linux-hardened/drivers/usb/class/usbtmc.c

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// SPDX-License-Identifier: GPL-2.0+
/**
* drivers/usb/class/usbtmc.c - USB Test & Measurement class driver
*
* Copyright (C) 2007 Stefan Kopp, Gechingen, Germany
* Copyright (C) 2008 Novell, Inc.
* Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de>
* Copyright (C) 2018 IVI Foundation, Inc.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/kref.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 09:04:11 +01:00
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/mutex.h>
#include <linux/usb.h>
#include <linux/compat.h>
#include <linux/usb/tmc.h>
#define USBTMC_HEADER_SIZE 12
#define USBTMC_MINOR_BASE 176
/*
* Size of driver internal IO buffer. Must be multiple of 4 and at least as
* large as wMaxPacketSize (which is usually 512 bytes).
*/
#define USBTMC_SIZE_IOBUFFER 2048
/* Minimum USB timeout (in milliseconds) */
#define USBTMC_MIN_TIMEOUT 100
/* Default USB timeout (in milliseconds) */
#define USBTMC_TIMEOUT 5000
/* I/O buffer size used in generic read/write functions */
#define USBTMC_BUFSIZE (4096)
/*
* Maximum number of read cycles to empty bulk in endpoint during CLEAR and
* ABORT_BULK_IN requests. Ends the loop if (for whatever reason) a short
* packet is never read.
*/
#define USBTMC_MAX_READS_TO_CLEAR_BULK_IN 100
static const struct usb_device_id usbtmc_devices[] = {
{ USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 0), },
{ USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, 3, 1), },
{ 0, } /* terminating entry */
};
MODULE_DEVICE_TABLE(usb, usbtmc_devices);
/*
* This structure is the capabilities for the device
* See section 4.2.1.8 of the USBTMC specification,
* and section 4.2.2 of the USBTMC usb488 subclass
* specification for details.
*/
struct usbtmc_dev_capabilities {
__u8 interface_capabilities;
__u8 device_capabilities;
__u8 usb488_interface_capabilities;
__u8 usb488_device_capabilities;
};
/* This structure holds private data for each USBTMC device. One copy is
* allocated for each USBTMC device in the driver's probe function.
*/
struct usbtmc_device_data {
const struct usb_device_id *id;
struct usb_device *usb_dev;
struct usb_interface *intf;
struct list_head file_list;
unsigned int bulk_in;
unsigned int bulk_out;
u8 bTag;
u8 bTag_last_write; /* needed for abort */
u8 bTag_last_read; /* needed for abort */
/* data for interrupt in endpoint handling */
u8 bNotify1;
u8 bNotify2;
u16 ifnum;
u8 iin_bTag;
u8 *iin_buffer;
atomic_t iin_data_valid;
unsigned int iin_ep;
int iin_ep_present;
int iin_interval;
struct urb *iin_urb;
u16 iin_wMaxPacketSize;
/* coalesced usb488_caps from usbtmc_dev_capabilities */
__u8 usb488_caps;
/* attributes from the USB TMC spec for this device */
u8 TermChar;
bool TermCharEnabled;
bool auto_abort;
bool zombie; /* fd of disconnected device */
struct usbtmc_dev_capabilities capabilities;
struct kref kref;
struct mutex io_mutex; /* only one i/o function running at a time */
wait_queue_head_t waitq;
struct fasync_struct *fasync;
spinlock_t dev_lock; /* lock for file_list */
};
#define to_usbtmc_data(d) container_of(d, struct usbtmc_device_data, kref)
/*
* This structure holds private data for each USBTMC file handle.
*/
struct usbtmc_file_data {
struct usbtmc_device_data *data;
struct list_head file_elem;
u32 timeout;
u8 srq_byte;
atomic_t srq_asserted;
u8 eom_val;
u8 term_char;
bool term_char_enabled;
};
/* Forward declarations */
static struct usb_driver usbtmc_driver;
static void usbtmc_delete(struct kref *kref)
{
struct usbtmc_device_data *data = to_usbtmc_data(kref);
usb_put_dev(data->usb_dev);
kfree(data);
}
static int usbtmc_open(struct inode *inode, struct file *filp)
{
struct usb_interface *intf;
struct usbtmc_device_data *data;
struct usbtmc_file_data *file_data;
intf = usb_find_interface(&usbtmc_driver, iminor(inode));
if (!intf) {
pr_err("can not find device for minor %d", iminor(inode));
return -ENODEV;
}
file_data = kzalloc(sizeof(*file_data), GFP_KERNEL);
if (!file_data)
return -ENOMEM;
data = usb_get_intfdata(intf);
/* Protect reference to data from file structure until release */
kref_get(&data->kref);
mutex_lock(&data->io_mutex);
file_data->data = data;
/* copy default values from device settings */
file_data->timeout = USBTMC_TIMEOUT;
file_data->term_char = data->TermChar;
file_data->term_char_enabled = data->TermCharEnabled;
file_data->eom_val = 1;
INIT_LIST_HEAD(&file_data->file_elem);
spin_lock_irq(&data->dev_lock);
list_add_tail(&file_data->file_elem, &data->file_list);
spin_unlock_irq(&data->dev_lock);
mutex_unlock(&data->io_mutex);
/* Store pointer in file structure's private data field */
filp->private_data = file_data;
return 0;
}
static int usbtmc_release(struct inode *inode, struct file *file)
{
struct usbtmc_file_data *file_data = file->private_data;
/* prevent IO _AND_ usbtmc_interrupt */
mutex_lock(&file_data->data->io_mutex);
spin_lock_irq(&file_data->data->dev_lock);
list_del(&file_data->file_elem);
spin_unlock_irq(&file_data->data->dev_lock);
mutex_unlock(&file_data->data->io_mutex);
kref_put(&file_data->data->kref, usbtmc_delete);
file_data->data = NULL;
kfree(file_data);
return 0;
}
static int usbtmc_ioctl_abort_bulk_in(struct usbtmc_device_data *data)
{
u8 *buffer;
struct device *dev;
int rv;
int n;
int actual;
struct usb_host_interface *current_setting;
int max_size;
dev = &data->intf->dev;
buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
rv = usb_control_msg(data->usb_dev,
usb_rcvctrlpipe(data->usb_dev, 0),
USBTMC_REQUEST_INITIATE_ABORT_BULK_IN,
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
data->bTag_last_read, data->bulk_in,
buffer, 2, USBTMC_TIMEOUT);
if (rv < 0) {
dev_err(dev, "usb_control_msg returned %d\n", rv);
goto exit;
}
dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
if (buffer[0] == USBTMC_STATUS_FAILED) {
rv = 0;
goto exit;
}
if (buffer[0] != USBTMC_STATUS_SUCCESS) {
dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n",
buffer[0]);
rv = -EPERM;
goto exit;
}
max_size = 0;
current_setting = data->intf->cur_altsetting;
for (n = 0; n < current_setting->desc.bNumEndpoints; n++)
