| Message ID | 20240604040237.1064024-4-linux@roeck-us.net |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v4,1/6] dt-bindings: trivial-devices: Add jedec,spd5118 | expand |
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@gmx.de> > > Cc: Armin Wolf <W_Armin@gmx.de> > Cc: Stephen Horvath <s.horvath@outlook.com.au> > Signed-off-by: Guenter Roeck <linux@roeck-us.net> > --- > 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,
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,
Add suspend/resume support to ensure that limit and configuration registers are updated and synchronized after a suspend/resume cycle. Cc: Armin Wolf <W_Armin@gmx.de> Cc: Stephen Horvath <s.horvath@outlook.com.au> Signed-off-by: Guenter Roeck <linux@roeck-us.net> --- 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(+)