From patchwork Fri Jun 2 12:46:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 688992 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D858FC7EE24 for ; Fri, 2 Jun 2023 12:47:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234294AbjFBMrA (ORCPT ); Fri, 2 Jun 2023 08:47:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46510 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235687AbjFBMqx (ORCPT ); Fri, 2 Jun 2023 08:46:53 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C69B41A8; Fri, 2 Jun 2023 05:46:49 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 2C5D865009; Fri, 2 Jun 2023 12:46:49 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 45EE4C4339B; Fri, 2 Jun 2023 12:46:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1685710008; bh=DLwXq+7pQ7yZ0OAr8L3ueNBu2fKEjxSKnV84XqdOJ7Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bpoYXYVBjOWHsxHfOXOLH1I6dp39CAMaqhjjV7yiMQJ3Drz2q77qu+dBlFBqEEQbo lXst61gS+YCgbVHRZm4rR6ty1soQEjZSvJIrrrIsoCGehTuWXNqtR0z5eZu/TTn28k eev3W0PCbH/GTNyxlzSe1TZo65QH7I1Iaw4FjAcZD/dAeYuUNuxn/sFNcltFCdCDqJ MhrnB+Rs71APe/6/mRofvVFalJ9fRYQ4j7Xvknr7D38dBdDWMUDXE7xb7LY3D09WjS TFeRxjPEELcm1A2HdhugnLrkJZ45h4yR7oTyef4d4ySp17ooMe+Ac2NsxbFdkXLHZT OxD4B7SeADeOg== Received: from johan by xi.lan with local (Exim 4.94.2) (envelope-from ) id 1q54BG-0004xz-0R; Fri, 02 Jun 2023 14:46:58 +0200 From: Johan Hovold To: Johan Hovold Cc: Greg Kroah-Hartman , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Corey Minyard Subject: [PATCH 1/3] USB: serial: return errors from break handling Date: Fri, 2 Jun 2023 14:46:40 +0200 Message-Id: <20230602124642.19076-2-johan@kernel.org> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20230602124642.19076-1-johan@kernel.org> References: <20230602124642.19076-1-johan@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Start propagating errors to user space when setting the break state fails. This will be used by follow-on changes to also report when a driver or device does not support break control. Signed-off-by: Johan Hovold --- drivers/usb/serial/ark3116.c | 7 +++-- drivers/usb/serial/belkin_sa.c | 12 ++++++--- drivers/usb/serial/ch341.c | 37 +++++++++++++++++---------- drivers/usb/serial/cp210x.c | 8 +++--- drivers/usb/serial/digi_acceleport.c | 7 ++--- drivers/usb/serial/f81232.c | 4 ++- drivers/usb/serial/f81534.c | 4 ++- drivers/usb/serial/ftdi_sio.c | 10 +++++--- drivers/usb/serial/io_edgeport.c | 4 ++- drivers/usb/serial/io_ti.c | 9 +++++-- drivers/usb/serial/keyspan.c | 5 +++- drivers/usb/serial/keyspan_pda.c | 8 ++++-- drivers/usb/serial/mct_u232.c | 6 ++--- drivers/usb/serial/mos7720.c | 9 ++++--- drivers/usb/serial/mos7840.c | 7 ++--- drivers/usb/serial/mxuport.c | 6 ++--- drivers/usb/serial/pl2303.c | 14 ++++++---- drivers/usb/serial/quatech2.c | 8 ++++-- drivers/usb/serial/ti_usb_3410_5052.c | 10 +++++--- drivers/usb/serial/upd78f0730.c | 7 +++-- drivers/usb/serial/usb-serial.c | 2 +- drivers/usb/serial/usb_debug.c | 13 +++++++--- drivers/usb/serial/whiteheat.c | 7 ++--- drivers/usb/serial/xr_serial.c | 4 +-- include/linux/usb/serial.h | 2 +- 25 files changed, 139 insertions(+), 71 deletions(-) diff --git a/drivers/usb/serial/ark3116.c b/drivers/usb/serial/ark3116.c index 9452291f1703..67a07cc007f0 100644 --- a/drivers/usb/serial/ark3116.c +++ b/drivers/usb/serial/ark3116.c @@ -433,10 +433,11 @@ static int ark3116_tiocmset(struct tty_struct *tty, return 0; } -static void ark3116_break_ctl(struct tty_struct *tty, int break_state) +static