// SPDX-License-Identifier: GPL-2.0-only /* * An I2C driver for Ricoh RS5C372, R2025S/D and RV5C38[67] RTCs * * Copyright (C) 2005 Pavel Mironchik <[email protected]> * Copyright (C) 2006 Tower Technologies * Copyright (C) 2008 Paul Mundt */ #include <linux/i2c.h> #include <linux/rtc.h> #include <linux/bcd.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/of.h> /* * Ricoh has a family of I2C based RTCs, which differ only slightly from * each other. Differences center on pinout (e.g. how many interrupts, * output clock, etc) and how the control registers are used. The '372 * is significant only because that's the one this driver first supported. */ #define RS5C372_REG_SECS … #define RS5C372_REG_MINS … #define RS5C372_REG_HOURS … #define RS5C372_REG_WDAY … #define RS5C372_REG_DAY … #define RS5C372_REG_MONTH … #define RS5C372_REG_YEAR … #define RS5C372_REG_TRIM … #define RS5C372_TRIM_XSL … #define RS5C372_TRIM_MASK … #define R2221TL_TRIM_DEV … #define RS5C372_TRIM_DECR … #define RS5C_REG_ALARM_A_MIN … #define RS5C_REG_ALARM_A_HOURS … #define RS5C_REG_ALARM_A_WDAY … #define RS5C_REG_ALARM_B_MIN … #define RS5C_REG_ALARM_B_HOURS … #define RS5C_REG_ALARM_B_WDAY … #define RS5C_REG_CTRL1 … #define RS5C_CTRL1_AALE … #define RS5C_CTRL1_BALE … #define RV5C387_CTRL1_24 … #define RS5C372A_CTRL1_SL1 … #define RS5C_CTRL1_CT_MASK … #define RS5C_CTRL1_CT0 … #define RS5C_CTRL1_CT4 … #define RS5C_REG_CTRL2 … #define RS5C372_CTRL2_24 … #define RS5C_CTRL2_XSTP … #define R2x2x_CTRL2_VDET … #define R2x2x_CTRL2_XSTP … #define R2x2x_CTRL2_PON … #define RS5C_CTRL2_CTFG … #define RS5C_CTRL2_AAFG … #define RS5C_CTRL2_BAFG … /* to read (style 1) or write registers starting at R */ #define RS5C_ADDR(R) … enum rtc_type { … }; static const struct i2c_device_id rs5c372_id[] = …; MODULE_DEVICE_TABLE(i2c, rs5c372_id); static const __maybe_unused struct of_device_id rs5c372_of_match[] = …; MODULE_DEVICE_TABLE(of, rs5c372_of_match); /* REVISIT: this assumes that: * - we're in the 21st century, so it's safe to ignore the century * bit for rv5c38[67] (REG_MONTH bit 7); * - we should use ALARM_A not ALARM_B (may be wrong on some boards) */ struct rs5c372 { … }; static int rs5c_get_regs(struct rs5c372 *rs5c) { … } static unsigned rs5c_reg2hr(struct rs5c372 *rs5c, unsigned reg) { … } static unsigned rs5c_hr2reg(struct rs5c372 *rs5c, unsigned hour) { … } static int rs5c372_rtc_read_time(struct device *dev, struct rtc_time *tm) { … } static int rs5c372_rtc_set_time(struct device *dev, struct rtc_time *tm) { … } #if IS_ENABLED(CONFIG_RTC_INTF_PROC) #define NEED_TRIM #endif #if IS_ENABLED(CONFIG_RTC_INTF_SYSFS) #define NEED_TRIM #endif #ifdef NEED_TRIM static int rs5c372_get_trim(struct i2c_client *client, int *osc, int *trim) { … } #endif static int rs5c_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) { … } /* NOTE: Since RTC_WKALM_{RD,SET} were originally defined for EFI, * which only exposes a polled programming interface; and since * these calls map directly to those EFI requests; we don't demand * we have an IRQ for this chip when we go through this API. * * The older x86_pc derived RTC_ALM_{READ,SET} calls require irqs * though, managed through RTC_AIE_{ON,OFF} requests. */ static int rs5c_read_alarm(struct device *dev, struct rtc_wkalrm *t) { … } static int rs5c_set_alarm(struct device *dev, struct rtc_wkalrm *t) { … } #if IS_ENABLED(CONFIG_RTC_INTF_PROC) static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq) { … } #else #define rs5c372_rtc_proc … #endif #ifdef CONFIG_RTC_INTF_DEV static int rs5c372_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) { … } #else #define rs5c372_ioctl … #endif static int rs5c372_read_offset(struct device *dev, long *offset) { … } static int rs5c372_set_offset(struct device *dev, long offset) { … } static const struct rtc_class_ops rs5c372_rtc_ops = …; #if IS_ENABLED(CONFIG_RTC_INTF_SYSFS) static ssize_t rs5c372_sysfs_show_trim(struct device *dev, struct device_attribute *attr, char *buf) { … } static DEVICE_ATTR(trim, S_IRUGO, rs5c372_sysfs_show_trim, NULL); static ssize_t rs5c372_sysfs_show_osc(struct device *dev, struct device_attribute *attr, char *buf) { … } static DEVICE_ATTR(osc, S_IRUGO, rs5c372_sysfs_show_osc, NULL); static int rs5c_sysfs_register(struct device *dev) { … } static void rs5c_sysfs_unregister(struct device *dev) { … } #else static int rs5c_sysfs_register(struct device *dev) { return 0; } static void rs5c_sysfs_unregister(struct device *dev) { /* nothing */ } #endif /* SYSFS */ static struct i2c_driver rs5c372_driver; static int rs5c_oscillator_setup(struct rs5c372 *rs5c372) { … } static int rs5c372_probe(struct i2c_client *client) { … } static void rs5c372_remove(struct i2c_client *client) { … } static struct i2c_driver rs5c372_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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