From nobody Thu Dec 18 16:51:57 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BAA8212FF63; Wed, 19 Jun 2024 11:49:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718797740; cv=none; b=B3WwgjAMEWTVtS8KNqzM64HBZxCSk2c6ZiN0PElTUuia1B83pGkfhyHCeDJDEhriWMsbUyqn91+y8SEk+SVe4wZg6EHMx92gDJFedq0WnAImbdz9hPHVF1dB8Dk0+rEjBFkEdTpVLlRibHW2mlSJ+0hwWlaJ6RhsUFIt1TnrpFI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718797740; c=relaxed/simple; bh=Y7d6YCxPwQw2LEZebDL8fVcGc333N+fJnoUOBHGjuJw=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:To:Cc; b=u5iMOeWwo4IPP8F2QRlYyFo/xMQ+zGfotdQfeI3Fn8Dn5Ie1Z5rkKsm0sSGW1ed+CelP2mFiNhkdF6czIktFh+ZFDtwMgEA+UfavbrwM0HZtQEXhNdxisRE5d8PaJEgVUr/i64ddgxzi8Ap2noByshYMu+gbBP3IgznBgzznQAk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=dvO0af2X; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="dvO0af2X" Received: by smtp.kernel.org (Postfix) with ESMTPS id 55C37C2BBFC; Wed, 19 Jun 2024 11:49:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1718797740; bh=Y7d6YCxPwQw2LEZebDL8fVcGc333N+fJnoUOBHGjuJw=; h=From:Date:Subject:To:Cc:Reply-To:From; b=dvO0af2XAaBiJgFosEUfAqyY/EZJbjGdoqcPfzFDHsVnbQPvbz/UkM/fLSO7IpuKf p21SsLOnybSZ8PreOsiz+N0gfPfV/VlKlMwFBxHxyYYaCli6Acr7UuUcPvBUVhAH3J Pp67Xcx1BBpoxB9Vx9vHEMkdodkRczgmVmGSH6n11DNV33/MopdH4On7RciCDlG9WI rW9LslNZcLDsOOlS1syDdoFZ1o+Mt85dchiZG56yhXJwrqZW1F5cssvnvc4JIU7C+o v0P/NxmTcbu/27d/oyn+CFav+opuBf9gf9syDIxdM2hg4RdEzQMqS9T158H4iz4F5e 7O1Z5QP3YqEcA== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4283EC27C53; Wed, 19 Jun 2024 11:49:00 +0000 (UTC) From: =?utf-8?q?T=C3=B3th_J=C3=A1nos_via_B4_Relay?= Date: Wed, 19 Jun 2024 13:48:52 +0200 Subject: [PATCH v2] drivers: rtc: Add driver for SD2405AL. Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240619-rtc-sd2405al-v2-1-39bea29bd2a5@gmail.com> X-B4-Tracking: v=1; b=H4sIAKPFcmYC/3XMSw6DIBSF4a2YOy4ND+HWjrqPxgEBqjdRMWBMG 8PeS513+J3k/AfkkChkuDcHpLBTprhUyEsDbrTLEBj5apBcttxwZGlzLPsKbSdmedeiQnSoPNT LmsKL3mfu2VePlLeYPmd9F7/1T2gXTDCtdIcioL0Z8xhmS9PVxRn6UsoXHPgswKgAAAA= To: Alexandre Belloni Cc: linux-kernel@vger.kernel.org, linux-rtc@vger.kernel.org, csokas.bence@prolan.hu, =?utf-8?q?T=C3=B3th_J=C3=A1nos?= X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1718797739; l=11932; i=gomba007@gmail.com; s=20230706; h=from:subject:message-id; bh=+XaMZEQFyX4YehZFthAMIa9nxIRXWMDM5QNHScjl5uY=; b=N0iCkk+GkOvH3JNJ8wB3vuA1P9NP1zyIW29aThgCbC7lPzM8+8QUJQg+opCSeDrRjnGJaRmJo /V6K4sf0qciC9Nd9uB/DvdbLns2XKLOcpZRimFa7hQ4+GTQTxVf1z+z X-Developer-Key: i=gomba007@gmail.com; a=ed25519; pk=iY9MjPCbud82ULS2PQJIq3QwjKyP/Sg730I6T2M8Y5U= X-Endpoint-Received: by B4 Relay for gomba007@gmail.com/20230706 with auth_id=60 X-Original-From: =?utf-8?q?T=C3=B3th_J=C3=A1nos?