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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>
This commit is contained in:
Biju Das 2022-12-09 17:18:36 +00:00 committed by Greg Kroah-Hartman
parent bf58a687db
commit 569d23e9bf
1 changed files with 29 additions and 0 deletions
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29
drivers/usb/typec/hd3ss3220.c
View File

@ -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);
}