--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
+ *
+ * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
+ *
+ * Support to set flow control line levels using TIOCMGET and TIOCMSET
+ * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
+ * control thanks to Munir Nassar nassarmu@real-time.com
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/usb.h>
+#include <linux/uaccess.h>
+#include <linux/usb/serial.h>
+
+#define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
+
+/*
+ * Function Prototypes
+ */
+static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
+static void cp210x_close(struct usb_serial_port *);
+static int cp210x_ioctl(struct tty_struct *tty,
+ unsigned int cmd, unsigned long arg);
+static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
+static void cp210x_get_termios_port(struct usb_serial_port *port,
+ tcflag_t *cflagp, unsigned int *baudp);
+static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
+ struct ktermios *);
+static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
+ struct ktermios*);
+static bool cp210x_tx_empty(struct usb_serial_port *port);
+static int cp210x_tiocmget(struct tty_struct *);
+static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
+static int cp210x_tiocmset_port(struct usb_serial_port *port,
+ unsigned int, unsigned int);
+static void cp210x_break_ctl(struct tty_struct *, int);
+static int cp210x_port_probe(struct usb_serial_port *);
+static int cp210x_port_remove(struct usb_serial_port *);
+static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
+
+static const struct usb_device_id id_table[] = {
+ { USB_DEVICE(0x04E8, 0x20C6) }, /* SmartThings link WW (Zigbee Only) */
+ { USB_DEVICE(0x04E8, 0x20C7) }, /* SmartThings link US */
+ { USB_DEVICE(0x04E8, 0x20C8) }, /* SmartThings link EU */
+ { USB_DEVICE(0x04E8, 0x20C9) }, /* SmartThings link KR */
+ { } /* Terminating Entry */
+};
+
+MODULE_DEVICE_TABLE(usb, id_table);
+
+struct cp210x_port_private {
+ __u8 bPartNumber;
+ __u8 bInterfaceNumber;
+ bool has_swapped_line_ctl;
+ bool is_cp2102n_a01;
+};
+
+static struct usb_serial_driver cp210x_device = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "cp210x",
+ },
+ .id_table = id_table,
+ .num_ports = 1,
+ .bulk_in_size = 256,
+ .bulk_out_size = 256,
+ .open = cp210x_open,
+ .close = cp210x_close,
+ .ioctl = cp210x_ioctl,
+ .break_ctl = cp210x_break_ctl,
+ .set_termios = cp210x_set_termios,
+ .tx_empty = cp210x_tx_empty,
+ .tiocmget = cp210x_tiocmget,
+ .tiocmset = cp210x_tiocmset,
+ .port_probe = cp210x_port_probe,
+ .port_remove = cp210x_port_remove,
+ .dtr_rts = cp210x_dtr_rts
+};
+
+/* IOCTLs */
+#define IOCTL_GPIOGET 0x8000
+#define IOCTL_GPIOSET 0x8001
+
+static struct usb_serial_driver * const serial_drivers[] = {
+ &cp210x_device, NULL
+};
+
+/* Config request types */
+#define REQTYPE_HOST_TO_INTERFACE 0x41
+#define REQTYPE_INTERFACE_TO_HOST 0xc1
+#define REQTYPE_HOST_TO_DEVICE 0x40
+#define REQTYPE_DEVICE_TO_HOST 0xc0
+
+/* Config request codes */
+#define CP210X_IFC_ENABLE 0x00
+#define CP210X_SET_BAUDDIV 0x01
+#define CP210X_GET_BAUDDIV 0x02
+#define CP210X_SET_LINE_CTL 0x03
+#define CP210X_GET_LINE_CTL 0x04
+#define CP210X_SET_BREAK 0x05
+#define CP210X_IMM_CHAR 0x06
+#define CP210X_SET_MHS 0x07
+#define CP210X_GET_MDMSTS 0x08
+#define CP210X_SET_XON 0x09
+#define CP210X_SET_XOFF 0x0A
+#define CP210X_SET_EVENTMASK 0x0B
+#define CP210X_GET_EVENTMASK 0x0C
+#define CP210X_SET_CHAR 0x0D
+#define CP210X_GET_CHARS 0x0E
+#define CP210X_GET_PROPS 0x0F
+#define CP210X_GET_COMM_STATUS 0x10
+#define CP210X_RESET 0x11
+#define CP210X_PURGE 0x12
+#define CP210X_SET_FLOW 0x13
+#define CP210X_GET_FLOW 0x14
+#define CP210X_EMBED_EVENTS 0x15
