2 * drivers/mfd/mfd-core.c
5 * Copyright (c) 2006 Ian Molton
6 * Copyright (c) 2007,2008 Dmitry Baryshkov
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.
14 #include <linux/kernel.h>
15 #include <linux/platform_device.h>
16 #include <linux/acpi.h>
17 #include <linux/mfd/core.h>
18 #include <linux/pm_runtime.h>
19 #include <linux/slab.h>
20 #include <linux/module.h>
21 #include <linux/irqdomain.h>
23 #include <linux/regulator/consumer.h>
25 static struct device_type mfd_dev_type = {
29 int mfd_cell_enable(struct platform_device *pdev)
31 const struct mfd_cell *cell = mfd_get_cell(pdev);
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);
38 /* if the enable hook failed, decrement counter to allow retries */
40 atomic_dec(cell->usage_count);
44 EXPORT_SYMBOL(mfd_cell_enable);
46 int mfd_cell_disable(struct platform_device *pdev)
48 const struct mfd_cell *cell = mfd_get_cell(pdev);
51 /* only disable if no other clients are using it */
52 if (atomic_dec_return(cell->usage_count) == 0)
53 err = cell->disable(pdev);
55 /* if the disable hook failed, increment to allow retries */
57 atomic_inc(cell->usage_count);
59 /* sanity check; did someone call disable too many times? */
60 WARN_ON(atomic_read(cell->usage_count) < 0);
64 EXPORT_SYMBOL(mfd_cell_disable);
66 static int mfd_platform_add_cell(struct platform_device *pdev,
67 const struct mfd_cell *cell,
68 atomic_t *usage_count)
73 pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL);
77 pdev->mfd_cell->usage_count = usage_count;
81 #if IS_ENABLED(CONFIG_ACPI)
82 static void mfd_acpi_add_device(const struct mfd_cell *cell,
83 struct platform_device *pdev)
85 struct acpi_device *parent_adev;
86 struct acpi_device *adev;
88 parent_adev = ACPI_COMPANION(pdev->dev.parent);
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.
98 if (cell->acpi_pnpid) {
99 struct acpi_device_id ids[2] = {};
100 struct acpi_device *child_adev;
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)) {
110 ACPI_COMPANION_SET(&pdev->dev, adev);
113 static inline void mfd_acpi_add_device(const struct mfd_cell *cell,
114 struct platform_device *pdev)
119 static int mfd_add_device(struct device *parent, int id,
120 const struct mfd_cell *cell, atomic_t *usage_count,
121 struct resource *mem_base,
122 int irq_base, struct irq_domain *domain)
124 struct resource *res;
125 struct platform_device *pdev;
126 struct device_node *np = NULL;
130 pdev = platform_device_alloc(cell->name, id + cell->id);
134 res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL);
138 pdev->dev.parent = parent;
139 pdev->dev.type = &mfd_dev_type;
140 pdev->dev.dma_mask = parent->dma_mask;
141 pdev->dev.dma_parms = parent->dma_parms;
142 pdev->dev.coherent_dma_mask = parent->coherent_dma_mask;
144 ret = regulator_bulk_register_supply_alias(
145 &pdev->dev, cell->parent_supplies,
146 parent, cell->parent_supplies,
147 cell->num_parent_supplies);
151 if (parent->of_node && cell->of_compatible) {
152 for_each_child_of_node(parent->of_node, np) {
153 if (of_device_is_compatible(np, cell->of_compatible)) {
154 pdev->dev.of_node = np;
160 mfd_acpi_add_device(cell, pdev);
162 if (cell->pdata_size) {
163 ret = platform_device_add_data(pdev,
164 cell->platform_data, cell->pdata_size);
169 ret = mfd_platform_add_cell(pdev, cell, usage_count);
173 for (r = 0; r < cell->num_resources; r++) {
174 res[r].name = cell->resources[r].name;
