* [PATCH v2 0/2] hwmon: (ina3221) Two changes for INA3221
@ 2019-04-17 23:12 Nicolin Chen
2019-04-17 23:12 ` [PATCH v2 1/2] hwmon: (ina3221) Do not read-back to cache reg_config Nicolin Chen
2019-04-17 23:12 ` [PATCH v2 2/2] hwmon: (ina3221) Add voltage conversion time settings Nicolin Chen
0 siblings, 2 replies; 5+ messages in thread
From: Nicolin Chen @ 2019-04-17 23:12 UTC (permalink / raw)
To: jdelvare, linux; +Cc: linux-hwmon, linux-kernel, corbet, linux-doc
Adding two changes for INA3221 HWMON driver.
Changlog
v1->v2:
* Added PATCH-1
* Rebased PATCH-2 (see detail of changelog in it)
Nicolin Chen (2):
hwmon: (ina3221) Do not read-back to cache reg_config
hwmon: (ina3221) Add voltage conversion time settings
Documentation/hwmon/ina3221 | 9 +++++
drivers/hwmon/ina3221.c | 77 +++++++++++++++++++++++++++++--------
2 files changed, 69 insertions(+), 17 deletions(-)
--
2.17.1
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v2 1/2] hwmon: (ina3221) Do not read-back to cache reg_config
2019-04-17 23:12 [PATCH v2 0/2] hwmon: (ina3221) Two changes for INA3221 Nicolin Chen
@ 2019-04-17 23:12 ` Nicolin Chen
2019-04-18 13:37 ` Guenter Roeck
2019-04-17 23:12 ` [PATCH v2 2/2] hwmon: (ina3221) Add voltage conversion time settings Nicolin Chen
1 sibling, 1 reply; 5+ messages in thread
From: Nicolin Chen @ 2019-04-17 23:12 UTC (permalink / raw)
To: jdelvare, linux; +Cc: linux-hwmon, linux-kernel, corbet, linux-doc
Reading back the CONFIG register increases an extra I2C
transaction. This's not necessary and could be replaced
with a local variable caching the register settings.
So this patch replaces two readback regmap_read() calls
with a tmp variable.
Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
---
drivers/hwmon/ina3221.c | 19 ++++++++++---------
1 file changed, 10 insertions(+), 9 deletions(-)
diff --git a/drivers/hwmon/ina3221.c b/drivers/hwmon/ina3221.c
index 74d39d212931..62040aac653c 100644
--- a/drivers/hwmon/ina3221.c
+++ b/drivers/hwmon/ina3221.c
@@ -309,21 +309,22 @@ static int ina3221_write_chip(struct device *dev, u32 attr, long val)
{
struct ina3221_data *ina = dev_get_drvdata(dev);
int ret, idx;
+ u32 tmp;
switch (attr) {
case hwmon_chip_samples:
idx = find_closest(val, ina3221_avg_samples,
ARRAY_SIZE(ina3221_avg_samples));
- ret = regmap_update_bits(ina->regmap, INA3221_CONFIG,
- INA3221_CONFIG_AVG_MASK,
- idx << INA3221_CONFIG_AVG_SHIFT);
+ tmp = (ina->reg_config & ~INA3221_CONFIG_AVG_MASK) |
+ (idx << INA3221_CONFIG_AVG_SHIFT);
+ ret = regmap_write(ina->regmap, INA3221_CONFIG, tmp);
if (ret)
return ret;
/* Update reg_config accordingly */
- return regmap_read(ina->regmap, INA3221_CONFIG,
- &ina->reg_config);
+ ina->reg_config = tmp;
+ return 0;
default:
return -EOPNOTSUPP;
}
@@ -359,6 +360,7 @@ static int ina3221_write_enable(struct device *dev, int channel, bool enable)
struct ina3221_data *ina = dev_get_drvdata(dev);
u16 config, mask = INA3221_CONFIG_CHx_EN(channel);
u16 config_old = ina->reg_config & mask;
+ u32 tmp;
int ret;
config = enable ? mask : 0;
@@ -377,14 +379,13 @@ static int ina3221_write_enable(struct device *dev, int channel, bool enable)
}
/* Enable or disable the channel */
- ret = regmap_update_bits(ina->regmap, INA3221_CONFIG, mask, config);
+ tmp = (ina->reg_config & ~mask) | (config & mask);
+ ret = regmap_write(ina->regmap, INA3221_CONFIG, tmp);
if (ret)
goto fail;
/* Cache the latest config register value */
- ret = regmap_read(ina->regmap, INA3221_CONFIG, &ina->reg_config);
- if (ret)
- goto fail;
+ ina->reg_config = tmp;
/* For disabling routine, decrease refcount or suspend() at last */
if (!enable)
--
2.17.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH v2 2/2] hwmon: (ina3221) Add voltage conversion time settings
2019-04-17 23:12 [PATCH v2 0/2] hwmon: (ina3221) Two changes for INA3221 Nicolin Chen
2019-04-17 23:12 ` [PATCH v2 1/2] hwmon: (ina3221) Do not read-back to cache reg_config Nicolin Chen
@ 2019-04-17 23:12 ` Nicolin Chen
2019-04-18 13:45 ` Guenter Roeck
1 sibling, 1 reply; 5+ messages in thread
From: Nicolin Chen @ 2019-04-17 23:12 UTC (permalink / raw)
To: jdelvare, linux; +Cc: linux-hwmon, linux-kernel, corbet, linux-doc
The CONFIG register has two 3-bit fields for conversion time
settings of Bus-voltage and Shunt-voltage, respectively. The
conversion settings, along with averaging mode, allow users
to optimize available timing requirement.
