// SPDX-License-Identifier: GPL-2.0+ /* * MaxLinear/Exar USB to Serial driver * * Copyright (c) 2020 Manivannan Sadhasivam * Copyright (c) 2021 Johan Hovold * * Based on the initial driver written by Patong Yang: * * https://lore.kernel.org/r/20180404070634.nhspvmxcjwfgjkcv@advantechmxl-desktop * * Copyright (c) 2018 Patong Yang */ #include #include #include #include #include #include #include struct xr_txrx_clk_mask { u16 tx; u16 rx0; u16 rx1; }; #define XR_INT_OSC_HZ 48000000U #define XR21V141X_MIN_SPEED 46U #define XR21V141X_MAX_SPEED XR_INT_OSC_HZ /* XR21V141X register blocks */ #define XR21V141X_UART_REG_BLOCK 0 #define XR21V141X_UM_REG_BLOCK 4 #define XR21V141X_UART_CUSTOM_BLOCK 0x66 /* XR21V141X UART registers */ #define XR21V141X_CLOCK_DIVISOR_0 0x04 #define XR21V141X_CLOCK_DIVISOR_1 0x05 #define XR21V141X_CLOCK_DIVISOR_2 0x06 #define XR21V141X_TX_CLOCK_MASK_0 0x07 #define XR21V141X_TX_CLOCK_MASK_1 0x08 #define XR21V141X_RX_CLOCK_MASK_0 0x09 #define XR21V141X_RX_CLOCK_MASK_1 0x0a #define XR21V141X_REG_FORMAT 0x0b /* XR21V141X UART Manager registers */ #define XR21V141X_UM_FIFO_ENABLE_REG 0x10 #define XR21V141X_UM_ENABLE_TX_FIFO 0x01 #define XR21V141X_UM_ENABLE_RX_FIFO 0x02 #define XR21V141X_UM_RX_FIFO_RESET 0x18 #define XR21V141X_UM_TX_FIFO_RESET 0x1c #define XR_UART_ENABLE_TX 0x1 #define XR_UART_ENABLE_RX 0x2 #define XR_GPIO_RI BIT(0) #define XR_GPIO_CD BIT(1) #define XR_GPIO_DSR BIT(2) #define XR_GPIO_DTR BIT(3) #define XR_GPIO_CTS BIT(4) #define XR_GPIO_RTS BIT(5) #define XR_GPIO_CLK BIT(6) #define XR_GPIO_XEN BIT(7) #define XR_GPIO_TXT BIT(8) #define XR_GPIO_RXT BIT(9) #define XR_UART_DATA_MASK GENMASK(3, 0) #define XR_UART_DATA_7 0x7 #define XR_UART_DATA_8 0x8 #define XR_UART_PARITY_MASK GENMASK(6, 4) #define XR_UART_PARITY_SHIFT 4 #define XR_UART_PARITY_NONE (0x0 << XR_UART_PARITY_SHIFT) #define XR_UART_PARITY_ODD (0x1 << XR_UART_PARITY_SHIFT) #define XR_UART_PARITY_EVEN (0x2 << XR_UART_PARITY_SHIFT) #define XR_UART_PARITY_MARK (0x3 << XR_UART_PARITY_SHIFT) #define XR_UART_PARITY_SPACE (0x4 << XR_UART_PARITY_SHIFT) #define XR_UART_STOP_MASK BIT(7) #define XR_UART_STOP_SHIFT 7 #define XR_UART_STOP_1 (0x0 << XR_UART_STOP_SHIFT) #define XR_UART_STOP_2 (0x1 << XR_UART_STOP_SHIFT) #define XR_UART_FLOW_MODE_NONE 0x0 #define XR_UART_FLOW_MODE_HW 0x1 #define XR_UART_FLOW_MODE_SW 0x2 #define XR_GPIO_MODE_SEL_MASK GENMASK(2, 0) #define XR_GPIO_MODE_SEL_RTS_CTS 0x1 #define XR_GPIO_MODE_SEL_DTR_DSR 0x2 #define XR_GPIO_MODE_SEL_RS485 0x3 #define XR_GPIO_MODE_SEL_RS485_ADDR 0x4 #define XR_GPIO_MODE_RS485_TX_H 0x8 #define XR_GPIO_MODE_TX_TOGGLE 0x100 #define XR_GPIO_MODE_RX_TOGGLE 0x200 #define XR_FIFO_RESET 0x1 #define XR_CUSTOM_DRIVER_ACTIVE 0x1 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 { int reg_width; u8 reg_recipient; u8 set_reg; u8 get_reg; u16 uart_enable; u16 flow_control; u16 xon_char; u16 xoff_char; u16 tx_break; u16 gpio_mode; u16 gpio_direction; u16 gpio_set; u16 gpio_clear; u16 gpio_status; u16 tx_fifo_reset; u16 rx_fifo_reset; u16 custom_driver; bool have_5_6_bit_mode; bool have_xmit_toggle; int (*enable)(struct usb_serial_port *port); int (*disable)(struct usb_serial_port *port); int (*fifo_reset)(struct usb_serial_port *port); void (*set_line_settings)(struct tty_struct *tty, struct usb_serial_port *port, const struct ktermios *old_termios); }; enum