// SPDX-License-Identifier: GPL-2.0-only/* * Driver for the Epson RTC module RX-6110 SA * * Copyright(C) 2015 Pengutronix, Steffen Trumtrar <kernel@pengutronix.de> * Copyright(C) SEIKO EPSON CORPORATION 2013. All rights reserved. */ #include <linux/bcd.h>#include <linux/init.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/regmap.h>#include <linux/rtc.h>#include <linux/of.h>#include <linux/spi/spi.h>#include <linux/i2c.h> /* RX-6110 Register definitions */#define RX6110_REG_SEC 0x10#define RX6110_REG_MIN 0x11#define RX6110_REG_HOUR 0x12#define RX6110_REG_WDAY 0x13#define RX6110_REG_MDAY 0x14#define RX6110_REG_MONTH 0x15#define RX6110_REG_YEAR 0x16#define RX6110_REG_RES1 0x17#define RX6110_REG_ALMIN 0x18#define RX6110_REG_ALHOUR 0x19#define RX6110_REG_ALWDAY 0x1A#define RX6110_REG_TCOUNT0 0x1B#define RX6110_REG_TCOUNT1 0x1C#define RX6110_REG_EXT 0x1D#define RX6110_REG_FLAG 0x1E#define RX6110_REG_CTRL 0x1F#define RX6110_REG_USER0 0x20#define RX6110_REG_USER1 0x21#define RX6110_REG_USER2 0x22#define RX6110_REG_USER3 0x23#define RX6110_REG_USER4 0x24#define RX6110_REG_USER5 0x25#define RX6110_REG_USER6 0x26#define RX6110_REG_USER7 0x27#define RX6110_REG_USER8 0x28#define RX6110_REG_USER9 0x29#define RX6110_REG_USERA 0x2A#define RX6110_REG_USERB 0x2B#define RX6110_REG_USERC 0x2C#define RX6110_REG_USERD 0x2D#define RX6110_REG_USERE 0x2E#define RX6110_REG_USERF 0x2F#define RX6110_REG_RES2 0x30#define RX6110_REG_RES3 0x31#define RX6110_REG_IRQ 0x32 #define RX6110_BIT_ALARM_EN BIT(7) /* Extension Register (1Dh) bit positions */#define RX6110_BIT_EXT_TSEL0 BIT(0)#define RX6110_BIT_EXT_TSEL1 BIT(1)#define RX6110_BIT_EXT_TSEL2 BIT(2)#define RX6110_BIT_EXT_WADA BIT(3)#define RX6110_BIT_EXT_TE BIT(4)#define RX6110_BIT_EXT_USEL BIT(5)#define RX6110_BIT_EXT_FSEL0 BIT(6)#define RX6110_BIT_EXT_FSEL1 BIT(7) /* Flag Register (1Eh) bit positions */#define RX6110_BIT_FLAG_VLF BIT(1)#define RX6110_BIT_FLAG_AF BIT(3)#define RX6110_BIT_FLAG_TF BIT(4)#define RX6110_BIT_FLAG_UF BIT(5) /* Control Register (1Fh) bit positions */#define RX6110_BIT_CTRL_TBKE BIT(0)#define RX6110_BIT_CTRL_TBKON BIT(1)#define RX6110_BIT_CTRL_TSTP BIT(2)#define RX6110_BIT_CTRL_AIE BIT(3)#define RX6110_BIT_CTRL_TIE BIT(4)#define RX6110_BIT_CTRL_UIE BIT(5)#define RX6110_BIT_CTRL_STOP BIT(6)#define RX6110_BIT_CTRL_TEST BIT(7) enum { RTC_SEC = 0, RTC_MIN, RTC_HOUR, RTC_WDAY, RTC_MDAY, RTC_MONTH, RTC_YEAR, RTC_NR_TIME}; #define RX6110_DRIVER_NAME "rx6110" struct rx6110_data { struct rtc_device *rtc; struct regmap *regmap;}; /** * rx6110_rtc_tm_to_data - convert rtc_time to native time encoding * * @tm: holds date and time * @data: holds the encoding in rx6110 native form */static int rx6110_rtc_tm_to_data(struct rtc_time *tm, u8 *data){ pr_debug("%s: date %ptRr\n", __func__, tm); /* * The year in the RTC is a value between 0 and 99. * Assume that this represents the current