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SubjectRe: [ patch 4/7] drivers/serial/jsm: new serial device driver
Greg KH wrote:

>On Fri, Mar 04, 2005 at 04:08:17PM -0500, Wen Xiong wrote:
>
>
>>+int get_jsm_board_number(void)
>>+{
>>+ struct list_head *tmp;
>>+ struct jsm_board *cur_board_entry;
>>+ int adapter_count = 0;
>>+ u64 lock_flags;
>>+
>>+ spin_lock_irqsave(&jsm_board_head_lock, lock_flags);
>>+ list_for_each(tmp, &jsm_board_head) {
>>+ cur_board_entry =
>>+ list_entry(tmp, struct jsm_board,
>>+ jsm_board_entry);
>>+ adapter_count++;
>>+ }
>>+ spin_unlock_irqrestore(&jsm_board_head_lock, lock_flags);
>>+
>>+ return adapter_count;
>>+}
>>
>>
>
>Should this be static?
>
>And it's returning the number of boards, not the current board number,
>right?
>
>And you have a indenting error in the list_for_each() section...
>
>
>
>>+static ssize_t jsm_driver_version_show(struct device_driver *ddp, char *buf)
>>+{
>>+ return snprintf(buf, PAGE_SIZE, "jsm_version: %s\n", "jsm: 1.1-1-INKERNEL");
>>
>>
>
>Shouldn't that value also be in MODULE_VERSION()? And if so, it should
>be a #define somewhere.
>
>Also, don't put "jsm:" in your sysfs files, the file name describes what
>the value should be. That goes for a lot of your sysfs files.
>
>
>
>>+static ssize_t jsm_driver_debug_show(struct device_driver *ddp, char *buf)
>>+{
>>+ return snprintf(buf, PAGE_SIZE, "0x%x\n", debug);
>>+}
>>
>>
>
>"debug" is not a nice variable to have in the global namespace :(
>
>Also, why not just make this a module paramater, that way it can be
>modified through that interface, and you don't have to create your own?
>
>
>
>>+#define JSM_VERIFY_BOARD(p, bd) \
>>+ if (!p) \
>>+ return 0; \
>>+ bd = (struct jsm_board *)dev_get_drvdata(p); \
>>
>>
>
>Cast is not needed.
>
>
>
>>+ if (!bd) \
>>+ return 0; \
>>+ if (bd->state != BOARD_READY) \
>>+ return 0; \
>>
>>
>
>Don't break out of functions from within a macro. Will cause headaches
>for people reviewing your code in the future.
>
>And shouldn't you be returning an error if one of these checks fail?
>
>
>
>>+static ssize_t jsm_ports_state_show(struct device *p, char *buf)
>>+{
>>+ struct jsm_board *bd;
>>+ int count = 0;
>>+ int i = 0;
>>+
>>+ JSM_VERIFY_BOARD(p, bd);
>>+
>>+ for (i = 0; i < bd->nasync; i++) {
>>+ count += snprintf(buf + count, PAGE_SIZE - count,
>>+ "%d %s\n", bd->channels[i]->ch_portnum,
>>+ bd->channels[i]->ch_open_count ? "Open" : "Closed");
>>+ }
>>+ return count;
>>
>>
>
>No, make this a per-port value. You are showing more than one value in
>a single file. You do this for a few other sysfs files :(
>
>And who cares about this value?
>
>
>
>>+static ssize_t jsm_ports_baud_show(struct device *p, char *buf)
>>+{
>>+ struct jsm_board *bd;
>>+ int count = 0;
>>+ int i = 0;
>>+
>>+ JSM_VERIFY_BOARD(p, bd);
>>+
>>+ for (i = 0; i < bd->nasync; i++) {
>>+ count += snprintf(buf + count, PAGE_SIZE - count,
>>+ "%d %d\n", bd->channels[i]->ch_portnum, bd->channels[i]->ch_old_baud);
>>+ }
>>+ return count;
>>+}
>>+static DEVICE_ATTR(ports_baud, S_IRUSR, jsm_ports_baud_show, NULL);
>>
>>
>
>What's wrong with the standard tty ioctls that return this value, and
>the other values you are exporting through sysfs? What is all of this
>data needed for?
