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> |
c94bb233 LJ |
21 | #include <linux/irqdomain.h> |
22 | #include <linux/of.h> | |
7fcd4274 | 23 | #include <linux/regulator/consumer.h> |
aa613de6 | 24 | |
b9fbb62e CK |
25 | static struct device_type mfd_dev_type = { |
26 | .name = "mfd_device", | |
27 | }; | |
28 | ||
f77289ac | 29 | int mfd_cell_enable(struct platform_device *pdev) |
1e29af62 AS |
30 | { |
31 | const struct mfd_cell *cell = mfd_get_cell(pdev); | |
32 | int err = 0; | |
33 | ||
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); | |
37 | ||
38 | /* if the enable hook failed, decrement counter to allow retries */ | |
39 | if (err) | |
40 | atomic_dec(cell->usage_count); | |
41 | ||
42 | return err; | |
43 | } | |
f77289ac | 44 | EXPORT_SYMBOL(mfd_cell_enable); |
1e29af62 | 45 | |
f77289ac | 46 | int mfd_cell_disable(struct platform_device *pdev) |
1e29af62 AS |
47 | { |
48 | const struct mfd_cell *cell = mfd_get_cell(pdev); | |
49 | int err = 0; | |
50 | ||
51 | /* only disable if no other clients are using it */ | |
52 | if (atomic_dec_return(cell->usage_count) == 0) | |
53 | err = cell->disable(pdev); | |
54 | ||
55 | /* if the disable hook failed, increment to allow retries */ | |
56 | if (err) | |
57 | atomic_inc(cell->usage_count); | |
58 | ||
59 | /* sanity check; did someone call disable too many times? */ | |
60 | WARN_ON(atomic_read(cell->usage_count) < 0); | |
61 | ||
62 | return err; | |
63 | } | |
f77289ac | 64 | EXPORT_SYMBOL(mfd_cell_disable); |
1e29af62 | 65 | |
e710d7d5 | 66 | static int mfd_platform_add_cell(struct platform_device *pdev, |
03e361b2 GU |
67 | const struct mfd_cell *cell, |
68 | atomic_t *usage_count) | |
e710d7d5 SO |
69 | { |
70 | if (!cell) | |
71 | return 0; | |
72 | ||
73 | pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL); | |
74 | if (!pdev->mfd_cell) | |
75 | return -ENOMEM; | |
76 | ||
03e361b2 | 77 | pdev->mfd_cell->usage_count = usage_count; |
e710d7d5 SO |
78 | return 0; |
79 | } | |
80 | ||
424f525a | 81 | static int mfd_add_device(struct device *parent, int id, |
03e361b2 | 82 | const struct mfd_cell *cell, atomic_t *usage_count, |
7f71ac93 | 83 | struct resource *mem_base, |
0848c94f | 84 | int irq_base, struct irq_domain *domain) |
aa613de6 | 85 | { |
a87903f3 | 86 | struct resource *res; |
aa613de6 | 87 | struct platform_device *pdev; |
c94bb233 | 88 | struct device_node *np = NULL; |
aa613de6 DB |
89 | int ret = -ENOMEM; |
90 | int r; | |
91 | ||
3bed6e41 | 92 | pdev = platform_device_alloc(cell->name, id + cell->id); |
aa613de6 DB |
93 | if (!pdev) |
94 | goto fail_alloc; | |
95 | ||
a87903f3 IM |
96 | res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL); |
97 | if (!res) | |
98 | goto fail_device; | |
99 | ||
424f525a | 100 | pdev->dev.parent = parent; |
b9fbb62e | 101 | pdev->dev.type = &mfd_dev_type; |
b018e136 BS |
102 | pdev->dev.dma_mask = parent->dma_mask; |
103 | pdev->dev.dma_parms = parent->dma_parms; | |
aa613de6 | 104 | |
d137be00 | 105 | ret = regulator_bulk_register_supply_alias( |
7fcd4274 CK |
106 | &pdev->dev, cell->parent_supplies, |
107 | parent, cell->parent_supplies, | |
108 | cell->num_parent_supplies); | |
109 | if (ret < 0) | |
110 | goto fail_res; | |
111 | ||
c94bb233 LJ |
112 | if (parent->of_node && cell->of_compatible) { |
