436 lines
10 KiB
C
436 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Driver for the Epson RTC module RX-8010 SJ
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*
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* Copyright(C) Timesys Corporation 2015
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* Copyright(C) General Electric Company 2015
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*/
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#include <linux/bcd.h>
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#include <linux/bitops.h>
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/rtc.h>
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#define RX8010_SEC 0x10
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#define RX8010_MIN 0x11
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#define RX8010_HOUR 0x12
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#define RX8010_WDAY 0x13
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#define RX8010_MDAY 0x14
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#define RX8010_MONTH 0x15
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#define RX8010_YEAR 0x16
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#define RX8010_RESV17 0x17
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#define RX8010_ALMIN 0x18
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#define RX8010_ALHOUR 0x19
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#define RX8010_ALWDAY 0x1A
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#define RX8010_TCOUNT0 0x1B
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#define RX8010_TCOUNT1 0x1C
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#define RX8010_EXT 0x1D
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#define RX8010_FLAG 0x1E
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#define RX8010_CTRL 0x1F
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/* 0x20 to 0x2F are user registers */
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#define RX8010_RESV30 0x30
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#define RX8010_RESV31 0x31
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#define RX8010_IRQ 0x32
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#define RX8010_EXT_WADA BIT(3)
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#define RX8010_FLAG_VLF BIT(1)
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#define RX8010_FLAG_AF BIT(3)
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#define RX8010_FLAG_TF BIT(4)
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#define RX8010_FLAG_UF BIT(5)
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#define RX8010_CTRL_AIE BIT(3)
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#define RX8010_CTRL_UIE BIT(5)
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#define RX8010_CTRL_STOP BIT(6)
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#define RX8010_CTRL_TEST BIT(7)
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#define RX8010_ALARM_AE BIT(7)
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static const struct i2c_device_id rx8010_id[] = {
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{ "rx8010", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, rx8010_id);
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static const __maybe_unused struct of_device_id rx8010_of_match[] = {
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{ .compatible = "epson,rx8010" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, rx8010_of_match);
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struct rx8010_data {
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struct regmap *regs;
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struct rtc_device *rtc;
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u8 ctrlreg;
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};
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static irqreturn_t rx8010_irq_1_handler(int irq, void *dev_id)
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{
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struct i2c_client *client = dev_id;
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struct rx8010_data *rx8010 = i2c_get_clientdata(client);
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int flagreg, err;
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rtc_lock(rx8010->rtc);
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err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg);
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if (err) {
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rtc_unlock(rx8010->rtc);
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return IRQ_NONE;
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}
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if (flagreg & RX8010_FLAG_VLF)
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dev_warn(&client->dev, "Frequency stop detected\n");
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if (flagreg & RX8010_FLAG_TF) {
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flagreg &= ~RX8010_FLAG_TF;
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rtc_update_irq(rx8010->rtc, 1, RTC_PF | RTC_IRQF);
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}
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if (flagreg & RX8010_FLAG_AF) {
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flagreg &= ~RX8010_FLAG_AF;
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rtc_update_irq(rx8010->rtc, 1, RTC_AF | RTC_IRQF);
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}
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if (flagreg & RX8010_FLAG_UF) {
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flagreg &= ~RX8010_FLAG_UF;
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rtc_update_irq(rx8010->rtc, 1, RTC_UF | RTC_IRQF);
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}
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err = regmap_write(rx8010->regs, RX8010_FLAG, flagreg);
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rtc_unlock(rx8010->rtc);
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return err ? IRQ_NONE : IRQ_HANDLED;
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}
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static int rx8010_get_time(struct device *dev, struct rtc_time *dt)
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{
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struct rx8010_data *rx8010 = dev_get_drvdata(dev);
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u8 date[RX8010_YEAR - RX8010_SEC + 1];
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int flagreg, err;
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err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg);
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if (err)
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return err;
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if (flagreg & RX8010_FLAG_VLF) {
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dev_warn(dev, "Frequency stop detected\n");
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return -EINVAL;
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}
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err = regmap_bulk_read(rx8010->regs, RX8010_SEC, date, sizeof(date));
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if (err)
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return err;
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dt->tm_sec = bcd2bin(date[RX8010_SEC - RX8010_SEC] & 0x7f);
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dt->tm_min = bcd2bin(date[RX8010_MIN - RX8010_SEC] & 0x7f);
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dt->tm_hour = bcd2bin(date[RX8010_HOUR - RX8010_SEC] & 0x3f);
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dt->tm_mday = bcd2bin(date[RX8010_MDAY - RX8010_SEC] & 0x3f);
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dt->tm_mon = bcd2bin(date[RX8010_MONTH - RX8010_SEC] & 0x1f) - 1;
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dt->tm_year = bcd2bin(date[RX8010_YEAR - RX8010_SEC]) + 100;
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dt->tm_wday = ffs(date[RX8010_WDAY - RX8010_SEC] & 0x7f);
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return 0;
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}
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static int rx8010_set_time(struct device *dev, struct rtc_time *dt)
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{
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struct rx8010_data *rx8010 = dev_get_drvdata(dev);
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u8 date[RX8010_YEAR - RX8010_SEC + 1];
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int err;
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/* set STOP bit before changing clock/calendar */
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err = regmap_set_bits(rx8010->regs, RX8010_CTRL, RX8010_CTRL_STOP);
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if (err)
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return err;
