v4.19.13 snapshot.
diff --git a/drivers/rtc/rtc-s35390a.c b/drivers/rtc/rtc-s35390a.c
new file mode 100644
index 0000000..77feb60
--- /dev/null
+++ b/drivers/rtc/rtc-s35390a.c
@@ -0,0 +1,545 @@
+/*
+ * Seiko Instruments S-35390A RTC Driver
+ *
+ * Copyright (c) 2007 Byron Bradley
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/rtc.h>
+#include <linux/i2c.h>
+#include <linux/bitrev.h>
+#include <linux/bcd.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define S35390A_CMD_STATUS1 0
+#define S35390A_CMD_STATUS2 1
+#define S35390A_CMD_TIME1 2
+#define S35390A_CMD_TIME2 3
+#define S35390A_CMD_INT2_REG1 5
+
+#define S35390A_BYTE_YEAR 0
+#define S35390A_BYTE_MONTH 1
+#define S35390A_BYTE_DAY 2
+#define S35390A_BYTE_WDAY 3
+#define S35390A_BYTE_HOURS 4
+#define S35390A_BYTE_MINS 5
+#define S35390A_BYTE_SECS 6
+
+#define S35390A_ALRM_BYTE_WDAY 0
+#define S35390A_ALRM_BYTE_HOURS 1
+#define S35390A_ALRM_BYTE_MINS 2
+
+/* flags for STATUS1 */
+#define S35390A_FLAG_POC 0x01
+#define S35390A_FLAG_BLD 0x02
+#define S35390A_FLAG_INT2 0x04
+#define S35390A_FLAG_24H 0x40
+#define S35390A_FLAG_RESET 0x80
+
+/* flag for STATUS2 */
+#define S35390A_FLAG_TEST 0x01
+
+#define S35390A_INT2_MODE_MASK 0xF0
+
+#define S35390A_INT2_MODE_NOINTR 0x00
+#define S35390A_INT2_MODE_FREQ 0x10
+#define S35390A_INT2_MODE_ALARM 0x40
+#define S35390A_INT2_MODE_PMIN_EDG 0x20
+
+static const struct i2c_device_id s35390a_id[] = {
+ { "s35390a", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, s35390a_id);
+
+static const struct of_device_id s35390a_of_match[] = {
+ { .compatible = "s35390a" },
+ { .compatible = "sii,s35390a" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, s35390a_of_match);
+
+struct s35390a {
+ struct i2c_client *client[8];
+ struct rtc_device *rtc;
+ int twentyfourhour;
+};
+
+static int s35390a_set_reg(struct s35390a *s35390a, int reg, char *buf, int len)
+{
+ struct i2c_client *client = s35390a->client[reg];
+ struct i2c_msg msg[] = {
+ {
+ .addr = client->addr,
+ .len = len,
+ .buf = buf
+ },
+ };
+
+ if ((i2c_transfer(client->adapter, msg, 1)) != 1)
+ return -EIO;
+
+ return 0;
+}
+
+static int s35390a_get_reg(struct s35390a *s35390a, int reg, char *buf, int len)
+{
+ struct i2c_client *client = s35390a->client[reg];
+ struct i2c_msg msg[] = {
+ {
+ .addr = client->addr,
+ .flags = I2C_M_RD,
+ .len = len,
+ .buf = buf
+ },
+ };
+
+ if ((i2c_transfer(client->adapter, msg, 1)) != 1)
+ return -EIO;
+
+ return 0;
+}
+
+static int s35390a_init(struct s35390a *s35390a)
+{
+ char buf;
+ int ret;
+ unsigned initcount = 0;
+
+ /*
+ * At least one of POC and BLD are set, so reinitialise chip. Keeping
+ * this information in the hardware to know later that the time isn't
+ * valid is unfortunately not possible because POC and BLD are cleared
+ * on read. So the reset is best done now.
+ *
+ * The 24H bit is kept over reset, so set it already here.
+ */
+initialize:
+ buf = S35390A_FLAG_RESET | S35390A_FLAG_24H;
+ ret = s35390a_set_reg(s35390a, S35390A_CMD_STATUS1, &buf, 1);
+
+ if (ret < 0)
+ return ret;
+
+ ret = s35390a_get_reg(s35390a, S35390A_CMD_STATUS1, &buf, 1);
+ if (ret < 0)
+ return ret;
+
+ if (buf & (S35390A_FLAG_POC | S35390A_FLAG_BLD)) {
+ /* Try up to five times to reset the chip */
+ if (initcount < 5) {
+ ++initcount;
+ goto initialize;
+ } else
+ return -EIO;
+ }
+
+ return 1;
+}
+
+/*
+ * Returns <0 on error, 0 if rtc is setup fine and 1 if the chip was reset.