xr_type_id { XR21V141X, XR21B142X, XR21B1411, XR2280X, XR_TYPE_COUNT, }; static const struct xr_type xr_types[] = { [XR21V141X] = { .reg_width = 8, .reg_recipient = USB_RECIP_DEVICE, .set_reg = 0x00, .get_reg = 0x01, .uart_enable = 0x03, .flow_control = 0x0c, .xon_char = 0x10, .xoff_char = 0x11, .tx_break = 0x14, .gpio_mode = 0x1a, .gpio_direction = 0x1b, .gpio_set = 0x1d, .gpio_clear = 0x1e, .gpio_status = 0x1f, .enable = xr21v141x_uart_enable, .disable = xr21v141x_uart_disable, .fifo_reset = xr21v141x_fifo_reset, .set_line_settings = xr21v141x_set_line_settings, }, [XR21B142X] = { .reg_width = 16, .reg_recipient = USB_RECIP_INTERFACE, .set_reg = 0x00, .get_reg = 0x00, .uart_enable = 0x00, .flow_control = 0x06, .xon_char = 0x07, .xoff_char = 0x08, .tx_break = 0x0a, .gpio_mode = 0x0c, .gpio_direction = 0x0d, .gpio_set = 0x0e, .gpio_clear = 0x0f, .gpio_status = 0x10, .tx_fifo_reset = 0x40, .rx_fifo_reset = 0x43, .custom_driver = 0x60, .have_5_6_bit_mode = true, .have_xmit_toggle = true, }, [XR21B1411] = { .reg_width = 12, .reg_recipient = USB_RECIP_DEVICE, .set_reg = 0x00, .get_reg = 0x01, .uart_enable = 0xc00, .flow_control = 0xc06, .xon_char = 0xc07, .xoff_char = 0xc08, .tx_break = 0xc0a, .gpio_mode = 0xc0c, .gpio_direction = 0xc0d, .gpio_set = 0xc0e, .gpio_clear = 0xc0f, .gpio_status = 0xc10, .tx_fifo_reset = 0xc80, .rx_fifo_reset = 0xcc0, .custom_driver = 0x20d, }, [XR2280X] = { .reg_width = 16, .reg_recipient = USB_RECIP_DEVICE, .set_reg = 0x05, .get_reg = 0x05, .uart_enable = 0x40, .flow_control = 0x46, .xon_char = 0x47, .xoff_char = 0x48, .tx_break = 0x4a, .gpio_mode = 0x4c, .gpio_direction = 0x4d, .gpio_set = 0x4e, .gpio_clear = 0x4f, .gpio_status = 0x50, .tx_fifo_reset = 0x60, .rx_fifo_reset = 0x63, .custom_driver = 0x81, }, }; struct xr_data { const struct xr_type *type; u8 channel; /* zero-based index or interface number */ struct serial_rs485 rs485; }; static int xr_set_reg(struct usb_serial_port *port, u8 channel, u16 reg, u16 val) { struct xr_data *data = usb_get_serial_port_data(port); const struct xr_type *type = data->type; struct usb_serial *serial = port->serial; int ret; ret = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), type->set_reg, USB_DIR_OUT | USB_TYPE_VENDOR | type->reg_recipient, val, (channel << 8) | reg, NULL, 0, USB_CTRL_SET_TIMEOUT); if (ret < 0) { dev_err(&port->dev, "Failed to set reg 0x%02x: %d\n", reg, ret); return ret; } return 0; } static int xr_get_reg(struct usb_serial_port *port, u8 channel, u16 reg, u16 *val) { struct xr_data *data = usb_get_serial_port_data(port); const struct xr_type *type = data->type; struct usb_serial *serial = port->serial; u8 *dmabuf; int ret, len; if (type->reg_width == 8) len = 1; else len = 2; dmabuf = kmalloc(len, GFP_KERNEL); if (!dmabuf) return -ENOMEM; ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), type->get_reg, USB_DIR_IN | USB_TYPE_VENDOR | type->reg_recipient, 0, (channel << 8) | reg, dmabuf, len, USB_CTRL_GET_TIMEOUT); if (ret == len) { if (len == 2) *val = le16_to_cpup((__le16 *)dmabuf); else *val = *dmabuf; ret = 0; } else { dev_err(&port->dev, "Failed to get reg 0x%02x: %d\n", reg, ret); if (ret >= 0) ret = -EIO; } kfree(dmabuf); return ret; } static int xr_set_reg_uart(struct usb_serial_port *port, u16 reg, u16 val) { struct xr_data *data = usb_get_serial_port_data(port); return