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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Real Time Clock driver for AB-RTCMC-32.768kHz-EOZ9 chip.
- * Copyright (C) 2019 Orolia
- *
- */
- #include <linux/module.h>
- #include <linux/rtc.h>
- #include <linux/i2c.h>
- #include <linux/bcd.h>
- #include <linux/of.h>
- #include <linux/regmap.h>
- #include <linux/bitfield.h>
- #include <linux/hwmon.h>
- #include <linux/hwmon-sysfs.h>
- #define ABEOZ9_REG_CTRL1 0x00
- #define ABEOZ9_REG_CTRL1_MASK GENMASK(7, 0)
- #define ABEOZ9_REG_CTRL1_WE BIT(0)
- #define ABEOZ9_REG_CTRL1_TE BIT(1)
- #define ABEOZ9_REG_CTRL1_TAR BIT(2)
- #define ABEOZ9_REG_CTRL1_EERE BIT(3)
- #define ABEOZ9_REG_CTRL1_SRON BIT(4)
- #define ABEOZ9_REG_CTRL1_TD0 BIT(5)
- #define ABEOZ9_REG_CTRL1_TD1 BIT(6)
- #define ABEOZ9_REG_CTRL1_CLKINT BIT(7)
- #define ABEOZ9_REG_CTRL_INT 0x01
- #define ABEOZ9_REG_CTRL_INT_AIE BIT(0)
- #define ABEOZ9_REG_CTRL_INT_TIE BIT(1)
- #define ABEOZ9_REG_CTRL_INT_V1IE BIT(2)
- #define ABEOZ9_REG_CTRL_INT_V2IE BIT(3)
- #define ABEOZ9_REG_CTRL_INT_SRIE BIT(4)
- #define ABEOZ9_REG_CTRL_INT_FLAG 0x02
- #define ABEOZ9_REG_CTRL_INT_FLAG_AF BIT(0)
- #define ABEOZ9_REG_CTRL_INT_FLAG_TF BIT(1)
- #define ABEOZ9_REG_CTRL_INT_FLAG_V1IF BIT(2)
- #define ABEOZ9_REG_CTRL_INT_FLAG_V2IF BIT(3)
- #define ABEOZ9_REG_CTRL_INT_FLAG_SRF BIT(4)
- #define ABEOZ9_REG_CTRL_STATUS 0x03
- #define ABEOZ9_REG_CTRL_STATUS_V1F BIT(2)
- #define ABEOZ9_REG_CTRL_STATUS_V2F BIT(3)
- #define ABEOZ9_REG_CTRL_STATUS_SR BIT(4)
- #define ABEOZ9_REG_CTRL_STATUS_PON BIT(5)
- #define ABEOZ9_REG_CTRL_STATUS_EEBUSY BIT(7)
- #define ABEOZ9_REG_SEC 0x08
- #define ABEOZ9_REG_MIN 0x09
- #define ABEOZ9_REG_HOURS 0x0A
- #define ABEOZ9_HOURS_PM BIT(6)
- #define ABEOZ9_REG_DAYS 0x0B
- #define ABEOZ9_REG_WEEKDAYS 0x0C
- #define ABEOZ9_REG_MONTHS 0x0D
- #define ABEOZ9_REG_YEARS 0x0E
- #define ABEOZ9_SEC_LEN 7
- #define ABEOZ9_REG_ALARM_SEC 0x10
- #define ABEOZ9_BIT_ALARM_SEC GENMASK(6, 0)
- #define ABEOZ9_REG_ALARM_MIN 0x11
- #define ABEOZ9_BIT_ALARM_MIN GENMASK(6, 0)
- #define ABEOZ9_REG_ALARM_HOURS 0x12
- #define ABEOZ9_BIT_ALARM_HOURS_PM BIT(5)
- #define ABEOZ9_BIT_ALARM_HOURS GENMASK(4, 0)
- #define ABEOZ9_REG_ALARM_DAYS 0x13
- #define ABEOZ9_BIT_ALARM_DAYS GENMASK(5, 0)
- #define ABEOZ9_REG_ALARM_WEEKDAYS 0x14
- #define ABEOZ9_BIT_ALARM_WEEKDAYS GENMASK(2, 0)
- #define ABEOZ9_REG_ALARM_MONTHS 0x15
- #define ABEOZ9_BIT_ALARM_MONTHS GENMASK(4, 0)
- #define ABEOZ9_REG_ALARM_YEARS 0x16
- #define ABEOZ9_ALARM_LEN 7
- #define ABEOZ9_BIT_ALARM_AE BIT(7)
- #define ABEOZ9_REG_REG_TEMP 0x20
- #define ABEOZ953_TEMP_MAX 120
- #define ABEOZ953_TEMP_MIN -60
- #define ABEOZ9_REG_EEPROM 0x30
- #define ABEOZ9_REG_EEPROM_MASK GENMASK(8, 0)
- #define ABEOZ9_REG_EEPROM_THP BIT(0)
- #define ABEOZ9_REG_EEPROM_THE BIT(1)
- #define ABEOZ9_REG_EEPROM_FD0 BIT(2)
- #define ABEOZ9_REG_EEPROM_FD1 BIT(3)
- #define ABEOZ9_REG_EEPROM_R1K BIT(4)
- #define ABEOZ9_REG_EEPROM_R5K BIT(5)
- #define ABEOZ9_REG_EEPROM_R20K BIT(6)
- #define ABEOZ9_REG_EEPROM_R80K BIT(7)
- struct abeoz9_rtc_data {
- struct rtc_device *rtc;
- struct regmap *regmap;
- struct device *hwmon_dev;
