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Date: Tue, 19 Apr 2011 16:15:09 -0700
From: Randy Dunlap <rdunlap@xenotime.net>
To: james_p_freyensee@linux.intel.com
Cc: gregkh@suse.de, linux-kernel@vger.kernel.org, suhail.ahmed@intel.com,
        christophe.guerard@intel.com
Subject: Re: [PATCH 3/4] Intel PTI implementaiton of MIPI 1149.7.
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	<1303253889-10074-4-git-send-email-james_p_freyensee@linux.intel.com>
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On Tue, 19 Apr 2011 15:58:08 -0700 james_p_freyensee@linux.intel.com wrote:


> diff --git a/drivers/misc/pti.c b/drivers/misc/pti.c
> new file mode 100644
> index 0000000..f3a2980
> --- /dev/null
> +++ b/drivers/misc/pti.c
> @@ -0,0 +1,898 @@
> +/*
> + *  pti.c - PTI driver for cJTAG 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.
> + *
> + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> + *
> + * The PTI (Parallel Trace Interface) driver directs trace data routed from
> + * various parts in the system out through the Intel Penwell PTI port and
> + * out of the mobile device for analysis with a debugging tool
> + * (Lauterbach, Fido). This is part of a solution for the MIPI P1149.7,
> + * compact JTAG, standard.
> + */
> +
> +#include <linux/init.h>
> +#include <linux/sched.h>
> +#include <linux/interrupt.h>
> +#include <linux/console.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/tty.h>
> +#include <linux/tty_driver.h>
> +#include <linux/pci.h>
> +#include <linux/mutex.h>
> +#include <linux/miscdevice.h>
> +#include <linux/pti.h>
> +
> +#define DRIVERNAME		"pti"
> +#define PCINAME			"pciPTI"
> +#define TTYNAME			"ttyPTI"
> +#define CHARNAME		"pti"
> +#define PTITTY_MINOR_START	0
> +#define PTITTY_MINOR_NUM	2
> +#define MAX_APP_IDS		16   /* 128 channel ids / u8 bit size */
> +#define MAX_OS_IDS		16   /* 128 channel ids / u8 bit size */
> +#define MAX_MODEM_IDS		16   /* 128 channel ids / u8 bit size */
> +#define MODEM_BASE_ID		71   /* modem master ID address    */
> +#define CONTROL_ID		72   /* control master ID address  */
> +#define CONSOLE_ID		73   /* console master ID address  */
> +#define OS_BASE_ID		74   /* base OS master ID address  */
> +#define APP_BASE_ID		80   /* base App master ID address */
> +#define CONTROL_FRAME_LEN	32   /* PTI control frame maximum size */
> +#define USER_COPY_SIZE		8192 /* 8Kb buffer for user space copy */
> +#define APERTURE_14		0x3800000 /* offset to first OS write addr */
> +#define APERTURE_LEN		0x400000  /* address length */
> +
> +struct pti_tty {
> +	struct pti_masterchannel *mc;
> +};
> +
> +struct pti_dev {
> +	struct tty_port port;
> +	unsigned long pti_addr;
> +	unsigned long aperture_base;
> +	void __iomem *pti_ioaddr;
> +	u8 ia_app[MAX_APP_IDS];
> +	u8 ia_os[MAX_OS_IDS];
> +	u8 ia_modem[MAX_MODEM_IDS];
> +};
> +
> +/*
> +   This protects access to ia_app, ia_os, and ia_modem,
> +   which keeps track of channels allocated in
> +   an aperture write id.
> +*/

Use normal multi-line comment format:

/*
 * line1
 * line2
 */

> +static DEFINE_MUTEX(alloclock);
> +
> +static struct pci_device_id pci_ids[] __devinitconst = {
> +		{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x82B) },
> +		{0}
> +};
> +
> +static struct tty_driver *pti_tty_driver;
> +
> +static struct pti_dev *drv_data;
> +
> +static unsigned int pti_console_channel;
> +static unsigned int pti_control_channel;
> +
> +#define DTS 0x30		/* offset for last dword of a PTI message */
> +
> +/**
> + *  pti_write_to_aperture() - THE private write function to PTI HW.

THE ?

