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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/property.h>
14#include <linux/mfd/core.h>
15#include <linux/pm_runtime.h>
16#include <linux/slab.h>
17#include <linux/module.h>
18#include <linux/irqdomain.h>
19#include <linux/of.h>
20#include <linux/regulator/consumer.h>
21
22static struct device_type mfd_dev_type = {
23 .name = "mfd_device",
24};
25
26int mfd_cell_enable(struct platform_device *pdev)
27{
28 const struct mfd_cell *cell = mfd_get_cell(pdev);
29 int err = 0;
30
31 /* only call enable hook if the cell wasn't previously enabled */
32 if (atomic_inc_return(cell->usage_count) == 1)
33 err = cell->enable(pdev);
34
35 /* if the enable hook failed, decrement counter to allow retries */
36 if (err)
37 atomic_dec(cell->usage_count);
38
39 return err;
40}
41EXPORT_SYMBOL(mfd_cell_enable);
42
43int mfd_cell_disable(struct platform_device *pdev)
44{
45 const struct mfd_cell *cell = mfd_get_cell(pdev);
46 int err = 0;
47
48 /* only disable if no other clients are using it */
49 if (atomic_dec_return(cell->usage_count) == 0)
50 err = cell->disable(pdev);
51
52 /* if the disable hook failed, increment to allow retries */
53 if (err)
54 atomic_inc(cell->usage_count);
55
56 /* sanity check; did someone call disable too many times? */
57 WARN_ON(atomic_read(cell->usage_count) < 0);
58
59 return err;
60}
61EXPORT_SYMBOL(mfd_cell_disable);
62
63static int mfd_platform_add_cell(struct platform_device *pdev,
64 const struct mfd_cell *cell,
65 atomic_t *usage_count)
66{
67 if (!cell)
68 return 0;
69
70 pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL);
71 if (!pdev->mfd_cell)
72 return -ENOMEM;
73
74 pdev->mfd_cell->usage_count = usage_count;
75 return 0;
76}
77
78#if IS_ENABLED(CONFIG_ACPI)
79static void mfd_acpi_add_device(const struct mfd_cell *cell,
80 struct platform_device *pdev)
81{
82 const struct mfd_cell_acpi_match *match = cell->acpi_match;
83 struct acpi_device *parent, *child;
84 struct acpi_device *adev;
85
86 parent = ACPI_COMPANION(pdev->dev.parent);
87 if (!parent)
88 return;
89
90 /*
91 * MFD child device gets its ACPI handle either from the ACPI device
92 * directly under the parent that matches the either _HID or _CID, or
93 * _ADR or it will use the parent handle if is no ID is given.
94 *
95 * Note that use of _ADR is a grey area in the ACPI specification,
96 * though Intel Galileo Gen2 is using it to distinguish the children
97 * devices.
98 */
99 adev = parent;
100 if (match) {
101 if (match->pnpid) {
102 struct acpi_device_id ids[2] = {};
103
104 strlcpy(ids[0].id, match->pnpid, sizeof(ids[0].id));
105 list_for_each_entry(child, &parent->children, node) {
106 if (!acpi_match_device_ids(child, ids)) {
107 adev = child;
108 break;
109 }
110 }
111 } else {
112 unsigned long long adr;
113 acpi_status status;
114
115 list_for_each_entry(child, &parent->children, node) {
116 status = acpi_evaluate_integer(child->handle,
117 "_ADR", NULL,
118 &adr);
119 if (ACPI_SUCCESS(status) && match->adr == adr) {
120 adev = child;
121 break;
122 }
123 }
124 }
125 }
126
127 ACPI_COMPANION_SET(&pdev->dev, adev);
128}
129#else
130static inline void mfd_acpi_add_device(const struct mfd_cell *cell,
131 struct platform_device *pdev)
132{
133}
134#endif
135
136static int mfd_add_device(struct device *parent, int id,
137 const struct mfd_cell *cell, atomic_t *usage_count,
138 struct resource *mem_base,
139 int irq_base, struct irq_domain *domain)
140{
141 struct resource *res;
142 struct platform_device *pdev;
143 struct device_node *np = NULL;
144 int ret = -ENOMEM;
145 int platform_id;
146 int r;
147
148 if (id == PLATFORM_DEVID_AUTO)
149 platform_id = id;
150 else