>
>
>
>>+#define JSM_VERIFY_CHANNEL(p, ch) \
>>+ if (!p) \
>>+ return 0; \
>>+ ch = (struct jsm_channel *)class_get_devdata(p);\
>>+ if (!ch) \
>>+ return 0; \
>>+ if (ch->ch_bd->state != BOARD_READY) \
>>+ return 0; \
>>
>>
>
>Again, don't put return in a macro, and return an error if there really
>is one.
>
>thanks,
>
>greg k-h
>-
>To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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>More majordomo info at http://vger.kernel.org/majordomo-info.html
>Please read the FAQ at http://www.tux.org/lkml/
>
>
>
Hi Greg,
Since some tools in Digi need some new ioctls, so I still keep some new
ioctls.

Thanks for your reviewing!
wendy
diff -Nuar linux-2.6.11.org/drivers/serial/jsm/jsm_sysfs.c linux-2.6.11.new/drivers/serial/jsm/jsm_sysfs.c
--- linux-2.6.11.org/drivers/serial/jsm/jsm_sysfs.c 1969-12-31 18:00:00.000000000 -0600
+++ linux-2.6.11.new/drivers/serial/jsm/jsm_sysfs.c 2005-03-07 16:27:47.293998096 -0600
@@ -0,0 +1,289 @@
+/************************************************************************
+ * Copyright 2003 Digi International (www.digi.com)
+ *
+ * Copyright (C) 2004 IBM Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; 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., 59 * Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ *
+ * Contact Information:
+ * Scott H Kilau <Scott_Kilau@digi.com>
+ * Wendy Xiong <wendyx@us.ltcfwd.linux.ibm.com>
+ *
+ ***********************************************************************/
+
+#include <linux/device.h>
+#include <linux/serial_reg.h>
+
+#include "jsm_driver.h"
+
+static struct class_simple *jsm_tty_class;
+
+int jsm_total_boardnum(void)
+{
+ struct list_head *tmp;
+ struct jsm_board *cur_board_entry;
+ int adapter_count = 0;
+ u64 lock_flags;
+
+ spin_lock_irqsave(&jsm_board_head_lock, lock_flags);
+ list_for_each(tmp, &jsm_board_head) {
+ cur_board_entry =
+ list_entry(tmp, struct jsm_board,
+ jsm_board_entry);
+ adapter_count++;
+ }
+ spin_unlock_irqrestore(&jsm_board_head_lock, lock_flags);
+
+ return adapter_count;
+}
+
+static ssize_t jsm_driver_version_show(struct device_driver *ddp, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "jsm_version: %s\n", JSM_VERSION);
+}
+static DRIVER_ATTR(version, S_IRUSR, jsm_driver_version_show, NULL);
+
+static ssize_t jsm_driver_boards_show(struct device_driver *ddp, char *buf)
+{
+ int adapter_count = 0;
+ adapter_count = jsm_total_boardnum();
+ return snprintf(buf, PAGE_SIZE, "jsm_board_number: %d\n", adapter_count);
+}
+static DRIVER_ATTR(boards, S_IRUSR, jsm_driver_boards_show, NULL);
+
+static ssize_t jsm_driver_state_show(struct device_driver *ddp, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "jsm_state: %s\n", jsm_driver_state_text[jsm_driver_state]);
+}
+static DRIVER_ATTR(state, S_IRUSR, jsm_driver_state_show, NULL);
+
+static ssize_t jsm_driver_debug_show(struct device_driver *ddp, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "0x%x\n", jsm_debug);
+}
+static DRIVER_ATTR(debug, S_IRUSR, jsm_driver_debug_show, NULL);
+
+
