From patchwork Tue Jan 14 03:30:10 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Yu X-Patchwork-Id: 13938360 Received: from mail-pl1-f175.google.com (mail-pl1-f175.google.com [209.85.214.175]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 254602451D6; Tue, 14 Jan 2025 03:30:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.175 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736825459; cv=none; b=Kj6VbUi1XMEDdQhyyvWWX0Aq9dJc0Gw4Nn5ILzSA1ABjXx6sQG2axb4fnqmm3HVMhVK3uHerFP3J3aeIznUR5/z2HRMnnvPGz/ItxiUvHVrg5lQIQNAEVSZOpxvBf+3sFhGfcli7MoBx2aiGvFfxUvng/BrBV4P57j45FBohc1w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736825459; c=relaxed/simple; bh=CvxrNe8e/4BaiSfOBSwCj1KQ5/77UOBBQdLZgL/RNoA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=P0wiJxx67Eitakd1AD/eLm2tGTVbuoKCfivuMuiIq0H+0NZtUMuKCXuf7+4ngNEX+jMyCfq4oMOLwWyF4oR72MXi+Jzvdjgk3rKm0jhJp9JTE+FfzreYuaBLInmaWIoFStJKmesI8n0J0fj6wjKMe5VCfHACyRgVN7uH96TRdNo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=Hn0peWGJ; arc=none smtp.client-ip=209.85.214.175 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Hn0peWGJ" Received: by mail-pl1-f175.google.com with SMTP id d9443c01a7336-2166022c5caso77535065ad.2; Mon, 13 Jan 2025 19:30:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1736825456; x=1737430256; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=5FcdLdnPNCznIFI/wzOEmfhmBl5xfGYEDQL7X7E12xg=; b=Hn0peWGJZ8r5BCMB423TitBf+1q+dJCPYDBb4pYYbjaTDF98agBhZrf1UbVF9bte+S hlODKeDFENfQoFzRU5z7UgBoiqaCIvtY6uGNsr9hCJxfc9bYuSnCC5VtaiJm0B+VCtf4 6i6lm/7Z8tr44Ak3cGG+hBVH8cz0hoQ6FFPQXWM/fJE36g22x7pfO12AZ+1nHb+Z1buP d/fFaTn4YIxEQ0O44UEOzPhoKzjxudecq+m1eF0NaxrljaODEz5e/fXJpoq6zgeWgo63 ER705fzXJYwv0noHrph6daX8QuAlcoRsxgqAhLxLE3OxxJzfVrcu7GRHNvcsZ7ATpjQ2 xMZA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1736825456; x=1737430256; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=5FcdLdnPNCznIFI/wzOEmfhmBl5xfGYEDQL7X7E12xg=; b=SOFyYJthNsOBF4WNGG7O7Z9nHgsaD1rxR2DrUeDrBVAFpnb0HtQWV7zZ3aLr2NUggn omxWP4mIXuS08fGWY+gmXD40MJ1cOh/HSsKiYaa9W7ewXb4uS0OSP00sWu2N1SVwSIYJ 7kiL9Zg48Osoa+r4/y2AFYqqjMN+ezdefigHdOoBRXGOycl3qmMTLM4SbRfQo6ydiw68 ngapyi84FNtBHdm7wLhjkruY9jCtpNQ63JcTJ7NwMkmeps9JHVHR63u2wdSSAACUfhsV vXznvTGpggpPxpDpfhK54ycJmJxWNO6KX2dI6JKlALuepMPSFmm6iZQBxyQdzBT5WvCx e/AQ== X-Forwarded-Encrypted: i=1; AJvYcCUGOqfQPlu50YsgZlpOtA2qxeyPCpaSkU4/+r2oXq40HtVQocM4/NWN3RD1L2D3ZY98rJPMlkRY@vger.kernel.org, AJvYcCURTaA/awANtLjuJXT021WCuwjCWxLxC6F5MwoUIb+WbnSqBYD3Jz3uuJiVQrC+BNmkjw/sOc0tDFog@vger.kernel.org, AJvYcCUmngvZLfdWopiqH2kmnO/5eFuqXlH2gLPFtqXwsqS291SoQ4lHCnNaXy/1Q+tOYIc8EYbe6FgfRfNw@vger.kernel.org, AJvYcCV14kSePTj4DcJsiVMsv13JvjUO36WA3Z/7XDlDgplFrsLigexdPDWPx93hdOff3VJlf//oJzm8EKc=@vger.kernel.org, AJvYcCV9ELSxsQTi1P/kYeEt4m3v+FcIyPuW+PpjgqURzRWXvE4PHkCDhjwX/BM/XIbsO84EQddza3G5qeIN3zA=@vger.kernel.org, AJvYcCVTucoMY8gv+aLiMu9R7e70Tu1pzquW3OqDY2gXpplnpgWA1HHmmsDebE98m1K5T5JbQFcmMsBmYzFW4YUY23o=@vger.kernel.org, AJvYcCVZMhoDQDD0LJz15dguHzw/bn4p/njzhVDCniqmnJQXNSQ2iWgcm7t6+nZU89rGyAELJEJzd6aCs1SzzQ==@vger.kernel.org, AJvYcCXTT098e6U9Rw681JDuY04i3Y9oz+qEcYUhMbcA8Ja9iiS/CGIv0N5iEBhCi90X+XrtI6LbYwAVdZqq@vger.kernel.org