int ark3116_break_ctl(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; struct ark3116_private *priv = usb_get_serial_port_data(port); + int ret; /* LCR is also used for other things: protect access */ mutex_lock(&priv->hw_lock); @@ -446,9 +447,11 @@ static void ark3116_break_ctl(struct tty_struct *tty, int break_state) else priv->lcr &= ~UART_LCR_SBC; - ark3116_write_reg(port->serial, UART_LCR, priv->lcr); + ret = ark3116_write_reg(port->serial, UART_LCR, priv->lcr); mutex_unlock(&priv->hw_lock); + + return ret; } static void ark3116_update_msr(struct usb_serial_port *port, __u8 msr) diff --git a/drivers/usb/serial/belkin_sa.c b/drivers/usb/serial/belkin_sa.c index 9331a562dac0..cf47ee4ae5d3 100644 --- a/drivers/usb/serial/belkin_sa.c +++ b/drivers/usb/serial/belkin_sa.c @@ -46,7 +46,7 @@ static void belkin_sa_process_read_urb(struct urb *urb); static void belkin_sa_set_termios(struct tty_struct *tty, struct usb_serial_port *port, const struct ktermios *old_termios); -static void belkin_sa_break_ctl(struct tty_struct *tty, int break_state); +static int belkin_sa_break_ctl(struct tty_struct *tty, int break_state); static int belkin_sa_tiocmget(struct tty_struct *tty); static int belkin_sa_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear); @@ -399,13 +399,19 @@ static void belkin_sa_set_termios(struct tty_struct *tty, spin_unlock_irqrestore(&priv->lock, flags); } -static void belkin_sa_break_ctl(struct tty_struct *tty, int break_state) +static int belkin_sa_break_ctl(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; struct usb_serial *serial = port->serial; + int ret; - if (BSA_USB_CMD(BELKIN_SA_SET_BREAK_REQUEST, break_state ? 1 : 0) < 0) + ret = BSA_USB_CMD(BELKIN_SA_SET_BREAK_REQUEST, break_state ? 1 : 0); + if (ret < 0) { dev_err(&port->dev, "Set break_ctl %d\n", break_state); + return ret; + } + + return 0; } static int belkin_sa_tiocmget(struct tty_struct *tty) diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c index 6e1b87e67304..612bea504d7a 100644 --- a/drivers/usb/serial/ch341.c +++ b/drivers/usb/serial/ch341.c @@ -562,12 +562,12 @@ static void ch341_set_termios(struct tty_struct *tty, * TCSBRKP. Due to how the simulation is implemented the duration can't be * controlled. The duration is always about (1s / 46bd * 9bit) = 196ms. */ -static void ch341_simulate_break(struct tty_struct *tty, int break_state) +static int ch341_simulate_break(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; struct ch341_private *priv = usb_get_serial_port_data(port); unsigned long now, delay; - int r; + int r, r2; if (break_state != 0) { dev_dbg(&port->dev, "enter break state requested\n"); @@ -599,7 +599,7 @@ static void ch341_simulate_break(struct tty_struct *tty, int break_state) */ priv->break_end = jiffies + (11 * HZ / CH341_MIN_BPS); - return; + return 0; } dev_dbg(&port->dev, "leave break state requested\n"); @@ -615,17 +615,22 @@ static void ch341_simulate_break(struct tty_struct *tty, int break_state) schedule_timeout_interruptible(delay); } + r = 0; restore: /* Restore original baud rate */ - r = ch341_set_baudrate_lcr(port->serial->dev, priv, priv->baud_rate, - priv->lcr); - if (r < 0) + r2 = ch341_set_baudrate_lcr(port->serial->dev, priv, priv->baud_rate, + priv->lcr); + if (r2 < 0) { dev_err(&port->dev, "restoring original baud rate of %u failed: %d\n", - priv->baud_rate, r); + priv->baud_rate, r2); + return r2; + } + + return r; } -static void ch341_break_ctl(struct tty_struct *tty, int