+static ssize_t jsm_driver_rawreadok_show(struct device_driver *ddp, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "0x%x\n", jsm_rawreadok);
+}
+static DRIVER_ATTR(rawreadok, S_IRUSR, jsm_driver_rawreadok_show, NULL);
+
+void jsm_create_driver_sysfiles(struct device_driver *driverfs)
+{
+ driver_create_file(driverfs, &driver_attr_version);
+ driver_create_file(driverfs, &driver_attr_boards);
+ driver_create_file(driverfs, &driver_attr_debug);
+ driver_create_file(driverfs, &driver_attr_rawreadok);
+ driver_create_file(driverfs, &driver_attr_state);
+}
+
+void jsm_remove_driver_sysfiles(struct device_driver *driverfs)
+{
+ driver_remove_file(driverfs, &driver_attr_version);
+ driver_remove_file(driverfs, &driver_attr_boards);
+ driver_remove_file(driverfs, &driver_attr_debug);
+ driver_remove_file(driverfs, &driver_attr_rawreadok);
+ driver_remove_file(driverfs, &driver_attr_state);
+}
+
+int jsm_tty_class_init(void)
+{
+ jsm_tty_class = class_simple_create(THIS_MODULE, "jsm_tty");
+ if (IS_ERR(jsm_tty_class))
+ return PTR_ERR(jsm_tty_class);
+
+ return 0;
+}
+
+int jsm_tty_class_destroy(void)
+{
+ if (IS_ERR(jsm_tty_class))
+ return PTR_ERR(jsm_tty_class);
+
+ class_simple_destroy(jsm_tty_class);
+ return 0;
+}
+
+static ssize_t jsm_tty_state_show(struct class_device *class_dev, char *buf)
+{
+ struct jsm_channel *ch;
+
+ if (class_dev) {
+ ch = class_get_devdata(class_dev);
+ if ( ch && (ch->ch_bd->state == BOARD_READY))
+ return snprintf(buf, PAGE_SIZE, "%s\n", ch->ch_open_count ? "Open" : "Closed");
+ }
+
+ return -EINVAL;
+}
+static CLASS_DEVICE_ATTR(state, S_IRUGO, jsm_tty_state_show, NULL);
+
+
+static ssize_t jsm_tty_baud_show(struct class_device *class_dev, char *buf)
+{
+ struct jsm_channel *ch;
+
+ if (class_dev) {
+ ch = class_get_devdata(class_dev);
+ if ( ch && (ch->ch_bd->state == BOARD_READY))
+ return snprintf(buf, PAGE_SIZE, "%d\n", ch->ch_old_baud);
+ }
+
+ return -EINVAL;
+}
+static CLASS_DEVICE_ATTR(baud, S_IRUGO, jsm_tty_baud_show, NULL);
+
+static ssize_t jsm_tty_msignals_show(struct class_device *class_dev, char *buf)
+{
+ struct jsm_channel *ch;
+
+ if (class_dev) {
+ ch = class_get_devdata(class_dev);
+ if ( ch && (ch->ch_bd->state == BOARD_READY))
+ if (ch->ch_open_count) {
+ return snprintf(buf, PAGE_SIZE, "%s %s %s %s %s %s\n",
+ (ch->ch_mostat & UART_MCR_RTS) ? "RTS" : "",
+ (ch->ch_mistat & UART_MSR_CTS) ? "CTS" : "",
+ (ch->ch_mostat & UART_MCR_DTR) ? "DTR" : "",
+ (ch->ch_mistat & UART_MSR_DSR) ? "DSR" : "",
+ (ch->ch_mistat & UART_MSR_DCD) ? "DCD" : "",
+ (ch->ch_mistat & UART_MSR_RI) ? "RI" : "");
+ }
+ }
+
+ return -EINVAL;
+}
+static CLASS_DEVICE_ATTR(msignals, S_IRUGO, jsm_tty_msignals_show, NULL);
+
+static ssize_t jsm_tty_iflag_show(struct class_device *class_dev, char *buf)
+{
+ struct jsm_channel *ch;
+
+ if (class_dev) {
+ ch = class_get_devdata(class_dev);
+ if ( ch && (ch->ch_bd->state == BOARD_READY))
+ return snprintf(buf, PAGE_SIZE, "%x\n", ch->ch_c_iflag);
+ }
+
+ return -EINVAL;
+}
+static CLASS_DEVICE_ATTR(iflag, S_IRUGO, jsm_tty_iflag_show, NULL);
+
+
+static ssize_t jsm_tty_cflag_show(struct class_device *class_dev, char *buf)
+{