if (current_setting->endpoint[n].desc.bEndpointAddress ==
data->bulk_in)
USB: use usb_endpoint_maxp() instead of le16_to_cpu() Now ${LINUX}/drivers/usb/* can use usb_endpoint_maxp(desc) to get maximum packet size instead of le16_to_cpu(desc->wMaxPacketSize). This patch fix it up Cc: Armin Fuerst <fuerst@in.tum.de> Cc: Pavel Machek <pavel@ucw.cz> Cc: Johannes Erdfelt <johannes@erdfelt.com> Cc: Vojtech Pavlik <vojtech@suse.cz> Cc: Oliver Neukum <oliver@neukum.name> Cc: David Kubicek <dave@awk.cz> Cc: Johan Hovold <jhovold@gmail.com> Cc: Brad Hards <bhards@bigpond.net.au> Acked-by: Felipe Balbi <balbi@ti.com> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Thomas Dahlmann <dahlmann.thomas@arcor.de> Cc: David Brownell <david-b@pacbell.net> Cc: David Lopo <dlopo@chipidea.mips.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Michal Nazarewicz <m.nazarewicz@samsung.com> Cc: Xie Xiaobo <X.Xie@freescale.com> Cc: Li Yang <leoli@freescale.com> Cc: Jiang Bo <tanya.jiang@freescale.com> Cc: Yuan-hsin Chen <yhchen@faraday-tech.com> Cc: Darius Augulis <augulis.darius@gmail.com> Cc: Xiaochen Shen <xiaochen.shen@intel.com> Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Cc: OKI SEMICONDUCTOR, <toshiharu-linux@dsn.okisemi.com> Cc: Robert Jarzmik <robert.jarzmik@free.fr> Cc: Ben Dooks <ben@simtec.co.uk> Cc: Thomas Abraham <thomas.ab@samsung.com> Cc: Herbert Pötzl <herbert@13thfloor.at> Cc: Arnaud Patard <arnaud.patard@rtp-net.org> Cc: Roman Weissgaerber <weissg@vienna.at> Acked-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Cc: Tony Olech <tony.olech@elandigitalsystems.com> Cc: Florian Floe Echtler <echtler@fs.tum.de> Cc: Christian Lucht <lucht@codemercs.com> Cc: Juergen Stuber <starblue@sourceforge.net> Cc: Georges Toth <g.toth@e-biz.lu> Cc: Bill Ryder <bryder@sgi.com> Cc: Kuba Ober <kuba@mareimbrium.org> Cc: Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-08-23 12:12:03 +02:00
max_size = usb_endpoint_maxp(&current_setting->endpoint[n].desc);
if (max_size == 0) {
dev_err(dev, "Couldn't get wMaxPacketSize\n");
rv = -EPERM;
goto exit;
}
dev_dbg(&data->intf->dev, "wMaxPacketSize is %d\n", max_size);
n = 0;
do {
dev_dbg(dev, "Reading from bulk in EP\n");
rv = usb_bulk_msg(data->usb_dev,
usb_rcvbulkpipe(data->usb_dev,
data->bulk_in),
buffer, USBTMC_SIZE_IOBUFFER,
&actual, USBTMC_TIMEOUT);
n++;
if (rv < 0) {
dev_err(dev, "usb_bulk_msg returned %d\n", rv);
goto exit;
}
} while ((actual == max_size) &&
(n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
if (actual == max_size) {
dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
rv = -EPERM;
goto exit;
}
n = 0;
usbtmc_abort_bulk_in_status:
rv = usb_control_msg(data->usb_dev,
usb_rcvctrlpipe(data->usb_dev, 0),
USBTMC_REQUEST_CHECK_ABORT_BULK_IN_STATUS,
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
0, data->bulk_in, buffer, 0x08,
USBTMC_TIMEOUT);
if (rv < 0) {
dev_err(dev, "usb_control_msg returned %d\n", rv);
goto exit;
}
dev_dbg(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
if (buffer[0] == USBTMC_STATUS_SUCCESS) {
rv = 0;
goto exit;
}
if (buffer[0] != USBTMC_STATUS_PENDING) {
dev_err(dev, "INITIATE_ABORT_BULK_IN returned %x\n", buffer[0]);
rv = -EPERM;
goto exit;
}
if (buffer[1] == 1)
do {
dev_dbg(dev, "Reading from bulk in EP\n");
rv = usb_bulk_msg(data->usb_dev,
usb_rcvbulkpipe(data->usb_dev,
data->bulk_in),
buffer, USBTMC_SIZE_IOBUFFER,
&actual, USBTMC_TIMEOUT);
n++;
if (rv < 0) {
dev_err(dev, "usb_bulk_msg returned %d\n", rv);
goto exit;
}
} while ((actual == max_size) &&
(n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
if (actual == max_size) {
dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
rv = -EPERM;
goto exit;
}
goto usbtmc_abort_bulk_in_status;
exit:
kfree(buffer);
return rv;
}
static int usbtmc_ioctl_abort_bulk_out(struct usbtmc_device_data *data)
{
struct device *dev;
u8 *buffer;
int rv;
int n;
dev = &data->intf->dev;
buffer = kmalloc(8, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
rv = usb_control_msg(data->usb_dev,
usb_rcvctrlpipe(data->usb_dev, 0),
USBTMC_REQUEST_INITIATE_ABORT_BULK_OUT,
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
data->bTag_last_write, data->bulk_out,
buffer, 2, USBTMC_TIMEOUT);
if (rv < 0) {
dev_err(dev, "usb_control_msg returned %d\n", rv);
goto exit;
}
dev_dbg(dev, "INITIATE_ABORT_BULK_OUT returned %x\n", buffer[0]);
if (buffer[0] != USBTMC_STATUS_SUCCESS) {
dev_err(dev, "INITIATE_ABORT_BULK_OUT returned %x\n",
buffer[0]);
rv = -EPERM;
goto exit;
}
n = 0;
usbtmc_abort_bulk_out_check_status:
rv = usb_control_msg(data->usb_dev,
usb_rcvctrlpipe(data->usb_dev, 0),
USBTMC_REQUEST_CHECK_ABORT_BULK_OUT_STATUS,
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
0, data->bulk_out, buffer, 0x08,
USBTMC_TIMEOUT);
n++;
if (rv < 0) {
dev_err(dev, "usb_control_msg returned %d\n", rv);
goto exit;
}
dev_dbg(dev, "CHECK_ABORT_BULK_OUT returned %x\n", buffer[0]);
if (buffer[0] == USBTMC_STATUS_SUCCESS)
goto usbtmc_abort_bulk_out_clear_halt;
if ((buffer[0] == USBTMC_STATUS_PENDING) &&
(n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN))
goto usbtmc_abort_bulk_out_check_status;
rv = -EPERM;
goto exit;
usbtmc_abort_bulk_out_clear_halt:
rv = usb_clear_halt(data->usb_dev,
usb_sndbulkpipe(data->usb_dev, data->bulk_out));
if (rv < 0) {
dev_err(dev, "usb_control_msg returned %d\n", rv);
goto exit;
}
rv = 0;
exit:
kfree(buffer);
return rv;
}
static int usbtmc488_ioctl_read_stb(struct usbtmc_file_data *file_data,
void __user *arg)
{
struct usbtmc_device_data *data = file_data->data;
struct device *dev = &data->intf->dev;
int srq_asserted = 0;
u8 *buffer;
u8 tag;
__u8 stb;
int rv;
dev_dbg(dev, "Enter ioctl_read_stb iin_ep_present: %d\n",
data->iin_ep_present);
spin_lock_irq(&data->dev_lock);
srq_asserted = atomic_xchg(&file_data->srq_asserted, srq_asserted);
if (srq_asserted) {
/* a STB with SRQ is already received */
stb = file_data->srq_byte;
spin_unlock_irq(&data->dev_lock);
rv = put_user(stb, (__u8 __user *)arg);
dev_dbg(dev, "stb:0x%02x with srq received %d\n",
(unsigned int)stb, rv);
return rv;
}
spin_unlock_irq(&data->dev_lock);
buffer = kmalloc(8, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
atomic_set(&data->iin_data_valid, 0);
