v4.19.13 snapshot.
diff --git a/drivers/rtc/rtc-rv3029c2.c b/drivers/rtc/rtc-rv3029c2.c
new file mode 100644
index 0000000..3d6174e
--- /dev/null
+++ b/drivers/rtc/rtc-rv3029c2.c
@@ -0,0 +1,1001 @@
+/*
+ * Micro Crystal RV-3029 / RV-3049 rtc class driver
+ *
+ * Author: Gregory Hermant <gregory.hermant@calao-systems.com>
+ * Michael Buesch <m@bues.ch>
+ *
+ * based on previously existing rtc class drivers
+ *
+ * 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/i2c.h>
+#include <linux/spi/spi.h>
+#include <linux/bcd.h>
+#include <linux/rtc.h>
+#include <linux/delay.h>
+#include <linux/of.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/regmap.h>
+
+/* Register map */
+/* control section */
+#define RV3029_ONOFF_CTRL 0x00
+#define RV3029_ONOFF_CTRL_WE BIT(0)
+#define RV3029_ONOFF_CTRL_TE BIT(1)
+#define RV3029_ONOFF_CTRL_TAR BIT(2)
+#define RV3029_ONOFF_CTRL_EERE BIT(3)
+#define RV3029_ONOFF_CTRL_SRON BIT(4)
+#define RV3029_ONOFF_CTRL_TD0 BIT(5)
+#define RV3029_ONOFF_CTRL_TD1 BIT(6)
+#define RV3029_ONOFF_CTRL_CLKINT BIT(7)
+#define RV3029_IRQ_CTRL 0x01
+#define RV3029_IRQ_CTRL_AIE BIT(0)
+#define RV3029_IRQ_CTRL_TIE BIT(1)
+#define RV3029_IRQ_CTRL_V1IE BIT(2)
+#define RV3029_IRQ_CTRL_V2IE BIT(3)
+#define RV3029_IRQ_CTRL_SRIE BIT(4)
+#define RV3029_IRQ_FLAGS 0x02
+#define RV3029_IRQ_FLAGS_AF BIT(0)
+#define RV3029_IRQ_FLAGS_TF BIT(1)
+#define RV3029_IRQ_FLAGS_V1IF BIT(2)
+#define RV3029_IRQ_FLAGS_V2IF BIT(3)
+#define RV3029_IRQ_FLAGS_SRF BIT(4)
+#define RV3029_STATUS 0x03
+#define RV3029_STATUS_VLOW1 BIT(2)
+#define RV3029_STATUS_VLOW2 BIT(3)
+#define RV3029_STATUS_SR BIT(4)
+#define RV3029_STATUS_PON BIT(5)
+#define RV3029_STATUS_EEBUSY BIT(7)
+#define RV3029_RST_CTRL 0x04
+#define RV3029_RST_CTRL_SYSR BIT(4)
+#define RV3029_CONTROL_SECTION_LEN 0x05
+
+/* watch section */
+#define RV3029_W_SEC 0x08
+#define RV3029_W_MINUTES 0x09
+#define RV3029_W_HOURS 0x0A
+#define RV3029_REG_HR_12_24 BIT(6) /* 24h/12h mode */
+#define RV3029_REG_HR_PM BIT(5) /* PM/AM bit in 12h mode */
+#define RV3029_W_DATE 0x0B
+#define RV3029_W_DAYS 0x0C
+#define RV3029_W_MONTHS 0x0D
+#define RV3029_W_YEARS 0x0E
+#define RV3029_WATCH_SECTION_LEN 0x07
+
+/* alarm section */
+#define RV3029_A_SC 0x10
+#define RV3029_A_MN 0x11
+#define RV3029_A_HR 0x12
+#define RV3029_A_DT 0x13
+#define RV3029_A_DW 0x14
+#define RV3029_A_MO 0x15
+#define RV3029_A_YR 0x16
+#define RV3029_A_AE_X BIT(7)
+#define RV3029_ALARM_SECTION_LEN 0x07
+
+/* timer section */
+#define RV3029_TIMER_LOW 0x18
+#define RV3029_TIMER_HIGH 0x19
+
+/* temperature section */
+#define RV3029_TEMP_PAGE 0x20
+
+/* eeprom data section */
+#define RV3029_E2P_EEDATA1 0x28
+#define RV3029_E2P_EEDATA2 0x29
+#define RV3029_E2PDATA_SECTION_LEN 0x02
+
+/* eeprom control section */
+#define RV3029_CONTROL_E2P_EECTRL 0x30
+#define RV3029_EECTRL_THP BIT(0) /* temp scan interval */
+#define RV3029_EECTRL_THE BIT(1) /* thermometer enable */
+#define RV3029_EECTRL_FD0 BIT(2) /* CLKOUT */
+#define RV3029_EECTRL_FD1 BIT(3) /* CLKOUT */
+#define RV3029_TRICKLE_1K BIT(4) /* 1.5K resistance */
+#define RV3029_TRICKLE_5K BIT(5) /* 5K resistance */
+#define RV3029_TRICKLE_20K BIT(6) /* 20K resistance */
