// SPDX-License-Identifier: GPL-2.0 /* * RTC driver for the MAX31335 * * Copyright (C) 2023 Analog Devices * * Antoniu Miclaus <[email protected]> * */ #include <linux/unaligned.h> #include <linux/bcd.h> #include <linux/bitfield.h> #include <linux/bitops.h> #include <linux/clk.h> #include <linux/clk-provider.h> #include <linux/hwmon.h> #include <linux/i2c.h> #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of_device.h> #include <linux/regmap.h> #include <linux/rtc.h> #include <linux/util_macros.h> /* MAX31335 Register Map */ #define MAX31335_STATUS1 … #define MAX31335_INT_EN1 … #define MAX31335_STATUS2 … #define MAX31335_INT_EN2 … #define MAX31335_RTC_RESET … #define MAX31335_RTC_CONFIG … #define MAX31335_RTC_CONFIG2 … #define MAX31335_TIMESTAMP_CONFIG … #define MAX31335_TIMER_CONFIG … #define MAX31335_SECONDS_1_128 … #define MAX31335_SECONDS … #define MAX31335_MINUTES … #define MAX31335_HOURS … #define MAX31335_DAY … #define MAX31335_DATE … #define MAX31335_MONTH … #define MAX31335_YEAR … #define MAX31335_ALM1_SEC … #define MAX31335_ALM1_MIN … #define MAX31335_ALM1_HRS … #define MAX31335_ALM1_DAY_DATE … #define MAX31335_ALM1_MON … #define MAX31335_ALM1_YEAR … #define MAX31335_ALM2_MIN … #define MAX31335_ALM2_HRS … #define MAX31335_ALM2_DAY_DATE … #define MAX31335_TIMER_COUNT … #define MAX31335_TIMER_INIT … #define MAX31335_PWR_MGMT … #define MAX31335_TRICKLE_REG … #define MAX31335_AGING_OFFSET … #define MAX31335_TS_CONFIG … #define MAX31335_TEMP_ALARM_HIGH_MSB … #define MAX31335_TEMP_ALARM_HIGH_LSB … #define MAX31335_TEMP_ALARM_LOW_MSB … #define MAX31335_TEMP_ALARM_LOW_LSB … #define MAX31335_TEMP_DATA_MSB … #define MAX31335_TEMP_DATA_LSB … #define MAX31335_TS0_SEC_1_128 … #define MAX31335_TS0_SEC … #define MAX31335_TS0_MIN … #define MAX31335_TS0_HOUR … #define MAX31335_TS0_DATE … #define MAX31335_TS0_MONTH … #define MAX31335_TS0_YEAR … #define MAX31335_TS0_FLAGS … #define MAX31335_TS1_SEC_1_128 … #define MAX31335_TS1_SEC … #define MAX31335_TS1_MIN … #define MAX31335_TS1_HOUR … #define MAX31335_TS1_DATE … #define MAX31335_TS1_MONTH … #define MAX31335_TS1_YEAR … #define MAX31335_TS1_FLAGS … #define MAX31335_TS2_SEC_1_128 … #define MAX31335_TS2_SEC … #define MAX31335_TS2_MIN … #define MAX31335_TS2_HOUR … #define MAX31335_TS2_DATE … #define MAX31335_TS2_MONTH … #define MAX31335_TS2_YEAR … #define MAX31335_TS2_FLAGS … #define MAX31335_TS3_SEC_1_128 … #define MAX31335_TS3_SEC … #define MAX31335_TS3_MIN … #define MAX31335_TS3_HOUR … #define MAX31335_TS3_DATE … #define MAX31335_TS3_MONTH … #define MAX31335_TS3_YEAR … #define MAX31335_TS3_FLAGS … /* MAX31335_STATUS1 Bit Definitions */ #define MAX31335_STATUS1_PSDECT … #define MAX31335_STATUS1_OSF … #define MAX31335_STATUS1_PFAIL … #define MAX31335_STATUS1_VBATLOW … #define MAX31335_STATUS1_DIF … #define MAX31335_STATUS1_TIF … #define MAX31335_STATUS1_A2F … #define MAX31335_STATUS1_A1F … /* MAX31335_INT_EN1 Bit Definitions */ #define MAX31335_INT_EN1_DOSF … #define MAX31335_INT_EN1_PFAILE … #define MAX31335_INT_EN1_VBATLOWE … #define MAX31335_INT_EN1_DIE … #define MAX31335_INT_EN1_TIE … #define MAX31335_INT_EN1_A2IE … #define MAX31335_INT_EN1_A1IE … /* MAX31335_STATUS2 Bit Definitions */ #define MAX31335_STATUS2_TEMP_RDY … #define MAX31335_STATUS2_OTF … #define MAX31335_STATUS2_UTF … /* MAX31335_INT_EN2 Bit Definitions */ #define MAX31335_INT_EN2_TEMP_RDY_EN … #define MAX31335_INT_EN2_OTIE … #define MAX31335_INT_EN2_UTIE … /* MAX31335_RTC_RESET Bit Definitions */ #define MAX31335_RTC_RESET_SWRST … /* MAX31335_RTC_CONFIG1 Bit Definitions */ #define MAX31335_RTC_CONFIG1_EN_IO … #define MAX31335_RTC_CONFIG1_A1AC … #define MAX31335_RTC_CONFIG1_DIP … #define MAX31335_RTC_CONFIG1_I2C_TIMEOUT … #define MAX31335_RTC_CONFIG1_EN_OSC … /* MAX31335_RTC_CONFIG2 Bit Definitions */ #define MAX31335_RTC_CONFIG2_ENCLKO … #define MAX31335_RTC_CONFIG2_CLKO_HZ … /* MAX31335_TIMESTAMP_CONFIG Bit Definitions */ #define MAX31335_TIMESTAMP_CONFIG_TSVLOW … #define MAX31335_TIMESTAMP_CONFIG_TSPWM … #define MAX31335_TIMESTAMP_CONFIG_TSDIN … #define MAX31335_TIMESTAMP_CONFIG_TSOW … #define MAX31335_TIMESTAMP_CONFIG_TSR … #define MAX31335_TIMESTAMP_CONFIG_TSE … /* MAX31335_TIMER_CONFIG Bit Definitions */ #define