151 platform_id = id + cell->id;
152
153 pdev = platform_device_alloc(cell->name, platform_id);
154 if (!pdev)
155 goto fail_alloc;
156
157 res = kcalloc(cell->num_resources, sizeof(*res), GFP_KERNEL);
158 if (!res)
159 goto fail_device;
160
161 pdev->dev.parent = parent;
162 pdev->dev.type = &mfd_dev_type;
163 pdev->dev.dma_mask = parent->dma_mask;
164 pdev->dev.dma_parms = parent->dma_parms;
165 pdev->dev.coherent_dma_mask = parent->coherent_dma_mask;
166
167 ret = regulator_bulk_register_supply_alias(
168 &pdev->dev, cell->parent_supplies,
169 parent, cell->parent_supplies,
170 cell->num_parent_supplies);
171 if (ret < 0)
172 goto fail_res;
173
174 if (parent->of_node && cell->of_compatible) {
175 for_each_child_of_node(parent->of_node, np) {
176 if (of_device_is_compatible(np, cell->of_compatible)) {
177 pdev->dev.of_node = np;
178 pdev->dev.fwnode = &np->fwnode;
179 break;
180 }
181 }
182 }
183
184 mfd_acpi_add_device(cell, pdev);
185
186 if (cell->pdata_size) {
187 ret = platform_device_add_data(pdev,
188 cell->platform_data, cell->pdata_size);
189 if (ret)
190 goto fail_alias;
191 }
192
193 if (cell->properties) {
194 ret = platform_device_add_properties(pdev, cell->properties);
195 if (ret)
196 goto fail_alias;
197 }
198
199 ret = mfd_platform_add_cell(pdev, cell, usage_count);
200 if (ret)
201 goto fail_alias;
202
203 for (r = 0; r < cell->num_resources; r++) {
204 res[r].name = cell->resources[r].name;
205 res[r].flags = cell->resources[r].flags;
206
207 /* Find out base to use */
208 if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) {
209 res[r].parent = mem_base;
210 res[r].start = mem_base->start +
211 cell->resources[r].start;
212 res[r].end = mem_base->start +
213 cell->resources[r].end;
214 } else if (cell->resources[r].flags & IORESOURCE_IRQ) {
215 if (domain) {
216 /* Unable to create mappings for IRQ ranges. */
217 WARN_ON(cell->resources[r].start !=
218 cell->resources[r].end);
219 res[r].start = res[r].end = irq_create_mapping(
220 domain, cell->resources[r].start);
221 } else {
222 res[r].start = irq_base +
223 cell->resources[r].start;
224 res[r].end = irq_base +
225 cell->resources[r].end;
226 }
227 } else {
228 res[r].parent = cell->resources[r].parent;
229 res[r].start = cell->resources[r].start;
230 res[r].end = cell->resources[r].end;
231 }
232
233 if (!cell->ignore_resource_conflicts) {
234 if (has_acpi_companion(&pdev->dev)) {
235 ret = acpi_check_resource_conflict(&res[r]);
236 if (ret)
237 goto fail_alias;
238 }
239 }
240 }
241
242 ret = platform_device_add_resources(pdev, res, cell->num_resources);
243 if (ret)
244 goto fail_alias;
245
246 ret = platform_device_add(pdev);
247 if (ret)
248 goto fail_alias;
249
250 if (cell->pm_runtime_no_callbacks)
251 pm_runtime_no_callbacks(&pdev->dev);
252
253 kfree(res);
254
255 return 0;
256
257fail_alias:
258 regulator_bulk_unregister_supply_alias(&pdev->dev,
259 cell->parent_supplies,
260 cell->num_parent_supplies);
261fail_res:
262 kfree(res);
263fail_device:
264 platform_device_put(pdev);
265fail_alloc:
266 return ret;
267}
268
269/**
270 * mfd_add_devices - register child devices
271 *
272 * @parent: Pointer to parent device.
273 * @id: Can be PLATFORM_DEVID_AUTO to let the Platform API take care
274 * of device numbering, or will be added to a device's cell_id.
275 * @cells: Array of (struct mfd_cell)s describing child devices.
276 * @n_devs: Number of child devices to register.
277 * @mem_base: Parent register range resource for child devices.
278 * @irq_base: Base of the range of virtual interrupt numbers allocated for
279 * this MFD device. Unused if @domain is specified.
280 * @domain: Interrupt domain to create mappings for hardware interrupts.