century * and disregard all other values. */ if (tm->tm_year < 100 || tm->tm_year >= 200) return -EINVAL; data[RTC_SEC] = bin2bcd(tm->tm_sec); data[RTC_MIN] = bin2bcd(tm->tm_min); data[RTC_HOUR] = bin2bcd(tm->tm_hour); data[RTC_WDAY] = BIT(bin2bcd(tm->tm_wday)); data[RTC_MDAY] = bin2bcd(tm->tm_mday); data[RTC_MONTH] = bin2bcd(tm->tm_mon + 1); data[RTC_YEAR] = bin2bcd(tm->tm_year % 100); return 0;} /** * rx6110_data_to_rtc_tm - convert native time encoding to rtc_time * * @data: holds the encoding in rx6110 native form * @tm: holds date and time */static int rx6110_data_to_rtc_tm(u8 *data, struct rtc_time *tm){ tm->tm_sec = bcd2bin(data[RTC_SEC] & 0x7f); tm->tm_min = bcd2bin(data[RTC_MIN] & 0x7f); /* only 24-hour clock */ tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f); tm->tm_wday = ffs(data[RTC_WDAY] & 0x7f); tm->tm_mday = bcd2bin(data[RTC_MDAY] & 0x3f); tm->tm_mon = bcd2bin(data[RTC_MONTH] & 0x1f) - 1; tm->tm_year = bcd2bin(data[RTC_YEAR]) + 100; pr_debug("%s: date %ptRr\n", __func__, tm); /* * The year in the RTC is a value between 0 and 99. * Assume that this represents the current century * and disregard all other values. */ if (tm->tm_year < 100 || tm->tm_year >= 200) return -EINVAL; return 0;} /** * rx6110_set_time - set the current time in the rx6110 registers * * @dev: the rtc device in use * @tm: holds date and time * * BUG: The HW assumes every year that is a multiple of 4 to be a leap * year. Next time this is wrong is 2100, which will not be a leap year * * Note: If STOP is not set/cleared, the clock will start when the seconds * register is written * */static int rx6110_set_time(struct device *dev, struct rtc_time *tm){ struct rx6110_data *rx6110 = dev_get_drvdata(dev); u8 data[RTC_NR_TIME]; int ret; ret = rx6110_rtc_tm_to_data(tm, data); if (ret < 0) return ret; /* set STOP bit before changing clock/calendar */ ret = regmap_update_bits(rx6110->regmap, RX6110_REG_CTRL, RX6110_BIT_CTRL_STOP, RX6110_BIT_CTRL_STOP); if (ret) return ret; ret = regmap_bulk_write(rx6110->regmap, RX6110_REG_SEC, data, RTC_NR_TIME); if (ret) return ret; /* The time in the RTC is valid. Be sure to have VLF cleared. */ ret = regmap_update_bits(rx6110->regmap, RX6110_REG_FLAG, RX6110_BIT_FLAG_VLF, 0); if (ret) return ret; /* clear STOP bit after changing clock/calendar */ ret = regmap_update_bits(rx6110->regmap, RX6110_REG_CTRL, RX6110_BIT_CTRL_STOP, 0); return ret;} /** * rx6110_get_time - get the current time from the rx6110 registers * @dev: the rtc device in use * @tm: holds date and time */static int rx6110_get_time(struct device *dev, struct rtc_time *tm){ struct rx6110_data *rx6110 = dev_get_drvdata(dev); u8 data[RTC_NR_TIME]; int flags; int ret; ret = regmap_read(rx6110->regmap, RX6110_REG_FLAG, &flags); if (ret) return -EINVAL; /* check for VLF Flag (set at power-on) */ if ((flags & RX6110_BIT_FLAG_VLF)) { dev_warn(dev, "Voltage low, data is invalid.