Commit | Line | Data |
---|---|---|
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 | { | |
98a3be44 AS |
85 | const struct mfd_cell_acpi_match *match = cell->acpi_match; |
86 | struct acpi_device *parent, *child; | |
6ab34301 MW |
87 | struct acpi_device *adev; |
88 | ||
98a3be44 AS |
89 | parent = ACPI_COMPANION(pdev->dev.parent); |
90 | if (!parent) | |
6ab34301 MW |
91 | return; |
92 | ||
93 | /* | |
98a3be44 AS |
94 | * MFD child device gets its ACPI handle either from the ACPI device |
95 | * directly under the parent that matches the either _HID or _CID, or | |
96 | * _ADR or it will use the parent handle if is no ID is given. | |
97 | * | |
98 | * Note that use of _ADR is a grey area in the ACPI specification, | |
99 | * though Intel Galileo Gen2 is using it to distinguish the children | |
100 | * devices. | |
6ab34301 | 101 | */ |
98a3be44 AS |
102 | adev = parent; |
103 | if (match) { | |
104 | if (match->pnpid) { | |
105 | struct acpi_device_id ids[2] = {}; | |
106 | ||
107 | strlcpy(ids[0].id, match->pnpid, sizeof(ids[0].id)); | |
108 | list_for_each_entry(child, &parent->children, node) { | |
109 | if (acpi_match_device_ids(child, ids)) { | |
110 | adev = child; | |
111 | break; | |
112 | } | |
6ab34301 | 113 | } |
98a3be44 AS |
114 | } else { |
115 | unsigned long long adr; | |
116 | acpi_status status; | |
117 | ||
118 | list_for_each_entry(child, &parent->children, node) { | |
119 | status = acpi_evaluate_integer(child->handle, | |
120 | "_ADR", NULL, | |
121 | &adr); | |
122 | if (ACPI_SUCCESS(status) && match->adr == adr) { | |
123 | adev = child; | |
124 | break; | |
125 | } | |
126 | } | |
127 | } | |
6ab34301 MW |
128 | } |
129 | ||
130 | ACPI_COMPANION_SET(&pdev->dev, adev); | |
131 | } | |
132 | #else | |
133 | static inline void mfd_acpi_add_device(const struct mfd_cell *cell, | |
134 | struct platform_device *pdev) | |
135 | { | |
136 | } | |
137 | #endif | |
138 | ||
424f525a | 139 | static int mfd_add_device(struct device *parent, int id, |
03e361b2 | 140 | const struct mfd_cell *cell, atomic_t *usage_count, |
7f71ac93 | 141 | struct resource *mem_base, |
0848c94f | 142 | int irq_base, struct irq_domain *domain) |
aa613de6 | 143 | { |
a87903f3 | 144 | struct resource *res; |
aa613de6 | 145 | struct platform_device *pdev; |
c94bb233 | 146 | struct device_node *np = NULL; |
aa613de6 | 147 | int ret = -ENOMEM; |
6e3f62f0 | 148 | int platform_id; |
aa613de6 DB |
149 | int r; |
150 | ||
a77c50b4 | 151 | if (id == PLATFORM_DEVID_AUTO) |
6e3f62f0 JH |
152 | platform_id = id; |
153 | else | |
154 | platform_id = id + cell->id; | |
155 | ||
156 | pdev = platform_device_alloc(cell->name, platform_id); | |
aa613de6 DB |
157 | if (!pdev) |
158 | goto fail_alloc; | |
159 | ||
a87903f3 IM |
160 | res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL); |
161 | if (!res) | |
162 | goto fail_device; | |
163 | ||
424f525a | 164 | pdev->dev.parent = parent; |
b9fbb62e | 165 | pdev->dev.type = &mfd_dev_type; |
b018e136 BS |
166 | pdev->dev.dma_mask = parent->dma_mask; |
167 | pdev->dev.dma_parms = parent->dma_parms; | |
4f08df1b | 168 | pdev->dev.coherent_dma_mask = parent->coherent_dma_mask; |
aa613de6 | 169 | |
d137be00 | 170 | ret = regulator_bulk_register_supply_alias( |
7fcd4274 CK |
171 | &pdev->dev, cell->parent_supplies, |
172 | parent, cell->parent_supplies, | |
173 | cell->num_parent_supplies); | |
174 | if (ret < 0) | |
