diff options
Diffstat (limited to 'drivers/rtc/rtc-rv3029c2.c')
| -rw-r--r-- | drivers/rtc/rtc-rv3029c2.c | 924 |
1 files changed, 924 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-rv3029c2.c b/drivers/rtc/rtc-rv3029c2.c new file mode 100644 index 000000000..4a81feeb0 --- /dev/null +++ b/drivers/rtc/rtc-rv3029c2.c @@ -0,0 +1,924 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * 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 + */ + +#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/kstrtox.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_RAM_PAGE 0x38 +#define RV3029_RAM_SECTION_LEN 8 + +struct rv3029_data { + struct device *dev; + struct rtc_device *rtc; + struct regmap *regmap; + int irq; +}; + +static int rv3029_eeprom_busywait(struct rv3029_data *rv3029) +{ + unsigned int sr; + int i, ret; + + for (i = 100; i > 0; i--) { + ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr); + if (ret < 0) + break; + if (!(sr & RV3029_STATUS_EEBUSY)) + break; + usleep_range(1000, 10000); + } + if (i <= 0) { + dev_err(rv3029->dev, "EEPROM busy wait timeout.\n"); + return -ETIMEDOUT; + } + + return ret; +} + +static int rv3029_eeprom_exit(struct rv3029_data *rv3029) +{ + /* Re-enable eeprom refresh */ + return regmap_update_bits(rv3029->regmap, RV3029_ONOFF_CTRL, + RV3029_ONOFF_CTRL_EERE, + RV3029_ONOFF_CTRL_EERE); +} + +static int rv3029_eeprom_enter(struct rv3029_data *rv3029) +{ + unsigned int sr; + int ret; + + /* Check whether we are in the allowed voltage range. */ + ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr); + if (ret < 0) + return ret; + if (sr & RV3029_STATUS_VLOW2) + return -ENODEV; + if (sr & RV3029_STATUS_VLOW1) { + /* We clear the bits and retry once just in case + * we had a brown out in early startup. + */ + ret = regmap_update_bits(rv3029->regmap, RV3029_STATUS, + RV3029_STATUS_VLOW1, 0); + if (ret < 0) + return ret; + usleep_range(1000, 10000); + ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr); + if (ret < 0) + return ret; + if (sr & RV3029_STATUS_VLOW1) { + dev_err(rv3029->dev, + "Supply voltage is too low to safely access the EEPROM.\n"); + return -ENODEV; + } + } + + /* Disable eeprom refresh. */ + ret = regmap_update_bits(rv3029->regmap, 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(rv3029); + if (ret < 0) + rv3029_eeprom_exit(rv3029); + + return ret; +} + +static int rv3029_eeprom_read(struct rv3029_data *rv3029, u8 reg, + u8 buf[], size_t len) +{ + int ret, err; + + err = rv3029_eeprom_enter(rv3029); + if (err < 0) + return err; + + ret = regmap_bulk_read(rv3029->regmap, reg, buf, len); + + err = rv3029_eeprom_exit(rv3029); + if (err < 0) + return err; + + return ret; +} + +static int rv3029_eeprom_write(struct rv3029_data *rv3029, u8 reg, + u8 const buf[], size_t len) +{ + unsigned int tmp; + int ret, err; + size_t i; + + err = rv3029_eeprom_enter(rv3029); + if (err < 0) + return err; + + for (i = 0; i < len; i++, reg++) { + ret = regmap_read(rv3029->regmap, reg, &tmp); + if (ret < 0) + break; + if (tmp != buf[i]) { + tmp = buf[i]; + ret = regmap_write(rv3029->regmap, reg, tmp); + if (ret < 0) + break; + } + ret = rv3029_eeprom_busywait(rv3029); + if (ret < 0) + break; + } + + err = rv3029_eeprom_exit(rv3029); + if (err < 0) + return err; + + return ret; +} + +static int rv3029_eeprom_update_bits(struct rv3029_data *rv3029, + u8 reg, u8 mask, u8 set) +{ + u8 buf; + int ret; + + ret = rv3029_eeprom_read(rv3029, reg, &buf, 1); + if (ret < 0) + return ret; + buf &= ~mask; + buf |= set & mask; + ret = rv3029_eeprom_write(rv3029, 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); + unsigned int flags, controls; + unsigned long events = 0; + int ret; + + rtc_lock(rv3029->rtc); + + ret = regmap_read(rv3029->regmap, RV3029_IRQ_CTRL, &controls); + if (ret) { + dev_warn(dev, "Read IRQ Control Register error %d\n", ret); + rtc_unlock(rv3029->rtc); + return IRQ_NONE; + } + + ret = regmap_read(rv3029->regmap, RV3029_IRQ_FLAGS, &flags); + if (ret) { + dev_warn(dev, "Read IRQ Flags Register error %d\n", ret); + rtc_unlock(rv3029->rtc); + 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); + regmap_write(rv3029->regmap, RV3029_IRQ_FLAGS, flags); + regmap_write(rv3029->regmap, RV3029_IRQ_CTRL, controls); + } + rtc_unlock(rv3029->rtc); + + return IRQ_HANDLED; +} + +static int rv3029_read_time(struct device *dev, struct rtc_time *tm) +{ + struct rv3029_data *rv3029 = dev_get_drvdata(dev); + unsigned int sr; + int ret; + u8 regs[RV3029_WATCH_SECTION_LEN] = { 0, }; + + ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr); + if (ret < 0) + return ret; + + if (sr & (RV3029_STATUS_VLOW2 | RV3029_STATUS_PON)) + return -EINVAL; + + ret = regmap_bulk_read(rv3029->regmap, RV3029_W_SEC, regs, + RV3029_WATCH_SECTION_LEN); + if (ret < 0) + 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 rv3029_data *rv3029 = dev_get_drvdata(dev); + struct rtc_time *const tm = &alarm->time; + unsigned int controls, flags; + int ret; + u8 regs[8]; + + ret = regmap_bulk_read(rv3029->regmap, RV3029_A_SC, regs, + RV3029_ALARM_SECTION_LEN); + if (ret < 0) + return ret; + + ret = regmap_read(rv3029->regmap, RV3029_IRQ_CTRL, &controls); + if (ret) + return ret; + + ret = regmap_read(rv3029->regmap, RV3029_IRQ_FLAGS, &flags); + if (ret < 0) + 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) +{ + struct rv3029_data *rv3029 = dev_get_drvdata(dev); + + return regmap_update_bits(rv3029->regmap, RV3029_IRQ_CTRL, + RV3029_IRQ_CTRL_AIE, + enable ? RV3029_IRQ_CTRL_AIE : 0); +} + +static int rv3029_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) +{ + struct rv3029_data *rv3029 = dev_get_drvdata(dev); + struct rtc_time *const tm = &alarm->time; + int ret; + u8 regs[8]; + + /* 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 = regmap_bulk_write(rv3029->regmap, RV3029_A_SC, regs, + RV3029_ALARM_SECTION_LEN); + if (ret < 0) + return ret; + + return rv3029_alarm_irq_enable(dev, alarm->enabled); +} + +static int rv3029_set_time(struct device *dev, struct rtc_time *tm) +{ + struct rv3029_data *rv3029 = dev_get_drvdata(dev); + u8 regs[8]; + int ret; + + 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 = regmap_bulk_write(rv3029->regmap, RV3029_W_SEC, regs, + RV3029_WATCH_SECTION_LEN); + if (ret < 0) + return ret; + + /* clear PON and VLOW2 bits */ + return regmap_update_bits(rv3029->regmap, RV3029_STATUS, + RV3029_STATUS_PON | RV3029_STATUS_VLOW2, 0); +} + +static int rv3029_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) +{ + struct rv3029_data *rv3029 = dev_get_drvdata(dev); + unsigned long vl = 0; + int sr, ret = 0; + + switch (cmd) { + case RTC_VL_READ: + ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr); + if (ret < 0) + return ret; + + if (sr & RV3029_STATUS_VLOW1) + vl = RTC_VL_ACCURACY_LOW; + + if (sr & (RV3029_STATUS_VLOW2 | RV3029_STATUS_PON)) + vl |= RTC_VL_DATA_INVALID; + + return put_user(vl, (unsigned int __user *)arg); + + case RTC_VL_CLR: + return regmap_update_bits(rv3029->regmap, RV3029_STATUS, + RV3029_STATUS_VLOW1, 0); + + default: + return -ENOIOCTLCMD; + } +} + +static int rv3029_nvram_write(void *priv, unsigned int offset, void *val, + size_t bytes) +{ + return regmap_bulk_write(priv, RV3029_RAM_PAGE + offset, val, bytes); +} + +static int rv3029_nvram_read(void *priv, unsigned int offset, void *val, + size_t bytes) +{ + return regmap_bulk_read(priv, RV3029_RAM_PAGE + offset, val, bytes); +} + +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 rv3029_data *rv3029 = dev_get_drvdata(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(rv3029, 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 rv3029_data *rv3029, int *temp_mC) +{ + unsigned int temp; + int ret; + + ret = regmap_read(rv3029->regmap, RV3029_TEMP_PAGE, &temp); + 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) +{ + struct rv3029_data *rv3029 = dev_get_drvdata(dev); + int ret, temp_mC; + + ret = rv3029_read_temp(rv3029, &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) +{ + struct rv3029_data *rv3029 = dev_get_drvdata(dev); + unsigned int th_set_bits = 0; + unsigned long