// SPDX-License-Identifier: GPL-2.0-only/* * Driver for Epson's RTC module RX-8025 SA/NB * * Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.com> * * Copyright (C) 2005 by Digi International Inc. * All rights reserved. * * Modified by fengjh at rising.com.cn * <lm-sensors@lm-sensors.org> * 2006.11 * * Code cleanup by Sergei Poselenov, <sposelenov@emcraft.com> * Converted to new style by Wolfgang Grandegger <wg@grandegger.com> * Alarm and periodic interrupt added by Dmitry Rakhchev <rda@emcraft.com> */#include <linux/bcd.h>#include <linux/bitops.h>#include <linux/i2c.h>#include <linux/kernel.h>#include <linux/kstrtox.h>#include <linux/module.h>#include <linux/rtc.h> /* Register definitions */#define RX8025_REG_SEC 0x00#define RX8025_REG_MIN 0x01#define RX8025_REG_HOUR 0x02#define RX8025_REG_WDAY 0x03#define RX8025_REG_MDAY 0x04#define RX8025_REG_MONTH 0x05#define RX8025_REG_YEAR 0x06#define RX8025_REG_DIGOFF 0x07#define RX8025_REG_ALWMIN 0x08#define RX8025_REG_ALWHOUR 0x09#define RX8025_REG_ALWWDAY 0x0a#define RX8025_REG_ALDMIN 0x0b#define RX8025_REG_ALDHOUR 0x0c/* 0x0d is reserved */#define RX8025_REG_CTRL1 0x0e#define RX8025_REG_CTRL2 0x0f #define RX8025_BIT_CTRL1_CT (7 << 0)/* 1 Hz periodic level irq */#define RX8025_BIT_CTRL1_CT_1HZ 4#define RX8025_BIT_CTRL1_TEST BIT(3)#define RX8025_BIT_CTRL1_1224 BIT(5)#define RX8025_BIT_CTRL1_DALE BIT(6)#define RX8025_BIT_CTRL1_WALE BIT(7) #define RX8025_BIT_CTRL2_DAFG BIT(0)#define RX8025_BIT_CTRL2_WAFG BIT(1)#define RX8025_BIT_CTRL2_CTFG BIT(2)#define RX8025_BIT_CTRL2_PON BIT(4)#define RX8025_BIT_CTRL2_XST BIT(5)#define RX8025_BIT_CTRL2_VDET BIT(6) #define RX8035_BIT_HOUR_1224 BIT(7) /* Clock precision adjustment */#define RX8025_ADJ_RESOLUTION 3050 /* in ppb */#define RX8025_ADJ_DATA_MAX 62#define RX8025_ADJ_DATA_MIN -62 enum rx_model { model_rx_unknown, model_rx_8025, model_rx_8035, model_last}; static const struct i2c_device_id rx8025_id[] = { { .name = "rx8025", .driver_data = model_rx_8025 }, { .name = "rx8035", .driver_data = model_rx_8035 }, { }};MODULE_DEVICE_TABLE(i2c, rx8025_id); struct rx8025_data { struct rtc_device *rtc; enum rx_model model; u8 ctrl1; int is_24;}; static s32 rx8025_read_reg(const struct i2c_client *client, u8 number){ return i2c_smbus_read_byte_data(client, number << 4);} static int rx8025_read_regs(const struct i2c_client *client, u8 number, u8 length, u8 *values){ int ret = i2c_smbus_read_i2c_block_data(client, number << 4, length, values); if (ret != length) return ret < 0 ? ret : -EIO; return 0;} static s32 rx8025_write_reg(const struct i2c_client *client, u8 number, u8 value){ return i2c_smbus_write_byte_data(client, number << 4, value);} static s32 rx8025_write_regs(const struct i2c_client *client, u8 number, u8 length, const u8 *values){ return i2c_smbus_write_i2c_block_data(client, number << 4, length, values);} static int rx8025_is_osc_stopped(enum rx_model model, int ctrl2){ int xstp = ctrl2 & RX8025_BIT_CTRL2_XST; /* XSTP bit has different polarity on