- };
- static int abeoz9_check_validity(struct device *dev)
- {
- struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
- struct regmap *regmap = data->regmap;
- int ret;
- int val;
- ret = regmap_read(regmap, ABEOZ9_REG_CTRL_STATUS, &val);
- if (ret < 0) {
- dev_err(dev,
- "unable to get CTRL_STATUS register (%d)\n", ret);
- return ret;
- }
- if (val & ABEOZ9_REG_CTRL_STATUS_PON) {
- dev_warn(dev, "power-on reset detected, date is invalid\n");
- return -EINVAL;
- }
- if (val & ABEOZ9_REG_CTRL_STATUS_V1F) {
- dev_warn(dev,
- "voltage drops below VLOW1 threshold, date is invalid\n");
- return -EINVAL;
- }
- if ((val & ABEOZ9_REG_CTRL_STATUS_V2F)) {
- dev_warn(dev,
- "voltage drops below VLOW2 threshold, date is invalid\n");
- return -EINVAL;
- }
- return 0;
- }
- static int abeoz9_reset_validity(struct regmap *regmap)
- {
- return regmap_update_bits(regmap, ABEOZ9_REG_CTRL_STATUS,
- ABEOZ9_REG_CTRL_STATUS_V1F |
- ABEOZ9_REG_CTRL_STATUS_V2F |
- ABEOZ9_REG_CTRL_STATUS_PON,
- 0);
- }
- static int abeoz9_rtc_get_time(struct device *dev, struct rtc_time *tm)
- {
- struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
- u8 regs[ABEOZ9_SEC_LEN];
- int ret;
- ret = abeoz9_check_validity(dev);
- if (ret)
- return ret;
- ret = regmap_bulk_read(data->regmap, ABEOZ9_REG_SEC,
- regs,
- sizeof(regs));
- if (ret) {
- dev_err(dev, "reading RTC time failed (%d)\n", ret);
- return ret;
- }
- tm->tm_sec = bcd2bin(regs[ABEOZ9_REG_SEC - ABEOZ9_REG_SEC] & 0x7F);
- tm->tm_min = bcd2bin(regs[ABEOZ9_REG_MIN - ABEOZ9_REG_SEC] & 0x7F);
- if (regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC] & ABEOZ9_HOURS_PM) {
- tm->tm_hour =
- bcd2bin(regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC] & 0x1f);
- if (regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC] & ABEOZ9_HOURS_PM)
- tm->tm_hour += 12;
- } else {
- tm->tm_hour = bcd2bin(regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC]);
- }
- tm->tm_mday = bcd2bin(regs[ABEOZ9_REG_DAYS - ABEOZ9_REG_SEC]);
- tm->tm_wday = bcd2bin(regs[ABEOZ9_REG_WEEKDAYS - ABEOZ9_REG_SEC]);
- tm->tm_mon = bcd2bin(regs[ABEOZ9_REG_MONTHS - ABEOZ9_REG_SEC]) - 1;
- tm->tm_year = bcd2bin(regs[ABEOZ9_REG_YEARS - ABEOZ9_REG_SEC]) + 100;
- return ret;
- }
- static int abeoz9_rtc_set_time(struct device *dev, struct rtc_time *tm)
- {
- struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
- struct regmap *regmap = data->regmap;
- u8 regs[ABEOZ9_SEC_LEN];
- int ret;
- regs[ABEOZ9_REG_SEC - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_sec);
- regs[ABEOZ9_REG_MIN - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_min);
- regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_hour);
- regs[ABEOZ9_REG_DAYS - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_mday);
- regs[ABEOZ9_REG_WEEKDAYS - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_wday);
- regs[ABEOZ9_REG_MONTHS - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_mon + 1);
- regs[ABEOZ9_REG_YEARS - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_year - 100);
- ret = regmap_bulk_write(data->regmap, ABEOZ9_REG_SEC,
- regs,
- sizeof(regs));
- if (ret) {
