From 0c9bd6004d258d465a69c7612fa8c80d83f7865b Mon Sep 17 00:00:00 2001 From: "Ji-Ze Hong (Peter Hong)" Date: Mon, 14 Nov 2016 13:37:59 +0800 Subject: [PATCH] USB: serial: add Fintek F81532/534 driver This driver is for Fintek F81532/F81534 USB to Serial Ports IC. F81532 spec: https://drive.google.com/file/d/0B8vRwwYO7aMFOTRRMmhWQVNvajQ/view?usp= sharing F81534 spec: https://drive.google.com/file/d/0B8vRwwYO7aMFV29pQWJqbVBNc00/view?usp= sharing Features: 1. F81532 is 1-to-2 & F81534 is 1-to-4 serial ports IC 2. Support Baudrate from B50 to B115200. Signed-off-by: Ji-Ze Hong (Peter Hong) Signed-off-by: Johan Hovold --- drivers/usb/serial/Kconfig | 10 + drivers/usb/serial/Makefile | 1 + drivers/usb/serial/f81534.c | 1409 +++++++++++++++++++++++++++++++++++ 3 files changed, 1420 insertions(+) create mode 100644 drivers/usb/serial/f81534.c diff --git a/drivers/usb/serial/Kconfig b/drivers/usb/serial/Kconfig index 56ecb8b5115d..d9bc8dafe000 100644 --- a/drivers/usb/serial/Kconfig +++ b/drivers/usb/serial/Kconfig @@ -255,6 +255,16 @@ config USB_SERIAL_F81232 To compile this driver as a module, choose M here: the module will be called f81232. +config USB_SERIAL_F8153X + tristate "USB Fintek F81532/534 Multi-Ports Serial Driver" + help + Say Y here if you want to use the Fintek F81532/534 Multi-Ports + USB to serial adapter. + + To compile this driver as a module, choose M here: the + module will be called f81534. + + config USB_SERIAL_GARMIN tristate "USB Garmin GPS driver" help diff --git a/drivers/usb/serial/Makefile b/drivers/usb/serial/Makefile index 349d9df0895f..9e43b7b002eb 100644 --- a/drivers/usb/serial/Makefile +++ b/drivers/usb/serial/Makefile @@ -23,6 +23,7 @@ obj-$(CONFIG_USB_SERIAL_EDGEPORT) += io_edgeport.o obj-$(CONFIG_USB_SERIAL_EDGEPORT_TI) += io_ti.o obj-$(CONFIG_USB_SERIAL_EMPEG) += empeg.o obj-$(CONFIG_USB_SERIAL_F81232) += f81232.o +obj-$(CONFIG_USB_SERIAL_F8153X) += f81534.o obj-$(CONFIG_USB_SERIAL_FTDI_SIO) += ftdi_sio.o obj-$(CONFIG_USB_SERIAL_GARMIN) += garmin_gps.o obj-$(CONFIG_USB_SERIAL_IPAQ) += ipaq.o diff --git a/drivers/usb/serial/f81534.c b/drivers/usb/serial/f81534.c new file mode 100644 index 000000000000..8282a6a18fee --- /dev/null +++ b/drivers/usb/serial/f81534.c @@ -0,0 +1,1409 @@ +/* + * F81532/F81534 USB to Serial Ports Bridge + * + * F81532 => 2 Serial Ports + * F81534 => 4 Serial Ports + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * Copyright (C) 2016 Feature Integration Technology Inc., (Fintek) + * Copyright (C) 2016 Tom Tsai (Tom_Tsai@fintek.com.tw) + * Copyright (C) 2016 Peter Hong (Peter_Hong@fintek.com.tw) + * + * The F81532/F81534 had 1 control endpoint for setting, 1 endpoint bulk-out + * for all serial port TX and 1 endpoint bulk-in for all serial port read in + * (Read Data/MSR/LSR). + * + * Write URB is fixed with 512bytes, per serial port used 128Bytes. + * It can be described by f81534_prepare_write_buffer() + * + * Read URB is 512Bytes max, per serial port used 128Bytes. + * It can be described by f81534_process_read_urb() and maybe received with + * 128x1,2,3,4 bytes. + * + */ +#include +#include +#include +#include +#include +#include +#include +#include + +/* Serial Port register Address */ +#define F81534_UART_BASE_ADDRESS 0x1200 +#define F81534_UART_OFFSET 0x10 +#define F81534_DIVISOR_LSB_REG (0x00 + F81534_UART_BASE_ADDRESS) +#define F81534_DIVISOR_MSB_REG (0x01 + F81534_UART_BASE_ADDRESS) +#define F81534_FIFO_CONTROL_REG (0x02 + F81534_UART_BASE_ADDRESS) +#define F81534_LINE_CONTROL_REG (0x03 + F81534_UART_BASE_ADDRESS) +#define F81534_MODEM_CONTROL_REG (0x04 + F81534_UART_BASE_ADDRESS) +#define F81534_MODEM_STATUS_REG (0x06 + F81534_UART_BASE_ADDRESS) +#define F81534_CONFIG1_REG (0x09 + F81534_UART_BASE_ADDRESS) + +#define F81534_DEF_CONF_ADDRESS_START 0x3000 +#define F81534_DEF_CONF_SIZE 8 + +#define F81534_CUSTOM_ADDRESS_START 0x2f00 +#define F81534_CUSTOM_DATA_SIZE 0x10 +#define F81534_CUSTOM_NO_CUSTOM_DATA 0xff +#define F81534_CUSTOM_VALID_TOKEN 0xf0 +#define F81534_CONF_OFFSET 1 + +#define F81534_MAX_DATA_BLOCK 64 +#define F81534_MAX_BUS_RETRY 20 + +/* Default URB timeout for USB operations */ +#define F81534_USB_MAX_RETRY 10 +#define F81534_USB_TIMEOUT 1000 +#define F81534_SET_GET_REGISTER 0xA0 + +#define F81534_NUM_PORT 4 +#define F81534_UNUSED_PORT 0xff +#define F81534_WRITE_BUFFER_SIZE 512 + +#define DRIVER_DESC "Fintek F81532/F81534" +#define FINTEK_VENDOR_ID_1 0x1934 +#define FINTEK_VENDOR_ID_2 0x2C42 +#define FINTEK_DEVICE_ID 0x1202 +#define F81534_MAX_TX_SIZE 124 +#define F81534_MAX_RX_SIZE 124 +#define F81534_RECEIVE_BLOCK_SIZE 128 +#define F81534_MAX_RECEIVE_BLOCK_SIZE 512 + +#define F81534_TOKEN_RECEIVE 0x01 +#define F81534_TOKEN_WRITE 