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-rw-r--r--kernel/drivers/mfd/mfd-core.c340
1 files changed, 340 insertions, 0 deletions
diff --git a/kernel/drivers/mfd/mfd-core.c b/kernel/drivers/mfd/mfd-core.c
new file mode 100644
index 000000000..1aed3b7b8
--- /dev/null
+++ b/kernel/drivers/mfd/mfd-core.c
@@ -0,0 +1,340 @@
+/*
+ * drivers/mfd/mfd-core.c
+ *
+ * core MFD support
+ * Copyright (c) 2006 Ian Molton
+ * Copyright (c) 2007,2008 Dmitry Baryshkov
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/acpi.h>
+#include <linux/mfd/core.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/irqdomain.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+
+static struct device_type mfd_dev_type = {
+ .name = "mfd_device",
+};
+
+int mfd_cell_enable(struct platform_device *pdev)
+{
+ const struct mfd_cell *cell = mfd_get_cell(pdev);
+ int err = 0;
+
+ /* only call enable hook if the cell wasn't previously enabled */
+ if (atomic_inc_return(cell->usage_count) == 1)
+ err = cell->enable(pdev);
+
+ /* if the enable hook failed, decrement counter to allow retries */
+ if (err)
+ atomic_dec(cell->usage_count);
+
+ return err;
+}
+EXPORT_SYMBOL(mfd_cell_enable);
+
+int mfd_cell_disable(struct platform_device *pdev)
+{
+ const struct mfd_cell *cell = mfd_get_cell(pdev);
+ int err = 0;
+
+ /* only disable if no other clients are using it */
+ if (atomic_dec_return(cell->usage_count) == 0)
+ err = cell->disable(pdev);
+
+ /* if the disable hook failed, increment to allow retries */
+ if (err)
+ atomic_inc(cell->usage_count);
+
+ /* sanity check; did someone call disable too many times? */
+ WARN_ON(atomic_read(cell->usage_count) < 0);
+
+ return err;
+}
+EXPORT_SYMBOL(mfd_cell_disable);
+
+static int mfd_platform_add_cell(struct platform_device *pdev,
+ const struct mfd_cell *cell,
+ atomic_t *usage_count)
+{
+ if (!cell)
+ return 0;
+
+ pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL);
+ if (!pdev->mfd_cell)
+ return -ENOMEM;
+
+ pdev->mfd_cell->usage_count = usage_count;
+ return 0;
+}
+
+#if IS_ENABLED(CONFIG_ACPI)
+static void mfd_acpi_add_device(const struct mfd_cell *cell,
+ struct platform_device *pdev)
+{
+ struct acpi_device *parent_adev;
+ struct acpi_device *adev;
+
+ parent_adev = ACPI_COMPANION(pdev->dev.parent);
+ if (!parent_adev)
+ return;
+
+ /*
+ * MFD child device gets its ACPI handle either from the ACPI
+ * device directly under the parent that matches the acpi_pnpid or
+ * it will use the parent handle if is no acpi_pnpid is given.
+ */
+ adev = parent_adev;
+ if (cell->acpi_pnpid) {
+ struct acpi_device_id ids[2] = {};
+ struct acpi_device *child_adev;
+
+ strlcpy(ids[0].id, cell->acpi_pnpid, sizeof(ids[0].id));
+ list_for_each_entry(child_adev, &parent_adev->children, node)
+ if (acpi_match_device_ids(child_adev, ids)) {
+ adev = child_adev;
+ break;
+ }
+ }
+
+ ACPI_COMPANION_SET(&pdev->dev, adev);
+}
+#else
+static inline void mfd_acpi_add_device(const struct mfd_cell *cell,
+ struct platform_device *pdev)
+{
+}
+#endif
+
+static int mfd_add_device(struct device *parent, int id,
+ const struct mfd_cell *cell, atomic_t *usage_count,
+ struct resource *mem_base,
+ int irq_base, struct irq_domain *domain)
+{
+ struct resource *res;
+ struct platform_device *pdev;
+ struct device_node *np = NULL;
+ int ret = -ENOMEM;
+ int platform_id;
+ int r;
+
+ if (id == PLATFORM_DEVID_AUTO)
+ platform_id = id;
+ else
+ platform_id = id + cell->id;
+
+ pdev = platform_device_alloc(cell->name, platform_id);
+ if (!pdev)
+ goto fail_alloc;
+
+ res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL);
+ if (!res)
+ goto fail_device;
+
+ pdev->dev.parent = parent;
+ pdev->dev.type = &mfd_dev_type;
+ pdev->dev.dma_mask = parent->dma_mask;
+ pdev->dev.dma_parms = parent->dma_parms;
+ pdev->dev.coherent_dma_mask = parent->coherent_dma_mask;
+
+ ret = regulator_bulk_register_supply_alias(
+ &pdev->dev, cell->parent_supplies,
+ parent, cell->parent_supplies,
+ cell->num_parent_supplies);
+ if (ret < 0)
+ goto fail_res;
+
+ if (parent->of_node && cell->of_compatible) {
+ for_each_child_of_node(parent->of_node, np) {
+ if (of_device_is_compatible(np, cell->of_compatible)) {
+ pdev->dev.of_node = np;
+ break;
+ }
+ }
+ }
+
