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path: root/drivers/rtc/rtc-m41t80.c
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Diffstat (limited to 'drivers/rtc/rtc-m41t80.c')
-rw-r--r--drivers/rtc/rtc-m41t80.c104
1 files changed, 45 insertions, 59 deletions
diff --git a/drivers/rtc/rtc-m41t80.c b/drivers/rtc/rtc-m41t80.c
index a5248aa1abf..7ff7427c2e6 100644
--- a/drivers/rtc/rtc-m41t80.c
+++ b/drivers/rtc/rtc-m41t80.c
@@ -66,8 +66,6 @@
#define M41T80_FEATURE_WD (1 << 3) /* Extra watchdog resolution */
#define M41T80_FEATURE_SQ_ALT (1 << 4) /* RSx bits are in reg 4 */
-#define DRV_VERSION "0.05"
-
static DEFINE_MUTEX(m41t80_rtc_mutex);
static const struct i2c_device_id m41t80_id[] = {
{ "m41t62", M41T80_FEATURE_SQ | M41T80_FEATURE_SQ_ALT },
@@ -80,6 +78,7 @@ static const struct i2c_device_id m41t80_id[] = {
{ "m41st84", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ },
{ "m41st85", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ },
{ "m41st87", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ },
+ { "rv4162", M41T80_FEATURE_SQ | M41T80_FEATURE_WD | M41T80_FEATURE_SQ_ALT },
{ }
};
MODULE_DEVICE_TABLE(i2c, m41t80_id);
@@ -232,7 +231,7 @@ static ssize_t m41t80_sysfs_show_flags(struct device *dev,
val = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS);
if (val < 0)
- return -EIO;
+ return val;
return sprintf(buf, "%#x\n", val);
}
static DEVICE_ATTR(flags, S_IRUGO, m41t80_sysfs_show_flags, NULL);
@@ -252,7 +251,7 @@ static ssize_t m41t80_sysfs_show_sqwfreq(struct device *dev,
reg_sqw = M41T80_REG_WDAY;
val = i2c_smbus_read_byte_data(client, reg_sqw);
if (val < 0)
- return -EIO;
+ return val;
val = (val >> 4) & 0xf;
switch (val) {
case 0:
@@ -271,7 +270,7 @@ static ssize_t m41t80_sysfs_set_sqwfreq(struct device *dev,
{
struct i2c_client *client = to_i2c_client(dev);
struct m41t80_data *clientdata = i2c_get_clientdata(client);
- int almon, sqw, reg_sqw;
+ int almon, sqw, reg_sqw, rc;
int val = simple_strtoul(buf, NULL, 0);
if (!(clientdata->features & M41T80_FEATURE_SQ))
@@ -291,21 +290,30 @@ static ssize_t m41t80_sysfs_set_sqwfreq(struct device *dev,
/* disable SQW, set SQW frequency & re-enable */
almon = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON);
if (almon < 0)
- return -EIO;
+ return almon;
reg_sqw = M41T80_REG_SQW;
if (clientdata->features & M41T80_FEATURE_SQ_ALT)
reg_sqw = M41T80_REG_WDAY;
sqw = i2c_smbus_read_byte_data(client, reg_sqw);
if (sqw < 0)
- return -EIO;
+ return sqw;
sqw = (sqw & 0x0f) | (val << 4);
- if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
- almon & ~M41T80_ALMON_SQWE) < 0 ||
- i2c_smbus_write_byte_data(client, reg_sqw, sqw) < 0)
- return -EIO;
- if (val && i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
- almon | M41T80_ALMON_SQWE) < 0)
- return -EIO;
+
+ rc = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
+ almon & ~M41T80_ALMON_SQWE);
+ if (rc < 0)
+ return rc;
+
+ if (val) {
+ rc = i2c_smbus_write_byte_data(client, reg_sqw, sqw);
+ if (rc < 0)
+ return rc;
+
+ rc = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
+ almon | M41T80_ALMON_SQWE);
