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1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 | /* * LPCUSB, an USB device driver for LPC microcontrollers * Copyright (C) 2006 Bertrik Sikken (bertrik@sikken.nl) * Copyright (c) 2016 Intel Corporation * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /** * @file * @brief USB device core layer * * This module handles control transfer handler, standard request handler and * USB Interface for customer application. * * Control transfers handler is normally installed on the * endpoint 0 callback. * * Control transfers can be of the following type: * 0 Standard; * 1 Class; * 2 Vendor; * 3 Reserved. * * A callback can be installed for each of these control transfers using * usb_register_request_handler. * When an OUT request arrives, data is collected in the data store provided * with the usb_register_request_handler call. When the transfer is done, the * callback is called. * When an IN request arrives, the callback is called immediately to either * put the control transfer data in the data store, or to get a pointer to * control transfer data. The data is then packetized and sent to the host. * * Standard request handler handles the 'chapter 9' processing, specifically * the standard device requests in table 9-3 from the universal serial bus * specification revision 2.0 */ #include <errno.h> #include <stddef.h> #include <sys/util.h> #include <sys/__assert.h> #include <init.h> #include <drivers/gpio.h> #include <sys/byteorder.h> #include <usb/usb_device.h> #include <usb/usbstruct.h> #include <usb/usb_common.h> #include <usb_descriptor.h> #define LOG_LEVEL CONFIG_USB_DEVICE_LOG_LEVEL #include <logging/log.h> LOG_MODULE_REGISTER(usb_device); #include <usb/bos.h> #include <os_desc.h> #include "usb_transfer.h" #define MAX_DESC_HANDLERS 4 /** Device, interface, endpoint, other */ /* general descriptor field offsets */ #define DESC_bLength 0 /** Length offset */ #define DESC_bDescriptorType 1 /** Descriptor type offset */ /* config descriptor field offsets */ #define CONF_DESC_wTotalLength 2 /** Total length offset */ #define CONF_DESC_bConfigurationValue 5 /** Configuration value offset */ #define CONF_DESC_bmAttributes 7 /** configuration characteristics */ /* interface descriptor field offsets */ #define INTF_DESC_bInterfaceNumber 2 /** Interface number offset */ #define INTF_DESC_bAlternateSetting 3 /** Alternate setting offset */ /* endpoint descriptor field offsets */ #define ENDP_DESC_bEndpointAddress 2 /** Endpoint address offset */ #define ENDP_DESC_bmAttributes 3 /** Bulk or interrupt? */ #define ENDP_DESC_wMaxPacketSize 4 /** Maximum packet size offset */ #define MAX_NUM_REQ_HANDLERS 4 #define MAX_STD_REQ_MSG_SIZE 8 /* Default USB control EP, always 0 and 0x80 */ #define USB_CONTROL_OUT_EP0 0 #define USB_CONTROL_IN_EP0 0x80 /* Linker-defined symbols bound the USB descriptor structs */ extern struct usb_cfg_data __usb_data_start[]; extern struct usb_cfg_data __usb_data_end[]; K_MUTEX_DEFINE(usb_enable_lock); static struct usb_dev_priv { /** Setup packet */ struct usb_setup_packet setup; /** Pointer to data buffer */ uint8_t *data_buf; /** Remaining bytes in buffer */ int32_t data_buf_residue; /** Total length of control transfer */ int32_t data_buf_len; /** Zero length packet flag of control transfer */ bool zlp_flag; /** Installed custom request handler */ usb_request_handler custom_req_handler; /** USB stack status callback */ usb_dc_status_callback status_callback; /** USB user status callback */ usb_dc_status_callback user_status_callback; /** Pointer to registered descriptors */ const uint8_t *descriptors; /** Array of installed request handler callbacks */ usb_request_handler req_handlers[MAX_NUM_REQ_HANDLERS]; /* Buffer used for storing standard, class and vendor request data */ uint8_t req_data[CONFIG_USB_REQUEST_BUFFER_SIZE]; /** Variable to check whether the usb has been enabled */ bool enabled; /** Variable to check whether the usb has been configured */ bool configured; /** Currently selected configuration */ uint8_t configuration; /** Remote wakeup feature status */ bool remote_wakeup; } usb_dev; /* Setup packet definition used to read raw data from USB line */ struct usb_setup_packet_packed { uint8_t bmRequestType; uint8_t bRequest; uint16_t wValue; uint16_t wIndex; uint16_t wLength; } __packed; /* * @brief print the contents of a setup packet * * @param [in] setup The setup packet * */ static void usb_print_setup(struct usb_setup_packet *setup) { /* avoid compiler warning if LOG_DBG is not defined */ ARG_UNUSED(setup); LOG_DBG("Setup: " "bmRT 0x%02x, bR 0x%02x, wV 0x%04x, wI 