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path: root/drivers/usb/serial/f81534.c
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Diffstat (limited to 'drivers/usb/serial/f81534.c')
-rw-r--r--drivers/usb/serial/f81534.c1574
1 files changed, 1574 insertions, 0 deletions
diff --git a/drivers/usb/serial/f81534.c b/drivers/usb/serial/f81534.c
new file mode 100644
index 000000000..4083ae961
--- /dev/null
+++ b/drivers/usb/serial/f81534.c
@@ -0,0 +1,1574 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * F81532/F81534 USB to Serial Ports Bridge
+ *
+ * F81532 => 2 Serial Ports
+ * F81534 => 4 Serial Ports
+ *
+ * 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 <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/usb.h>
+#include <linux/usb/serial.h>
+#include <linux/serial_reg.h>
+#include <linux/module.h>
+#include <linux/uaccess.h>
+
+/* 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_INTERRUPT_ENABLE_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_LINE_STATUS_REG (0x05 + F81534_UART_BASE_ADDRESS)
+#define F81534_MODEM_STATUS_REG (0x06 + F81534_UART_BASE_ADDRESS)
+#define F81534_CLOCK_REG (0x08 + 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 12
+
+#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_CONF_INIT_GPIO_OFFSET 4
+#define F81534_CONF_WORK_GPIO_OFFSET 8
+#define F81534_CONF_GPIO_SHUTDOWN 7
+#define F81534_CONF_GPIO_RS232 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 2000
+#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_PORT_CONF_RS232 0
+#define F81534_PORT_CONF_RS485 BIT(0)
+#define F81534_PORT_CONF_RS485_INVERT (BIT(0) | BIT(1))
+#define F81534_PORT_CONF_MODE_MASK GENMASK(1, 0)
+#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
+
+/*
+ * F81532/534 Clock registers (offset +08h)
+ *
+ * Bit0: UART Enable (always on)
+ * Bit2-1: Clock source selector
+ * 00: 1.846MHz.
+ * 01: 18.46MHz.
+ * 10: 24MHz.
+ * 11: 14.77MHz.
+ * Bit4: Auto direction(RTS) control (RTS pin Low when TX)
+ * Bit5: Invert direction(RTS) when Bit4 enabled (RTS pin high when TX)
+ */
+
+#define F81534_UART_EN BIT(0)
+#define F81534_CLK_1_846_MHZ 0
+#define F81534_CLK_18_46_MHZ BIT(1)
+#define F81534_CLK_24_MHZ BIT(2)
+#define F81534_CLK_14_77_MHZ (BIT(1) | BIT(2))
+#define F81534_CLK_MASK GENMASK(2, 1)
+#define F81534_CLK_TX_DELAY_1BIT BIT(3)
+#define F81534_CLK_RS485_MODE BIT(4)
+#define F81534_CLK_RS485_INVERT BIT(5)
+
+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;
+ struct mutex lcr_mutex;
+ struct work_struct lsr_work;
+ struct usb_serial_port *port;
+ unsigned long tx_empty;
+ spinlock_t msr_lock;
+ u32 baud_base;
+ u8 shadow_mcr;
+ u8 shadow_lcr;
+ u8 shadow_msr;
+ u8 shadow_clk;
+ u8 phy_num;
+};
+
+struct f81534_pin_data {
+ const u16 reg_addr;
+ const u8 reg_mask;
+};
+
+struct f81534_port_out_pin {
+ struct f81534_pin_data pin[3];
+};
+
+/* Pin output value for M2/M1/M0(SD) */
+static const struct f81534_port_out_pin f81534_port_out_pins[] = {
+ { { { 0x2ae8, BIT(7) }, { 0x2a90, BIT(5) }, { 0x2a90, BIT(4) } } },
+ { { { 0x2ae8, BIT(6) }, { 0x2ae8, BIT(0) }, { 0x2ae8, BIT(3) } } },
+ { { { 0x2a90, BIT(0) }, { 0x2ae8, BIT(2) }, { 0x2a80, BIT(6) } } },
+ { { { 0x2a90, BIT(3) }, { 0x2a90, BIT(2) }, { 0x2a90, BIT(1) } } },
+};
+
+static u32 const baudrate_table[] = { 115200, 921600, 1152000, 1500000 };
+static u8 const clock_table[] = { F81534_CLK_1_846_MHZ, F81534_CLK_14_77_MHZ,
+ F81534_CLK_18_46_MHZ, F81534_CLK_24_MHZ };
+
+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 == sizeof(u8)) {
+ status = 0;
+ break;
+ }
+ }
+
