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drivers/rtc/rtc-ab8500.c: add second resolution to rtc driver 

Android expects the RTC to have second resolution.  On ab8540 cut2 RTC
block has a new register which allows setting seconds for wakeup alarms.

Existing registers (minutes hi, mid and low) have seen their offsets
changed. Here is the new mapping:
  * AlarmSec     (A) 0x22
  * AlarmMinLow  (M) from 0x8 to 0x23
  * AlarmMinMid  (M) from 0x9 to 0x24
  * AlarmMinHigh (M) from 0xA to 0x25

Signed-off-by: Julien Delacou <julien.delacou@stericsson.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexandre Torgue 2013-07-03 15:07:45 -07:00 committed by Linus Torvalds
parent 65ee88c9c6
commit 25d053cf10
1 changed files with 62 additions and 1 deletions
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63
drivers/rtc/rtc-ab8500.c
View File

@ -35,6 +35,10 @@
#define AB8500_RTC_FORCE_BKUP_REG 0x0D
#define AB8500_RTC_CALIB_REG 0x0E
#define AB8500_RTC_SWITCH_STAT_REG 0x0F
#define AB8540_RTC_ALRM_SEC 0x22
#define AB8540_RTC_ALRM_MIN_LOW_REG 0x23
#define AB8540_RTC_ALRM_MIN_MID_REG 0x24
#define AB8540_RTC_ALRM_MIN_HI_REG 0x25
/* RtcReadRequest bits */
#define RTC_READ_REQUEST 0x01
@ -58,6 +62,11 @@ static const u8 ab8500_rtc_alarm_regs[] = {
AB8500_RTC_ALRM_MIN_LOW_REG
};
static const u8 ab8540_rtc_alarm_regs[] = {
AB8540_RTC_ALRM_MIN_HI_REG, AB8540_RTC_ALRM_MIN_MID_REG,
AB8540_RTC_ALRM_MIN_LOW_REG, AB8540_RTC_ALRM_SEC
};
/* Calculate the seconds from 1970 to 01-01-2000 00:00:00 */
static unsigned long get_elapsed_seconds(int year)
{
@ -267,6 +276,42 @@ static int ab8500_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
return ab8500_rtc_irq_enable(dev, alarm->enabled);
}
static int ab8540_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
int retval, i;
unsigned char buf[ARRAY_SIZE(ab8540_rtc_alarm_regs)];
unsigned long mins, secs = 0;
if (alarm->time.tm_year < (AB8500_RTC_EPOCH - 1900)) {
dev_dbg(dev, "year should be equal to or greater than %d\n",
AB8500_RTC_EPOCH);
return -EINVAL;
}
/* Get the number of seconds since 1970 */
rtc_tm_to_time(&alarm->time, &secs);
/*
* Convert it to the number of seconds since 01-01-2000 00:00:00
*/
secs -= get_elapsed_seconds(AB8500_RTC_EPOCH);
mins = secs / 60;
buf[3] = secs % 60;
buf[2] = mins & 0xFF;
buf[1] = (mins >> 8) & 0xFF;
buf[0] = (mins >> 16) & 0xFF;
/* Set the alarm time */
for (i = 0; i < ARRAY_SIZE(ab8540_rtc_alarm_regs); i++) {
retval = abx500_set_register_interruptible(dev, AB8500_RTC,
ab8540_rtc_alarm_regs[i], buf[i]);
if (retval < 0)
return retval;
}
return ab8500_rtc_irq_enable(dev, alarm->enabled);
}
static int ab8500_rtc_set_calibration(struct device *dev, int calibration)
{
@ -389,8 +434,22 @@ static const struct rtc_class_ops ab8500_rtc_ops = {
.alarm_irq_enable = ab8500_rtc_irq_enable,
};
static const struct rtc_class_ops ab8540_rtc_ops = {
.read_time = ab8500_rtc_read_time,
.set_time = ab8500_rtc_set_time,
.read_alarm = ab8500_rtc_read_alarm,
.set_alarm = ab8540_rtc_set_alarm,
.alarm_irq_enable = ab8500_rtc_irq_enable,
};
static struct platform_device_id ab85xx_rtc_ids[] = {
{ "ab8500-rtc", (kernel_ulong_t)&ab8500_rtc_ops, },
{ "ab8540-rtc", (kernel_ulong_t)&ab8540_rtc_ops, },
};
static int ab8500_rtc_probe(struct platform_device *pdev)
{
const struct platform_device_id *platid = platform_get_device_id(pdev);
int err;
struct rtc_device *rtc;
u8 rtc_ctrl;
@ -423,7 +482,8 @@ static int ab8500_rtc_probe(struct platform_device *pdev)
device_init_wakeup(&pdev->dev, true);
rtc = devm_rtc_device_register(&pdev->dev, "ab8500-rtc",
&ab8500_rtc_ops, THIS_MODULE);
(struct rtc_class_ops *)platid->driver_data,
THIS_MODULE);
if (IS_ERR(rtc)) {
dev_err(&pdev->dev, "Registration failed\n");
err = PTR_ERR(rtc);
@ -461,6 +521,7 @@ static struct platform_driver ab8500_rtc_driver = {
},
.probe = ab8500_rtc_probe,
.remove = ab8500_rtc_remove,
.id_table = ab85xx_rtc_ids,
};
module_platform_driver(ab8500_rtc_driver);