+#define CP210X_GET_EVENTSTATE 0x16
+#define CP210X_SET_CHARS 0x19
+#define CP210X_GET_BAUDRATE 0x1D
+#define CP210X_SET_BAUDRATE 0x1E
+#define CP210X_VENDOR_SPECIFIC 0xFF
+
+/* CP210X_IFC_ENABLE */
+#define UART_ENABLE 0x0001
+#define UART_DISABLE 0x0000
+
+/* CP210X_(SET|GET)_BAUDDIV */
+#define BAUD_RATE_GEN_FREQ 0x384000
+
+/* CP210X_(SET|GET)_LINE_CTL */
+#define BITS_DATA_MASK 0X0f00
+#define BITS_DATA_5 0X0500
+#define BITS_DATA_6 0X0600
+#define BITS_DATA_7 0X0700
+#define BITS_DATA_8 0X0800
+#define BITS_DATA_9 0X0900
+
+#define BITS_PARITY_MASK 0x00f0
+#define BITS_PARITY_NONE 0x0000
+#define BITS_PARITY_ODD 0x0010
+#define BITS_PARITY_EVEN 0x0020
+#define BITS_PARITY_MARK 0x0030
+#define BITS_PARITY_SPACE 0x0040
+
+#define BITS_STOP_MASK 0x000f
+#define BITS_STOP_1 0x0000
+#define BITS_STOP_1_5 0x0001
+#define BITS_STOP_2 0x0002
+
+/* CP210X_SET_BREAK */
+#define BREAK_ON 0x0001
+#define BREAK_OFF 0x0000
+
+/* CP210X_(SET_MHS|GET_MDMSTS) */
+#define CONTROL_DTR 0x0001
+#define CONTROL_RTS 0x0002
+#define CONTROL_CTS 0x0010
+#define CONTROL_DSR 0x0020
+#define CONTROL_RING 0x0040
+#define CONTROL_DCD 0x0080
+#define CONTROL_WRITE_DTR 0x0100
+#define CONTROL_WRITE_RTS 0x0200
+
+/* CP210X_VENDOR_SPECIFIC sub-commands passed in wValue */
+#define CP210X_WRITE_LATCH 0x37E1
+#define CP210X_READ_LATCH 0x00C2
+#define CP210X_GET_PARTNUM 0x370B
+#define CP2102N_GET_FW_VERS 0x0010
+
+/* CP210X_GET_PARTNUM returns one of these */
+#define CP2101_PARTNUM 0x01
+#define CP2102_PARTNUM 0x02
+#define CP2103_PARTNUM 0x03
+#define CP2104_PARTNUM 0x04
+#define CP2105_PARTNUM 0x05
+#define CP2108_PARTNUM 0x08
+#define CP210x_PARTNUM_CP2102N_QFN28 0x20
+#define CP210x_PARTNUM_CP2102N_QFN24 0x21
+#define CP210x_PARTNUM_CP2102N_QFN20 0x22
+
+/* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
+struct cp210x_comm_status {
+ __le32 ulErrors;
+ __le32 ulHoldReasons;
+ __le32 ulAmountInInQueue;
+ __le32 ulAmountInOutQueue;
+ u8 bEofReceived;
+ u8 bWaitForImmediate;
+ u8 bReserved;
+} __packed;
+
+/*
+ * CP210X_PURGE - 16 bits passed in wValue of USB request.
+ * SiLabs app note AN571 gives a strange description of the 4 bits:
+ * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
+ * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
+ */
+#define PURGE_ALL 0x000f
+
+/* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
+struct cp210x_flow_ctl {
+ __le32 ulControlHandshake;
+ __le32 ulFlowReplace;
+ __le32 ulXonLimit;
+ __le32 ulXoffLimit;
+} __packed;
+
+/* cp210x_flow_ctl::ulControlHandshake */
+#define CP210X_SERIAL_DTR_MASK GENMASK(1, 0)
+#define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode)
+#define CP210X_SERIAL_CTS_HANDSHAKE BIT(3)
+#define CP210X_SERIAL_DSR_HANDSHAKE BIT(4)
+#define CP210X_SERIAL_DCD_HANDSHAKE BIT(5)
+#define CP210X_SERIAL_DSR_SENSITIVITY BIT(6)
+
+/* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
+#define CP210X_SERIAL_DTR_INACTIVE 0
+#define CP210X_SERIAL_DTR_ACTIVE 1
+#define CP210X_SERIAL_DTR_FLOW_CTL 2
+
+/* cp210x_flow_ctl::ulFlowReplace */
+#define CP210X_SERIAL_AUTO_TRANSMIT BIT(0)
+#define CP210X_SERIAL_AUTO_RECEIVE BIT(1)
+#define CP210X_SERIAL_ERROR_CHAR BIT(2)
+#define CP210X_SERIAL_NULL_STRIPPING BIT(3)
+#define CP210X_SERIAL_BREAK_CHAR BIT(4)
+#define CP210X_SERIAL_RTS_MASK GENMASK(7, 6)
+#define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6)
+#define CP210X_SERIAL_XOFF_CONTINUE BIT(31)
+
+/* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
+#define CP210X_SERIAL_RTS_INACTIVE 0
+#define CP210X_SERIAL_RTS_ACTIVE 1
+#define CP210X_SERIAL_RTS_FLOW_CTL 2
+
+/*
+ * Reads a variable-sized block of CP210X_ registers, identified by req.
+ * Returns data into buf in native USB byte order.
