Revert "net: fix section mismatches"
[deliverable/linux.git] / drivers / mfd / mfd-core.c
CommitLineData
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1/*
2 * drivers/mfd/mfd-core.c
3 *
4 * core MFD support
5 * Copyright (c) 2006 Ian Molton
6 * Copyright (c) 2007,2008 Dmitry Baryshkov
7 *
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.
11 *
12 */
13
14#include <linux/kernel.h>
15#include <linux/platform_device.h>
91fedede 16#include <linux/acpi.h>
aa613de6 17#include <linux/mfd/core.h>
4c90aa94 18#include <linux/pm_runtime.h>
5a0e3ad6 19#include <linux/slab.h>
aa613de6 20
f77289ac 21int mfd_cell_enable(struct platform_device *pdev)
1e29af62
AS
22{
23 const struct mfd_cell *cell = mfd_get_cell(pdev);
24 int err = 0;
25
26 /* only call enable hook if the cell wasn't previously enabled */
27 if (atomic_inc_return(cell->usage_count) == 1)
28 err = cell->enable(pdev);
29
30 /* if the enable hook failed, decrement counter to allow retries */
31 if (err)
32 atomic_dec(cell->usage_count);
33
34 return err;
35}
f77289ac 36EXPORT_SYMBOL(mfd_cell_enable);
1e29af62 37
f77289ac 38int mfd_cell_disable(struct platform_device *pdev)
1e29af62
AS
39{
40 const struct mfd_cell *cell = mfd_get_cell(pdev);
41 int err = 0;
42
43 /* only disable if no other clients are using it */
44 if (atomic_dec_return(cell->usage_count) == 0)
45 err = cell->disable(pdev);
46
47 /* if the disable hook failed, increment to allow retries */
48 if (err)
49 atomic_inc(cell->usage_count);
50
51 /* sanity check; did someone call disable too many times? */
52 WARN_ON(atomic_read(cell->usage_count) < 0);
53
54 return err;
55}
f77289ac 56EXPORT_SYMBOL(mfd_cell_disable);
1e29af62 57
e710d7d5
SO
58static int mfd_platform_add_cell(struct platform_device *pdev,
59 const struct mfd_cell *cell)
60{
61 if (!cell)
62 return 0;
63
64 pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL);
65 if (!pdev->mfd_cell)
66 return -ENOMEM;
67
68 return 0;
69}
70
424f525a 71static int mfd_add_device(struct device *parent, int id,
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BD
72 const struct mfd_cell *cell,
73 struct resource *mem_base,
74 int irq_base)
aa613de6 75{
a87903f3 76 struct resource *res;
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77 struct platform_device *pdev;
78 int ret = -ENOMEM;
79 int r;
80
3bed6e41 81 pdev = platform_device_alloc(cell->name, id + cell->id);
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82 if (!pdev)
83 goto fail_alloc;
84
a87903f3
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85 res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL);
86 if (!res)
87 goto fail_device;
88
424f525a 89 pdev->dev.parent = parent;
aa613de6 90
e710d7d5 91 ret = mfd_platform_add_cell(pdev, cell);
fe891a00
AS
92 if (ret)
93 goto fail_res;
aa613de6 94
aa613de6
DB
95 for (r = 0; r < cell->num_resources; r++) {
96 res[r].name = cell->resources[r].name;
97 res[r].flags = cell->resources[r].flags;
98
99 /* Find out base to use */
f03cfcbc 100 if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) {
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DB
101 res[r].parent = mem_base;
102 res[r].start = mem_base->start +
103 cell->resources[r].start;
104 res[r].end = mem_base->start +
105 cell->resources[r].end;
106 } else if (cell->resources[r].flags & IORESOURCE_IRQ) {
107 res[r].start = irq_base +
108 cell->resources[r].start;
109 res[r].end = irq_base +
110 cell->resources[r].end;
111 } else {
112 res[r].parent = cell->resources[r].parent;
113 res[r].start = cell->resources[r].start;
114 res[r].end = cell->resources[r].end;
115 }
91fedede 116
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117 if (!cell->ignore_resource_conflicts) {
118 ret = acpi_check_resource_conflict(res);
119 if (ret)
120 goto fail_res;
121 }
