// SPDX-License-Identifier: GPL-2.0 /* * RTC driver for the Micro Crystal RV3032 * * Copyright (C) 2020 Micro Crystal SA * * Alexandre Belloni * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define RV3032_SEC 0x01 #define RV3032_MIN 0x02 #define RV3032_HOUR 0x03 #define RV3032_WDAY 0x04 #define RV3032_DAY 0x05 #define RV3032_MONTH 0x06 #define RV3032_YEAR 0x07 #define RV3032_ALARM_MIN 0x08 #define RV3032_ALARM_HOUR 0x09 #define RV3032_ALARM_DAY 0x0A #define RV3032_STATUS 0x0D #define RV3032_TLSB 0x0E #define RV3032_TMSB 0x0F #define RV3032_CTRL1 0x10 #define RV3032_CTRL2 0x11 #define RV3032_CTRL3 0x12 #define RV3032_TS_CTRL 0x13 #define RV3032_CLK_IRQ 0x14 #define RV3032_EEPROM_ADDR 0x3D #define RV3032_EEPROM_DATA 0x3E #define RV3032_EEPROM_CMD 0x3F #define RV3032_RAM1 0x40 #define RV3032_PMU 0xC0 #define RV3032_OFFSET 0xC1 #define RV3032_CLKOUT1 0xC2 #define RV3032_CLKOUT2 0xC3 #define RV3032_TREF0 0xC4 #define RV3032_TREF1 0xC5 #define RV3032_STATUS_VLF BIT(0) #define RV3032_STATUS_PORF BIT(1) #define RV3032_STATUS_EVF BIT(2) #define RV3032_STATUS_AF BIT(3) #define RV3032_STATUS_TF BIT(4) #define RV3032_STATUS_UF BIT(5) #define RV3032_STATUS_TLF BIT(6) #define RV3032_STATUS_THF BIT(7) #define RV3032_TLSB_CLKF BIT(1) #define RV3032_TLSB_EEBUSY BIT(2) #define RV3032_TLSB_TEMP GENMASK(7, 4) #define RV3032_CLKOUT2_HFD_MSK GENMASK(4, 0) #define RV3032_CLKOUT2_FD_MSK GENMASK(6, 5) #define RV3032_CLKOUT2_OS BIT(7) #define RV3032_CTRL1_EERD BIT(3) #define RV3032_CTRL1_WADA BIT(5) #define RV3032_CTRL2_STOP BIT(0) #define RV3032_CTRL2_EIE BIT(2) #define RV3032_CTRL2_AIE BIT(3) #define RV3032_CTRL2_TIE BIT(4) #define RV3032_CTRL2_UIE BIT(5) #define RV3032_CTRL2_CLKIE BIT(6) #define RV3032_CTRL2_TSE BIT(7) #define RV3032_PMU_TCM GENMASK(1, 0) #define RV3032_PMU_TCR GENMASK(3, 2) #define RV3032_PMU_BSM GENMASK(5, 4) #define RV3032_PMU_NCLKE BIT(6) #define RV3032_PMU_BSM_DSM 1 #define RV3032_PMU_BSM_LSM 2 #define RV3032_OFFSET_MSK GENMASK(5, 0) #define RV3032_EVT_CTRL_TSR BIT(2) #define RV3032_EEPROM_CMD_UPDATE 0x11 #define RV3032_EEPROM_CMD_WRITE 0x21 #define RV3032_EEPROM_CMD_READ 0x22 #define RV3032_EEPROM_USER 0xCB #define RV3032_EEBUSY_POLL 10000 #define RV3032_EEBUSY_TIMEOUT 100000 #define OFFSET_STEP_PPT 238419 struct rv3032_data { struct regmap *regmap; struct rtc_device *rtc; bool trickle_charger_set; #ifdef CONFIG_COMMON_CLK struct clk_hw clkout_hw; #endif }; static u16 rv3032_trickle_resistors[] = {1000, 2000, 7000, 11000}; static u16 rv3032_trickle_voltages[] = {0, 1750, 3000, 4400}; static int rv3032_exit_eerd(struct rv3032_data *rv3032, u32 eerd) { if (eerd) return 0; return regmap_update_bits(rv3032->regmap, RV3032_CTRL1, RV3032_CTRL1_EERD, 0); } static int rv3032_enter_eerd(struct rv3032_data *rv3032, u32 *eerd) { u32 ctrl1, status; int ret; ret = regmap_read(rv3032->regmap, RV3032_CTRL1, &ctrl1); if (ret) return ret; *eerd = ctrl1 & RV3032_CTRL1_EERD; if (*eerd) return 0; ret = regmap_update_bits(rv3032->regmap, RV3032_CTRL1, RV3032_CTRL1_EERD, RV3032_CTRL1_EERD); if (ret) return ret; ret = regmap_read_poll_timeout(rv3032->regmap, RV3032_TLSB, status, !