+ */
+static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
+ void *buf, int bufsize)
+{
+ struct usb_serial *serial = port->serial;
+ struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
+ void *dmabuf;
+ int result;
+
+ dmabuf = kmalloc(bufsize, GFP_KERNEL);
+ if (!dmabuf) {
+ /*
+ * FIXME Some callers don't bother to check for error,
+ * at least give them consistent junk until they are fixed
+ */
+ memset(buf, 0, bufsize);
+ return -ENOMEM;
+ }
+
+ result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
+ req, REQTYPE_INTERFACE_TO_HOST, 0,
+ port_priv->bInterfaceNumber, dmabuf, bufsize,
+ USB_CTRL_SET_TIMEOUT);
+ if (result == bufsize) {
+ memcpy(buf, dmabuf, bufsize);
+ result = 0;
+ } else {
+ dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
+ req, bufsize, result);
+ if (result >= 0)
+ result = -EPROTO;
+
+ /*
+ * FIXME Some callers don't bother to check for error,
+ * at least give them consistent junk until they are fixed
+ */
+ memset(buf, 0, bufsize);
+ }
+
+ kfree(dmabuf);
+
+ return result;
+}
+
+/*
+ * Reads any 32-bit CP210X_ register identified by req.
+ */
+static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
+{
+ __le32 le32_val;
+ int err;
+
+ err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
+ if (err) {
+ /*
+ * FIXME Some callers don't bother to check for error,
+ * at least give them consistent junk until they are fixed
+ */
+ *val = 0;
+ return err;
+ }
+
+ *val = le32_to_cpu(le32_val);
+
+ return 0;
+}
+
+/*
+ * Reads any 16-bit CP210X_ register identified by req.
+ */
+static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
+{
+ __le16 le16_val;
+ int err;
+
+ err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
+ if (err)
+ return err;
+
+ *val = le16_to_cpu(le16_val);
+
+ return 0;
+}
+
+/*
+ * Reads any 8-bit CP210X_ register identified by req.
+ */
+static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
+{
+ return cp210x_read_reg_block(port, req, val, sizeof(*val));
+}
+
+/*
+ * Writes any 16-bit CP210X_ register (req) whose value is passed
+ * entirely in the wValue field of the USB request.
+ */
+static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
+{
+ struct usb_serial *serial = port->serial;
+ struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
+ int result;
+
+ result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
+ req, REQTYPE_HOST_TO_INTERFACE, val,
+ port_priv->bInterfaceNumber, NULL, 0,
+ USB_CTRL_SET_TIMEOUT);
+ if (result < 0) {
+ dev_err(&port->dev, "failed set request 0x%x status: %d\n",
+ req, result);
+ }
+
+ return result;
+}
+
+/*
+ * Writes a variable-sized block of CP210X_ registers, identified by req.
+ * Data in buf must be in native USB byte order.
+ */
+static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
+ void *buf, int bufsize)
+{
+ struct usb_serial *serial = port->serial;
+ struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
+ void *dmabuf;
+ int result;
+
+ dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
+ if (!dmabuf)
+ return -ENOMEM;
+
+ result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
+ req, REQTYPE_HOST_TO_INTERFACE, 0,
+ port_priv->bInterfaceNumber, dmabuf, bufsize,
+ USB_CTRL_SET_TIMEOUT);
+
+ kfree(dmabuf);
+
+ if (result == bufsize) {
+ result = 0;
+ } else {
+ dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
+ req, bufsize, result);
+ if (result >= 0)
+ result = -EPROTO;
+ }
+
+ return result;
+}
+
+/*
+ * Writes any 32-bit CP210X_ register identified by req.
+ */
+static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
+{
+ __le32 le32_val;
+
+ le32_val = cpu_to_le32(val);
+
+ return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
+}
+
+/*
+ * Detect CP2108 GET_LINE_CTL bug and activate workaround.
+ * Write a known good value 0x800, read it back.
+ * If it comes back swapped the bug is detected.
+ * Preserve the original register value.
+ */
+static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
+{
+ struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
+ u16 line_ctl_save;
+ u16 line_ctl_test;
+ int err;
+
+ err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
+ if (err)
+ return err;
+
+ err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
+ if (err)
+ return err;
+
+ err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
+ if (err)
+ return err;
+
+ if (line_ctl_test == 8) {
+ port_priv->has_swapped_line_ctl = true;
+ line_ctl_save = swab16(line_ctl_save);
+ }
+
+ return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
+}
+
+/*
+ * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
+ * to workaround cp2108 bug and get correct value.