RX-8025 vs RX-8035. * RX-8025: 0 == oscillator stopped * RX-8035: 1 == oscillator stopped */ if (model == model_rx_8025) xstp = !xstp; return xstp;} static int rx8025_check_validity(struct device *dev){ struct i2c_client *client = to_i2c_client(dev); struct rx8025_data *drvdata = dev_get_drvdata(dev); int ctrl2; int xstp; ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2); if (ctrl2 < 0) return ctrl2; if (ctrl2 & RX8025_BIT_CTRL2_VDET) dev_warn(dev, "power voltage drop detected\n"); if (ctrl2 & RX8025_BIT_CTRL2_PON) { dev_warn(dev, "power-on reset detected, date is invalid\n"); return -EINVAL; } xstp = rx8025_is_osc_stopped(drvdata->model, ctrl2); if (xstp) { dev_warn(dev, "crystal stopped, date is invalid\n"); return -EINVAL; } return 0;} static int rx8025_reset_validity(struct i2c_client *client){ struct rx8025_data *drvdata = i2c_get_clientdata(client); int ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2); if (ctrl2 < 0) return ctrl2; ctrl2 &= ~(RX8025_BIT_CTRL2_PON | RX8025_BIT_CTRL2_VDET); if (drvdata->model == model_rx_8025) ctrl2 |= RX8025_BIT_CTRL2_XST; else ctrl2 &= ~(RX8025_BIT_CTRL2_XST); return rx8025_write_reg(client, RX8025_REG_CTRL2, ctrl2);} static irqreturn_t rx8025_handle_irq(int irq, void *dev_id){ struct i2c_client *client = dev_id; struct rx8025_data *rx8025 = i2c_get_clientdata(client); int status, xstp; rtc_lock(rx8025->rtc); status = rx8025_read_reg(client, RX8025_REG_CTRL2); if (status < 0) goto out; xstp = rx8025_is_osc_stopped(rx8025->model, status); if (xstp) dev_warn(&client->dev, "Oscillation stop was detected," "you may have to readjust the clock\n"); if (status & RX8025_BIT_CTRL2_CTFG) { /* periodic */ status &= ~RX8025_BIT_CTRL2_CTFG; rtc_update_irq(rx8025->rtc, 1, RTC_PF | RTC_IRQF); } if (status & RX8025_BIT_CTRL2_DAFG) { /* alarm */ status &= RX8025_BIT_CTRL2_DAFG; if (rx8025_write_reg(client, RX8025_REG_CTRL1, rx8025->ctrl1 & ~RX8025_BIT_CTRL1_DALE)) goto out; rtc_update_irq(rx8025->rtc, 1, RTC_AF | RTC_IRQF); } out: rtc_unlock(rx8025->rtc); return IRQ_HANDLED;} static int rx8025_get_time(struct device *dev, struct rtc_time *dt){ struct i2c_client *client = to_i2c_client(dev); struct rx8025_data *rx8025 = dev_get_drvdata(dev); u8 date[7]; int err; err = rx8025_check_validity(dev); if (err) return err; err = rx8025_read_regs(client, RX8025_REG_SEC, 7, date); if (err) return err; dev_dbg(dev, "%s: read %7ph\n", __func__, date); dt->tm_sec = bcd2bin(date[RX8025_REG_SEC] & 0x7f); dt->tm_min = bcd2bin(date[RX8025_REG_MIN] & 0x7f); if (rx8025->is_24) dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x3f); else dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x1f) % 12 + (date[RX8025_REG_HOUR] & 0x20 ? 