MAX31335_TIMER_CONFIG_TE … #define MAX31335_TIMER_CONFIG_TPAUSE … #define MAX31335_TIMER_CONFIG_TRPT … #define MAX31335_TIMER_CONFIG_TFS … /* MAX31335_HOURS Bit Definitions */ #define MAX31335_HOURS_F_24_12 … #define MAX31335_HOURS_HR_20_AM_PM … /* MAX31335_MONTH Bit Definitions */ #define MAX31335_MONTH_CENTURY … /* MAX31335_PWR_MGMT Bit Definitions */ #define MAX31335_PWR_MGMT_PFVT … /* MAX31335_TRICKLE_REG Bit Definitions */ #define MAX31335_TRICKLE_REG_TRICKLE … #define MAX31335_TRICKLE_REG_EN_TRICKLE … /* MAX31335_TS_CONFIG Bit Definitions */ #define MAX31335_TS_CONFIG_AUTO … #define MAX31335_TS_CONFIG_CONVERT_T … #define MAX31335_TS_CONFIG_TSINT … /* MAX31335_TS_FLAGS Bit Definitions */ #define MAX31335_TS_FLAGS_VLOWF … #define MAX31335_TS_FLAGS_VBATF … #define MAX31335_TS_FLAGS_VCCF … #define MAX31335_TS_FLAGS_DINF … /* MAX31335 Miscellaneous Definitions */ #define MAX31335_TRICKLE_SCHOTTKY_DIODE … #define MAX31335_TRICKLE_STANDARD_DIODE … #define MAX31335_RAM_SIZE … #define MAX31335_TIME_SIZE … #define clk_hw_to_max31335(_hw) … struct max31335_data { … }; static const int max31335_clkout_freq[] = …; static const u16 max31335_trickle_resistors[] = …; static bool max31335_volatile_reg(struct device *dev, unsigned int reg) { … } static const struct regmap_config regmap_config = …; static int max31335_read_time(struct device *dev, struct rtc_time *tm) { … } static int max31335_set_time(struct device *dev, struct rtc_time *tm) { … } static int max31335_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) { … } static int max31335_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) { … } static int max31335_alarm_irq_enable(struct device *dev, unsigned int enabled) { … } static irqreturn_t max31335_handle_irq(int irq, void *dev_id) { … } static const struct rtc_class_ops max31335_rtc_ops = …; static int max31335_trickle_charger_setup(struct device *dev, struct max31335_data *max31335) { … } static unsigned long max31335_clkout_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) { … } static long max31335_clkout_round_rate(struct clk_hw *hw, unsigned long rate, unsigned long *prate) { … } static int max31335_clkout_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long parent_rate) { … } static int max31335_clkout_enable(struct clk_hw *hw) { … } static void max31335_clkout_disable(struct clk_hw *hw) { … } static int max31335_clkout_is_enabled(struct clk_hw *hw) { … } static const struct clk_ops max31335_clkout_ops = …; static struct clk_init_data max31335_clk_init = …; static int max31335_nvmem_reg_read(void *priv, unsigned int offset, void *val, size_t bytes) { … } static int max31335_nvmem_reg_write(void *priv, unsigned int offset, void *val, size_t bytes) { … } static struct nvmem_config max31335_nvmem_cfg = …; #if IS_REACHABLE(HWMON) static int max31335_read_temp(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *val) { struct max31335_data *max31335 = dev_get_drvdata(dev); u8 reg[2]; s16 temp; int ret; if (type != hwmon_temp || attr != hwmon_temp_input) return -EOPNOTSUPP; ret = regmap_bulk_read(max31335->regmap, MAX31335_TEMP_DATA_MSB, reg, 2); if (ret) return ret; temp = get_unaligned_be16(reg); *val = (temp / 64) * 250; return 0; } static umode_t max31335_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr, int channel) { if (type == hwmon_temp && attr == hwmon_temp_input) return 0444; return 0; } static const struct hwmon_channel_info *max31335_info[] = { HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT), NULL }; static const struct hwmon_ops max31335_hwmon_ops = { .is_visible = max31335_is_visible, .read = max31335_read_temp, }; static const struct hwmon_chip_info max31335_chip_info = { .ops = &max31335_hwmon_ops, .info = max31335_info, }; #endif static int max31335_clkout_register(struct device *dev) { … } static int max31335_probe(struct i2c_client *client) { … } static const struct i2c_device_id max31335_id[] = …; MODULE_DEVICE_TABLE(i2c, max31335_id); static const struct of_device_id max31335_of_match[] = …; MODULE_DEVICE_TABLE(of, max31335_of_match); static struct i2c_driver max31335_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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