[PATCH v2 19/20] extcon: intel-cht-wc: Add support for registering a power_supply class-device

Hans de Goede
2021-11-14T17:07:17Z

The bq25890 used on the Yogabook YB1-X90 / -X91 models relies on
the extcon-driver's BC-1.2 charger detection, and the bq25890 driver
expect this info to be available through a parent power_supply
class-device which models the detected charger (idem to how the Type-C
TCPM code registers a power_supply classdev for the connected charger).

Add support for registering the power_supply class-device expected
by this setup.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
drivers/extcon/extcon-intel-cht-wc.c | 83 ++++++++++++++++++++++++++++
1 file changed, 83 insertions(+)

diff --git a/drivers/extcon/extcon-intel-cht-wc.c b/drivers/extcon/extcon-intel-cht-wc.c
index f2b93a99a625..1030610a3494 100644
--- a/drivers/extcon/extcon-intel-cht-wc.c
+++ b/drivers/extcon/extcon-intel-cht-wc.c
@@ -14,6 +14,7 @@
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
+#include <linux/power_supply.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
@@ -106,6 +107,8 @@ struct cht_wc_extcon_data {
struct extcon_dev *edev;
struct usb_role_switch *role_sw;
struct regulator *vbus_boost;
+ struct power_supply *psy;
+ enum power_supply_usb_type usb_type;
unsigned int previous_cable;
bool usb_host;
bool vbus_boost_enabled;
@@ -170,18 +173,23 @@ static int cht_wc_extcon_get_charger(struct cht_wc_extcon_data *ext,
dev_warn(ext->dev,
"Unhandled charger type %d, defaulting to SDP\n",
ret);
+ ext->usb_type = POWER_SUPPLY_USB_TYPE_SDP;
return EXTCON_CHG_USB_SDP;
case CHT_WC_USBSRC_TYPE_SDP:
case CHT_WC_USBSRC_TYPE_FLOATING:
case CHT_WC_USBSRC_TYPE_OTHER:
+ ext->usb_type = POWER_SUPPLY_USB_TYPE_SDP;
return EXTCON_CHG_USB_SDP;
case CHT_WC_USBSRC_TYPE_CDP:
+ ext->usb_type = POWER_SUPPLY_USB_TYPE_CDP;
return EXTCON_CHG_USB_CDP;
case CHT_WC_USBSRC_TYPE_DCP:
case CHT_WC_USBSRC_TYPE_DCP_EXTPHY:
case CHT_WC_USBSRC_TYPE_MHL: /* MHL2+ delivers upto 2A, treat as DCP */
+ ext->usb_type = POWER_SUPPLY_USB_TYPE_DCP;
return EXTCON_CHG_USB_DCP;
case CHT_WC_USBSRC_TYPE_ACA:
+ ext->usb_type = POWER_SUPPLY_USB_TYPE_ACA;
return EXTCON_CHG_USB_ACA;
}
}
@@ -266,6 +274,8 @@ static void cht_wc_extcon_pwrsrc_event(struct cht_wc_extcon_data *ext)
bool ignore_get_charger_errors = ext->usb_host;
enum usb_role role;

+ ext->usb_type = POWER_SUPPLY_USB_TYPE_UNKNOWN;
+
ret = regmap_read(ext->regmap, CHT_WC_PWRSRC_STS, &pwrsrc_sts);
if (ret) {
dev_err(ext->dev, "Error reading pwrsrc status: %d\n", ret);
@@ -320,6 +330,9 @@ static void cht_wc_extcon_pwrsrc_event(struct cht_wc_extcon_data *ext)
ret = usb_role_switch_set_role(ext->role_sw, role);
if (ret)
dev_err(ext->dev, "Error setting USB-role: %d\n", ret);
+
+ if (ext->psy)
+ power_supply_changed(ext->psy);
}

static irqreturn_t cht_wc_extcon_isr(int irq, void *data)
@@ -420,6 +433,61 @@ static int cht_wc_extcon_get_role_sw_and_regulator(struct cht_wc_extcon_data *ex
return 0;
}

+static int cht_wc_extcon_psy_get_prop(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct cht_wc_extcon_data *ext = power_supply_get_drvdata(psy);
+ int ret = 0;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_USB_TYPE:
+ val->intval = ext->usb_type;
+ break;
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = ext->usb_type ? 1 : 0;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static const enum power_supply_usb_type cht_wc_extcon_psy_usb_types[] = {
+ POWER_SUPPLY_USB_TYPE_SDP,
+ POWER_SUPPLY_USB_TYPE_CDP,
+ POWER_SUPPLY_USB_TYPE_DCP,
+ POWER_SUPPLY_USB_TYPE_ACA,
+ POWER_SUPPLY_USB_TYPE_UNKNOWN,
+};
+
+static const enum power_supply_property cht_wc_extcon_psy_props[] = {
+ POWER_SUPPLY_PROP_USB_TYPE,
+ POWER_SUPPLY_PROP_ONLINE,
+};
+
+static const struct power_supply_desc cht_wc_extcon_psy_desc = {
+ .name = "cht_wcove_pwrsrc",
+ .type = POWER_SUPPLY_TYPE_USB,
+ .usb_types = cht_wc_extcon_psy_usb_types,
+ .num_usb_types = ARRAY_SIZE(cht_wc_extcon_psy_usb_types),
+ .properties = cht_wc_extcon_psy_props,
+ .num_properties = ARRAY_SIZE(cht_wc_extcon_psy_props),
+ .get_property = cht_wc_extcon_psy_get_prop,
+};
+
+static int cht_wc_extcon_register_psy(struct cht_wc_extcon_data *ext)
+{
+ struct power_supply_config psy_cfg = { .drv_data = ext };
+
+ ext->psy = devm_power_supply_register(ext->dev,
+ &cht_wc_extcon_psy_desc,
+ &psy_cfg);
+ return PTR_ERR_OR_ZERO(ext->psy);
+}
+
static int cht_wc_extcon_probe(struct platform_device *pdev)
{
struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
@@ -463,6 +531,21 @@ static int cht_wc_extcon_probe(struct platform_device *pdev)
cht_wc_extcon_set_5v_boost(ext, false);
break;
case INTEL_CHT_WC_LENOVO_YOGABOOK1:
+ /* Do this first, as it may very well return -EPROBE_DEFER. */
+ ret = cht_wc_extcon_get_role_sw_and_regulator(ext);
+ if (ret)
+ return ret;
+ /*
+ * The bq25890 used here relies on this driver's BC-1.2 charger
+ * detection, and the bq25890 driver expect this info to be
+ * available through a parent power_supply class device which
+ * models the detected charger (idem to how the Type-C TCPM code
+ * registers a power_supply classdev for the connected charger).
+ */
+ ret = cht_wc_extcon_register_psy(ext);
+ if (ret)
+ return ret;
+ break;
case INTEL_CHT_WC_XIAOMI_MIPAD2:
ret = cht_wc_extcon_get_role_sw_and_regulator(ext);
if (ret)
--
2.31.1