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can: mcp251xfd: mcp251xfd_regmap_crc_read_one(): Factor out crc check into separate function 

This patch factors out the crc check into a separate function. This is
preparation for the next patch.

Link: https://lore.kernel.org/r/20210406110617.1865592-4-mkl@pengutronix.de
Cc: Manivannan Sadhasivam <mani@kernel.org>
Cc: Thomas Kopp <thomas.kopp@microchip.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde 2021-03-15 08:59:15 +01:00
parent 0084e298ac
commit ef7a8c3e75
1 changed files with 22 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
drivers/net/can/spi/mcp251xfd/mcp251xfd-regmap.c
View File

@ -233,20 +233,11 @@ mcp251xfd_regmap_crc_write(void *context,
}
static int
mcp251xfd_regmap_crc_read_one(struct mcp251xfd_priv *priv,
struct spi_message *msg, unsigned int data_len)
mcp251xfd_regmap_crc_read_check_crc(const struct mcp251xfd_map_buf_crc * const buf_rx,
const struct mcp251xfd_map_buf_crc * const buf_tx,
unsigned int data_len)
{
const struct mcp251xfd_map_buf_crc *buf_rx = priv->map_buf_crc_rx;
const struct mcp251xfd_map_buf_crc *buf_tx = priv->map_buf_crc_tx;
u16 crc_received, crc_calculated;
int err;
BUILD_BUG_ON(sizeof(buf_rx->cmd) != sizeof(__be16) + sizeof(u8));
BUILD_BUG_ON(sizeof(buf_tx->cmd) != sizeof(__be16) + sizeof(u8));
err = spi_sync(priv->spi, msg);
if (err)
return err;
crc_received = get_unaligned_be16(buf_rx->data + data_len);
crc_calculated = mcp251xfd_crc16_compute2(&buf_tx->cmd,
@ -259,6 +250,25 @@ mcp251xfd_regmap_crc_read_one(struct mcp251xfd_priv *priv,
return 0;
}
static int
mcp251xfd_regmap_crc_read_one(struct mcp251xfd_priv *priv,
struct spi_message *msg, unsigned int data_len)
{
const struct mcp251xfd_map_buf_crc *buf_rx = priv->map_buf_crc_rx;
const struct mcp251xfd_map_buf_crc *buf_tx = priv->map_buf_crc_tx;
int err;
BUILD_BUG_ON(sizeof(buf_rx->cmd) != sizeof(__be16) + sizeof(u8));
BUILD_BUG_ON(sizeof(buf_tx->cmd) != sizeof(__be16) + sizeof(u8));
err = spi_sync(priv->spi, msg);
if (err)
return err;
return mcp251xfd_regmap_crc_read_check_crc(buf_rx, buf_tx, data_len);
}
static int
mcp251xfd_regmap_crc_read(void *context,
const void *reg_p, size_t reg_len,