175 | goto fail_res; | |
176 | ||
c94bb233 LJ |
177 | if (parent->of_node && cell->of_compatible) { |
178 | for_each_child_of_node(parent->of_node, np) { | |
179 | if (of_device_is_compatible(np, cell->of_compatible)) { | |
180 | pdev->dev.of_node = np; | |
c94bb233 LJ |
181 | break; |
182 | } | |
183 | } | |
184 | } | |
185 | ||
6ab34301 MW |
186 | mfd_acpi_add_device(cell, pdev); |
187 | ||
eb895607 SO |
188 | if (cell->pdata_size) { |
189 | ret = platform_device_add_data(pdev, | |
190 | cell->platform_data, cell->pdata_size); | |
191 | if (ret) | |
7fcd4274 | 192 | goto fail_alias; |
eb895607 SO |
193 | } |
194 | ||
03e361b2 | 195 | ret = mfd_platform_add_cell(pdev, cell, usage_count); |
fe891a00 | 196 | if (ret) |
7fcd4274 | 197 | goto fail_alias; |
aa613de6 | 198 | |
aa613de6 DB |
199 | for (r = 0; r < cell->num_resources; r++) { |
200 | res[r].name = cell->resources[r].name; | |
201 | res[r].flags = cell->resources[r].flags; | |
202 | ||
203 | /* Find out base to use */ | |
f03cfcbc | 204 | if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) { |
aa613de6 DB |
205 | res[r].parent = mem_base; |
206 | res[r].start = mem_base->start + | |
207 | cell->resources[r].start; | |
208 | res[r].end = mem_base->start + | |
209 | cell->resources[r].end; | |
210 | } else if (cell->resources[r].flags & IORESOURCE_IRQ) { | |
c94bb233 LJ |
211 | if (domain) { |
212 | /* Unable to create mappings for IRQ ranges. */ | |
213 | WARN_ON(cell->resources[r].start != | |
214 | cell->resources[r].end); | |
215 | res[r].start = res[r].end = irq_create_mapping( | |
216 | domain, cell->resources[r].start); | |
217 | } else { | |
218 | res[r].start = irq_base + | |
219 | cell->resources[r].start; | |
220 | res[r].end = irq_base + | |
221 | cell->resources[r].end; | |
222 | } | |
aa613de6 DB |
223 | } else { |
224 | res[r].parent = cell->resources[r].parent; | |
225 | res[r].start = cell->resources[r].start; | |
226 | res[r].end = cell->resources[r].end; | |
227 | } | |
91fedede | 228 | |
5f2545fa | 229 | if (!cell->ignore_resource_conflicts) { |
ec40c606 LP |
230 | if (has_acpi_companion(&pdev->dev)) { |
231 | ret = acpi_check_resource_conflict(&res[r]); | |
232 | if (ret) | |
233 | goto fail_alias; | |
234 | } | |
5f2545fa | 235 | } |
aa613de6 DB |
236 | } |
237 | ||
8af5fe3b AL |
238 | ret = platform_device_add_resources(pdev, res, cell->num_resources); |
239 | if (ret) | |
7fcd4274 | 240 | goto fail_alias; |
aa613de6 DB |
241 | |
242 | ret = platform_device_add(pdev); | |
243 | if (ret) | |
7fcd4274 | 244 | goto fail_alias; |
a87903f3 | 245 | |
4c90aa94 MB |
246 | if (cell->pm_runtime_no_callbacks) |
247 | pm_runtime_no_callbacks(&pdev->dev); | |
248 | ||
a87903f3 | 249 | kfree(res); |
aa613de6 DB |
250 | |
251 | return 0; | |
252 | ||
7fcd4274 | 253 | fail_alias: |
d137be00 CK |
254 | regulator_bulk_unregister_supply_alias(&pdev->dev, |
255 | cell->parent_supplies, | |
256 | cell->num_parent_supplies); | |
a87903f3 IM |
257 | fail_res: |
258 | kfree(res); | |
aa613de6 DB |
259 | fail_device: |
260 | platform_device_put(pdev); | |
261 | fail_alloc: | |
262 | return ret; | |
263 | } | |
264 | ||
424f525a | 265 | int mfd_add_devices(struct device *parent, int id, |
03e361b2 | 266 | const struct mfd_cell *cells, int n_devs, |
7f71ac93 | 267 | struct resource *mem_base, |
0848c94f | 268 | int irq_base, struct irq_domain *domain) |
aa613de6 DB |
269 | { |
270 | int i; | |
