1023 lines
24 KiB
C
1023 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* MaxLinear/Exar USB to Serial driver
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*
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* Copyright (c) 2020 Manivannan Sadhasivam <mani@kernel.org>
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* Copyright (c) 2021 Johan Hovold <johan@kernel.org>
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*
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* Based on the initial driver written by Patong Yang:
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*
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* https://lore.kernel.org/r/20180404070634.nhspvmxcjwfgjkcv@advantechmxl-desktop
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*
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* Copyright (c) 2018 Patong Yang <patong.mxl@gmail.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/usb.h>
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#include <linux/usb/cdc.h>
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#include <linux/usb/serial.h>
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struct xr_txrx_clk_mask {
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u16 tx;
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u16 rx0;
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u16 rx1;
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};
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#define XR_INT_OSC_HZ 48000000U
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#define XR21V141X_MIN_SPEED 46U
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#define XR21V141X_MAX_SPEED XR_INT_OSC_HZ
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/* XR21V141X register blocks */
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#define XR21V141X_UART_REG_BLOCK 0
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#define XR21V141X_UM_REG_BLOCK 4
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#define XR21V141X_UART_CUSTOM_BLOCK 0x66
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/* XR21V141X UART registers */
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#define XR21V141X_CLOCK_DIVISOR_0 0x04
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#define XR21V141X_CLOCK_DIVISOR_1 0x05
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#define XR21V141X_CLOCK_DIVISOR_2 0x06
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#define XR21V141X_TX_CLOCK_MASK_0 0x07
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#define XR21V141X_TX_CLOCK_MASK_1 0x08
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#define XR21V141X_RX_CLOCK_MASK_0 0x09
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#define XR21V141X_RX_CLOCK_MASK_1 0x0a
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#define XR21V141X_REG_FORMAT 0x0b
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/* XR21V141X UART Manager registers */
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#define XR21V141X_UM_FIFO_ENABLE_REG 0x10
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#define XR21V141X_UM_ENABLE_TX_FIFO 0x01
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#define XR21V141X_UM_ENABLE_RX_FIFO 0x02
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#define XR21V141X_UM_RX_FIFO_RESET 0x18
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#define XR21V141X_UM_TX_FIFO_RESET 0x1c
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#define XR_UART_ENABLE_TX 0x1
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#define XR_UART_ENABLE_RX 0x2
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#define XR_GPIO_RI BIT(0)
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#define XR_GPIO_CD BIT(1)
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#define XR_GPIO_DSR BIT(2)
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#define XR_GPIO_DTR BIT(3)
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#define XR_GPIO_CTS BIT(4)
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#define XR_GPIO_RTS BIT(5)
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#define XR_GPIO_CLK BIT(6)
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#define XR_GPIO_XEN BIT(7)
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#define XR_GPIO_TXT BIT(8)
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#define XR_GPIO_RXT BIT(9)
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#define XR_UART_DATA_MASK GENMASK(3, 0)
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#define XR_UART_DATA_7 0x7
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#define XR_UART_DATA_8 0x8
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#define XR_UART_PARITY_MASK GENMASK(6, 4)
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#define XR_UART_PARITY_SHIFT 4
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#define XR_UART_PARITY_NONE (0x0 << XR_UART_PARITY_SHIFT)
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#define XR_UART_PARITY_ODD (0x1 << XR_UART_PARITY_SHIFT)
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#define XR_UART_PARITY_EVEN (0x2 << XR_UART_PARITY_SHIFT)
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#define XR_UART_PARITY_MARK (0x3 << XR_UART_PARITY_SHIFT)
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#define XR_UART_PARITY_SPACE (0x4 << XR_UART_PARITY_SHIFT)
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#define XR_UART_STOP_MASK BIT(7)
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#define XR_UART_STOP_SHIFT 7
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#define XR_UART_STOP_1 (0x0 << XR_UART_STOP_SHIFT)
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#define XR_UART_STOP_2 (0x1 << XR_UART_STOP_SHIFT)
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#define XR_UART_FLOW_MODE_NONE 0x0
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#define XR_UART_FLOW_MODE_HW 0x1
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#define XR_UART_FLOW_MODE_SW 0x2
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#define XR_GPIO_MODE_SEL_MASK GENMASK(2, 0)
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#define XR_GPIO_MODE_SEL_RTS_CTS 0x1
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#define XR_GPIO_MODE_SEL_DTR_DSR 0x2
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#define XR_GPIO_MODE_SEL_RS485 0x3
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#define XR_GPIO_MODE_SEL_RS485_ADDR 0x4
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#define XR_GPIO_MODE_TX_TOGGLE 0x100
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#define XR_GPIO_MODE_RX_TOGGLE 0x200
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#define XR_FIFO_RESET 0x1
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#define XR_CUSTOM_DRIVER_ACTIVE 0x1
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static int xr21v141x_uart_enable(struct usb_serial_port *port);
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static int xr21v141x_uart_disable(struct usb_serial_port *port);
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static int xr21v141x_fifo_reset(struct usb_serial_port *port);
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static void xr21v141x_set_line_settings(struct tty_struct *tty,
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struct usb_serial_port *port, struct ktermios *old_termios);
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struct xr_type {
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int reg_width;
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u8 reg_recipient;
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u8 set_reg;
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u8 get_reg;
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u16 uart_enable;
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u16 flow_control;
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u16 xon_char;
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u16 xoff_char;
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u16 tx_break;
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u16 gpio_mode;
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u16 gpio_direction;
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u16 gpio_set;
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u16 gpio_clear;
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u16 gpio_status;
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u16 tx_fifo_reset;
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u16 rx_fifo_reset;
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u16 custom_driver;
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bool have_5_6_bit_mode;
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bool have_xmit_toggle;
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int (*enable)(struct usb_serial_port *port);
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int (*disable)(struct usb_serial_port *port);
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int (*fifo_reset)(struct usb_serial_port *port);
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void (*set_line_settings)(struct tty_struct *tty,
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struct usb_serial_port *port,
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struct ktermios *old_termios);
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};
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enum xr_type_id {
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XR21V141X,
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XR21B142X,
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XR21B1411,
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XR2280X,
