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/* SPDX-License-Identifier: GPL-2.0 */
/*
* System Trace Module (STM) infrastructure
* Copyright (c) 2014, Intel Corporation.
*
* STM class implements generic infrastructure for System Trace Module devices
* as defined in MIPI STPv2 specification.
*/
#ifndef _STM_STM_H_
#define _STM_STM_H_
#include <linux/configfs.h>
struct stp_policy;
struct stp_policy_node;
struct stm_protocol_driver;
int stp_configfs_init(void);
void stp_configfs_exit(void);
void *stp_policy_node_priv(struct stp_policy_node *pn);
struct stp_master {
unsigned int nr_free;
unsigned long chan_map[0];
};
struct stm_device {
struct device dev;
struct module *owner;
struct stp_policy *policy;
struct mutex policy_mutex;
int major;
unsigned int sw_nmasters;
struct stm_data *data;
struct mutex link_mutex;
spinlock_t link_lock;
struct list_head link_list;
/* framing protocol in use */
const struct stm_protocol_driver *pdrv;
const struct config_item_type *pdrv_node_type;
/* master allocation */
spinlock_t mc_lock;
struct stp_master *masters[0];
};
#define to_stm_device(_d) \
container_of((_d), struct stm_device, dev)
struct stp_policy_node *
stp_policy_node_lookup(struct stm_device *stm, char *s);
void stp_policy_node_put(struct stp_policy_node *policy_node);
void stp_policy_unbind(struct stp_policy *policy);
void stp_policy_node_get_ranges(struct stp_policy_node *policy_node,
unsigned int *mstart, unsigned int *mend,
unsigned int *cstart, unsigned int *cend);
const struct config_item_type *
get_policy_node_type(struct configfs_attribute **attrs);
struct stm_output {
spinlock_t lock;
unsigned int master;
unsigned int channel;
unsigned int nr_chans;
void *pdrv_private;
};
struct stm_file {
struct stm_device *stm;
struct stm_output output;
};
struct stm_device *stm_find_device(const char *name);
void stm_put_device(struct stm_device *stm);
struct stm_source_device {
struct device dev;
struct stm_source_data *data;
spinlock_t link_lock;
struct stm_device __rcu *link;
struct list_head link_entry;
/* one output per stm_source device */
struct stm_output output;
};
#define to_stm_source_device(_d) \
container_of((_d), struct stm_source_device, dev)
void *to_pdrv_policy_node(struct config_item *item);
struct stm_protocol_driver {
struct module *owner;
const char *name;
ssize_t (*write)(struct stm_data *data,
struct stm_output *output, unsigned int chan,
const char *buf, size_t count);
void (*policy_node_init)(void *arg);
int (*output_open)(void *priv, struct stm_output *output);
void (*output_close)(struct stm_output *output);
ssize_t priv_sz;
struct configfs_attribute **policy_attr;
};
int stm_register_protocol(const struct stm_protocol_driver *pdrv);
void stm_unregister_protocol(const struct stm_protocol_driver *pdrv);
int stm_lookup_protocol(const char *name,
const struct stm_protocol_driver **pdrv,
const struct config_item_type **type);
void stm_put_protocol(const struct stm_protocol_driver *pdrv);
ssize_t stm_data_write(struct stm_data *data, unsigned int m,
unsigned int c, bool ts_first, const void *buf,
size_t count);
#endif /* _STM_STM_H_ */
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