diff options
Diffstat (limited to 'drivers/nvmem/core.c')
| -rw-r--r-- | drivers/nvmem/core.c | 533 |
1 files changed, 358 insertions, 175 deletions
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index aa1657831b70..9b18ce90f907 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -1,17 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0 /* * nvmem framework core. * * Copyright (C) 2015 Srinivas Kandagatla <srinivas.kandagatla@linaro.org> * Copyright (C) 2013 Maxime Ripard <maxime.ripard@free-electrons.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 and - * only version 2 as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. */ #include <linux/device.h> @@ -19,6 +11,7 @@ #include <linux/fs.h> #include <linux/idr.h> #include <linux/init.h> +#include <linux/kref.h> #include <linux/module.h> #include <linux/nvmem-consumer.h> #include <linux/nvmem-provider.h> @@ -26,18 +19,18 @@ #include <linux/slab.h> struct nvmem_device { - const char *name; struct module *owner; struct device dev; int stride; int word_size; int id; - int users; + struct kref refcnt; size_t size; bool read_only; int flags; struct bin_attribute eeprom; struct device *base_dev; + struct list_head cells; nvmem_reg_read_t reg_read; nvmem_reg_write_t reg_write; void *priv; @@ -58,8 +51,13 @@ struct nvmem_cell { static DEFINE_MUTEX(nvmem_mutex); static DEFINE_IDA(nvmem_ida); -static LIST_HEAD(nvmem_cells); -static DEFINE_MUTEX(nvmem_cells_mutex); +static DEFINE_MUTEX(nvmem_cell_mutex); +static LIST_HEAD(nvmem_cell_tables); + +static DEFINE_MUTEX(nvmem_lookup_mutex); +static LIST_HEAD(nvmem_lookup_list); + +static BLOCKING_NOTIFIER_HEAD(nvmem_notifier); #ifdef CONFIG_DEBUG_LOCK_ALLOC static struct lock_class_key eeprom_lock_key; @@ -156,7 +154,7 @@ static ssize_t bin_attr_nvmem_write(struct file *filp, struct kobject *kobj, static struct bin_attribute bin_attr_rw_nvmem = { .attr = { .name = "nvmem", - .mode = S_IWUSR | S_IRUGO, + .mode = 0644, }, .read = bin_attr_nvmem_read, .write = bin_attr_nvmem_write, @@ -180,7 +178,7 @@ static const struct attribute_group *nvmem_rw_dev_groups[] = { static struct bin_attribute bin_attr_ro_nvmem = { .attr = { .name = "nvmem", - .mode = S_IRUGO, + .mode = 0444, }, .read = bin_attr_nvmem_read, }; @@ -203,7 +201,7 @@ static const struct attribute_group *nvmem_ro_dev_groups[] = { static struct bin_attribute bin_attr_rw_root_nvmem = { .attr = { .name = "nvmem", - .mode = S_IWUSR | S_IRUSR, + .mode = 0600, }, .read = bin_attr_nvmem_read, .write = bin_attr_nvmem_write, @@ -227,7 +225,7 @@ static const struct attribute_group *nvmem_rw_root_dev_groups[] = { static struct bin_attribute bin_attr_ro_root_nvmem = { .attr = { .name = "nvmem", - .mode = S_IRUSR, + .mode = 0400, }, .read = bin_attr_nvmem_read, }; @@ -282,48 +280,42 @@ static struct nvmem_device *of_nvmem_find(struct device_node *nvmem_np) return to_nvmem_device(d); } -static struct nvmem_cell *nvmem_find_cell(const char *cell_id) +static struct nvmem_device *nvmem_find(const char *name) { - struct nvmem_cell *p; - - mutex_lock(&nvmem_cells_mutex); + struct device *d; - list_for_each_entry(p, &nvmem_cells, node) - if (!strcmp(p->name, cell_id)) { - mutex_unlock(&nvmem_cells_mutex); - return p; - } + d = bus_find_device_by_name(&nvmem_bus_type, NULL, name); - mutex_unlock(&nvmem_cells_mutex); + if (!d) + return NULL; - return NULL; + return to_nvmem_device(d); } static void nvmem_cell_drop(struct nvmem_cell *cell) { - mutex_lock(&nvmem_cells_mutex); + blocking_notifier_call_chain(&nvmem_notifier, NVMEM_CELL_REMOVE, cell); + mutex_lock(&nvmem_mutex); list_del(&cell->node); - mutex_unlock(&nvmem_cells_mutex); + mutex_unlock(&nvmem_mutex); + kfree(cell->name); kfree(cell); } static void nvmem_device_remove_all_cells(const struct nvmem_device *nvmem) { - struct nvmem_cell *cell; - struct list_head *p, *n; + struct nvmem_cell *cell, *p; - list_for_each_safe(p, n, &nvmem_cells) { - cell = list_entry(p, struct nvmem_cell, node); - if (cell->nvmem == nvmem) - nvmem_cell_drop(cell); - } + list_for_each_entry_safe(cell, p, &nvmem->cells, node) + nvmem_cell_drop(cell); } static void nvmem_cell_add(struct nvmem_cell *cell) { - mutex_lock(&nvmem_cells_mutex); - list_add_tail(&cell->node, &nvmem_cells); - mutex_unlock(&nvmem_cells_mutex); + mutex_lock(&nvmem_mutex); + list_add_tail(&cell->node, &cell->nvmem->cells); + mutex_unlock(&nvmem_mutex); + blocking_notifier_call_chain(&nvmem_notifier, NVMEM_CELL_ADD, cell); } static int nvmem_cell_info_to_nvmem_cell(struct nvmem_device *nvmem, @@ -361,7 +353,7 @@ static int nvmem_cell_info_to_nvmem_cell(struct nvmem_device *nvmem, * * Return: 0 or negative error code on failure. */ -int nvmem_add_cells(struct nvmem_device *nvmem, +static int nvmem_add_cells(struct nvmem_device *nvmem, const struct nvmem_cell_info *info, int ncells) { @@ -400,7 +392,6 @@ err: return rval; } -EXPORT_SYMBOL_GPL(nvmem_add_cells); /* * nvmem_setup_compat() - Create an additional binary entry in @@ -440,6 +431,136 @@ static int nvmem_setup_compat(struct nvmem_device *nvmem, } /** + * nvmem_register_notifier() - Register a notifier block for nvmem events. + * + * @nb: notifier block to be called on nvmem events. + * + * Return: 0 on success, negative error number on failure. + */ +int nvmem_register_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_register(&nvmem_notifier, nb); +} +EXPORT_SYMBOL_GPL(nvmem_register_notifier); + +/** + * nvmem_unregister_notifier() - Unregister a notifier block for nvmem events. + * + * @nb: notifier block to be unregistered. + * + * Return: 0 on success, negative error number on failure. + */ +int nvmem_unregister_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_unregister(&nvmem_notifier, nb); +} +EXPORT_SYMBOL_GPL(nvmem_unregister_notifier); + +static int nvmem_add_cells_from_table(struct nvmem_device *nvmem) +{ + const struct nvmem_cell_info *info; + struct nvmem_cell_table *table; + struct nvmem_cell *cell; + int rval = 0, i; + + mutex_lock(&nvmem_cell_mutex); + list_for_each_entry(table, &nvmem_cell_tables, node) { + if (strcmp(nvmem_dev_name(nvmem), table->nvmem_name) == 0) { + for (i = 0; i < table->ncells; i++) { + info = &table->cells[i]; + + cell = kzalloc(sizeof(*cell), GFP_KERNEL); + if (!cell) { + rval = -ENOMEM; + goto out; + } + + rval = nvmem_cell_info_to_nvmem_cell(nvmem, + info, + cell); + if (rval) { + kfree(cell); + goto out; + } + + nvmem_cell_add(cell); + } + } + } + +out: + mutex_unlock(&nvmem_cell_mutex); + return rval; +} + +static struct nvmem_cell * +nvmem_find_cell_by_name(struct nvmem_device *nvmem, const char *cell_id) +{ + struct nvmem_cell *cell = NULL; + + mutex_lock(&nvmem_mutex); + list_for_each_entry(cell, &nvmem->cells, node) { + if (strcmp(cell_id, cell->name) == 0) + break; + } + mutex_unlock(&nvmem_mutex); + + return cell; +} + +static int nvmem_add_cells_from_of(struct nvmem_device *nvmem) +{ + struct device_node *parent, *child; + struct device *dev = &nvmem->dev; + struct nvmem_cell *cell; + const __be32 *addr; + int len; + + parent = dev->of_node; + + for_each_child_of_node(parent, child) { + addr = of_get_property(child, "reg", &len); + if (!addr || (len < 2 * sizeof(u32))) { + dev_err(dev, "nvmem: invalid reg on %pOF\n", child); + return -EINVAL; + } + + cell = kzalloc(sizeof(*cell), GFP_KERNEL); + if (!cell) + return -ENOMEM; + + cell->nvmem = nvmem; + cell->offset = be32_to_cpup(addr++); + cell->bytes = be32_to_cpup(addr); + cell->name = kasprintf(GFP_KERNEL, "%pOFn", child); + + addr = of_get_property(child, "bits", &len); + if (addr && len == (2 * sizeof(u32))) { + cell->bit_offset = be32_to_cpup(addr++); + cell->nbits = be32_to_cpup(addr); + } + + if (cell->nbits) + cell->bytes = DIV_ROUND_UP( + cell->nbits + cell->bit_offset, + BITS_PER_BYTE); + + if (!IS_ALIGNED(cell->offset, nvmem->stride)) { + dev_err(dev, "cell %s unaligned to nvmem stride %d\n", + cell->name, nvmem->stride); + /* Cells already added will be freed later. */ + kfree(cell->name); + kfree(cell); + return -EINVAL; + } + + nvmem_cell_add(cell); + } + + return 0; +} + +/** * nvmem_register() - Register a nvmem device for given nvmem_config. * Also creates an binary entry in /sys/bus/nvmem/devices/dev-name/nvmem * @@ -467,6 +588,9 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config) return ERR_PTR(rval); } + kref_init(&nvmem->refcnt); + INIT_LIST_HEAD(&nvmem->cells); + nvmem->id = rval; nvmem->owner = config->owner; if (!nvmem->owner && config->dev->driver) @@ -516,11 +640,31 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config) goto err_device_del; } - if (config->cells) - nvmem_add_cells(nvmem, config->cells, config->ncells); + if (config->cells) { + rval = nvmem_add_cells(nvmem, config->cells, config->ncells); + if (rval) + goto err_teardown_compat; + } + + rval = nvmem_add_cells_from_table(nvmem); + if (rval) + goto err_remove_cells; + + rval = nvmem_add_cells_from_of(nvmem); + if (rval) + goto err_remove_cells; + + rval = blocking_notifier_call_chain(&nvmem_notifier, NVMEM_ADD, nvmem); + if (rval) + goto err_remove_cells; return nvmem; +err_remove_cells: + nvmem_device_remove_all_cells(nvmem); +err_teardown_compat: + if (config->compat) + device_remove_bin_file(nvmem->base_dev, &nvmem->eeprom); err_device_del: device_del(&nvmem->dev); err_put_device: @@ -530,21 +674,13 @@ err_put_device: } EXPORT_SYMBOL_GPL(nvmem_register); -/** - * nvmem_unregister() - Unregister previously registered nvmem device - * - * @nvmem: Pointer to previously registered nvmem device. - * - * Return: Will be an negative on error or a zero on success. - */ -int nvmem_unregister(struct nvmem_device *nvmem) +static void nvmem_device_release(struct kref *kref) { - mutex_lock(&nvmem_mutex); - if (nvmem->users) { - mutex_unlock(&nvmem_mutex); - return -EBUSY; - } - mutex_unlock(&nvmem_mutex); + struct nvmem_device *nvmem; + + nvmem = container_of(kref, struct nvmem_device, refcnt); + + blocking_notifier_call_chain(&nvmem_notifier, NVMEM_REMOVE, nvmem); if (nvmem->flags & FLAG_COMPAT) device_remove_bin_file(nvmem->base_dev, &nvmem->eeprom); @@ -552,14 +688,22 @@ int nvmem_unregister(struct nvmem_device *nvmem) nvmem_device_remove_all_cells(nvmem); device_del(&nvmem->dev); put_device(&nvmem->dev); +} - return 0; +/** + * nvmem_unregister() - Unregister previously registered nvmem device + * + * @nvmem: Pointer to previously registered nvmem device. + */ +void nvmem_unregister(struct nvmem_device *nvmem) +{ + kref_put(&nvmem->refcnt, nvmem_device_release); } EXPORT_SYMBOL_GPL(nvmem_unregister); static