[PATCH] USB: usb-storage: Add support for Rio Karma

This patch from Bob Copeland adds support for the Rio Karma portable
digital audio player to the usb-storage driver.  The only thing needed to
support this device is a one-time (per plugin) init command which is sent
to the device.

Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 73 insertions, 0 deletions

diff --git a/drivers/usb/storage/initializers.c b/drivers/usb/storage/initializers.c
index 5b06f9240d05..ab173b30076e 100644
--- a/drivers/usb/storage/initializers.c
+++ b/drivers/usb/storage/initializers.c
@@ -45,6 +45,12 @@
 #include "debug.h"
 #include "transport.h"
 
+#define RIO_MSC 0x08
+#define RIOP_INIT "RIOP\x00\x01\x08"
+#define RIOP_INIT_LEN 7
+#define RIO_SEND_LEN 40
+#define RIO_RECV_LEN 0x200
+
 /* This places the Shuttle/SCM USB<->SCSI bridge devices in multi-target
  * mode */
 int usb_stor_euscsi_init(struct us_data *us)
@@ -91,3 +97,70 @@ int usb_stor_ucr61s2b_init(struct us_data *us)
 
         return (res ? -1 : 0);
 }
+
+/* Place the Rio Karma into mass storage mode.
+ *
+ * The initialization begins by sending 40 bytes starting
+ * RIOP\x00\x01\x08\x00, which the device will ack with a 512-byte
+ * packet with the high four bits set and everything else null.
+ *
+ * Next, we send RIOP\x80\x00\x08\x00.  Each time, a 512 byte response
+ * must be read, but we must loop until byte 5 in the response is 0x08,
+ * indicating success.  */
+int rio_karma_init(struct us_data *us)
+{
+        int result, partial;
+        char *recv;
+        unsigned long timeout;
+
+        // us->iobuf is big enough to hold cmd but not receive
+        if (!(recv = kmalloc(RIO_RECV_LEN, GFP_KERNEL)))
+                goto die_nomem;
+
+        US_DEBUGP("Initializing Karma...\n");
+
+        memset(us->iobuf, 0, RIO_SEND_LEN);
+        memcpy(us->iobuf, RIOP_INIT, RIOP_INIT_LEN);
+
+        result = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,
+                us->iobuf, RIO_SEND_LEN, &partial);
+        if (result != USB_STOR_XFER_GOOD)
+                goto die;
+
+        result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
+                recv, RIO_RECV_LEN, &partial);
+        if (result != USB_STOR_XFER_GOOD)
+                goto die;
+
+        us->iobuf[4] = 0x80;
+        us->iobuf[5] = 0;
+        timeout = jiffies + msecs_to_jiffies(3000);
+        for (;;) {
+                US_DEBUGP("Sending init command\n");
+                result = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,
+                        us->iobuf, RIO_SEND_LEN, &partial);
+                if (result != USB_STOR_XFER_GOOD)
+                        goto die;
+
+                result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
+                        recv, RIO_RECV_LEN, &partial);
+                if (result != USB_STOR_XFER_GOOD)
+                        goto die;
+
+                if (recv[5] == RIO_MSC)
+                        break;
+                if (time_after(jiffies, timeout))
+                        goto die;
+                msleep(10);
+        }
+        US_DEBUGP("Karma initialized.\n");
+        kfree(recv);
+        return 0;
+
+die:
+        kfree(recv);
+die_nomem:
+        US_DEBUGP("Could not initialize karma.\n");
+        return USB_STOR_TRANSPORT_FAILED;
+}
+