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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * drivers/mfd/mfd-core.c
4 *
5 * core MFD support
6 * Copyright (c) 2006 Ian Molton
7 * Copyright (c) 2007,2008 Dmitry Baryshkov
8 */
9
10#include <linux/kernel.h>
11#include <linux/platform_device.h>
12#include <linux/acpi.h>
13#include <linux/list.h>
14#include <linux/property.h>
15#include <linux/mfd/core.h>
16#include <linux/pm_runtime.h>
17#include <linux/slab.h>
18#include <linux/module.h>
19#include <linux/irqdomain.h>
20#include <linux/of.h>
21#include <linux/of_address.h>
22#include <linux/regulator/consumer.h>
23
24static LIST_HEAD(mfd_of_node_list);
25
26struct mfd_of_node_entry {
27 struct list_head list;
28 struct device *dev;
29 struct device_node *np;
30};
31
32static struct device_type mfd_dev_type = {
33 .name = "mfd_device",
34};
35
36int mfd_cell_enable(struct platform_device *pdev)
37{
38 const struct mfd_cell *cell = mfd_get_cell(pdev);
39
40 if (!cell->enable) {
41 dev_dbg(&pdev->dev, "No .enable() call-back registered\n");
42 return 0;
43 }
44
45 return cell->enable(pdev);
46}
47EXPORT_SYMBOL(mfd_cell_enable);
48
49int mfd_cell_disable(struct platform_device *pdev)
50{
51 const struct mfd_cell *cell = mfd_get_cell(pdev);
52
53 if (!cell->disable) {
54 dev_dbg(&pdev->dev, "No .disable() call-back registered\n");
55 return 0;
56 }
57
58 return cell->disable(pdev);
59}
60EXPORT_SYMBOL(mfd_cell_disable);
61
62#if IS_ENABLED(CONFIG_ACPI)
63static void mfd_acpi_add_device(const struct mfd_cell *cell,
64 struct platform_device *pdev)
65{
66 const struct mfd_cell_acpi_match *match = cell->acpi_match;
67 struct acpi_device *parent, *child;
68 struct acpi_device *adev;
69
70 parent = ACPI_COMPANION(pdev->dev.parent);
71 if (!parent)
72 return;
73
74 /*
75 * MFD child device gets its ACPI handle either from the ACPI device
76 * directly under the parent that matches the either _HID or _CID, or
77 * _ADR or it will use the parent handle if is no ID is given.
78 *
79 * Note that use of _ADR is a grey area in the ACPI specification,
80 * though Intel Galileo Gen2 is using it to distinguish the children
81 * devices.
82 */
83 adev = parent;
84 if (match) {
85 if (match->pnpid) {
86 struct acpi_device_id ids[2] = {};
87
88 strlcpy(ids[0].id, match->pnpid, sizeof(ids[0].id));
89 list_for_each_entry(child, &parent->children, node) {
90 if (!acpi_match_device_ids(child, ids)) {
91 adev = child;
92 break;
93 }
94 }
95 } else {
96 unsigned long long adr;
97 acpi_status status;
98
99 list_for_each_entry(child, &parent->children, node) {
100 status = acpi_evaluate_integer(child->handle,
101 "_ADR", NULL,
102 &adr);
103 if (ACPI_SUCCESS(status) && match->adr == adr) {
104 adev = child;
105 break;
106 }
107 }
108 }
109 }
110
111 ACPI_COMPANION_SET(&pdev->dev, adev);
112}
113#else
114static inline void mfd_acpi_add_device(const struct mfd_cell *cell,
115 struct platform_device *pdev)
116{
117}
118#endif
119
120static int mfd_match_of_node_to_dev(struct platform_device *pdev,
121 struct device_node *np,
122 const struct mfd_cell *cell)
123{
124#if IS_ENABLED(CONFIG_OF)
125 struct mfd_of_node_entry *of_entry;
126 const __be32 *reg;
127 u64 of_node_addr;
128
129 /* Skip if OF node has previously been allocated to a device */
130 list_for_each_entry(of_entry, &mfd_of_node_list, list)
131 if (of_entry->np == np)
132 return -EAGAIN;
133
134 if (!cell->use_of_reg)
135 /* No of_reg defined - allocate first free compatible match */
136 goto allocate_of_node;
137