+ struct jsm_channel *ch;
+
+ if (class_dev) {
+ ch = class_get_devdata(class_dev);
+ if ( ch && (ch->ch_bd->state == BOARD_READY))
+ return snprintf(buf, PAGE_SIZE, "%x\n", ch->ch_c_cflag);
+ }
+
+ return -EINVAL;
+}
+static CLASS_DEVICE_ATTR(cflag, S_IRUGO, jsm_tty_cflag_show, NULL);
+
+static ssize_t jsm_tty_oflag_show(struct class_device *class_dev, char *buf)
+{
+ struct jsm_channel *ch;
+
+ if (class_dev) {
+ ch = class_get_devdata(class_dev);
+ if ( ch && (ch->ch_bd->state == BOARD_READY))
+ return snprintf(buf, PAGE_SIZE, "%x\n", ch->ch_c_oflag);
+ }
+
+ return -EINVAL;
+}
+static CLASS_DEVICE_ATTR(oflag, S_IRUGO, jsm_tty_oflag_show, NULL);
+
+static ssize_t jsm_tty_lflag_show(struct class_device *class_dev, char *buf)
+{
+ struct jsm_channel *ch;
+
+ if (class_dev) {
+ ch = class_get_devdata(class_dev);
+ if ( ch && (ch->ch_bd->state == BOARD_READY))
+ return snprintf(buf, PAGE_SIZE, "%x\n", ch->ch_c_lflag);
+ }
+
+ return -EINVAL;
+}
+static CLASS_DEVICE_ATTR(lflag, S_IRUGO, jsm_tty_lflag_show, NULL);
+
+static ssize_t jsm_tty_rxcount_show(struct class_device *class_dev, char *buf)
+{
+ struct jsm_channel *ch;
+
+ if (class_dev) {
+ ch = class_get_devdata(class_dev);
+ if ( ch && (ch->ch_bd->state == BOARD_READY))
+ return snprintf(buf, PAGE_SIZE, "%ld\n", ch->ch_rxcount);
+ }
+
+ return -EINVAL;
+}
+static CLASS_DEVICE_ATTR(rxcount, S_IRUGO, jsm_tty_rxcount_show, NULL);
+
+static ssize_t jsm_tty_txcount_show(struct class_device *class_dev, char *buf)
+{
+ struct jsm_channel *ch;
+
+ if (class_dev) {
+ ch = class_get_devdata(class_dev);
+ if ( ch && (ch->ch_bd->state == BOARD_READY))
+ return snprintf(buf, PAGE_SIZE, "%ld\n", ch->ch_txcount);
+ }
+
+ return -EINVAL;
+}
+static CLASS_DEVICE_ATTR(txcount, S_IRUGO, jsm_tty_txcount_show, NULL);
+
+void jsm_tty_register_device(struct jsm_channel *ch, struct device *device)
+{
+ struct class_device *jsm_class_member;
+ dev_t dev;
+
+ dev = MKDEV(ch->ch_bd->jsm_serial_major,
+ ch->ch_portnum + ch->ch_bd->boardnum * 2);
+
+ jsm_class_member = class_simple_device_add(jsm_tty_class, dev, device,
+ "ttyn%d", ch->ch_portnum + ch->ch_bd->boardnum*2);
+
+ if (IS_ERR(jsm_class_member))
+ return;
+
+ class_set_devdata(jsm_class_member, ch);
+ class_device_create_file(jsm_class_member, &class_device_attr_state);
+ class_device_create_file(jsm_class_member, &class_device_attr_baud);
+ class_device_create_file(jsm_class_member, &class_device_attr_msignals);
+ class_device_create_file(jsm_class_member, &class_device_attr_iflag);
+ class_device_create_file(jsm_class_member, &class_device_attr_cflag);
+ class_device_create_file(jsm_class_member, &class_device_attr_oflag);
+ class_device_create_file(jsm_class_member, &class_device_attr_lflag);
+ class_device_create_file(jsm_class_member, &class_device_attr_rxcount);
+ class_device_create_file(jsm_class_member, &class_device_attr_txcount);
+}
+
+void jsm_tty_unregister_device(struct jsm_channel *ch)
+{
+
+ class_simple_device_remove(MKDEV(ch->ch_bd->jsm_serial_major,
+ ch->ch_portnum + ch->ch_bd->boardnum * 2));
+}
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