530 lines
15 KiB
C
530 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* rtc-fm3130.c - RTC driver for Ramtron FM3130 I2C chip.
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*
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* Copyright (C) 2008 Sergey Lapin
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* Based on ds1307 driver by James Chapman and David Brownell
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/rtc.h>
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#include <linux/bcd.h>
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#include <linux/slab.h>
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#define FM3130_RTC_CONTROL (0x0)
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#define FM3130_CAL_CONTROL (0x1)
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#define FM3130_RTC_SECONDS (0x2)
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#define FM3130_RTC_MINUTES (0x3)
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#define FM3130_RTC_HOURS (0x4)
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#define FM3130_RTC_DAY (0x5)
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#define FM3130_RTC_DATE (0x6)
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#define FM3130_RTC_MONTHS (0x7)
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#define FM3130_RTC_YEARS (0x8)
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#define FM3130_ALARM_SECONDS (0x9)
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#define FM3130_ALARM_MINUTES (0xa)
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#define FM3130_ALARM_HOURS (0xb)
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#define FM3130_ALARM_DATE (0xc)
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#define FM3130_ALARM_MONTHS (0xd)
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#define FM3130_ALARM_WP_CONTROL (0xe)
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#define FM3130_CAL_CONTROL_BIT_nOSCEN (1 << 7) /* Osciallator enabled */
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#define FM3130_RTC_CONTROL_BIT_LB (1 << 7) /* Low battery */
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#define FM3130_RTC_CONTROL_BIT_AF (1 << 6) /* Alarm flag */
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#define FM3130_RTC_CONTROL_BIT_CF (1 << 5) /* Century overflow */
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#define FM3130_RTC_CONTROL_BIT_POR (1 << 4) /* Power on reset */
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#define FM3130_RTC_CONTROL_BIT_AEN (1 << 3) /* Alarm enable */
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#define FM3130_RTC_CONTROL_BIT_CAL (1 << 2) /* Calibration mode */
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#define FM3130_RTC_CONTROL_BIT_WRITE (1 << 1) /* W=1 -> write mode W=0 normal */
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#define FM3130_RTC_CONTROL_BIT_READ (1 << 0) /* R=1 -> read mode R=0 normal */
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#define FM3130_CLOCK_REGS 7
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#define FM3130_ALARM_REGS 5
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struct fm3130 {
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u8 reg_addr_time;
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u8 reg_addr_alarm;
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u8 regs[15];
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struct i2c_msg msg[4];
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struct i2c_client *client;
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struct rtc_device *rtc;
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int alarm_valid;
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int data_valid;
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};
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static const struct i2c_device_id fm3130_id[] = {
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{ "fm3130", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, fm3130_id);
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#define FM3130_MODE_NORMAL 0
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#define FM3130_MODE_WRITE 1
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#define FM3130_MODE_READ 2
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static void fm3130_rtc_mode(struct device *dev, int mode)
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{
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struct fm3130 *fm3130 = dev_get_drvdata(dev);
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fm3130->regs[FM3130_RTC_CONTROL] =
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i2c_smbus_read_byte_data(fm3130->client, FM3130_RTC_CONTROL);
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switch (mode) {
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case FM3130_MODE_NORMAL:
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fm3130->regs[FM3130_RTC_CONTROL] &=
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~(FM3130_RTC_CONTROL_BIT_WRITE |
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FM3130_RTC_CONTROL_BIT_READ);
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break;
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case FM3130_MODE_WRITE:
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fm3130->regs[FM3130_RTC_CONTROL] |= FM3130_RTC_CONTROL_BIT_WRITE;
