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 static int mfd_add_device(struct device *parent, int id,
82 const struct mfd_cell *cell, atomic_t *usage_count,
83 struct resource *mem_base,
84 int irq_base, struct irq_domain *domain)
87 struct platform_device *pdev;
88 struct device_node *np = NULL;
92 pdev = platform_device_alloc(cell->name, id + cell->id);
96 res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL);
100 pdev->dev.parent = parent;
101 pdev->dev.type = &mfd_dev_type;
102 pdev->dev.dma_mask = parent->dma_mask;
103 pdev->dev.dma_parms = parent->dma_parms;
105 ret = devm_regulator_bulk_register_supply_alias(
106 &pdev->dev, cell->parent_supplies,
107 parent, cell->parent_supplies,
108 cell->num_parent_supplies);
112 if (parent->of_node && cell->of_compatible) {
113 for_each_child_of_node(parent->of_node, np) {
114 if (of_device_is_compatible(np, cell->of_compatible)) {
115 pdev->dev.of_node = np;
120 if (!pdev->dev.of_node)
121 pdev->dev.of_node = parent->of_node;
123 if (cell->pdata_size) {
124 ret = platform_device_add_data(pdev,
125 cell->platform_data, cell->pdata_size);
130 ret = mfd_platform_add_cell(pdev, cell, usage_count);
134 for (r = 0; r < cell->num_resources; r++) {
135 res[r].name = cell->resources[r].name;
136 res[r].flags = cell->resources[r].flags;
138 /* Find out base to use */
139 if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) {
140 res[r].parent = mem_base;
141 res[r].start = mem_base->start +
142 cell->resources[r].start;
143 res[r].end = mem_base->start +
144 cell->resources[r].end;
145 } else if (cell->resources[r].flags & IORESOURCE_IRQ) {
147 /* Unable to create mappings for IRQ ranges. */
148 WARN_ON(cell->resources[r].start !=
149 cell->resources[r].end);
150 res[r].start = res[r].end = irq_create_mapping(
151 domain, cell->resources[r].start);
153 res[r].start = irq_base +
154 cell->resources[r].start;
155 res[r].end = irq_base +
156 cell->resources[r].end;
159 res[r].parent = cell->resources[r].parent;
160 res[r].start = cell->resources[r].start;
161 res[r].end = cell->resources[r].end;
164 if (!cell->ignore_resource_conflicts) {
165 ret = acpi_check_resource_conflict(&res[r]);
171 ret = platform_device_add_resources(pdev, res, cell->num_resources);
175 ret = platform_device_add(pdev);
179 if (cell->pm_runtime_no_callbacks)
180 pm_runtime_no_callbacks(&pdev->dev);
187 devm_regulator_bulk_unregister_supply_alias(&pdev->dev,
188 cell->parent_supplies,
189 cell->num_parent_supplies);
193 platform_device_put(pdev);
198 int mfd_add_devices(struct device *parent, int id,
199 const struct mfd_cell *cells, int n_devs,
200 struct resource *mem_base,
201 int irq_base, struct irq_domain *domain)
207 /* initialize reference counting for all cells */
208 cnts = kcalloc(n_devs, sizeof(*cnts), GFP_KERNEL);
212 for (i = 0; i < n_devs; i++) {
213 atomic_set(&cnts[i], 0);
214 ret = mfd_add_device(parent, id, cells + i, cnts + i, mem_base,
224 mfd_remove_devices(parent);
229 EXPORT_SYMBOL(mfd_add_devices);
231 static int mfd_remove_devices_fn(struct device *dev, void *c)
233 struct platform_device *pdev;
234 const struct mfd_cell *cell;
235 atomic_t **usage_count = c;
237 if (dev->type != &mfd_dev_type)
240 pdev = to_platform_device(dev);
241 cell = mfd_get_cell(pdev);
243 /* find the base address of usage_count pointers (for freeing) */
244 if (!*usage_count || (cell->usage_count < *usage_count))
245 *usage_count = cell->usage_count;
247 platform_device_unregister(pdev);
251 void mfd_remove_devices(struct device *parent)
253 atomic_t *cnts = NULL;
255 device_for_each_child(parent, &cnts, mfd_remove_devices_fn);
258 EXPORT_SYMBOL(mfd_remove_devices);
260 int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones)
262 struct mfd_cell cell_entry;
264 struct platform_device *pdev;
267 /* fetch the parent cell's device (should already be registered!) */
268 dev = bus_find_device_by_name(&platform_bus_type, NULL, cell);
270 printk(KERN_ERR "failed to find device for cell %s\n", cell);
273 pdev = to_platform_device(dev);
274 memcpy(&cell_entry, mfd_get_cell(pdev), sizeof(cell_entry));
276 WARN_ON(!cell_entry.enable);
278 for (i = 0; i < n_clones; i++) {
279 cell_entry.name = clones[i];
280 /* don't give up if a single call fails; just report error */
281 if (mfd_add_device(pdev->dev.parent, -1, &cell_entry,
282 cell_entry.usage_count, NULL, 0, NULL))
283 dev_err(dev, "failed to create platform device '%s'\n",
289 EXPORT_SYMBOL(mfd_clone_cell);
291 MODULE_LICENSE("GPL");
292 MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");