include/linux/platform_device.h

   1 /*
   2  * platform_device.h - generic, centralized driver model
   3  *
   4  * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
   5  *
   6  * This file is released under the GPLv2
   7  *
   8  * See Documentation/driver-model/ for more information.
   9  */
  10
  11 #ifndef _PLATFORM_DEVICE_H_
  12 #define _PLATFORM_DEVICE_H_
  13
  14 #include <linux/device.h>
  15 #include <linux/mod_devicetable.h>
  16
  17 #define PLATFORM_DEVID_NONE     (-1)
  18 #define PLATFORM_DEVID_AUTO     (-2)
  19
  20 struct mfd_cell;
  21
  22 struct platform_device {
  23         const char      *name;
  24         int             id;
  25         bool            id_auto;
  26         struct device   dev;
  27         u32             num_resources;
  28         struct resource *resource;
  29
  30         const struct platform_device_id *id_entry;
  31         char *driver_override; /* Driver name to force a match */
  32
  33         /* MFD cell pointer */
  34         struct mfd_cell *mfd_cell;
  35
  36         /* arch specific additions */
  37         struct pdev_archdata    archdata;
  38 };
  39
  40 #define platform_get_device_id(pdev)    ((pdev)->id_entry)
  41
  42 #define to_platform_device(x) container_of((x), struct platform_device, dev)
  43
  44 extern int platform_device_register(struct platform_device *);
  45 extern void platform_device_unregister(struct platform_device *);
  46
  47 extern struct bus_type platform_bus_type;
  48 extern struct device platform_bus;
  49
  50 extern void arch_setup_pdev_archdata(struct platform_device *);
  51 extern struct resource *platform_get_resource(struct platform_device *,
  52                                               unsigned int, unsigned int);
  53 extern int platform_get_irq(struct platform_device *, unsigned int);
  54 extern struct resource *platform_get_resource_byname(struct platform_device *,
  55                                                      unsigned int,
  56                                                      const char *);
  57 extern int platform_get_irq_byname(struct platform_device *, const char *);
  58 extern int platform_add_devices(struct platform_device **, int);
  59
  60 struct platform_device_info {
  61                 struct device *parent;
  62                 struct acpi_dev_node acpi_node;
  63
  64                 const char *name;
  65                 int id;
  66
  67                 const struct resource *res;
  68                 unsigned int num_res;
  69
  70                 const void *data;
  71                 size_t size_data;
  72                 u64 dma_mask;
  73 };
  74 extern struct platform_device *platform_device_register_full(
  75                 const struct platform_device_info *pdevinfo);
  76
  77 /**
  78  * platform_device_register_resndata - add a platform-level device with
  79  * resources and platform-specific data
  80  *
  81  * @parent: parent device for the device we're adding
  82  * @name: base name of the device we're adding
  83  * @id: instance id
  84  * @res: set of resources that needs to be allocated for the device
  85  * @num: number of resources
  86  * @data: platform specific data for this platform device
  87  * @size: size of platform specific data
  88  *
  89  * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
  90  */
  91 static inline struct platform_device *platform_device_register_resndata(
  92                 struct device *parent, const char *name, int id,
  93                 const struct resource *res, unsigned int num,
  94                 const void *data, size_t size) {
  95
  96         struct platform_device_info pdevinfo = {
  97                 .parent = parent,
  98                 .name = name,
  99                 .id = id,
 100                 .res = res,
 101                 .num_res = num,
 102                 .data = data,
 103                 .size_data = size,
 104                 .dma_mask = 0,
 105         };
 106
 107         return platform_device_register_full(&pdevinfo);
 108 }
 109
 110 /**
 111  * platform_device_register_simple - add a platform-level device and its resources
 112  * @name: base name of the device we're adding
 113  * @id: instance id
 114  * @res: set of resources that needs to be allocated for the device
 115  * @num: number of resources
 116  *
 117  * This function creates a simple platform device that requires minimal
 118  * resource and memory management. Canned release function freeing memory
 119  * allocated for the device allows drivers using such devices to be
 120  * unloaded without waiting for the last reference to the device to be
 121  * dropped.
 122  *
 123  * This interface is primarily intended for use with legacy drivers which
 124  * probe hardware directly.  Because such drivers create sysfs device nodes
 125  * themselves, rather than letting system infrastructure handle such device
 126  * enumeration tasks, they don't fully conform to the Linux driver model.