void devm_nvmem_release(struct device *dev, void *res) { - WARN_ON(nvmem_unregister(*(struct nvmem_device **)res)); + nvmem_unregister(*(struct nvmem_device **)res); } /** @@ -617,71 +761,34 @@ int devm_nvmem_unregister(struct device *dev, struct nvmem_device *nvmem) } EXPORT_SYMBOL(devm_nvmem_unregister); - static struct nvmem_device *__nvmem_device_get(struct device_node *np, - struct nvmem_cell **cellp, - const char *cell_id) + const char *nvmem_name) { struct nvmem_device *nvmem = NULL; mutex_lock(&nvmem_mutex); - - if (np) { - nvmem = of_nvmem_find(np); - if (!nvmem) { - mutex_unlock(&nvmem_mutex); - return ERR_PTR(-EPROBE_DEFER); - } - } else { - struct nvmem_cell *cell = nvmem_find_cell(cell_id); - - if (cell) { - nvmem = cell->nvmem; - *cellp = cell; - } - - if (!nvmem) { - mutex_unlock(&nvmem_mutex); - return ERR_PTR(-ENOENT); - } - } - - nvmem->users++; + nvmem = np ? of_nvmem_find(np) : nvmem_find(nvmem_name); mutex_unlock(&nvmem_mutex); + if (!nvmem) + return ERR_PTR(-EPROBE_DEFER); if (!try_module_get(nvmem->owner)) { dev_err(&nvmem->dev, "could not increase module refcount for cell %s\n", - nvmem->name); - - mutex_lock(&nvmem_mutex); - nvmem->users--; - mutex_unlock(&nvmem_mutex); + nvmem_dev_name(nvmem)); return ERR_PTR(-EINVAL); } + kref_get(&nvmem->refcnt); + return nvmem; } static void __nvmem_device_put(struct nvmem_device *nvmem) { module_put(nvmem->owner); - mutex_lock(&nvmem_mutex); - nvmem->users--; - mutex_unlock(&nvmem_mutex); -} - -static struct nvmem_device *nvmem_find(const char *name) -{ - struct device *d; - - d = bus_find_device_by_name(&nvmem_bus_type, NULL, name); - - if (!d) - return NULL; - - return to_nvmem_device(d); + kref_put(&nvmem->refcnt, nvmem_device_release); } #if IS_ENABLED(CONFIG_OF) @@ -706,7 +813,7 @@ struct nvmem_device *of_nvmem_device_get(struct device_node *np, const char *id) if (!nvmem_np) return ERR_PTR(-EINVAL); - return __nvmem_device_get(nvmem_np, NULL, NULL); + return __nvmem_device_get(nvmem_np, NULL); } EXPORT_SYMBOL_GPL(of_nvmem_device_get); #endif @@ -810,44 +917,86 @@ struct nvmem_device *devm_nvmem_device_get(struct device *dev, const char *id) } EXPORT_SYMBOL_GPL(devm_nvmem_device_get); -static struct nvmem_cell *nvmem_cell_get_from_list(const char *cell_id) +static struct nvmem_cell * +nvmem_cell_get_from_lookup(struct device *dev, const char *con_id) { - struct nvmem_cell *cell = NULL; + struct nvmem_cell *cell = ERR_PTR(-ENOENT); + struct nvmem_cell_lookup *lookup; struct nvmem_device *nvmem; + const char *dev_id; - nvmem = __nvmem_device_get(NULL, &cell, cell_id); - if (IS_ERR(nvmem)) - return ERR_CAST(nvmem); + if (!dev) + return ERR_PTR(-EINVAL); + dev_id = dev_name(dev); + + mutex_lock(&nvmem_lookup_mutex); + + list_for_each_entry(lookup, &nvmem_lookup_list, node) { + if ((strcmp(lookup->dev_id, dev_id) == 0) && + (strcmp(lookup->con_id, con_id) == 0)) { + /* This is the right entry. */ + nvmem = __nvmem_device_get(NULL, lookup->nvmem_name); + if (IS_ERR(nvmem)) { + /* Provider may not be registered yet. */ + cell = ERR_CAST(nvmem); + goto out; + } + + cell = nvmem_find_cell_by_name(nvmem, + lookup->cell_name); + if (!cell) { + __nvmem_device_put(nvmem); + cell = ERR_PTR(-ENOENT); + goto out; + } + } + } + +out: + mutex_unlock(&nvmem_lookup_mutex); return cell; } #if IS_ENABLED(CONFIG_OF) +static struct nvmem_cell * +nvmem_find_cell_by_index(struct nvmem_device *nvmem, int index) +{ + struct nvmem_cell *cell = NULL; + int i = 0; + + mutex_lock(&nvmem_mutex); + list_for_each_entry(cell, &nvmem->cells, node) { + if (index == i++) + break; + } + mutex_unlock(&nvmem_mutex); + + return cell; +} + /** * of_nvmem_cell_get() - Get a nvmem cell from given device node and cell id * * @np: Device tree node that uses the nvmem cell. - * @name: nvmem cell name from nvmem-cell-names property, or NULL - * for the cell at index 0 (the lone cell with no accompanying - * nvmem-cell-names property). + * @id: nvmem cell name from nvmem-cell-names property, or NULL + * for the cell at index 0 (the lone cell with no accompanying + * nvmem-cell-names property). * * Return: Will be an ERR_PTR() on error or a valid pointer * to a struct nvmem_cell. The nvmem_cell will be freed by the * nvmem_cell_put(). */ -struct nvmem_cell *of_nvmem_cell_get(struct device_node *np, - const char *name) +struct nvmem_cell *of_nvmem_cell_get(struct device_node *np, const char *id) { struct device_node *cell_np, *nvmem_np; - struct nvmem_cell *cell; struct nvmem_device *nvmem; - const __be32 *addr; - int rval, len; + struct nvmem_cell *cell; int index = 0; /* if cell name exists, find index to the name */ - if (name) - index = of_property_match_string(np, "nvmem-cell-names", name); + if (id) + index = of_property_match_string(np, "nvmem-cell-names", id); cell_np = of_parse_phandle(np, "nvmem-cells", index); if (!cell_np) @@ -857,59 +1006,18 @@ struct nvmem_cell *of_nvmem_cell_get(struct device_node *np, if (!nvmem_np) return ERR_PTR(-EINVAL); - nvmem = __nvmem_device_get(nvmem_np, NULL, NULL); + nvmem = __nvmem_device_get(nvmem_np, NULL); of_node_put(nvmem_np); if (IS_ERR(nvmem)) return ERR_CAST(nvmem); - addr = of_get_property(cell_np, "reg", &len); - if (!addr || (len < 2 * sizeof(u32))) { - dev_err(&nvmem->dev, "nvmem: invalid reg on %pOF\n", - cell_np); - rval = -EINVAL; - goto err_mem; - } - - cell = kzalloc(sizeof(*cell), GFP_KERNEL); + cell = nvmem_find_cell_by_index(nvmem, index); if (!cell) { - rval = -ENOMEM; - goto err_mem; - } - - cell->nvmem = nvmem; - cell->offset = be32_to_cpup(addr++); - cell->bytes = be32_to_cpup(addr); - cell->name = cell_np->name; - - addr = of_get_property(cell_np, "bits", &len); - if (addr && len == (2 * sizeof(u32))) { - cell->bit_offset = be32_to_cpup(addr++); - cell->nbits = be32_to_cpup(addr); + __nvmem_device_put(nvmem); + return ERR_PTR(-ENOENT); } - if (cell->nbits) - cell->bytes = DIV_ROUND_UP(cell->nbits + cell->bit_offset, - BITS_PER_BYTE); - - if (!IS_ALIGNED(cell->offset, nvmem->stride)) { - dev_err(&nvmem->dev, - "cell %s unaligned to nvmem stride %d\n", - cell->name, nvmem->stride); - rval = -EINVAL; - goto err_sanity; - } - - nvmem_cell_add(cell); - return cell; - -err_sanity: - kfree(cell); - -err_mem: - __nvmem_device_put(nvmem); - - return ERR_PTR(rval); } EXPORT_SYMBOL_GPL(of_nvmem_cell_get); #endif @@ -918,27 +1026,29 @@ EXPORT_SYMBOL_GPL(of_nvmem_cell_get); * nvmem_cell_get() - Get nvmem cell of device form a given cell name * * @dev: Device that requests the nvmem cell. - * @cell_id: nvmem cell name to get. + * @id: nvmem cell name to get (this corresponds with the name from the + * nvmem-cell-names property for DT systems and with the con_id from + * the lookup entry for non-DT systems). * * Return: Will be an ERR_PTR() on error or a valid pointer * to a struct nvmem_cell. The nvmem_cell will be freed by the * nvmem_cell_put(). */ -struct nvmem_cell *nvmem_cell_get(struct device *dev, const char *cell_id) +struct