2 * platform.c - platform 'pseudo' bus for legacy devices
4 * Copyright (c) 2002-3 Patrick Mochel
5 * Copyright (c) 2002-3 Open Source Development Labs
7 * This file is released under the GPLv2
9 * Please see Documentation/driver-model/platform.txt for more
13 #include <linux/platform_device.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/dma-mapping.h>
17 #include <linux/bootmem.h>
18 #include <linux/err.h>
19 #include <linux/slab.h>
23 struct device platform_bus
= {
28 * platform_get_resource - get a resource for a device
29 * @dev: platform device
30 * @type: resource type
31 * @num: resource index
34 platform_get_resource(struct platform_device
*dev
, unsigned int type
,
39 for (i
= 0; i
< dev
->num_resources
; i
++) {
40 struct resource
*r
= &dev
->resource
[i
];
42 if ((r
->flags
& (IORESOURCE_IO
|IORESOURCE_MEM
|
43 IORESOURCE_IRQ
|IORESOURCE_DMA
))
52 * platform_get_irq - get an IRQ for a device
53 * @dev: platform device
54 * @num: IRQ number index
56 int platform_get_irq(struct platform_device
*dev
, unsigned int num
)
58 struct resource
*r
= platform_get_resource(dev
, IORESOURCE_IRQ
, num
);
60 return r
? r
->start
: 0;
64 * platform_get_resource_byname - get a resource for a device by name
65 * @dev: platform device
66 * @type: resource type
67 * @name: resource name
70 platform_get_resource_byname(struct platform_device
*dev
, unsigned int type
,
75 for (i
= 0; i
< dev
->num_resources
; i
++) {
76 struct resource
*r
= &dev
->resource
[i
];
78 if ((r
->flags
& (IORESOURCE_IO
|IORESOURCE_MEM
|
79 IORESOURCE_IRQ
|IORESOURCE_DMA
)) == type
)
80 if (!strcmp(r
->name
, name
))
87 * platform_get_irq - get an IRQ for a device
88 * @dev: platform device
91 int platform_get_irq_byname(struct platform_device
*dev
, char *name
)
93 struct resource
*r
= platform_get_resource_byname(dev
, IORESOURCE_IRQ
, name
);
95 return r
? r
->start
: 0;
99 * platform_add_devices - add a numbers of platform devices
100 * @devs: array of platform devices to add
101 * @num: number of platform devices in array
103 int platform_add_devices(struct platform_device
**devs
, int num
)
107 for (i
= 0; i
< num
; i
++) {
108 ret
= platform_device_register(devs
[i
]);
111 platform_device_unregister(devs
[i
]);
119 struct platform_object
{
120 struct platform_device pdev
;
125 * platform_device_put
126 * @pdev: platform device to free
128 * Free all memory associated with a platform device. This function
129 * must _only_ be externally called in error cases. All other usage
132 void platform_device_put(struct platform_device
*pdev
)
135 put_device(&pdev
->dev
);
137 EXPORT_SYMBOL_GPL(platform_device_put
);
139 static void platform_device_release(struct device
*dev
)
141 struct platform_object
*pa
= container_of(dev
, struct platform_object
, pdev
.dev
);
143 kfree(pa
->pdev
.dev
.platform_data
);
144 kfree(pa
->pdev
.resource
);
149 * platform_device_alloc
150 * @name: base name of the device we're adding
153 * Create a platform device object which can have other objects attached
154 * to it, and which will have attached objects freed when it is released.
156 struct platform_device
*platform_device_alloc(const char *name
, unsigned int id
)
158 struct platform_object
*pa
;
160 pa
= kzalloc(sizeof(struct platform_object
) + strlen(name
), GFP_KERNEL
);
162 strcpy(pa
->name
, name
);
163 pa
->pdev
.name
= pa
->name
;
165 device_initialize(&pa
->pdev
.dev
);
166 pa
->pdev
.dev
.release
= platform_device_release
;
169 return pa
? &pa
->pdev
: NULL
;
171 EXPORT_SYMBOL_GPL(platform_device_alloc
);
174 * platform_device_add_resources
175 * @pdev: platform device allocated by platform_device_alloc to add resources to
176 * @res: set of resources that needs to be allocated for the device
177 * @num: number of resources
179 * Add a copy of the resources to the platform device. The memory
180 * associated with the resources will be freed when the platform
181 * device is released.