(status & RV3032_TLSB_EEBUSY), RV3032_EEBUSY_POLL, RV3032_EEBUSY_TIMEOUT); if (ret) { rv3032_exit_eerd(rv3032, *eerd); return ret; } return 0; } static int rv3032_update_cfg(struct rv3032_data *rv3032, unsigned int reg, unsigned int mask, unsigned int val) { u32 status, eerd; int ret; ret = rv3032_enter_eerd(rv3032, &eerd); if (ret) return ret; ret = regmap_update_bits(rv3032->regmap, reg, mask, val); if (ret) goto exit_eerd; ret = regmap_write(rv3032->regmap, RV3032_EEPROM_CMD, RV3032_EEPROM_CMD_UPDATE); if (ret) goto exit_eerd; usleep_range(46000, RV3032_EEBUSY_TIMEOUT); ret = regmap_read_poll_timeout(rv3032->regmap, RV3032_TLSB, status, !(status & RV3032_TLSB_EEBUSY), RV3032_EEBUSY_POLL, RV3032_EEBUSY_TIMEOUT); exit_eerd: rv3032_exit_eerd(rv3032, eerd); return ret; } static irqreturn_t rv3032_handle_irq(int irq, void *dev_id) { struct rv3032_data *rv3032 = dev_id; unsigned long events = 0; u32 status = 0, ctrl = 0; if (regmap_read(rv3032->regmap, RV3032_STATUS, &status) < 0 || status == 0) { return IRQ_NONE; } if (status & RV3032_STATUS_TF) { status |= RV3032_STATUS_TF; ctrl |= RV3032_CTRL2_TIE; events |= RTC_PF; } if (status & RV3032_STATUS_AF) { status |= RV3032_STATUS_AF; ctrl |= RV3032_CTRL2_AIE; events |= RTC_AF; } if (status & RV3032_STATUS_UF) { status |= RV3032_STATUS_UF; ctrl |= RV3032_CTRL2_UIE; events |= RTC_UF; } if (events) { rtc_update_irq(rv3032->rtc, 1, events); regmap_update_bits(rv3032->regmap, RV3032_STATUS, status, 0); regmap_update_bits(rv3032->regmap, RV3032_CTRL2, ctrl, 0); } return IRQ_HANDLED; } static int rv3032_get_time(struct device *dev, struct rtc_time *tm) { struct rv3032_data *rv3032 = dev_get_drvdata(dev); u8 date[7]; int ret, status; ret = regmap_read(rv3032->regmap, RV3032_STATUS, &status); if (ret < 0) return ret; if (status & (RV3032_STATUS_PORF | RV3032_STATUS_VLF)) return -EINVAL; ret = regmap_bulk_read(rv3032->regmap, RV3032_SEC, date, sizeof(date)); if (ret) return ret; tm->tm_sec = bcd2bin(date[0] & 0x7f); tm->tm_min = bcd2bin(date[1] & 0x7f); tm->tm_hour = bcd2bin(date[2] & 0x3f); tm->tm_wday = date[3] & 0x7; tm->tm_mday = bcd2bin(date[4] & 0x3f); tm->tm_mon = bcd2bin(date[5] & 0x1f) - 1; tm->tm_year = bcd2bin(date[6]) + 100; return 0; } static int rv3032_set_time(struct device *dev, struct rtc_time *tm) { struct rv3032_data *rv3032 = dev_get_drvdata(dev); u8 date[7]; int