113 | for_each_child_of_node(parent->of_node, np) { | |
114 | if (of_device_is_compatible(np, cell->of_compatible)) { | |
115 | pdev->dev.of_node = np; | |
c94bb233 LJ |
116 | break; |
117 | } | |
118 | } | |
119 | } | |
120 | ||
eb895607 SO |
121 | if (cell->pdata_size) { |
122 | ret = platform_device_add_data(pdev, | |
123 | cell->platform_data, cell->pdata_size); | |
124 | if (ret) | |
7fcd4274 | 125 | goto fail_alias; |
eb895607 SO |
126 | } |
127 | ||
03e361b2 | 128 | ret = mfd_platform_add_cell(pdev, cell, usage_count); |
fe891a00 | 129 | if (ret) |
7fcd4274 | 130 | goto fail_alias; |
aa613de6 | 131 | |
aa613de6 DB |
132 | for (r = 0; r < cell->num_resources; r++) { |
133 | res[r].name = cell->resources[r].name; | |
134 | res[r].flags = cell->resources[r].flags; | |
135 | ||
136 | /* Find out base to use */ | |
f03cfcbc | 137 | if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) { |
aa613de6 DB |
138 | res[r].parent = mem_base; |
139 | res[r].start = mem_base->start + | |
140 | cell->resources[r].start; | |
141 | res[r].end = mem_base->start + | |
142 | cell->resources[r].end; | |
143 | } else if (cell->resources[r].flags & IORESOURCE_IRQ) { | |
c94bb233 LJ |
144 | if (domain) { |
145 | /* Unable to create mappings for IRQ ranges. */ | |
146 | WARN_ON(cell->resources[r].start != | |
147 | cell->resources[r].end); | |
148 | res[r].start = res[r].end = irq_create_mapping( | |
149 | domain, cell->resources[r].start); | |
150 | } else { | |
151 | res[r].start = irq_base + | |
152 | cell->resources[r].start; | |
153 | res[r].end = irq_base + | |
154 | cell->resources[r].end; | |
155 | } | |
aa613de6 DB |
156 | } else { |
157 | res[r].parent = cell->resources[r].parent; | |
158 | res[r].start = cell->resources[r].start; | |
159 | res[r].end = cell->resources[r].end; | |
160 | } | |
91fedede | 161 | |
5f2545fa | 162 | if (!cell->ignore_resource_conflicts) { |
855cc454 | 163 | ret = acpi_check_resource_conflict(&res[r]); |
5f2545fa | 164 | if (ret) |
7fcd4274 | 165 | goto fail_alias; |
5f2545fa | 166 | } |
aa613de6 DB |
167 | } |
168 | ||
8af5fe3b AL |
169 | ret = platform_device_add_resources(pdev, res, cell->num_resources); |
170 | if (ret) | |
7fcd4274 | 171 | goto fail_alias; |
aa613de6 DB |
172 | |
173 | ret = platform_device_add(pdev); | |
174 | if (ret) | |
7fcd4274 | 175 | goto fail_alias; |
a87903f3 | 176 | |
4c90aa94 MB |
177 | if (cell->pm_runtime_no_callbacks) |
178 | pm_runtime_no_callbacks(&pdev->dev); | |
179 | ||
a87903f3 | 180 | kfree(res); |
aa613de6 DB |
181 | |
182 | return 0; | |
183 | ||
7fcd4274 | 184 | fail_alias: |
d137be00 CK |
185 | regulator_bulk_unregister_supply_alias(&pdev->dev, |
186 | cell->parent_supplies, | |
187 | cell->num_parent_supplies); | |
a87903f3 IM |
188 | fail_res: |
189 | kfree(res); | |
aa613de6 DB |
190 | fail_device: |
191 | platform_device_put(pdev); | |
192 | fail_alloc: | |
193 | return ret; | |
194 | } | |
195 | ||
424f525a | 196 | int mfd_add_devices(struct device *parent, int id, |
03e361b2 | 197 | const struct mfd_cell *cells, int n_devs, |
7f71ac93 | 198 | struct resource *mem_base, |
0848c94f | 199 | int irq_base, struct irq_domain *domain) |
aa613de6 DB |
200 | { |
201 | int i; | |
0b208e41 | 202 | int ret; |
1e29af62 AS |
203 | atomic_t *cnts; |
204 | ||