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XR_TYPE_COUNT,
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};
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static const struct xr_type xr_types[] = {
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[XR21V141X] = {
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.reg_width = 8,
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.reg_recipient = USB_RECIP_DEVICE,
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.set_reg = 0x00,
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.get_reg = 0x01,
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.uart_enable = 0x03,
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.flow_control = 0x0c,
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.xon_char = 0x10,
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.xoff_char = 0x11,
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.tx_break = 0x14,
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.gpio_mode = 0x1a,
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.gpio_direction = 0x1b,
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.gpio_set = 0x1d,
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.gpio_clear = 0x1e,
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.gpio_status = 0x1f,
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.enable = xr21v141x_uart_enable,
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.disable = xr21v141x_uart_disable,
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.fifo_reset = xr21v141x_fifo_reset,
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.set_line_settings = xr21v141x_set_line_settings,
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},
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[XR21B142X] = {
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.reg_width = 16,
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.reg_recipient = USB_RECIP_INTERFACE,
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.set_reg = 0x00,
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.get_reg = 0x00,
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.uart_enable = 0x00,
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.flow_control = 0x06,
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.xon_char = 0x07,
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.xoff_char = 0x08,
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.tx_break = 0x0a,
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.gpio_mode = 0x0c,
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.gpio_direction = 0x0d,
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.gpio_set = 0x0e,
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.gpio_clear = 0x0f,
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.gpio_status = 0x10,
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.tx_fifo_reset = 0x40,
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.rx_fifo_reset = 0x43,
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.custom_driver = 0x60,
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.have_5_6_bit_mode = true,
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.have_xmit_toggle = true,
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},
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[XR21B1411] = {
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.reg_width = 12,
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.reg_recipient = USB_RECIP_DEVICE,
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.set_reg = 0x00,
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.get_reg = 0x01,
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.uart_enable = 0xc00,
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.flow_control = 0xc06,
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.xon_char = 0xc07,
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.xoff_char = 0xc08,
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.tx_break = 0xc0a,
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.gpio_mode = 0xc0c,
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.gpio_direction = 0xc0d,
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.gpio_set = 0xc0e,
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.gpio_clear = 0xc0f,
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.gpio_status = 0xc10,
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.tx_fifo_reset = 0xc80,
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.rx_fifo_reset = 0xcc0,
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.custom_driver = 0x20d,
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},
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[XR2280X] = {
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.reg_width = 16,
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.reg_recipient = USB_RECIP_DEVICE,
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.set_reg = 0x05,
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.get_reg = 0x05,
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.uart_enable = 0x40,
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.flow_control = 0x46,
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.xon_char = 0x47,
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.xoff_char = 0x48,
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.tx_break = 0x4a,
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.gpio_mode = 0x4c,
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.gpio_direction = 0x4d,
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.gpio_set = 0x4e,
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.gpio_clear = 0x4f,
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.gpio_status = 0x50,
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.tx_fifo_reset = 0x60,
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.rx_fifo_reset = 0x63,
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.custom_driver = 0x81,
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},
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};
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struct xr_data {
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const struct xr_type *type;
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u8 channel; /* zero-based index or interface number */
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};
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static int xr_set_reg(struct usb_serial_port *port, u8 channel, u16 reg, u16 val)
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{
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struct xr_data *data = usb_get_serial_port_data(port);
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const struct xr_type *type = data->type;
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struct usb_serial *serial = port->serial;
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int ret;
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ret = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
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type->set_reg,
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USB_DIR_OUT | USB_TYPE_VENDOR | type->reg_recipient,
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val, (channel << 8) | reg, NULL, 0,
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USB_CTRL_SET_TIMEOUT);
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if (ret < 0) {
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dev_err(&port->dev, "Failed to set reg 0x%02x: %d\n", reg, ret);
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return ret;
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}
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return 0;
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}
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static int xr_get_reg(struct usb_serial_port *port, u8 channel, u16 reg, u16 *val)
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{
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struct xr_data *data = usb_get_serial_port_data(port);
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const struct xr_type *type = data->type;
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struct usb_serial *serial = port->serial;
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u8 *dmabuf;
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int ret, len;
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if (type->reg_width == 8)
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len = 1;
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else
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len = 2;
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dmabuf = kmalloc(len, GFP_KERNEL);
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if (!dmabuf)
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return -ENOMEM;
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ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
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type->get_reg,
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USB_DIR_IN | USB_TYPE_VENDOR | type->reg_recipient,
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0, (channel << 8) | reg, dmabuf, len,
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USB_CTRL_GET_TIMEOUT);
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if (ret == len) {
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if (len == 2)
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*val = le16_to_cpup((__le16 *)dmabuf);
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else
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*val = *dmabuf;