break_state) +static int ch341_break_ctl(struct tty_struct *tty, int break_state) { const uint16_t ch341_break_reg = ((uint16_t) CH341_REG_LCR << 8) | CH341_REG_BREAK; @@ -635,17 +640,17 @@ static void ch341_break_ctl(struct tty_struct *tty, int break_state) uint16_t reg_contents; uint8_t break_reg[2]; - if (priv->quirks & CH341_QUIRK_SIMULATE_BREAK) { - ch341_simulate_break(tty, break_state); - return; - } + if (priv->quirks & CH341_QUIRK_SIMULATE_BREAK) + return ch341_simulate_break(tty, break_state); r = ch341_control_in(port->serial->dev, CH341_REQ_READ_REG, ch341_break_reg, 0, break_reg, 2); if (r) { dev_err(&port->dev, "%s - USB control read error (%d)\n", __func__, r); - return; + if (r > 0) + r = -EIO; + return r; } dev_dbg(&port->dev, "%s - initial ch341 break register contents - reg1: %x, reg2: %x\n", __func__, break_reg[0], break_reg[1]); @@ -663,9 +668,13 @@ static void ch341_break_ctl(struct tty_struct *tty, int break_state) reg_contents = get_unaligned_le16(break_reg); r = ch341_control_out(port->serial->dev, CH341_REQ_WRITE_REG, ch341_break_reg, reg_contents); - if (r < 0) + if (r < 0) { dev_err(&port->dev, "%s - USB control write error (%d)\n", __func__, r); + return r; + } + + return 0; } static int ch341_tiocmset(struct tty_struct *tty, diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c index cdea1bff3b70..81e49ed9d147 100644 --- a/drivers/usb/serial/cp210x.c +++ b/drivers/usb/serial/cp210x.c @@ -39,7 +39,7 @@ 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_break_ctl(struct tty_struct *, int); static int cp210x_attach(struct usb_serial *); static void cp210x_disconnect(struct usb_serial *); static void cp210x_release(struct usb_serial *); @@ -1434,7 +1434,7 @@ static int cp210x_tiocmget(struct tty_struct *tty) return result; } -static void cp210x_break_ctl(struct tty_struct *tty, int break_state) +static int cp210x_break_ctl(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; u16 state; @@ -1443,9 +1443,11 @@ static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 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); + + return cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); } #ifdef CONFIG_GPIOLIB diff --git a/drivers/usb/serial/digi_acceleport.c b/drivers/usb/serial/digi_acceleport.c index 45d688e9b93f..d1dea3850576 100644 --- a/drivers/usb/serial/digi_acceleport.c +++ b/drivers/usb/serial/digi_acceleport.c @@ -217,7 +217,7 @@ static void digi_rx_unthrottle(struct tty_struct *tty); static void digi_set_termios(struct tty_struct *tty, struct usb_serial_port *port, const struct ktermios *old_termios); -static void digi_break_ctl(struct tty_struct *tty, int break_state); +static int digi_break_ctl(struct tty_struct *tty, int break_state); static int digi_tiocmget(struct tty_struct *tty); static int digi_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear); @@ -839,7 +839,7 @@ static void digi_set_termios(struct tty_struct *tty, } -static void digi_break_ctl(struct tty_struct *tty, int break_state) +static int digi_break_ctl(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; unsigned char buf[4]; @@ -848,7 +848,8 @@ static void digi_break_ctl(struct tty_struct *tty, int break_state) buf[1] = 2; /* length */ buf[2] = break_state ? 