0x%04x, wL 0x%04x", setup->bmRequestType, setup->bRequest, setup->wValue, setup->wIndex, setup->wLength); } /* * @brief handle a request by calling one of the installed request handlers * * Local function to handle a request by calling one of the installed request * handlers. In case of data going from host to device, the data is at *ppbData. * In case of data going from device to host, the handler can either choose to * write its data at *ppbData or update the data pointer. * * @param [in] setup The setup packet * @param [in,out] len Pointer to data length * @param [in,out] data Data buffer * * @return true if the request was handles successfully */ static bool usb_handle_request(struct usb_setup_packet *setup, int32_t *len, uint8_t **data) { uint32_t type = REQTYPE_GET_TYPE(setup->bmRequestType); usb_request_handler handler = usb_dev.req_handlers[type]; if (type >= MAX_NUM_REQ_HANDLERS) { LOG_DBG("Error Incorrect iType %d", type); return false; } if (handler == NULL) { LOG_DBG("No handler for reqtype %d", type); return false; } if ((*handler)(setup, len, data) < 0) { LOG_DBG("Handler Error %d", type); usb_print_setup(setup); return false; } return true; } /* * @brief send next chunk of data (possibly 0 bytes) to host * * @return N/A */ static void usb_data_to_host(uint16_t len) { if (usb_dev.zlp_flag == false) { uint32_t chunk = usb_dev.data_buf_residue; /*Always EP0 for control*/ usb_write(USB_CONTROL_IN_EP0, usb_dev.data_buf, usb_dev.data_buf_residue, &chunk); usb_dev.data_buf += chunk; usb_dev.data_buf_residue -= chunk; #ifndef CONFIG_USB_DEVICE_DISABLE_ZLP_EPIN_HANDLING /* * Set ZLP flag when host asks for a bigger length and the * last chunk is wMaxPacketSize long, to indicate the last * packet. */ if (!usb_dev.data_buf_residue && len > usb_dev.data_buf_len) { /* Send less data as requested during the Setup stage */ if (!(usb_dev.data_buf_len % USB_MAX_CTRL_MPS)) { /* Transfers a zero-length packet */ LOG_DBG("ZLP, requested %u , length %u ", len, usb_dev.data_buf_len); usb_dev.zlp_flag = true; } } #endif } else { usb_dev.zlp_flag = false; usb_dc_ep_write(USB_CONTROL_IN_EP0, NULL, 0, NULL); } } /* * @brief handle IN/OUT transfers on EP0 * * @param [in] ep Endpoint address * @param [in] ep_status Endpoint status * * @return N/A */ static void usb_handle_control_transfer(uint8_t ep, enum usb_dc_ep_cb_status_code ep_status) { uint32_t chunk = 0U; struct usb_setup_packet *setup = &usb_dev.setup; struct usb_setup_packet_packed setup_raw; LOG_DBG("ep 0x%02x, status 0x%02x", ep, ep_status); if (ep == USB_CONTROL_OUT_EP0 && ep_status == USB_DC_EP_SETUP) { /* * OUT transfer, Setup packet, * reset request message state machine */ if (usb_dc_ep_read(ep, (uint8_t *)&setup_raw, sizeof(setup_raw), NULL) < 0) { LOG_DBG("Read Setup Packet failed"); usb_dc_ep_set_stall(USB_CONTROL_IN_EP0); return; } /* Take care of endianness */ setup->bmRequestType = setup_raw.bmRequestType; setup->bRequest = setup_raw.bRequest; setup->wValue = sys_le16_to_cpu(setup_raw.wValue); setup->wIndex = sys_le16_to_cpu(setup_raw.wIndex); setup->wLength = sys_le16_to_cpu(setup_raw.wLength); if (setup->wLength > CONFIG_USB_REQUEST_BUFFER_SIZE) { if (REQTYPE_GET_DIR(setup->bmRequestType) != REQTYPE_DIR_TO_HOST) { LOG_ERR("Request buffer too small"); usb_dc_ep_set_stall(USB_CONTROL_IN_EP0); usb_dc_ep_set_stall(USB_CONTROL_OUT_EP0); return; } } usb_dev.data_buf = usb_dev.req_data; usb_dev.data_buf_residue = setup->wLength; usb_dev.data_buf_len = setup->wLength; usb_dev.zlp_flag = false; if (setup->wLength && REQTYPE_GET_DIR(setup->bmRequestType) == REQTYPE_DIR_TO_DEVICE) { return; } /* Ask installed handler to process request */ if (!usb_handle_request(setup, &usb_dev.data_buf_len, &usb_dev.data_buf)) { LOG_DBG("usb_handle_request failed"); usb_dc_ep_set_stall(USB_CONTROL_IN_EP0); return; } /* Send smallest of requested and offered length */ usb_dev.data_buf_residue = MIN(usb_dev.data_buf_len, setup->wLength); /* Send first part (possibly a zero-length status message) */ usb_data_to_host(setup->wLength); } else if (ep == USB_CONTROL_OUT_EP0) { /* OUT transfer, data or status packets */ if (usb_dev.data_buf_residue <= 0) { /* absorb zero-length status message */ if (usb_dc_ep_read(USB_CONTROL_OUT_EP0, usb_dev.data_buf, 0, &chunk) < 0) { LOG_DBG("Read DATA Packet failed"); usb_dc_ep_set_stall(USB_CONTROL_IN_EP0); } return; } if (usb_dc_ep_read(USB_CONTROL_OUT_EP0, usb_dev.data_buf, usb_dev.data_buf_residue, &chunk) < 0) { LOG_DBG("Read DATA Packet failed"); usb_dc_ep_set_stall(USB_CONTROL_IN_EP0); usb_dc_ep_set_stall(USB_CONTROL_OUT_EP0); return; } usb_dev.data_buf += chunk; usb_dev.data_buf_residue -= chunk; if (usb_dev.data_buf_residue == 0) { /* Received all, send data to handler */ usb_dev.data_buf = usb_dev.req_data; if (!usb_handle_request(setup, &usb_dev.data_buf_len, &usb_dev.data_buf)) { LOG_DBG("usb_handle_request1 failed"); usb_dc_ep_set_stall(USB_CONTROL_IN_EP0); return; } /*Send status to host*/ LOG_DBG(">> usb_data_to_host(2)"); usb_data_to_host(setup->wLength); } } else if (ep == USB_CONTROL_IN_EP0) { /* Send more data if available */ if (usb_dev.data_buf_residue != 0 || usb_dev.zlp_flag == true) { usb_data_to_host(setup->wLength); } } else { __ASSERT_NO_MSG(false); } } /* * @brief register a callback for handling requests * * @param [in] type Type of request, e.g. REQTYPE_TYPE_STANDARD * @param [in] handler Callback function pointer * * @return N/A */ static void usb_register_request_handler(int32_t type, usb_request_handler handler) { usb_dev.req_handlers[type] = handler; } /* * @brief register a pointer to a descriptor block * * This function registers a pointer to a descriptor block containing all * descriptors for the device. * * @param [in] usb_descriptors The descriptor byte array */ static void usb_register_descriptors(const uint8_t *usb_descriptors) { usb_dev.descriptors = usb_descriptors; } /* * @brief get specified USB descriptor * * This function parses the list of installed USB descriptors and attempts * to find the specified USB descriptor. * * @param [in] type_index Type and index of the descriptor * @param [in] lang_id Language ID of the descriptor (currently unused) * @param [out] len Descriptor length * @param [out] data Descriptor data * * @return true if the descriptor was found, false otherwise */ static bool usb_get_descriptor(uint16_t type_index, uint16_t lang_id, int32_t *len, uint8_t **data) { uint8_t type = 0U; uint8_t index = 0U; uint8_t *p = NULL; int32_t cur_index = 0; bool found = false; /*Avoid compiler warning until this is used for something*/ ARG_UNUSED(lang_id); type = GET_DESC_TYPE(type_index); index = GET_DESC_INDEX(type_index); /* * Invalid types of descriptors, * see USB Spec. Revision 2.0, 9.4.3 Get Descriptor */ if ((type == USB_INTERFACE_DESC) || (type == USB_ENDPOINT_DESC) || (type > USB_OTHER_SPEED)) { return false; } p = (uint8_t *)usb_dev.descriptors; cur_index = 0; while (p[DESC_bLength] != 0U) { if (p[DESC_bDescriptorType] == type) { if (cur_index == index) { found = true; break; } cur_index++; } /* skip to next descriptor */ p += p[DESC_bLength]; } if (found) { /* set data pointer */ *data = p; /* get length from structure */ if (type == USB_CONFIGURATION_DESC) { /* configuration descriptor is an * exception, length is at offset * 2 and 3 */ *len = (p[CONF_DESC_wTotalLength]) | (p[CONF_DESC_wTotalLength + 1] << 8); } else { /* normally length is at offset 0 */ *len = p[DESC_bLength]; } } else { /* nothing found */ LOG_DBG("Desc %x not found!", type_index); } return found; } /* * @brief configure and enable endpoint * * This function sets endpoint configuration according to one specified in USB * endpoint descriptor and then enables it for data transfers. * * @param [in] ep_desc Endpoint descriptor byte array * * @return true if successfully configured and enabled */ static bool set_endpoint(const struct usb_ep_descriptor *ep_desc) { struct usb_dc_ep_cfg_data ep_cfg; int ret; ep_cfg.ep_addr = ep_desc->bEndpointAddress; ep_cfg.ep_mps = sys_le16_to_cpu(ep_desc->wMaxPacketSize); ep_cfg.ep_type = ep_desc->bmAttributes & USB_EP_TRANSFER_TYPE_MASK; LOG_DBG("Set endpoint 0x%x type %u MPS %u", ep_cfg.ep_addr, ep_cfg.ep_type, ep_cfg.ep_mps); ret = usb_dc_ep_configure(&ep_cfg); if (ret == -EALREADY) { LOG_WRN("Endpoint 0x%02x already configured", ep_cfg.ep_addr); } else if (ret) { LOG_ERR("Failed to configure endpoint 0x%02x", ep_cfg.ep_addr); return false; } ret = usb_dc_ep_enable(ep_cfg.ep_addr); if (ret == -EALREADY) { LOG_WRN("Endpoint 0x%02x already enabled", ep_cfg.ep_addr); } else if (ret) { LOG_ERR("Failed to enable endpoint 0x%02x", ep_cfg.ep_addr); return false; } usb_dev.configured = true; return true; } /* * @brief Disable endpoint for transferring data * * This function cancels transfers that are associated with endpoint and * disabled endpoint itself. * * @param [in] ep_desc Endpoint descriptor byte array * * @return true if successfully deconfigured and disabled */ static bool reset_endpoint(const struct usb_ep_descriptor *ep_desc) { struct usb_dc_ep_cfg_data ep_cfg; int ret; ep_cfg.ep_addr = ep_desc->bEndpointAddress; ep_cfg.ep_type = ep_desc->bmAttributes & USB_EP_TRANSFER_TYPE_MASK; LOG_DBG("Reset endpoint 0x%02x type %u", ep_cfg.ep_addr, ep_cfg.ep_type); usb_cancel_transfer(ep_cfg.ep_addr); ret = usb_dc_ep_disable(ep_cfg.ep_addr); if (ret == -EALREADY) { LOG_WRN("Endpoint 0x%02x already disabled", ep_cfg.ep_addr); } else if (ret) { LOG_ERR("Failed to disable endpoint 0x%02x", ep_cfg.ep_addr); return false; } return true; } static bool usb_eps_reconfigure(struct usb_ep_descriptor *ep_desc, uint8_t cur_alt_setting, uint8_t alt_setting) { bool ret; if (cur_alt_setting != alt_setting) { LOG_DBG("Disable endpoint 0x%02x", ep_desc->bEndpointAddress); ret = reset_endpoint(ep_desc); } else { LOG_DBG("Enable endpoint 0x%02x", ep_desc->bEndpointAddress); ret = set_endpoint(ep_desc); } return ret; } /* * @brief set USB configuration * * This function configures the device according to the specified configuration * index and alternate setting by parsing the installed USB descriptor list. * A configuration index of 0 unconfigures the device. * * @param [in] config_index Configuration index * @param [in] alt_setting Alternate setting number * * @return true if successfully configured false if error or unconfigured */ static bool usb_set_configuration(uint8_t config_index, uint8_t alt_setting) { uint8_t *p = (uint8_t *)usb_dev.descriptors; uint8_t cur_alt_setting = 0xFF; uint8_t cur_config = 0xFF; bool found = false; if (config_index == 0U) { /* TODO: unconfigure device */ LOG_DBG("Device not configured - invalid configuration"); return true; } /* configure endpoints for this configuration/altsetting */ while (p[DESC_bLength] != 0U) { switch (p[DESC_bDescriptorType]) { case USB_CONFIGURATION_DESC: /* remember current configuration index */ cur_config = p[CONF_DESC_bConfigurationValue]; if (cur_config == config_index) { found = true; } break; case USB_INTERFACE_DESC: /* remember current alternate setting */ cur_alt_setting = p[INTF_DESC_bAlternateSetting]; break; case USB_ENDPOINT_DESC: if ((cur_config != config_index) || (cur_alt_setting != alt_setting)) { break; } found = set_endpoint((struct usb_ep_descriptor *)p); break; default: break; } /* skip to next descriptor */ p += p[DESC_bLength]; } if (usb_dev.status_callback) { usb_dev.status_callback(USB_DC_CONFIGURED, &config_index); } return found; } /* * @brief set USB interface * * @param [in] iface Interface index * @param [in] alt_setting Alternate setting number * * @return true if successfully configured false if error or unconfigured */ static bool usb_set_interface(uint8_t iface, uint8_t alt_setting) { const uint8_t *p = usb_dev.descriptors; const uint8_t *if_desc = NULL; struct usb_ep_descriptor *ep; uint8_t cur_alt_setting = 0xFF; uint8_t cur_iface = 0xFF; bool ret = false; LOG_DBG("iface %u alt_setting %u", iface, alt_setting); while (p[DESC_bLength] != 0U) { switch (p[DESC_bDescriptorType]) { case USB_INTERFACE_DESC: /* remember current alternate setting */ cur_alt_setting = p[INTF_DESC_bAlternateSetting]; cur_iface = p[INTF_DESC_bInterfaceNumber]; if (cur_iface == iface && cur_alt_setting == alt_setting) { if_desc = (void *)p; } LOG_DBG("Current iface %u alt setting %u", cur_iface, cur_alt_setting); break; case USB_ENDPOINT_DESC: if (cur_iface == iface) { ep = (struct usb_ep_descriptor *)p; ret = usb_eps_reconfigure(ep, cur_alt_setting, alt_setting); } break; default: break; } /* skip to next descriptor */ p += p[DESC_bLength]; } if (usb_dev.status_callback) { usb_dev.status_callback(USB_DC_INTERFACE, if_desc); } return ret; } /** * @brief Check if the device is in Configured state * * @return true if Configured, false otherwise. */ static bool is_device_configured(void) { return (usb_dev.configuration != 0); } /* * @brief handle a standard device request * * @param [in] setup The setup packet * @param [in,out] len Pointer to data length * @param [in,out] data_buf Data buffer * * @return true if the request was handled successfully */ static bool usb_handle_std_device_req(struct usb_setup_packet *setup, int32_t *len, uint8_t **data_buf) { uint16_t value = setup->wValue; uint16_t index = setup->wIndex; bool ret = true; uint8_t *data = *data_buf; switch (setup->bRequest) { case REQ_GET_STATUS: LOG_DBG("REQ_GET_STATUS"); /* bit 0: self-powered */ /* bit 1: remote wakeup */ data[0] = 0U; data[1] = 0U; if (IS_ENABLED(CONFIG_USB_SELF_POWERED)) { data[0] |= DEVICE_STATUS_SELF_POWERED; } if (IS_ENABLED(CONFIG_USB_DEVICE_REMOTE_WAKEUP)) { data[0] |= (usb_dev.remote_wakeup ? DEVICE_STATUS_REMOTE_WAKEUP : 0); } *len = 2; break; case REQ_SET_ADDRESS: LOG_DBG("REQ_SET_ADDRESS, addr 0x%x", value); usb_dc_set_address(value); break; case REQ_GET_DESCRIPTOR: LOG_DBG("REQ_GET_DESCRIPTOR"); ret = usb_get_descriptor(value, index, len, data_buf); break; case REQ_GET_CONFIGURATION: LOG_DBG("REQ_GET_CONFIGURATION"); /* indicate if we are configured */ data[0] = usb_dev.configuration; *len = 1; break; case REQ_SET_CONFIGURATION: value &= 0xFF; LOG_DBG("REQ_SET_CONFIGURATION, conf 0x%x", value); if (!usb_set_configuration(value, 0)) { LOG_DBG("USB Set Configuration failed"); ret = false; } else { /* configuration successful, * update current configuration */ usb_dev.configuration = value; } break; case REQ_CLEAR_FEATURE: LOG_DBG("REQ_CLEAR_FEATURE"); ret = false; if (IS_ENABLED(CONFIG_USB_DEVICE_REMOTE_WAKEUP)) { if (value == FEA_REMOTE_WAKEUP) { usb_dev.remote_wakeup = false; ret = true; } } break; case REQ_SET_FEATURE: LOG_DBG("REQ_SET_FEATURE"); ret = false; if (IS_ENABLED(CONFIG_USB_DEVICE_REMOTE_WAKEUP)) { if (value == FEA_REMOTE_WAKEUP) { usb_dev.remote_wakeup = true; ret = true; } } if (value == FEA_TEST_MODE) { /* put TEST_MODE code here */ } break; case REQ_SET_DESCRIPTOR: LOG_DBG("Device req 0x%02x not implemented", setup->bRequest); ret = false; break; default: LOG_DBG("Illegal device req 0x%02x", setup->bRequest); ret = false; break; } return ret; } /** * @brief Check if the interface of given number is valid * * @param [in] interface Number of the addressed interface * * This function searches through descriptor and checks * is the Host has addressed valid interface. * * @return true if interface exists - valid */ static bool is_interface_valid(uint8_t interface) { const uint8_t *p = (uint8_t *)usb_dev.descriptors; const struct usb_cfg_descriptor *cfg_descr; /* Search through descriptor for matching interface */ while (p[DESC_bLength] != 0U) { if (p[DESC_bDescriptorType] == USB_CONFIGURATION_DESC) { cfg_descr = (const struct usb_cfg_descriptor *)p; if (interface < cfg_descr->bNumInterfaces) { return true; } } p += p[DESC_bLength]; } return false; } /* * @brief handle a standard interface request * * @param [in] setup The setup packet * @param [in,out] len Pointer to data length * @param [in] data_buf Data buffer * * @return true if the request was handled successfully */ static bool usb_handle_std_interface_req(struct usb_setup_packet *setup, int32_t *len, uint8_t **data_buf) { uint8_t *data = *data_buf; /** The device must be configured to accept standard interface * requests and the addressed Interface must be valid. */ if (!is_device_configured() || (!is_interface_valid((uint8_t)setup->wIndex))) { return false; } switch (setup->bRequest) { case REQ_GET_STATUS: /* no bits specified */ data[0] = 0U; data[1] = 0U; *len = 2; break; case REQ_CLEAR_FEATURE: case REQ_SET_FEATURE: /* not defined for interface */ return false; case REQ_GET_INTERFACE: /** This handler is called for classes that does not support * alternate Interfaces so always return 0. Classes that * support alternative interfaces handles GET_INTERFACE * in custom_handler. */ data[0] = 0U; *len = 1; break; case REQ_SET_INTERFACE: LOG_DBG("REQ_SET_INTERFACE"); usb_set_interface(setup->wIndex, setup->wValue); *len = 0; break; default: LOG_DBG("Illegal interface req 0x%02x", setup->bRequest); return false; } return true; } /** * @brief Check if the endpoint of given address is valid * * @param [in] ep Address of the Endpoint * * This function checks if the Endpoint of given address * is valid for the configured device. Valid Endpoint is * either Control Endpoint or one used by the device. * * @return true if endpoint exists - valid */ static bool is_ep_valid(uint8_t ep) { size_t size = (__usb_data_end - __usb_data_start); const struct usb_ep_cfg_data *ep_data; const struct usb_cfg_data *cfg; /* Check if its Endpoint 0 */ if (USB_EP_GET_IDX(ep) == 0) { return true; } for (size_t i = 0; i < size; i++) { cfg = &__usb_data_start[i]; ep_data = cfg->endpoint; for (uint8_t n = 0; n < cfg->num_endpoints; n++) { if (ep_data[n].ep_addr == ep) { return true; } } } return false; } /* * @brief handle a standard endpoint request * * @param [in] setup The setup packet * @param [in,out] len Pointer to data length * @param [in] data_buf Data buffer * * @return true if the request was handled successfully */ static bool usb_handle_std_endpoint_req(struct usb_setup_packet *setup, int32_t *len, uint8_t **data_buf) { uint8_t ep = (uint8_t)setup->wIndex; uint8_t *data = *data_buf; /* Check if request addresses valid Endpoint */ if (!is_ep_valid(ep)) { return false; } switch (setup->bRequest) { case REQ_GET_STATUS: /** This request is valid for Control Endpoints when * the device is not yet configured. For other * Endpoints the device must be configured. * Firstly check if addressed ep is Control Endpoint. * If no then the device must be in Configured state * to accept the