[PATCH net-next v2 05/14] dpll: dpllsim: Add support to set input pin state

[Petr Oros <poros@redhat.com>]

Add support for setting the state of input pins on the device.
Implement the state_on_dpll_set callback for input pins and advertise
the state-can-change capability for them, so that userspace can move a
pin between connected, disconnected and selectable. The driver stores
the requested state and reports it back unchanged, it does not act on it
yet. Output pins keep reporting their state only.

Signed-off-by: Petr Oros <poros@redhat.com>
---
 drivers/dpll/dpllsim/dpll.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/dpll/dpllsim/dpll.c b/drivers/dpll/dpllsim/dpll.c
index a1d5921fb8d017..2b0c053a7b6087 100644
--- a/drivers/dpll/dpllsim/dpll.c
+++ b/drivers/dpll/dpllsim/dpll.c
@@ -104,10 +104,23 @@ static int dpllsim_pin_state_get(const struct dpll_pin *pin, void *pin_priv,
 	return 0;
 }
 
+static int dpllsim_pin_state_set(const struct dpll_pin *pin, void *pin_priv,
+				 const struct dpll_device *dpll,
+				 void *dpll_priv, enum dpll_pin_state state,
+				 struct netlink_ext_ack *extack)
+{
+	struct dpllsim_pin *sim_pin = pin_priv;
+
+	guard(mutex)(&sim_pin->dev->lock);
+	sim_pin->state = state;
+	return 0;
+}
+
 static const struct dpll_pin_ops dpllsim_input_pin_ops = {
 	.frequency_get = dpllsim_pin_frequency_get,
 	.direction_get = dpllsim_pin_direction_get,
 	.state_on_dpll_get = dpllsim_pin_state_get,
+	.state_on_dpll_set = dpllsim_pin_state_set,
 };
 
 static const struct dpll_pin_ops dpllsim_output_pin_ops = {
@@ -149,6 +162,12 @@ static void dpllsim_pin_props(struct dpllsim_pin *pin,
 		prop->freq_supported_num = ARRAY_SIZE(dpllsim_freq_ext);
 		break;
 	}
+
+	/* Capabilities follow the ops the pin is served by */
+	if (dpllsim_pin_select_ops(pin) == &dpllsim_input_pin_ops)
+		prop->capabilities = DPLL_PIN_CAPABILITIES_STATE_CAN_CHANGE;
+	else
+		prop->capabilities = 0;
 }
 
 static bool dpllsim_pin_frequency_valid(struct dpllsim_pin *pin)
-- 
2.56.0