+ */
+static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
+{
+ struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
+ int err;
+
+ err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
+ if (err)
+ return err;
+
+ /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
+ if (port_priv->has_swapped_line_ctl)
+ *ctl = swab16(*ctl);
+
+ return 0;
+}
+
+/*
+ * cp210x_quantise_baudrate
+ * Quantises the baud rate as per AN205 Table 1
+ */
+static unsigned int cp210x_quantise_baudrate(unsigned int baud)
+{
+ if (baud <= 300)
+ baud = 300;
+ else if (baud <= 600) baud = 600;
+ else if (baud <= 1200) baud = 1200;
+ else if (baud <= 1800) baud = 1800;
+ else if (baud <= 2400) baud = 2400;
+ else if (baud <= 4000) baud = 4000;
+ else if (baud <= 4803) baud = 4800;
+ else if (baud <= 7207) baud = 7200;
+ else if (baud <= 9612) baud = 9600;
+ else if (baud <= 14428) baud = 14400;
+ else if (baud <= 16062) baud = 16000;
+ else if (baud <= 19250) baud = 19200;
+ else if (baud <= 28912) baud = 28800;
+ else if (baud <= 38601) baud = 38400;
+ else if (baud <= 51558) baud = 51200;
+ else if (baud <= 56280) baud = 56000;
+ else if (baud <= 58053) baud = 57600;
+ else if (baud <= 64111) baud = 64000;
+ else if (baud <= 77608) baud = 76800;
+ else if (baud <= 117028) baud = 115200;
+ else if (baud <= 129347) baud = 128000;
+ else if (baud <= 156868) baud = 153600;
+ else if (baud <= 237832) baud = 230400;
+ else if (baud <= 254234) baud = 250000;
+ else if (baud <= 273066) baud = 256000;
+ else if (baud <= 491520) baud = 460800;
+ else if (baud <= 567138) baud = 500000;
+ else if (baud <= 670254) baud = 576000;
+ else if (baud < 1000000)
+ baud = 921600;
+ else if (baud > 2000000)
+ baud = 2000000;
+ return baud;
+}
+
+static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
+{
+ int result;
+
+ result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
+ if (result) {
+ dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
+ return result;
+ }
+
+ /* Configure the termios structure */
+ cp210x_get_termios(tty, port);
+
+ /* The baud rate must be initialised on cp2104 */
+ if (tty)
+ cp210x_change_speed(tty, port, NULL);
+
+ return usb_serial_generic_open(tty, port);
+}
+
+static void cp210x_close(struct usb_serial_port *port)
+{
+ struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
+
+ usb_serial_generic_close(port);
+
+ /* Clear both queues; cp2108 needs this to avoid an occasional hang */
+ cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
+
+ cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
+
+ if (port_priv->is_cp2102n_a01) {
+ int result;
+
+ struct usb_serial *serial = port->serial;
+
+ result = usb_control_msg(serial->dev,
+ usb_sndctrlpipe(serial->dev, 0),
+ 0x09,
+ 0,
+ 0,
+ port_priv->bInterfaceNumber,
+ NULL,
+ 0,
+ USB_CTRL_SET_TIMEOUT);
+
+
+ if (result < 0) {
+ dev_err(&port->dev, "failed usb_control_msg (1) request 0x09 status: %d\n",
+ result);
+ }
+
+ result = usb_control_msg(serial->dev,
+ usb_sndctrlpipe(serial->dev, 0),
+ 0x09,
+ 0,
+ 1,
+ port_priv->bInterfaceNumber,
+ NULL,
+ 0,
+ USB_CTRL_SET_TIMEOUT);
+
+
+ if (result < 0) {
+ dev_err(&port->dev, "failed usb_control_msg (2) request 0x09 status: %d\n",
+ result);
+ }
+
+
+ result = usb_control_msg(serial->dev,
+ usb_sndctrlpipe(serial->dev, 0),
+ 0x01,
+ 2,
+ 0,
+ 0x82,
+ NULL,
+ 0,
+ USB_CTRL_SET_TIMEOUT);
+
+
+ if (result < 0) {
+ dev_err(&port->dev, "failed usb_control_msg (1) request 0x01 status: %d\n",
+ result);
+ }
+
+ result = usb_control_msg(serial->dev,
+ usb_sndctrlpipe(serial->dev, 0),
+ 0x01,
+ 2,
+ 0,
+ 0x02,
+ NULL,
+ 0,
+ USB_CTRL_SET_TIMEOUT);
+
+
+ if (result < 0) {
+ dev_err(&port->dev, "failed usb_control_msg (2) request 0x01 status: %d\n",
+ result);
+ }
+
+ }
+}
+
+/*
+ * Reads a variable-sized vendor-specific register identified by wValue
+ * Returns data into buf in native USB byte order.
+ */
+static int cp210x_read_vs_reg_block(struct usb_serial_port *port, u8 bmRequestType,
+ u16 wValue, void *buf, int bufsize)
+{
+ struct usb_serial *serial = port->serial;
+ struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
+ void *dmabuf;
+ int result;
+
+ dmabuf = kmalloc(bufsize, GFP_KERNEL);
+ if (!dmabuf)
+ return -ENOMEM;
+
+ result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
+ CP210X_VENDOR_SPECIFIC, bmRequestType, wValue,
+ port_priv->bInterfaceNumber, dmabuf, bufsize,
+ USB_CTRL_SET_TIMEOUT);
+ if (result == bufsize) {
+ memcpy(buf, dmabuf, bufsize);
+ result = 0;
+ } else {
+ dev_err(&port->dev, "failed get VENDOR_SPECIFIC wValue 0x%x size %d status: %d\n",
+ wValue, bufsize, result);
+ if (result >= 0)
+ result = -EPROTO;
+ }
+
+ kfree(dmabuf);
+
+ return result;
+}
+
+/* GPIO register read from single-interface CP210x */
+static int cp210x_read_device_gpio_u8(struct usb_serial_port *port, u8 *val)
+{
+ return cp210x_read_vs_reg_block(port, REQTYPE_DEVICE_TO_HOST, CP210X_READ_LATCH, val, 1);
+}
+
+/* GPIO register read from CP2105 */
+static int cp210x_read_interface_gpio_u8(struct usb_serial_port *port, u8 *val)
+{
+ return cp210x_read_vs_reg_block(port, REQTYPE_INTERFACE_TO_HOST, CP210X_READ_LATCH, val, 1);
+}
+
+/* GPIO register read from CP2108 */
+static int cp210x_read_device_gpio_u16(struct usb_serial_port *port, u16 *val)
+{
+ __le16 le16_val;
+ int err = cp210x_read_vs_reg_block(port, REQTYPE_DEVICE_TO_HOST, CP210X_READ_LATCH, &le16_val, 2);
+ if (err)
+ return err;
+
+ *val = le16_to_cpu(le16_val);
+ return 0;
+}
+
+/* GPIO register write to single-interface CP210x */
+static int cp210x_write_device_gpio_u16(struct usb_serial_port *port, u16 val)
+{
+ int result;
+
+ result = usb_control_msg(port->serial->dev,
+ usb_sndctrlpipe(port->serial->dev, 0),
+ CP210X_VENDOR_SPECIFIC,
+ REQTYPE_HOST_TO_DEVICE,
+ CP210X_WRITE_LATCH, /* wValue */
+ val, /* wIndex */
+ NULL, 0, USB_CTRL_SET_TIMEOUT);
+ if (result != 0) {
+ dev_err(&port->dev, "failed set WRITE_LATCH status: %d\n",
+ result);
+ if (result >= 0)
+ result = -EPROTO;
+ }
+ return result;
+}
+
+/*
+ * Writes a variable-sized block of CP210X_ registers, identified by req.