interval_ms; + int ret; + + 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(rv3029, 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) +{ + struct rv3029_data *rv3029 = dev_get_drvdata(dev); + int ret, interval_ms; + u8 eectrl; + + ret = rv3029_eeprom_read(rv3029, 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 const struct rtc_class_ops rv3029_rtc_ops = { + .read_time = rv3029_read_time, + .set_time = rv3029_set_time, + .ioctl = rv3029_ioctl, + .read_alarm = rv3029_read_alarm, + .set_alarm = rv3029_set_alarm, + .alarm_irq_enable = rv3029_alarm_irq_enable, +}; + +static int rv3029_probe(struct device *dev, struct regmap *regmap, int irq, + const char *name) +{ + struct rv3029_data *rv3029; + struct nvmem_config nvmem_cfg = { + .name = "rv3029_nvram", + .word_size = 1, + .stride = 1, + .size = RV3029_RAM_SECTION_LEN, + .type = NVMEM_TYPE_BATTERY_BACKED, + .reg_read = rv3029_nvram_read, + .reg_write = rv3029_nvram_write, + }; + int rc = 0; + + 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); + + rv3029_trickle_config(dev); + rv3029_hwmon_register(dev, name); + + rv3029->rtc = devm_rtc_allocate_device(dev); + if (IS_ERR(rv3029->rtc)) + return PTR_ERR(rv3029->rtc); + + if (rv3029->irq > 0) { + unsigned long irqflags = IRQF_TRIGGER_LOW; + + if (dev_fwnode(dev)) + irqflags = 0; + + rc = devm_request_threaded_irq(dev, rv3029->irq, + NULL, rv3029_handle_irq, + irqflags | IRQF_ONESHOT, + "rv3029", dev); + if (rc) { + dev_warn(dev, "unable to request IRQ, alarms disabled\n"); + rv3029->irq = 0; + } + } + if (!rv3029->irq) + clear_bit(RTC_FEATURE_ALARM, rv3029->rtc->features); + + rv3029->rtc->ops = &rv3029_rtc_ops; + rv3029->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; + rv3029->rtc->range_max = RTC_TIMESTAMP_END_2079; + + rc = devm_rtc_register_device(rv3029->rtc); + if (rc) + return rc; + + nvmem_cfg.priv = rv3029->regmap; + devm_rtc_nvmem_register(rv3029->rtc, &nvmem_cfg); + + return 0; +} + +static const struct regmap_range rv3029_holes_range[] = { + regmap_reg_range(0x05, 0x07), + regmap_reg_range(0x0f, 0x0f), + regmap_reg_range(0x17, 0x17), + regmap_reg_range(0x1a, 0x1f), + regmap_reg_range(0x21, 0x27), + regmap_reg_range(0x34, 0x37), +}; + +static const struct regmap_access_table rv3029_regs = { + .no_ranges = rv3029_holes_range, + .n_no_ranges = ARRAY_SIZE(rv3029_holes_range), +}; + +static const struct regmap_config config = { + .reg_bits = 8, + .val_bits = 8, + .rd_table = &rv3029_regs, + .wr_table = &rv3029_regs, + .max_register = 0x3f, +}; + +#if IS_ENABLED(CONFIG_I2C) + +static int rv3029_i2c_probe(struct i2c_client *client) +{ + struct regmap *regmap; + 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)) + 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 __maybe_unused struct of_device_id rv3029_of_match[] = { + { .compatible = "microcrystal,rv3029" }, + { } +}; +MODULE_DEVICE_TABLE(of, rv3029_of_match); + +static struct i2c_driver rv3029_driver = { + .driver = { + .name = "rv3029", + .of_match_table = of_match_ptr(rv3029_of_match), + }, + .probe = rv3029_i2c_probe, + .id_table = rv3029_id, +}; + +static int __init rv3029_register_driver(void) +{ + return i2c_add_driver(&rv3029_driver); +} + +static void rv3029_unregister_driver(void) +{ + i2c_del_driver(&rv3029_driver); +} + +#else + +static int __init 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) +{ + struct regmap *regmap; + + regmap = devm_regmap_init_spi(spi, &config); + if (IS_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 __init rv3049_register_driver(void) +{ + return spi_register_driver(&rv3049_driver); +} + +static void __exit rv3049_unregister_driver(void) +{ + spi_unregister_driver(&rv3049_driver); +} + +#else + +static int __init rv3049_register_driver(void) +{ + return 0; +} + +static void __exit rv3049_unregister_driver(void) +{ +} + +#endif + +static int __init rv30x9_init(void) +{ + int ret; + + ret = rv3029_register_driver(); + if (ret) + return ret; + + ret = rv3049_register_driver(); + if (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"); |