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path: root/drivers/hwmon/ina3221.c
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Diffstat (limited to 'drivers/hwmon/ina3221.c')
-rw-r--r--drivers/hwmon/ina3221.c198
1 files changed, 170 insertions, 28 deletions
diff --git a/drivers/hwmon/ina3221.c b/drivers/hwmon/ina3221.c
index d61688f04594..e90ccac8bebb 100644
--- a/drivers/hwmon/ina3221.c
+++ b/drivers/hwmon/ina3221.c
@@ -18,7 +18,9 @@
#include <linux/hwmon-sysfs.h>
#include <linux/i2c.h>
#include <linux/module.h>
+#include <linux/mutex.h>
#include <linux/of.h>
+#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#define INA3221_DRIVER_NAME "ina3221"
@@ -43,14 +45,25 @@
#define INA3221_CONFIG_MODE_SHUNT BIT(0)
#define INA3221_CONFIG_MODE_BUS BIT(1)
#define INA3221_CONFIG_MODE_CONTINUOUS BIT(2)
+#define INA3221_CONFIG_VSH_CT_SHIFT 3
+#define INA3221_CONFIG_VSH_CT_MASK GENMASK(5, 3)
+#define INA3221_CONFIG_VSH_CT(x) (((x) & GENMASK(5, 3)) >> 3)
+#define INA3221_CONFIG_VBUS_CT_SHIFT 6
+#define INA3221_CONFIG_VBUS_CT_MASK GENMASK(8, 6)
+#define INA3221_CONFIG_VBUS_CT(x) (((x) & GENMASK(8, 6)) >> 6)
+#define INA3221_CONFIG_CHs_EN_MASK GENMASK(14, 12)
#define INA3221_CONFIG_CHx_EN(x) BIT(14 - (x))
+#define INA3221_CONFIG_DEFAULT 0x7127
#define INA3221_RSHUNT_DEFAULT 10000
enum ina3221_fields {
/* Configuration */
F_RST,
+ /* Status Flags */
+ F_CVRF,
+
/* Alert Flags */
F_WF3, F_WF2, F_WF1,
F_CF3, F_CF2, F_CF1,
@@ -62,6 +75,7 @@ enum ina3221_fields {
static const struct reg_field ina3221_reg_fields[] = {
[F_RST] = REG_FIELD(INA3221_CONFIG, 15, 15),
+ [F_CVRF] = REG_FIELD(INA3221_MASK_ENABLE, 0, 0),
[F_WF3] = REG_FIELD(INA3221_MASK_ENABLE, 3, 3),
[F_WF2] = REG_FIELD(INA3221_MASK_ENABLE, 4, 4),
[F_WF1] = REG_FIELD(INA3221_MASK_ENABLE, 5, 5),
@@ -91,21 +105,48 @@ struct ina3221_input {
/**
* struct ina3221_data - device specific information
+ * @pm_dev: Device pointer for pm runtime
* @regmap: Register map of the device
* @fields: Register fields of the device
* @inputs: Array of channel input source specific structures
+ * @lock: mutex lock to serialize sysfs attribute accesses
* @reg_config: Register value of INA3221_CONFIG
*/
struct ina3221_data {
+ struct device *pm_dev;
struct regmap *regmap;
struct regmap_field *fields[F_MAX_FIELDS];
struct ina3221_input inputs[INA3221_NUM_CHANNELS];
+ struct mutex lock;
u32 reg_config;
};
static inline bool ina3221_is_enabled(struct ina3221_data *ina, int channel)
{
- return ina->reg_config & INA3221_CONFIG_CHx_EN(channel);
+ return pm_runtime_active(ina->pm_dev) &&
+ (ina->reg_config & INA3221_CONFIG_CHx_EN(channel));
+}
+
+/* Lookup table for Bus and Shunt conversion times in usec */
+static const u16 ina3221_conv_time[] = {
+ 140, 204, 332, 588, 1100, 2116, 4156, 8244,
+};
+
+static inline int ina3221_wait_for_data(struct ina3221_data *ina)
+{
+ 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 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);
+
+ /* Polling the CVRF bit to make sure read data is ready */
+ return regmap_field_read_poll_timeout(ina->fields[F_CVRF],
+ cvrf, cvrf, wait, 100000);
}
static int ina3221_read_value(struct ina3221_data *ina, unsigned int reg,
@@ -147,6 +188,10 @@ static int ina3221_read_in(struct device *dev, u32 attr, int channel, long *val)
if (!ina3221_is_enabled(ina, channel))
return -ENODATA;
+ ret = ina3221_wait_for_data(ina);
