1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * platform_device.h - generic, centralized driver model
4 *
5 * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
6 *
7 * See Documentation/driver-api/driver-model/ for more information.
8 */
9
10#ifndef _PLATFORM_DEVICE_H_
11#define _PLATFORM_DEVICE_H_
12
13#include <linux/device.h>
14
15#define PLATFORM_DEVID_NONE (-1)
16#define PLATFORM_DEVID_AUTO (-2)
17
18struct irq_affinity;
19struct mfd_cell;
20struct property_entry;
21struct platform_device_id;
22
23struct platform_device {
24 const char *name;
25 int id;
26 bool id_auto;
27 struct device dev;
28 u64 platform_dma_mask;
29 struct device_dma_parameters dma_parms;
30 u32 num_resources;
31 struct resource *resource;
32
33 const struct platform_device_id *id_entry;
34 /*
35 * Driver name to force a match. Do not set directly, because core
36 * frees it. Use driver_set_override() to set or clear it.
37 */
38 const char *driver_override;
39
40 /* MFD cell pointer */
41 struct mfd_cell *mfd_cell;
42
43 /* arch specific additions */
44 struct pdev_archdata archdata;
45};
46
47#define platform_get_device_id(pdev) ((pdev)->id_entry)
48
49#define dev_is_platform(dev) ((dev)->bus == &platform_bus_type)
50#define to_platform_device(x) container_of((x), struct platform_device, dev)
51
52extern int platform_device_register(struct platform_device *);
53extern void platform_device_unregister(struct platform_device *);
54
55extern const struct bus_type platform_bus_type;
56extern struct device platform_bus;
57
58extern struct resource *platform_get_resource(struct platform_device *,
59 unsigned int, unsigned int);
60extern struct resource *platform_get_mem_or_io(struct platform_device *,
61 unsigned int);
62
63extern struct device *
64platform_find_device_by_driver(struct device *start,
65 const struct device_driver *drv);
66
67#ifdef CONFIG_HAS_IOMEM
68extern void __iomem *
69devm_platform_get_and_ioremap_resource(struct platform_device *pdev,
70 unsigned int index, struct resource **res);
71extern void __iomem *
72devm_platform_ioremap_resource(struct platform_device *pdev,
73 unsigned int index);
74extern void __iomem *
75devm_platform_ioremap_resource_byname(struct platform_device *pdev,
76 const char *name);
77#else
78
79static inline void __iomem *
80devm_platform_get_and_ioremap_resource(struct platform_device *pdev,
81 unsigned int index, struct resource **res)
82{
83 return ERR_PTR(-EINVAL);
84}
85
86
87static inline void __iomem *
88devm_platform_ioremap_resource(struct platform_device *pdev,
89 unsigned int index)
90{
91 return ERR_PTR(-EINVAL);
92}
93
94static inline void __iomem *
95devm_platform_ioremap_resource_byname(struct platform_device *pdev,
96 const char *name)
97{
98 return ERR_PTR(-EINVAL);
99}
100
101#endif
102
103extern int platform_get_irq(struct platform_device *, unsigned int);
104extern int platform_get_irq_optional(struct platform_device *, unsigned int);
105extern int platform_irq_count(struct platform_device *);
106extern int devm_platform_get_irqs_affinity(struct platform_device *dev,
107 struct irq_affinity *affd,
108 unsigned int minvec,
109 unsigned int maxvec,
110 int **irqs);
111extern struct resource *platform_get_resource_byname(struct platform_device *,
112 unsigned int,
113 const char *);
114extern int platform_get_irq_byname(struct platform_device *, const char *);
115extern int platform_get_irq_byname_optional(struct platform_device *dev,
116 const char *name);
117extern int platform_add_devices(struct platform_device **, int);
118
119struct platform_device_info {
120 struct device *parent;
121 struct fwnode_handle *fwnode;
122 bool of_node_reused;
123
124 const char *name;
125 int id;
126
127 const struct resource *res;
128 unsigned int num_res;
129
130 const void *data;
131 size_t size_data;
132 u64 dma_mask;
133
134 const struct property_entry *properties;
135};
136extern struct platform_device *platform_device_register_full(
137 const struct platform_device_info *pdevinfo);
138
139/**
140 * platform_device_register_resndata - add a platform-level device with
141 * resources and platform-specific data
142 *
143 * @parent: parent device for the device we're adding
144 * @name: base name of the device we're adding
145 * @id: instance id
146 * @res: set of resources that needs to be allocated for the device
147 * @num: number of resources
148 * @data: platform specific data for this platform device
149 * @size: size of platform specific data
150 *
151 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
152 */
153static inline struct platform_device *platform_device_register_resndata(
154 struct device *parent, const char *name, int id,
155 const struct resource *res, unsigned int num,
156 const void *data, size_t size) {
157
158 struct platform_device_info pdevinfo = {
159 .parent = parent,
160 .name = name,
161 .id = id,
162 .res = res,
163 .num_res = num,
164 .data = data,
165 .size_data = size,
166 .dma_mask = 0,
167 };
168
169 return platform_device_register_full(pdevinfo: &pdevinfo);
170}
171
172/**
173 * platform_device_register_simple - add a platform-level device and its resources
174 * @name: base name of the device we're adding
175 * @id: instance id
176 * @res: set of resources that needs to be allocated for the device
177 * @num: number of resources
178 *
179 * This function creates a simple platform device that requires minimal
180 * resource and memory management. Canned release function freeing memory
181 * allocated for the device allows drivers using such devices to be
182 * unloaded without waiting for the last reference to the device to be
183 * dropped.