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ret = 0;
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} else {
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dev_err(&port->dev, "Failed to get reg 0x%02x: %d\n", reg, ret);
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if (ret >= 0)
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ret = -EIO;
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}
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kfree(dmabuf);
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return ret;
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}
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static int xr_set_reg_uart(struct usb_serial_port *port, u16 reg, u16 val)
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{
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struct xr_data *data = usb_get_serial_port_data(port);
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return xr_set_reg(port, data->channel, reg, val);
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}
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static int xr_get_reg_uart(struct usb_serial_port *port, u16 reg, u16 *val)
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{
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struct xr_data *data = usb_get_serial_port_data(port);
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return xr_get_reg(port, data->channel, reg, val);
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}
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static int xr_set_reg_um(struct usb_serial_port *port, u8 reg_base, u8 val)
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{
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struct xr_data *data = usb_get_serial_port_data(port);
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u8 reg;
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reg = reg_base + data->channel;
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return xr_set_reg(port, XR21V141X_UM_REG_BLOCK, reg, val);
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}
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static int __xr_uart_enable(struct usb_serial_port *port)
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{
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struct xr_data *data = usb_get_serial_port_data(port);
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return xr_set_reg_uart(port, data->type->uart_enable,
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XR_UART_ENABLE_TX | XR_UART_ENABLE_RX);
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}
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static int __xr_uart_disable(struct usb_serial_port *port)
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{
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struct xr_data *data = usb_get_serial_port_data(port);
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return xr_set_reg_uart(port, data->type->uart_enable, 0);
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}
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/*
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* According to datasheet, below is the recommended sequence for enabling UART
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* module in XR21V141X:
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*
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* Enable Tx FIFO
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* Enable Tx and Rx
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* Enable Rx FIFO
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*/
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static int xr21v141x_uart_enable(struct usb_serial_port *port)
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{
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int ret;
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ret = xr_set_reg_um(port, XR21V141X_UM_FIFO_ENABLE_REG,
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XR21V141X_UM_ENABLE_TX_FIFO);
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if (ret)
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return ret;
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ret = __xr_uart_enable(port);
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if (ret)
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return ret;
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ret = xr_set_reg_um(port, XR21V141X_UM_FIFO_ENABLE_REG,
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XR21V141X_UM_ENABLE_TX_FIFO | XR21V141X_UM_ENABLE_RX_FIFO);
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if (ret)
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__xr_uart_disable(port);
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return ret;
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}
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static int xr21v141x_uart_disable(struct usb_serial_port *port)
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{
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int ret;
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ret = __xr_uart_disable(port);
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if (ret)
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return ret;
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ret = xr_set_reg_um(port, XR21V141X_UM_FIFO_ENABLE_REG, 0);
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return ret;
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}
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static int xr_uart_enable(struct usb_serial_port *port)
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{
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struct xr_data *data = usb_get_serial_port_data(port);
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if (data->type->enable)
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return data->type->enable(port);
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return __xr_uart_enable(port);
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}
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static int xr_uart_disable(struct usb_serial_port *port)
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{
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struct xr_data *data = usb_get_serial_port_data(port);
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if (data->type->disable)
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return data->type->disable(port);
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return __xr_uart_disable(port);
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}
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static int xr21v141x_fifo_reset(struct usb_serial_port *port)
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{
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int ret;
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ret = xr_set_reg_um(port, XR21V141X_UM_TX_FIFO_RESET, XR_FIFO_RESET);
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if (ret)
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return ret;
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ret = xr_set_reg_um(port, XR21V141X_UM_RX_FIFO_RESET, XR_FIFO_RESET);
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if (ret)
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return ret;
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return 0;
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}
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static int xr_fifo_reset(struct usb_serial_port *port)
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{
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struct xr_data *data = usb_get_serial_port_data(port);
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int ret;
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if (data->type->fifo_reset)
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return data->type->fifo_reset(port);
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ret = xr_set_reg_uart(port, data->type->tx_fifo_reset, XR_FIFO_RESET);
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if (ret)
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return ret;
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ret = xr_set_reg_uart(port, data->type->rx_fifo_reset, XR_FIFO_RESET);
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if (ret)
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return ret;
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return 0;
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}
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static int xr_tiocmget(struct tty_struct *tty)
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{
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struct usb_serial_port *port = tty->driver_data;
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struct xr_data *data = usb_get_serial_port_data(port);
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u16 status;
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int ret;
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ret = xr_get_reg_uart(port, data->type->gpio_status, &status);
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if (ret)
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return ret;
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/*
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* Modem control pins are active low, so reading '0' means it is active
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* and '1' means not active.