+ if (ret)
+ return ret;
+
ret = ina3221_read_value(ina, reg, &regval);
if (ret)
return ret;
@@ -186,6 +231,11 @@ static int ina3221_read_curr(struct device *dev, u32 attr,
case hwmon_curr_input:
if (!ina3221_is_enabled(ina, channel))
return -ENODATA;
+
+ ret = ina3221_wait_for_data(ina);
+ if (ret)
+ return ret;
+
/* fall through */
case hwmon_curr_crit:
case hwmon_curr_max:
@@ -200,6 +250,12 @@ static int ina3221_read_curr(struct device *dev, u32 attr,
return 0;
case hwmon_curr_crit_alarm:
case hwmon_curr_max_alarm:
+ /* No actual register read if channel is disabled */
+ if (!ina3221_is_enabled(ina, channel)) {
+ /* Return 0 for alert flags */
+ *val = 0;
+ return 0;
+ }
ret = regmap_field_read(ina->fields[reg], &regval);
if (ret)
return ret;
@@ -239,49 +295,100 @@ 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;
int ret;
config = enable ? mask : 0;
+ /* Bypass if enable status is not being changed */
+ if (config_old == config)
+ return 0;
+
+ /* For enabling routine, increase refcount and resume() at first */
+ if (enable) {
+ ret = pm_runtime_get_sync(ina->pm_dev);
+ if (ret < 0) {
+ dev_err(dev, "Failed to get PM runtime\n");
+ return ret;
+ }
+ }
+
/* Enable or disable the channel */
ret = regmap_update_bits(ina->regmap, INA3221_CONFIG, mask, config);
if (ret)
- return ret;
+ goto fail;
/* Cache the latest config register value */
ret = regmap_read(ina->regmap, INA3221_CONFIG, &ina->reg_config);
if (ret)
- return ret;
+ goto fail;
+
+ /* For disabling routine, decrease refcount or suspend() at last */
+ if (!enable)
+ pm_runtime_put_sync(ina->pm_dev);
return 0;
+
+fail:
+ if (enable) {
+ dev_err(dev, "Failed to enable channel %d: error %d\n",
+ channel, ret);
+ pm_runtime_put_sync(ina->pm_dev);
+ }
+
+ return ret;
}
static int ina3221_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
+ struct ina3221_data *ina = dev_get_drvdata(dev);
+ int ret;
+
+ mutex_lock(&ina->lock);
+
switch (type) {
case hwmon_in:
/* 0-align channel ID */
- return ina3221_read_in(dev, attr, channel - 1, val);
+ ret = ina3221_read_in(dev, attr, channel - 1, val);
+ break;
case hwmon_curr:
- return ina3221_read_curr(dev, attr, channel, val);
+ ret = ina3221_read_curr(dev, attr, channel, val);
+ break;
default:
- return -EOPNOTSUPP;
+ ret = -EOPNOTSUPP;
+ break;
}
+
+ mutex_unlock(&ina->lock);
+
+ return ret;
}
static int ina3221_write(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long val)
{
+ struct ina3221_data *ina = dev_get_drvdata(dev);
+ int ret;
+
+ mutex_lock(&ina->lock);
+
switch (type) {
case hwmon_in:
/* 0-align channel ID */
- return ina3221_write_enable(dev, channel - 1, val);
+ ret = ina3221_write_enable(dev, channel - 1, val);
+ break;
case hwmon_curr:
- return ina3221_write_curr(dev, attr, channel, val);
+ ret = ina3221_write_curr(dev, attr, channel, val);
+ break;
default:
- return -EOPNOTSUPP;
+ ret = -EOPNOTSUPP;
+ break;
}
+
+ mutex_unlock(&ina->lock);
+
+ return ret;
}
static int ina3221_read_string(struct device *dev, enum hwmon_sensor_types type,
@@ -469,10 +576,10 @@ static int ina3221_probe_child_from_dt(struct device *dev,
ret = of_property_read_u32(child, "reg", &val);
if (ret) {
- dev_err(dev, "missing reg property of %s\n", child->name);
+ dev_err(dev, "missing reg property of %pOFn\n", child);
return ret;
} else if (val > INA3221_CHANNEL3) {
- dev_err(dev, "invalid reg %d of %s\n", val, child->name);
