Commit | Line | Data |
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aa613de6 DB |
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> |
4e36dd33 | 20 | #include <linux/module.h> |
aa613de6 | 21 | |
f77289ac | 22 | int mfd_cell_enable(struct platform_device *pdev) |
1e29af62 AS |
23 | { |
24 | const struct mfd_cell *cell = mfd_get_cell(pdev); | |
25 | int err = 0; | |
26 | ||
27 | /* only call enable hook if the cell wasn't previously enabled */ | |
28 | if (atomic_inc_return(cell->usage_count) == 1) | |
29 | err = cell->enable(pdev); | |
30 | ||
31 | /* if the enable hook failed, decrement counter to allow retries */ | |
32 | if (err) | |
33 | atomic_dec(cell->usage_count); | |
34 | ||
35 | return err; | |
36 | } | |
f77289ac | 37 | EXPORT_SYMBOL(mfd_cell_enable); |
1e29af62 | 38 | |
f77289ac | 39 | int mfd_cell_disable(struct platform_device *pdev) |
1e29af62 AS |
40 | { |
41 | const struct mfd_cell *cell = mfd_get_cell(pdev); | |
42 | int err = 0; | |
43 | ||
44 | /* only disable if no other clients are using it */ | |
45 | if (atomic_dec_return(cell->usage_count) == 0) | |
46 | err = cell->disable(pdev); | |
47 | ||
48 | /* if the disable hook failed, increment to allow retries */ | |
49 | if (err) | |
50 | atomic_inc(cell->usage_count); | |
51 | ||
52 | /* sanity check; did someone call disable too many times? */ | |
53 | WARN_ON(atomic_read(cell->usage_count) < 0); | |
54 | ||
55 | return err; | |
56 | } | |
f77289ac | 57 | EXPORT_SYMBOL(mfd_cell_disable); |
1e29af62 | 58 | |
e710d7d5 SO |
59 | static int mfd_platform_add_cell(struct platform_device *pdev, |
60 | const struct mfd_cell *cell) | |
61 | { | |
62 | if (!cell) | |
63 | return 0; | |
64 | ||
65 | pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL); | |
66 | if (!pdev->mfd_cell) | |
67 | return -ENOMEM; | |
68 | ||
69 | return 0; | |
70 | } | |
71 | ||
424f525a | 72 | static int mfd_add_device(struct device *parent, int id, |
7f71ac93 BD |
73 | const struct mfd_cell *cell, |
74 | struct resource *mem_base, | |
75 | int irq_base) | |
aa613de6 | 76 | { |
a87903f3 | 77 | struct resource *res; |
aa613de6 DB |
78 | struct platform_device *pdev; |
79 | int ret = -ENOMEM; | |
80 | int r; | |
81 | ||
3bed6e41 | 82 | pdev = platform_device_alloc(cell->name, id + cell->id); |
aa613de6 DB |
83 | if (!pdev) |
84 | goto fail_alloc; | |
85 | ||
a87903f3 IM |
86 | res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL); |
87 | if (!res) | |
88 | goto fail_device; | |
89 | ||
424f525a | 90 | pdev->dev.parent = parent; |
aa613de6 | 91 | |
eb895607 SO |
92 | if (cell->pdata_size) { |
93 | ret = platform_device_add_data(pdev, | |
94 | cell->platform_data, cell->pdata_size); | |
95 | if (ret) | |
96 | goto fail_res; | |
97 | } | |
98 | ||
e710d7d5 | 99 | ret = mfd_platform_add_cell(pdev, cell); |
fe891a00 AS |
100 | if (ret) |
101 | goto fail_res; | |
aa613de6 | 102 | |
aa613de6 DB |
103 | for (r = 0; r < cell->num_resources; r++) { |
104 | res[r].name = cell->resources[r].name; | |
105 | res[r].flags = cell->resources[r].flags; | |
106 | ||
107 | /* Find out base to use */ | |
f03cfcbc | 108 | if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) { |
aa613de6 DB |
109 | res[r].parent = mem_base; |
110 | res[r].start = mem_base->start + | |
111 | cell->resources[r].start; | |
112 | res[r].end = mem_base->start + | |
113 | cell->resources[r].end; | |
114 | } else if (cell->resources[r].flags & IORESOURCE_IRQ) { | |
115 | res[r].start = irq_base + | |
116 | cell->resources[r].start; | |
117 | res[r].end = irq_base + | |
118 | cell->resources[r].end; | |
119 | } else { | |
120 | res[r].parent = cell->resources[r].parent; | |
121 | res[r].start = cell->resources[r].start; | |
122 | res[r].end = cell->resources[r].end; | |
123 | } | |
91fedede | 124 | |
5f2545fa | 125 | if (!cell->ignore_resource_conflicts) { |
855cc454 | 126 | ret = acpi_check_resource_conflict(&res[r]); |