1 : 0; buf[3] = 0; /* pad */ - digi_write_inb_command(port, buf, 4, 0); + + return digi_write_inb_command(port, buf, 4, 0); } diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c index 891fb1fe69df..5f7a46bcace6 100644 --- a/drivers/usb/serial/f81232.c +++ b/drivers/usb/serial/f81232.c @@ -448,7 +448,7 @@ static void f81534a_process_read_urb(struct urb *urb) tty_flip_buffer_push(&port->port); } -static void f81232_break_ctl(struct tty_struct *tty, int break_state) +static int f81232_break_ctl(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; struct f81232_private *priv = usb_get_serial_port_data(port); @@ -467,6 +467,8 @@ static void f81232_break_ctl(struct tty_struct *tty, int break_state) dev_err(&port->dev, "set break failed: %d\n", status); mutex_unlock(&priv->lock); + + return status; } static int f81232_find_clk(speed_t baudrate) diff --git a/drivers/usb/serial/f81534.c b/drivers/usb/serial/f81534.c index 4083ae961be4..ef126cd3d94f 100644 --- a/drivers/usb/serial/f81534.c +++ b/drivers/usb/serial/f81534.c @@ -656,7 +656,7 @@ static int f81534_set_port_config(struct usb_serial_port *port, return status; } -static void f81534_break_ctl(struct tty_struct *tty, int break_state) +static int 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); @@ -675,6 +675,8 @@ static void f81534_break_ctl(struct tty_struct *tty, int break_state) dev_err(&port->dev, "set break failed: %d\n", status); mutex_unlock(&port_priv->lcr_mutex); + + return status; } static int f81534_update_mctrl(struct usb_serial_port *port, unsigned int set, diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c index 05e28a5ce42b..1bf23611be12 100644 --- a/drivers/usb/serial/ftdi_sio.c +++ b/drivers/usb/serial/ftdi_sio.c @@ -2550,11 +2550,12 @@ static void ftdi_process_read_urb(struct urb *urb) tty_flip_buffer_push(&port->port); } -static void ftdi_break_ctl(struct tty_struct *tty, int break_state) +static int ftdi_break_ctl(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; struct ftdi_private *priv = usb_get_serial_port_data(port); u16 value; + int ret; /* break_state = -1 to turn on break, and 0 to turn off break */ /* see drivers/char/tty_io.c to see it used */ @@ -2565,19 +2566,22 @@ static void ftdi_break_ctl(struct tty_struct *tty, int break_state) else value = priv->last_set_data_value; - if (usb_control_msg(port->serial->dev, + ret = usb_control_msg(port->serial->dev, usb_sndctrlpipe(port->serial->dev, 0), FTDI_SIO_SET_DATA_REQUEST, FTDI_SIO_SET_DATA_REQUEST_TYPE, value, priv->channel, - NULL, 0, WDR_TIMEOUT) < 0) { + NULL, 0, WDR_TIMEOUT); + if (ret < 0) { dev_err(&port->dev, "%s FAILED to enable/disable break state (state was %d)\n", __func__, break_state); + return ret; } dev_dbg(&port->dev, "%s break state is %d - urb is %d\n", __func__, break_state, value); + return 0; } static bool ftdi_tx_empty(struct usb_serial_port *port) diff --git a/drivers/usb/serial/io_edgeport.c b/drivers/usb/serial/io_edgeport.c index 3a4c0febf335..977468d2ab26 100644 --- a/drivers/usb/serial/io_edgeport.c +++ b/drivers/usb/serial/io_edgeport.c @@ -1560,7 +1560,7 @@ static int edge_ioctl(struct tty_struct *tty, * SerialBreak * this function sends a break to the port *****************************************************************************/ -static void edge_break(struct tty_struct *tty, int break_state) +static int edge_break(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; struct edgeport_port *edge_port = usb_get_serial_port_data(port); @@ -1597,6 +1597,8 @@ static void edge_break(struct tty_struct *tty, int break_state) dev_dbg(&port->dev, "%s - error sending break set/clear command.