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/* Copyright 2016 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "atomic.h"
#include "clock.h"
#include "common.h"
#include "config.h"
#include "console.h"
#include "gpio.h"
#include "hooks.h"
#include "link_defs.h"
#include "registers.h"
#include "task.h"
#include "timer.h"
#include "util.h"
#include "usb_descriptor.h"
#include "usb_hid.h"
#include "usb_hid_keyboard.h"
#include "usb_hid_hw.h"
/* Console output macro */
#define CPRINTF(format, args...) cprintf(CC_USB, format, ## args)
#define HID_KEYBOARD_REPORT_SIZE 8
/* HID descriptors */
const struct usb_interface_descriptor USB_IFACE_DESC(USB_IFACE_HID_KEYBOARD) = {
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = USB_IFACE_HID_KEYBOARD,
.bAlternateSetting = 0,
.bNumEndpoints = 1,
.bInterfaceClass = USB_CLASS_HID,
.bInterfaceSubClass = USB_HID_SUBCLASS_BOOT,
.bInterfaceProtocol = USB_HID_PROTOCOL_KEYBOARD,
.iInterface = 0,
};
const struct usb_endpoint_descriptor USB_EP_DESC(USB_IFACE_HID_KEYBOARD, 81) = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = 0x80 | USB_EP_HID_KEYBOARD,
.bmAttributes = 0x03 /* Interrupt endpoint */,
.wMaxPacketSize = HID_KEYBOARD_REPORT_SIZE,
.bInterval = 40 /* ms polling interval */
};
/* HID : Report Descriptor */
static const uint8_t report_desc[] = {
0x05, 0x01, /* Usage Page (Generic Desktop) */
0x09, 0x06, /* Usage (Keyboard) */
0xA1, 0x01, /* Collection (Application) */
0x05, 0x07, /* Usage Page (Key Codes) */
0x19, 0xE0, /* Usage Minimum (224) */
0x29, 0xE7, /* Usage Maximum (231) */
0x15, 0x00, /* Logical Minimum (0) */
0x25, 0x01, /* Logical Maximum (1) */
0x75, 0x01, /* Report Size (1) */
0x95, 0x08, /* Report Count (8) */
0x81, 0x02, /* Input (Data, Variable, Absolute), ;Modifier byte */
0x95, 0x01, /* Report Count (1) */
0x75, 0x08, /* Report Size (8) */
0x81, 0x01, /* Input (Constant), ;Reserved byte */
0x95, 0x06, /* Report Count (6) */
0x75, 0x08, /* Report Size (8) */
0x15, 0x00, /* Logical Minimum (0) */
0x25, 0x65, /* Logical Maximum(101) */
0x05, 0x07, /* Usage Page (Key Codes) */
0x19, 0x00, /* Usage Minimum (0) */
0x29, 0x65, /* Usage Maximum (101) */
0x81, 0x00, /* Input (Data, Array), ;Key arrays (6 bytes) */
0xC0 /* End Collection */
};
const struct usb_hid_descriptor USB_CUSTOM_DESC(USB_IFACE_HID_KEYBOARD, hid) = {
.bLength = 9,
.bDescriptorType = USB_HID_DT_HID,
.bcdHID = 0x0100,
.bCountryCode = 0x00, /* Hardware target country */
.bNumDescriptors = 1,
.desc = {{
.bDescriptorType = USB_HID_DT_REPORT,
.wDescriptorLength = sizeof(report_desc)
}}
};
static usb_uint hid_ep_buf[2][HID_KEYBOARD_REPORT_SIZE / 2] __usb_ram;
static volatile int hid_current_buf;
static volatile int hid_ep_data_ready;
void set_keyboard_report(uint64_t rpt)
{
/* Prevent the interrupt handler from sending the data (which would use
* an incomplete buffer).
*/
hid_ep_data_ready = 0;
hid_current_buf = hid_current_buf ? 0 : 1;
memcpy_to_usbram((void *) usb_sram_addr(hid_ep_buf[hid_current_buf]),
&rpt, sizeof(rpt));
/* Tell the interrupt handler to send the next buffer. */
hid_ep_data_ready = 1;
if ((STM32_USB_EP(USB_EP_HID_KEYBOARD) & EP_TX_MASK) == EP_TX_VALID) {
/* Endpoint is busy: we sneak in an address change to give us a
* chance to send the most updated report. However, there is no
* guarantee that this buffer is the one actually sent, so we
* keep hid_ep_data_ready = 1, which will send a duplicated
* report.
*/
btable_ep[USB_EP_HID_KEYBOARD].tx_addr =
usb_sram_addr(hid_ep_buf[hid_current_buf]);
hid_ep_data_ready = 1;
} else if (atomic_read_clear(&hid_ep_data_ready)) {
/* Endpoint is not busy, and interrupt handler did not just
* send our last buffer: swap buffer, enable TX.
*/
btable_ep[USB_EP_HID_KEYBOARD].tx_addr =
usb_sram_addr(hid_ep_buf[hid_current_buf]);
STM32_TOGGLE_EP(USB_EP_HID_KEYBOARD, EP_TX_MASK,
EP_TX_VALID, 0);
}
}
static void hid_keyboard_tx(void)
{
hid_tx(USB_EP_HID_KEYBOARD);
if (hid_ep_data_ready) {
/* swap buffer, enable TX */
btable_ep[USB_EP_HID_KEYBOARD].tx_addr =
usb_sram_addr(hid_ep_buf[hid_current_buf]);
STM32_TOGGLE_EP(USB_EP_HID_KEYBOARD, EP_TX_MASK,
EP_TX_VALID, 0);
}
hid_ep_data_ready = 0;
}
static void hid_keyboard_reset(void)
{
hid_reset(USB_EP_HID_KEYBOARD, hid_ep_buf[hid_current_buf],
HID_KEYBOARD_REPORT_SIZE);
}
USB_DECLARE_EP(USB_EP_HID_KEYBOARD, hid_keyboard_tx, hid_keyboard_tx,
hid_keyboard_reset);
static int hid_keyboard_iface_request(usb_uint *ep0_buf_rx,
usb_uint *ep0_buf_tx)
{
return hid_iface_request(ep0_buf_rx, ep0_buf_tx,
report_desc, sizeof(report_desc));
}
USB_DECLARE_IFACE(USB_IFACE_HID_KEYBOARD, hid_keyboard_iface_request)
static int command_hid_kb(int argc, char **argv)
{
uint8_t keycode = 0x0a; /* 'G' key */
if (argc >= 2) {
char *e;
keycode = strtoi(argv[1], &e, 16);
if (*e)
return EC_ERROR_PARAM1;
}
/* press then release the key */
set_keyboard_report((uint32_t)keycode << 16);
udelay(50000);
set_keyboard_report(0x000000);
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(hid_kb, command_hid_kb,
"[<HID keycode>]",
"test USB HID driver");
static int command_hid_test(int argc, char **argv)
{
uint8_t keycode = 0x0a; /* 'G' key */
for (keycode = 0x0a; keycode < 0x3a; keycode++) {
/* Quickly change the report (faster than interrupt period) */
set_keyboard_report((uint32_t)keycode << 16);
udelay(1000);
}
udelay(50000);
set_keyboard_report(0x000000);
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(hid_test, command_hid_test,
"", "test USB HID driver");
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