12 : 0); dt->tm_mday = bcd2bin(date[RX8025_REG_MDAY] & 0x3f); dt->tm_mon = bcd2bin(date[RX8025_REG_MONTH] & 0x1f) - 1; dt->tm_year = bcd2bin(date[RX8025_REG_YEAR]) + 100; dev_dbg(dev, "%s: date %ptRr\n", __func__, dt); return 0;} static int rx8025_set_time(struct device *dev, struct rtc_time *dt){ struct i2c_client *client = to_i2c_client(dev); struct rx8025_data *rx8025 = dev_get_drvdata(dev); u8 date[7]; int ret; /* * Here the read-only bits are written as "0". I'm not sure if that * is sound. */ date[RX8025_REG_SEC] = bin2bcd(dt->tm_sec); date[RX8025_REG_MIN] = bin2bcd(dt->tm_min); if (rx8025->is_24) date[RX8025_REG_HOUR] = bin2bcd(dt->tm_hour); else date[RX8025_REG_HOUR] = (dt->tm_hour >= 12 ? 0x20 : 0) | bin2bcd((dt->tm_hour + 11) % 12 + 1); date[RX8025_REG_WDAY] = bin2bcd(dt->tm_wday); date[RX8025_REG_MDAY] = bin2bcd(dt->tm_mday); date[RX8025_REG_MONTH] = bin2bcd(dt->tm_mon + 1); date[RX8025_REG_YEAR] = bin2bcd(dt->tm_year - 100); dev_dbg(dev, "%s: write %7ph\n", __func__, date); ret = rx8025_write_regs(client, RX8025_REG_SEC, 7, date); if (ret < 0) return ret; return rx8025_reset_validity(client);} static int rx8025_init_client(struct i2c_client *client){ struct rx8025_data *rx8025 = i2c_get_clientdata(client); u8 ctrl[2], ctrl2; int need_clear = 0; int hour_reg; int err; err = rx8025_read_regs(client, RX8025_REG_CTRL1, 2, ctrl); if (err) goto out; /* Keep test bit zero ! */ rx8025->ctrl1 = ctrl[0] & ~RX8025_BIT_CTRL1_TEST; if (ctrl[1] & (RX8025_BIT_CTRL2_DAFG | RX8025_BIT_CTRL2_WAFG)) { dev_warn(&client->dev, "Alarm was detected\n"); need_clear = 1; } if (ctrl[1] & RX8025_BIT_CTRL2_CTFG) need_clear = 1; if (need_clear) { ctrl2 = ctrl[1]; ctrl2 &= ~(RX8025_BIT_CTRL2_CTFG | RX8025_BIT_CTRL2_WAFG | RX8025_BIT_CTRL2_DAFG); err = rx8025_write_reg(client, RX8025_REG_CTRL2, ctrl2); } if (rx8025->model == model_rx_8035) { /* In RX-8035, 12/24 flag is in the hour register */ hour_reg = rx8025_read_reg(client, RX8025_REG_HOUR); if (hour_reg < 0) return hour_reg; rx8025->is_24 = (hour_reg & RX8035_BIT_HOUR_1224); } else { rx8025->is_24 = (ctrl[0] & RX8025_BIT_CTRL1_1224); }out: return err;} /* Alarm support */static int rx8025_read_alarm(struct device *dev, struct rtc_wkalrm *t){ struct i2c_client *client = to_i2c_client(dev); struct rx8025_data *rx8025 = dev_get_drvdata(dev); u8 ald[2]; int ctrl2, err; err = rx8025_read_regs(client, RX8025_REG_ALDMIN, 2, ald); if (err) return err; ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2); if (ctrl2 < 0) return ctrl2; dev_dbg(dev, "%s: read alarm 0x%02x 0x%02x ctrl2 %02x\n", __func__, ald[0], ald[1], ctrl2); /* Hardware alarms precision is 1 minute! */ t->time.tm_sec = 0; t->time.tm_min = bcd2bin(ald[0] & 0x7f); if (rx8025->is_24) t->time.tm_hour = bcd2bin(ald[1] & 0x3f); else t->time.tm_hour = bcd2bin(ald[1] & 0x1f) % 12 + (ald[1] & 0x20 ? 12 : 0); dev_dbg(dev, "%s: date: %ptRr\n", __func__, &t->time); t->enabled = !!(rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE); t->pending = (ctrl2 & RX8025_BIT_CTRL2_DAFG) && t->enabled; return err;} static int rx8025_set_alarm(struct device *dev, struct rtc_wkalrm *t){ struct i2c_client *client = to_i2c_client(dev); struct rx8025_data *rx8025 = dev_get_drvdata(dev); u8 ald[2]; int err; ald[0] = bin2bcd(t->time.tm_min); if (rx8025->is_24) ald[1] = bin2bcd(t->time.tm_hour); else ald[1] = (t->time.tm_hour >= 12 ? 