diff options
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/serial/ch341.c | 85 |
1 files changed, 26 insertions, 59 deletions
diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c index 2db917eab799..29f4b87a9e74 100644 --- a/drivers/usb/serial/ch341.c +++ b/drivers/usb/serial/ch341.c @@ -131,17 +131,11 @@ static int ch341_control_in(struct usb_device *dev, dev_dbg(&dev->dev, "%s - (%02x,%04x,%04x,%u)\n", __func__, request, value, index, bufsize); - r = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), request, - USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, - value, index, buf, bufsize, DEFAULT_TIMEOUT); - if (r < (int)bufsize) { - if (r >= 0) { - dev_err(&dev->dev, - "short control message received (%d < %u)\n", - r, bufsize); - r = -EIO; - } - + r = usb_control_msg_recv(dev, 0, request, + USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, + value, index, buf, bufsize, DEFAULT_TIMEOUT, + GFP_KERNEL); + if (r) { dev_err(&dev->dev, "failed to receive control message: %d\n", r); return r; @@ -287,24 +281,19 @@ static int ch341_set_handshake(struct usb_device *dev, u8 control) static int ch341_get_status(struct usb_device *dev, struct ch341_private *priv) { const unsigned int size = 2; - char *buffer; + u8 buffer[2]; int r; unsigned long flags; - buffer = kmalloc(size, GFP_KERNEL); - if (!buffer) - return -ENOMEM; - r = ch341_control_in(dev, CH341_REQ_READ_REG, 0x0706, 0, buffer, size); - if (r < 0) - goto out; + if (r) + return r; spin_lock_irqsave(&priv->lock, flags); priv->msr = (~(*buffer)) & CH341_BITS_MODEM_STAT; spin_unlock_irqrestore(&priv->lock, flags); -out: kfree(buffer); - return r; + return 0; } /* -------------------------------------------------------------------------- */ @@ -312,31 +301,28 @@ out: kfree(buffer); static int ch341_configure(struct usb_device *dev, struct ch341_private *priv) { const unsigned int size = 2; - char *buffer; + u8 buffer[2]; int r; - buffer = kmalloc(size, GFP_KERNEL); - if (!buffer) - return -ENOMEM; - /* expect two bytes 0x27 0x00 */ r = ch341_control_in(dev, CH341_REQ_READ_VERSION, 0, 0, buffer, size); - if (r < 0) - goto out; + if (r) + return r; dev_dbg(&dev->dev, "Chip version: 0x%02x\n", buffer[0]); r = ch341_control_out(dev, CH341_REQ_SERIAL_INIT, 0, 0); if (r < 0) - goto out; + return r; r = ch341_set_baudrate_lcr(dev, priv, priv->baud_rate, priv->lcr); if (r < 0) - goto out; + return r; r = ch341_set_handshake(dev, priv->mcr); + if (r < 0) + return r; -out: kfree(buffer); - return r; + return 0; } static int ch341_detect_quirks(struct usb_serial_port *port) @@ -345,40 +331,27 @@ static int ch341_detect_quirks(struct usb_serial_port *port) struct usb_device *udev = port->serial->dev; const unsigned int size = 2; unsigned long quirks = 0; - char *buffer; + u8 buffer[2]; int r; - buffer = kmalloc(size, GFP_KERNEL); - if (!buffer) - return -ENOMEM; - /* * A subset of CH34x devices does not support all features. The * prescaler is limited and there is no support for sending a RS232 * break condition. A read failure when trying to set up the latter is * used to detect these devices. */ - r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), CH341_REQ_READ_REG, - USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, - CH341_REG_BREAK, 0, buffer, size, DEFAULT_TIMEOUT); + r = usb_control_msg_recv(udev, 0, CH341_REQ_READ_REG, + USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, + CH341_REG_BREAK, 0, &buffer, size, + DEFAULT_TIMEOUT, GFP_KERNEL); if (r == -EPIPE) { dev_info(&port->dev, "break control not supported, using simulated break\n"); quirks = CH341_QUIRK_LIMITED_PRESCALER | CH341_QUIRK_SIMULATE_BREAK; r = 0; - goto out; - } - - if (r != size) { - if (r >= 0) - r = -EIO; + } else if (r) { dev_err(&port->dev, "failed to read break control: %d\n", r); - goto out; } - r = 0; -out: - kfree(buffer); - if (quirks) { dev_dbg(&port->dev, "enabling quirk flags: 0x%02lx\n", quirks); priv->quirks |= quirks; @@ -647,23 +620,19 @@ static void ch341_break_ctl(struct tty_struct *tty, int break_state) struct ch341_private *priv = usb_get_serial_port_data(port); int r; uint16_t reg_contents; - uint8_t *break_reg; + uint8_t break_reg[2]; if (priv->quirks & CH341_QUIRK_SIMULATE_BREAK) { ch341_simulate_break(tty, break_state); return; } - break_reg = kmalloc(2, GFP_KERNEL); - if (!break_reg) - return; - r = ch341_control_in(port->serial->dev, CH341_REQ_READ_REG, ch341_break_reg, 0, break_reg, 2); - if (r < 0) { + if (r) { dev_err(&port->dev, "%s - USB control read error (%d)\n", __func__, r); - goto out; + return; } dev_dbg(&port->dev, "%s - initial ch341 break register contents - reg1: %x, reg2: %x\n", __func__, break_reg[0], break_reg[1]); @@ -684,8 +653,6 @@ static void ch341_break_ctl(struct tty_struct *tty, int break_state) if (r < 0) dev_err(&port->dev, "%s - USB control write error (%d)\n", __func__, r); -out: - kfree(break_reg); } static int ch341_tiocmset(struct tty_struct *tty, |