From 5e7955171c430e964e44cbadaeca15c68f434826 Mon Sep 17 00:00:00 2001 From: Daniel Golle Date: Mon, 17 Jun 2024 15:31:12 +0100 Subject: [PATCH] generic: backport pending driver for Winchip CH348 USB serial Import patch and package kernel module for Winchip CH348 USB-to-8x-UART chip. Signed-off-by: Daniel Golle --- package/kernel/linux/modules/usb.mk | 16 + ...890-usb-serial-add-support-for-CH348.patch | 783 ++++++++++++++++++ 2 files changed, 799 insertions(+) create mode 100644 target/linux/generic/pending-6.6/890-usb-serial-add-support-for-CH348.patch diff --git a/package/kernel/linux/modules/usb.mk b/package/kernel/linux/modules/usb.mk index 7b680288b9..12725f10ee 100644 --- a/package/kernel/linux/modules/usb.mk +++ b/package/kernel/linux/modules/usb.mk @@ -655,6 +655,22 @@ endef $(eval $(call KernelPackage,usb-serial-ch341)) +define KernelPackage/usb-serial-ch348 + TITLE:=Support for CH348 devices + KCONFIG:=CONFIG_USB_SERIAL_CH348 + FILES:=$(LINUX_DIR)/drivers/usb/serial/ch348.ko + AUTOLOAD:=$(call AutoProbe,ch348) + DEPENDS:=@LINUX_6_6 + $(call AddDepends/usb-serial) +endef + +define KernelPackage/usb-serial-ch348/description + Kernel support for Winchiphead CH348 USB-to-8x-Serial converters +endef + +$(eval $(call KernelPackage,usb-serial-ch348)) + + define KernelPackage/usb-serial-edgeport TITLE:=Support for Digi Edgeport devices KCONFIG:=CONFIG_USB_SERIAL_EDGEPORT diff --git a/target/linux/generic/pending-6.6/890-usb-serial-add-support-for-CH348.patch b/target/linux/generic/pending-6.6/890-usb-serial-add-support-for-CH348.patch new file mode 100644 index 0000000000..028ecf41f7 --- /dev/null +++ b/target/linux/generic/pending-6.6/890-usb-serial-add-support-for-CH348.patch @@ -0,0 +1,783 @@ +From df1357358eec062241bddd2995e7ef0ce86cf45a Mon Sep 17 00:00:00 2001 +X-Patchwork-Submitter: Corentin Labbe +X-Patchwork-Id: 13656881 +Message-Id: <20240507131522.3546113-2-clabbe@baylibre.com> +X-Mailer: git-send-email 2.25.1 +In-Reply-To: <20240507131522.3546113-1-clabbe@baylibre.com> +References: <20240507131522.3546113-1-clabbe@baylibre.com> +Precedence: bulk +X-Mailing-List: linux-usb@vger.kernel.org +List-Id: +From: Corentin Labbe +Date: Tue, 7 May 2024 13:15:22 +0000 +Subject: [PATCH v7] usb: serial: add support for CH348 + +The CH348 is an USB octo port serial adapter. +The device multiplexes all 8 ports in the same pair of Bulk endpoints. +Since there is no public datasheet, unfortunately it remains some magic values + +Signed-off-by: Corentin Labbe +Tested-by: Martin Blumenstingl +--- + drivers/usb/serial/Kconfig | 9 + + drivers/usb/serial/Makefile | 1 + + drivers/usb/serial/ch348.c | 725 ++++++++++++++++++++++++++++++++++++ + 3 files changed, 735 insertions(+) + create mode 100644 drivers/usb/serial/ch348.c + +--- a/drivers/usb/serial/Kconfig ++++ b/drivers/usb/serial/Kconfig +@@ -112,6 +112,15 @@ config USB_SERIAL_CH341 + To compile this driver as a module, choose M here: the + module will be called ch341. + ++config USB_SERIAL_CH348 ++ tristate "USB Winchiphead CH348 Octo Port Serial Driver" ++ help ++ Say Y here if you want to use a Winchiphead CH348 octo port ++ USB to serial adapter. ++ ++ To compile this driver as a