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>
24 int mfd_cell_enable(struct platform_device
*pdev
)
26 const struct mfd_cell
*cell
= mfd_get_cell(pdev
);
29 /* only call enable hook if the cell wasn't previously enabled */
30 if (atomic_inc_return(cell
->usage_count
) == 1)
31 err
= cell
->enable(pdev
);
33 /* if the enable hook failed, decrement counter to allow retries */
35 atomic_dec(cell
->usage_count
);
39 EXPORT_SYMBOL(mfd_cell_enable
);
41 int mfd_cell_disable(struct platform_device
*pdev
)
43 const struct mfd_cell
*cell
= mfd_get_cell(pdev
);
46 /* only disable if no other clients are using it */
47 if (atomic_dec_return(cell
->usage_count
) == 0)
48 err
= cell
->disable(pdev
);
50 /* if the disable hook failed, increment to allow retries */
52 atomic_inc(cell
->usage_count
);
54 /* sanity check; did someone call disable too many times? */
55 WARN_ON(atomic_read(cell
->usage_count
) < 0);
59 EXPORT_SYMBOL(mfd_cell_disable
);
61 static int mfd_platform_add_cell(struct platform_device
*pdev
,
62 const struct mfd_cell
*cell
)
67 pdev
->mfd_cell
= kmemdup(cell
, sizeof(*cell
), GFP_KERNEL
);
74 static int mfd_add_device(struct device
*parent
, int id
,
75 const struct mfd_cell
*cell
,
76 struct resource
*mem_base
,
77 int irq_base
, struct irq_domain
*domain
)
80 struct platform_device
*pdev
;
81 struct device_node
*np
= NULL
;
85 pdev
= platform_device_alloc(cell
->name
, id
+ cell
->id
);
89 res
= kzalloc(sizeof(*res
) * cell
->num_resources
, GFP_KERNEL
);
93 pdev
->dev
.parent
= parent
;
95 if (parent
->of_node
&& cell
->of_compatible
) {
96 for_each_child_of_node(parent
->of_node
, np
) {
97 if (of_device_is_compatible(np
, cell
->of_compatible
)) {
98 pdev
->dev
.of_node
= np
;
104 if (cell
->pdata_size
) {
105 ret
= platform_device_add_data(pdev
,
106 cell
->platform_data
, cell
->pdata_size
);
111 ret
= mfd_platform_add_cell(pdev
, cell
);
115 for (r
= 0; r
< cell
->num_resources
; r
++) {
116 res
[r
].name
= cell
->resources
[r
].name
;
117 res
[r
].flags
= cell
->resources
[r
].flags
;
119 /* Find out base to use */
120 if ((cell
->resources
[r
].flags
& IORESOURCE_MEM
) && mem_base
) {
121 res
[r
].parent
= mem_base
;
122 res
[r
].start
= mem_base
->start
+
123 cell
->resources
[r
].start
;
124 res
[r
].end
= mem_base
->start
+
125 cell
->resources
[r
].end
;
126 } else if (cell
->resources
[r
].flags
& IORESOURCE_IRQ
) {
128 /* Unable to create mappings for IRQ ranges. */
129 WARN_ON(cell
->resources
[r
].start
!=
130 cell
->resources
[r
].end
);
131 res
[r
].start
= res
[r
].end
= irq_create_mapping(
132 domain
, cell
->resources
[r
].start
);
134 res
[r
].start
= irq_base
+
135 cell
->resources
[r
].start
;
136 res
[r
].end
= irq_base
+
137 cell
->resources
[r
].end
;
140 res
[r
].parent
= cell
->resources
[r
].parent
;
141 res
[r
].start
= cell
->resources
[r
].start
;
142 res
[r
].end
= cell
->resources
[r
].end
;
145 if (!cell
->ignore_resource_conflicts
) {
146 ret
= acpi_check_resource_conflict(&res
[r
]);
152 ret
= platform_device_add_resources(pdev
, res
, cell
->num_resources
);
156 ret
= platform_device_add(pdev
);
160 if (cell
->pm_runtime_no_callbacks
)
161 pm_runtime_no_callbacks(&pdev
->dev
);
170 platform_device_put(pdev
);
175 int mfd_add_devices(struct device
*parent
, int id
,
176 struct mfd_cell
*cells
, int n_devs
,
177 struct resource
*mem_base
,
178 int irq_base
, struct irq_domain
*domain
)
184 /* initialize reference counting for all cells */
185 cnts
= kcalloc(n_devs
, sizeof(*cnts
), GFP_KERNEL
);
189 for (i
= 0; i
< n_devs
; i
++) {
190 atomic_set(&cnts
[i
], 0);
191 cells
[i
].usage_count
= &cnts
[i
];
192 ret
= mfd_add_device(parent
, id
, cells
+ i
, mem_base
,
199 mfd_remove_devices(parent
);
203 EXPORT_SYMBOL(mfd_add_devices
);
205 static int mfd_remove_devices_fn(struct device
*dev
, void *c
)
207 struct platform_device
*pdev
= to_platform_device(dev
);
208 const struct mfd_cell
*cell
= mfd_get_cell(pdev
);
209 atomic_t
**usage_count
= c
;
211 /* find the base address of usage_count pointers (for freeing) */
212 if (!*usage_count
|| (cell
->usage_count
< *usage_count
))
213 *usage_count
= cell
->usage_count
;
215 platform_device_unregister(pdev
);
219 void mfd_remove_devices(struct device
*parent
)
221 atomic_t
*cnts
= NULL
;
223 device_for_each_child(parent
, &cnts
, mfd_remove_devices_fn
);
226 EXPORT_SYMBOL(mfd_remove_devices
);
228 int mfd_clone_cell(const char *cell
, const char **clones
, size_t n_clones
)
230 struct mfd_cell cell_entry
;
232 struct platform_device
*pdev
;
235 /* fetch the parent cell's device (should already be registered!) */
236 dev
= bus_find_device_by_name(&platform_bus_type
, NULL
, cell
);
238 printk(KERN_ERR
"failed to find device for cell %s\n", cell
);
241 pdev
= to_platform_device(dev
);
242 memcpy(&cell_entry
, mfd_get_cell(pdev
), sizeof(cell_entry
));
244 WARN_ON(!cell_entry
.enable
);
246 for (i
= 0; i
< n_clones
; i
++) {
247 cell_entry
.name
= clones
[i
];
248 /* don't give up if a single call fails; just report error */
249 if (mfd_add_device(pdev
->dev
.parent
, -1, &cell_entry
, NULL
, 0,
251 dev_err(dev
, "failed to create platform device '%s'\n",
257 EXPORT_SYMBOL(mfd_clone_cell
);
259 MODULE_LICENSE("GPL");
260 MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");