0x20 : 0) | bin2bcd((t->time.tm_hour + 11) % 12 + 1); dev_dbg(dev, "%s: write 0x%02x 0x%02x\n", __func__, ald[0], ald[1]); if (rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE) { rx8025->ctrl1 &= ~RX8025_BIT_CTRL1_DALE; err = rx8025_write_reg(client, RX8025_REG_CTRL1, rx8025->ctrl1); if (err) return err; } err = rx8025_write_regs(client, RX8025_REG_ALDMIN, 2, ald); if (err) return err; if (t->enabled) { rx8025->ctrl1 |= RX8025_BIT_CTRL1_DALE; err = rx8025_write_reg(client, RX8025_REG_CTRL1, rx8025->ctrl1); if (err) return err; } return 0;} static int rx8025_alarm_irq_enable(struct device *dev, unsigned int enabled){ struct i2c_client *client = to_i2c_client(dev); struct rx8025_data *rx8025 = dev_get_drvdata(dev); u8 ctrl1; int err; ctrl1 = rx8025->ctrl1; if (enabled) ctrl1 |= RX8025_BIT_CTRL1_DALE; else ctrl1 &= ~RX8025_BIT_CTRL1_DALE; if (ctrl1 != rx8025->ctrl1) { rx8025->ctrl1 = ctrl1; err = rx8025_write_reg(client, RX8025_REG_CTRL1, rx8025->ctrl1); if (err) return err; } return 0;} /* * According to the RX8025 SA/NB application manual the frequency and * temperature characteristics can be approximated using the following * equation: * * df = a * (ut - t)**2 * * df: Frequency deviation in any temperature * a : Coefficient = (-35 +-5) * 10**-9 * ut: Ultimate temperature in degree = +25 +-5 degree * t : Any temperature in degree */static int rx8025_read_offset(struct device *dev, long *offset){ struct i2c_client *client = to_i2c_client(dev); int digoff; digoff = rx8025_read_reg(client, RX8025_REG_DIGOFF); if (digoff < 0) return digoff; *offset = digoff >= 64 ? digoff - 128 : digoff; if (*offset > 0) (*offset)--; *offset *= RX8025_ADJ_RESOLUTION; return 0;} static int rx8025_set_offset(struct device *dev, long offset){ struct i2c_client *client = to_i2c_client(dev); u8 digoff; offset /= RX8025_ADJ_RESOLUTION; if (offset > RX8025_ADJ_DATA_MAX) offset = RX8025_ADJ_DATA_MAX; else if (offset < RX8025_ADJ_DATA_MIN) offset = RX8025_ADJ_DATA_MIN; else if (offset > 0) offset++; else if (offset < 0) offset += 128; digoff = offset; return rx8025_write_reg(client, RX8025_REG_DIGOFF, digoff);} static const struct rtc_class_ops rx8025_rtc_ops = { .read_time = rx8025_get_time, .set_time = rx8025_set_time, .read_alarm = rx8025_read_alarm, .set_alarm = rx8025_set_alarm, .alarm_irq_enable = rx8025_alarm_irq_enable, .read_offset = rx8025_read_offset, .set_offset = rx8025_set_offset,}; static ssize_t rx8025_sysfs_show_clock_adjust(struct device *dev, struct device_attribute *attr, char *buf){ long adj; int err; dev_warn_once(dev, "clock_adjust_ppb is deprecated, use offset\n"); err = rx8025_read_offset(dev, &adj); if (err) return err; return sprintf(buf, "%ld\n", -adj);} static ssize_t rx8025_sysfs_store_clock_adjust(struct device *dev, struct device_attribute *attr, const char *buf, size_t count){ long adj; int err; Lines 1–500 of 588. 