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break;
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case FM3130_MODE_READ:
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fm3130->regs[FM3130_RTC_CONTROL] |= FM3130_RTC_CONTROL_BIT_READ;
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break;
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default:
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dev_dbg(dev, "invalid mode %d\n", mode);
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break;
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}
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i2c_smbus_write_byte_data(fm3130->client,
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FM3130_RTC_CONTROL, fm3130->regs[FM3130_RTC_CONTROL]);
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}
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static int fm3130_get_time(struct device *dev, struct rtc_time *t)
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{
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struct fm3130 *fm3130 = dev_get_drvdata(dev);
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int tmp;
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if (!fm3130->data_valid) {
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/* We have invalid data in RTC, probably due
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to battery faults or other problems. Return EIO
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for now, it will allow us to set data later instead
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of error during probing which disables device */
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return -EIO;
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}
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fm3130_rtc_mode(dev, FM3130_MODE_READ);
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/* read the RTC date and time registers all at once */
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tmp = i2c_transfer(fm3130->client->adapter, fm3130->msg, 2);
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if (tmp != 2) {
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dev_err(dev, "%s error %d\n", "read", tmp);
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return -EIO;
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}
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fm3130_rtc_mode(dev, FM3130_MODE_NORMAL);
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dev_dbg(dev, "%s: %15ph\n", "read", fm3130->regs);
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t->tm_sec = bcd2bin(fm3130->regs[FM3130_RTC_SECONDS] & 0x7f);
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t->tm_min = bcd2bin(fm3130->regs[FM3130_RTC_MINUTES] & 0x7f);
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tmp = fm3130->regs[FM3130_RTC_HOURS] & 0x3f;
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t->tm_hour = bcd2bin(tmp);
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t->tm_wday = bcd2bin(fm3130->regs[FM3130_RTC_DAY] & 0x07) - 1;
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t->tm_mday = bcd2bin(fm3130->regs[FM3130_RTC_DATE] & 0x3f);
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tmp = fm3130->regs[FM3130_RTC_MONTHS] & 0x1f;
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t->tm_mon = bcd2bin(tmp) - 1;
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/* assume 20YY not 19YY, and ignore CF bit */
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t->tm_year = bcd2bin(fm3130->regs[FM3130_RTC_YEARS]) + 100;
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dev_dbg(dev, "%s secs=%d, mins=%d, "
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"hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
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"read", t->tm_sec, t->tm_min,
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t->tm_hour, t->tm_mday,
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t->tm_mon, t->tm_year, t->tm_wday);
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return 0;
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}
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static int fm3130_set_time(struct device *dev, struct rtc_time *t)
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{
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struct fm3130 *fm3130 = dev_get_drvdata(dev);
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int tmp, i;
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u8 *buf = fm3130->regs;
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dev_dbg(dev, "%s secs=%d, mins=%d, "
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"hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
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"write", t->tm_sec, t->tm_min,
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t->tm_hour, t->tm_mday,
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t->tm_mon, t->tm_year, t->tm_wday);
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/* first register addr */
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buf[FM3130_RTC_SECONDS] = bin2bcd(t->tm_sec);
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buf[FM3130_RTC_MINUTES] = bin2bcd(t->tm_min);
