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authorBartosz Golaszewski <bgolaszewski@baylibre.com>2018-09-21 06:40:15 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-09-28 15:14:54 +0200
commitb985f4cba6dbb3b60ad119c6f7e5cbad6f0d7e45 (patch)
tree6062e9d3fb702b0cbc496f8a8e2003f7696638fd /drivers/nvmem/core.c
parentc7235ee3f4b86a01507a12e96a4875ba9b4be842 (diff)
downloadlinux-b985f4cba6dbb3b60ad119c6f7e5cbad6f0d7e45.tar.bz2
nvmem: add support for cell info
Add new structs and routines allowing users to define nvmem cells from machine code. This global list of entries is parsed when a provider is registered and cells are associated with the relevant nvmem_device struct. A possible improvement for the future is to allow users to register cell tables after the nvmem provider has been registered by updating the cell list at each call to nvmem_(add|del)_cell_table(). Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/nvmem/core.c')
-rw-r--r--drivers/nvmem/core.c72
1 files changed, 72 insertions, 0 deletions
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index ee794613024c..8e0108806e65 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -59,6 +59,9 @@ struct nvmem_cell {
static DEFINE_MUTEX(nvmem_mutex);
static DEFINE_IDA(nvmem_ida);
+static DEFINE_MUTEX(nvmem_cell_mutex);
+static LIST_HEAD(nvmem_cell_tables);
+
#ifdef CONFIG_DEBUG_LOCK_ALLOC
static struct lock_class_key eeprom_lock_key;
#endif
@@ -416,6 +419,43 @@ static int nvmem_setup_compat(struct nvmem_device *nvmem,
return 0;
}
+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;
+}
+
/**
* nvmem_register() - Register a nvmem device for given nvmem_config.
* Also creates an binary entry in /sys/bus/nvmem/devices/dev-name/nvmem
@@ -502,8 +542,14 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
goto err_teardown_compat;
}
+ rval = nvmem_add_cells_from_table(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);
@@ -1307,6 +1353,32 @@ 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_dev_name() - Get the name of a given nvmem device.
*
* @nvmem: nvmem device.