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// SPDX-License-Identifier: GPL-2.0-only /* * Driver for Epson's RTC module RX-8025 SA/NB * * Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.com> * * Copyright (C) 2005 by Digi International Inc. * All rights reserved. * * Modified by fengjh at rising.com.cn * <lm-sensors@lm-sensors.org> * 2006.11 * * Code cleanup by Sergei Poselenov, <sposelenov@emcraft.com> * Converted to new style by Wolfgang Grandegger <wg@grandegger.com> * Alarm and periodic interrupt added by Dmitry Rakhchev <rda@emcraft.com> */ #include <linux/bcd.h> #include <linux/bitops.h> #include <linux/i2c.h> #include <linux/kernel.h> #include <linux/kstrtox.h> #include <linux/module.h> #include <linux/rtc.h> /* Register definitions */ #define RX8025_REG_SEC 0x00 #define RX8025_REG_MIN 0x01 #define RX8025_REG_HOUR 0x02 #define RX8025_REG_WDAY 0x03 #define RX8025_REG_MDAY 0x04 #define RX8025_REG_MONTH 0x05 #define RX8025_REG_YEAR 0x06 #define RX8025_REG_DIGOFF 0x07 #define RX8025_REG_ALWMIN 0x08 #define RX8025_REG_ALWHOUR 0x09 #define RX8025_REG_ALWWDAY 0x0a #define RX8025_REG_ALDMIN 0x0b #define RX8025_REG_ALDHOUR 0x0c /* 0x0d is reserved */ #define RX8025_REG_CTRL1 0x0e #define RX8025_REG_CTRL2 0x0f #define RX8025_BIT_CTRL1_CT (7 << 0) /* 1 Hz periodic level irq */ #define RX8025_BIT_CTRL1_CT_1HZ 4 #define RX8025_BIT_CTRL1_TEST BIT(3) #define RX8025_BIT_CTRL1_1224 BIT(5) #define RX8025_BIT_CTRL1_DALE BIT(6) #define RX8025_BIT_CTRL1_WALE BIT(7) #define RX8025_BIT_CTRL2_DAFG BIT(0) #define RX8025_BIT_CTRL2_WAFG BIT(1) #define RX8025_BIT_CTRL2_CTFG BIT(2) #define RX8025_BIT_CTRL2_PON BIT(4) #define RX8025_BIT_CTRL2_XST BIT(5) #define RX8025_BIT_CTRL2_VDET BIT(6) #define RX8035_BIT_HOUR_1224 BIT(7) /* Clock precision adjustment */ #define RX8025_ADJ_RESOLUTION 3050 /* in ppb */ #define RX8025_ADJ_DATA_MAX 62 #define RX8025_ADJ_DATA_MIN -62 enum rx_model { model_rx_unknown, model_rx_8025, model_rx_8035, model_last }; static const struct i2c_device_id rx8025_id[] = { { .name = "rx8025", .driver_data = model_rx_8025 }, { .name = "rx8035", .driver_data = model_rx_8035 }, { } }; MODULE_DEVICE_TABLE(i2c, rx8025_id); struct rx8025_data { struct rtc_device *rtc; enum rx_model model; u8 ctrl1; int is_24; }; static s32 rx8025_read_reg(const struct i2c_client *client, u8 number) { return i2c_smbus_read_byte_data(client, number << 4); } static int rx8025_read_regs(const struct i2c_client *client, u8 number, u8 length, u8 *values) { int ret = i2c_smbus_read_i2c_block_data(client, number << 4, length, values); if (ret != length) return ret < 0 ? ret : -EIO; return 0; } static s32 rx8025_write_reg(const struct i2c_client *client, u8 number, u8 value) { return i2c_smbus_write_byte_data(client, number << 4, value); } static s32 rx8025_write_regs(const struct i2c_client *client, u8 number, u8 length, const u8 *values) { return i2c_smbus_write_i2c_block_data(client, number << 4, length, values); } static int rx8025_is_osc_stopped(enum rx_model model, int ctrl2) { int