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[60.250.196.139]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-724beeb83d4sm2812530b3a.40.2024.11.20.22.41.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 Nov 2024 22:41:28 -0800 (PST) From: Ming Yu X-Google-Original-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 Subject: [PATCH v2 7/7] rtc: Add Nuvoton NCT6694 RTC support Date: Thu, 21 Nov 2024 14:40:46 +0800 Message-Id: <20241121064046.3724726-8-tmyu0@nuvoton.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241121064046.3724726-1-tmyu0@nuvoton.com> References: <20241121064046.3724726-1-tmyu0@nuvoton.com> Precedence: bulk X-Mailing-List: linux-gpio@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 | 263 ++++++++++++++++++++++++++++++++++++++ 4 files changed, 275 insertions(+) create mode 100644 drivers/rtc/rtc-nct6694.c diff --git a/MAINTAINERS b/MAINTAINERS index d6414eea0463..6d1cfec28076 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -16550,6 +16550,7 @@ F: drivers/hwmon/nct6694-hwmon.c F: drivers/i2c/busses/i2c-nct6694.c F: drivers/mfd/nct6694.c F: drivers/net/can/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 66eb1122248b..36829d096194 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -406,6 +406,16 @@ 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 f62340ecc534..64443d26bb5b 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -116,6 +116,7 @@ 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..097555a16b4f --- /dev/null +++ b/drivers/rtc/rtc-nct6694.c @@ -0,0 +1,263 @@ +// 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 + +/* Host interface */ +#define NCT6694_RTC_MOD 0x08 + +/* Message Channel */ +/* Command 00h */ +#define NCT6694_RTC_CMD0_LEN 0x07 +#define NCT6694_RTC_CMD0_OFFSET 0x0000 /* OFFSET = SEL|CMD */ +/* Command 01h */ +#define NCT6694_RTC_CMD1_LEN 0x05 +#define NCT6694_RTC_CMD1_OFFSET 0x0001 /* OFFSET = SEL|CMD */ +/* Command 02h */ +#define NCT6694_RTC_CMD2_LEN 0x02 +#define NCT6694_RTC_CMD2_OFFSET 0x0002 /* OFFSET = SEL|CMD */ + +#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_cmd0 { + u8 sec; + u8 min; + u8 hour; + u8 week; + u8 day; + u8 month; + u8 year; +}; + +struct __packed nct6694_rtc_cmd1 { + u8 sec; + u8 min; + u8 hour; + u8 alarm_en; + u8 alarm_pend; +}; + +struct __packed nct6694_rtc_cmd2 { + u8 irq_en; + u8 irq_pend; +}; + +struct nct6694_rtc_data { + struct nct6694 *nct6694; + struct rtc_device *rtc; + struct mutex lock; + unsigned char *xmit_buf; +}; + +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_cmd0 *buf = (struct nct6694_rtc_cmd0 *)data->xmit_buf; + int ret; + + guard(mutex)(&data->lock); + + ret = nct6694_read_msg(data->nct6694, NCT6694_RTC_MOD, + NCT6694_RTC_CMD0_OFFSET, + NCT6694_RTC_CMD0_LEN, + buf); + if (ret) + return ret; + + tm->tm_sec = bcd2bin(buf->sec); /* tm_sec expect 0 ~ 59 */ + tm->tm_min = bcd2bin(buf->min); /* tm_min expect 0 ~ 59 */ + tm->tm_hour = bcd2bin(buf->hour); /* tm_hour expect 0 ~ 23 */ + tm->tm_wday = bcd2bin(buf->week) - 1; /* tm_wday expect 0 ~ 6 */ + tm->tm_mday = bcd2bin(buf->day); /* tm_mday expect 1 ~ 31 */ + tm->tm_mon = bcd2bin(buf->month) - 1; /* tm_month expect 0 ~ 11 */ + tm->tm_year = bcd2bin(buf->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_cmd0 *buf = (struct nct6694_rtc_cmd0 *)data->xmit_buf; + + guard(mutex)(&data->lock); + + buf->sec = bin2bcd(tm->tm_sec); + buf->min = bin2bcd(tm->tm_min); + buf->hour = bin2bcd(tm->tm_hour); + buf->week = bin2bcd(tm->tm_wday + 1); + buf->day = bin2bcd(tm->tm_mday); + buf->month = bin2bcd(tm->tm_mon + 1); + buf->year = bin2bcd(tm->tm_year - 100); + + return nct6694_write_msg(data->nct6694, NCT6694_RTC_MOD, + NCT6694_RTC_CMD0_OFFSET, + NCT6694_RTC_CMD0_LEN, + buf); +} + +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_cmd1 *buf = (struct nct6694_rtc_cmd1 *)data->xmit_buf; + int ret; + + guard(mutex)(&data->lock); + + ret = nct6694_read_msg(data->nct6694, NCT6694_RTC_MOD, + NCT6694_RTC_CMD1_OFFSET, + NCT6694_RTC_CMD1_LEN, + buf); + if (ret) + return ret; + + alrm->time.tm_sec = bcd2bin(buf->sec); + alrm->time.tm_min = bcd2bin(buf->min); + alrm->time.tm_hour = bcd2bin(buf->hour); + alrm->enabled = buf->alarm_en; + alrm->pending = buf->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_cmd1 *buf = (struct nct6694_rtc_cmd1 *)data->xmit_buf; + + guard(mutex)(&data->lock); + + buf->sec = bin2bcd(alrm->time.tm_sec); + buf->min = bin2bcd(alrm->time.tm_min); + buf->hour = bin2bcd(alrm->time.tm_hour); + buf->alarm_en = alrm->enabled ? NCT6694_RTC_IRQ_EN : 0; + buf->alarm_pend = 0; + + return nct6694_write_msg(data->nct6694, NCT6694_RTC_MOD, + NCT6694_RTC_CMD1_OFFSET, + NCT6694_RTC_CMD1_LEN, + buf); +} + +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_cmd2 *buf = (struct nct6694_rtc_cmd2 *)data->xmit_buf; + + guard(mutex)(&data->lock); + + if (enabled) + buf->irq_en |= NCT6694_RTC_IRQ_EN; + else + buf->irq_en &= ~NCT6694_RTC_IRQ_EN; + + buf->irq_pend = 0; + + return nct6694_write_msg(data->nct6694, NCT6694_RTC_MOD, + NCT6694_RTC_CMD2_OFFSET, + NCT6694_RTC_CMD2_LEN, + buf); +} + +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_cmd2 *buf = (struct nct6694_rtc_cmd2 *)data->xmit_buf; + int ret; + + guard(mutex)(&data->lock); + + buf->irq_en = NCT6694_RTC_IRQ_EN; + buf->irq_pend = NCT6694_RTC_IRQ_STS; + ret = nct6694_write_msg(data->nct6694, NCT6694_RTC_MOD, + NCT6694_RTC_CMD2_OFFSET, + NCT6694_RTC_CMD2_LEN, + buf); + if (ret) + return IRQ_NONE; + + rtc_update_irq(data->rtc, 1, RTC_IRQF | RTC_AF); + + 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->xmit_buf = devm_kcalloc(&pdev->dev, NCT6694_MAX_PACKET_SZ, + sizeof(unsigned char), GFP_KERNEL); + if (!data->xmit_buf) + 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; + + mutex_init(&data->lock); + + device_set_wakeup_capable(&pdev->dev, 1); + + 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"); + + /* Register rtc device to RTC framework */ + return devm_rtc_register_device(data->rtc); +} + +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");