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Message-Id: <20241205-power-supply-extensions-v5-4-f0f996db4347@weissschuh.net>
Date: Thu, 05 Dec 2024 21:46:38 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Sebastian Reichel <sre@...nel.org>, Armin Wolf <W_Armin@....de>,
Hans de Goede <hdegoede@...hat.com>,
Thomas Weißschuh <thomas@...ssschuh.net>,
Benson Leung <bleung@...omium.org>, Guenter Roeck <groeck@...omium.org>,
"Rafael J. Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
chrome-platform@...ts.linux.dev, linux-acpi@...r.kernel.org,
Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH v5 4/4] power: supply: cros_charge-control: implement a
power supply extension
Power supply extensions provide an easier mechanism to implement
additional properties for existing power supplies.
Use that instead of reimplementing the sysfs attributes manually.
Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
drivers/power/supply/cros_charge-control.c | 217 ++++++++++++-----------------
1 file changed, 88 insertions(+), 129 deletions(-)
diff --git a/drivers/power/supply/cros_charge-control.c b/drivers/power/supply/cros_charge-control.c
index 17c53591ce197d08d97c94d3d4359a282026dd7d..7f914a65f88f8ea57bf01c334d25d9b8ebaa2de7 100644
--- a/drivers/power/supply/cros_charge-control.c
+++ b/drivers/power/supply/cros_charge-control.c
@@ -18,13 +18,6 @@
BIT(POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE) | \
BIT(POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE))
-enum CROS_CHCTL_ATTR {
- CROS_CHCTL_ATTR_START_THRESHOLD,
- CROS_CHCTL_ATTR_END_THRESHOLD,
- CROS_CHCTL_ATTR_CHARGE_BEHAVIOUR,
- _CROS_CHCTL_ATTR_COUNT
-};
-
/*
* Semantics of data *returned* from the EC API and Linux sysfs differ
* slightly, also the v1 API can not return any data.
@@ -41,13 +34,7 @@ struct cros_chctl_priv {
struct power_supply *hooked_battery;
u8 cmd_version;
- /* The callbacks need to access this priv structure.
- * As neither the struct device nor power_supply are under the drivers
- * control, embed the attributes within priv to use with container_of().
- */
- struct device_attribute device_attrs[_CROS_CHCTL_ATTR_COUNT];
- struct attribute *attributes[_CROS_CHCTL_ATTR_COUNT];
- struct attribute_group group;
+ const struct power_supply_ext *psy_ext;
enum power_supply_charge_behaviour current_behaviour;
u8 current_start_threshold, current_end_threshold;
@@ -114,124 +101,104 @@ static int cros_chctl_configure_ec(struct cros_chctl_priv *priv)
return cros_chctl_send_charge_control_cmd(priv->cros_ec, priv->cmd_version, &req);
}
-static struct cros_chctl_priv *cros_chctl_attr_to_priv(struct attribute *attr,
- enum CROS_CHCTL_ATTR idx)
-{
- struct device_attribute *dev_attr = container_of(attr, struct device_attribute, attr);
-
- return container_of(dev_attr, struct cros_chctl_priv, device_attrs[idx]);
-}
+static const enum power_supply_property cros_chctl_psy_ext_props[] = {
+ POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR, /* has to be first for cros_chctl_psy_ext_v1 */
+ POWER_SUPPLY_PROP_CHARGE_CONTROL_START_THRESHOLD,
+ POWER_SUPPLY_PROP_CHARGE_CONTROL_END_THRESHOLD,
+};
-static ssize_t cros_chctl_store_threshold(struct device *dev, struct cros_chctl_priv *priv,
- int is_end_threshold, const char *buf, size_t count)
+static int cros_chctl_psy_ext_get_prop(struct power_supply *psy,
+ const struct power_supply_ext *ext,
+ void *data,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
{
- int ret, val;
+ struct cros_chctl_priv *priv = data;
- ret = kstrtoint(buf, 10, &val);
- if (ret < 0)
- return ret;
- if (val < 0 || val > 100)
+ switch (psp) {