\n"); return -EINVAL; } /* read registers to date */ ret = regmap_bulk_read(rx6110->regmap, RX6110_REG_SEC, data, RTC_NR_TIME); if (ret) return ret; ret = rx6110_data_to_rtc_tm(data, tm); if (ret) return ret; dev_dbg(dev, "%s: date %ptRr\n", __func__, tm); return 0;} static const struct reg_sequence rx6110_default_regs[] = { { RX6110_REG_RES1, 0xB8 }, { RX6110_REG_RES2, 0x00 }, { RX6110_REG_RES3, 0x10 }, { RX6110_REG_IRQ, 0x00 }, { RX6110_REG_ALMIN, 0x00 }, { RX6110_REG_ALHOUR, 0x00 }, { RX6110_REG_ALWDAY, 0x00 },}; /** * rx6110_init - initialize the rx6110 registers * * @rx6110: pointer to the rx6110 struct in use * */static int rx6110_init(struct rx6110_data *rx6110){ struct rtc_device *rtc = rx6110->rtc; int flags; int ret; ret = regmap_update_bits(rx6110->regmap, RX6110_REG_EXT, RX6110_BIT_EXT_TE, 0); if (ret) return ret; ret = regmap_register_patch(rx6110->regmap, rx6110_default_regs, ARRAY_SIZE(rx6110_default_regs)); if (ret) return ret; ret = regmap_read(rx6110->regmap, RX6110_REG_FLAG, &flags); if (ret) return ret; /* check for VLF Flag (set at power-on) */ if ((flags & RX6110_BIT_FLAG_VLF)) dev_warn(&rtc->dev, "Voltage low, data loss detected.\n"); /* check for Alarm Flag */ if (flags & RX6110_BIT_FLAG_AF) dev_warn(&rtc->dev, "An alarm may have been missed.\n"); /* check for Periodic Timer Flag */ if (flags & RX6110_BIT_FLAG_TF) dev_warn(&rtc->dev, "Periodic timer was detected\n"); /* check for Update Timer Flag */ if (flags & RX6110_BIT_FLAG_UF) dev_warn(&rtc->dev, "Update timer was detected\n"); /* clear all flags BUT VLF */ ret = regmap_update_bits(rx6110->regmap, RX6110_REG_FLAG, RX6110_BIT_FLAG_AF | RX6110_BIT_FLAG_UF | RX6110_BIT_FLAG_TF, 0); return ret;} static const struct rtc_class_ops rx6110_rtc_ops = { .read_time = rx6110_get_time, .set_time = rx6110_set_time,}; static int rx6110_probe(struct rx6110_data *rx6110, struct device *dev){ int err; rx6110->rtc = devm_rtc_device_register(dev, RX6110_DRIVER_NAME, &rx6110_rtc_ops, THIS_MODULE); if (IS_ERR(rx6110->rtc)) return PTR_ERR(rx6110->rtc); err = rx6110_init(rx6110); if (err) return err; return 0;} #if IS_ENABLED(CONFIG_SPI_MASTER)static const struct regmap_config regmap_spi_config = { .reg_bits = 8, .val_bits = 8, .max_register = RX6110_REG_IRQ, .read_flag_mask = 0x80,}; /** * rx6110_spi_probe - initialize rtc driver * @spi: pointer to spi device */static int rx6110_spi_probe(struct spi_device *spi){ struct rx6110_data *rx6110; if ((spi->bits_per_word && spi->bits_per_word != 8) || (spi->max_speed_hz > 2000000) || (spi->mode != (SPI_CS_HIGH | SPI_CPOL | SPI_CPHA))) { dev_warn(&spi->dev, "SPI settings: bits_per_word: %d, max_speed_hz: %d, mode: %xh\n", spi->bits_per_word, spi->max_speed_hz, spi->mode); dev_warn(&spi->dev, "driving device in an unsupported mode"); } rx6110 = devm_kzalloc(&spi->dev, sizeof(*rx6110), GFP_KERNEL); if (!rx6110) return -ENOMEM; rx6110->regmap = devm_regmap_init_spi(spi, ®map_spi_config); if (IS_ERR(rx6110->regmap)) { dev_err(&spi->dev, "regmap init failed for rtc rx6110\n"); return PTR_ERR(rx6110->regmap); } spi_set_drvdata(spi, rx6110); return rx6110_probe(rx6110, &spi->dev);} static const struct spi_device_id rx6110_spi_id[] = { { "rx6110", 0 }, { }};MODULE_DEVICE_TABLE(spi, rx6110_spi_id); static const __maybe_unused struct of_device_id rx6110_spi_of_match[] = { { .compatible = "epson,rx6110" }, { },};MODULE_DEVICE_TABLE(of, rx6110_spi_of_match); static struct spi_driver rx6110_spi_driver = { .driver = { .name = RX6110_DRIVER_NAME, .of_match_table = of_match_ptr(rx6110_spi_of_match), }, .probe = rx6110_spi_probe, .id_table = rx6110_spi_id,}; static int rx6110_spi_register(void){ return spi_register_driver(&rx6110_spi_driver);} static void rx6110_spi_unregister(void){ spi_unregister_driver(&rx6110_spi_driver);}#elsestatic int rx6110_spi_register(void){ return 0;} static void rx6110_spi_unregister(void){}#endif /* CONFIG_SPI_MASTER */ #if IS_ENABLED(CONFIG_I2C)static const struct regmap_config regmap_i2c_config = { .reg_bits = 8, .val_bits = 8, .max_register = RX6110_REG_IRQ, .read_flag_mask = 0x80,}; static int rx6110_i2c_probe(struct i2c_client *client){ struct i2c_adapter *adapter = client->adapter; struct rx6110_data *rx6110; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK)) { dev_err(&adapter->dev, "doesn't support required functionality\n"); return -EIO; } rx6110 = devm_kzalloc(&client->dev, sizeof(*rx6110), GFP_KERNEL); if (!rx6110) return -ENOMEM; rx6110->regmap = devm_regmap_init_i2c(client, ®map_i2c_config); if (IS_ERR(rx6110->regmap)) { dev_err(&client->dev, "regmap init failed for rtc rx6110\n"); return PTR_ERR(rx6110->regmap); } i2c_set_clientdata(client, rx6110); return rx6110_probe(rx6110, &client->dev);} static const struct acpi_device_id rx6110_i2c_acpi_match[] = { { "SECC6110" }, { }};MODULE_DEVICE_TABLE(acpi, rx6110_i2c_acpi_match); static const struct i2c_device_id rx6110_i2c_id[] = { { .name = "rx6110" }, { }};MODULE_DEVICE_TABLE(i2c, rx6110_i2c_id); static struct i2c_driver rx6110_i2c_driver = { .driver = { .name = RX6110_DRIVER_NAME, .acpi_match_table = rx6110_i2c_acpi_match, }, .probe = rx6110_i2c_probe, .id_table = rx6110_i2c_id,}; static int rx6110_i2c_register(void){ return i2c_add_driver(&rx6110_i2c_driver);} static void rx6110_i2c_unregister(void){ i2c_del_driver(&rx6110_i2c_driver);}#elsestatic int rx6110_i2c_register(void){ return 0;} static void rx6110_i2c_unregister(void){}#endif /* CONFIG_I2C */ static int __init rx6110_module_init(void){ int ret; ret = rx6110_spi_register(); if (ret) return ret; ret = rx6110_i2c_register(); if (ret) rx6110_spi_unregister(); return ret;}module_init(rx6110_module_init);Lines 1–500 of 511. 