USB: Put phidgets driver in a sysfs class

This patch creates a device class phidget and add the phidget drivers to 
them.

Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 44 insertions, 27 deletions

diff --git a/drivers/usb/misc/phidgetservo.c b/drivers/usb/misc/phidgetservo.c
index c0df79c96538..66be9513fd6f 100644
--- a/drivers/usb/misc/phidgetservo.c
+++ b/drivers/usb/misc/phidgetservo.c
@@ -15,14 +15,6 @@
  *
  * 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()
- * Aug 8, 2004: Sean Young <sean@mess.org>
- *  - set the highest angle as high as the hardware allows, there are 
- *    some odd servos out there
- *
  */
 
 #include <linux/kernel.h>
@@ -32,6 +24,8 @@
 #include <linux/module.h>
 #include <linux/usb.h>
 
+#include "phidget.h"
+
 #define DRIVER_AUTHOR "Sean Young <sean@mess.org>"
 #define DRIVER_DESC "USB PhidgetServo Driver"
 
@@ -70,8 +64,12 @@ static struct usb_device_id id_table[] = {
 
 MODULE_DEVICE_TABLE(usb, id_table);
 
+static int unsigned long device_no;
+
 struct phidget_servo {
         struct usb_device *udev;
+        struct device *dev;
+        int dev_no;
         ulong type;
         int pulse[4];
         int degrees[4];
@@ -203,16 +201,16 @@ change_position_v20(struct phidget_servo *servo, int servo_no, int degrees,
 }
 
 #define show_set(value) \
-static ssize_t set_servo##value (struct device *dev, struct device_attribute *attr,                     \
+static ssize_t set_servo##value (struct device *dev,                    \
+                                        struct device_attribute *attr,  \
                                         const char *buf, size_t count)  \
 {                                                                       \
         int degrees, minutes, retval;                                   \
-        struct usb_interface *intf = to_usb_interface (dev);            \
-        struct phidget_servo *servo = usb_get_intfdata (intf);          \
+        struct phidget_servo *servo = dev_get_drvdata(dev);             \
                                                                         \
         minutes = 0;                                                    \
         /* must at least convert degrees */                             \
-        if (sscanf (buf, "%d.%d", &degrees, &minutes) < 1) {            \
+        if (sscanf(buf, "%d.%d", &degrees, &minutes) < 1) {             \
                 return -EINVAL;                                         \
         }                                                               \
                                                                         \
@@ -220,21 +218,22 @@ static ssize_t set_servo##value (struct device *dev, struct device_attribute *at
                 return -EINVAL;                                         \
                                                                         \
         if (servo->type & SERVO_VERSION_30)                             \
-                retval = change_position_v30 (servo, value, degrees,    \
+                retval = change_position_v30(servo, value, degrees,     \
                                                         minutes);       \
         else                                                            \
-                retval = change_position_v20 (servo, value, degrees,    \
+                retval = change_position_v20(servo, value, degrees,     \
                                                         minutes);       \
                                                                         \
         return retval < 0 ? retval : count;                             \
 }                                                                       \
                                                                         \
-static ssize_t show_servo##value (struct device *dev, struct device_attribute *attr, char *buf)         \
+static ssize_t show_servo##value (struct device *dev,                   \
+                                        struct device_attribute *attr,  \
+                                        char *buf)                      \
 {                                                                       \
-        struct usb_interface *intf = to_usb_interface (dev);            \
-        struct phidget_servo *servo = usb_get_intfdata (intf);          \
+        struct phidget_servo *servo = dev_get_drvdata(dev);             \
                                                                         \
-        return sprintf (buf, "%d.%02d\n", servo->degrees[value],        \
+        return sprintf(buf, "%d.%02d\n", servo->degrees[value],         \
                                 servo->minutes[value]);                 \
 }                                                                       \
 static DEVICE_ATTR(servo##value, S_IWUGO | S_IRUGO,                     \
@@ -250,6 +249,7 @@ servo_probe(struct usb_interface *interface, const struct usb_device_id *id)
 {
         struct usb_device *udev = interface_to_usbdev(interface);
         struct phidget_servo *dev;
+        int bit, value;
 
         dev = kzalloc(sizeof (struct phidget_servo), GFP_KERNEL);
         if (dev == NULL) {
@@ -261,18 +261,33 @@ servo_probe(struct usb_interface *interface, const struct usb_device_id *id)
         dev->type = id->driver_info;
         usb_set_intfdata(interface, dev);
 
-        device_create_file(&interface->dev, &dev_attr_servo0);
+        do {
+                bit = find_first_zero_bit(&device_no, sizeof(device_no));
+                value = test_and_set_bit(bit, &device_no);
+        } while(value);
+        dev->dev_no = bit;
+
+        dev->dev = device_create(phidget_class, &dev->udev->dev, 0,
+                                 "servo%d", dev->dev_no);
+        if (IS_ERR(dev->dev)) {
+                int rc = PTR_ERR(dev->dev);
+                clear_bit(dev->dev_no, &device_no);
+                kfree(dev);
+                return rc;
+        }
+
+        device_create_file(dev->dev, &dev_attr_servo0);
         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);
+                device_create_file(dev->dev, &dev_attr_servo1);
+                device_create_file(dev->dev, &dev_attr_servo2);
+                device_create_file(dev->dev, &dev_attr_servo3);
         }
 
         dev_info(&interface->dev, "USB %d-Motor PhidgetServo v%d.0 attached\n",
                 dev->type & SERVO_COUNT_QUAD ? 4 : 1,
                 dev->type & SERVO_VERSION_30 ? 3 : 2);
 
-        if(!(dev->type & SERVO_VERSION_30))
+        if (!(dev->type & SERVO_VERSION_30))
                 dev_info(&interface->dev,
                          "WARNING: v2.0 not tested! Please report if it works.\n");
 
@@ -287,19 +302,21 @@ servo_disconnect(struct usb_interface *interface)
         dev = usb_get_intfdata(interface);
         usb_set_intfdata(interface, NULL);
 
-        device_remove_file(&interface->dev, &dev_attr_servo0);
+        device_remove_file(dev->dev, &dev_attr_servo0);
         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);
+                device_remove_file(dev->dev, &dev_attr_servo1);
+                device_remove_file(dev->dev, &dev_attr_servo2);
+                device_remove_file(dev->dev, &dev_attr_servo3);
         }
 
+        device_unregister(dev->dev);
         usb_put_dev(dev->udev);
 
         dev_info(&interface->dev, "USB %d-Motor PhidgetServo v%d.0 detached\n",
                 dev->type & SERVO_COUNT_QUAD ? 4 : 1,
                 dev->type & SERVO_VERSION_30 ? 3 : 2);
 
+        clear_bit(dev->dev_no, &device_no);
         kfree(dev);
 }