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linux/drivers/rtc/rtc-rx8010.c
Alexandre Belloni 4bbdced5db rtc: rx8010: use IRQ flags obtained from fwnode 
Allow the IRQ type to be passed from the device tree if available as there
may be components changing the trigger type of the interrupt between the
RTC and the IRQ controller.

Link: https://lore.kernel.org/r/20230123200217.1236011-1-alexandre.belloni@bootlin.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2023-02-01 09:13:35 +01:00

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