+ dev_err(dev, "invalid reg %d of %pOFn\n", val, child);
return ret;
}
@@ -490,8 +597,8 @@ static int ina3221_probe_child_from_dt(struct device *dev,
/* Overwrite default shunt resistor value optionally */
if (!of_property_read_u32(child, "shunt-resistor-micro-ohms", &val)) {
if (val < 1 || val > INT_MAX) {
- dev_err(dev, "invalid shunt resistor value %u of %s\n",
- val, child->name);
+ dev_err(dev, "invalid shunt resistor value %u of %pOFn\n",
+ val, child);
return -EINVAL;
}
input->shunt_resistor = val;
@@ -556,37 +663,69 @@ static int ina3221_probe(struct i2c_client *client,
return ret;
}
- ret = regmap_field_write(ina->fields[F_RST], true);
- if (ret) {
- dev_err(dev, "Unable to reset device\n");
- return ret;
- }
-
- /* Sync config register after reset */
- ret = regmap_read(ina->regmap, INA3221_CONFIG, &ina->reg_config);
- if (ret)
- return ret;
+ /* The driver will be reset, so use reset value */
+ ina->reg_config = INA3221_CONFIG_DEFAULT;
/* Disable channels if their inputs are disconnected */
for (i = 0; i < INA3221_NUM_CHANNELS; i++) {
if (ina->inputs[i].disconnected)
ina->reg_config &= ~INA3221_CONFIG_CHx_EN(i);
}
- ret = regmap_write(ina->regmap, INA3221_CONFIG, ina->reg_config);
- if (ret)
- return ret;
+ ina->pm_dev = dev;
+ mutex_init(&ina->lock);
dev_set_drvdata(dev, ina);
+ /* Enable PM runtime -- status is suspended by default */
+ pm_runtime_enable(ina->pm_dev);
+
+ /* Initialize (resume) the device */
+ for (i = 0; i < INA3221_NUM_CHANNELS; i++) {
+ if (ina->inputs[i].disconnected)
+ continue;
+ /* Match the refcount with number of enabled channels */
+ ret = pm_runtime_get_sync(ina->pm_dev);
+ if (ret < 0)
+ goto fail;
+ }
+
hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, ina,
&ina3221_chip_info,
ina3221_groups);
if (IS_ERR(hwmon_dev)) {
dev_err(dev, "Unable to register hwmon device\n");
- return PTR_ERR(hwmon_dev);
+ ret = PTR_ERR(hwmon_dev);
+ goto fail;
}
return 0;
+
+fail:
+ pm_runtime_disable(ina->pm_dev);
+ pm_runtime_set_suspended(ina->pm_dev);
+ /* pm_runtime_put_noidle() will decrease the PM refcount until 0 */
+ for (i = 0; i < INA3221_NUM_CHANNELS; i++)
+ pm_runtime_put_noidle(ina->pm_dev);
+ mutex_destroy(&ina->lock);
+
+ return ret;
+}
+
+static int ina3221_remove(struct i2c_client *client)
+{
+ struct ina3221_data *ina = dev_get_drvdata(&client->dev);
+ int i;
+
+ pm_runtime_disable(ina->pm_dev);
+ pm_runtime_set_suspended(ina->pm_dev);
+
+ /* pm_runtime_put_noidle() will decrease the PM refcount until 0 */
+ for (i = 0; i < INA3221_NUM_CHANNELS; i++)
+ pm_runtime_put_noidle(ina->pm_dev);
+
+ mutex_destroy(&ina->lock);
+
+ return 0;
}
static int __maybe_unused ina3221_suspend(struct device *dev)
@@ -640,7 +779,9 @@ static int __maybe_unused ina3221_resume(struct device *dev)
}
static const struct dev_pm_ops ina3221_pm = {
- SET_SYSTEM_SLEEP_PM_OPS(ina3221_suspend, ina3221_resume)
+ SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
+ SET_RUNTIME_PM_OPS(ina3221_suspend, ina3221_resume, NULL)
};
static const struct of_device_id ina3221_of_match_table[] = {
@@ -657,6 +798,7 @@ MODULE_DEVICE_TABLE(i2c, ina3221_ids);
static struct i2c_driver ina3221_i2c_driver = {
.probe = ina3221_probe,
+ .remove = ina3221_remove,
.driver = {
.name = INA3221_DRIVER_NAME,
.of_match_table = ina3221_of_match_table,
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-18 03:41:07 +0300