+ * Data in buf must be in native USB byte order.
+ */
+static int cp210x_write_gpio_reg_block(struct usb_serial_port *port,
+ u8 bmRequestType, void *buf, int bufsize)
+{
+ struct usb_serial *serial = port->serial;
+ struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
+ void *dmabuf;
+ int result;
+
+ dmabuf = kmalloc(bufsize, GFP_KERNEL);
+ if (!dmabuf)
+ return -ENOMEM;
+
+ memcpy(dmabuf, buf, bufsize);
+
+ result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
+ CP210X_VENDOR_SPECIFIC, bmRequestType,
+ CP210X_WRITE_LATCH, /* wValue */
+ port_priv->bInterfaceNumber, /* wIndex */
+ dmabuf, bufsize,
+ USB_CTRL_SET_TIMEOUT);
+
+ kfree(dmabuf);
+
+ if (result == bufsize) {
+ result = 0;
+ } else {
+ dev_err(&port->dev, "failed set WRITE_LATCH size %d status: %d\n",
+ bufsize, result);
+ if (result >= 0)
+ result = -EPROTO;
+ }
+
+ return result;
+}
+
+/* GPIO register write to CP2105 */
+static int cp210x_write_interface_gpio_u16(struct usb_serial_port *port, u16 val)
+{
+ __le16 le16_val = cpu_to_le16(val);
+
+ return cp210x_write_gpio_reg_block(port, REQTYPE_HOST_TO_INTERFACE, &le16_val, 2);
+}
+
+/* GPIO register write to CP2108 */
+static int cp210x_write_device_gpio_u32(struct usb_serial_port *port, u32 val)
+{
+ __le32 le32_val = cpu_to_le32(val);
+
+ return cp210x_write_gpio_reg_block(port, REQTYPE_HOST_TO_DEVICE, &le32_val, 4);
+}
+
+static int cp210x_ioctl(struct tty_struct *tty,
+ unsigned int cmd, unsigned long arg)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
+
+ switch (cmd) {
+ case IOCTL_GPIOGET:
+ if ((port_priv->bPartNumber == CP2103_PARTNUM) ||
+ (port_priv->bPartNumber == CP2104_PARTNUM) ||
+ (port_priv->bPartNumber == CP210x_PARTNUM_CP2102N_QFN28) ||
+ (port_priv->bPartNumber == CP210x_PARTNUM_CP2102N_QFN24) ||
+ (port_priv->bPartNumber == CP210x_PARTNUM_CP2102N_QFN20)) {
+ u8 gpio;
+ int err = cp210x_read_device_gpio_u8(port, &gpio);
+ if (err)
+ return err;
+ if (copy_to_user((void*)arg, &gpio, sizeof(gpio)))
+ return -EFAULT;
+ return 0;
+ }
+ else if (port_priv->bPartNumber == CP2105_PARTNUM) {
+ u8 gpio;
+ int err = cp210x_read_interface_gpio_u8(port, &gpio);
+ if (err)
+ return err;
+ if (copy_to_user((void*)arg, &gpio, sizeof(gpio)))
+ return -EFAULT;
+ return 0;
+ }
+ else if (port_priv->bPartNumber == CP2108_PARTNUM) {
+ u16 gpio;
+ int err = cp210x_read_device_gpio_u16(port, &gpio);
+ if (err)
+ return err;
+ if (copy_to_user((void*)arg, &gpio, sizeof(gpio)))
+ return -EFAULT;
+ return 0;
+ }
+ else {
+ return -ENOTSUPP;
+ }
+ break;
+ case IOCTL_GPIOSET:
+ if ((port_priv->bPartNumber == CP2103_PARTNUM) ||
+ (port_priv->bPartNumber == CP2104_PARTNUM) ||
+ (port_priv->bPartNumber == CP210x_PARTNUM_CP2102N_QFN28) ||
+ (port_priv->bPartNumber == CP210x_PARTNUM_CP2102N_QFN24) ||
+ (port_priv->bPartNumber == CP210x_PARTNUM_CP2102N_QFN20)) {
+ u16 gpio;
+ if (copy_from_user(&gpio, (void*)arg, sizeof(gpio)))
+ return -EFAULT;
+ return cp210x_write_device_gpio_u16(port, gpio);
+ }
+ else if (port_priv->bPartNumber == CP2105_PARTNUM) {
+ u16 gpio;
+ if (copy_from_user(&gpio, (void*)arg, sizeof(gpio)))
+ return -EFAULT;
+ return cp210x_write_interface_gpio_u16(port, gpio);
+ }
+ else if (port_priv->bPartNumber == CP2108_PARTNUM) {
+ u32 gpio;
+ if (copy_from_user(&gpio, (void*)arg, sizeof(gpio)))
+ return -EFAULT;
+ return cp210x_write_device_gpio_u32(port, gpio);
+ }
+ else {
+ return -ENOTSUPP;
+ }
+ break;
+
+ default:
+ break;
+ }
+
+ return -ENOIOCTLCMD;
+}
+
+/*
+ * Read how many bytes are waiting in the TX queue.