xr_set_reg(port, data->channel, reg, val); } static int xr_get_reg_uart(struct usb_serial_port *port, u16 reg, u16 *val) { struct xr_data *data = usb_get_serial_port_data(port); return xr_get_reg(port, data->channel, reg, val); } static int xr_set_reg_um(struct usb_serial_port *port, u8 reg_base, u8 val) { struct xr_data *data = usb_get_serial_port_data(port); u8 reg; reg = reg_base + data->channel; return xr_set_reg(port, XR21V141X_UM_REG_BLOCK, reg, val); } static int __xr_uart_enable(struct usb_serial_port *port) { struct xr_data *data = usb_get_serial_port_data(port); return xr_set_reg_uart(port, data->type->uart_enable, XR_UART_ENABLE_TX | XR_UART_ENABLE_RX); } static int __xr_uart_disable(struct usb_serial_port *port) { struct xr_data *data = usb_get_serial_port_data(port); return xr_set_reg_uart(port, data->type->uart_enable, 0); } /* * 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) { int ret; ret = xr_set_reg_um(port, XR21V141X_UM_FIFO_ENABLE_REG, XR21V141X_UM_ENABLE_TX_FIFO); if (ret) return ret; ret = __xr_uart_enable(port); if (ret) return ret; ret = xr_set_reg_um(port, XR21V141X_UM_FIFO_ENABLE_REG, XR21V141X_UM_ENABLE_TX_FIFO | XR21V141X_UM_ENABLE_RX_FIFO); if (ret) __xr_uart_disable(port); return ret; } static int xr21v141x_uart_disable(struct usb_serial_port *port) { int ret; ret = __xr_uart_disable(port); if (ret) return ret; ret = xr_set_reg_um(port, XR21V141X_UM_FIFO_ENABLE_REG, 0); return ret; } static int xr_uart_enable(struct usb_serial_port *port) { struct xr_data *data = usb_get_serial_port_data(port); if (data->type->enable) return data->type->enable(port); return __xr_uart_enable(port); } static int xr_uart_disable(struct usb_serial_port *port) { struct xr_data *data = usb_get_serial_port_data(port); if (data->type->disable) return data->type->disable(port); return __xr_uart_disable(port); } static int xr21v141x_fifo_reset(struct usb_serial_port *port) { int ret; ret = xr_set_reg_um(port, XR21V141X_UM_TX_FIFO_RESET, XR_FIFO_RESET); if (ret) return ret; ret = xr_set_reg_um(port, XR21V141X_UM_RX_FIFO_RESET, XR_FIFO_RESET); if (ret) return ret; return 0; } static int xr_fifo_reset(struct usb_serial_port *port) { struct xr_data *data = usb_get_serial_port_data(port); int ret; if (data->type->fifo_reset) return data->type->fifo_reset(port); ret = xr_set_reg_uart(port, data->type->tx_fifo_reset, XR_FIFO_RESET); if (ret) return ret; ret = xr_set_reg_uart(port, data->type->rx_fifo_reset, XR_FIFO_RESET); if (ret) return ret; return 0; } static int xr_tiocmget(struct tty_struct *tty) { struct usb_serial_port *port = tty->driver_data; struct xr_data *data = usb_get_serial_port_data(port); u16 status; int ret; ret = xr_get_reg_uart(port, data->type->gpio_status, &status); if (ret) return ret; /* * Modem control pins are active low, so reading '0' means it is active * and '1' means not active. */ ret = ((status & XR_GPIO_DTR) ? 0 : TIOCM_DTR) | ((status & XR_GPIO_RTS) ? 0 : TIOCM_RTS) | ((status & XR_GPIO_CTS) ? 0 : TIOCM_CTS) | ((status & XR_GPIO_DSR) ? 0 : TIOCM_DSR) | ((status & XR_GPIO_RI) ? 0 : TIOCM_RI) | ((status & XR_GPIO_CD) ? 