Re: [ patch 1/5] drivers/serial/jsm: new serial device driver

[Wen Xiong <wendyx@us.ibm.com>]

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Domen Puncer wrote:

>Just some nitpicking...
>
>  
>
Hi Domen, all,

Thanks for your comments. I  did some minor changes for patch1 based on 
Domen's comment.

Thanks,
wendy

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diff -Nuar linux-2.6.11.org/drivers/serial/jsm/jsm_driver.c linux-2.6.11.new/drivers/serial/jsm/jsm_driver.c
--- linux-2.6.11.org/drivers/serial/jsm/jsm_driver.c	1969-12-31 18:00:00.000000000 -0600
+++ linux-2.6.11.new/drivers/serial/jsm/jsm_driver.c	2005-03-14 11:13:08.143944608 -0600
@@ -0,0 +1,404 @@
+/************************************************************************
+ * 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/moduleparam.h>
+#include <linux/pci.h>
+
+#include "jsm.h"
+
+MODULE_AUTHOR("Digi International, http://www.digi.com");
+MODULE_DESCRIPTION("Driver for the Digi International Neo PCI based product line");
+MODULE_SUPPORTED_DEVICE("jsm");
+
+#define JSM_DRIVER_NAME "jsm"
+#define NR_PORTS	32 
+#define JSM_MINOR_START	0 
+
+struct uart_driver jsm_uart_driver = {
+	.owner		= THIS_MODULE,
+	.driver_name	= JSM_DRIVER_NAME,
+	.dev_name	= "ttyn", 
+	.major		= 253,
+	.minor		= JSM_MINOR_START, 
+	.nr		= NR_PORTS,
+	.cons		= NULL,
+};
+
+int jsm_debug;
+int jsm_rawreadok;
+module_param(jsm_debug, int, 0);
+module_param(jsm_rawreadok, int, 1);
+MODULE_PARM_DESC(jsm_debug, "Driver debugging level");
+MODULE_PARM_DESC(jsm_rawreadok, "Bypass flip buffers on input");
+
+/*
+ * Globals
+ */
+int		jsm_driver_state = DRIVER_INITIALIZED;
+spinlock_t	jsm_board_head_lock = SPIN_LOCK_UNLOCKED;
+LIST_HEAD(jsm_board_head);
+
+static struct pci_device_id jsm_pci_tbl[] = {
+	{ PCI_DEVICE (PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2DB9),	0,	0,	0 },
+	{ PCI_DEVICE (PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2DB9PRI),	0,	0,	1 },
+	{ PCI_DEVICE (PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2RJ45),	0,	0,	2 },
+	{ PCI_DEVICE (PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2RJ45PRI),	0,	0,	3 },
+	{ 0,}						/* 0 terminated list. */
+};
+MODULE_DEVICE_TABLE(pci, jsm_pci_tbl);
+
+static struct board_id jsm_Ids[] = {
+	{ PCI_DEVICE_NEO_2DB9_PCI_NAME,		2 },
+	{ PCI_DEVICE_NEO_2DB9PRI_PCI_NAME,	2 },
+	{ PCI_DEVICE_NEO_2RJ45_PCI_NAME,	2 },
+	{ PCI_DEVICE_NEO_2RJ45PRI_PCI_NAME,	2 },
+	{ NULL,					0 }
+};
+
+char *jsm_driver_state_text[] = {
+	"Driver Initialized",
+	"Driver Ready."
+};
+
+static int jsm_finalize_board_init(struct jsm_board *brd)
+{
+	int rc = 0;
+
+	jsm_printk(INIT, INFO, &brd->pci_dev, "start\n");
+
+	if (brd->irq) {
+		rc = request_irq(brd->irq, brd->bd_ops->intr, SA_INTERRUPT|SA_SHIRQ, "JSM", brd);
+
+		if (rc) {
+			printk(KERN_WARNING "Failed to hook IRQ %d\n",brd->irq);
+			brd->state = BOARD_FAILED;
+			brd->dpastatus = BD_NOFEP;
+			rc = -ENODEV;
+		} else
+			jsm_printk(INIT, INFO, &brd->pci_dev,
+				"Requested and received usage of IRQ %d\n", brd->irq);
+	}
+	return rc;
+}
+
+/*
+ * jsm_found_board()
+ *
+ * A board has been found, init it.
+ */
+static int jsm_found_board(struct pci_dev *pdev, int id)
+{
+	struct jsm_board *brd;
+	int i = 0;
+	int rc = 0;
+	struct list_head *tmp;
+	struct jsm_board *cur_board_entry;