0x02 +#define F81534_TOKEN_TX_EMPTY 0x03 +#define F81534_TOKEN_MSR_CHANGE 0x04 + +/* + * We used interal SPI bus to access FLASH section. We must wait the SPI bus to + * idle if we performed any command. + * + * SPI Bus status register: F81534_BUS_REG_STATUS + * Bit 0/1 : BUSY + * Bit 2 : IDLE + */ +#define F81534_BUS_BUSY (BIT(0) | BIT(1)) +#define F81534_BUS_IDLE BIT(2) +#define F81534_BUS_READ_DATA 0x1004 +#define F81534_BUS_REG_STATUS 0x1003 +#define F81534_BUS_REG_START 0x1002 +#define F81534_BUS_REG_END 0x1001 + +#define F81534_CMD_READ 0x03 + +#define F81534_DEFAULT_BAUD_RATE 9600 +#define F81534_MAX_BAUDRATE 115200 + +#define F81534_PORT_CONF_DISABLE_PORT BIT(3) +#define F81534_PORT_CONF_NOT_EXIST_PORT BIT(7) +#define F81534_PORT_UNAVAILABLE \ + (F81534_PORT_CONF_DISABLE_PORT | F81534_PORT_CONF_NOT_EXIST_PORT) + +#define F81534_1X_RXTRIGGER 0xc3 +#define F81534_8X_RXTRIGGER 0xcf + +static const struct usb_device_id f81534_id_table[] = { + { USB_DEVICE(FINTEK_VENDOR_ID_1, FINTEK_DEVICE_ID) }, + { USB_DEVICE(FINTEK_VENDOR_ID_2, FINTEK_DEVICE_ID) }, + {} /* Terminating entry */ +}; + +#define F81534_TX_EMPTY_BIT 0 + +struct f81534_serial_private { + u8 conf_data[F81534_DEF_CONF_SIZE]; + int tty_idx[F81534_NUM_PORT]; + u8 setting_idx; + int opened_port; + struct mutex urb_mutex; +}; + +struct f81534_port_private { + struct mutex mcr_mutex; + unsigned long tx_empty; + spinlock_t msr_lock; + u8 shadow_mcr; + u8 shadow_msr; + u8 phy_num; +}; + +static int f81534_logic_to_phy_port(struct usb_serial *serial, + struct usb_serial_port *port) +{ + struct f81534_serial_private *serial_priv = + usb_get_serial_data(port->serial); + int count = 0; + int i; + + for (i = 0; i < F81534_NUM_PORT; ++i) { + if (serial_priv->conf_data[i] & F81534_PORT_UNAVAILABLE) + continue; + + if (port->port_number == count) + return i; + + ++count; + } + + return -ENODEV; +} + +static int f81534_set_register(struct usb_serial *serial, u16 reg, u8 data) +{ + struct usb_interface *interface = serial->interface; + struct usb_device *dev = serial->dev; + size_t count = F81534_USB_MAX_RETRY; + int status; + u8 *tmp; + + tmp = kmalloc(sizeof(u8), GFP_KERNEL); + if (!tmp) + return -ENOMEM; + + *tmp = data; + + /* + * Our device maybe not reply when heavily loading, We'll retry for + * F81534_USB_MAX_RETRY times. + */ + while (count--) { + status = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), + F81534_SET_GET_REGISTER, + USB_TYPE_VENDOR | USB_DIR_OUT, + reg, 0, tmp, sizeof(u8), + F81534_USB_TIMEOUT); + if (status > 0) { + status = 0; + break; + } else if (status == 0) { + status = -EIO; + } + } + + if (status < 0) { + dev_err(&interface->dev, "%s: reg: %x data: %x failed: %d\n", + __func__, reg, data, status); + } + + kfree(tmp); + return status; +} + +static int f81534_get_register(struct usb_serial *serial, u16 reg, u8 *data) +{ + struct usb_interface *interface = serial->interface; + struct usb_device *dev = serial->dev; + size_t count = F81534_USB_MAX_RETRY; + int status; + u8 *tmp; + + tmp = kmalloc(sizeof(u8), GFP_KERNEL); + if (!tmp) + return -ENOMEM; + + /* + * Our device maybe not reply when heavily loading, We'll retry for + * F81534_USB_MAX_RETRY times. + */ + while (count--) { + status = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), + F81534_SET_GET_REGISTER, + USB_TYPE_VENDOR | USB_DIR_IN, + reg, 0, tmp, sizeof(u8), + F81534_USB_TIMEOUT); + if (status > 0) { + status = 0; + break; + } else if (status == 0) { + status = -EIO; + } + } + + if (status < 0) { + dev_err(&interface->dev, "%s: reg: %x failed: %d\n", __func__, + reg, status); + goto end; + } + + *data = *tmp; + +end: + kfree(tmp); + return status; +} + +static int f81534_set_port_register(struct usb_serial_port *port, u16 reg, + u8 data) +{ + struct f81534_port_private *port_priv = usb_get_serial_port_data(port); + + return f81534_set_register(port->serial, + reg + port_priv->phy_num * F81534_UART_OFFSET, data); +} + +static int f81534_get_port_register(struct usb_serial_port *port, u16 reg, + u8 *data) +{ + struct f81534_port_private *port_priv = usb_get_serial_port_data(port); + + return f81534_get_register(port->serial, + reg + port_priv->phy_num * F81534_UART_OFFSET, data); +} + +/* + * If we try to access the internal flash via SPI bus, we should check the bus + * status for every command. e.g., F81534_BUS_REG_START/F81534_BUS_REG_END + */ +static int f81534_wait_for_spi_idle(struct usb_serial *serial) +{ + size_t count = F81534_MAX_BUS_RETRY; + u8 tmp; + int status; + + do { + status = f81534_get_register(serial, F81534_BUS_REG_STATUS, + &tmp); + if (status) + return status; + + if (tmp & F81534_BUS_BUSY) + continue; + + if (tmp & F81534_BUS_IDLE) + break; + + } while (--count); + + if (!count) { + dev_err(&serial->interface->dev, + "%s: timed out waiting for idle SPI bus\n", + __func__); + return -EIO; + } + + return f81534_set_register(serial, F81534_BUS_REG_STATUS, + tmp & ~F81534_BUS_IDLE); +} + +static int f81534_get_spi_register(struct usb_serial *serial, u16 reg, + u8 *data) +{ + int status; + + status = f81534_get_register(serial, reg, data); + if (status) + return status; + + return f81534_wait_for_spi_idle(serial); +} + +static int f81534_set_spi_register(struct usb_serial *serial, u16 reg, u8 data) +{ + int status; + + status = f81534_set_register(serial, reg, data); + if (status) + return status; + + return f81534_wait_for_spi_idle(serial); +} + +static int f81534_read_flash(struct usb_serial *serial, u32 address, + size_t size, u8 *buf) +{ + u8 tmp_buf[F81534_MAX_DATA_BLOCK]; + size_t block = 0; + size_t read_size; + size_t count; + int status; + int offset; + u16 reg_tmp; + + status = f81534_set_spi_register(serial, F81534_BUS_REG_START, + F81534_CMD_READ); + if (status) + return status; + + status = f81534_set_spi_register(serial, F81534_BUS_REG_START, + (address >> 16) & 0xff); + if (status) + return status; + + status = f81534_set_spi_register(serial, F81534_BUS_REG_START, + (address >> 8) & 0xff); + if (status) + return status; + + status = f81534_set_spi_register(serial, F81534_BUS_REG_START, + (address >> 0) & 0xff); + if (status) + return status; + + /* Continuous read mode */ + do { + read_size = min_t(size_t, F81534_MAX_DATA_BLOCK, size); + + for (count = 0; count < read_size; ++count) { + /* To write F81534_BUS_REG_END when final byte */ + if (size <= F81534_MAX_DATA_BLOCK && + read_size == count + 1) + reg_tmp = F81534_BUS_REG_END; + else + reg_tmp = F81534_BUS_REG_START; + + /* + * Dummy code, force IC to generate a read pulse, the + * set of value 0xf1 is dont care (any value is ok) + */ + status = f81534_set_spi_register(serial, reg_tmp, + 0xf1); + if (status) + return status; + + status = f81534_get_spi_register(serial, + F81534_BUS_READ_DATA, + &tmp_buf[count]); + if (status) + return status; + + offset = count + block * F81534_MAX_DATA_BLOCK; + buf[offset] = tmp_buf[count]; + } + + size -= read_size; + ++block; + } while (size); + + return 0; +} + +static void f81534_prepare_write_buffer(struct usb_serial_port *port, u8 *buf) +{ + struct f81534_port_private *port_priv = usb_get_serial_port_data(port); + int phy_num = port_priv->phy_num; + u8 tx_len; + int i; + + /* + * The block layout is fixed with 4x128 Bytes, per 128 Bytes a port. + * index 0: port phy idx (e.g., 0,1,2,3) + * index 1: only F81534_TOKEN_WRITE + * index 2: serial TX out length + * index 3: fix to 0 + * index 4~127: serial out data block + */ + for (i = 0; i < F81534_NUM_PORT; ++i) { + buf[i * F81534_RECEIVE_BLOCK_SIZE] = i; + buf[i * F81534_RECEIVE_BLOCK_SIZE + 1] = F81534_TOKEN_WRITE; + buf[i * F81534_RECEIVE_BLOCK_SIZE + 2] = 0; + buf[i * F81534_RECEIVE_BLOCK_SIZE + 3] = 0; + } + + tx_len = kfifo_out_locked(&port->write_fifo, + &buf[phy_num * F81534_RECEIVE_BLOCK_SIZE + 4], + F81534_MAX_TX_SIZE, &port->lock); + + buf[phy_num * F81534_RECEIVE_BLOCK_SIZE + 2] = tx_len; +} + +static int f81534_submit_writer(struct usb_serial_port *port, gfp_t mem_flags) +{ + struct f81534_port_private *port_priv = usb_get_serial_port_data(port); + struct urb *urb; + unsigned long flags; + int result; + + /* Check is any data in write_fifo */ + spin_lock_irqsave(&port->lock, flags); + + if (kfifo_is_empty(&port->write_fifo)) { + spin_unlock_irqrestore(&port->lock, flags); + return 0; + } + + spin_unlock_irqrestore(&port->lock, flags); + + /* Check H/W is TXEMPTY */ + if (!test_and_clear_bit(F81534_TX_EMPTY_BIT, &port_priv->tx_empty)) + return 0; + + urb = port->write_urbs[0]; + f81534_prepare_write_buffer(port, port->bulk_out_buffers[0]); + urb->transfer_buffer_length = F81534_WRITE_BUFFER_SIZE; + + result = usb_submit_urb(urb, mem_flags); + if (result) { + set_bit(F81534_TX_EMPTY_BIT, &port_priv->tx_empty); + dev_err(&port->dev, "%s: submit failed: %d\n", __func__, + result); + return result; + } + + usb_serial_port_softint(port); + return 0; +} + +static u32 f81534_calc_baud_divisor(u32 baudrate, u32 clockrate) +{ + if (!baudrate) + return 0; + + /* Round to nearest divisor */ + return DIV_ROUND_CLOSEST(clockrate, baudrate); +} + +static int f81534_set_port_config(struct usb_serial_port *port, u32 baudrate, + u8 lcr) +{ + u32 divisor; + int status; + u8 value; + + if (baudrate <= 1200) + value = F81534_1X_RXTRIGGER; /* 128 FIFO & TL: 1x */ + else + value = F81534_8X_RXTRIGGER; /* 128 FIFO & TL: 8x */ + + status = f81534_set_port_register(port, F81534_CONFIG1_REG, value); + if (status) { + dev_err(&port->dev, "%s: CONFIG1 setting failed\n", __func__); + return status; + } + + if (baudrate <= 1200) + value = UART_FCR_TRIGGER_1 | UART_FCR_ENABLE_FIFO; /* TL: 1 */ + else + value = UART_FCR_R_TRIG_11 | UART_FCR_ENABLE_FIFO; /* TL: 14 */ + + status = f81534_set_port_register(port, F81534_FIFO_CONTROL_REG, + value); + if (status) { + dev_err(&port->dev, "%s: FCR setting failed\n", __func__); + return status; + } + + divisor = f81534_calc_baud_divisor(baudrate, F81534_MAX_BAUDRATE); + value = UART_LCR_DLAB; + status = f81534_set_port_register(port, F81534_LINE_CONTROL_REG, + value); + if (status) { + dev_err(&port->dev, "%s: set LCR failed\n", __func__); + return status; + } + + value = divisor & 0xff; + status = f81534_set_port_register(port, F81534_DIVISOR_LSB_REG, value); + if (status) { + dev_err(&port->dev, "%s: set DLAB LSB failed\n", __func__); + return status; + } + + value = (divisor >> 8) & 0xff; + status = f81534_set_port_register(port, F81534_DIVISOR_MSB_REG, value); + if (status) { + dev_err(&port->dev, "%s: set DLAB MSB failed\n", __func__); + return status; + } + + status = f81534_set_port_register(port, F81534_LINE_CONTROL_REG, lcr); + if (status) { + dev_err(&port->dev, "%s: set LCR failed\n", __func__); + return status; + } + + return 0; +} + +static int f81534_update_mctrl(struct usb_serial_port *port, unsigned int set, + unsigned int clear) +{ + struct f81534_port_private *port_priv = usb_get_serial_port_data(port); + int status; + u8 tmp; + + if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) + return 0; /* no change */ + + mutex_lock(&port_priv->mcr_mutex); + + /* 'Set' takes precedence over 'Clear' */ + clear &= ~set; + + /* Always enable UART_MCR_OUT2 */ + tmp = UART_MCR_OUT2 | port_priv->shadow_mcr; + + if (clear & TIOCM_DTR) + tmp &= ~UART_MCR_DTR; + + if (clear & TIOCM_RTS) + tmp &= ~UART_MCR_RTS; + + if (set & TIOCM_DTR) + tmp |= UART_MCR_DTR; + + if (set & TIOCM_RTS) + tmp |= UART_MCR_RTS; + + status = f81534_set_port_register(port, F81534_MODEM_CONTROL_REG, tmp); + if (status < 0) { + dev_err(&port->dev, "%s: MCR write failed\n", __func__); + mutex_unlock(&port_priv->mcr_mutex); + return status; + } + + port_priv->shadow_mcr = tmp; + mutex_unlock(&port_priv->mcr_mutex); + return 0; +} + +/* + * This function will search the data area with token F81534_CUSTOM_VALID_TOKEN + * for latest configuration index. If nothing found + * (*index = F81534_CUSTOM_NO_CUSTOM_DATA), We'll load default configure in + * F81534_DEF_CONF_ADDRESS_START section. + * + * Due to we only use block0 to save data, so *index should be 0 or + * F81534_CUSTOM_NO_CUSTOM_DATA. + */ +static int f81534_find_config_idx(struct usb_serial *serial, u8 *index) +{ + u8 tmp; + int status; + + status = f81534_read_flash(serial, F81534_CUSTOM_ADDRESS_START, 1, + &tmp); + if (status) { + dev_err(&serial->interface->dev, "%s: read failed: %d\n", + __func__, status); + return status; + } + + /* We'll use the custom data when the data is valid. */ + if (tmp == F81534_CUSTOM_VALID_TOKEN) + *index = 0; + else + *index = F81534_CUSTOM_NO_CUSTOM_DATA; + + return 0; +} + +/* + * We had 2 generation of F81532/534 IC. All has an internal storage. + * + * 1st is pure USB-to-TTL RS232 IC and designed for 4 ports only, no any + * internal data will used. All mode and gpio control should manually set + * by AP or Driver and all storage space value are 0xff. The + * f81534_calc_num_ports() will run to final we marked as "oldest version" + * for this IC. + * + * 2rd is designed to more generic to use any transceiver and this is our + * mass production type. We'll save data in F81534_CUSTOM_ADDRESS_START + * (0x2f00) with 9bytes. The 1st byte is a indicater. If the token is + * F81534_CUSTOM_VALID_TOKEN(0xf0), the IC is 2nd gen type, the following + * 4bytes save port mode (0:RS232/1:RS485 Invert/2:RS485), and the last + * 4bytes save GPIO state(value from 0~7 to represent 3 GPIO output pin). + * The f81534_calc_num_ports() will run to "new style" with checking + * F81534_PORT_UNAVAILABLE section. + */ +static int f81534_calc_num_ports(struct usb_serial *serial) +{ + u8 setting[F81534_CUSTOM_DATA_SIZE]; + u8 setting_idx; + u8 num_port = 0; + int status; + size_t i; + + /* Check had custom setting */ + status = f81534_find_config_idx(serial, &setting_idx); + if (status) { + dev_err(&serial->interface->dev, "%s: find idx failed: %d\n", + __func__, status); + return 0; + } + + /* + * We'll read custom data only when data available, otherwise we'll + * read default value instead. + */ + if (setting_idx != F81534_CUSTOM_NO_CUSTOM_DATA) { + status = f81534_read_flash(serial, + F81534_CUSTOM_ADDRESS_START + + F81534_CONF_OFFSET, + sizeof(setting), setting); + if (status) { + dev_err(&serial->interface->dev, + "%s: get custom data failed: %d\n", + __func__, status); + return 0; + } + + dev_dbg(&serial->interface->dev, + "%s: read config from block: %d\n", __func__, + setting_idx); + } else { + /* Read default board setting */ + status = f81534_read_flash(serial, + F81534_DEF_CONF_ADDRESS_START, F81534_NUM_PORT, + setting); + + if (status) { + dev_err(&serial->interface->dev, + "%s: read failed: %d\n", __func__, + status); + return 0; + } + + dev_dbg(&serial->interface->dev, "%s: read default config\n", + __func__); + } + + /* New style, find all possible ports */ + for (i = 0; i < F81534_NUM_PORT; ++i) { + if (setting[i] & F81534_PORT_UNAVAILABLE) + continue; + + ++num_port; + } + + if (num_port) + return num_port; + + dev_warn(&serial->interface->dev, "%s: Read Failed. default 4 ports\n", + __func__); + return 4; /* Nothing found, oldest version IC */ +} + +static void f81534_set_termios(struct tty_struct *tty, + struct usb_serial_port *port, + struct ktermios *old_termios) +{ + u8 new_lcr = 0; + int status; + u32 baud; + + if (C_BAUD(tty) == B0) + f81534_update_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS); + else if (old_termios && (old_termios->c_cflag & CBAUD) == B0) + f81534_update_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0); + + if (C_PARENB(tty)) { + new_lcr |= UART_LCR_PARITY; + + if (!C_PARODD(tty)) + new_lcr |= UART_LCR_EPAR; + + if (C_CMSPAR(tty)) + new_lcr |= UART_LCR_SPAR; + } + + if (C_CSTOPB(tty)) + new_lcr |= UART_LCR_STOP; + + switch (C_CSIZE(tty)) { + case CS5: + new_lcr |= UART_LCR_WLEN5; + break; + case CS6: + new_lcr |= UART_LCR_WLEN6; + break; + case CS7: + new_lcr |= UART_LCR_WLEN7; + break; + default: + case CS8: + new_lcr |= UART_LCR_WLEN8; + break; + } + + baud = tty_get_baud_rate(tty); + if (!baud) + return; + + if (baud > F81534_MAX_BAUDRATE) { + if (old_termios) + baud = tty_termios_baud_rate(old_termios); + else + baud = F81534_DEFAULT_BAUD_RATE; + + tty_encode_baud_rate(tty, baud, baud); + } + + dev_dbg(&port->dev, "%s: baud: %d\n", __func__, baud); + + status = f81534_set_port_config(port, baud, new_lcr); + if (status < 0) { + dev_err(&port->dev, "%s: set port config failed: %d\n", + __func__, status); + } +} + +static int f81534_submit_read_urb(struct usb_serial *serial, gfp_t flags) +{ + return usb_serial_generic_submit_read_urbs(serial->port[0], flags); +} + +static void f81534_msr_changed(struct usb_serial_port *port, u8 msr) +{ + struct f81534_port_private *port_priv = usb_get_serial_port_data(port); + struct tty_struct *tty; + unsigned long flags; + u8 old_msr; + + if (!(msr & UART_MSR_ANY_DELTA)) + return; + + spin_lock_irqsave(&port_priv->msr_lock, flags); + old_msr = port_priv->shadow_msr; + port_priv->shadow_msr = msr; + spin_unlock_irqrestore(&port_priv->msr_lock, flags); + + dev_dbg(&port->dev, "%s: MSR from %02x to %02x\n", __func__, old_msr, + msr); + + /* Update input line counters */ + if (msr & UART_MSR_DCTS) + port->icount.cts++; + if (msr & UART_MSR_DDSR) + port->icount.dsr++; + if (msr & UART_MSR_DDCD) + port->icount.dcd++; + if (msr & UART_MSR_TERI) + port->icount.rng++; + + wake_up_interruptible(&port->port.delta_msr_wait); + + if (!(msr & UART_MSR_DDCD)) + return; + + dev_dbg(&port->dev, "%s: DCD Changed: phy_num: %d from %x to %x\n", + __func__, port_priv->phy_num, old_msr, msr); + + tty = tty_port_tty_get(&port->port); + if (!tty) + return; + + usb_serial_handle_dcd_change(port, tty, msr & UART_MSR_DCD); + tty_kref_put(tty); +} + +static int f81534_read_msr(struct usb_serial_port *port) +{ + struct f81534_port_private *port_priv = usb_get_serial_port_data(port); + unsigned long flags; + int status; + u8 msr; + + /* Get MSR initial value */ + status = f81534_get_port_register(port, F81534_MODEM_STATUS_REG, &msr); + if (status) + return status; + + /* Force update current state */ + spin_lock_irqsave(&port_priv->msr_lock, flags); + port_priv->shadow_msr = msr; + spin_unlock_irqrestore(&port_priv->msr_lock, flags); + + return 0; +} + +static int f81534_open(struct tty_struct *tty, struct usb_serial_port *port) +{ + struct f81534_serial_private *serial_priv = + usb_get_serial_data(port->serial); + struct f81534_port_private *port_priv = usb_get_serial_port_data(port); + int status; + + status = f81534_set_port_register(port, + F81534_FIFO_CONTROL_REG, UART_FCR_ENABLE_FIFO | + UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); + if (status) { + dev_err(&port->dev, "%s: Clear FIFO failed: %d\n", __func__, + status); + return status; + } + + if (tty) + f81534_set_termios(tty, port, NULL); + + status = f81534_read_msr(port); + if (status) + return