Re: [PATCH V6 1/1] usb:serial: Add Fintek F81532/534 driver

From: Oliver Neukum
Date: Tue Nov 03 2015 - 05:05:27 EST

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On Tue, 2015-11-03 at 11:51 +0800, Peter Hung wrote:
> This driver is for Fintek F81532/F81534 USB to Serial Ports IC.
>
> Features:
> 1. F81534 is 1-to-4 & F81532 is 1-to-2 serial ports IC
> 2. Support Baudrate from B50 to B1500000 (excluding B1000000).
> 3. The RTS signal can be transformed their behavior with
> configuration by ioctl TIOCGRS485/TIOCSRS485
>
> If the driver setting with SER_RS485_ENABLED, the RTS signal will
> high with not in TX and low with in TX.
>
> If the driver setting with SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND,
> the RTS signal will low with not in TX and high with in TX.
>
> 4. The 4x3 output-only open-drain pins for F81532/534 is designed for
> control outer devices (with our EVB for examples, the 4 sets of pins
> are designed to control transceiver mode). So it implements as
> gpiolib interface with output-only function.
> 5. It'll save the configuration in internal storage when uart/pins mode
> changed.
>
> Please reference https://bitbucket.org/hpeter/fintek-general/src/
> with f81534/tools to get set_gpio.c & set_mode.c to change F81532/534
> setting. Please use it carefully.

Hi,

I added remarks among the code they pertain to.

