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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/rtc/rtc-rx8010.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/rtc/rtc-rx8010.c')
-rw-r--r--drivers/rtc/rtc-rx8010.c431
1 files changed, 431 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-rx8010.c b/drivers/rtc/rtc-rx8010.c
new file mode 100644
index 000000000..d09056570
--- /dev/null
+++ b/drivers/rtc/rtc-rx8010.c
@@ -0,0 +1,431 @@
+// 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");