// SPDX-License-Identifier: GPL-2.0-or-later /* * Intersil ISL1208 rtc class driver * * Copyright 2005,2006 Hebert Valerio Riedel */ #include #include #include #include #include #include /* Register map */ /* rtc section */ #define ISL1208_REG_SC 0x00 #define ISL1208_REG_MN 0x01 #define ISL1208_REG_HR 0x02 #define ISL1208_REG_HR_MIL (1<<7) /* 24h/12h mode */ #define ISL1208_REG_HR_PM (1<<5) /* PM/AM bit in 12h mode */ #define ISL1208_REG_DT 0x03 #define ISL1208_REG_MO 0x04 #define ISL1208_REG_YR 0x05 #define ISL1208_REG_DW 0x06 #define ISL1208_RTC_SECTION_LEN 7 /* control/status section */ #define ISL1208_REG_SR 0x07 #define ISL1208_REG_SR_ARST (1<<7) /* auto reset */ #define ISL1208_REG_SR_XTOSCB (1<<6) /* crystal oscillator */ #define ISL1208_REG_SR_WRTC (1<<4) /* write rtc */ #define ISL1208_REG_SR_EVT (1<<3) /* event */ #define ISL1208_REG_SR_ALM (1<<2) /* alarm */ #define ISL1208_REG_SR_BAT (1<<1) /* battery */ #define ISL1208_REG_SR_RTCF (1<<0) /* rtc fail */ #define ISL1208_REG_INT 0x08 #define ISL1208_REG_INT_ALME (1<<6) /* alarm enable */ #define ISL1208_REG_INT_IM (1<<7) /* interrupt/alarm mode */ #define ISL1219_REG_EV 0x09 #define ISL1219_REG_EV_EVEN (1<<4) /* event detection enable */ #define ISL1219_REG_EV_EVIENB (1<<7) /* event in pull-up disable */ #define ISL1208_REG_ATR 0x0a #define ISL1208_REG_DTR 0x0b /* alarm section */ #define ISL1208_REG_SCA 0x0c #define ISL1208_REG_MNA 0x0d #define ISL1208_REG_HRA 0x0e #define ISL1208_REG_DTA 0x0f #define ISL1208_REG_MOA 0x10 #define ISL1208_REG_DWA 0x11 #define ISL1208_ALARM_SECTION_LEN 6 /* user section */ #define ISL1208_REG_USR1 0x12 #define ISL1208_REG_USR2 0x13 #define ISL1208_USR_SECTION_LEN 2 /* event section */ #define ISL1219_REG_SCT 0x14 #define ISL1219_REG_MNT 0x15 #define ISL1219_REG_HRT 0x16 #define ISL1219_REG_DTT 0x17 #define ISL1219_REG_MOT 0x18 #define ISL1219_REG_YRT 0x19 #define ISL1219_EVT_SECTION_LEN 6 static struct i2c_driver isl1208_driver; /* ISL1208 various variants */ enum isl1208_id { TYPE_ISL1208 = 0, TYPE_ISL1209, TYPE_ISL1218, TYPE_ISL1219, ISL_LAST_ID }; /* Chip capabilities table */ static const struct isl1208_config { const char name[8]; unsigned int nvmem_length; unsigned has_tamper:1; unsigned has_timestamp:1; } isl1208_configs[] = { [TYPE_ISL1208] = { "isl1208", 2, false, false }, [TYPE_ISL1209] = { "isl1209", 2, true, false }, [TYPE_ISL1218] = { "isl1218", 8, false, false }, [TYPE_ISL1219] = { "isl1219", 2, true, true }, }; static const struct i2c_device_id isl1208_id[] = { { "isl1208", TYPE_ISL1208 }, { "isl1209", TYPE_ISL1209 }, { "isl1218", TYPE_ISL1218 }, { "isl1219", TYPE_ISL1219 }, { } }; MODULE_DEVICE_TABLE(i2c, isl1208_id); static const struct of_device_id isl1208_of_match[] = { { .compatible = "isil,isl1208", .data = &isl1208_configs[TYPE_ISL1208] }, { .compatible = "isil,isl1209", .data = &isl1208_configs[TYPE_ISL1209] }, { .compatible = "isil,isl1218", .data = &isl1208_configs[TYPE_ISL1218] }, { .compatible = "isil,isl1219", .data = &isl1208_configs[TYPE_ISL1219] }, { } }; MODULE_DEVICE_TABLE(of, isl1208_of_match); /* Device state */ struct isl1208_state { struct nvmem_config nvmem_config; struct rtc_device *rtc; const struct isl1208_config *config; }; /* block read */ static int isl1208_i2c_read_regs(struct i2c_client *client, u8 reg, u8 buf[], unsigned len) { int ret; WARN_ON(reg > ISL1219_REG_YRT); WARN_ON(reg + len > ISL1219_REG_YRT + 1); ret = i2c_smbus_read_i2c_block_data(client, reg, len, buf); return (ret < 0) ? ret : 0; } /* block write */ static int isl1208_i2c_set_regs(struct i2c_client *client, u8 reg, u8 const buf[], unsigned len) { int ret; WARN_ON(reg > ISL1219_REG_YRT); WARN_ON(reg + len > ISL1219_REG_YRT + 1); ret = i2c_smbus_write_i2c_block_data(client, reg, len, buf); return (ret < 0) ? ret : 0; } /* simple check to see whether we have a isl1208 */ static int isl1208_i2c_validate_client(struct i2c_client *client) { u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, }; u8 zero_mask[ISL1208_RTC_SECTION_LEN] = { 0x80, 0x80, 0x40, 0xc0, 0xe0, 0x00, 0xf8 }; int i; int ret; ret = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN); if (ret < 0) return ret; for (i = 0; i < ISL1208_RTC_SECTION_LEN; ++i) { if (regs[i] & zero_mask[i]) /* check if bits are cleared */ return -ENODEV; } return 0; } static int isl1208_i2c_get_sr(struct i2c_client *client) { return i2c_smbus_read_byte_data(client, ISL1208_REG_SR); } static int isl1208_i2c_get_atr(struct i2c_client *client) { int atr = i2c_smbus_read_byte_data(client, ISL1208_REG_ATR); if (atr < 0) return atr; /* The 6bit value in the ATR register controls the load * capacitance C_load * in steps of 0.25pF * * bit (1<<5) of the ATR register is inverted * * C_load(ATR=0x20) = 4.50pF * C_load(ATR=0x00) = 12.50pF * C_load(ATR=0x1f) = 20.25pF * */ atr &= 0x3f; /* mask out lsb */ atr ^= 1 << 5; /* invert 6th bit */ atr += 2 * 9; /* add offset of 4.5pF; unit[atr] = 0.25pF */ return atr; } /* returns adjustment value + 100 */ static int isl1208_i2c_get_dtr(struct i2c_client *client) { int dtr = i2c_smbus_read_byte_data(client, ISL1208_REG_DTR); if (dtr < 0) return -EIO; /* dtr encodes adjustments of {-60,-40,-20,0,20,40,60} ppm */ dtr = ((dtr & 0x3) * 20) * (dtr & (1 << 2) ? -1 : 1); return dtr + 100; } static int isl1208_i2c_get_usr(struct i2c_client *client) { u8 buf[ISL1208_USR_SECTION_LEN] = { 0, }; int ret; ret = isl1208_i2c_read_regs(client, ISL1208_REG_USR1, buf, ISL1208_USR_SECTION_LEN); if (ret < 0) return ret; return (buf[1] << 8) | buf[0]; } static int isl1208_i2c_set_usr(struct i2c_client *client, u16 usr) { u8 buf[ISL1208_USR_SECTION_LEN]; buf[0] = usr & 0xff; buf[1] = (usr >> 8) & 0xff; return isl1208_i2c_set_regs(client, ISL1208_REG_USR1, buf, ISL1208_USR_SECTION_LEN); } static int isl1208_rtc_toggle_alarm(struct i2c_client *client, int enable) { int icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT); if (icr < 0) { dev_err(&client->dev, "%s: reading INT failed\n", __func__); return icr; } if (enable) icr |= ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM; else icr &= ~(ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM); icr = i2c_smbus_write_byte_data(client, ISL1208_REG_INT, icr); if (icr < 0) { dev_err(&client->dev, "%s: writing INT failed\n", __func__); return icr; } return 0; } static int isl1208_rtc_proc(struct device *dev, struct seq_file *seq) { struct i2c_client *const client = to_i2c_client(dev); int sr, dtr, atr, usr; sr = isl1208_i2c_get_sr(client); if (sr < 0) { dev_err(&client->dev, "%s: reading SR failed\n", __func__); return sr; } seq_printf(seq, "status_reg\t:%s%s%s%s%s%s (0x%.2x)\n", (sr & ISL1208_REG_SR_RTCF) ? " RTCF" : "", (sr & ISL1208_REG_SR_BAT) ? " BAT" : "", (sr & ISL1208_REG_SR_ALM) ? " ALM" : "", (sr & ISL1208_REG_SR_WRTC) ? " WRTC" : "", (sr & ISL1208_REG_SR_XTOSCB) ? " XTOSCB" : "", (sr & ISL1208_REG_SR_ARST) ? " ARST" : "", sr); seq_printf(seq, "batt_status\t: %s\n", (sr & ISL1208_REG_SR_RTCF) ? "bad" : "okay"); dtr = isl1208_i2c_get_dtr(client); if (dtr >= 0) seq_printf(seq, "digital_trim\t: %d ppm\n", dtr - 100); atr = isl1208_i2c_get_atr(client); if (atr >= 0) seq_printf(seq, "analog_trim\t: %d.%.2d pF\n", atr >> 2, (atr & 0x3) * 25); usr = isl1208_i2c_get_usr(client); if (usr >= 0) seq_printf(seq, "user_data\t: 0x%.4x\n", usr); return 0; } static int isl1208_i2c_read_time(struct i2c_client *client, struct rtc_time *tm) { int sr; u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, }; sr = isl1208_i2c_get_sr(client); if (sr < 0) { dev_err(&client->dev, "%s: reading SR failed\n", __func__); return -EIO; } sr = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN); if (sr < 0) { dev_err(&client->dev, "%s: reading RTC section failed\n", __func__); return sr; } tm->tm_sec = bcd2bin(regs[ISL1208_REG_SC]); tm->tm_min = bcd2bin(regs[ISL1208_REG_MN]); /* HR field has a more complex interpretation */ { const u8 _hr = regs[ISL1208_REG_HR]; if (_hr & ISL1208_REG_HR_MIL) /* 24h format */ tm->tm_hour = bcd2bin(_hr & 0x3f); else { /* 12h format */ tm->tm_hour = bcd2bin(_hr & 0x1f); if (_hr & ISL1208_REG_HR_PM) /* PM flag set */ tm->tm_hour += 12; } } tm->tm_mday = bcd2bin(regs[ISL1208_REG_DT]); tm->tm_mon = bcd2bin(regs[ISL1208_REG_MO]) - 1; /* rtc starts at 1 */ tm->tm_year = bcd2bin(regs[ISL1208_REG_YR]) + 100; tm->tm_wday = bcd2bin(regs[ISL1208_REG_DW]); return 0; } static int isl1208_i2c_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm) { struct rtc_time *const tm = &alarm->time; u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, }; int icr, yr, sr = isl1208_i2c_get_sr(client); if (sr < 0) { dev_err(&client->dev, "%s: reading SR failed\n", __func__); return sr; } sr = isl1208_i2c_read_regs(client, ISL1208_REG_SCA, regs, ISL1208_ALARM_SECTION_LEN); if (sr < 0) { dev_err(&client->dev, "%s: reading alarm section failed\n", __func__); return sr; } /* MSB of each alarm register is an enable bit */ tm->tm_sec = bcd2bin(regs[ISL1208_REG_SCA - ISL1208_REG_SCA] & 0x7f); tm->tm_min = bcd2bin(regs[ISL1208_REG_MNA - ISL1208_REG_SCA] & 0x7f); tm->tm_hour = bcd2bin(regs[ISL1208_REG_HRA - ISL1208_REG_SCA] & 0x3f); tm->tm_mday = bcd2bin(regs[ISL1208_REG_DTA - ISL1208_REG_SCA] & 0x3f); tm->tm_mon = bcd2bin(regs[ISL1208_REG_MOA - ISL1208_REG_SCA] & 0x1f) - 1; tm->tm_wday = bcd2bin(regs[ISL1208_REG_DWA - ISL1208_REG_SCA] & 0x03); /* The alarm doesn't store the year so get it from the rtc section */ yr = i2c_smbus_read_byte_data(client, ISL1208_REG_YR); if (yr < 0) { dev_err(&client->dev, "%s: reading RTC YR failed\n", __func__); return yr; } tm->tm_year = bcd2bin(yr) + 100; icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT); if (icr < 0) { dev_err(&client->dev, "%s: reading INT failed\n", __func__); return icr; } alarm->enabled = !!