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authorAl Cooper <al.cooper@broadcom.com>2017-09-22 15:34:02 -0400
committerKishon Vijay Abraham I <kishon@ti.com>2017-10-03 11:54:55 +0530
commit415060b21f318e009d865b4bcbf8f220ebc36964 (patch)
tree837e78302aefa70b6ad64954ce348c885faa1068 /drivers/phy
parent49859e55e364b9e6a53ae8f80318a2e7bd35ef37 (diff)
phy: usb: phy-brcm-usb: Add ability to force DRD mode to host or device
When the usb phy device mode is set to "drd", the USB port will switch between device and host modes depending on what's plugged into the port. Customers have asked for the ability to force host or device mode from software. This commit adds sysfs entries to the phy device that allow this. The sysfs for the phy device can be found at: /sys/bus/platform/drivers/brcmstb-usb-phy/*.usb-phy The following sysfs entries were added: - "dr_mode" (RO) - The current phy "dr_mode" setting. It will be set to one of the following values: - "host" - host mode - "peripheral " - device mode - "drd" - switch between device and host mode based on installed device - "typec-pd" - device/host mode is controller by the USB Type-C PD protocol. If "dr_mode" is "drd" - "drd_select" (RW) - It will be set to one of the following values: - "host" - force host mode - "device" - force device mode - "auto" - allow normal auto selection of host/device based on inserted USB device Signed-off-by: Al Cooper <alcooperx@gmail.com> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Diffstat (limited to 'drivers/phy')
-rw-r--r--drivers/phy/broadcom/phy-brcm-usb.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/drivers/phy/broadcom/phy-brcm-usb.c b/drivers/phy/broadcom/phy-brcm-usb.c
index 8ffd0f14f809..195b98139e5f 100644
--- a/drivers/phy/broadcom/phy-brcm-usb.c
+++ b/drivers/phy/broadcom/phy-brcm-usb.c
@@ -27,6 +27,8 @@
#include "phy-brcm-usb-init.h"
+static DEFINE_MUTEX(sysfs_lock);
+
enum brcm_usb_phy_id {
BRCM_USB_PHY_2_0 = 0,
BRCM_USB_PHY_3_0,
@@ -45,6 +47,12 @@ static struct value_to_name_map brcm_dr_mode_to_name[] = {
{ USB_CTLR_MODE_TYPEC_PD, "typec-pd" }
};
+static struct value_to_name_map brcm_dual_mode_to_name[] = {
+ { 0, "host" },
+ { 1, "device" },
+ { 2, "auto" },
+};
+
struct brcm_usb_phy {
struct phy *phy;
unsigned int id;
@@ -161,6 +169,73 @@ static int name_to_value(struct value_to_name_map *table, int count,
return -EINVAL;
}
+static const char *value_to_name(struct value_to_name_map *table, int count,
+ int value)
+{
+ if (value >= count)
+ return "unknown";
+ return table[value].name;
+}
+
+static ssize_t dr_mode_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct brcm_usb_phy_data *priv = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%s\n",
+ value_to_name(&brcm_dr_mode_to_name[0],
+ ARRAY_SIZE(brcm_dr_mode_to_name),
+ priv->ini.mode));
+}
+static DEVICE_ATTR_RO(dr_mode);
+
+static ssize_t dual_select_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct brcm_usb_phy_data *priv = dev_get_drvdata(dev);
+ int value;
+ int res;
+
+ mutex_lock(&sysfs_lock);
+ res = name_to_value(&brcm_dual_mode_to_name[0],
+ ARRAY_SIZE(brcm_dual_mode_to_name), buf, &value);
+ if (!res) {
+ brcm_usb_init_set_dual_select(&priv->ini, value);
+ res = len;
+ }
+ mutex_unlock(&sysfs_lock);
+ return res;
+}
+
+static ssize_t dual_select_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct brcm_usb_phy_data *priv = dev_get_drvdata(dev);
+ int value;
+
+ mutex_lock(&sysfs_lock);
+ value = brcm_usb_init_get_dual_select(&priv->ini);
+ mutex_unlock(&sysfs_lock);
+ return sprintf(buf, "%s\n",
+ value_to_name(&brcm_dual_mode_to_name[0],
+ ARRAY_SIZE(brcm_dual_mode_to_name),
+ value));
+}
+static DEVICE_ATTR_RW(dual_select);
+
+static struct attribute *brcm_usb_phy_attrs[] = {
+ &dev_attr_dr_mode.attr,
+ &dev_attr_dual_select.attr,
+ NULL
+};
+
+static const struct attribute_group brcm_usb_phy_group = {
+ .attrs = brcm_usb_phy_attrs,
+};
+
static int brcm_usb_phy_dvr_init(struct device *dev,
struct brcm_usb_phy_data *priv,
struct device_node *dn)
@@ -277,6 +352,16 @@ static int brcm_usb_phy_probe(struct platform_device *pdev)
/* make sure invert settings are correct */
brcm_usb_init_ipp(&priv->ini);
+ /*
+ * Create sysfs entries for mode.
+ * Remove "dual_select" attribute if not in dual mode
+ */
+ if (priv->ini.mode != USB_CTLR_MODE_DRD)
+ brcm_usb_phy_attrs[1] = NULL;
+ err = sysfs_create_group(&dev->kobj, &brcm_usb_phy_group);
+ if (err)
+ dev_warn(dev, "Error creating sysfs attributes\n");
+
/* start with everything off */
if (priv->has_xhci)
brcm_usb_uninit_xhci(&priv->ini);

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