nvmem_reg_write_t reg_write;
nvmem_cell_post_process_t cell_post_process;
struct gpio_desc *wp_gpio;
+ struct nvmem_layout *layout;
void *priv;
};
static BLOCKING_NOTIFIER_HEAD(nvmem_notifier);
+static DEFINE_SPINLOCK(nvmem_layout_lock);
+static LIST_HEAD(nvmem_layouts);
+
static int __nvmem_reg_read(struct nvmem_device *nvmem, unsigned int offset,
void *val, size_t bytes)
{
return 0;
}
+int __nvmem_layout_register(struct nvmem_layout *layout, struct module *owner)
+{
+ layout->owner = owner;
+
+ spin_lock(&nvmem_layout_lock);
+ list_add(&layout->node, &nvmem_layouts);
+ spin_unlock(&nvmem_layout_lock);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(__nvmem_layout_register);
+
+void nvmem_layout_unregister(struct nvmem_layout *layout)
+{
+ spin_lock(&nvmem_layout_lock);
+ list_del(&layout->node);
+ spin_unlock(&nvmem_layout_lock);
+}
+EXPORT_SYMBOL_GPL(nvmem_layout_unregister);
+
+static struct nvmem_layout *nvmem_layout_get(struct nvmem_device *nvmem)
+{
+ struct device_node *layout_np, *np = nvmem->dev.of_node;
+ struct nvmem_layout *l, *layout = NULL;
+
+ layout_np = of_get_child_by_name(np, "nvmem-layout");
+ if (!layout_np)
+ return NULL;
+
+ spin_lock(&nvmem_layout_lock);
+
+ list_for_each_entry(l, &nvmem_layouts, node) {
+ if (of_match_node(l->of_match_table, layout_np)) {
+ if (try_module_get(l->owner))
+ layout = l;
+
+ break;
+ }
+ }
+
+ spin_unlock(&nvmem_layout_lock);
+ of_node_put(layout_np);
+
+ return layout;
+}
+
+static void nvmem_layout_put(struct nvmem_layout *layout)
+{
+ if (layout)
+ module_put(layout->owner);
+}
+
+static int nvmem_add_cells_from_layout(struct nvmem_device *nvmem)
+{
+ struct nvmem_layout *layout = nvmem->layout;
+ int ret;
+
+ if (layout && layout->add_cells) {
+ ret = layout->add_cells(&nvmem->dev, nvmem, layout);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+#if IS_ENABLED(CONFIG_OF)
+/**
+ * of_nvmem_layout_get_container() - Get OF node to layout container.
+ *
+ * @nvmem: nvmem device.
+ *
+ * Return: a node pointer with refcount incremented or NULL if no
+ * container exists. Use of_node_put() on it when done.
+ */
+struct device_node *of_nvmem_layout_get_container(struct nvmem_device *nvmem)
+{
+ return of_get_child_by_name(nvmem->dev.of_node, "nvmem-layout");
+}
+EXPORT_SYMBOL_GPL(of_nvmem_layout_get_container);
+#endif
+
+const void *nvmem_layout_get_match_data(struct nvmem_device *nvmem,
+ struct nvmem_layout *layout)
+{
+ struct device_node __maybe_unused *layout_np;
+ const struct of_device_id *match;
+
+ layout_np = of_nvmem_layout_get_container(nvmem);
+ match = of_match_node(layout->of_match_table, layout_np);
+
+ return match ? match->data : NULL;
+}
+EXPORT_SYMBOL_GPL(nvmem_layout_get_match_data);
+
/**
* nvmem_register() - Register a nvmem device for given nvmem_config.
* Also creates a binary entry in /sys/bus/nvmem/devices/dev-name/nvmem
goto err_put_device;
}
+ /*
+ * If the driver supplied a layout by config->layout, the module
+ * pointer will be NULL and nvmem_layout_put() will be a noop.