X-Gm-Message-State: AOJu0YzdWIge+6AFuI8YWEmSqw8AiASyw5Rc7HGAfN3jhzM5nT+LBhzh fZaqjh2ihEIUIQCPMqvX7uvlu3BO6u6xsXl7//h36Du5WETUVcTr X-Gm-Gg: ASbGncvC4J3iOG5WeaqApmkF2pckfxdSZcEJAwAQYwZg588Uz0xHnGUHk+91E6nYY3x +gmDs24Ym7Ofbe2L+zyGQdyErT6e9vJRCotcK1ol0QAjlnhj7knU2LqcdVHCu/3ckQmJp2gaUsj wAWJZt9SJAfmfrckohEXR242VpT6RsxDZB99Jaa6Ny5Fo4DnwfOPv134+WTbKfb70TgVFsfIWHR 01ULKGHCn6MZsNpDshBvDGFzv4RvOCua9kUgDAhaa/2nFh/i/lPIgN4nGNCBBn+fZt451v+QLBp MyStQpHlSVZlJI7HSAvK8/EH X-Google-Smtp-Source: AGHT+IEun7RHtFjwYDJ96um2RN8ttGvuzqEME7zM4yWlHvNfi9JcwZNJ6bIjR85GG5h2n50BDbqi+g== X-Received: by 2002:a05:6a00:2908:b0:728:e745:23d8 with SMTP id d2e1a72fcca58-72d21ffab83mr36378554b3a.24.1736825456176; Mon, 13 Jan 2025 19:30:56 -0800 (PST) Received: from hcdev-d520mt2.. (60-250-196-139.hinet-ip.hinet.net. [60.250.196.139]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-72d40658b71sm6595400b3a.85.2025.01.13.19.30.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Jan 2025 19:30:55 -0800 (PST) From: Ming Yu To: tmyu0@nuvoton.com, lee@kernel.org, linus.walleij@linaro.org, brgl@bgdev.pl, andi.shyti@kernel.org, mkl@pengutronix.de, mailhol.vincent@wanadoo.fr, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, wim@linux-watchdog.org, linux@roeck-us.net, jdelvare@suse.com, alexandre.belloni@bootlin.com Cc: linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org, linux-can@vger.kernel.org, netdev@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-rtc@vger.kernel.org, linux-usb@vger.kernel.org, Ming Yu Subject: [PATCH v5 7/7] rtc: Add Nuvoton NCT6694 RTC support Date: Tue, 14 Jan 2025 11:30:10 +0800 Message-Id: <20250114033010.2445925-8-a0282524688@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250114033010.2445925-1-a0282524688@gmail.com> References: <20250114033010.2445925-1-a0282524688@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 This driver supports RTC functionality for NCT6694 MFD device based on USB interface. Signed-off-by: Ming Yu --- MAINTAINERS | 1 + drivers/rtc/Kconfig | 10 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-nct6694.c | 286 ++++++++++++++++++++++++++++++++++++++ 4 files changed, 298 insertions(+) create mode 100644 drivers/rtc/rtc-nct6694.c diff --git a/MAINTAINERS b/MAINTAINERS index a14a2d65b8a6..5275ff7a793c 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -16726,6 +16726,7 @@ F: drivers/hwmon/nct6694-hwmon.c F: drivers/i2c/busses/i2c-nct6694.c F: drivers/mfd/nct6694.c F: drivers/net/can/usb/nct6694_canfd.c +F: drivers/rtc/rtc-nct6694.c F: drivers/watchdog/nct6694_wdt.c F: include/linux/mfd/nct6694.h diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index a60bcc791a48..aeab67acbc84 