rv = usb_control_msg(data->usb_dev,
usb_rcvctrlpipe(data->usb_dev, 0),
USBTMC488_REQUEST_READ_STATUS_BYTE,
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
data->iin_bTag,
data->ifnum,
buffer, 0x03, USBTMC_TIMEOUT);
if (rv < 0) {
dev_err(dev, "stb usb_control_msg returned %d\n", rv);
goto exit;
}
if (buffer[0] != USBTMC_STATUS_SUCCESS) {
dev_err(dev, "control status returned %x\n", buffer[0]);
rv = -EIO;
goto exit;
}
if (data->iin_ep_present) {
rv = wait_event_interruptible_timeout(
data->waitq,
atomic_read(&data->iin_data_valid) != 0,
file_data->timeout);
if (rv < 0) {
dev_dbg(dev, "wait interrupted %d\n", rv);
goto exit;
}
if (rv == 0) {
dev_dbg(dev, "wait timed out\n");
rv = -ETIMEDOUT;
goto exit;
}
tag = data->bNotify1 & 0x7f;
if (tag != data->iin_bTag) {
dev_err(dev, "expected bTag %x got %x\n",
data->iin_bTag, tag);
}
stb = data->bNotify2;
} else {
stb = buffer[2];
}
rv = put_user(stb, (__u8 __user *)arg);
dev_dbg(dev, "stb:0x%02x received %d\n", (unsigned int)stb, rv);
exit:
/* bump interrupt bTag */
data->iin_bTag += 1;
if (data->iin_bTag > 127)
/* 1 is for SRQ see USBTMC-USB488 subclass spec section 4.3.1 */
data->iin_bTag = 2;
kfree(buffer);
return rv;
}
static int usbtmc488_ioctl_simple(struct usbtmc_device_data *data,
void __user *arg, unsigned int cmd)
{
struct device *dev = &data->intf->dev;
__u8 val;
u8 *buffer;
u16 wValue;
int rv;
if (!(data->usb488_caps & USBTMC488_CAPABILITY_SIMPLE))
return -EINVAL;
buffer = kmalloc(8, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
if (cmd == USBTMC488_REQUEST_REN_CONTROL) {
rv = copy_from_user(&val, arg, sizeof(val));
if (rv) {
rv = -EFAULT;
goto exit;
}
wValue = val ? 1 : 0;
} else {
wValue = 0;
}
rv = usb_control_msg(data->usb_dev,
usb_rcvctrlpipe(data->usb_dev, 0),
cmd,
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
wValue,
data->ifnum,
buffer, 0x01, USBTMC_TIMEOUT);
if (rv < 0) {
dev_err(dev, "simple usb_control_msg failed %d\n", rv);
goto exit;
} else if (rv != 1) {
dev_warn(dev, "simple usb_control_msg returned %d\n", rv);
rv = -EIO;
goto exit;
}
if (buffer[0] != USBTMC_STATUS_SUCCESS) {
dev_err(dev, "simple control status returned %x\n", buffer[0]);
rv = -EIO;
goto exit;
}
rv = 0;
exit:
kfree(buffer);
return rv;
}
/*
* Sends a TRIGGER Bulk-OUT command message
* See the USBTMC-USB488 specification, Table 2.
*
* Also updates bTag_last_write.
*/
static int usbtmc488_ioctl_trigger(struct usbtmc_file_data *file_data)
{
struct usbtmc_device_data *data = file_data->data;
int retval;
u8 *buffer;
int actual;
buffer = kzalloc(USBTMC_HEADER_SIZE, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
buffer[0] = 128;
buffer[1] = data->bTag;
buffer[2] = ~data->bTag;
retval = usb_bulk_msg(data->usb_dev,
usb_sndbulkpipe(data->usb_dev,
data->bulk_out),
buffer, USBTMC_HEADER_SIZE,
&actual, file_data->timeout);
/* Store bTag (in case we need to abort) */
data->bTag_last_write = data->bTag;
/* Increment bTag -- and increment again if zero */
data->bTag++;
if (!data->bTag)
data->bTag++;
kfree(buffer);
if (retval < 0) {
dev_err(&data->intf->dev, "%s returned %d\n",
__func__, retval);
return retval;
}
return 0;
}
/*
* Sends a REQUEST_DEV_DEP_MSG_IN message on the Bulk-OUT endpoint.
* @transfer_size: number of bytes to request from the device.
*
* See the USBTMC specification, Table 4.
*
* Also updates bTag_last_write.
*/
static int send_request_dev_dep_msg_in(struct usbtmc_file_data *file_data,
size_t transfer_size)
{
struct usbtmc_device_data *data = file_data->data;
int retval;
u8 *buffer;
int actual;
buffer = kmalloc(USBTMC_HEADER_SIZE, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
/* Setup IO buffer for REQUEST_DEV_DEP_MSG_IN message
* Refer to class specs for details
*/
buffer[0] = 2;
buffer[1] = data->bTag;
buffer[2] = ~data->bTag;
buffer[3] = 0; /* Reserved */
buffer[4] = transfer_size >> 0;
buffer[5] = transfer_size >> 8;
buffer[6] = transfer_size >> 16;
buffer[7] = transfer_size >> 24;
buffer[8] = file_data->term_char_enabled * 2;
/* Use term character? */
buffer[9] = file_data->term_char;
buffer[10] = 0; /* Reserved */
buffer[11] = 0; /* Reserved */
/* Send bulk URB */
retval = usb_bulk_msg(data->usb_dev,
usb_sndbulkpipe(data->usb_dev,
data->bulk_out),
buffer, USBTMC_HEADER_SIZE,
&actual, file_data->timeout);
/* Store bTag (in case we need to abort) */
data->bTag_last_write = data->bTag;
/* Increment bTag -- and increment again if zero */
data->bTag++;
if (!data->bTag)
data->bTag++;
kfree(buffer);
if (retval < 0) {
dev_err(&data->intf->dev, "usb_bulk_msg in send_request_dev_dep_msg_in() returned %d\n", retval);
return retval;
}
return 0;
}
static ssize_t usbtmc_read(struct file *filp, char __user *buf,
size_t count, loff_t *f_pos)
{
struct usbtmc_file_data *file_data;
struct usbtmc_device_data *data;
struct device *dev;
u32 n_characters;
u8 *buffer;
int actual;
size_t done;
size_t remaining;
int retval;
size_t this_part;
/* Get pointer to private data structure */
file_data = filp->private_data;
data = file_data->data;
dev = &data->intf->dev;
buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
mutex_lock(&data->io_mutex);
if (data->zombie) {
retval = -ENODEV;
goto exit;
}
dev_dbg(dev, "usb_bulk_msg_in: count(%zu)\n", count);
retval = send_request_dev_dep_msg_in(file_data, count);
if (retval < 0) {
if (data->auto_abort)
usbtmc_ioctl_abort_bulk_out(data);
goto exit;
}
/* Loop until we have fetched everything we requested */
remaining = count;
this_part = remaining;
done = 0;
while (remaining > 0) {
/* Send bulk URB */
retval = usb_bulk_msg(data->usb_dev,
usb_rcvbulkpipe(data->usb_dev,
data->bulk_in),
buffer, USBTMC_SIZE_IOBUFFER, &actual,
file_data->timeout);
dev_dbg(dev, "usb_bulk_msg: retval(%u), done(%zu), remaining(%zu), actual(%d)\n", retval, done, remaining, actual);
/* Store bTag (in case we need to abort) */
data->bTag_last_read = data->bTag;
if (retval < 0) {
dev_dbg(dev, "Unable to read data, error %d\n", retval);
if (data->auto_abort)
usbtmc_ioctl_abort_bulk_in(data);
goto exit;
}
/* Parse header in first packet */
if (done == 0) {
/* Sanity checks for the header */
if (actual < USBTMC_HEADER_SIZE) {
dev_err(dev, "Device sent too small first packet: %u < %u\n", actual, USBTMC_HEADER_SIZE);
