root/include/linux/platform_device.h

INCLUDED FROM

DEFINITIONS

1. platform_device_register_resndata
2. platform_device_register_simple
3. platform_device_register_data
4. platform_get_drvdata
5. platform_set_drvdata
6. is_early_platform_device

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * platform_device.h - generic, centralized driver model
   4  *
   5  * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
   6  *
   7  * See Documentation/driver-api/driver-model/ for more information.
   8  */
   9 
  10 #ifndef _PLATFORM_DEVICE_H_
  11 #define _PLATFORM_DEVICE_H_
  12 
  13 #include <linux/device.h>
  14 
  15 #define PLATFORM_DEVID_NONE     (-1)
  16 #define PLATFORM_DEVID_AUTO     (-2)
  17 
  18 struct mfd_cell;
  19 struct property_entry;
  20 struct platform_device_id;
  21 
  22 struct platform_device {
  23         const char      *name;
  24         int             id;
  25         bool            id_auto;
  26         struct device   dev;
  27         u64             platform_dma_mask;
  28         u32             num_resources;
  29         struct resource *resource;
  30 
  31         const struct platform_device_id *id_entry;
  32         char *driver_override; /* Driver name to force a match */
  33 
  34         /* MFD cell pointer */
  35         struct mfd_cell *mfd_cell;
  36 
  37         /* arch specific additions */
  38         struct pdev_archdata    archdata;
  39 };
  40 
  41 #define platform_get_device_id(pdev)    ((pdev)->id_entry)
  42 
  43 #define dev_is_platform(dev) ((dev)->bus == &platform_bus_type)
  44 #define to_platform_device(x) container_of((x), struct platform_device, dev)
  45 
  46 extern int platform_device_register(struct platform_device *);
  47 extern void platform_device_unregister(struct platform_device *);
  48 
  49 extern struct bus_type platform_bus_type;
  50 extern struct device platform_bus;
  51 
  52 extern struct resource *platform_get_resource(struct platform_device *,
  53                                               unsigned int, unsigned int);
  54 extern struct device *
  55 platform_find_device_by_driver(struct device *start,
  56                                const struct device_driver *drv);
  57 extern void __iomem *
  58 devm_platform_ioremap_resource(struct platform_device *pdev,
  59                                unsigned int index);
  60 extern int platform_get_irq(struct platform_device *, unsigned int);
  61 extern int platform_get_irq_optional(struct platform_device *, unsigned int);
  62 extern int platform_irq_count(struct platform_device *);
  63 extern struct resource *platform_get_resource_byname(struct platform_device *,
  64                                                      unsigned int,
  65                                                      const char *);
  66 extern int platform_get_irq_byname(struct platform_device *, const char *);
  67 extern int platform_get_irq_byname_optional(struct platform_device *dev,
  68                                             const char *name);
  69 extern int platform_add_devices(struct platform_device **, int);
  70 
  71 struct platform_device_info {
  72                 struct device *parent;
  73                 struct fwnode_handle *fwnode;
  74                 bool of_node_reused;
  75 
  76                 const char *name;
  77                 int id;
  78 
  79                 const struct resource *res;
  80                 unsigned int num_res;
  81 
  82                 const void *data;
  83                 size_t size_data;
  84                 u64 dma_mask;
  85 
  86                 struct property_entry *properties;
  87 };
  88 extern struct platform_device *platform_device_register_full(
  89                 const struct platform_device_info *pdevinfo);
  90 
  91 /**
  92  * platform_device_register_resndata - add a platform-level device with
  93  * resources and platform-specific data
  94  *
  95  * @parent: parent device for the device we're adding
  96  * @name: base name of the device we're adding
  97  * @id: instance id
  98  * @res: set of resources that needs to be allocated for the device
  99  * @num: number of resources
 100  * @data: platform specific data for this platform device
 101  * @size: size of platform specific data
 102  *
 103  * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
 104  */
 105 static inline struct platform_device *platform_device_register_resndata(
 106                 struct device *parent, const char *name, int id,
 107                 const struct resource *res, unsigned int num,
 108                 const void *data, size_t size) {
 109 
 110         struct platform_device_info pdevinfo = {
 111                 .parent = parent,
 112                 .name = name,
 113                 .id = id,
 114                 .res = res,
 115                 .num_res = num,
 116                 .data = data,
 117                 .size_data = size,
 118                 .dma_mask = 0,
 119         };
 120 
 121         return platform_device_register_full(&pdevinfo);
 122 }
 123 
 124 /**
 125  * platform_device_register_simple - add a platform-level device and its resources
 126  * @name: base name of the device we're adding
 127  * @id: instance id
 128  * @res: set of resources that needs to be allocated for the device
 129  * @num: number of resources
 130  *
 131  * This function creates a simple platform device that requires minimal
 132  * resource and memory management. Canned release function freeing memory
 133  * allocated for the device allows drivers using such devices to be
 134  * unloaded without waiting for the last reference to the device to be
 135  * dropped.