+ 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_mask_register(struct usb_serial *serial, u16 reg,
+ u8 mask, u8 data)
+{
+ int status;
+ u8 tmp;
+
+ status = f81534_get_register(serial, reg, &tmp);
+ if (status)
+ return status;
+
+ tmp &= ~mask;
+ tmp |= (mask & data);
+
+ return f81534_set_register(serial, reg, tmp);
+}
+
+static int f81534_set_phy_port_register(struct usb_serial *serial, int phy,
+ u16 reg, u8 data)
+{
+ return f81534_set_register(serial, reg + F81534_UART_OFFSET * phy,
+ data);
+}
+
+static int f81534_get_phy_port_register(struct usb_serial *serial, int phy,
+ u16 reg, u8 *data)
+{
+ return f81534_get_register(serial, reg + F81534_UART_OFFSET * phy,
+ data);
+}
+
+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)
+{
+ /* Round to nearest divisor */
+ return DIV_ROUND_CLOSEST(clockrate, baudrate);
+}
+
+static int f81534_find_clk(u32 baudrate)
+{
+ int idx;
+
+ for (idx = 0; idx < ARRAY_SIZE(baudrate_table); ++idx) {
+ if (baudrate <= baudrate_table[idx] &&
+ baudrate_table[idx] % baudrate == 0)
+ return idx;
+ }
+
+ return -EINVAL;
+}
+
+static int f81534_set_port_config(struct usb_serial_port *port,
+ struct tty_struct *tty, u32 baudrate, u32 old_baudrate, u8 lcr)
+{
+ struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
+ u32 divisor;
+ int status;
+ int i;
+ int idx;
+ u8 value;
+ u32 baud_list[] = {baudrate, old_baudrate, F81534_DEFAULT_BAUD_RATE};
+
+ for (i = 0; i < ARRAY_SIZE(baud_list); ++i) {
+ baudrate = baud_list[i];
+ if (baudrate == 0) {
+ tty_encode_baud_rate(tty, 0, 0);
+ return 0;
+ }
+
+ idx = f81534_find_clk(baudrate);
+ if (idx >= 0) {
+ tty_encode_baud_rate(tty, baudrate, baudrate);
+ break;
+ }
+ }
+
+ if (idx < 0)
+ return -EINVAL;
+
+ port_priv->baud_base = baudrate_table[idx];
+ port_priv->shadow_clk &= ~F81534_CLK_MASK;
+ port_priv->shadow_clk |= clock_table[idx];
+
+ status = f81534_set_port_register(port, F81534_CLOCK_REG,
+ port_priv->shadow_clk);
+ if (status) {
+ dev_err(&port->dev, "CLOCK_REG setting failed\n");
+ return status;
+ }
+
+ 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_TRIGGER_8 | UART_FCR_ENABLE_FIFO; /* TL: 8 */
+
+ 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, port_priv->baud_base);
+
+ mutex_lock(&port_priv->lcr_mutex);
+
+ 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__);
+ goto out_unlock;
+ }
+
+ 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__);
+ goto out_unlock;
+ }
+
+ 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__);
+ goto out_unlock;
+ }
+
+ value = lcr | (port_priv->shadow_lcr & UART_LCR_SBC);
+ status = f81534_set_port_register(port, F81534_LINE_CONTROL_REG,
+ value);
+ if (status) {
+ dev_err(&port->dev, "%s: set LCR failed\n", __func__);
+ goto out_unlock;
+ }
+
+ port_priv->shadow_lcr = value;
+out_unlock:
+ mutex_unlock(&port_priv->lcr_mutex);
+
+ return status;
+}
+
+static void f81534_break_ctl(struct tty_struct *tty, int break_state)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
+ int status;
+
+ mutex_lock(&port_priv->lcr_mutex);
+
+ if (break_state)
+ port_priv->shadow_lcr |= UART_LCR_SBC;
+ else
+ port_priv->shadow_lcr &= ~UART_LCR_SBC;
+
+ status = f81534_set_port_register(port, F81534_LINE_CONTROL_REG,
+ port_priv->shadow_lcr);
+ if (status)
+ dev_err(&port->dev, "set break failed: %d\n", status);
+
+ mutex_unlock(&port_priv->lcr_mutex);
+}
+
+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;
+}
+
+/*
+ * The F81532/534 will not report serial port to USB serial subsystem when
+ * H/W DCD/DSR/CTS/RI/RX pin connected to ground.