if (data->auto_abort)
usbtmc_ioctl_abort_bulk_in(data);
goto exit;
}
if (buffer[0] != 2) {
dev_err(dev, "Device sent reply with wrong MsgID: %u != 2\n", buffer[0]);
if (data->auto_abort)
usbtmc_ioctl_abort_bulk_in(data);
goto exit;
}
if (buffer[1] != data->bTag_last_write) {
dev_err(dev, "Device sent reply with wrong bTag: %u != %u\n", buffer[1], data->bTag_last_write);
if (data->auto_abort)
usbtmc_ioctl_abort_bulk_in(data);
goto exit;
}
/* How many characters did the instrument send? */
n_characters = buffer[4] +
(buffer[5] << 8) +
(buffer[6] << 16) +
(buffer[7] << 24);
if (n_characters > this_part) {
dev_err(dev, "Device wants to return more data than requested: %u > %zu\n", n_characters, count);
if (data->auto_abort)
usbtmc_ioctl_abort_bulk_in(data);
goto exit;
}
/* Remove the USBTMC header */
actual -= USBTMC_HEADER_SIZE;
/* Check if the message is smaller than requested */
if (remaining > n_characters)
remaining = n_characters;
/* Remove padding if it exists */
if (actual > remaining)
actual = remaining;
dev_dbg(dev, "Bulk-IN header: N_characters(%u), bTransAttr(%u)\n", n_characters, buffer[8]);
remaining -= actual;
/* Terminate if end-of-message bit received from device */
if ((buffer[8] & 0x01) && (actual >= n_characters))
remaining = 0;
dev_dbg(dev, "Bulk-IN header: remaining(%zu), buf(%p), buffer(%p) done(%zu)\n", remaining,buf,buffer,done);
/* Copy buffer to user space */
if (copy_to_user(buf + done, &buffer[USBTMC_HEADER_SIZE], actual)) {
/* There must have been an addressing problem */
retval = -EFAULT;
goto exit;
}
done += actual;
}
else {
if (actual > remaining)
actual = remaining;
remaining -= actual;
dev_dbg(dev, "Bulk-IN header cont: actual(%u), done(%zu), remaining(%zu), buf(%p), buffer(%p)\n", actual, done, remaining,buf,buffer);
/* Copy buffer to user space */
if (copy_to_user(buf + done, buffer, actual)) {
/* There must have been an addressing problem */
retval = -EFAULT;
goto exit;
}
done += actual;
}
}
/* Update file position value */
*f_pos = *f_pos + done;
retval = done;
exit:
mutex_unlock(&data->io_mutex);
kfree(buffer);
return retval;
}
static ssize_t usbtmc_write(struct file *filp, const char __user *buf,
size_t count, loff_t *f_pos)
{
struct usbtmc_file_data *file_data;
struct usbtmc_device_data *data;
u8 *buffer;
int retval;
int actual;
unsigned long int n_bytes;
int remaining;
int done;
int this_part;
file_data = filp->private_data;
data = file_data->data;
buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
mutex_lock(&data->io_mutex);
if (data->zombie) {
retval = -ENODEV;
goto exit;
}
remaining = count;
done = 0;
while (remaining > 0) {
if (remaining > USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE) {
this_part = USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE;
buffer[8] = 0;
} else {
this_part = remaining;
buffer[8] = file_data->eom_val;
}
/* Setup IO buffer for DEV_DEP_MSG_OUT message */
buffer[0] = 1;
buffer[1] = data->bTag;
buffer[2] = ~data->bTag;
buffer[3] = 0; /* Reserved */
buffer[4] = this_part >> 0;
buffer[5] = this_part >> 8;
buffer[6] = this_part >> 16;
buffer[7] = this_part >> 24;
/* buffer[8] is set above... */
buffer[9] = 0; /* Reserved */
buffer[10] = 0; /* Reserved */
buffer[11] = 0; /* Reserved */
if (copy_from_user(&buffer[USBTMC_HEADER_SIZE], buf + done, this_part)) {
retval = -EFAULT;
goto exit;
}
n_bytes = roundup(USBTMC_HEADER_SIZE + this_part, 4);
memset(buffer + USBTMC_HEADER_SIZE + this_part, 0, n_bytes - (USBTMC_HEADER_SIZE + this_part));
do {
retval = usb_bulk_msg(data->usb_dev,
usb_sndbulkpipe(data->usb_dev,
data->bulk_out),
buffer, n_bytes,
&actual, file_data->timeout);
if (retval != 0)
break;
n_bytes -= actual;
} while (n_bytes);
data->bTag_last_write = data->bTag;
data->bTag++;
if (!data->bTag)
data->bTag++;
if (retval < 0) {
dev_err(&data->intf->dev,
"Unable to send data, error %d\n", retval);
if (data->auto_abort)
usbtmc_ioctl_abort_bulk_out(data);
goto exit;
}
remaining -= this_part;
done += this_part;
}
retval = count;
exit:
mutex_unlock(&data->io_mutex);
kfree(buffer);
return retval;
}
static int usbtmc_ioctl_clear(struct usbtmc_device_data *data)
{
struct usb_host_interface *current_setting;
struct usb_endpoint_descriptor *desc;
struct device *dev;
u8 *buffer;
int rv;
int n;
int actual = 0;
int max_size;
dev = &data->intf->dev;
dev_dbg(dev, "Sending INITIATE_CLEAR request\n");
buffer = kmalloc(USBTMC_SIZE_IOBUFFER, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
rv = usb_control_msg(data->usb_dev,
usb_rcvctrlpipe(data->usb_dev, 0),
USBTMC_REQUEST_INITIATE_CLEAR,
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
0, 0, buffer, 1, USBTMC_TIMEOUT);
if (rv < 0) {
dev_err(dev, "usb_control_msg returned %d\n", rv);
goto exit;
}
dev_dbg(dev, "INITIATE_CLEAR returned %x\n", buffer[0]);
if (buffer[0] != USBTMC_STATUS_SUCCESS) {
dev_err(dev, "INITIATE_CLEAR returned %x\n", buffer[0]);
rv = -EPERM;
goto exit;
}
max_size = 0;
current_setting = data->intf->cur_altsetting;
for (n = 0; n < current_setting->desc.bNumEndpoints; n++) {
desc = &current_setting->endpoint[n].desc;
if (desc->bEndpointAddress == data->bulk_in)
USB: use usb_endpoint_maxp() instead of le16_to_cpu() Now ${LINUX}/drivers/usb/* can use usb_endpoint_maxp(desc) to get maximum packet size instead of le16_to_cpu(desc->wMaxPacketSize). This patch fix it up Cc: Armin Fuerst <fuerst@in.tum.de> Cc: Pavel Machek <pavel@ucw.cz> Cc: Johannes Erdfelt <johannes@erdfelt.com> Cc: Vojtech Pavlik <vojtech@suse.cz> Cc: Oliver Neukum <oliver@neukum.name> Cc: David Kubicek <dave@awk.cz> Cc: Johan Hovold <jhovold@gmail.com> Cc: Brad Hards <bhards@bigpond.net.au> Acked-by: Felipe Balbi <balbi@ti.com> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Thomas Dahlmann <dahlmann.thomas@arcor.de> Cc: David Brownell <david-b@pacbell.net> Cc: David Lopo <dlopo@chipidea.mips.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Michal Nazarewicz <m.nazarewicz@samsung.com> Cc: Xie Xiaobo <X.Xie@freescale.com> Cc: Li Yang <leoli@freescale.com> Cc: Jiang Bo <tanya.jiang@freescale.com> Cc: Yuan-hsin Chen <yhchen@faraday-tech.com> Cc: Darius Augulis <augulis.darius@gmail.com> Cc: Xiaochen Shen <xiaochen.shen@intel.com> Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Cc: OKI SEMICONDUCTOR, <toshiharu-linux@dsn.okisemi.com> Cc: Robert Jarzmik <robert.jarzmik@free.fr> Cc: Ben Dooks <ben@simtec.co.uk> Cc: Thomas Abraham <thomas.ab@samsung.com> Cc: Herbert Pötzl <herbert@13thfloor.at> Cc: Arnaud Patard <arnaud.patard@rtp-net.org> Cc: Roman Weissgaerber <weissg@vienna.at> Acked-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Cc: Tony Olech <tony.olech@elandigitalsystems.com> Cc: Florian Floe Echtler <echtler@fs.tum.de> Cc: Christian Lucht <lucht@codemercs.com> Cc: Juergen Stuber <starblue@sourceforge.net> Cc: Georges Toth <g.toth@e-biz.lu> Cc: Bill Ryder <bryder@sgi.com> Cc: Kuba Ober <kuba@mareimbrium.org> Cc: Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-08-23 12:12:03 +02:00