183 int platform_device_add_resources(struct platform_device
*pdev
, struct resource
*res
, unsigned int num
)
187 r
= kmalloc(sizeof(struct resource
) * num
, GFP_KERNEL
);
189 memcpy(r
, res
, sizeof(struct resource
) * num
);
191 pdev
->num_resources
= num
;
193 return r
? 0 : -ENOMEM
;
195 EXPORT_SYMBOL_GPL(platform_device_add_resources
);
198 * platform_device_add_data
199 * @pdev: platform device allocated by platform_device_alloc to add resources to
200 * @data: platform specific data for this platform device
201 * @size: size of platform specific data
203 * Add a copy of platform specific data to the platform device's platform_data
204 * pointer. The memory associated with the platform data will be freed
205 * when the platform device is released.
207 int platform_device_add_data(struct platform_device
*pdev
, void *data
, size_t size
)
211 d
= kmalloc(size
, GFP_KERNEL
);
213 memcpy(d
, data
, size
);
214 pdev
->dev
.platform_data
= d
;
216 return d
? 0 : -ENOMEM
;
218 EXPORT_SYMBOL_GPL(platform_device_add_data
);
221 * platform_device_add - add a platform device to device hierarchy
222 * @pdev: platform device we're adding
224 * This is part 2 of platform_device_register(), though may be called
225 * separately _iff_ pdev was allocated by platform_device_alloc().
227 int platform_device_add(struct platform_device
*pdev
)
234 if (!pdev
->dev
.parent
)
235 pdev
->dev
.parent
= &platform_bus
;
237 pdev
->dev
.bus
= &platform_bus_type
;
240 snprintf(pdev
->dev
.bus_id
, BUS_ID_SIZE
, "%s.%u", pdev
->name
, pdev
->id
);
242 strlcpy(pdev
->dev
.bus_id
, pdev
->name
, BUS_ID_SIZE
);
244 for (i
= 0; i
< pdev
->num_resources
; i
++) {
245 struct resource
*p
, *r
= &pdev
->resource
[i
];
248 r
->name
= pdev
->dev
.bus_id
;
252 if (r
->flags
& IORESOURCE_MEM
)
254 else if (r
->flags
& IORESOURCE_IO
)
255 p
= &ioport_resource
;
258 if (p
&& request_resource(p
, r
)) {
260 "%s: failed to claim resource %d\n",
261 pdev
->dev
.bus_id
, i
);
267 pr_debug("Registering platform device '%s'. Parent at %s\n",
268 pdev
->dev
.bus_id
, pdev
->dev
.parent
->bus_id
);
270 ret
= device_register(&pdev
->dev
);
276 if (pdev
->resource
[i
].flags
& (IORESOURCE_MEM
|IORESOURCE_IO
))
277 release_resource(&pdev
->resource
[i
]);
280 EXPORT_SYMBOL_GPL(platform_device_add
);
283 * platform_device_register - add a platform-level device
284 * @pdev: platform device we're adding
287 int platform_device_register(struct platform_device
* pdev
)
289 device_initialize(&pdev
->dev
);
290 return platform_device_add(pdev
);
294 * platform_device_unregister - remove a platform-level device
295 * @pdev: platform device we're removing
297 * Note that this function will also release all memory- and port-based
298 * resources owned by the device (@dev->resource).