> + *  @mc: The 'aperture'. It's part of a write address that holds
> + *       a master and channel ID.
> + *  @buf: Data being written to the HW that will ultimately be seen
> + *        in a debugging tool (Fido, Lauterbach).
> + *  @len: Size of buffer.
> + *
> + *  Since each aperture is specified by a unique
> + *  master/channel ID, no two processes will be writing
> + *  to the same aperture at the same time so no lock is required. The
> + *  PTI-Output agent will send these out in the order that they arrived, and
> + *  thus, it will intermix these messages. The debug tool can then later
> + *  regroup the appropriate message segments together reconstituting each
> + *  message.
> + */
> +static void pti_write_to_aperture(struct pti_masterchannel *mc,
> +				  u8 *buf,
> +				  int len)
> +{
> +	int dwordcnt, final, i;
> +	u32 ptiword;
> +	u8 *p;
> +	u32 __iomem *aperture;
> +
> +	p = buf;
> +
> +	/*
> +	   calculate the aperture offset from the base using the master and
> +	   channel id's.
> +	*/

comment style (see Documentation/CodingStyle, section 8)


> +	aperture = drv_data->pti_ioaddr + (mc->master << 15)
> +		+ (mc->channel << 8);
> +
> +	dwordcnt = len >> 2;
> +	final = len - (dwordcnt << 2);		/* final = trailing bytes */
> +	if (final == 0 && dwordcnt != 0) {	/* always have a final dword */
> +		final += 4;
> +		dwordcnt--;
> +	}
> +
> +	for (i = 0; i < dwordcnt; i++) {
> +		ptiword = be32_to_cpu(*(u32 *)p);
> +		p += 4;
> +		iowrite32(ptiword, aperture);
> +	}
> +
> +	aperture += DTS;		/* adding DTS signals that is EOM */
> +
> +	ptiword = 0;
> +	for (i = 0; i < final; i++)
> +		ptiword |= *p++ << (24-(8*i));
> +
> +	iowrite32(ptiword, aperture);
> +	return;
> +}
> +
> +/**
> + *  pti_control_frame_built_and_sent() - control frame build and send function.
> + *  @mc: The master / channel structure on which the function built a control
> + *  frame.
> + *
> + *  To be able to post process the PTI contents on host side, a control frame
> + *  is added before sending any PTI content. So the host side knows on
> + *  each PTI frame the name of the thread using a dedicated master / channel.
> + *  This function builds this frame and sends it to a master ID CONTROL_ID.
> + *  The overhead is only 32 bytes since the driver only writes to HW
> + *  in 32 byte chunks.
> + */
> +
> +static void pti_control_frame_built_and_sent(struct pti_masterchannel *mc)
> +{
> +	struct pti_masterchannel mccontrol = {.master = CONTROL_ID,
> +					      .channel = 0};
> +	const char *control_format = "%3d %3d %s";
> +
> +	char comm[sizeof(current->comm) + 1];
> +	u8 control_frame[CONTROL_FRAME_LEN];
> +
> +	if (!in_interrupt())
> +		get_task_comm(comm, current);
> +	else
> +		strcpy(comm, "Interrupt");
> +
> +	/* Ensure our buffer is zero terminated */
> +	comm[sizeof(current->comm)] = 0;
> +
> +	mccontrol.channel = pti_control_channel;
> +	pti_control_channel = (pti_control_channel + 1) & 0x7f;
> +
> +	snprintf(control_frame, CONTROL_FRAME_LEN, control_format, mc->master,
> +		mc->channel, comm);
> +	pti_write_to_aperture(&mccontrol, control_frame, strlen(control_frame));
> +}
> +
> +/**
> + *  pti_write_full_frame_to_aperture() - high level function to write to PTI
> + *  @mc: The 'aperture'. It's part of a write address that holds
> + *       a master and channel ID.
> + *  @buf: Data being written to the HW that will ultimately be seen
> + *        in a debugging tool (Fido, Lauterbach).
> + *  @len: Size of buffer.
> + *
> + *  All threads sending data (either console, user space application, ...)
> + *  are calling the high level function to write to PTI meaning that it is
> + *  possible to add a control frame before sending the content.
> + */
> +static void pti_write_full_frame_to_aperture(struct pti_masterchannel *mc,
> +						const unsigned char *buf,
> +						int len)
> +{
> +	pti_control_frame_built_and_sent(mc);
> +	pti_write_to_aperture(mc, (u8 *)buf, len);
> +}
> +
> +
> +/**
> + * getID(): Allocate a master and channel ID.

