AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

rtc: ds1672: move oscillator handling to .read_time

Browse Source 
Return -EINVAL when trying to read an invalid time instead of just probe
because this is a useful information for userspace.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Alexandre Belloni 2019-04-07 23:05:35 +02:00
parent d1fbe695d8
commit 10e3efc165
1 changed files with 16 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
drivers/rtc/rtc-ds1672.c
View File

@ -29,7 +29,7 @@
static int ds1672_get_datetime(struct i2c_client *client, struct rtc_time *tm)
{
unsigned long time;
unsigned char addr = DS1672_REG_CNT_BASE;
unsigned char addr = DS1672_REG_CONTROL;
unsigned char buf[4];
struct i2c_msg msgs[] = {
@ -41,11 +41,25 @@ static int ds1672_get_datetime(struct i2c_client *client, struct rtc_time *tm)
{/* read date */
.addr = client->addr,
.flags = I2C_M_RD,
.len = 4,
.len = 1,
.buf = buf
},
};
/* read control register */
if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
dev_warn(&client->dev, "Unable to read the control register\n");
return -EIO;
}
if (buf[0] & DS1672_REG_CONTROL_EOSC) {
dev_warn(&client->dev, "Oscillator not enabled. Set time to enable.\n");
return -EINVAL;
}
addr = DS1672_REG_CNT_BASE;
msgs[1].len = 4;
/* read date registers */
if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
dev_err(&client->dev, "%s: read error\n", __func__);
@ -154,7 +168,6 @@ static int ds1672_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int err = 0;
u8 control;
struct rtc_device *rtc;
dev_dbg(&client->dev, "%s\n", __func__);
@ -178,16 +191,6 @@ static int ds1672_probe(struct i2c_client *client,
i2c_set_clientdata(client, rtc);
/* read control register */
err = ds1672_get_control(client, &control);
if (err) {
dev_warn(&client->dev, "Unable to read the control register\n");
}
if (control & DS1672_REG_CONTROL_EOSC)
dev_warn(&client->dev, "Oscillator not enabled. "
"Set time to enable.\n");
/* Register sysfs hooks */
err = device_create_file(&client->dev, &dev_attr_control);
if (err)