(icr & ISL1208_REG_INT_ALME); return 0; } static int isl1208_i2c_set_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm) { struct rtc_time *alarm_tm = &alarm->time; u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, }; const int offs = ISL1208_REG_SCA; struct rtc_time rtc_tm; int err, enable; err = isl1208_i2c_read_time(client, &rtc_tm); if (err) return err; /* If the alarm time is before the current time disable the alarm */ if (!alarm->enabled || rtc_tm_sub(alarm_tm, &rtc_tm) <= 0) enable = 0x00; else enable = 0x80; /* Program the alarm and enable it for each setting */ regs[ISL1208_REG_SCA - offs] = bin2bcd(alarm_tm->tm_sec) | enable; regs[ISL1208_REG_MNA - offs] = bin2bcd(alarm_tm->tm_min) | enable; regs[ISL1208_REG_HRA - offs] = bin2bcd(alarm_tm->tm_hour) | ISL1208_REG_HR_MIL | enable; regs[ISL1208_REG_DTA - offs] = bin2bcd(alarm_tm->tm_mday) | enable; regs[ISL1208_REG_MOA - offs] = bin2bcd(alarm_tm->tm_mon + 1) | enable; regs[ISL1208_REG_DWA - offs] = bin2bcd(alarm_tm->tm_wday & 7) | enable; /* write ALARM registers */ err = isl1208_i2c_set_regs(client, offs, regs, ISL1208_ALARM_SECTION_LEN); if (err < 0) { dev_err(&client->dev, "%s: writing ALARM section failed\n", __func__); return err; } err = isl1208_rtc_toggle_alarm(client, enable); if (err) return err; return 0; } static int isl1208_rtc_read_time(struct device *dev, struct rtc_time *tm) { return isl1208_i2c_read_time(to_i2c_client(dev), tm); } static int isl1208_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm) { int sr; u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, }; /* The clock has an 8 bit wide bcd-coded register (they never learn) * for the year. tm_year is an offset from 1900 and we are interested * in the 2000-2099 range, so any value less than 100 is invalid. */ if (tm->tm_year < 100) return -EINVAL; regs[ISL1208_REG_SC] = bin2bcd(tm->tm_sec); regs[ISL1208_REG_MN] = bin2bcd(tm->tm_min); regs[ISL1208_REG_HR] = bin2bcd(tm->tm_hour) | ISL1208_REG_HR_MIL; regs[ISL1208_REG_DT] = bin2bcd(tm->tm_mday); regs[ISL1208_REG_MO] = bin2bcd(tm->tm_mon + 1); regs[ISL1208_REG_YR] = bin2bcd(tm->tm_year - 100); regs[ISL1208_REG_DW] = bin2bcd(tm->tm_wday & 7); sr = isl1208_i2c_get_sr(client); if (sr < 0) { dev_err(&client->dev, "%s: reading SR failed\n", __func__); return sr; } /* set WRTC */ sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr | ISL1208_REG_SR_WRTC); if (sr < 0) { dev_err(&client->dev, "%s: writing SR failed\n", __func__); return sr; } /* write RTC registers */ sr = isl1208_i2c_set_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN); if (sr < 0) { dev_err(&client->dev, "%s: writing RTC section failed\n", __func__); return sr; } /* clear WRTC again */ sr = isl1208_i2c_get_sr(client); if (sr < 0) { dev_err(&client->dev, "%s: reading SR failed\n", __func__); return sr; } sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr & ~ISL1208_REG_SR_WRTC); if (sr < 0) { dev_err(&client->dev, "%s: writing SR failed\n", __func__); return sr; } return 0; } static int isl1208_rtc_set_time(struct device *dev, struct rtc_time *tm) { return isl1208_i2c_set_time(to_i2c_client(dev), tm); } static int isl1208_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) { return isl1208_i2c_read_alarm(to_i2c_client(dev), alarm); } static int isl1208_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) { return isl1208_i2c_set_alarm(to_i2c_client(dev), alarm); } static ssize_t timestamp0_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct i2c_client *client = to_i2c_client(dev->parent); int sr; sr = isl1208_i2c_get_sr(client); if (sr < 0) { dev_err(dev, "%s: reading SR failed\n", __func__); return sr; } sr &= ~ISL1208_REG_SR_EVT; sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr); if (sr < 0) dev_err(dev, "%s: writing SR failed\n", __func__); return count; }; static ssize_t timestamp0_show(struct device *dev, struct device_attribute *attr, char *buf) { struct i2c_client *client = to_i2c_client(dev->parent); u8 regs[ISL1219_EVT_SECTION_LEN] = { 0, }; struct rtc_time tm; int sr; sr = isl1208_i2c_get_sr(client); if (sr < 0) { dev_err(dev, "%s: reading SR failed\n", __func__); return sr; } if (!(sr & ISL1208_REG_SR_EVT)) return 0; sr = isl1208_i2c_read_regs(client, ISL1219_REG_SCT, regs, ISL1219_EVT_SECTION_LEN); if (sr < 0) { dev_err(dev, "%s: reading event section failed\n", __func__); return 0; } /* MSB of each alarm register is an enable bit */ tm.tm_sec = bcd2bin(regs[ISL1219_REG_SCT - ISL1219_REG_SCT] & 0x7f); tm.tm_min = bcd2bin(regs[ISL1219_REG_MNT - ISL1219_REG_SCT] & 0x7f); tm.tm_hour = bcd2bin(regs[ISL1219_REG_HRT - ISL1219_REG_SCT] & 0x3f); tm.tm_mday = bcd2bin(regs[ISL1219_REG_DTT - ISL1219_REG_SCT] & 0x3f); tm.tm_mon = bcd2bin(regs[ISL1219_REG_MOT - ISL1219_REG_SCT] & 0x1f) - 1; tm.tm_year = bcd2bin(regs[ISL1219_REG_YRT - ISL1219_REG_SCT]) + 100; sr = rtc_valid_tm(&tm); if (sr) return sr; return sprintf(buf, "%llu\n", (unsigned long long)rtc_tm_to_time64(&tm)); }; static DEVICE_ATTR_RW(timestamp0); static irqreturn_t isl1208_rtc_interrupt(int irq, void *data) { unsigned long timeout = jiffies + msecs_to_jiffies(1000); struct i2c_client *client = data; struct isl1208_state *isl1208 = i2c_get_clientdata(client); int handled = 0, sr, err; /* * I2C reads get NAK'ed if we read straight away after an interrupt? * Using a mdelay/msleep didn't seem to help either, so we work around * this by continually trying to read the register for a short time. */ while (1) { sr = isl1208_i2c_get_sr(client); if (sr >= 0) break; if (time_after(jiffies, timeout)) { dev_err(&client->dev, "%s: reading SR failed\n", __func__); return sr; } } if (sr & ISL1208_REG_SR_ALM) { dev_dbg(&client->dev, "alarm!