 * getID() - Allocate a master and channel ID

> + *
> + * @IDarray:

needs explanatory text

> + * @max_IDS: The max amount of available write IDs to use.
> + * @baseID:  The starting SW channel ID, based on the Intel
> + *           PTI arch.
> + *
> + * @return: pti_masterchannel struct containing master, channel ID address,

No '@' on "return".


> + * or 0 for error.
> + *
> + * Each bit in the arrays ia_app and ia_os correspond to a master and
> + * channel id. The bit is one if the id is taken and 0 if free. For
> + * every master there are 128 channel id's.
> + */
> +static struct pti_masterchannel *getID(u8 *IDarray, int max_IDS, int baseID)
> +{
> +	struct pti_masterchannel *mc;
> +	int i, j, mask;
> +
> +	mc = kmalloc(sizeof(struct pti_masterchannel), GFP_KERNEL);
> +	if (mc == NULL)
> +		return NULL;
> +
> +	/* look for a byte with a free bit */
> +	for (i = 0; i < max_IDS; i++)
> +		if (IDarray[i] != 0xff)
> +			break;
> +	if (i == max_IDS) {
> +		kfree(mc);
> +		return NULL;
> +	}
> +	/* find the bit in the 128 possible channel opportunities */
> +	mask = 0x80;
> +	for (j = 0; j < 8; j++) {
> +		if ((IDarray[i] & mask) == 0)
> +			break;
> +		mask >>= 1;
> +	}
> +
> +	/* grab it */
> +	IDarray[i] |= mask;
> +	mc->master  = baseID;
> +	mc->channel = ((i & 0xf)<<3) + j;
> +	/* write new master Id / channel Id allocation to channel control */
> +	pti_control_frame_built_and_sent(mc);
> +	return mc;
> +}
> +
> +/*
> +	The following three functions:
> +	pti_request_mastercahannel(), mipi_release_masterchannel()
> +	and pti_writedata() are an API for other kernel drivers to
> +	access PTI.
> +*/

multi-line comment style.

> +
> +/**
> + * pti_request_masterchannel() - Kernel API function used to allocate
> + *                                a master, channel ID address to write to
> + *                                PTI HW.
> + * @type: 0- request Application  master, channel aperture ID write address.
> + *        1- request OS master, channel aperture ID write address.
> + *        2- request Modem master, channel aperture ID write
> + *           address.
> + *        Other values, error.
> + * @return: pti_masterchannel struct or 0 for error.

No '@' on "return".

> + *
> + */
> +struct pti_masterchannel *pti_request_masterchannel(u8 type)
> +{
> +	struct pti_masterchannel *mc;
> +
> +	mutex_lock(&alloclock);
> +
> +	switch (type) {
> +
> +	case 0:
> +		mc = getID(drv_data->ia_app, MAX_APP_IDS, APP_BASE_ID);
> +		break;
> +
> +	case 1:
> +		mc = getID(drv_data->ia_os, MAX_OS_IDS, OS_BASE_ID);
> +		break;
> +
> +	case 2:
> +		mc = getID(drv_data->ia_modem, MAX_MODEM_IDS, MODEM_BASE_ID);
> +		break;
> +	default:
> +		mc = NULL;
> +	}
> +
> +	mutex_unlock(&alloclock);
> +	return mc;
> +}
> +EXPORT_SYMBOL_GPL(pti_request_masterchannel);
> +
> +/**
> + * pti_release_masterchannel() - Kernel API function used to release
> + *                                a master, channel ID address
> + *                                used to write to PTI HW.
> + * @mc: master, channel apeture ID address to be released.
> + *
> + */
> +void pti_release_masterchannel(struct pti_masterchannel *mc)
> +{
> +	u8 master, channel, i;
> +
> +	mutex_lock(&alloclock);
> +
> +	if (mc) {
> +		master = mc->master;
> +		channel = mc->channel;
> +
> +		if (master == APP_BASE_ID) {
> +			i = channel >> 3;
> +			drv_data->ia_app[i] &=  ~(0x80>>(channel & 0x7));
> +		} else if (master == OS_BASE_ID) {
> +			i = channel >> 3;
> +			drv_data->ia_os[i] &= ~(0x80>>(channel & 0x7));
> +		} else {
> +			i = channel >> 3;
> +			drv_data->ia_modem[i] &= ~(0x80>>(channel & 0x7));
> +		}
> +
> +		kfree(mc);
> +	}
> +
> +	mutex_unlock(&alloclock);
> +}
> +EXPORT_SYMBOL_GPL(pti_release_masterchannel);
> +
> +/**
> + * pti_writedata() - Kernel API function used to write trace
> + *                   debugging data to PTI HW.
> + *
> + * @mc:    Master, channel aperture ID address to write to.
> + *         Null value will return with no write occurring.
> + * @buf:   Trace debuging data to write to the PTI HW.
> + *         Null value will return with no write occurring.
> + * @count: Size of buf. Value of 0 or a negative number will
> + *         retrn with no write occuring.