= Reply-To: gomba007@gmail.com From: T=C3=B3th J=C3=A1nos Add support for the DFRobot SD2405AL I2C RTC Module. Datasheet: https://image.dfrobot.com/image/data/TOY0021/SD2405AL%20datasheet%20(Angel= o%20v0.1).pdf Product: https://www.dfrobot.com/product-1600.html To instantiate (assuming device is connected to I2C-1) as root: echo sd2405al 0x32 > /sys/bus/i2c/devices/i2c-1/new_device as user: echo 'sd2405al 0x32' | sudo tee /sys/class/i2c-adapter/i2c-1/new_device The driver is tested with: + hwclock + tools/testing/selftests/rtc/setdate + tools/testing/selftests/rtc/rtctest Signed-off-by: T=C3=B3th J=C3=A1nos --- Changes in v2: - Refactored based on reviewer's suggestions. - I couldn't get the I2C IRQ to work on Raspberry Pi 4, so alarm is skipped. - Link to v1: https://lore.kernel.org/r/20240607-rtc-sd2405al-v1-1-535971e7= a866@gmail.com --- MAINTAINERS | 6 + drivers/rtc/Kconfig | 10 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-sd2405al.c | 305 +++++++++++++++++++++++++++++++++++++++++= ++++ 4 files changed, 322 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 8754ac2c259d..c78587811433 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6337,6 +6337,12 @@ F: include/net/devlink.h F: include/uapi/linux/devlink.h F: net/devlink/ =20 +DFROBOT SD2405AL RTC DRIVER +M: T=C3=B3th J=C3=A1nos +L: linux-rtc@vger.kernel.org +S: Maintained +F: drivers/rtc/rtc-sd2405al.c + DH ELECTRONICS IMX6 DHCOM/DHCOR BOARD SUPPORT M: Christoph Niedermaier L: kernel@dh-electronics.com diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 2a95b05982ad..15f1c0ba5759 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -743,6 +743,16 @@ config RTC_DRV_S5M This driver can also be built as a module. If so, the module will be called rtc-s5m. =20 +config RTC_DRV_SD2405AL + tristate "DFRobot SD2405AL" + select REGMAP_I2C + help + If you say yes here you will get support for the + DFRobot SD2405AL I2C RTC Module. + + This driver can also be built as a module. If so, the module + will be called rtc-sd2405al. + config RTC_DRV_SD3078 tristate "ZXW Shenzhen whwave SD3078" select REGMAP_I2C diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 3004e372f25f..3d19feba1e1c 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -162,6 +162,7 @@ obj-$(CONFIG_RTC_DRV_S3C) +=3D rtc-s3c.o obj-$(CONFIG_RTC_DRV_S5M) +=3D rtc-s5m.o obj-$(CONFIG_RTC_DRV_SA1100) +=3D rtc-sa1100.o obj-$(CONFIG_RTC_DRV_SC27XX) +=3D rtc-sc27xx.o +obj-$(CONFIG_RTC_DRV_SD2405AL) +=3D rtc-sd2405al.o obj-$(CONFIG_RTC_DRV_SD3078) +=3D rtc-sd3078.o obj-$(CONFIG_RTC_DRV_SH) +=3D rtc-sh.o obj-$(CONFIG_RTC_DRV_SNVS) +=3D rtc-snvs.o diff --git a/drivers/rtc/rtc-sd2405al.c b/drivers/rtc/rtc-sd2405al.c new file mode 100644 index 000000000000..ccaa90b7eaf7 --- /dev/null +++ b/drivers/rtc/rtc-sd2405al.c @@ -0,0 +1,305 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * RTC driver for the SD2405AL Real-Time Clock + * + * Datasheet: + * https://image.dfrobot.com/image/data/TOY0021/SD2405AL%20datasheet%20(An= gelo%20v0.1).pdf + * + * Copyright (C) 2024 T=C3=B3th J=C3=A1nos + * Copyright (C) 2018 Zoro Li (rtc-sd3078.c) + * Copyright (C) 2005 James Chapman (rtc-ds1307.c) + */ + +#include +#include +#include +#include +#include + +/* Real time clock registers */ +#define SD2405AL_REG_T_BASE 0x00 +#define SD2405AL_REG_T_SEC 0x00 +#define SD2405AL_REG_T_MIN 0x01 +#define SD2405AL_REG_T_HOUR 0x02 +# define SD2405AL_BIT_12H_PM BIT(5) +# define SD2405AL_BIT_24H BIT(7) +#define SD2405AL_REG_T_WEEK 0x03 +#define SD2405AL_REG_T_DAY 0x04 +#define SD2405AL_REG_T_MON 0x05 +#define SD2405AL_REG_T_YEAR 0x06 + +#define SD2405AL_NUM_T_REGS (SD2405AL_REG_T_YEAR - SD2405AL_REG_T_SEC + 1) + +/* Control registers */ +#define SD2405AL_REG_CTR_BASE 0x0F +#define SD2405AL_REG_CTR1 0x00 +# define SD2405AL_BIT_WRTC2 BIT(2) +# define SD2405AL_BIT_WRTC3 BIT(6) +#define SD2405AL_REG_CTR2 0x01 +# define SD2405AL_BIT_WRTC1 BIT(7) +#define SD2405AL_REG_CTR3 0x02 +#define SD2405AL_REG_TTF 0x03 +#define SD2405AL_REG_CNTDWN 0x04 + +/* General RAM */ +#define SD2405AL_REG_M_START 0x14 +#define SD2405AL_REG_M_END 0x1F + +struct sd2405al { + struct device *dev; + struct rtc_device *rtc; + struct regmap *regmap; +}; + +static int sd2405al_setup(struct sd2405al *sd2405al) +{ + unsigned int reg; + unsigned int val; + int ret; + + /* enable write, order is important */ + reg =3D SD2405AL_REG_CTR_BASE + SD2405AL_REG_CTR2; + val =3D SD2405AL_BIT_WRTC1; + /* + * CTR2.IM =3D 0, single event alarm + * CTR2.S{1,0} =3D 0, disable INT pin + * CTR2.FOBAT =3D 0, interrupt enabled during battery backup mode + * CTR2.INTDE =3D 0, countdown interrupt disabled + * CTR2.INTAE =3D 0, alarm interrupt disabled + * CTR2.INTFE =3D 0, frequency interrupt disabled + */ + ret =3D regmap_write(sd2405al->regmap, reg, val); + if (ret < 0) { + dev_err(sd2405al->dev, "write failed: %d\n", ret); + return ret; + } + + reg =3D SD2405AL_REG_CTR_BASE + SD2405AL_REG_CTR1; + val =3D SD2405AL_BIT_WRTC2 | SD2405AL_BIT_WRTC3; + /* + * CTR1.INTAF =3D 0, clear alarm interrupt flag + * CTR2.INTDF =3D 0, clear countdown interrupt flag + */ + ret =3D regmap_write(sd2405al->regmap, reg, val); + if (ret < 0) { + dev_err(sd2405al->dev, "write failed: %d\n", ret); + return ret; + } + + reg =3D SD2405AL_REG_CTR_BASE + SD2405AL_REG_CTR3; + val =3D 0; + /* + * CRT3.ARTS =3D 0, disable auto reset of interrupt flags + * CTR3.TDS{1,0} =3D 0, unused, since countdown interrupt is disabled + * CTR3.FS{3,0} =3D 0, unused since frequency interrupt is disabled + */ + ret =3D regmap_write(sd2405al->regmap, reg, val); + if (ret < 0) { + dev_err(sd2405al->dev, "write failed: %d\n", ret); + return ret; + } + + dev_dbg(sd2405al->dev, "setup done\n"); + + return 0; +} + +static int sd2405al_check_writable(struct sd2405al *sd2405al) +{ + u8 data[2] =3D { 0 }; + int w32, w1; + int ret; + + ret =3D regmap_bulk_read(sd2405al->regmap, + SD2405AL_REG_CTR_BASE, data, 2); + if (ret < 0) { + dev_err(sd2405al->dev, "read failed: %d\n", ret); + return ret; + } + + w32 =3D data[SD2405AL_REG_CTR1]; + w32 &=3D (SD2405AL_BIT_WRTC2 | SD2405AL_BIT_WRTC3); + + w1 =3D data[SD2405AL_REG_CTR2]; + w1 &=3D SD2405AL_BIT_WRTC1; + + return (w32 !