xstp = ctrl2 & RX8025_BIT_CTRL2_XST; /* XSTP bit has different polarity on RX-8025 vs RX-8035. * RX-8025: 0 == oscillator stopped * RX-8035: 1 == oscillator stopped */ if (model == model_rx_8025) xstp = !xstp; return xstp; } static int rx8025_check_validity(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct rx8025_data *drvdata = dev_get_drvdata(dev); int ctrl2; int xstp; ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2); if (ctrl2 < 0) return ctrl2; if (ctrl2 & RX8025_BIT_CTRL2_VDET) dev_warn(dev, "power voltage drop detected\n"); if (ctrl2 & RX8025_BIT_CTRL2_PON) { dev_warn(dev, "power-on reset detected, date is invalid\n"); return -EINVAL; } xstp = rx8025_is_osc_stopped(drvdata->model, ctrl2); if (xstp) { dev_warn(dev, "crystal stopped, date is invalid\n"); return -EINVAL; } return 0; } static int rx8025_reset_validity(struct i2c_client *client) { struct rx8025_data *drvdata = i2c_get_clientdata(client); int ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2); if (ctrl2 < 0) return ctrl2; ctrl2 &= ~(RX8025_BIT_CTRL2_PON | RX8025_BIT_CTRL2_VDET); if (drvdata->model == model_rx_8025) ctrl2 |= RX8025_BIT_CTRL2_XST; else ctrl2 &= ~(RX8025_BIT_CTRL2_XST); return rx8025_write_reg(client, RX8025_REG_CTRL2, ctrl2); } static irqreturn_t rx8025_handle_irq(int irq, void *dev_id) { struct i2c_client *client = dev_id; struct rx8025_data *rx8025 = i2c_get_clientdata(client); int status, xstp; rtc_lock(rx8025->rtc); status = rx8025_read_reg(client, RX8025_REG_CTRL2); if (status < 0) goto out; xstp = rx8025_is_osc_stopped(rx8025->model, status); if (xstp) dev_warn(&client->dev, "Oscillation stop was detected," "you may have to readjust the clock\n"); if (status & RX8025_BIT_CTRL2_CTFG) { /* periodic */ status &= ~RX8025_BIT_CTRL2_CTFG; rtc_update_irq(rx8025->rtc, 1, RTC_PF | RTC_IRQF); } if (status & RX8025_BIT_CTRL2_DAFG) { /* alarm */ status &= RX8025_BIT_CTRL2_DAFG; if (rx8025_write_reg(client, RX8025_REG_CTRL1, rx8025->ctrl1 & ~RX8025_BIT_CTRL1_DALE)) goto out; rtc_update_irq(rx8025->rtc, 1, RTC_AF | RTC_IRQF); } out: rtc_unlock(rx8025->rtc); return IRQ_HANDLED; } static int rx8025_get_time(struct device *dev, struct rtc_time *dt) { struct i2c_client *client = to_i2c_client(dev); struct rx8025_data *rx8025 = dev_get_drvdata(dev); u8 date[7]; int err; err = rx8025_check_validity(dev); if (err) return err; err = rx8025_read_regs(client, RX8025_REG_SEC, 7, date); if (err) return err; dev_dbg(dev, "%s: read %7ph\n", __func__, date); dt->tm_sec = bcd2bin(date[RX8025_REG_SEC] & 0x7f); dt->tm_min = bcd2bin(date[RX8025_REG_MIN] & 0x7f); if (rx8025->is_24) dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x3f); else dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x1f) % 12 + (date[RX8025_REG_HOUR] & 0x20 ? 