max_size = usb_endpoint_maxp(desc);
}
if (max_size == 0) {
dev_err(dev, "Couldn't get wMaxPacketSize\n");
rv = -EPERM;
goto exit;
}
dev_dbg(dev, "wMaxPacketSize is %d\n", max_size);
n = 0;
usbtmc_clear_check_status:
dev_dbg(dev, "Sending CHECK_CLEAR_STATUS request\n");
rv = usb_control_msg(data->usb_dev,
usb_rcvctrlpipe(data->usb_dev, 0),
USBTMC_REQUEST_CHECK_CLEAR_STATUS,
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
0, 0, buffer, 2, USBTMC_TIMEOUT);
if (rv < 0) {
dev_err(dev, "usb_control_msg returned %d\n", rv);
goto exit;
}
dev_dbg(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]);
if (buffer[0] == USBTMC_STATUS_SUCCESS)
goto usbtmc_clear_bulk_out_halt;
if (buffer[0] != USBTMC_STATUS_PENDING) {
dev_err(dev, "CHECK_CLEAR_STATUS returned %x\n", buffer[0]);
rv = -EPERM;
goto exit;
}
if (buffer[1] == 1)
do {
dev_dbg(dev, "Reading from bulk in EP\n");
rv = usb_bulk_msg(data->usb_dev,
usb_rcvbulkpipe(data->usb_dev,
data->bulk_in),
buffer, USBTMC_SIZE_IOBUFFER,
&actual, USBTMC_TIMEOUT);
n++;
if (rv < 0) {
dev_err(dev, "usb_control_msg returned %d\n",
rv);
goto exit;
}
} while ((actual == max_size) &&
(n < USBTMC_MAX_READS_TO_CLEAR_BULK_IN));
if (actual == max_size) {
dev_err(dev, "Couldn't clear device buffer within %d cycles\n",
USBTMC_MAX_READS_TO_CLEAR_BULK_IN);
rv = -EPERM;
goto exit;
}
goto usbtmc_clear_check_status;
usbtmc_clear_bulk_out_halt:
rv = usb_clear_halt(data->usb_dev,
usb_sndbulkpipe(data->usb_dev, data->bulk_out));
if (rv < 0) {
dev_err(dev, "usb_control_msg returned %d\n", rv);
goto exit;
}
rv = 0;
exit:
kfree(buffer);
return rv;
}
static int usbtmc_ioctl_clear_out_halt(struct usbtmc_device_data *data)
{
int rv;
rv = usb_clear_halt(data->usb_dev,
usb_sndbulkpipe(data->usb_dev, data->bulk_out));
if (rv < 0) {
dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n",
rv);
return rv;
}
return 0;
}
static int usbtmc_ioctl_clear_in_halt(struct usbtmc_device_data *data)
{
int rv;
rv = usb_clear_halt(data->usb_dev,
usb_rcvbulkpipe(data->usb_dev, data->bulk_in));
if (rv < 0) {
dev_err(&data->usb_dev->dev, "usb_control_msg returned %d\n",
rv);
return rv;
}
return 0;
}
static int get_capabilities(struct usbtmc_device_data *data)
{
struct device *dev = &data->usb_dev->dev;
char *buffer;
int rv = 0;
buffer = kmalloc(0x18, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
rv = usb_control_msg(data->usb_dev, usb_rcvctrlpipe(data->usb_dev, 0),
USBTMC_REQUEST_GET_CAPABILITIES,
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
0, 0, buffer, 0x18, USBTMC_TIMEOUT);
if (rv < 0) {
dev_err(dev, "usb_control_msg returned %d\n", rv);
goto err_out;
}
dev_dbg(dev, "GET_CAPABILITIES returned %x\n", buffer[0]);
if (buffer[0] != USBTMC_STATUS_SUCCESS) {
dev_err(dev, "GET_CAPABILITIES returned %x\n", buffer[0]);
rv = -EPERM;
goto err_out;
}
dev_dbg(dev, "Interface capabilities are %x\n", buffer[4]);
dev_dbg(dev, "Device capabilities are %x\n", buffer[5]);
dev_dbg(dev, "USB488 interface capabilities are %x\n", buffer[14]);
dev_dbg(dev, "USB488 device capabilities are %x\n", buffer[15]);
data->capabilities.interface_capabilities = buffer[4];
data->capabilities.device_capabilities = buffer[5];
data->capabilities.usb488_interface_capabilities = buffer[14];
data->capabilities.usb488_device_capabilities = buffer[15];
data->usb488_caps = (buffer[14] & 0x07) | ((buffer[15] & 0x0f) << 4);
rv = 0;
err_out:
kfree(buffer);
return rv;
}
#define capability_attribute(name) \
static ssize_t name##_show(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct usb_interface *intf = to_usb_interface(dev); \
struct usbtmc_device_data *data = usb_get_intfdata(intf); \
\
return sprintf(buf, "%d\n", data->capabilities.name); \
} \
static DEVICE_ATTR_RO(name)
capability_attribute(interface_capabilities);
capability_attribute(device_capabilities);
capability_attribute(usb488_interface_capabilities);
capability_attribute(usb488_device_capabilities);
static struct attribute *capability_attrs[] = {
&dev_attr_interface_capabilities.attr,
&dev_attr_device_capabilities.attr,
&dev_attr_usb488_interface_capabilities.attr,
&dev_attr_usb488_device_capabilities.attr,
NULL,
};
static const struct attribute_group capability_attr_grp = {
.attrs = capability_attrs,
};
static ssize_t TermChar_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct usb_interface *intf = to_usb_interface(dev);
struct usbtmc_device_data *data = usb_get_intfdata(intf);
return sprintf(buf, "%c\n", data->TermChar);
}
static ssize_t TermChar_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct usb_interface *intf = to_usb_interface(dev);
struct usbtmc_device_data *data = usb_get_intfdata(intf);
if (count < 1)
return -EINVAL;
data->TermChar = buf[0];
return count;
}
static DEVICE_ATTR_RW(TermChar);
#define data_attribute(name) \
static ssize_t name##_show(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct usb_interface *intf = to_usb_interface(dev); \
struct usbtmc_device_data *data = usb_get_intfdata(intf); \
\
return sprintf(buf, "%d\n", data->name); \
} \
static ssize_t name##_store(struct device *dev, \
struct device_attribute *attr, \
const char *buf, size_t count) \
{ \
struct usb_interface *intf = to_usb_interface(dev); \
struct usbtmc_device_data *data = usb_get_intfdata(intf); \
ssize_t result; \
unsigned val; \
\
result = sscanf(buf, "%u\n", &val); \
if (result != 1) \