\n"); rtc_update_irq(isl1208->rtc, 1, RTC_IRQF | RTC_AF); /* Clear the alarm */ sr &= ~ISL1208_REG_SR_ALM; sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr); if (sr < 0) dev_err(&client->dev, "%s: writing SR failed\n", __func__); else handled = 1; /* Disable the alarm */ err = isl1208_rtc_toggle_alarm(client, 0); if (err) return err; } if (isl1208->config->has_tamper && (sr & ISL1208_REG_SR_EVT)) { dev_warn(&client->dev, "event detected"); handled = 1; if (isl1208->config->has_timestamp) sysfs_notify(&isl1208->rtc->dev.kobj, NULL, dev_attr_timestamp0.attr.name); } return handled ? IRQ_HANDLED : IRQ_NONE; } static const struct rtc_class_ops isl1208_rtc_ops = { .proc = isl1208_rtc_proc, .read_time = isl1208_rtc_read_time, .set_time = isl1208_rtc_set_time, .read_alarm = isl1208_rtc_read_alarm, .set_alarm = isl1208_rtc_set_alarm, }; /* sysfs interface */ static ssize_t isl1208_sysfs_show_atrim(struct device *dev, struct device_attribute *attr, char *buf) { int atr = isl1208_i2c_get_atr(to_i2c_client(dev->parent)); if (atr < 0) return atr; return sprintf(buf, "%d.%.2d pF\n", atr >> 2, (atr & 0x3) * 25); } static DEVICE_ATTR(atrim, S_IRUGO, isl1208_sysfs_show_atrim, NULL); static ssize_t isl1208_sysfs_show_dtrim(struct device *dev, struct device_attribute *attr, char *buf) { int dtr = isl1208_i2c_get_dtr(to_i2c_client(dev->parent)); if (dtr < 0) return dtr; return sprintf(buf, "%d ppm\n", dtr - 100); } static DEVICE_ATTR(dtrim, S_IRUGO, isl1208_sysfs_show_dtrim, NULL); static ssize_t isl1208_sysfs_show_usr(struct device *dev, struct device_attribute *attr, char *buf) { int usr = isl1208_i2c_get_usr(to_i2c_client(dev->parent)); if (usr < 0) return usr; return sprintf(buf, "0x%.4x\n", usr); } static ssize_t isl1208_sysfs_store_usr(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { int usr = -1; if (buf[0] == '0' && (buf[1] == 'x' || buf[1] == 'X')) { if (sscanf(buf, "%x", &usr) != 1) return -EINVAL; } else { if (sscanf(buf, "%d", &usr) != 1) return -EINVAL; } if (usr < 0 || usr > 0xffff) return -EINVAL; if (isl1208_i2c_set_usr(to_i2c_client(dev->parent), usr)) return -EIO; return count; } static DEVICE_ATTR(usr, S_IRUGO | S_IWUSR, isl1208_sysfs_show_usr, isl1208_sysfs_store_usr); static struct attribute *isl1208_rtc_attrs[] = { &dev_attr_atrim.attr, &dev_attr_dtrim.attr, &dev_attr_usr.attr, NULL }; static const struct attribute_group isl1208_rtc_sysfs_files = { .attrs = isl1208_rtc_attrs, }; static struct attribute *isl1219_rtc_attrs[] = { &dev_attr_timestamp0.attr, NULL }; static const struct attribute_group isl1219_rtc_sysfs_files = { .attrs = isl1219_rtc_attrs, }; static int isl1208_nvmem_read(void *priv, unsigned int off, void *buf, size_t count) { struct isl1208_state *isl1208 = priv; struct i2c_client *client = to_i2c_client(isl1208->rtc->dev.parent); int ret; /* nvmem sanitizes offset/count for us, but count==0 is possible */ if (!count) return count; ret = isl1208_i2c_read_regs(client, ISL1208_REG_USR1 + off, buf, count); return ret == 0 ? count : ret; } static int isl1208_nvmem_write(void *priv, unsigned int off, void *buf, size_t count) { struct isl1208_state *isl1208 = priv; struct i2c_client *client = to_i2c_client(isl1208->rtc->dev.parent); int ret; /* nvmem sanitizes off/count for us, but count==0 is possible */ if (!count) return count; ret = isl1208_i2c_set_regs(client, ISL1208_REG_USR1 + off, buf, count); return ret == 0 ? count : ret; } static const struct nvmem_config isl1208_nvmem_config = { .name = "isl1208_nvram", .word_size = 1, .stride = 1, /* .size from chip specific config */ .reg_read = isl1208_nvmem_read, .reg_write = isl1208_nvmem_write, }; static int isl1208_setup_irq(struct i2c_client *client, int irq) { int rc = devm_request_threaded_irq(&client->dev, irq, NULL, isl1208_rtc_interrupt, IRQF_SHARED | IRQF_ONESHOT, isl1208_driver.driver.name, client); if (!rc) { device_init_wakeup(&client->dev, 1); enable_irq_wake(irq); } else { dev_err(&client->dev, "Unable to request irq %d, no alarm support\n", irq); } return rc; } static int isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id) { int rc = 0; struct isl1208_state *isl1208; int evdet_irq = -1; if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) return -ENODEV; if (isl1208_i2c_validate_client(client) < 0) return -ENODEV; /* Allocate driver state, point i2c client data to it */ isl1208 = devm_kzalloc(&client->dev, sizeof(*isl1208), GFP_KERNEL); if (!isl1208) return -ENOMEM; i2c_set_clientdata(client, isl1208); /* Determine which chip we have */ if (client->dev.of_node) { isl1208->config = of_device_get_match_data(&client->dev); if (!isl1208->config) return -ENODEV; } else { if (id->driver_data >= ISL_LAST_ID) return -ENODEV; isl1208->config = &isl1208_configs[id->driver_data]; } isl1208->rtc = devm_rtc_allocate_device(&client->dev); if (IS_ERR(isl1208->rtc)) return PTR_ERR(isl1208->rtc); isl1208->rtc->ops = &isl1208_rtc_ops; /* Setup nvmem configuration in driver state struct */ isl1208->nvmem_config = isl1208_nvmem_config; isl1208->nvmem_config.size = isl1208->config->nvmem_length; isl1208->nvmem_config.priv = isl1208; rc = isl1208_i2c_get_sr(client); if (rc < 0) { dev_err(&client->dev, "reading status failed\n"); return rc; } if (rc & ISL1208_REG_SR_RTCF) dev_warn(&client->dev, "rtc power failure detected, " "please set clock.\n"); if (isl1208->config->has_tamper) { struct device_node *np = client->dev.of_node; u32 evienb; rc = i2c_smbus_read_byte_data(client, ISL1219_REG_EV); if (rc < 0) { dev_err(&client->dev, "failed to read EV reg\n"); return rc; } rc |= ISL1219_REG_EV_EVEN; if (!of_property_read_u32(np, "isil,ev-evienb", &evienb)) { if (evienb) rc |= ISL1219_REG_EV_EVIENB; else rc &= ~ISL1219_REG_EV_EVIENB; } rc = i2c_smbus_write_byte_data(client, ISL1219_REG_EV, rc); if (rc < 0) { dev_err(&client->dev, "could not enable tamper detection\n"); return rc; } evdet_irq = of_irq_get_byname(np, "evdet"); } if (isl1208->config->has_timestamp) { rc = rtc_add_group(isl1208->rtc, &isl1219_rtc_sysfs_files); if (rc) return rc; } rc = rtc_add_group(isl1208->rtc, &isl1208_rtc_sysfs_files); if (rc) return rc; if (client->irq > 0) rc = isl1208_setup_irq(client, client->irq); if (rc) return rc; if (evdet_irq > 0 && evdet_irq != client->irq) rc = isl1208_setup_irq(client, evdet_irq); if (rc) return rc; rc = rtc_nvmem_register(isl1208->rtc, &isl1208->nvmem_config); if (rc) return rc; return rtc_register_device(isl1208->rtc); } static struct i2c_driver isl1208_driver = { .driver = { .name = "rtc-isl1208", .of_match_table = of_match_ptr(isl1208_of_match), }, .probe = isl1208_probe, .id_table = isl1208_id, }; module_i2c_driver(isl1208_driver); MODULE_AUTHOR("Herbert Valerio Riedel "); MODULE_DESCRIPTION("Intersil ISL1208 RTC driver"); MODULE_LICENSE("GPL");