138 /* We only care about each node's first defined address */
139 reg = of_get_address(np, 0, NULL, NULL);
140 if (!reg)
141 /* OF node does not contatin a 'reg' property to match to */
142 return -EAGAIN;
143
144 of_node_addr = of_read_number(reg, of_n_addr_cells(np));
145
146 if (cell->of_reg != of_node_addr)
147 /* No match */
148 return -EAGAIN;
149
150allocate_of_node:
151 of_entry = kzalloc(sizeof(*of_entry), GFP_KERNEL);
152 if (!of_entry)
153 return -ENOMEM;
154
155 of_entry->dev = &pdev->dev;
156 of_entry->np = np;
157 list_add_tail(&of_entry->list, &mfd_of_node_list);
158
159 pdev->dev.of_node = np;
160 pdev->dev.fwnode = &np->fwnode;
161#endif
162 return 0;
163}
164
165static int mfd_add_device(struct device *parent, int id,
166 const struct mfd_cell *cell,
167 struct resource *mem_base,
168 int irq_base, struct irq_domain *domain)
169{
170 struct resource *res;
171 struct platform_device *pdev;
172 struct device_node *np = NULL;
173 struct mfd_of_node_entry *of_entry, *tmp;
174 int ret = -ENOMEM;
175 int platform_id;
176 int r;
177
178 if (id == PLATFORM_DEVID_AUTO)
179 platform_id = id;
180 else
181 platform_id = id + cell->id;
182
183 pdev = platform_device_alloc(cell->name, platform_id);
184 if (!pdev)
185 goto fail_alloc;
186
187 pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL);
188 if (!pdev->mfd_cell)
189 goto fail_device;
190
191 res = kcalloc(cell->num_resources, sizeof(*res), GFP_KERNEL);
192 if (!res)
193 goto fail_device;
194
195 pdev->dev.parent = parent;
196 pdev->dev.type = &mfd_dev_type;
197 pdev->dev.dma_mask = parent->dma_mask;
198 pdev->dev.dma_parms = parent->dma_parms;
199 pdev->dev.coherent_dma_mask = parent->coherent_dma_mask;
200
201 ret = regulator_bulk_register_supply_alias(
202 &pdev->dev, cell->parent_supplies,
203 parent, cell->parent_supplies,
204 cell->num_parent_supplies);
205 if (ret < 0)
206 goto fail_res;
207
208 if (IS_ENABLED(CONFIG_OF) && parent->of_node && cell->of_compatible) {
209 for_each_child_of_node(parent->of_node, np) {
210 if (of_device_is_compatible(np, cell->of_compatible)) {
211 /* Ignore 'disabled' devices error free */
212 if (!of_device_is_available(np)) {
213 ret = 0;
214 goto fail_alias;
215 }
216
217 ret = mfd_match_of_node_to_dev(pdev, np, cell);
218 if (ret == -EAGAIN)
219 continue;
220 if (ret)
221 goto fail_alias;
222
223 break;
224 }
225 }
226
227 if (!pdev->dev.of_node)
228 pr_warn("%s: Failed to locate of_node [id: %d]\n",
229 cell->name, platform_id);
230 }
231
232 mfd_acpi_add_device(cell, pdev);
233
234 if (cell->pdata_size) {
235 ret = platform_device_add_data(pdev,
236 cell->platform_data, cell->pdata_size);
237 if (ret)
238 goto fail_of_entry;
239 }
240
241 if (cell->properties) {
242 ret = platform_device_add_properties(pdev, cell->properties);
243 if (ret)
244 goto fail_of_entry;
245 }
246
247 for (r = 0; r < cell->num_resources; r++) {
248 res[r].name = cell->resources[r].name;
249 res[r].flags = cell->resources[r].flags;
250
251 /* Find out base to use */
252 if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) {
253 res[r].parent = mem_base;
254 res[r].start = mem_base->start +
255 cell->resources[r].start;
256 res[r].end = mem_base->start +
257 cell->resources[r].end;
258 } else if (cell->resources[r].flags & IORESOURCE_IRQ) {
259 if (domain) {
260 /* Unable to create mappings for IRQ ranges. */
261 WARN_ON(cell->resources[r].start !=
262 cell->resources[r].end);
263 res[r].start = res[r].end = irq_create_mapping(
264 domain, cell->resources[r].start);
265 } else {
266 res[r].start = irq_base +