+ */
+static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
+ u32 *count)
+{
+ struct usb_serial *serial = port->serial;
+ struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
+ struct cp210x_comm_status *sts;
+ int result;
+
+ sts = kmalloc(sizeof(*sts), GFP_KERNEL);
+ if (!sts)
+ return -ENOMEM;
+
+ result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
+ CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
+ 0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
+ USB_CTRL_GET_TIMEOUT);
+ if (result == sizeof(*sts)) {
+ *count = le32_to_cpu(sts->ulAmountInOutQueue);
+ result = 0;
+ } else {
+ dev_err(&port->dev, "failed to get comm status: %d\n", result);
+ if (result >= 0)
+ result = -EPROTO;
+ }
+
+ kfree(sts);
+
+ return result;
+}
+
+static bool cp210x_tx_empty(struct usb_serial_port *port)
+{
+ int err;
+ u32 count;
+
+ err = cp210x_get_tx_queue_byte_count(port, &count);
+ if (err)
+ return true;
+
+ return !count;
+}
+
+/*
+ * cp210x_get_termios
+ * Reads the baud rate, data bits, parity, stop bits and flow control mode
+ * from the device, corrects any unsupported values, and configures the
+ * termios structure to reflect the state of the device
+ */
+static void cp210x_get_termios(struct tty_struct *tty,
+ struct usb_serial_port *port)
+{
+ unsigned int baud;
+
+ if (tty) {
+ cp210x_get_termios_port(tty->driver_data,
+ &tty->termios.c_cflag, &baud);
+ tty_encode_baud_rate(tty, baud, baud);
+ } else {
+ tcflag_t cflag;
+ cflag = 0;
+ cp210x_get_termios_port(port, &cflag, &baud);
+ }
+}
+
+/*
+ * cp210x_get_termios_port
+ * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
+ */
+static void cp210x_get_termios_port(struct usb_serial_port *port,
+ tcflag_t *cflagp, unsigned int *baudp)
+{
+ struct device *dev = &port->dev;
+ tcflag_t cflag;
+ struct cp210x_flow_ctl flow_ctl;
+ u32 baud;
+ u16 bits;
+ u32 ctl_hs;
+
+ cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
+
+ dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
+ *baudp = baud;
+
+ cflag = *cflagp;
+
+ cp210x_get_line_ctl(port, &bits);
+ cflag &= ~CSIZE;
+ switch (bits & BITS_DATA_MASK) {
+ case BITS_DATA_5:
+ dev_dbg(dev, "%s - data bits = 5\n", __func__);
+ cflag |= CS5;
+ break;
+ case BITS_DATA_6:
+ dev_dbg(dev, "%s - data bits = 6\n", __func__);
+ cflag |= CS6;
+ break;
+ case BITS_DATA_7:
+ dev_dbg(dev, "%s - data bits = 7\n", __func__);
+ cflag |= CS7;
+ break;
+ case BITS_DATA_8:
+ dev_dbg(dev, "%s - data bits = 8\n", __func__);
+ cflag |= CS8;
+ break;
+ case BITS_DATA_9:
+ dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
+ cflag |= CS8;
+ bits &= ~BITS_DATA_MASK;
+ bits |= BITS_DATA_8;
+ cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
+ break;
+ default:
+ dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
+ cflag |= CS8;
+ bits &= ~BITS_DATA_MASK;
+ bits |= BITS_DATA_8;
+ cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
+ break;
+ }
+
+ switch (bits & BITS_PARITY_MASK) {
+ case BITS_PARITY_NONE:
+ dev_dbg(dev, "%s - parity = NONE\n", __func__);
+ cflag &= ~PARENB;
+ break;
+ case BITS_PARITY_ODD:
+ dev_dbg(dev, "%s - parity = ODD\n", __func__);
+ cflag |= (PARENB|PARODD);
+ break;
+ case BITS_PARITY_EVEN:
+ dev_dbg(dev, "%s - parity = EVEN\n", __func__);
+ cflag &= ~PARODD;
+ cflag |= PARENB;
+ break;
+ case BITS_PARITY_MARK:
+ dev_dbg(dev, "%s - parity = MARK\n", __func__);
+ cflag |= (PARENB|PARODD|CMSPAR);
+ break;
+ case BITS_PARITY_SPACE:
+ dev_dbg(dev, "%s - parity = SPACE\n", __func__);
+ cflag &= ~PARODD;
+ cflag |= (PARENB|CMSPAR);
+ break;
+ default:
+ dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
+ cflag &= ~PARENB;
+ bits &= ~BITS_PARITY_MASK;
+ cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
+ break;
+ }
+
+ cflag &= ~CSTOPB;
+ switch (bits & BITS_STOP_MASK) {
+ case BITS_STOP_1:
+ dev_dbg(dev, "%s - stop bits = 1\n", __func__);
+ break;
+ case BITS_STOP_1_5:
+ dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
+ bits &= ~BITS_STOP_MASK;
+ cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
+ break;
+ case BITS_STOP_2:
+ dev_dbg(dev, "%s - stop bits = 2\n", __func__);
+ cflag |= CSTOPB;
+ break;
+ default:
+ dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
+ bits &= ~BITS_STOP_MASK;
+ cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
+ break;
+ }
+
+ cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
+ sizeof(flow_ctl));
+ ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
+ if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
+ dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
+ cflag |= CRTSCTS;
+ } else {
+ dev_dbg(dev, "%s - flow control = NONE\n", __func__);
+ cflag &= ~CRTSCTS;
+ }
+
+ *cflagp = cflag;
+}
+
+/*
+ * CP2101 supports the following baud rates:
+ *
+ * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
+ * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
+ *
+ * CP2102 and CP2103 support the following additional rates:
+ *
+ * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
+ * 576000
+ *
+ * The device will map a requested rate to a supported one, but the result
+ * of requests for rates greater than 1053257 is undefined (see AN205).
