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Subject[PATCH] ioctl for getting RS485 information on Cris architecture
Hi Jesper, hi Mikael, 

I think that the Cris architecture should provide a full RS485 interface (like the atmel_serial driver).

Therefore, I propose this patch which adds an ioctl to get RS485 information from user-level.

Best regards,

Claudio


Cris serial driver: ioctl to get RS485 data from user-space

Signed-off-by: Claudio Scordino <claudio@evidence.eu.com>
---
arch/cris/include/asm/ioctls.h | 1 +
drivers/serial/crisv10.c | 11 +++++++++++
2 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/arch/cris/include/asm/ioctls.h b/arch/cris/include/asm/ioctls.h
index 35bbc18..076c078 100644
--- a/arch/cris/include/asm/ioctls.h
+++ b/arch/cris/include/asm/ioctls.h
@@ -77,6 +77,7 @@
#define TIOCSERSETRS485 0x5461 /* enable rs-485 (deprecated) */
#define TIOCSERWRRS485 0x5462 /* write rs-485 */
#define TIOCSRS485 0x5463 /* enable rs-485 */
+#define TIOCGRS485 0x542E /* get rs-485 */

/* Used for packet mode */
#define TIOCPKT_DATA 0
diff --git a/drivers/serial/crisv10.c b/drivers/serial/crisv10.c
index 31f1723..3062644 100644
--- a/drivers/serial/crisv10.c
+++ b/drivers/serial/crisv10.c
@@ -3724,6 +3724,17 @@ rs_ioctl(struct tty_struct *tty, struct file * file,
return e100_enable_rs485(tty, &rs485data);
}

+ case TIOCGRS485:
+ {
+ struct serial_rs485 *rs485data =
+ &(((struct e100_serial *)tty->driver_data)->rs485);
+ /* This is the ioctl to get RS485 data from user-space */
+ if (copy_to_user((struct serial_rs485 *) arg,
+ rs485data,
+ sizeof(serial_rs485)))
+ return -EFAULT;
+ break;
+ }

case TIOCSERWRRS485:
{
--
1.6.0.4


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