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synced 2024-11-11 12:28:41 +08:00
rtc: fixes and new functionality for fm3130
- add sanity check for alarm data in fm3130_probe - fix fm3130_set_alarm. According to the datasheet, setting match bit '0' indicates that the corresponding alarm field will be used in the match process - add operation alarm_irq_enable operation which is responsible for handling RTC_AIE_ON, RTC_AIE_OFF ioctls - remove clearing of AF bit after reading rtc/alarm control register: according to datasheet this bit is cleared anyway when rtc/alarm control register is read [akpm@linux-foundation.org: make fm3130_alarm_irq_enable() static, fix comment layout] Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com> Acked-by: Wan ZongShun <mcuos.com@gmail.com> Acked-by: Sergey Lapin <slapin@ossfans.org> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sergey Matyukevich
Linus Torvalds
parent
5824c7e667
commit
f3f99cf391
@ -52,8 +52,8 @@ struct fm3130 {
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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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int alarm;
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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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@ -87,11 +87,7 @@ static void fm3130_rtc_mode(struct device *dev, int mode)
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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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/* Checking for alarm */
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if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_AF) {
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fm3130->alarm = 1;
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fm3130->regs[FM3130_RTC_CONTROL] &= ~FM3130_RTC_CONTROL_BIT_AF;
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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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@ -208,6 +204,17 @@ static int fm3130_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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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(to_i2c_adapter(fm3130->client->dev.parent),
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&fm3130->msg[2], 2);
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@ -222,20 +229,31 @@ static int fm3130_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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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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@ -251,25 +269,20 @@ static int fm3130_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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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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if (tm->tm_sec != -1)
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fm3130->regs[FM3130_ALARM_SECONDS] =
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bin2bcd(tm->tm_sec) | 0x80;
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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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if (tm->tm_min != -1)
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fm3130->regs[FM3130_ALARM_MINUTES] =
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bin2bcd(tm->tm_min) | 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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if (tm->tm_hour != -1)
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fm3130->regs[FM3130_ALARM_HOURS] =
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bin2bcd(tm->tm_hour) | 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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if (tm->tm_mday != -1)
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fm3130->regs[FM3130_ALARM_DATE] =
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bin2bcd(tm->tm_mday) | 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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if (tm->tm_mon != -1)
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fm3130->regs[FM3130_ALARM_MONTHS] =
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bin2bcd(tm->tm_mon + 1) | 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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@ -285,11 +298,8 @@ static int fm3130_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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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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/* Checking for alarm */
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if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_AF) {
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fm3130->alarm = 1;
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fm3130->regs[FM3130_RTC_CONTROL] &= ~FM3130_RTC_CONTROL_BIT_AF;
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}
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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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@ -298,16 +308,55 @@ static int fm3130_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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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_AEN));
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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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@ -356,6 +405,7 @@ static int __devinit fm3130_probe(struct i2c_client *client,
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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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@ -370,12 +420,6 @@ static int __devinit fm3130_probe(struct i2c_client *client,
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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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/* Checking for alarm */
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if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_AF) {
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fm3130->alarm = 1;
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fm3130->regs[FM3130_RTC_CONTROL] &= ~FM3130_RTC_CONTROL_BIT_AF;
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}
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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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@ -400,44 +444,79 @@ static int __devinit fm3130_probe(struct i2c_client *client,
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fm3130->regs[FM3130_CAL_CONTROL] &
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~(FM3130_CAL_CONTROL_BIT_nOSCEN));
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/* oscillator fault? clear flag, and warn */
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if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_LB)
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/* low battery? clear flag, and warn */
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if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_LB) {
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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_LB));
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dev_warn(&client->dev, "Low battery!\n");
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}
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/* oscillator fault? clear flag, and warn */
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/* check if Power On Reset bit is set */
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if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_POR) {
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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_POR);
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dev_warn(&client->dev, "SET TIME!\n");
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dev_dbg(&client->dev, "POR bit is set\n");
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}
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/* ACS is controlled by alarm */
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i2c_smbus_write_byte_data(client, FM3130_ALARM_WP_CONTROL, 0x80);
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/* TODO */
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/* TODO need to sanity check alarm */
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tmp = fm3130->regs[FM3130_RTC_SECONDS];
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tmp = bcd2bin(tmp & 0x7f);
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if (tmp > 60)
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goto exit_bad;
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/* alarm registers sanity check */
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tmp = bcd2bin(fm3130->regs[FM3130_RTC_SECONDS] & 0x7f);
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if (tmp > 59)
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goto bad_alarm;
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tmp = bcd2bin(fm3130->regs[FM3130_RTC_MINUTES] & 0x7f);
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if (tmp > 60)
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goto exit_bad;
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if (tmp > 59)
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goto bad_alarm;
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tmp = bcd2bin(fm3130->regs[FM3130_RTC_HOURS] & 0x3f);
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if (tmp > 23)
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goto bad_alarm;
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tmp = bcd2bin(fm3130->regs[FM3130_RTC_DATE] & 0x3f);
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if (tmp == 0 || tmp > 31)
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goto exit_bad;
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goto bad_alarm;
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tmp = bcd2bin(fm3130->regs[FM3130_RTC_MONTHS] & 0x1f);
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if (tmp == 0 || tmp > 12)
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goto exit_bad;
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goto bad_alarm;
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tmp = fm3130->regs[FM3130_RTC_HOURS];
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fm3130->alarm_valid = 1;
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bad_alarm:
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/* clock registers sanity chek */
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tmp = bcd2bin(fm3130->regs[FM3130_RTC_SECONDS] & 0x7f);
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if (tmp > 59)
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goto bad_clock;
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tmp = bcd2bin(fm3130->regs[FM3130_RTC_MINUTES] & 0x7f);
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if (tmp > 59)
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goto bad_clock;
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tmp = bcd2bin(fm3130->regs[FM3130_RTC_HOURS] & 0x3f);
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if (tmp > 23)
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goto bad_clock;
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tmp = bcd2bin(fm3130->regs[FM3130_RTC_DAY] & 0x7);
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if (tmp == 0 || tmp > 7)
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goto bad_clock;
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tmp = bcd2bin(fm3130->regs[FM3130_RTC_DATE] & 0x3f);
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if (tmp == 0 || tmp > 31)
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goto bad_clock;
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tmp = bcd2bin(fm3130->regs[FM3130_RTC_MONTHS] & 0x1f);
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if (tmp == 0 || tmp > 12)
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goto bad_clock;
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fm3130->data_valid = 1;
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exit_bad:
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if (!fm3130->data_valid)
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bad_clock:
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if (!fm3130->data_valid || !fm3130->alarm_valid)
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dev_dbg(&client->dev,
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"%s: %02x %02x %02x %02x %02x %02x %02x %02x"
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"%02x %02x %02x %02x %02x %02x %02x\n",
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