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122 }
123
8af5fe3b
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124 ret = platform_device_add_resources(pdev, res, cell->num_resources);
125 if (ret)
126 goto fail_res;
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127
128 ret = platform_device_add(pdev);
129 if (ret)
a87903f3
IM
130 goto fail_res;
131
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MB
132 if (cell->pm_runtime_no_callbacks)
133 pm_runtime_no_callbacks(&pdev->dev);
134
a87903f3 135 kfree(res);
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136
137 return 0;
138
a87903f3
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139fail_res:
140 kfree(res);
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141fail_device:
142 platform_device_put(pdev);
143fail_alloc:
144 return ret;
145}
146
424f525a 147int mfd_add_devices(struct device *parent, int id,
1e29af62 148 struct mfd_cell *cells, int n_devs,
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BD
149 struct resource *mem_base,
150 int irq_base)
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DB
151{
152 int i;
153 int ret = 0;
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154 atomic_t *cnts;
155
156 /* initialize reference counting for all cells */
157 cnts = kcalloc(sizeof(*cnts), n_devs, GFP_KERNEL);
158 if (!cnts)
159 return -ENOMEM;
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160
161 for (i = 0; i < n_devs; i++) {
1e29af62
AS
162 atomic_set(&cnts[i], 0);
163 cells[i].usage_count = &cnts[i];
424f525a 164 ret = mfd_add_device(parent, id, cells + i, mem_base, irq_base);
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DB
165 if (ret)
166 break;
167 }
168
169 if (ret)
170 mfd_remove_devices(parent);
171
172 return ret;
173}
174EXPORT_SYMBOL(mfd_add_devices);
175
1e29af62 176static int mfd_remove_devices_fn(struct device *dev, void *c)
aa613de6 177{
1e29af62
AS
178 struct platform_device *pdev = to_platform_device(dev);
179 const struct mfd_cell *cell = mfd_get_cell(pdev);
180 atomic_t **usage_count = c;
181
182 /* find the base address of usage_count pointers (for freeing) */
183 if (!*usage_count || (cell->usage_count < *usage_count))
184 *usage_count = cell->usage_count;
185
186 platform_device_unregister(pdev);
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187 return 0;
188}
189
424f525a 190void mfd_remove_devices(struct device *parent)
aa613de6 191{
1e29af62
AS
192 atomic_t *cnts = NULL;
193
194 device_for_each_child(parent, &cnts, mfd_remove_devices_fn);
195 kfree(cnts);
aa613de6
DB
196}
197EXPORT_SYMBOL(mfd_remove_devices);
198
fa1df691 199int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones)
a9bbba99
AS
200{
201 struct mfd_cell cell_entry;
202 struct device *dev;
203 struct platform_device *pdev;
fa1df691 204 int i;
a9bbba99
AS
205
206 /* fetch the parent cell's device (should already be registered!) */
207 dev = bus_find_device_by_name(&platform_bus_type, NULL, cell);
208 if (!dev) {
209 printk(KERN_ERR "failed to find device for cell %s\n", cell);
210 return -ENODEV;
211 }
212 pdev = to_platform_device(dev);
213 memcpy(&cell_entry, mfd_get_cell(pdev), sizeof(cell_entry));
214
215 WARN_ON(!cell_entry.enable);
216
fa1df691
AS
217 for (i = 0; i < n_clones; i++) {
218 cell_entry.name = clones[i];
219 /* don't give up if a single call fails; just report error */
220 if (mfd_add_device(pdev->dev.parent, -1, &cell_entry, NULL, 0))
221 dev_err(dev, "failed to create platform device '%s'\n",
222 clones[i]);
223 }
a9bbba99 224
fa1df691 225 return 0;
a9bbba99 226}
fa1df691 227EXPORT_SYMBOL(mfd_clone_cell);
a9bbba99 228
aa613de6
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229MODULE_LICENSE("GPL");
230MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");
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