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- Introduction
- ============
- Gadget serial driver is divided into two parts.
- 1. f_serial.c : Interacts with USB Gadget Layer
- 2. u_serial.c : Interacts with TTY Layer
- Gadget smd driver adds capability to interact with smd layer in
- case modem device is inter-connected with smd interface.
- S/W Description
- ===============
- Gadget smd driver is a simple bridge driver between usb serial
- gadget and smd abstraction layer. It registers with smd
- abstraction layer with notification call back and provides
- USB connect/disconnect call backs usb gadget serial driver.
- S/W Control Flow:
- =================
- USB SMD driver registers w/ SMD driver and provides notification
- call back. SMD Driver calls this call back whenever DATA is available
- to read, buffer is available to write or modem control signals changed.
- Upon receiving notification from SMD driver, USB driver appropriately
- schedules read/write works. In case of control singals, USB driver
- notifies gadget component with changed control information.
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