Linux/include/linux/auxiliary

Version: ~ [ linux-6.12-rc7 ] ~ [ linux-6.11.7 ] ~ [ linux-6.10.14 ] ~ [ linux-6.9.12 ] ~ [ linux-6.8.12 ] ~ [ linux-6.7.12 ] ~ [ linux-6.6.60 ] ~ [ linux-6.5.13 ] ~ [ linux-6.4.16 ] ~ [ linux-6.3.13 ] ~ [ linux-6.2.16 ] ~ [ linux-6.1.116 ] ~ [ linux-6.0.19 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.171 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.229 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.285 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.323 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.336 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.337 ] ~ [ linux-4.4.302 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.12 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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1 /* SPDX-License-Identifier: GPL-2.0-only */ 1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 2 /* 3 * Copyright (c) 2019-2020 Intel Corporation 3 * Copyright (c) 2019-2020 Intel Corporation 4 * 4 * 5 * Please see Documentation/driver-api/auxilia 5 * Please see Documentation/driver-api/auxiliary_bus.rst for more information. 6 */ 6 */ 7 7 8 #ifndef _AUXILIARY_BUS_H_ 8 #ifndef _AUXILIARY_BUS_H_ 9 #define _AUXILIARY_BUS_H_ 9 #define _AUXILIARY_BUS_H_ 10 10 11 #include <linux/device.h> 11 #include <linux/device.h> 12 #include <linux/mod_devicetable.h> 12 #include <linux/mod_devicetable.h> 13 13 14 /** << 15 * DOC: DEVICE_LIFESPAN << 16 * << 17 * The registering driver is the entity that a << 18 * auxiliary_device and registers it on the au << 19 * note that, as opposed to the platform bus, << 20 * responsible for the management of the memor << 21 * << 22 * To be clear the memory for the auxiliary_de << 23 * callback defined by the registering driver. << 24 * only call auxiliary_device_delete() and the << 25 * it is done with the device. The release() << 26 * called if and when other code releases thei << 27 * << 28 * A parent object, defined in the shared head << 29 * auxiliary_device. It also contains a point << 30 * also is defined in the shared header. Both << 31 * object(s) are allocated by the registering << 32 * auxiliary_driver's registering module to pe << 33 * from the pointer to the auxiliary_device, t << 34 * the auxiliary_driver's probe function, up t << 35 * have access to the shared object(s). << 36 * << 37 * The memory for the shared object(s) must ha << 38 * greater than, the lifespan of the memory fo << 39 * auxiliary_driver should only consider that << 40 * long as the auxiliary_device is still regis << 41 * is up to the registering driver to manage ( << 42 * memory for the shared object beyond the lif << 43 * << 44 * The registering driver must unregister all << 45 * driver.remove() is completed. An easy way << 46 * devm_add_action_or_reset() call to register << 47 * device which unregisters the auxiliary devi << 48 * << 49 * Finally, any operations which operate on th << 50 * to function (if only to return an error) af << 51 * unregisters the auxiliary device. << 52 */ << 53 << 54 /** << 55 * struct auxiliary_device - auxiliary device << 56 * @dev: Device, << 57 * The release and parent fields of the << 58 * in << 59 * @name: Match name found by the auxiliary de << 60 * @id: unique identitier if multiple devices << 61 * @sysfs: embedded struct which hold all sysf << 62 * @sysfs.irqs: irqs xarray contains irq indic << 63 * @sysfs.lock: Synchronize irq sysfs creation << 64 * @sysfs.irq_dir_exists: whether "irqs" direc << 65 * << 66 * An auxiliary_device represents a part of it << 67 * It is given a name that, combined with the << 68 * KBUILD_MODNAME, creates a match_name that i << 69 * id that combined with the match_name provid << 70 * the bus subsystem. For example, a driver r << 71 * named 'foo_mod.ko' and the subdevice is nam << 72 * therefore 'foo_mod.foo_dev'. << 73 * << 74 * Registering an auxiliary_device is a three- << 75 * << 76 * First, a 'struct auxiliary_device' needs to << 77 * sub-device desired. The name, id, dev.rele << 78 * this structure must be filled in as follows << 79 * << 80 * The 'name' field is to be given a name that << 81 * driver. If two auxiliary_devices with the << 82 * "foo_mod.foo_dev", are registered onto the << 83 * values (e.g. "x" and "y") so that the regis << 84 * "foo_mod.foo_dev.x" and "foo_mod.foo_dev.y" << 85 * unique, then the device_add fails and gener << 86 * << 87 * The auxiliary_device.dev.type.release or au << 88 * be populated with a non-NULL pointer to suc << 89 * auxiliary_device. This release call is whe << 90 * auxiliary device must be free'ed. Because << 91 * bus the parent driver can not tell what oth << 92 * this data. << 93 * << 94 * The auxiliary_device.dev.parent should be s << 95 * drivers device. << 96 * << 97 * Second, call auxiliary_device_init(), which << 98 * auxiliary_device struct and performs a devi << 99 * completes, any error state must have a call << 100 * its resolution path. << 101 * << 102 * The third and final step in registering an << 103 * call to auxiliary_device_add(), which sets << 104 * the device to the bus. << 105 * << 106 * .. code-block:: c << 107 * << 108 * #define MY_DEVICE_NAME "foo_dev" << 109 * << 110 * ... << 111 * << 112 * struct auxiliary_device *my_aux_dev = << 113 * << 114 * // Step 1: << 115 * my_aux_dev->name = MY_DEVICE_NAME; << 116 * my_aux_dev->id = my_unique_id_alloc(xx << 117 * my_aux_dev->dev.release = my_aux_dev_r << 118 * my_aux_dev->dev.parent = my_dev; << 119 * << 120 * // Step 2: << 121 * if (auxiliary_device_init(my_aux_dev)) << 122 * goto fail; << 123 * << 124 * // Step 3: << 125 * if (auxiliary_device_add(my_aux_dev)) << 126 * auxiliary_device_uninit(my_aux << 127 * goto fail; << 128 * } << 129 * << 130 * ... << 131 * << 132 * << 133 * Unregistering an auxiliary_device is a two- << 134 * register process. First call auxiliary_dev << 135 * auxiliary_device_uninit(). << 136 * << 137 * .. code-block:: c << 138 * << 139 * auxiliary_device_delete(my_dev->my_ << 140 * auxiliary_device_uninit(my_dev->my_ << 141 */ << 142 struct auxiliary_device { 14 struct auxiliary_device { 143 struct device dev; 15 struct device dev; 144 const char *name; 16 const char *name; 145 u32 id; 17 u32 id; 146 struct { << 147 struct xarray irqs; << 148 struct mutex lock; /* Synchron << 149 bool irq_dir_exists; << 150 } sysfs; << 151 }; 18 }; 152 19 153 /** << 154 * struct auxiliary_driver - Definition of an << 155 * @probe: Called when a matching device is ad << 156 * @remove: Called when device is removed from << 157 * @shutdown: Called at shut-down time to quie << 158 * @suspend: Called to put the device to sleep << 159 * @resume: Called to bring a device from slee << 160 * @name: Driver name. << 161 * @driver: Core driver structure. << 162 * @id_table: Table of devices this driver sho << 163 * << 164 * Auxiliary drivers follow the standard drive << 165 * discovery/enumeration is handled by the cor << 166 * and remove() methods. They support power ma << 167 * notifications using the standard convention << 168 * << 169 * Auxiliary drivers register themselves with << 170 * auxiliary_driver_register(). The id_table c << 171 * auxiliary devices that a driver can bind wi << 172 * << 173 * .. code-block:: c << 174 * << 175 * static const struct auxiliary_devic << 176 * { .name = "foo_mod.foo_dev" << 177 * {}, << 178 * }; << 179 * << 180 * MODULE_DEVICE_TABLE(auxiliary, my_a << 181 * << 182 * struct auxiliary_driver my_drv = { << 183 * .name = "myauxiliarydrv", << 184 * .id_table = my_auxiliary_id << 185 * .probe = my_drv_probe, << 186 * .remove = my_drv_remove << 187 * }; << 188 */ << 189 struct auxiliary_driver { 20 struct auxiliary_driver { 190 int (*probe)(struct auxiliary_device * 21 int (*probe)(struct auxiliary_device *auxdev, const struct auxiliary_device_id *id); 191 void (*remove)(struct auxiliary_device 22 void (*remove)(struct auxiliary_device *auxdev); 192 void (*shutdown)(struct auxiliary_devi 23 void (*shutdown)(struct auxiliary_device *auxdev); 193 int (*suspend)(struct auxiliary_device 24 int (*suspend)(struct auxiliary_device *auxdev, pm_message_t state); 194 int (*resume)(struct auxiliary_device 25 int (*resume)(struct auxiliary_device *auxdev); 195 const char *name; 26 const char *name; 196 struct device_driver driver; 27 struct device_driver driver; 197 const struct auxiliary_device_id *id_t 28 const struct auxiliary_device_id *id_table; 198 }; 29 }; 199 30 200 static inline void *auxiliary_get_drvdata(stru << 201 { << 202 return dev_get_drvdata(&auxdev->dev); << 203 } << 204 << 205 static inline void auxiliary_set_drvdata(struc << 206 { << 207 dev_set_drvdata(&auxdev->dev, data); << 208 } << 209 << 210 static inline struct auxiliary_device *to_auxi 31 static inline struct auxiliary_device *to_auxiliary_dev(struct device *dev) 211 { 32 { 212 return container_of(dev, struct auxili 33 return container_of(dev, struct auxiliary_device, dev); 213 } 34 } 214 35 215 static inline const struct auxiliary_driver *t !! 