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// SPDX-License-Identifier: GPL-2.0-only /* * Driver for the Epson RTC module RX-6110 SA * * Copyright(C) 2015 Pengutronix, Steffen Trumtrar <kernel@pengutronix.de> * Copyright(C) SEIKO EPSON CORPORATION 2013. All rights reserved. */ #include <linux/bcd.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/regmap.h> #include <linux/rtc.h> #include <linux/of.h> #include <linux/spi/spi.h> #include <linux/i2c.h> /* RX-6110 Register definitions */ #define RX6110_REG_SEC 0x10 #define RX6110_REG_MIN 0x11 #define RX6110_REG_HOUR 0x12 #define RX6110_REG_WDAY 0x13 #define RX6110_REG_MDAY 0x14 #define RX6110_REG_MONTH 0x15 #define RX6110_REG_YEAR 0x16 #define RX6110_REG_RES1 0x17 #define RX6110_REG_ALMIN 0x18 #define RX6110_REG_ALHOUR 0x19 #define RX6110_REG_ALWDAY 0x1A #define RX6110_REG_TCOUNT0 0x1B #define RX6110_REG_TCOUNT1 0x1C #define RX6110_REG_EXT 0x1D #define RX6110_REG_FLAG 0x1E #define RX6110_REG_CTRL 0x1F #define RX6110_REG_USER0 0x20 #define RX6110_REG_USER1 0x21 #define RX6110_REG_USER2 0x22 #define RX6110_REG_USER3 0x23 #define RX6110_REG_USER4 0x24 #define RX6110_REG_USER5 0x25 #define RX6110_REG_USER6 0x26 #define RX6110_REG_USER7 0x27 #define RX6110_REG_USER8 0x28 #define RX6110_REG_USER9 0x29 #define RX6110_REG_USERA 0x2A #define RX6110_REG_USERB 0x2B #define RX6110_REG_USERC 0x2C #define RX6110_REG_USERD 0x2D #define RX6110_REG_USERE 0x2E #define RX6110_REG_USERF 0x2F #define RX6110_REG_RES2 0x30 #define RX6110_REG_RES3 0x31 #define RX6110_REG_IRQ 0x32 #define RX6110_BIT_ALARM_EN BIT(7) /* Extension Register (1Dh) bit positions */ #define RX6110_BIT_EXT_TSEL0 BIT(0) #define RX6110_BIT_EXT_TSEL1 BIT(1) #define RX6110_BIT_EXT_TSEL2 BIT(2) #define RX6110_BIT_EXT_WADA BIT(3) #define RX6110_BIT_EXT_TE BIT(4) #define RX6110_BIT_EXT_USEL BIT(5) #define RX6110_BIT_EXT_FSEL0 BIT(6) #define RX6110_BIT_EXT_FSEL1 BIT(7) /* Flag Register (1Eh) bit positions */ #define RX6110_BIT_FLAG_VLF BIT(1) #define RX6110_BIT_FLAG_AF BIT(3) #define RX6110_BIT_FLAG_TF BIT(4) #define RX6110_BIT_FLAG_UF BIT(5) /* Control Register (1Fh) bit positions */ #define RX6110_BIT_CTRL_TBKE BIT(0) #define RX6110_BIT_CTRL_TBKON BIT(1) #define RX6110_BIT_CTRL_TSTP BIT(2) #define RX6110_BIT_CTRL_AIE BIT(3) #define RX6110_BIT_CTRL_TIE BIT(4) #define RX6110_BIT_CTRL_UIE BIT(5) #define RX6110_BIT_CTRL_STOP BIT(6) #define RX6110_BIT_CTRL_TEST BIT(7) enum { RTC_SEC = 0, RTC_MIN, RTC_HOUR, RTC_WDAY, RTC_MDAY, RTC_MONTH, RTC_YEAR, RTC_NR_TIME }; #define RX6110_DRIVER_NAME "rx6110" struct rx6110_data { struct rtc_device *rtc; struct regmap *regmap; }; /** * rx6110_rtc_tm_to_data - convert rtc_time to native time encoding * * @tm: holds date and time * @data: holds the encoding in rx6110 native form */ static int rx6110_rtc_tm_to_data(struct rtc_time *tm, u8 *data) { pr_debug("%s: date %ptRr\n", __func__, tm); /* * The year in the RTC is a value between 0 and 99. * Assume that this