+	unsigned long lock_flags;
+	int adapter_count = 0;
+	int retval;
+
+	brd = kmalloc(sizeof(struct jsm_board), GFP_KERNEL);
+	if (!brd) {
+		dev_err(&pdev->dev, "memory allocation for board structure failed\n");
+		return -ENOMEM;
+	}
+	memset(brd, 0, sizeof(struct jsm_board));
+
+	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);
+		if (cur_board_entry->boardnum != adapter_count) {
+			break;
+		}
+		adapter_count++;
+	}
+
+	list_add_tail(&brd->jsm_board_entry, &jsm_board_head);
+	spin_unlock_irqrestore(&jsm_board_head_lock, lock_flags);
+
+	/* store the info for the board we've found */
+	brd->boardnum = adapter_count;
+	brd->pci_dev = pdev;
+	brd->name = jsm_Ids[id].name;
+	brd->maxports = jsm_Ids[id].maxports;
+	brd->dpastatus = BD_NOFEP;
+	init_waitqueue_head(&brd->state_wait);
+
+	spin_lock_init(&brd->bd_lock);
+	spin_lock_init(&brd->bd_intr_lock);
+
+	brd->state = BOARD_FOUND;
+
+	for (i = 0; i < brd->maxports; i++)
+		brd->channels[i] = NULL;
+
+	/* store which revision we have */
+	pci_read_config_byte(pdev, PCI_REVISION_ID, &brd->rev);
+
+	brd->irq = pdev->irq;
+
+	switch(brd->pci_dev->device) {
+
+	case PCI_DEVICE_ID_NEO_2DB9:
+	case PCI_DEVICE_ID_NEO_2DB9PRI:
+	case PCI_DEVICE_ID_NEO_2RJ45:
+	case PCI_DEVICE_ID_NEO_2RJ45PRI:
+
+		/*
+		 * This chip is set up 100% when we get to it.
+		 * No need to enable global interrupts or anything. 
+		 */
+		brd->dpatype = T_NEO | T_PCIBUS;
+
+		jsm_printk(INIT, INFO, &brd->pci_dev,
+			"jsm_found_board - NEO adapter\n");
+
+		/* get the PCI Base Address Registers */
+		brd->membase	= pci_resource_start(pdev, 0);
+		brd->membase_end = pci_resource_end(pdev, 0);
+
+		if (brd->membase & 1)
+			brd->membase &= ~3;
+		else
+			brd->membase &= ~15;
+
+		/* Assign the board_ops struct */
+		brd->bd_ops = &jsm_neo_ops;
+
+		brd->bd_uart_offset = 0x200;
+		brd->bd_dividend = 921600;
+
+		brd->re_map_membase = ioremap(brd->membase, 0x1000);
+		jsm_printk(INIT, INFO, &brd->pci_dev,
+			"remapped mem: 0x%p\n", brd->re_map_membase);
+		if (!brd->re_map_membase) {
+			kfree(brd);
+			dev_err(&pdev->dev, "card has no PCI Memory resources, failing board.\n");
+			return -ENOMEM;
+		}
+		break;
+
+	default:
+		dev_err(&pdev->dev, "Did not find any compatible Neo or Classic PCI boards in system.\n");
+		kfree(brd);
+		return -ENXIO;
+	}
+
+	/*
+	 * Do tty device initialization.
+	 */
+	rc = jsm_finalize_board_init(brd);
+	if (rc < 0) {
+		dev_err(&pdev->dev, "Can't finalize board init (%d)\n", rc);
+		brd->state = BOARD_FAILED;
+		retval = -ENXIO;
+		goto failed0;
+	}
+
+	rc = jsm_tty_init(brd);
+	if (rc < 0) {
+		dev_err(&pdev->dev, "Can't init tty devices (%d)\n", rc);
+		brd->state = BOARD_FAILED;
+		retval = -ENXIO;
+		goto failed1;
+	}
+
+	rc = jsm_uart_port_init(brd);
+	if (rc < 0) {
+		dev_err(&pdev->dev, "Can't init uart port (%d)\n", rc);
+		brd->state = BOARD_FAILED;
+		retval = -ENXIO;
+		goto failed1;
+	}
+
+	brd->state = BOARD_READY;
+	brd->dpastatus = BD_RUNNING;
+
+	/* Log the information about the board */
+	dev_info(&pdev->dev, "board %d: %s (rev %d), irq %d\n",adapter_count, brd->name, brd->rev, brd->irq);
+
+	/*
+	 * allocate flip buffer for board.
+	 *
+	 * Okay to malloc with GFP_KERNEL, we are not at interrupt
+	 * context, and there are no locks held.
+	 */
+	brd->flipbuf = kmalloc(MYFLIPLEN, GFP_KERNEL);
