM1628. Only difference I saw so far is that they partially support other display modes. TM1628: 6x12, 7x11 SM1628C: 4x13, 5x12, 6x11, 7x10 For typical displays on devices using these chips this difference shouldn't matter. Successfully tested on a TX3 Mini TV box that has an SM1628C and a display with 4 digits and 7 symbols. Co-Developed-by: Andreas Färber Signed-off-by: Andreas Färber Co-Developed-by: Heiner Kallweit Signed-off-by: Heiner Kallweit --- v3: - use Co-Developed-by --- drivers/auxdisplay/Kconfig | 10 + drivers/auxdisplay/Makefile | 1 + drivers/auxdisplay/tm1628.c | 376 ++++++++++++++++++++++++++++++++++++ 3 files changed, 387 insertions(+) create mode 100644 drivers/auxdisplay/tm1628.c diff --git a/drivers/auxdisplay/Kconfig b/drivers/auxdisplay/Kconfig index 64012cda4..25ef2e452 100644 --- a/drivers/auxdisplay/Kconfig +++ b/drivers/auxdisplay/Kconfig @@ -203,6 +203,16 @@ config ARM_CHARLCD line and the Linux version on the second line, but that's still useful. +config TM1628 + tristate "TM1628 driver for LED 7/11 segment displays" + depends on SPI + depends on OF || COMPILE_TEST + help + Say Y to enable support for Titan Micro Electronics TM1628 + LED controller. + It's a 3-wire SPI device controlling a two-dimensional grid of + LEDs. Dimming is applied to all outputs through an internal PWM. + menuconfig PARPORT_PANEL tristate "Parallel port LCD/Keypad Panel support" depends on PARPORT diff --git a/drivers/auxdisplay/Makefile b/drivers/auxdisplay/Makefile index 6968ed4d3..7728e17e1 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_TM1628) += tm1628.o diff --git a/drivers/auxdisplay/tm1628.c b/drivers/auxdisplay/tm1628.c new file mode 100644 index 000000000..b802b5c30 --- /dev/null +++ b/drivers/auxdisplay/tm1628.c @@ -0,0 +1,376 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Titan Micro Electronics TM1628 LED controller + * + * Copyright (c) 2019 Andreas Färber + */ + +#include +#include +#include +#include +#include +#include +#include + +#define TM1628_CMD_DISPLAY_MODE (0 << 6) +#define TM1628_DISPLAY_MODE_6_12 0x02 +#define TM1628_DISPLAY_MODE_7_11 0x03 + +#define TM1628_CMD_DATA (1 << 6) +#define TM1628_DATA_TEST_MODE BIT(3) +#define TM1628_DATA_FIXED_ADDR BIT(2) +#define TM1628_DATA_WRITE_DATA 0x00 +#define TM1628_DATA_READ_DATA 0x02 + +#define TM1628_CMD_DISPLAY_CTRL (2 << 6) +#define TM1628_DISPLAY_CTRL_DISPLAY_ON BIT(3) + +#define TM1628_CMD_SET_ADDRESS (3 << 6) + +#define TM1628_BRIGHTNESS_MAX 7 + +/* Physical limits, depending on the mode the chip may support less */ +#define MAX_GRID_SIZE 7 +#define MAX_SEGMENT_NUM 16 + +struct tm1628_led { + struct led_classdev leddev; + struct tm1628 *ctrl; + u32 grid; + u32 seg; +}; + +struct tm1628 { + struct spi_device *spi; + __le16 data[MAX_GRID_SIZE]; + struct mutex disp_lock; + char text[MAX_GRID_SIZE + 1]; + u8 segment_mapping[7]; + u8 grid[MAX_GRID_SIZE]; + int grid_size; + struct tm1628_led leds[]; +}; + +/* Command 1: Display Mode Setting */ +static int tm1628_set_display_mode(struct spi_device *spi, u8 grid_mode) +{ + u8 cmd = TM1628_CMD_DISPLAY_MODE | grid_mode; + + return spi_write(spi, &cmd, 1); +} + +/* Command 3: Address Setting */ +static int tm1628_set_address(struct spi_device *spi, u8 offset) +{ + u8 cmd = TM1628_CMD_SET_ADDRESS | (offset * sizeof(__le16)); + + return spi_write(spi, &cmd, 1); +} + +/* Command 2: Data Setting */ +static int tm1628_write_data(struct spi_device *spi, unsigned int offset, + unsigned int len) +{ + struct tm1628 *s = spi_get_drvdata(spi); + u8 cmd = TM1628_CMD_DATA | TM1628_DATA_WRITE_DATA; + struct spi_transfer xfers[] = { + { + .tx_buf = &cmd, + .len = 1, + }, + { + .tx_buf = (__force void *)(s->data + offset), + .len = len * sizeof(__le16), + }, + }; + + if (offset + len > MAX_GRID_SIZE) { + dev_err(&spi->dev, "Invalid data address offset %u len %u\n", + offset, len); + return -EINVAL; + } + + tm1628_set_address(spi, offset); + + return spi_sync_transfer(spi, xfers, ARRAY_SIZE(xfers)); +} + +/* Command 4: Display Control */ +static int tm1628_set_display_ctrl(struct spi_device *spi, bool on) +{ + u8 cmd = TM1628_CMD_DISPLAY_CTRL | TM1628_BRIGHTNESS_MAX; + + if (on) + cmd |= TM1628_DISPLAY_CTRL_DISPLAY_ON; + + return spi_write(spi, &cmd, 1); +} + +static int tm1628_show_text(struct tm1628 *s) +{ + static SEG7_CONVERSION_MAP(map_seg7, MAP_ASCII7SEG_ALPHANUM); + int i, ret; + + int msg_len = strlen(s->text); + + mutex_lock(&s->disp_lock); + + for (i = 0; i < s->grid_size; i++) { + int pos = s->grid[i] - 1; + + if (i < msg_len) { + int char7_raw = map_to_seg7(&map_seg7, s->text[i]); + int j, char7; + + for (j = 0, char7 = 0; j < 7; j++) { + if (char7_raw & BIT(j)) + char7 |= BIT(s->segment_mapping[j] - 1); + } + + s->data[pos] = cpu_to_le16(char7); + } else { + s->data[pos] = 0; + } + } + + ret = tm1628_write_data(s->spi, 0, s->grid_size); + + mutex_unlock(&s->disp_lock); + + return ret; +} + +static int tm1628_led_set_brightness(struct led_classdev *led_cdev, + enum led_brightness brightness) +{ + struct tm1628_led *led = container_of(led_cdev, struct tm1628_led, leddev); + struct tm1628 *s = led->ctrl; + int offset, ret; + __le16 bit; + + offset = led->grid - 1; + bit = cpu_to_le16(BIT(led->seg - 1)); + + mutex_lock(&s->disp_lock); + + if (brightness == LED_OFF) + s->data[offset] &= ~bit; + else + s->data[offset] |= bit; + + ret = tm1628_write_data(s->spi, offset, 1); + + mutex_unlock(&s->disp_lock); + + return ret; +} + +static enum led_brightness tm1628_led_get_brightness(struct led_classdev *led_cdev) +{ + struct tm1628_led *led = container_of(led_cdev, struct tm1628_led, leddev); + struct tm1628 *s = led->ctrl; + int offset; + __le16 bit; + bool on; + + offset = led->grid - 1; + bit = cpu_to_le16(BIT(led->seg - 1)); + + mutex_lock(&s->disp_lock); + on = s->data[offset] & bit; + mutex_unlock(&s->disp_lock); + + return on ? LED_ON : LED_OFF; +} + +static int tm1628_register_led(struct tm1628 *s, struct fwnode_handle *node, + u32 grid, u32 seg, struct tm1628_led *led) +{ + struct device *dev = &s->spi->dev; + struct led_init_data init_data = { .fwnode = node }; + + led->ctrl = s; + led->grid = grid; + led->seg = seg; + led->leddev.max_brightness = LED_ON; + led->leddev.brightness_set_blocking = tm1628_led_set_brightness; + led->leddev.brightness_get = tm1628_led_get_brightness; + + return devm_led_classdev_register_ext(dev, &led->leddev, &init_data); +} + +static ssize_t display_text_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct tm1628 *s = dev_get_drvdata(dev); + + return sysfs_emit(buf, "%s\n", s->text); +} + +static ssize_t display_text_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct tm1628 *s = dev_get_drvdata(dev); + int ret, i; + + if (count > s->grid_size + 1) /* consider trailing newline */ + return -E2BIG; + + for (i = 0; i < count && isprint(buf[i]); i++) + s->text[i] = buf[i]; + + s->text[i] = '\0'; + + ret = tm1628_show_text(s); + if (ret < 0) + return ret; + + return count; +} + +static const DEVICE_ATTR_RW(display_text); + +static