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Date: Wed, 20 Jan 2010 15:36:00 -0800
From: Randy Dunlap <randy.dunlap@...cle.com>
To: sjur.brandeland@...ricsson.com
Cc: netdev@...r.kernel.org, davem@...emloft.net, marcel@...tmann.org,
stefano.babic@...ic.homelinux.org
Subject: Re: [PATCH net-next-2.6 13/13] net-caif-driver: add CAIF serial
driver (ldisc)
On Wed, 20 Jan 2010 23:55:30 +0100 sjur.brandeland@...ricsson.com wrote:
> From: Sjur Braendeland <sjur.brandeland@...ricsson.com>
>
> Add CAIF Serial driver. This driver is implemented as a line discipline.
> The TTY is opened from inside the kernel module.
>
> caif_serial uses the following module parameters:
> ser_ttyname - specifies the tty name.
> ser_use_stx - specifies if STart of frame eXtension is in use.
> ser_loop - sets the interface in loopback mode.
>
> Signed-off-by: Sjur Braendeland <sjur.brandeland@...ricsson.com>
> ---
> drivers/net/Kconfig | 2 +
> drivers/net/Makefile | 1 +
> drivers/net/caif/Kconfig | 15 ++
> drivers/net/caif/Makefile | 14 ++
> drivers/net/caif/caif_serial.c | 420 ++++++++++++++++++++++++++++++++++++++++
> include/linux/tty.h | 4 +-
> 6 files changed, 454 insertions(+), 2 deletions(-)
> create mode 100644 drivers/net/caif/Kconfig
> create mode 100644 drivers/net/caif/Makefile
> create mode 100644 drivers/net/caif/caif_serial.c
> diff --git a/drivers/net/caif/Makefile b/drivers/net/caif/Makefile
> new file mode 100644
> index 0000000..01784a0
> --- /dev/null
> +++ b/drivers/net/caif/Makefile
> @@ -0,0 +1,14 @@
> +ifeq ($(CONFIG_CAIF_DEBUG),1)
> +CAIF_DBG_FLAGS := -DDEBUG
> +endif
> +
> +KBUILD_EXTRA_SYMBOLS=net/caif/Module.symvers
> +
> +ccflags-y := $(CAIF_FLAGS) $(CAIF_DBG_FLAGS)
> +clean-dirs:= .tmp_versions
> +clean-files:= Module.symvers modules.order *.cmd *~ \
> +
> +# Serial interface
> +obj-$(CONFIG_CAIF_TTY) += caif_serial.o
> +
> +
> diff --git a/drivers/net/caif/caif_serial.c b/drivers/net/caif/caif_serial.c
> new file mode 100644
> index 0000000..7d6636b
> --- /dev/null
> +++ b/drivers/net/caif/caif_serial.c
> @@ -0,0 +1,420 @@
> +/*
> + * Copyright (C) ST-Ericsson AB 2010
> + * Author: Sjur Brendeland / sjur.brandeland@...ricsson.com
> + * License terms: GNU General Public License (GPL) version 2
> + */
> +
> +#include <linux/init.h>
> +#include <linux/version.h>
> +#include <linux/module.h>
> +#include <linux/device.h>
> +#include <linux/types.h>
> +#include <linux/skbuff.h>
> +#include <linux/netdevice.h>
> +#include <linux/rtnetlink.h>
> +#include <linux/tty.h>
> +#include <linux/file.h>
> +#include <linux/if_arp.h>
> +#include <net/caif/caif_device.h>
> +#include <net/caif/generic/caif_layer.h>
> +#include <net/caif/generic/cfcnfg.h>
> +#include <linux/err.h>
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Sjur Brendeland<sjur.brandeland@...ricsson.com>");
> +MODULE_DESCRIPTION("CAIF serial device TTY line discipline");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS_LDISC(N_CAIF);
> +
> +#define CAIF_SENDING 1
> +#define CAIF_UART_TX_COMPLETED 2
> +#define CAIF_FLOW_OFF_SENT 4
> +#define MAX_WRITE_CHUNK 4096
> +#define ON 1
> +#define OFF 0
> +#define CAIF_MAX_MTU 4096
> +
> +struct net_device *device;
> +char *ser_ttyname = "/dev/ttyS0";
> +module_param(ser_ttyname, charp, S_IRUGO);
> +MODULE_PARM_DESC(ser_ttyname, "TTY to open.");
> +
Can't a lot of these data items be static? (above & below)
> +int ser_loop;
> +module_param(ser_loop, bool, S_IRUGO);
> +MODULE_PARM_DESC(ser_loop, "Run in simulated loopback mode.");
> +
> +int ser_use_stx;
> +module_param(ser_use_stx, bool, S_IRUGO);
> +MODULE_PARM_DESC(ser_use_stx, "STX enabled or not.");
> +
> +int ser_write_chunk = MAX_WRITE_CHUNK;
> +module_param(ser_write_chunk, int, S_IRUGO);
> +
> +MODULE_PARM_DESC(ser_write_chunk, "Maximum size of data written to UART.");
> +
> +
> +static int caif_net_open(struct net_device *dev);
> +static int caif_net_close(struct net_device *dev);
> +
> +struct ser_device {
> + struct caif_dev_common common;
> + struct net_device *dev;
> + struct sk_buff_head head;
> + int xoff;
> + struct tty_struct *tty;
> + bool tx_started;
> + unsigned long state;
> + struct file *file;
> + char *tty_name;
> +};
> +
> +static int ser_phy_tx(struct ser_device *ser, struct sk_buff *skb);
> +static void caifdev_setup(struct net_device *dev);
> +static void ser_tx_wakeup(struct tty_struct *tty);
> +
...
> +
> +static int start_ldisc(struct ser_device *ser)
> +{
> + struct file *f;
> + mm_segment_t oldfs;
> + struct termios tio;
> + int ldiscnr = N_CAIF;
> + int ret;
> + f = filp_open(ser->tty_name, 0, 0);
> + if (IS_ERR(f)) {
> + dev_err(&ser->dev->dev, "CAIF cannot open:%s\n", ser->tty_name);
> + ret = -EINVAL;
> + goto error;
> + }
> + if (f == NULL || f->f_op == NULL || f->f_op->unlocked_ioctl == NULL) {
> + dev_err(&ser->dev->dev, "TTY cannot do IOCTL:%s\n",
> + ser->tty_name);
> + ret = -EINVAL;
I'm thinking that the errcode should be (negative) ENOTTY...
> + goto error;
> + }
> +
> + ser->file = f;
> + oldfs = get_fs();
> + set_fs(KERNEL_DS);
> +
> + f->f_op->unlocked_ioctl(f, TCFLSH, 0x2);
> + memset(&tio, 0, sizeof(tio));
> + tio.c_cflag = B115200 | CRTSCTS | CS8 | CLOCAL | CREAD;
> + f->f_op->unlocked_ioctl(f, TCSETS, (long unsigned int)&tio);
> + f->f_op->unlocked_ioctl(f, TIOCSETD, (long unsigned int)&ldiscnr);
> + set_fs(oldfs);
> + return 0;
> +error:
> + oldfs = get_fs();
> + set_fs(KERNEL_DS);
> + return ret;
> +}
---
~Randy
--
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