@@ -695,6 +695,14 @@ config RTC_DRV_R9701
This driver can also be built as a module. If so, the module
will be called rtc-r9701.
+config RTC_DRV_RX4035
+ tristate "Epson RX-4035"
+ help
+ If you say yes here you will get support for the Epson RX-4035.
+
+ This driver can also be built as a module. If so the module
+ will be called rtc-rx4035.
+
config RTC_DRV_RX4581
tristate "Epson RX-4581"
help
@@ -129,6 +129,7 @@ obj-$(CONFIG_RTC_DRV_RS5C348) += rtc-rs5c348.o
obj-$(CONFIG_RTC_DRV_RS5C372) += rtc-rs5c372.o
obj-$(CONFIG_RTC_DRV_RV3029C2) += rtc-rv3029c2.o
obj-$(CONFIG_RTC_DRV_RV8803) += rtc-rv8803.o
+obj-$(CONFIG_RTC_DRV_RX4035) += rtc-rx4035.o
obj-$(CONFIG_RTC_DRV_RX4581) += rtc-rx4581.o
obj-$(CONFIG_RTC_DRV_RX6110) += rtc-rx6110.o
obj-$(CONFIG_RTC_DRV_RX8010) += rtc-rx8010.o
new file mode 100644
@@ -0,0 +1,222 @@
+/* drivers/rtc/rtc-rx4035.c
+ *
+ * written by Ryan Jones <ryan@rjones.io>
+ *
+ * RTC SPI Driver for Epson RX4035
+ *
+ * Based on:
+ * drivers/rtc/rtc-rx4581.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/rtc.h>
+#include <linux/spi/spi.h>
+#include <linux/bcd.h>
+
+#define RX4035_REG_SC 0x00 /* Second in BCD */
+#define RX4035_REG_MN 0x01 /* Minute in BCD */
+#define RX4035_REG_HR 0x02 /* Hour in BCD */
+#define RX4035_REG_DW 0x03 /* Day of Week */
+#define RX4035_REG_DM 0x04 /* Day of Month in BCD */
+#define RX4035_REG_MO 0x05 /* Month in BCD */
+#define RX4035_REG_YR 0x06 /* Year in BCD */
+#define RX4035_REG_RAM 0x0D /* RAM */
+#define RX4035_REG_CTL1 0x0E /* Control Register 1*/
+#define RX4035_REG_CTL2 0x0F /* Control Register 2*/
+
+/* Flag Register bit definitions */
+#define RX4035_FLAG_VDET 0x40 /* Low Voltage Detection */
+#define RX4035_FLAG_PON 0x10 /* Indicates a Power On condition */
+
+static int rx4035_set_reg(struct spi_device *spi, unsigned char address,
+ unsigned char data)
+{
+ unsigned char buf[2];
+
+ /*Set MSB to indicate a write transfer*/
+ buf[0] = (address<<4) | 0x08;
+ buf[1] = data;
+
+ return spi_write_then_read(spi, buf, 2, NULL, 0);
+}
+
+static int rx4035_get_reg(struct spi_device *spi, unsigned char address,
+ unsigned char *data)
+{
+ /*Set MSB to indicate a write transfer*/
+ *data = (address<<4) | 0x0c;
+
+ return spi_write_then_read(spi, data, 1, data, 1);
+}
+
+/*
+ * In the routines that deal directly with the rx4035 hardware, we use
+ * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
+ */
+static int rx4035_get_datetime(struct device *dev, struct rtc_time *tm)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ unsigned char date[7];
+ unsigned char data;
+ int err;
+
+ /*Check that data is reliable*/
+ err = rx4035_get_reg(spi, RX4035_REG_CTL1, &data);
+ if (err != 0) {
+ dev_err(dev, "Unable to read control register\n");
+ return -EIO;
+ }
+ if (data & (RX4035_FLAG_VDET | RX4035_FLAG_PON))
+ dev_err(dev, "RTC DATA UNRELIABLE - battery voltage fell below minimum value\n");
+
+ /* Read time and date */
+ date[0] = 0x04;
+ err = spi_write_then_read(spi, date, 1, date, 7);
+ if (err < 0) {
+ dev_err(dev, "Unable to read date\n");
+ return -EIO;
+ }
+
+ dev_dbg(dev,
+ "%s: raw data is sec=%02x, min=%02x, hr=%02x, wday=%02x, mday=%02x, mon=%02x, year=%02x\n",
+ __func__,
+ date[0], date[1], date[2], date[3], date[4], date[5], date[6]);
+
+ tm->tm_sec = bcd2bin(date[RX4035_REG_SC] & 0x7F);
+ tm->tm_min = bcd2bin(date[RX4035_REG_MN] & 0x7F);
+ tm->tm_hour = bcd2bin(date[RX4035_REG_HR] & 0x3F); /* rtc hr 0-23 */