Regards
Oliver
>
> Signed-off-by: Peter Hung <hpeter+linux_kernel@xxxxxxxxx>
> ---
> Changelog:
> v6
> 1. Re-implement the write()/resume() function. Due to this device cant be
> suitable with generic write(), we'll do the submit write URB when
> write()/received tx empty/set_termios()/resume()
> 2. Logic/Phy Port mapping rewrite in f81534_port_probe() &
> f81534_phy_to_logic_port().
> 3. Introduced "Port Hide" function. Some customer use F81532 reference
> design for HW layout, but really use F81534 IC. We'll check
> F81534_PORT_CONF_DISABLE_PORT flag with in uart mode field to do
> port hide with port not used. It can be avoid end-user to use not
> layouted port.
> 4. The 4x3 output-only open-drain pins for F81532/534 is designed for
> control outer devices (with our EVB for examples, the 4 sets of pins
> are designed to control transceiver mode). So we decide to implement
> with gpiolib interface.
>
> v5
> 1. Change the configure data address F81534_CUSTOM_ADDRESS_START
> from 0x4000 to 0x2f00 (for MP F/W ver:AA66)
> 2. Change f81534_port_disable/enable() from H/W mode to S/W mode
> It'll skip all rx data when port is not opened.
> 3. Some function modifier add with static (Thanks for Paul Bolle)
> 4. It's will direct return when count=0 in f81534_write() to
> reduce spin_lock usage.
>
> v4
> 1. clearify f81534_process_read_urb() with
> f81534_process_per_serial_block(). (referenced from mxuport.c)
> 2. We limited f81534_write() max tx kfifo with 124Bytes.
> Original subsystem is designed for auto tranmiting fifo data
> if available. But we must wait for tx_empty for next tx data
> (H/W design).
>
> With this kfifo size limit, we can use generic subsystem api with
> f81534_write(). When usb_serial_generic_write_start() called after
> first write URB complete, the fifo will no data. The generic
> subsystem of write will go to idle state. Until we received
> TX_EMPTY and release write spinlock, the fifo will fill max
> 124Bytes by following f81534_write().
>
> v3
> 1. Migrate read, write and some routine from custom code to usbserial
> subsystem callback function.
> 2. Use more defines to replece magic numbers to make it meaningful
> 3. Make more comments as document in source code.
>
> v2
> 1. v1 version submit to staging tree, but Greg KH advised me to
> cleanup source code & re-submit it to correct subsystem
> 2. Remove all custom ioctl commands
>
> drivers/usb/serial/Kconfig | 10 +
> drivers/usb/serial/Makefile | 1 +
> drivers/usb/serial/f81534.c | 2991 +++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 3002 insertions(+)
> create mode 100644 drivers/usb/serial/f81534.c
>
> diff --git a/drivers/usb/serial/Kconfig b/drivers/usb/serial/Kconfig
> index 56ecb8b..0642864 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 349d9df..9e43b7b 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 0000000..06135c3
> --- /dev/null
> +++ b/drivers/usb/serial/f81534.c
> @@ -0,0 +1,2991 @@
> +/*
> + * F81532/F81534 USB to Serial Ports Bridge
> + *
> + * F81532 => 2 Serial Ports
> + * F81534 => 4 Serial Ports
> + *
> + * Copyright (C) 2014 Tom Tsai (Tom_Tsai@xxxxxxxxxxxxx)
> + *
> + * The F81532/F81534 had 1 control endpoint for setting,
> + * 1 endpoint bulk-out for all serial port write out and
> + * 1 endpoint bulk-in for all serial port read in.
> + *
> + * write URB is fixed with 512bytes, per serial port used 128Bytes.
> + * is can be described by f81534_prepare_write_buffer()
> + *
> + * read URB is 512Bytes max. per serial port used 128Bytes.
> + * is can be described by f81534_process_read_urb(), it' maybe
> + * received with 128x1,2,3,4 bytes.
> + *
> + * We can control M0(SD)/M1/M2 per ports by gpiolib, This IC contains a
> + * internal flash to save configuration. Due to reduce erase/write operation,
> + * it's recommend sequence to request 3 pins, change value and release 3 gpio
> + * pins. We'll really save configurations when M0(SD)/M1/M2 pin all released
> + * for a port.
> + *
> + * Features:
> + * 1. F81534 is 1-to-4 & F81532 is 1-to-2 serial ports IC
> + * 2. Support Baudrate from B50 to B1500000 (excluding B1000000).
> + * 3. The RTS signal can be transformed their behavior with
> + * configuration by default ioctl TIOCGRS485/TIOCSRS485
> + * (for RS232/RS485/RS422 with transceiver)
> + *
> + * If the driver setting with SER_RS485_ENABLED, the RTS signal will
> + * high with not in TX and low with in TX.
> + *
> + * If the driver setting with SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND,
> + * the RTS signal will low with not in TX and high with in TX.
> + *
> + * 4. There are 4x3 output-only ic pins to control transceiver mode with our
> + * EVB Board. It's can be controlled via gpiolib. We could found the gpio
> + * number from /sys/class/tty/ttyUSB[x]/device/gpiochip[yyy] where
> + * x is F81532/534 serial port and yyy is gpiochip number.
> + *
> + * After we found chip number, we can export 3 gpios(M0(SD)/M1/M2) per
> + * serial port by
> + * echo yyy > /sys/class/gpio/export
> + * echo yyy+1 > /sys/class/gpio/export
> + * echo yyy+2 > /sys/class/gpio/export
> + *
> + * then we can control it with
> + * echo [M2 value] > /sys/class/gpio/gpio[yyy]/value
> + * echo [M1 value] > /sys/class/gpio/gpio[yyy+1]/value
> + * echo [M0(SD) value] > /sys/class/gpio/gpio[yyy+2]/value
> + * which M0(SD)/M1/M2 as your desired value, value is only 0 or 1.
> + *
> + * When configure complete, It's a must to free all gpio by
> + * echo yyy > /sys/class/gpio/unexport
> + * echo yyy+1 > /sys/class/gpio/unexport
> + * echo yyy+2 > /sys/class/gpio/unexport
> + *
> + * The driver will "save" gpio configure after we release
> + * all gpio of a serial port.
> + *
> + * For examples to change mode & gpio with F81532/534
> + * Evalaution Board.
> + *
> + * F81532 EVB
> + * port0: F81437 (RS232 only)
> + * port1: F81439 (RS232/RS485/RS422 ... etc.)
> + * F81534 EVB
> + * port0/1: F81437 (RS232 only)
> + * port2/3: F81439 (RS232/RS485/RS422 ... etc.)
> + *
> + * 1. RS232 Mode (Default IC Mode)
> + * 1. Set struct serial_rs485 flags "without" SER_RS485_ENABLED
> + * (control F81532/534 RTS control)
> + * 2. Set M0(SD)/M1/M2 as 0/0/1
> + * (control F81532/534 output pin to control transceiver mode)
> + *
> + * 2. RS485 Mode (RTS Low when TX Mode)
> + * 1. Set struct serial_rs485 flags with SER_RS485_ENABLED
> + * 2. Set M0(SD)/M1/M2 as 0/1/0
> + *
> + * 3. RS485 Mode (RTS High when TX Mode)
> + * 1. Set struct serial_rs485 flags with SER_RS485_ENABLED and
> + * SER_RS485_RTS_ON_SEND
> + * 2. Set M0(SD)/M1/M2 as 0/1/1
> + *
> + * 4. RS422 Mode
> + * 1. The RTS mode is dont care.
> + * 2. Set M0(SD)/M1/M2 as 0/0/0
> + *
> + * Please reference https://bitbucket.org/hpeter/fintek-general/src/
> + * with f81534/tools to get set_gpio.c & set_mode.c. Please use it
> + * carefully.
> + */
> +
> +#include <linux/errno.h>
> +#include <linux/slab.h>
> +#include <linux/tty.h>
> +#include <linux/tty_flip.h>
> +#include <linux/serial.h>
> +#include <linux/usb.h>
> +#include <linux/usb/serial.h>
> +#include <linux/serial_reg.h>
> +#include <linux/kfifo.h>
> +#include <linux/gpio.h>
> +
> +/* Serial Port register Address */
> +#define SERIAL_BASE_ADDRESS 0x1200
> +#define RECEIVE_BUFFER_REGISTER (0x00 + SERIAL_BASE_ADDRESS)
> +#define TRANSMIT_HOLDING_REGISTER (0x00 + SERIAL_BASE_ADDRESS)
> +#define DIVISOR_LATCH_LSB (0x00 + SERIAL_BASE_ADDRESS)
> +#define INTERRUPT_ENABLE_REGISTER (0x01 + SERIAL_BASE_ADDRESS)
> +#define DIVISOR_LATCH_MSB (0x01 + SERIAL_BASE_ADDRESS)
> +#define INTERRUPT_IDENT_REGISTER (0x02 + SERIAL_BASE_ADDRESS)
> +#define FIFO_CONTROL_REGISTER (0x02 + SERIAL_BASE_ADDRESS)
> +#define LINE_CONTROL_REGISTER (0x03 + SERIAL_BASE_ADDRESS)
> +#define MODEM_CONTROL_REGISTER (0x04 + SERIAL_BASE_ADDRESS)
> +#define LINE_STATUS_REGISTER (0x05 + SERIAL_BASE_ADDRESS)
> +#define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS)
> +#define CLK_SEL_REGISTER (0x08 + SERIAL_BASE_ADDRESS)
> +#define CONFIG1_REGISTER (0x09 + SERIAL_BASE_ADDRESS)
> +#define SADDRESS_REGISTER (0x0a + SERIAL_BASE_ADDRESS)
> +#define SADEN_REGISTER (0x0b + SERIAL_BASE_ADDRESS)
> +
> +#define IER_DMA_TX_EN BIT(7)
> +#define IER_DMA_RX_EN BIT(6)
> +
> +#define F81534_DEF_CONF_ADDRESS_START 0x3000
> +#define F81534_DEF_CONF_SIZE 8
> +
> +#define F81534_CUSTOM_ADDRESS_START 0x2f00
> +#define F81534_CUSTOM_TOTAL_SIZE 0x10
> +#define F81534_CUSTOM_DATA_SIZE 0x10
> +#define F81534_CUSTOM_MAX_IDX \
> + (F81534_CUSTOM_TOTAL_SIZE/F81534_CUSTOM_DATA_SIZE)
> +#define F81534_CUSTOM_NO_CUSTOM_DATA (-1)
> +#define F81534_CUSTOM_VALID_TOKEN 0xf0
> +#define F81534_CONF_OFFSET 1
> +#define F81534_CONF_SIZE 4
> +
> +#define F81534_MAX_DATA_BLOCK 64
> +#define F81534_MAX_BUS_RETRY 2000
> +
> +/* default URB timeout for usb operations */
> +#define F81534_USB_MAX_RETRY 10
> +#define F81534_USB_TIMEOUT 1000
> +#define F81534_CONTROL_BYTE 0x1B
> +#define F81534_SET_GET_REGISTER 0xA0
> +
> +#define F81534_NUM_PORT 4
> +#define F81534_UNUSED_PORT 0xff
> +#define F81534_WRITE_BUFFER_SIZE 512
> +
> +#define IC_NAME "f81534"
> +#define DRIVER_DESC \
> + "Fintek USB to Serial Ports Driver (F81532/F81534-Evaluation Board)"
> +#define FINTEK_VENDOR_ID_1 0x1934
> +#define FINTEK_VENDOR_ID_2 0x2C42
> +#define FINTEK_DEVICE_ID 0x1202 /* RS232 four port */
> +#define F81534_MAX_TX_SIZE 100
> +#define F81534_FIFO_SIZE 128
> +#define F81534_RECEIVE_BLOCK_SIZE 128
> +
> +#define F81534_TOKEN_RECEIVE 0x01
> +#define F81534_TOKEN_WRITE 0x02
> +#define F81534_TOKEN_TX_EMPTY 0x03
> +#define F81534_TOKEN_MSR_CHANGE 0x04
> +
> +#define F81534_BUS_BUSY 0x03
> +#define F81534_BUS_IDLE 0x04
> +#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_CMD_ENABLE_WR 0x06
> +#define F81534_CMD_PROGRAM 0x02
> +#define F81534_CMD_ERASE 0x20
> +#define F81534_CMD_READ_STATUS 0x05
> +
> +#define F81534_MEDIA_BUSY_STATUS 0x03
> +
> +#define F81534_1X_RXTRIGGER 0xc3
> +#define F81534_8X_RXTRIGGER 0xcf
> +
> +#define F81534_DEFAULT_BAUD_RATE 9600
> +#define F81534_MAX_BAUDRATE 1500000
> +
> +#define F81534_DELAY_READ_MSR 10
> +
> +#define F81534_RS232_FLAG 0x00
> +#define F81534_RS485_FLAG 0x03
> +#define F81534_RS485_1_FLAG 0x01
> +#define F81534_MODE_MASK 0x03
> +#define F81534_PORT_CONF_RS485 BIT(0)
> +#define F81534_PORT_CONF_RS485_INVERT BIT(1)
> +#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_RS485_MODE BIT(4)
> +#define F81534_RS485_INVERT BIT(5)
> +
> +#define F81534_PIN_SET_DEFAULT 0x01
> +#define F81534_PIN_SET_MAX 0x07
> +#define F81534_PIN_SET_MIN 0x00
> +
> +/*
> + * For older configuration use. We'll transform it to newer setting after
> + * load it.
> + */
> +#define F81534_OLD_CONFIG_37 0x37
> +#define F81534_OLD_CONFIG_38 0x38
> +#define F81534_OLD_CONFIG_39 0x39
> +
> +enum uart_mode {
> + uart_mode_rs422,
> + uart_mode_rs232,
> + uart_mode_rs485,
> + uart_mode_rs485_1,
> + uart_mode_rs422_term,
> + uart_mode_rs232_coexist,
> + uart_mode_rs485_1_term,
> + uart_mode_shutdown,
> + uart_mode_invalid,
> +};
> +
> +struct f81534_pin_config_data {
> + enum uart_mode force_uart_mode;
> + u8 gpio_mode;
> + const int address[9];
> + const int offset[9];
> +};
> +
> +/* Save for a control register and bit offset */
> +struct reg_value {
> + const u16 reg_address;
> + const u16 reg_offset;
> + const u16 reg_bit;
> +};
> +
> +/* 3 control register to configuration a output pin mode and value */
> +struct pin_data {
> + struct reg_value port_mode_1;
> + struct reg_value port_mode_0;
> + struct reg_value port_io;
> +};
> +
> +/* 3 output pins to control transceiver mode */
> +struct out_pin {
> + struct pin_data m1;
> + struct pin_data m2;
> + struct pin_data m0_sd;
> +};
> +
> +struct io_map_value {
> + int product_id;
> + int max_port;
> + enum uart_mode mode;
> + struct out_pin port[MAX_NUM_PORTS + 1];
> +};
> +
> +/*
> + * The following magic numbers is F81532/534 output pin
> + * register maps
> + */
> +static const struct io_map_value f81534_rs232_control = {
> + FINTEK_DEVICE_ID, F81534_NUM_PORT, uart_mode_rs232,
> + {
> + /* please reference f81439 io port */
> + {
> + {{0x2ad5, 4, 0}, {0x2ad4, 4, 1}, {0x2a90, 4, 0},},
> + {{0x2ad5, 5, 0}, {0x2ad4, 5, 1}, {0x2a90, 5, 0},},
> + {{0x2add, 7, 0}, {0x2adc, 7, 1}, {0x2ae8, 7, 1},},
> + },
> + {
> + {{0x2add, 3, 0}, {0x2adc, 3, 1}, {0x2ae8, 3, 0},},
> + {{0x2add, 0, 0}, {0x2adc, 0, 1}, {0x2ae8, 0, 0},},
> + {{0x2add, 6, 0}, {0x2adc, 6, 1}, {0x2ae8, 6, 1},},
> + },
> + {
> + {{0x2ad3, 6, 0}, {0x2ad2, 6, 1}, {0x2a80, 6, 0},},
> + {{0x2add, 2, 0}, {0x2adc, 2, 1}, {0x2ae8, 2, 0},},
> + {{0x2ad5, 0, 0}, {0x2ad4, 0, 1}, {0x2a90, 0, 1},},
> + },
> + {
> + {{0x2ad5, 1, 0}, {0x2ad4, 1, 1}, {0x2a90, 1, 0},},
> + {{0x2ad5, 2, 0}, {0x2ad4, 2, 1}, {0x2a90, 2, 0},},
> + {{0x2ad5, 3, 0}, {0x2ad4, 3, 1}, {0x2a90, 3, 1},},
> + },