+ * To keep the information if an irq is pending, pass the value read from
+ * STATUS1 to the caller.
+ */
+static int s35390a_read_status(struct s35390a *s35390a, char *status1)
+{
+ int ret;
+
+ ret = s35390a_get_reg(s35390a, S35390A_CMD_STATUS1, status1, 1);
+ if (ret < 0)
+ return ret;
+
+ if (*status1 & S35390A_FLAG_POC) {
+ /*
+ * Do not communicate for 0.5 seconds since the power-on
+ * detection circuit is in operation.
+ */
+ msleep(500);
+ return 1;
+ } else if (*status1 & S35390A_FLAG_BLD)
+ return 1;
+ /*
+ * If both POC and BLD are unset everything is fine.
+ */
+ return 0;
+}
+
+static int s35390a_disable_test_mode(struct s35390a *s35390a)
+{
+ char buf[1];
+
+ if (s35390a_get_reg(s35390a, S35390A_CMD_STATUS2, buf, sizeof(buf)) < 0)
+ return -EIO;
+
+ if (!(buf[0] & S35390A_FLAG_TEST))
+ return 0;
+
+ buf[0] &= ~S35390A_FLAG_TEST;
+ return s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, buf, sizeof(buf));
+}
+
+static char s35390a_hr2reg(struct s35390a *s35390a, int hour)
+{
+ if (s35390a->twentyfourhour)
+ return bin2bcd(hour);
+
+ if (hour < 12)
+ return bin2bcd(hour);
+
+ return 0x40 | bin2bcd(hour - 12);
+}
+
+static int s35390a_reg2hr(struct s35390a *s35390a, char reg)
+{
+ unsigned hour;
+
+ if (s35390a->twentyfourhour)
+ return bcd2bin(reg & 0x3f);
+
+ hour = bcd2bin(reg & 0x3f);
+ if (reg & 0x40)
+ hour += 12;
+
+ return hour;
+}
+
+static int s35390a_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct s35390a *s35390a = i2c_get_clientdata(client);
+ int i, err;
+ char buf[7], status;
+
+ dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d mday=%d, "
+ "mon=%d, year=%d, wday=%d\n", __func__, tm->tm_sec,
+ tm->tm_min, tm->tm_hour, tm->tm_mday, tm->tm_mon, tm->tm_year,
+ tm->tm_wday);
+
+ if (s35390a_read_status(s35390a, &status) == 1)
+ s35390a_init(s35390a);
+
+ buf[S35390A_BYTE_YEAR] = bin2bcd(tm->tm_year - 100);
+ buf[S35390A_BYTE_MONTH] = bin2bcd(tm->tm_mon + 1);
+ buf[S35390A_BYTE_DAY] = bin2bcd(tm->tm_mday);
+ buf[S35390A_BYTE_WDAY] = bin2bcd(tm->tm_wday);
+ buf[S35390A_BYTE_HOURS] = s35390a_hr2reg(s35390a, tm->tm_hour);
+ buf[S35390A_BYTE_MINS] = bin2bcd(tm->tm_min);
+ buf[S35390A_BYTE_SECS] = bin2bcd(tm->tm_sec);
+
+ /* This chip expects the bits of each byte to be in reverse order */
+ for (i = 0; i < 7; ++i)
+ buf[i] = bitrev8(buf[i]);
+
+ err = s35390a_set_reg(s35390a, S35390A_CMD_TIME1, buf, sizeof(buf));
+
+ return err;
+}
+
+static int s35390a_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct s35390a *s35390a = i2c_get_clientdata(client);
+ char buf[7], status;
+ int i, err;
+
+ if (s35390a_read_status(s35390a, &status) == 1)
+ return -EINVAL;
+
+ err = s35390a_get_reg(s35390a, S35390A_CMD_TIME1, buf, sizeof(buf));
+ if (err < 0)
+ return err;
+
+ /* This chip returns the bits of each byte in reverse order */
+ for (i = 0; i < 7; ++i)
+ buf[i] = bitrev8(buf[i]);
+
+ tm->tm_sec = bcd2bin(buf[S35390A_BYTE_SECS]);
+ tm->tm_min = bcd2bin(buf[S35390A_BYTE_MINS]);