	      return with no write occurring.

or maybe the @count/@len parameters should be size_t so that they cannot
be negative.

> + */
> +void pti_writedata(struct pti_masterchannel *mc, u8 *buf, int count)
> +{
> +	/*
> +	   since this function is exported, this is treated like an
> +	   API function, thus, all parameters should
> +	   be checked for validity.
> +	*/

comment style.

> +	if ((mc != NULL) && (buf != NULL) && (count > 0))
> +		pti_write_to_aperture(mc, buf, count);
> +	return;
> +}
> +EXPORT_SYMBOL_GPL(pti_writedata);
> +
> +static void __devexit pti_pci_remove(struct pci_dev *pdev)
> +{
> +	struct pti_dev *drv_data;
> +
> +	drv_data = pci_get_drvdata(pdev);
> +	if (drv_data != NULL) {
> +		pci_iounmap(pdev, drv_data->pti_ioaddr);
> +		pci_set_drvdata(pdev, NULL);
> +		kfree(drv_data);
> +		pci_release_region(pdev, 1);
> +		pci_disable_device(pdev);
> +	}
> +}
> +
> +/*
> +   for the tty_driver_*() basic function descriptions, see tty_driver.h.
> +   Specific header comments made for PTI-related specifics.
> +*/

comment style.

> +
> +/**
> + * pti_tty_driver_open()- Open an Application master, channel aperture
> + * ID to the PTI device via tty device.
> + *
> + * @param tty: tty interface.
> + * @param filp: filp interface pased to tty_port_open() call.

drop "param".  Just use:

 * @tty: <text>
 * @filp: <text>

> + *
> + * @return int : Success = 0, otherwise fail.

No '@' on "return".


> + *
> + * The main purpose of using the tty device interface is for
> + * each tty port to have a unique PTI write aperture.  In an
> + * example use case, ttyPTI0 gets syslogd and an APP aperture
> + * ID and ttyPTI1 is where the n_tracesink ldisc hooks to route
> + * modem messages into PTI.  Modem trace data does not have to
> + * go to ttyPTI1, but ttyPTI0 and ttyPTI1 do need to be distinct
> + * master IDs.  These messages go through the PTI HW and out of
> + * the handheld platform and to the Fido/Lauterbach device.
> + */
> +static int pti_tty_driver_open(struct tty_struct *tty, struct file *filp)
> +{
> +	int ret = 0;
> +
> +	/*
> +	   we actually want to allocate a new channel per open, per
> +	   system arch.  HW gives more than plenty channels for a single
> +	   system task to have its own channel to write trace data. This
> +	   also removes a locking requirement for the actual write
> +	   procedure.
> +	*/

comment style.

> +	ret = tty_port_open(&drv_data->port, tty, filp);
> +
> +	return ret;
> +}
> +
> +/**
> + * pti_tty_driver_close()- close tty device and release Application
> + * master, channel aperture ID to the PTI device via tty device.
> + *
> + * @param tty: tty interface.
> + * @param filp: filp interface pased to tty_port_close() call.

Incorrect kernel-doc notation.  See Documentation/kernel-doc-nano-HOWTO.txt.

