static int rs5c348_rtc_set_time(struct device *dev, struct rtc_time *tm) { struct spi_device *spi = to_spi_device(dev); struct rs5c348_plat_data *pdata = spi->dev.platform_data; u8 txbuf[5+7], *txp; int ret; /* Transfer 5 bytes before writing SEC. This gives 31us for carry. */ txp = txbuf; txbuf[0] = RS5C348_CMD_R(RS5C348_REG_CTL2); /* cmd, ctl2 */ txbuf[1] = 0; /* dummy */ txbuf[2] = RS5C348_CMD_R(RS5C348_REG_CTL2); /* cmd, ctl2 */ txbuf[3] = 0; /* dummy */ txbuf[4] = RS5C348_CMD_MW(RS5C348_REG_SECS); /* cmd, sec, ... */ txp = &txbuf[5]; txp[RS5C348_REG_SECS] = bin2bcd(tm->tm_sec); txp[RS5C348_REG_MINS] = bin2bcd(tm->tm_min); if (pdata->rtc_24h) { txp[RS5C348_REG_HOURS] = bin2bcd(tm->tm_hour); } else { /* hour 0 is AM12, noon is PM12 */ txp[RS5C348_REG_HOURS] = bin2bcd((tm->tm_hour + 11) % 12 + 1) | (tm->tm_hour >= 12 ? RS5C348_BIT_PM : 0); } txp[RS5C348_REG_WDAY] = bin2bcd(tm->tm_wday); txp[RS5C348_REG_DAY] = bin2bcd(tm->tm_mday); txp[RS5C348_REG_MONTH] = bin2bcd(tm->tm_mon + 1) | (tm->tm_year >= 100 ? RS5C348_BIT_Y2K : 0); txp[RS5C348_REG_YEAR] = bin2bcd(tm->tm_year % 100); /* write in one transfer to avoid data inconsistency */ ret = spi_write_then_read(spi, txbuf, sizeof(txbuf), NULL, 0); udelay(62); /* Tcsr 62us */ return ret; }
static int rs5c348_rtc_set_time(struct device *dev, struct rtc_time *tm) { struct spi_device *spi = to_spi_device(dev); struct rs5c348_plat_data *pdata = spi->dev.platform_data; u8 txbuf[5+7], *txp; int ret; txp = txbuf; txbuf[0] = RS5C348_CMD_R(RS5C348_REG_CTL2); txbuf[1] = 0; txbuf[2] = RS5C348_CMD_R(RS5C348_REG_CTL2); txbuf[3] = 0; txbuf[4] = RS5C348_CMD_MW(RS5C348_REG_SECS); txp = &txbuf[5]; txp[RS5C348_REG_SECS] = bin2bcd(tm->tm_sec); txp[RS5C348_REG_MINS] = bin2bcd(tm->tm_min); if (pdata->rtc_24h) { txp[RS5C348_REG_HOURS] = bin2bcd(tm->tm_hour); } else { txp[RS5C348_REG_HOURS] = bin2bcd((tm->tm_hour + 11) % 12 + 1) | (tm->tm_hour >= 12 ? RS5C348_BIT_PM : 0); } txp[RS5C348_REG_WDAY] = bin2bcd(tm->tm_wday); txp[RS5C348_REG_DAY] = bin2bcd(tm->tm_mday); txp[RS5C348_REG_MONTH] = bin2bcd(tm->tm_mon + 1) | (tm->tm_year >= 100 ? RS5C348_BIT_Y2K : 0); txp[RS5C348_REG_YEAR] = bin2bcd(tm->tm_year % 100); ret = spi_write_then_read(spi, txbuf, sizeof(txbuf), NULL, 0); udelay(62); return ret; }
static int rs5c348_rtc_read_time(struct device *dev, struct rtc_time *tm) { struct spi_device *spi = to_spi_device(dev); struct rs5c348_plat_data *pdata = dev_get_platdata(&spi->dev); u8 txbuf[5], rxbuf[7]; int ret; /* Transfer 5 byte befores reading SEC. This gives 31us for carry. */ txbuf[0] = RS5C348_CMD_R(RS5C348_REG_CTL2); /* cmd, ctl2 */ txbuf[1] = 0; /* dummy */ txbuf[2] = RS5C348_CMD_R(RS5C348_REG_CTL2); /* cmd, ctl2 */ txbuf[3] = 0; /* dummy */ txbuf[4] = RS5C348_CMD_MR(RS5C348_REG_SECS); /* cmd, sec, ... */ /* read in one transfer to avoid data inconsistency */ ret = spi_write_then_read(spi, txbuf, sizeof(txbuf), rxbuf, sizeof(rxbuf)); udelay(62); /* Tcsr 62us */ if (ret < 0) return ret; tm->tm_sec = bcd2bin(rxbuf[RS5C348_REG_SECS] & RS5C348_SECS_MASK); tm->tm_min = bcd2bin(rxbuf[RS5C348_REG_MINS] & RS5C348_MINS_MASK); tm->tm_hour = bcd2bin(rxbuf[RS5C348_REG_HOURS] & RS5C348_HOURS_MASK); if (!pdata->rtc_24h) { if (rxbuf[RS5C348_REG_HOURS] & RS5C348_BIT_PM) { tm->tm_hour -= 20; tm->tm_hour %= 12; tm->tm_hour += 12; } else tm->tm_hour %= 12; } tm->tm_wday = bcd2bin(rxbuf[RS5C348_REG_WDAY] & RS5C348_WDAY_MASK); tm->tm_mday = bcd2bin(rxbuf[RS5C348_REG_DAY] & RS5C348_DAY_MASK); tm->tm_mon = bcd2bin(rxbuf[RS5C348_REG_MONTH] & RS5C348_MONTH_MASK) - 1; /* year is 1900 + tm->tm_year */ tm->tm_year = bcd2bin(rxbuf[RS5C348_REG_YEAR]) + ((rxbuf[RS5C348_REG_MONTH] & RS5C348_BIT_Y2K) ? 