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Commit a2cb0a8f authored by Sean Young's avatar Sean Young Committed by Greg Kroah-Hartman
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[PATCH] USB: PhidgetServo driver fixes 

Here is a patch for the phidgetservo driver -- it was using memory after
kfree(), and using driver_info is much nicer. :)
Signed-off-by: default avatarGreg Kroah-Hartman <greg@kroah.com>
parent ce145ab2
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Showing with 62 additions and 53 deletions
drivers/usb/misc/phidgetservo.c
View file @ a2cb0a8f
......@@ -17,6 +17,10 @@
*
* CAUTION: Generally you should use 0 < degrees < 180 as anything else
* is probably beyond the range of your servo and may damage it.
*
* Jun 16, 2004: Sean Young <sean@mess.org>
* - cleanups
* - was using memory after kfree()
*/
#include <linux/config.h>
......@@ -34,18 +38,35 @@
#define DRIVER_DESC "USB PhidgetServo Driver"
#define VENDOR_ID_GLAB 0x06c2
#define DEVICE_ID_4MOTOR_SERVO_30 0x0038
#define DEVICE_ID_1MOTOR_SERVO_30 0x0039
#define DEVICE_ID_GLAB_PHIDGETSERVO_QUAD 0x0038
#define DEVICE_ID_GLAB_PHIDGETSERVO_UNI 0x0039
#define VENDOR_ID_WISEGROUP 0x0925
#define DEVICE_ID_1MOTOR_SERVO_20 0x8101
#define DEVICE_ID_4MOTOR_SERVO_20 0x8104
#define VENDOR_ID_WISEGROUP_PHIDGETSERVO_QUAD 0x8101
#define VENDOR_ID_WISEGROUP_PHIDGETSERVO_UNI 0x8104
#define SERVO_VERSION_30 0x01
#define SERVO_COUNT_QUAD 0x02
static struct usb_device_id id_table[] = {
{USB_DEVICE(VENDOR_ID_GLAB, DEVICE_ID_4MOTOR_SERVO_30)},
{USB_DEVICE(VENDOR_ID_GLAB, DEVICE_ID_1MOTOR_SERVO_30)},
{USB_DEVICE(VENDOR_ID_WISEGROUP, DEVICE_ID_4MOTOR_SERVO_20)},
{USB_DEVICE(VENDOR_ID_WISEGROUP, DEVICE_ID_1MOTOR_SERVO_20)},
{
USB_DEVICE(VENDOR_ID_GLAB, DEVICE_ID_GLAB_PHIDGETSERVO_QUAD),
.driver_info = SERVO_VERSION_30 | SERVO_COUNT_QUAD
},
{
USB_DEVICE(VENDOR_ID_GLAB, DEVICE_ID_GLAB_PHIDGETSERVO_UNI),
.driver_info = SERVO_VERSION_30
},
{
USB_DEVICE(VENDOR_ID_WISEGROUP,
VENDOR_ID_WISEGROUP_PHIDGETSERVO_QUAD),
.driver_info = SERVO_COUNT_QUAD
},
{
USB_DEVICE(VENDOR_ID_WISEGROUP,
VENDOR_ID_WISEGROUP_PHIDGETSERVO_UNI),
.driver_info = 0
},
{}
};
......@@ -53,14 +74,13 @@ MODULE_DEVICE_TABLE(usb, id_table);
struct phidget_servo {
struct usb_device *udev;
int version;
int quad_servo;
ulong type;
int pulse[4];
int degrees[4];
int minutes[4];
};
static void
static int
change_position_v30(struct phidget_servo *servo, int servo_no, int degrees,
int minutes)
{
......@@ -71,7 +91,7 @@ change_position_v30(struct phidget_servo *servo, int servo_no, int degrees,
if (!buffer) {
dev_err(&servo->udev->dev, "%s - out of memory\n",
__FUNCTION__);
return;
return -ENOMEM;
}
/*
......@@ -124,12 +144,13 @@ change_position_v30(struct phidget_servo *servo, int servo_no, int degrees,
retval = usb_control_msg(servo->udev,
usb_sndctrlpipe(servo->udev, 0),
0x09, 0x21, 0x0200, 0x0000, buffer, 6, 2 * HZ);
if (retval != 6)
dev_err(&servo->udev->dev, "retval = %d\n", retval);
kfree(buffer);
return retval;
}
static void
static int
change_position_v20(struct phidget_servo *servo, int servo_no, int degrees,
int minutes)
{
......@@ -140,7 +161,7 @@ change_position_v20(struct phidget_servo *servo, int servo_no, int degrees,
if (!buffer) {
dev_err(&servo->udev->dev, "%s - out of memory\n",
__FUNCTION__);
return;
return -ENOMEM;
}
/*
......@@ -171,16 +192,17 @@ change_position_v20(struct phidget_servo *servo, int servo_no, int degrees,
retval = usb_control_msg(servo->udev,
usb_sndctrlpipe(servo->udev, 0),