> + *
> + * The main purpose of using the tty device interface is to route
> + * syslog daemon messages to the PTI HW and out of the handheld platform
> + * and to the Fido/Lauterbach device.
> + */
> +static void pti_tty_driver_close(struct tty_struct *tty, struct file *filp)
> +{
> +	tty_port_close(&drv_data->port, tty, filp);
> +
> +	return;
> +}
> +
> +static int pti_tty_install(struct tty_driver *driver, struct tty_struct *tty)
> +{
> +	int idx = tty->index;
> +	struct pti_tty *pti_tty_data;
> +	struct pti_masterchannel *mc;
> +	int ret = tty_init_termios(tty);
> +
> +	if (ret == 0) {
> +		tty_driver_kref_get(driver);
> +		tty->count++;
> +		driver->ttys[idx] = tty;
> +
> +		pti_tty_data = kmalloc(sizeof(struct pti_tty), GFP_KERNEL);
> +		if (pti_tty_data == NULL)
> +			return -ENOMEM;
> +
> +		tty->driver_data = pti_tty_data;
> +
> +		if (idx == PTITTY_MINOR_START)
> +			mc = pti_request_masterchannel(0);
> +		else
> +			mc = pti_request_masterchannel(2);
> +
> +		if (mc == NULL)
> +			return -ENXIO;
> +
> +		pti_tty_data->mc = mc;
> +	}
> +
> +	return ret;
> +}
> +
> +static void pti_tty_cleanup(struct tty_struct *tty)
> +{
> +	struct pti_tty *pti_tty_data;
> +	struct pti_masterchannel *mc;
> +
> +	pti_tty_data = tty->driver_data;
> +
> +	if (pti_tty_data != NULL) {
> +		mc = pti_tty_data->mc;
> +		pti_release_masterchannel(mc);
> +		pti_tty_data->mc = NULL;
> +	}
> +
> +	if (pti_tty_data != NULL)
> +		kfree(pti_tty_data);
> +
> +	tty->driver_data = NULL;
> +}
> +
> +/**
> + * pti_tty_driver_write():  Write trace debugging data through the char

 * pti_tty_driver_write() - <text>

> + * interface to the PTI HW.  Part of the misc device implementation.
> + *
> + * @param filp: Contains private data which is used to obtain
> + *              master, channel write ID.
> + * @param data: trace data to be written.
> + * @param len:  # of byte to write.
> + * @return int : # of bytes written, or error.

Fix kernel-doc notation.  again.  :(

> + */
> +static int pti_tty_driver_write(struct tty_struct *tty,
> +	const unsigned char *buf, int len)
> +{
> +	struct pti_masterchannel *mc;
> +	struct pti_tty *pti_tty_data;
> +
> +	pti_tty_data = tty->driver_data;
> +	mc = pti_tty_data->mc;
> +	pti_write_to_aperture(mc, (u8 *)buf, len);
> +
> +	return len;
> +}
> +
> +static int pti_tty_write_room(struct tty_struct *tty)
> +{
> +	return 2048;
> +}
> +
> +/**
> + * pti_char_open()- Open an Application master, channel aperture
> + * ID to the PTI device. Part of the misc device implementation.
> + *
> + * @param inode: not used.
> + * @param filp: Output- will have a masterchannel struct set containing
> + * the allocated application PTI aperture write address.
> + *
> + * @return int : Success = 0, otherwise fail.  As of right now,
> + *         it is not sure what needs to really be initialized
> + *         for open(), so it always returns 0.

Fix kernel-doc notation.

> + */
> +static int pti_char_open(struct inode *inode, struct file *filp)
> +{
> +	struct pti_masterchannel *mc;
> +
> +	mc = pti_request_masterchannel(0);
> +	if (mc == NULL)
> +		return -ENOMEM;
> +	filp->private_data = mc;
> +	return 0;
> +}
> +
> +/**
> + * pti_char_release()-  Close a char channel to the PTI device. Part
> + * of the misc device implementation.
> + *
> + * @param inode: Not used in this implementaiton.
> + * @param filp: Contains private_data that contains the master, channel
> + * ID to be released by the PTI device.
> + *
> + * @return int : Success = 0

fix kernel-doc notation.