+ mfd_acpi_add_device(cell, pdev);
+
+ if (cell->pdata_size) {
+ ret = platform_device_add_data(pdev,
+ cell->platform_data, cell->pdata_size);
+ if (ret)
+ goto fail_alias;
+ }
+
+ ret = mfd_platform_add_cell(pdev, cell, usage_count);
+ if (ret)
+ goto fail_alias;
+
+ for (r = 0; r < cell->num_resources; r++) {
+ res[r].name = cell->resources[r].name;
+ res[r].flags = cell->resources[r].flags;
+
+ /* Find out base to use */
+ if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) {
+ res[r].parent = mem_base;
+ res[r].start = mem_base->start +
+ cell->resources[r].start;
+ res[r].end = mem_base->start +
+ cell->resources[r].end;
+ } else if (cell->resources[r].flags & IORESOURCE_IRQ) {
+ if (domain) {
+ /* Unable to create mappings for IRQ ranges. */
+ WARN_ON(cell->resources[r].start !=
+ cell->resources[r].end);
+ res[r].start = res[r].end = irq_create_mapping(
+ domain, cell->resources[r].start);
+ } else {
+ res[r].start = irq_base +
+ cell->resources[r].start;
+ res[r].end = irq_base +
+ cell->resources[r].end;
+ }
+ } else {
+ res[r].parent = cell->resources[r].parent;
+ res[r].start = cell->resources[r].start;
+ res[r].end = cell->resources[r].end;
+ }
+
+ if (!cell->ignore_resource_conflicts) {
+ ret = acpi_check_resource_conflict(&res[r]);
+ if (ret)
+ goto fail_alias;
+ }
+ }
+
+ ret = platform_device_add_resources(pdev, res, cell->num_resources);
+ if (ret)
+ goto fail_alias;
+
+ ret = platform_device_add(pdev);
+ if (ret)
+ goto fail_alias;
+
+ if (cell->pm_runtime_no_callbacks)
+ pm_runtime_no_callbacks(&pdev->dev);
+
+ kfree(res);
+
+ return 0;
+
+fail_alias:
+ regulator_bulk_unregister_supply_alias(&pdev->dev,
+ cell->parent_supplies,
+ cell->num_parent_supplies);
+fail_res:
+ kfree(res);
+fail_device:
+ platform_device_put(pdev);
+fail_alloc:
+ return ret;
+}
+
+int mfd_add_devices(struct device *parent, int id,
+ const struct mfd_cell *cells, int n_devs,
+ struct resource *mem_base,
+ int irq_base, struct irq_domain *domain)
+{
+ int i;
+ int ret;
+ atomic_t *cnts;
+
+ /* initialize reference counting for all cells */
+ cnts = kcalloc(n_devs, sizeof(*cnts), GFP_KERNEL);
+ if (!cnts)
+ return -ENOMEM;
+
+ for (i = 0; i < n_devs; i++) {
+ atomic_set(&cnts[i], 0);
+ ret = mfd_add_device(parent, id, cells + i, cnts + i, mem_base,
+ irq_base, domain);
+ if (ret)
+ goto fail;
+ }
+
+ return 0;
+
+fail:
+ if (i)
+ mfd_remove_devices(parent);
+ else
+ kfree(cnts);
+ return ret;
+}
+EXPORT_SYMBOL(mfd_add_devices);
+
+static int mfd_remove_devices_fn(struct device *dev, void *c)
+{
+ struct platform_device *pdev;
+ const struct mfd_cell *cell;
+ atomic_t **usage_count = c;
+
+ if (dev->type != &mfd_dev_type)
+ return 0;
+
+ pdev = to_platform_device(dev);
+ cell = mfd_get_cell(pdev);
+
+ regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies,
+ cell->num_parent_supplies);
+
+ /* find the base address of usage_count pointers (for freeing) */
+ if (!*usage_count || (cell->usage_count < *usage_count))
+ *usage_count = cell->usage_count;
+
+ platform_device_unregister(pdev);
+ return 0;
+}
+
+void mfd_remove_devices(struct device *parent)
+{
+ atomic_t *cnts = NULL;
+
+ device_for_each_child(parent, &cnts, mfd_remove_devices_fn);
+ kfree(cnts);
+}
+EXPORT_SYMBOL(mfd_remove_devices);
+
+int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones)
+{
+ struct mfd_cell cell_entry;
+ struct device *dev;
+ struct platform_device *pdev;
+ int i;
+
+ /* fetch the parent cell's device (should already be registered!) */
+ dev = bus_find_device_by_name(&platform_bus_type, NULL, cell);
+ if (!dev) {
+ printk(KERN_ERR "failed to find device for cell %s\n", cell);
+ return -ENODEV;
+ }
+ pdev = to_platform_device(dev);
+ memcpy(&cell_entry, mfd_get_cell(pdev), sizeof(cell_entry));
+
+ WARN_ON(!cell_entry.enable);
+
+ for (i = 0; i < n_clones; i++) {
+ cell_entry.name = clones[i];
+ /* don't give up if a single call fails; just report error */
+ if (mfd_add_device(pdev->dev.parent, -1, &cell_entry,
+ cell_entry.usage_count, NULL, 0, NULL))
+ dev_err(dev, "failed to create platform device '%s'\n",
+ clones[i]);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(mfd_clone_cell);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");