+ case POWER_SUPPLY_PROP_CHARGE_CONTROL_START_THRESHOLD:
+ val->intval = priv->current_start_threshold;
+ return 0;
+ case POWER_SUPPLY_PROP_CHARGE_CONTROL_END_THRESHOLD:
+ val->intval = priv->current_end_threshold;
+ return 0;
+ case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
+ val->intval = priv->current_behaviour;
+ return 0;
+ default:
return -EINVAL;
-
- if (is_end_threshold) {
- if (val <= priv->current_start_threshold)
- return -EINVAL;
- priv->current_end_threshold = val;
- } else {
- if (val >= priv->current_end_threshold)
- return -EINVAL;
- priv->current_start_threshold = val;
}
-
- if (priv->current_behaviour == POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO) {
- ret = cros_chctl_configure_ec(priv);
- if (ret < 0)
- return ret;
- }
-
- return count;
-}
-
-static ssize_t charge_control_start_threshold_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct cros_chctl_priv *priv = cros_chctl_attr_to_priv(&attr->attr,
- CROS_CHCTL_ATTR_START_THRESHOLD);
-
- return sysfs_emit(buf, "%u\n", (unsigned int)priv->current_start_threshold);
-}
-
-static ssize_t charge_control_start_threshold_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- struct cros_chctl_priv *priv = cros_chctl_attr_to_priv(&attr->attr,
- CROS_CHCTL_ATTR_START_THRESHOLD);
-
- return cros_chctl_store_threshold(dev, priv, 0, buf, count);
-}
-
-static ssize_t charge_control_end_threshold_show(struct device *dev, struct device_attribute *attr,
- char *buf)
-{
- struct cros_chctl_priv *priv = cros_chctl_attr_to_priv(&attr->attr,
- CROS_CHCTL_ATTR_END_THRESHOLD);
-
- return sysfs_emit(buf, "%u\n", (unsigned int)priv->current_end_threshold);
-}
-
-static ssize_t charge_control_end_threshold_store(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t count)
-{
- struct cros_chctl_priv *priv = cros_chctl_attr_to_priv(&attr->attr,
- CROS_CHCTL_ATTR_END_THRESHOLD);
-
- return cros_chctl_store_threshold(dev, priv, 1, buf, count);
}
-static ssize_t charge_behaviour_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
- struct cros_chctl_priv *priv = cros_chctl_attr_to_priv(&attr->attr,
- CROS_CHCTL_ATTR_CHARGE_BEHAVIOUR);
-
- return power_supply_charge_behaviour_show(dev, EC_CHARGE_CONTROL_BEHAVIOURS,
- priv->current_behaviour, buf);
-}
-static ssize_t charge_behaviour_store(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t count)
+static int cros_chctl_psy_ext_set_prop(struct power_supply *psy,
+ const struct power_supply_ext *ext,
+ void *data,
+ enum power_supply_property psp,
+ const union power_supply_propval *val)
{
- struct cros_chctl_priv *priv = cros_chctl_attr_to_priv(&attr->attr,
- CROS_CHCTL_ATTR_CHARGE_BEHAVIOUR);
+ struct cros_chctl_priv *priv = data;
int ret;
- ret = power_supply_charge_behaviour_parse(EC_CHARGE_CONTROL_BEHAVIOURS, buf);
- if (ret < 0)
- return ret;
-
- priv->current_behaviour = ret;
+ switch (psp) {
+ case POWER_SUPPLY_PROP_CHARGE_CONTROL_START_THRESHOLD:
+ case POWER_SUPPLY_PROP_CHARGE_CONTROL_END_THRESHOLD:
+ if (val->intval < 0 || val->intval > 100)
+ return -EINVAL;
- ret = cros_chctl_configure_ec(priv);
- if (ret < 0)
- return ret;
+ if (psp == POWER_SUPPLY_PROP_CHARGE_CONTROL_END_THRESHOLD) {
+ if (val->intval <= priv->current_start_threshold)
+ return -EINVAL;
+ priv->current_end_threshold = val->intval;
+ } else {
+ if (val->intval >= priv->current_end_threshold)
+ return -EINVAL;
+ priv->current_start_threshold = val->intval;
+ }
+
+ if (priv->current_behaviour == POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO) {
+ ret = cros_chctl_configure_ec(priv);
+ if (ret < 0)
+ return ret;
+ }
- return count;
+ return 0;