module, choose M here: the ++ module will be called ch348. ++ + config USB_SERIAL_WHITEHEAT + tristate "USB ConnectTech WhiteHEAT Serial Driver" + select USB_EZUSB_FX2 +--- a/drivers/usb/serial/Makefile ++++ b/drivers/usb/serial/Makefile +@@ -15,6 +15,7 @@ obj-$(CONFIG_USB_SERIAL_AIRCABLE) += ai + obj-$(CONFIG_USB_SERIAL_ARK3116) += ark3116.o + obj-$(CONFIG_USB_SERIAL_BELKIN) += belkin_sa.o + obj-$(CONFIG_USB_SERIAL_CH341) += ch341.o ++obj-$(CONFIG_USB_SERIAL_CH348) += ch348.o + obj-$(CONFIG_USB_SERIAL_CP210X) += cp210x.o + obj-$(CONFIG_USB_SERIAL_CYBERJACK) += cyberjack.o + obj-$(CONFIG_USB_SERIAL_CYPRESS_M8) += cypress_m8.o +--- /dev/null ++++ b/drivers/usb/serial/ch348.c +@@ -0,0 +1,725 @@ ++// SPDX-License-Identifier: GPL-2.0 ++/* ++ * USB serial driver for USB to Octal UARTs chip ch348. ++ * ++ * Copyright (C) 2022 Corentin Labbe ++ * With the help of Neil Armstrong ++ * and the help of Martin Blumenstingl ++ */ ++ ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++ ++#define CH348_CMD_TIMEOUT 2000 ++ ++#define CH348_CTO_D 0x01 ++#define CH348_CTO_R 0x02 ++ ++#define CH348_CTI_C 0x10 ++#define CH348_CTI_DSR 0x20 ++#define CH348_CTI_R 0x40 ++#define CH348_CTI_DCD 0x80 ++ ++#define CH348_LO 0x02 ++#define CH348_LP 0x04 ++#define CH348_LF 0x08 ++#define CH348_LB 0x10 ++ ++#define CMD_W_R 0xC0 ++#define CMD_W_BR 0x80 ++ ++#define CMD_WB_E 0x90 ++#define CMD_RB_E 0xC0 ++ ++#define M_NOR 0x00 ++#define M_HF 0x03 ++ ++#define R_MOD 0x97 ++#define R_IO_D 0x98 ++#define R_IO_O 0x99 ++#define R_IO_I 0x9b ++#define R_TM_O 0x9c ++#define R_INIT 0xa1 ++ ++#define R_C1 0x01 ++#define R_C2 0x02 ++#define R_C4 0x04 ++#define R_C5 0x06 ++ ++#define R_II_B1 0x06 ++#define R_II_B2 0x02 ++#define R_II_B3 0x00 ++ ++#define CMD_VER 0x96 ++ ++#define CH348_RX_PORT_CHUNK_LENGTH 32 ++#define CH348_RX_PORT_MAX_LENGTH 30 ++ ++struct ch348_rxbuf { ++ u8 port; ++ u8 length; ++ u8 data[CH348_RX_PORT_MAX_LENGTH]; ++} __packed; ++ ++struct ch348_txbuf { ++ u8 port; ++ __le16 length; ++ u8 data[]; ++} __packed; ++ ++#define CH348_TX_HDRSIZE offsetof(struct ch348_txbuf, data) ++ ++struct ch348_initbuf { ++ u8 cmd; ++ u8 reg; ++ u8 port; ++ __be32 baudrate; ++ u8 format; ++ u8 paritytype; ++ u8 databits; ++ u8 rate; ++ u8 unknown; ++} __packed; ++ ++#define CH348_MAXPORT 8 ++ ++/* ++ * The CH348 multiplexes rx & tx into a pair of Bulk USB endpoints for ++ * the 8 serial ports, and another pair of Bulk USB endpoints to ++ * set port settings and receive port status events. ++ * ++ * The USB serial cores ties every Bulk endpoints pairs to each ports, ++ * but in our case it will set port 0 with the rx/tx endpoints ++ * and port 1 with the setup/status endpoints. ++ * ++ * To still take advantage of the generic code, we (re-)initialize ++ * the USB serial port structure with the correct USB endpoint ++ * for read and write, and write proper process_read_urb() ++ * and prepare_write_buffer() to correctly (de-)multiplex data. ++ * Also we use a custom write() implementation to wait until the buffer ++ * has been fully transmitted to prevent TX buffer overruns. ++ */ ++ ++/* ++ * struct ch348_port - per-port information ++ * @uartmode: UART port current mode ++ * @write_completion: completion event when the TX buffer has been written out ++ */ ++struct ch348_port { ++ u8 uartmode; ++ struct completion write_completion; ++}; ++ ++/* ++ * struct ch348 - main container for all this driver information ++ * @udev: pointer to the CH348 USB device ++ * @ports: List of per-port information ++ * @serial: pointer to the serial structure ++ * @write_lock: protect against concurrent writes so we don't lose data ++ * @cmd_ep: endpoint number for configure operations ++ * @status_urb: URB for status ++ * @status_buffer: buffer used by status_urb ++ */ ++struct ch348 { ++ struct usb_device *udev; ++ struct ch348_port ports[CH348_MAXPORT]; ++ struct usb_serial *serial; ++ ++ struct mutex write_lock; ++ ++ int cmd_ep; ++ ++ struct urb *status_urb; ++ u8 status_buffer[]; ++}; ++ ++struct ch348_magic { ++ u8 action; ++ u8 reg; ++ u8 control; ++} __packed; ++ ++struct ch348_status_entry { ++ u8 portnum:4; ++ u8 unused:4; ++ u8 reg_iir; ++ union { ++ u8 lsr_signal; ++ u8 modem_signal; ++ u8 init_data[10]; ++ }; ++} __packed; ++ ++static void ch348_process_status_urb(struct urb *urb) ++{ ++ struct ch348_status_entry *status_entry; ++ struct ch348 *ch348 = urb->context; ++ int ret, status = urb->status; ++ struct usb_serial_port *port; ++ unsigned int i, status_len; ++ ++ switch (status) { ++ case 0: ++ /* success */ ++ break; ++ case -ECONNRESET: ++ case -ENOENT: ++ case -ESHUTDOWN: ++ /* this urb is terminated, clean up */ ++ dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n", ++ __func__, status); ++ return; ++ default: ++ dev_err(&urb->dev->dev, "%s - nonzero urb status received: %d\n", ++ __func__, status); ++ goto exit; ++ } ++ ++ if (urb->actual_length < 3) { ++ dev_warn(&ch348->udev->dev, ++ "Received too short status buffer with %u bytes\n", ++ urb->actual_length); ++ goto exit; ++ } ++ ++ for (i = 0; i < urb->actual_length;) { ++ status_entry = urb->transfer_buffer + i; ++ ++ if (status_entry->portnum >= CH348_MAXPORT) { ++ dev_warn(&ch348->udev->dev, ++ "Invalid port %d in status entry\n", ++ status_entry->portnum); ++ break; ++ } ++ ++ port = ch348->serial->port[status_entry->portnum]; ++ status_len = 3; ++ ++ if (!status_entry->reg_iir) { ++ dev_dbg(&port->dev, "Ignoring status with zero reg_iir\n"); ++ } else if (status_entry->reg_iir == R_INIT) { ++ status_len = 12; ++ } else if ((status_entry->reg_iir & 0x0f) == R_II_B1) { ++ if (status_entry->lsr_signal & CH348_LO) ++ port->icount.overrun++; ++ if (status_entry->lsr_signal & CH348_LP) ++ port->icount.parity++; ++ if (status_entry->lsr_signal & CH348_LF) ++ port->icount.frame++; ++ if (status_entry->lsr_signal & CH348_LF) ++ port->icount.brk++; ++ } else if ((status_entry->reg_iir & 0x0f) == R_II_B2) { ++ complete_all(&ch348->ports[status_entry->portnum].write_completion); ++ } else { ++ dev_warn(&port->dev, ++ "Unsupported status with reg_iir 0x%02x\n", ++ status_entry->reg_iir); ++ } ++ ++ usb_serial_debug_data(&port->dev, __func__, status_len, ++ urb->transfer_buffer + i); ++ ++ i += status_len; ++ } ++ ++exit: ++ ret = usb_submit_urb(urb, GFP_ATOMIC); ++ if (ret) ++ dev_err(&urb->dev->dev, "%s - usb_submit_urb failed; %d\n", ++ __func__, ret); ++} ++ ++/* ++ * Some values came from vendor tree, and we have no meaning for them, this ++ * function simply use them. ++ */ ++static int ch348_do_magic(struct ch348 *ch348, int portnum, u8 action, u8 reg, u8 control) ++{ ++ struct ch348_magic *buffer; ++ int ret, len; ++ ++ buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); ++ if (!buffer) ++ return -ENOMEM; ++ ++ if (portnum < 4) ++ reg += 0x10 * portnum; ++ else ++ reg += 0x10 * (portnum - 4) + 0x08; ++ ++ buffer->action = action; ++ buffer->reg = reg; ++ buffer->control = control; ++ ++ ret = usb_bulk_msg(ch348->udev, ch348->cmd_ep, buffer, 3, &len, ++ CH348_CMD_TIMEOUT); ++ if (ret) ++ dev_err(&ch348->udev->dev, "Failed to write magic err=%d\n", ret); ++ ++ kfree(buffer); ++ ++ return ret; ++} ++ ++static int ch348_configure(struct ch348 *ch348, int portnum) ++{ ++ int ret; ++ ++ ret = ch348_do_magic(ch348, portnum, CMD_W_R, R_C2, 0x87); ++ if (ret) ++ return ret; ++ ++ return ch348_do_magic(ch348, portnum, CMD_W_R, R_C4, 0x08); ++} ++ ++static void ch348_process_read_urb(struct urb *urb) ++{ ++ struct usb_serial_port *port = urb->context; ++ struct ch348 *ch348 = usb_get_serial_data(port->serial); ++ unsigned int portnum, usblen, i; ++ struct ch348_rxbuf *rxb; ++ ++ if (urb->actual_length < 2) { ++ dev_dbg(&ch348->udev->dev, "Empty rx buffer\n"); ++ return; ++ } ++ ++ for (i = 0; i < urb->actual_length; i += CH348_RX_PORT_CHUNK_LENGTH) { ++ rxb = urb->transfer_buffer + i; ++ portnum = rxb->port; ++ if (portnum >= CH348_MAXPORT) { ++ dev_dbg(&ch348->udev->dev, "Invalid port %d\n", portnum); ++ break; ++ } ++ ++ port = ch348->serial->port[portnum]; ++ ++ usblen = rxb->length; ++ if (usblen > CH348_RX_PORT_MAX_LENGTH) { ++ dev_dbg(&port->dev, "Invalid length %d for port %d\n", ++ usblen, portnum); ++ break; ++ } ++ ++ tty_insert_flip_string(&port->port, rxb->data, usblen); ++ tty_flip_buffer_push(&port->port); ++ port->icount.rx += usblen; ++ usb_serial_debug_data(&port->dev, __func__, usblen, rxb->data); ++ } ++} ++ ++static int ch348_prepare_write_buffer(struct usb_serial_port *port, void *dest, size_t size) ++{ ++ struct ch348_txbuf *rxt = dest; ++ int count; ++ ++ count = kfifo_out_locked(&port->write_fifo, rxt->data, ++ size - CH348_TX_HDRSIZE, &port->lock); ++ ++ rxt->port = port->port_number; ++ rxt->length = cpu_to_le16(count); ++ ++ return count + CH348_TX_HDRSIZE; ++} ++ ++static int ch348_write(struct tty_struct *tty, struct usb_serial_port *port, ++ const unsigned char *buf, int count) ++{ ++ struct ch348 *ch348 = usb_get_serial_data(port->serial); ++ struct ch348_port *ch348_port = &ch348->ports[port->port_number]; ++ int ret, max_tx_size; ++ ++ if (tty_get_baud_rate(tty) < 9600 && count >= 128) ++ /* ++ * Writing larger buffers can take longer than the hardware ++ * allows before discarding the write buffer. Limit the ++ * transfer size in such cases. ++ * These values have been found by empirical testing. ++ */ ++ max_tx_size = 128; ++ else ++ /* ++ * Only ingest as many bytes as we can transfer with one URB at ++ * a time. Once an URB has been written we need to wait for the ++ * R_II_B2 status event before we are allowed to send more data. ++ * If we ingest more