 136  *
 137  * This interface is primarily intended for use with legacy drivers which
 138  * probe hardware directly.  Because such drivers create sysfs device nodes
 139  * themselves, rather than letting system infrastructure handle such device
 140  * enumeration tasks, they don't fully conform to the Linux driver model.
 141  * In particular, when such drivers are built as modules, they can't be
 142  * "hotplugged".
 143  *
 144  * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
 145  */
 146 static inline struct platform_device *platform_device_register_simple(
 147                 const char *name, int id,
 148                 const struct resource *res, unsigned int num)
 149 {
 150         return platform_device_register_resndata(NULL, name, id,
 151                         res, num, NULL, 0);
 152 }
 153 
 154 /**
 155  * platform_device_register_data - add a platform-level device with platform-specific data
 156  * @parent: parent device for the device we're adding
 157  * @name: base name of the device we're adding
 158  * @id: instance id
 159  * @data: platform specific data for this platform device
 160  * @size: size of platform specific data
 161  *
 162  * This function creates a simple platform device that requires minimal
 163  * resource and memory management. Canned release function freeing memory
 164  * allocated for the device allows drivers using such devices to be
 165  * unloaded without waiting for the last reference to the device to be
 166  * dropped.
 167  *
 168  * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
 169  */
 170 static inline struct platform_device *platform_device_register_data(
 171                 struct device *parent, const char *name, int id,
 172                 const void *data, size_t size)
 173 {
 174         return platform_device_register_resndata(parent, name, id,
 175                         NULL, 0, data, size);
 176 }
 177 
 178 extern struct platform_device *platform_device_alloc(const char *name, int id);
 179 extern int platform_device_add_resources(struct platform_device *pdev,
 180                                          const struct resource *res,
 181                                          unsigned int num);
 182 extern int platform_device_add_data(struct platform_device *pdev,
 183                                     const void *data, size_t size);
 184 extern int platform_device_add_properties(struct platform_device *pdev,
 185                                 const struct property_entry *properties);
 186 extern int platform_device_add(struct platform_device *pdev);
 187 extern void platform_device_del(struct platform_device *pdev);
 188 extern void platform_device_put(struct platform_device *pdev);
 189 
 190 struct platform_driver {
 191         int (*probe)(struct platform_device *);
 192         int (*remove)(struct platform_device *);
 193         void (*shutdown)(struct platform_device *);
 194         int (*suspend)(struct platform_device *, pm_message_t state);
 195         int (*resume)(struct platform_device *);
 196         struct device_driver driver;
 197         const struct platform_device_id *id_table;
 198         bool prevent_deferred_probe;
 199 };
 200 
 201 #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
 202                                  driver))
 203 
 204 /*
 205  * use a macro to avoid include chaining to get THIS_MODULE
 206  */
 207 #define platform_driver_register(drv) \
 208         __platform_driver_register(drv, THIS_MODULE)
 209 extern int __platform_driver_register(struct platform_driver *,
 210                                         struct module *);
 211 extern void platform_driver_unregister(struct platform_driver *);
 212 
 213 /* non-hotpluggable platform devices may use this so that probe() and
 214  * its support may live in __init sections, conserving runtime memory.