request. */ if ((USB_EP_GET_IDX(ep) == 0) || is_device_configured()) { /* bit 0 - Endpoint halted or not */ usb_dc_ep_is_stalled(ep, &data[0]); data[1] = 0U; *len = 2; break; } return false; case REQ_CLEAR_FEATURE: if (setup->wValue == FEA_ENDPOINT_HALT) { /** This request is valid for Control Endpoints when * the device is not yet configured. For other * Endpoints the device must be configured. * Firstly check if addressed ep is Control Endpoint. * If no then the device must be in Configured state * to accept the request. */ if ((USB_EP_GET_IDX(ep) == 0) || is_device_configured()) { LOG_INF("... EP clear halt %x", ep); usb_dc_ep_clear_stall(ep); if (usb_dev.status_callback) { usb_dev.status_callback( USB_DC_CLEAR_HALT, &ep); } break; } } /* only ENDPOINT_HALT defined for endpoints */ return false; case REQ_SET_FEATURE: if (setup->wValue == FEA_ENDPOINT_HALT) { /** This request is valid for Control Endpoints when * the device is not yet configured. For other * Endpoints the device must be configured. * Firstly check if addressed ep is Control Endpoint. * If no then the device must be in Configured state * to accept the request. */ if ((USB_EP_GET_IDX(ep) == 0) || is_device_configured()) { /* set HALT by stalling */ LOG_INF("--- EP SET halt %x", ep); usb_dc_ep_set_stall(ep); if (usb_dev.status_callback) { usb_dev.status_callback( USB_DC_SET_HALT, &ep); } break; } } /* only ENDPOINT_HALT defined for endpoints */ return false; case REQ_SYNCH_FRAME: /* For Synch Frame request the device must be configured */ if (is_device_configured()) { /* Not supported, return false anyway */ LOG_DBG("EP req 0x%02x not implemented", setup->bRequest); } return false; default: LOG_DBG("Illegal EP req 0x%02x", setup->bRequest); return false; } return true; } /* * @brief default handler for standard ('chapter 9') requests * * If a custom request handler was installed, this handler is called first. * * @param [in] setup The setup packet * @param [in,out] len Pointer to data length * @param [in] data_buf Data buffer * * @return true if the request was handled successfully */ static int usb_handle_standard_request(struct usb_setup_packet *setup, int32_t *len, uint8_t **data_buf) { int rc = 0; if (!usb_handle_bos(setup, len, data_buf)) { return 0; } if (!usb_handle_os_desc(setup, len, data_buf)) { return 0; } /* try the custom request handler first */ if (usb_dev.custom_req_handler && !usb_dev.custom_req_handler(setup, len, data_buf)) { return 0; } switch (REQTYPE_GET_RECIP(setup->bmRequestType)) { case REQTYPE_RECIP_DEVICE: if (usb_handle_std_device_req(setup, len, data_buf) == false) { rc = -EINVAL; } break; case REQTYPE_RECIP_INTERFACE: if (usb_handle_std_interface_req(setup, len, data_buf) == false) { rc = -EINVAL; } break; case REQTYPE_RECIP_ENDPOINT: if (usb_handle_std_endpoint_req(setup, len, data_buf) == false) { rc = -EINVAL; } break; default: rc = -EINVAL; } return rc; } /* * @brief Registers a callback for custom device requests * * In usb_register_custom_req_handler, the custom request handler gets a first * chance at handling the request before it is handed over to the 'chapter 9' * request handler. * * This can be used for example in HID devices, where a REQ_GET_DESCRIPTOR * request is sent to an interface, which is not covered by the 'chapter 9' * specification. * * @param [in] handler Callback function pointer */ static void usb_register_custom_req_handler(usb_request_handler handler) { usb_dev.custom_req_handler = handler; } /* * @brief register a callback for device status * * This function registers a callback for device status. The registered callback * is used to report changes in the status of the device controller. * * @param [in] cb Callback function pointer */ static void usb_register_status_callback(usb_dc_status_callback cb) { usb_dev.status_callback = cb; } static int foreach_ep(int (* endpoint_callback)(const struct usb_ep_cfg_data *)) { size_t size = (__usb_data_end - __usb_data_start); for (size_t i = 0; i < size; i++) { struct usb_cfg_data *cfg = &__usb_data_start[i]; struct usb_ep_cfg_data *ep_data = cfg->endpoint; for (uint8_t n = 0; n < cfg->num_endpoints; n++) { int ret; ret = endpoint_callback(&ep_data[n]); if (ret < 0) { return ret; } } } return 0; } static int disable_interface_ep(const struct usb_ep_cfg_data *ep_data) { return usb_dc_ep_disable(ep_data->ep_addr); } static void forward_status_cb(enum usb_dc_status_code status, const uint8_t *param) { size_t size = (__usb_data_end - __usb_data_start); if (status == USB_DC_DISCONNECTED || status == USB_DC_SUSPEND) { if (usb_dev.configured) { usb_cancel_transfers(); if (status == USB_DC_DISCONNECTED) { foreach_ep(disable_interface_ep); usb_dev.configured = false; } } } for (size_t i = 0; i < size; i++) { struct usb_cfg_data *cfg = &__usb_data_start[i]; if (cfg->cb_usb_status) { cfg->cb_usb_status(cfg, status, param); } } if (usb_dev.user_status_callback) { usb_dev.user_status_callback(status, param); } } /** * @brief turn on/off USB VBUS voltage * * To utilize this in the devicetree the chosen node should have a * zephyr,usb-device property that points to the usb device controller node. * Additionally the usb device controller node should have a vbus-gpios * property that has the GPIO details. * * Something like: * * chosen { * zephyr,usb-device = &usbd; * }; * * usbd: usbd { * vbus-gpios = <&gpio1 5 GPIO_ACTIVE_HIGH>; * }; * * @param on Set to false to turn off and to true to turn on VBUS * * @return 0 on success, negative errno code on fail */ static int usb_vbus_set(bool on) { #define USB_DEV_NODE DT_CHOSEN(zephyr_usb_device) #if DT_NODE_HAS_STATUS(USB_DEV_NODE, okay) && \ DT_NODE_HAS_PROP(USB_DEV_NODE, vbus_gpios) int ret = 0; const struct device *gpio_dev; gpio_dev = device_get_binding(DT_LABEL(USB_DEV_NODE)); if (!gpio_dev) { LOG_DBG("USB requires GPIO. Cannot find %s!", DT_LABEL(USB_DEV_NODE)); return -ENODEV; } /* Enable USB IO */ ret = gpio_pin_configure(gpio_dev, DT_GPIO_PIN(USB_DEV_NODE, vbus_gpios), GPIO_OUTPUT | DT_GPIO_FLAGS(USB_DEV_NODE, vbus_gpios)); if (ret) { return ret; } ret = gpio_pin_set(gpio_dev, DT_GPIO_PIN(USB_DEV_NODE, vbus_gpios), on == true ? 1 : 0); if (ret) { return ret; } #endif return 0; } int usb_deconfig(void) { /* unregister descriptors */ usb_register_descriptors(NULL); /* unegister standard request handler */ usb_register_request_handler(REQTYPE_TYPE_STANDARD, NULL); /* unregister class request handlers for each interface*/ usb_register_request_handler(REQTYPE_TYPE_CLASS, NULL); /* unregister class request handlers for each interface*/ usb_register_custom_req_handler(NULL); /* unregister status callback */ usb_register_status_callback(NULL); /* unregister user status callback */ usb_dev.user_status_callback = NULL; /* Reset USB controller */ usb_dc_reset(); return 0; } int usb_disable(void) { int ret; if (usb_dev.enabled != true) { /*Already disabled*/ return 0; } ret = usb_dc_detach(); if (ret < 0) { return ret; } /* Disable VBUS if needed */ usb_vbus_set(false); usb_dev.enabled = false; return 0; } int usb_write(uint8_t ep, const uint8_t *data, uint32_t data_len, uint32_t *bytes_ret) { int tries = CONFIG_USB_NUMOF_EP_WRITE_RETRIES; int ret; do { ret = usb_dc_ep_write(ep, data, data_len, bytes_ret); if (ret == -EAGAIN) { LOG_WRN("Failed to write endpoint buffer 0x%02x", ep); k_yield(); } } while (ret == -EAGAIN && tries--); return ret; } int usb_read(uint8_t ep, uint8_t *data, uint32_t max_data_len, uint32_t *ret_bytes) { return usb_dc_ep_read(ep, data, max_data_len, ret_bytes); } int usb_ep_set_stall(uint8_t ep) { return usb_dc_ep_set_stall(ep); } int usb_ep_clear_stall(uint8_t ep) { return usb_dc_ep_clear_stall(ep); } int usb_ep_read_wait(uint8_t ep, uint8_t *data, uint32_t max_data_len, uint32_t *ret_bytes) { return usb_dc_ep_read_wait(ep, data, max_data_len, ret_bytes); } int usb_ep_read_continue(uint8_t ep) { return usb_dc_ep_read_continue(ep); } int usb_wakeup_request(void) { if (IS_ENABLED(CONFIG_USB_DEVICE_REMOTE_WAKEUP)) { if (usb_dev.remote_wakeup) { return usb_dc_wakeup_request(); } return -EACCES; } else { return -ENOTSUP; } } /* * The functions class_handler(), custom_handler() and vendor_handler() * go through the interfaces one after the other and compare the * bInterfaceNumber with the wIndex and and then call the appropriate * callback of the USB function. * Note, a USB function can have more than one interface and the * request does not have to be directed to the first interface (unlikely). * These functions can be simplified and moved to usb_handle_request() * when legacy initialization throgh the usb_set_config() and * usb_enable() is no longer needed. */ static int class_handler(struct usb_setup_packet *pSetup, int32_t *len, uint8_t **data) { size_t size = (__usb_data_end - __usb_data_start); const struct usb_if_descriptor *if_descr; struct usb_interface_cfg_data *iface; LOG_DBG("bRequest 0x%02x, wIndex 0x%04x", pSetup->bRequest, pSetup->wIndex); for (size_t i = 0; i < size; i++) { iface = &(__usb_data_start[i].interface); if_descr = __usb_data_start[i].interface_descriptor; /* * Wind forward until it is within the range * of the current descriptor. */ if ((uint8_t *)if_descr < usb_dev.descriptors) { continue; } if (iface->class_handler && if_descr->bInterfaceNumber == (pSetup->wIndex & 0xFF)) { return iface->class_handler(pSetup, len, data); } } return -ENOTSUP; } static int custom_handler(struct usb_setup_packet *pSetup, int32_t *len, uint8_t **data) { size_t size = (__usb_data_end - __usb_data_start); const struct usb_if_descriptor *if_descr; struct usb_interface_cfg_data *iface; LOG_DBG("bRequest 0x%02x, wIndex 0x%04x", pSetup->bRequest, pSetup->wIndex); for (size_t i = 0; i < size; i++) { iface = &(__usb_data_start[i].interface); if_descr = __usb_data_start[i].interface_descriptor; /* * Wind forward until it is within the range * of the current descriptor. */ if ((uint8_t *)if_descr < usb_dev.descriptors) { continue; } /* An exception for AUDIO_CLASS is temporary and shall not be * considered as valid solution for other classes. */ if (iface->custom_handler && (if_descr->bInterfaceNumber == (pSetup->wIndex & 0xFF) || if_descr->bInterfaceClass == AUDIO_CLASS)) { return iface->custom_handler(pSetup, len, data); } } return -ENOTSUP; } static int vendor_handler(struct usb_setup_packet *pSetup, int32_t *len, uint8_t **data) { size_t size = (__usb_data_end - __usb_data_start); struct usb_interface_cfg_data *iface; LOG_DBG("bRequest 0x%02x, wIndex 0x%04x", pSetup->bRequest, pSetup->wIndex); if (usb_os_desc_enabled()) { if (!usb_handle_os_desc_feature(pSetup, len, data)) { return 0; } } for (size_t i = 0; i < size; i++) { iface = &(__usb_data_start[i].interface); if (iface->vendor_handler) { if (!iface->vendor_handler(pSetup, len, data)) { return 0; } } } return -ENOTSUP; } static int composite_setup_ep_cb(void) { size_t size = (__usb_data_end - __usb_data_start); struct usb_ep_cfg_data *ep_data; for (size_t i = 0; i < size; i++) { ep_data = __usb_data_start[i].endpoint; for (uint8_t n = 0; n < __usb_data_start[i].num_endpoints; n++) { LOG_DBG("set cb, ep: 0x%x", ep_data[n].ep_addr); if (usb_dc_ep_set_callback(ep_data[n].ep_addr, ep_data[n].ep_cb)) { return -1; } } } return 0; } int usb_set_config(const uint8_t *device_descriptor) { /* register descriptors */ usb_register_descriptors(device_descriptor); /* register standard request handler */ usb_register_request_handler(REQTYPE_TYPE_STANDARD, usb_handle_standard_request); /* register class request handlers for each interface*/ usb_register_request_handler(REQTYPE_TYPE_CLASS, class_handler); /* register vendor request handler */ usb_register_request_handler(REQTYPE_TYPE_VENDOR, vendor_handler); /* register class request handlers for each interface*/ usb_register_custom_req_handler(custom_handler); return 0; } int usb_enable(usb_dc_status_callback status_cb) { int ret; struct usb_dc_ep_cfg_data ep0_cfg; /* Prevent from calling usb_enable form different contex. * This should only be called once. */ LOG_DBG("lock usb_enable_lock mutex"); k_mutex_lock(&usb_enable_lock, K_FOREVER); if (usb_dev.enabled == true) { ret = 0; goto out; } /* Enable VBUS if needed */ ret = usb_vbus_set(true); if (ret < 0) { goto out; } usb_dev.user_status_callback = status_cb; usb_register_status_callback(forward_status_cb); usb_dc_set_status_callback(forward_status_cb); ret = usb_dc_attach(); if (ret < 0) { goto out; } ret = usb_transfer_init(); if (ret < 0) { goto out; } /* Configure control EP */ ep0_cfg.ep_mps = USB_MAX_CTRL_MPS; ep0_cfg.ep_type = USB_DC_EP_CONTROL; ep0_cfg.ep_addr = USB_CONTROL_OUT_EP0; ret = usb_dc_ep_configure(&ep0_cfg); if (ret < 0) { goto out; } ep0_cfg.ep_addr = USB_CONTROL_IN_EP0; ret = usb_dc_ep_configure(&ep0_cfg); if (ret < 0) { goto out; } /* Register endpoint 0 handlers*/ ret = usb_dc_ep_set_callback(USB_CONTROL_OUT_EP0, usb_handle_control_transfer); if (ret < 0) { goto out; } ret = usb_dc_ep_set_callback(USB_CONTROL_IN_EP0, usb_handle_control_transfer); if (ret < 0) { goto out; } /* Register endpoint handlers*/ ret = composite_setup_ep_cb(); if (ret < 0) { goto out; } /* Enable control EP */ ret = usb_dc_ep_enable(USB_CONTROL_OUT_EP0); if (ret < 0) { goto out; } ret = usb_dc_ep_enable(USB_CONTROL_IN_EP0); if (ret < 0) { goto out; } usb_dev.enabled = true; ret = 0; out: LOG_DBG("unlock usb_enable_lock mutex"); k_mutex_unlock(&usb_enable_lock); return ret; } /* * This function configures the USB device stack based on USB descriptor and * usb_cfg_data. */ static int usb_device_init(const struct device *dev) { uint8_t *device_descriptor; if (usb_dev.enabled == true) { return 0; } /* register device descriptor */ device_descriptor = usb_get_device_descriptor(); if (!device_descriptor) { LOG_ERR("Failed to configure USB device stack"); return -1; } usb_set_config(device_descriptor); return 0; } SYS_INIT(usb_device_init, POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE); |