- dev_err(dev, "set RTC time failed (%d)\n", ret);
- return ret;
- }
- return abeoz9_reset_validity(regmap);
- }
- static int abeoz9_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
- {
- struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
- struct regmap *regmap = data->regmap;
- u8 regs[ABEOZ9_ALARM_LEN];
- u8 val[2];
- int ret;
- ret = abeoz9_check_validity(dev);
- if (ret)
- return ret;
- ret = regmap_bulk_read(regmap, ABEOZ9_REG_CTRL_INT, val, sizeof(val));
- if (ret)
- return ret;
- alarm->enabled = val[0] & ABEOZ9_REG_CTRL_INT_AIE;
- alarm->pending = val[1] & ABEOZ9_REG_CTRL_INT_FLAG_AF;
- ret = regmap_bulk_read(regmap, ABEOZ9_REG_ALARM_SEC, regs, sizeof(regs));
- if (ret)
- return ret;
- alarm->time.tm_sec = bcd2bin(FIELD_GET(ABEOZ9_BIT_ALARM_SEC, regs[0]));
- alarm->time.tm_min = bcd2bin(FIELD_GET(ABEOZ9_BIT_ALARM_MIN, regs[1]));
- alarm->time.tm_hour = bcd2bin(FIELD_GET(ABEOZ9_BIT_ALARM_HOURS, regs[2]));
- if (FIELD_GET(ABEOZ9_BIT_ALARM_HOURS_PM, regs[2]))
- alarm->time.tm_hour += 12;
- alarm->time.tm_mday = bcd2bin(FIELD_GET(ABEOZ9_BIT_ALARM_DAYS, regs[3]));
- return 0;
- }
- static int abeoz9_rtc_alarm_irq_enable(struct device *dev, u32 enable)
- {
- struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
- return regmap_update_bits(data->regmap, ABEOZ9_REG_CTRL_INT,
- ABEOZ9_REG_CTRL_INT_AIE,
- FIELD_PREP(ABEOZ9_REG_CTRL_INT_AIE, enable));
- }
- static int abeoz9_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
- {
- struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
- u8 regs[ABEOZ9_ALARM_LEN] = {0};
- int ret;
- ret = regmap_update_bits(data->regmap, ABEOZ9_REG_CTRL_INT_FLAG,
- ABEOZ9_REG_CTRL_INT_FLAG_AF, 0);
- if (ret)
- return ret;
- regs[0] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_SEC,
- bin2bcd(alarm->time.tm_sec));
- regs[1] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_MIN,
- bin2bcd(alarm->time.tm_min));
- regs[2] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_HOURS,
- bin2bcd(alarm->time.tm_hour));
- regs[3] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_DAYS,
- bin2bcd(alarm->time.tm_mday));
- ret = regmap_bulk_write(data->regmap, ABEOZ9_REG_ALARM_SEC, regs,
- sizeof(regs));
- if (ret)
- return ret;
- return abeoz9_rtc_alarm_irq_enable(dev, alarm->enabled);
- }
- static irqreturn_t abeoz9_rtc_irq(int irq, void *dev)
- {
- struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
- unsigned int val;
- int ret;
- ret = regmap_read(data->regmap, ABEOZ9_REG_CTRL_INT_FLAG, &val);
- if (ret)
- return IRQ_NONE;
- if (!FIELD_GET(ABEOZ9_REG_CTRL_INT_FLAG_AF, val))
- return IRQ_NONE;
- regmap_update_bits(data->regmap, ABEOZ9_REG_CTRL_INT_FLAG,
- ABEOZ9_REG_CTRL_INT_FLAG_AF, 0);
- rtc_update_irq(data->rtc, 1, RTC_IRQF | RTC_AF);
- return IRQ_HANDLED;
- }
- static int abeoz9_trickle_parse_dt(struct device_node *node)
- {
- u32 ohms = 0;
- if (of_property_read_u32(node, "trickle-resistor-ohms", &ohms))
- return 0;
- switch (ohms) {
- case 1000:
- return ABEOZ9_REG_EEPROM_R1K;
- case 5000:
- return ABEOZ9_REG_EEPROM_R5K;
- case 20000:
- return ABEOZ9_REG_EEPROM_R20K;
- case 80000:
- return ABEOZ9_REG_EEPROM_R80K;
- default:
- return 0;
- }
- }
- static int abeoz9_rtc_setup(struct device *dev, struct device_node *node)
- {
- struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
- struct regmap *regmap = data->regmap;
- int ret;
- /* Enable Self Recovery, Clock for Watch and EEPROM refresh functions */
- ret = regmap_update_bits(regmap, ABEOZ9_REG_CTRL1,
- ABEOZ9_REG_CTRL1_MASK,
- ABEOZ9_REG_CTRL1_WE |
- ABEOZ9_REG_CTRL1_EERE |
- ABEOZ9_REG_CTRL1_SRON);
- if (ret < 0) {
- dev_err(dev, "unable to set CTRL_1 register (%d)\n", ret);
- return ret;
- }
- ret = regmap_write(regmap, ABEOZ9_REG_CTRL_INT, 0);
- if (ret < 0) {
- dev_err(dev,
- "unable to set control CTRL_INT register (%d)\n",
- ret);
- return ret;
- }
- ret = regmap_write(regmap, ABEOZ9_REG_CTRL_INT_FLAG, 0);
- if (ret < 0) {
- dev_err(dev,
- "unable to set control CTRL_INT_FLAG register (%d)\n",
- ret);
- return ret;
- }
- ret = abeoz9_trickle_parse_dt(node);
- /* Enable built-in termometer */
- ret |= ABEOZ9_REG_EEPROM_THE;
- ret = regmap_update_bits(regmap, ABEOZ9_REG_EEPROM,
- ABEOZ9_REG_EEPROM_MASK,
- ret);
- if (ret < 0) {
- dev_err(dev, "unable to set EEPROM register (%d)\n", ret);
- return ret;
- }
- return ret;
- }
- static const struct rtc_class_ops rtc_ops = {
- .read_time = abeoz9_rtc_get_time,
- .set_time = abeoz9_rtc_set_time,
- .read_alarm = abeoz9_rtc_read_alarm,
- .set_alarm = abeoz9_rtc_set_alarm,
- .alarm_irq_enable = abeoz9_rtc_alarm_irq_enable,
- };
- static const struct regmap_config abeoz9_rtc_regmap_config = {
- .reg_bits = 8,
- .val_bits = 8,
- .max_register = 0x3f,
- };
- #if IS_REACHABLE(CONFIG_HWMON)
- static int abeoz9z3_temp_read(struct device *dev,
- enum hwmon_sensor_types type,
- u32 attr, int channel, long *temp)
- {
- struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
- struct regmap *regmap = data->regmap;
- int ret;
- unsigned int val;
- ret = regmap_read(regmap, ABEOZ9_REG_CTRL_STATUS, &val);
- if (ret < 0)
- return ret;
- if ((val & ABEOZ9_REG_CTRL_STATUS_V1F) ||
- (val & ABEOZ9_REG_CTRL_STATUS_V2F)) {
- dev_err(dev,
- "thermometer might be disabled due to low voltage\n");
- return -EINVAL;
- }
- switch (attr) {
- case hwmon_temp_input:
- ret = regmap_read(regmap, ABEOZ9_REG_REG_TEMP, &val);
- if (ret < 0)
- return ret;
- *temp = 1000 * (val + ABEOZ953_TEMP_MIN);
- return 0;
- case hwmon_temp_max:
- *temp = 1000 * ABEOZ953_TEMP_MAX;
- return 0;
- case hwmon_temp_min:
- *temp = 1000 * ABEOZ953_TEMP_MIN;
- return 0;
- default:
- return -EOPNOTSUPP;
- }
- }
- static umode_t abeoz9_is_visible(const void *data,
- enum hwmon_sensor_types type,
- u32 attr, int channel)
- {
- switch (attr) {
- case hwmon_temp_input:
- case hwmon_temp_max:
- case hwmon_temp_min:
- return 0444;
- default:
- return 0;
- }
- }
- static const u32 abeoz9_chip_config[] = {
- HWMON_C_REGISTER_TZ,
- 0
- };
- static const struct hwmon_channel_info abeoz9_chip = {
- .type = hwmon_chip,
- .config = abeoz9_chip_config,
- };
- static const u32 abeoz9_temp_config[] = {
- HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN,
- 0
- };
- static const struct hwmon_channel_info abeoz9_temp = {
- .type = hwmon_temp,
- .config = abeoz9_temp_config,