+#define RV3029_TRICKLE_80K BIT(7) /* 80K resistance */
+#define RV3029_TRICKLE_MASK (RV3029_TRICKLE_1K |\
+ RV3029_TRICKLE_5K |\
+ RV3029_TRICKLE_20K |\
+ RV3029_TRICKLE_80K)
+#define RV3029_TRICKLE_SHIFT 4
+#define RV3029_CONTROL_E2P_XOFFS 0x31 /* XTAL offset */
+#define RV3029_CONTROL_E2P_XOFFS_SIGN BIT(7) /* Sign: 1->pos, 0->neg */
+#define RV3029_CONTROL_E2P_QCOEF 0x32 /* XTAL temp drift coef */
+#define RV3029_CONTROL_E2P_TURNOVER 0x33 /* XTAL turnover temp (in *C) */
+#define RV3029_CONTROL_E2P_TOV_MASK 0x3F /* XTAL turnover temp mask */
+
+/* user ram section */
+#define RV3029_USR1_RAM_PAGE 0x38
+#define RV3029_USR1_SECTION_LEN 0x04
+#define RV3029_USR2_RAM_PAGE 0x3C
+#define RV3029_USR2_SECTION_LEN 0x04
+
+struct rv3029_data {
+ struct device *dev;
+ struct rtc_device *rtc;
+ struct regmap *regmap;
+ int irq;
+};
+
+static int rv3029_read_regs(struct device *dev, u8 reg, u8 *buf,
+ unsigned int len)
+{
+ struct rv3029_data *rv3029 = dev_get_drvdata(dev);
+
+ if ((reg > RV3029_USR1_RAM_PAGE + 7) ||
+ (reg + len > RV3029_USR1_RAM_PAGE + 8))
+ return -EINVAL;
+
+ return regmap_bulk_read(rv3029->regmap, reg, buf, len);
+}
+
+static int rv3029_write_regs(struct device *dev, u8 reg, u8 const buf[],
+ unsigned int len)
+{
+ struct rv3029_data *rv3029 = dev_get_drvdata(dev);
+
+ if ((reg > RV3029_USR1_RAM_PAGE + 7) ||
+ (reg + len > RV3029_USR1_RAM_PAGE + 8))
+ return -EINVAL;
+
+ return regmap_bulk_write(rv3029->regmap, reg, buf, len);
+}
+
+static int rv3029_update_bits(struct device *dev, u8 reg, u8 mask, u8 set)
+{
+ u8 buf;
+ int ret;
+
+ ret = rv3029_read_regs(dev, reg, &buf, 1);
+ if (ret < 0)
+ return ret;
+ buf &= ~mask;
+ buf |= set & mask;
+ ret = rv3029_write_regs(dev, reg, &buf, 1);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int rv3029_get_sr(struct device *dev, u8 *buf)
+{
+ int ret = rv3029_read_regs(dev, RV3029_STATUS, buf, 1);
+
+ if (ret < 0)
+ return -EIO;
+ dev_dbg(dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]);
+ return 0;
+}
+
+static int rv3029_set_sr(struct device *dev, u8 val)
+{
+ u8 buf[1];
+ int sr;
+
+ buf[0] = val;
+ sr = rv3029_write_regs(dev, RV3029_STATUS, buf, 1);
+ dev_dbg(dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]);
+ if (sr < 0)
+ return -EIO;
+ return 0;
+}
+
+static int rv3029_eeprom_busywait(struct device *dev)
+{
+ int i, ret;
+ u8 sr;
+
+ for (i = 100; i > 0; i--) {
+ ret = rv3029_get_sr(dev, &sr);
+ if (ret < 0)
+ break;
+ if (!(sr & RV3029_STATUS_EEBUSY))
+ break;
+ usleep_range(1000, 10000);
+ }
+ if (i <= 0) {
+ dev_err(dev, "EEPROM busy wait timeout.\n");
+ return -ETIMEDOUT;
+ }
+
+ return ret;
+}
+
+static int rv3029_eeprom_exit(struct device *dev)
+{
+ /* Re-enable eeprom refresh */
+ return rv3029_update_bits(dev, RV3029_ONOFF_CTRL,
+ RV3029_ONOFF_CTRL_EERE,
+ RV3029_ONOFF_CTRL_EERE);
+}
+
+static int rv3029_eeprom_enter(struct device *dev)
+{
+ int ret;
+ u8 sr;
+
+ /* Check whether we are in the allowed voltage range. */
+ ret = rv3029_get_sr(dev, &sr);
+ if (ret < 0)
+ return ret;
+ if (sr & (RV3029_STATUS_VLOW1 | RV3029_STATUS_VLOW2)) {
+ /* We clear the bits and retry once just in case
+ * we had a brown out in early startup.