36 static inline struct auxiliary_driver *to_auxiliary_drv(struct device_driver *drv) 216 { 37 { 217 return container_of(drv, struct auxili 38 return container_of(drv, struct auxiliary_driver, driver); 218 } 39 } 219 40 220 int auxiliary_device_init(struct auxiliary_dev 41 int auxiliary_device_init(struct auxiliary_device *auxdev); 221 int __auxiliary_device_add(struct auxiliary_de 42 int __auxiliary_device_add(struct auxiliary_device *auxdev, const char *modname); 222 #define auxiliary_device_add(auxdev) __auxilia 43 #define auxiliary_device_add(auxdev) __auxiliary_device_add(auxdev, KBUILD_MODNAME) 223 44 224 #ifdef CONFIG_SYSFS << 225 int auxiliary_device_sysfs_irq_add(struct auxi << 226 void auxiliary_device_sysfs_irq_remove(struct << 227 int irq << 228 #else /* CONFIG_SYSFS */ << 229 static inline int << 230 auxiliary_device_sysfs_irq_add(struct auxiliar << 231 { << 232 return 0; << 233 } << 234 << 235 static inline void << 236 auxiliary_device_sysfs_irq_remove(struct auxil << 237 #endif << 238 << 239 static inline void auxiliary_device_uninit(str 45 static inline void auxiliary_device_uninit(struct auxiliary_device *auxdev) 240 { 46 { 241 mutex_destroy(&auxdev->sysfs.lock); << 242 put_device(&auxdev->dev); 47 put_device(&auxdev->dev); 243 } 48 } 244 49 245 static inline void auxiliary_device_delete(str 50 static inline void auxiliary_device_delete(struct auxiliary_device *auxdev) 246 { 51 { 247 device_del(&auxdev->dev); 52 device_del(&auxdev->dev); 248 } 53 } 249 54 250 int __auxiliary_driver_register(struct auxilia 55 int __auxiliary_driver_register(struct auxiliary_driver *auxdrv, struct module *owner, 251 const char *mo 56 const char *modname); 252 #define auxiliary_driver_register(auxdrv) \ 57 #define auxiliary_driver_register(auxdrv) \ 253 __auxiliary_driver_register(auxdrv, TH 58 __auxiliary_driver_register(auxdrv, THIS_MODULE, KBUILD_MODNAME) 254 59 255 void auxiliary_driver_unregister(struct auxili 60 void auxiliary_driver_unregister(struct auxiliary_driver *auxdrv); 256 61 257 /** 62 /** 258 * module_auxiliary_driver() - Helper macro fo 63 * module_auxiliary_driver() - Helper macro for registering an auxiliary driver 259 * @__auxiliary_driver: auxiliary driver struc 64 * @__auxiliary_driver: auxiliary driver struct 260 * 65 * 261 * Helper macro for auxiliary drivers which do 66 * Helper macro for auxiliary drivers which do not do anything special in 262 * module init/exit. This eliminates a lot of 67 * module init/exit. This eliminates a lot of boilerplate. Each module may only 263 * use this macro once, and calling it replace 68 * use this macro once, and calling it replaces module_init() and module_exit() 264 * << 265 * .. code-block:: c << 266 * << 267 * module_auxiliary_driver(my_drv); << 268 */ 69 */ 269 #define module_auxiliary_driver(__auxiliary_dr 70 #define module_auxiliary_driver(__auxiliary_driver) \ 270 module_driver(__auxiliary_driver, auxi 71 module_driver(__auxiliary_driver, auxiliary_driver_register, auxiliary_driver_unregister) 271 72 272 struct auxiliary_device *auxiliary_find_device 73 struct auxiliary_device *auxiliary_find_device(struct device *start, 273 74 const void *data, 274 !! 75 int (*match)(struct device *dev, const void *data)); 275 76 276 #endif /* _AUXILIARY_BUS_H_ */ 77 #endif /* _AUXILIARY_BUS_H_ */ 277 78

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TOMOYO Linux Cross Reference
Linux/include/linux/auxiliary_bus.h

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Differences between /include/linux/auxiliary_bus.h (Version linux-6.12-rc7) and /include/linux/auxiliary_bus.h (Version linux-5.15.171)

TOMOYO Linux Cross Reference Linux/include/linux/auxiliary_bus.h

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Differences between /include/linux/auxiliary_bus.h (Version linux-6.12-rc7) and /include/linux/auxiliary_bus.h (Version linux-5.15.171)

TOMOYO Linux Cross Reference
Linux/include/linux/auxiliary_bus.h