+ tm->tm_hour = s35390a_reg2hr(s35390a, buf[S35390A_BYTE_HOURS]);
+ tm->tm_wday = bcd2bin(buf[S35390A_BYTE_WDAY]);
+ tm->tm_mday = bcd2bin(buf[S35390A_BYTE_DAY]);
+ tm->tm_mon = bcd2bin(buf[S35390A_BYTE_MONTH]) - 1;
+ tm->tm_year = bcd2bin(buf[S35390A_BYTE_YEAR]) + 100;
+
+ dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, mday=%d, "
+ "mon=%d, year=%d, wday=%d\n", __func__, tm->tm_sec,
+ tm->tm_min, tm->tm_hour, tm->tm_mday, tm->tm_mon, tm->tm_year,
+ tm->tm_wday);
+
+ return 0;
+}
+
+static int s35390a_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct s35390a *s35390a = i2c_get_clientdata(client);
+ char buf[3], sts = 0;
+ int err, i;
+
+ dev_dbg(&client->dev, "%s: alm is secs=%d, mins=%d, hours=%d mday=%d, "\
+ "mon=%d, year=%d, wday=%d\n", __func__, alm->time.tm_sec,
+ alm->time.tm_min, alm->time.tm_hour, alm->time.tm_mday,
+ alm->time.tm_mon, alm->time.tm_year, alm->time.tm_wday);
+
+ /* disable interrupt (which deasserts the irq line) */
+ err = s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, &sts, sizeof(sts));
+ if (err < 0)
+ return err;
+
+ /* clear pending interrupt (in STATUS1 only), if any */
+ err = s35390a_get_reg(s35390a, S35390A_CMD_STATUS1, &sts, sizeof(sts));
+ if (err < 0)
+ return err;
+
+ if (alm->enabled)
+ sts = S35390A_INT2_MODE_ALARM;
+ else
+ sts = S35390A_INT2_MODE_NOINTR;
+
+ /* This chip expects the bits of each byte to be in reverse order */
+ sts = bitrev8(sts);
+
+ /* set interupt mode*/
+ err = s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, &sts, sizeof(sts));
+ if (err < 0)
+ return err;
+
+ if (alm->time.tm_wday != -1)
+ buf[S35390A_ALRM_BYTE_WDAY] = bin2bcd(alm->time.tm_wday) | 0x80;
+ else
+ buf[S35390A_ALRM_BYTE_WDAY] = 0;
+
+ buf[S35390A_ALRM_BYTE_HOURS] = s35390a_hr2reg(s35390a,
+ alm->time.tm_hour) | 0x80;
+ buf[S35390A_ALRM_BYTE_MINS] = bin2bcd(alm->time.tm_min) | 0x80;
+
+ if (alm->time.tm_hour >= 12)
+ buf[S35390A_ALRM_BYTE_HOURS] |= 0x40;
+
+ for (i = 0; i < 3; ++i)
+ buf[i] = bitrev8(buf[i]);
+
+ err = s35390a_set_reg(s35390a, S35390A_CMD_INT2_REG1, buf,
+ sizeof(buf));
+
+ return err;
+}
+
+static int s35390a_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct s35390a *s35390a = i2c_get_clientdata(client);
+ char buf[3], sts;
+ int i, err;
+
+ err = s35390a_get_reg(s35390a, S35390A_CMD_STATUS2, &sts, sizeof(sts));
+ if (err < 0)
+ return err;
+
+ if ((bitrev8(sts) & S35390A_INT2_MODE_MASK) != S35390A_INT2_MODE_ALARM) {
+ /*
+ * When the alarm isn't enabled, the register to configure
+ * the alarm time isn't accessible.
+ */
+ alm->enabled = 0;
+ return 0;
+ } else {
+ alm->enabled = 1;
+ }
+
+ err = s35390a_get_reg(s35390a, S35390A_CMD_INT2_REG1, buf, sizeof(buf));
+ if (err < 0)
+ return err;
+
+ /* This chip returns the bits of each byte in reverse order */
+ for (i = 0; i < 3; ++i)
+ buf[i] = bitrev8(buf[i]);
+
+ /*
+ * B0 of the three matching registers is an enable flag. Iff it is set
+ * the configured value is used for matching.
