include/linux/soc/qcom/smd.h

#ifndef __QCOM_SMD_H__
#define __QCOM_SMD_H__

#include <linux/device.h>
#include <linux/mod_devicetable.h>

struct qcom_smd;
struct qcom_smd_channel;
struct qcom_smd_lookup;

/**
 * struct qcom_smd_id - struct used for matching a smd device
 * @name:	name of the channel
 */
struct qcom_smd_id {
	char name[20];
};

/**
 * struct qcom_smd_device - smd device struct
 * @dev:	the device struct
 * @channel:	handle to the smd channel for this device
 */
struct qcom_smd_device {
	struct device dev;
	struct qcom_smd_channel *channel;
};

typedef int (*qcom_smd_cb_t)(struct qcom_smd_channel *, const void *, size_t);

/**
 * struct qcom_smd_driver - smd driver struct
 * @driver:	underlying device driver
 * @smd_match_table: static channel match table
 * @probe:	invoked when the smd channel is found
 * @remove:	invoked when the smd channel is closed
 * @callback:	invoked when an inbound message is received on the channel,
 *		should return 0 on success or -EBUSY if the data cannot be
 *		consumed at this time
 */
struct qcom_smd_driver {
	struct device_driver driver;
	const struct qcom_smd_id *smd_match_table;

	int (*probe)(struct qcom_smd_device *dev);
	void (*remove)(struct qcom_smd_device *dev);
	qcom_smd_cb_t callback;
};

#if IS_ENABLED(CONFIG_QCOM_SMD)

int qcom_smd_driver_register(struct qcom_smd_driver *drv);
void qcom_smd_driver_unregister(struct qcom_smd_driver *drv);

struct qcom_smd_channel *qcom_smd_open_channel(struct qcom_smd_channel *channel,
					       const char *name,
					       qcom_smd_cb_t cb);
void *qcom_smd_get_drvdata(struct qcom_smd_channel *channel);
void qcom_smd_set_drvdata(struct qcom_smd_channel *channel, void *data);
int qcom_smd_send(struct qcom_smd_channel *channel, const void *data, int len);


#else

static inline int qcom_smd_driver_register(struct qcom_smd_driver *drv)
{
	return -ENXIO;
}

static inline void qcom_smd_driver_unregister(struct qcom_smd_driver *drv)
{
	/* This shouldn't be possible */
	WARN_ON(1);
}

static inline struct qcom_smd_channel *
qcom_smd_open_channel(struct qcom_smd_channel *channel,
		      const char *name,
		      qcom_smd_cb_t cb)
{
	/* This shouldn't be possible */
	WARN_ON(1);
	return NULL;
}

void *qcom_smd_get_drvdata(struct qcom_smd_channel *channel)
{
	/* This shouldn't be possible */
	WARN_ON(1);
	return NULL;
}

void qcom_smd_set_drvdata(struct qcom_smd_channel *channel, void *data)
{
	/* This shouldn't be possible */
	WARN_ON(1);
}

static inline int qcom_smd_send(struct qcom_smd_channel *channel,
				const void *data, int len)
{
	/* This shouldn't be possible */
	WARN_ON(1);
	return -ENXIO;
}

#endif

#define module_qcom_smd_driver(__smd_driver) \
	module_driver(__smd_driver, qcom_smd_driver_register, \
		      qcom_smd_driver_unregister)


#endif