altos/stm: Handle USB reset in STM32L usb driver

Just like lpc and stmf0, deal with the host resetting the bus while
rebooting by restoring all usb-related data to the initial values.

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/src/stm/ao_usb_stm.c b/src/stm/ao_usb_stm.c
index 4e9d1f145cd98001e4378d3f8ea12050fc034e91..3d26466b4deee8c607d440a61e372f9e09139a5b 100644 (file)
--- a/src/stm/ao_usb_stm.c
+++ b/src/stm/ao_usb_stm.c
@@ -349,6 +349,19 @@ ao_usb_set_ep0(void)
        }
 
        ao_usb_set_address(0);
+
+       ao_usb_running = 0;
+
+       /* Reset our internal state
+        */
+
+       ao_usb_ep0_state = AO_USB_EP0_IDLE;
+
+       ao_usb_ep0_in_data = NULL;
+       ao_usb_ep0_in_len = 0;
+
+       ao_usb_ep0_out_data = 0;
+       ao_usb_ep0_out_len = 0;
 }
 
 static void
@@ -393,7 +406,15 @@ ao_usb_set_configuration(void)
                       STM_USB_EPR_STAT_RX_DISABLED,
                       STM_USB_EPR_STAT_TX_NAK);
 
+       ao_usb_in_flushed = 0;
+       ao_usb_in_pending = 0;
+       ao_wakeup(&ao_usb_in_pending);
+
+       ao_usb_out_avail = 0;
+       ao_usb_configuration = 0;
+
        ao_usb_running = 1;
+       ao_wakeup(&ao_usb_running);
 }
 
 static uint16_t        control_count;
@@ -581,7 +602,7 @@ static struct ao_usb_line_coding ao_usb_line_coding = {115200, 0, 0, 8};
 /* Walk through the list of descriptors and find a match
  */
 static void
-ao_usb_get_descriptor(uint16_t value)
+ao_usb_get_descriptor(uint16_t value, uint16_t length)
 {
        const uint8_t           *descriptor;
        uint8_t         type = value >> 8;
@@ -595,6 +616,8 @@ ao_usb_get_descriptor(uint16_t value)
                                len = descriptor[2];
                        else
                                len = descriptor[0];
+                       if (len > length)
+                               len = length;
                        ao_usb_ep0_in_set(descriptor, len);
                        break;
                }
@@ -639,7 +662,7 @@ ao_usb_ep0_setup(void)
                                break;
                        case AO_USB_REQ_GET_DESCRIPTOR:
                                debug ("get descriptor %d\n", ao_usb_setup.value);
-                               ao_usb_get_descriptor(ao_usb_setup.value);
+                               ao_usb_get_descriptor(ao_usb_setup.value, ao_usb_setup.length);
                                break;
                        case AO_USB_REQ_GET_CONFIGURATION:
                                debug ("get configuration %d\n", ao_usb_configuration);