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usb: usbtmc: Remove rigol_quirk 

All T&M instruments should also work with rigol_quirk = 1 code path.
So remove unnecessary code in rigol_quirk = 0 code path to simplify the driver.

Tested-by: Dave Penkler <dpenkler@gmail.com>
Reviewed-by: Steve Bayless <steve_bayless@keysight.com>
Signed-off-by: Guido Kiener <guido.kiener@rohde-schwarz.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Guido Kiener 2018-05-17 19:03:25 +02:00 committed by Greg Kroah-Hartman
parent 58318cd4df
commit baf12d6dde
1 changed files with 12 additions and 69 deletions
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81
drivers/usb/class/usbtmc.c
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@ -21,7 +21,6 @@
#include <linux/usb/tmc.h>
#define RIGOL 1
#define USBTMC_HEADER_SIZE 12
#define USBTMC_MINOR_BASE 176
@ -93,8 +92,6 @@ struct usbtmc_device_data {
/* coalesced usb488_caps from usbtmc_dev_capabilities */
__u8 usb488_caps;
u8 rigol_quirk;
/* attributes from the USB TMC spec for this device */
u8 TermChar;
bool TermCharEnabled;
@ -110,17 +107,6 @@ struct usbtmc_device_data {
};
#define to_usbtmc_data(d) container_of(d, struct usbtmc_device_data, kref)
struct usbtmc_ID_rigol_quirk {
__u16 idVendor;
__u16 idProduct;
};
static const struct usbtmc_ID_rigol_quirk usbtmc_id_quirk[] = {
{ 0x1ab1, 0x0588 },
{ 0x1ab1, 0x04b0 },
{ 0, 0 }
};
/* Forward declarations */
static struct usb_driver usbtmc_driver;
@ -603,16 +589,14 @@ static ssize_t usbtmc_read(struct file *filp, char __user *buf,
goto exit;
}
if (data->rigol_quirk) {
dev_dbg(dev, "usb_bulk_msg_in: count(%zu)\n", count);
dev_dbg(dev, "usb_bulk_msg_in: count(%zu)\n", count);
retval = send_request_dev_dep_msg_in(data, count);
retval = send_request_dev_dep_msg_in(data, count);
if (retval < 0) {
if (data->auto_abort)
usbtmc_ioctl_abort_bulk_out(data);
goto exit;
}
if (retval < 0) {
if (data->auto_abort)
usbtmc_ioctl_abort_bulk_out(data);
goto exit;
}
/* Loop until we have fetched everything we requested */
@ -621,23 +605,6 @@ static ssize_t usbtmc_read(struct file *filp, char __user *buf,
done = 0;
while (remaining > 0) {
if (!data->rigol_quirk) {
dev_dbg(dev, "usb_bulk_msg_in: remaining(%zu), count(%zu)\n", remaining, count);
if (remaining > USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE - 3)
this_part = USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE - 3;
else
this_part = remaining;
retval = send_request_dev_dep_msg_in(data, this_part);
if (retval < 0) {
dev_err(dev, "usb_bulk_msg returned %d\n", retval);
if (data->auto_abort)
usbtmc_ioctl_abort_bulk_out(data);
goto exit;
}
}
/* Send bulk URB */
retval = usb_bulk_msg(data->usb_dev,
usb_rcvbulkpipe(data->usb_dev,
@ -658,7 +625,7 @@ static ssize_t usbtmc_read(struct file *filp, char __user *buf,
}
/* Parse header in first packet */
if ((done == 0) || !data->rigol_quirk) {
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);
@ -698,20 +665,11 @@ static ssize_t usbtmc_read(struct file *filp, char __user *buf,
actual -= USBTMC_HEADER_SIZE;
/* Check if the message is smaller than requested */
if (data->rigol_quirk) {
if (remaining > n_characters)
remaining = n_characters;
/* Remove padding if it exists */
if (actual > remaining)
actual = remaining;
}
else {
if (this_part > n_characters)
this_part = n_characters;
/* Remove padding if it exists */
if (actual > this_part)
actual = this_part;
}
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]);
@ -1365,7 +1323,6 @@ static int usbtmc_probe(struct usb_interface *intf,
struct usbtmc_device_data *data;
struct usb_host_interface *iface_desc;
struct usb_endpoint_descriptor *bulk_in, *bulk_out, *int_in;
int n;
int retcode;
dev_dbg(&intf->dev, "%s called\n", __func__);
@ -1385,20 +1342,6 @@ static int usbtmc_probe(struct usb_interface *intf,
atomic_set(&data->srq_asserted, 0);
data->zombie = 0;
/* Determine if it is a Rigol or not */
data->rigol_quirk = 0;
dev_dbg(&intf->dev, "Trying to find if device Vendor 0x%04X Product 0x%04X has the RIGOL quirk\n",
le16_to_cpu(data->usb_dev->descriptor.idVendor),
le16_to_cpu(data->usb_dev->descriptor.idProduct));
for(n = 0; usbtmc_id_quirk[n].idVendor > 0; n++) {
if ((usbtmc_id_quirk[n].idVendor == le16_to_cpu(data->usb_dev->descriptor.idVendor)) &&
(usbtmc_id_quirk[n].idProduct == le16_to_cpu(data->usb_dev->descriptor.idProduct))) {
dev_dbg(&intf->dev, "Setting this device as having the RIGOL quirk\n");
data->rigol_quirk = 1;
break;
}
}
/* Initialize USBTMC bTag and other fields */
data->bTag = 1;
data->TermCharEnabled = 0;