> + },
> +};
> +
> +static const struct io_map_value f81534_rs485_control = {
> + FINTEK_DEVICE_ID, F81534_NUM_PORT, uart_mode_rs485,
> + {
> + /* please reference f81439 io port */
> + {
> + {{0x2ad5, 4, 0}, {0x2ad4, 4, 1}, {0x2a90, 4, 0},},
> + {{0x2ad5, 5, 0}, {0x2ad4, 5, 1}, {0x2a90, 5, 1},},
> + {{0x2add, 7, 0}, {0x2adc, 7, 1}, {0x2ae8, 7, 0},},
> + },
> + {
> + {{0x2add, 3, 0}, {0x2adc, 3, 1}, {0x2ae8, 3, 0},},
> + {{0x2add, 0, 0}, {0x2adc, 0, 1}, {0x2ae8, 0, 1},},
> + {{0x2add, 6, 0}, {0x2adc, 6, 1}, {0x2ae8, 6, 0},},
> + },
> + {
> + {{0x2ad3, 6, 0}, {0x2ad2, 6, 1}, {0x2a80, 6, 0},},
> + {{0x2add, 2, 0}, {0x2adc, 2, 1}, {0x2ae8, 2, 1},},
> + {{0x2ad5, 0, 0}, {0x2ad4, 0, 1}, {0x2a90, 0, 0},},
> + },
> + {
> + {{0x2ad5, 1, 0}, {0x2ad4, 1, 1}, {0x2a90, 1, 0},},
> + {{0x2ad5, 2, 0}, {0x2ad4, 2, 1}, {0x2a90, 2, 1},},
> + {{0x2ad5, 3, 0}, {0x2ad4, 3, 1}, {0x2a90, 3, 0},},
> + },
> + },
> +};
> +
> +static const struct io_map_value f81534_rs485_1_control = {
> + FINTEK_DEVICE_ID, F81534_NUM_PORT, uart_mode_rs485_1,
> + {
> + /* please reference f81439 io port */
> + {
> + {{0x2ad5, 4, 0}, {0x2ad4, 4, 1}, {0x2a90, 4, 0},},
> + {{0x2ad5, 5, 0}, {0x2ad4, 5, 1}, {0x2a90, 5, 1},},
> + {{0x2add, 7, 0}, {0x2adc, 7, 1}, {0x2ae8, 7, 1},},
> + },
> + {
> + {{0x2add, 3, 0}, {0x2adc, 3, 1}, {0x2ae8, 3, 0},},
> + {{0x2add, 0, 0}, {0x2adc, 0, 1}, {0x2ae8, 0, 1},},
> + {{0x2add, 6, 0}, {0x2adc, 6, 1}, {0x2ae8, 6, 1},},
> + },
> + {
> + {{0x2ad3, 6, 0}, {0x2ad2, 6, 1}, {0x2a80, 6, 0},},
> + {{0x2add, 2, 0}, {0x2adc, 2, 1}, {0x2ae8, 2, 1},},
> + {{0x2ad5, 0, 0}, {0x2ad4, 0, 1}, {0x2a90, 0, 1},},
> + },
> + {
> + {{0x2ad5, 1, 0}, {0x2ad4, 1, 1}, {0x2a90, 1, 0},},
> + {{0x2ad5, 2, 0}, {0x2ad4, 2, 1}, {0x2a90, 2, 1},},
> + {{0x2ad5, 3, 0}, {0x2ad4, 3, 1}, {0x2a90, 3, 1},},
> + },
> + },
> +};
> +
> +static const struct io_map_value f81534_rs422_control = {
> + FINTEK_DEVICE_ID, F81534_NUM_PORT, uart_mode_rs422,
> + {
> + /* please reference f81439 io port */
> + {
> + {{0x2ad5, 4, 0}, {0x2ad4, 4, 1}, {0x2a90, 4, 0},},
> + {{0x2ad5, 5, 0}, {0x2ad4, 5, 1}, {0x2a90, 5, 0},},
> + {{0x2add, 7, 0}, {0x2adc, 7, 1}, {0x2ae8, 7, 0},},
> + },
> + {
> + {{0x2add, 3, 0}, {0x2adc, 3, 1}, {0x2ae8, 3, 0},},
> + {{0x2add, 0, 0}, {0x2adc, 0, 1}, {0x2ae8, 0, 0},},
> + {{0x2add, 6, 0}, {0x2adc, 6, 1}, {0x2ae8, 6, 0},},
> + },
> + {
> + {{0x2ad3, 6, 0}, {0x2ad2, 6, 1}, {0x2a80, 6, 0},},
> + {{0x2add, 2, 0}, {0x2adc, 2, 1}, {0x2ae8, 2, 0},},
> + {{0x2ad5, 0, 0}, {0x2ad4, 0, 1}, {0x2a90, 0, 0},},
> + },
> + {
> + {{0x2ad5, 1, 0}, {0x2ad4, 1, 1}, {0x2a90, 1, 0},},
> + {{0x2ad5, 2, 0}, {0x2ad4, 2, 1}, {0x2a90, 2, 0},},
> + {{0x2ad5, 3, 0}, {0x2ad4, 3, 1}, {0x2a90, 3, 0},},
> + },
> + },
> +};
> +
> +static const struct io_map_value f81534_shutdown_control = {
> + FINTEK_DEVICE_ID, F81534_NUM_PORT, uart_mode_shutdown,
> + {
> + /* please reference f81439 io port */
> + {
> + {{0x2ad5, 4, 0}, {0x2ad4, 4, 1}, {0x2a90, 4, 1},},
> + {{0x2ad5, 5, 0}, {0x2ad4, 5, 1}, {0x2a90, 5, 1},},
> + {{0x2add, 7, 0}, {0x2adc, 7, 1}, {0x2ae8, 7, 1},},
> + },
> + {
> + {{0x2add, 3, 0}, {0x2adc, 3, 1}, {0x2ae8, 3, 1},},
> + {{0x2add, 0, 0}, {0x2adc, 0, 1}, {0x2ae8, 0, 1},},
> + {{0x2add, 6, 0}, {0x2adc, 6, 1}, {0x2ae8, 6, 1},},
> + },
> + {
> + {{0x2ad3, 6, 0}, {0x2ad2, 6, 1}, {0x2a80, 6, 1},},
> + {{0x2add, 2, 0}, {0x2adc, 2, 1}, {0x2ae8, 2, 1},},
> + {{0x2ad5, 0, 0}, {0x2ad4, 0, 1}, {0x2a90, 0, 1},},
> + },
> + {
> + {{0x2ad5, 1, 0}, {0x2ad4, 1, 1}, {0x2a90, 1, 1},},
> + {{0x2ad5, 2, 0}, {0x2ad4, 2, 1}, {0x2a90, 2, 1},},
> + {{0x2ad5, 3, 0}, {0x2ad4, 3, 1}, {0x2a90, 3, 1},},
> + },
> + },
> +};
> +
> +static const struct io_map_value f81534_rs422_term_control = {
> + FINTEK_DEVICE_ID, F81534_NUM_PORT, uart_mode_shutdown,
> + {
> + /* please reference f81439 io port */
> + {
> + {{0x2ad5, 4, 0}, {0x2ad4, 4, 1}, {0x2a90, 4, 1},},
> + {{0x2ad5, 5, 0}, {0x2ad4, 5, 1}, {0x2a90, 5, 0},},
> + {{0x2add, 7, 0}, {0x2adc, 7, 1}, {0x2ae8, 7, 0},},
> + },
> + {
> + {{0x2add, 3, 0}, {0x2adc, 3, 1}, {0x2ae8, 3, 1},},
> + {{0x2add, 0, 0}, {0x2adc, 0, 1}, {0x2ae8, 0, 0},},
> + {{0x2add, 6, 0}, {0x2adc, 6, 1}, {0x2ae8, 6, 0},},
> + },
> + {
> + {{0x2ad3, 6, 0}, {0x2ad2, 6, 1}, {0x2a80, 6, 1},},
> + {{0x2add, 2, 0}, {0x2adc, 2, 1}, {0x2ae8, 2, 0},},
> + {{0x2ad5, 0, 0}, {0x2ad4, 0, 1}, {0x2a90, 0, 0},},
> + },
> + {
> + {{0x2ad5, 1, 0}, {0x2ad4, 1, 1}, {0x2a90, 1, 1},},
> + {{0x2ad5, 2, 0}, {0x2ad4, 2, 1}, {0x2a90, 2, 0},},
> + {{0x2ad5, 3, 0}, {0x2ad4, 3, 1}, {0x2a90, 3, 0},},
> + },
> + },
> +};
> +
> +static const struct io_map_value f81534_rs232_coexist_control = {
> + FINTEK_DEVICE_ID, F81534_NUM_PORT, uart_mode_shutdown,
> + {
> + /* please reference f81439 io port */
> + {
> + {{0x2ad5, 4, 0}, {0x2ad4, 4, 1}, {0x2a90, 4, 1},},
> + {{0x2ad5, 5, 0}, {0x2ad4, 5, 1}, {0x2a90, 5, 0},},
> + {{0x2add, 7, 0}, {0x2adc, 7, 1}, {0x2ae8, 7, 1},},
> + },
> + {
> + {{0x2add, 3, 0}, {0x2adc, 3, 1}, {0x2ae8, 3, 1},},
> + {{0x2add, 0, 0}, {0x2adc, 0, 1}, {0x2ae8, 0, 0},},
> + {{0x2add, 6, 0}, {0x2adc, 6, 1}, {0x2ae8, 6, 1},},
> + },
> + {
> + {{0x2ad3, 6, 0}, {0x2ad2, 6, 1}, {0x2a80, 6, 1},},
> + {{0x2add, 2, 0}, {0x2adc, 2, 1}, {0x2ae8, 2, 0},},
> + {{0x2ad5, 0, 0}, {0x2ad4, 0, 1}, {0x2a90, 0, 1},},
> + },
> + {
> + {{0x2ad5, 1, 0}, {0x2ad4, 1, 1}, {0x2a90, 1, 1},},
> + {{0x2ad5, 2, 0}, {0x2ad4, 2, 1}, {0x2a90, 2, 0},},
> + {{0x2ad5, 3, 0}, {0x2ad4, 3, 1}, {0x2a90, 3, 1},},
> + },
> + },
> +};
> +
> +static const struct io_map_value f81534_rs485_1_term_control = {
> + FINTEK_DEVICE_ID, F81534_NUM_PORT, uart_mode_shutdown,
> + {
> + /* please reference f81439 io port */
> + {
> + {{0x2ad5, 4, 0}, {0x2ad4, 4, 1}, {0x2a90, 4, 1},},
> + {{0x2ad5, 5, 0}, {0x2ad4, 5, 1}, {0x2a90, 5, 1},},
> + {{0x2add, 7, 0}, {0x2adc, 7, 1}, {0x2ae8, 7, 0},},
> + },
> + {
> + {{0x2add, 3, 0}, {0x2adc, 3, 1}, {0x2ae8, 3, 1},},
> + {{0x2add, 0, 0}, {0x2adc, 0, 1}, {0x2ae8, 0, 1},},
> + {{0x2add, 6, 0}, {0x2adc, 6, 1}, {0x2ae8, 6, 0},},
> + },
> + {
> + {{0x2ad3, 6, 0}, {0x2ad2, 6, 1}, {0x2a80, 6, 1},},
> + {{0x2add, 2, 0}, {0x2adc, 2, 1}, {0x2ae8, 2, 1},},
> + {{0x2ad5, 0, 0}, {0x2ad4, 0, 1}, {0x2a90, 0, 0},},
> + },
> + {
> + {{0x2ad5, 1, 0}, {0x2ad4, 1, 1}, {0x2a90, 1, 1},},
> + {{0x2ad5, 2, 0}, {0x2ad4, 2, 1}, {0x2a90, 2, 1},},
> + {{0x2ad5, 3, 0}, {0x2ad4, 3, 1}, {0x2a90, 3, 0},},
> + },
> + },
> +};
> +
> +static const struct io_map_value *f81534_mode_control[uart_mode_invalid] = {
> + &f81534_rs422_control,
> + &f81534_rs232_control,
> + &f81534_rs485_control,
> + &f81534_rs485_1_control,
> + &f81534_rs422_term_control,
> + &f81534_rs232_coexist_control,
> + &f81534_rs485_1_term_control,
> + &f81534_shutdown_control,
> +};
> +
> +static const struct usb_device_id id_table[] = {
> + {USB_DEVICE(FINTEK_VENDOR_ID_1, FINTEK_DEVICE_ID)},
> + {USB_DEVICE(FINTEK_VENDOR_ID_2, FINTEK_DEVICE_ID)},
> + {} /* Terminating entry */
> +};
> +
> +MODULE_DEVICE_TABLE(usb, id_table);
> +
> +struct f81534_serial_private {
> + bool is_phy_port_not_empty[F81534_NUM_PORT];
> + spinlock_t tx_empty_lock;
> + struct mutex change_mode_mutex;
> + u8 default_conf_data[F81534_DEF_CONF_SIZE];
> + u32 setting_idx;
> + atomic_t port_active[F81534_NUM_PORT];
> +};
> +
> +struct f81534_port_private {
> + u8 phy;
> + u8 shadow_mcr;
> + u8 shadow_lcr;
> + u32 current_baud_rate;
> + u32 current_baud_base;
> + struct f81534_pin_config_data port_pin_data;
> + struct gpio_chip f81534_gpio_chip;
> + atomic_t gpio_active;
> + spinlock_t msr_lock;
> + struct mutex msr_mutex;
> + u8 shadow_msr;
> +};
> +
> +static int f81534_setup_urbs(struct usb_serial *serial);
> +
> +static int f81534_set_normal_register(struct usb_device *dev, u16 reg,
> + u8 data);
> +
> +static int f81534_get_normal_register(struct usb_device *dev, u16 reg,
> + u8 *data);
> +
> +static int f81534_set_normal_register_with_delay(struct usb_serial *usbserial,
> + u16 reg, u8 data);
> +
> +static int f81534_get_normal_register_with_delay(struct usb_serial *usbserial,
> + u16 reg, u8 *data);
> +
> +static int f81534_getregister(struct usb_device *dev, u8 uart, u16 reg,
> + u8 *data);
> +
> +static void f81534_dtr_rts(struct usb_serial_port *port, int on);
> +
> +static int f81534_set_port_mode(struct usb_serial_port *port,
> + enum uart_mode eMode);
> +
> +static int f81534_save_configure_data(struct usb_serial_port *port);
> +
> +static int f81534_switch_gpio_mode(struct usb_serial_port *port, u8 mode);
> +
> +static void f81534_wakeup_all_port(struct usb_serial *serial);
> +
> +static void f81534_compare_msr(struct usb_serial_port *port, u8 *msr,
> + bool is_port_open);
> +
> +static int f81534_prepare_write_buffer(struct usb_serial_port *port,
> + void *dest, size_t size);
> +
> +static int f81534_submit_writer(struct usb_serial_port *port, gfp_t mem_flags);
> +
> +/*
> + * Get the current port index of this device. e.g., 0 is the start index of
> + * this device.
> + */
> +static int f81534_port_index(struct usb_serial_port *port)
> +{
> + return port->port_number;
> +}
> +
> +/*
> + * Find logic serial port index with H/W phy index mapping
> + */
> +static int f81534_phy_to_logic_port(struct usb_serial *serial, int phy)
> +{
> + int count = 0, i;
> + struct f81534_serial_private *serial_priv =
> + usb_get_serial_data(serial);
> +
> + for (i = 0; i < phy; ++i) {
> + if (serial_priv->default_conf_data[i] &
> + F81534_PORT_UNAVAILABLE)
> + continue;
> +
> + count += 1;
> + }
> +
> + dev_dbg(&serial->dev->dev, "%s: phy:%d count:%d\n", __func__, phy,
> + count);
> + return count;
> +}
> +
> +static int f81534_command_delay(struct usb_serial *usbserial)
> +{
> + unsigned int count = F81534_MAX_BUS_RETRY;
> + unsigned char tmp;
> + int status;
> + struct usb_device *dev = usbserial->dev;
> +
> + do {
> + status = f81534_get_normal_register(dev, 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)
> + return -EIO;
> +
> + status = f81534_set_normal_register(dev, F81534_BUS_REG_STATUS,
> + tmp & ~F81534_BUS_IDLE);
> + if (status)
> + return status;
> +
> + return 0;
> +}
> +
> +static int f81534_read_data(struct usb_serial *usbserial, u32 address,
> + u32 size, unsigned char *buf)
> +{
> + u32 count = 0;
> + u32 read_size = 0;
> + u32 block = 0;
> + u8 tmp_buf[F81534_MAX_DATA_BLOCK];
> + int status;
> + int offset;
> +
> + status = f81534_set_normal_register_with_delay(usbserial,
> + F81534_BUS_REG_START, F81534_CMD_READ);
> + if (status)
> + return status;
> +
> + status = f81534_set_normal_register_with_delay(usbserial,
> + F81534_BUS_REG_START, (address >> 16) & 0xff);
> + if (status)
> + return status;
> +
> + status = f81534_set_normal_register_with_delay(usbserial,
> + F81534_BUS_REG_START, (address >> 8) & 0xff);
> + if (status)
> + return status;
> +
> + status = f81534_set_normal_register_with_delay(usbserial,
> + F81534_BUS_REG_START, (address >> 0) & 0xff);
> + if (status)
> + return status;
> +
> + /* continuous read mode */
> + do {
> + read_size = min_t(u32, F81534_MAX_DATA_BLOCK, size);
> +
> + for (count = 0; count < read_size; ++count) {
> +
> + if ((size <= F81534_MAX_DATA_BLOCK) &&
> + (read_size == (count + 1))) {
> + /*
> + * dummy code, force IC to generate a read
> + * pulse, the set of value 0xf1 is dont care
> + * (any value is ok)
> + */
> + status = f81534_set_normal_register_with_delay(
> + usbserial, F81534_BUS_REG_END,
> + 0xf1);
> + if (status)
> + return status;
> + } else {
> + /*
> + * dummy code, force IC to generate a read
> + * pulse, the set of value 0xf1 is dont care
> + * (any value is ok)
> + */
> + status = f81534_set_normal_register_with_delay(
> + usbserial,
> + F81534_BUS_REG_START, 0xf1);
> + if (status)
> + return status;
> + }
> +
> + status = f81534_get_normal_register_with_delay(
> + usbserial,
> + 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 += 1;
> + } while (size);
> +
> + return 0;
> +}
> +
> +/*
> + * This function maybe cause IC no workable, Please take this carefully.
> + *
> + * The function is used to modify the configuration area of this device
> + * (F81534_CUSTOM_ADDRESS_START). If wrong operation with this function, it'll
> + * make the device malfuncional.
> + */
> +static int f81534_write_data(struct usb_serial *usbserial, int address,
> + int size, unsigned char *buf)
> +{
> + unsigned int count = 0;
> + unsigned int write_size = 0;
> + unsigned int block = 0;
> + int offset;
> + int status;
> +
> + status = f81534_set_normal_register_with_delay(usbserial,
> + F81534_BUS_REG_END, F81534_CMD_ENABLE_WR);
> + if (status)
> + return status;
> +
> + status = f81534_set_normal_register_with_delay(usbserial,
> + F81534_BUS_REG_START, F81534_CMD_PROGRAM);
> + if (status)
> + return status;
> +
> + status = f81534_set_normal_register_with_delay(usbserial,
> + F81534_BUS_REG_START, (address >> 16) & 0xff);
