1 /* SPDX-License-Identifier: GPL-2.0 */
3 * System Trace Module (STM) infrastructure
4 * Copyright (c) 2014, Intel Corporation.
6 * STM class implements generic infrastructure for System Trace Module devices
7 * as defined in MIPI STPv2 specification.
13 #include <linux/configfs.h>
16 struct stp_policy_node;
17 struct stm_protocol_driver;
19 int stp_configfs_init(void);
20 void stp_configfs_exit(void);
22 void *stp_policy_node_priv(struct stp_policy_node *pn);
26 unsigned long chan_map[];
32 struct stp_policy *policy;
33 struct mutex policy_mutex;
35 unsigned int sw_nmasters;
36 struct stm_data *data;
37 struct mutex link_mutex;
39 struct list_head link_list;
40 /* framing protocol in use */
41 const struct stm_protocol_driver *pdrv;
42 const struct config_item_type *pdrv_node_type;
43 /* master allocation */
45 struct stp_master *masters[];
48 #define to_stm_device(_d) \
49 container_of((_d), struct stm_device, dev)
51 struct stp_policy_node *
52 stp_policy_node_lookup(struct stm_device *stm, char *s);
53 void stp_policy_node_put(struct stp_policy_node *policy_node);
54 void stp_policy_unbind(struct stp_policy *policy);
56 void stp_policy_node_get_ranges(struct stp_policy_node *policy_node,
57 unsigned int *mstart, unsigned int *mend,
58 unsigned int *cstart, unsigned int *cend);
60 const struct config_item_type *
61 get_policy_node_type(struct configfs_attribute **attrs);
67 unsigned int nr_chans;
72 struct stm_device *stm;
73 struct stm_output output;
76 struct stm_device *stm_find_device(const char *name);
77 void stm_put_device(struct stm_device *stm);
79 struct stm_source_device {
81 struct stm_source_data *data;
83 struct stm_device __rcu *link;
84 struct list_head link_entry;
85 /* one output per stm_source device */
86 struct stm_output output;
89 #define to_stm_source_device(_d) \
90 container_of((_d), struct stm_source_device, dev)
92 void *to_pdrv_policy_node(struct config_item *item);
94 struct stm_protocol_driver {
97 ssize_t (*write)(struct stm_data *data,
98 struct stm_output *output, unsigned int chan,
99 const char *buf, size_t count);
100 void (*policy_node_init)(void *arg);
101 int (*output_open)(void *priv, struct stm_output *output);
102 void (*output_close)(struct stm_output *output);
104 struct configfs_attribute **policy_attr;
107 int stm_register_protocol(const struct stm_protocol_driver *pdrv);
108 void stm_unregister_protocol(const struct stm_protocol_driver *pdrv);
109 int stm_lookup_protocol(const char *name,
110 const struct stm_protocol_driver **pdrv,
111 const struct config_item_type **type);
112 void stm_put_protocol(const struct stm_protocol_driver *pdrv);
113 ssize_t stm_data_write(struct stm_data *data, unsigned int m,
114 unsigned int c, bool ts_first, const void *buf,
117 #endif /* _STM_STM_H_ */