// SPDX-License-Identifier: GPL-2.0+ /* * Real Time Clock driver for Wolfson Microelectronics WM831x * * Copyright (C) 2009 Wolfson Microelectronics PLC. * * Author: Mark Brown <[email protected]> * */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/time.h> #include <linux/rtc.h> #include <linux/slab.h> #include <linux/bcd.h> #include <linux/interrupt.h> #include <linux/ioctl.h> #include <linux/completion.h> #include <linux/mfd/wm831x/core.h> #include <linux/delay.h> #include <linux/platform_device.h> #include <linux/random.h> /* * R16416 (0x4020) - RTC Write Counter */ #define WM831X_RTC_WR_CNT_MASK … #define WM831X_RTC_WR_CNT_SHIFT … #define WM831X_RTC_WR_CNT_WIDTH … /* * R16417 (0x4021) - RTC Time 1 */ #define WM831X_RTC_TIME_MASK … #define WM831X_RTC_TIME_SHIFT … #define WM831X_RTC_TIME_WIDTH … /* * R16418 (0x4022) - RTC Time 2 */ #define WM831X_RTC_TIME_MASK … #define WM831X_RTC_TIME_SHIFT … #define WM831X_RTC_TIME_WIDTH … /* * R16419 (0x4023) - RTC Alarm 1 */ #define WM831X_RTC_ALM_MASK … #define WM831X_RTC_ALM_SHIFT … #define WM831X_RTC_ALM_WIDTH … /* * R16420 (0x4024) - RTC Alarm 2 */ #define WM831X_RTC_ALM_MASK … #define WM831X_RTC_ALM_SHIFT … #define WM831X_RTC_ALM_WIDTH … /* * R16421 (0x4025) - RTC Control */ #define WM831X_RTC_VALID … #define WM831X_RTC_VALID_MASK … #define WM831X_RTC_VALID_SHIFT … #define WM831X_RTC_VALID_WIDTH … #define WM831X_RTC_SYNC_BUSY … #define WM831X_RTC_SYNC_BUSY_MASK … #define WM831X_RTC_SYNC_BUSY_SHIFT … #define WM831X_RTC_SYNC_BUSY_WIDTH … #define WM831X_RTC_ALM_ENA … #define WM831X_RTC_ALM_ENA_MASK … #define WM831X_RTC_ALM_ENA_SHIFT … #define WM831X_RTC_ALM_ENA_WIDTH … #define WM831X_RTC_PINT_FREQ_MASK … #define WM831X_RTC_PINT_FREQ_SHIFT … #define WM831X_RTC_PINT_FREQ_WIDTH … /* * R16422 (0x4026) - RTC Trim */ #define WM831X_RTC_TRIM_MASK … #define WM831X_RTC_TRIM_SHIFT … #define WM831X_RTC_TRIM_WIDTH … #define WM831X_SET_TIME_RETRIES … #define WM831X_GET_TIME_RETRIES … struct wm831x_rtc { … }; static void wm831x_rtc_add_randomness(struct wm831x *wm831x) { … } /* * Read current time and date in RTC */ static int wm831x_rtc_readtime(struct device *dev, struct rtc_time *tm) { … } /* * Set current time and date in RTC */ static int wm831x_rtc_settime(struct device *dev, struct rtc_time *tm) { … } /* * Read alarm time and date in RTC */ static int wm831x_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm) { … } static int wm831x_rtc_stop_alarm(struct wm831x_rtc *wm831x_rtc) { … } static int wm831x_rtc_start_alarm(struct wm831x_rtc *wm831x_rtc) { … } static int wm831x_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm) { … } static int wm831x_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) { … } static irqreturn_t wm831x_alm_irq(int irq, void *data) { … } static const struct rtc_class_ops wm831x_rtc_ops = …; #ifdef CONFIG_PM /* Turn off the alarm if it should not be a wake source. */ static int wm831x_rtc_suspend(struct device *dev) { … } /* Enable the alarm if it should be enabled (in case it was disabled to * prevent use as a wake source). */ static int wm831x_rtc_resume(struct device *dev) { … } /* Unconditionally disable the alarm */ static int wm831x_rtc_freeze(struct device *dev) { … } #else #define wm831x_rtc_suspend … #define wm831x_rtc_resume … #define wm831x_rtc_freeze … #endif static int wm831x_rtc_probe(struct platform_device *pdev) { … } static const struct dev_pm_ops wm831x_rtc_pm_ops = …; static struct platform_driver wm831x_rtc_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_ALIAS(…) …;
Codebase Browser
linux