| Message ID | 20250207074502.1055111-8-a0282524688@gmail.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v7,1/7] mfd: Add core driver for Nuvoton NCT6694 | expand |
On 07/02/2025 15:45:02+0800, Ming Yu wrote: > This driver supports RTC functionality for NCT6694 MFD device > based on USB interface. > > Signed-off-by: Ming Yu <a0282524688@gmail.com> Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com> > --- > 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 a9eda4530b07..7eba4ffdc877 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -16927,6 +16927,7 @@ 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 0bbbf778ecfa..248425bf26f3 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..892674d453d1 > --- /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 <linux/bcd.h> > +#include <linux/irqdomain.h> > +#include <linux/kernel.h> > +#include <linux/mfd/core.h> > +#include <linux/mfd/nct6694.h> > +#include <linux/module.h> > +#include <linux/platform_device.h> > +#include <linux/rtc.h> > +#include <linux/slab.h> > + > +/* > + * 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; > + static const 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; > + static const 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; > + static const 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; > + static const 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; > + static const 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; > + static const 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, > + "rtc-nct6694", 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 ret; > + > + device_init_wakeup(&pdev->dev, true); > + return 0; > +} > + > +static struct platform_driver nct6694_rtc_driver = { > + .driver = { > + .name = "rtc-nct6694", > + }, > + .probe = nct6694_rtc_probe, > +}; > + > +module_platform_driver(nct6694_rtc_driver); > + > +MODULE_DESCRIPTION("USB-RTC driver for NCT6694"); > +MODULE_AUTHOR("Ming Yu <tmyu0@nuvoton.com>"); > +MODULE_LICENSE("GPL"); > +MODULE_ALIAS("platform:nct6694-rtc"); > -- > 2.34.1 >
diff --git a/MAINTAINERS b/MAINTAINERS index a9eda4530b07..7eba4ffdc877 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -16927,6 +16927,7 @@ 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 0bbbf778ecfa..248425bf26f3 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..892674d453d1 --- /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 <linux/bcd.h> +#include <linux/irqdomain.h> +#include <linux/kernel.h> +#include <linux/mfd/core.h> +#include <linux/mfd/nct6694.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/rtc.h> +#include <linux/slab.h> + +/* + * 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; + static const 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; + static const 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; + static const 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; + static const 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; + static const 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; + static const 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, + "rtc-nct6694", 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 ret; + + device_init_wakeup(&pdev->dev, true); + return 0; +} + +static struct platform_driver nct6694_rtc_driver = { + .driver = { + .name = "rtc-nct6694", + }, + .probe = nct6694_rtc_probe, +}; + +module_platform_driver(nct6694_rtc_driver); + +MODULE_DESCRIPTION("USB-RTC driver for NCT6694"); +MODULE_AUTHOR("Ming Yu <tmyu0@nuvoton.com>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:nct6694-rtc");
This driver supports RTC functionality for NCT6694 MFD device based on USB interface. Signed-off-by: Ming Yu <a0282524688@gmail.com> --- 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