+	if (!brd->flipbuf) {
+		dev_err(&pdev->dev, "memory allocation for flipbuf failed\n");
+		brd->state = BOARD_FAILED;
+		retval = -ENOMEM;
+		goto failed1;
+	}
+	memset(brd->flipbuf, 0, MYFLIPLEN);
+
+	jsm_create_driver_sysfiles(pdev->dev.driver);
+
+	wake_up_interruptible(&brd->state_wait);
+	return 0;
+failed1:
+	free_irq(brd->irq, brd);
+failed0:
+	kfree(brd);
+	iounmap(brd->re_map_membase);
+	return retval;
+}
+
+/* returns count (>= 0), or negative on error */
+static int jsm_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	int rc;
+
+	rc = pci_enable_device(pdev);
+	if (rc) {
+		dev_err(&pdev->dev, "Device enable FAILED\n");
+		return rc;
+	}
+
+	if ((rc = pci_request_regions(pdev, "jsm"))) {
+	dev_err(&pdev->dev, "pci_request_region FAILED\n");
+		pci_disable_device(pdev);
+		return rc;
+	}
+
+	if ((rc = jsm_found_board(pdev, ent->driver_data))) {
+		dev_err(&pdev->dev, "jsm_found_board FAILED\n");
+		pci_release_regions(pdev);
+		pci_disable_device(pdev);
+	 	return rc;
+	}
+	return rc;
+}
+
+
+/*
+ * jsm_cleanup_board()
+ *
+ * Free all the memory associated with a board
+ */
+static void jsm_cleanup_board(struct jsm_board *brd)
+{
+	int i = 0;
+
+	free_irq(brd->irq, brd);
+	iounmap(brd->re_map_membase);
+
+	/* Free all allocated channels structs */
+	for (i = 0; i < brd->maxports; i++) {
+		if (brd->channels[i]) {
+			if (brd->channels[i]->ch_rqueue)
+				kfree(brd->channels[i]->ch_rqueue);
+			if (brd->channels[i]->ch_equeue)
+				kfree(brd->channels[i]->ch_equeue);
+			if (brd->channels[i]->ch_wqueue)
+				kfree(brd->channels[i]->ch_wqueue);
+			kfree(brd->channels[i]);
+		}
+	}
+
+	pci_release_regions(brd->pci_dev);
+	pci_disable_device(brd->pci_dev);
+	kfree(brd->flipbuf);
+	kfree(brd);
+}
+
+static void jsm_remove_one(struct pci_dev *dev)
+{
+	unsigned long lock_flags;
+	struct list_head *tmp;
+	struct jsm_board *brd;
+
+	spin_lock_irqsave(&jsm_board_head_lock, lock_flags);
+	list_for_each(tmp, &jsm_board_head) {
+		brd = list_entry(tmp, struct jsm_board,
+					jsm_board_entry);
+		if ( brd != NULL && brd->pci_dev == dev) {
+			jsm_remove_uart_port(brd);
+			jsm_cleanup_board(brd);
+			list_del(&brd->jsm_board_entry);
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&jsm_board_head_lock, lock_flags);
+	return;
+}
+
+struct pci_driver jsm_driver = {
+	.name		= "jsm",
+	.probe		= jsm_init_one,
+	.id_table	= jsm_pci_tbl,
+	.remove		= __devexit_p(jsm_remove_one),
+};
+
+/*
+ * jsm_init_module()
+ *
+ * Module load.  This is where it all starts.
+ */
+static int __init jsm_init_module(void)
+{
+	int rc = 0;
+
+	printk(KERN_INFO "%s, Digi International Part Number %s\n",
+			JSM_VERSION, JSM_VERSION);
+
+	/*
+	 * Initialize global stuff
+	 */
+
+	rc = uart_register_driver(&jsm_uart_driver);
+	if (rc < 0) {
+		return rc;
+	}
+
+	rc = pci_register_driver(&jsm_driver);
+	if (rc < 0) {
+		uart_unregister_driver(&jsm_uart_driver);
+		return rc;
+	}
+	jsm_driver_state = DRIVER_READY;
+
+	return rc;
+}
+
+module_init(jsm_init_module);
+
+/*
+ * jsm_exit_module()
+ *
+ * Module unload.  This is where it all ends.
+ */
+static void __exit jsm_exit_module(void)
+{
+	jsm_remove_driver_sysfiles(&jsm_driver.driver);
+
+	pci_unregister_driver(&jsm_driver);
+
+	uart_unregister_driver(&jsm_uart_driver);
+}
+module_exit(jsm_exit_module);
+MODULE_LICENSE("GPL");