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date[RX8010_SEC - RX8010_SEC] = bin2bcd(dt->tm_sec);
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date[RX8010_MIN - RX8010_SEC] = bin2bcd(dt->tm_min);
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date[RX8010_HOUR - RX8010_SEC] = bin2bcd(dt->tm_hour);
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date[RX8010_MDAY - RX8010_SEC] = bin2bcd(dt->tm_mday);
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date[RX8010_MONTH - RX8010_SEC] = bin2bcd(dt->tm_mon + 1);
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date[RX8010_YEAR - RX8010_SEC] = bin2bcd(dt->tm_year - 100);
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date[RX8010_WDAY - RX8010_SEC] = bin2bcd(1 << dt->tm_wday);
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err = regmap_bulk_write(rx8010->regs, RX8010_SEC, date, sizeof(date));
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if (err)
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return err;
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/* clear STOP bit after changing clock/calendar */
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err = regmap_clear_bits(rx8010->regs, RX8010_CTRL, RX8010_CTRL_STOP);
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if (err)
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return err;
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err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_VLF);
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if (err)
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return err;
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return 0;
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}
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static int rx8010_init(struct device *dev)
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{
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struct rx8010_data *rx8010 = dev_get_drvdata(dev);
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u8 ctrl[2];
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int need_clear = 0, err;
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/* Initialize reserved registers as specified in datasheet */
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err = regmap_write(rx8010->regs, RX8010_RESV17, 0xD8);
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if (err)
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return err;
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err = regmap_write(rx8010->regs, RX8010_RESV30, 0x00);
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if (err)
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return err;
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err = regmap_write(rx8010->regs, RX8010_RESV31, 0x08);
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if (err)
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return err;
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err = regmap_write(rx8010->regs, RX8010_IRQ, 0x00);
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if (err)
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return err;
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err = regmap_bulk_read(rx8010->regs, RX8010_FLAG, ctrl, 2);
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if (err)
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return err;
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if (ctrl[0] & RX8010_FLAG_VLF)
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dev_warn(dev, "Frequency stop was detected\n");
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if (ctrl[0] & RX8010_FLAG_AF) {
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dev_warn(dev, "Alarm was detected\n");
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need_clear = 1;
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}
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if (ctrl[0] & RX8010_FLAG_TF)
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need_clear = 1;
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if (ctrl[0] & RX8010_FLAG_UF)
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need_clear = 1;
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if (need_clear) {
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ctrl[0] &= ~(RX8010_FLAG_AF | RX8010_FLAG_TF | RX8010_FLAG_UF);
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err = regmap_write(rx8010->regs, RX8010_FLAG, ctrl[0]);
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if (err)
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return err;
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}
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rx8010->ctrlreg = (ctrl[1] & ~RX8010_CTRL_TEST);
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return 0;
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}
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static int rx8010_read_alarm(struct device *dev, struct rtc_wkalrm *t)
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{
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struct rx8010_data *rx8010 = dev_get_drvdata(dev);
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u8 alarmvals[3];
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int flagreg, err;
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err = regmap_bulk_read(rx8010->regs, RX8010_ALMIN, alarmvals, 3);
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if (err)
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return err;
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err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg);
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if (err)
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return err;
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t->time.tm_sec = 0;
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t->time.tm_min = bcd2bin(alarmvals[0] & 0x7f);
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t->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);
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if (!(alarmvals[2] & RX8010_ALARM_AE))
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t->time.tm_mday = bcd2bin(alarmvals[2] & 0x7f);
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t->enabled = !!(rx8010->ctrlreg & RX8010_CTRL_AIE);
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t->pending = (flagreg & RX8010_FLAG_AF) && t->enabled;
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return 0;
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}
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static int rx8010_set_alarm(struct device *dev, struct rtc_wkalrm *t)
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{
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struct rx8010_data *rx8010 = dev_get_drvdata(dev);
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u8 alarmvals[3];
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int err;
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if (rx8010->ctrlreg & (RX8010_CTRL_AIE | RX8010_CTRL_UIE)) {
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rx8010->ctrlreg &= ~(RX8010_CTRL_AIE | RX8010_CTRL_UIE);
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err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg);
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if (err)
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return err;
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}
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err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_AF);
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if (err)
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return err;
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alarmvals[0] = bin2bcd(t->time.tm_min);
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alarmvals[1] = bin2bcd(t->time.tm_hour);
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alarmvals[2] = bin2bcd(t->time.tm_mday);
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err = regmap_bulk_write(rx8010->regs, RX8010_ALMIN, alarmvals, 2);
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if (err)
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return err;
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err = regmap_clear_bits(rx8010->regs, RX8010_EXT, RX8010_EXT_WADA);
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if (err)
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return err;
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if (alarmvals[2] == 0)
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alarmvals[2] |= RX8010_ALARM_AE;
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err = regmap_write(rx8010->regs, RX8010_ALWDAY, alarmvals[2]);
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if (err)
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return err;
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if (t->enabled) {
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if (rx8010->rtc->uie_rtctimer.enabled)
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rx8010->ctrlreg |= RX8010_CTRL_UIE;
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if (rx8010->rtc->aie_timer.enabled)
