// SPDX-License-Identifier: GPL-2.0-only /* * Driver for Epson's RTC module RX-8025 SA/NB * * Copyright (C) 2009 Wolfgang Grandegger <[email protected]> * * Copyright (C) 2005 by Digi International Inc. * All rights reserved. * * Modified by fengjh at rising.com.cn * <[email protected]> * 2006.11 * * Code cleanup by Sergei Poselenov, <[email protected]> * Converted to new style by Wolfgang Grandegger <[email protected]> * Alarm and periodic interrupt added by Dmitry Rakhchev <[email protected]> */ #include <linux/bcd.h> #include <linux/bitops.h> #include <linux/i2c.h> #include <linux/kernel.h> #include <linux/kstrtox.h> #include <linux/module.h> #include <linux/rtc.h> /* Register definitions */ #define RX8025_REG_SEC … #define RX8025_REG_MIN … #define RX8025_REG_HOUR … #define RX8025_REG_WDAY … #define RX8025_REG_MDAY … #define RX8025_REG_MONTH … #define RX8025_REG_YEAR … #define RX8025_REG_DIGOFF … #define RX8025_REG_ALWMIN … #define RX8025_REG_ALWHOUR … #define RX8025_REG_ALWWDAY … #define RX8025_REG_ALDMIN … #define RX8025_REG_ALDHOUR … /* 0x0d is reserved */ #define RX8025_REG_CTRL1 … #define RX8025_REG_CTRL2 … #define RX8025_BIT_CTRL1_CT … /* 1 Hz periodic level irq */ #define RX8025_BIT_CTRL1_CT_1HZ … #define RX8025_BIT_CTRL1_TEST … #define RX8025_BIT_CTRL1_1224 … #define RX8025_BIT_CTRL1_DALE … #define RX8025_BIT_CTRL1_WALE … #define RX8025_BIT_CTRL2_DAFG … #define RX8025_BIT_CTRL2_WAFG … #define RX8025_BIT_CTRL2_CTFG … #define RX8025_BIT_CTRL2_PON … #define RX8025_BIT_CTRL2_XST … #define RX8025_BIT_CTRL2_VDET … #define RX8035_BIT_HOUR_1224 … /* Clock precision adjustment */ #define RX8025_ADJ_RESOLUTION … #define RX8025_ADJ_DATA_MAX … #define RX8025_ADJ_DATA_MIN … enum rx_model { … }; static const struct i2c_device_id rx8025_id[] = …; MODULE_DEVICE_TABLE(i2c, rx8025_id); struct rx8025_data { … }; static s32 rx8025_read_reg(const struct i2c_client *client, u8 number) { … } static int rx8025_read_regs(const struct i2c_client *client, u8 number, u8 length, u8 *values) { … } static s32 rx8025_write_reg(const struct i2c_client *client, u8 number, u8 value) { … } static s32 rx8025_write_regs(const struct i2c_client *client, u8 number, u8 length, const u8 *values) { … } static int rx8025_is_osc_stopped(enum rx_model model, int ctrl2) { … } static int rx8025_check_validity(struct device *dev) { … } static int rx8025_reset_validity(struct i2c_client *client) { … } static irqreturn_t rx8025_handle_irq(int irq, void *dev_id) { … } static int rx8025_get_time(struct device *dev, struct rtc_time *dt) { … } static int rx8025_set_time(struct device *dev, struct rtc_time *dt) { … } static int rx8025_init_client(struct i2c_client *client) { … } /* Alarm support */ static int rx8025_read_alarm(struct device *dev, struct rtc_wkalrm *t) { … } static int rx8025_set_alarm(struct device *dev, struct rtc_wkalrm *t) { … } static int rx8025_alarm_irq_enable(struct device *dev, unsigned int enabled) { … } /* * According to the RX8025 SA/NB application manual the frequency and * temperature characteristics can be approximated using the following * equation: * * df = a * (ut - t)**2 * * df: Frequency deviation in any temperature * a : Coefficient = (-35 +-5) * 10**-9 * ut: Ultimate temperature in degree = +25 +-5 degree * t : Any temperature in degree */ static int rx8025_read_offset(struct device *dev, long *offset) { … } static int rx8025_set_offset(struct device *dev, long offset) { … } static const struct rtc_class_ops rx8025_rtc_ops = …; static ssize_t rx8025_sysfs_show_clock_adjust(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t rx8025_sysfs_store_clock_adjust(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static DEVICE_ATTR(clock_adjust_ppb, S_IRUGO | S_IWUSR, rx8025_sysfs_show_clock_adjust, rx8025_sysfs_store_clock_adjust); static struct attribute *rx8025_attrs[] = …; static const struct attribute_group rx8025_attr_group = …; static int rx8025_probe(struct i2c_client *client) { … } static struct i2c_driver rx8025_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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