ret; date[0] = bin2bcd(tm->tm_sec); date[1] = bin2bcd(tm->tm_min); date[2] = bin2bcd(tm->tm_hour); date[3] = tm->tm_wday; date[4] = bin2bcd(tm->tm_mday); date[5] = bin2bcd(tm->tm_mon + 1); date[6] = bin2bcd(tm->tm_year - 100); ret = regmap_bulk_write(rv3032->regmap, RV3032_SEC, date, sizeof(date)); if (ret) return ret; ret = regmap_update_bits(rv3032->regmap, RV3032_STATUS, RV3032_STATUS_PORF | RV3032_STATUS_VLF, 0); return ret; } static int rv3032_get_alarm(struct device *dev, struct rtc_wkalrm *alrm) { struct rv3032_data *rv3032 = dev_get_drvdata(dev); u8 alarmvals[3]; int status, ctrl, ret; ret = regmap_bulk_read(rv3032->regmap, RV3032_ALARM_MIN, alarmvals, sizeof(alarmvals)); if (ret) return ret; ret = regmap_read(rv3032->regmap, RV3032_STATUS, &status); if (ret < 0) return ret; ret = regmap_read(rv3032->regmap, RV3032_CTRL2, &ctrl); if (ret < 0) return ret; alrm->time.tm_sec = 0; alrm->time.tm_min = bcd2bin(alarmvals[0] & 0x7f); alrm->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f); alrm->time.tm_mday = bcd2bin(alarmvals[2] & 0x3f); alrm->enabled = !!(ctrl & RV3032_CTRL2_AIE); alrm->pending = (status & RV3032_STATUS_AF) && alrm->enabled; return 0; } static int rv3032_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) { struct rv3032_data *rv3032 = dev_get_drvdata(dev); u8 alarmvals[3]; u8 ctrl = 0; int ret; ret = regmap_update_bits(rv3032->regmap, RV3032_CTRL2, RV3032_CTRL2_AIE | RV3032_CTRL2_UIE, 0); if (ret) return ret; alarmvals[0] = bin2bcd(alrm->time.tm_min); alarmvals[1] = bin2bcd(alrm->time.tm_hour); alarmvals[2] = bin2bcd(alrm->time.tm_mday); ret = regmap_update_bits(rv3032->regmap, RV3032_STATUS, RV3032_STATUS_AF, 0); if (ret) return ret; ret = regmap_bulk_write(rv3032->regmap, RV3032_ALARM_MIN, alarmvals, sizeof(alarmvals)); if (ret) return ret; if (alrm->enabled) { if (rv3032->rtc->uie_rtctimer.enabled) ctrl |= RV3032_CTRL2_UIE; if (rv3032->rtc->aie_timer.enabled) ctrl |= RV3032_CTRL2_AIE; } ret = regmap_update_bits(rv3032->regmap, RV3032_CTRL2, RV3032_CTRL2_UIE | RV3032_CTRL2_AIE, ctrl); return ret; } static int rv3032_alarm_irq_enable(struct device *dev, unsigned int enabled) { struct rv3032_data *rv3032 = dev_get_drvdata(dev); int ctrl = 0, ret; if (enabled) { if (rv3032->rtc->uie_rtctimer.enabled) ctrl |= RV3032_CTRL2_UIE; if (rv3032->rtc->aie_timer.enabled) ctrl |= RV3032_CTRL2_AIE; } ret = regmap_update_bits(rv3032->regmap, RV3032_STATUS, RV3032_STATUS_AF | RV3032_STATUS_UF, 0); if (ret) return ret; ret = regmap_update_bits(rv3032->regmap, RV3032_CTRL2, RV3032_CTRL2_UIE | RV3032_CTRL2_AIE, ctrl); if (ret) return ret; return 0; } static int rv3032_read_offset(struct device *dev, long *offset) { struct rv3032_data *rv3032 = dev_get_drvdata(dev); int ret, value, steps; ret = regmap_read(rv3032->regmap, RV3032_OFFSET, &value); if (ret < 0) return ret; steps = sign_extend32(FIELD_GET(RV3032_OFFSET_MSK, value), 5); *offset = DIV_ROUND_CLOSEST(steps * OFFSET_STEP_PPT, 1000); return 0; } static int rv3032_set_offset(struct device *dev, long offset) { struct rv3032_data *rv3032 = dev_get_drvdata(dev); offset = clamp(offset, -7629L, 7391L) * 1000; offset = DIV_ROUND_CLOSEST(offset, OFFSET_STEP_PPT); return rv3032_update_cfg(rv3032, RV3032_OFFSET, RV3032_OFFSET_MSK, FIELD_PREP(RV3032_OFFSET_MSK, offset)); } static int rv3032_param_get(struct device *dev, struct rtc_param *param) { struct rv3032_data *rv3032 = dev_get_drvdata(dev); int ret; switch(param->param) { u32 value; case RTC_PARAM_BACKUP_SWITCH_MODE: ret = regmap_read(rv3032->regmap, RV3032_PMU, &value); if (ret < 0) return ret; value = FIELD_GET(RV3032_PMU_BSM, value); switch(value) { case RV3032_PMU_BSM_DSM: param->uvalue = RTC_BSM_DIRECT; break; case RV3032_PMU_BSM_LSM: param->uvalue = RTC_BSM_LEVEL; break; default: param->uvalue = RTC_BSM_DISABLED; } break; default: return -EINVAL; } return 0; } static int rv3032_param_set(struct device *dev, struct rtc_param *param) { struct rv3032_data *rv3032 = dev_get_drvdata(dev); switch(param->param) { u8 mode; case RTC_PARAM_BACKUP_SWITCH_MODE: if (rv3032->trickle_charger_set) return -EINVAL; switch (param->uvalue) { case RTC_BSM_DISABLED: mode = 0; break; case RTC_BSM_DIRECT: mode = RV3032_PMU_BSM_DSM; break; case RTC_BSM_LEVEL: mode = RV3032_PMU_BSM_LSM; break; default: return -EINVAL; } return rv3032_update_cfg(rv3032, RV3032_PMU, RV3032_PMU_BSM, FIELD_PREP(RV3032_PMU_BSM, mode)); default: return -EINVAL; } return 0; } static int rv3032_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) { struct rv3032_data *rv3032 = dev_get_drvdata(dev); int status, val = 0, ret = 0; switch (cmd) { case RTC_VL_READ: ret = regmap_read(rv3032->regmap, RV3032_STATUS, &status); if (ret < 0) return ret; if (status & (RV3032_STATUS_PORF | RV3032_STATUS_VLF)) val = RTC_VL_DATA_INVALID; return put_user(val, (unsigned int __user *)arg); default: return -ENOIOCTLCMD; } } static int rv3032_nvram_write(void *priv, unsigned int offset, void *val, size_t bytes) { return regmap_bulk_write(priv, RV3032_RAM1 + offset, val, bytes); } static int rv3032_nvram_read(void *priv, unsigned int offset, void *val, size_t bytes) { return regmap_bulk_read(priv, RV3032_RAM1 + offset, val, bytes); } static int rv3032_eeprom_write(void *priv, unsigned int offset, void *val, size_t bytes) { struct rv3032_data *rv3032 = priv; u32 status, eerd; int i, ret; u8 *buf = val; ret = rv3032_enter_eerd(rv3032, &eerd); if (ret) return ret; for (i = 0; i < bytes; i++) { ret = regmap_write(rv3032->regmap, RV3032_EEPROM_ADDR, RV3032_EEPROM_USER + offset + i); if (ret) goto exit_eerd; ret = regmap_write(rv3032->regmap, RV3032_EEPROM_DATA, buf[i]); if (ret) goto exit_eerd; ret = regmap_write(rv3032->regmap, RV3032_EEPROM_CMD, RV3032_EEPROM_CMD_WRITE); if (ret) goto exit_eerd; usleep_range(RV3032_EEBUSY_POLL, RV3032_EEBUSY_TIMEOUT); ret = regmap_read_poll_timeout(rv3032->regmap, RV3032_TLSB, status, !