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https://github.com/Telecominfraproject/OpenCellular.git
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d5c08763e1
The default USB packet has a maximum size of 64 bytes, however, we need to support some USB over I2C write transaction that exceed this default. To support so with protocol backwards-compatible in mind, we enable a config option CONFIG_USB_I2C_MAX_WRITE_COUNT that will enlarge the USB RX queue. BRANCH=none BUG=b:35587174 TEST=Complete presubmit test. TEST=Manually update elan trackpad firmware with interrupt disabled. Change-Id: Ia8983b036b7297f7ca673459ae34b7e5ecd2ee01 Reviewed-on: https://chromium-review.googlesource.com/513642 Commit-Ready: Chun-ta Lin <itspeter@chromium.org> Tested-by: Chun-ta Lin <itspeter@chromium.org> Reviewed-by: Chun-ta Lin <itspeter@chromium.org> Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
135 lines
3.5 KiB
C
135 lines
3.5 KiB
C
/* Copyright 2016 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 "common.h"
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#include "link_defs.h"
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#include "registers.h"
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#include "i2c.h"
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#include "usb_descriptor.h"
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#include "util.h"
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#include "common.h"
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#include "console.h"
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#include "consumer.h"
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#include "queue.h"
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#include "queue_policies.h"
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#include "producer.h"
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#include "task.h"
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#include "usb-stream.h"
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#include "usb_i2c.h"
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#define CPRINTS(format, args...) cprints(CC_I2C, format, ## args)
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USB_I2C_CONFIG(i2c,
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USB_IFACE_I2C,
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USB_STR_I2C_NAME,
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USB_EP_I2C)
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static int16_t usb_i2c_map_error(int error)
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{
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switch (error) {
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case EC_SUCCESS: return USB_I2C_SUCCESS;
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case EC_ERROR_TIMEOUT: return USB_I2C_TIMEOUT;
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case EC_ERROR_BUSY: return USB_I2C_BUSY;
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default: return USB_I2C_UNKNOWN_ERROR | (error & 0x7fff);
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}
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}
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static uint8_t usb_i2c_read_packet(struct usb_i2c_config const *config)
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{
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return QUEUE_REMOVE_UNITS(config->consumer.queue, config->buffer,
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queue_count(config->consumer.queue));
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}
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static void usb_i2c_write_packet(struct usb_i2c_config const *config,
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uint8_t count)
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{
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QUEUE_ADD_UNITS(config->tx_queue, config->buffer, count);
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}
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static uint8_t usb_i2c_executable(struct usb_i2c_config const *config)
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{
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/*
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* In order to support larger write payload, we need to peek
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* the queue to see if we need to wait for more data.
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*/
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uint8_t write_count;
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if (queue_peek_units(config->consumer.queue, &write_count, 2, 1) == 1
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&& (write_count + 4) > queue_count(config->consumer.queue)) {
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/*
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* Feed me more data, please.
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* Reuse the buffer in usb_i2c_config to send ACK packet.
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*/
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config->buffer[0] = USB_I2C_SUCCESS;
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config->buffer[1] = 0;
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usb_i2c_write_packet(config, 4);
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return 0;
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}
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return 1;
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}
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void usb_i2c_execute(struct usb_i2c_config const *config)
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{
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/* Payload is ready to execute. */
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uint8_t count = usb_i2c_read_packet(config);
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int portindex = (config->buffer[0] >> 0) & 0xff;
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/* Convert 7-bit slave address to chromium EC 8-bit address. */
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uint8_t slave_addr = (config->buffer[0] >> 7) & 0xfe;
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int write_count = (config->buffer[1] >> 0) & 0xff;
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int read_count = (config->buffer[1] >> 8) & 0xff;
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int port;
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config->buffer[0] = 0;
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config->buffer[1] = 0;
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if (!count || (!read_count && !write_count))
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return;
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if (write_count > CONFIG_USB_I2C_MAX_WRITE_COUNT ||
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write_count != (count - 4)) {
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config->buffer[0] = USB_I2C_WRITE_COUNT_INVALID;
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} else if (read_count > USB_I2C_MAX_READ_COUNT) {
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config->buffer[0] = USB_I2C_READ_COUNT_INVALID;
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} else if (portindex >= i2c_ports_used) {
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config->buffer[0] = USB_I2C_PORT_INVALID;
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} else {
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port = i2c_ports[portindex].port;
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config->buffer[0] = usb_i2c_map_error(
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i2c_xfer(port, slave_addr,
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(uint8_t *)(config->buffer + 2),
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write_count,
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(uint8_t *)(config->buffer + 2),
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read_count, I2C_XFER_SINGLE));
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}
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usb_i2c_write_packet(config, read_count + 4);
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}
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void usb_i2c_deferred(struct usb_i2c_config const *config)
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{
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/* Check if we can proceed the queue. */
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if (usb_i2c_executable(config))
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usb_i2c_execute(config);
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}
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static void usb_i2c_written(struct consumer const *consumer, size_t count)
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{
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struct usb_i2c_config const *config =
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DOWNCAST(consumer, struct usb_i2c_config, consumer);
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hook_call_deferred(config->deferred, 0);
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}
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static void usb_i2c_flush(struct consumer const *consumer)
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{
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}
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struct consumer_ops const usb_i2c_consumer_ops = {
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.written = usb_i2c_written,
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.flush = usb_i2c_flush,
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};
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