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*/
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ret = ((status & XR_GPIO_DTR) ? 0 : TIOCM_DTR) |
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((status & XR_GPIO_RTS) ? 0 : TIOCM_RTS) |
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((status & XR_GPIO_CTS) ? 0 : TIOCM_CTS) |
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((status & XR_GPIO_DSR) ? 0 : TIOCM_DSR) |
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((status & XR_GPIO_RI) ? 0 : TIOCM_RI) |
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((status & XR_GPIO_CD) ? 0 : TIOCM_CD);
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return ret;
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}
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static int xr_tiocmset_port(struct usb_serial_port *port,
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unsigned int set, unsigned int clear)
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{
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struct xr_data *data = usb_get_serial_port_data(port);
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const struct xr_type *type = data->type;
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u16 gpio_set = 0;
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u16 gpio_clr = 0;
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int ret = 0;
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/* Modem control pins are active low, so set & clr are swapped */
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if (set & TIOCM_RTS)
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gpio_clr |= XR_GPIO_RTS;
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if (set & TIOCM_DTR)
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gpio_clr |= XR_GPIO_DTR;
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if (clear & TIOCM_RTS)
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gpio_set |= XR_GPIO_RTS;
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if (clear & TIOCM_DTR)
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gpio_set |= XR_GPIO_DTR;
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/* Writing '0' to gpio_{set/clr} bits has no effect, so no need to do */
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if (gpio_clr)
|
|
ret = xr_set_reg_uart(port, type->gpio_clear, gpio_clr);
|
|
|
|
if (gpio_set)
|
|
ret = xr_set_reg_uart(port, type->gpio_set, gpio_set);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int xr_tiocmset(struct tty_struct *tty,
|
|
unsigned int set, unsigned int clear)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
|
|
return xr_tiocmset_port(port, set, clear);
|
|
}
|
|
|
|
static void xr_dtr_rts(struct usb_serial_port *port, int on)
|
|
{
|
|
if (on)
|
|
xr_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0);
|
|
else
|
|
xr_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS);
|
|
}
|
|
|
|
static void xr_break_ctl(struct tty_struct *tty, int break_state)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct xr_data *data = usb_get_serial_port_data(port);
|
|
const struct xr_type *type = data->type;
|
|
u16 state;
|
|
|
|
if (break_state == 0)
|
|
state = 0;
|
|
else
|
|
state = GENMASK(type->reg_width - 1, 0);
|
|
|
|
dev_dbg(&port->dev, "Turning break %s\n", state == 0 ? "off" : "on");
|
|
|
|