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buf[FM3130_RTC_HOURS] = bin2bcd(t->tm_hour);
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buf[FM3130_RTC_DAY] = bin2bcd(t->tm_wday + 1);
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buf[FM3130_RTC_DATE] = bin2bcd(t->tm_mday);
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buf[FM3130_RTC_MONTHS] = bin2bcd(t->tm_mon + 1);
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/* assume 20YY not 19YY */
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tmp = t->tm_year - 100;
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buf[FM3130_RTC_YEARS] = bin2bcd(tmp);
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dev_dbg(dev, "%s: %15ph\n", "write", buf);
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fm3130_rtc_mode(dev, FM3130_MODE_WRITE);
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/* Writing time registers, we don't support multibyte transfers */
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for (i = 0; i < FM3130_CLOCK_REGS; i++) {
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i2c_smbus_write_byte_data(fm3130->client,
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FM3130_RTC_SECONDS + i,
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fm3130->regs[FM3130_RTC_SECONDS + i]);
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}
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fm3130_rtc_mode(dev, FM3130_MODE_NORMAL);
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/* We assume here that data are valid once written */
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if (!fm3130->data_valid)
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fm3130->data_valid = 1;
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return 0;
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}
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static int fm3130_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct fm3130 *fm3130 = dev_get_drvdata(dev);
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int tmp;
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struct rtc_time *tm = &alrm->time;
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if (!fm3130->alarm_valid) {
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/*
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* We have invalid alarm in RTC, probably due to battery faults
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* or other problems. Return EIO for now, it will allow us to
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* set alarm value later instead of error during probing which
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* disables device
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*/
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return -EIO;
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}
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/* read the RTC alarm registers all at once */
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tmp = i2c_transfer(fm3130->client->adapter, &fm3130->msg[2], 2);
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if (tmp != 2) {
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dev_err(dev, "%s error %d\n", "read", tmp);
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return -EIO;
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}
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dev_dbg(dev, "alarm read %02x %02x %02x %02x %02x\n",
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fm3130->regs[FM3130_ALARM_SECONDS],
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fm3130->regs[FM3130_ALARM_MINUTES],
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fm3130->regs[FM3130_ALARM_HOURS],
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fm3130->regs[FM3130_ALARM_DATE],
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fm3130->regs[FM3130_ALARM_MONTHS]);
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tm->tm_sec = bcd2bin(fm3130->regs[FM3130_ALARM_SECONDS] & 0x7F);
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tm->tm_min = bcd2bin(fm3130->regs[FM3130_ALARM_MINUTES] & 0x7F);
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tm->tm_hour = bcd2bin(fm3130->regs[FM3130_ALARM_HOURS] & 0x3F);
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tm->tm_mday = bcd2bin(fm3130->regs[FM3130_ALARM_DATE] & 0x3F);
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tm->tm_mon = bcd2bin(fm3130->regs[FM3130_ALARM_MONTHS] & 0x1F);
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if (tm->tm_mon > 0)
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tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
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dev_dbg(dev, "%s secs=%d, mins=%d, "
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"hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
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"read alarm", tm->tm_sec, tm->tm_min,
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tm->tm_hour, tm->tm_mday,
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tm->tm_mon, tm->tm_year, tm->tm_wday);
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/* check if alarm enabled */
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fm3130->regs[FM3130_RTC_CONTROL] =
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i2c_smbus_read_byte_data(fm3130->client, FM3130_RTC_CONTROL);
