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authorAlexandre Torgue <alexandre.torgue@st.com>2013-07-03 15:07:45 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-07-03 16:07:59 -0700
commit25d053cf1040e6430fff679854b3710edb0b7fee (patch)
tree634f4687c40095081c1bef141085d2c7e1f30732 /drivers/rtc/rtc-ab8500.c
parent65ee88c9c68ad533463d1030d2abd859d7a4d9f9 (diff)
downloadop-kernel-dev-25d053cf1040e6430fff679854b3710edb0b7fee.zip
op-kernel-dev-25d053cf1040e6430fff679854b3710edb0b7fee.tar.gz
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>
Diffstat (limited to 'drivers/rtc/rtc-ab8500.c')
-rw-r--r--drivers/rtc/rtc-ab8500.c63
1 files changed, 62 insertions, 1 deletions
diff --git a/drivers/rtc/rtc-ab8500.c b/drivers/rtc/rtc-ab8500.c
index c5b62d4..727e2f5 100644
--- a/drivers/rtc/rtc-ab8500.c
+++ b/drivers/rtc/rtc-ab8500.c
@@ -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);
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