This patch adds an 'update_interval' sysfs node through the
hwmon_chip_info of hwmon core. It reflects a total hardware
conversion time:
samples * channels * (Bus + Shunt conversion times)
Though INA3221 supports different conversion time setups for
Bus and Shunt voltages, this patch only adds the support of
a unified setting for both conversion times, by dividing the
conversion time into two equal values.
Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
---
Changelog
v1->v2:
* Merged two adjacent calls of regmap_update_bits().
* Replaced CONFIG register read-back with tmp variable
Documentation/hwmon/ina3221 | 9 ++++++
drivers/hwmon/ina3221.c | 58 ++++++++++++++++++++++++++++++++-----
2 files changed, 59 insertions(+), 8 deletions(-)
diff --git a/Documentation/hwmon/ina3221 b/Documentation/hwmon/ina3221
index ed3f22769d4b..3b05170112f0 100644
--- a/Documentation/hwmon/ina3221
+++ b/Documentation/hwmon/ina3221
@@ -38,3 +38,12 @@ in[456]_input Shunt voltage(uV) for channels 1, 2, and 3 respectively
samples Number of samples using in the averaging mode.
Supports the list of number of samples:
1, 4, 16, 64, 128, 256, 512, 1024
+update_interval Data conversion time in millisecond, following:
+ update_interval = C x S x (BC + SC)
+ C: number of enabled channels
+ S: number of samples
+ BC: bus-voltage conversion time in millisecond
+ SC: shunt-voltage conversion time in millisecond
+ Affects both Bus- and Shunt-voltage conversion time.
+ Note that setting update_interval to 0ms sets both BC
+ and SC to 140 us (minimum conversion time).
diff --git a/drivers/hwmon/ina3221.c b/drivers/hwmon/ina3221.c
index 62040aac653c..e0637fed9585 100644
--- a/drivers/hwmon/ina3221.c
+++ b/drivers/hwmon/ina3221.c
@@ -144,19 +144,37 @@ static const int ina3221_avg_samples[] = {
1, 4, 16, 64, 128, 256, 512, 1024,
};
-static inline int ina3221_wait_for_data(struct ina3221_data *ina)
+/* Converting update_interval in msec to conversion time in usec */
+static inline u32 ina3221_interval_ms_to_conv_time(u16 config, int interval)
+{
+ u32 channels = hweight16(config & INA3221_CONFIG_CHs_EN_MASK);
+ u32 samples_idx = INA3221_CONFIG_AVG(config);
+ u32 samples = ina3221_avg_samples[samples_idx];
+
+ /* Bisect the result to Bus and Shunt conversion times */
+ return DIV_ROUND_CLOSEST(interval * 1000 / 2, channels * samples);
+}
+
+/* Converting CONFIG register value to update_interval in usec */
+static inline u32 ina3221_reg_to_interval_us(u16 config)
{
- u32 channels = hweight16(ina->reg_config & INA3221_CONFIG_CHs_EN_MASK);
- u32 vbus_ct_idx = INA3221_CONFIG_VBUS_CT(ina->reg_config);
- u32 vsh_ct_idx = INA3221_CONFIG_VSH_CT(ina->reg_config);
- u32 samples_idx = INA3221_CONFIG_AVG(ina->reg_config);
+ u32 channels = hweight16(config & INA3221_CONFIG_CHs_EN_MASK);
+ u32 vbus_ct_idx = INA3221_CONFIG_VBUS_CT(config);
+ u32 vsh_ct_idx = INA3221_CONFIG_VSH_CT(config);