nvmem_cell *nvmem_cell_get(struct device *dev, const char *id) { struct nvmem_cell *cell; if (dev->of_node) { /* try dt first */ - cell = of_nvmem_cell_get(dev->of_node, cell_id); + cell = of_nvmem_cell_get(dev->of_node, id); if (!IS_ERR(cell) || PTR_ERR(cell) == -EPROBE_DEFER) return cell; } - /* NULL cell_id only allowed for device tree; invalid otherwise */ - if (!cell_id) + /* NULL cell id only allowed for device tree; invalid otherwise */ + if (!id) return ERR_PTR(-EINVAL); - return nvmem_cell_get_from_list(cell_id); + return nvmem_cell_get_from_lookup(dev, id); } EXPORT_SYMBOL_GPL(nvmem_cell_get); @@ -1015,7 +1125,6 @@ void nvmem_cell_put(struct nvmem_cell *cell) struct nvmem_device *nvmem = cell->nvmem; __nvmem_device_put(nvmem); - nvmem_cell_drop(cell); } EXPORT_SYMBOL_GPL(nvmem_cell_put); @@ -1267,7 +1376,7 @@ EXPORT_SYMBOL_GPL(nvmem_device_cell_read); * @buf: buffer to be written to cell. * * Return: length of bytes written or negative error code on failure. - * */ + */ int nvmem_device_cell_write(struct nvmem_device *nvmem, struct nvmem_cell_info *info, void *buf) { @@ -1323,7 +1432,7 @@ EXPORT_SYMBOL_GPL(nvmem_device_read); * @buf: buffer to be written. * * Return: length of bytes written or negative error code on failure. - * */ + */ int nvmem_device_write(struct nvmem_device *nvmem, unsigned int offset, size_t bytes, void *buf) @@ -1343,6 +1452,80 @@ int nvmem_device_write(struct nvmem_device *nvmem, } EXPORT_SYMBOL_GPL(nvmem_device_write); +/** + * nvmem_add_cell_table() - register a table of cell info entries + * + * @table: table of cell info entries + */ +void nvmem_add_cell_table(struct nvmem_cell_table *table) +{ + mutex_lock(&nvmem_cell_mutex); + list_add_tail(&table->node, &nvmem_cell_tables); + mutex_unlock(&nvmem_cell_mutex); +} +EXPORT_SYMBOL_GPL(nvmem_add_cell_table); + +/** + * nvmem_del_cell_table() - remove a previously registered cell info table + * + * @table: table of cell info entries + */ +void nvmem_del_cell_table(struct nvmem_cell_table *table) +{ + mutex_lock(&nvmem_cell_mutex); + list_del(&table->node); + mutex_unlock(&nvmem_cell_mutex); +} +EXPORT_SYMBOL_GPL(nvmem_del_cell_table); + +/** + * nvmem_add_cell_lookups() - register a list of cell lookup entries + * + * @entries: array of cell lookup entries + * @nentries: number of cell lookup entries in the array + */ +void nvmem_add_cell_lookups(struct nvmem_cell_lookup *entries, size_t nentries) +{ + int i; + + mutex_lock(&nvmem_lookup_mutex); + for (i = 0; i < nentries; i++) + list_add_tail(&entries[i].node, &nvmem_lookup_list); + mutex_unlock(&nvmem_lookup_mutex); +} +EXPORT_SYMBOL_GPL(nvmem_add_cell_lookups); + +/** + * nvmem_del_cell_lookups() - remove a list of previously added cell lookup + * entries + * + * @entries: array of cell lookup entries + * @nentries: number of cell lookup entries in the array + */ +void nvmem_del_cell_lookups(struct nvmem_cell_lookup *entries, size_t nentries) +{ + int i; + + mutex_lock(&nvmem_lookup_mutex); + for (i = 0; i < nentries; i++) + list_del(&entries[i].node); + mutex_unlock(&nvmem_lookup_mutex); +} +EXPORT_SYMBOL_GPL(nvmem_del_cell_lookups); + +/** + * nvmem_dev_name() - Get the name of a given nvmem device. + * + * @nvmem: nvmem device. + * + * Return: name of the nvmem device. + */ +const char *nvmem_dev_name(struct nvmem_device *nvmem) +{ + return dev_name(&nvmem->dev); +} +EXPORT_SYMBOL_GPL(nvmem_dev_name); + static int __init nvmem_init(void) { return bus_register(&nvmem_bus_type); |