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-rw-r--r--drivers/extcon/extcon.h68
1 files changed, 68 insertions, 0 deletions
diff --git a/drivers/extcon/extcon.h b/drivers/extcon/extcon.h
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+++ b/drivers/extcon/extcon.h
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+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LINUX_EXTCON_INTERNAL_H__
+#define __LINUX_EXTCON_INTERNAL_H__
+
+#include <linux/extcon-provider.h>
+
+/**
+ * struct extcon_dev - An extcon device represents one external connector.
+ * @name: The name of this extcon device. Parent device name is
+ * used if NULL.
+ * @supported_cable: Array of supported cable names ending with EXTCON_NONE.
+ * If supported_cable is NULL, cable name related APIs
+ * are disabled.
+ * @mutually_exclusive: Array of mutually exclusive set of cables that cannot
+ * be attached simultaneously. The array should be
+ * ending with 0 or be NULL (no mutually exclusive cables).
+ * For example, if it is {0x7, 0x30, 0}, then,
+ * {0, 1}, {0, 1, 2}, {0, 2}, {1, 2}, or {4, 5} cannot
+ * be attached simulataneously. {0x7, 0} is equivalent to
+ * {0x3, 0x6, 0x5, 0}. If it is {0xFFFFFFFF, 0}, there
+ * can be no simultaneous connections.
+ * @dev: Device of this extcon.
+ * @id: Unique device ID of this extcon.
+ * @state: Attach/detach state of this extcon. Do not provide at
+ * register-time.
+ * @nh_all: Notifier for the state change events for all supported
+ * external connectors from this extcon.
+ * @nh: Notifier for the state change events from this extcon
+ * @entry: To support list of extcon devices so that users can
+ * search for extcon devices based on the extcon name.
+ * @lock: Protects device state and serialises device registration
+ * @max_supported: Internal value to store the number of cables.
+ * @extcon_dev_type: Device_type struct to provide attribute_groups
+ * customized for each extcon device.
+ * @cables: Sysfs subdirectories. Each represents one cable.
+ *
+ * In most cases, users only need to provide "User initializing data" of
+ * this struct when registering an extcon. In some exceptional cases,
+ * optional callbacks may be needed. However, the values in "internal data"
+ * are overwritten by register function.
+ */
+struct extcon_dev {
+ /* Optional user initializing data */
+ const char *name;
+ const unsigned int *supported_cable;
+ const u32 *mutually_exclusive;
+
+ /* Internal data. Please do not set. */
+ struct device dev;
+ unsigned int id;
+ struct raw_notifier_head nh_all;
+ struct raw_notifier_head *nh;
+ struct list_head entry;
+ int max_supported;
+ spinlock_t lock; /* could be called by irq handler */
+ u32 state;
+
+ /* /sys/class/extcon/.../cable.n/... */
+ struct device_type extcon_dev_type;
+ struct extcon_cable *cables;
+
+ /* /sys/class/extcon/.../mutually_exclusive/... */
+ struct attribute_group attr_g_muex;
+ struct attribute **attrs_muex;
+ struct device_attribute *d_attrs_muex;
+};
+
+#endif /* __LINUX_EXTCON_INTERNAL_H__ */