267 cell->resources[r].start;
268 res[r].end = irq_base +
269 cell->resources[r].end;
270 }
271 } else {
272 res[r].parent = cell->resources[r].parent;
273 res[r].start = cell->resources[r].start;
274 res[r].end = cell->resources[r].end;
275 }
276
277 if (!cell->ignore_resource_conflicts) {
278 if (has_acpi_companion(&pdev->dev)) {
279 ret = acpi_check_resource_conflict(&res[r]);
280 if (ret)
281 goto fail_of_entry;
282 }
283 }
284 }
285
286 ret = platform_device_add_resources(pdev, res, cell->num_resources);
287 if (ret)
288 goto fail_of_entry;
289
290 ret = platform_device_add(pdev);
291 if (ret)
292 goto fail_of_entry;
293
294 if (cell->pm_runtime_no_callbacks)
295 pm_runtime_no_callbacks(&pdev->dev);
296
297 kfree(res);
298
299 return 0;
300
301fail_of_entry:
302 list_for_each_entry_safe(of_entry, tmp, &mfd_of_node_list, list)
303 if (of_entry->dev == &pdev->dev) {
304 list_del(&of_entry->list);
305 kfree(of_entry);
306 }
307fail_alias:
308 regulator_bulk_unregister_supply_alias(&pdev->dev,
309 cell->parent_supplies,
310 cell->num_parent_supplies);
311fail_res:
312 kfree(res);
313fail_device:
314 platform_device_put(pdev);
315fail_alloc:
316 return ret;
317}
318
319/**
320 * mfd_add_devices - register child devices
321 *
322 * @parent: Pointer to parent device.
323 * @id: Can be PLATFORM_DEVID_AUTO to let the Platform API take care
324 * of device numbering, or will be added to a device's cell_id.
325 * @cells: Array of (struct mfd_cell)s describing child devices.
326 * @n_devs: Number of child devices to register.
327 * @mem_base: Parent register range resource for child devices.
328 * @irq_base: Base of the range of virtual interrupt numbers allocated for
329 * this MFD device. Unused if @domain is specified.
330 * @domain: Interrupt domain to create mappings for hardware interrupts.
331 */
332int mfd_add_devices(struct device *parent, int id,
333 const struct mfd_cell *cells, int n_devs,
334 struct resource *mem_base,
335 int irq_base, struct irq_domain *domain)
336{
337 int i;
338 int ret;
339
340 for (i = 0; i < n_devs; i++) {
341 ret = mfd_add_device(parent, id, cells + i, mem_base,
342 irq_base, domain);
343 if (ret)
344 goto fail;
345 }
346
347 return 0;
348
349fail:
350 if (i)
351 mfd_remove_devices(parent);
352
353 return ret;
354}
355EXPORT_SYMBOL(mfd_add_devices);
356
357static int mfd_remove_devices_fn(struct device *dev, void *data)
358{
359 struct platform_device *pdev;
360 const struct mfd_cell *cell;
361 int *level = data;
362
363 if (dev->type != &mfd_dev_type)
364 return 0;
365
366 pdev = to_platform_device(dev);
367 cell = mfd_get_cell(pdev);
368
369 if (level && cell->level > *level)
370 return 0;
371
372 regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies,
373 cell->num_parent_supplies);
374
375 platform_device_unregister(pdev);
376 return 0;
377}
378
379void mfd_remove_devices_late(struct device *parent)
380{
381 int level = MFD_DEP_LEVEL_HIGH;
382
383 device_for_each_child_reverse(parent, &level, mfd_remove_devices_fn);
384}
385EXPORT_SYMBOL(mfd_remove_devices_late);
386
387void mfd_remove_devices(struct device *parent)
388{
389 int level = MFD_DEP_LEVEL_NORMAL;
390
391 device_for_each_child_reverse(parent, &level, mfd_remove_devices_fn);
392}
393EXPORT_SYMBOL(mfd_remove_devices);
394
395static void devm_mfd_dev_release(struct device *dev, void *res)
396{
397 mfd_remove_devices(dev);
398}
399
400/**
401 * devm_mfd_add_devices - Resource managed version of mfd_add_devices()
402 *
403 * Returns 0 on success or an appropriate negative error number on failure.