12 : 0); dt->tm_mday = bcd2bin(date[RX8025_REG_MDAY] & 0x3f); dt->tm_mon = bcd2bin(date[RX8025_REG_MONTH] & 0x1f) - 1; dt->tm_year = bcd2bin(date[RX8025_REG_YEAR]) + 100; dev_dbg(dev, "%s: date %ptRr\n", __func__, dt); return 0; } static int rx8025_set_time(struct device *dev, struct rtc_time *dt) { struct i2c_client *client = to_i2c_client(dev); struct rx8025_data *rx8025 = dev_get_drvdata(dev); u8 date[7]; int ret; /* * Here the read-only bits are written as "0". I'm not sure if that * is sound. */ date[RX8025_REG_SEC] = bin2bcd(dt->tm_sec); date[RX8025_REG_MIN] = bin2bcd(dt->tm_min); if (rx8025->is_24) date[RX8025_REG_HOUR] = bin2bcd(dt->tm_hour); else date[RX8025_REG_HOUR] = (dt->tm_hour >= 12 ? 0x20 : 0) | bin2bcd((dt->tm_hour + 11) % 12 + 1); date[RX8025_REG_WDAY] = bin2bcd(dt->tm_wday); date[RX8025_REG_MDAY] = bin2bcd(dt->tm_mday); date[RX8025_REG_MONTH] = bin2bcd(dt->tm_mon + 1); date[RX8025_REG_YEAR] = bin2bcd(dt->tm_year - 100); dev_dbg(dev, "%s: write %7ph\n", __func__, date); ret = rx8025_write_regs(client, RX8025_REG_SEC, 7, date); if (ret < 0) return ret; return rx8025_reset_validity(client); } static int rx8025_init_client(struct i2c_client *client) { struct rx8025_data *rx8025 = i2c_get_clientdata(client); u8 ctrl[2], ctrl2; int need_clear = 0; int hour_reg; int err; err = rx8025_read_regs(client, RX8025_REG_CTRL1, 2, ctrl); if (err) goto out; /* Keep test bit zero ! */ rx8025->ctrl1 = ctrl[0] & ~RX8025_BIT_CTRL1_TEST; if (ctrl[1] & (RX8025_BIT_CTRL2_DAFG | RX8025_BIT_CTRL2_WAFG)) { dev_warn(&client->dev, "Alarm was detected\n"); need_clear = 1; } if (ctrl[1] & RX8025_BIT_CTRL2_CTFG) need_clear = 1; if (need_clear) { ctrl2 = ctrl[1]; ctrl2 &= ~(RX8025_BIT_CTRL2_CTFG | RX8025_BIT_CTRL2_WAFG | RX8025_BIT_CTRL2_DAFG); err = rx8025_write_reg(client, RX8025_REG_CTRL2, ctrl2); } if (rx8025->model == model_rx_8035) { /* In RX-8035, 12/24 flag is in the hour register */ hour_reg = rx8025_read_reg(client, RX8025_REG_HOUR); if (hour_reg < 0) return hour_reg; rx8025->is_24 = (hour_reg & RX8035_BIT_HOUR_1224); } else { rx8025->is_24 = (ctrl[0] & RX8025_BIT_CTRL1_1224); } out: return err; } /* Alarm support */ static int rx8025_read_alarm(struct device *dev, struct rtc_wkalrm *t) { struct i2c_client *client = to_i2c_client(dev); struct rx8025_data *rx8025 = dev_get_drvdata(dev); u8 ald[2]; int ctrl2, err; err = rx8025_read_regs(client, RX8025_REG_ALDMIN, 2, ald); if (err) return err; ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2); if (ctrl2 < 0) return ctrl2; dev_dbg(dev, "%s: read alarm 0x%02x 0x%02x ctrl2 %02x\n", __func__, ald[0], ald[1], ctrl2); /* Hardware alarms precision is 1 minute! */ t->time.tm_sec = 0; t->time.tm_min = bcd2bin(ald[0] & 0x7f); if (rx8025->is_24) t->time.tm_hour = bcd2bin(ald[1] & 0x3f); else t->time.tm_hour = bcd2bin(ald[1] & 0x1f) % 12 + (ald[1] & 0x20 ? 12 : 0); dev_dbg(dev, "%s: date: %ptRr\n", __func__, &t->time); t->enabled = !!(rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE); t->pending = (ctrl2 & RX8025_BIT_CTRL2_DAFG) && t->enabled; return err; } static int rx8025_set_alarm(struct device *dev, struct rtc_wkalrm *t) { struct i2c_client *client = to_i2c_client(dev); struct rx8025_data *rx8025 = dev_get_drvdata(dev); u8 ald[2]; int err; ald[0] = bin2bcd(t->time.tm_min); if (rx8025->is_24) ald[1] = bin2bcd(t->time.tm_hour); else ald[1] = (t->time.tm_hour >= 12 ? 