=3D 0) && (w1 !=3D 0); +} + +static int sd2405al_read_time(struct device *dev, struct rtc_time *time) +{ + u8 hour; + u8 data[SD2405AL_NUM_T_REGS] =3D { 0 }; + struct sd2405al *sd2405al =3D dev_get_drvdata(dev); + int ret; + + /* check if the device is powered on/working */ + ret =3D sd2405al_check_writable(sd2405al); + if (ret =3D=3D 0) { + dev_err(sd2405al->dev, "invalid device status\n"); + return -EINVAL; + } else if (ret < 0) { + return ret; + } else { + dev_dbg(sd2405al->dev, "device status is valid\n"); + } + + ret =3D regmap_bulk_read(sd2405al->regmap, SD2405AL_REG_T_BASE, data, + SD2405AL_NUM_T_REGS); + if (ret < 0) { + dev_err(sd2405al->dev, "read failed: %d\n", ret); + return ret; + } + + time->tm_sec =3D bcd2bin(data[SD2405AL_REG_T_SEC] & 0x7F); + time->tm_min =3D bcd2bin(data[SD2405AL_REG_T_MIN] & 0x7F); + + hour =3D data[SD2405AL_REG_T_HOUR]; + if (hour & SD2405AL_BIT_24H) + time->tm_hour =3D bcd2bin(hour & 0x3F); + else + if (hour & SD2405AL_BIT_12H_PM) + time->tm_hour =3D bcd2bin(hour & 0x1F) + 12; + else /* 12 hour mode, AM */ + time->tm_hour =3D bcd2bin(hour & 0x1F); + + time->tm_mday =3D bcd2bin(data[SD2405AL_REG_T_DAY] & 0x3F); + time->tm_wday =3D data[SD2405AL_REG_T_WEEK] & 0x07; + time->tm_mon =3D bcd2bin(data[SD2405AL_REG_T_MON] & 0x1F) - 1; + time->tm_year =3D bcd2bin(data[SD2405AL_REG_T_YEAR]) + 100; + + dev_dbg(sd2405al->dev, "read time: %d-%02d-%02d %02d:%02d:%02d\n", + time->tm_year, time->tm_mon, time->tm_mday, + time->tm_hour, time->tm_min, time->tm_sec); + + return 0; +} + +static int sd2405al_set_time(struct device *dev, struct rtc_time *time) +{ + u8 data[SD2405AL_NUM_T_REGS]; + struct sd2405al *sd2405al =3D dev_get_drvdata(dev); + int ret; + + ret =3D sd2405al_check_writable(sd2405al); + if (ret =3D=3D 0) { + dev_err(sd2405al->dev, "device is not writable\n"); + return -EINVAL; + } else if (ret < 0) { + return ret; + } else { + dev_dbg(sd2405al->dev, "device is writable\n"); + } + + data[SD2405AL_REG_T_SEC] =3D bin2bcd(time->tm_sec); + data[SD2405AL_REG_T_MIN] =3D bin2bcd(time->tm_min); + data[SD2405AL_REG_T_HOUR] =3D bin2bcd(time->tm_hour) | SD2405AL_BIT_24H; + data[SD2405AL_REG_T_DAY] =3D bin2bcd(time->tm_mday); + data[SD2405AL_REG_T_WEEK] =3D time->tm_wday & 0x07; + data[SD2405AL_REG_T_MON] =3D bin2bcd(time->tm_mon) + 1; + data[SD2405AL_REG_T_YEAR] =3D bin2bcd(time->tm_year - 100); + + ret =3D