 215  */
 216 #define platform_driver_probe(drv, probe) \
 217         __platform_driver_probe(drv, probe, THIS_MODULE)
 218 extern int __platform_driver_probe(struct platform_driver *driver,
 219                 int (*probe)(struct platform_device *), struct module *module);
 220 
 221 static inline void *platform_get_drvdata(const struct platform_device *pdev)
 222 {
 223         return dev_get_drvdata(&pdev->dev);
 224 }
 225 
 226 static inline void platform_set_drvdata(struct platform_device *pdev,
 227                                         void *data)
 228 {
 229         dev_set_drvdata(&pdev->dev, data);
 230 }
 231 
 232 /* module_platform_driver() - Helper macro for drivers that don't do
 233  * anything special in module init/exit.  This eliminates a lot of
 234  * boilerplate.  Each module may only use this macro once, and
 235  * calling it replaces module_init() and module_exit()
 236  */
 237 #define module_platform_driver(__platform_driver) \
 238         module_driver(__platform_driver, platform_driver_register, \
 239                         platform_driver_unregister)
 240 
 241 /* builtin_platform_driver() - Helper macro for builtin drivers that
 242  * don't do anything special in driver init.  This eliminates some
 243  * boilerplate.  Each driver may only use this macro once, and
 244  * calling it replaces device_initcall().  Note this is meant to be
 245  * a parallel of module_platform_driver() above, but w/o _exit stuff.
 246  */
 247 #define builtin_platform_driver(__platform_driver) \
 248         builtin_driver(__platform_driver, platform_driver_register)
 249 
 250 /* module_platform_driver_probe() - Helper macro for drivers that don't do
 251  * anything special in module init/exit.  This eliminates a lot of
 252  * boilerplate.  Each module may only use this macro once, and
 253  * calling it replaces module_init() and module_exit()
 254  */
 255 #define module_platform_driver_probe(__platform_driver, __platform_probe) \
 256 static int __init __platform_driver##_init(void) \
 257 { \
 258         return platform_driver_probe(&(__platform_driver), \
 259                                      __platform_probe);    \
 260 } \
 261 module_init(__platform_driver##_init); \
 262 static void __exit __platform_driver##_exit(void) \
 263 { \
 264         platform_driver_unregister(&(__platform_driver)); \
 265 } \
 266 module_exit(__platform_driver##_exit);
 267 
 268 /* builtin_platform_driver_probe() - Helper macro for drivers that don't do
 269  * anything special in device init.  This eliminates some boilerplate.  Each
 270  * driver may only use this macro once, and using it replaces device_initcall.
 271  * This is meant to be a parallel of module_platform_driver_probe above, but
 272  * without the __exit parts.
