Hi Andy,
Il 18/07/2018 14:47, Andy Shevchenko ha scritto:
On Wed, Jul 18, 2018 at 12:40 PM, Giulio Benetti
<giulio.benetti@xxxxxxxxxxxxxxxx> wrote:
On m41txx you can enable open-drain OUT pin to check if offset is ok.
Enabling OUT pin with frequency_test_enable attribute, OUT pin will tick
512 times faster than 1s tick base.
Enable or Disable FT bit on CONTROL register if freq_test is 1 or 0.
+static ssize_t frequency_test_enable_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct ds1307 *ds1307 = dev_get_drvdata(dev);
+ bool freq_test_en = 0;
First of all, initialization of boolean using int is not very best style.
Second, this is not needed.
Ok I remove initialization.
+ int ret;
+
+ ret = kstrtobool(buf, &freq_test_en);
+ if (ret == -EINVAL) {
What kind of other error code you may expect and why they are not
considered as no error?
According to documentation, kstrtobool can only fail with -EINVAL.
See:
https://elixir.bootlin.com/linux/v4.18-rc5/source/lib/kstrtox.c#L332
+ dev_err(dev, "Failed to store RTC Frequency Test attribute\n");
+ return ret;
+ }
+
+ regmap_update_bits(ds1307->regmap, M41TXX_REG_CONTROL, M41TXX_BIT_FT,
+ freq_test_en ? M41TXX_BIT_FT : 0);
+
+ return count;
+}
+
+static ssize_t frequency_test_enable_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct ds1307 *ds1307 = dev_get_drvdata(dev);
+ unsigned int ctrl_reg;
+
+ regmap_read(ds1307->regmap, M41TXX_REG_CONTROL, &ctrl_reg);
+
+ if (ctrl_reg & M41TXX_BIT_FT)
+ return scnprintf(buf, PAGE_SIZE, "on\n");
+ else
+ return scnprintf(buf, PAGE_SIZE, "off\n");
Entire condition might be one line.
Right, I change it.
+}
+
+static int ds1307_add_frequency_test(struct ds1307 *ds1307)
+{
+ int err = 0;
Redundant assignment. See below.
Ok.
+
+ switch (ds1307->type) {
+ case m41t0:
+ case m41t00:
+ case m41t11:
+ /* Export sysfs entries */
+ err = sysfs_create_group(&(ds1307->dev)->kobj,
+ &rtc_freq_test_attr_group);
+ if (err) {
+ dev_err(ds1307->dev,
+ "Failed to create sysfs group: %d\n",
+ err);
+ return err;
+ }
+
+ err = devm_add_action_or_reset(ds1307->dev,
+ rtc_calib_remove_sysfs_group,
+ ds1307->dev);
+ if (err) {
+ dev_err(ds1307->dev,
+ "Failed to add sysfs cleanup action: %d\n",
+ err);
+ sysfs_remove_group(&(ds1307->dev)->kobj,
+ &rtc_freq_test_attr_group);
+ return err;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return err;
return 0;
Ok.
Thanks
Giulio
