i2c: i2c-diolan-u2c: different usb endpoints for DLN-2-U2C

The previous diolan adapter uses other out/in endpoints than
the current DLN-2-U2C in compatibility mode.
They changed from 0x2/0x84 to 0x3/0x83.
This patch gets the endpoints from the usb interface, instead
of hardcode them in the driver.

This was tested on a current DLN-2-U2C board.

Signed-off-by: Martin Vogt <mvogt1@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/drivers/i2c/busses/i2c-diolan-u2c.c b/drivers/i2c/busses/i2c-diolan-u2c.c
index dae3ddfe7619cf69899d974992ea0e7b43264b59..721f7ebf9a3bcb034867dd8acfbb33236bf21e46 100644 (file)
--- a/drivers/i2c/busses/i2c-diolan-u2c.c
+++ b/drivers/i2c/busses/i2c-diolan-u2c.c
@@ -25,8 +25,6 @@
 #define USB_VENDOR_ID_DIOLAN           0x0abf
 #define USB_DEVICE_ID_DIOLAN_U2C       0x3370
 
-#define DIOLAN_OUT_EP          0x02
-#define DIOLAN_IN_EP           0x84
 
 /* commands via USB, must match command ids in the firmware */
 #define CMD_I2C_READ           0x01
@@ -84,6 +82,7 @@
 struct i2c_diolan_u2c {
        u8 obuffer[DIOLAN_OUTBUF_LEN];  /* output buffer */
        u8 ibuffer[DIOLAN_INBUF_LEN];   /* input buffer */
+       int ep_in, ep_out;              /* Endpoints    */
        struct usb_device *usb_dev;     /* the usb device for this device */
        struct usb_interface *interface;/* the interface for this device */
        struct i2c_adapter adapter;     /* i2c related things */
@@ -109,7 +108,7 @@ static int diolan_usb_transfer(struct i2c_diolan_u2c *dev)
                return -EINVAL;
 
        ret = usb_bulk_msg(dev->usb_dev,
-                          usb_sndbulkpipe(dev->usb_dev, DIOLAN_OUT_EP),
+                          usb_sndbulkpipe(dev->usb_dev, dev->ep_out),
                           dev->obuffer, dev->olen, &actual,
                           DIOLAN_USB_TIMEOUT);
        if (!ret) {
@@ -118,7 +117,7 @@ static int diolan_usb_transfer(struct i2c_diolan_u2c *dev)
 
                        tmpret = usb_bulk_msg(dev->usb_dev,
                                              usb_rcvbulkpipe(dev->usb_dev,
-                                                             DIOLAN_IN_EP),
+                                                             dev->ep_in),
                                              dev->ibuffer,
                                              sizeof(dev->ibuffer), &actual,
                                              DIOLAN_USB_TIMEOUT);
@@ -210,7 +209,7 @@ static void diolan_flush_input(struct i2c_diolan_u2c *dev)
                int ret;
 
                ret = usb_bulk_msg(dev->usb_dev,
-                                  usb_rcvbulkpipe(dev->usb_dev, DIOLAN_IN_EP),
+                                  usb_rcvbulkpipe(dev->usb_dev, dev->ep_in),
                                   dev->ibuffer, sizeof(dev->ibuffer), &actual,
                                   DIOLAN_USB_TIMEOUT);
                if (ret < 0 || actual == 0)
@@ -445,9 +444,14 @@ static void diolan_u2c_free(struct i2c_diolan_u2c *dev)
 static int diolan_u2c_probe(struct usb_interface *interface,
                            const struct usb_device_id *id)
 {
+       struct usb_host_interface *hostif = interface->cur_altsetting;
        struct i2c_diolan_u2c *dev;
        int ret;
 
+       if (hostif->desc.bInterfaceNumber != 0
+           || hostif->desc.bNumEndpoints < 2)
+               return -ENODEV;
+
        /* allocate memory for our device state and initialize it */
        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
        if (dev == NULL) {
@@ -455,6 +459,8 @@ static int diolan_u2c_probe(struct usb_interface *interface,
                ret = -ENOMEM;
                goto error;
        }
+       dev->ep_out = hostif->endpoint[0].desc.bEndpointAddress;
+       dev->ep_in = hostif->endpoint[1].desc.bEndpointAddress;
 
        dev->usb_dev = usb_get_dev(interface_to_usbdev(interface));
        dev->interface = interface;