205 | /* initialize reference counting for all cells */ | |
d1b5c5e2 | 206 | cnts = kcalloc(n_devs, sizeof(*cnts), GFP_KERNEL); |
1e29af62 AS |
207 | if (!cnts) |
208 | return -ENOMEM; | |
aa613de6 DB |
209 | |
210 | for (i = 0; i < n_devs; i++) { | |
1e29af62 | 211 | atomic_set(&cnts[i], 0); |
03e361b2 | 212 | ret = mfd_add_device(parent, id, cells + i, cnts + i, mem_base, |
0848c94f | 213 | irq_base, domain); |
aa613de6 | 214 | if (ret) |
0b208e41 | 215 | goto fail; |
aa613de6 DB |
216 | } |
217 | ||
0b208e41 | 218 | return 0; |
aa613de6 | 219 | |
0b208e41 GU |
220 | fail: |
221 | if (i) | |
222 | mfd_remove_devices(parent); | |
223 | else | |
224 | kfree(cnts); | |
aa613de6 DB |
225 | return ret; |
226 | } | |
227 | EXPORT_SYMBOL(mfd_add_devices); | |
228 | ||
1e29af62 | 229 | static int mfd_remove_devices_fn(struct device *dev, void *c) |
aa613de6 | 230 | { |
b9fbb62e CK |
231 | struct platform_device *pdev; |
232 | const struct mfd_cell *cell; | |
1e29af62 AS |
233 | atomic_t **usage_count = c; |
234 | ||
b9fbb62e CK |
235 | if (dev->type != &mfd_dev_type) |
236 | return 0; | |
237 | ||
238 | pdev = to_platform_device(dev); | |
239 | cell = mfd_get_cell(pdev); | |
240 | ||
d137be00 CK |
241 | regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies, |
242 | cell->num_parent_supplies); | |
243 | ||
1e29af62 AS |
244 | /* find the base address of usage_count pointers (for freeing) */ |
245 | if (!*usage_count || (cell->usage_count < *usage_count)) | |
246 | *usage_count = cell->usage_count; | |
247 | ||
248 | platform_device_unregister(pdev); | |
aa613de6 DB |
249 | return 0; |
250 | } | |
251 | ||
424f525a | 252 | void mfd_remove_devices(struct device *parent) |
aa613de6 | 253 | { |
1e29af62 AS |
254 | atomic_t *cnts = NULL; |
255 | ||
256 | device_for_each_child(parent, &cnts, mfd_remove_devices_fn); | |
257 | kfree(cnts); | |
aa613de6 DB |
258 | } |
259 | EXPORT_SYMBOL(mfd_remove_devices); | |
260 | ||
fa1df691 | 261 | int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones) |
a9bbba99 AS |
262 | { |
263 | struct mfd_cell cell_entry; | |
264 | struct device *dev; | |
265 | struct platform_device *pdev; | |
fa1df691 | 266 | int i; |
a9bbba99 AS |
267 | |
268 | /* fetch the parent cell's device (should already be registered!) */ | |
269 | dev = bus_find_device_by_name(&platform_bus_type, NULL, cell); | |
270 | if (!dev) { | |
271 | printk(KERN_ERR "failed to find device for cell %s\n", cell); | |
272 | return -ENODEV; | |
273 | } | |
274 | pdev = to_platform_device(dev); | |
275 | memcpy(&cell_entry, mfd_get_cell(pdev), sizeof(cell_entry)); | |
276 | ||
277 | WARN_ON(!cell_entry.enable); | |
278 | ||
fa1df691 AS |
279 | for (i = 0; i < n_clones; i++) { |
280 | cell_entry.name = clones[i]; | |
281 | /* don't give up if a single call fails; just report error */ | |
03e361b2 GU |
282 | if (mfd_add_device(pdev->dev.parent, -1, &cell_entry, |
283 | cell_entry.usage_count, NULL, 0, NULL)) | |
fa1df691 AS |
284 | dev_err(dev, "failed to create platform device '%s'\n", |
285 | clones[i]); | |
286 | } | |
a9bbba99 | 287 | |
fa1df691 | 288 | return 0; |
a9bbba99 | 289 | } |
fa1df691 | 290 | EXPORT_SYMBOL(mfd_clone_cell); |
a9bbba99 | 291 | |
aa613de6 DB |
292 | MODULE_LICENSE("GPL"); |
293 | MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov"); |