(status & RV3032_TLSB_EEBUSY), RV3032_EEBUSY_POLL, RV3032_EEBUSY_TIMEOUT); if (ret) goto exit_eerd; } exit_eerd: rv3032_exit_eerd(rv3032, eerd); return ret; } static int rv3032_eeprom_read(void *priv, unsigned int offset, void *val, size_t bytes) { struct rv3032_data *rv3032 = priv; u32 status, eerd, data; int i, ret; u8 *buf = val; ret = rv3032_enter_eerd(rv3032, &eerd); if (ret) return ret; for (i = 0; i < bytes; i++) { ret = regmap_write(rv3032->regmap, RV3032_EEPROM_ADDR, RV3032_EEPROM_USER + offset + i); if (ret) goto exit_eerd; ret = regmap_write(rv3032->regmap, RV3032_EEPROM_CMD, RV3032_EEPROM_CMD_READ); if (ret) goto exit_eerd; ret = regmap_read_poll_timeout(rv3032->regmap, RV3032_TLSB, status, !(status & RV3032_TLSB_EEBUSY), RV3032_EEBUSY_POLL, RV3032_EEBUSY_TIMEOUT); if (ret) goto exit_eerd; ret = regmap_read(rv3032->regmap, RV3032_EEPROM_DATA, &data); if (ret) goto exit_eerd; buf[i] = data; } exit_eerd: rv3032_exit_eerd(rv3032, eerd); return ret; } static int rv3032_trickle_charger_setup(struct device *dev, struct rv3032_data *rv3032) { u32 val, ohms, voltage; int i; val = FIELD_PREP(RV3032_PMU_TCM, 1) | FIELD_PREP(RV3032_PMU_BSM, RV3032_PMU_BSM_DSM); if (!device_property_read_u32(dev, "trickle-voltage-millivolt", &voltage)) { for (i = 0; i < ARRAY_SIZE(rv3032_trickle_voltages); i++) if (voltage == rv3032_trickle_voltages[i]) break; if (i < ARRAY_SIZE(rv3032_trickle_voltages)) val = FIELD_PREP(RV3032_PMU_TCM, i) | FIELD_PREP(RV3032_PMU_BSM, RV3032_PMU_BSM_LSM); } if (device_property_read_u32(dev, "trickle-resistor-ohms", &ohms)) return 0; for (i = 0; i < ARRAY_SIZE(rv3032_trickle_resistors); i++) if (ohms == rv3032_trickle_resistors[i]) break; if (i >= ARRAY_SIZE(rv3032_trickle_resistors)) { dev_warn(dev, "invalid trickle resistor value\n"); return 0; } rv3032->trickle_charger_set = true; return rv3032_update_cfg(rv3032, RV3032_PMU, RV3032_PMU_TCR | RV3032_PMU_TCM | RV3032_PMU_BSM, val | FIELD_PREP(RV3032_PMU_TCR, i)); } #ifdef CONFIG_COMMON_CLK #define clkout_hw_to_rv3032(hw) container_of(hw, struct rv3032_data, clkout_hw) static int clkout_xtal_rates[] = { 32768, 1024, 64, 1, }; #define RV3032_HFD_STEP 8192 static unsigned long rv3032_clkout_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) { int clkout, ret; struct rv3032_data *rv3032 = clkout_hw_to_rv3032(hw); ret = regmap_read(rv3032->regmap, RV3032_CLKOUT2, &clkout); if (ret < 0) return 0; if (clkout & RV3032_CLKOUT2_OS) { unsigned