5f2545fa DD |
127 | if (ret) |
128 | goto fail_res; | |
129 | } | |
aa613de6 DB |
130 | } |
131 | ||
8af5fe3b AL |
132 | ret = platform_device_add_resources(pdev, res, cell->num_resources); |
133 | if (ret) | |
134 | goto fail_res; | |
aa613de6 DB |
135 | |
136 | ret = platform_device_add(pdev); | |
137 | if (ret) | |
a87903f3 IM |
138 | goto fail_res; |
139 | ||
4c90aa94 MB |
140 | if (cell->pm_runtime_no_callbacks) |
141 | pm_runtime_no_callbacks(&pdev->dev); | |
142 | ||
a87903f3 | 143 | kfree(res); |
aa613de6 DB |
144 | |
145 | return 0; | |
146 | ||
a87903f3 IM |
147 | fail_res: |
148 | kfree(res); | |
aa613de6 DB |
149 | fail_device: |
150 | platform_device_put(pdev); | |
151 | fail_alloc: | |
152 | return ret; | |
153 | } | |
154 | ||
424f525a | 155 | int mfd_add_devices(struct device *parent, int id, |
1e29af62 | 156 | struct mfd_cell *cells, int n_devs, |
7f71ac93 BD |
157 | struct resource *mem_base, |
158 | int irq_base) | |
aa613de6 DB |
159 | { |
160 | int i; | |
161 | int ret = 0; | |
1e29af62 AS |
162 | atomic_t *cnts; |
163 | ||
164 | /* initialize reference counting for all cells */ | |
d1b5c5e2 | 165 | cnts = kcalloc(n_devs, sizeof(*cnts), GFP_KERNEL); |
1e29af62 AS |
166 | if (!cnts) |
167 | return -ENOMEM; | |
aa613de6 DB |
168 | |
169 | for (i = 0; i < n_devs; i++) { | |
1e29af62 AS |
170 | atomic_set(&cnts[i], 0); |
171 | cells[i].usage_count = &cnts[i]; | |
424f525a | 172 | ret = mfd_add_device(parent, id, cells + i, mem_base, irq_base); |
aa613de6 DB |
173 | if (ret) |
174 | break; | |
175 | } | |
176 | ||
177 | if (ret) | |
178 | mfd_remove_devices(parent); | |
179 | ||
180 | return ret; | |
181 | } | |
182 | EXPORT_SYMBOL(mfd_add_devices); | |
183 | ||
1e29af62 | 184 | static int mfd_remove_devices_fn(struct device *dev, void *c) |
aa613de6 | 185 | { |
1e29af62 AS |
186 | struct platform_device *pdev = to_platform_device(dev); |
187 | const struct mfd_cell *cell = mfd_get_cell(pdev); | |
188 | atomic_t **usage_count = c; | |
189 | ||
190 | /* find the base address of usage_count pointers (for freeing) */ | |
191 | if (!*usage_count || (cell->usage_count < *usage_count)) | |
192 | *usage_count = cell->usage_count; | |
193 | ||
194 | platform_device_unregister(pdev); | |
aa613de6 DB |
195 | return 0; |
196 | } | |
197 | ||
424f525a | 198 | void mfd_remove_devices(struct device *parent) |
aa613de6 | 199 | { |
1e29af62 AS |
200 | atomic_t *cnts = NULL; |
201 | ||
202 | device_for_each_child(parent, &cnts, mfd_remove_devices_fn); | |
203 | kfree(cnts); | |
aa613de6 DB |
204 | } |
205 | EXPORT_SYMBOL(mfd_remove_devices); | |
206 | ||
fa1df691 | 207 | int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones) |
a9bbba99 AS |
208 | { |
209 | struct mfd_cell cell_entry; | |
210 | struct device *dev; | |
211 | struct platform_device *pdev; | |
fa1df691 | 212 | int i; |
a9bbba99 AS |
213 | |
214 | /* fetch the parent cell's device (should already be registered!) */ | |
215 | dev = bus_find_device_by_name(&platform_bus_type, NULL, cell); | |
216 | if (!dev) { | |
217 | printk(KERN_ERR "failed to find device for cell %s\n", cell); | |
218 | return -ENODEV; | |
219 | } | |
220 | pdev = to_platform_device(dev); | |
221 | memcpy(&cell_entry, mfd_get_cell(pdev), sizeof(cell_entry)); | |
222 | ||
223 | WARN_ON(!cell_entry.enable); | |
224 | ||
fa1df691 AS |
225 | for (i = 0; i < n_clones; i++) { |
226 | cell_entry.name = clones[i]; | |
227 | /* don't give up if a single call fails; just report error */ | |
228 | if (mfd_add_device(pdev->dev.parent, -1, &cell_entry, NULL, 0)) | |
229 | dev_err(dev, "failed to create platform device '%s'\n", | |
230 | clones[i]); | |
231 | } | |
a9bbba99 | 232 | |
fa1df691 | 233 | return 0; |
a9bbba99 | 234 | } |
fa1df691 | 235 | EXPORT_SYMBOL(mfd_clone_cell); |
a9bbba99 | 236 | |
aa613de6 DB |
237 | MODULE_LICENSE("GPL"); |
238 | MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov"); |