> + if (status)
> + return status;
> +
> + status = f81534_set_normal_register_with_delay(usbserial,
> + F81534_BUS_REG_START, (address >> 8) & 0xff);
> + if (status)
> + return status;
> +
> + status = f81534_set_normal_register_with_delay(usbserial,
> + F81534_BUS_REG_START, (address >> 0) & 0xff);
> + if (status)
> + return status;
> +
> + do {
> + write_size = min(F81534_MAX_DATA_BLOCK, size);
> +
> + for (count = 0; count < write_size; ++count) {
> + offset = count + block * F81534_MAX_DATA_BLOCK;
> +
> + if ((size <= F81534_MAX_DATA_BLOCK)
> + && (write_size == (count + 1))) {
> + status = f81534_set_normal_register_with_delay(
> + usbserial,
> + F81534_BUS_REG_END,
> + buf[offset]);
> + if (status)
> + return status;
> + } else {
> + status = f81534_set_normal_register_with_delay(
> + usbserial,
> + F81534_BUS_REG_START,
> + buf[offset]);
> + if (status)
> + return status;
> + }
> + }
> +
> + size -= write_size;
> + block += 1;
> + } while (size);
> +
> + return 0;
> +}
> +
> +/*
> + * This function maybe cause IC no workable, Please take this carefully.
> + *
> + * The function is used to clear the configuration area of this device
> + * (F81534_CUSTOM_ADDRESS_START). If wrong operation with this function, it'll
> + * make the device malfuncional.
> + */
> +static int f81534_erase_sector(struct usb_serial *usbserial, int address)
> +{
> + u8 current_status = 0;
> + int status;
> + unsigned int count = F81534_MAX_BUS_RETRY;
> +
> + status = f81534_set_normal_register_with_delay(usbserial,
> + F81534_BUS_REG_END, F81534_CMD_ENABLE_WR);
> + if (status)
> + return status;
> +
> + status = f81534_set_normal_register_with_delay(usbserial,
> + F81534_BUS_REG_START, F81534_CMD_ERASE);
> + if (status)
> + return status;
> +
> + status = f81534_set_normal_register_with_delay(usbserial,
> + F81534_BUS_REG_START, (address >> 16) & 0xff);
> + if (status)
> + return status;
> +
> + status = f81534_set_normal_register_with_delay(usbserial,
> + F81534_BUS_REG_START, (address >> 8) & 0xff);
> + if (status)
> + return status;
> +
> + status = f81534_set_normal_register_with_delay(usbserial,
> + F81534_BUS_REG_END, (address >> 0) & 0xff);
> + if (status)
> + return status;
> +
> + while (--count) {
> + status = f81534_set_normal_register_with_delay(usbserial,
> + F81534_BUS_REG_START,
> + F81534_CMD_READ_STATUS);
> + if (status)
> + return status;
> +
> + /* dummy write, any value is acceptable */
> + status = f81534_set_normal_register_with_delay(usbserial,
> + F81534_BUS_REG_END, 0xff);
> + if (status)
> + return status;
> +
> + status = f81534_get_normal_register_with_delay(usbserial,
> + F81534_BUS_READ_DATA, &current_status);
> + if (status)
> + return status;
> +
> + if (!(F81534_MEDIA_BUSY_STATUS & current_status)) {
> + dev_dbg(&usbserial->dev->dev,
> + "%s: data:%x, count:%d, ok\n",
> + __func__, current_status, count);
> + break;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int f81534_gpio_get(struct gpio_chip *chip, unsigned gpio_num)
> +{
> + struct usb_serial_port *port =
> + container_of(chip->dev, struct usb_serial_port, dev);
> + struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
> + struct f81534_serial_private *serial_priv =
> + usb_get_serial_data(port->serial);
> + int current_mode;
> + int status;
> +
> + status = mutex_lock_interruptible(&serial_priv->change_mode_mutex);
> + if (status) {
> + dev_err(&port->dev, "%s: interrupted!\n", __func__);
> + return status;
> + }
> +
> + current_mode = port_priv->port_pin_data.gpio_mode;
> + current_mode &= BIT(gpio_num);
> +
> + mutex_unlock(&serial_priv->change_mode_mutex);
> + f81534_wakeup_all_port(port->serial);
> +
> + return !!current_mode;
> +}
> +
> +static int f81534_gpio_direction_in(struct gpio_chip *chip, unsigned gpio_num)
> +{
> + /* always failed */
> + return -EINVAL;
> +}
> +
> +static int f81534_gpio_direction_out(struct gpio_chip *chip,
> + unsigned gpio_num, int val)
> +{
> + /* always successful */
> + return 0;
> +}
> +
> +static void f81534_gpio_set(struct gpio_chip *chip, unsigned gpio_num, int val)
> +{
> + struct usb_serial_port *port = container_of(
> + chip->dev, struct usb_serial_port, dev);
> + struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
> + struct f81534_serial_private *serial_priv =
> + usb_get_serial_data(port->serial);
> + int current_mode;
> + int status;
> +
> + status = mutex_lock_interruptible(&serial_priv->change_mode_mutex);
> + if (status) {
> + dev_err(&port->dev, "%s: interrupted!\n", __func__);
> + return;
> + }
> +
> + current_mode = port_priv->port_pin_data.gpio_mode;
> + current_mode &= ~BIT(gpio_num);
> + current_mode |= val ? BIT(gpio_num) : 0;
> +
> + status = f81534_switch_gpio_mode(port, current_mode);
> + if (status) {
> + dev_err(&port->dev, "%s: set gpio error!!\n", __func__);
> + goto out;
> + }
> +
> + dev_dbg(&port->dev, "%s: num: %d, val:%d\n", __func__, gpio_num, val);
> + port_priv->port_pin_data.gpio_mode = current_mode;
> +
> +out:
> + mutex_unlock(&serial_priv->change_mode_mutex);
> + f81534_wakeup_all_port(port->serial);
> +}
> +
> +static int f81534_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
> +{
> + /* F81532/534 provide output only output port */
> + return GPIOF_DIR_OUT;
> +}
> +
> +static int f81534_gpio_request(struct gpio_chip *chip, unsigned offset)
> +{
> + struct usb_serial_port *port = container_of(
> + chip->dev, struct usb_serial_port, dev);
> + struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
> +
> + /* add current actives gpio */
> + atomic_inc(&port_priv->gpio_active);
> + return 0;
> +}
> +
> +static void f81534_gpio_free(struct gpio_chip *chip, unsigned offset)
> +{
> + struct usb_serial_port *port = container_of(
> + chip->dev, struct usb_serial_port, dev);
> + struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
> + struct f81534_serial_private *serial_priv =
> + usb_get_serial_data(port->serial);
> + int status;
> +
> + /* if no current actives gpio, save to IC */
> + if (atomic_dec_return(&port_priv->gpio_active) != 0)
> + return;
> +
> + status = mutex_lock_interruptible(&serial_priv->change_mode_mutex);
> + if (status) {
> + dev_err(&port->dev, "%s: interrupted!\n", __func__);
> + return;
> + }
> +
> + f81534_save_configure_data(port);
> +
> + mutex_unlock(&serial_priv->change_mode_mutex);
> + f81534_wakeup_all_port(port->serial);
> +}
> +
> +static struct gpio_chip f81534_gpio_chip_templete = {
> + .owner = THIS_MODULE,
> + .get_direction = f81534_gpio_get_direction,
> + .get = f81534_gpio_get,
> + .direction_input = f81534_gpio_direction_in,
> + .set = f81534_gpio_set,
> + .direction_output = f81534_gpio_direction_out,
> + .request = f81534_gpio_request,
> + .free = f81534_gpio_free,
> + .ngpio = 3, /*M0(SD)/M1/M2*/
> + .base = -1,
> +};
> +
> +static void f81534_wakeup_all_port(struct usb_serial *serial)
> +{
> + int i;
> + int status;
> +
> + for (i = 0; i < serial->num_ports; ++i) {
> + if (serial->port[i]) {
> + status = f81534_submit_writer(serial->port[i],
> + GFP_KERNEL);
> + if (status) {
> + dev_err(&serial->port[i]->dev,
> + "%s: submit failed\n",
> + __func__);
> + }
> + }
> + }
> +}
> +
> +static int f81534_calc_baud_divisor(u32 baudrate, u32 clockrate, u32 *remain)
> +{
> + u32 divisor, rem;
> +
> + if (!baudrate)
> + return 0;
> +
> + rem = clockrate % baudrate;
> +
> + if (remain)
> + *remain = rem;
> +
> + /* Round to nearest divisor */
> + divisor = DIV_ROUND_CLOSEST(clockrate, baudrate);
> +
> + return divisor;
> +}
> +
> +static int f81534_get_normal_register(struct usb_device *dev, u16 reg,
> + u8 *data)
> +{
> + int 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) {
> + if (status == 0)
> + status = -EIO;
> + } else {
> + break;
> + }
> + }
> +
> + if ((count <= 0) && (status <= 0)) {
> + dev_err(&dev->dev, "%s ERROR reg:%x status:%i failed\n",
> + __func__, reg, status);
> + kfree(tmp);
> + return status;
> + }
> +
> + *data = *tmp;
> + kfree(tmp);
> + return 0;
> +}
> +
> +static int f81534_get_normal_register_with_delay(struct usb_serial *usbserial,
> + u16 reg, u8 *data)
> +{
> + int status;
> + struct usb_device *dev = usbserial->dev;
> +
> + status = f81534_get_normal_register(dev, reg, data);
> + if (status)
> + return status;
> +
> + status = f81534_command_delay(usbserial);
> + if (status)
> + return status;
> +
> + return 0;
> +}
> +
> +static int f81534_set_normal_register(struct usb_device *dev, u16 reg, u8 data)
> +{
> + int count = F81534_USB_MAX_RETRY;
> + int status = 0;
> + 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) {
> + if (status == 0)
> + status = -EIO;
> + } else {
> + break;
> + }
> + }
> +
> + if ((count <= 0) && status) {
> + dev_err(&dev->dev,
> + "%s ERROR reg:%x data:0x%x status:%i failed\n",
> + __func__, reg, data, status);
> + kfree(tmp);
> + return status;
> + }
> +
> + kfree(tmp);
> + return 0;
> +}
> +
> +static int f81534_set_normal_register_with_delay(struct usb_serial *usbserial,
> + u16 reg, u8 data)
> +{
> + int status;
> + struct usb_device *dev = usbserial->dev;
> +
> + status = f81534_set_normal_register(dev, reg, data);
> + if (status)
> + return status;
> +
> + status = f81534_command_delay(usbserial);
> + if (status)
> + return status;
> +
> + return 0;
> +}
> +
> +static int f81534_setregister(struct usb_device *dev, u8 uart, u16 reg,
> + u8 data)
> +{
> + int status;
> +
> + status = f81534_set_normal_register(dev, reg + uart * 0x10, data);
> + if (status)
> + return status;
> +
> + return 0;
> +}
> +
> +static int f81534_set_port_config(struct usb_device *dev, u8 port_number,
> + struct usb_serial_port *port,
> + u32 baudrate, u16 lcr)
> +{
> + struct usb_serial *serial = port->serial;
> + struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
> + u16 device_port = port_priv->phy;
> + u32 divisor;
> + u32 rem, baud_base;
> + int status, count;
> + u8 value;
> + bool is_485_mode = false;
> + bool is_need_invert = false;
> + static u32 const baudrate_table[3] = { 1500000, 1152000, 921600};
> + static u8 const clock_table[3] = { 0x05, 0x03, 0x07};
> +
> + switch (port_priv->port_pin_data.force_uart_mode) {
> + case uart_mode_rs232:
> + case uart_mode_shutdown:
> + case uart_mode_rs232_coexist:
> + case uart_mode_invalid:
> + break;
> +
> + case uart_mode_rs485:
> + is_need_invert = true;
> + default:
> + is_485_mode = true;
> + break;
> + }
> +
> + if (baudrate <= 115200) {
> + value = 0x01; /* 1.846m fixed */
> + divisor = f81534_calc_baud_divisor(baudrate, 115200, NULL);
> + port_priv->current_baud_base = 115200;
> + } else {
> + for (count = 0; count < ARRAY_SIZE(baudrate_table) ; ++count) {
> + baud_base = baudrate_table[count];
> + divisor = f81534_calc_baud_divisor(baudrate, baud_base,
> + &rem);
> + if (!rem) {
> + dev_dbg(&port->dev, "%s: found clockbase %d\n",
> + __func__,
> + baudrate_table[count]);
> + value = clock_table[count];
> + port_priv->current_baud_base = baud_base;
> + break;
> + }
> + }
> +
> + if (count >= ARRAY_SIZE(baudrate_table)) {
> + dev_err(&port->dev,
> + "%s: cant find suitable clockbase\n",
> + __func__);
> + return -EINVAL;
> + }
> + }
> +
> + value &= ~(F81534_RS485_MODE | F81534_RS485_INVERT);
> + value |= is_485_mode ? F81534_RS485_MODE : 0;
> + value |= is_need_invert ? F81534_RS485_INVERT : 0;
> +
> + status = f81534_setregister(serial->dev, device_port, CLK_SEL_REGISTER,
> + value);
> + if (status) {
> + dev_err(&port->dev, "%s: CLK REG setting failed\n", __func__);
> + return status;
> + }
> +
> + if (baudrate <= 1200)
> + value = F81534_1X_RXTRIGGER; /* 128 FIFO & TL: 1x */
> + else
> + value = F81534_8X_RXTRIGGER; /* 128 FIFO & TL: 8x */
> +
> + status = f81534_setregister(serial->dev, device_port, CONFIG1_REGISTER,
> + 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 if (baudrate >= 1152000)
> + value = UART_FCR_R_TRIG_10 | UART_FCR_ENABLE_FIFO; /* TL: 8 */
> + else
> + value = UART_FCR_R_TRIG_11 | UART_FCR_ENABLE_FIFO; /* TL: 14 */
> +
> + status = f81534_setregister(serial->dev, device_port,
> + FIFO_CONTROL_REGISTER, value);
> + if (status) {
> + dev_err(&port->dev, "%s: FCR setting failed\n", __func__);
> + return status;
> + }
> +
> + value = UART_LCR_DLAB;
> + status = f81534_setregister(serial->dev, device_port,
> + LINE_CONTROL_REGISTER, value);
> + if (status) {
> + dev_err(&port->dev, "%s: set LCR failed, %d\n", __func__,
> + status);
> + return status;
> + }
> +
> + value = divisor & 0xFF;
> + status = f81534_setregister(serial->dev, device_port,
> + DIVISOR_LATCH_LSB, value);
> + if (status) {
> + dev_err(&port->dev, "%s: set DLAB LSB failed, %d\n", __func__,
> + status);
> + return status;
> + }
> +
> + value = (divisor >> 8) & 0xFF;
> + status = f81534_setregister(serial->dev, device_port,
> + DIVISOR_LATCH_MSB, value);
> + if (status) {
