[PATCH v4 1/3] regulator: bd9571mwv: Use "backup_mode" sysfs file instead of "wake_up"

Geert Uytterhoeven
2018-07-16T15:30:50Z

Currently the BD9571MWV PMIC driver uses the standard "wake_up" sysfs
file to control enablement of DDR Backup Mode.

However, configuring DDR Backup Mode is not really equivalent to
configuring the PMIC as a wake-up source. To avoid confusion, use a
custom "backup_mode" attribute file in sysfs instead.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
v4:
- Fix build error and warning if !CONFIG_PM_SLEEP,

v3:
- New.
---
drivers/regulator/bd9571mwv-regulator.c | 52 ++++++++++++++++++++++---
1 file changed, 47 insertions(+), 5 deletions(-)

diff --git a/drivers/regulator/bd9571mwv-regulator.c b/drivers/regulator/bd9571mwv-regulator.c
index be574eb444ebda97..1da36a6590c84ba4 100644
--- a/drivers/regulator/bd9571mwv-regulator.c
+++ b/drivers/regulator/bd9571mwv-regulator.c
@@ -30,6 +30,7 @@ struct bd9571mwv_reg {
/* DDR Backup Power */
u8 bkup_mode_cnt_keepon; /* from "rohm,ddr-backup-power" */
u8 bkup_mode_cnt_saved;
+ bool bkup_mode_enabled;

/* Power switch type */
bool rstbmode_level;
@@ -171,13 +172,40 @@ static int bd9571mwv_bkup_mode_write(struct bd9571mwv *bd, unsigned int mode)
return 0;
}

+static ssize_t backup_mode_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%s\n", bdreg->bkup_mode_enabled ? "on" : "off");
+}
+
+static ssize_t backup_mode_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
+ int ret;
+
+ if (!count)
+ return 0;
+
+ ret = kstrtobool(buf, &bdreg->bkup_mode_enabled);
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+DEVICE_ATTR_RW(backup_mode);
+
static int bd9571mwv_suspend(struct device *dev)
{
struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
unsigned int mode;
int ret;

- if (!device_may_wakeup(dev))
+ if (!bdreg->bkup_mode_enabled)
return 0;

/* Save DDR Backup Mode */
@@ -204,7 +232,7 @@ static int bd9571mwv_resume(struct device *dev)
{
struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);

- if (!device_may_wakeup(dev))
+ if (!bdreg->bkup_mode_enabled)
return 0;

/* Restore DDR Backup Mode */
@@ -215,9 +243,15 @@ static const struct dev_pm_ops bd9571mwv_pm = {
SET_SYSTEM_SLEEP_PM_OPS(bd9571mwv_suspend, bd9571mwv_resume)
};

+static int bd9571mwv_regulator_remove(struct platform_device *pdev)
+{
+ device_remove_file(&pdev->dev, &dev_attr_backup_mode);
+ return 0;
+}
#define DEV_PM_OPS &bd9571mwv_pm
#else
#define DEV_PM_OPS NULL
+#define bd9571mwv_regulator_remove NULL
#endif /* CONFIG_PM_SLEEP */

static int bd9571mwv_regulator_probe(struct platform_device *pdev)
@@ -270,14 +304,21 @@ static int bd9571mwv_regulator_probe(struct platform_device *pdev)
return -EINVAL;
}

+#ifdef CONFIG_PM_SLEEP
if (bdreg->bkup_mode_cnt_keepon) {
- device_set_wakeup_capable(&pdev->dev, true);
+ int ret;
+
/*
- * Wakeup is enabled by default in pulse mode, but needs
+ * Backup mode is enabled by default in pulse mode, but needs
* explicit user setup in level mode.
*/
- device_set_wakeup_enable(&pdev->dev, bdreg->rstbmode_pulse);
+ bdreg->bkup_mode_enabled = bdreg->rstbmode_pulse;
+
+ ret = device_create_file(&pdev->dev, &dev_attr_backup_mode);
+ if (ret)
+ return ret;
}
+#endif /* CONFIG_PM_SLEEP */

return 0;
}
@@ -294,6 +335,7 @@ static struct platform_driver bd9571mwv_regulator_driver = {
.pm = DEV_PM_OPS,
},
.probe = bd9571mwv_regulator_probe,
+ .remove = bd9571mwv_regulator_remove,
.id_table = bd9571mwv_regulator_id_table,
};
module_platform_driver(bd9571mwv_regulator_driver);
--
2.17.1