157 lines
4.3 KiB
C
157 lines
4.3 KiB
C
/* Copyright 2014 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "clock.h"
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#include "common.h"
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#include "config.h"
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#include "console.h"
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#include "gpio.h"
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#include "hooks.h"
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#include "link_defs.h"
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#include "registers.h"
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#include "task.h"
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#include "timer.h"
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#include "util.h"
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#include "usb_descriptor.h"
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#include "usb_hw.h"
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#include "usb_hid.h"
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#include "usb_hid_hw.h"
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/* Console output macro */
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#define CPRINTF(format, args...) cprintf(CC_USB, format, ## args)
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void hid_tx(int ep)
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{
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/* clear IT */
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STM32_USB_EP(ep) = (STM32_USB_EP(ep) & EP_MASK);
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}
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void hid_reset(int ep, usb_uint *hid_ep_tx_buf, int tx_len,
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usb_uint *hid_ep_rx_buf, int rx_len)
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{
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int i;
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uint16_t ep_reg;
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btable_ep[ep].tx_addr = usb_sram_addr(hid_ep_tx_buf);
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btable_ep[ep].tx_count = tx_len;
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/* STM32 USB SRAM needs to be accessed one U16 at a time */
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for (i = 0; i < DIV_ROUND_UP(tx_len, 2); i++)
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hid_ep_tx_buf[i] = 0;
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ep_reg = (ep << 0) /* Endpoint Address */ |
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EP_TX_VALID |
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(3 << 9) /* interrupt EP */ |
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EP_RX_DISAB;
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/* Enable RX for output reports */
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if (hid_ep_rx_buf && rx_len > 0) {
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btable_ep[ep].rx_addr = usb_sram_addr(hid_ep_rx_buf);
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btable_ep[ep].rx_count = ((rx_len + 1) / 2) << 10;
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ep_reg |= EP_RX_VALID; /* RX Valid */
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}
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STM32_USB_EP(ep) = ep_reg;
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}
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/*
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* Keep track of state in case we need to be called multiple times,
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* if the report length is bigger than 64 bytes.
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*/
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static int report_left;
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static const uint8_t *report_ptr;
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/*
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* Send report through ep0_buf_tx.
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*
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* If report size is greater than USB packet size (64 bytes), rest of the
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* reports will be saved in `report_ptr` and `report_left`, so we can call this
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* function again to send the remain parts.
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*
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* @return 0 if entire report is sent, 1 if there are remaining data.
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*/
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static int send_report(usb_uint *ep0_buf_tx,
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const uint8_t *report,
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int report_size)
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{
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int packet_size = MIN(report_size, USB_MAX_PACKET_SIZE);
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memcpy_to_usbram((void *) usb_sram_addr(ep0_buf_tx),
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report, packet_size);
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btable_ep[0].tx_count = packet_size;
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/* report_left != 0 if report doesn't fit in 1 packet. */
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report_left = report_size - packet_size;
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report_ptr = report + packet_size;
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STM32_TOGGLE_EP(0, EP_TX_RX_MASK, EP_TX_RX_VALID,
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report_left ? 0 : EP_STATUS_OUT);
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return report_left ? 1 : 0;
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}
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int hid_iface_request(usb_uint *ep0_buf_rx, usb_uint *ep0_buf_tx,
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const struct usb_hid_config_t *config)
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{
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const uint8_t *report_desc = config->report_desc;
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int report_size = config->report_size;
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const struct usb_hid_descriptor *hid_desc = config->hid_desc;
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if (!ep0_buf_rx) {
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/*
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* Continue previous transfer. We ignore report_desc/size here,
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* which is fine as only one GET_DESCRIPTOR command comes at a
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* time.
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*/
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if (report_left == 0)
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return -1;
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report_size = MIN(USB_MAX_PACKET_SIZE, report_left);
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memcpy_to_usbram((void *) usb_sram_addr(ep0_buf_tx),
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report_ptr, report_size);
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btable_ep[0].tx_count = report_size;
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report_left -= report_size;
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report_ptr += report_size;
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STM32_TOGGLE_EP(0, EP_TX_MASK, EP_TX_VALID,
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report_left ? 0 : EP_STATUS_OUT);
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return report_left ? 1 : 0;
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} else if (ep0_buf_rx[0] == (USB_DIR_IN | USB_RECIP_INTERFACE |
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(USB_REQ_GET_DESCRIPTOR << 8))) {
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if (ep0_buf_rx[1] == (USB_HID_DT_REPORT << 8)) {
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/* Setup : HID specific : Get Report descriptor */
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return send_report(ep0_buf_tx, report_desc,
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MIN(ep0_buf_rx[3], report_size));
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} else if (ep0_buf_rx[1] == (USB_HID_DT_HID << 8)) {
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/* Setup : HID specific : Get HID descriptor */
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memcpy_to_usbram_ep0_patch(hid_desc, sizeof(*hid_desc));
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btable_ep[0].tx_count = sizeof(*hid_desc);
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STM32_TOGGLE_EP(0, EP_TX_RX_MASK, EP_TX_RX_VALID,
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EP_STATUS_OUT);
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return 0;
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}
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} else if (ep0_buf_rx[0] == (USB_DIR_IN |
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USB_RECIP_INTERFACE |
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USB_TYPE_CLASS |
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(USB_HID_REQ_GET_REPORT << 8))) {
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const uint8_t report_type = (ep0_buf_rx[1] >> 8) & 0xFF;
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const uint8_t report_id = ep0_buf_rx[1] & 0xFF;
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int retval;
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report_left = ep0_buf_rx[3];
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if (!config->get_report) /* not supported */
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return -1;
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retval = config->get_report(report_id,
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report_type,
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&report_ptr,
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&report_left);
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if (retval)
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return retval;
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return send_report(ep0_buf_tx, report_ptr, report_left);
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}
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return -1;
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}
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