linux-kernel - [PATCH v5 6/8] usb: misc: onboard_dev: add support for non-hub devices

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Message-Id: <20240228-onboard_xvf3500-v5-6-76b805fd3fe6@wolfvision.net>
Date: Wed, 28 Feb 2024 14:51:33 +0100
From: Javier Carrasco <javier.carrasco@...fvision.net>
To: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
 Rob Herring <robh+dt@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>, Matthias Kaehlcke <mka@...omium.org>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Helen Koike <helen.koike@...labora.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
 Russell King <linux@...linux.org.uk>
Cc: linux-sound@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, 
 dri-devel@...ts.freedesktop.org, linux-arm-kernel@...ts.infradead.org, 
 Javier Carrasco <javier.carrasco@...fvision.net>
Subject: [PATCH v5 6/8] usb: misc: onboard_dev: add support for non-hub
 devices

Most of the functionality this driver provides can be used by non-hub
devices as well.

To account for the hub-specific code, add a flag to the device data
structure and check its value for hub-specific code.

The 'always_powered_in_supend' attribute is only available for hub
devices, keeping the driver's default behavior for non-hub devices (keep
on in suspend).

Signed-off-by: Javier Carrasco <javier.carrasco@...fvision.net>
---
 drivers/usb/misc/onboard_usb_dev.c | 25 +++++++++++++++++++++++--
 drivers/usb/misc/onboard_usb_dev.h | 10 ++++++++++
 2 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/misc/onboard_usb_dev.c b/drivers/usb/misc/onboard_usb_dev.c
index e1779bd2d126..df0ed172c7ec 100644
--- a/drivers/usb/misc/onboard_usb_dev.c
+++ b/drivers/usb/misc/onboard_usb_dev.c
@@ -132,7 +132,8 @@ static int __maybe_unused onboard_dev_suspend(struct device *dev)
 	struct usbdev_node *node;
 	bool power_off = true;
 
-	if (onboard_dev->always_powered_in_suspend)
+	if (onboard_dev->always_powered_in_suspend &&
+	    !onboard_dev->pdata->is_hub)
 		return 0;
 
 	mutex_lock(&onboard_dev->lock);
@@ -262,7 +263,27 @@ static struct attribute *onboard_dev_attrs[] = {
 	&dev_attr_always_powered_in_suspend.attr,
 	NULL,
 };
-ATTRIBUTE_GROUPS(onboard_dev);
+
+static umode_t onboard_dev_attrs_are_visible(struct kobject *kobj,
+					     struct attribute *attr,
+					     int n)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct onboard_dev *onboard_dev = dev_get_drvdata(dev);
+
+	if (attr == &dev_attr_always_powered_in_suspend.attr &&
+	    !onboard_dev->pdata->is_hub)
+		return 0;
+
+	return attr->mode;
+}
+
+static const struct attribute_group onboard_dev_group = {
+	.is_visible = onboard_dev_attrs_are_visible,
+	.attrs = onboard_dev_attrs,
+};
+__ATTRIBUTE_GROUPS(onboard_dev);
+
 
 static void onboard_dev_attach_usb_driver(struct work_struct *work)
 {
diff --git a/drivers/usb/misc/onboard_usb_dev.h b/drivers/usb/misc/onboard_usb_dev.h
index 470736483cdf..106480ce72b5 100644
--- a/drivers/usb/misc/onboard_usb_dev.h
+++ b/drivers/usb/misc/onboard_usb_dev.h
@@ -12,60 +12,70 @@ struct onboard_dev_pdata {
 	unsigned long reset_us;		/* reset pulse width in us */
 	unsigned int num_supplies;	/* number of supplies */
 	const char * const supply_names[MAX_SUPPLIES]; /* use the real names */
+	bool is_hub;			/* true if the device is a HUB */
 };
 
 static const struct onboard_dev_pdata microchip_usb424_data = {
 	.reset_us = 1,
 	.num_supplies = 1,
 	.supply_names = { "vdd" },
+	.is_hub = true,
 };
 
 static const struct onboard_dev_pdata microchip_usb5744_data = {
 	.reset_us = 0,
 	.num_supplies = 2,
 	.supply_names = { "vdd", "vdd2" },
+	.is_hub = true,
 };
 
 static const struct onboard_dev_pdata realtek_rts5411_data = {
 	.reset_us = 0,
 	.num_supplies = 1,
 	.supply_names = { "vdd" },
+	.is_hub = true,
 };
 
 static const struct onboard_dev_pdata ti_tusb8041_data = {
 	.reset_us = 3000,
 	.num_supplies = 1,
 	.supply_names = { "vdd" },
+	.is_hub = true,
 };
 
 static const struct onboard_dev_pdata cypress_hx3_data = {
 	.reset_us = 10000,
 	.num_supplies = 2,
 	.supply_names = { "vdd", "vdd2" },
+	.is_hub = true,
 };
 
 static const struct onboard_dev_pdata cypress_hx2vl_data = {
 	.reset_us = 1,
 	.num_supplies = 1,
 	.supply_names = { "vdd" },
+	.is_hub = true,
 };
 
 static const struct onboard_dev_pdata genesys_gl850g_data = {
 	.reset_us = 3,
 	.num_supplies = 1,
 	.supply_names = { "vdd" },
+	.is_hub = true,
 };
 
 static const struct onboard_dev_pdata genesys_gl852g_data = {
 	.reset_us = 50,
 	.num_supplies = 1,
 	.supply_names = { "vdd" },
+	.is_hub = true,
 };
 
 static const struct onboard_dev_pdata vialab_vl817_data = {
 	.reset_us = 10,
 	.num_supplies = 1,
 	.supply_names = { "vdd" },
+	.is_hub = true,
 };
 
 static const struct of_device_id onboard_dev_match[] = {

-- 
2.40.1