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rx8010->ctrlreg |=
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(RX8010_CTRL_AIE | RX8010_CTRL_UIE);
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err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg);
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if (err)
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return err;
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}
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return 0;
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}
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static int rx8010_alarm_irq_enable(struct device *dev,
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unsigned int enabled)
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{
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struct rx8010_data *rx8010 = dev_get_drvdata(dev);
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int err;
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u8 ctrl;
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ctrl = rx8010->ctrlreg;
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if (enabled) {
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if (rx8010->rtc->uie_rtctimer.enabled)
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ctrl |= RX8010_CTRL_UIE;
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if (rx8010->rtc->aie_timer.enabled)
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ctrl |= (RX8010_CTRL_AIE | RX8010_CTRL_UIE);
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} else {
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if (!rx8010->rtc->uie_rtctimer.enabled)
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ctrl &= ~RX8010_CTRL_UIE;
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if (!rx8010->rtc->aie_timer.enabled)
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ctrl &= ~RX8010_CTRL_AIE;
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}
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err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_AF);
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if (err)
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return err;
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if (ctrl != rx8010->ctrlreg) {
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rx8010->ctrlreg = ctrl;
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err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg);
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if (err)
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return err;
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}
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return 0;
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}
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static int rx8010_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
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{
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struct rx8010_data *rx8010 = dev_get_drvdata(dev);
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int tmp, flagreg, err;
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switch (cmd) {
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case RTC_VL_READ:
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err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg);
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if (err)
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return err;
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tmp = flagreg & RX8010_FLAG_VLF ? RTC_VL_DATA_INVALID : 0;
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return put_user(tmp, (unsigned int __user *)arg);
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default:
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return -ENOIOCTLCMD;
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}
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}
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static const struct rtc_class_ops rx8010_rtc_ops = {
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.read_time = rx8010_get_time,
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.set_time = rx8010_set_time,
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.ioctl = rx8010_ioctl,
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.read_alarm = rx8010_read_alarm,
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.set_alarm = rx8010_set_alarm,
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.alarm_irq_enable = rx8010_alarm_irq_enable,
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};
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static const struct regmap_config rx8010_regmap_config = {
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.name = "rx8010-rtc",
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.reg_bits = 8,
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.val_bits = 8,
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};
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static int rx8010_probe(struct i2c_client *client)
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{
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struct device *dev = &client->dev;
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struct rx8010_data *rx8010;
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int err = 0;
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rx8010 = devm_kzalloc(dev, sizeof(*rx8010), GFP_KERNEL);
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if (!rx8010)
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return -ENOMEM;
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i2c_set_clientdata(client, rx8010);
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rx8010->regs = devm_regmap_init_i2c(client, &rx8010_regmap_config);
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if (IS_ERR(rx8010->regs))
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return PTR_ERR(rx8010->regs);
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err = rx8010_init(dev);
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if (err)
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return err;
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rx8010->rtc = devm_rtc_allocate_device(dev);
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if (IS_ERR(rx8010->rtc))
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return PTR_ERR(rx8010->rtc);
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if (client->irq > 0) {
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unsigned long irqflags = IRQF_TRIGGER_LOW;
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if (dev_fwnode(&client->dev))
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irqflags = 0;
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err = devm_request_threaded_irq(dev, client->irq, NULL,
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rx8010_irq_1_handler,
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irqflags | IRQF_ONESHOT,
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"rx8010", client);
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if (err) {
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dev_err(dev, "unable to request IRQ\n");
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return err;
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}
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} else {
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clear_bit(RTC_FEATURE_ALARM, rx8010->rtc->features);
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}
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rx8010->rtc->ops = &rx8010_rtc_ops;
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rx8010->rtc->max_user_freq = 1;
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rx8010->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
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rx8010->rtc->range_max = RTC_TIMESTAMP_END_2099;
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return devm_rtc_register_device(rx8010->rtc);
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}
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static struct i2c_driver rx8010_driver = {
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.driver = {
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.name = "rtc-rx8010",
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.of_match_table = of_match_ptr(rx8010_of_match),
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},
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.probe = rx8010_probe,
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.id_table = rx8010_id,
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};
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module_i2c_driver(rx8010_driver);
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MODULE_AUTHOR("Akshay Bhat <akshay.bhat@timesys.com>");
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MODULE_DESCRIPTION("Epson RX8010SJ RTC driver");
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MODULE_LICENSE("GPL v2");
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