> + dev_err(&port->dev, "%s: set DLAB MSB failed, %d\n", __func__,
> + status);
> + return status;
> + }
> +
> + status = f81534_setregister(serial->dev, device_port,
> + LINE_CONTROL_REGISTER, lcr);
> + if (status) {
> + dev_err(&port->dev, "%s: set LCR failed, %d\n", __func__,
> + status);
> + return status;
> + }
> +
> + return 0;
> +}
> +
> +static int f81534_getregister(struct usb_device *dev, u8 uart, u16 reg,
> + u8 *data)
> +{
> + int status;
> +
> + status = f81534_get_normal_register(dev, reg + uart * 0x10, data);
> + if (status)
> + return status;
> +
> + return 0;
> +}
> +
> +static int f81534_update_mctrl(struct usb_serial_port *port, unsigned int set,
> + unsigned int clear)
> +{
> + struct usb_device *dev = port->serial->dev;
> + struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
> + u8 tmp;
> + int status;
> +
> + status = mutex_lock_interruptible(&port_priv->msr_mutex);
> + if (status) {
> + dev_info(&port->dev, "%s: interrupted!\n", __func__);
> + return status;
> + }
> +
> + if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
> + dev_dbg(&dev->dev, "%s -DTR|RTS not being set|cleared\n",
> + __func__);
> + mutex_unlock(&port_priv->msr_mutex);
> + return 0; /* no change */
> + }
> +
> + /* '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;
> + dev_dbg(&dev->dev, "%s: port:%d clear DTR\n", __func__,
> + port_priv->phy);
> + }
> +
> + if (clear & TIOCM_RTS) {
> + tmp &= ~UART_MCR_RTS;
> + dev_dbg(&dev->dev, "%s: port:%d clear RTS\n", __func__,
> + port_priv->phy);
> +
> + }
> +
> + if (set & TIOCM_DTR) {
> + tmp |= UART_MCR_DTR;
> + dev_dbg(&dev->dev, "%s: port:%d set DTR\n", __func__,
> + port_priv->phy);
> +
> + }
> +
> + if (set & TIOCM_RTS) {
> + tmp |= UART_MCR_RTS;
> + dev_dbg(&dev->dev, "%s: port:%d set RTS\n", __func__,
> + port_priv->phy);
> + }
> +
> + status = f81534_setregister(dev, port_priv->phy,
> + MODEM_CONTROL_REGISTER, tmp);
> + if (status < 0) {
> + dev_err(&port->dev, "%s- Error from MODEM_CTRL URB: %i\n",
> + __func__, status);
> + mutex_unlock(&port_priv->msr_mutex);
> + return status;
> + }
> +
> + port_priv->shadow_mcr = tmp;
> + mutex_unlock(&port_priv->msr_mutex);
> + return 0;
> +}
> +
> +/*
> + * This function will search the data area with token F81534_CUSTOM_VALID_TOKEN
> + * for latest configuration index. If nothing found (*index = -1), the caller
> + * will load default configure in F81534_DEF_CONF_ADDRESS_START section
> + */
> +static int f81534_find_config_idx(struct usb_serial *serial, uintptr_t *index)
> +{
> + int idx, status;
> + u8 custom_data;
> + int offset;
> +
> + for (idx = F81534_CUSTOM_MAX_IDX - 1; idx >= 0; --idx) {
> + offset = F81534_CUSTOM_ADDRESS_START +
> + F81534_CUSTOM_DATA_SIZE * idx;
> + status = f81534_read_data(serial, offset, 1, &custom_data);
> + if (status) {
> + dev_err(&serial->dev->dev,
> + "%s: read error, idx:%d, status:%d\n",
> + __func__, idx, status);
> + return status;
> + }
> +
> + /*
> + * if had custom setting, override
> + * 1st byte is a indicator, 0xff is empty, 0xf0 is had data
> + */
> +
> + /* found */
> + if (custom_data == F81534_CUSTOM_VALID_TOKEN)
> + break;
> + }
> +
> + *index = idx;
> + return 0;
> +}
> +
> +static int f81534_calc_num_ports(struct usb_serial *serial)
> +{
> + uintptr_t setting_idx;
> + int i;
> + u8 num_port = 0;
> + int status;
> + unsigned char setting[F81534_CUSTOM_DATA_SIZE + 1];
> +
> + /* check had custom setting */
> + status = f81534_find_config_idx(serial, &setting_idx);
> + if (status) {
> + dev_err(&serial->dev->dev,
> + "%s: f81534_find_config_idx read failed!!\n",
> + __func__);
> + return 0;
> + }
> +
> + /* Save the configuration area idx as private data for attach() */
> + usb_set_serial_data(serial, (void *) setting_idx);
> +
> + /* read default board setting */
> + status = f81534_read_data(serial, F81534_DEF_CONF_ADDRESS_START,
> + F81534_NUM_PORT, setting);
> + if (status) {
> + dev_err(&serial->dev->dev,
> + "%s: f81534_read_data read failed!!\n",
> + __func__);
> + return 0;
> + }
> +
> + /*
> + * if had custom setting, override it.
> + * 1st byte is a indicator, 0xff is empty, F81534_CUSTOM_VALID_TOKEN
> + * is had data, then skip with 1st data
> + */
> + if (setting_idx != F81534_CUSTOM_NO_CUSTOM_DATA) {
> + status = f81534_read_data(serial,
> + F81534_CUSTOM_ADDRESS_START +
> + F81534_CUSTOM_DATA_SIZE *
> + setting_idx + 1, sizeof(setting),
> + setting);
> + if (status) {
> + dev_err(&serial->dev->dev,
> + "%s: get custom data failed!!\n",
> + __func__);
> + return 0;
> + }
> +
> + dev_info(&serial->dev->dev,
> + "%s: read configure from block:%d\n", __func__,
> + (int) setting_idx);
> + } else {
> + dev_info(&serial->dev->dev, "%s: read configure default\n",
> + __func__);
> + }
> +
> + for (i = 0; i < F81534_NUM_PORT; ++i) {
> + /*
> + * For older configuration use. We'll transform it to newer
> + * setting after load it with final port probed.
> + */
> + switch (setting[i]) {
> + case F81534_OLD_CONFIG_37:
> + case F81534_OLD_CONFIG_38:
> + case F81534_OLD_CONFIG_39:
> + num_port += 1;
> + break;
> + }
> + }
> +
> + if (num_port) {
> + dev_dbg(&serial->dev->dev, "%s: old style with %d ports",
> + __func__, num_port);
> + return num_port;
> + }
> +
> + /* new style, find all possible ports */
> + num_port = 0;
> + for (i = 0; i < F81534_NUM_PORT; ++i) {
> + if (setting[i] & F81534_PORT_UNAVAILABLE)
> + continue;
> +
> + num_port += 1;
> + }
> +
> + if (num_port)
> + return num_port;
> +
> + dev_err(&serial->dev->dev, "Read Failed!!, default 4 ports\n");
> + 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)
> +{
> + struct usb_device *dev = port->serial->dev;
> + struct f81534_port_private *port_priv;
> + u32 baud;
> + u16 new_lcr = 0;
> + int status;
> +
> + port_priv = usb_get_serial_port_data(port);
> +
> + 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) {
> + /* Our device is not support for 1Mbps baudrate */
> + if ((baud == 1000000) || (baud > F81534_MAX_BAUDRATE)) {
> + if (old_termios)
> + baud = old_termios->c_ospeed;
> + else
> + baud = F81534_DEFAULT_BAUD_RATE;
> + }
> +
> + dev_dbg(&dev->dev, "%s-baud: %d\n", __func__, baud);
> + tty_encode_baud_rate(tty, baud, baud);
> +
> + port_priv->current_baud_rate = baud;
> + }
> +
> + port_priv->shadow_lcr = new_lcr;
> + status = f81534_set_port_config(dev, port_priv->phy, port,
> + port_priv->current_baud_rate, new_lcr);
> + if (status < 0)
> + dev_err(&port->dev, "%s - f81534_set_port_config failed: %i\n",
> + __func__, status);
> +
> + /* Re-Enable writer for to check H/W flow Control */
> + status = f81534_submit_writer(port, GFP_KERNEL);
> + if (status)
> + dev_err(&port->dev, "%s: submit failed\n", __func__);
> +}
> +
> +static int f81534_prepare_gpio(struct usb_serial_port *port)
> +{
> + struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
> + int max_name = 32;
> + char *name = NULL;
> + int idx = port->minor;
> + int rc;
> +
> + name = devm_kzalloc(&port->dev, max_name, GFP_KERNEL);
> + if (!name)
> + return -ENOMEM;
> +
> + memcpy(&port_priv->f81534_gpio_chip, &f81534_gpio_chip_templete,
> + sizeof(f81534_gpio_chip_templete));
> +
> + snprintf(name, max_name - 1, "%s-%d", IC_NAME, idx);
> +
> + port_priv->f81534_gpio_chip.label = name;
> + port_priv->f81534_gpio_chip.dev = &port->dev;
> +
> + rc = gpiochip_add(&port_priv->f81534_gpio_chip);
> + if (rc) {
> + dev_err(&port->dev, "%s: f81534_prepare_gpio failed:%d\n",
> + __func__, rc);
> + return rc;
> + }
> +
> + return 0;
> +}
> +
> +static int f81534_release_gpio(struct usb_serial_port *port)
> +{
> + struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
> +
> + gpiochip_remove(&port_priv->f81534_gpio_chip);
> + 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 phy = port_priv->phy;
> +
> + if (tty)
> + f81534_set_termios(tty, port, &tty->termios);
> +
> + atomic_inc(&serial_priv->port_active[phy]);
> + return 0;
> +}
> +
> +static void f81534_close(struct usb_serial_port *port)
> +{
> + int i;
> + unsigned long flags;
> + 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 phy = port_priv->phy;
> +
> + atomic_dec(&serial_priv->port_active[phy]);
> +
> + /* referenced from usb_serial_generic_close() */
> + for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
> + usb_kill_urb(port->write_urbs[i]);
> +
> + spin_lock_irqsave(&port->lock, flags);
> + kfifo_reset_out(&port->write_fifo);
> + spin_unlock_irqrestore(&port->lock, flags);
> +}
> +
> +static void f81534_disconnect(struct usb_serial *serial)
> +{
> + int i;
> + struct usb_serial_port *port0 = serial->port[0];
> +
> + for (i = 0; i < ARRAY_SIZE(port0->read_urbs); ++i)
> + usb_kill_urb(port0->read_urbs[i]);
> +}
> +
> +static void f81534_release(struct usb_serial *serial)
> +{
> + struct f81534_serial_private *serial_priv =
> + usb_get_serial_data(serial);
> +
> + kfree(serial_priv);
> +}
> +
> +static int f81534_get_serial_info(struct usb_serial_port *port,
> + struct serial_struct __user *retinfo)
> +{
> + struct serial_struct tmp;
> + struct f81534_port_private *port_priv;
> +
> + port_priv = usb_get_serial_port_data(port);
> + if (!port_priv)
> + return -EFAULT;
> +
> + if (!retinfo)
> + return -EFAULT;
> +
> + memset(&tmp, 0, sizeof(tmp));
> +
> + tmp.type = PORT_16550A;
> + tmp.port = port->port_number;
> + tmp.line = port->minor;
> + tmp.baud_base = port_priv->current_baud_base;
> +
> + if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
> + return -EFAULT;
> +
> + return 0;
> +}
> +
> +static int f81534_set_mask_normal_register(struct usb_device *dev, u16 reg,
> + u8 mask, u8 data)
> +{
> + int status;
> + u8 tmp;
> +
> + status = f81534_get_normal_register(dev, reg, &tmp);
> + if (status)
> + return status;
> +
> + tmp &= ~mask;
> + tmp |= (mask & data);
> +
> + status = f81534_set_normal_register(dev, reg, tmp);
> + if (status)
> + return status;
> +
> + return 0;
> +}
> +
> +static int f81534_switch_gpio_mode(struct usb_serial_port *port, u8 mode)
> +{
> + struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
> + int x = port_priv->phy;
> + int y;
> + int val;
> + int status;
> + int idx = (mode > F81534_PIN_SET_MAX) ? F81534_PIN_SET_DEFAULT : mode;
> + struct usb_device *dev = port->serial->dev;
> + const struct io_map_value *request_mode = f81534_mode_control[idx];
> + /* our EVB m0 sometime will print as SD(Shutdown) */
> + const struct pin_data *pins[3] = {&request_mode->port[x].m1,
> + &request_mode->port[x].m2,
> + &request_mode->port[x].m0_sd};
> +
> + if (mode > F81534_PIN_SET_MAX)
> + return -EINVAL;
> +
> + for (y = 0; y < 3; ++y) {
> + val = pins[y]->port_io.reg_bit ? 0xff : 0x00;
> + status = f81534_set_mask_normal_register(dev,
> + pins[y]->port_io.reg_address,
> + BIT(pins[y]->port_io.reg_offset), val);
> + if (status) {
> + dev_err(&port->dev, "%s: failed, index:%d\n", __func__,
> + y);
> + return status;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int f81534_set_port_mode(struct usb_serial_port *port,
> + enum uart_mode eMode)
> +{
> + int status;
> + u8 tmp;
> + struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
> +
> + if (eMode > uart_mode_invalid)
> + return -EINVAL;
> +
> + if (eMode != uart_mode_invalid) {
> + status = f81534_getregister(port->serial->dev, port_priv->phy,
> + CLK_SEL_REGISTER, &tmp);
> + if (status)
> + return status;
> +
> + tmp &= ~(F81534_RS485_MODE | F81534_RS485_INVERT);
> +
> + switch (port_priv->port_pin_data.force_uart_mode) {
> + case uart_mode_rs232:
> + case uart_mode_shutdown:
> + case uart_mode_rs232_coexist:
> + break;
> +
> + case uart_mode_rs485:
> + tmp |= (F81534_RS485_MODE | F81534_RS485_INVERT);
> + dev_dbg(&port->dev, "%s: uart_mode_rs485 URB:%x\n",
> + __func__, tmp);
> + break;
> +
> + default:
> + tmp |= F81534_RS485_MODE;
> + dev_dbg(&port->dev, "%s others URB:%x\n",
> + __func__, tmp);
> + break;
> +
> + }
> +
> + status = f81534_setregister(port->serial->dev, port_priv->phy,
> + CLK_SEL_REGISTER, tmp);
> + if (status)
> + return status;
> + }
> +
> + port_priv->port_pin_data.force_uart_mode = eMode;
> + return 0;
> +}
> +
> +static int f81534_ioctl_set_rs485(struct usb_serial_port *port,
> + struct serial_rs485 __user *arg)
> +{
> +
> + struct serial_rs485 data;
> + struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
> + struct f81534_serial_private *serial_priv =
> + usb_get_serial_data(port->serial);
> + struct usb_device *usb_dev = port->serial->dev;
> + u16 device_port = port_priv->phy;
> + int status;
> +
> + status = mutex_lock_interruptible(&serial_priv->change_mode_mutex);
> + if (status) {
> + dev_info(&port->dev, "%s: interrupted!\n", __func__);
> + return status;
> + }
> +
> + status = copy_from_user(&data, (struct serial_rs485 __user *)arg,
> + sizeof(data));
> + if (status) {
> + status = -EFAULT;
> + goto finish;
> + }