+ case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
+ priv->current_behaviour = val->intval;
+ ret = cros_chctl_configure_ec(priv);
+ if (ret < 0)
+ return ret;
+ return 0;
+ default:
+ return -EINVAL;
+ }
}
-static umode_t cros_chtl_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
+static int cros_chctl_psy_prop_is_writeable(struct power_supply *psy,
+ const struct power_supply_ext *ext,
+ void *data,
+ enum power_supply_property psp)
{
- struct cros_chctl_priv *priv = cros_chctl_attr_to_priv(attr, n);
+ return true;
+}
- if (priv->cmd_version < 2) {
- if (n == CROS_CHCTL_ATTR_START_THRESHOLD)
- return 0;
- if (n == CROS_CHCTL_ATTR_END_THRESHOLD)
- return 0;
- }
+static const struct power_supply_ext cros_chctl_psy_ext = {
+ .properties = cros_chctl_psy_ext_props,
+ .num_properties = ARRAY_SIZE(cros_chctl_psy_ext_props),
+ .charge_behaviours = EC_CHARGE_CONTROL_BEHAVIOURS,
+ .get_property = cros_chctl_psy_ext_get_prop,
+ .set_property = cros_chctl_psy_ext_set_prop,
+ .property_is_writeable = cros_chctl_psy_prop_is_writeable,
+};
- return attr->mode;
-}
+static const struct power_supply_ext cros_chctl_psy_ext_v1 = {
+ .properties = cros_chctl_psy_ext_props,
+ .num_properties = 1,
+ .charge_behaviours = EC_CHARGE_CONTROL_BEHAVIOURS,
+ .get_property = cros_chctl_psy_ext_get_prop,
+ .set_property = cros_chctl_psy_ext_set_prop,
+ .property_is_writeable = cros_chctl_psy_prop_is_writeable,
+};
static int cros_chctl_add_battery(struct power_supply *battery, struct acpi_battery_hook *hook)
{
@@ -241,7 +208,7 @@ static int cros_chctl_add_battery(struct power_supply *battery, struct acpi_batt
return 0;
priv->hooked_battery = battery;
- return device_add_group(&battery->dev, &priv->group);
+ return power_supply_register_extension(battery, priv->psy_ext, priv);
}
static int cros_chctl_remove_battery(struct power_supply *battery, struct acpi_battery_hook *hook)
@@ -249,7 +216,7 @@ static int cros_chctl_remove_battery(struct power_supply *battery, struct acpi_b
struct cros_chctl_priv *priv = container_of(hook, struct cros_chctl_priv, battery_hook);
if (priv->hooked_battery == battery) {
- device_remove_group(&battery->dev, &priv->group);
+ power_supply_unregister_extension(battery, priv->psy_ext);
priv->hooked_battery = NULL;
}
@@ -275,7 +242,6 @@ static int cros_chctl_probe(struct platform_device *pdev)
struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent);
struct cros_ec_device *cros_ec = ec_dev->ec_dev;
struct cros_chctl_priv *priv;
- size_t i;
int ret;
ret = cros_chctl_fwk_charge_control_versions(cros_ec);
@@ -305,18 +271,11 @@ static int cros_chctl_probe(struct platform_device *pdev)
dev_dbg(dev, "Command version: %u\n", (unsigned int)priv->cmd_version);
priv->cros_ec = cros_ec;
- priv->device_attrs[CROS_CHCTL_ATTR_START_THRESHOLD] =
- (struct device_attribute)__ATTR_RW(charge_control_start_threshold);
- priv->device_attrs[CROS_CHCTL_ATTR_END_THRESHOLD] =
- (struct device_attribute)__ATTR_RW(charge_control_end_threshold);
- priv->device_attrs[CROS_CHCTL_ATTR_CHARGE_BEHAVIOUR] =
- (struct device_attribute)__ATTR_RW(charge_behaviour);
- for (i = 0; i < _CROS_CHCTL_ATTR_COUNT; i++) {
- sysfs_attr_init(&priv->device_attrs[i].attr);
- priv->attributes[i] = &priv->device_attrs[i].attr;
- }
- priv->group.is_visible = cros_chtl_attr_is_visible;
- priv->group.attrs = priv->attributes;
+
+ if (priv->cmd_version == 1)
+ priv->psy_ext = &cros_chctl_psy_ext_v1;
+ else
+ priv->psy_ext = &cros_chctl_psy_ext;
priv->battery_hook.name = dev_name(dev);
priv->battery_hook.add_battery = cros_chctl_add_battery;
--
2.47.1
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