1 /* 2 * platform_device.h - generic, centralized driver model 3 * 4 * Copyright (c) 2001-2003 Patrick Mochel <[email protected]> 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_ */ 209