+ */
+ sr &= ~RV3029_STATUS_VLOW1;
+ sr &= ~RV3029_STATUS_VLOW2;
+ ret = rv3029_set_sr(dev, sr);
+ if (ret < 0)
+ return ret;
+ usleep_range(1000, 10000);
+ ret = rv3029_get_sr(dev, &sr);
+ if (ret < 0)
+ return ret;
+ if (sr & (RV3029_STATUS_VLOW1 | RV3029_STATUS_VLOW2)) {
+ dev_err(dev,
+ "Supply voltage is too low to safely access the EEPROM.\n");
+ return -ENODEV;
+ }
+ }
+
+ /* Disable eeprom refresh. */
+ ret = rv3029_update_bits(dev, RV3029_ONOFF_CTRL, RV3029_ONOFF_CTRL_EERE,
+ 0);
+ if (ret < 0)
+ return ret;
+
+ /* Wait for any previous eeprom accesses to finish. */
+ ret = rv3029_eeprom_busywait(dev);
+ if (ret < 0)
+ rv3029_eeprom_exit(dev);
+
+ return ret;
+}
+
+static int rv3029_eeprom_read(struct device *dev, u8 reg,
+ u8 buf[], size_t len)
+{
+ int ret, err;
+
+ err = rv3029_eeprom_enter(dev);
+ if (err < 0)
+ return err;
+
+ ret = rv3029_read_regs(dev, reg, buf, len);
+
+ err = rv3029_eeprom_exit(dev);
+ if (err < 0)
+ return err;
+
+ return ret;
+}
+
+static int rv3029_eeprom_write(struct device *dev, u8 reg,
+ u8 const buf[], size_t len)
+{
+ int ret;
+ size_t i;
+ u8 tmp;
+
+ ret = rv3029_eeprom_enter(dev);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < len; i++, reg++) {
+ ret = rv3029_read_regs(dev, reg, &tmp, 1);
+ if (ret < 0)
+ break;
+ if (tmp != buf[i]) {
+ ret = rv3029_write_regs(dev, reg, &buf[i], 1);
+ if (ret < 0)
+ break;
+ }
+ ret = rv3029_eeprom_busywait(dev);
+ if (ret < 0)
+ break;
+ }
+
+ ret = rv3029_eeprom_exit(dev);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int rv3029_eeprom_update_bits(struct device *dev,
+ u8 reg, u8 mask, u8 set)
+{
+ u8 buf;
+ int ret;
+
+ ret = rv3029_eeprom_read(dev, reg, &buf, 1);
+ if (ret < 0)
+ return ret;
+ buf &= ~mask;
+ buf |= set & mask;
+ ret = rv3029_eeprom_write(dev, reg, &buf, 1);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static irqreturn_t rv3029_handle_irq(int irq, void *dev_id)
+{
+ struct device *dev = dev_id;
+ struct rv3029_data *rv3029 = dev_get_drvdata(dev);
+ struct mutex *lock = &rv3029->rtc->ops_lock;
+ unsigned long events = 0;
+ u8 flags, controls;
+ int ret;
+
+ mutex_lock(lock);
+
+ ret = rv3029_read_regs(dev, RV3029_IRQ_CTRL, &controls, 1);
+ if (ret) {
+ dev_warn(dev, "Read IRQ Control Register error %d\n", ret);
+ mutex_unlock(lock);
+ return IRQ_NONE;
+ }
+
+ ret = rv3029_read_regs(dev, RV3029_IRQ_FLAGS, &flags, 1);
+ if (ret) {
+ dev_warn(dev, "Read IRQ Flags Register error %d\n", ret);
+ mutex_unlock(lock);
+ return IRQ_NONE;
+ }
+
+ if (flags & RV3029_IRQ_FLAGS_AF) {
+ flags &= ~RV3029_IRQ_FLAGS_AF;
+ controls &= ~RV3029_IRQ_CTRL_AIE;