result = -EINVAL; \
data->name = val; \
if (result < 0) \
return result; \
else \
return count; \
} \
static DEVICE_ATTR_RW(name)
data_attribute(TermCharEnabled);
data_attribute(auto_abort);
static struct attribute *data_attrs[] = {
&dev_attr_TermChar.attr,
&dev_attr_TermCharEnabled.attr,
&dev_attr_auto_abort.attr,
NULL,
};
static const struct attribute_group data_attr_grp = {
.attrs = data_attrs,
};
static int usbtmc_ioctl_indicator_pulse(struct usbtmc_device_data *data)
{
struct device *dev;
u8 *buffer;
int rv;
dev = &data->intf->dev;
buffer = kmalloc(2, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
rv = usb_control_msg(data->usb_dev,
usb_rcvctrlpipe(data->usb_dev, 0),
USBTMC_REQUEST_INDICATOR_PULSE,
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
0, 0, buffer, 0x01, USBTMC_TIMEOUT);
if (rv < 0) {
dev_err(dev, "usb_control_msg returned %d\n", rv);
goto exit;
}
dev_dbg(dev, "INDICATOR_PULSE returned %x\n", buffer[0]);
if (buffer[0] != USBTMC_STATUS_SUCCESS) {
dev_err(dev, "INDICATOR_PULSE returned %x\n", buffer[0]);
rv = -EPERM;
goto exit;
}
rv = 0;
exit:
kfree(buffer);
return rv;
}
static int usbtmc_ioctl_request(struct usbtmc_device_data *data,
void __user *arg)
{
struct device *dev = &data->intf->dev;
struct usbtmc_ctrlrequest request;
u8 *buffer = NULL;
int rv;
unsigned long res;
res = copy_from_user(&request, arg, sizeof(struct usbtmc_ctrlrequest));
if (res)
return -EFAULT;
buffer = kmalloc(request.req.wLength, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
if (request.req.wLength > USBTMC_BUFSIZE)
return -EMSGSIZE;
if (request.req.wLength) {
buffer = kmalloc(request.req.wLength, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
if ((request.req.bRequestType & USB_DIR_IN) == 0) {
/* Send control data to device */
res = copy_from_user(buffer, request.data,
request.req.wLength);
if (res) {
rv = -EFAULT;
goto exit;
}
}
}
rv = usb_control_msg(data->usb_dev,
usb_rcvctrlpipe(data->usb_dev, 0),
request.req.bRequest,
request.req.bRequestType,
request.req.wValue,
request.req.wIndex,
buffer, request.req.wLength, USB_CTRL_GET_TIMEOUT);
if (rv < 0) {
dev_err(dev, "%s failed %d\n", __func__, rv);
goto exit;
}
if (rv && (request.req.bRequestType & USB_DIR_IN)) {
/* Read control data from device */
res = copy_to_user(request.data, buffer, rv);
if (res)
rv = -EFAULT;
}
exit:
kfree(buffer);
return rv;
}
/*
* Get the usb timeout value
*/
static int usbtmc_ioctl_get_timeout(struct usbtmc_file_data *file_data,
void __user *arg)
{
u32 timeout;
timeout = file_data->timeout;
return put_user(timeout, (__u32 __user *)arg);
}
/*
* Set the usb timeout value
*/
static int usbtmc_ioctl_set_timeout(struct usbtmc_file_data *file_data,
void __user *arg)
{
u32 timeout;
if (get_user(timeout, (__u32 __user *)arg))
return -EFAULT;
/* Note that timeout = 0 means
* MAX_SCHEDULE_TIMEOUT in usb_control_msg
*/
if (timeout < USBTMC_MIN_TIMEOUT)
return -EINVAL;
file_data->timeout = timeout;
return 0;
}
/*
* enables/disables sending EOM on write
*/
static int usbtmc_ioctl_eom_enable(struct usbtmc_file_data *file_data,
void __user *arg)
{
u8 eom_enable;
if (copy_from_user(&eom_enable, arg, sizeof(eom_enable)))
return -EFAULT;
if (eom_enable > 1)
return -EINVAL;
file_data->eom_val = eom_enable;
return 0;
}
/*
* Configure termination character for read()
*/
static int usbtmc_ioctl_config_termc(struct usbtmc_file_data *file_data,
void __user *arg)
{
struct usbtmc_termchar termc;
if (copy_from_user(&termc, arg, sizeof(termc)))
return -EFAULT;
if ((termc.term_char_enabled > 1) ||
(termc.term_char_enabled &&
!(file_data->data->capabilities.device_capabilities & 1)))
return -EINVAL;
file_data->term_char = termc.term_char;
file_data->term_char_enabled = termc.term_char_enabled;
return 0;
}
static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct usbtmc_file_data *file_data;
struct usbtmc_device_data *data;
int retval = -EBADRQC;
file_data = file->private_data;
data = file_data->data;
mutex_lock(&data->io_mutex);
if (data->zombie) {
retval = -ENODEV;
goto skip_io_on_zombie;
}
switch (cmd) {
case USBTMC_IOCTL_CLEAR_OUT_HALT:
retval = usbtmc_ioctl_clear_out_halt(data);
break;
case USBTMC_IOCTL_CLEAR_IN_HALT:
retval = usbtmc_ioctl_clear_in_halt(data);
break;
case USBTMC_IOCTL_INDICATOR_PULSE:
retval = usbtmc_ioctl_indicator_pulse(data);
break;
case USBTMC_IOCTL_CLEAR:
retval = usbtmc_ioctl_clear(data);
break;
case USBTMC_IOCTL_ABORT_BULK_OUT:
retval = usbtmc_ioctl_abort_bulk_out(data);
break;
case USBTMC_IOCTL_ABORT_BULK_IN:
retval = usbtmc_ioctl_abort_bulk_in(data);
break;
case USBTMC_IOCTL_CTRL_REQUEST:
retval = usbtmc_ioctl_request(data, (void __user *)arg);
break;
case USBTMC_IOCTL_GET_TIMEOUT:
retval = usbtmc_ioctl_get_timeout(file_data,
(void __user *)arg);
break;
case USBTMC_IOCTL_SET_TIMEOUT:
retval = usbtmc_ioctl_set_timeout(file_data,
(void __user *)arg);
break;
case USBTMC_IOCTL_EOM_ENABLE:
retval = usbtmc_ioctl_eom_enable(file_data,
(void __user *)arg);
break;
case USBTMC_IOCTL_CONFIG_TERMCHAR:
retval = usbtmc_ioctl_config_termc(file_data,
(void __user *)arg);
break;
case USBTMC488_IOCTL_GET_CAPS:
retval = copy_to_user((void __user *)arg,
&data->usb488_caps,
sizeof(data->usb488_caps));
if (retval)
retval = -EFAULT;
break;
case USBTMC488_IOCTL_READ_STB:
retval = usbtmc488_ioctl_read_stb(file_data,
(void __user *)arg);
break;
case USBTMC488_IOCTL_REN_CONTROL:
retval = usbtmc488_ioctl_simple(data, (void __user *)arg,
USBTMC488_REQUEST_REN_CONTROL);
break;
case USBTMC488_IOCTL_GOTO_LOCAL:
retval = usbtmc488_ioctl_simple(data, (void __user *)arg,
USBTMC488_REQUEST_GOTO_LOCAL);
break;
case USBTMC488_IOCTL_LOCAL_LOCKOUT:
retval = usbtmc488_ioctl_simple(data, (void __user *)arg,
USBTMC488_REQUEST_LOCAL_LOCKOUT);
break;
case USBTMC488_IOCTL_TRIGGER:
retval = usbtmc488_ioctl_trigger(file_data);
break;
}
skip_io_on_zombie:
mutex_unlock(&data->io_mutex);
return retval;
}
static int usbtmc_fasync(int fd, struct file *file, int on)
{
struct usbtmc_file_data *file_data = file->private_data;
return fasync_helper(fd, file, on, &file_data->data->fasync);
}
static __poll_t usbtmc_poll(struct file *file, poll_table *wait)
{
struct usbtmc_file_data *file_data = file->private_data;