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if ((fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_AEN) &&
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(~fm3130->regs[FM3130_RTC_CONTROL] &
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FM3130_RTC_CONTROL_BIT_CAL)) {
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alrm->enabled = 1;
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}
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return 0;
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}
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static int fm3130_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct fm3130 *fm3130 = dev_get_drvdata(dev);
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struct rtc_time *tm = &alrm->time;
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int i;
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dev_dbg(dev, "%s secs=%d, mins=%d, "
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"hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
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"write alarm", tm->tm_sec, tm->tm_min,
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tm->tm_hour, tm->tm_mday,
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tm->tm_mon, tm->tm_year, tm->tm_wday);
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fm3130->regs[FM3130_ALARM_SECONDS] =
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(tm->tm_sec != -1) ? bin2bcd(tm->tm_sec) : 0x80;
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fm3130->regs[FM3130_ALARM_MINUTES] =
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(tm->tm_min != -1) ? bin2bcd(tm->tm_min) : 0x80;
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fm3130->regs[FM3130_ALARM_HOURS] =
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(tm->tm_hour != -1) ? bin2bcd(tm->tm_hour) : 0x80;
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fm3130->regs[FM3130_ALARM_DATE] =
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(tm->tm_mday != -1) ? bin2bcd(tm->tm_mday) : 0x80;
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fm3130->regs[FM3130_ALARM_MONTHS] =
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(tm->tm_mon != -1) ? bin2bcd(tm->tm_mon + 1) : 0x80;
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dev_dbg(dev, "alarm write %02x %02x %02x %02x %02x\n",
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fm3130->regs[FM3130_ALARM_SECONDS],
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fm3130->regs[FM3130_ALARM_MINUTES],
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fm3130->regs[FM3130_ALARM_HOURS],
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fm3130->regs[FM3130_ALARM_DATE],
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fm3130->regs[FM3130_ALARM_MONTHS]);
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/* Writing time registers, we don't support multibyte transfers */
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for (i = 0; i < FM3130_ALARM_REGS; i++) {
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i2c_smbus_write_byte_data(fm3130->client,
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FM3130_ALARM_SECONDS + i,
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fm3130->regs[FM3130_ALARM_SECONDS + i]);
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}
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fm3130->regs[FM3130_RTC_CONTROL] =
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i2c_smbus_read_byte_data(fm3130->client, FM3130_RTC_CONTROL);
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/* enable or disable alarm */
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if (alrm->enabled) {
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i2c_smbus_write_byte_data(fm3130->client, FM3130_RTC_CONTROL,
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(fm3130->regs[FM3130_RTC_CONTROL] &
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~(FM3130_RTC_CONTROL_BIT_CAL)) |
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FM3130_RTC_CONTROL_BIT_AEN);
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} else {
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i2c_smbus_write_byte_data(fm3130->client, FM3130_RTC_CONTROL,
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fm3130->regs[FM3130_RTC_CONTROL] &
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~(FM3130_RTC_CONTROL_BIT_CAL) &
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~(FM3130_RTC_CONTROL_BIT_AEN));
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}
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/* We assume here that data is valid once written */
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if (!fm3130->alarm_valid)
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fm3130->alarm_valid = 1;
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return 0;
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}
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static int fm3130_alarm_irq_enable(struct device *dev, unsigned int enabled)
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{
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struct fm3130 *fm3130 = dev_get_drvdata(dev);
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int ret = 0;
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fm3130->regs[FM3130_RTC_CONTROL] =