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -416,6 +416,16 @@ config RTC_DRV_NCT3018Y This driver can also be built as a module, if so, the module will be called "rtc-nct3018y". +config RTC_DRV_NCT6694 + tristate "Nuvoton NCT6694 RTC support" + depends on MFD_NCT6694 + help + If you say yes to this option, support will be included for Nuvoton + NCT6694, a USB device to RTC. + + This driver can also be built as a module. If so, the module will + be called rtc-nct6694. + config RTC_DRV_RK808 tristate "Rockchip RK805/RK808/RK809/RK817/RK818 RTC" depends on MFD_RK8XX diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 489b4ab07068..d0d6f4a4972e 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -118,6 +118,7 @@ obj-$(CONFIG_RTC_DRV_MXC) += rtc-mxc.o obj-$(CONFIG_RTC_DRV_MXC_V2) += rtc-mxc_v2.o obj-$(CONFIG_RTC_DRV_GAMECUBE) += rtc-gamecube.o obj-$(CONFIG_RTC_DRV_NCT3018Y) += rtc-nct3018y.o +obj-$(CONFIG_RTC_DRV_NCT6694) += rtc-nct6694.o obj-$(CONFIG_RTC_DRV_NTXEC) += rtc-ntxec.o obj-$(CONFIG_RTC_DRV_OMAP) += rtc-omap.o obj-$(CONFIG_RTC_DRV_OPAL) += rtc-opal.o diff --git a/drivers/rtc/rtc-nct6694.c b/drivers/rtc/rtc-nct6694.c new file mode 100644 index 000000000000..dbb5ccae2796 --- /dev/null +++ b/drivers/rtc/rtc-nct6694.c @@ -0,0 +1,286 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Nuvoton NCT6694 RTC driver based on USB interface. + * + * Copyright (C) 2024 Nuvoton Technology Corp. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * USB command module type for NCT6694 RTC controller. + * This defines the module type used for communication with the NCT6694 + * RTC controller over the USB interface. + */ +#define NCT6694_RTC_MOD 0x08 + +/* Command 00h - RTC Time */ +#define NCT6694_RTC_TIME 0x0000 +#define NCT6694_RTC_TIME_SEL 0x00 + +/* Command 01h - RTC Alarm */ +#define NCT6694_RTC_ALARM 0x01 +#define NCT6694_RTC_ALARM_SEL 0x00 + +/* Command 02h - RTC Status */ +#define NCT6694_RTC_STATUS 0x02 +#define NCT6694_RTC_STATUS_SEL 0x00 + +#define NCT6694_RTC_IRQ_INT_EN BIT(0) /* Transmit a USB INT-in when RTC alarm */ +#define NCT6694_RTC_IRQ_GPO_EN BIT(5) /* Trigger a GPO Low Pulse when RTC alarm */ + +#define NCT6694_RTC_IRQ_EN (NCT6694_RTC_IRQ_INT_EN | NCT6694_RTC_IRQ_GPO_EN) +#define NCT6694_RTC_IRQ_STS BIT(0) /* Write 1 clear IRQ status */ + +struct __packed nct6694_rtc_time { + u8 sec; + u8 min; + u8 hour; + u8 week; + u8 day; + u8 month; + u8 year; +}; + +struct __packed nct6694_rtc_alarm { + u8 sec; + u8 min; + u8 hour; + u8 alarm_en; + u8 alarm_pend; +}; + +struct __packed nct6694_rtc_status { + u8 irq_en; + u8 irq_pend; +}; + +union __packed nct6694_rtc_msg { + struct nct6694_rtc_time time; + struct nct6694_rtc_alarm alarm; + struct nct6694_rtc_status sts; +}; + +struct nct6694_rtc_data { + struct nct6694 *nct6694; + struct rtc_device *rtc; + union nct6694_rtc_msg *msg; +}; + +static int