No need to do this under lock.

> +
> + if (data.flags & SER_RS485_ENABLED) {
> + if (data.flags & SER_RS485_RTS_ON_SEND) {
> + dev_dbg(&port->dev, "%s: uart_mode_rs485_1\n",
> + __func__);
> + port_priv->port_pin_data.force_uart_mode =
> + uart_mode_rs485_1;
> + } else {
> + dev_dbg(&port->dev, "%s: uart_mode_rs485\n", __func__);
> + port_priv->port_pin_data.force_uart_mode =
> + uart_mode_rs485;
> + }
> + } else {
> + dev_dbg(&port->dev, "%s: uart_mode_rs232\n", __func__);
> + port_priv->port_pin_data.force_uart_mode = uart_mode_rs232;
> + }
> +
> + status = f81534_set_port_config(usb_dev, device_port, port,
> + port_priv->current_baud_rate,
> + port_priv->shadow_lcr);
> + if (status) {
> + dev_err(&usb_dev->dev, "%s: set port error!!\n", __func__);
> + goto finish;
> + }
> +
> + status = f81534_save_configure_data(port);
> +
> +finish:
> + mutex_unlock(&serial_priv->change_mode_mutex);
> + f81534_wakeup_all_port(port->serial);
> +
> + return status;
> +}
> +
> +static int f81534_ioctl_get_rs485(struct usb_serial_port *port,
> + struct serial_rs485 __user *arg)
> +{
> + int status;
> + struct serial_rs485 data;
> + struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
> + struct f81534_serial_private *serial_priv =
> + usb_get_serial_data(port->serial);
> +
> + status = mutex_lock_interruptible(&serial_priv->change_mode_mutex);
> + if (status) {
> + dev_info(&port->dev, "%s: interrupted!\n", __func__);
> + return status;
> + }
> +
> + memset(&data, 0, sizeof(data));

