diff options
Diffstat (limited to 'common/usb_i2c.c')
| -rw-r--r-- | common/usb_i2c.c | 196 |
1 files changed, 0 insertions, 196 deletions
diff --git a/common/usb_i2c.c b/common/usb_i2c.c deleted file mode 100644 index ace2e7139c..0000000000 --- a/common/usb_i2c.c +++ /dev/null @@ -1,196 +0,0 @@ -/* 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 "common.h" -#include "link_defs.h" -#include "registers.h" -#include "i2c.h" -#include "usb_descriptor.h" -#include "util.h" - -#include "common.h" -#include "console.h" -#include "consumer.h" -#include "producer.h" -#include "queue.h" -#include "queue_policies.h" -#include "task.h" -#include "usb-stream.h" -#include "usb_i2c.h" - - -#define CPRINTS(format, args...) cprints(CC_I2C, format, ## args) - - -USB_I2C_CONFIG(i2c, - USB_IFACE_I2C, - USB_STR_I2C_NAME, - USB_EP_I2C) - -static int (*cros_cmd_handler)(void *data_in, - size_t in_size, - void *data_out, - size_t out_size); - -static int16_t usb_i2c_map_error(int error) -{ - switch (error) { - case EC_SUCCESS: return USB_I2C_SUCCESS; - case EC_ERROR_TIMEOUT: return USB_I2C_TIMEOUT; - case EC_ERROR_BUSY: return USB_I2C_BUSY; - default: return USB_I2C_UNKNOWN_ERROR | (error & 0x7fff); - } -} - -/* - * Return value should be large enough to accommodate the entire read queue - * buffer size. Let's use 4 bytes in case future designs have a lot of RAM and - * allow for large buffers. - */ -static uint32_t usb_i2c_read_packet(struct usb_i2c_config const *config) -{ - return QUEUE_REMOVE_UNITS(config->consumer.queue, config->buffer, - queue_count(config->consumer.queue)); -} - -static void usb_i2c_write_packet(struct usb_i2c_config const *config, - size_t count) -{ - QUEUE_ADD_UNITS(config->tx_queue, config->buffer, count); -} - -static uint8_t usb_i2c_executable(struct usb_i2c_config const *config) -{ - static size_t expected_size; - - if (!expected_size) { - uint8_t peek[4]; - - /* - * In order to support larger write payload, we need to peek - * the queue to see if we need to wait for more data. - */ - if (queue_peek_units(config->consumer.queue, - peek, 0, sizeof(peek)) - != sizeof(peek)) { - /* Not enough data to calculate expected_size. */ - return 0; - } - /* - * The first four bytes of the packet will describe its - * expected size. - */ - /* Header bytes and extra rc bytes, if present. */ - if (peek[3] & 0x80) - expected_size = 6; - else - expected_size = 4; - - /* write count */ - expected_size += (((size_t)peek[0] & 0xf0) << 4) | peek[2]; - } - - - if (queue_count(config->consumer.queue) >= expected_size) { - expected_size = 0; - return 1; - } - - return 0; -} - -static void usb_i2c_execute(struct usb_i2c_config const *config) -{ - /* Payload is ready to execute. */ - uint32_t count = usb_i2c_read_packet(config); - int portindex = (config->buffer[0] >> 0) & 0xf; - uint16_t addr_flags = (config->buffer[0] >> 8) & 0x7f; - int write_count = ((config->buffer[0] << 4) & 0xf00) | - ((config->buffer[1] >> 0) & 0xff); - int read_count = (config->buffer[1] >> 8) & 0xff; - int offset = 0; /* Offset for extended reading header. */ - - config->buffer[0] = 0; - config->buffer[1] = 0; - - if (read_count & 0x80) { - read_count = ((config->buffer[2] & 0xff) << 7) | - (read_count & 0x7f); - offset = 2; - } - - if (!count || (!read_count && !write_count)) - return; - - if (!usb_i2c_board_is_enabled()) { - config->buffer[0] = USB_I2C_DISABLED; - } else if (write_count > CONFIG_USB_I2C_MAX_WRITE_COUNT || - write_count != (count - 4 - offset)) { - config->buffer[0] = USB_I2C_WRITE_COUNT_INVALID; - } else if (read_count > CONFIG_USB_I2C_MAX_READ_COUNT) { - config->buffer[0] = USB_I2C_READ_COUNT_INVALID; - } else if (portindex >= i2c_ports_used) { - config->buffer[0] = USB_I2C_PORT_INVALID; - } else if (addr_flags == USB_I2C_CMD_ADDR_FLAGS) { - /* - * This is a non-i2c command, invoke the handler if it has - * been registered, if not - report the appropriate error. - */ - if (!cros_cmd_handler) - config->buffer[0] = USB_I2C_MISSING_HANDLER; - else - config->buffer[0] = cros_cmd_handler(config->buffer + 2, - write_count, - config->buffer + 2, - read_count); - } else { - int ret; - - /* - * TODO (crbug.com/750397): Add security. This currently - * blindly passes through ALL I2C commands on any bus the EC - * knows about. It should behave closer to - * EC_CMD_I2C_PASSTHRU, which can protect ports and ranges. - */ - ret = i2c_xfer(i2c_ports[portindex].port, addr_flags, - (uint8_t *)(config->buffer + 2) + offset, - write_count, - (uint8_t *)(config->buffer + 2), - read_count); - config->buffer[0] = usb_i2c_map_error(ret); - } - usb_i2c_write_packet(config, read_count + 4); -} - -void usb_i2c_deferred(struct usb_i2c_config const *config) -{ - /* Check if we can proceed the queue. */ - if (usb_i2c_executable(config)) - usb_i2c_execute(config); -} - -static void usb_i2c_written(struct consumer const *consumer, size_t count) -{ - struct usb_i2c_config const *config = - DOWNCAST(consumer, struct usb_i2c_config, consumer); - - hook_call_deferred(config->deferred, 0); -} - -struct consumer_ops const usb_i2c_consumer_ops = { - .written = usb_i2c_written, -}; - -int usb_i2c_register_cros_cmd_handler(int (*cmd_handler) - (void *data_in, - size_t in_size, - void *data_out, - size_t out_size)) -{ - if (cros_cmd_handler) - return -1; - cros_cmd_handler = cmd_handler; - return 0; -} |