184 *
185 * This interface is primarily intended for use with legacy drivers which
186 * probe hardware directly. Because such drivers create sysfs device nodes
187 * themselves, rather than letting system infrastructure handle such device
188 * enumeration tasks, they don't fully conform to the Linux driver model.
189 * In particular, when such drivers are built as modules, they can't be
190 * "hotplugged".
191 *
192 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
193 */
194static inline struct platform_device *platform_device_register_simple(
195 const char *name, int id,
196 const struct resource *res, unsigned int num)
197{
198 return platform_device_register_resndata(NULL, name, id,
199 res, num, NULL, size: 0);
200}
201
202/**
203 * platform_device_register_data - add a platform-level device with platform-specific data
204 * @parent: parent device for the device we're adding
205 * @name: base name of the device we're adding
206 * @id: instance id
207 * @data: platform specific data for this platform device
208 * @size: size of platform specific data
209 *
210 * This function creates a simple platform device that requires minimal
211 * resource and memory management. Canned release function freeing memory
212 * allocated for the device allows drivers using such devices to be
213 * unloaded without waiting for the last reference to the device to be
214 * dropped.
215 *
216 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
217 */
218static inline struct platform_device *platform_device_register_data(
219 struct device *parent, const char *name, int id,
220 const void *data, size_t size)
221{
222 return platform_device_register_resndata(parent, name, id,
223 NULL, num: 0, data, size);
224}
225
226extern struct platform_device *platform_device_alloc(const char *name, int id);
227extern int platform_device_add_resources(struct platform_device *pdev,
228 const struct resource *res,
229 unsigned int num);
230extern int platform_device_add_data(struct platform_device *pdev,
231 const void *data, size_t size);
232extern int platform_device_add(struct platform_device *pdev);
233extern void platform_device_del(struct platform_device *pdev);
234extern void platform_device_put(struct platform_device *pdev);
235
236struct platform_driver {
237 int (*probe)(struct platform_device *);
238 void (*remove)(struct platform_device *);
239 void (*shutdown)(struct platform_device *);
240 int (*suspend)(struct platform_device *, pm_message_t state);
241 int (*resume)(struct platform_device *);
242 struct device_driver driver;
243 const struct platform_device_id *id_table;
244 bool prevent_deferred_probe;
245 /*
246 * For most device drivers, no need to care about this flag as long as
247 * all DMAs are handled through the kernel DMA API. For some special
248 * ones, for example VFIO drivers, they know how to manage the DMA
249 * themselves and set this flag so that the IOMMU layer will allow them
250 * to setup and manage their own I/O address space.
251 */
252 bool driver_managed_dma;
253};
254
255#define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
256 driver))
257
258/*
259 * use a macro to avoid include chaining to get THIS_MODULE
260 */
261#define platform_driver_register(drv) \
262 __platform_driver_register(drv, THIS_MODULE)
263extern int __platform_driver_register(struct platform_driver *,
264 struct module *);
265extern void platform_driver_unregister(struct platform_driver *);
266
267/* non-hotpluggable platform devices may use this so that probe() and
268 * its support may live in __init sections, conserving runtime memory.