281 */
282int mfd_add_devices(struct device *parent, int id,
283 const struct mfd_cell *cells, int n_devs,
284 struct resource *mem_base,
285 int irq_base, struct irq_domain *domain)
286{
287 int i;
288 int ret;
289 atomic_t *cnts;
290
291 /* initialize reference counting for all cells */
292 cnts = kcalloc(n_devs, sizeof(*cnts), GFP_KERNEL);
293 if (!cnts)
294 return -ENOMEM;
295
296 for (i = 0; i < n_devs; i++) {
297 atomic_set(&cnts[i], 0);
298 ret = mfd_add_device(parent, id, cells + i, cnts + i, mem_base,
299 irq_base, domain);
300 if (ret)
301 goto fail;
302 }
303
304 return 0;
305
306fail:
307 if (i)
308 mfd_remove_devices(parent);
309 else
310 kfree(cnts);
311 return ret;
312}
313EXPORT_SYMBOL(mfd_add_devices);
314
315static int mfd_remove_devices_fn(struct device *dev, void *c)
316{
317 struct platform_device *pdev;
318 const struct mfd_cell *cell;
319 atomic_t **usage_count = c;
320
321 if (dev->type != &mfd_dev_type)
322 return 0;
323
324 pdev = to_platform_device(dev);
325 cell = mfd_get_cell(pdev);
326
327 regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies,
328 cell->num_parent_supplies);
329
330 /* find the base address of usage_count pointers (for freeing) */
331 if (!*usage_count || (cell->usage_count < *usage_count))
332 *usage_count = cell->usage_count;
333
334 platform_device_unregister(pdev);
335 return 0;
336}
337
338void mfd_remove_devices(struct device *parent)
339{
340 atomic_t *cnts = NULL;
341
342 device_for_each_child_reverse(parent, &cnts, mfd_remove_devices_fn);
343 kfree(cnts);
344}
345EXPORT_SYMBOL(mfd_remove_devices);
346
347static void devm_mfd_dev_release(struct device *dev, void *res)
348{
349 mfd_remove_devices(dev);
350}
351
352/**
353 * devm_mfd_add_devices - Resource managed version of mfd_add_devices()
354 *
355 * Returns 0 on success or an appropriate negative error number on failure.
356 * All child-devices of the MFD will automatically be removed when it gets
357 * unbinded.
358 */
359int devm_mfd_add_devices(struct device *dev, int id,
360 const struct mfd_cell *cells, int n_devs,
361 struct resource *mem_base,
362 int irq_base, struct irq_domain *domain)
363{
364 struct device **ptr;
365 int ret;
366
367 ptr = devres_alloc(devm_mfd_dev_release, sizeof(*ptr), GFP_KERNEL);
368 if (!ptr)
369 return -ENOMEM;
370
371 ret = mfd_add_devices(dev, id, cells, n_devs, mem_base,
372 irq_base, domain);
373 if (ret < 0) {
374 devres_free(ptr);
375 return ret;
376 }
377
378 *ptr = dev;
379 devres_add(dev, ptr);
380
381 return ret;
382}
383EXPORT_SYMBOL(devm_mfd_add_devices);
384
385int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones)
386{
387 struct mfd_cell cell_entry;
388 struct device *dev;
389 struct platform_device *pdev;
390 int i;
391
392 /* fetch the parent cell's device (should already be registered!) */
393 dev = bus_find_device_by_name(&platform_bus_type, NULL, cell);
394 if (!dev) {
395 printk(KERN_ERR "failed to find device for cell %s\n", cell);
396 return -ENODEV;
397 }
398 pdev = to_platform_device(dev);
399 memcpy(&cell_entry, mfd_get_cell(pdev), sizeof(cell_entry));
400
401 WARN_ON(!cell_entry.enable);
402
403 for (i = 0; i < n_clones; i++) {
404 cell_entry.name = clones[i];
405 /* don't give up if a single call fails; just report error */
406 if (mfd_add_device(pdev->dev.parent, -1, &cell_entry,
407 cell_entry.usage_count, NULL, 0, NULL))
408 dev_err(dev, "failed to create platform device '%s'\n",
409 clones[i]);
410 }
411
412 put_device(dev);
413
414 return 0;
415}
416EXPORT_SYMBOL(mfd_clone_cell);
417
418MODULE_LICENSE("GPL");
419MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");