int tm1628_spi_probe(struct spi_device *spi) +{ + struct fwnode_handle *child; + unsigned int num_leds; + struct tm1628 *s; + int ret, i; + + num_leds = device_get_child_node_count(&spi->dev); + + s = devm_kzalloc(&spi->dev, struct_size(s, leds, num_leds), GFP_KERNEL); + if (!s) + return -ENOMEM; + + s->spi = spi; + spi_set_drvdata(spi, s); + + mutex_init(&s->disp_lock); + + msleep(200); /* according to TM1628 datasheet */ + + /* clear screen */ + ret = tm1628_write_data(spi, 0, MAX_GRID_SIZE); + if (ret) + return ret; + /* Assume that subsequent SPI transfers will be ok if first was ok */ + + /* For now we support 6x12 mode only. This should be sufficient for most use cases */ + tm1628_set_display_mode(spi, TM1628_DISPLAY_MODE_6_12); + + tm1628_set_display_ctrl(spi, true); + + if (!IS_REACHABLE(CONFIG_LEDS_CLASS)) + goto no_leds; + + num_leds = 0; + + device_for_each_child_node(&spi->dev, child) { + u32 reg[2]; + + ret = fwnode_property_read_u32_array(child, "reg", reg, 2); + if (ret) { + dev_err(&spi->dev, "Reading %s reg property failed (%d)\n", + fwnode_get_name(child), ret); + continue; + } + + if (reg[0] == 0 || reg[0] > MAX_GRID_SIZE) { + dev_err(&spi->dev, "Invalid grid %u at %s\n", + reg[0], fwnode_get_name(child)); + continue; + } + + if (reg[1] == 0 || reg[1] > MAX_SEGMENT_NUM) { + dev_err(&spi->dev, "Invalid segment %u at %s\n", + reg[1], fwnode_get_name(child)); + continue; + } + + ret = tm1628_register_led(s, child, reg[0], reg[1], s->leds + num_leds); + if (ret) { + dev_err(&spi->dev, "Failed to register LED %s (%d)\n", + fwnode_get_name(child), ret); + continue; + } + num_leds++; + } + +no_leds: + ret = device_property_count_u8(&spi->dev, "grid"); + if (ret < 1 || ret > MAX_GRID_SIZE) { + dev_err(&spi->dev, "Invalid display length (%d)\n", ret); + return -EINVAL; + } + + s->grid_size = ret; + + ret = device_property_read_u8_array(&spi->dev, "grid", s->grid, s->grid_size); + if (ret < 0) + return ret; + + for (i = 0; i < s->grid_size; i++) { + if (s->grid[i] < 1 || s->grid[i] > s->grid_size) + return -EINVAL; + } + + ret = device_property_read_u8_array(&spi->dev, "segment-mapping", s->segment_mapping, 7); + if (ret < 0) + return ret; + + for (i = 0; i < 7; i++) { + if (s->segment_mapping[i] < 1 || s->segment_mapping[i] > MAX_SEGMENT_NUM) + return -EINVAL; + } + + ret = device_create_file(&spi->dev, &dev_attr_display_text); + if (ret) + return ret; + + dev_info(&spi->dev, "Configured display with %u digits and %u symbols\n", + s->grid_size, num_leds); + + return 0; +} + +static void tm1628_spi_remove(struct spi_device *spi) +{ + device_remove_file(&spi->dev, &dev_attr_display_text); + tm1628_set_display_ctrl(spi, false); +} + +static void tm1628_spi_shutdown(struct spi_device *spi) +{ + tm1628_set_display_ctrl(spi, false); +} + +static const struct of_device_id tm1628_spi_of_matches[] = { + { .compatible = "titanmec,tm1628" }, + {} +}; +MODULE_DEVICE_TABLE(of, tm1628_spi_of_matches); + +static const struct spi_device_id tm1628_spi_id_table[] = { + { "tm1628" }, + {}, +}; +MODULE_DEVICE_TABLE(spi, tm1628_spi_id_table); + +static struct spi_driver tm1628_spi_driver = { + .probe = tm1628_spi_probe, + .remove = tm1628_spi_remove, + .shutdown = tm1628_spi_shutdown, + .id_table = tm1628_spi_id_table, + + .driver = { + .name = "tm1628", + .of_match_table = tm1628_spi_of_matches, + }, +}; +module_spi_driver(tm1628_spi_driver); + +MODULE_DESCRIPTION("TM1628 LED controller driver"); +MODULE_AUTHOR("Andreas Färber"); +MODULE_LICENSE("GPL");