+ *
+ * To detect RX pin status, we'll enable MCR interal loopback, disable it and
+ * delayed for 60ms. It connected to ground If LSR register report UART_LSR_BI.
+ */
+static bool f81534_check_port_hw_disabled(struct usb_serial *serial, int phy)
+{
+ int status;
+ u8 old_mcr;
+ u8 msr;
+ u8 lsr;
+ u8 msr_mask;
+
+ msr_mask = UART_MSR_DCD | UART_MSR_RI | UART_MSR_DSR | UART_MSR_CTS;
+
+ status = f81534_get_phy_port_register(serial, phy,
+ F81534_MODEM_STATUS_REG, &msr);
+ if (status)
+ return false;
+
+ if ((msr & msr_mask) != msr_mask)
+ return false;
+
+ status = f81534_set_phy_port_register(serial, phy,
+ F81534_FIFO_CONTROL_REG, UART_FCR_ENABLE_FIFO |
+ UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
+ if (status)
+ return false;
+
+ status = f81534_get_phy_port_register(serial, phy,
+ F81534_MODEM_CONTROL_REG, &old_mcr);
+ if (status)
+ return false;
+
+ status = f81534_set_phy_port_register(serial, phy,
+ F81534_MODEM_CONTROL_REG, UART_MCR_LOOP);
+ if (status)
+ return false;
+
+ status = f81534_set_phy_port_register(serial, phy,
+ F81534_MODEM_CONTROL_REG, 0x0);
+ if (status)
+ return false;
+
+ msleep(60);
+
+ status = f81534_get_phy_port_register(serial, phy,
+ F81534_LINE_STATUS_REG, &lsr);
+ if (status)
+ return false;
+
+ status = f81534_set_phy_port_register(serial, phy,
+ F81534_MODEM_CONTROL_REG, old_mcr);
+ if (status)
+ return false;
+
+ if ((lsr & UART_LSR_BI) == UART_LSR_BI)
+ return true;
+
+ return false;
+}
+
+/*
+ * 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,
+ struct usb_serial_endpoints *epds)
+{
+ struct f81534_serial_private *serial_priv;
+ struct device *dev = &serial->interface->dev;
+ int size_bulk_in = usb_endpoint_maxp(epds->bulk_in[0]);
+ int size_bulk_out = usb_endpoint_maxp(epds->bulk_out[0]);
+ u8 num_port = 0;
+ int index = 0;
+ int status;
+ int i;
+
+ 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;
+ }
+
+ 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);
+
+ /* 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) {
+ 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: get custom data failed: %d\n",
+ __func__, status);
+ return status;
+ }
+
+ dev_dbg(&serial->interface->dev,
+ "%s: read config from block: %d\n", __func__,
+ serial_priv->setting_idx);
+ } else {
+ /* Read default board setting */
+ status = f81534_read_flash(serial,
+ F81534_DEF_CONF_ADDRESS_START,
+ sizeof(serial_priv->conf_data),
+ serial_priv->conf_data);
+ if (status) {
+ dev_err(&serial->interface->dev,
+ "%s: read failed: %d\n", __func__,
+ status);
+ return status;
+ }
+
+ 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 (f81534_check_port_hw_disabled(serial, i))
+ serial_priv->conf_data[i] |= F81534_PORT_UNAVAILABLE;
+
+ if (serial_priv->conf_data[i] & F81534_PORT_UNAVAILABLE)
+ continue;
+
+ ++num_port;
+ }
+
+ if (!num_port) {
+ dev_warn(&serial->interface->dev,
+ "no config found, assuming 4 ports\n");
+ num_port = 4; /* Nothing found, oldest version IC */
+ }
+
+ /* 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]);
+ }
+
+ /*
+ * Setup bulk-out endpoint multiplexing. All ports share the same
+ * bulk-out endpoint.