status; + + mutex_lock(&serial_priv->urb_mutex); + + /* Submit Read URBs for first port opened */ + if (!serial_priv->opened_port) { + status = f81534_submit_read_urb(port->serial, GFP_KERNEL); + if (status) + goto exit; + } + + serial_priv->opened_port++; + +exit: + mutex_unlock(&serial_priv->urb_mutex); + + set_bit(F81534_TX_EMPTY_BIT, &port_priv->tx_empty); + return status; +} + +static void f81534_close(struct usb_serial_port *port) +{ + struct f81534_serial_private *serial_priv = + usb_get_serial_data(port->serial); + struct usb_serial_port *port0 = port->serial->port[0]; + unsigned long flags; + size_t i; + + usb_kill_urb(port->write_urbs[0]); + + spin_lock_irqsave(&port->lock, flags); + kfifo_reset_out(&port->write_fifo); + spin_unlock_irqrestore(&port->lock, flags); + + /* Kill Read URBs when final port closed */ + mutex_lock(&serial_priv->urb_mutex); + serial_priv->opened_port--; + + if (!serial_priv->opened_port) { + for (i = 0; i < ARRAY_SIZE(port0->read_urbs); ++i) + usb_kill_urb(port0->read_urbs[i]); + } + + mutex_unlock(&serial_priv->urb_mutex); +} + +static int f81534_get_serial_info(struct usb_serial_port *port, + struct serial_struct __user *retinfo) +{ + struct f81534_port_private *port_priv; + struct serial_struct tmp; + + port_priv = usb_get_serial_port_data(port); + + memset(&tmp, 0, sizeof(tmp)); + + tmp.type = PORT_16550A; + tmp.port = port->port_number; + tmp.line = port->minor; + tmp.baud_base = F81534_MAX_BAUDRATE; + + if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) + return -EFAULT; + + return 0; +} + +static int f81534_ioctl(struct tty_struct *tty, unsigned int cmd, + unsigned long arg) +{ + struct usb_serial_port *port = tty->driver_data; + struct serial_struct __user *buf = (struct serial_struct __user *)arg; + + switch (cmd) { + case TIOCGSERIAL: + return f81534_get_serial_info(port, buf); + default: + break; + } + + return -ENOIOCTLCMD; +} + +static void f81534_process_per_serial_block(struct usb_serial_port *port, + u8 *data) +{ + struct f81534_port_private *port_priv = usb_get_serial_port_data(port); + int phy_num = data[0]; + size_t read_size = 0; + size_t i; + char tty_flag; + int status; + u8 lsr; + + /* + * The block layout is 128 Bytes + * index 0: port phy idx (e.g., 0,1,2,3), + * index 1: It's could be + * F81534_TOKEN_RECEIVE + * F81534_TOKEN_TX_EMPTY + * F81534_TOKEN_MSR_CHANGE + * index 2: serial in size (data+lsr, must be even) + * meaningful for F81534_TOKEN_RECEIVE only + * index 3: current MSR with this device + * index 4~127: serial in data block (data+lsr, must be even) + */ + switch (data[1]) { + case F81534_TOKEN_TX_EMPTY: + set_bit(F81534_TX_EMPTY_BIT, &port_priv->tx_empty); + + /* Try to submit writer */ + status = f81534_submit_writer(port, GFP_ATOMIC); + if (status) + dev_err(&port->dev, "%s: submit failed\n", __func__); + return; + + case F81534_TOKEN_MSR_CHANGE: + f81534_msr_changed(port, data[3]); + return; + + case F81534_TOKEN_RECEIVE: + read_size = data[2]; + if (read_size > F81534_MAX_RX_SIZE) { + dev_err(&port->dev, + "%s: phy: %d read_size: %zu larger than: %d\n", + __func__, phy_num, read_size, + F81534_MAX_RX_SIZE); + return; + } + + break; + + default: + dev_warn(&port->dev, "%s: unknown token: %02x\n", __func__, + data[1]); + return; + } + + for (i = 4; i < 4 + read_size; i += 2) { + tty_flag = TTY_NORMAL; + lsr = data[i + 1]; + + if (lsr & UART_LSR_BRK_ERROR_BITS) { + if (lsr & UART_LSR_BI) { + tty_flag = TTY_BREAK; + port->icount.brk++; + usb_serial_handle_break(port); + } else if (lsr & UART_LSR_PE) { + tty_flag = TTY_PARITY; + port->icount.parity++; + } else if (lsr & UART_LSR_FE) { + tty_flag = TTY_FRAME; + port->icount.frame++; + } + + if (lsr & UART_LSR_OE) { + port->icount.overrun++; + tty_insert_flip_char(&port->port, 0, + TTY_OVERRUN); + } + } + + if (port->port.console && port->sysrq) { + if (usb_serial_handle_sysrq_char(port, data[i])) + continue; + } + + tty_insert_flip_char(&port->port, data[i], tty_flag); + } + + tty_flip_buffer_push(&port->port); +} + +static void f81534_process_read_urb(struct urb *urb) +{ + struct f81534_serial_private *serial_priv; + struct usb_serial_port *port; + struct usb_serial *serial; + u8 *buf; + int phy_port_num; + int tty_port_num; + size_t i; + + if (!urb->actual_length || + urb->actual_length % F81534_RECEIVE_BLOCK_SIZE) { + return; + } + + port = urb->context; + serial = port->serial; + buf = urb->transfer_buffer; + serial_priv = usb_get_serial_data(serial); + + for (i = 0; i < urb->actual_length; i += F81534_RECEIVE_BLOCK_SIZE) { + phy_port_num = buf[i]; + if (phy_port_num >= F81534_NUM_PORT) { + dev_err(&port->dev, + "%s: phy_port_num: %d larger than: %d\n", + __func__, phy_port_num, F81534_NUM_PORT); + continue; + } + + tty_port_num = serial_priv->tty_idx[phy_port_num]; + port = serial->port[tty_port_num]; + + if (tty_port_initialized(&port->port)) + f81534_process_per_serial_block(port, &buf[i]); + } +} + +static void f81534_write_usb_callback(struct urb *urb) +{ + struct usb_serial_port *port = urb->context; + + switch (urb->status) { + case 0: + break; + case -ENOENT: + case -ECONNRESET: + case -ESHUTDOWN: + dev_dbg(&port->dev, "%s - urb stopped: %d\n", + __func__, urb->status); + return; + case -EPIPE: + dev_err(&port->dev, "%s - urb stopped: %d\n", + __func__, urb->status); + return; + default: + dev_dbg(&port->dev, "%s - nonzero urb status: %d\n", + __func__, urb->status); + break; + } +} + +static int f81534_setup_ports(struct usb_serial *serial) +{ + struct usb_serial_port *port; + u8 port0_out_address; + int buffer_size; + size_t i; + + /* + * In our system architecture, we had 2 or 4 serial ports, + * but only get 1 set of bulk in/out endpoints. + * + * The usb-serial subsystem will generate port 0 data, + * but port 1/2/3 will not. It's will generate write URB and buffer + * by following code and use the port0 read URB for read operation. + */ + for (i = 1; i < serial->num_ports; ++i) { + port0_out_address = serial->port[0]->bulk_out_endpointAddress; + buffer_size = serial->port[0]->bulk_out_size; + port = serial->port[i]; + + if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL)) + return -ENOMEM; + + port->bulk_out_size = buffer_size; + port->bulk_out_endpointAddress = port0_out_address; + + port->write_urbs[0] = usb_alloc_urb(0, GFP_KERNEL); + if (!port->write_urbs[0]) + return -ENOMEM; + + port->bulk_out_buffers[0] = kzalloc(buffer_size, GFP_KERNEL); + if (!port->bulk_out_buffers[0]) + return -ENOMEM; + + usb_fill_bulk_urb(port->write_urbs[0], serial->dev, + usb_sndbulkpipe(serial->dev, + port0_out_address), + port->bulk_out_buffers[0], buffer_size, + serial->type->write_bulk_callback, port); + + port->write_urb = port->write_urbs[0]; + port->bulk_out_buffer = port->bulk_out_buffers[0]; + } + + return 0; +} + +static int f81534_probe(struct usb_serial *serial, + const struct usb_device_id *id) +{ + struct usb_endpoint_descriptor *endpoint; + struct usb_host_interface *iface_desc; + struct device *dev; + int num_bulk_in = 0; + int num_bulk_out = 0; + int size_bulk_in = 0; + int size_bulk_out = 0; + int i; + + dev = &serial->interface->dev; + iface_desc = serial->interface->cur_altsetting; + + for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { + endpoint = &iface_desc->endpoint[i].desc; + + if (usb_endpoint_is_bulk_in(endpoint)) { + ++num_bulk_in; + size_bulk_in = usb_endpoint_maxp(endpoint); + } + + if (usb_endpoint_is_bulk_out(endpoint)) { + ++num_bulk_out; + size_bulk_out = usb_endpoint_maxp(endpoint); + } + } + + if (num_bulk_in != 1 || num_bulk_out != 1) { + dev_err(dev, "expected endpoints not found\n"); + return -ENODEV; + } + + if (size_bulk_out != F81534_WRITE_BUFFER_SIZE || + size_bulk_in != F81534_MAX_RECEIVE_BLOCK_SIZE) { + dev_err(dev, "unsupported endpoint max packet size\n"); + return -ENODEV; + } + + return 0; +} + +static int f81534_attach(struct usb_serial *serial) +{ + struct f81534_serial_private *serial_priv; + int index = 0; + int status; + int i; + + serial_priv = devm_kzalloc(&serial->interface->dev, + sizeof(*serial_priv), GFP_KERNEL); + if (!serial_priv) + return -ENOMEM; + + usb_set_serial_data(serial, serial_priv); + + mutex_init(&serial_priv->urb_mutex); + + status = f81534_setup_ports(serial); + if (status) + return status; + + /* Check had custom setting */ + status = f81534_find_config_idx(serial, &serial_priv->setting_idx); + if (status) { + dev_err(&serial->interface->dev, "%s: find idx failed: %d\n", + __func__, status); + return status; + } + + /* + * We'll read custom data only when data available, otherwise we'll + * read default value instead. + */ + if (serial_priv->setting_idx == F81534_CUSTOM_NO_CUSTOM_DATA) { + /* + * The default configuration layout: + * byte 0/1/2/3: uart setting + */ + status = f81534_read_flash(serial, + F81534_DEF_CONF_ADDRESS_START, + F81534_DEF_CONF_SIZE, + serial_priv->conf_data); + if (status) { + dev_err(&serial->interface->dev, + "%s: read reserve data failed: %d\n", + __func__, status); + return status; + } + } else { + /* Only read 8 bytes for mode & GPIO */ + status = f81534_read_flash(serial, + F81534_CUSTOM_ADDRESS_START + + F81534_CONF_OFFSET, + sizeof(serial_priv->conf_data), + serial_priv->conf_data); + if (status) { + dev_err(&serial->interface->dev, + "%s: idx: %d get data failed: %d\n", + __func__, serial_priv->setting_idx, + status); + return status; + } + } + + /* Assign phy-to-logic mapping */ + for (i = 