0x20 : 0) | bin2bcd((t->time.tm_hour + 11) % 12 + 1); dev_dbg(dev, "%s: write 0x%02x 0x%02x\n", __func__, ald[0], ald[1]); if (rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE) { rx8025->ctrl1 &= ~RX8025_BIT_CTRL1_DALE; err = rx8025_write_reg(client, RX8025_REG_CTRL1, rx8025->ctrl1); if (err) return err; } err = rx8025_write_regs(client, RX8025_REG_ALDMIN, 2, ald); if (err) return err; if (t->enabled) { rx8025->ctrl1 |= RX8025_BIT_CTRL1_DALE; err = rx8025_write_reg(client, RX8025_REG_CTRL1, rx8025->ctrl1); if (err) return err; } return 0; } static int rx8025_alarm_irq_enable(struct device *dev, unsigned int enabled) { struct i2c_client *client = to_i2c_client(dev); struct rx8025_data *rx8025 = dev_get_drvdata(dev); u8 ctrl1; int err; ctrl1 = rx8025->ctrl1; if (enabled) ctrl1 |= RX8025_BIT_CTRL1_DALE; else ctrl1 &= ~RX8025_BIT_CTRL1_DALE; if (ctrl1 != rx8025->ctrl1) { rx8025->ctrl1 = ctrl1; err = rx8025_write_reg(client, RX8025_REG_CTRL1, rx8025->ctrl1); if (err) return err; } return 0; } /* * According to the RX8025 SA/NB application manual the frequency and * temperature characteristics can be approximated using the following * equation: * * df = a * (ut - t)**2 * * df: Frequency deviation in any temperature * a : Coefficient = (-35 +-5) * 10**-9 * ut: Ultimate temperature in degree = +25 +-5 degree * t : Any temperature in degree */ static int rx8025_read_offset(struct device *dev, long *offset) { struct i2c_client *client = to_i2c_client(dev); int digoff; digoff = rx8025_read_reg(client, RX8025_REG_DIGOFF); if (digoff < 0) return digoff; *offset = digoff >= 64 ? digoff - 128 : digoff; if (*offset > 0) (*offset)--; *offset *= RX8025_ADJ_RESOLUTION; return 0; } static int rx8025_set_offset(struct device *dev, long offset) { struct i2c_client *client = to_i2c_client(dev); u8 digoff; offset /= RX8025_ADJ_RESOLUTION; if (offset > RX8025_ADJ_DATA_MAX) offset = RX8025_ADJ_DATA_MAX; else if (offset < RX8025_ADJ_DATA_MIN) offset = RX8025_ADJ_DATA_MIN; else if (offset > 0) offset++; else if (offset < 0) offset += 128; digoff = offset; return rx8025_write_reg(client, RX8025_REG_DIGOFF, digoff); } static const struct rtc_class_ops rx8025_rtc_ops = { .read_time = rx8025_get_time, .set_time = rx8025_set_time, .read_alarm = rx8025_read_alarm, .set_alarm = rx8025_set_alarm, .alarm_irq_enable = rx8025_alarm_irq_enable, .read_offset = rx8025_read_offset, .set_offset = rx8025_set_offset, }; static ssize_t rx8025_sysfs_show_clock_adjust(struct device *dev, struct device_attribute *attr, char *buf) { long adj; int err; dev_warn_once(dev, "clock_adjust_ppb is deprecated, use offset\n"); err = rx8025_read_offset(dev, &adj); if (err) return err; return sprintf(buf, "%ld\n", -adj); } static ssize_t rx8025_sysfs_store_clock_adjust(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { long adj; int err;