struct usbtmc_device_data *data = file_data->data;
__poll_t mask;
mutex_lock(&data->io_mutex);
if (data->zombie) {
mask = EPOLLHUP | EPOLLERR;
goto no_poll;
}
poll_wait(file, &data->waitq, wait);
mask = (atomic_read(&file_data->srq_asserted)) ? EPOLLPRI : 0;
no_poll:
mutex_unlock(&data->io_mutex);
return mask;
}
static const struct file_operations fops = {
.owner = THIS_MODULE,
.read = usbtmc_read,
.write = usbtmc_write,
.open = usbtmc_open,
.release = usbtmc_release,
.unlocked_ioctl = usbtmc_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = usbtmc_ioctl,
#endif
.fasync = usbtmc_fasync,
.poll = usbtmc_poll,
llseek: automatically add .llseek fop All file_operations should get a .llseek operation so we can make nonseekable_open the default for future file operations without a .llseek pointer. The three cases that we can automatically detect are no_llseek, seq_lseek and default_llseek. For cases where we can we can automatically prove that the file offset is always ignored, we use noop_llseek, which maintains the current behavior of not returning an error from a seek. New drivers should normally not use noop_llseek but instead use no_llseek and call nonseekable_open at open time. Existing drivers can be converted to do the same when the maintainer knows for certain that no user code relies on calling seek on the device file. The generated code is often incorrectly indented and right now contains comments that clarify for each added line why a specific variant was chosen. In the version that gets submitted upstream, the comments will be gone and I will manually fix the indentation, because there does not seem to be a way to do that using coccinelle. Some amount of new code is currently sitting in linux-next that should get the same modifications, which I will do at the end of the merge window. Many thanks to Julia Lawall for helping me learn to write a semantic patch that does all this. ===== begin semantic patch ===== // This adds an llseek= method to all file operations, // as a preparation for making no_llseek the default. // // The rules are // - use no_llseek explicitly if we do nonseekable_open // - use seq_lseek for sequential files // - use default_llseek if we know we access f_pos // - use noop_llseek if we know we don't access f_pos, // but we still want to allow users to call lseek // @ open1 exists @ identifier nested_open; @@ nested_open(...) { <+... nonseekable_open(...) ...+> } @ open exists@ identifier open_f; identifier i, f; identifier open1.nested_open; @@ int open_f(struct inode *i, struct file *f) { <+... ( nonseekable_open(...) | nested_open(...) ) ...+> } @ read disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ read_no_fpos disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { ... when != off } @ write @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ write_no_fpos @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { ... when != off } @ fops0 @ identifier fops; @@ struct file_operations fops = { ... }; @ has_llseek depends on fops0 @ identifier fops0.fops; identifier llseek_f; @@ struct file_operations fops = { ... .llseek = llseek_f, ... }; @ has_read depends on fops0 @ identifier fops0.fops; identifier read_f; @@ struct file_operations fops = { ... .read = read_f, ... }; @ has_write depends on fops0 @ identifier fops0.fops; identifier write_f; @@ struct file_operations fops = { ... .write = write_f, ... }; @ has_open depends on fops0 @ identifier fops0.fops; identifier open_f; @@ struct file_operations fops = { ... .open = open_f, ... }; // use no_llseek if we call nonseekable_open //////////////////////////////////////////// @ nonseekable1 depends on !has_llseek && has_open @ identifier fops0.fops; identifier nso ~= "nonseekable_open"; @@ struct file_operations fops = { ... .open = nso, ... +.llseek = no_llseek, /* nonseekable */ }; @ nonseekable2 depends on !has_llseek @ identifier fops0.fops; identifier open.open_f; @@ struct file_operations fops = { ... .open = open_f, ... +.llseek = no_llseek, /* open uses nonseekable */ }; // use seq_lseek for sequential files ///////////////////////////////////// @ seq depends on !has_llseek @ identifier fops0.fops; identifier sr ~= "seq_read"; @@ struct file_operations fops = { ... .read = sr, ... +.llseek = seq_lseek, /* we have seq_read */ }; // use default_llseek if there is a readdir /////////////////////////////////////////// @ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier readdir_e; @@ // any other fop is used that changes pos struct file_operations fops = { ... .readdir = readdir_e, ... +.llseek = default_llseek, /* readdir is present */ }; // use default_llseek if at least one of read/write touches f_pos ///////////////////////////////////////////////////////////////// @ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read.read_f; @@ // read fops use offset struct file_operations fops = { ... .read = read_f, ... +.llseek = default_llseek, /* read accesses f_pos */ }; @ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, ... + .llseek = default_llseek, /* write accesses f_pos */ }; // Use noop_llseek if neither read nor write accesses f_pos /////////////////////////////////////////////////////////// @ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; identifier write_no_fpos.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, .read = read_f, ... +.llseek = noop_llseek, /* read and write both use no f_pos */ }; @ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write_no_fpos.write_f; @@ struct file_operations fops = { ... .write = write_f, ... +.llseek = noop_llseek, /* write uses no f_pos */ }; @ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; @@ struct file_operations fops = { ... .read = read_f, ... +.llseek = noop_llseek, /* read uses no f_pos */ }; @ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; @@ struct file_operations fops = { ... +.llseek = noop_llseek, /* no read or write fn */ }; ===== End semantic patch ===== Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Julia Lawall <julia@diku.dk> Cc: Christoph Hellwig <hch@infradead.org>
2010-08-15 18:52:59 +02:00
.llseek = default_llseek,
};