\n", __func__); } + + return status; } diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c index bc3c24ea42c1..7a3a6e539456 100644 --- a/drivers/usb/serial/io_ti.c +++ b/drivers/usb/serial/io_ti.c @@ -2421,7 +2421,7 @@ static int edge_tiocmget(struct tty_struct *tty) return result; } -static void edge_break(struct tty_struct *tty, int break_state) +static int edge_break(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; struct edgeport_port *edge_port = usb_get_serial_port_data(port); @@ -2430,10 +2430,15 @@ static void edge_break(struct tty_struct *tty, int break_state) if (break_state == -1) bv = 1; /* On */ + status = ti_do_config(edge_port, UMPC_SET_CLR_BREAK, bv); - if (status) + if (status) { dev_dbg(&port->dev, "%s - error %d sending break set/clear command.\n", __func__, status); + return status; + } + + return 0; } static void edge_heartbeat_schedule(struct edgeport_serial *edge_serial) diff --git a/drivers/usb/serial/keyspan.c b/drivers/usb/serial/keyspan.c index 2966e0c4941e..93b17e0e05a3 100644 --- a/drivers/usb/serial/keyspan.c +++ b/drivers/usb/serial/keyspan.c @@ -599,7 +599,7 @@ struct keyspan_port_private { #include "keyspan_usa67msg.h" -static void keyspan_break_ctl(struct tty_struct *tty, int break_state) +static int keyspan_break_ctl(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; struct keyspan_port_private *p_priv; @@ -611,7 +611,10 @@ static void keyspan_break_ctl(struct tty_struct *tty, int break_state) else p_priv->break_on = 0; + /* FIXME: return errors */ keyspan_send_setup(port, 0); + + return 0; } diff --git a/drivers/usb/serial/keyspan_pda.c b/drivers/usb/serial/keyspan_pda.c index 6fd15cd9e1eb..0eef358b314a 100644 --- a/drivers/usb/serial/keyspan_pda.c +++ b/drivers/usb/serial/keyspan_pda.c @@ -299,7 +299,7 @@ static speed_t keyspan_pda_setbaud(struct usb_serial *serial, speed_t baud) return baud; } -static void keyspan_pda_break_ctl(struct tty_struct *tty, int break_state) +static int keyspan_pda_break_ctl(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; struct usb_serial *serial = port->serial; @@ -315,9 +315,13 @@ static void keyspan_pda_break_ctl(struct tty_struct *tty, int break_state) 4, /* set break */ USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT, value, 0, NULL, 0, 2000); - if (result < 0) + if (result < 0) { dev_dbg(&port->dev, "%s - error %d from usb_control_msg\n", __func__, result); + return result; + } + + return 0; } static void keyspan_pda_set_termios(struct tty_struct *tty, diff --git a/drivers/usb/serial/mct_u232.c b/drivers/usb/serial/mct_u232.c index d3852feb81a4..6570c8817a80 100644 --- a/drivers/usb/serial/mct_u232.c +++ b/drivers/usb/serial/mct_u232.c @@ -47,7 +47,7 @@ static void mct_u232_read_int_callback(struct urb *urb); static void mct_u232_set_termios(struct tty_struct *tty, struct usb_serial_port *port, const struct ktermios *old_termios); -static void mct_u232_break_ctl(struct tty_struct *tty, int break_state); +static int mct_u232_break_ctl(struct tty_struct *tty, int break_state); static int mct_u232_tiocmget(struct tty_struct *tty); static int mct_u232_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear); @@ -677,7 +677,7 @@ static void mct_u232_set_termios(struct tty_struct *tty, spin_unlock_irqrestore(&priv->lock, flags); } /* mct_u232_set_termios */ -static void mct_u232_break_ctl(struct tty_struct *tty, int break_state) +static int mct_u232_break_ctl(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; struct mct_u232_private *priv = usb_get_serial_port_data(port); @@ -691,7 +691,7 @@ static void