2 * drivers/mfd/mfd-core.c
5 * Copyright (c) 2006 Ian Molton
6 * Copyright (c) 2007,2008 Dmitry Baryshkov
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
14 #include <linux/kernel.h>
15 #include <linux/platform_device.h>
16 #include <linux/acpi.h>
17 #include <linux/mfd/core.h>
18 #include <linux/pm_runtime.h>
19 #include <linux/slab.h>
20 #include <linux/module.h>
21 #include <linux/irqdomain.h>
23 #include <linux/regulator/consumer.h>
25 static struct device_type mfd_dev_type
= {
29 int mfd_cell_enable(struct platform_device
*pdev
)
31 const struct mfd_cell
*cell
= mfd_get_cell(pdev
);
34 /* only call enable hook if the cell wasn't previously enabled */
35 if (atomic_inc_return(cell
->usage_count
) == 1)
36 err
= cell
->enable(pdev
);
38 /* if the enable hook failed, decrement counter to allow retries */
40 atomic_dec(cell
->usage_count
);
44 EXPORT_SYMBOL(mfd_cell_enable
);
46 int mfd_cell_disable(struct platform_device
*pdev
)
48 const struct mfd_cell
*cell
= mfd_get_cell(pdev
);
51 /* only disable if no other clients are using it */
52 if (atomic_dec_return(cell
->usage_count
) == 0)
53 err
= cell
->disable(pdev
);
55 /* if the disable hook failed, increment to allow retries */
57 atomic_inc(cell
->usage_count
);
59 /* sanity check; did someone call disable too many times? */
60 WARN_ON(atomic_read(cell
->usage_count
) < 0);
64 EXPORT_SYMBOL(mfd_cell_disable
);
66 static int mfd_platform_add_cell(struct platform_device
*pdev
,
67 const struct mfd_cell
*cell
,
68 atomic_t
*usage_count
)
73 pdev
->mfd_cell
= kmemdup(cell
, sizeof(*cell
), GFP_KERNEL
);
77 pdev
->mfd_cell
->usage_count
= usage_count
;
81 #if IS_ENABLED(CONFIG_ACPI)
82 static void mfd_acpi_add_device(const struct mfd_cell
*cell
,
83 struct platform_device
*pdev
)
85 struct acpi_device
*parent_adev
;
86 struct acpi_device
*adev
;
88 parent_adev
= ACPI_COMPANION(pdev
->dev
.parent
);
93 * MFD child device gets its ACPI handle either from the ACPI
94 * device directly under the parent that matches the acpi_pnpid or
95 * it will use the parent handle if is no acpi_pnpid is given.
98 if (cell
->acpi_pnpid
) {
99 struct acpi_device_id ids
[2] = {};
100 struct acpi_device
*child_adev
;
102 strlcpy(ids
[0].id
, cell
->acpi_pnpid
, sizeof(ids
[0].id
));
103 list_for_each_entry(child_adev
, &parent_adev
->children
, node
)
104 if (acpi_match_device_ids(child_adev
, ids
)) {
110 ACPI_COMPANION_SET(&pdev
->dev
, adev
);
113 static inline void mfd_acpi_add_device(const struct mfd_cell
*cell
,
114 struct platform_device
*pdev
)
119 static int mfd_add_device(struct device
*parent
, int id
,
120 const struct mfd_cell
*cell
, atomic_t
*usage_count
,
121 struct resource
*mem_base
,
122 int irq_base
, struct irq_domain
*domain
)
124 struct resource
*res
;
125 struct platform_device
*pdev
;
126 struct device_node
*np
= NULL
;
130 pdev
= platform_device_alloc(cell
->name
, id
+ cell
->id
);
134 res
= kzalloc(sizeof(*res
) * cell
->num_resources
, GFP_KERNEL
);
138 pdev
->dev
.parent
= parent
;
139 pdev
->dev
.type
= &mfd_dev_type
;
140 pdev
->dev
.dma_mask
= parent
->dma_mask
;
141 pdev
->dev
.dma_parms
= parent
->dma_parms
;
142 pdev
->dev
.coherent_dma_mask
= parent
->coherent_dma_mask
;
144 ret
= regulator_bulk_register_supply_alias(
145 &pdev
->dev
, cell
->parent_supplies
,
146 parent
, cell
->parent_supplies
,
147 cell
->num_parent_supplies
);
151 if (parent
->of_node
&& cell
->of_compatible
) {
152 for_each_child_of_node(parent
->of_node
, np
) {
153 if (of_device_is_compatible(np
, cell
->of_compatible
)) {
154 pdev
->dev
.of_node
= np
;
160 mfd_acpi_add_device(cell
, pdev
);
162 if (cell
->pdata_size
) {
163 ret
= platform_device_add_data(pdev
,
164 cell
->platform_data
, cell
->pdata_size
);
169 ret