+ u32 samples_idx = INA3221_CONFIG_AVG(config);
u32 samples = ina3221_avg_samples[samples_idx];
u32 vbus_ct = ina3221_conv_time[vbus_ct_idx];
u32 vsh_ct = ina3221_conv_time[vsh_ct_idx];
- u32 wait, cvrf;
/* Calculate total conversion time */
- wait = channels * (vbus_ct + vsh_ct) * samples;
+ return channels * (vbus_ct + vsh_ct) * samples;
+}
+
+static inline int ina3221_wait_for_data(struct ina3221_data *ina)
+{
+ u32 wait, cvrf;
+
+ wait = ina3221_reg_to_interval_us(ina->reg_config);
/* Polling the CVRF bit to make sure read data is ready */
return regmap_field_read_poll_timeout(ina->fields[F_CVRF],
@@ -197,6 +215,11 @@ static int ina3221_read_chip(struct device *dev, u32 attr, long *val)
regval = INA3221_CONFIG_AVG(ina->reg_config);
*val = ina3221_avg_samples[regval];
return 0;
+ case hwmon_chip_update_interval:
+ /* Return in msec */
+ *val = ina3221_reg_to_interval_us(ina->reg_config);
+ *val = DIV_ROUND_CLOSEST(*val, 1000);
+ return 0;
default:
return -EOPNOTSUPP;
}
@@ -322,6 +345,23 @@ static int ina3221_write_chip(struct device *dev, u32 attr, long val)
if (ret)
return ret;
+ /* Update reg_config accordingly */
+ ina->reg_config = tmp;
+ return 0;
+ case hwmon_chip_update_interval:
+ tmp = ina3221_interval_ms_to_conv_time(ina->reg_config, val);
+ idx = find_closest(tmp, ina3221_conv_time,
+ ARRAY_SIZE(ina3221_conv_time));
+
+ /* Update Bus and Shunt voltage conversion times */
+ tmp = INA3221_CONFIG_VBUS_CT_MASK | INA3221_CONFIG_VSH_CT_MASK;
+ tmp = (ina->reg_config & ~tmp) |
+ (idx << INA3221_CONFIG_VBUS_CT_SHIFT) |
+ (idx << INA3221_CONFIG_VSH_CT_SHIFT);
+ ret = regmap_write(ina->regmap, INA3221_CONFIG, tmp);
+ if (ret)
+ return ret;
+
/* Update reg_config accordingly */
ina->reg_config = tmp;
return 0;
@@ -483,6 +523,7 @@ static umode_t ina3221_is_visible(const void *drvdata,
case hwmon_chip:
switch (attr) {
case hwmon_chip_samples:
+ case hwmon_chip_update_interval:
return 0644;
default:
return 0;
@@ -528,7 +569,8 @@ static umode_t ina3221_is_visible(const void *drvdata,
static const struct hwmon_channel_info *ina3221_info[] = {
HWMON_CHANNEL_INFO(chip,
- HWMON_C_SAMPLES),
+ HWMON_C_SAMPLES,
+ HWMON_C_UPDATE_INTERVAL),
HWMON_CHANNEL_INFO(in,
/* 0: dummy, skipped in is_visible */
HWMON_I_INPUT,
--
2.17.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v2 1/2] hwmon: (ina3221) Do not read-back to cache reg_config
2019-04-17 23:12 ` [PATCH v2 1/2] hwmon: (ina3221) Do not read-back to cache reg_config Nicolin Chen
@ 2019-04-18 13:37 ` Guenter Roeck
0 siblings, 0 replies; 5+ messages in thread
From: Guenter Roeck @ 2019-04-18 13:37 UTC (permalink / raw)
To: Nicolin Chen; +Cc: jdelvare, linux-hwmon, linux-kernel, corbet, linux-doc
On Wed, Apr 17, 2019 at 04:12:09PM -0700, Nicolin Chen wrote:
> Reading back the CONFIG register increases an extra I2C
> transaction. This's not necessary and could be replaced
> with a local variable caching the register settings.