 273  */
 274 #define builtin_platform_driver_probe(__platform_driver, __platform_probe) \
 275 static int __init __platform_driver##_init(void) \
 276 { \
 277         return platform_driver_probe(&(__platform_driver), \
 278                                      __platform_probe);    \
 279 } \
 280 device_initcall(__platform_driver##_init); \
 281 
 282 #define platform_create_bundle(driver, probe, res, n_res, data, size) \
 283         __platform_create_bundle(driver, probe, res, n_res, data, size, THIS_MODULE)
 284 extern struct platform_device *__platform_create_bundle(
 285         struct platform_driver *driver, int (*probe)(struct platform_device *),
 286         struct resource *res, unsigned int n_res,
 287         const void *data, size_t size, struct module *module);
 288 
 289 int __platform_register_drivers(struct platform_driver * const *drivers,
 290                                 unsigned int count, struct module *owner);
 291 void platform_unregister_drivers(struct platform_driver * const *drivers,
 292                                  unsigned int count);
 293 
 294 #define platform_register_drivers(drivers, count) \
 295         __platform_register_drivers(drivers, count, THIS_MODULE)
 296 
 297 /* early platform driver interface */
 298 struct early_platform_driver {
 299         const char *class_str;
 300         struct platform_driver *pdrv;
 301         struct list_head list;
 302         int requested_id;
 303         char *buffer;
 304         int bufsize;
 305 };
 306 
 307 #define EARLY_PLATFORM_ID_UNSET -2
 308 #define EARLY_PLATFORM_ID_ERROR -3
 309 
 310 extern int early_platform_driver_register(struct early_platform_driver *epdrv,
 311                                           char *buf);
 312 extern void early_platform_add_devices(struct platform_device **devs, int num);
 313 
 314 static inline int is_early_platform_device(struct platform_device *pdev)
 315 {
 316         return !pdev->dev.driver;
 317 }
 318 
 319 extern void early_platform_driver_register_all(char *class_str);
 320 extern int early_platform_driver_probe(char *class_str,
 321                                        int nr_probe, int user_only);
 322 extern void early_platform_cleanup(void);
 323 
 324 #define early_platform_init(class_string, platdrv)              \
 325         early_platform_init_buffer(class_string, platdrv, NULL, 0)
 326 
 327 #ifndef MODULE
 328 #define early_platform_init_buffer(class_string, platdrv, buf, bufsiz)  \
 329 static __initdata struct early_platform_driver early_driver = {         \
 330         .class_str = class_string,                                      \
 331         .buffer = buf,                                                  \
 332         .bufsize = bufsiz,                                              \
 333         .pdrv = platdrv,                                                \
 334         .requested_id = EARLY_PLATFORM_ID_UNSET,                        \
 335 };                                                                      \
 336 static int __init early_platform_driver_setup_func(char *buffer)        \
 337 {                                                                       \
 338         return early_platform_driver_register(&early_driver, buffer);   \
 339 }                                                                       \
 340 early_param(class_string, early_platform_driver_setup_func)
 341 #else /* MODULE */
 342 #define early_platform_init_buffer(class_string, platdrv, buf, bufsiz)  \
 343 static inline char *early_platform_driver_setup_func(void)              \
 344 {                                                                       \
 345         return bufsiz ? buf : NULL;                                     \
 346 }
 347 #endif /* MODULE */
 348 
 349 #ifdef CONFIG_SUSPEND
 350 extern int platform_pm_suspend(struct device *dev);
 351 extern int platform_pm_resume(struct device *dev);
 352 #else
 353 #define platform_pm_suspend             NULL
 354 #define platform_pm_resume              NULL
 355 #endif
 356 
 357 #ifdef CONFIG_HIBERNATE_CALLBACKS
 358 extern int platform_pm_freeze(struct device *dev);
 359 extern int platform_pm_thaw(struct device *dev);
 360 extern int platform_pm_poweroff(struct device *dev);
 361 extern int platform_pm_restore(struct device *dev);
 362 #else
 363 #define platform_pm_freeze              NULL
 364 #define platform_pm_thaw                NULL
 365 #define platform_pm_poweroff            NULL
 366 #define platform_pm_restore             NULL
 367 #endif
 368 
 369 extern int platform_dma_configure(struct device *dev);
 370 
 371 #ifdef CONFIG_PM_SLEEP
 372 #define USE_PLATFORM_PM_SLEEP_OPS \
 373         .suspend = platform_pm_suspend, \
 374         .resume = platform_pm_resume, \
 375         .freeze = platform_pm_freeze, \
 376         .thaw = platform_pm_thaw, \
 377         .poweroff = platform_pm_poweroff, \
 378         .restore = platform_pm_restore,
 379 #else
 380 #define USE_PLATFORM_PM_SLEEP_OPS
 381 #endif
 382 
 383 #endif /* _PLATFORM_DEVICE_H_ */