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 | ||
6ab34301 MW |
81 | #if IS_ENABLED(CONFIG_ACPI) |
82 | static void mfd_acpi_add_device(const struct mfd_cell *cell, | |
83 | struct platform_device *pdev) | |
84 | { | |
85 | struct acpi_device *parent_adev; | |
86 | struct acpi_device *adev; | |
87 | ||
88 | parent_adev = ACPI_COMPANION(pdev->dev.parent); | |
89 | if (!parent_adev) | |
90 | return; | |
91 | ||
92 | /* | |
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. | |
96 | */ | |
97 | adev = parent_adev; | |
98 | if (cell->acpi_pnpid) { | |
99 | struct acpi_device_id ids[2] = {}; | |
100 | struct acpi_device *child_adev; | |
101 | ||
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)) { | |
105 | adev = child_adev; | |
106 | break; | |
107 | } | |
108 | } | |
109 | ||
110 | ACPI_COMPANION_SET(&pdev->dev, adev); | |
111 | } | |
112 | #else | |
113 | static inline void mfd_acpi_add_device(const struct mfd_cell *cell, | |
114 | struct platform_device *pdev) | |
115 | { | |
116 | } | |
117 | #endif | |
118 | ||
424f525a | 119 | static int mfd_add_device(struct device *parent, int id, |
03e361b2 | 120 | const struct mfd_cell *cell, atomic_t *usage_count, |
7f71ac93 | 121 | struct resource *mem_base, |
0848c94f | 122 | int irq_base, struct irq_domain *domain) |
aa613de6 | 123 | { |
a87903f3 | 124 | struct resource *res; |
aa613de6 | 125 | struct platform_device *pdev; |
c94bb233 | 126 | struct device_node *np = NULL; |
aa613de6 | 127 | int ret = -ENOMEM; |
6e3f62f0 | 128 | int platform_id; |
aa613de6 DB |
129 | int r; |
130 | ||
6e3f62f0 JH |
131 | if (id < 0) |
132 | platform_id = id; | |
133 | else | |
134 | platform_id = id + cell->id; | |
135 | ||
136 | pdev = platform_device_alloc(cell->name, platform_id); | |
aa613de6 DB |
137 | if (!pdev) |
138 | goto fail_alloc; | |
139 | ||
a87903f3 IM |
140 | res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL); |
141 | if (!res) | |
142 | goto fail_device; | |
143 | ||
424f525a | 144 | pdev->dev.parent = parent; |
b9fbb62e | 145 | pdev->dev.type = &mfd_dev_type; |
b018e136 BS |
146 | pdev->dev.dma_mask = parent->dma_mask; |
147 | pdev->dev.dma_parms = parent->dma_parms; | |
4f08df1b | 148 | pdev->dev.coherent_dma_mask = parent->coherent_dma_mask; |
aa613de6 | 149 | |
d137be00 | 150 | ret = regulator_bulk_register_supply_alias( |
7fcd4274 CK |
151 | &pdev->dev, cell->parent_supplies, |
152 | parent, cell->parent_supplies, | |
153 | cell->num_parent_supplies); | |
154 | if (ret < 0) | |
155 | goto fail_res; | |
156 | ||
c94bb233 LJ |
157 | if (parent->of_node && cell->of_compatible) { |
158 | for_each_child_of_node(parent->of_node, np) { | |
159 | if (of_device_is_compatible(np, cell->of_compatible)) { | |
160 | pdev->dev.of_node = np; | |
c94bb233 LJ |
161 | break; |
162 | } | |
163 | } | |
164 | } | |
165 | ||
6ab34301 MW |
166 | mfd_acpi_add_device(cell, pdev); |
167 | ||
eb895607 SO |
168 | if (cell->pdata_size) { |
169 | ret = platform_device_add_data(pdev, | |
170 | cell->platform_data, cell->pdata_size); | |
171 | if (ret) | |
7fcd4274 | 172 | goto fail_alias; |