+ events |= RTC_AF;
+ }
+
+ if (events) {
+ rtc_update_irq(rv3029->rtc, 1, events);
+ rv3029_write_regs(dev, RV3029_IRQ_FLAGS, &flags, 1);
+ rv3029_write_regs(dev, RV3029_IRQ_CTRL, &controls, 1);
+ }
+ mutex_unlock(lock);
+
+ return IRQ_HANDLED;
+}
+
+static int rv3029_read_time(struct device *dev, struct rtc_time *tm)
+{
+ u8 buf[1];
+ int ret;
+ u8 regs[RV3029_WATCH_SECTION_LEN] = { 0, };
+
+ ret = rv3029_get_sr(dev, buf);
+ if (ret < 0) {
+ dev_err(dev, "%s: reading SR failed\n", __func__);
+ return -EIO;
+ }
+
+ ret = rv3029_read_regs(dev, RV3029_W_SEC, regs,
+ RV3029_WATCH_SECTION_LEN);
+ if (ret < 0) {
+ dev_err(dev, "%s: reading RTC section failed\n", __func__);
+ return ret;
+ }
+
+ tm->tm_sec = bcd2bin(regs[RV3029_W_SEC - RV3029_W_SEC]);
+ tm->tm_min = bcd2bin(regs[RV3029_W_MINUTES - RV3029_W_SEC]);
+
+ /* HR field has a more complex interpretation */
+ {
+ const u8 _hr = regs[RV3029_W_HOURS - RV3029_W_SEC];
+
+ if (_hr & RV3029_REG_HR_12_24) {
+ /* 12h format */
+ tm->tm_hour = bcd2bin(_hr & 0x1f);
+ if (_hr & RV3029_REG_HR_PM) /* PM flag set */
+ tm->tm_hour += 12;
+ } else /* 24h format */
+ tm->tm_hour = bcd2bin(_hr & 0x3f);
+ }
+
+ tm->tm_mday = bcd2bin(regs[RV3029_W_DATE - RV3029_W_SEC]);
+ tm->tm_mon = bcd2bin(regs[RV3029_W_MONTHS - RV3029_W_SEC]) - 1;
+ tm->tm_year = bcd2bin(regs[RV3029_W_YEARS - RV3029_W_SEC]) + 100;
+ tm->tm_wday = bcd2bin(regs[RV3029_W_DAYS - RV3029_W_SEC]) - 1;
+
+ return 0;
+}
+
+static int rv3029_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
+{
+ struct rtc_time *const tm = &alarm->time;
+ int ret;
+ u8 regs[8], controls, flags;
+
+ ret = rv3029_get_sr(dev, regs);
+ if (ret < 0) {
+ dev_err(dev, "%s: reading SR failed\n", __func__);
+ return -EIO;
+ }
+
+ ret = rv3029_read_regs(dev, RV3029_A_SC, regs,
+ RV3029_ALARM_SECTION_LEN);
+
+ if (ret < 0) {
+ dev_err(dev, "%s: reading alarm section failed\n", __func__);
+ return ret;
+ }
+
+ ret = rv3029_read_regs(dev, RV3029_IRQ_CTRL, &controls, 1);
+ if (ret) {
+ dev_err(dev, "Read IRQ Control Register error %d\n", ret);
+ return ret;
+ }
+ ret = rv3029_read_regs(dev, RV3029_IRQ_FLAGS, &flags, 1);
+ if (ret < 0) {
+ dev_err(dev, "Read IRQ Flags Register error %d\n", ret);
+ return ret;
+ }
+
+ tm->tm_sec = bcd2bin(regs[RV3029_A_SC - RV3029_A_SC] & 0x7f);
+ tm->tm_min = bcd2bin(regs[RV3029_A_MN - RV3029_A_SC] & 0x7f);
+ tm->tm_hour = bcd2bin(regs[RV3029_A_HR - RV3029_A_SC] & 0x3f);
+ tm->tm_mday = bcd2bin(regs[RV3029_A_DT - RV3029_A_SC] & 0x3f);
+ tm->tm_mon = bcd2bin(regs[RV3029_A_MO - RV3029_A_SC] & 0x1f) - 1;
+ tm->tm_year = bcd2bin(regs[RV3029_A_YR - RV3029_A_SC] & 0x7f) + 100;
