diff options
Diffstat (limited to 'payloads/libpayload/drivers/usb')
| -rw-r--r-- | payloads/libpayload/drivers/usb/usbmsc.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/payloads/libpayload/drivers/usb/usbmsc.c b/payloads/libpayload/drivers/usb/usbmsc.c index ad7e82f3b0..ffb1c93916 100644 --- a/payloads/libpayload/drivers/usb/usbmsc.c +++ b/payloads/libpayload/drivers/usb/usbmsc.c @@ -123,6 +123,8 @@ enum { static int request_sense (usbdev_t *dev); +static int +request_sense_no_media (usbdev_t *dev); static int reset_transport (usbdev_t *dev) @@ -256,6 +258,11 @@ execute_command (usbdev_t *dev, cbw_direction dir, const u8 *cb, int cblen, if (cb[0] == 0x03) /* requesting sense failed, that's bad */ return MSC_COMMAND_FAIL; + else if (cb[0] == 0) + /* If command was TEST UNIT READY determine if the + * device is of removable type indicating no media + * found. */ + return request_sense_no_media (dev); /* error "check condition" or reserved error */ ret = request_sense (dev); /* return fail or the status of request_sense if it's worse */ @@ -350,6 +357,34 @@ request_sense (usbdev_t *dev) sizeof (cb), buf, 19, 1); } +static int request_sense_no_media(usbdev_t *dev) +{ + u8 buf[19]; + int ret; + cmdblock6_t cb; + memset (&cb, 0, sizeof (cb)); + cb.command = 0x3; + + ret = execute_command (dev, cbw_direction_data_in, (u8 *) &cb, + sizeof (cb), buf, 19, 1); + + if (ret) + return ret; + + /* Check if sense key is set to NOT READY. */ + if ((buf[2] & 0xf) != 2) + return MSC_COMMAND_FAIL; + + /* Check if additional sense code is 0x3a. */ + if (buf[12] != 0x3a) + return MSC_COMMAND_FAIL; + + /* No media is present. Return MSC_COMMAND_DETACHED so as not to use + * this device any longer. */ + usb_debug("Empty media found.\n"); + return MSC_COMMAND_DETACHED; +} + static int test_unit_ready (usbdev_t *dev) { |