>
> So this patch replaces two readback regmap_read() calls
> with a tmp variable.
>
> Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Applied to hwmon-next.
Thanks,
Guenter
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v2 2/2] hwmon: (ina3221) Add voltage conversion time settings
2019-04-17 23:12 ` [PATCH v2 2/2] hwmon: (ina3221) Add voltage conversion time settings Nicolin Chen
@ 2019-04-18 13:45 ` Guenter Roeck
0 siblings, 0 replies; 5+ messages in thread
From: Guenter Roeck @ 2019-04-18 13:45 UTC (permalink / raw)
To: Nicolin Chen; +Cc: jdelvare, linux-hwmon, linux-kernel, corbet, linux-doc
On Wed, Apr 17, 2019 at 04:12:10PM -0700, Nicolin Chen wrote:
> The CONFIG register has two 3-bit fields for conversion time
> settings of Bus-voltage and Shunt-voltage, respectively. The
> conversion settings, along with averaging mode, allow users
> to optimize available timing requirement.
>
> This patch adds an 'update_interval' sysfs node through the
> hwmon_chip_info of hwmon core. It reflects a total hardware
> conversion time:
> samples * channels * (Bus + Shunt conversion times)
>
> Though INA3221 supports different conversion time setups for
> Bus and Shunt voltages, this patch only adds the support of
> a unified setting for both conversion times, by dividing the
> conversion time into two equal values.
>
> Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Applied to -next. I had to update the documentation for the .rst formatting
changes. Hope I got it right.
Thanks,
Guenter
> ---
> Changelog
> v1->v2:
> * Merged two adjacent calls of regmap_update_bits().
> * Replaced CONFIG register read-back with tmp variable
>
> Documentation/hwmon/ina3221 | 9 ++++++
> drivers/hwmon/ina3221.c | 58 ++++++++++++++++++++++++++++++++-----
> 2 files changed, 59 insertions(+), 8 deletions(-)
>
> diff --git a/Documentation/hwmon/ina3221 b/Documentation/hwmon/ina3221
> index ed3f22769d4b..3b05170112f0 100644
> --- a/Documentation/hwmon/ina3221
> +++ b/Documentation/hwmon/ina3221
> @@ -38,3 +38,12 @@ in[456]_input Shunt voltage(uV) for channels 1, 2, and 3 respectively
> samples Number of samples using in the averaging mode.
> Supports the list of number of samples:
> 1, 4, 16, 64, 128, 256, 512, 1024
> +update_interval Data conversion time in millisecond, following:
> + update_interval = C x S x (BC + SC)
> + C: number of enabled channels
> + S: number of samples
> + BC: bus-voltage conversion time in millisecond
> + SC: shunt-voltage conversion time in millisecond
> + Affects both Bus- and Shunt-voltage conversion time.
> + Note that setting update_interval to 0ms sets both BC
> + and SC to 140 us (minimum conversion time).
> diff --git a/drivers/hwmon/ina3221.c b/drivers/hwmon/ina3221.c
> index 62040aac653c..e0637fed9585 100644
> --- a/drivers/hwmon/ina3221.c
> +++ b/drivers/hwmon/ina3221.c
> @@ -144,19 +144,37 @@ static const int ina3221_avg_samples[] = {
> 1, 4, 16, 64, 128, 256, 512, 1024,
> };
>
> -static inline int ina3221_wait_for_data(struct ina3221_data *ina)
> +/* Converting update_interval in msec to conversion time in usec */
> +static inline u32 ina3221_interval_ms_to_conv_time(u16 config, int interval)
> +{
> + u32 channels = hweight16(config & INA3221_CONFIG_CHs_EN_MASK);
> + u32 samples_idx = INA3221_CONFIG_AVG(config);
> + u32 samples = ina3221_avg_samples[samples_idx];
> +
> + /* Bisect the result to Bus and Shunt conversion times */
> + return DIV_ROUND_CLOSEST(interval * 1000 / 2, channels * samples);
> +}
> +