 127  * In particular, when such drivers are built as modules, they can't be
 128  * "hotplugged".
 129  *
 130  * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
 131  */
 132 static inline struct platform_device *platform_device_register_simple(
 133                 const char *name, int id,
 134                 const struct resource *res, unsigned int num)
 135 {
 136         return platform_device_register_resndata(NULL, name, id,
 137                         res, num, NULL, 0);
 138 }
 139
 140 /**
 141  * platform_device_register_data - add a platform-level device with platform-specific data
 142  * @parent: parent device for the device we're adding
 143  * @name: base name of the device we're adding
 144  * @id: instance id
 145  * @data: platform specific data for this platform device
 146  * @size: size of platform specific data
 147  *
 148  * This function creates a simple platform device that requires minimal
 149  * resource and memory management. Canned release function freeing memory
 150  * allocated for the device allows drivers using such devices to be
 151  * unloaded without waiting for the last reference to the device to be
 152  * dropped.
 153  *
 154  * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
 155  */
 156 static inline struct platform_device *platform_device_register_data(
 157                 struct device *parent, const char *name, int id,
 158                 const void *data, size_t size)
 159 {
 160         return platform_device_register_resndata(parent, name, id,
 161                         NULL, 0, data, size);
 162 }
 163
 164 extern struct platform_device *platform_device_alloc(const char *name, int id);
 165 extern int platform_device_add_resources(struct platform_device *pdev,
 166                                          const struct resource *res,
 167                                          unsigned int num);
 168 extern int platform_device_add_data(struct platform_device *pdev,
 169                                     const void *data, size_t size);
 170 extern int platform_device_add(struct platform_device *pdev);
 171 extern void platform_device_del(struct platform_device *pdev);
 172 extern void platform_device_put(struct platform_device *pdev);
 173
 174 struct platform_driver {
 175         int (*probe)(struct platform_device *);
 176         int (*remove)(struct platform_device *);
 177         void (*shutdown)(struct platform_device *);
 178         int (*suspend)(struct platform_device *, pm_message_t state);
 179         int (*resume)(struct platform_device *);
 180         struct device_driver driver;
 181         const struct platform_device_id *id_table;
 182         bool prevent_deferred_probe;
 183 };
 184
 185 #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
 186                                  driver))
 187
 188 /*
 189  * use a macro to avoid include chaining to get THIS_MODULE
 190  */
 191 #define platform_driver_register(drv) \
 192         __platform_driver_register(drv, THIS_MODULE)
 193 extern int __platform_driver_register(struct platform_driver *,
 194                                         struct module *);
 195 extern void platform_driver_unregister(struct platform_driver *);
 196
 197 /* non-hotpluggable platform devices may use this so that probe() and
 198  * its support may live in __init sections, conserving runtime memory.
 199  */
 200 #define platform_driver_probe(drv, probe) \
 201         __platform_driver_probe(drv, probe, THIS_MODULE)
 202 extern int __platform_driver_probe(struct platform_driver *driver,
 203                 int (*probe)(struct platform_device *), struct module *module);
 204
 205 static inline void *platform_get_drvdata(const struct platform_device *pdev)
 206 {
 207         return dev_get_drvdata(&pdev->dev);
 208 }
 209
 210 static inline void platform_set_drvdata(struct platform_device *pdev,
 211                                         void *data)
 212 {
 213         dev_set_drvdata(&pdev->dev, data);
 214 }
 215
 216 /* module_platform_driver() - Helper macro for drivers that don't do
 217  * anything special in module init/exit.  This eliminates a lot of
 218  * boilerplate.  Each module may only use this macro once, and
 219  * calling it replaces module_init() and module_exit()
 220  */
 221 #define module_platform_driver(__platform_driver) \
 222         module_driver(__platform_driver, platform_driver_register, \
 223                         platform_driver_unregister)
 224
 225 /* module_platform_driver_probe() - Helper macro for drivers that don't do
 226  * anything special in module init/exit.  This eliminates a lot of
 227  * boilerplate.  Each module may only use this macro once, and
 228  * calling it replaces module_init() and module_exit()
