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