/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Generic framer header file
*
* Copyright 2023 CS GROUP France
*
* Author : Herve Codina < herve . codina @ bootlin . com >
*/
#ifndef __DRIVERS_FRAMER_H
#define __DRIVERS_FRAMER_H
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/notifier.h>
#include <linux/of.h>
#include <linux/device.h>
#include <linux/workqueue.h>
/**
* enum framer_iface - Framer interface
* @ FRAMER_IFACE_E1 : E1 interface
* @ FRAMER_IFACE_T1 : T1 interface
*/
enum framer_iface {
FRAMER_IFACE_E1,
FRAMER_IFACE_T1,
};
/**
* enum framer_clock_type - Framer clock type
* @ FRAMER_CLOCK_EXT : External clock
* @ FRAMER_CLOCK_INT : Internal clock
*/
enum framer_clock_type {
FRAMER_CLOCK_EXT,
FRAMER_CLOCK_INT,
};
/**
* struct framer_config - Framer configuration
* @ iface : Framer line interface
* @ clock_type : Framer clock type
* @ line_clock_rate : Framer line clock rate
*/
struct framer_config {
enum framer_iface iface;
enum framer_clock_type clock_type;
unsigned long line_clock_rate;
};
/**
* struct framer_status - Framer status
* @ link_is_on : Framer link state . true , the link is on , false , the link is off .
*/
struct framer_status {
bool link_is_on;
};
/**
* enum framer_event - Event available for notification
* @ FRAMER_EVENT_STATUS : Event notified on framer_status changes
*/
enum framer_event {
FRAMER_EVENT_STATUS,
};
/**
* struct framer - represents the framer device
* @ dev : framer device
* @ id : id of the framer device
* @ ops : function pointers for performing framer operations
* @ mutex : mutex to protect framer_ops
* @ init_count : used to protect when the framer is used by multiple consumers
* @ power_count : used to protect when the framer is used by multiple consumers
* @ pwr : power regulator associated with the framer
* @ notify_status_work : work structure used for status notifications
* @ notifier_list : notifier list used for notifications
* @ polling_work : delayed work structure used for the polling task
* @ prev_status : previous read status used by the polling task to detect changes
*/
struct framer {
struct device dev;
int id;
const struct framer_ops *ops;
struct mutex mutex; /* Protect framer */
int init_count;
int power_count;
struct regulator *pwr;
struct work_struct notify_status_work;
struct blocking_notifier_head notifier_list;
struct delayed_work polling_work;
struct framer_status prev_status;
};
#if IS_ENABLED(CONFIG_GENERIC_FRAMER)
int framer_pm_runtime_get(struct framer *framer);
int framer_pm_runtime_get_sync(struct framer *framer);
int framer_pm_runtime_put(struct framer *framer);
int framer_pm_runtime_put_sync(struct framer *framer);
int framer_init(struct framer *framer);
int framer_exit(struct framer *framer);
int framer_power_on(struct framer *framer);
int framer_power_off(struct framer *framer);
int framer_get_status(struct framer *framer, struct framer_status *status);
int framer_get_config(struct framer *framer, struct framer_config *config);
int framer_set_config(struct framer *framer, const struct framer_config *config);
int framer_notifier_register(struct framer *framer, struct notifier_block *nb);
int framer_notifier_unregister(struct framer *framer, struct notifier_block *nb);
struct framer *framer_get(struct device *dev, const char *con_id);
void framer_put(struct device *dev, struct framer *framer);
struct framer *devm_framer_get(struct device *dev, const char *con_id);
struct framer *devm_framer_optional_get(struct device *dev, const char *con_id);
#else
static inline int framer_pm_runtime_get(struct framer *framer)
{
return -ENOSYS;
}
static inline int framer_pm_runtime_get_sync(struct framer *framer)
{
return -ENOSYS;
}
static inline int framer_pm_runtime_put(struct framer *framer)
{
return -ENOSYS;
}
static inline int framer_pm_runtime_put_sync(struct framer *framer)
{
return -ENOSYS;
}
static inline int framer_init(struct framer *framer)
{
return -ENOSYS;
}
static inline int framer_exit(struct framer *framer)
{
return -ENOSYS;
}
static inline int framer_power_on(struct framer *framer)
{
return -ENOSYS;
}
static inline int framer_power_off(struct framer *framer)
{
return -ENOSYS;
}
static inline int framer_get_status(struct framer *framer, struct framer_status *status)
{
return -ENOSYS;
}
static inline int framer_get_config(struct framer *framer, struct framer_config *config)
{
return -ENOSYS;
}
static inline int framer_set_config(struct framer *framer, const struct framer_config *config)
{
return -ENOSYS;
}
static inline int framer_notifier_register(struct framer *framer,
struct notifier_block *nb)
{
return -ENOSYS;
}
static inline int framer_notifier_unregister(struct framer *framer,
struct notifier_block *nb)
{
return -ENOSYS;
}
static inline struct framer *framer_get(struct device *dev, const char *con_id)
{
return ERR_PTR(-ENOSYS);
}
static inline void framer_put(struct device *dev, struct framer *framer)
{
}
static inline struct framer *devm_framer_get(struct device *dev, const char *con_id)
{
return ERR_PTR(-ENOSYS);
}
static inline struct framer *devm_framer_optional_get(struct device *dev, const char *con_id)
{
return NULL;
}
#endif
#endif /* __DRIVERS_FRAMER_H */
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