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From:   Prashant Malani <pmalani@chromium.org>
To:     linux-kernel@vger.kernel.org
Cc:     heikki.krogerus@linux.intel.com,
        Prashant Malani <pmalani@chromium.org>,
        Benson Leung <bleung@chromium.org>,
        Enric Balletbo i Serra <enric.balletbo@collabora.com>,
        Guenter Roeck <groeck@chromium.org>
Subject: [PATCH 1/3] platform/chrome: typec: Use notifier for updates
Date:   Mon,  6 Apr 2020 18:09:38 -0700
Message-Id: <20200407010940.155490-2-pmalani@chromium.org>
In-Reply-To: <20200407010940.155490-1-pmalani@chromium.org>
References: <20200407010940.155490-1-pmalani@chromium.org>
MIME-Version: 1.0
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Register a listener for the cros-usbpd-notifier, and update port state
when a notification comes in.

Signed-off-by: Prashant Malani <pmalani@chromium.org>
---
 drivers/platform/chrome/cros_ec_typec.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 874269c070739..cf7c2652a1d6d 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -11,6 +11,7 @@
 #include <linux/of.h>
 #include <linux/platform_data/cros_ec_commands.h>
 #include <linux/platform_data/cros_ec_proto.h>
+#include <linux/platform_data/cros_usbpd_notify.h>
 #include <linux/platform_device.h>
 #include <linux/usb/typec.h>
 
@@ -26,6 +27,7 @@ struct cros_typec_data {
 	struct typec_port *ports[EC_USB_PD_MAX_PORTS];
 	/* Initial capabilities for each port. */
 	struct typec_capability *caps[EC_USB_PD_MAX_PORTS];
+	struct notifier_block nb;
 };
 
 static int cros_typec_parse_port_props(struct typec_capability *cap,
@@ -272,6 +274,22 @@ static int cros_typec_get_cmd_version(struct cros_typec_data *typec)
 	return 0;
 }
 
+static int cros_ec_typec_event(struct notifier_block *nb,
+			       unsigned long host_event, void *_notify)
+{
+	struct cros_typec_data *typec = container_of(nb, struct cros_typec_data,
+						     nb);
+	int ret, i;
+
+	for (i = 0; i < typec->num_ports; i++) {
+		ret = cros_typec_port_update(typec, i);
+		if (ret < 0)
+			dev_warn(typec->dev, "Update failed for port:%d\n", i);
+	}
+
+	return NOTIFY_OK;
+}
+
 #ifdef CONFIG_ACPI
 static const struct acpi_device_id cros_typec_acpi_id[] = {
 	{ "GOOG0014", 0 },
@@ -332,6 +350,13 @@ static int cros_typec_probe(struct platform_device *pdev)
 			goto unregister_ports;
 	}
 
+	typec->nb.notifier_call = cros_ec_typec_event;
+	ret = cros_usbpd_register_notify(&typec->nb);
+	if (ret < 0) {
+		dev_err(dev, "Failed to register notifier\n");
+		goto unregister_ports;
+	}
+
 	return 0;
 
 unregister_ports:
-- 
2.26.0.292.g33ef6b2f38-goog