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i2c_smbus_read_byte_data(fm3130->client, FM3130_RTC_CONTROL);
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dev_dbg(dev, "alarm_irq_enable: enable=%d, FM3130_RTC_CONTROL=%02x\n",
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enabled, fm3130->regs[FM3130_RTC_CONTROL]);
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switch (enabled) {
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case 0: /* alarm off */
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ret = i2c_smbus_write_byte_data(fm3130->client,
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FM3130_RTC_CONTROL, fm3130->regs[FM3130_RTC_CONTROL] &
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~(FM3130_RTC_CONTROL_BIT_CAL) &
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~(FM3130_RTC_CONTROL_BIT_AEN));
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break;
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case 1: /* alarm on */
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ret = i2c_smbus_write_byte_data(fm3130->client,
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FM3130_RTC_CONTROL, (fm3130->regs[FM3130_RTC_CONTROL] &
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~(FM3130_RTC_CONTROL_BIT_CAL)) |
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FM3130_RTC_CONTROL_BIT_AEN);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static const struct rtc_class_ops fm3130_rtc_ops = {
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.read_time = fm3130_get_time,
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.set_time = fm3130_set_time,
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.read_alarm = fm3130_read_alarm,
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.set_alarm = fm3130_set_alarm,
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.alarm_irq_enable = fm3130_alarm_irq_enable,
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};
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static struct i2c_driver fm3130_driver;
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static int fm3130_probe(struct i2c_client *client)
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{
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struct fm3130 *fm3130;
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int err = -ENODEV;
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int tmp;
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struct i2c_adapter *adapter = client->adapter;
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if (!i2c_check_functionality(adapter,
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I2C_FUNC_I2C | I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
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return -EIO;
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fm3130 = devm_kzalloc(&client->dev, sizeof(struct fm3130), GFP_KERNEL);
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if (!fm3130)
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return -ENOMEM;
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fm3130->client = client;
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i2c_set_clientdata(client, fm3130);
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fm3130->reg_addr_time = FM3130_RTC_SECONDS;
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fm3130->reg_addr_alarm = FM3130_ALARM_SECONDS;
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/* Messages to read time */
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fm3130->msg[0].addr = client->addr;
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fm3130->msg[0].flags = 0;
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fm3130->msg[0].len = 1;
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fm3130->msg[0].buf = &fm3130->reg_addr_time;
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fm3130->msg[1].addr = client->addr;
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fm3130->msg[1].flags = I2C_M_RD;
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fm3130->msg[1].len = FM3130_CLOCK_REGS;
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fm3130->msg[1].buf = &fm3130->regs[FM3130_RTC_SECONDS];
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/* Messages to read alarm */
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fm3130->msg[2].addr = client->addr;
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fm3130->msg[2].flags = 0;
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fm3130->msg[2].len = 1;
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fm3130->msg[2].buf = &fm3130->reg_addr_alarm;
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fm3130->msg[3].addr = client->addr;
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fm3130->msg[3].flags = I2C_M_RD;
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fm3130->msg[3].len = FM3130_ALARM_REGS;
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fm3130->msg[3].buf = &fm3130->regs[FM3130_ALARM_SECONDS];
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fm3130->alarm_valid = 0;
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fm3130->data_valid = 0;
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tmp = i2c_transfer(adapter, fm3130->msg, 4);
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if (tmp != 4) {
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dev_dbg(&client->dev, "read error %d\n", tmp);
