* [PATCH 0/2] hwmon: ina3221: Add suspend and resume functions @ 2018-09-28 21:49 Nicolin Chen 2018-09-28 21:49 ` [PATCH 1/2] hwmon: ina3221: Add INA3221_CONFIG to volatile_table Nicolin Chen 2018-09-28 21:49 ` [PATCH 2/2] hwmon: ina3221: Add suspend and resume functions Nicolin Chen 0 siblings, 2 replies; 5+ messages in thread From: Nicolin Chen @ 2018-09-28 21:49 UTC (permalink / raw) To: jdelvare, linux; +Cc: afd, linux-hwmon, linux-kernel This series of patches add system suspend and resume functiosn for ina3221 hwmon driver. Nicolin Chen (2): hwmon: ina3221: Add INA3221_CONFIG to volatile_table hwmon: ina3221: Add suspend and resume functions drivers/hwmon/ina3221.c | 56 ++++++++++++++++++++++++++++++++++++++++- 1 file changed, 55 insertions(+), 1 deletion(-) -- 2.17.1 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH 1/2] hwmon: ina3221: Add INA3221_CONFIG to volatile_table 2018-09-28 21:49 [PATCH 0/2] hwmon: ina3221: Add suspend and resume functions Nicolin Chen @ 2018-09-28 21:49 ` Nicolin Chen 2018-09-28 21:49 ` [PATCH 2/2] hwmon: ina3221: Add suspend and resume functions Nicolin Chen 1 sibling, 0 replies; 5+ messages in thread From: Nicolin Chen @ 2018-09-28 21:49 UTC (permalink / raw) To: jdelvare, linux; +Cc: afd, linux-hwmon, linux-kernel The MSB (15th bit) of INA3221_CONFIG is a self-clear reset bit. So this register should be added to the volatile_table of the regmap_config. Otherwise, we will see this bit is sticky in the regcache which might accidentally reset the chip when an actual write happens to the register. This might not be a severe bug for the current code line since there's no second place touching the INA3221_CONFIG except the reset routine in the probe(). Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com> --- drivers/hwmon/ina3221.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/hwmon/ina3221.c b/drivers/hwmon/ina3221.c index e6b49500c52a..cfe65ff01051 100644 --- a/drivers/hwmon/ina3221.c +++ b/drivers/hwmon/ina3221.c @@ -353,7 +353,7 @@ static struct attribute *ina3221_attrs[] = { ATTRIBUTE_GROUPS(ina3221); static const struct regmap_range ina3221_yes_ranges[] = { - regmap_reg_range(INA3221_SHUNT1, INA3221_BUS3), + regmap_reg_range(INA3221_CONFIG, INA3221_BUS3), regmap_reg_range(INA3221_MASK_ENABLE, INA3221_MASK_ENABLE), }; -- 2.17.1 ^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH 2/2] hwmon: ina3221: Add suspend and resume functions 2018-09-28 21:49 [PATCH 0/2] hwmon: ina3221: Add suspend and resume functions Nicolin Chen 2018-09-28 21:49 ` [PATCH 1/2] hwmon: ina3221: Add INA3221_CONFIG to volatile_table Nicolin Chen @ 2018-09-28 21:49 ` Nicolin Chen 2018-09-29 15:33 ` Guenter Roeck 1 sibling, 1 reply; 5+ messages in thread From: Nicolin Chen @ 2018-09-28 21:49 UTC (permalink / raw) To: jdelvare, linux; +Cc: afd, linux-hwmon, linux-kernel Depending on the hardware design, an INA3221 chip might lose its power during system suspend/resume. So this patch adds a pair of suspend and resume functions to cache the register values including config register value and limit settings. Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com> --- drivers/hwmon/ina3221.c | 54 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) diff --git a/drivers/hwmon/ina3221.c b/drivers/hwmon/ina3221.c index cfe65ff01051..26f66f728b27 100644 --- a/drivers/hwmon/ina3221.c +++ b/drivers/hwmon/ina3221.c @@ -91,11 +91,13 @@ static const unsigned int register_channel[] = { * @regmap: Register map of the device * @fields: Register fields of the device * @shunt_resistors: Array of resistor values per channel + * @reg_config: Register value of INA3221_CONFIG */ struct ina3221_data { struct regmap *regmap; struct regmap_field *fields[F_MAX_FIELDS]; int shunt_resistors[INA3221_NUM_CHANNELS]; + u32 reg_config; }; static int ina3221_read_value(struct ina3221_data *ina, unsigned int