300 void platform_device_unregister(struct platform_device
* pdev
)
305 for (i
= 0; i
< pdev
->num_resources
; i
++) {
306 struct resource
*r
= &pdev
->resource
[i
];
307 if (r
->flags
& (IORESOURCE_MEM
|IORESOURCE_IO
))
311 device_unregister(&pdev
->dev
);
316 * platform_device_register_simple
317 * @name: base name of the device we're adding
319 * @res: set of resources that needs to be allocated for the device
320 * @num: number of resources
322 * This function creates a simple platform device that requires minimal
323 * resource and memory management. Canned release function freeing
324 * memory allocated for the device allows drivers using such devices
325 * to be unloaded iwithout waiting for the last reference to the device
328 struct platform_device
*platform_device_register_simple(char *name
, unsigned int id
,
329 struct resource
*res
, unsigned int num
)
331 struct platform_device
*pdev
;
334 pdev
= platform_device_alloc(name
, id
);
341 retval
= platform_device_add_resources(pdev
, res
, num
);
346 retval
= platform_device_add(pdev
);
353 platform_device_put(pdev
);
354 return ERR_PTR(retval
);
359 * platform_match - bind platform device to platform driver.
363 * Platform device IDs are assumed to be encoded like this:
364 * "<name><instance>", where <name> is a short description of the
365 * type of device, like "pci" or "floppy", and <instance> is the
366 * enumerated instance of the device, like '0' or '42'.
367 * Driver IDs are simply "<name>".
368 * So, extract the <name> from the platform_device structure,
369 * and compare it against the name of the driver. Return whether
373 static int platform_match(struct device
* dev
, struct device_driver
* drv
)
375 struct platform_device
*pdev
= container_of(dev
, struct platform_device
, dev
);
377 return (strncmp(pdev
->name
, drv
->name
, BUS_ID_SIZE
) == 0);
380 static int platform_suspend(struct device
* dev
, pm_message_t state
)
384 if (dev
->driver
&& dev
->driver
->suspend
)
385 ret
= dev
->driver
->suspend(dev
, state
);
390 static int platform_resume(struct device
* dev
)
394 if (dev
->driver
&& dev
->driver
->resume
)
395 ret
= dev
->driver
->resume(dev
);
400 struct bus_type platform_bus_type
= {
402 .match
= platform_match
,
403 .suspend
= platform_suspend
,
404 .resume
= platform_resume
,
407 int __init
platform_bus_init(void)
409 device_register(&platform_bus
);
410 return bus_register(&platform_bus_type
);
413 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
414 u64
dma_get_required_mask(struct device
*dev
)
416 u32 low_totalram
= ((max_pfn
- 1) << PAGE_SHIFT
);
417 u32 high_totalram
= ((max_pfn
- 1) >> (32 - PAGE_SHIFT
));
420 if (!high_totalram
) {
421 /* convert to mask just covering totalram */
422 low_totalram
= (1 << (fls(low_totalram
) - 1));
423 low_totalram
+= low_totalram
- 1;
426 high_totalram
= (1 << (fls(high_totalram
) - 1));
427 high_totalram
+= high_totalram
- 1;
428 mask
= (((u64
)high_totalram
) << 32) + 0xffffffff;
430 return mask
& *dev
->dma_mask
;
432 EXPORT_SYMBOL_GPL(dma_get_required_mask
);
435 EXPORT_SYMBOL_GPL(platform_bus
);
436 EXPORT_SYMBOL_GPL(platform_bus_type
);
437 EXPORT_SYMBOL_GPL(platform_add_devices
);
438 EXPORT_SYMBOL_GPL(platform_device_register
);
439 EXPORT_SYMBOL_GPL(platform_device_register_simple
);
440 EXPORT_SYMBOL_GPL(platform_device_unregister
);
441 EXPORT_SYMBOL_GPL(platform_get_irq
);
442 EXPORT_SYMBOL_GPL(platform_get_resource
);
443 EXPORT_SYMBOL_GPL(platform_get_irq_byname
);
444 EXPORT_SYMBOL_GPL(platform_get_resource_byname
);