drivers/rtc/rtc-pcf8563.c: add alarm support
This patch adds alarm support for the NXP PCF8563 chip. Signed-off-by: Vincent Donnefort <vdonnefort@gmail.com> Cc: Simon Guinot <simon.guinot@sequanux.org> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Andrew Lunn <andrew@lunn.ch> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vincent Donnefort
Linus Torvalds
parent
2784366c67
commit
ede3e9d47c
1 changed files with 153 additions and 4 deletions
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@ -26,6 +26,8 @@
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#define PCF8563_REG_ST1 0x00 /* status */
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#define PCF8563_REG_ST2 0x01
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#define PCF8563_BIT_AIE (1 << 1)
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#define PCF8563_BIT_AF (1 << 3)
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#define PCF8563_REG_SC 0x02 /* datetime */
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#define PCF8563_REG_MN 0x03
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@ -36,9 +38,6 @@
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#define PCF8563_REG_YR 0x08
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#define PCF8563_REG_AMN 0x09 /* alarm */
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#define PCF8563_REG_AHR 0x0A
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#define PCF8563_REG_ADM 0x0B
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#define PCF8563_REG_ADW 0x0C
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#define PCF8563_REG_CLKO 0x0D /* clock out */
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#define PCF8563_REG_TMRC 0x0E /* timer control */
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@ -67,6 +66,8 @@ struct pcf8563 {
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*/
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int c_polarity; /* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */
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int voltage_low; /* incicates if a low_voltage was detected */
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struct i2c_client *client;
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};
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static int pcf8563_read_block_data(struct i2c_client *client, unsigned char reg,
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@ -115,6 +116,69 @@ static int pcf8563_write_block_data(struct i2c_client *client,
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return 0;
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}
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static int pcf8563_set_alarm_mode(struct i2c_client *client, bool on)
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{
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unsigned char buf[2];
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int err;
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err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, buf + 1);
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if (err < 0)
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return err;
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if (on)
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buf[1] |= PCF8563_BIT_AIE;
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else
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buf[1] &= ~PCF8563_BIT_AIE;
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buf[1] &= ~PCF8563_BIT_AF;
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buf[0] = PCF8563_REG_ST2;
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err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, buf + 1);
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if (err < 0) {
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dev_err(&client->dev, "%s: write error\n", __func__);
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return -EIO;
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}
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return 0;
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}
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static int pcf8563_get_alarm_mode(struct i2c_client *client, unsigned char *en,
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unsigned char *pen)
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{
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unsigned char buf;
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int err;
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err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf);
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if (err)
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return err;
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if (en)
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*en = !!(buf & PCF8563_BIT_AIE);
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if (pen)
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*pen = !!(buf & PCF8563_BIT_AF);
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return 0;
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}
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static irqreturn_t pcf8563_irq(int irq, void *dev_id)
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{
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struct pcf8563 *pcf8563 = i2c_get_clientdata(dev_id);
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int err;
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char pending;
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err = pcf8563_get_alarm_mode(pcf8563->client, NULL, &pending);
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if (err < 0)
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return err;
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if (pending) {
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rtc_update_irq(pcf8563->rtc, 1, RTC_IRQF | RTC_AF);
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pcf8563_set_alarm_mode(pcf8563->client, 1);
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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/*
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* In the routines that deal directly with the pcf8563 hardware, we use
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* rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
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@ -257,16 +321,83 @@ static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm)
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return pcf8563_set_datetime(to_i2c_client(dev), tm);
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}
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static int pcf8563_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm)
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{
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struct i2c_client *client = to_i2c_client(dev);
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unsigned char buf[4];
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int err;
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err = pcf8563_read_block_data(client, PCF8563_REG_AMN, 4, buf);
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if (err)
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return err;
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dev_dbg(&client->dev,
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"%s: raw data is min=%02x, hr=%02x, mday=%02x, wday=%02x\n",
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__func__, buf[0], buf[1], buf[2], buf[3]);
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tm->time.tm_min = bcd2bin(buf[0] & 0x7F);
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tm->time.tm_hour = bcd2bin(buf[1] & 0x7F);
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tm->time.tm_mday = bcd2bin(buf[2] & 0x1F);
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tm->time.tm_wday = bcd2bin(buf[3] & 0x7);
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tm->time.tm_mon = -1;
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tm->time.tm_year = -1;
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tm->time.tm_yday = -1;
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tm->time.tm_isdst = -1;
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err = pcf8563_get_alarm_mode(client, &tm->enabled, &tm->pending);
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if (err < 0)
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return err;
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dev_dbg(&client->dev, "%s: tm is mins=%d, hours=%d, mday=%d, wday=%d,"
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" enabled=%d, pending=%d\n", __func__, tm->time.tm_min,
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tm->time.tm_hour, tm->time.tm_mday, tm->time.tm_wday,
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tm->enabled, tm->pending);
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return 0;
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}
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static int pcf8563_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm)
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{
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struct i2c_client *client = to_i2c_client(dev);
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unsigned char buf[4];
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int err;
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dev_dbg(dev, "%s, min=%d hour=%d wday=%d mday=%d "
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"enabled=%d pending=%d\n", __func__,
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tm->time.tm_min, tm->time.tm_hour, tm->time.tm_wday,
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tm->time.tm_mday, tm->enabled, tm->pending);
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buf[0] = bin2bcd(tm->time.tm_min);
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buf[1] = bin2bcd(tm->time.tm_hour);
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buf[2] = bin2bcd(tm->time.tm_mday);
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buf[3] = tm->time.tm_wday & 0x07;
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err = pcf8563_write_block_data(client, PCF8563_REG_AMN, 4, buf);
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if (err)
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return err;
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return pcf8563_set_alarm_mode(client, 1);
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}
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static int pcf8563_irq_enable(struct device *dev, unsigned int enabled)
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{
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return pcf8563_set_alarm_mode(to_i2c_client(dev), !!enabled);
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}
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static const struct rtc_class_ops pcf8563_rtc_ops = {
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.ioctl = pcf8563_rtc_ioctl,
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.read_time = pcf8563_rtc_read_time,
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.set_time = pcf8563_rtc_set_time,
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.read_alarm = pcf8563_rtc_read_alarm,
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.set_alarm = pcf8563_rtc_set_alarm,
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.alarm_irq_enable = pcf8563_irq_enable,
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};
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static int pcf8563_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct pcf8563 *pcf8563;
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int err;
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dev_dbg(&client->dev, "%s\n", __func__);
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@ -281,12 +412,30 @@ static int pcf8563_probe(struct i2c_client *client,
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dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
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i2c_set_clientdata(client, pcf8563);
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pcf8563->client = client;
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device_set_wakeup_capable(&client->dev, 1);
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pcf8563->rtc = devm_rtc_device_register(&client->dev,
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pcf8563_driver.driver.name,
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&pcf8563_rtc_ops, THIS_MODULE);
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return PTR_ERR_OR_ZERO(pcf8563->rtc);
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if (IS_ERR(pcf8563->rtc))
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return PTR_ERR(pcf8563->rtc);
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if (client->irq > 0) {
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err = devm_request_threaded_irq(&client->dev, client->irq,
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NULL, pcf8563_irq,
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IRQF_SHARED|IRQF_ONESHOT|IRQF_TRIGGER_FALLING,
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pcf8563->rtc->name, client);
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if (err) {
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dev_err(&client->dev, "unable to request IRQ %d\n",
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client->irq);
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return err;
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}
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}
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return 0;
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}
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static const struct i2c_device_id pcf8563_id[] = {
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