404 * All child-devices of the MFD will automatically be removed when it gets
405 * unbinded.
406 *
407 * @dev: Pointer to parent device.
408 * @id: Can be PLATFORM_DEVID_AUTO to let the Platform API take care
409 * of device numbering, or will be added to a device's cell_id.
410 * @cells: Array of (struct mfd_cell)s describing child devices.
411 * @n_devs: Number of child devices to register.
412 * @mem_base: Parent register range resource for child devices.
413 * @irq_base: Base of the range of virtual interrupt numbers allocated for
414 * this MFD device. Unused if @domain is specified.
415 * @domain: Interrupt domain to create mappings for hardware interrupts.
416 */
417int devm_mfd_add_devices(struct device *dev, int id,
418 const struct mfd_cell *cells, int n_devs,
419 struct resource *mem_base,
420 int irq_base, struct irq_domain *domain)
421{
422 struct device **ptr;
423 int ret;
424
425 ptr = devres_alloc(devm_mfd_dev_release, sizeof(*ptr), GFP_KERNEL);
426 if (!ptr)
427 return -ENOMEM;
428
429 ret = mfd_add_devices(dev, id, cells, n_devs, mem_base,
430 irq_base, domain);
431 if (ret < 0) {
432 devres_free(ptr);
433 return ret;
434 }
435
436 *ptr = dev;
437 devres_add(dev, ptr);
438
439 return ret;
440}
441EXPORT_SYMBOL(devm_mfd_add_devices);
442
443MODULE_LICENSE("GPL");
444MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * drivers/mfd/mfd-core.c
4 *
5 * core MFD support
6 * Copyright (c) 2006 Ian Molton
7 * Copyright (c) 2007,2008 Dmitry Baryshkov
8 */
9
10#include <linux/kernel.h>
11#include <linux/platform_device.h>
12#include <linux/acpi.h>
13#include <linux/list.h>
14#include <linux/property.h>
15#include <linux/mfd/core.h>
16#include <linux/pm_runtime.h>
17#include <linux/slab.h>
18#include <linux/module.h>
19#include <linux/irqdomain.h>
20#include <linux/of.h>
21#include <linux/of_address.h>
22#include <linux/regulator/consumer.h>
23
24static LIST_HEAD(mfd_of_node_list);
25
26struct mfd_of_node_entry {
27 struct list_head list;
28 struct device *dev;
29 struct device_node *np;
30};
31
32static const struct device_type mfd_dev_type = {
33 .name = "mfd_device",
34};
35
36#if IS_ENABLED(CONFIG_ACPI)
37struct match_ids_walk_data {
38 struct acpi_device_id *ids;
39 struct acpi_device *adev;
40};
41
42static int match_device_ids(struct acpi_device *adev, void *data)
43{
44 struct match_ids_walk_data *wd = data;
45
46 if (!acpi_match_device_ids(adev, wd->ids)) {
47 wd->adev = adev;
48 return 1;
49 }
50
51 return 0;
52}
53
54static void mfd_acpi_add_device(const struct mfd_cell *cell,
55 struct platform_device *pdev)
56{
57 const struct mfd_cell_acpi_match *match = cell->acpi_match;
58 struct acpi_device *adev = NULL;
59 struct acpi_device *parent;
60
61 parent = ACPI_COMPANION(pdev->dev.parent);
62 if (!parent)
63 return;
64
65 /*
66 * MFD child device gets its ACPI handle either from the ACPI device
67 * directly under the parent that matches the either _HID or _CID, or
68 * _ADR or it will use the parent handle if is no ID is given.