reg, @@ -415,8 +417,59 @@ static int ina3221_probe(struct i2c_client *client, return PTR_ERR(hwmon_dev); } + dev_set_drvdata(dev, ina); + + return 0; +} + +#ifdef CONFIG_PM +static int ina3221_suspend(struct device *dev) +{ + struct ina3221_data *ina = dev_get_drvdata(dev); + int ret; + + /* Save config register value and enable cache-only */ + ret = regmap_read(ina->regmap, INA3221_CONFIG, &ina->reg_config); + if (ret) + return ret; + + regcache_cache_only(ina->regmap, true); + regcache_mark_dirty(ina->regmap); + + return 0; +} + +static int ina3221_resume(struct device *dev) +{ + struct ina3221_data *ina = dev_get_drvdata(dev); + int ret; + + regcache_cache_only(ina->regmap, false); + + /* Software reset the chip */ + ret = regmap_field_write(ina->fields[F_RST], true); + if (ret) { + dev_err(dev, "Unable to reset device\n"); + return ret; + } + + /* Restore cached register values to hardware */ + ret = regcache_sync(ina->regmap); + if (ret) + return ret; + + /* Restore config register value to hardware */ + ret = regmap_write(ina->regmap, INA3221_CONFIG, ina->reg_config); + if (ret) + return ret; + return 0; } +#endif + +static const struct dev_pm_ops ina3221_pm = { + SET_SYSTEM_SLEEP_PM_OPS(ina3221_suspend, ina3221_resume) +}; static const struct of_device_id ina3221_of_match_table[] = { { .compatible = "ti,ina3221", }, @@ -435,6 +488,7 @@ static struct i2c_driver ina3221_i2c_driver = { .driver = { .name = INA3221_DRIVER_NAME, .of_match_table = ina3221_of_match_table, + .pm = &ina3221_pm, }, .id_table = ina3221_ids, }; -- 2.17.1 ^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH 2/2] hwmon: ina3221: Add suspend and resume functions 2018-09-28 21:49 ` [PATCH 2/2] hwmon: ina3221: Add suspend and resume functions Nicolin Chen @ 2018-09-29 15:33 ` Guenter Roeck 2018-09-29 19:12 ` Nicolin Chen 0 siblings, 1 reply; 5+ messages in thread From: Guenter Roeck @ 2018-09-29 15:33 UTC (permalink / raw) To: Nicolin Chen; +Cc: jdelvare, afd, linux-hwmon, linux-kernel On Fri, Sep 28, 2018 at 02:49:21PM -0700, Nicolin Chen wrote: > Depending on the hardware design, an INA3221 chip might lose > its power during system suspend/resume. So this patch adds > a pair of suspend and resume functions to cache the register > values including config register value and limit settings. > > Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com> > --- > drivers/hwmon/ina3221.c | 54 +++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 54 insertions(+) > > diff --git a/drivers/hwmon/ina3221.c b/drivers/hwmon/ina3221.c > index cfe65ff01051..26f66f728b27 100644 > --- a/drivers/hwmon/ina3221.c > +++ b/drivers/hwmon/ina3221.c > @@ -91,11 +91,13 @@ static const unsigned int register_channel[] = { > * @regmap: Register map of the device > * @fields: Register fields of the device > * @shunt_resistors: Array of resistor values per channel > + * @reg_config: Register value of INA3221_CONFIG > */ > struct ina3221_data { > struct regmap *regmap; > struct regmap_field *fields[F_MAX_FIELDS]; > int shunt_resistors[INA3221_NUM_CHANNELS]; > + u32 reg_config; > }; > > static int ina3221_read_value(struct ina3221_data *ina, unsigned int reg, > @@ -415,8 +417,59 @@ static int ina3221_probe(struct i2c_client *client, > return PTR_ERR(hwmon_dev); > } > > + dev_set_drvdata(dev, ina); > + > + return 0; > +} > + > +#ifdef CONFIG_PM > +static int ina3221_suspend(struct device *dev) > +{ > + struct ina3221_data *ina = dev_get_drvdata(dev); > + int ret; > + > + /* Save config register value and enable cache-only */ > + ret = regmap_read(ina->regmap, INA3221_CONFIG, &ina->reg_config); > + if (ret) > + return ret; > + Would it make sense to explicitly disable all channels here ? Thanks, Guenter > + regcache_cache_only(ina->regmap, true); > + regcache_mark_dirty(ina->regmap); > + > + return 0; > +} > + > +static int ina3221_resume(struct device *dev) > +{ > + struct ina3221_data *ina = dev_get_drvdata(dev); > + int ret; > + > + regcache_cache_only(ina->regmap, false); > + > + /* Software reset the chip */ > + ret = regmap_field_write(ina->fields[F_RST], true); > + if (ret) { > + dev_err(dev, "Unable to reset device\n"); > + return ret; > + } > + > + /* Restore cached register values to hardware */ > + ret = regcache_sync(ina->regmap); > + if (ret) > + return ret; > + > + /* Restore config register value to hardware */ > + ret = regmap_write(ina->regmap, INA3221_CONFIG, ina->reg_config); > + if (ret) > + return ret; > + > return 0; > } > +#endif > + > +static const struct dev_pm_ops ina3221_pm = { > + SET_SYSTEM_SLEEP_PM_OPS(ina3221_suspend, ina3221_resume) > +}; > > static const struct of_device_id ina3221_of_match_table[] = { > { .compatible = "ti,ina3221", }, > @@ -435,6 +488,7 @@ static struct i2c_driver ina3221_i2c_driver = { > .driver = { > .name = INA3221_DRIVER_NAME, > .of_match_table = ina3221_of_match_table, > + .pm = &ina3221_pm, > }, > .id_table = ina3221_ids, > }; > -- > 2.17.1 > ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH 2/2] hwmon: ina3221: Add suspend and resume functions 2018-09-29 15:33 ` Guenter Roeck @ 2018-09-29 19:12 ` Nicolin Chen 0 siblings, 0 replies; 5+ messages in thread From: Nicolin Chen @ 2018-09-29 19:12 UTC (permalink / raw) To: Guenter Roeck; +Cc: jdelvare, afd, linux-hwmon, linux-kernel On Sat, Sep 29, 2018 at 08:33:46AM -0700, Guenter Roeck wrote: > On Fri, Sep 28, 2018 at 02:49:21PM -0700, Nicolin Chen wrote: > > Depending on the hardware design, an INA3221 chip might lose > > its power during system suspend/resume. So this patch adds > > a pair of suspend and resume functions to cache the register > > values including config register value and limit settings. > > > > Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com> > > --- > > drivers/hwmon/ina3221.c | 54 +++++++++++++++++++++++++++++++++++++++++ > > 1 file changed, 54 insertions(+) > > > > diff --git a/drivers/hwmon/ina3221.c b/drivers/hwmon/ina3221.c > > index cfe65ff01051..26f66f728b27 100644 > > --- a/drivers/hwmon/ina3221.c > > +++ b/drivers/hwmon/ina3221.c > > @@ -91,11 +91,13 @@ static const unsigned int register_channel[] = { > > * @regmap: Register map of the device > > * @fields: Register fields of the device > > * @shunt_resistors: Array of resistor values per channel > > + * @reg_config: Register value of INA3221_CONFIG > > */ > > struct ina3221_data { > > struct regmap *regmap; > > struct regmap_field *fields[F_MAX_FIELDS]; > > int shunt_resistors[INA3221_NUM_CHANNELS]; > > + u32 reg_config; > > }; > > > > static int ina3221_read_value(struct ina3221_data *ina, unsigned int reg, > > @@ -415,8 +417,59 @@ static int ina3221_probe(struct i2c_client *client, > > return PTR_ERR(hwmon_dev); > > } > > > > + dev_set_drvdata(dev, ina); > > + > > + return 0; > > +} > > + > > +#ifdef CONFIG_PM > > +static int ina3221_suspend(struct device *dev) > > +{ > > + struct ina3221_data *ina = dev_get_drvdata(dev); > > + int ret; > > + > > + /* Save config register value and enable cache-only */ > > + ret = regmap_read(ina->regmap, INA3221_CONFIG, &ina->reg_config); > > + if (ret) > > + return ret; > > + > > Would it make sense to explicitly disable all channels here ? For power saving? I could add it to v2. Thanks Nicolin ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2018-09-29 19:12 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2018-09-28 21:49 [PATCH 0/2] hwmon: ina3221: Add suspend and resume functions Nicolin Chen 2018-09-28 21:49 ` [PATCH 1/2] hwmon: ina3221: Add INA3221_CONFIG to volatile_table Nicolin Chen 2018-09-28 21:49 ` [PATCH 2/2] hwmon: ina3221: Add suspend and resume functions Nicolin Chen 2018-09-29 15:33 ` Guenter Roeck 2018-09-29 19:12 ` Nicolin Chen
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for NNTP newsgroup(s).