xr_set_reg_uart(port, type->tx_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[] = {
|
|
{ 0x000, 0x000, 0x000 },
|
|
{ 0x000, 0x000, 0x000 },
|
|
{ 0x100, 0x000, 0x100 },
|
|
{ 0x020, 0x400, 0x020 },
|
|
{ 0x010, 0x100, 0x010 },
|
|
{ 0x208, 0x040, 0x208 },
|
|
{ 0x104, 0x820, 0x108 },
|
|
{ 0x844, 0x210, 0x884 },
|
|
{ 0x444, 0x110, 0x444 },
|
|
{ 0x122, 0x888, 0x224 },
|
|
{ 0x912, 0x448, 0x924 },
|
|
{ 0x492, 0x248, 0x492 },
|
|
{ 0x252, 0x928, 0x292 },
|
|
{ 0x94a, 0x4a4, 0xa52 },
|
|
{ 0x52a, 0xaa4, 0x54a },
|
|
{ 0xaaa, 0x954, 0x4aa },
|
|
{ 0xaaa, 0x554, 0xaaa },
|
|
{ 0x555, 0xad4, 0x5aa },
|
|
{ 0xb55, 0xab4, 0x55a },
|
|
{ 0x6b5, 0x5ac, 0xb56 },
|
|
{ 0x5b5, 0xd6c, 0x6d6 },
|
|
{ 0xb6d, 0xb6a, 0xdb6 },
|
|
{ 0x76d, 0x6da, 0xbb6 },
|
|
{ 0xedd, 0xdda, 0x76e },
|
|
{ 0xddd, 0xbba, 0xeee },
|
|
{ 0x7bb, 0xf7a, 0xdde },
|
|
{ 0xf7b, 0xef6, 0x7de },
|
|
{ 0xdf7, 0xbf6, 0xf7e },
|
|
{ 0x7f7, 0xfee, 0xefe },
|
|
{ 0xfdf, 0xfbe, 0x7fe },
|
|
{ 0xf7f, 0xefe, 0xffe },
|
|
{ 0xfff, 0xffe, 0xffd },
|
|
};
|
|
|
|
static int xr21v141x_set_baudrate(struct tty_struct *tty, struct usb_serial_port *port)
|
|
{
|
|
u32 divisor, baud, idx;
|
|
u16 tx_mask, rx_mask;
|
|
int ret;
|
|
|
|
baud = tty->termios.c_ospeed;
|
|
if (!baud)
|
|
return 0;
|
|
|
|
baud = clamp(baud, XR21V141X_MIN_SPEED, XR21V141X_MAX_SPEED);
|
|
divisor = XR_INT_OSC_HZ / baud;
|
|
idx = ((32 * XR_INT_OSC_HZ) / baud) & 0x1f;
|
|
tx_mask = xr21v141x_txrx_clk_masks[idx].tx;
|
|
|
|
if (divisor & 0x01)
|
|
rx_mask = xr21v141x_txrx_clk_masks[idx].rx1;
|
|
else
|
|
rx_mask = xr21v141x_txrx_clk_masks[idx].rx0;
|
|
|
|
dev_dbg(&port->dev, "Setting baud rate: %u\n", baud);
|
|
/*
|
|
* XR21V141X uses fractional baud rate generator with 48MHz internal
|
|
* oscillator and 19-bit programmable divisor. So theoretically it can
|
|
* generate most commonly used baud rates with high accuracy.
|
|
*/
|
|
ret = xr_set_reg_uart(port, XR21V141X_CLOCK_DIVISOR_0,
|
|
divisor & 0xff);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = xr_set_reg_uart(port, XR21V141X_CLOCK_DIVISOR_1,
|
|
(divisor >> 8) & 0xff);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = xr_set_reg_uart(port, XR21V141X_CLOCK_DIVISOR_2,
|
|
(divisor >> 16) & 0xff);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = xr_set_reg_uart(port, XR21V141X_TX_CLOCK_MASK_0,
|
|
tx_mask & 0xff);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = xr_set_reg_uart(port, XR21V141X_TX_CLOCK_MASK_1,
|
|
(tx_mask >> 8) & 0xff);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = xr_set_reg_uart(port, XR21V141X_RX_CLOCK_MASK_0,
|
|
rx_mask & 0xff);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = xr_set_reg_uart(port, XR21V141X_RX_CLOCK_MASK_1,
|
|
(rx_mask >> 8) & 0xff);
|
|
if (ret)
|
|
return ret;
|
|
|
|
tty_encode_baud_rate(tty, baud, baud);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void xr_set_flow_mode(struct tty_struct *tty,
|
|
struct usb_serial_port *port,
|
|
struct ktermios *old_termios)
|
|
{
|
|
struct xr_data *data = usb_get_serial_port_data(port);
|
|
const struct xr_type *type = data->type;
|
|
u16 flow, gpio_mode;
|
|
int ret;
|
|
|
|
ret = xr_get_reg_uart(port, type->gpio_mode, &gpio_mode);
|
|
if (ret)
|
|
return;
|
|
|
|
/*
|
|
* According to the datasheets, the UART needs to be disabled while
|
|
* writing to the FLOW_CONTROL register (XR21V141X), or any register
|
|
* but GPIO_SET, GPIO_CLEAR, TX_BREAK and ERROR_STATUS (XR21B142X).
