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path: root/drivers/rtc/rtc-max8998.c
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Diffstat (limited to 'drivers/rtc/rtc-max8998.c')
-rw-r--r--drivers/rtc/rtc-max8998.c54
1 files changed, 49 insertions, 5 deletions
diff --git a/drivers/rtc/rtc-max8998.c b/drivers/rtc/rtc-max8998.c
index f22dee35f330..3f7bc6b9fefa 100644
--- a/drivers/rtc/rtc-max8998.c
+++ b/drivers/rtc/rtc-max8998.c
@@ -20,6 +20,7 @@
#include <linux/platform_device.h>
#include <linux/mfd/max8998.h>
#include <linux/mfd/max8998-private.h>
+#include <linux/delay.h>
#define MAX8998_RTC_SEC 0x00
#define MAX8998_RTC_MIN 0x01
@@ -73,6 +74,7 @@ struct max8998_rtc_info {
struct i2c_client *rtc;
struct rtc_device *rtc_dev;
int irq;
+ bool lp3974_bug_workaround;
};
static void max8998_data_to_tm(u8 *data, struct rtc_time *tm)
@@ -124,10 +126,16 @@ static int max8998_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct max8998_rtc_info *info = dev_get_drvdata(dev);
u8 data[8];
+ int ret;
max8998_tm_to_data(tm, data);
- return max8998_bulk_write(info->rtc, MAX8998_RTC_SEC, 8, data);
+ ret = max8998_bulk_write(info->rtc, MAX8998_RTC_SEC, 8, data);
+
+ if (info->lp3974_bug_workaround)
+ msleep(2000);
+
+ return ret;
}
static int max8998_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
@@ -163,12 +171,29 @@ static int max8998_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
static int max8998_rtc_stop_alarm(struct max8998_rtc_info *info)
{
- return max8998_write_reg(info->rtc, MAX8998_ALARM0_CONF, 0);
+ int ret = max8998_write_reg(info->rtc, MAX8998_ALARM0_CONF, 0);
+
+ if (info->lp3974_bug_workaround)
+ msleep(2000);
+
+ return ret;
}
static int max8998_rtc_start_alarm(struct max8998_rtc_info *info)
{
- return max8998_write_reg(info->rtc, MAX8998_ALARM0_CONF, 0x77);
+ int ret;
+ u8 alarm0_conf = 0x77;
+
+ /* LP3974 with delay bug chips has rtc alarm bugs with "MONTH" field */
+ if (info->lp3974_bug_workaround)
+ alarm0_conf = 0x57;
+
+ ret = max8998_write_reg(info->rtc, MAX8998_ALARM0_CONF, alarm0_conf);
+
+ if (info->lp3974_bug_workaround)
+ msleep(2000);
+
+ return ret;
}
static int max8998_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
@@ -187,10 +212,13 @@ static int max8998_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
if (ret < 0)
return ret;
+ if (info->lp3974_bug_workaround)
+ msleep(2000);
+
if (alrm->enabled)
- return max8998_rtc_start_alarm(info);
+ ret = max8998_rtc_start_alarm(info);
- return 0;
+ return ret;
}
static int max8998_rtc_alarm_irq_enable(struct device *dev,
@@ -224,6 +252,7 @@ static const struct rtc_class_ops max8998_rtc_ops = {
static int __devinit max8998_rtc_probe(struct platform_device *pdev)
{
struct max8998_dev *max8998 = dev_get_drvdata(pdev->dev.parent);
+ struct max8998_platform_data *pdata = dev_get_platdata(max8998->dev);
struct max8998_rtc_info *info;
int ret;
@@ -249,10 +278,18 @@ static int __devinit max8998_rtc_probe(struct platform_device *pdev)
ret = request_threaded_irq(info->irq, NULL, max8998_rtc_alarm_irq, 0,
"rtc-alarm0", info);
+
if (ret < 0)
dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
info->irq, ret);
+ dev_info(&pdev->dev, "RTC CHIP NAME: %s\n", pdev->id_entry->name);
+ if (pdata->rtc_delay) {
+ info->lp3974_bug_workaround = true;
+ dev_warn(&pdev->dev, "LP3974 with RTC REGERR option."
+ " RTC updates will be extremely slow.\n");
+ }
+
return 0;
out_rtc:
@@ -273,6 +310,12 @@ static int __devexit max8998_rtc_remove(struct platform_device *pdev)
return 0;
}
+static const struct platform_device_id max8998_rtc_id[] = {
+ { "max8998-rtc", TYPE_MAX8998 },
+ { "lp3974-rtc", TYPE_LP3974 },
+ { }
+};
+
static struct platform_driver max8998_rtc_driver = {
.driver = {
.name = "max8998-rtc",
@@ -280,6 +323,7 @@ static struct platform_driver max8998_rtc_driver = {
},
.probe = max8998_rtc_probe,
.remove = __devexit_p(max8998_rtc_remove),
+ .id_table = max8998_rtc_id,
};
static int __init max8998_rtc_init(void)