+ */
+ BUILD_BUG_ON(ARRAY_SIZE(epds->bulk_out) < F81534_NUM_PORT);
+
+ for (i = 1; i < num_port; ++i)
+ epds->bulk_out[i] = epds->bulk_out[0];
+
+ epds->num_bulk_out = num_port;
+
+ return num_port;
+}
+
+static void f81534_set_termios(struct tty_struct *tty,
+ struct usb_serial_port *port,
+ const struct ktermios *old_termios)
+{
+ u8 new_lcr = 0;
+ int status;
+ u32 baud;
+ u32 old_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;
+
+ new_lcr |= UART_LCR_WLEN(tty_get_char_size(tty->termios.c_cflag));
+
+ baud = tty_get_baud_rate(tty);
+ if (!baud)
+ return;
+
+ if (old_termios)
+ old_baud = tty_termios_baud_rate(old_termios);
+ else
+ old_baud = F81534_DEFAULT_BAUD_RATE;
+
+ dev_dbg(&port->dev, "%s: baud: %d\n", __func__, baud);
+
+ status = f81534_set_port_config(port, tty, baud, old_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 void f81534_get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct f81534_port_private *port_priv;
+
+ port_priv = usb_get_serial_port_data(port);
+
+ ss->baud_base = port_priv->baud_base;
+}
+
+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);
+ }
+
+ schedule_work(&port_priv->lsr_work);
+ }
+
+ if (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 void f81534_lsr_worker(struct work_struct *work)
+{
+ struct f81534_port_private *port_priv;
+ struct usb_serial_port *port;
+ int status;
+ u8 tmp;
+
+ port_priv = container_of(work, struct f81534_port_private, lsr_work);
+ port = port_priv->port;
+
+ status = f81534_get_port_register(port, F81534_LINE_STATUS_REG, &tmp);
+ if (status)
+ dev_warn(&port->dev, "read LSR failed: %d\n", status);
+}
+
+static int f81534_set_port_output_pin(struct usb_serial_port *port)
+{
+ struct f81534_serial_private *serial_priv;
+ struct f81534_port_private *port_priv;
+ struct usb_serial *serial;
+ const struct f81534_port_out_pin *pins;
+ int status;
+ int i;
+ u8 value;
+ u8 idx;
+
+ serial = port->serial;
+ serial_priv = usb_get_serial_data(serial);
+ port_priv = usb_get_serial_port_data(port);
+
+ idx = F81534_CONF_INIT_GPIO_OFFSET + port_priv->phy_num;
+ value = serial_priv->conf_data[idx];
+ if (value >= F81534_CONF_GPIO_SHUTDOWN) {
+ /*
+ * Newer IC configure will make transceiver in shutdown mode on
+ * initial power on. We need enable it before using UARTs.