+ tm->tm_wday = bcd2bin(regs[RV3029_A_DW - RV3029_A_SC] & 0x07) - 1;
+
+ alarm->enabled = !!(controls & RV3029_IRQ_CTRL_AIE);
+ alarm->pending = (flags & RV3029_IRQ_FLAGS_AF) && alarm->enabled;
+
+ return 0;
+}
+
+static int rv3029_alarm_irq_enable(struct device *dev, unsigned int enable)
+{
+ int ret;
+ u8 controls;
+
+ ret = rv3029_read_regs(dev, RV3029_IRQ_CTRL, &controls, 1);
+ if (ret < 0) {
+ dev_warn(dev, "Read IRQ Control Register error %d\n", ret);
+ return ret;
+ }
+
+ /* enable/disable AIE irq */
+ if (enable)
+ controls |= RV3029_IRQ_CTRL_AIE;
+ else
+ controls &= ~RV3029_IRQ_CTRL_AIE;
+
+ ret = rv3029_write_regs(dev, RV3029_IRQ_CTRL, &controls, 1);
+ if (ret < 0) {
+ dev_err(dev, "can't update INT reg\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int rv3029_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
+{
+ struct rtc_time *const tm = &alarm->time;
+ int ret;
+ u8 regs[8];
+
+ /*
+ * The clock has an 8 bit wide bcd-coded register (they never learn)
+ * for the year. tm_year is an offset from 1900 and we are interested
+ * in the 2000-2099 range, so any value less than 100 is invalid.
+ */
+ if (tm->tm_year < 100)
+ return -EINVAL;
+
+ ret = rv3029_get_sr(dev, regs);
+ if (ret < 0) {
+ dev_err(dev, "%s: reading SR failed\n", __func__);
+ return -EIO;
+ }
+
+ /* Activate all the alarms with AE_x bit */
+ regs[RV3029_A_SC - RV3029_A_SC] = bin2bcd(tm->tm_sec) | RV3029_A_AE_X;
+ regs[RV3029_A_MN - RV3029_A_SC] = bin2bcd(tm->tm_min) | RV3029_A_AE_X;
+ regs[RV3029_A_HR - RV3029_A_SC] = (bin2bcd(tm->tm_hour) & 0x3f)
+ | RV3029_A_AE_X;
+ regs[RV3029_A_DT - RV3029_A_SC] = (bin2bcd(tm->tm_mday) & 0x3f)
+ | RV3029_A_AE_X;
+ regs[RV3029_A_MO - RV3029_A_SC] = (bin2bcd(tm->tm_mon + 1) & 0x1f)
+ | RV3029_A_AE_X;
+ regs[RV3029_A_DW - RV3029_A_SC] = (bin2bcd(tm->tm_wday + 1) & 0x7)
+ | RV3029_A_AE_X;
+ regs[RV3029_A_YR - RV3029_A_SC] = (bin2bcd(tm->tm_year - 100))
+ | RV3029_A_AE_X;
+
+ /* Write the alarm */
+ ret = rv3029_write_regs(dev, RV3029_A_SC, regs,
+ RV3029_ALARM_SECTION_LEN);
+ if (ret < 0)
+ return ret;
+
+ if (alarm->enabled) {
+ /* enable AIE irq */
+ ret = rv3029_alarm_irq_enable(dev, 1);
+ if (ret)
+ return ret;
+ } else {
+ /* disable AIE irq */
+ ret = rv3029_alarm_irq_enable(dev, 0);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int rv3029_set_time(struct device *dev, struct rtc_time *tm)
+{
+ u8 regs[8];
+ int ret;
+
+ /*
+ * The clock has an 8 bit wide bcd-coded register (they never learn)
+ * for the year. tm_year is an offset from 1900 and we are interested
+ * in the 2000-2099 range, so any value less than 100 is invalid.