mct_u232_break_ctl(struct tty_struct *tty, int break_state) lcr |= MCT_U232_SET_BREAK; spin_unlock_irqrestore(&priv->lock, flags); - mct_u232_set_line_ctrl(port, lcr); + return mct_u232_set_line_ctrl(port, lcr); } /* mct_u232_break_ctl */ diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c index 1d1f85fabc28..23544074eb1c 100644 --- a/drivers/usb/serial/mos7720.c +++ b/drivers/usb/serial/mos7720.c @@ -996,7 +996,7 @@ static void mos7720_close(struct usb_serial_port *port) mos7720_port->open = 0; } -static void mos7720_break(struct tty_struct *tty, int break_state) +static int mos7720_break(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; unsigned char data; @@ -1007,7 +1007,7 @@ static void mos7720_break(struct tty_struct *tty, int break_state) mos7720_port = usb_get_serial_port_data(port); if (mos7720_port == NULL) - return; + return -ENODEV; if (break_state == -1) data = mos7720_port->shadowLCR | UART_LCR_SBC; @@ -1015,8 +1015,9 @@ static void mos7720_break(struct tty_struct *tty, int break_state) data = mos7720_port->shadowLCR & ~UART_LCR_SBC; mos7720_port->shadowLCR = data; - write_mos_reg(serial, port->port_number, MOS7720_LCR, - mos7720_port->shadowLCR); + + return write_mos_reg(serial, port->port_number, MOS7720_LCR, + mos7720_port->shadowLCR); } /* diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c index 73370eaae0ab..8b0308d84270 100644 --- a/drivers/usb/serial/mos7840.c +++ b/drivers/usb/serial/mos7840.c @@ -787,7 +787,7 @@ static void mos7840_close(struct usb_serial_port *port) * mos7840_break * this function sends a break to the port *****************************************************************************/ -static void mos7840_break(struct tty_struct *tty, int break_state) +static int mos7840_break(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; struct moschip_port *mos7840_port = usb_get_serial_port_data(port); @@ -801,8 +801,9 @@ static void mos7840_break(struct tty_struct *tty, int break_state) /* FIXME: no locking on shadowLCR anywhere in driver */ mos7840_port->shadowLCR = data; dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR); - mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, - mos7840_port->shadowLCR); + + return mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, + mos7840_port->shadowLCR); } /***************************************************************************** diff --git a/drivers/usb/serial/mxuport.c b/drivers/usb/serial/mxuport.c index faa0eedfe245..1f7bb3e4fcf2 100644 --- a/drivers/usb/serial/mxuport.c +++ b/drivers/usb/serial/mxuport.c @@ -1230,7 +1230,7 @@ static void mxuport_close(struct usb_serial_port *port) } /* Send a break to the port. */ -static void mxuport_break_ctl(struct tty_struct *tty, int break_state) +static int mxuport_break_ctl(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; struct usb_serial *serial = port->serial; @@ -1244,8 +1244,8 @@ static void mxuport_break_ctl(struct tty_struct *tty, int break_state) dev_dbg(&port->dev, "%s - clearing break\n", __func__); } - mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_BREAK, - enable, port->port_number); + return mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_BREAK, + enable, port->port_number); } static int mxuport_resume(struct usb_serial *serial) diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c index 8949c1891164..d93f5d584557 100644 --- a/drivers/usb/serial/pl2303.c +++ b/drivers/usb/serial/pl2303.c @@ -173,7 +173,7 @@ MODULE_DEVICE_TABLE(usb, id_table); #define