+ tm->tm_wday = date[RX4035_REG_DW] & 0x7F;
+ tm->tm_mday = bcd2bin(date[RX4035_REG_DM] & 0x3F);
+ tm->tm_mon = bcd2bin(date[RX4035_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */
+ tm->tm_year = bcd2bin(date[RX4035_REG_YR]);
+ if (tm->tm_year < 70)
+ tm->tm_year += 100; /* assume we are in 1970...2069 */
+
+ dev_dbg(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);
+
+ err = rtc_valid_tm(tm);
+ if (err < 0)
+ dev_err(dev, "retrieved date/time is not valid.\n");
+
+ return err;
+}
+
+static int rx4035_set_datetime(struct device *dev, struct rtc_time *tm)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ int err;
+ unsigned char buf[8], *data;
+
+ data = buf;
+
+ /*
+ * Clear power-on / low voltage flags
+ * We aren't concerned if this is the first power up or if data
+ * is unreliable in date setting operations - clear flags
+ */
+ err = rx4035_get_reg(spi, RX4035_REG_CTL1, data);
+ if (err != 0) {
+ dev_err(dev, "Unable to read control register\n");
+ return -EIO;
+ }
+
+ *data &= ~(RX4035_FLAG_PON|RX4035_FLAG_VDET);
+
+ err = rx4035_set_reg(spi, RX4035_REG_CTL1, *data);
+ if (err != 0) {
+ dev_err(dev, "Unable to load control register\n");
+ return -EIO;
+ }
+
+ dev_dbg(dev, "%s: 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);
+
+ /*Set write xfer format address 0 and offset*/
+ *data++ = 0x00;
+
+ /* minutes and seconds */
+ data[RX4035_REG_SC] = bin2bcd(tm->tm_sec);
+ data[RX4035_REG_MN] = bin2bcd(tm->tm_min);
+
+ /*hours, indicating 24 hour mode*/
+ data[RX4035_REG_HR] = bin2bcd(tm->tm_hour) | 0x80;
+
+ data[RX4035_REG_DM] = bin2bcd(tm->tm_mday);
+
+ /* month, 1 - 12 */
+ data[RX4035_REG_MO] = bin2bcd(tm->tm_mon + 1);
+
+ /* year and century */
+ data[RX4035_REG_YR] = bin2bcd(tm->tm_year % 100);
+
+ /* day of week */
+ data[RX4035_REG_DW] = tm->tm_wday;
+
+ /* write time data */
+ err = spi_write_then_read(spi, buf, 8, NULL, 0);
+ if (err != 0) {
+ dev_err(dev, "Unable to write to date registers\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static const struct rtc_class_ops rx4035_rtc_ops = {
+ .read_time = rx4035_get_datetime,
+ .set_time = rx4035_set_datetime,
+};
+
+static int rx4035_probe(struct spi_device *spi)
+{
+ struct rtc_device *rtc;
+ unsigned char tmp;
+ int res;
+
+ res = rx4035_get_reg(spi, RX4035_REG_SC, &tmp);
+ if (res != 0)
+ return res;
+
+ rtc = devm_rtc_device_register(&spi->dev, "rx4035",
+ &rx4035_rtc_ops, THIS_MODULE);
+ if (IS_ERR(rtc))
+ return PTR_ERR(rtc);
+
+ spi_set_drvdata(spi, rtc);
+ return 0;
+}
+
+static const struct spi_device_id rx4035_id[] = {
+ { "rx4035", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(spi, rx4035_id);
+
+static struct spi_driver rx4035_driver = {
+ .driver = {
+ .name = "rtc-rx4035",
+ },
+ .probe = rx4035_probe,
+ .id_table = rx4035_id,
+};
+
+module_spi_driver(rx4035_driver);
+
+MODULE_DESCRIPTION("rx4035 spi RTC driver");
+MODULE_AUTHOR("Ryan Jones");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("spi:rtc-rx4035");
Add support for spi rtc rx4035. The driver is based off of rtc-rx4581 but accounts for some discrepancies in device register map/ data transfer format. Signed-off-by: Ryan Jones <ryan@rjones.io> --- drivers/rtc/Kconfig | 8 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-rx4035.c | 222 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 231 insertions(+) create mode 100644 drivers/rtc/rtc-rx4035.c