+ */
+ if (tm->tm_year < 100)
+ return -EINVAL;
+
+ regs[RV3029_W_SEC - RV3029_W_SEC] = bin2bcd(tm->tm_sec);
+ regs[RV3029_W_MINUTES - RV3029_W_SEC] = bin2bcd(tm->tm_min);
+ regs[RV3029_W_HOURS - RV3029_W_SEC] = bin2bcd(tm->tm_hour);
+ regs[RV3029_W_DATE - RV3029_W_SEC] = bin2bcd(tm->tm_mday);
+ regs[RV3029_W_MONTHS - RV3029_W_SEC] = bin2bcd(tm->tm_mon + 1);
+ regs[RV3029_W_DAYS - RV3029_W_SEC] = bin2bcd(tm->tm_wday + 1) & 0x7;
+ regs[RV3029_W_YEARS - RV3029_W_SEC] = bin2bcd(tm->tm_year - 100);
+
+ ret = rv3029_write_regs(dev, RV3029_W_SEC, regs,
+ RV3029_WATCH_SECTION_LEN);
+ if (ret < 0)
+ return ret;
+
+ ret = rv3029_get_sr(dev, regs);
+ if (ret < 0) {
+ dev_err(dev, "%s: reading SR failed\n", __func__);
+ return ret;
+ }
+ /* clear PON bit */
+ ret = rv3029_set_sr(dev, (regs[0] & ~RV3029_STATUS_PON));
+ if (ret < 0) {
+ dev_err(dev, "%s: reading SR failed\n", __func__);
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct rv3029_trickle_tab_elem {
+ u32 r; /* resistance in ohms */
+ u8 conf; /* trickle config bits */
+} rv3029_trickle_tab[] = {
+ {
+ .r = 1076,
+ .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
+ RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
+ }, {
+ .r = 1091,
+ .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
+ RV3029_TRICKLE_20K,
+ }, {
+ .r = 1137,
+ .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
+ RV3029_TRICKLE_80K,
+ }, {
+ .r = 1154,
+ .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K,
+ }, {
+ .r = 1371,
+ .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K |
+ RV3029_TRICKLE_80K,
+ }, {
+ .r = 1395,
+ .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K,
+ }, {
+ .r = 1472,
+ .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_80K,
+ }, {
+ .r = 1500,
+ .conf = RV3029_TRICKLE_1K,
+ }, {
+ .r = 3810,
+ .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K |
+ RV3029_TRICKLE_80K,
+ }, {
+ .r = 4000,
+ .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K,
+ }, {
+ .r = 4706,
+ .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_80K,
+ }, {
+ .r = 5000,
+ .conf = RV3029_TRICKLE_5K,
+ }, {
+ .r = 16000,
+ .conf = RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
+ }, {
+ .r = 20000,
+ .conf = RV3029_TRICKLE_20K,
+ }, {
+ .r = 80000,
+ .conf = RV3029_TRICKLE_80K,
+ },
+};
+
+static void rv3029_trickle_config(struct device *dev)
+{
+ struct device_node *of_node = dev->of_node;
+ const struct rv3029_trickle_tab_elem *elem;
+ int i, err;
+ u32 ohms;
+ u8 trickle_set_bits;
+
+ if (!of_node)
+ return;
+
+ /* Configure the trickle charger. */
+ err = of_property_read_u32(of_node, "trickle-resistor-ohms", &ohms);
+ if (err) {
+ /* Disable trickle charger. */
+ trickle_set_bits = 0;
+ } else {
+ /* Enable trickle charger. */
+ for (i = 0; i < ARRAY_SIZE(rv3029_trickle_tab); i++) {
+ elem = &rv3029_trickle_tab[i];
+ if (elem->r >= ohms)
+ break;
+ }
+ trickle_set_bits = elem->conf;
+ dev_info(dev,
+ "Trickle charger enabled at %d ohms resistance.\n",
+ elem->r);
+ }
+ err = rv3029_eeprom_update_bits(dev, RV3029_CONTROL_E2P_EECTRL,
+ RV3029_TRICKLE_MASK,
+ trickle_set_bits);
+ if (err < 0)
+ dev_err(dev, "Failed to update trickle charger config\n");
+}
+
+#ifdef CONFIG_RTC_DRV_RV3029_HWMON
+
+static int rv3029_read_temp(struct device *dev, int *temp_mC)
+{
+ int ret;
+ u8 temp;
+
+ ret = rv3029_read_regs(dev, RV3029_TEMP_PAGE, &temp, 1);
+ if (ret < 0)
+ return ret;
+
+ *temp_mC = ((int)temp - 60) * 1000;