long rate = FIELD_GET(RV3032_CLKOUT2_HFD_MSK, clkout) << 8; ret = regmap_read(rv3032->regmap, RV3032_CLKOUT1, &clkout); if (ret < 0) return 0; rate += clkout + 1; return rate * RV3032_HFD_STEP; } return clkout_xtal_rates[FIELD_GET(RV3032_CLKOUT2_FD_MSK, clkout)]; } static long rv3032_clkout_round_rate(struct clk_hw *hw, unsigned long rate, unsigned long *prate) { int i, hfd; if (rate < RV3032_HFD_STEP) for (i = 0; i < ARRAY_SIZE(clkout_xtal_rates); i++) if (clkout_xtal_rates[i] <= rate) return clkout_xtal_rates[i]; hfd = DIV_ROUND_CLOSEST(rate, RV3032_HFD_STEP); return RV3032_HFD_STEP * clamp(hfd, 0, 8192); } static int rv3032_clkout_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long parent_rate) { struct rv3032_data *rv3032 = clkout_hw_to_rv3032(hw); u32 status, eerd; int i, hfd, ret; for (i = 0; i < ARRAY_SIZE(clkout_xtal_rates); i++) { if (clkout_xtal_rates[i] == rate) { return rv3032_update_cfg(rv3032, RV3032_CLKOUT2, 0xff, FIELD_PREP(RV3032_CLKOUT2_FD_MSK, i)); } } hfd = DIV_ROUND_CLOSEST(rate, RV3032_HFD_STEP); hfd = clamp(hfd, 1, 8192) - 1; ret = rv3032_enter_eerd(rv3032, &eerd); if (ret) return ret; ret = regmap_write(rv3032->regmap, RV3032_CLKOUT1, hfd & 0xff); if (ret) goto exit_eerd; ret = regmap_write(rv3032->regmap, RV3032_CLKOUT2, RV3032_CLKOUT2_OS | FIELD_PREP(RV3032_CLKOUT2_HFD_MSK, hfd >> 8)); if (ret) goto exit_eerd; ret = regmap_write(rv3032->regmap, RV3032_EEPROM_CMD, RV3032_EEPROM_CMD_UPDATE); if (ret) goto exit_eerd; usleep_range(46000, RV3032_EEBUSY_TIMEOUT); ret = regmap_read_poll_timeout(rv3032->regmap, RV3032_TLSB, status, !(status & RV3032_TLSB_EEBUSY), RV3032_EEBUSY_POLL, RV3032_EEBUSY_TIMEOUT); exit_eerd: rv3032_exit_eerd(rv3032, eerd); return ret; } static int rv3032_clkout_prepare(struct clk_hw *hw) { struct rv3032_data *rv3032 = clkout_hw_to_rv3032(hw); return rv3032_update_cfg(rv3032, RV3032_PMU, RV3032_PMU_NCLKE, 0); } static void rv3032_clkout_unprepare(struct clk_hw *hw) { struct rv3032_data *rv3032 = clkout_hw_to_rv3032(hw); rv3032_update_cfg(rv3032, RV3032_PMU, RV3032_PMU_NCLKE, RV3032_PMU_NCLKE); } static int rv3032_clkout_is_prepared(struct clk_hw *hw) { int val, ret; struct rv3032_data *rv3032 = clkout_hw_to_rv3032(hw); ret = regmap_read(rv3032->regmap, RV3032_PMU, &val); if (ret < 0) return ret; return !(val & RV3032_PMU_NCLKE); } static const struct clk_ops rv3032_clkout_ops = { .prepare = rv3032_clkout_prepare, .unprepare = rv3032_clkout_unprepare, .is_prepared = rv3032_clkout_is_prepared, .recalc_rate = rv3032_clkout_recalc_rate, .round_rate = rv3032_clkout_round_rate, .set_rate = rv3032_clkout_set_rate, }; static int rv3032_clkout_register_clk(struct rv3032_data *rv3032, struct i2c_client *client) { int ret; struct clk *clk; struct clk_init_data init; struct