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err = -EIO;
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goto exit_free;
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}
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fm3130->regs[FM3130_RTC_CONTROL] =
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i2c_smbus_read_byte_data(client, FM3130_RTC_CONTROL);
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fm3130->regs[FM3130_CAL_CONTROL] =
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i2c_smbus_read_byte_data(client, FM3130_CAL_CONTROL);
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/* Disabling calibration mode */
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if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_CAL) {
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i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL,
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fm3130->regs[FM3130_RTC_CONTROL] &
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~(FM3130_RTC_CONTROL_BIT_CAL));
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dev_warn(&client->dev, "Disabling calibration mode!\n");
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}
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/* Disabling read and write modes */
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if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_WRITE ||
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fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_READ) {
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i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL,
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fm3130->regs[FM3130_RTC_CONTROL] &
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~(FM3130_RTC_CONTROL_BIT_READ |
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FM3130_RTC_CONTROL_BIT_WRITE));
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dev_warn(&client->dev, "Disabling READ or WRITE mode!\n");
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}
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|
|
/* oscillator off? turn it on, so clock can tick. */
|
|
if (fm3130->regs[FM3130_CAL_CONTROL] & FM3130_CAL_CONTROL_BIT_nOSCEN)
|
|
i2c_smbus_write_byte_data(client, FM3130_CAL_CONTROL,
|
|
fm3130->regs[FM3130_CAL_CONTROL] &
|
|
~(FM3130_CAL_CONTROL_BIT_nOSCEN));
|
|
|
|
/* low battery? clear flag, and warn */
|
|
if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_LB) {
|
|
i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL,
|
|
fm3130->regs[FM3130_RTC_CONTROL] &
|
|
~(FM3130_RTC_CONTROL_BIT_LB));
|
|
dev_warn(&client->dev, "Low battery!\n");
|
|
}
|
|
|
|
/* check if Power On Reset bit is set */
|
|
if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_POR) {
|
|
i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL,
|
|
fm3130->regs[FM3130_RTC_CONTROL] &
|
|
~FM3130_RTC_CONTROL_BIT_POR);
|
|
dev_dbg(&client->dev, "POR bit is set\n");
|
|
}
|
|
/* ACS is controlled by alarm */
|
|
i2c_smbus_write_byte_data(client, FM3130_ALARM_WP_CONTROL, 0x80);
|
|
|
|
/* alarm registers sanity check */
|
|
tmp = bcd2bin(fm3130->regs[FM3130_RTC_SECONDS] & 0x7f);
|
|
if (tmp > 59)
|
|
goto bad_alarm;
|
|
|
|
tmp = bcd2bin(fm3130->regs[FM3130_RTC_MINUTES] & 0x7f);
|
|
if (tmp > 59)
|
|
goto bad_alarm;
|
|
|
|
tmp = bcd2bin(fm3130->regs[FM3130_RTC_HOURS] & 0x3f);
|
|
if (tmp > 23)
|
|
goto bad_alarm;
|
|
|
|
tmp = bcd2bin(fm3130->regs[FM3130_RTC_DATE] & 0x3f);
|
|
if (tmp == 0 || tmp > 31)
|
|
goto bad_alarm;
|
|
|
|
tmp = bcd2bin(fm3130->regs[FM3130_RTC_MONTHS] & 0x1f);
|
|
if (tmp == 0 || tmp > 12)
|
|
goto bad_alarm;
|
|
|
|
fm3130->alarm_valid = 1;
|
|
|
|
bad_alarm:
|
|
|
|
/* clock registers sanity chek */
|
|
tmp = bcd2bin(fm3130->regs[FM3130_RTC_SECONDS] & 0x7f);
|
|
if (tmp > 59)
|
|
goto bad_clock;
|
|
|
|
tmp = bcd2bin(fm3130->regs[FM3130_RTC_MINUTES] & 0x7f);
|
|
if (tmp > 59)
|
|
goto bad_clock;
|
|
|
|
tmp = bcd2bin(fm3130->regs[FM3130_RTC_HOURS] & 0x3f);
|
|
if (tmp > 23)
|
|
goto bad_clock;
|
|
|
|
tmp = bcd2bin(fm3130->regs[FM3130_RTC_DAY] & 0x7);
|
|
if (tmp == 0 || tmp > 7)
|
|
goto bad_clock;
|
|
|
|
tmp = bcd2bin(fm3130->regs[FM3130_RTC_DATE] & 0x3f);
|
|
if (tmp == 0 || tmp > 31)
|
|
goto bad_clock;
|
|
|
|
tmp = bcd2bin(fm3130->regs[FM3130_RTC_MONTHS] & 0x1f);
|
|
if (tmp == 0 || tmp > 12)
|
|
goto bad_clock;
|
|
|
|
fm3130->data_valid = 1;
|
|
|
|
bad_clock:
|
|
|
|
if (!fm3130->data_valid || !fm3130->alarm_valid)
|
|
dev_dbg(&client->dev, "%s: %15ph\n", "bogus registers",
|
|
fm3130->regs);
|
|
|
|
/* We won't bail out here because we just got invalid data.
|
|
Time setting from u-boot doesn't work anyway */
|
|
fm3130->rtc = devm_rtc_device_register(&client->dev, client->name,
|
|
&fm3130_rtc_ops, THIS_MODULE);
|
|
if (IS_ERR(fm3130->rtc)) {
|
|
err = PTR_ERR(fm3130->rtc);
|
|
dev_err(&client->dev,
|
|
"unable to register the class device\n");
|
|
goto exit_free;
|
|
}
|
|
return 0;
|
|
exit_free:
|
|
return err;
|
|
}
|
|
|
|
static struct i2c_driver fm3130_driver = {
|
|
.driver = {
|
|
.name = "rtc-fm3130",
|
|
},
|
|
.probe_new = fm3130_probe,
|
|
.id_table = fm3130_id,
|
|
};
|
|
|
|
module_i2c_driver(fm3130_driver);
|
|
|
|
MODULE_DESCRIPTION("RTC driver for FM3130");
|
|
MODULE_AUTHOR("Sergey Lapin <slapin@ossfans.org>");
|
|
MODULE_LICENSE("GPL");
|
|
|