nct6694_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct nct6694_rtc_data *data = dev_get_drvdata(dev); + struct nct6694_rtc_time *time = &data->msg->time; + struct nct6694_cmd_header cmd_hd = { + .mod = NCT6694_RTC_MOD, + .cmd = NCT6694_RTC_TIME, + .sel = NCT6694_RTC_TIME_SEL, + .len = cpu_to_le16(sizeof(*time)) + }; + int ret; + + ret = nct6694_read_msg(data->nct6694, &cmd_hd, time); + if (ret) + return ret; + + tm->tm_sec = bcd2bin(time->sec); /* tm_sec expect 0 ~ 59 */ + tm->tm_min = bcd2bin(time->min); /* tm_min expect 0 ~ 59 */ + tm->tm_hour = bcd2bin(time->hour); /* tm_hour expect 0 ~ 23 */ + tm->tm_wday = bcd2bin(time->week) - 1; /* tm_wday expect 0 ~ 6 */ + tm->tm_mday = bcd2bin(time->day); /* tm_mday expect 1 ~ 31 */ + tm->tm_mon = bcd2bin(time->month) - 1; /* tm_month expect 0 ~ 11 */ + tm->tm_year = bcd2bin(time->year) + 100; /* tm_year expect since 1900 */ + + return ret; +} + +static int nct6694_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct nct6694_rtc_data *data = dev_get_drvdata(dev); + struct nct6694_rtc_time *time = &data->msg->time; + struct nct6694_cmd_header cmd_hd = { + .mod = NCT6694_RTC_MOD, + .cmd = NCT6694_RTC_TIME, + .sel = NCT6694_RTC_TIME_SEL, + .len = cpu_to_le16(sizeof(*time)) + }; + + time->sec = bin2bcd(tm->tm_sec); + time->min = bin2bcd(tm->tm_min); + time->hour = bin2bcd(tm->tm_hour); + time->week = bin2bcd(tm->tm_wday + 1); + time->day = bin2bcd(tm->tm_mday); + time->month = bin2bcd(tm->tm_mon + 1); + time->year = bin2bcd(tm->tm_year - 100); + + return nct6694_write_msg(data->nct6694, &cmd_hd, time); +} + +static int nct6694_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct nct6694_rtc_data *data = dev_get_drvdata(dev); + struct nct6694_rtc_alarm *alarm = &data->msg->alarm; + struct nct6694_cmd_header cmd_hd = { + .mod = NCT6694_RTC_MOD, + .cmd = NCT6694_RTC_ALARM, + .sel = NCT6694_RTC_ALARM_SEL, + .len = cpu_to_le16(sizeof(*alarm)) + }; + int ret; + + ret = nct6694_read_msg(data->nct6694, &cmd_hd, alarm); + if (ret) + return ret; + + alrm->time.tm_sec = bcd2bin(alarm->sec); + alrm->time.tm_min = bcd2bin(alarm->min); + alrm->time.tm_hour = bcd2bin(alarm->hour); + alrm->enabled = alarm->alarm_en; + alrm->pending = alarm->alarm_pend; + + return ret; +} + +static int nct6694_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct nct6694_rtc_data *data = dev_get_drvdata(dev); + struct nct6694_rtc_alarm *alarm = &data->msg->alarm; + struct nct6694_cmd_header cmd_hd = { + .mod = NCT6694_RTC_MOD, + .cmd = NCT6694_RTC_ALARM, + .sel = NCT6694_RTC_ALARM_SEL, + .len = cpu_to_le16(sizeof(*alarm)) + }; + + alarm->sec = bin2bcd(alrm->time.tm_sec); + alarm->min = bin2bcd(alrm->time.tm_min); + alarm->hour = bin2bcd(alrm->time.tm_hour); + alarm->alarm_en = alrm->enabled ? NCT6694_RTC_IRQ_EN : 0; + alarm->alarm_pend = 0; + + return nct6694_write_msg(data->nct6694, &cmd_hd, alarm); +} + +static int