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authorDouglas Anderson <dianders@chromium.org>2021-03-30 12:12:37 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-04-02 16:26:33 +0200
commita28e824fb8270eda43fd0f65c2a5fdf33f55c5eb (patch)
treed8a6a2b59944c9c686d6bafa5000de91c630a6f1 /drivers/nvmem
parent3fef9ed0627af30753a2404b8bd59d92cdb4c0ce (diff)
nvmem: core: Add functions to make number reading easy
Sometimes the clients of nvmem just want to get a number out of nvmem. They don't want to think about exactly how many bytes the nvmem cell took up. They just want the number. Let's make it easy. In general this concept is useful because nvmem space is precious and usually the fewest bits are allocated that will hold a given value on a given system. However, even though small numbers might be fine on one system that doesn't mean that logically the number couldn't be bigger. Imagine nvmem containing a max frequency for a component. On one system perhaps that fits in 16 bits. On another system it might fit in 32 bits. The code reading this number doesn't care--it just wants the number. We'll provide two functions: nvmem_cell_read_variable_le_u32() and nvmem_cell_read_variable_le_u64(). Comparing these to the existing functions like nvmem_cell_read_u32(): * These new functions have no problems if the value was stored in nvmem in fewer bytes. It's OK to use these function as long as the value stored will fit in 32-bits (or 64-bits). * These functions avoid problems that the earlier APIs had with bit offsets. For instance, you can't use nvmem_cell_read_u32() to read a value has nbits=32 and bit_offset=4 because the nvmem cell must be at least 5 bytes big to hold this value. The new API accounts for this and works fine. * These functions make it very explicit that they assume that the number was stored in little endian format. The old functions made this assumption whenever bit_offset was non-zero (see nvmem_shift_read_buffer_in_place()) but didn't whenever the bit_offset was zero. NOTE: it's assumed that we don't need an 8-bit or 16-bit version of this function. The 32-bit version of the function can be used to read 8-bit or 16-bit data. At the moment, I'm only adding the "unsigned" versions of these functions, but if it ends up being useful someone could add a "signed" version that did 2's complement sign extension. At the moment, I'm only adding the "little endian" versions of these functions. Adding the "big endian" version would require adding "big endian" support to nvmem_shift_read_buffer_in_place(). Signed-off-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20210330111241.19401-7-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/nvmem')
-rw-r--r--drivers/nvmem/core.c95
1 files changed, 95 insertions, 0 deletions
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index a5ab1e0c74cf..635e3131eb5f 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -1606,6 +1606,101 @@ int nvmem_cell_read_u64(struct device *dev, const char *cell_id, u64 *val)
}
EXPORT_SYMBOL_GPL(nvmem_cell_read_u64);
+static void *nvmem_cell_read_variable_common(struct device *dev,
+ const char *cell_id,
+ size_t max_len, size_t *len)
+{
+ struct nvmem_cell *cell;
+ int nbits;
+ void *buf;
+
+ cell = nvmem_cell_get(dev, cell_id);
+ if (IS_ERR(cell))
+ return cell;
+
+ nbits = cell->nbits;
+ buf = nvmem_cell_read(cell, len);
+ nvmem_cell_put(cell);
+ if (IS_ERR(buf))
+ return buf;
+
+ /*
+ * If nbits is set then nvmem_cell_read() can significantly exaggerate
+ * the length of the real data. Throw away the extra junk.
+ */
+ if (nbits)
+ *len = DIV_ROUND_UP(nbits, 8);
+
+ if (*len > max_len) {
+ kfree(buf);
+ return ERR_PTR(-ERANGE);
+ }
+
+ return buf;
+}
+
+/**
+ * nvmem_cell_read_variable_le_u32() - Read up to 32-bits of data as a little endian number.
+ *
+ * @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_variable_le_u32(struct device *dev, const char *cell_id,
+ u32 *val)
+{
+ size_t len;
+ u8 *buf;
+ int i;
+
+ buf = nvmem_cell_read_variable_common(dev, cell_id, sizeof(*val), &len);
+ if (IS_ERR(buf))
+ return PTR_ERR(buf);
+
+ /* Copy w/ implicit endian conversion */
+ *val = 0;
+ for (i = 0; i < len; i++)
+ *val |= buf[i] << (8 * i);
+
+ kfree(buf);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nvmem_cell_read_variable_le_u32);
+
+/**
+ * nvmem_cell_read_variable_le_u64() - Read up to 64-bits of data as a little endian number.
+ *
+ * @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_variable_le_u64(struct device *dev, const char *cell_id,
+ u64 *val)
+{
+ size_t len;
+ u8 *buf;
+ int i;
+
+ buf = nvmem_cell_read_variable_common(dev, cell_id, sizeof(*val), &len);
+ if (IS_ERR(buf))
+ return PTR_ERR(buf);
+
+ /* Copy w/ implicit endian conversion */
+ *val = 0;
+ for (i = 0; i < len; i++)
+ *val |= buf[i] << (8 * i);
+
+ kfree(buf);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nvmem_cell_read_variable_le_u64);
+
/**
* nvmem_device_cell_read() - Read a given nvmem device and cell
*