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