eb895607 SO |
173 | } |
174 | ||
03e361b2 | 175 | ret = mfd_platform_add_cell(pdev, cell, usage_count); |
fe891a00 | 176 | if (ret) |
7fcd4274 | 177 | goto fail_alias; |
aa613de6 | 178 | |
aa613de6 DB |
179 | for (r = 0; r < cell->num_resources; r++) { |
180 | res[r].name = cell->resources[r].name; | |
181 | res[r].flags = cell->resources[r].flags; | |
182 | ||
183 | /* Find out base to use */ | |
f03cfcbc | 184 | if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) { |
aa613de6 DB |
185 | res[r].parent = mem_base; |
186 | res[r].start = mem_base->start + | |
187 | cell->resources[r].start; | |
188 | res[r].end = mem_base->start + | |
189 | cell->resources[r].end; | |
190 | } else if (cell->resources[r].flags & IORESOURCE_IRQ) { | |
c94bb233 LJ |
191 | if (domain) { |
192 | /* Unable to create mappings for IRQ ranges. */ | |
193 | WARN_ON(cell->resources[r].start != | |
194 | cell->resources[r].end); | |
195 | res[r].start = res[r].end = irq_create_mapping( | |
196 | domain, cell->resources[r].start); | |
197 | } else { | |
198 | res[r].start = irq_base + | |
199 | cell->resources[r].start; | |
200 | res[r].end = irq_base + | |
201 | cell->resources[r].end; | |
202 | } | |
aa613de6 DB |
203 | } else { |
204 | res[r].parent = cell->resources[r].parent; | |
205 | res[r].start = cell->resources[r].start; | |
206 | res[r].end = cell->resources[r].end; | |
207 | } | |
91fedede | 208 | |
5f2545fa | 209 | if (!cell->ignore_resource_conflicts) { |
855cc454 | 210 | ret = acpi_check_resource_conflict(&res[r]); |
5f2545fa | 211 | if (ret) |
7fcd4274 | 212 | goto fail_alias; |
5f2545fa | 213 | } |
aa613de6 DB |
214 | } |
215 | ||
8af5fe3b AL |
216 | ret = platform_device_add_resources(pdev, res, cell->num_resources); |
217 | if (ret) | |
7fcd4274 | 218 | goto fail_alias; |
aa613de6 DB |
219 | |
220 | ret = platform_device_add(pdev); | |
221 | if (ret) | |
7fcd4274 | 222 | goto fail_alias; |
a87903f3 | 223 | |
4c90aa94 MB |
224 | if (cell->pm_runtime_no_callbacks) |
225 | pm_runtime_no_callbacks(&pdev->dev); | |
226 | ||
a87903f3 | 227 | kfree(res); |
aa613de6 DB |
228 | |
229 | return 0; | |
230 | ||
7fcd4274 | 231 | fail_alias: |
d137be00 CK |
232 | regulator_bulk_unregister_supply_alias(&pdev->dev, |
233 | cell->parent_supplies, | |
234 | cell->num_parent_supplies); | |
a87903f3 IM |
235 | fail_res: |
236 | kfree(res); | |
aa613de6 DB |
237 | fail_device: |
238 | platform_device_put(pdev); | |
239 | fail_alloc: | |
240 | return ret; | |
241 | } | |
242 | ||
424f525a | 243 | int mfd_add_devices(struct device *parent, int id, |
03e361b2 | 244 | const struct mfd_cell *cells, int n_devs, |
7f71ac93 | 245 | struct resource *mem_base, |
0848c94f | 246 | int irq_base, struct irq_domain *domain) |
aa613de6 DB |
247 | { |
248 | int i; | |
0b208e41 | 249 | int ret; |
1e29af62 AS |
250 | atomic_t *cnts; |
251 | ||
252 | /* initialize reference counting for all cells */ | |
d1b5c5e2 | 253 | cnts = kcalloc(n_devs, sizeof(*cnts), GFP_KERNEL); |
1e29af62 AS |
254 | if (!cnts) |
255 | return -ENOMEM; | |
aa613de6 DB |
256 | |