+ *
+ * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
+ * respectively, with an error less than 1%. The actual rates are determined
+ * by
+ *
+ * div = round(freq / (2 x prescale x request))
+ * actual = freq / (2 x prescale x div)
+ *
+ * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
+ * or 1 otherwise.
+ * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
+ * otherwise.
+ */
+static void cp210x_change_speed(struct tty_struct *tty,
+ struct usb_serial_port *port, struct ktermios *old_termios)
+{
+ u32 baud;
+
+ baud = tty->termios.c_ospeed;
+
+ /* This maps the requested rate to a rate valid on cp2102 or cp2103,
+ * or to an arbitrary rate in [1M,2M].
+ *
+ * NOTE: B0 is not implemented.
+ */
+ baud = cp210x_quantise_baudrate(baud);
+
+ dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
+ if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
+ dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
+ if (old_termios)
+ baud = old_termios->c_ospeed;
+ else
+ baud = 9600;
+ }
+
+ tty_encode_baud_rate(tty, baud, baud);
+}
+
+static void cp210x_set_termios(struct tty_struct *tty,
+ struct usb_serial_port *port, struct ktermios *old_termios)
+{
+ struct device *dev = &port->dev;
+ unsigned int cflag, old_cflag;
+ u16 bits;
+
+ cflag = tty->termios.c_cflag;
+ old_cflag = old_termios->c_cflag;
+
+ if (tty->termios.c_ospeed != old_termios->c_ospeed)
+ cp210x_change_speed(tty, port, old_termios);
+
+ /* If the number of data bits is to be updated */
+ if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
+ cp210x_get_line_ctl(port, &bits);
+ bits &= ~BITS_DATA_MASK;
+ switch (cflag & CSIZE) {
+ case CS5:
+ bits |= BITS_DATA_5;
+ dev_dbg(dev, "%s - data bits = 5\n", __func__);
+ break;
+ case CS6:
+ bits |= BITS_DATA_6;
+ dev_dbg(dev, "%s - data bits = 6\n", __func__);
+ break;
+ case CS7:
+ bits |= BITS_DATA_7;
+ dev_dbg(dev, "%s - data bits = 7\n", __func__);
+ break;
+ case CS8:
+ bits |= BITS_DATA_8;
+ dev_dbg(dev, "%s - data bits = 8\n", __func__);
+ break;
+ default:
+ dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
+ bits |= BITS_DATA_8;
+ break;
+ }
+ if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
+ dev_dbg(dev, "Number of data bits requested not supported by device\n");
+ }
+
+ if ((cflag & (PARENB|PARODD|CMSPAR)) !=
+ (old_cflag & (PARENB|PARODD|CMSPAR))) {
+ cp210x_get_line_ctl(port, &bits);
+ bits &= ~BITS_PARITY_MASK;
+ if (cflag & PARENB) {
+ if (cflag & CMSPAR) {
+ if (cflag & PARODD) {
+ bits |= BITS_PARITY_MARK;
+ dev_dbg(dev, "%s - parity = MARK\n", __func__);
+ } else {
+ bits |= BITS_PARITY_SPACE;
+ dev_dbg(dev, "%s - parity = SPACE\n", __func__);
+ }
+ } else {
+ if (cflag & PARODD) {
+ bits |= BITS_PARITY_ODD;
+ dev_dbg(dev, "%s - parity = ODD\n", __func__);
+ } else {
+ bits |= BITS_PARITY_EVEN;
+ dev_dbg(dev, "%s - parity = EVEN\n", __func__);
+ }
+ }
+ }
+ if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
+ dev_dbg(dev, "Parity mode not supported by device\n");
+ }
+
+ if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
+ cp210x_get_line_ctl(port, &bits);
+ bits &= ~BITS_STOP_MASK;
+ if (cflag & CSTOPB) {
+ bits |= BITS_STOP_2;
+ dev_dbg(dev, "%s - stop bits = 2\n", __func__);
+ } else {
+ bits |= BITS_STOP_1;
+ dev_dbg(dev, "%s - stop bits = 1\n", __func__);
+ }
+ if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
+ dev_dbg(dev, "Number of stop bits requested not supported by device\n");
+ }
+
+ if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
+ struct cp210x_flow_ctl flow_ctl;
+ u32 ctl_hs;
+ u32 flow_repl;
+
+ cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
+ sizeof(flow_ctl));
+ ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
+ flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
+ dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
+ __func__, ctl_hs, flow_repl);
+
+ ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
+ ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
+ ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
+ ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
+ ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
+ if (cflag & CRTSCTS) {
+ ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
+
+ flow_repl &= ~CP210X_SERIAL_RTS_MASK;
