diff options
Diffstat (limited to 'drivers/nvmem/core.c')
| -rw-r--r-- | drivers/nvmem/core.c | 43 |
1 files changed, 40 insertions, 3 deletions
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index 4c49285168fb..de54c7f5048a 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -290,7 +290,7 @@ static struct nvmem_cell *nvmem_find_cell(const char *cell_id) mutex_lock(&nvmem_cells_mutex); list_for_each_entry(p, &nvmem_cells, node) - if (p && !strcmp(p->name, cell_id)) { + if (!strcmp(p->name, cell_id)) { mutex_unlock(&nvmem_cells_mutex); return p; } @@ -794,8 +794,8 @@ struct nvmem_cell *of_nvmem_cell_get(struct device_node *np, addr = of_get_property(cell_np, "reg", &len); if (!addr || (len < 2 * sizeof(u32))) { - dev_err(&nvmem->dev, "nvmem: invalid reg on %s\n", - cell_np->full_name); + dev_err(&nvmem->dev, "nvmem: invalid reg on %pOF\n", + cell_np); rval = -EINVAL; goto err_mem; } @@ -1111,6 +1111,43 @@ int nvmem_cell_write(struct nvmem_cell *cell, void *buf, size_t len) EXPORT_SYMBOL_GPL(nvmem_cell_write); /** + * nvmem_cell_read_u32() - Read a cell value as an u32 + * + * @dev: Device that requests the nvmem cell. + * @cell_id: Name of nvmem cell to read. + * @val: pointer to output value. + * + * Return: 0 on success or negative errno. + */ +int nvmem_cell_read_u32(struct device *dev, const char *cell_id, u32 *val) +{ + struct nvmem_cell *cell; + void *buf; + size_t len; + + cell = nvmem_cell_get(dev, cell_id); + if (IS_ERR(cell)) + return PTR_ERR(cell); + + buf = nvmem_cell_read(cell, &len); + if (IS_ERR(buf)) { + nvmem_cell_put(cell); + return PTR_ERR(buf); + } + if (len != sizeof(*val)) { + kfree(buf); + nvmem_cell_put(cell); + return -EINVAL; + } + memcpy(val, buf, sizeof(*val)); + + kfree(buf); + nvmem_cell_put(cell); + return 0; +} +EXPORT_SYMBOL_GPL(nvmem_cell_read_u32); + +/** * nvmem_device_cell_read() - Read a given nvmem device and cell * * @nvmem: nvmem device to read from. |