> + */
> +static int pti_char_release(struct inode *inode, struct file *filp)
> +{
> +	pti_release_masterchannel(filp->private_data);
> +	return 0;
> +}
> +
> +/**
> + * pti_char_write():  Write trace debugging data through the char

use '-' instead of ':'

> + * interface to the PTI HW.  Part of the misc device implementation.
> + *
> + * @param filp: Contains private data which is used to obtain
> + *              master, channel write ID.
> + * @param data: trace data to be written.
> + * @param len:  # of byte to write.
> + * @param ppose: Not used in this function implementation.
> + * @return int : # of bytes written, or error.

Fix kernel-doc notation.

> + *
> + * Notes: From side discussions with Alan Cox and experimenting
> + * with PTI debug HW like Nokia's Fido box and Lauterbach
> + * devices, 8192 byte write buffer used by USER_COPY_SIZE was
> + * deemed an appropriate size for this type of usage with
> + * debugging HW.
> + */
> +static ssize_t pti_char_write(struct file *filp, const char __user *data,
> +			      size_t len, loff_t *ppose)
> +{
> +	struct pti_masterchannel *mc;
> +	void *kbuf;
> +	const char __user *tmp;
> +	size_t size = USER_COPY_SIZE, n = 0;
> +
> +	tmp = data;
> +	mc = filp->private_data;
> +
> +	kbuf = kmalloc(size, GFP_KERNEL);
> +	if (kbuf == NULL)  {
> +		pr_err("%s(%d): buf allocation failed\n",
> +			__func__, __LINE__);
> +		return 0;
> +	}
> +
> +	do {
> +		if (len - n > USER_COPY_SIZE)
> +			size = USER_COPY_SIZE;
> +		else
> +			size = len - n;
> +
> +		if (copy_from_user(kbuf, tmp, size)) {
> +			kfree(kbuf);
> +			return n ? n : -EFAULT;
> +		}
> +
> +		pti_write_to_aperture(mc, kbuf, size);
> +		n  += size;
> +		tmp += size;
> +
> +	} while (len > n);
> +
> +	kfree(kbuf);
> +	kbuf = NULL;
> +
> +	return len;
> +}
> +
> +static const struct tty_operations pti_tty_driver_ops = {
> +	.open		= pti_tty_driver_open,
> +	.close		= pti_tty_driver_close,
> +	.write		= pti_tty_driver_write,
> +	.write_room	= pti_tty_write_room,
> +	.install	= pti_tty_install,
> +	.cleanup	= pti_tty_cleanup
> +};
> +
> +static const struct file_operations pti_char_driver_ops = {
> +	.owner		= THIS_MODULE,
> +	.write		= pti_char_write,
> +	.open		= pti_char_open,
> +	.release	= pti_char_release,
> +};
> +
> +static struct miscdevice pti_char_driver = {
> +	.minor		= MISC_DYNAMIC_MINOR,
> +	.name		= CHARNAME,
> +	.fops		= &pti_char_driver_ops
> +};
> +
> +static void pti_console_write(struct console *c, const char *buf, unsigned len)
> +{
> +	static struct pti_masterchannel mc = {.master  = CONSOLE_ID,
> +					      .channel = 0};
> +
> +	mc.channel = pti_console_channel;
> +	pti_console_channel = (pti_console_channel + 1) & 0x7f;
> +
> +	pti_write_full_frame_to_aperture(&mc, buf, len);
> +}
> +
> +static struct tty_driver *pti_console_device(struct console *c, int *index)
> +{
> +	*index = c->index;
> +	return pti_tty_driver;
> +}
> +
> +static int pti_console_setup(struct console *c, char *opts)
> +{
> +	pti_console_channel = 0;
> +	pti_control_channel = 0;
> +	return 0;
> +}
> +
> +/* pti_console struct, used to capture OS printk()'s and shift
> + * out to the PTI device for debugging.  This cannot be
> + * enabled upon boot because of the possibility of eating
> + * any serial console printk's (race condition discovered).
> + * The console should be enabled upon when the tty port is
> + * used for the first time.  Since the primary purpose for
> + * the tty port is to hook up syslog to it, the tty port
> + * will be open for a really long time.
> + */

fix long comment style.

> +static struct console pti_console = {
> +	.name		= TTYNAME,
> +	.write		= pti_console_write,
> +	.device		= pti_console_device,
> +	.setup		= pti_console_setup,
> +	.flags		= CON_PRINTBUFFER,
> +	.index		= 0,
> +};
> +
> +/**
> + * pti_port_activate(): Used to start/initialize any items upon

use '-' instead of ':'

> + * first opening of tty_port().
> + *
> + * @param port- The tty port number of the PTI device.
> + * @param tty-  The tty struct associated with this device.
> + *
> + * @return int - Always returns 0.

fix kernel-doc notation.