+
+ return 0;
+}
+
+static ssize_t rv3029_hwmon_show_temp(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int ret, temp_mC;
+
+ ret = rv3029_read_temp(dev, &temp_mC);
+ if (ret < 0)
+ return ret;
+
+ return sprintf(buf, "%d\n", temp_mC);
+}
+
+static ssize_t rv3029_hwmon_set_update_interval(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ unsigned long interval_ms;
+ int ret;
+ u8 th_set_bits = 0;
+
+ ret = kstrtoul(buf, 10, &interval_ms);
+ if (ret < 0)
+ return ret;
+
+ if (interval_ms != 0) {
+ th_set_bits |= RV3029_EECTRL_THE;
+ if (interval_ms >= 16000)
+ th_set_bits |= RV3029_EECTRL_THP;
+ }
+ ret = rv3029_eeprom_update_bits(dev, RV3029_CONTROL_E2P_EECTRL,
+ RV3029_EECTRL_THE | RV3029_EECTRL_THP,
+ th_set_bits);
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+static ssize_t rv3029_hwmon_show_update_interval(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int ret, interval_ms;
+ u8 eectrl;
+
+ ret = rv3029_eeprom_read(dev, RV3029_CONTROL_E2P_EECTRL,
+ &eectrl, 1);
+ if (ret < 0)
+ return ret;
+
+ if (eectrl & RV3029_EECTRL_THE) {
+ if (eectrl & RV3029_EECTRL_THP)
+ interval_ms = 16000;
+ else
+ interval_ms = 1000;
+ } else {
+ interval_ms = 0;
+ }
+
+ return sprintf(buf, "%d\n", interval_ms);
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, rv3029_hwmon_show_temp,
+ NULL, 0);
+static SENSOR_DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO,
+ rv3029_hwmon_show_update_interval,
+ rv3029_hwmon_set_update_interval, 0);
+
+static struct attribute *rv3029_hwmon_attrs[] = {
+ &sensor_dev_attr_temp1_input.dev_attr.attr,
+ &sensor_dev_attr_update_interval.dev_attr.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(rv3029_hwmon);
+
+static void rv3029_hwmon_register(struct device *dev, const char *name)
+{
+ struct rv3029_data *rv3029 = dev_get_drvdata(dev);
+ struct device *hwmon_dev;
+
+ hwmon_dev = devm_hwmon_device_register_with_groups(dev, name, rv3029,
+ rv3029_hwmon_groups);
+ if (IS_ERR(hwmon_dev)) {
+ dev_warn(dev, "unable to register hwmon device %ld\n",
+ PTR_ERR(hwmon_dev));
+ }
+}
+
+#else /* CONFIG_RTC_DRV_RV3029_HWMON */
+
+static void rv3029_hwmon_register(struct device *dev, const char *name)
+{
+}
+
+#endif /* CONFIG_RTC_DRV_RV3029_HWMON */
+
+static struct rtc_class_ops rv3029_rtc_ops = {
+ .read_time = rv3029_read_time,
+ .set_time = rv3029_set_time,
+};
+
+static int rv3029_probe(struct device *dev, struct regmap *regmap, int irq,
+ const char *name)
+{
+ struct rv3029_data *rv3029;
+ int rc = 0;
+ u8 buf[1];
+
+ rv3029 = devm_kzalloc(dev, sizeof(*rv3029), GFP_KERNEL);
+ if (!rv3029)
+ return -ENOMEM;
+
+ rv3029->regmap = regmap;
+ rv3029->irq = irq;
+ rv3029->dev = dev;
+ dev_set_drvdata(dev, rv3029);
+
+ rc = rv3029_get_sr(dev, buf);
+ if (rc < 0) {
+ dev_err(dev, "reading status failed\n");
+ return rc;
+ }
+
+ rv3029_trickle_config(dev);
+ rv3029_hwmon_register(dev, name);
+
+ rv3029->rtc = devm_rtc_device_register(dev, name, &rv3029_rtc_ops,
+ THIS_MODULE);
+ if (IS_ERR(rv3029->rtc)) {
+ dev_err(dev, "unable to register the class device\n");
+ return PTR_ERR(rv3029->rtc);
+ }
+
+ if (rv3029->irq > 0) {
+ rc = devm_request_threaded_irq(dev, rv3029->irq,
+ NULL, rv3029_handle_irq,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+ "rv3029", dev);
+ if (rc) {
+ dev_warn(dev, "unable to request IRQ, alarms disabled\n");
+ rv3029->irq = 0;
+ } else {
+ rv3029_rtc_ops.read_alarm = rv3029_read_alarm;
+ rv3029_rtc_ops.set_alarm = rv3029_set_alarm;