= mfd_platform_add_cell(pdev
, cell
, usage_count
);
173 for (r
= 0; r
< cell
->num_resources
; r
++) {
174 res
[r
].name
= cell
->resources
[r
].name
;
175 res
[r
].flags
= cell
->resources
[r
].flags
;
177 /* Find out base to use */
178 if ((cell
->resources
[r
].flags
& IORESOURCE_MEM
) && mem_base
) {
179 res
[r
].parent
= mem_base
;
180 res
[r
].start
= mem_base
->start
+
181 cell
->resources
[r
].start
;
182 res
[r
].end
= mem_base
->start
+
183 cell
->resources
[r
].end
;
184 } else if (cell
->resources
[r
].flags
& IORESOURCE_IRQ
) {
186 /* Unable to create mappings for IRQ ranges. */
187 WARN_ON(cell
->resources
[r
].start
!=
188 cell
->resources
[r
].end
);
189 res
[r
].start
= res
[r
].end
= irq_create_mapping(
190 domain
, cell
->resources
[r
].start
);
192 res
[r
].start
= irq_base
+
193 cell
->resources
[r
].start
;
194 res
[r
].end
= irq_base
+
195 cell
->resources
[r
].end
;
198 res
[r
].parent
= cell
->resources
[r
].parent
;
199 res
[r
].start
= cell
->resources
[r
].start
;
200 res
[r
].end
= cell
->resources
[r
].end
;
203 if (!cell
->ignore_resource_conflicts
) {
204 ret
= acpi_check_resource_conflict(&res
[r
]);
210 ret
= platform_device_add_resources(pdev
, res
, cell
->num_resources
);
214 ret
= platform_device_add(pdev
);
218 if (cell
->pm_runtime_no_callbacks
)
219 pm_runtime_no_callbacks(&pdev
->dev
);
226 regulator_bulk_unregister_supply_alias(&pdev
->dev
,
227 cell
->parent_supplies
,
228 cell
->num_parent_supplies
);
232 platform_device_put(pdev
);
237 int mfd_add_devices(struct device
*parent
, int id
,
238 const struct mfd_cell
*cells
, int n_devs
,
239 struct resource
*mem_base
,
240 int irq_base
, struct irq_domain
*domain
)
246 /* initialize reference counting for all cells */
247 cnts
= kcalloc(n_devs
, sizeof(*cnts
), GFP_KERNEL
);
251 for (i
= 0; i
< n_devs
; i
++) {
252 atomic_set(&cnts
[i
], 0);
253 ret
= mfd_add_device(parent
, id
, cells
+ i
, cnts
+ i
, mem_base
,
263 mfd_remove_devices(parent
);
268 EXPORT_SYMBOL(mfd_add_devices
);
270 static int mfd_remove_devices_fn(struct device
*dev
, void *c
)
272 struct platform_device
*pdev
;
273 const struct mfd_cell
*cell
;
274 atomic_t
**usage_count
= c
;
276 if (dev
->type
!= &mfd_dev_type
)
279 pdev
= to_platform_device(dev
);
280 cell
= mfd_get_cell(pdev
);
282 regulator_bulk_unregister_supply_alias(dev
, cell
->parent_supplies
,
283 cell
->num_parent_supplies
);
285 /* find the base address of usage_count pointers (for freeing) */
286 if (!*usage_count
|| (cell
->usage_count
< *usage_count
))
287 *usage_count
= cell
->usage_count
;
289 platform_device_unregister(pdev
);
293 void mfd_remove_devices(struct device
*parent
)
295 atomic_t
*cnts
= NULL
;
297 device_for_each_child(parent
, &cnts
, mfd_remove_devices_fn
);
300 EXPORT_SYMBOL(mfd_remove_devices
);
302 int mfd_clone_cell(const char *cell
, const char **clones
, size_t n_clones
)
304 struct mfd_cell cell_entry
;
306 struct platform_device
*pdev
;
309 /* fetch the parent cell's device (should already be registered!) */
310 dev
= bus_find_device_by_name(&platform_bus_type
, NULL
, cell
);
312 printk(KERN_ERR
"failed to find device for cell %s\n", cell
);
315 pdev
= to_platform_device(dev
);
316 memcpy(&cell_entry
, mfd_get_cell(pdev
), sizeof(cell_entry
));
318 WARN_ON(!cell_entry
.enable
);
320 for (i
= 0; i
< n_clones
; i
++) {
321 cell_entry
.name
= clones
[i
];
322 /* don't give up if a single call fails; just report error */
323 if (mfd_add_device(pdev
->dev
.parent
, -1, &cell_entry
,
324 cell_entry
.usage_count
, NULL
, 0, NULL
))
325 dev_err(dev
, "failed to create platform device '%s'\n",
331 EXPORT_SYMBOL(mfd_clone_cell
);
333 MODULE_LICENSE("GPL");
334 MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");