represents the current century * and disregard all other values. */ if (tm->tm_year < 100 || tm->tm_year >= 200) return -EINVAL; data[RTC_SEC] = bin2bcd(tm->tm_sec); data[RTC_MIN] = bin2bcd(tm->tm_min); data[RTC_HOUR] = bin2bcd(tm->tm_hour); data[RTC_WDAY] = BIT(bin2bcd(tm->tm_wday)); data[RTC_MDAY] = bin2bcd(tm->tm_mday); data[RTC_MONTH] = bin2bcd(tm->tm_mon + 1); data[RTC_YEAR] = bin2bcd(tm->tm_year % 100); return 0; } /** * rx6110_data_to_rtc_tm - convert native time encoding to rtc_time * * @data: holds the encoding in rx6110 native form * @tm: holds date and time */ static int rx6110_data_to_rtc_tm(u8 *data, struct rtc_time *tm) { tm->tm_sec = bcd2bin(data[RTC_SEC] & 0x7f); tm->tm_min = bcd2bin(data[RTC_MIN] & 0x7f); /* only 24-hour clock */ tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f); tm->tm_wday = ffs(data[RTC_WDAY] & 0x7f); tm->tm_mday = bcd2bin(data[RTC_MDAY] & 0x3f); tm->tm_mon = bcd2bin(data[RTC_MONTH] & 0x1f) - 1; tm->tm_year = bcd2bin(data[RTC_YEAR]) + 100; pr_debug("%s: date %ptRr\n", __func__, tm); /* * The year in the RTC is a value between 0 and 99. * Assume that this represents the current century * and disregard all other values. */ if (tm->tm_year < 100 || tm->tm_year >= 200) return -EINVAL; return 0; } /** * rx6110_set_time - set the current time in the rx6110 registers * * @dev: the rtc device in use * @tm: holds date and time * * BUG: The HW assumes every year that is a multiple of 4 to be a leap * year. Next time this is wrong is 2100, which will not be a leap year * * Note: If STOP is not set/cleared, the clock will start when the seconds * register is written * */ static int rx6110_set_time(struct device *dev, struct rtc_time *tm) { struct rx6110_data *rx6110 = dev_get_drvdata(dev); u8 data[RTC_NR_TIME]; int ret; ret = rx6110_rtc_tm_to_data(tm, data); if (ret < 0) return ret; /* set STOP bit before changing clock/calendar */ ret = regmap_update_bits(rx6110->regmap, RX6110_REG_CTRL, RX6110_BIT_CTRL_STOP, RX6110_BIT_CTRL_STOP); if (ret) return ret; ret = regmap_bulk_write(rx6110->regmap, RX6110_REG_SEC, data, RTC_NR_TIME); if (ret) return ret; /* The time in the RTC is valid. Be sure to have VLF cleared. */ ret = regmap_update_bits(rx6110->regmap, RX6110_REG_FLAG, RX6110_BIT_FLAG_VLF, 0); if (ret) return ret; /* clear STOP bit after changing clock/calendar */ ret = regmap_update_bits(rx6110->regmap, RX6110_REG_CTRL, RX6110_BIT_CTRL_STOP, 0); return ret; } /** * rx6110_get_time - get the current time from the rx6110 registers * @dev: the rtc device in use * @tm: holds date and time */ static int rx6110_get_time(struct device *dev, struct rtc_time *tm) { struct rx6110_data *rx6110 = dev_get_drvdata(dev); u8 data[RTC_NR_TIME]; int flags; int ret; ret = regmap_read(rx6110->regmap, RX6110_REG_FLAG, &flags); if (ret) return -EINVAL; /* check for VLF Flag (set at power-on) */ if ((flags & RX6110_BIT_FLAG_VLF)) { dev_warn(dev, "Voltage low, data is invalid.