|
|
*/
|
|
xr_uart_disable(port);
|
|
|
|
/* Set GPIO mode for controlling the pins manually by default. */
|
|
gpio_mode &= ~XR_GPIO_MODE_SEL_MASK;
|
|
|
|
if (C_CRTSCTS(tty) && C_BAUD(tty) != B0) {
|
|
dev_dbg(&port->dev, "Enabling hardware flow ctrl\n");
|
|
gpio_mode |= XR_GPIO_MODE_SEL_RTS_CTS;
|
|
flow = XR_UART_FLOW_MODE_HW;
|
|
} else if (I_IXON(tty)) {
|
|
u8 start_char = START_CHAR(tty);
|
|
u8 stop_char = STOP_CHAR(tty);
|
|
|
|
dev_dbg(&port->dev, "Enabling sw flow ctrl\n");
|
|
flow = XR_UART_FLOW_MODE_SW;
|
|
|
|
xr_set_reg_uart(port, type->xon_char, start_char);
|
|
xr_set_reg_uart(port, type->xoff_char, stop_char);
|
|
} else {
|
|
dev_dbg(&port->dev, "Disabling flow ctrl\n");
|
|
flow = XR_UART_FLOW_MODE_NONE;
|
|
}
|
|
|
|
xr_set_reg_uart(port, type->flow_control, flow);
|
|
xr_set_reg_uart(port, type->gpio_mode, gpio_mode);
|
|
|
|
xr_uart_enable(port);
|
|
|
|
if (C_BAUD(tty) == B0)
|
|
xr_dtr_rts(port, 0);
|
|
else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
|
|
xr_dtr_rts(port, 1);
|
|
}
|
|
|
|
static void xr21v141x_set_line_settings(struct tty_struct *tty,
|
|
struct usb_serial_port *port, struct ktermios *old_termios)
|
|
{
|
|
struct ktermios *termios = &tty->termios;
|
|
u8 bits = 0;
|
|
int ret;
|
|
|
|
if (!old_termios || (tty->termios.c_ospeed != old_termios->c_ospeed))
|
|
xr21v141x_set_baudrate(tty, port);
|
|
|
|
switch (C_CSIZE(tty)) {
|
|
case CS5:
|
|
case CS6:
|
|
/* CS5 and CS6 are not supported, so just restore old setting */
|
|
termios->c_cflag &= ~CSIZE;
|
|
if (old_termios)
|
|
termios->c_cflag |= old_termios->c_cflag & CSIZE;
|
|
else
|
|
termios->c_cflag |= CS8;
|
|
|
|
if (C_CSIZE(tty) == CS7)
|
|
bits |= XR_UART_DATA_7;
|
|
else
|
|
bits |= XR_UART_DATA_8;
|
|
break;
|
|
case CS7:
|
|
bits |= XR_UART_DATA_7;
|
|
break;
|
|
case CS8:
|
|
default:
|
|
bits |= XR_UART_DATA_8;
|
|
break;
|
|
}
|
|
|
|
if (C_PARENB(tty)) {
|
|
if (C_CMSPAR(tty)) {
|
|
if (C_PARODD(tty))
|
|
bits |= XR_UART_PARITY_MARK;
|
|
else
|
|
bits |= XR_UART_PARITY_SPACE;
|
|
} else {
|
|
if (C_PARODD(tty))
|
|
bits |= XR_UART_PARITY_ODD;
|
|
else
|
|
bits |= XR_UART_PARITY_EVEN;
|
|
}
|
|
}
|
|
|
|
if (C_CSTOPB(tty))
|
|
bits |= XR_UART_STOP_2;
|
|
else
|
|
bits |= XR_UART_STOP_1;
|
|
|
|
ret = xr_set_reg_uart(port, XR21V141X_REG_FORMAT, bits);
|
|
if (ret)
|
|
return;
|
|
}
|
|
|
|
static void xr_cdc_set_line_coding(struct tty_struct *tty,
|
|
struct usb_serial_port *port, struct ktermios *old_termios)
|
|
{
|
|
struct xr_data *data = usb_get_serial_port_data(port);
|
|
struct usb_host_interface *alt = port->serial->interface->cur_altsetting;
|
|
struct usb_device *udev = port->serial->dev;
|
|
struct usb_cdc_line_coding *lc;
|
|
int ret;
|
|
|
|
lc = kzalloc(sizeof(*lc), GFP_KERNEL);
|
|
if (!lc)
|
|
return;
|
|
|
|
if (tty->termios.c_ospeed)
|
|
lc->dwDTERate = cpu_to_le32(tty->termios.c_ospeed);
|
|
else if (old_termios)
|
|
lc->dwDTERate = cpu_to_le32(old_termios->c_ospeed);
|
|
else
|
|
lc->dwDTERate = cpu_to_le32(9600);
|
|
|
|
if (C_CSTOPB(tty))
|
|
lc->bCharFormat = USB_CDC_2_STOP_BITS;
|
|
else
|
|
lc->bCharFormat = USB_CDC_1_STOP_BITS;
|
|
|
|
if (C_PARENB(tty)) {
|
|
if (C_CMSPAR(tty)) {
|
|
if (C_PARODD(tty))
|
|
lc->bParityType = USB_CDC_MARK_PARITY;
|
|
else
|
|