+ */
+ nvmem->layout = config->layout ?: nvmem_layout_get(nvmem);
+
if (config->cells) {
rval = nvmem_add_cells(nvmem, config->cells, config->ncells);
if (rval)
if (rval)
goto err_remove_cells;
+ rval = nvmem_add_cells_from_layout(nvmem);
+ if (rval)
+ goto err_remove_cells;
+
blocking_notifier_call_chain(&nvmem_notifier, NVMEM_ADD, nvmem);
return nvmem;
err_remove_cells:
nvmem_device_remove_all_cells(nvmem);
+ nvmem_layout_put(nvmem->layout);
if (config->compat)
nvmem_sysfs_remove_compat(nvmem, config);
err_put_device:
device_remove_bin_file(nvmem->base_dev, &nvmem->eeprom);
nvmem_device_remove_all_cells(nvmem);
+ nvmem_layout_put(nvmem->layout);
device_unregister(&nvmem->dev);
}
return ERR_PTR(-EINVAL);
}
+ /* nvmem layouts produce cells within the nvmem-layout container */
+ if (of_node_name_eq(nvmem_np, "nvmem-layout")) {
+ nvmem_np = of_get_next_parent(nvmem_np);
+ if (!nvmem_np) {
+ of_node_put(cell_np);
+ return ERR_PTR(-EINVAL);
+ }
+ }
+
nvmem = __nvmem_device_get(nvmem_np, device_match_of_node);
of_node_put(nvmem_np);
if (IS_ERR(nvmem)) {
* @stride: Minimum read/write access stride.
* @priv: User context passed to read/write callbacks.
* @ignore_wp: Write Protect pin is managed by the provider.
+ * @layout: Fixed layout associated with this nvmem device.
*
* Note: A default "nvmem<id>" name will be assigned to the device if
* no name is specified in its configuration. In such case "<id>" is
bool read_only;
bool root_only;
bool ignore_wp;
+ struct nvmem_layout *layout;
struct device_node *of_node;
bool no_of_node;
nvmem_reg_read_t reg_read;
struct list_head node;
};
+/**
+ * struct nvmem_layout - NVMEM layout definitions
+ *
+ * @name: Layout name.
+ * @of_match_table: Open firmware match table.
+ * @add_cells: Will be called if a nvmem device is found which
+ * has this layout. The function will add layout
+ * specific cells with nvmem_add_one_cell().
+ * @owner: Pointer to struct module.
+ * @node: List node.
+ *
+ * A nvmem device can hold a well defined structure which can just be
+ * evaluated during runtime. For example a TLV list, or a list of "name=val"
+ * pairs. A nvmem layout can parse the nvmem device and add appropriate
+ * cells.
+ */
+struct nvmem_layout {
+ const char *name;
+ const struct of_device_id *of_match_table;
+ int (*add_cells)(struct device *dev, struct nvmem_device *nvmem,
+ struct nvmem_layout *layout);
+
+ /* private */
+ struct module *owner;
+ struct list_head node;
+};
+
#if IS_ENABLED(CONFIG_NVMEM)
struct nvmem_device *nvmem_register(const struct nvmem_config *cfg);
int nvmem_add_one_cell(struct nvmem_device *nvmem,
const struct nvmem_cell_info *info);
+int __nvmem_layout_register(struct nvmem_layout *layout, struct module *owner);
+#define nvmem_layout_register(layout) \
+ __nvmem_layout_register(layout, THIS_MODULE)
+void nvmem_layout_unregister(struct nvmem_layout *layout);
+
+const void *nvmem_layout_get_match_data(struct nvmem_device *nvmem,
+ struct nvmem_layout *layout);
+
#else
static inline struct nvmem_device *nvmem_register(const struct nvmem_config *c)
return -EOPNOTSUPP;
}
+static inline int nvmem_layout_register(struct nvmem_layout *layout)
+{
+ return -EOPNOTSUPP;
+}
+
+static inline void nvmem_layout_unregister(struct nvmem_layout *layout) {}
+
+static inline const void *
+nvmem_layout_get_match_data(struct nvmem_device *nvmem,
+ struct nvmem_layout *layout)
+{
+ return NULL;
+}
+
#endif /* CONFIG_NVMEM */
#endif /* ifndef _LINUX_NVMEM_PROVIDER_H */