+ if (rc <0)
+ return rc;
+ }
return count;
}
static DEVICE_ATTR(sqwfreq, S_IRUGO | S_IWUSR,
@@ -629,40 +637,28 @@ static int m41t80_probe(struct i2c_client *client,
struct m41t80_data *clientdata = NULL;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C
- | I2C_FUNC_SMBUS_BYTE_DATA)) {
- rc = -ENODEV;
- goto exit;
- }
-
- dev_info(&client->dev,
- "chip found, driver version " DRV_VERSION "\n");
+ | I2C_FUNC_SMBUS_BYTE_DATA))
+ return -ENODEV;
clientdata = devm_kzalloc(&client->dev, sizeof(*clientdata),
GFP_KERNEL);
- if (!clientdata) {
- rc = -ENOMEM;
- goto exit;
- }
+ if (!clientdata)
+ return -ENOMEM;
clientdata->features = id->driver_data;
i2c_set_clientdata(client, clientdata);
rtc = devm_rtc_device_register(&client->dev, client->name,
&m41t80_rtc_ops, THIS_MODULE);
- if (IS_ERR(rtc)) {
- rc = PTR_ERR(rtc);
- rtc = NULL;
- goto exit;
- }
+ if (IS_ERR(rtc))
+ return PTR_ERR(rtc);
clientdata->rtc = rtc;
/* Make sure HT (Halt Update) bit is cleared */
rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_HOUR);
- if (rc < 0)
- goto ht_err;
- if (rc & M41T80_ALHOUR_HT) {
+ if (rc >= 0 && rc & M41T80_ALHOUR_HT) {
if (clientdata->features & M41T80_FEATURE_HT) {
m41t80_get_datetime(client, &tm);
dev_info(&client->dev, "HT bit was set!\n");
@@ -673,53 +669,44 @@ static int m41t80_probe(struct i2c_client *client,
tm.tm_mon + 1, tm.tm_mday, tm.tm_hour,
tm.tm_min, tm.tm_sec);
}
- if (i2c_smbus_write_byte_data(client,
- M41T80_REG_ALARM_HOUR,
- rc & ~M41T80_ALHOUR_HT) < 0)
- goto ht_err;
+ rc = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_HOUR,
+ rc & ~M41T80_ALHOUR_HT);
+ }
+
+ if (rc < 0) {
+ dev_err(&client->dev, "Can't clear HT bit\n");
+ return rc;
}
/* Make sure ST (stop) bit is cleared */
rc = i2c_smbus_read_byte_data(client, M41T80_REG_SEC);
- if (rc < 0)
- goto st_err;
- if (rc & M41T80_SEC_ST) {
- if (i2c_smbus_write_byte_data(client, M41T80_REG_SEC,
- rc & ~M41T80_SEC_ST) < 0)
- goto st_err;
+ if (rc >= 0 && rc & M41T80_SEC_ST)
+ rc = i2c_smbus_write_byte_data(client, M41T80_REG_SEC,
+ rc & ~M41T80_SEC_ST);
+ if (rc < 0) {
+ dev_err(&client->dev, "Can't clear ST bit\n");
+ return rc;
}
rc = m41t80_sysfs_register(&client->dev);
if (rc)
- goto exit;
+ return rc;
#ifdef CONFIG_RTC_DRV_M41T80_WDT
if (clientdata->features & M41T80_FEATURE_HT) {
save_client = client;
rc = misc_register(&wdt_dev);
if (rc)
- goto exit;
+ return rc;
rc = register_reboot_notifier(&wdt_notifier);
if (rc) {
misc_deregister(&wdt_dev);
- goto exit;
+ return rc;
}
}
#endif
return 0;
-
-st_err:
- rc = -EIO;
- dev_err(&client->dev, "Can't clear ST bit\n");
- goto exit;
-ht_err:
- rc = -EIO;
- dev_err(&client->dev, "Can't clear HT bit\n");
- goto exit;
-
-exit:
- return rc;
}
static int m41t80_remove(struct i2c_client *client)
@@ -750,4 +737,3 @@ module_i2c_driver(m41t80_driver);
MODULE_AUTHOR("Alexander Bigga <ab@mycable.de>");
MODULE_DESCRIPTION("ST Microelectronics M41T80 series RTC I2C Client Driver");
MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_VERSION);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-04 05:58:42 +0000