No need to do this under lock.

> +
> + switch (port_priv->port_pin_data.force_uart_mode) {
> + case uart_mode_rs485:
> + dev_dbg(&port->dev, "%s: uart_mode_rs485\n", __func__);
> + data.flags = SER_RS485_ENABLED;
> + break;
> + case uart_mode_rs485_1:
> + dev_dbg(&port->dev, "%s: uart_mode_rs485_1\n", __func__);
> + data.flags = SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND;
> + break;
> + default:
> + dev_dbg(&port->dev, "%s: uart_mode_rs232\n", __func__);
> + break;
> + }
> +
> + if (copy_to_user((struct serial_rs485 *)arg, &data,
> + sizeof(struct serial_rs485)))
> + status = -EFAULT;
> +
> + mutex_unlock(&serial_priv->change_mode_mutex);
> + f81534_wakeup_all_port(port->serial);
> +
> + return status;
> +}
> +
> +static int f81534_ioctl(struct tty_struct *tty, unsigned int cmd,
> + unsigned long arg)
> +{
> + struct usb_serial_port *port = tty->driver_data;
> +
> + switch (cmd) {
> + case TIOCGRS485:
> + return f81534_ioctl_get_rs485(port,
> + (struct serial_rs485 __user *)
> + arg);
> +
> + case TIOCSRS485:
> + return f81534_ioctl_set_rs485(port,
> + (struct serial_rs485 __user *)
> + arg);
> +
> + case TIOCGSERIAL:
> + return f81534_get_serial_info(port,
> + (struct serial_struct __user *)
> + arg);
> + default:
> + break;
> + }
> +
> + return -ENOIOCTLCMD;
> +}
> +
> +static int f81534_submit_writer(struct usb_serial_port *port, gfp_t mem_flags)
> +{
> + struct usb_serial *serial = port->serial;
> + struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
> + struct f81534_serial_private *serial_priv =
> + usb_get_serial_data(serial);
> + struct tty_struct *tty;
> + struct urb *urb;
> + bool cts_status = true;
> + unsigned long flags;
> + int updating_data, result;
> +
> + tty = tty_port_tty_get(&port->port);
> + if (!tty)
> + return 0;
> +
> + /* check H/W Flow status */
> + if (C_CRTSCTS(tty)) {
> + spin_lock_irqsave(&port_priv->msr_lock, flags);
> + cts_status = !!(port_priv->shadow_msr & UART_MSR_CTS);
> + spin_unlock_irqrestore(&port_priv->msr_lock, flags);
> + }
> +
> + tty_kref_put(tty);
> +
> + if (!cts_status)
> + return 0;
> +
> + /* someone is changing setting, pause TX */
> + updating_data = mutex_is_locked(&serial_priv->change_mode_mutex);
> + if (updating_data)
> + return 0;
> +
> + /* 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 */
> + spin_lock_irqsave(&serial_priv->tx_empty_lock, flags);
> +
> + if (serial_priv->is_phy_port_not_empty[port_priv->phy]) {
> + spin_unlock_irqrestore(&serial_priv->tx_empty_lock, flags);
> + return 0;
> + }
> +
> + serial_priv->is_phy_port_not_empty[port_priv->phy] = true;
> + spin_unlock_irqrestore(&serial_priv->tx_empty_lock, flags);
> +
> + urb = port->write_urbs[0];
> + f81534_prepare_write_buffer(port, port->bulk_out_buffers[0],
> + port->bulk_out_size);
> + urb->transfer_buffer_length = F81534_WRITE_BUFFER_SIZE;
> +
> + result = usb_submit_urb(urb, mem_flags);
> + if (result) {
> + dev_err(&port->dev, "%s: submit error, result:%d\n", __func__,
> + result);
> + return result;
> + }
> +
> + return 0;
> +}
> +
> +static void f81534_process_per_serial_block(struct usb_serial_port *port,
> + unsigned char *data)
> +{
> + u8 lsr;
> + char tty_flag;
> + struct usb_serial *serial = port->serial;
> + struct f81534_serial_private *serial_priv =
> + usb_get_serial_data(serial);
> + int status;
> + int phy_port_num = data[0];
> + int read_size = 0;
> + int i;
> + unsigned long flags;
> + bool available = !!atomic_read(
> + &serial_priv->port_active[phy_port_num]);
> +
> + /*
> + * 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 device read
> + * index 4~127: serial in data block (data+lsr, must be even)
> + */
> + switch (data[1]) {
> + case F81534_TOKEN_TX_EMPTY:
> + /*
> + * We should record TX_EMPTY flag even the port is not opened
> + */
> + spin_lock_irqsave(&serial_priv->tx_empty_lock, flags);
> + serial_priv->is_phy_port_not_empty[phy_port_num] = false;
> + spin_unlock_irqrestore(&serial_priv->tx_empty_lock, flags);
> + usb_serial_port_softint(port);
> + break;
> +
> + case F81534_TOKEN_MSR_CHANGE:
> + /*
> + * We'll save MSR value when device reported even when port
> + * is not opened. If the port is not opened, the MSR will only
> + * recorded without any future process.
> + */
> + f81534_compare_msr(port, &data[3], available);
> + break;
> +
> + case F81534_TOKEN_RECEIVE:
> + read_size = data[2];
> + break;
> +
> + default:
> + dev_warn(&port->dev, "%s: unknown token:%02x\n", __func__,
> + data[1]);
> + return;
> + }
> +
> + /* if the port not had open, dont do future process */
> + if (!available)
> + return;
> +
> + /* Wakeup writer workqueue only when port is opened */
> + if (data[1] == F81534_TOKEN_TX_EMPTY) {
> + status = f81534_submit_writer(port, GFP_ATOMIC);
> + if (status)
> + dev_err(&port->dev, "%s: submit failed\n", __func__);
> + }
> +
> + if (data[1] != F81534_TOKEN_RECEIVE)
> + 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)
> +{
> + int i;
> + int phy_port_num;
> + int tty_port_num;
> + unsigned char *ch;
> + struct usb_serial *serial;
> + struct usb_serial_port *port = NULL;
> +
> + if (!urb->actual_length)
> + return;
> +
> + port = urb->context;
> + serial = port->serial;
> + ch = urb->transfer_buffer;
> +
> + for (i = 0; i < urb->actual_length; i += F81534_RECEIVE_BLOCK_SIZE) {
> + phy_port_num = ch[i];
> + tty_port_num = f81534_phy_to_logic_port(serial, phy_port_num);
> + port = serial->port[tty_port_num];
> +
> + f81534_process_per_serial_block(port, &ch[i]);
> + }
> +}
> +
> +static void f81534_write_usb_callback(struct urb *urb)
> +{
> + struct usb_serial_port *port = urb->context;
> + int status = urb->status;
> +
> + if (status) {
> + dev_warn(&port->dev, "%s - non-zero URB status: %d\n",
> + __func__, status);
> + } else {
> + usb_serial_port_softint(port);
> + }
> +}
> +
> +static int f81534_setup_urbs(struct usb_serial *serial)
> +{
> + int i = 0;
> + u8 port0_out_address;
> + int j;
> + int buffer_size;
> + struct usb_serial_port *port = NULL;
> +
> + /*
> + * In our system architecture, we had 4 or 2 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
> + */
> + 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))
> + goto failed;
> +
> + port->bulk_out_size = buffer_size;
> + port->bulk_out_endpointAddress = port0_out_address;
> +
> + for (j = 0; j < ARRAY_SIZE(port->write_urbs); ++j) {
> + set_bit(j, &port->write_urbs_free);
> +
> + port->write_urbs[j] = usb_alloc_urb(0, GFP_KERNEL);
> + if (!port->write_urbs[j])
> + goto failed;
> +
> + port->bulk_out_buffers[j] = kmalloc(buffer_size,
> + GFP_KERNEL);
> + if (!port->bulk_out_buffers[j])
> + goto failed;
> +
> + usb_fill_bulk_urb(port->write_urbs[j], serial->dev,
> + usb_sndbulkpipe(serial->dev,
> + port0_out_address),
> + port->bulk_out_buffers[j], 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;
> +failed:
> + return -ENOMEM;
> +}
> +
> +static int f81534_submit_read_urb(struct usb_serial *serial, gfp_t mem_flags)
> +{
> + int status;
> +
> + status = usb_serial_generic_submit_read_urbs(serial->port[0],
> + mem_flags);
> + if (status) {
> + dev_err(&serial->dev->dev,
> + "%s: submit read URB failed!! status:%d!!\n",
> + __func__, status);
> + return status;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * This function could be executed when
> + * 1. Port configuration change. (e.g., UART/GPIO Mode changed)
> + * 2. Old IC or configuration detected.
> + * During the port probe(), We'll check the current port is final port.
> + * If we found a old style configuration value, the
> + * f81534_load_configure_data() will transform old to new default
> + * setting to RAM, then f81534_save_configure_data() will compare the
> + * flash & RAM setting, If not the same, write it with new data with
> + * final port probe().
> + */
> +static int f81534_save_configure_data(struct usb_serial_port *port)
> +{
> + int status;
> + int count;
> + int phy;
> + int gpio_address, uart_address;
> + int offset;
> + bool reConfigure = false;
> + u8 uart_mode, gpio_mode;
> + u8 data[F81534_DEF_CONF_SIZE + 1];
> + u8 tmp[F81534_DEF_CONF_SIZE];
> + enum uart_mode current_mode;
> + struct usb_serial *serial = port->serial;
> + struct f81534_port_private *port_priv;
> + struct f81534_serial_private *serial_priv =
> + usb_get_serial_data(serial);
> +
> + /* compare memory with ic data */
> + for (count = 0; count < serial->num_ports; ++count) {
> + port_priv = usb_get_serial_port_data(serial->port[count]);
> +
> + if (!port_priv) {
> + dev_err(&port->dev, "%s: port_priv == NULL\n",
> + __func__);
> + continue;
> + }
> +
> + phy = port_priv->phy;
> +
> + if (serial_priv->setting_idx == F81534_CUSTOM_NO_CUSTOM_DATA) {
> + uart_address = F81534_DEF_CONF_ADDRESS_START + phy;
> + gpio_address = F81534_DEF_CONF_ADDRESS_START + phy +
> + F81534_CONF_SIZE;
> + } else {
> + /*
> + * if had custom setting, override
> + * 1st byte is a indicator, 0xff is empty,
> + * 0xf0 is had data. Skip with 1st data
> + */
> +
> + uart_address = F81534_CUSTOM_ADDRESS_START +
> + serial_priv->setting_idx *
> + F81534_CUSTOM_DATA_SIZE + phy +
> + F81534_CONF_OFFSET;
> +
> + gpio_address = F81534_CUSTOM_ADDRESS_START +
> + serial_priv->setting_idx *
> + F81534_CUSTOM_DATA_SIZE + phy +
> + F81534_CONF_SIZE + F81534_CONF_OFFSET;
> + }
> +
> + status = f81534_read_data(port->serial, uart_address, 1,
> + &uart_mode);
> + if (status) {
> + dev_err(&port->dev,
> + "%s: read uart data fail. status:%d\n",
> + __func__, status);
> + return status;
> + }
> +
> + status = f81534_read_data(port->serial, gpio_address, 1,
> + &gpio_mode);
> + if (status) {
> + dev_err(&port->dev,
> + "%s: read gpio data fail. status:%d\n",
> + __func__, status);
> + return status;
> + }
> +
> + if (port_priv->port_pin_data.gpio_mode != gpio_mode)
> + reConfigure = true;
> +
> + /* check uart flag */
> + if (port_priv->port_pin_data.force_uart_mode ==
> + uart_mode_rs232) {
> + if ((uart_mode & F81534_MODE_MASK) !=
> + F81534_RS232_FLAG)
> + reConfigure = true;
> + } else if (port_priv->port_pin_data.force_uart_mode ==
> + uart_mode_rs485_1) {
> + if ((uart_mode & F81534_MODE_MASK) !=
> + F81534_RS485_1_FLAG)
> + reConfigure = true;
> + } else if (port_priv->port_pin_data.force_uart_mode ==
> + uart_mode_rs485) {
> + if ((uart_mode & F81534_MODE_MASK) !=
> + F81534_RS485_FLAG)
> + reConfigure = true;
> + } else {
> + reConfigure = true;
> + }
> +
> + if (reConfigure)
> + break;
> + }
> +
> + if (serial_priv->setting_idx == F81534_CUSTOM_NO_CUSTOM_DATA) {
> + dev_info(&serial->dev->dev, "%s: force to reconfigure\n",
> + __func__);
> + } else if (!reConfigure) {
> + dev_dbg(&serial->dev->dev, "%s: update-to-date\n", __func__);
> + return 0;
> + }
> +
> + dev_info(&serial->dev->dev, "%s: updating\n", __func__);
> +
> + /* next setting block */
> + serial_priv->setting_idx =
> + (serial_priv->setting_idx + 1) % F81534_CUSTOM_MAX_IDX;
> + dev_info(&serial->dev->dev, "%s: saving to block index:%d\n", __func__,
> + serial_priv->setting_idx);
> +
> + /* erase when start block is 0 */
> + if (!serial_priv->setting_idx) {
> + dev_dbg(&serial->dev->dev, "%s: need erase\n", __func__);
> +
> + /* erase */
> + status = f81534_erase_sector(serial,
> + F81534_CUSTOM_ADDRESS_START);
> + if (status) {
> + dev_err(&port->dev,
> + "%s: erase sector failed! status:%d\n",
> + __func__, status);
> + return status;
> + }
> + } else {
> + dev_dbg(&serial->dev->dev,
> + "%s: dont need erase\n", __func__);
> + }
> +
> + /* reprogram */
> + for (count = 0; count < serial->num_ports; ++count) {
> + port_priv = usb_get_serial_port_data(serial->port[count]);
> + phy = port_priv->phy;
> + current_mode = port_priv->port_pin_data.force_uart_mode;
> + gpio_mode = port_priv->port_pin_data.gpio_mode;
> +
> + serial_priv->default_conf_data[phy + F81534_CONF_SIZE] =
> + gpio_mode;
> + serial_priv->default_conf_data[phy] &= ~(F81534_MODE_MASK);
> +
> + /* check uart flag */
> + if (current_mode == uart_mode_rs232) {
> + serial_priv->default_conf_data[phy] |=
> + F81534_RS232_FLAG;
> + } else if (current_mode == uart_mode_rs485_1) {
> + serial_priv->default_conf_data[phy] |=
> + F81534_RS485_1_FLAG;
> + } else if (current_mode == uart_mode_rs485) {
> + serial_priv->default_conf_data[phy] |=
> + F81534_RS485_FLAG;
> + } else {
> + dev_err(&serial->dev->dev,
> + "%s: current_mode error, value:%d\n",
> + __func__, current_mode);
> + }
> +
> + dev_info(&serial->dev->dev,
> + "%s: port:%d uart_mode:%x, gpio_mode:%x\n",
> + __func__, count,
> + serial_priv->default_conf_data[phy + 0],
> + gpio_mode);
> + }
> +
> + /*
> + * 1st byte is a indicator, 0xff is empty, 0xf0 is had data
> + * only write 8 bytes of total 4 port uart & gpio mode
> + * so we need write 1+8 data
> + */
> +
> + /* token of data exist */
> + data[0] = F81534_CUSTOM_VALID_TOKEN;
> + memcpy(&data[1], serial_priv->default_conf_data, F81534_DEF_CONF_SIZE);
> +
> + offset = F81534_CUSTOM_ADDRESS_START +
> + F81534_CUSTOM_DATA_SIZE * serial_priv->setting_idx;
> +
> + status = f81534_write_data(serial, offset, sizeof(data), data);
> + if (status) {
> + dev_err(&port->dev,
> + "%s: f81534_write_data failed!! status:%d\n",
> + __func__, status);
> + return status;
> + }
> +
> + /* recheck save & memory data */
> + memset(tmp, 0, sizeof(tmp));
> +
> + status = f81534_read_data(serial,
> + F81534_CUSTOM_ADDRESS_START +
> + F81534_CUSTOM_DATA_SIZE *
> + serial_priv->setting_idx + 1, sizeof(tmp),
> + tmp);
> + if (status) {
> + dev_err(&port->dev,
> + "%s: f81534_read_data failed!! status:%d\n",
> + __func__, status);
> + return status;
> + }
> +
> + for (count = 0; count < F81534_DEF_CONF_SIZE; ++count) {
> + if (tmp[count] == serial_priv->default_conf_data[count])
> + continue;
> +
> + dev_err(&port->dev,
> + "%s:read data error, count:%d, data:%x %x\n",
> + __func__, count, tmp[count],
> + serial_priv->default_conf_data[count]);
> + }
> +
> + dev_dbg(&serial->dev->dev, "%s: complete\n", __func__);
> +
> + return 0;
> +}
> +
> +static int f81534_load_configure_data(struct usb_serial_port *port)
> +{
> + int status;
> + int offset;
> + u8 uart_flag, gpio_mode;
> + struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
> + struct f81534_serial_private *serial_priv =
> + usb_get_serial_data(port->serial);
> + int device_port = port_priv->phy;
> +
> + uart_flag = serial_priv->default_conf_data[device_port];
> + gpio_mode = serial_priv->default_conf_data[device_port +
> + F81534_CONF_SIZE];
> +
> + switch (uart_flag) {
> + /*
> + * For older configuration use. We'll transform it to newer setting
> + * after load it with final port probed.
> + */
> + case F81534_OLD_CONFIG_37:
> + case F81534_OLD_CONFIG_38:
> + case F81534_OLD_CONFIG_39:
> + offset = device_port + F81534_CONF_SIZE;
> + serial_priv->default_conf_data[device_port] =
> + F81534_RS232_FLAG;
> + gpio_mode = serial_priv->default_conf_data[offset] =
> + F81534_PIN_SET_DEFAULT;
> + port_priv->port_pin_data.force_uart_mode = uart_mode_rs232;
> + port_priv->port_pin_data.gpio_mode = F81534_PIN_SET_DEFAULT;
> + dev_info(&port->dev, "transceiver setting need upgrading\n");
> + break;
> +
> + /* MP style setting */
> + default:
> + if (uart_flag & F81534_PORT_CONF_RS485) {
> + if (uart_flag & F81534_PORT_CONF_RS485_INVERT)
> + port_priv->port_pin_data.force_uart_mode =
> + uart_mode_rs485;
> + else
> + port_priv->port_pin_data.force_uart_mode =
> + uart_mode_rs485_1;
> + } else {
> + port_priv->port_pin_data.force_uart_mode =
> + uart_mode_rs232;
> + }
> +
> + break;
> + }
> +
> + if ((gpio_mode >= F81534_PIN_SET_MIN) &&
> + (gpio_mode <= F81534_PIN_SET_MAX)) {
> + port_priv->port_pin_data.gpio_mode = gpio_mode;
> + dev_dbg(&port->dev, "gpio set to %d\n", gpio_mode);
> + } else {
> + port_priv->port_pin_data.gpio_mode = F81534_PIN_SET_DEFAULT;
> + dev_info(&port->dev, "unknown gpio %d, setting to %d\n",
> + gpio_mode, F81534_PIN_SET_DEFAULT);
> + }
> +
> + status =
> + f81534_switch_gpio_mode(port, port_priv->port_pin_data.gpio_mode);
> + if (status) {
> + dev_err(&port->dev,
> + "%s: switch gpio mode failed!! status:%d\n",
> + __func__, status);
> + return status;
> + }
> +
> + return 0;
> +}
> +
> +static void dump_configure(struct usb_serial *serial)
> +{
> + unsigned char transceiver, mode;
> + int count;
> + int index;
> + int gpio_address, uart_address;
> + struct f81534_serial_private *serial_priv =
> + usb_get_serial_data(serial);
> +
> + index = serial_priv->setting_idx;
> +
> + for (count = 0; count < 4; ++count) {
> + if (index == F81534_CUSTOM_NO_CUSTOM_DATA) {
> + uart_address = F81534_DEF_CONF_ADDRESS_START + count;
> + gpio_address = F81534_DEF_CONF_ADDRESS_START + count +
> + F81534_CONF_SIZE;
> + } else {
> +
> + /*
> + * if had custom setting, override
> + * 1st byte is a indicator.
> + * 0xff is empty, 0xf0 is had data.
> + * read and skip with 1st data.
> + */
> +
> + uart_address = F81534_CUSTOM_ADDRESS_START +
> + F81534_CUSTOM_DATA_SIZE * index +
> + count + F81534_CONF_OFFSET;
> +
> + gpio_address = F81534_CUSTOM_ADDRESS_START +
> + F81534_CUSTOM_DATA_SIZE * index +
> + count + F81534_CONF_SIZE +
> + F81534_CONF_OFFSET;
> + }
> +
> + f81534_read_data(serial, uart_address, 1, &transceiver);
> + f81534_read_data(serial, gpio_address, 1, &mode);
> +
> + dev_info(&serial->dev->dev,
> + "%s: port:%d uart_flag:%x gpio:%x\n", __func__,
> + count, transceiver, mode);
> + }
> +}
> +
> +static int f81534_attach(struct usb_serial *serial)
> +{
> + struct f81534_serial_private *serial_priv = NULL;
> + int status;
> + int i;
> + int offset;
> + uintptr_t setting_idx = (uintptr_t) usb_get_serial_data(serial);
> +
> + serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
> + if (!serial_priv)
> + return -ENOMEM;
> +
> + usb_set_serial_data(serial, serial_priv);
> + serial_priv->setting_idx = setting_idx;
> +
> + for (i = 0; i < F81534_NUM_PORT; ++i) {
> + /* Disable all interrupt before submit URB */
> + status = f81534_setregister(serial->dev, i,
> + INTERRUPT_ENABLE_REGISTER, 0x00);
> + if (status) {
> + dev_err(&serial->dev->dev, "%s: IER disable failed\n",
> + __func__);
> + goto failed;
> + }
> + }
> +
> + for (i = 0; i < F81534_NUM_PORT; ++i)
> + atomic_set(&serial_priv->port_active[i], 0);