static struct usb_class_driver usbtmc_class = {
.name = "usbtmc%d",
.fops = &fops,
.minor_base = USBTMC_MINOR_BASE,
};
static void usbtmc_interrupt(struct urb *urb)
{
struct usbtmc_device_data *data = urb->context;
struct device *dev = &data->intf->dev;
int status = urb->status;
int rv;
dev_dbg(&data->intf->dev, "int status: %d len %d\n",
status, urb->actual_length);
switch (status) {
case 0: /* SUCCESS */
/* check for valid STB notification */
if (data->iin_buffer[0] > 0x81) {
data->bNotify1 = data->iin_buffer[0];
data->bNotify2 = data->iin_buffer[1];
atomic_set(&data->iin_data_valid, 1);
wake_up_interruptible(&data->waitq);
goto exit;
}
/* check for SRQ notification */
if (data->iin_buffer[0] == 0x81) {
unsigned long flags;
struct list_head *elem;
if (data->fasync)
kill_fasync(&data->fasync,
SIGIO, POLL_PRI);
spin_lock_irqsave(&data->dev_lock, flags);
list_for_each(elem, &data->file_list) {
struct usbtmc_file_data *file_data;
file_data = list_entry(elem,
struct usbtmc_file_data,
file_elem);
file_data->srq_byte = data->iin_buffer[1];
atomic_set(&file_data->srq_asserted, 1);
}
spin_unlock_irqrestore(&data->dev_lock, flags);
dev_dbg(dev, "srq received bTag %x stb %x\n",
(unsigned int)data->iin_buffer[0],
(unsigned int)data->iin_buffer[1]);
wake_up_interruptible_all(&data->waitq);
goto exit;
}
dev_warn(dev, "invalid notification: %x\n",
data->iin_buffer[0]);
break;
case -EOVERFLOW:
dev_err(dev, "overflow with length %d, actual length is %d\n",
data->iin_wMaxPacketSize, urb->actual_length);
/* fall through */
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
case -EILSEQ:
case -ETIME:
case -EPIPE:
/* urb terminated, clean up */
dev_dbg(dev, "urb terminated, status: %d\n", status);
return;
default:
dev_err(dev, "unknown status received: %d\n", status);
}
exit:
rv = usb_submit_urb(urb, GFP_ATOMIC);
if (rv)
dev_err(dev, "usb_submit_urb failed: %d\n", rv);
}
static void usbtmc_free_int(struct usbtmc_device_data *data)
{
if (!data->iin_ep_present || !data->iin_urb)
return;
usb_kill_urb(data->iin_urb);
kfree(data->iin_buffer);
usb_free_urb(data->iin_urb);
kref_put(&data->kref, usbtmc_delete);
}
static int usbtmc_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct usbtmc_device_data *data;
struct usb_host_interface *iface_desc;
struct usb_endpoint_descriptor *bulk_in, *bulk_out, *int_in;
int retcode;
dev_dbg(&intf->dev, "%s called\n", __func__);
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->intf = intf;
data->id = id;
data->usb_dev = usb_get_dev(interface_to_usbdev(intf));
usb_set_intfdata(intf, data);
kref_init(&data->kref);
mutex_init(&data->io_mutex);
init_waitqueue_head(&data->waitq);
atomic_set(&data->iin_data_valid, 0);
INIT_LIST_HEAD(&data->file_list);
spin_lock_init(&data->dev_lock);
data->zombie = 0;
/* Initialize USBTMC bTag and other fields */
data->bTag = 1;
data->TermCharEnabled = 0;
data->TermChar = '\n';
/* 2 <= bTag <= 127 USBTMC-USB488 subclass specification 4.3.1 */
data->iin_bTag = 2;
/* USBTMC devices have only one setting, so use that */
iface_desc = data->intf->cur_altsetting;
data->ifnum = iface_desc->desc.bInterfaceNumber;
/* Find bulk endpoints */
retcode = usb_find_common_endpoints(iface_desc,
&bulk_in, &bulk_out, NULL, NULL);
if (retcode) {
dev_err(&intf->dev, "bulk endpoints not found\n");
goto err_put;
}
data->bulk_in = bulk_in->bEndpointAddress;
dev_dbg(&intf->dev, "Found bulk in endpoint at %u\n", data->bulk_in);
data->bulk_out = bulk_out->bEndpointAddress;
dev_dbg(&intf->dev, "Found Bulk out endpoint at %u\n", data->bulk_out);
/* Find int endpoint */
retcode = usb_find_int_in_endpoint(iface_desc, &int_in);
if (!retcode) {
data->iin_ep_present = 1;
data->iin_ep = int_in->bEndpointAddress;
data->iin_wMaxPacketSize = usb_endpoint_maxp(int_in);
data->iin_interval = int_in->bInterval;
dev_dbg(&intf->dev, "Found Int in endpoint at %u\n",
data->iin_ep);
}
retcode = get_capabilities(data);
if (retcode)
dev_err(&intf->dev, "can't read capabilities\n");
else
retcode = sysfs_create_group(&intf->dev.kobj,
&capability_attr_grp);
if (data->iin_ep_present) {
/* allocate int urb */
data->iin_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!data->iin_urb) {
retcode = -ENOMEM;
goto error_register;
}
/* Protect interrupt in endpoint data until iin_urb is freed */
kref_get(&data->kref);
/* allocate buffer for interrupt in */
data->iin_buffer = kmalloc(data->iin_wMaxPacketSize,
GFP_KERNEL);
if (!data->iin_buffer) {
retcode = -ENOMEM;
goto error_register;
}
/* fill interrupt urb */
usb_fill_int_urb(data->iin_urb, data->usb_dev,
usb_rcvintpipe(data->usb_dev, data->iin_ep),
data->iin_buffer, data->iin_wMaxPacketSize,
usbtmc_interrupt,
data, data->iin_interval);
retcode = usb_submit_urb(data->iin_urb, GFP_KERNEL);
if (retcode) {
dev_err(&intf->dev, "Failed to submit iin_urb\n");
goto error_register;
}
}
retcode = sysfs_create_group(&intf->dev.kobj, &data_attr_grp);
retcode = usb_register_dev(intf, &usbtmc_class);
if (retcode) {
dev_err(&intf->dev, "Not able to get a minor"
" (base %u, slice default): %d\n", USBTMC_MINOR_BASE,
retcode);
goto error_register;
}
dev_dbg(&intf->dev, "Using minor number %d\n", intf->minor);
return 0;
error_register:
sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
usbtmc_free_int(data);
err_put:
kref_put(&data->kref, usbtmc_delete);
return retcode;
}
static void usbtmc_disconnect(struct usb_interface *intf)
{
struct usbtmc_device_data *data = usb_get_intfdata(intf);
usb_deregister_dev(intf, &usbtmc_class);
sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
mutex_lock(&data->io_mutex);
data->zombie = 1;
wake_up_interruptible_all(&data->waitq);
mutex_unlock(&data->io_mutex);
usbtmc_free_int(data);
kref_put(&data->kref, usbtmc_delete);
}
static int usbtmc_suspend(struct usb_interface *intf, pm_message_t message)
{
/* this driver does not have pending URBs */
return 0;
}
static int usbtmc_resume(struct usb_interface *intf)
{
return 0;
}
static struct usb_driver usbtmc_driver = {
.name = "usbtmc",
.id_table = usbtmc_devices,
.probe = usbtmc_probe,
.disconnect = usbtmc_disconnect,
.suspend = usbtmc_suspend,
.resume = usbtmc_resume,
};
module_usb_driver(usbtmc_driver);
MODULE_LICENSE("GPL");