175 res[r].flags = cell->resources[r].flags;
177 /* Find out base to use */
178 if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) {
179 res[r].parent = mem_base;
180 res[r].start = mem_base->start +
181 cell->resources[r].start;
182 res[r].end = mem_base->start +
183 cell->resources[r].end;
184 } else if (cell->resources[r].flags & IORESOURCE_IRQ) {
186 /* Unable to create mappings for IRQ ranges. */
187 WARN_ON(cell->resources[r].start !=
188 cell->resources[r].end);
189 res[r].start = res[r].end = irq_create_mapping(
190 domain, cell->resources[r].start);
192 res[r].start = irq_base +
193 cell->resources[r].start;
194 res[r].end = irq_base +
195 cell->resources[r].end;
198 res[r].parent = cell->resources[r].parent;
199 res[r].start = cell->resources[r].start;
200 res[r].end = cell->resources[r].end;
203 if (!cell->ignore_resource_conflicts) {
204 ret = acpi_check_resource_conflict(&res[r]);
210 ret = platform_device_add_resources(pdev, res, cell->num_resources);
214 ret = platform_device_add(pdev);
218 if (cell->pm_runtime_no_callbacks)
219 pm_runtime_no_callbacks(&pdev->dev);
226 regulator_bulk_unregister_supply_alias(&pdev->dev,
227 cell->parent_supplies,
228 cell->num_parent_supplies);
232 platform_device_put(pdev);
237 int mfd_add_devices(struct device *parent, int id,
238 const struct mfd_cell *cells, int n_devs,
239 struct resource *mem_base,
240 int irq_base, struct irq_domain *domain)
246 /* initialize reference counting for all cells */
247 cnts = kcalloc(n_devs, sizeof(*cnts), GFP_KERNEL);
251 for (i = 0; i < n_devs; i++) {
252 atomic_set(&cnts[i], 0);
253 ret = mfd_add_device(parent, id, cells + i, cnts + i, mem_base,
263 mfd_remove_devices(parent);
268 EXPORT_SYMBOL(mfd_add_devices);
270 static int mfd_remove_devices_fn(struct device *dev, void *c)
272 struct platform_device *pdev;
273 const struct mfd_cell *cell;
274 atomic_t **usage_count = c;
276 if (dev->type != &mfd_dev_type)
279 pdev = to_platform_device(dev);
280 cell = mfd_get_cell(pdev);
282 regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies,
283 cell->num_parent_supplies);
285 /* find the base address of usage_count pointers (for freeing) */
286 if (!*usage_count || (cell->usage_count < *usage_count))
287 *usage_count = cell->usage_count;
289 platform_device_unregister(pdev);
293 void mfd_remove_devices(struct device *parent)
295 atomic_t *cnts = NULL;
297 device_for_each_child(parent, &cnts, mfd_remove_devices_fn);
300 EXPORT_SYMBOL(mfd_remove_devices);
302 int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones)
304 struct mfd_cell cell_entry;
306 struct platform_device *pdev;
309 /* fetch the parent cell's device (should already be registered!) */
310 dev = bus_find_device_by_name(&platform_bus_type, NULL, cell);
312 printk(KERN_ERR "failed to find device for cell %s\n", cell);
315 pdev = to_platform_device(dev);
316 memcpy(&cell_entry, mfd_get_cell(pdev), sizeof(cell_entry));
318 WARN_ON(!cell_entry.enable);
320 for (i = 0; i < n_clones; i++) {
321 cell_entry.name = clones[i];
322 /* don't give up if a single call fails; just report error */
323 if (mfd_add_device(pdev->dev.parent, -1, &cell_entry,
324 cell_entry.usage_count, NULL, 0, NULL))
325 dev_err(dev, "failed to create platform device '%s'\n",
331 EXPORT_SYMBOL(mfd_clone_cell);
333 MODULE_LICENSE("GPL");
334 MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");