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 2014-08-08 14:20:18 -07:00 committed by Linus Torvalds
parent 2784366c67
commit ede3e9d47c

View file

@ -26,6 +26,8 @@
#define PCF8563_REG_ST1 0x00 /* status */
#define PCF8563_REG_ST2 0x01
#define PCF8563_BIT_AIE (1 << 1)
#define PCF8563_BIT_AF (1 << 3)
#define PCF8563_REG_SC 0x02 /* datetime */
#define PCF8563_REG_MN 0x03
@ -36,9 +38,6 @@
#define PCF8563_REG_YR 0x08
#define PCF8563_REG_AMN 0x09 /* alarm */
#define PCF8563_REG_AHR 0x0A
#define PCF8563_REG_ADM 0x0B
#define PCF8563_REG_ADW 0x0C
#define PCF8563_REG_CLKO 0x0D /* clock out */
#define PCF8563_REG_TMRC 0x0E /* timer control */
@ -67,6 +66,8 @@ struct pcf8563 {
*/
int c_polarity; /* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */
int voltage_low; /* incicates if a low_voltage was detected */
struct i2c_client *client;
};
static int pcf8563_read_block_data(struct i2c_client *client, unsigned char reg,
@ -115,6 +116,69 @@ static int pcf8563_write_block_data(struct i2c_client *client,
return 0;
}
static int pcf8563_set_alarm_mode(struct i2c_client *client, bool on)
{
unsigned char buf[2];
int err;
err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, buf + 1);
if (err < 0)
return err;
if (on)
buf[1] |= PCF8563_BIT_AIE;
else
buf[1] &= ~PCF8563_BIT_AIE;
buf[1] &= ~PCF8563_BIT_AF;
buf[0] = PCF8563_REG_ST2;
err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, buf + 1);
if (err < 0) {
dev_err(&client->dev, "%s: write error\n", __func__);
return -EIO;
}
return 0;
}
static int pcf8563_get_alarm_mode(struct i2c_client *client, unsigned char *en,
unsigned char *pen)
{
unsigned char buf;
int err;
err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf);
if (err)
return err;
if (en)
*en = !!(buf & PCF8563_BIT_AIE);
if (pen)
*pen = !!(buf & PCF8563_BIT_AF);
return 0;
}
static irqreturn_t pcf8563_irq(int irq, void *dev_id)
{
struct pcf8563 *pcf8563 = i2c_get_clientdata(dev_id);
int err;
char pending;
err = pcf8563_get_alarm_mode(pcf8563->client, NULL, &pending);
if (err < 0)
return err;
if (pending) {
rtc_update_irq(pcf8563->rtc, 1, RTC_IRQF | RTC_AF);
pcf8563_set_alarm_mode(pcf8563->client, 1);
return IRQ_HANDLED;
}
return IRQ_NONE;
}
/*
* In the routines that deal directly with the pcf8563 hardware, we use
* rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
@ -257,16 +321,83 @@ static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm)
return pcf8563_set_datetime(to_i2c_client(dev), tm);
}
static int pcf8563_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm)
{
struct i2c_client *client = to_i2c_client(dev);
unsigned char buf[4];
int err;
err = pcf8563_read_block_data(client, PCF8563_REG_AMN, 4, buf);
if (err)
return err;
dev_dbg(&client->dev,
"%s: raw data is min=%02x, hr=%02x, mday=%02x, wday=%02x\n",
__func__, buf[0], buf[1], buf[2], buf[3]);
tm->time.tm_min = bcd2bin(buf[0] & 0x7F);
tm->time.tm_hour = bcd2bin(buf[1] & 0x7F);
tm->time.tm_mday = bcd2bin(buf[2] & 0x1F);
tm->time.tm_wday = bcd2bin(buf[3] & 0x7);
tm->time.tm_mon = -1;
tm->time.tm_year = -1;
tm->time.tm_yday = -1;
tm->time.tm_isdst = -1;
err = pcf8563_get_alarm_mode(client, &tm->enabled, &tm->pending);
if (err < 0)
return err;
dev_dbg(&client->dev, "%s: tm is mins=%d, hours=%d, mday=%d, wday=%d,"
" enabled=%d, pending=%d\n", __func__, tm->time.tm_min,
tm->time.tm_hour, tm->time.tm_mday, tm->time.tm_wday,
tm->enabled, tm->pending);
return 0;
}
static int pcf8563_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm)
{
struct i2c_client *client = to_i2c_client(dev);
unsigned char buf[4];
int err;
dev_dbg(dev, "%s, min=%d hour=%d wday=%d mday=%d "
"enabled=%d pending=%d\n", __func__,
tm->time.tm_min, tm->time.tm_hour, tm->time.tm_wday,
tm->time.tm_mday, tm->enabled, tm->pending);
buf[0] = bin2bcd(tm->time.tm_min);
buf[1] = bin2bcd(tm->time.tm_hour);
buf[2] = bin2bcd(tm->time.tm_mday);
buf[3] = tm->time.tm_wday & 0x07;
err = pcf8563_write_block_data(client, PCF8563_REG_AMN, 4, buf);
if (err)
return err;
return pcf8563_set_alarm_mode(client, 1);
}
static int pcf8563_irq_enable(struct device *dev, unsigned int enabled)
{
return pcf8563_set_alarm_mode(to_i2c_client(dev), !!enabled);
}
static const struct rtc_class_ops pcf8563_rtc_ops = {
.ioctl = pcf8563_rtc_ioctl,
.read_time = pcf8563_rtc_read_time,
.set_time = pcf8563_rtc_set_time,
.read_alarm = pcf8563_rtc_read_alarm,
.set_alarm = pcf8563_rtc_set_alarm,
.alarm_irq_enable = pcf8563_irq_enable,
};
static int pcf8563_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct pcf8563 *pcf8563;
int err;
dev_dbg(&client->dev, "%s\n", __func__);
@ -281,12 +412,30 @@ static int pcf8563_probe(struct i2c_client *client,
dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
i2c_set_clientdata(client, pcf8563);
pcf8563->client = client;
device_set_wakeup_capable(&client->dev, 1);
pcf8563->rtc = devm_rtc_device_register(&client->dev,
pcf8563_driver.driver.name,
&pcf8563_rtc_ops, THIS_MODULE);
return PTR_ERR_OR_ZERO(pcf8563->rtc);
if (IS_ERR(pcf8563->rtc))
return PTR_ERR(pcf8563->rtc);
if (client->irq > 0) {
err = devm_request_threaded_irq(&client->dev, client->irq,
NULL, pcf8563_irq,
IRQF_SHARED|IRQF_ONESHOT|IRQF_TRIGGER_FALLING,
pcf8563->rtc->name, client);
if (err) {
dev_err(&client->dev, "unable to request IRQ %d\n",
client->irq);
return err;
}
}
return 0;
}
static const struct i2c_device_id pcf8563_id[] = {