69 *
70 * Note that use of _ADR is a grey area in the ACPI specification,
71 * though at least Intel Galileo Gen 2 is using it to distinguish
72 * the children devices.
73 */
74 if (match) {
75 if (match->pnpid) {
76 struct acpi_device_id ids[2] = {};
77 struct match_ids_walk_data wd = {
78 .adev = NULL,
79 .ids = ids,
80 };
81
82 strscpy(ids[0].id, match->pnpid, sizeof(ids[0].id));
83 acpi_dev_for_each_child(parent, match_device_ids, &wd);
84 adev = wd.adev;
85 } else {
86 adev = acpi_find_child_device(parent, match->adr, false);
87 }
88 }
89
90 device_set_node(&pdev->dev, acpi_fwnode_handle(adev ?: parent));
91}
92#else
93static inline void mfd_acpi_add_device(const struct mfd_cell *cell,
94 struct platform_device *pdev)
95{
96}
97#endif
98
99static int mfd_match_of_node_to_dev(struct platform_device *pdev,
100 struct device_node *np,
101 const struct mfd_cell *cell)
102{
103#if IS_ENABLED(CONFIG_OF)
104 struct mfd_of_node_entry *of_entry;
105 u64 of_node_addr;
106
107 /* Skip if OF node has previously been allocated to a device */
108 list_for_each_entry(of_entry, &mfd_of_node_list, list)
109 if (of_entry->np == np)
110 return -EAGAIN;
111
112 if (!cell->use_of_reg)
113 /* No of_reg defined - allocate first free compatible match */
114 goto allocate_of_node;
115
116 /* We only care about each node's first defined address */
117 if (of_property_read_reg(np, 0, &of_node_addr, NULL))
118 /* OF node does not contatin a 'reg' property to match to */
119 return -EAGAIN;
120
121 if (cell->of_reg != of_node_addr)
122 /* No match */
123 return -EAGAIN;
124
125allocate_of_node:
126 of_entry = kzalloc(sizeof(*of_entry), GFP_KERNEL);
127 if (!of_entry)
128 return -ENOMEM;
129
130 of_entry->dev = &pdev->dev;
131 of_entry->np = np;
132 list_add_tail(&of_entry->list, &mfd_of_node_list);
133
134 device_set_node(&pdev->dev, of_fwnode_handle(np));
135#endif
136 return 0;
137}
138
139static int mfd_add_device(struct device *parent, int id,
140 const struct mfd_cell *cell,
141 struct resource *mem_base,
142 int irq_base, struct irq_domain *domain)
143{
144 struct resource *res;
145 struct platform_device *pdev;
146 struct device_node *np = NULL;
147 struct mfd_of_node_entry *of_entry, *tmp;
148 bool disabled = false;
149 int ret = -ENOMEM;
150 int platform_id;
151 int r;
152
153 if (id == PLATFORM_DEVID_AUTO)
154 platform_id = id;
155 else
156 platform_id = id + cell->id;
157
158 pdev = platform_device_alloc(cell->name, platform_id);
159 if (!pdev)
160 goto fail_alloc;
161
162 pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL);
163 if (!pdev->mfd_cell)
164 goto fail_device;
165
166 res = kcalloc(cell->num_resources, sizeof(*res), GFP_KERNEL);
167 if (!res)
168 goto fail_device;
169
170 pdev->dev.parent = parent;
171 pdev->dev.type = &mfd_dev_type;
172 pdev->dev.dma_mask = parent->dma_mask;
173 pdev->dev.dma_parms = parent->dma_parms;
174 pdev->dev.coherent_dma_mask = parent->coherent_dma_mask;
175
176 ret = regulator_bulk_register_supply_alias(
177 &pdev->dev, cell->parent_supplies,
178 parent, cell->parent_supplies,
179 cell->num_parent_supplies);
180 if (ret < 0)
181 goto fail_res;
182
183 if (IS_ENABLED(CONFIG_OF) && parent->of_node && cell->of_compatible) {
184 for_each_child_of_node(parent->of_node, np) {
185 if (of_device_is_compatible(np, cell->of_compatible)) {
186 /* Skip 'disabled' devices */
187 if (!of_device_is_available(np)) {
