mirror of
https://github.com/torvalds/linux.git
synced 2024-11-30 08:01:59 +00:00
782d3ebfcf
When CONFIG_OF is disabled then the matching table is not referenced. Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Link: https://lore.kernel.org/r/20210202112219.3610853-19-alexandre.belloni@bootlin.com
432 lines
10 KiB
C
432 lines
10 KiB
C
// 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) {
|
|
dev_info(dev, "IRQ %d supplied\n", client->irq);
|
|
err = devm_request_threaded_irq(dev, client->irq, NULL,
|
|
rx8010_irq_1_handler,
|
|
IRQF_TRIGGER_LOW | 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");
|