data then usb_serial_generic_write() will ++ * internally try to process as much data as possible with any ++ * number of URBs without giving us the chance to wait in ++ * between transfers. ++ */ ++ max_tx_size = port->bulk_out_size - CH348_TX_HDRSIZE; ++ ++ reinit_completion(&ch348_port->write_completion); ++ ++ mutex_lock(&ch348->write_lock); ++ ++ /* ++ * For any (remaining) bytes that we did not transfer TTY core will ++ * call us again, with the buffer and count adjusted to the remaining ++ * data. ++ */ ++ ret = usb_serial_generic_write(tty, port, buf, min(count, max_tx_size)); ++ ++ mutex_unlock(&ch348->write_lock); ++ ++ if (ret <= 0) ++ return ret; ++ ++ if (!wait_for_completion_interruptible_timeout(&ch348_port->write_completion, ++ msecs_to_jiffies(CH348_CMD_TIMEOUT))) { ++ dev_err_console(port, "Failed to wait for TX buffer flush\n"); ++ return -ETIMEDOUT; ++ } ++ ++ return ret; ++} ++ ++static int ch348_set_uartmode(struct ch348 *ch348, int portnum, u8 mode) ++{ ++ int ret; ++ ++ if (ch348->ports[portnum].uartmode == M_NOR && mode == M_HF) { ++ ret = ch348_do_magic(ch348, portnum, CMD_W_BR, R_C4, 0x51); ++ if (ret) ++ return ret; ++ ch348->ports[portnum].uartmode = M_HF; ++ } ++ ++ if (ch348->ports[portnum].uartmode == M_HF && mode == M_NOR) { ++ ret = ch348_do_magic(ch348, portnum, CMD_W_BR, R_C4, 0x50); ++ if (ret) ++ return ret; ++ ch348->ports[portnum].uartmode = M_NOR; ++ } ++ return 0; ++} ++ ++static void ch348_set_termios(struct tty_struct *tty, struct usb_serial_port *port, ++ const struct ktermios *termios_old) ++{ ++ struct ch348 *ch348 = usb_get_serial_data(port->serial); ++ struct ktermios *termios = &tty->termios; ++ int ret, portnum = port->port_number; ++ struct ch348_initbuf *buffer; ++ speed_t baudrate; ++ u8 format; ++ ++ if (termios_old && !tty_termios_hw_change(&tty->termios, termios_old)) ++ return; ++ ++ buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); ++ if (!buffer) { ++ if (termios_old) ++ tty->termios = *termios_old; ++ return; ++ } ++ ++ /* ++ * The datasheet states that only baud rates in range of 1200..6000000 ++ * are supported. Tests however show that even baud rates as low as 50 ++ * and as high as 12000000 are working in practice. ++ */ ++ baudrate = clamp(tty_get_baud_rate(tty), 50, 12000000); ++ ++ format = termios->c_cflag & CSTOPB ? 2 : 1; ++ ++ buffer->paritytype = 0; ++ if (termios->c_cflag & PARENB) { ++ if (termios->c_cflag & PARODD) ++ buffer->paritytype += 1; ++ else ++ buffer->paritytype += 2; ++ if (termios->c_cflag & CMSPAR) ++ buffer->paritytype += 2; ++ } ++ ++ switch (C_CSIZE(tty)) { ++ case CS5: ++ buffer->databits = 5; ++ break; ++ case CS6: ++ buffer->databits = 6; ++ break; ++ case CS7: ++ buffer->databits = 7; ++ break; ++ case CS8: ++ default: ++ buffer->databits = 8; ++ break; ++ } ++ buffer->cmd = CMD_WB_E | (portnum & 0x0F); ++ buffer->reg = R_INIT; ++ buffer->port = portnum; ++ buffer->baudrate = cpu_to_be32(baudrate); ++ ++ if (format == 2) ++ buffer->format = 0x02; ++ else if (format == 1) ++ buffer->format = 0x00; ++ ++ buffer->rate = max_t(speed_t, 5, (10000 * 15 / baudrate) + 1); ++ ++ ret = usb_bulk_msg(ch348->udev, ch348->cmd_ep, buffer, ++ sizeof(*buffer), NULL, CH348_CMD_TIMEOUT); ++ if (ret < 0) { ++ dev_err(&ch348->udev->dev, "Failed to change line settings: err=%d\n", ++ ret); ++ goto out; ++ } ++ ++ ret = ch348_do_magic(ch348, portnum, CMD_W_R, R_C1, 0x0F); ++ if (ret < 0) ++ goto out; ++ ++ if (C_CRTSCTS(tty)) ++ ret = ch348_set_uartmode(ch348, portnum, M_HF); ++ else ++ ret = ch348_set_uartmode(ch348, portnum, M_NOR); ++ ++out: ++ kfree(buffer); ++} ++ ++static int ch348_open(struct tty_struct *tty, struct usb_serial_port *port) ++{ ++ struct ch348 *ch348 = usb_get_serial_data(port->serial); ++ int ret; ++ ++ if (tty) ++ ch348_set_termios(tty, port, NULL); ++ ++ ret = ch348_configure(ch348, port->port_number); ++ if (ret) { ++ dev_err(&ch348->udev->dev, "Fail to configure err=%d\n", ret); ++ return ret; ++ } ++ ++ return usb_serial_generic_open(tty, port); ++} ++ ++static int ch348_attach(struct usb_serial *serial) ++{ ++ struct usb_endpoint_descriptor *epcmd, *epstatus; ++ struct usb_serial_port *port0 = serial->port[1]; ++ struct usb_device *usb_dev = serial->dev; ++ int status_buffer_size, i, ret; ++ struct usb_interface *intf; ++ struct ch348 *ch348; ++ ++ intf = usb_ifnum_to_if(usb_dev, 0); ++ epstatus = &intf->cur_altsetting->endpoint[2].desc; ++ epcmd = &intf->cur_altsetting->endpoint[3].desc; ++ ++ status_buffer_size = usb_endpoint_maxp(epstatus); ++ ++ ch348 = kzalloc(struct_size(ch348, status_buffer, status_buffer_size), ++ GFP_KERNEL); ++ if (!ch348) ++ return -ENOMEM; ++ ++ usb_set_serial_data(serial, ch348); ++ ++ ch348->udev = serial->dev; ++ ch348->serial = serial; ++ mutex_init(&ch348->write_lock); ++ ++ for (i = 0; i < CH348_MAXPORT; i++) ++ init_completion(&ch348->ports[i].write_completion); ++ ++ ch348->status_urb = usb_alloc_urb(0, GFP_KERNEL); ++ if (!ch348->status_urb) { ++ ret = -ENOMEM; ++ goto err_free_ch348; ++ } ++ ++ usb_fill_bulk_urb(ch348->status_urb, ch348->udev, ++ usb_rcvbulkpipe(ch348->udev, epstatus->bEndpointAddress), ++ ch348->status_buffer, status_buffer_size, ++ ch348_process_status_urb, ch348); ++ ++ ret = usb_submit_urb(ch348->status_urb, GFP_KERNEL); ++ if (ret) { ++ dev_err(&ch348->udev->dev, ++ "%s - failed to submit status/interrupt urb %i\n", ++ __func__, ret); ++ goto err_free_status_urb; ++ } ++ ++ ret = usb_serial_generic_submit_read_urbs(port0, GFP_KERNEL); ++ if (ret) ++ goto err_kill_status_urb; ++ ++ ch348->cmd_ep = usb_sndbulkpipe(usb_dev, epcmd->bEndpointAddress); ++ ++ return 0; ++ ++err_kill_status_urb: ++ usb_kill_urb(ch348->status_urb); ++err_free_status_urb: ++ usb_free_urb(ch348->status_urb); ++err_free_ch348: ++ kfree(ch348); ++ return ret; ++} ++ ++static void ch348_release(struct usb_serial *serial) ++{ ++ struct ch348 *ch348 = usb_get_serial_data(serial); ++ ++ usb_kill_urb(ch348->status_urb); ++ usb_free_urb(ch348->status_urb); ++ ++ kfree(ch348); ++} ++ ++static void ch348_print_version(struct usb_serial *serial) ++{ ++ u8 *version_buf; ++ int ret; ++ ++ version_buf = kzalloc(4, GFP_KERNEL); ++ if (!version_buf) ++ return; ++ ++ ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), ++ CMD_VER, ++ USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, ++ 0, 0, version_buf, 4, CH348_CMD_TIMEOUT); ++ if (ret < 0) ++ dev_dbg(&serial->dev->dev, "Failed to read CMD_VER: %d\n", ret); ++ else ++ dev_info(&serial->dev->dev, "Found WCH CH348%s\n", ++ (version_buf[1] & 0x80) ? "Q" : "L"); ++ ++ kfree(version_buf); ++} ++ ++static int ch348_probe(struct usb_serial *serial, const struct usb_device_id *id) ++{ ++ struct usb_endpoint_descriptor *epread, *epwrite, *epstatus, *epcmd; ++ struct usb_device *usb_dev = serial->dev; ++ struct usb_interface *intf; ++ int ret; ++ ++ intf = usb_ifnum_to_if(usb_dev, 0); ++ ++ ret = usb_find_common_endpoints(intf->cur_altsetting, &epread, &epwrite, ++ NULL, NULL); ++ if (ret) { ++ dev_err(&serial->dev->dev, "Failed to find basic endpoints ret=%d\n", ret); ++ return ret; ++ } ++ ++ epstatus = &intf->cur_altsetting->endpoint[2].desc; ++ if (!usb_endpoint_is_bulk_in(epstatus)) { ++ dev_err(&serial->dev->dev, "Missing second bulk in (STATUS/INT)\n"); ++ return -ENODEV; ++ } ++ ++ epcmd = &intf->cur_altsetting->endpoint[3].desc; ++ if (!usb_endpoint_is_bulk_out(epcmd)) { ++ dev_err(&serial->dev->dev, "Missing second bulk out (CMD)\n"); ++ return -ENODEV; ++ } ++ ++ ch348_print_version(serial); ++ ++ return 0; ++} ++ ++static int ch348_calc_num_ports(struct usb_serial *serial, ++ struct usb_serial_endpoints *epds) ++{ ++ int i; ++ ++ for (i = 1; i < CH348_MAXPORT; ++i) { ++ epds->bulk_out[i] = epds->bulk_out[0]; ++ epds->bulk_in[i] = epds->bulk_in[0]; ++ } ++ ++ epds->num_bulk_out = CH348_MAXPORT; ++ epds->num_bulk_in = CH348_MAXPORT; ++ ++ return CH348_MAXPORT; ++} ++ ++static int ch348_suspend(struct usb_serial *serial, pm_message_t message) ++{ ++ struct ch348 *ch348 = usb_get_serial_data(serial); ++ ++ usb_kill_urb(ch348->status_urb); ++ ++ return 0; ++} ++ ++static int ch348_resume(struct usb_serial *serial) ++{ ++ struct ch348 *ch348 = usb_get_serial_data(serial); ++ int ret; ++ ++ ret = usb_submit_urb(ch348->status_urb, GFP_KERNEL); ++ if (ret) { ++ dev_err(&ch348->udev->dev, ++ "%s - failed to submit status/interrupt urb %i\n", ++ __func__, ret); ++ return ret; ++ } ++ ++ ret = usb_serial_generic_resume(serial); ++ if (ret) ++ usb_kill_urb(ch348->status_urb); ++ ++ return ret; ++} ++ ++static const struct usb_device_id ch348_ids[] = { ++ { USB_DEVICE(0x1a86, 0x55d9), }, ++ { /* sentinel */ } ++}; ++ ++MODULE_DEVICE_TABLE(usb, ch348_ids); ++ ++static struct usb_serial_driver ch348_device = { ++ .driver = { ++ .owner = THIS_MODULE, ++ .name = "ch348", ++ }, ++ .id_table = ch348_ids, ++ .num_ports = CH348_MAXPORT, ++ .num_bulk_in = 1, ++ .num_bulk_out = 1, ++ .open = ch348_open, ++ .set_termios = ch348_set_termios, ++ .process_read_urb = ch348_process_read_urb, ++ .prepare_write_buffer = ch348_prepare_write_buffer, ++ .write = ch348_write, ++ .probe = ch348_probe, ++ .calc_num_ports = ch348_calc_num_ports, ++ .attach = ch348_attach, ++ .release = ch348_release, ++ .suspend = ch348_suspend, ++ .resume = ch348_resume, ++}; ++ ++static struct usb_serial_driver * const serial_drivers[] = { ++ &ch348_device, NULL ++}; ++ ++module_usb_serial_driver(serial_drivers, ch348_ids); ++ ++MODULE_AUTHOR("Corentin Labbe "); ++MODULE_DESCRIPTION("USB CH348 Octo port serial converter driver"); ++MODULE_LICENSE("GPL"); -- 2.30.2