> + *
> + * Notes: The primary purpose of the PTI tty port 0 is to hook
> + * the syslog daemon to it; thus this port will be open for a
> + * very long time.
> + */
> +static int pti_port_activate(struct tty_port *port, struct tty_struct *tty)
> +{
> +	if (port->tty->index == PTITTY_MINOR_START)
> +		console_start(&pti_console);
> +	return 0;
> +}
> +
> +/**
> + * pti_port_shutdown(): Used to stop/shutdown any items upon the

use - instead of :

> + * last tty port close.
> + *
> + * @param port- The tty port number of the PTI device.

fix kernel-doc notation.

> + *
> + * Notes: The primary purpose of the PTI tty port 0 is to hook
> + * the syslog daemon to it; thus this port will be open for a
> + * very long time.
> + */
> +static void pti_port_shutdown(struct tty_port *port)
> +{
> +	if (port->tty->index == PTITTY_MINOR_START)
> +		console_stop(&pti_console);
> +}
> +
> +static const struct tty_port_operations tty_port_ops = {
> +	.activate = pti_port_activate,
> +	.shutdown = pti_port_shutdown,
> +};
> +
> +/*
> +   Note the _probe() call sets everything up and ties the char and tty
> +   to successfully detecting the PTI device on the pci bus.
> +*/

fix long comment style.

> +
> +static int __devinit pti_pci_probe(struct pci_dev *pdev,
> +		const struct pci_device_id *ent)
> +{
> +	int retval = -EINVAL;
> +	int pci_bar = 1;
> +
> +	dev_dbg(&pdev->dev, "%s %s(%d): PTI PCI ID %04x:%04x\n", __FILE__,
> +			__func__, __LINE__, pdev->vendor, pdev->device);
> +
> +	retval = misc_register(&pti_char_driver);
> +	if (retval) {
> +		pr_err("%s(%d): CHAR registration failed of pti driver\n",
> +			__func__, __LINE__);
> +		pr_err("%s(%d): Error value returned: %d\n",
> +			__func__, __LINE__, retval);
> +		return retval;
> +	}
> +
> +	retval = pci_enable_device(pdev);
> +	if (retval != 0) {
> +		dev_err(&pdev->dev,
> +			"%s: pci_enable_device() returned error %d\n",
> +			__func__, retval);
> +		return retval;
> +	}
> +
> +	drv_data = kzalloc(sizeof(*drv_data), GFP_KERNEL);
> +
> +	if (drv_data == NULL) {
> +		retval = -ENOMEM;
> +		dev_err(&pdev->dev,
> +			"%s(%d): kmalloc() returned NULL memory.\n",
> +			__func__, __LINE__);
> +		return retval;
> +	}
> +	drv_data->pti_addr = pci_resource_start(pdev, pci_bar);
> +
> +	retval = pci_request_region(pdev, pci_bar, dev_name(&pdev->dev));
> +	if (retval != 0) {
> +		dev_err(&pdev->dev,
> +			"%s(%d): pci_request_region() returned error %d\n",
> +			__func__, __LINE__, retval);
> +		kfree(drv_data);
> +		return retval;
> +	}
> +	drv_data->aperture_base = drv_data->pti_addr+APERTURE_14;
> +	drv_data->pti_ioaddr =
> +		ioremap_nocache((u32)drv_data->aperture_base,
> +		APERTURE_LEN);
> +	if (!drv_data->pti_ioaddr) {
> +		pci_release_region(pdev, pci_bar);
> +		retval = -ENOMEM;
> +		kfree(drv_data);
> +		return retval;
> +	}
> +
> +	pci_set_drvdata(pdev, drv_data);
> +
> +	tty_port_init(&drv_data->port);
> +	drv_data->port.ops = &tty_port_ops;
> +
> +	tty_register_device(pti_tty_driver, 0, &pdev->dev);
> +	tty_register_device(pti_tty_driver, 1, &pdev->dev);
> +
> +	register_console(&pti_console);
> +
> +	return retval;
> +}
> +
> +static struct pci_driver pti_pci_driver = {
> +	.name		= PCINAME,
> +	.id_table	= pci_ids,
> +	.probe		= pti_pci_probe,
> +	.remove		= pti_pci_remove,
> +};
> +
> +/**
> + *
> + * pti_init():

Needs short function summary on line above.