0 : TIOCM_CD); return ret; } static int xr_tiocmset_port(struct usb_serial_port *port, unsigned int set, unsigned int clear) { struct xr_data *data = usb_get_serial_port_data(port); const struct xr_type *type = data->type; u16 gpio_set = 0; u16 gpio_clr = 0; int ret = 0; /* Modem control pins are active low, so set & clr are swapped */ if (set & TIOCM_RTS) gpio_clr |= XR_GPIO_RTS; if (set & TIOCM_DTR) gpio_clr |= XR_GPIO_DTR; if (clear & TIOCM_RTS) gpio_set |= XR_GPIO_RTS; if (clear & TIOCM_DTR) gpio_set |= XR_GPIO_DTR; /* Writing '0' to gpio_{set/clr} bits has no effect, so no need to do */ 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 int 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"); return 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, const 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; bool rs485_enabled; 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; rs485_enabled = !!(data->rs485.flags & SER_RS485_ENABLED); if (rs485_enabled) { dev_dbg(&port->dev, "Enabling RS-485\n"); gpio_mode |= XR_GPIO_MODE_SEL_RS485; if (data->rs485.flags & SER_RS485_RTS_ON_SEND) gpio_mode &= ~XR_GPIO_MODE_RS485_TX_H; else gpio_mode |= XR_GPIO_MODE_RS485_TX_H; } if (C_CRTSCTS(tty) && C_BAUD(tty) != B0 && !rs485_enabled) { 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, const 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, const 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 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_sanitize_serial_rs485(struct serial_rs485 *rs485) { if (!(rs485->flags & SER_RS485_ENABLED)) { memset(rs485, 0, sizeof(*rs485)); return; } /* RTS always toggles after TX */ if (rs485->flags & SER_RS485_RTS_ON_SEND) rs485->flags &= ~SER_RS485_RTS_AFTER_SEND; else rs485->flags |= SER_RS485_RTS_AFTER_SEND; /* Only the flags are implemented at the moment */ rs485->flags &= SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | SER_RS485_RTS_AFTER_SEND; rs485->delay_rts_before_send = 0; rs485->delay_rts_after_send = 0; memset(rs485->padding, 0, sizeof(rs485->padding)); } static int xr_get_rs485_config(struct tty_struct *tty, struct serial_rs485 __user *argp) { struct usb_serial_port *port = tty->driver_data; struct xr_data *data = usb_get_serial_port_data(port); down_read(&tty->termios_rwsem); if (copy_to_user(argp, &data->rs485, sizeof(data->rs485))) { up_read(&tty->termios_rwsem); return -EFAULT; } up_read(&tty->termios_rwsem); return 0; } static int xr_set_rs485_config(struct tty_struct *tty, struct serial_rs485 __user *argp) { struct usb_serial_port *port = tty->driver_data; struct xr_data *data = usb_get_serial_port_data(port); struct serial_rs485 rs485; if (copy_from_user(&rs485, argp, sizeof(rs485))) return -EFAULT; xr_sanitize_serial_rs485(&rs485); down_write(&tty->termios_rwsem); data->rs485 = rs485; xr_set_flow_mode(tty, port, NULL); up_write(&tty->termios_rwsem); if (copy_to_user(argp, &rs485, sizeof(rs485))) return -EFAULT; return 0; } static int xr_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) { void __user *argp = (void __user *)arg; switch (cmd) { case TIOCGRS485: return xr_get_rs485_config(tty, argp); case TIOCSRS485: return xr_set_rs485_config(tty, argp); } return -ENOIOCTLCMD; } static void xr_set_termios(struct tty_struct *tty, struct usb_serial_port *port, const 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 = { .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, .ioctl = xr_ioctl, .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 "); MODULE_DESCRIPTION("MaxLinear/Exar USB to Serial driver"); MODULE_LICENSE("GPL");