+ */
+ if (buf[S35390A_ALRM_BYTE_WDAY] & 0x80)
+ alm->time.tm_wday =
+ bcd2bin(buf[S35390A_ALRM_BYTE_WDAY] & ~0x80);
+
+ if (buf[S35390A_ALRM_BYTE_HOURS] & 0x80)
+ alm->time.tm_hour =
+ s35390a_reg2hr(s35390a,
+ buf[S35390A_ALRM_BYTE_HOURS] & ~0x80);
+
+ if (buf[S35390A_ALRM_BYTE_MINS] & 0x80)
+ alm->time.tm_min = bcd2bin(buf[S35390A_ALRM_BYTE_MINS] & ~0x80);
+
+ /* alarm triggers always at s=0 */
+ alm->time.tm_sec = 0;
+
+ dev_dbg(&client->dev, "%s: alm is mins=%d, hours=%d, wday=%d\n",
+ __func__, alm->time.tm_min, alm->time.tm_hour,
+ alm->time.tm_wday);
+
+ return 0;
+}
+
+static int s35390a_rtc_ioctl(struct device *dev, unsigned int cmd,
+ unsigned long arg)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct s35390a *s35390a = i2c_get_clientdata(client);
+ char sts;
+ int err;
+
+ switch (cmd) {
+ case RTC_VL_READ:
+ /* s35390a_reset set lowvoltage flag and init RTC if needed */
+ err = s35390a_read_status(s35390a, &sts);
+ if (err < 0)
+ return err;
+ if (copy_to_user((void __user *)arg, &err, sizeof(int)))
+ return -EFAULT;
+ break;
+ case RTC_VL_CLR:
+ /* update flag and clear register */
+ err = s35390a_init(s35390a);
+ if (err < 0)
+ return err;
+ break;
+ default:
+ return -ENOIOCTLCMD;
+ }
+
+ return 0;
+}
+
+static const struct rtc_class_ops s35390a_rtc_ops = {
+ .read_time = s35390a_rtc_read_time,
+ .set_time = s35390a_rtc_set_time,
+ .set_alarm = s35390a_rtc_set_alarm,
+ .read_alarm = s35390a_rtc_read_alarm,
+ .ioctl = s35390a_rtc_ioctl,
+};
+
+static struct i2c_driver s35390a_driver;
+
+static int s35390a_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int err, err_read;
+ unsigned int i;
+ struct s35390a *s35390a;
+ char buf, status1;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ err = -ENODEV;
+ goto exit;
+ }
+
+ s35390a = devm_kzalloc(&client->dev, sizeof(struct s35390a),
+ GFP_KERNEL);
+ if (!s35390a) {
+ err = -ENOMEM;
+ goto exit;
+ }
+
+ s35390a->client[0] = client;
+ i2c_set_clientdata(client, s35390a);
+
+ /* This chip uses multiple addresses, use dummy devices for them */
+ for (i = 1; i < 8; ++i) {
+ s35390a->client[i] = i2c_new_dummy(client->adapter,
+ client->addr + i);
+ if (!s35390a->client[i]) {
+ dev_err(&client->dev, "Address %02x unavailable\n",
+ client->addr + i);
+ err = -EBUSY;
+ goto exit_dummy;
+ }
+ }
+
+ err_read = s35390a_read_status(s35390a, &status1);
+ if (err_read < 0) {
+ err = err_read;
+ dev_err(&client->dev, "error resetting chip\n");
+ goto exit_dummy;
+ }
+
+ if (status1 & S35390A_FLAG_24H)
+ s35390a->twentyfourhour = 1;
+ else
+ s35390a->twentyfourhour = 0;
+
+ if (status1 & S35390A_FLAG_INT2) {
+ /* disable alarm (and maybe test mode) */
+ buf = 0;
+ err = s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, &buf, 1);
+ if (err < 0) {
+ dev_err(&client->dev, "error disabling alarm");
+ goto exit_dummy;
+ }
+ } else {
+ err = s35390a_disable_test_mode(s35390a);
+ if (err < 0) {
+ dev_err(&client->dev, "error disabling test mode\n");
+ goto exit_dummy;
+ }
+ }
+
+ device_set_wakeup_capable(&client->dev, 1);
+
+ s35390a->rtc = devm_rtc_device_register(&client->dev,
+ s35390a_driver.driver.name,
+ &s35390a_rtc_ops, THIS_MODULE);
+
+ if (IS_ERR(s35390a->rtc)) {
+ err = PTR_ERR(s35390a->rtc);
+ goto exit_dummy;
+ }
+
+ if (status1 & S35390A_FLAG_INT2)
+ rtc_update_irq(s35390a->rtc, 1, RTC_AF);
+
+ return 0;
+
+exit_dummy:
+ for (i = 1; i < 8; ++i)
+ if (s35390a->client[i])
+ i2c_unregister_device(s35390a->client[i]);
+
+exit:
+ return err;
+}
+
+static int s35390a_remove(struct i2c_client *client)
+{
+ unsigned int i;
+ struct s35390a *s35390a = i2c_get_clientdata(client);
+
+ for (i = 1; i < 8; ++i)
+ if (s35390a->client[i])
+ i2c_unregister_device(s35390a->client[i]);
+
+ return 0;
+}
+
+static struct i2c_driver s35390a_driver = {
+ .driver = {
+ .name = "rtc-s35390a",
+ .of_match_table = of_match_ptr(s35390a_of_match),
+ },
+ .probe = s35390a_probe,
+ .remove = s35390a_remove,
+ .id_table = s35390a_id,
+};
+
+module_i2c_driver(s35390a_driver);
+
+MODULE_AUTHOR("Byron Bradley <byron.bbradley@gmail.com>");
+MODULE_DESCRIPTION("S35390A RTC driver");
+MODULE_LICENSE("GPL");