 229  */
 230 #define module_platform_driver_probe(__platform_driver, __platform_probe) \
 231 static int __init __platform_driver##_init(void) \
 232 { \
 233         return platform_driver_probe(&(__platform_driver), \
 234                                      __platform_probe);    \
 235 } \
 236 module_init(__platform_driver##_init); \
 237 static void __exit __platform_driver##_exit(void) \
 238 { \
 239         platform_driver_unregister(&(__platform_driver)); \
 240 } \
 241 module_exit(__platform_driver##_exit);
 242
 243 #define platform_create_bundle(driver, probe, res, n_res, data, size) \
 244         __platform_create_bundle(driver, probe, res, n_res, data, size, THIS_MODULE)
 245 extern struct platform_device *__platform_create_bundle(
 246         struct platform_driver *driver, int (*probe)(struct platform_device *),
 247         struct resource *res, unsigned int n_res,
 248         const void *data, size_t size, struct module *module);
 249
 250 /* early platform driver interface */
 251 struct early_platform_driver {
 252         const char *class_str;
 253         struct platform_driver *pdrv;
 254         struct list_head list;
 255         int requested_id;
 256         char *buffer;
 257         int bufsize;
 258 };
 259
 260 #define EARLY_PLATFORM_ID_UNSET -2
 261 #define EARLY_PLATFORM_ID_ERROR -3
 262
 263 extern int early_platform_driver_register(struct early_platform_driver *epdrv,
 264                                           char *buf);
 265 extern void early_platform_add_devices(struct platform_device **devs, int num);
 266
 267 static inline int is_early_platform_device(struct platform_device *pdev)
 268 {
 269         return !pdev->dev.driver;
 270 }
 271
 272 extern void early_platform_driver_register_all(char *class_str);
 273 extern int early_platform_driver_probe(char *class_str,
 274                                        int nr_probe, int user_only);
 275 extern void early_platform_cleanup(void);
 276
 277 #define early_platform_init(class_string, platdrv)              \
 278         early_platform_init_buffer(class_string, platdrv, NULL, 0)
 279
 280 #ifndef MODULE
 281 #define early_platform_init_buffer(class_string, platdrv, buf, bufsiz)  \
 282 static __initdata struct early_platform_driver early_driver = {         \
 283         .class_str = class_string,                                      \
 284         .buffer = buf,                                                  \
 285         .bufsize = bufsiz,                                              \
 286         .pdrv = platdrv,                                                \
 287         .requested_id = EARLY_PLATFORM_ID_UNSET,                        \
 288 };                                                                      \
 289 static int __init early_platform_driver_setup_func(char *buffer)        \
 290 {                                                                       \
 291         return early_platform_driver_register(&early_driver, buffer);   \
 292 }                                                                       \
 293 early_param(class_string, early_platform_driver_setup_func)
 294 #else /* MODULE */
 295 #define early_platform_init_buffer(class_string, platdrv, buf, bufsiz)  \
 296 static inline char *early_platform_driver_setup_func(void)              \
 297 {                                                                       \
 298         return bufsiz ? buf : NULL;                                     \
 299 }
 300 #endif /* MODULE */
 301
 302 #ifdef CONFIG_SUSPEND
 303 extern int platform_pm_suspend(struct device *dev);
 304 extern int platform_pm_resume(struct device *dev);
 305 #else
 306 #define platform_pm_suspend             NULL
 307 #define platform_pm_resume              NULL
 308 #endif
 309
 310 #ifdef CONFIG_HIBERNATE_CALLBACKS
 311 extern int platform_pm_freeze(struct device *dev);
 312 extern int platform_pm_thaw(struct device *dev);
 313 extern int platform_pm_poweroff(struct device *dev);
 314 extern int platform_pm_restore(struct device *dev);
 315 #else
 316 #define platform_pm_freeze              NULL
 317 #define platform_pm_thaw                NULL
 318 #define platform_pm_poweroff            NULL
 319 #define platform_pm_restore             NULL
 320 #endif
 321
 322 #ifdef CONFIG_PM_SLEEP
 323 #define USE_PLATFORM_PM_SLEEP_OPS \
 324         .suspend = platform_pm_suspend, \
 325         .resume = platform_pm_resume, \
 326         .freeze = platform_pm_freeze, \
 327         .thaw = platform_pm_thaw, \
 328         .poweroff = platform_pm_poweroff, \
 329         .restore = platform_pm_restore,
 330 #else
 331 #define USE_PLATFORM_PM_SLEEP_OPS
 332 #endif
 333
 334 #endif /* _PLATFORM_DEVICE_H_ */