100 : 0); if (rtc_valid_tm(tm) < 0) { dev_err(&spi->dev, "retrieved date/time is not valid.\n"); rtc_time_to_tm(0, tm); } return 0; }
static int rs5c348_rtc_read_time(struct device *dev, struct rtc_time *tm) { struct spi_device *spi = to_spi_device(dev); struct rs5c348_plat_data *pdata = spi->dev.platform_data; u8 txbuf[5], rxbuf[7]; int ret; txbuf[0] = RS5C348_CMD_R(RS5C348_REG_CTL2); txbuf[1] = 0; txbuf[2] = RS5C348_CMD_R(RS5C348_REG_CTL2); txbuf[3] = 0; txbuf[4] = RS5C348_CMD_MR(RS5C348_REG_SECS); ret = spi_write_then_read(spi, txbuf, sizeof(txbuf), rxbuf, sizeof(rxbuf)); udelay(62); if (ret < 0) return ret; tm->tm_sec = bcd2bin(rxbuf[RS5C348_REG_SECS] & RS5C348_SECS_MASK); tm->tm_min = bcd2bin(rxbuf[RS5C348_REG_MINS] & RS5C348_MINS_MASK); tm->tm_hour = bcd2bin(rxbuf[RS5C348_REG_HOURS] & RS5C348_HOURS_MASK); if (!pdata->rtc_24h) { tm->tm_hour %= 12; if (rxbuf[RS5C348_REG_HOURS] & RS5C348_BIT_PM) tm->tm_hour += 12; } tm->tm_wday = bcd2bin(rxbuf[RS5C348_REG_WDAY] & RS5C348_WDAY_MASK); tm->tm_mday = bcd2bin(rxbuf[RS5C348_REG_DAY] & RS5C348_DAY_MASK); tm->tm_mon = bcd2bin(rxbuf[RS5C348_REG_MONTH] & RS5C348_MONTH_MASK) - 1; tm->tm_year = bcd2bin(rxbuf[RS5C348_REG_YEAR]) + ((rxbuf[RS5C348_REG_MONTH] & RS5C348_BIT_Y2K) ? 100 : 0); if (rtc_valid_tm(tm) < 0) { dev_err(&spi->dev, "retrieved date/time is not valid.\n"); rtc_time_to_tm(0, tm); } return 0; }
static int __devinit rs5c348_probe(struct spi_device *spi) { int ret; struct rtc_device *rtc; struct rs5c348_plat_data *pdata; pdata = kzalloc(sizeof(struct rs5c348_plat_data), GFP_KERNEL); if (!pdata) return -ENOMEM; spi->dev.platform_data = pdata; /* Check D7 of SECOND register */ ret = spi_w8r8(spi, RS5C348_CMD_R(RS5C348_REG_SECS)); if (ret < 0 || (ret & 0x80)) { dev_err(&spi->dev, "not found.\n"); goto kfree_exit; } dev_info(&spi->dev, "chip found, driver version " DRV_VERSION "\n"); dev_info(&spi->dev, "spiclk %u KHz.\n", (spi->max_speed_hz + 500) / 1000); /* turn RTC on if it was not on */ ret = spi_w8r8(spi, RS5C348_CMD_R(RS5C348_REG_CTL2)); if (ret < 0) goto kfree_exit; if (ret & (RS5C348_BIT_XSTP | RS5C348_BIT_VDET)) { u8 buf[2]; struct rtc_time tm; if (ret & RS5C348_BIT_VDET) dev_warn(&spi->dev, "voltage-low detected.\n"); if (ret & RS5C348_BIT_XSTP) dev_warn(&spi->dev, "oscillator-stop detected.\n"); rtc_time_to_tm(0, &tm); /* 1970/1/1 */ ret = rs5c348_rtc_set_time(&spi->dev, &tm); if (ret < 0) goto kfree_exit; buf[0] = RS5C348_CMD_W(RS5C348_REG_CTL2); buf[1] = 0; ret = spi_write_then_read(spi, buf, sizeof(buf), NULL, 0); if (ret < 0) goto kfree_exit; } ret = spi_w8r8(spi, RS5C348_CMD_R(RS5C348_REG_CTL1)); if (ret < 0) goto kfree_exit; if (ret & RS5C348_BIT_24H) pdata->rtc_24h = 1; rtc = rtc_device_register(rs5c348_driver.driver.name, &spi->dev, &rs5c348_rtc_ops, THIS_MODULE); if (IS_ERR(rtc)) { ret = PTR_ERR(rtc); goto kfree_exit; } pdata->rtc = rtc; return 0; kfree_exit: kfree(pdata); return ret; }