188 disabled = true;
189 continue;
190 }
191
192 ret = mfd_match_of_node_to_dev(pdev, np, cell);
193 if (ret == -EAGAIN)
194 continue;
195 of_node_put(np);
196 if (ret)
197 goto fail_alias;
198
199 goto match;
200 }
201 }
202
203 if (disabled) {
204 /* Ignore 'disabled' devices error free */
205 ret = 0;
206 goto fail_alias;
207 }
208
209match:
210 if (!pdev->dev.of_node)
211 pr_warn("%s: Failed to locate of_node [id: %d]\n",
212 cell->name, platform_id);
213 }
214
215 mfd_acpi_add_device(cell, pdev);
216
217 if (cell->pdata_size) {
218 ret = platform_device_add_data(pdev,
219 cell->platform_data, cell->pdata_size);
220 if (ret)
221 goto fail_of_entry;
222 }
223
224 if (cell->swnode) {
225 ret = device_add_software_node(&pdev->dev, cell->swnode);
226 if (ret)
227 goto fail_of_entry;
228 }
229
230 for (r = 0; r < cell->num_resources; r++) {
231 res[r].name = cell->resources[r].name;
232 res[r].flags = cell->resources[r].flags;
233
234 /* Find out base to use */
235 if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) {
236 res[r].parent = mem_base;
237 res[r].start = mem_base->start +
238 cell->resources[r].start;
239 res[r].end = mem_base->start +
240 cell->resources[r].end;
241 } else if (cell->resources[r].flags & IORESOURCE_IRQ) {
242 if (domain) {
243 /* Unable to create mappings for IRQ ranges. */
244 WARN_ON(cell->resources[r].start !=
245 cell->resources[r].end);
246 res[r].start = res[r].end = irq_create_mapping(
247 domain, cell->resources[r].start);
248 } else {
249 res[r].start = irq_base +
250 cell->resources[r].start;
251 res[r].end = irq_base +
252 cell->resources[r].end;
253 }
254 } else {
255 res[r].parent = cell->resources[r].parent;
256 res[r].start = cell->resources[r].start;
257 res[r].end = cell->resources[r].end;
258 }
259
260 if (!cell->ignore_resource_conflicts) {
261 if (has_acpi_companion(&pdev->dev)) {
262 ret = acpi_check_resource_conflict(&res[r]);
263 if (ret)
264 goto fail_res_conflict;
265 }
266 }
267 }
268
269 ret = platform_device_add_resources(pdev, res, cell->num_resources);
270 if (ret)
271 goto fail_res_conflict;
272
273 ret = platform_device_add(pdev);
274 if (ret)
275 goto fail_res_conflict;
276
277 if (cell->pm_runtime_no_callbacks)
278 pm_runtime_no_callbacks(&pdev->dev);
279
280 kfree(res);
281
282 return 0;
283
284fail_res_conflict:
285 if (cell->swnode)
286 device_remove_software_node(&pdev->dev);
287fail_of_entry:
288 list_for_each_entry_safe(of_entry, tmp, &mfd_of_node_list, list)
289 if (of_entry->dev == &pdev->dev) {
290 list_del(&of_entry->list);
291 kfree(of_entry);
292 }
293fail_alias:
294 regulator_bulk_unregister_supply_alias(&pdev->dev,
295 cell->parent_supplies,
296 cell->num_parent_supplies);
297fail_res:
298 kfree(res);
299fail_device:
300 platform_device_put(pdev);
301fail_alloc:
302 return ret;
303}
304
305/**
306 * mfd_add_devices - register child devices
307 *
308 * @parent: Pointer to parent device.
309 * @id: Can be PLATFORM_DEVID_AUTO to let the Platform API take care
310 * of device numbering, or will be added to a device's cell_id.
311 * @cells: Array of (struct mfd_cell)s describing child devices.
312 * @n_devs: Number of child devices to register.
313 * @mem_base: Parent register range resource for child devices.
314 * @irq_base: Base of the range of virtual interrupt numbers allocated for
315 * this MFD device. Unused if @domain is specified.
