// SPDX-License-Identifier: GPL-2.0+ /* * MaxLinear/Exar USB to Serial driver * * Copyright (c) 2020 Manivannan Sadhasivam <[email protected]> * Copyright (c) 2021 Johan Hovold <[email protected]> * * Based on the initial driver written by Patong Yang: * * https://lore.kernel.org/r/20180404070634.nhspvmxcjwfgjkcv@advantechmxl-desktop * * Copyright (c) 2018 Patong Yang <[email protected]> */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/tty.h> #include <linux/usb.h> #include <linux/usb/cdc.h> #include <linux/usb/serial.h> struct xr_txrx_clk_mask { … }; #define XR_INT_OSC_HZ … #define XR21V141X_MIN_SPEED … #define XR21V141X_MAX_SPEED … /* XR21V141X register blocks */ #define XR21V141X_UART_REG_BLOCK … #define XR21V141X_UM_REG_BLOCK … #define XR21V141X_UART_CUSTOM_BLOCK … /* XR21V141X UART registers */ #define XR21V141X_CLOCK_DIVISOR_0 … #define XR21V141X_CLOCK_DIVISOR_1 … #define XR21V141X_CLOCK_DIVISOR_2 … #define XR21V141X_TX_CLOCK_MASK_0 … #define XR21V141X_TX_CLOCK_MASK_1 … #define XR21V141X_RX_CLOCK_MASK_0 … #define XR21V141X_RX_CLOCK_MASK_1 … #define XR21V141X_REG_FORMAT … /* XR21V141X UART Manager registers */ #define XR21V141X_UM_FIFO_ENABLE_REG … #define XR21V141X_UM_ENABLE_TX_FIFO … #define XR21V141X_UM_ENABLE_RX_FIFO … #define XR21V141X_UM_RX_FIFO_RESET … #define XR21V141X_UM_TX_FIFO_RESET … #define XR_UART_ENABLE_TX … #define XR_UART_ENABLE_RX … #define XR_GPIO_RI … #define XR_GPIO_CD … #define XR_GPIO_DSR … #define XR_GPIO_DTR … #define XR_GPIO_CTS … #define XR_GPIO_RTS … #define XR_GPIO_CLK … #define XR_GPIO_XEN … #define XR_GPIO_TXT … #define XR_GPIO_RXT … #define XR_UART_DATA_MASK … #define XR_UART_DATA_7 … #define XR_UART_DATA_8 … #define XR_UART_PARITY_MASK … #define XR_UART_PARITY_SHIFT … #define XR_UART_PARITY_NONE … #define XR_UART_PARITY_ODD … #define XR_UART_PARITY_EVEN … #define XR_UART_PARITY_MARK … #define XR_UART_PARITY_SPACE … #define XR_UART_STOP_MASK … #define XR_UART_STOP_SHIFT … #define XR_UART_STOP_1 … #define XR_UART_STOP_2 … #define XR_UART_FLOW_MODE_NONE … #define XR_UART_FLOW_MODE_HW … #define XR_UART_FLOW_MODE_SW … #define XR_GPIO_MODE_SEL_MASK … #define XR_GPIO_MODE_SEL_RTS_CTS … #define XR_GPIO_MODE_SEL_DTR_DSR … #define XR_GPIO_MODE_SEL_RS485 … #define XR_GPIO_MODE_SEL_RS485_ADDR … #define XR_GPIO_MODE_RS485_TX_H … #define XR_GPIO_MODE_TX_TOGGLE … #define XR_GPIO_MODE_RX_TOGGLE … #define XR_FIFO_RESET … #define XR_CUSTOM_DRIVER_ACTIVE … static int xr21v141x_uart_enable(struct usb_serial_port *port); static int xr21v141x_uart_disable(struct usb_serial_port *port); static int xr21v141x_fifo_reset(struct usb_serial_port *port); static void xr21v141x_set_line_settings(struct tty_struct *tty, struct usb_serial_port *port, const struct ktermios *old_termios); struct xr_type { … }; enum xr_type_id { … }; static const struct xr_type xr_types[] = …; struct xr_data { … }; static int xr_set_reg(struct usb_serial_port *port, u8 channel, u16 reg, u16 val) { … } static int xr_get_reg(struct usb_serial_port *port, u8 channel, u16 reg, u16 *val) { … } static int xr_set_reg_uart(struct usb_serial_port *port, u16 reg, u16 val) { … } static int xr_get_reg_uart(struct usb_serial_port *port, u16 reg, u16 *val) { … } static int xr_set_reg_um(struct usb_serial_port *port, u8 reg_base, u8 val) { … } static int __xr_uart_enable(struct usb_serial_port *port) { … } static int __xr_uart_disable(struct usb_serial_port *port) { … } /* * According to datasheet, below is the recommended sequence for enabling UART * module in XR21V141X: * * Enable Tx FIFO * Enable Tx and Rx * Enable Rx FIFO */ static int xr21v141x_uart_enable(struct usb_serial_port *port) { … } static int xr21v141x_uart_disable(struct usb_serial_port *port) { … } static int xr_uart_enable(struct usb_serial_port *port) { … } static int xr_uart_disable(struct usb_serial_port *port) { … } static int xr21v141x_fifo_reset(struct usb_serial_port *port) { … } static int xr_fifo_reset(struct usb_serial_port *port) { … } static int xr_tiocmget(struct tty_struct *tty) { … } static int xr_tiocmset_port(struct usb_serial_port *port, unsigned int set, unsigned int clear) { … } static int xr_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) { … } static void xr_dtr_rts(struct usb_serial_port *port, int on) { … } static int xr_break_ctl(struct tty_struct *tty, int break_state) { … } /* Tx and Rx clock mask values obtained from section 3.3.4 of datasheet */ static const struct xr_txrx_clk_mask xr21v141x_txrx_clk_masks[] = …; static int xr21v141x_set_baudrate(struct tty_struct *tty, struct usb_serial_port *port) { … } static void xr_set_flow_mode(struct tty_struct *tty, struct usb_serial_port *port, const struct ktermios *old_termios) { … } static void xr21v141x_set_line_settings(struct tty_struct *tty, struct usb_serial_port *port, const struct ktermios *old_termios) { … } static void xr_cdc_set_line_coding(struct tty_struct *tty, struct usb_serial_port *port, const struct ktermios *old_termios) { … } static void xr_sanitize_serial_rs485(struct serial_rs485 *rs485) { … } static int xr_get_rs485_config(struct tty_struct *tty, struct serial_rs485 __user *argp) { … } static int xr_set_rs485_config(struct tty_struct *tty, struct serial_rs485 __user *argp) { … } static int xr_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) { … } static void xr_set_termios(struct tty_struct *tty, struct usb_serial_port *port, const struct ktermios *old_termios) { … } static int xr_open(struct tty_struct *tty, struct usb_serial_port *port) { … } static void xr_close(struct usb_serial_port *port) { … } static int xr_probe(struct usb_serial *serial, const struct usb_device_id *id) { … } static int xr_gpio_init(struct usb_serial_port *port, const struct xr_type *type) { … } static int xr_port_probe(struct usb_serial_port *port) { … } static void xr_port_remove(struct usb_serial_port *port) { … } #define XR_DEVICE(vid, pid, type) … static const struct usb_device_id id_table[] = …; MODULE_DEVICE_TABLE(usb, id_table); static struct usb_serial_driver xr_device = …; static struct usb_serial_driver * const serial_drivers[] = …; module_usb_serial_driver(…); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
Codebase Browser
linux