0; i < F81534_NUM_PORT; ++i) { + if (serial_priv->conf_data[i] & F81534_PORT_UNAVAILABLE) + continue; + + serial_priv->tty_idx[i] = index++; + dev_dbg(&serial->interface->dev, + "%s: phy_num: %d, tty_idx: %d\n", __func__, i, + serial_priv->tty_idx[i]); + } + + return 0; +} + +static int f81534_port_probe(struct usb_serial_port *port) +{ + struct f81534_port_private *port_priv; + + port_priv = devm_kzalloc(&port->dev, sizeof(*port_priv), GFP_KERNEL); + if (!port_priv) + return -ENOMEM; + + spin_lock_init(&port_priv->msr_lock); + mutex_init(&port_priv->mcr_mutex); + + /* Assign logic-to-phy mapping */ + port_priv->phy_num = f81534_logic_to_phy_port(port->serial, port); + if (port_priv->phy_num < 0 || port_priv->phy_num >= F81534_NUM_PORT) + return -ENODEV; + + usb_set_serial_port_data(port, port_priv); + dev_dbg(&port->dev, "%s: port_number: %d, phy_num: %d\n", __func__, + port->port_number, port_priv->phy_num); + + return 0; +} + +static int f81534_tiocmget(struct tty_struct *tty) +{ + struct usb_serial_port *port = tty->driver_data; + struct f81534_port_private *port_priv = usb_get_serial_port_data(port); + int status; + int r; + u8 msr; + u8 mcr; + + /* Read current MSR from device */ + status = f81534_get_port_register(port, F81534_MODEM_STATUS_REG, &msr); + if (status) + return status; + + mutex_lock(&port_priv->mcr_mutex); + mcr = port_priv->shadow_mcr; + mutex_unlock(&port_priv->mcr_mutex); + + r = (mcr & UART_MCR_DTR ? TIOCM_DTR : 0) | + (mcr & UART_MCR_RTS ? TIOCM_RTS : 0) | + (msr & UART_MSR_CTS ? TIOCM_CTS : 0) | + (msr & UART_MSR_DCD ? TIOCM_CAR : 0) | + (msr & UART_MSR_RI ? TIOCM_RI : 0) | + (msr & UART_MSR_DSR ? TIOCM_DSR : 0); + + return r; +} + +static int f81534_tiocmset(struct tty_struct *tty, unsigned int set, + unsigned int clear) +{ + struct usb_serial_port *port = tty->driver_data; + + return f81534_update_mctrl(port, set, clear); +} + +static void f81534_dtr_rts(struct usb_serial_port *port, int on) +{ + if (on) + f81534_update_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0); + else + f81534_update_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS); +} + +static int f81534_write(struct tty_struct *tty, struct usb_serial_port *port, + const u8 *buf, int count) +{ + int bytes_out, status; + + if (!count) + return 0; + + bytes_out = kfifo_in_locked(&port->write_fifo, buf, count, + &port->lock); + + status = f81534_submit_writer(port, GFP_ATOMIC); + if (status) { + dev_err(&port->dev, "%s: submit failed\n", __func__); + return status; + } + + return bytes_out; +} + +static bool f81534_tx_empty(struct usb_serial_port *port) +{ + struct f81534_port_private *port_priv = usb_get_serial_port_data(port); + + return test_bit(F81534_TX_EMPTY_BIT, &port_priv->tx_empty); +} + +static int f81534_resume(struct usb_serial *serial) +{ + struct f81534_serial_private *serial_priv = + usb_get_serial_data(serial); + struct usb_serial_port *port; + int error = 0; + int status; + size_t i; + + /* + * We'll register port 0 bulkin when port had opened, It'll take all + * port received data, MSR register change and TX_EMPTY information. + */ + mutex_lock(&serial_priv->urb_mutex); + + if (serial_priv->opened_port) { + status = f81534_submit_read_urb(serial, GFP_NOIO); + if (status) { + mutex_unlock(&serial_priv->urb_mutex); + return status; + } + } + + mutex_unlock(&serial_priv->urb_mutex); + + for (i = 0; i < serial->num_ports; i++) { + port = serial->port[i]; + if (!tty_port_initialized(&port->port)) + continue; + + status = f81534_submit_writer(port, GFP_NOIO); + if (status) { + dev_err(&port->dev, "%s: submit failed\n", __func__); + ++error; + } + } + + if (error) + return -EIO; + + return 0; +} + +static struct usb_serial_driver f81534_device = { + .driver = { + .owner = THIS_MODULE, + .name = "f81534", + }, + .description = DRIVER_DESC, + .id_table = f81534_id_table, + .open = f81534_open, + .close = f81534_close, + .write = f81534_write, + .tx_empty = f81534_tx_empty, + .calc_num_ports = f81534_calc_num_ports, + .probe = f81534_probe, + .attach = f81534_attach, + .port_probe = f81534_port_probe, + .dtr_rts = f81534_dtr_rts, + .process_read_urb = f81534_process_read_urb, + .ioctl = f81534_ioctl, + .tiocmget = f81534_tiocmget, + .tiocmset = f81534_tiocmset, + .write_bulk_callback = f81534_write_usb_callback, + .set_termios = f81534_set_termios, + .resume = f81534_resume, +}; + +static struct usb_serial_driver *const serial_drivers[] = { + &f81534_device, NULL +}; + +module_usb_serial_driver(serial_drivers, f81534_id_table); + +MODULE_DEVICE_TABLE(usb, f81534_id_table); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_AUTHOR("Peter Hong "); +MODULE_AUTHOR("Tom Tsai "); +MODULE_LICENSE("GPL"); -- 2.20.1