316 * @domain: Interrupt domain to create mappings for hardware interrupts.
317 */
318int mfd_add_devices(struct device *parent, int id,
319 const struct mfd_cell *cells, int n_devs,
320 struct resource *mem_base,
321 int irq_base, struct irq_domain *domain)
322{
323 int i;
324 int ret;
325
326 for (i = 0; i < n_devs; i++) {
327 ret = mfd_add_device(parent, id, cells + i, mem_base,
328 irq_base, domain);
329 if (ret)
330 goto fail;
331 }
332
333 return 0;
334
335fail:
336 if (i)
337 mfd_remove_devices(parent);
338
339 return ret;
340}
341EXPORT_SYMBOL(mfd_add_devices);
342
343static int mfd_remove_devices_fn(struct device *dev, void *data)
344{
345 struct platform_device *pdev;
346 const struct mfd_cell *cell;
347 struct mfd_of_node_entry *of_entry, *tmp;
348 int *level = data;
349
350 if (dev->type != &mfd_dev_type)
351 return 0;
352
353 pdev = to_platform_device(dev);
354 cell = mfd_get_cell(pdev);
355
356 if (level && cell->level > *level)
357 return 0;
358
359 if (cell->swnode)
360 device_remove_software_node(&pdev->dev);
361
362 list_for_each_entry_safe(of_entry, tmp, &mfd_of_node_list, list)
363 if (of_entry->dev == &pdev->dev) {
364 list_del(&of_entry->list);
365 kfree(of_entry);
366 }
367
368 regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies,
369 cell->num_parent_supplies);
370
371 platform_device_unregister(pdev);
372 return 0;
373}
374
375void mfd_remove_devices_late(struct device *parent)
376{
377 int level = MFD_DEP_LEVEL_HIGH;
378
379 device_for_each_child_reverse(parent, &level, mfd_remove_devices_fn);
380}
381EXPORT_SYMBOL(mfd_remove_devices_late);
382
383void mfd_remove_devices(struct device *parent)
384{
385 int level = MFD_DEP_LEVEL_NORMAL;
386
387 device_for_each_child_reverse(parent, &level, mfd_remove_devices_fn);
388}
389EXPORT_SYMBOL(mfd_remove_devices);
390
391static void devm_mfd_dev_release(struct device *dev, void *res)
392{
393 mfd_remove_devices(dev);
394}
395
396/**
397 * devm_mfd_add_devices - Resource managed version of mfd_add_devices()
398 *
399 * Returns 0 on success or an appropriate negative error number on failure.
400 * All child-devices of the MFD will automatically be removed when it gets
401 * unbinded.
402 *
403 * @dev: Pointer to parent device.
404 * @id: Can be PLATFORM_DEVID_AUTO to let the Platform API take care
405 * of device numbering, or will be added to a device's cell_id.
406 * @cells: Array of (struct mfd_cell)s describing child devices.
407 * @n_devs: Number of child devices to register.
408 * @mem_base: Parent register range resource for child devices.
409 * @irq_base: Base of the range of virtual interrupt numbers allocated for
410 * this MFD device. Unused if @domain is specified.
411 * @domain: Interrupt domain to create mappings for hardware interrupts.
412 */
413int devm_mfd_add_devices(struct device *dev, int id,
414 const struct mfd_cell *cells, int n_devs,
415 struct resource *mem_base,
416 int irq_base, struct irq_domain *domain)
417{
418 struct device **ptr;
419 int ret;
420
421 ptr = devres_alloc(devm_mfd_dev_release, sizeof(*ptr), GFP_KERNEL);
422 if (!ptr)
423 return -ENOMEM;
424
425 ret = mfd_add_devices(dev, id, cells, n_devs, mem_base,
426 irq_base, domain);
427 if (ret < 0) {
428 devres_free(ptr);
429 return ret;
430 }
431
432 *ptr = dev;
433 devres_add(dev, ptr);
434
435 return ret;
436}
437EXPORT_SYMBOL(devm_mfd_add_devices);
438
439MODULE_DESCRIPTION("Core MFD support");
440MODULE_LICENSE("GPL");
441MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");