drivers/staging/greybus/greybus.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Greybus driver and device API
   4  *
   5  * Copyright 2014-2015 Google Inc.
   6  * Copyright 2014-2015 Linaro Ltd.
   7  */
   8
   9 #ifndef __LINUX_GREYBUS_H
  10 #define __LINUX_GREYBUS_H
  11
  12 #ifdef __KERNEL__
  13
  14 #include <linux/kernel.h>
  15 #include <linux/types.h>
  16 #include <linux/list.h>
  17 #include <linux/slab.h>
  18 #include <linux/device.h>
  19 #include <linux/module.h>
  20 #include <linux/pm_runtime.h>
  21 #include <linux/idr.h>
  22
  23 #include "greybus_id.h"
  24 #include "greybus_manifest.h"
  25 #include "greybus_protocols.h"
  26 #include "manifest.h"
  27 #include "hd.h"
  28 #include "svc.h"
  29 #include "control.h"
  30 #include "module.h"
  31 #include "interface.h"
  32 #include "bundle.h"
  33 #include "connection.h"
  34 #include "operation.h"
  35
  36 /* Matches up with the Greybus Protocol specification document */
  37 #define GREYBUS_VERSION_MAJOR   0x00
  38 #define GREYBUS_VERSION_MINOR   0x01
  39
  40 #define GREYBUS_ID_MATCH_DEVICE \
  41         (GREYBUS_ID_MATCH_VENDOR | GREYBUS_ID_MATCH_PRODUCT)
  42
  43 #define GREYBUS_DEVICE(v, p)                                    \
  44         .match_flags    = GREYBUS_ID_MATCH_DEVICE,              \
  45         .vendor         = (v),                                  \
  46         .product        = (p),
  47
  48 #define GREYBUS_DEVICE_CLASS(c)                                 \
  49         .match_flags    = GREYBUS_ID_MATCH_CLASS,               \
  50         .class          = (c),
  51
  52 /* Maximum number of CPorts */
  53 #define CPORT_ID_MAX    4095            /* UniPro max id is 4095 */
  54 #define CPORT_ID_BAD    U16_MAX
  55
  56 struct greybus_driver {
  57         const char *name;
  58
  59         int (*probe)(struct gb_bundle *bundle,
  60                      const struct greybus_bundle_id *id);
  61         void (*disconnect)(struct gb_bundle *bundle);
  62
  63         const struct greybus_bundle_id *id_table;
  64
  65         struct device_driver driver;
  66 };
  67 #define to_greybus_driver(d) container_of(d, struct greybus_driver, driver)
  68
  69 static inline void greybus_set_drvdata(struct gb_bundle *bundle, void *data)
  70 {
  71         dev_set_drvdata(&bundle->dev, data);
  72 }
  73
  74 static inline void *greybus_get_drvdata(struct gb_bundle *bundle)
  75 {
  76         return dev_get_drvdata(&bundle->dev);
  77 }
  78
  79 /* Don't call these directly, use the module_greybus_driver() macro instead */
  80 int greybus_register_driver(struct greybus_driver *driver,
  81                             struct module *module, const char *mod_name);
  82 void greybus_deregister_driver(struct greybus_driver *driver);
  83
  84 /* define to get proper THIS_MODULE and KBUILD_MODNAME values */
  85 #define greybus_register(driver) \
  86         greybus_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)
  87 #define greybus_deregister(driver) \
  88         greybus_deregister_driver(driver)
  89
  90 /**
  91  * module_greybus_driver() - Helper macro for registering a Greybus driver
  92  * @__greybus_driver: greybus_driver structure
  93  *
  94  * Helper macro for Greybus drivers to set up proper module init / exit
  95  * functions.  Replaces module_init() and module_exit() and keeps people from
  96  * printing pointless things to the kernel log when their driver is loaded.
  97  */
  98 #define module_greybus_driver(__greybus_driver) \
  99         module_driver(__greybus_driver, greybus_register, greybus_deregister)
 100
 101 int greybus_disabled(void);
 102
 103 void gb_debugfs_init(void);
 104 void gb_debugfs_cleanup(void);
 105 struct dentry *gb_debugfs_get(void);
 106
 107 extern struct bus_type greybus_bus_type;
 108
 109 extern struct device_type greybus_hd_type;
 110 extern struct device_type greybus_module_type;
 111 extern struct device_type greybus_interface_type;
 112 extern struct device_type greybus_control_type;
 113 extern struct device_type greybus_bundle_type;
 114 extern struct device_type greybus_svc_type;
 115
 116 static inline int is_gb_host_device(const struct device *dev)
 117 {
 118         return dev->type == &greybus_hd_type;
 119 }
 120
 121 static inline int is_gb_module(const struct device *dev)
 122 {
 123         return dev->type == &greybus_module_type;
 124 }
 125
 126 static inline int is_gb_interface(const struct device *dev)
 127 {
 128         return dev->type == &greybus_interface_type;
 129 }
 130
 131 static inline int is_gb_control(const struct device *dev)
 132 {
 133         return dev->type == &greybus_control_type;
 134 }
 135
 136 static inline int is_gb_bundle(const struct device *dev)
 137 {
 138         return dev->type == &greybus_bundle_type;
 139 }
 140
 141 static inline int is_gb_svc(const struct device *dev)
 142 {
 143         return dev->type == &greybus_svc_type;
 144 }
 145
 146 static inline bool cport_id_valid(struct gb_host_device *hd, u16 cport_id)
 147 {
 148         return cport_id != CPORT_ID_BAD && cport_id < hd->num_cports;
 149 }
 150
 151 #endif /* __KERNEL__ */
 152 #endif /* __LINUX_GREYBUS_H */