usb: typec: hd3ss3220: Add polling support

Some platforms(for eg: RZ/V2M EVK) does not have interrupt pin
connected to HD3SS3220. Add polling support for role detection.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20221209171836.71610-3-biju.das.jz@bp.renesas.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/typec/hd3ss3220.c b/drivers/usb/typec/hd3ss3220.c
index f128664..746ef3a 100644 (file)
--- a/drivers/usb/typec/hd3ss3220.c
+++ b/drivers/usb/typec/hd3ss3220.c
@@ -14,6 +14,7 @@
 #include <linux/slab.h>
 #include <linux/usb/typec.h>
 #include <linux/delay.h>
+#include <linux/workqueue.h>
 
 #define HD3SS3220_REG_CN_STAT_CTRL     0x09
 #define HD3SS3220_REG_GEN_CTRL         0x0A
@@ -37,6 +38,9 @@ struct hd3ss3220 {
        struct regmap *regmap;
        struct usb_role_switch  *role_sw;
        struct typec_port *port;
+       struct delayed_work output_poll_work;
+       enum usb_role role_state;
+       bool poll;
 };
 
 static int hd3ss3220_set_source_pref(struct hd3ss3220 *hd3ss3220, int src_pref)
@@ -118,6 +122,22 @@ static void hd3ss3220_set_role(struct hd3ss3220 *hd3ss3220)
        default:
                break;
        }
+
+       hd3ss3220->role_state = role_state;
+}
+
+static void output_poll_execute(struct work_struct *work)
+{
+       struct delayed_work *delayed_work = to_delayed_work(work);
+       struct hd3ss3220 *hd3ss3220 = container_of(delayed_work,
+                                                  struct hd3ss3220,
+                                                  output_poll_work);
+       enum usb_role role_state = hd3ss3220_get_attached_state(hd3ss3220);
+
+       if (hd3ss3220->role_state != role_state)
+               hd3ss3220_set_role(hd3ss3220);
+
+       schedule_delayed_work(&hd3ss3220->output_poll_work, HZ);
 }
 
 static irqreturn_t hd3ss3220_irq(struct hd3ss3220 *hd3ss3220)
@@ -223,6 +243,9 @@ static int hd3ss3220_probe(struct i2c_client *client)
                                        "hd3ss3220", &client->dev);
                if (ret)
                        goto err_unreg_port;
+       } else {
+               INIT_DELAYED_WORK(&hd3ss3220->output_poll_work, output_poll_execute);
+               hd3ss3220->poll = true;
        }
 
        ret = i2c_smbus_read_byte_data(client, HD3SS3220_REG_DEV_REV);
@@ -231,6 +254,9 @@ static int hd3ss3220_probe(struct i2c_client *client)
 
        fwnode_handle_put(connector);
 
+       if (hd3ss3220->poll)
+               schedule_delayed_work(&hd3ss3220->output_poll_work, HZ);
+
        dev_info(&client->dev, "probed revision=0x%x\n", ret);
 
        return 0;
@@ -248,6 +274,9 @@ static void hd3ss3220_remove(struct i2c_client *client)
 {
        struct hd3ss3220 *hd3ss3220 = i2c_get_clientdata(client);
 
+       if (hd3ss3220->poll)
+               cancel_delayed_work_sync(&hd3ss3220->output_poll_work);
+
        typec_unregister_port(hd3ss3220->port);
        usb_role_switch_put(hd3ss3220->role_sw);
 }