include/linux/platform_device.h

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