lc->bParityType = USB_CDC_SPACE_PARITY;
|
|
} else {
|
|
if (C_PARODD(tty))
|
|
lc->bParityType = USB_CDC_ODD_PARITY;
|
|
else
|
|
lc->bParityType = USB_CDC_EVEN_PARITY;
|
|
}
|
|
} else {
|
|
lc->bParityType = USB_CDC_NO_PARITY;
|
|
}
|
|
|
|
if (!data->type->have_5_6_bit_mode &&
|
|
(C_CSIZE(tty) == CS5 || C_CSIZE(tty) == CS6)) {
|
|
tty->termios.c_cflag &= ~CSIZE;
|
|
if (old_termios)
|
|
tty->termios.c_cflag |= old_termios->c_cflag & CSIZE;
|
|
else
|
|
tty->termios.c_cflag |= CS8;
|
|
}
|
|
|
|
switch (C_CSIZE(tty)) {
|
|
case CS5:
|
|
lc->bDataBits = 5;
|
|
break;
|
|
case CS6:
|
|
lc->bDataBits = 6;
|
|
break;
|
|
case CS7:
|
|
lc->bDataBits = 7;
|
|
break;
|
|
case CS8:
|
|
default:
|
|
lc->bDataBits = 8;
|
|
break;
|
|
}
|
|
|
|
ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
|
|
USB_CDC_REQ_SET_LINE_CODING,
|
|
USB_TYPE_CLASS | USB_RECIP_INTERFACE,
|
|
0, alt->desc.bInterfaceNumber,
|
|
lc, sizeof(*lc), USB_CTRL_SET_TIMEOUT);
|
|
if (ret < 0)
|
|
dev_err(&port->dev, "Failed to set line coding: %d\n", ret);
|
|
|
|
kfree(lc);
|
|
}
|
|
|
|
static void xr_set_termios(struct tty_struct *tty,
|
|
struct usb_serial_port *port, struct ktermios *old_termios)
|
|
{
|
|
struct xr_data *data = usb_get_serial_port_data(port);
|
|
|
|
/*
|
|
* XR21V141X does not have a CUSTOM_DRIVER flag and always enters CDC
|
|
* mode upon receiving CDC requests.
|
|
*/
|
|
if (data->type->set_line_settings)
|
|
data->type->set_line_settings(tty, port, old_termios);
|
|
else
|
|
xr_cdc_set_line_coding(tty, port, old_termios);
|
|
|
|
xr_set_flow_mode(tty, port, old_termios);
|
|
}
|
|
|
|
static int xr_open(struct tty_struct *tty, struct usb_serial_port *port)
|
|
{
|
|
int ret;
|
|
|
|
ret = xr_fifo_reset(port);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = xr_uart_enable(port);
|
|
if (ret) {
|
|
dev_err(&port->dev, "Failed to enable UART\n");
|
|
return ret;
|
|
}
|
|
|
|
/* Setup termios */
|
|
if (tty)
|
|
xr_set_termios(tty, port, NULL);
|
|
|
|
ret = usb_serial_generic_open(tty, port);
|
|
if (ret) {
|
|
xr_uart_disable(port);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void xr_close(struct usb_serial_port *port)
|
|
{
|
|
usb_serial_generic_close(port);
|
|
|
|
xr_uart_disable(port);
|
|
}
|
|
|
|
static int xr_probe(struct usb_serial *serial, const struct usb_device_id *id)
|
|
{
|
|
struct usb_interface *control = serial->interface;
|
|
struct usb_host_interface *alt = control->cur_altsetting;
|
|
struct usb_cdc_parsed_header hdrs;
|
|
struct usb_cdc_union_desc *desc;
|
|
struct usb_interface *data;
|
|
int ret;
|
|
|
|
ret = cdc_parse_cdc_header(&hdrs, control, alt->extra, alt->extralen);
|
|
if (ret < 0)
|
|
return -ENODEV;
|
|
|
|
desc = hdrs.usb_cdc_union_desc;
|
|
if (!desc)
|
|
return -ENODEV;
|
|
|
|
data = usb_ifnum_to_if(serial->dev, desc->bSlaveInterface0);
|
|
if (!data)
|
|
return -ENODEV;
|
|
|
|
ret = usb_serial_claim_interface(serial, data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
usb_set_serial_data(serial, (void *)id->driver_info);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int xr_gpio_init(struct usb_serial_port *port, const struct xr_type *type)
|
|
{
|
|
u16 mask, mode;
|
|
int ret;
|
|
|
|
/*
|
|
* Configure all pins as GPIO except for Receive and Transmit Toggle.