regmap_bulk_write(sd2405al->regmap, SD2405AL_REG_T_BASE, data, + SD2405AL_NUM_T_REGS); + if (ret < 0) { + dev_err(sd2405al->dev, "write failed: %d\n", ret); + return ret; + } + + dev_dbg(sd2405al->dev, "set time: %d-%02d-%02d %02d:%02d:%02d\n", + time->tm_year, time->tm_mon, time->tm_mday, + time->tm_hour, time->tm_min, time->tm_sec); + + return 0; +} + +static const struct rtc_class_ops sd2405al_rtc_ops =3D { + .read_time =3D sd2405al_read_time, + .set_time =3D sd2405al_set_time, +}; + +static const struct regmap_config sd2405al_regmap_conf =3D { + .reg_bits =3D 8, + .val_bits =3D 8, + .max_register =3D SD2405AL_REG_M_END, +}; + +static int sd2405al_probe(struct i2c_client *client) +{ + struct sd2405al *sd2405al; + int func; + int ret; + + func =3D i2c_check_functionality(client->adapter, I2C_FUNC_I2C); + if (!func) { + dev_err(&client->dev, "invalid adapter\n"); + return -ENODEV; + } + + sd2405al =3D devm_kzalloc(&client->dev, sizeof(*sd2405al), GFP_KERNEL); + if (!sd2405al) { + dev_err(&client->dev, "unable to allocate memory\n"); + return -ENOMEM; + } + + sd2405al->dev =3D &client->dev; + + sd2405al->regmap =3D devm_regmap_init_i2c(client, &sd2405al_regmap_conf); + if (IS_ERR(sd2405al->regmap)) { + dev_err(sd2405al->dev, "unable to allocate regmap\n"); + return PTR_ERR(sd2405al->regmap); + } + + ret =3D sd2405al_setup(sd2405al); + if (ret < 0) { + dev_err(sd2405al->dev, "unable to setup device\n"); + return ret; + } + + sd2405al->rtc =3D devm_rtc_allocate_device(&client->dev); + if (IS_ERR(sd2405al->rtc)) { + dev_err(sd2405al->dev, "unable to allocate device\n"); + return PTR_ERR(sd2405al->rtc); + } + + sd2405al->rtc->ops =3D &sd2405al_rtc_ops; + sd2405al->rtc->range_min =3D RTC_TIMESTAMP_BEGIN_2000; + sd2405al->rtc->range_max =3D RTC_TIMESTAMP_END_2099; + + dev_set_drvdata(&client->dev, sd2405al); + + ret =3D devm_rtc_register_device(sd2405al->rtc); + if (ret < 0) { + dev_err(sd2405al->dev, "unable to register device: %d\n", ret); + return ret; + } + + return 0; +} + +static const struct i2c_device_id sd2405al_id[] =3D { + { "sd2405al", 0 }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(i2c, sd2405al_id); + +static const __maybe_unused struct of_device_id sd2405al_of_match[] =3D { + { .compatible =3D "dfrobot,sd2405al" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, sd2405al_of_match); + +static struct i2c_driver sd2405al_driver =3D { + .driver =3D { + .name =3D "sd2405al", + .of_match_table =3D of_match_ptr(sd2405al_of_match), + }, + .probe =3D sd2405al_probe, + .id_table =3D sd2405al_id, +}; + +module_i2c_driver(sd2405al_driver); + +MODULE_AUTHOR("T=C3=B3th J=C3=A1nos"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("SD2405AL RTC driver"); --- base-commit: c3f38fa61af77b49866b006939479069cd451173 change-id: 20240607-rtc-sd2405al-a0947377c73d Best regards, --=20 T=C3=B3th J=C3=A1nos