- };
- static const struct hwmon_channel_info *abeoz9_info[] = {
- &abeoz9_chip,
- &abeoz9_temp,
- NULL
- };
- static const struct hwmon_ops abeoz9_hwmon_ops = {
- .is_visible = abeoz9_is_visible,
- .read = abeoz9z3_temp_read,
- };
- static const struct hwmon_chip_info abeoz9_chip_info = {
- .ops = &abeoz9_hwmon_ops,
- .info = abeoz9_info,
- };
- static void abeoz9_hwmon_register(struct device *dev,
- struct abeoz9_rtc_data *data)
- {
- data->hwmon_dev =
- devm_hwmon_device_register_with_info(dev,
- "abeoz9",
- data,
- &abeoz9_chip_info,
- NULL);
- if (IS_ERR(data->hwmon_dev)) {
- dev_warn(dev, "unable to register hwmon device %ld\n",
- PTR_ERR(data->hwmon_dev));
- }
- }
- #else
- static void abeoz9_hwmon_register(struct device *dev,
- struct abeoz9_rtc_data *data)
- {
- }
- #endif
- static int abeoz9_probe(struct i2c_client *client)
- {
- struct abeoz9_rtc_data *data = NULL;
- struct device *dev = &client->dev;
- struct regmap *regmap;
- int ret;
- if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
- I2C_FUNC_SMBUS_BYTE_DATA |
- I2C_FUNC_SMBUS_I2C_BLOCK))
- return -ENODEV;
- regmap = devm_regmap_init_i2c(client, &abeoz9_rtc_regmap_config);
- if (IS_ERR(regmap)) {
- ret = PTR_ERR(regmap);
- dev_err(dev, "regmap allocation failed: %d\n", ret);
- return ret;
- }
- data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
- if (!data)
- return -ENOMEM;
- data->regmap = regmap;
- dev_set_drvdata(dev, data);
- ret = abeoz9_rtc_setup(dev, client->dev.of_node);
- if (ret)
- return ret;
- data->rtc = devm_rtc_allocate_device(dev);
- ret = PTR_ERR_OR_ZERO(data->rtc);
- if (ret)
- return ret;
- data->rtc->ops = &rtc_ops;
- data->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
- data->rtc->range_max = RTC_TIMESTAMP_END_2099;
- clear_bit(RTC_FEATURE_ALARM, data->rtc->features);
- if (client->irq > 0) {
- ret = devm_request_threaded_irq(dev, client->irq, NULL,
- abeoz9_rtc_irq,
- IRQF_TRIGGER_LOW | IRQF_ONESHOT,
- dev_name(dev), dev);
- if (ret) {
- dev_err(dev, "failed to request alarm irq\n");
- return ret;
- }
- } else {
- clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, data->rtc->features);
- }
- if (client->irq > 0 || device_property_read_bool(dev, "wakeup-source")) {
- ret = device_init_wakeup(dev, true);
- set_bit(RTC_FEATURE_ALARM, data->rtc->features);
- }
- ret = devm_rtc_register_device(data->rtc);
- if (ret)
- return ret;
- abeoz9_hwmon_register(dev, data);
- return 0;
- }
- #ifdef CONFIG_OF
- static const struct of_device_id abeoz9_dt_match[] = {
- { .compatible = "abracon,abeoz9" },
- { },
- };
- MODULE_DEVICE_TABLE(of, abeoz9_dt_match);
- #endif
- static const struct i2c_device_id abeoz9_id[] = {
- { "abeoz9", 0 },
- { }
- };
- static struct i2c_driver abeoz9_driver = {
- .driver = {
- .name = "rtc-ab-eoz9",
- .of_match_table = of_match_ptr(abeoz9_dt_match),
- },
- .probe_new = abeoz9_probe,
- .id_table = abeoz9_id,
- };
- module_i2c_driver(abeoz9_driver);
- MODULE_AUTHOR("Artem Panfilov <[email protected]>");
- MODULE_DESCRIPTION("Abracon AB-RTCMC-32.768kHz-EOZ9 RTC driver");
- MODULE_LICENSE("GPL");
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