0x09, 0x21, 0x0200, 0x0000, buffer, 2, 2 * HZ);
if (retval != 2)
dev_err(&servo->udev->dev, "retval = %d\n", retval);
kfree(buffer);
return retval;
}
#define show_set(value) \
static ssize_t set_servo##value (struct device *dev, \
const char *buf, size_t count) \
{ \
int degrees, minutes; \
int degrees, minutes, retval; \
struct usb_interface *intf = to_usb_interface (dev); \
struct phidget_servo *servo = usb_get_intfdata (intf); \
\
......@@ -195,12 +217,14 @@ static ssize_t set_servo##value (struct device *dev, \
return -EINVAL; \
} \
\
if (servo->version >= 3) \
change_position_v30 (servo, value, degrees, minutes); \
if (servo->type & SERVO_VERSION_30) \
retval = change_position_v30 (servo, value, degrees, \
minutes); \
else \
change_position_v20 (servo, value, degrees, minutes); \
retval = change_position_v20 (servo, value, degrees, \
minutes); \
\
return count; \
return retval < 0 ? retval : count; \
} \
\
static ssize_t show_servo##value (struct device *dev, char *buf) \
......@@ -223,7 +247,7 @@ static int
servo_probe(struct usb_interface *interface, const struct usb_device_id *id)
{
struct usb_device *udev = interface_to_usbdev(interface);
struct phidget_servo *dev = NULL;
struct phidget_servo *dev;
dev = kmalloc(sizeof (struct phidget_servo), GFP_KERNEL);
if (dev == NULL) {
......@@ -233,37 +257,21 @@ servo_probe(struct usb_interface *interface, const struct usb_device_id *id)
memset(dev, 0x00, sizeof (*dev));
dev->udev = usb_get_dev(udev);
switch (udev->descriptor.idVendor) {
case VENDOR_ID_WISEGROUP:
dev->version = 2;
break;
case VENDOR_ID_GLAB:
dev->version = 3;
break;
}
switch (udev->descriptor.idProduct) {
case DEVICE_ID_4MOTOR_SERVO_20:
case DEVICE_ID_4MOTOR_SERVO_30:
dev->quad_servo = 1;
break;
case DEVICE_ID_1MOTOR_SERVO_20:
case DEVICE_ID_1MOTOR_SERVO_30:
dev->quad_servo = 0;
break;
}
dev->type = id->driver_info;
usb_set_intfdata(interface, dev);
device_create_file(&interface->dev, &dev_attr_servo0);
if (dev->quad_servo) {
if (dev->type & SERVO_COUNT_QUAD) {
device_create_file(&interface->dev, &dev_attr_servo1);
device_create_file(&interface->dev, &dev_attr_servo2);
device_create_file(&interface->dev, &dev_attr_servo3);
}
dev_info(&interface->dev, "USB %d-Motor PhidgetServo v%d.0 attached\n",
dev->quad_servo ? 4 : 1, dev->version);
if (dev->version == 2)
dev->type & SERVO_COUNT_QUAD ? 4 : 1,
dev->type & SERVO_VERSION_30 ? 3 : 2);
if(!(dev->type & SERVO_VERSION_30))
dev_info(&interface->dev,
"WARNING: v2.0 not tested! Please report if it works.\n");
......@@ -279,7 +287,7 @@ servo_disconnect(struct usb_interface *interface)
usb_set_intfdata(interface, NULL);
device_remove_file(&interface->dev, &dev_attr_servo0);
if (dev->quad_servo) {
if (dev->type & SERVO_COUNT_QUAD) {
device_remove_file(&interface->dev, &dev_attr_servo1);
device_remove_file(&interface->dev, &dev_attr_servo2);
device_remove_file(&interface->dev, &dev_attr_servo3);
......@@ -287,10 +295,11 @@ servo_disconnect(struct usb_interface *interface)
usb_put_dev(dev->udev);
kfree(dev);
dev_info(&interface->dev, "USB %d-Motor PhidgetServo v%d.0 detached\n",
dev->quad_servo ? 4 : 1, dev->version);
dev->type & SERVO_COUNT_QUAD ? 4 : 1,
dev->type & SERVO_VERSION_30 ? 3 : 2);
kfree(dev);
}
static struct usb_driver servo_driver = {
......@@ -304,7 +313,7 @@ static struct usb_driver servo_driver = {
static int __init
phidget_servo_init(void)
{
int retval = 0;
int retval;
retval = usb_register(&servo_driver);
if (retval)
......
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