+ rv3029_rtc_ops.alarm_irq_enable = rv3029_alarm_irq_enable;
+ }
+ }
+
+ return 0;
+}
+
+#if IS_ENABLED(CONFIG_I2C)
+
+static int rv3029_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct regmap *regmap;
+ static const struct regmap_config config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ };
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK |
+ I2C_FUNC_SMBUS_BYTE)) {
+ dev_err(&client->dev, "Adapter does not support SMBUS_I2C_BLOCK or SMBUS_I2C_BYTE\n");
+ return -ENODEV;
+ }
+
+ regmap = devm_regmap_init_i2c(client, &config);
+ if (IS_ERR(regmap)) {
+ dev_err(&client->dev, "%s: regmap allocation failed: %ld\n",
+ __func__, PTR_ERR(regmap));
+ return PTR_ERR(regmap);
+ }
+
+ return rv3029_probe(&client->dev, regmap, client->irq, client->name);
+}
+
+static const struct i2c_device_id rv3029_id[] = {
+ { "rv3029", 0 },
+ { "rv3029c2", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, rv3029_id);
+
+static const struct of_device_id rv3029_of_match[] = {
+ { .compatible = "microcrystal,rv3029" },
+ /* Backward compatibility only, do not use compatibles below: */
+ { .compatible = "rv3029" },
+ { .compatible = "rv3029c2" },
+ { .compatible = "mc,rv3029c2" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, rv3029_of_match);
+
+static struct i2c_driver rv3029_driver = {
+ .driver = {
+ .name = "rtc-rv3029c2",
+ .of_match_table = of_match_ptr(rv3029_of_match),
+ },
+ .probe = rv3029_i2c_probe,
+ .id_table = rv3029_id,
+};
+
+static int rv3029_register_driver(void)
+{
+ return i2c_add_driver(&rv3029_driver);
+}
+
+static void rv3029_unregister_driver(void)
+{
+ i2c_del_driver(&rv3029_driver);
+}
+
+#else
+
+static int rv3029_register_driver(void)
+{
+ return 0;
+}
+
+static void rv3029_unregister_driver(void)
+{
+}
+
+#endif
+
+#if IS_ENABLED(CONFIG_SPI_MASTER)
+
+static int rv3049_probe(struct spi_device *spi)
+{
+ static const struct regmap_config config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ };
+ struct regmap *regmap;
+
+ regmap = devm_regmap_init_spi(spi, &config);
+ if (IS_ERR(regmap)) {
+ dev_err(&spi->dev, "%s: regmap allocation failed: %ld\n",
+ __func__, PTR_ERR(regmap));
+ return PTR_ERR(regmap);
+ }
+
+ return rv3029_probe(&spi->dev, regmap, spi->irq, "rv3049");
+}
+
+static struct spi_driver rv3049_driver = {
+ .driver = {
+ .name = "rv3049",
+ },
+ .probe = rv3049_probe,
+};
+
+static int rv3049_register_driver(void)
+{
+ return spi_register_driver(&rv3049_driver);
+}
+
+static void rv3049_unregister_driver(void)
+{
+ spi_unregister_driver(&rv3049_driver);
+}
+
+#else
+
+static int rv3049_register_driver(void)
+{
+ return 0;
+}
+
+static void rv3049_unregister_driver(void)
+{
+}
+
+#endif
+
+static int __init rv30x9_init(void)
+{
+ int ret;
+
+ ret = rv3029_register_driver();
+ if (ret) {
+ pr_err("Failed to register rv3029 driver: %d\n", ret);
+ return ret;
+ }
+
+ ret = rv3049_register_driver();
+ if (ret) {
+ pr_err("Failed to register rv3049 driver: %d\n", ret);
+ rv3029_unregister_driver();
+ }
+
+ return ret;
+}
+module_init(rv30x9_init)
+
+static void __exit rv30x9_exit(void)
+{
+ rv3049_unregister_driver();
+ rv3029_unregister_driver();
+}
+module_exit(rv30x9_exit)
+
+MODULE_AUTHOR("Gregory Hermant <gregory.hermant@calao-systems.com>");
+MODULE_AUTHOR("Michael Buesch <m@bues.ch>");
+MODULE_DESCRIPTION("Micro Crystal RV3029/RV3049 RTC driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("spi:rv3049");