+ */
+ idx = F81534_CONF_WORK_GPIO_OFFSET + port_priv->phy_num;
+ value = serial_priv->conf_data[idx];
+ if (value >= F81534_CONF_GPIO_SHUTDOWN)
+ value = F81534_CONF_GPIO_RS232;
+ }
+
+ pins = &f81534_port_out_pins[port_priv->phy_num];
+
+ for (i = 0; i < ARRAY_SIZE(pins->pin); ++i) {
+ status = f81534_set_mask_register(serial,
+ pins->pin[i].reg_addr, pins->pin[i].reg_mask,
+ value & BIT(i) ? pins->pin[i].reg_mask : 0);
+ if (status)
+ return status;
+ }
+
+ dev_dbg(&port->dev, "Output pin (M0/M1/M2): %d\n", value);
+ return 0;
+}
+
+static int f81534_port_probe(struct usb_serial_port *port)
+{
+ struct f81534_serial_private *serial_priv;
+ struct f81534_port_private *port_priv;
+ int ret;
+ u8 value;
+
+ serial_priv = usb_get_serial_data(port->serial);
+ port_priv = devm_kzalloc(&port->dev, sizeof(*port_priv), GFP_KERNEL);
+ if (!port_priv)
+ return -ENOMEM;
+
+ /*
+ * We'll make tx frame error when baud rate from 384~500kps. So we'll
+ * delay all tx data frame with 1bit.
+ */
+ port_priv->shadow_clk = F81534_UART_EN | F81534_CLK_TX_DELAY_1BIT;
+ spin_lock_init(&port_priv->msr_lock);
+ mutex_init(&port_priv->mcr_mutex);
+ mutex_init(&port_priv->lcr_mutex);
+ INIT_WORK(&port_priv->lsr_work, f81534_lsr_worker);
+
+ /* Assign logic-to-phy mapping */
+ ret = f81534_logic_to_phy_port(port->serial, port);
+ if (ret < 0)
+ return ret;
+
+ port_priv->phy_num = ret;
+ port_priv->port = port;
+ 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);
+
+ /*
+ * The F81532/534 will hang-up when enable LSR interrupt in IER and
+ * occur data overrun. So we'll disable the LSR interrupt in probe()
+ * and submit the LSR worker to clear LSR state when reported LSR error
+ * bit with bulk-in data in f81534_process_per_serial_block().
+ */
+ ret = f81534_set_port_register(port, F81534_INTERRUPT_ENABLE_REG,
+ UART_IER_RDI | UART_IER_THRI | UART_IER_MSI);
+ if (ret)
+ return ret;
+
+ value = serial_priv->conf_data[port_priv->phy_num];
+ switch (value & F81534_PORT_CONF_MODE_MASK) {
+ case F81534_PORT_CONF_RS485_INVERT:
+ port_priv->shadow_clk |= F81534_CLK_RS485_MODE |
+ F81534_CLK_RS485_INVERT;
+ dev_dbg(&port->dev, "RS485 invert mode\n");
+ break;
+ case F81534_PORT_CONF_RS485:
+ port_priv->shadow_clk |= F81534_CLK_RS485_MODE;
+ dev_dbg(&port->dev, "RS485 mode\n");
+ break;
+
+ default:
+ case F81534_PORT_CONF_RS232:
+ dev_dbg(&port->dev, "RS232 mode\n");
+ break;
+ }
+
+ return f81534_set_port_output_pin(port);
+}
+
+static void f81534_port_remove(struct usb_serial_port *port)
+{
+ struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
+
+ flush_work(&port_priv->lsr_work);
+}
+
+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,
+ .num_bulk_in = 1,
+ .num_bulk_out = 1,
+ .open = f81534_open,
+ .close = f81534_close,
+ .write = f81534_write,
+ .tx_empty = f81534_tx_empty,
+ .calc_num_ports = f81534_calc_num_ports,
+ .port_probe = f81534_port_probe,
+ .port_remove = f81534_port_remove,
+ .break_ctl = f81534_break_ctl,
+ .dtr_rts = f81534_dtr_rts,
+ .process_read_urb = f81534_process_read_urb,
+ .get_serial = f81534_get_serial_info,
+ .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 <Peter_Hong@fintek.com.tw>");
+MODULE_AUTHOR("Tom Tsai <Tom_Tsai@fintek.com.tw>");
+MODULE_LICENSE("GPL");