Am 04.06.24 um 06:02 schrieb Guenter Roeck:
Add suspend/resume support to ensure that limit and configuration
registers are updated and synchronized after a suspend/resume cycle.
Tested-by: Armin Wolf <W_Armin@xxxxxx>
Cc: Armin Wolf <W_Armin@xxxxxx>
Cc: Stephen Horvath <s.horvath@xxxxxxxxxxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
v4: Fix bug seen if the enable attribute was never read prior
to a suspend/resume cycle.
v3: No change
v2: New patch
drivers/hwmon/spd5118.c | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/drivers/hwmon/spd5118.c b/drivers/hwmon/spd5118.c
index d3fc0ae17743..d55c073ff5fd 100644
--- a/drivers/hwmon/spd5118.c
+++ b/drivers/hwmon/spd5118.c
@@ -20,6 +20,7 @@
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/module.h>
+#include <linux/pm.h>
#include <linux/regmap.h>
#include <linux/units.h>
@@ -432,6 +433,8 @@ static int spd5118_probe(struct i2c_client *client)
if (!spd5118_vendor_valid(bank, vendor))
return -ENODEV;
+ dev_set_drvdata(dev, regmap);
+
hwmon_dev = devm_hwmon_device_register_with_info(dev, "spd5118",
regmap, &spd5118_chip_info,
NULL);
@@ -449,6 +452,41 @@ static int spd5118_probe(struct i2c_client *client)
return 0;
}
+static int spd5118_suspend(struct device *dev)
+{
+ struct regmap *regmap = dev_get_drvdata(dev);
+ u32 regval;
+ int err;
+
+ /*
+ * Make sure the configuration register in the regmap cache is current
+ * before bypassing it.
+ */
+ err = regmap_read(regmap, SPD5118_REG_TEMP_CONFIG, ®val);
+ if (err < 0)
+ return err;
+
+ regcache_cache_bypass(regmap, true);
+ regmap_update_bits(regmap, SPD5118_REG_TEMP_CONFIG, SPD5118_TS_DISABLE,
+ SPD5118_TS_DISABLE);
+ regcache_cache_bypass(regmap, false);
+
+ regcache_cache_only(regmap, true);
+ regcache_mark_dirty(regmap);
+
+ return 0;
+}
+
+static int spd5118_resume(struct device *dev)
+{
+ struct regmap *regmap = dev_get_drvdata(dev);
+
+ regcache_cache_only(regmap, false);
+ return regcache_sync(regmap);
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(spd5118_pm_ops, spd5118_suspend, spd5118_resume);
+
static const struct i2c_device_id spd5118_id[] = {
{ "spd5118", 0 },
{ }
@@ -466,6 +504,7 @@ static struct i2c_driver spd5118_driver = {
.driver = {
.name = "spd5118",
.of_match_table = spd5118_of_ids,
+ .pm = pm_sleep_ptr(&spd5118_pm_ops),
},
.probe = spd5118_probe,
.id_table = spd5118_id,