|
|
*/
|
|
mode = 0;
|
|
if (type->have_xmit_toggle)
|
|
mode |= XR_GPIO_MODE_RX_TOGGLE | XR_GPIO_MODE_TX_TOGGLE;
|
|
|
|
ret = xr_set_reg_uart(port, type->gpio_mode, mode);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* Configure DTR and RTS as outputs and make sure they are deasserted
|
|
* (active low), and configure RI, CD, DSR and CTS as inputs.
|
|
*/
|
|
mask = XR_GPIO_DTR | XR_GPIO_RTS;
|
|
ret = xr_set_reg_uart(port, type->gpio_direction, mask);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = xr_set_reg_uart(port, type->gpio_set, mask);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int xr_port_probe(struct usb_serial_port *port)
|
|
{
|
|
struct usb_interface_descriptor *desc;
|
|
const struct xr_type *type;
|
|
struct xr_data *data;
|
|
enum xr_type_id type_id;
|
|
int ret;
|
|
|
|
type_id = (int)(unsigned long)usb_get_serial_data(port->serial);
|
|
type = &xr_types[type_id];
|
|
|
|
data = kzalloc(sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
data->type = type;
|
|
|
|
desc = &port->serial->interface->cur_altsetting->desc;
|
|
if (type_id == XR21V141X)
|
|
data->channel = desc->bInterfaceNumber / 2;
|
|
else
|
|
data->channel = desc->bInterfaceNumber;
|
|
|
|
usb_set_serial_port_data(port, data);
|
|
|
|
if (type->custom_driver) {
|
|
ret = xr_set_reg_uart(port, type->custom_driver,
|
|
XR_CUSTOM_DRIVER_ACTIVE);
|
|
if (ret)
|
|
goto err_free;
|
|
}
|
|
|
|
ret = xr_gpio_init(port, type);
|
|
if (ret)
|
|
goto err_free;
|
|
|
|
return 0;
|
|
|
|
err_free:
|
|
kfree(data);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void xr_port_remove(struct usb_serial_port *port)
|
|
{
|
|
struct xr_data *data = usb_get_serial_port_data(port);
|
|
|
|
kfree(data);
|
|
}
|
|
|
|
#define XR_DEVICE(vid, pid, type) \
|
|
USB_DEVICE_INTERFACE_CLASS((vid), (pid), USB_CLASS_COMM), \
|
|
.driver_info = (type)
|
|
|
|
static const struct usb_device_id id_table[] = {
|
|
{ XR_DEVICE(0x04e2, 0x1400, XR2280X) },
|
|
{ XR_DEVICE(0x04e2, 0x1401, XR2280X) },
|
|
{ XR_DEVICE(0x04e2, 0x1402, XR2280X) },
|
|
{ XR_DEVICE(0x04e2, 0x1403, XR2280X) },
|
|
{ XR_DEVICE(0x04e2, 0x1410, XR21V141X) },
|
|
{ XR_DEVICE(0x04e2, 0x1411, XR21B1411) },
|
|
{ XR_DEVICE(0x04e2, 0x1412, XR21V141X) },
|
|
{ XR_DEVICE(0x04e2, 0x1414, XR21V141X) },
|
|
{ XR_DEVICE(0x04e2, 0x1420, XR21B142X) },
|
|
{ XR_DEVICE(0x04e2, 0x1422, XR21B142X) },
|
|
{ XR_DEVICE(0x04e2, 0x1424, XR21B142X) },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(usb, id_table);
|
|
|
|
static struct usb_serial_driver xr_device = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "xr_serial",
|
|
},
|
|
.id_table = id_table,
|
|
.num_ports = 1,
|
|
.probe = xr_probe,
|
|
.port_probe = xr_port_probe,
|
|
.port_remove = xr_port_remove,
|
|
.open = xr_open,
|
|
.close = xr_close,
|
|
.break_ctl = xr_break_ctl,
|
|
.set_termios = xr_set_termios,
|
|
.tiocmget = xr_tiocmget,
|
|
.tiocmset = xr_tiocmset,
|
|
.dtr_rts = xr_dtr_rts
|
|
};
|
|
|
|
static struct usb_serial_driver * const serial_drivers[] = {
|
|
&xr_device, NULL
|
|
};
|
|
|
|
module_usb_serial_driver(serial_drivers, id_table);
|
|
|
|
MODULE_AUTHOR("Manivannan Sadhasivam <mani@kernel.org>");
|
|
MODULE_DESCRIPTION("MaxLinear/Exar USB to Serial driver");
|
|
MODULE_LICENSE("GPL");
|