From: Saranya Gopal <saranya.gopal@intel.com>
Date: Tue, 16 Nov 2021 10:36:13 +0000 (+0530)
Subject: usb: typec: ucsi: Expose number of alternate modes in partner
X-Git-Tag: v5.17-rc1~109^2~85
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=4616dddcfaf75cfbfbff7ce8a468038c697444ce;p=thirdparty%2Fkernel%2Flinux.git

usb: typec: ucsi: Expose number of alternate modes in partner

Type-c class provides an option to expose the number of alternate
modes in the port partner as a sysfs interface. Use that to
expose the number of alternate modes in the port partner from
the ucsi driver.

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Rajaram Regupathy <rajaram.regupathy@intel.com>
Signed-off-by: Saranya Gopal <saranya.gopal@intel.com>
Link: https://lore.kernel.org/r/20211116103613.31349-1-saranya.gopal@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
index 6aa28384f77f1..9d6b7e02d6efb 100644
--- a/drivers/usb/typec/ucsi/ucsi.c
+++ b/drivers/usb/typec/ucsi/ucsi.c
@@ -303,6 +303,17 @@ static int ucsi_next_altmode(struct typec_altmode **alt)
 	return -ENOENT;
 }
 
+static int ucsi_get_num_altmode(struct typec_altmode **alt)
+{
+	int i;
+
+	for (i = 0; i < UCSI_MAX_ALTMODES; i++)
+		if (!alt[i])
+			break;
+
+	return i;
+}
+
 static int ucsi_register_altmode(struct ucsi_connector *con,
 				 struct typec_altmode_desc *desc,
 				 u8 recipient)
@@ -607,7 +618,7 @@ static int ucsi_get_src_pdos(struct ucsi_connector *con)
 
 static int ucsi_check_altmodes(struct ucsi_connector *con)
 {
-	int ret;
+	int ret, num_partner_am;
 
 	ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP);
 	if (ret && ret != -ETIMEDOUT)
@@ -617,6 +628,9 @@ static int ucsi_check_altmodes(struct ucsi_connector *con)
 
 	/* Ignoring the errors in this case. */
 	if (con->partner_altmode[0]) {
+		num_partner_am = ucsi_get_num_altmode(con->partner_altmode);
+		if (num_partner_am > 0)
+			typec_partner_set_num_altmodes(con->partner, num_partner_am);
 		ucsi_altmode_update_active(con);
 		return 0;
 	}