+ flow_repl |= CP210X_SERIAL_RTS_SHIFT(
+ CP210X_SERIAL_RTS_FLOW_CTL);
+ dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
+ } else {
+ ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
+
+ flow_repl &= ~CP210X_SERIAL_RTS_MASK;
+ flow_repl |= CP210X_SERIAL_RTS_SHIFT(
+ CP210X_SERIAL_RTS_ACTIVE);
+ dev_dbg(dev, "%s - flow control = NONE\n", __func__);
+ }
+
+ dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
+ __func__, ctl_hs, flow_repl);
+ flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
+ flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
+ cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
+ sizeof(flow_ctl));
+ }
+
+}
+
+static int cp210x_tiocmset(struct tty_struct *tty,
+ unsigned int set, unsigned int clear)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ return cp210x_tiocmset_port(port, set, clear);
+}
+
+static int cp210x_tiocmset_port(struct usb_serial_port *port,
+ unsigned int set, unsigned int clear)
+{
+ u16 control = 0;
+
+ if (set & TIOCM_RTS) {
+ control |= CONTROL_RTS;
+ control |= CONTROL_WRITE_RTS;
+ }
+ if (set & TIOCM_DTR) {
+ control |= CONTROL_DTR;
+ control |= CONTROL_WRITE_DTR;
+ }
+ if (clear & TIOCM_RTS) {
+ control &= ~CONTROL_RTS;
+ control |= CONTROL_WRITE_RTS;
+ }
+ if (clear & TIOCM_DTR) {
+ control &= ~CONTROL_DTR;
+ control |= CONTROL_WRITE_DTR;
+ }
+
+ dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
+
+ return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
+}
+
+static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
+{
+ if (on)
+ cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
+ else
+ cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
+}
+
+static int cp210x_tiocmget(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ u8 control;
+ int result;
+
+ result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
+ if (result)
+ return result;
+
+ result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
+ |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
+ |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
+ |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
+ |((control & CONTROL_RING)? TIOCM_RI : 0)
+ |((control & CONTROL_DCD) ? TIOCM_CD : 0);
+
+ dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
+
+ return result;
+}
+
+static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ u16 state;
+
+ if (break_state == 0)
+ state = BREAK_OFF;
+ else
+ state = BREAK_ON;
+ dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
+ state == BREAK_OFF ? "off" : "on");
+ cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
+}
+
+static int cp210x_port_probe(struct usb_serial_port *port)
+{
+ struct usb_serial *serial = port->serial;
+ struct usb_host_interface *cur_altsetting;
+ struct cp210x_port_private *port_priv;
+ int ret;
+
+ port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
+ if (!port_priv)
+ return -ENOMEM;
+
+ cur_altsetting = serial->interface->cur_altsetting;
+ port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
+ port_priv->is_cp2102n_a01 = false;
+
+ usb_set_serial_port_data(port, port_priv);
+
+ ret = cp210x_read_vs_reg_block(port, REQTYPE_DEVICE_TO_HOST,
+ CP210X_GET_PARTNUM, &port_priv->bPartNumber, 1);
+ if (ret) {
+ kfree(port_priv);
+ return ret;
+ }
+
+ if ((port_priv->bPartNumber == CP210x_PARTNUM_CP2102N_QFN28) ||
+ (port_priv->bPartNumber == CP210x_PARTNUM_CP2102N_QFN24) ||
+ (port_priv->bPartNumber == CP210x_PARTNUM_CP2102N_QFN20)) {
+ // check the firmware version on the CP2102N.
+ u8 fwversion[3];
+ ret = cp210x_read_vs_reg_block(port, REQTYPE_DEVICE_TO_HOST, CP2102N_GET_FW_VERS, fwversion, sizeof(fwversion));
+ if (0 == ret) {
+ if (1 == fwversion[0] && 0 == fwversion[1] && fwversion[2] < 8) {
+ port_priv->is_cp2102n_a01 = true;
+ }
+ }
+
+ }
+
+ ret = cp210x_detect_swapped_line_ctl(port);
+ if (ret) {
+ kfree(port_priv);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int cp210x_port_remove(struct usb_serial_port *port)
+{
+ struct cp210x_port_private *port_priv;
+
+ port_priv = usb_get_serial_port_data(port);
+ kfree(port_priv);
+
+ return 0;
+}
+
+module_usb_serial_driver(serial_drivers, id_table);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL v2");
projects / platform / kernel / linux-rpi.git / commitdiff