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 struct resource *platform_get_resource(struct platform_device *, unsigned int, unsigned int);
  46 extern int platform_get_irq(struct platform_device *, unsigned int);
  47 extern struct resource *platform_get_resource_byname(struct platform_device *, unsigned int, const char *);
  48 extern int platform_get_irq_byname(struct platform_device *, const char *);
  49 extern int platform_add_devices(struct platform_device **, int);
  50
  51 extern struct platform_device *platform_device_register_resndata(
  52                 struct device *parent, const char *name, int id,
  53                 const struct resource *res, unsigned int num,
  54                 const void *data, size_t size);
  55
  56 /**
  57  * platform_device_register_simple - add a platform-level device and its resources
  58  * @name: base name of the device we're adding
  59  * @id: instance id
  60  * @res: set of resources that needs to be allocated for the device
  61  * @num: number of resources
  62  *
  63  * This function creates a simple platform device that requires minimal
  64  * resource and memory management. Canned release function freeing memory
  65  * allocated for the device allows drivers using such devices to be
  66  * unloaded without waiting for the last reference to the device to be
  67  * dropped.
  68  *
  69  * This interface is primarily intended for use with legacy drivers which
  70  * probe hardware directly.  Because such drivers create sysfs device nodes
  71  * themselves, rather than letting system infrastructure handle such device
  72  * enumeration tasks, they don't fully conform to the Linux driver model.
  73  * In particular, when such drivers are built as modules, they can't be
  74  * "hotplugged".
  75  *
  76  * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
  77  */
  78 static inline struct platform_device *platform_device_register_simple(
  79                 const char *name, int id,
  80                 const struct resource *res, unsigned int num)
  81 {
  82         return platform_device_register_resndata(NULL, name, id,
  83                         res, num, NULL, 0);
  84 }
  85
  86 /**
  87  * platform_device_register_data - add a platform-level device with platform-specific data
  88  * @parent: parent device for the device we're adding
  89  * @name: base name of the device we're adding
  90  * @id: instance id
  91  * @data: platform specific data for this platform device
  92  * @size: size of platform specific data
  93  *
  94  * This function creates a simple platform device that requires minimal
  95  * resource and memory management. Canned release function freeing memory
  96  * allocated for the device allows drivers using such devices to be
  97  * unloaded without waiting for the last reference to the device to be
  98  * dropped.
  99  *
 100  * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
 101  */
 102 static inline struct platform_device *platform_device_register_data(
 103                 struct device *parent, const char *name, int id,
 104                 const void *data, size_t size)
 105 {
 106         return platform_device_register_resndata(parent, name, id,
 107                         NULL, 0, data, size);
 108 }
 109
 110 extern struct platform_device *platform_device_alloc(const char *name, int id);
 111 extern int platform_device_add_resources(struct platform_device *pdev,
 112                                          const struct resource *res,
 113                                          unsigned int num);
 114 extern int platform_device_add_data(struct platform_device *pdev, const void *data, size_t size);
 115 extern int platform_device_add(struct platform_device *pdev);
 116 extern void platform_device_del(struct platform_device *pdev);
 117 extern void platform_device_put(struct platform_device *pdev);
 118
 119 struct platform_driver {
 120         int (*probe)(struct platform_device *);
 121         int (*remove)(struct platform_device *);
 122         void (*shutdown)(struct platform_device *);
 123         int (*suspend)(struct platform_device *, pm_message_t state);
 124         int (*resume)(struct platform_device *);
 125         struct device_driver driver;
 126         const struct platform_device_id *id_table;
 127 };
 128
 129 extern int platform_driver_register(struct platform_driver *);
 130 extern void platform_driver_unregister(struct platform_driver *);
 131
 132 /* non-hotpluggable platform devices may use this so that probe() and
 133  * its support may live in __init sections, conserving runtime memory.
 134  */
 135 extern int platform_driver_probe(struct platform_driver *driver,
 136                 int (*probe)(struct platform_device *));
 137
 138 static inline void *platform_get_drvdata(const struct platform_device *pdev)
 139 {
 140         return dev_get_drvdata(&pdev->dev);
 141 }
 142
 143 static inline void platform_set_drvdata(struct platform_device *pdev, void *data)
 144 {
 145         dev_set_drvdata(&pdev->dev, data);
 146 }
 147
 148 extern struct platform_device *platform_create_bundle(struct platform_driver *driver,
 149                                         int (*probe)(struct platform_device *),
 150                                         struct resource *res, unsigned int n_res,
 151                                         const void *data, size_t size);
 152
 153 extern const struct dev_pm_ops * platform_bus_get_pm_ops(void);
 154 extern void platform_bus_set_pm_ops(const struct dev_pm_ops *pm);
 155
 156 /* early platform driver interface */
 157 struct early_platform_driver {
 158         const char *class_str;
 159         struct platform_driver *pdrv;
 160         struct list_head list;
 161         int requested_id;
 162         char *buffer;
 163         int bufsize;
 164 };
 165
 166 #define EARLY_PLATFORM_ID_UNSET -2
 167 #define EARLY_PLATFORM_ID_ERROR -3
 168
 169 extern int early_platform_driver_register(struct early_platform_driver *epdrv,
 170                                           char *buf);
 171 extern void early_platform_add_devices(struct platform_device **devs, int num);
 172
 173 static inline int is_early_platform_device(struct platform_device *pdev)
 174 {
 175         return !pdev->dev.driver;
 176 }
 177
 178 extern void early_platform_driver_register_all(char *class_str);
 179 extern int early_platform_driver_probe(char *class_str,
 180                                        int nr_probe, int user_only);
 181 extern void early_platform_cleanup(void);
 182
 183 #define early_platform_init(class_string, platdrv)              \
 184         early_platform_init_buffer(class_string, platdrv, NULL, 0)
 185
 186 #ifndef MODULE
 187 #define early_platform_init_buffer(class_string, platdrv, buf, bufsiz)  \
 188 static __initdata struct early_platform_driver early_driver = {         \
 189         .class_str = class_string,                                      \
 190         .buffer = buf,                                                  \
 191         .bufsize = bufsiz,                                              \
 192         .pdrv = platdrv,                                                \
 193         .requested_id = EARLY_PLATFORM_ID_UNSET,                        \
 194 };                                                                      \
 195 static int __init early_platform_driver_setup_func(char *buffer)        \
 196 {                                                                       \
 197         return early_platform_driver_register(&early_driver, buffer);   \
 198 }                                                                       \
 199 early_param(class_string, early_platform_driver_setup_func)
 200 #else /* MODULE */
 201 #define early_platform_init_buffer(class_string, platdrv, buf, bufsiz)  \
 202 static inline char *early_platform_driver_setup_func(void)              \
 203 {                                                                       \
 204         return bufsiz ? buf : NULL;                                     \
 205 }
 206 #endif /* MODULE */
 207
 208 #endif /* _PLATFORM_DEVICE_H_ */