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Subject[PATCH 6/7] drm/bridge: anx7625: Register Type-C mode switches
Date
When the DT node has "switches" available, register a Type-C mode-switch
for each listed "switch". This allows the driver to receive state
information about what operating mode a Type-C port and its connected
peripherals are in, as well as status information (like VDOs) related to
that state.

The callback function is currently a stub, but subsequent patches will
implement the required functionality.

Signed-off-by: Prashant Malani <pmalani@chromium.org>
---
drivers/gpu/drm/bridge/analogix/anx7625.c | 73 +++++++++++++++++++++++
drivers/gpu/drm/bridge/analogix/anx7625.h | 6 ++
2 files changed, 79 insertions(+)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 07ed44c6b839..d41a21103bd3 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -15,6 +15,7 @@
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/types.h>
+#include <linux/usb/typec_mux.h>
#include <linux/workqueue.h>

#include <linux/of_gpio.h>
@@ -2581,9 +2582,59 @@ static void anx7625_runtime_disable(void *data)
pm_runtime_disable(data);
}

+static int anx7625_typec_mux_set(struct typec_mux_dev *mux,
+ struct typec_mux_state *state)
+{
+ return 0;
+}
+
+static int anx7625_register_mode_switch(struct device *dev, struct device_node *node,
+ struct anx7625_data *ctx)
+{
+ struct anx7625_port_data *port_data;
+ struct typec_mux_desc mux_desc = {};
+ char name[32];
+ u32 port_num;
+ int ret;
+
+ ret = of_property_read_u32(node, "reg", &port_num);
+ if (ret)
+ return ret;
+
+ if (port_num >= ctx->num_typec_switches) {
+ dev_err(dev, "Invalid port number specified: %d\n", port_num);
+ return -EINVAL;
+ }
+
+ port_data = &ctx->typec_ports[port_num];
+ port_data->ctx = ctx;
+ mux_desc.fwnode = &node->fwnode;
+ mux_desc.drvdata = port_data;
+ snprintf(name, sizeof(name), "%s-%u", node->name, port_num);
+ mux_desc.name = name;
+ mux_desc.set = anx7625_typec_mux_set;
+
+ port_data->typec_mux = typec_mux_register(dev, &mux_desc);
+ if (IS_ERR(port_data->typec_mux)) {
+ ret = PTR_ERR(port_data->typec_mux);
+ dev_err(dev, "Mode switch register for port %d failed: %d", port_num, ret);
+ }
+
+ return ret;
+}
+
+static void anx7625_unregister_typec_switches(struct anx7625_data *ctx)
+{
+ int i;
+
+ for (i = 0; i < ctx->num_typec_switches; i++)
+ typec_mux_unregister(ctx->typec_ports[i].typec_mux);
+}
+
static int anx7625_register_typec_switches(struct device *device, struct anx7625_data *ctx)
{
struct device_node *of = NULL;
+ struct device_node *sw;
int ret = 0;

of = of_get_child_by_name(device->of_node, "switches");
@@ -2594,6 +2645,26 @@ static int anx7625_register_typec_switches(struct device *device, struct anx7625
if (ctx->num_typec_switches <= 0)
return -ENODEV;

+ ctx->typec_ports = devm_kzalloc(device,
+ ctx->num_typec_switches * sizeof(struct anx7625_port_data),
+ GFP_KERNEL);
+ if (!ctx->typec_ports)
+ return -ENOMEM;
+
+ /* Register switches for each connector. */
+ for_each_available_child_of_node(of, sw) {
+ if (!of_property_read_bool(sw, "mode-switch"))
+ continue;
+ ret = anx7625_register_mode_switch(device, sw, ctx);
+ if (ret) {
+ dev_err(device, "Failed to register mode switch: %d\n", ret);
+ break;
+ }
+ }
+
+ if (ret)
+ anx7625_unregister_typec_switches(ctx);
+
return ret;
}

@@ -2759,6 +2830,8 @@ static int anx7625_i2c_remove(struct i2c_client *client)

drm_bridge_remove(&platform->bridge);

+ anx7625_unregister_typec_switches(platform);
+
if (platform->pdata.intp_irq)
destroy_workqueue(platform->workqueue);

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.h b/drivers/gpu/drm/bridge/analogix/anx7625.h
index d5cbca708842..76cfc64f7574 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.h
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.h
@@ -443,6 +443,11 @@ struct anx7625_i2c_client {
struct i2c_client *tcpc_client;
};

+struct anx7625_port_data {
+ struct typec_mux_dev *typec_mux;
+ struct anx7625_data *ctx;
+};
+
struct anx7625_data {
struct anx7625_platform_data pdata;
struct platform_device *audio_pdev;
@@ -474,6 +479,7 @@ struct anx7625_data {
struct mipi_dsi_device *dsi;
struct drm_dp_aux aux;
int num_typec_switches;
+ struct anx7625_port_data *typec_ports;
};

#endif /* __ANX7625_H__ */
--
2.36.1.255.ge46751e96f-goog
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