257 | for (i = 0; i < n_devs; i++) { | |
1e29af62 | 258 | atomic_set(&cnts[i], 0); |
03e361b2 | 259 | ret = mfd_add_device(parent, id, cells + i, cnts + i, mem_base, |
0848c94f | 260 | irq_base, domain); |
aa613de6 | 261 | if (ret) |
0b208e41 | 262 | goto fail; |
aa613de6 DB |
263 | } |
264 | ||
0b208e41 | 265 | return 0; |
aa613de6 | 266 | |
0b208e41 GU |
267 | fail: |
268 | if (i) | |
269 | mfd_remove_devices(parent); | |
270 | else | |
271 | kfree(cnts); | |
aa613de6 DB |
272 | return ret; |
273 | } | |
274 | EXPORT_SYMBOL(mfd_add_devices); | |
275 | ||
1e29af62 | 276 | static int mfd_remove_devices_fn(struct device *dev, void *c) |
aa613de6 | 277 | { |
b9fbb62e CK |
278 | struct platform_device *pdev; |
279 | const struct mfd_cell *cell; | |
1e29af62 AS |
280 | atomic_t **usage_count = c; |
281 | ||
b9fbb62e CK |
282 | if (dev->type != &mfd_dev_type) |
283 | return 0; | |
284 | ||
285 | pdev = to_platform_device(dev); | |
286 | cell = mfd_get_cell(pdev); | |
287 | ||
d137be00 CK |
288 | regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies, |
289 | cell->num_parent_supplies); | |
290 | ||
1e29af62 AS |
291 | /* find the base address of usage_count pointers (for freeing) */ |
292 | if (!*usage_count || (cell->usage_count < *usage_count)) | |
293 | *usage_count = cell->usage_count; | |
294 | ||
295 | platform_device_unregister(pdev); | |
aa613de6 DB |
296 | return 0; |
297 | } | |
298 | ||
424f525a | 299 | void mfd_remove_devices(struct device *parent) |
aa613de6 | 300 | { |
1e29af62 AS |
301 | atomic_t *cnts = NULL; |
302 | ||
303 | device_for_each_child(parent, &cnts, mfd_remove_devices_fn); | |
304 | kfree(cnts); | |
aa613de6 DB |
305 | } |
306 | EXPORT_SYMBOL(mfd_remove_devices); | |
307 | ||
fa1df691 | 308 | int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones) |
a9bbba99 AS |
309 | { |
310 | struct mfd_cell cell_entry; | |
311 | struct device *dev; | |
312 | struct platform_device *pdev; | |
fa1df691 | 313 | int i; |
a9bbba99 AS |
314 | |
315 | /* fetch the parent cell's device (should already be registered!) */ | |
316 | dev = bus_find_device_by_name(&platform_bus_type, NULL, cell); | |
317 | if (!dev) { | |
318 | printk(KERN_ERR "failed to find device for cell %s\n", cell); | |
319 | return -ENODEV; | |
320 | } | |
321 | pdev = to_platform_device(dev); | |
322 | memcpy(&cell_entry, mfd_get_cell(pdev), sizeof(cell_entry)); | |
323 | ||
324 | WARN_ON(!cell_entry.enable); | |
325 | ||
fa1df691 AS |
326 | for (i = 0; i < n_clones; i++) { |
327 | cell_entry.name = clones[i]; | |
328 | /* don't give up if a single call fails; just report error */ | |
03e361b2 GU |
329 | if (mfd_add_device(pdev->dev.parent, -1, &cell_entry, |
330 | cell_entry.usage_count, NULL, 0, NULL)) | |
fa1df691 AS |
331 | dev_err(dev, "failed to create platform device '%s'\n", |
332 | clones[i]); | |
333 | } | |
a9bbba99 | 334 | |
fa1df691 | 335 | return 0; |
a9bbba99 | 336 | } |
fa1df691 | 337 | EXPORT_SYMBOL(mfd_clone_cell); |
a9bbba99 | 338 | |
aa613de6 DB |
339 | MODULE_LICENSE("GPL"); |
340 | MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov"); |