From: J Freyensee <[email protected]> This patch renames ptirouter_ldisc to n_tracerouter to a more linux kernel naming convention. NO added functionality or bug fixes are in this patch; it's just a rename.
Signed-off-by: J Freyensee <[email protected]> --- drivers/char/Kconfig | 2 +- drivers/char/Makefile | 2 +- drivers/char/n_tracerouter.c | 202 ++++++++++++++++++++++++++++++++++++++++++ include/linux/tty.h | 2 +- 4 files changed, 205 insertions(+), 3 deletions(-) create mode 100644 drivers/char/n_tracerouter.c diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig index f7a9e3b..d561b8c 100644 --- a/drivers/char/Kconfig +++ b/drivers/char/Kconfig @@ -110,7 +110,7 @@ config BFIN_JTAG_COMM_CONSOLE bool "Console on Blackfin JTAG" depends on BFIN_JTAG_COMM=y -config PTI_ROUTER +config TRACE_ROUTER tristate "Trace data router for MIPI P1149.7 cJTAG standard" depends on INTEL_MID_PTI ---help--- diff --git a/drivers/char/Makefile b/drivers/char/Makefile index c228d43..734eddb 100644 --- a/drivers/char/Makefile +++ b/drivers/char/Makefile @@ -14,7 +14,7 @@ obj-$(CONFIG_UNIX98_PTYS) += pty.o obj-y += misc.o obj-$(CONFIG_VT) += vt_ioctl.o vc_screen.o selection.o keyboard.o obj-$(CONFIG_BFIN_JTAG_COMM) += bfin_jtag_comm.o -obj-$(CONFIG_PTI_ROUTER) += ptirouter_ldisc.o +obj-$(CONFIG_TRACE_ROUTER) += n_tracerouter.o obj-$(CONFIG_CONSOLE_TRANSLATIONS) += consolemap.o consolemap_deftbl.o obj-$(CONFIG_HW_CONSOLE) += vt.o defkeymap.o obj-$(CONFIG_AUDIT) += tty_audit.o diff --git a/drivers/char/n_tracerouter.c b/drivers/char/n_tracerouter.c new file mode 100644 index 0000000..49cd229 --- /dev/null +++ b/drivers/char/n_tracerouter.c @@ -0,0 +1,202 @@ +/* + * n_tracerouter.c - PTI data router for JTAG data extration + * + * Copyright (C) Intel 2010 + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * The PTI router uses the Linux line discipline framework to route + * trace data coming from a HW Modem to a PTI (Parallel Trace Module) port. + * This is part of a solution for the P1149.7, compact JTAG, standard. + * + */ + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/ioctl.h> +#include <linux/tty.h> +#include <linux/tty_ldisc.h> +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/signal.h> +#include <linux/slab.h> +#include <asm-generic/bug.h> +#include <linux/pti.h> + +/* Other ldisc drivers use 65536 which basically means, + * 'I can always accept 64k' and flow control is off. + * This number is deemed appropriate for this driver. + */ + +#define RECEIVE_ROOM 65536 +#define DRIVERNAME "n_tracerouter" + +/** + * n_tracerouter_open() - Called when a tty is opened by a SW entity. + * @tty: terminal device to the ldisc. + * + * Return: + * 0 for success. + */ + +static int n_tracerouter_open(struct tty_struct *tty) +{ + tty->receive_room = RECEIVE_ROOM; + tty_driver_flush_buffer(tty); + return 0; +} + +/** + * n_tracerouter_close() - close connection + * @tty: terminal device to the ldisc. + * + * Called when a software entity wants to close a connection. + */ +static void n_tracerouter_close(struct tty_struct *tty) +{ + tty_driver_flush_buffer(tty); +} + +/** + * n_tracerouter_read() - read request from user space + * @tty: terminal device passed into the ldisc. + * @file: pointer to open file object. + * @buf: pointer to the data buffer that gets eventually returned. + * @nr: number of bytes of the data buffer that is returned. + * + * function that allows read() functionality in userspace. By default if this + * is not implemented it returns -EIO. This module is functioning like a + * router via n_tracerouter_receivebuf(), and there is no real requirement + * to implement this function. However, an error return value other than + * -EIO should be used just to show that there was an intent not to have + * this function implemented. Return value based on read() man pages. + * + * Return: + * -EINVAL + */ +ssize_t n_tracerouter_read(struct