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[PATCH v2 02/14] staging: typec: tcpm: Add get_current_limit tcpc_dev callback

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A Rp signalling the default current limit indicates that we're possibly
connected to an USB2 power-source. In some cases the type-c port-controller
may provide the capability to detect the current-limit in this case,
through e.g. BC1.2 detection.

This commit adds an optional get_current_limit tcpc_dev callback which
allows the port-controller to provide current-limit detection for when
the CC pin is pulled up with Rp.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Changes in v2:
-s/get_usb2_current_limit/get_current_limit/
---
 drivers/staging/typec/tcpm.c | 5 ++++-
 drivers/staging/typec/tcpm.h | 7 +++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/typec/tcpm.c b/drivers/staging/typec/tcpm.c
index 20eb4eb..8e823af 100644
--- a/drivers/staging/typec/tcpm.c
+++ b/drivers/staging/typec/tcpm.c
@@ -660,7 +660,10 @@ static u32 tcpm_get_current_limit(struct tcpm_port *port)
 		break;
 	case TYPEC_CC_RP_DEF:
 	default:
-		limit = 0;
+		if (port->tcpc->get_current_limit)
+			limit = port->tcpc->get_current_limit(port->tcpc);
+		else
+			limit = 0;
 		break;
 	}
 
diff --git a/drivers/staging/typec/tcpm.h b/drivers/staging/typec/tcpm.h
index 19c307d..1465668 100644
--- a/drivers/staging/typec/tcpm.h
+++ b/drivers/staging/typec/tcpm.h
@@ -108,6 +108,13 @@ struct tcpc_dev {
 
 	int (*init)(struct tcpc_dev *dev);
 	int (*get_vbus)(struct tcpc_dev *dev);
+	/*
+	 * This optional callback gets called by the tcpm core when configured
+	 * as a snk and cc=Rp-def. This allows the tcpm to provide a fallback
+	 * current-limit detection method for the cc=Rp-def case. E.g. some
+	 * tcpcs may include BC1.2 charger detection and use that in this case.
+	 */
+	int (*get_current_limit)(struct tcpc_dev *dev);
 	int (*set_cc)(struct tcpc_dev *dev, enum typec_cc_status cc);
 	int (*get_cc)(struct tcpc_dev *dev, enum typec_cc_status *cc1,
 		      enum typec_cc_status *cc2);
-- 
2.9.4

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[PATCH v2 00/14] Hookup typec power-negotation to the PMIC and charger Hans de Goede <hdegoede@redhat.com> - 2017-08-15 22:10 +0200
  [PATCH v2 11/14] power: supply: bq24190_charger: Get input_current_limit from our supplier Hans de Goede <hdegoede@redhat.com> - 2017-08-15 22:10 +0200
    Re: [PATCH v2 11/14] power: supply: bq24190_charger: Get  input_current_limit from our supplier Liam Breck <liam@networkimprov.net> - 2017-08-16 22:30 +0200
  [PATCH v2 09/14] power: supply: bq24190_charger: Export 5V boost converter as regulator Hans de Goede <hdegoede@redhat.com> - 2017-08-15 22:10 +0200
  [PATCH v2 06/14] staging: typec: fusb302: Add support for USB2 charger detection through extcon Hans de Goede <hdegoede@redhat.com> - 2017-08-15 22:10 +0200
  [PATCH v2 02/14] staging: typec: tcpm: Add get_current_limit tcpc_dev callback Hans de Goede <hdegoede@redhat.com> - 2017-08-15 22:10 +0200
    Re: [PATCH v2 02/14] staging: typec: tcpm: Add get_current_limit  tcpc_dev callback Guenter Roeck <linux@roeck-us.net> - 2017-08-16 17:20 +0200
  [PATCH v2 12/14] power: supply: bq24190_charger: Remove extcon handling Hans de Goede <hdegoede@redhat.com> - 2017-08-15 22:10 +0200
  [PATCH v2 08/14] power: supply: Add power_supply_set_input_current_limit_from_supplier helper Hans de Goede <hdegoede@redhat.com> - 2017-08-15 22:10 +0200
    Re: [PATCH v2 08/14] power: supply: Add  power_supply_set_input_current_limit_from_supplier helper Tony Lindgren <tony@atomide.com> - 2017-08-16 18:00 +0200
      Re: [PATCH v2 08/14] power: supply: Add  power_supply_set_input_current_limit_from_supplier helper Hans de Goede <hdegoede@redhat.com> - 2017-08-16 19:40 +0200
        Re: [PATCH v2 08/14] power: supply: Add  power_supply_set_input_current_limit_from_supplier helper Tony Lindgren <tony@atomide.com> - 2017-08-16 21:30 +0200
  [PATCH v2 01/14] i2c: Allow overriding dev_name through board_info Hans de Goede <hdegoede@redhat.com> - 2017-08-15 22:10 +0200

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