device_node *node = client->dev.of_node; ret = regmap_update_bits(rv3032->regmap, RV3032_TLSB, RV3032_TLSB_CLKF, 0); if (ret < 0) return ret; ret = regmap_update_bits(rv3032->regmap, RV3032_CTRL2, RV3032_CTRL2_CLKIE, 0); if (ret < 0) return ret; ret = regmap_write(rv3032->regmap, RV3032_CLK_IRQ, 0); if (ret < 0) return ret; init.name = "rv3032-clkout"; init.ops = &rv3032_clkout_ops; init.flags = 0; init.parent_names = NULL; init.num_parents = 0; rv3032->clkout_hw.init = &init; of_property_read_string(node, "clock-output-names", &init.name); clk = devm_clk_register(&client->dev, &rv3032->clkout_hw); if (!IS_ERR(clk)) of_clk_add_provider(node, of_clk_src_simple_get, clk); return 0; } #endif static int rv3032_hwmon_read_temp(struct device *dev, long *mC) { struct rv3032_data *rv3032 = dev_get_drvdata(dev); u8 buf[2]; int temp, prev = 0; int ret; ret = regmap_bulk_read(rv3032->regmap, RV3032_TLSB, buf, sizeof(buf)); if (ret) return ret; temp = sign_extend32(buf[1], 7) << 4; temp |= FIELD_GET(RV3032_TLSB_TEMP, buf[0]); /* No blocking or shadowing on RV3032_TLSB and RV3032_TMSB */ do { prev = temp; ret = regmap_bulk_read(rv3032->regmap, RV3032_TLSB, buf, sizeof(buf)); if (ret) return ret; temp = sign_extend32(buf[1], 7) << 4; temp |= FIELD_GET(RV3032_TLSB_TEMP, buf[0]); } while (temp != prev); *mC = (temp * 1000) / 16; return 0; } static umode_t rv3032_hwmon_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr, int channel) { if (type != hwmon_temp) return 0; switch (attr) { case hwmon_temp_input: return 0444; default: return 0; } } static int rv3032_hwmon_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *temp) { int err; switch (attr) { case hwmon_temp_input: err = rv3032_hwmon_read_temp(dev, temp); break; default: err = -EOPNOTSUPP; break; } return err; } static const struct hwmon_channel_info *rv3032_hwmon_info[] = { HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ), HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST), NULL }; static const struct hwmon_ops rv3032_hwmon_hwmon_ops = { .is_visible = rv3032_hwmon_is_visible, .read = rv3032_hwmon_read, }; static const struct hwmon_chip_info rv3032_hwmon_chip_info = { .ops = &rv3032_hwmon_hwmon_ops, .info = rv3032_hwmon_info, }; static void rv3032_hwmon_register(struct device *dev) { struct rv3032_data *rv3032 = dev_get_drvdata(dev); if (!IS_REACHABLE(CONFIG_HWMON)) return; devm_hwmon_device_register_with_info(dev, "rv3032", rv3032, &rv3032_hwmon_chip_info, NULL); } static const struct rtc_class_ops rv3032_rtc_ops = { .read_time = rv3032_get_time, .set_time = rv3032_set_time, .read_offset = rv3032_read_offset, .set_offset = rv3032_set_offset, .ioctl = rv3032_ioctl, .read_alarm = rv3032_get_alarm, .set_alarm = rv3032_set_alarm, .alarm_irq_enable = rv3032_alarm_irq_enable, .param_get = rv3032_param_get, .param_set = rv3032_param_set, }; static const struct regmap_config regmap_config = { .reg_bits = 8, .val_bits = 8, .max_register = 0xCA, }; static int rv3032_probe(struct i2c_client *client) { struct rv3032_data *rv3032; int ret, status; struct nvmem_config nvmem_cfg = { .name = "rv3032_nvram", .word_size = 1, .stride = 1, .size = 16, .type = NVMEM_TYPE_BATTERY_BACKED, .reg_read = rv3032_nvram_read, .reg_write = rv3032_nvram_write, }; struct nvmem_config eeprom_cfg = { .name = "rv3032_eeprom", .word_size = 1, .stride = 1, .size = 32, .type = NVMEM_TYPE_EEPROM, .reg_read = rv3032_eeprom_read, .reg_write = rv3032_eeprom_write, }; rv3032 = devm_kzalloc(&client->dev, sizeof(struct rv3032_data), GFP_KERNEL); if (!rv3032) return -ENOMEM; rv3032->regmap = devm_regmap_init_i2c(client, ®map_config); if (IS_ERR(rv3032->regmap)) return PTR_ERR(rv3032->regmap); i2c_set_clientdata(client, rv3032); ret = regmap_read(rv3032->regmap, RV3032_STATUS, &status); if (ret < 0) return ret; rv3032->rtc = devm_rtc_allocate_device(&client->dev); if (IS_ERR(rv3032->rtc)) return PTR_ERR(rv3032->rtc); if (client->irq > 0) { ret = devm_request_threaded_irq(&client->dev, client->irq, NULL, rv3032_handle_irq, IRQF_TRIGGER_LOW | IRQF_ONESHOT, "rv3032", rv3032); if (ret) { dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n"); client->irq = 0; } } if (!client->irq) clear_bit(RTC_FEATURE_ALARM, rv3032->rtc->features); ret = regmap_update_bits(rv3032->regmap, RV3032_CTRL1, RV3032_CTRL1_WADA, RV3032_CTRL1_WADA); if (ret) return ret; rv3032_trickle_charger_setup(&client->dev, rv3032); set_bit(RTC_FEATURE_BACKUP_SWITCH_MODE, rv3032->rtc->features); set_bit(RTC_FEATURE_ALARM_RES_MINUTE, rv3032->rtc->features); rv3032->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; rv3032->rtc->range_max = RTC_TIMESTAMP_END_2099; rv3032->rtc->ops = &rv3032_rtc_ops; ret = devm_rtc_register_device(rv3032->rtc); if (ret) return ret; nvmem_cfg.priv = rv3032->regmap; devm_rtc_nvmem_register(rv3032->rtc, &nvmem_cfg); eeprom_cfg.priv = rv3032; devm_rtc_nvmem_register(rv3032->rtc, &eeprom_cfg); rv3032->rtc->max_user_freq = 1; #ifdef CONFIG_COMMON_CLK rv3032_clkout_register_clk(rv3032, client); #endif rv3032_hwmon_register(&client->dev); return 0; } static const __maybe_unused struct of_device_id rv3032_of_match[] = { { .compatible = "microcrystal,rv3032", }, { } }; MODULE_DEVICE_TABLE(of, rv3032_of_match); static struct i2c_driver rv3032_driver = { .driver = { .name = "rtc-rv3032", .of_match_table = of_match_ptr(rv3032_of_match), }, .probe_new = rv3032_probe, }; module_i2c_driver(rv3032_driver); MODULE_AUTHOR("Alexandre Belloni "); MODULE_DESCRIPTION("Micro Crystal RV3032 RTC driver"); MODULE_LICENSE("GPL v2");