tty_struct *tty, struct file *file, + unsigned char *buf, size_t nr) { + return -EINVAL; +} + +/** + * n_tracerouter_write() - Function that allows write() in userspace. + * @tty: terminal device passed into the ldisc. + * @file: pointer to open file object. + * @buf: pointer to the data buffer that gets eventually returned. + * @nr: number of bytes of the data buffer that is returned. + * + * By default if this is not implemented, it returns -EIO. + * This should not be implemented, ever, because + * 1. this driver is functioning like a router via + * n_tracerouter_receivebuf() + * 2. No writes to HW will ever go through this line discpline driver. + * However, an error return value other than -EIO should be used + * just to show that there was an intent not to have this function + * implemented. Return value based on write() man pages. + * + * Return: + * -EINVAL + */ +ssize_t n_tracerouter_write(struct tty_struct *tty, struct file *file, + const unsigned char *buf, size_t nr) { + return -EINVAL; +} + +/** + * n_tracerouter_receivebuf() - Routing function for driver. + * @tty: terminal device passed into the ldisc. It's assumed + * tty will never be NULL. + * @cp: buffer, block of characters to be eventually read by + * someone, somewhere (user read() call or some kernel function). + * @fp: flag buffer. + * @count: number of characters (aka, bytes) in cp. + * + * This function takes the input buffer, cp, and passes it to + * an external API function for processing. + */ +static void n_tracerouter_receivebuf(struct tty_struct *tty, + const unsigned char *cp, + char *fp, int count) +{ + /* 71 is the master ID for modem messages */ + /* Only channel 0 for now */ + static struct masterchannel mc = {.master = 71, .channel = 0 }; + mipi_pti_writedata((void *) &mc, (u8 *)cp, count); +} + +/* Flush buffer is not impelemented as the ldisc has no internal buffering + * so the tty_driver_flush_buffer() is sufficient for this driver's needs. + */ + +static struct tty_ldisc_ops tty_n_tracerouter = { + .owner = THIS_MODULE, + .magic = TTY_LDISC_MAGIC, + .name = DRIVERNAME, + .open = n_tracerouter_open, + .close = n_tracerouter_close, + .read = n_tracerouter_read, + .write = n_tracerouter_write, + .receive_buf = n_tracerouter_receivebuf +}; + +/** + * n_tracerouter_init - module initialisation + * + * Registers this module as a line discipline driver. + * + * Return: + * 0 for success, any other value error. + */ +static int __init n_tracerouter_init(void) +{ + int retval; + + /* Note N_TRACEROUTER is defined in linux/tty.h */ + retval = tty_register_ldisc(N_TRACEROUTER, &tty_n_tracerouter); + if (retval < 0) + pr_err("%s: Registration failed: %d\n", + __func__, retval); + return retval; +} + +/** + * n_tracerouter_exit - - module unload + * + * Removes this module as a line discipline driver. + */ +static void __exit n_tracerouter_exit(void) +{ + int retval; + + retval = tty_unregister_ldisc(N_TRACEROUTER); + if (retval < 0) + pr_err("%s: Unregistration failed: %d\n", + __func__, retval); +} + +module_init(n_tracerouter_init); +module_exit(n_tracerouter_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Jay Freyensee"); +MODULE_ALIAS_LDISC(N_TRACEROUTER); +MODULE_DESCRIPTION("Trace router ldisc driver"); diff --git a/include/linux/tty.h b/include/linux/tty.h index 587fe31..cc35b24 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -49,7 +49,7 @@ #define N_V253 19 /* Codec control over voice modem */ #define N_CAIF 20 /* CAIF protocol for talking to modems */ #define N_GSM0710 21 /* GSM 0710 Mux */ -#define N_PTIR 22 /* PTI cJTAG data routing for MIPI P1149.7 */ +#define N_TRACEROUTER 22 /* Trace data routing for MIPI P1149.7 */ #define N_IFX_SPI 29 /* Mux mode for Infineon modems */ -- 1.6.6.1 _______________________________________________ MeeGo-kernel mailing list [email protected] http://lists.meego.com/listinfo/meego-kernel