269 */
270#define platform_driver_probe(drv, probe) \
271 __platform_driver_probe(drv, probe, THIS_MODULE)
272extern int __platform_driver_probe(struct platform_driver *driver,
273 int (*probe)(struct platform_device *), struct module *module);
274
275static inline void *platform_get_drvdata(const struct platform_device *pdev)
276{
277 return dev_get_drvdata(dev: &pdev->dev);
278}
279
280static inline void platform_set_drvdata(struct platform_device *pdev,
281 void *data)
282{
283 dev_set_drvdata(dev: &pdev->dev, data);
284}
285
286/* module_platform_driver() - Helper macro for drivers that don't do
287 * anything special in module init/exit. This eliminates a lot of
288 * boilerplate. Each module may only use this macro once, and
289 * calling it replaces module_init() and module_exit()
290 */
291#define module_platform_driver(__platform_driver) \
292 module_driver(__platform_driver, platform_driver_register, \
293 platform_driver_unregister)
294
295/* builtin_platform_driver() - Helper macro for builtin drivers that
296 * don't do anything special in driver init. This eliminates some
297 * boilerplate. Each driver may only use this macro once, and
298 * calling it replaces device_initcall(). Note this is meant to be
299 * a parallel of module_platform_driver() above, but w/o _exit stuff.
300 */
301#define builtin_platform_driver(__platform_driver) \
302 builtin_driver(__platform_driver, platform_driver_register)
303
304/* module_platform_driver_probe() - Helper macro for drivers that don't do
305 * anything special in module init/exit. This eliminates a lot of
306 * boilerplate. Each module may only use this macro once, and
307 * calling it replaces module_init() and module_exit()
308 */
309#define module_platform_driver_probe(__platform_driver, __platform_probe) \
310static int __init __platform_driver##_init(void) \
311{ \
312 return platform_driver_probe(&(__platform_driver), \
313 __platform_probe); \
314} \
315module_init(__platform_driver##_init); \
316static void __exit __platform_driver##_exit(void) \
317{ \
318 platform_driver_unregister(&(__platform_driver)); \
319} \
320module_exit(__platform_driver##_exit);
321
322/* builtin_platform_driver_probe() - Helper macro for drivers that don't do
323 * anything special in device init. This eliminates some boilerplate. Each
324 * driver may only use this macro once, and using it replaces device_initcall.
325 * This is meant to be a parallel of module_platform_driver_probe above, but
326 * without the __exit parts.
327 */
328#define builtin_platform_driver_probe(__platform_driver, __platform_probe) \
329static int __init __platform_driver##_init(void) \
330{ \
331 return platform_driver_probe(&(__platform_driver), \
332 __platform_probe); \
333} \
334device_initcall(__platform_driver##_init); \
335
336#define platform_create_bundle(driver, probe, res, n_res, data, size) \
337 __platform_create_bundle(driver, probe, res, n_res, data, size, THIS_MODULE)
338extern struct platform_device *__platform_create_bundle(
339 struct platform_driver *driver, int (*probe)(struct platform_device *),
340 struct resource *res, unsigned int n_res,
341 const void *data, size_t size, struct module *module);
342
343int __platform_register_drivers(struct platform_driver * const *drivers,
344 unsigned int count, struct module *owner);
345void platform_unregister_drivers(struct platform_driver * const *drivers,
346 unsigned int count);
347
348#define platform_register_drivers(drivers, count) \
349 __platform_register_drivers(drivers, count, THIS_MODULE)
350
351#ifdef CONFIG_SUSPEND
352extern int platform_pm_suspend(struct device *dev);
353extern int platform_pm_resume(struct device *dev);
354#else
355#define platform_pm_suspend NULL
356#define platform_pm_resume NULL
357#endif
358
359#ifdef CONFIG_HIBERNATE_CALLBACKS
360extern int platform_pm_freeze(struct device *dev);
361extern int platform_pm_thaw(struct device *dev);
362extern int platform_pm_poweroff(struct device *dev);
363extern int platform_pm_restore(struct device *dev);
364#else
365#define platform_pm_freeze NULL
366#define platform_pm_thaw NULL
367#define platform_pm_poweroff NULL
368#define platform_pm_restore NULL
369#endif
370
371#ifdef CONFIG_PM_SLEEP
372#define USE_PLATFORM_PM_SLEEP_OPS \
373 .suspend = platform_pm_suspend, \
374 .resume = platform_pm_resume, \
375 .freeze = platform_pm_freeze, \
376 .thaw = platform_pm_thaw, \
377 .poweroff = platform_pm_poweroff, \
378 .restore = platform_pm_restore,
379#else
380#define USE_PLATFORM_PM_SLEEP_OPS
381#endif
382
383#ifndef CONFIG_SUPERH
384/*
385 * REVISIT: This stub is needed for all non-SuperH users of early platform
386 * drivers. It should go away once we introduce the new platform_device-based
387 * early driver framework.
388 */
389static inline int is_sh_early_platform_device(struct platform_device *pdev)
390{
391 return 0;
392}
393#endif /* CONFIG_SUPERH */
394
395/* For now only SuperH uses it */
396void early_platform_cleanup(void);
397
398#endif /* _PLATFORM_DEVICE_H_ */
399

source code of linux/include/linux/platform_device.h