> +/* Converting CONFIG register value to update_interval in usec */
> +static inline u32 ina3221_reg_to_interval_us(u16 config)
> {
> - u32 channels = hweight16(ina->reg_config & INA3221_CONFIG_CHs_EN_MASK);
> - u32 vbus_ct_idx = INA3221_CONFIG_VBUS_CT(ina->reg_config);
> - u32 vsh_ct_idx = INA3221_CONFIG_VSH_CT(ina->reg_config);
> - u32 samples_idx = INA3221_CONFIG_AVG(ina->reg_config);
> + u32 channels = hweight16(config & INA3221_CONFIG_CHs_EN_MASK);
> + u32 vbus_ct_idx = INA3221_CONFIG_VBUS_CT(config);
> + u32 vsh_ct_idx = INA3221_CONFIG_VSH_CT(config);
> + u32 samples_idx = INA3221_CONFIG_AVG(config);
> u32 samples = ina3221_avg_samples[samples_idx];
> u32 vbus_ct = ina3221_conv_time[vbus_ct_idx];
> u32 vsh_ct = ina3221_conv_time[vsh_ct_idx];
> - u32 wait, cvrf;
>
> /* Calculate total conversion time */
> - wait = channels * (vbus_ct + vsh_ct) * samples;
> + return channels * (vbus_ct + vsh_ct) * samples;
> +}
> +
> +static inline int ina3221_wait_for_data(struct ina3221_data *ina)
> +{
> + u32 wait, cvrf;
> +
> + wait = ina3221_reg_to_interval_us(ina->reg_config);
>
> /* Polling the CVRF bit to make sure read data is ready */
> return regmap_field_read_poll_timeout(ina->fields[F_CVRF],
> @@ -197,6 +215,11 @@ static int ina3221_read_chip(struct device *dev, u32 attr, long *val)
> regval = INA3221_CONFIG_AVG(ina->reg_config);
> *val = ina3221_avg_samples[regval];
> return 0;
> + case hwmon_chip_update_interval:
> + /* Return in msec */
> + *val = ina3221_reg_to_interval_us(ina->reg_config);
> + *val = DIV_ROUND_CLOSEST(*val, 1000);
> + return 0;
> default:
> return -EOPNOTSUPP;
> }
> @@ -322,6 +345,23 @@ static int ina3221_write_chip(struct device *dev, u32 attr, long val)
> if (ret)
> return ret;
>
> + /* Update reg_config accordingly */
> + ina->reg_config = tmp;
> + return 0;
> + case hwmon_chip_update_interval:
> + tmp = ina3221_interval_ms_to_conv_time(ina->reg_config, val);
> + idx = find_closest(tmp, ina3221_conv_time,
> + ARRAY_SIZE(ina3221_conv_time));
> +
> + /* Update Bus and Shunt voltage conversion times */
> + tmp = INA3221_CONFIG_VBUS_CT_MASK | INA3221_CONFIG_VSH_CT_MASK;
> + tmp = (ina->reg_config & ~tmp) |
> + (idx << INA3221_CONFIG_VBUS_CT_SHIFT) |
> + (idx << INA3221_CONFIG_VSH_CT_SHIFT);
> + ret = regmap_write(ina->regmap, INA3221_CONFIG, tmp);
> + if (ret)
> + return ret;
> +
> /* Update reg_config accordingly */
> ina->reg_config = tmp;
> return 0;
> @@ -483,6 +523,7 @@ static umode_t ina3221_is_visible(const void *drvdata,
> case hwmon_chip:
> switch (attr) {
> case hwmon_chip_samples:
> + case hwmon_chip_update_interval:
> return 0644;
> default:
> return 0;
> @@ -528,7 +569,8 @@ static umode_t ina3221_is_visible(const void *drvdata,
>
> static const struct hwmon_channel_info *ina3221_info[] = {
> HWMON_CHANNEL_INFO(chip,
> - HWMON_C_SAMPLES),
> + HWMON_C_SAMPLES,
> + HWMON_C_UPDATE_INTERVAL),
> HWMON_CHANNEL_INFO(in,
> /* 0: dummy, skipped in is_visible */
> HWMON_I_INPUT,
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2019-04-18 13:45 UTC | newest]
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2019-04-17 23:12 [PATCH v2 0/2] hwmon: (ina3221) Two changes for INA3221 Nicolin Chen
2019-04-17 23:12 ` [PATCH v2 1/2] hwmon: (ina3221) Do not read-back to cache reg_config Nicolin Chen
2019-04-18 13:37 ` Guenter Roeck
2019-04-17 23:12 ` [PATCH v2 2/2] hwmon: (ina3221) Add voltage conversion time settings Nicolin Chen
2019-04-18 13:45 ` Guenter Roeck
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