Should be ATOMIC_INIT()

> +
> + spin_lock_init(&serial_priv->tx_empty_lock);
> + mutex_init(&serial_priv->change_mode_mutex);
> +
> + status = f81534_setup_urbs(serial);
> + if (status)
> + goto failed;
> +
> + /*
> + * The configuration layout:
> + * byte 0/1/2/3: uart setting
> + * byte 4/5/6/7: gpio setting
> + *
> + * We can reference from f81534_load_configure_data().
> + */
> + status = f81534_read_data(serial, F81534_DEF_CONF_ADDRESS_START,
> + F81534_DEF_CONF_SIZE,
> + serial_priv->default_conf_data);
> + if (status) {
> + dev_err(&serial->dev->dev, "%s read reserve data failed\n",
> + __func__);
> + goto failed;
> + }
> +
> + /*
> + * if had custom setting, override
> + * 1st byte is a indicator, 0xff is empty, 0xf0 is had data
> + * skip with 1st data
> + *
> + * if serial_priv->setting_idx == F81534_CUSTOM_NO_CUSTOM_DATA
> + * it's mean for no configuration is custom section, so we'll use
> + * default config read from F81534_DEF_CONF_ADDRESS_START
> + */
> + if (serial_priv->setting_idx == F81534_CUSTOM_NO_CUSTOM_DATA)
> + return 0;
> +
> + offset = F81534_CUSTOM_ADDRESS_START +
> + F81534_CUSTOM_DATA_SIZE * serial_priv->setting_idx + 1;
> + /* only read 8 bytes for mode & GPIO */
> + status = f81534_read_data(serial, offset,
> + sizeof(serial_priv->default_conf_data),
> + serial_priv->default_conf_data);
> + if (status) {
> + dev_err(&serial->dev->dev,
> + "%s: get data failed, idx:%d, status:%d!!\n",
> + __func__, serial_priv->setting_idx, status);
> + goto failed;
> + }
> +
> + /*
> + * We'll register port 0 bulkin only once, It'll take all port received
> + * data, MSR register change and TX_EMPTY information.
> + */
> + status = f81534_submit_read_urb(serial, GFP_KERNEL);
> + if (status) {
> + dev_err(&serial->dev->dev,
> + "%s: submit read URB failed!! status:%d!!\n",
> + __func__, status);
> + goto failed;
> + }
> +
> + return 0;
> +failed:
> + kfree(serial_priv);
> + return status;
> +}
> +
> +static int f81534_init_msr(struct usb_serial_port *port)
> +{
> + int status;
> + struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
> + struct usb_serial *serial = port->serial;
> + unsigned long flags;
> + int phy = port_priv->phy;
> + u8 msr;
> +
> + /* Get MSR initial value*/
> + status = f81534_getregister(serial->dev, phy, MODEM_STATUS_REGISTER,
> + &msr);
> + if (status)
> + return status;
> +
> + 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_port_probe(struct usb_serial_port *port)
> +{
> + struct usb_serial *serial = port->serial;
> + struct f81534_serial_private *serial_priv =
> + usb_get_serial_data(serial);
> + struct f81534_port_private *port_priv = NULL;
> + int status, i, count = 0;
> + int port_index = f81534_port_index(port);
> + u8 ier = UART_IER_MSI | UART_IER_RLSI | UART_IER_THRI | UART_IER_RDI |
> + IER_DMA_TX_EN | IER_DMA_RX_EN;
> +
> + port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
> + if (!port_priv)
> + return -ENOMEM;
> +
> + atomic_set(&port_priv->gpio_active, 0);

Should use ATOMIC_INIT()

> + spin_lock_init(&port_priv->msr_lock);
> + mutex_init(&port_priv->msr_mutex);
> +
> + /* assign logic-to-phy mapping */
> + port_priv->phy = F81534_UNUSED_PORT;
> +
> + for (i = 0; i < F81534_NUM_PORT; ++i) {
> + if (serial_priv->default_conf_data[i] &
> + F81534_PORT_UNAVAILABLE)
> + continue;
> +
> + if (port_index == count) {
> + port_priv->phy = i;
> + break;
> + }
> +
> + count += 1;
> + }
> +
> + if (port_priv->phy == F81534_UNUSED_PORT) {
> + status = -ENODEV;
> + goto port_fail;
> + }
> +
> + usb_set_serial_port_data(port, port_priv);
> + dev_dbg(&port->dev, "%s: mapping to phy: %d\n", __func__,
> + port_priv->phy);
> +
> + /*
> + * We'll read MSR reg only with port_porbe() for initial, then the MSR
> + * will received from read URB with token F81534_TOKEN_MSR_CHANGE.
> + *
> + * This driver will save the MSR reported from device even port is not
> + * opened. If the port is opened, we'll do normal process of MSR
> + * changed. otherwise we'll just save the MSR.
> + */
> + status = f81534_init_msr(port);
> + if (status)
> + goto port_fail;
> +
> + /* Enable all interrupt after submit URB */
> + status = f81534_setregister(serial->dev, port_priv->phy,
> + INTERRUPT_ENABLE_REGISTER, ier);
> + if (status) {
> + dev_err(&serial->dev->dev, "%s: IER enable failed\n",
> + __func__);
> + goto port_fail;
> + }
> +
> + status = f81534_prepare_gpio(port);
> + if (status)
> + goto port_fail;
> +
> + status = f81534_load_configure_data(port);
> + if (status)
> + goto port_fail;
> +
> + /*
> + * Driver will compare memory & flash configure. If it not the same,
> + * We'll save it when final port probed.
> + */
> + if ((serial->num_ports - 1) == f81534_port_index(port)) {
> + f81534_save_configure_data(port);
> + dump_configure(serial);
> + }
> +
> + status = f81534_set_port_mode(port,
> + port_priv->port_pin_data.force_uart_mode);
> + if (status < 0) {
> + dev_err(&port->dev, "%s: initial setup failed phy: (%i)\n",
> + __func__, port_priv->phy);
> + goto port_fail;
> + }
> +
> + return 0;
> +
> +port_fail:
> + dev_err(&port->dev, "%s: failed, %d\n", __func__, status);
> + kfree(port_priv);
> + return status;
> +}
> +
> +static int f81534_port_remove(struct usb_serial_port *port)
> +{
> + struct f81534_port_private *port_priv;
> +
> + f81534_release_gpio(port);
> + port_priv = usb_get_serial_port_data(port);
> + kfree(port_priv);
> + return 0;
> +}
> +
> +static void f81534_compare_msr(struct usb_serial_port *port, u8 *msr,

Is the point of passing a pointer to msr locking?

> + bool is_port_open)
> +{
> + u8 old_msr;
> + struct tty_struct *tty = NULL;
> + struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
> + unsigned long flags;
> + int status;
> +
> + 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);
> +

Why can you access *msr without locking?

> + if ((*msr & (UART_MSR_CTS | UART_MSR_DCTS)) ==
> + (UART_MSR_CTS | UART_MSR_DCTS)) {
> + /* CTS changed, wakeup writer to re-check flow control */
> + if (is_port_open) {
> + status = f81534_submit_writer(port, GFP_ATOMIC);
> + if (status) {
> + dev_err(&port->dev, "%s: submit failed\n",
> + __func__);
> + }
> + }
> + dev_dbg(&port->dev, "%s: CTS Flag changed, value: %x\n",
> + __func__, !!(*msr & UART_MSR_CTS));
> + }
> +
> + dev_dbg(&port->dev, "%s: MSR from %02x to %02x\n", __func__, old_msr,
> + *msr);
> +
> + if (!is_port_open)
> + return;
> +
> + /* 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: port %d from %x to %x.\n",
> + __func__, port_priv->phy, 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_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);
> + unsigned long flags;
> + int r;
> + u8 msr, mcr;
> +
> + /*
> + * We'll avoid to direct read MSR register. The IC will read the MSR
> + * changed and report it f81534_process_per_serial_block() by
> + * F81534_TOKEN_MSR_CHANGE.
> + *
> + * When this device in heavy loading (e.g., BurnInTest Loopback Test)
> + * The report of MSR register will delay received a bit. It's due to
> + * MSR interrupt is lowest priority in 16550A. So we decide to sleep
> + * a little time to pass the test.
> + */
> + if (schedule_timeout_interruptible(
> + msecs_to_jiffies(F81534_DELAY_READ_MSR))) {
> + dev_info(&port->dev, "%s: breaked !!\n", __func__);
> + }

Is the delay necessary or isn't it?
If it is necessary you should do something about the signal.

> +
> + mutex_lock(&port_priv->msr_mutex);
> + spin_lock_irqsave(&port_priv->msr_lock, flags);
> +
> + msr = port_priv->shadow_msr;
> + mcr = port_priv->shadow_mcr;
> +
> + spin_unlock_irqrestore(&port_priv->msr_lock, flags);
> + mutex_unlock(&port_priv->msr_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_prepare_write_buffer(struct usb_serial_port *port,
> + void *dest, size_t size)
> +{
> + unsigned char *ptr = (unsigned char *) dest;
> + struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
> + int port_num = port_priv->phy;
> + struct usb_serial *serial = port->serial;
> +
> + WARN_ON(size != serial->port[0]->bulk_out_size);
> +
> + if (size != F81534_WRITE_BUFFER_SIZE) {
> + WARN_ON(size != F81534_WRITE_BUFFER_SIZE);

What is the sense of this?

> + return 0;
> + }
> +
> + /*
> + * The block layout is fixed with 4x128 Bytes, per 128 Bytes
> + * for a port.
> + * index 0: port phy idx (e.g., 0,1,2,3)
> + * index 1: only F81534_TOKEN_WRITE
> + * index 2: serial out size
> + * index 3: fix to 0
> + * index 4~127: serial out data block
> + */
> + ptr[F81534_RECEIVE_BLOCK_SIZE * 0] = 0;
> + ptr[F81534_RECEIVE_BLOCK_SIZE * 1] = 1;
> + ptr[F81534_RECEIVE_BLOCK_SIZE * 2] = 2;
> + ptr[F81534_RECEIVE_BLOCK_SIZE * 3] = 3;

Either these ...

> + ptr[F81534_RECEIVE_BLOCK_SIZE * port_num + 0] = port_num;

.. or that is redundant

> + ptr[F81534_RECEIVE_BLOCK_SIZE * port_num + 1] = F81534_TOKEN_WRITE;
> + ptr[F81534_RECEIVE_BLOCK_SIZE * port_num + 3] = 0;
> + ptr[F81534_RECEIVE_BLOCK_SIZE * port_num + 2] =
> + kfifo_out_locked(&port->write_fifo,
> + &ptr[F81534_RECEIVE_BLOCK_SIZE * port_num + 4],
> + F81534_MAX_TX_SIZE, &port->lock);
> +
> + return F81534_WRITE_BUFFER_SIZE;
> +}
> +
> +static int f81534_write(struct tty_struct *tty,
> + struct usb_serial_port *port,
> + const unsigned char *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_KERNEL);
> + if (status) {
> + dev_err(&port->dev, "%s: submit failed\n", __func__);
> + return status;
> + }
> +
> + return bytes_out;
> +}
> +
> +static int f81534_resume(struct usb_serial *serial)
> +{
> + struct usb_serial_port *port;
> + int status, error = 0;
> + int i;
> +
> + status = f81534_submit_read_urb(serial, GFP_NOIO);
> + if (status) {
> + dev_err(&serial->dev->dev,
> + "%s: submit read URB failed!! status:%d!!\n",
> + __func__, status);
> + return status;
> + }
> +
> + for (i = 0; i < serial->num_ports; i++) {
> + port = serial->port[i];
> + if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags))
> + continue;
> +
> + status = f81534_submit_writer(port, GFP_NOIO);
> + if (status) {
> + dev_err(&port->dev, "%s: submit failed\n", __func__);
> + error += 1;
> + }
> + }
> +
> + return error ? -EIO : 0;
> +}
> +
> +static struct usb_serial_driver f81534_device = {
> + .driver = {
> + .owner = THIS_MODULE,
> + .name = IC_NAME,
> + },
> + .description = DRIVER_DESC,
> + .id_table = id_table,
> + .open = f81534_open,
> + .close = f81534_close,
> + .write = f81534_write,
> + .calc_num_ports = f81534_calc_num_ports,
> + .attach = f81534_attach,
> + .disconnect = f81534_disconnect,
> + .release = f81534_release,
> + .port_probe = f81534_port_probe,
> + .port_remove = f81534_port_remove,
> + .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, id_table);
> +
> +MODULE_DESCRIPTION(DRIVER_DESC);
> +MODULE_AUTHOR("Peter Hong <Peter_Hong@xxxxxxxxxxxxx>");
> +MODULE_AUTHOR("Tom Tsai <Tom_Tsai@xxxxxxxxxxxxx>");
> +MODULE_LICENSE("GPL");

--
Oliver Neukum <oneukum@xxxxxxxx>

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