sf: unify read/write helpers

These functions largely do the same exact thing, so unify them all
into one basic function.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
index b61d219..2b7f22c 100644 (file)
--- a/drivers/mtd/spi/spi_flash.c
+++ b/drivers/mtd/spi/spi_flash.c
@@ -14,32 +14,10 @@
 
 #include "spi_flash_internal.h"
 
-int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len)
-{
-       unsigned long flags = SPI_XFER_BEGIN;
-       int ret;
-
-       if (len == 0)
-               flags |= SPI_XFER_END;
-
-       ret = spi_xfer(spi, 8, &cmd, NULL, flags);
-       if (ret) {
-               debug("SF: Failed to send command %02x: %d\n", cmd, ret);
-               return ret;
-       }
-
-       if (len) {
-               ret = spi_xfer(spi, len * 8, NULL, response, SPI_XFER_END);
-               if (ret)
-                       debug("SF: Failed to read response (%zu bytes): %d\n",
-                                       len, ret);
-       }
-
-       return ret;
-}
-
-int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd,
-               size_t cmd_len, void *data, size_t data_len)
+static int spi_flash_read_write(struct spi_slave *spi,
+                               const u8 *cmd, size_t cmd_len,
+                               const u8 *data_out, u8 *data_in,
+                               size_t data_len)
 {
        unsigned long flags = SPI_XFER_BEGIN;
        int ret;
@@ -49,41 +27,34 @@ int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd,
 
        ret = spi_xfer(spi, cmd_len * 8, cmd, NULL, flags);
        if (ret) {
-               debug("SF: Failed to send read command (%zu bytes): %d\n",
+               debug("SF: Failed to send command (%zu bytes): %d\n",
                                cmd_len, ret);
        } else if (data_len != 0) {
-               ret = spi_xfer(spi, data_len * 8, NULL, data, SPI_XFER_END);
+               ret = spi_xfer(spi, data_len * 8, data_out, data_in, SPI_XFER_END);
                if (ret)
-                       debug("SF: Failed to read %zu bytes of data: %d\n",
+                       debug("SF: Failed to transfer %zu bytes of data: %d\n",
                                        data_len, ret);
        }
 
        return ret;
 }
 
-int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len,
-               const void *data, size_t data_len)
+int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len)
 {
-       unsigned long flags = SPI_XFER_BEGIN;
-       int ret;
-
-       if (data_len == 0)
-               flags |= SPI_XFER_END;
-
-       ret = spi_xfer(spi, cmd_len * 8, cmd, NULL, flags);
-       if (ret) {
-               debug("SF: Failed to send read command (%zu bytes): %d\n",
-                               cmd_len, ret);
-       } else if (data_len != 0) {
-               ret = spi_xfer(spi, data_len * 8, data, NULL, SPI_XFER_END);
-               if (ret)
-                       debug("SF: Failed to read %zu bytes of data: %d\n",
-                                       data_len, ret);
-       }
+       return spi_flash_cmd_read(spi, &cmd, 1, response, len);
+}
 
-       return ret;
+int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd,
+               size_t cmd_len, void *data, size_t data_len)
+{
+       return spi_flash_read_write(spi, cmd, cmd_len, NULL, data, data_len);
 }
 
+int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len,
+               const void *data, size_t data_len)
+{
+       return spi_flash_read_write(spi, cmd, cmd_len, data, NULL, data_len);
+}
 
 int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd,
                size_t cmd_len, void *data, size_t data_len)