> + *
> + * @return int __init: 0 for success, any other value error.

fix kernel-doc notation.

> + *
> + */
> +static int __init pti_init(void)
> +{
> +	int retval = -EINVAL;
> +
> +	/* First register module as tty device */
> +
> +	pti_tty_driver = alloc_tty_driver(1);
> +	if (pti_tty_driver == NULL) {
> +		pr_err("%s(%d): Memory allocation failed for ptiTTY driver\n",
> +			__func__, __LINE__);
> +		return -ENOMEM;
> +	}
> +
> +	pti_tty_driver->owner			= THIS_MODULE;
> +	pti_tty_driver->magic			= TTY_DRIVER_MAGIC;
> +	pti_tty_driver->driver_name		= DRIVERNAME;
> +	pti_tty_driver->name			= TTYNAME;
> +	pti_tty_driver->major			= 0;
> +	pti_tty_driver->minor_start		= PTITTY_MINOR_START;
> +	pti_tty_driver->minor_num		= PTITTY_MINOR_NUM;
> +	pti_tty_driver->num			= PTITTY_MINOR_NUM;
> +	pti_tty_driver->type			= TTY_DRIVER_TYPE_SYSTEM;
> +	pti_tty_driver->subtype			= SYSTEM_TYPE_SYSCONS;
> +	pti_tty_driver->flags			= TTY_DRIVER_REAL_RAW |
> +						  TTY_DRIVER_DYNAMIC_DEV;
> +	pti_tty_driver->init_termios		= tty_std_termios;
> +
> +	tty_set_operations(pti_tty_driver, &pti_tty_driver_ops);
> +
> +	retval = tty_register_driver(pti_tty_driver);
> +	if (retval) {
> +		pr_err("%s(%d): TTY registration failed of pti driver\n",
> +			__func__, __LINE__);
> +		pr_err("%s(%d): Error value returned: %d\n",
> +			__func__, __LINE__, retval);
> +
> +		pti_tty_driver = NULL;
> +		return retval;
> +	}
> +
> +	retval = pci_register_driver(&pti_pci_driver);
> +
> +	if (retval) {
> +		pr_err("%s(%d): PCI registration failed of pti driver\n",
> +			__func__, __LINE__);
> +		pr_err("%s(%d): Error value returned: %d\n",
> +			__func__, __LINE__, retval);
> +
> +		tty_unregister_driver(pti_tty_driver);
> +		pr_err("%s(%d): Unregistering TTY part of pti driver\n",
> +			__func__, __LINE__);
> +		pti_tty_driver = NULL;
> +		return retval;
> +	}
> +
> +	return retval;
> +}
> +
> +/**
> + * pti_exit(): Unregisters this module as a tty and pci driver.

use - instead of :

> + */
> +static void __exit pti_exit(void)
> +{
> +	int retval;
> +
> +	tty_unregister_device(pti_tty_driver, 0);
> +	tty_unregister_device(pti_tty_driver, 1);
> +
> +	retval = tty_unregister_driver(pti_tty_driver);
> +	if (retval) {
> +		pr_err("%s(%d): TTY unregistration failed of pti driver\n",
> +			__func__, __LINE__);
> +		pr_err("%s(%d): Error value returned: %d\n",
> +			__func__, __LINE__, retval);
> +	}
> +
> +	pci_unregister_driver(&pti_pci_driver);
> +
> +	retval = misc_deregister(&pti_char_driver);
> +	if (retval) {
> +		pr_err("%s(%d): CHAR unregistration failed of pti driver\n",
> +			__func__, __LINE__);
> +		pr_err("%s(%d): Error value returned: %d\n",
> +			__func__, __LINE__, retval);
> +	}
> +
> +	unregister_console(&pti_console);
> +	return;
> +}
> +
> +module_init(pti_init);
> +module_exit(pti_exit);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Ken Mills, Jay Freyensee");
> +MODULE_DESCRIPTION("PTI Driver");


---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
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