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authorAlexandre Belloni <alexandre.belloni@free-electrons.com>2015-07-26 10:13:31 +0200
committerAlexandre Belloni <alexandre.belloni@free-electrons.com>2015-09-05 13:19:11 +0200
commit6f0a8cfebb898b88fb0d934d7a44a6d4c98d5285 (patch)
treee79796b8ed107ffde4647337e51ec4dcf3c33ebb /drivers/rtc
parent2e10e74df72ff0f8ea65eb1ee6e39ed8278a91bf (diff)
downloadlinux-6f0a8cfebb898b88fb0d934d7a44a6d4c98d5285.tar.bz2
rtc: rx8025: don't reset the time
Stop setting the time to epoch when it is invalid. The proper way to handle that is to return an error when it is invalid instead of returning an incorrect value. Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/rtc-rx8025.c38
1 files changed, 22 insertions, 16 deletions
diff --git a/drivers/rtc/rtc-rx8025.c b/drivers/rtc/rtc-rx8025.c
index 771558602409..d158a640299e 100644
--- a/drivers/rtc/rtc-rx8025.c
+++ b/drivers/rtc/rtc-rx8025.c
@@ -166,9 +166,23 @@ out:
static int rx8025_get_time(struct device *dev, struct rtc_time *dt)
{
struct rx8025_data *rx8025 = dev_get_drvdata(dev);
- u8 date[7];
+ u8 date[7], ctrl;
int err;
+ err = rx8025_read_reg(rx8025->client, RX8025_REG_CTRL2, &ctrl);
+ if (err)
+ return err;
+
+ if (ctrl & RX8025_BIT_CTRL2_PON) {
+ dev_warn(dev, "power-on reset detected, date is invalid\n");
+ return -EINVAL;
+ }
+
+ if (!(ctrl & RX8025_BIT_CTRL2_XST)) {
+ dev_warn(dev, "crystal stopped, date is invalid\n");
+ return -EINVAL;
+ }
+
err = rx8025_read_regs(rx8025->client, RX8025_REG_SEC, 7, date);
if (err)
return err;
@@ -230,7 +244,7 @@ static int rx8025_set_time(struct device *dev, struct rtc_time *dt)
return rx8025_write_regs(rx8025->client, RX8025_REG_SEC, 7, date);
}
-static int rx8025_init_client(struct i2c_client *client, int *need_reset)
+static int rx8025_init_client(struct i2c_client *client)
{
struct rx8025_data *rx8025 = i2c_get_clientdata(client);
u8 ctrl[2], ctrl2;
@@ -247,19 +261,19 @@ static int rx8025_init_client(struct i2c_client *client, int *need_reset)
if (ctrl[1] & RX8025_BIT_CTRL2_PON) {
dev_warn(&client->dev, "power-on reset was detected, "
"you may have to readjust the clock\n");
- *need_reset = 1;
+ need_clear = 1;
}
if (ctrl[1] & RX8025_BIT_CTRL2_VDET) {
dev_warn(&client->dev, "a power voltage drop was detected, "
"you may have to readjust the clock\n");
- *need_reset = 1;
+ need_clear = 1;
}
if (!(ctrl[1] & RX8025_BIT_CTRL2_XST)) {
dev_warn(&client->dev, "Oscillation stop was detected,"
"you may have to readjust the clock\n");
- *need_reset = 1;
+ need_clear = 1;
}
if (ctrl[1] & (RX8025_BIT_CTRL2_DAFG | RX8025_BIT_CTRL2_WAFG)) {
@@ -270,7 +284,7 @@ static int rx8025_init_client(struct i2c_client *client, int *need_reset)
if (!(ctrl[1] & RX8025_BIT_CTRL2_CTFG))
need_clear = 1;
- if (*need_reset || need_clear) {
+ if (need_clear) {
ctrl2 = ctrl[0];
ctrl2 &= ~(RX8025_BIT_CTRL2_PON | RX8025_BIT_CTRL2_VDET |
RX8025_BIT_CTRL2_CTFG | RX8025_BIT_CTRL2_WAFG |
@@ -508,7 +522,7 @@ static int rx8025_probe(struct i2c_client *client,
{
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
struct rx8025_data *rx8025;
- int err = 0, need_reset = 0;
+ int err = 0;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
| I2C_FUNC_SMBUS_I2C_BLOCK)) {
@@ -525,18 +539,10 @@ static int rx8025_probe(struct i2c_client *client,
rx8025->client = client;
i2c_set_clientdata(client, rx8025);
- err = rx8025_init_client(client, &need_reset);
+ err = rx8025_init_client(client);
if (err)
return err;
- if (need_reset) {
- struct rtc_time tm;
- dev_info(&client->dev,
- "bad conditions detected, resetting date\n");
- rtc_time_to_tm(0, &tm); /* 1970/1/1 */
- rx8025_set_time(&client->dev, &tm);
- }
-
rx8025->rtc = devm_rtc_device_register(&client->dev, client->name,
&rx8025_rtc_ops, THIS_MODULE);
if (IS_ERR(rx8025->rtc)) {