\n"); return -EINVAL; } /* read registers to date */ ret = regmap_bulk_read(rx6110->regmap, RX6110_REG_SEC, data, RTC_NR_TIME); if (ret) return ret; ret = rx6110_data_to_rtc_tm(data, tm); if (ret) return ret; dev_dbg(dev, "%s: date %ptRr\n", __func__, tm); return 0; } static const struct reg_sequence rx6110_default_regs[] = { { RX6110_REG_RES1, 0xB8 }, { RX6110_REG_RES2, 0x00 }, { RX6110_REG_RES3, 0x10 }, { RX6110_REG_IRQ, 0x00 }, { RX6110_REG_ALMIN, 0x00 }, { RX6110_REG_ALHOUR, 0x00 }, { RX6110_REG_ALWDAY, 0x00 }, }; /** * rx6110_init - initialize the rx6110 registers * * @rx6110: pointer to the rx6110 struct in use * */ static int rx6110_init(struct rx6110_data *rx6110) { struct rtc_device *rtc = rx6110->rtc; int flags; int ret; ret = regmap_update_bits(rx6110->regmap, RX6110_REG_EXT, RX6110_BIT_EXT_TE, 0); if (ret) return ret; ret = regmap_register_patch(rx6110->regmap, rx6110_default_regs, ARRAY_SIZE(rx6110_default_regs)); if (ret) return ret; ret = regmap_read(rx6110->regmap, RX6110_REG_FLAG, &flags); if (ret) return ret; /* check for VLF Flag (set at power-on) */ if ((flags & RX6110_BIT_FLAG_VLF)) dev_warn(&rtc->dev, "Voltage low, data loss detected.\n"); /* check for Alarm Flag */ if (flags & RX6110_BIT_FLAG_AF) dev_warn(&rtc->dev, "An alarm may have been missed.\n"); /* check for Periodic Timer Flag */ if (flags & RX6110_BIT_FLAG_TF) dev_warn(&rtc->dev, "Periodic timer was detected\n"); /* check for Update Timer Flag */ if (flags & RX6110_BIT_FLAG_UF) dev_warn(&rtc->dev, "Update timer was detected\n"); /* clear all flags BUT VLF */ ret = regmap_update_bits(rx6110->regmap, RX6110_REG_FLAG, RX6110_BIT_FLAG_AF | RX6110_BIT_FLAG_UF | RX6110_BIT_FLAG_TF, 0); return ret; } static const struct rtc_class_ops rx6110_rtc_ops = { .read_time = rx6110_get_time, .set_time = rx6110_set_time, }; static int rx6110_probe(struct rx6110_data *rx6110, struct device *dev) { int err; rx6110->rtc = devm_rtc_device_register(dev, RX6110_DRIVER_NAME, &rx6110_rtc_ops, THIS_MODULE); if (IS_ERR(rx6110->rtc)) return PTR_ERR(rx6110->rtc); err = rx6110_init(rx6110); if (err) return err; return 0; } #if IS_ENABLED(CONFIG_SPI_MASTER) static const struct regmap_config regmap_spi_config = { .reg_bits = 8, .val_bits = 8, .max_register = RX6110_REG_IRQ, .read_flag_mask = 0x80, }; /** * rx6110_spi_probe - initialize rtc driver * @spi: pointer to spi device */ static int rx6110_spi_probe(struct spi_device *spi) { struct rx6110_data *rx6110; if ((spi->bits_per_word && spi->bits_per_word != 8) || (spi->max_speed_hz > 2000000) || (spi->mode != (SPI_CS_HIGH | SPI_CPOL | SPI_CPHA))) { dev_warn(&spi->dev, "SPI settings: bits_per_word: %d, max_speed_hz: %d, mode: %xh\n", spi->bits_per_word, spi->max_speed_hz, spi->mode); dev_warn(&spi->dev, "driving device in an unsupported mode"); } rx6110 = devm_kzalloc(&spi->dev, sizeof(*rx6110), GFP_KERNEL); if (!rx6110) return -ENOMEM; rx6110->regmap = devm_regmap_init_spi(spi, ®map_spi_config); if (IS_ERR(rx6110->regmap)) { dev_err(&spi->dev, "regmap init failed for rtc rx6110\n"); return PTR_ERR(rx6110->regmap); } spi_set_drvdata(spi, rx6110); return rx6110_probe(rx6110, &spi->dev); } static const struct spi_device_id rx6110_spi_id[] = { { "rx6110", 0 }, { } }; MODULE_DEVICE_TABLE(spi, rx6110_spi_id); static const __maybe_unused struct of_device_id rx6110_spi_of_match[] = { { .compatible = "epson,rx6110" }, { }, }; MODULE_DEVICE_TABLE(of, rx6110_spi_of_match); static struct spi_driver rx6110_spi_driver = { .driver = { .name = RX6110_DRIVER_NAME, .of_match_table = of_match_ptr(rx6110_spi_of_match), }, .probe = rx6110_spi_probe, .id_table = rx6110_spi_id, }; static int rx6110_spi_register(void) { return spi_register_driver(&rx6110_spi_driver); } static void rx6110_spi_unregister(void) { spi_unregister_driver(&rx6110_spi_driver); } #else static int rx6110_spi_register(void) { return 0; } static void rx6110_spi_unregister(void) { } #endif /* CONFIG_SPI_MASTER */ #if IS_ENABLED(CONFIG_I2C) static const struct regmap_config regmap_i2c_config = { .reg_bits = 8, .val_bits = 8, .max_register = RX6110_REG_IRQ, .read_flag_mask = 0x80, }; static int rx6110_i2c_probe(struct i2c_client *client) { struct i2c_adapter *adapter = client->adapter; struct rx6110_data *rx6110; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK)) { dev_err(&adapter->dev, "doesn't support required functionality\n"); return -EIO; } rx6110 = devm_kzalloc(&client->dev, sizeof(*rx6110), GFP_KERNEL); if (!rx6110) return -ENOMEM; rx6110->regmap = devm_regmap_init_i2c(client, ®map_i2c_config); if (IS_ERR(rx6110->regmap)) { dev_err(&client->dev, "regmap init failed for rtc rx6110\n"); return PTR_ERR(rx6110->regmap); } i2c_set_clientdata(client, rx6110); return rx6110_probe(rx6110, &client->dev); } static const struct acpi_device_id rx6110_i2c_acpi_match[] = { { "SECC6110" }, { } }; MODULE_DEVICE_TABLE(acpi, rx6110_i2c_acpi_match); static const struct i2c_device_id rx6110_i2c_id[] = { { .name = "rx6110" }, { } }; MODULE_DEVICE_TABLE(i2c, rx6110_i2c_id); static struct i2c_driver rx6110_i2c_driver = { .driver = { .name = RX6110_DRIVER_NAME, .acpi_match_table = rx6110_i2c_acpi_match, }, .probe = rx6110_i2c_probe, .id_table = rx6110_i2c_id, }; static int rx6110_i2c_register(void) { return i2c_add_driver(&rx6110_i2c_driver); } static void rx6110_i2c_unregister(void) { i2c_del_driver(&rx6110_i2c_driver); } #else static int rx6110_i2c_register(void) { return 0; } static void rx6110_i2c_unregister(void) { } #endif /* CONFIG_I2C */ static int __init rx6110_module_init(void) { int ret; ret = rx6110_spi_register(); if (ret) return ret; ret = rx6110_i2c_register(); if (ret) rx6110_spi_unregister(); return ret; } module_init(rx6110_module_init);