nct6694_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) +{ + struct nct6694_rtc_data *data = dev_get_drvdata(dev); + struct nct6694_rtc_status *sts = &data->msg->sts; + struct nct6694_cmd_header cmd_hd = { + .mod = NCT6694_RTC_MOD, + .cmd = NCT6694_RTC_STATUS, + .sel = NCT6694_RTC_STATUS_SEL, + .len = cpu_to_le16(sizeof(*sts)) + }; + + if (enabled) + sts->irq_en |= NCT6694_RTC_IRQ_EN; + else + sts->irq_en &= ~NCT6694_RTC_IRQ_EN; + + sts->irq_pend = 0; + + return nct6694_write_msg(data->nct6694, &cmd_hd, sts); +} + +static const struct rtc_class_ops nct6694_rtc_ops = { + .read_time = nct6694_rtc_read_time, + .set_time = nct6694_rtc_set_time, + .read_alarm = nct6694_rtc_read_alarm, + .set_alarm = nct6694_rtc_set_alarm, + .alarm_irq_enable = nct6694_rtc_alarm_irq_enable, +}; + +static irqreturn_t nct6694_irq(int irq, void *dev_id) +{ + struct nct6694_rtc_data *data = dev_id; + struct nct6694_rtc_status *sts = &data->msg->sts; + struct nct6694_cmd_header cmd_hd = { + .mod = NCT6694_RTC_MOD, + .cmd = NCT6694_RTC_STATUS, + .sel = NCT6694_RTC_STATUS_SEL, + .len = cpu_to_le16(sizeof(*sts)) + }; + int ret; + + rtc_lock(data->rtc); + + sts->irq_en = NCT6694_RTC_IRQ_EN; + sts->irq_pend = NCT6694_RTC_IRQ_STS; + ret = nct6694_write_msg(data->nct6694, &cmd_hd, sts); + if (ret) { + rtc_unlock(data->rtc); + return IRQ_NONE; + } + + rtc_update_irq(data->rtc, 1, RTC_IRQF | RTC_AF); + + rtc_unlock(data->rtc); + + return IRQ_HANDLED; +} + +static int nct6694_rtc_probe(struct platform_device *pdev) +{ + struct nct6694_rtc_data *data; + struct nct6694 *nct6694 = dev_get_drvdata(pdev->dev.parent); + int ret, irq; + + irq = irq_create_mapping(nct6694->domain, NCT6694_IRQ_RTC); + if (!irq) + return -EINVAL; + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->msg = devm_kzalloc(&pdev->dev, sizeof(union nct6694_rtc_msg), + GFP_KERNEL); + if (!data->msg) + return -ENOMEM; + + data->rtc = devm_rtc_allocate_device(&pdev->dev); + if (IS_ERR(data->rtc)) + return PTR_ERR(data->rtc); + + data->nct6694 = nct6694; + data->rtc->ops = &nct6694_rtc_ops; + data->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; + data->rtc->range_max = RTC_TIMESTAMP_END_2099; + + platform_set_drvdata(pdev, data); + + ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, + nct6694_irq, IRQF_ONESHOT, + "nct6694-rtc", data); + if (ret < 0) + return dev_err_probe(&pdev->dev, ret, "Failed to request irq\n"); + + ret = devm_rtc_register_device(data->rtc); + if (ret) + return dev_err_probe(&pdev->dev, ret, "Failed to register rtc\n"); + + device_init_wakeup(&pdev->dev, true); + return 0; +} + +static struct platform_driver nct6694_rtc_driver = { + .driver = { + .name = "nct6694-rtc", + }, + .probe = nct6694_rtc_probe, +}; + +module_platform_driver(nct6694_rtc_driver); + +MODULE_DESCRIPTION("USB-RTC driver for NCT6694"); +MODULE_AUTHOR("Ming Yu "); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:nct6694-rtc");