0b208e41 | 271 | int ret; |
1e29af62 AS |
272 | atomic_t *cnts; |
273 | ||
274 | /* initialize reference counting for all cells */ | |
d1b5c5e2 | 275 | cnts = kcalloc(n_devs, sizeof(*cnts), GFP_KERNEL); |
1e29af62 AS |
276 | if (!cnts) |
277 | return -ENOMEM; | |
aa613de6 DB |
278 | |
279 | for (i = 0; i < n_devs; i++) { | |
1e29af62 | 280 | atomic_set(&cnts[i], 0); |
03e361b2 | 281 | ret = mfd_add_device(parent, id, cells + i, cnts + i, mem_base, |
0848c94f | 282 | irq_base, domain); |
aa613de6 | 283 | if (ret) |
0b208e41 | 284 | goto fail; |
aa613de6 DB |
285 | } |
286 | ||
0b208e41 | 287 | return 0; |
aa613de6 | 288 | |
0b208e41 GU |
289 | fail: |
290 | if (i) | |
291 | mfd_remove_devices(parent); | |
292 | else | |
293 | kfree(cnts); | |
aa613de6 DB |
294 | return ret; |
295 | } | |
296 | EXPORT_SYMBOL(mfd_add_devices); | |
297 | ||
1e29af62 | 298 | static int mfd_remove_devices_fn(struct device *dev, void *c) |
aa613de6 | 299 | { |
b9fbb62e CK |
300 | struct platform_device *pdev; |
301 | const struct mfd_cell *cell; | |
1e29af62 AS |
302 | atomic_t **usage_count = c; |
303 | ||
b9fbb62e CK |
304 | if (dev->type != &mfd_dev_type) |
305 | return 0; | |
306 | ||
307 | pdev = to_platform_device(dev); | |
308 | cell = mfd_get_cell(pdev); | |
309 | ||
d137be00 CK |
310 | regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies, |
311 | cell->num_parent_supplies); | |
312 | ||
1e29af62 AS |
313 | /* find the base address of usage_count pointers (for freeing) */ |
314 | if (!*usage_count || (cell->usage_count < *usage_count)) | |
315 | *usage_count = cell->usage_count; | |
316 | ||
317 | platform_device_unregister(pdev); | |
aa613de6 DB |
318 | return 0; |
319 | } | |
320 | ||
424f525a | 321 | void mfd_remove_devices(struct device *parent) |
aa613de6 | 322 | { |
1e29af62 AS |
323 | atomic_t *cnts = NULL; |
324 | ||
b9a8a271 | 325 | device_for_each_child_reverse(parent, &cnts, mfd_remove_devices_fn); |
1e29af62 | 326 | kfree(cnts); |
aa613de6 DB |
327 | } |
328 | EXPORT_SYMBOL(mfd_remove_devices); | |
329 | ||
fa1df691 | 330 | int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones) |
a9bbba99 AS |
331 | { |
332 | struct mfd_cell cell_entry; | |
333 | struct device *dev; | |
334 | struct platform_device *pdev; | |
fa1df691 | 335 | int i; |
a9bbba99 AS |
336 | |
337 | /* fetch the parent cell's device (should already be registered!) */ | |
338 | dev = bus_find_device_by_name(&platform_bus_type, NULL, cell); | |
339 | if (!dev) { | |
340 | printk(KERN_ERR "failed to find device for cell %s\n", cell); | |
341 | return -ENODEV; | |
342 | } | |
343 | pdev = to_platform_device(dev); | |
344 | memcpy(&cell_entry, mfd_get_cell(pdev), sizeof(cell_entry)); | |
345 | ||
346 | WARN_ON(!cell_entry.enable); | |
347 | ||
fa1df691 AS |
348 | for (i = 0; i < n_clones; i++) { |
349 | cell_entry.name = clones[i]; | |
350 | /* don't give up if a single call fails; just report error */ | |
03e361b2 GU |
351 | if (mfd_add_device(pdev->dev.parent, -1, &cell_entry, |
352 | cell_entry.usage_count, NULL, 0, NULL)) | |
fa1df691 AS |
353 | dev_err(dev, "failed to create platform device '%s'\n", |
354 | clones[i]); | |
355 | } | |
a9bbba99 | 356 | |
fa1df691 | 357 | return 0; |
a9bbba99 | 358 | } |
fa1df691 | 359 | EXPORT_SYMBOL(mfd_clone_cell); |
a9bbba99 | 360 | |
aa613de6 DB |
361 | MODULE_LICENSE("GPL"); |
362 | MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov"); |