PL2303_HXN_FLOWCTRL_RTS_CTS 0x18 #define PL2303_HXN_FLOWCTRL_XON_XOFF 0x0c -static void pl2303_set_break(struct usb_serial_port *port, bool enable); +static int pl2303_set_break(struct usb_serial_port *port, bool enable); enum pl2303_type { TYPE_H, @@ -1060,7 +1060,7 @@ static int pl2303_carrier_raised(struct usb_serial_port *port) return 0; } -static void pl2303_set_break(struct usb_serial_port *port, bool enable) +static int pl2303_set_break(struct usb_serial_port *port, bool enable) { struct usb_serial *serial = port->serial; u16 state; @@ -1077,15 +1077,19 @@ static void pl2303_set_break(struct usb_serial_port *port, bool enable) result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), BREAK_REQUEST, BREAK_REQUEST_TYPE, state, 0, NULL, 0, 100); - if (result) + if (result) { dev_err(&port->dev, "error sending break = %d\n", result); + return result; + } + + return 0; } -static void pl2303_break_ctl(struct tty_struct *tty, int state) +static int pl2303_break_ctl(struct tty_struct *tty, int state) { struct usb_serial_port *port = tty->driver_data; - pl2303_set_break(port, state); + return pl2303_set_break(port, state); } static void pl2303_update_line_status(struct usb_serial_port *port, diff --git a/drivers/usb/serial/quatech2.c b/drivers/usb/serial/quatech2.c index fee581409bf6..821f25e52ec2 100644 --- a/drivers/usb/serial/quatech2.c +++ b/drivers/usb/serial/quatech2.c @@ -741,7 +741,7 @@ static int qt2_tiocmset(struct tty_struct *tty, return update_mctrl(port_priv, set, clear); } -static void qt2_break_ctl(struct tty_struct *tty, int break_state) +static int qt2_break_ctl(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; struct qt2_port_private *port_priv; @@ -754,10 +754,14 @@ static void qt2_break_ctl(struct tty_struct *tty, int break_state) status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL, val, port_priv->device_port); - if (status < 0) + if (status < 0) { dev_warn(&port->dev, "%s - failed to send control message: %i\n", __func__, status); + return status; + } + + return 0; } diff --git a/drivers/usb/serial/ti_usb_3410_5052.c b/drivers/usb/serial/ti_usb_3410_5052.c index b99f78224846..0fba25abf671 100644 --- a/drivers/usb/serial/ti_usb_3410_5052.c +++ b/drivers/usb/serial/ti_usb_3410_5052.c @@ -319,7 +319,7 @@ static void ti_set_termios(struct tty_struct *tty, static int ti_tiocmget(struct tty_struct *tty); static int ti_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear); -static void ti_break(struct tty_struct *tty, int break_state); +static int ti_break(struct tty_struct *tty, int break_state); static void ti_interrupt_callback(struct urb *urb); static void ti_bulk_in_callback(struct urb *urb); static void ti_bulk_out_callback(struct urb *urb); @@ -1071,7 +1071,7 @@ static int ti_tiocmset(struct tty_struct *tty, } -static void ti_break(struct tty_struct *tty, int break_state) +static int ti_break(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; struct ti_port *tport = usb_get_serial_port_data(port); @@ -1083,8 +1083,12 @@ static void ti_break(struct tty_struct *tty, int break_state) tport->tp_uart_base_addr + TI_UART_OFFSET_LCR, TI_LCR_BREAK, break_state == -1 ? TI_LCR_BREAK : 0); - if (status) + if (status) { dev_dbg(&port->dev, "%s - error setting break, %d\n", __func__, status); + return status; + } + + return 0; } static int ti_get_port_from_code(unsigned char code) diff --git a/drivers/usb/serial/upd78f0730.c b/drivers/usb/serial/upd78f0730.c index c47439bd90fa..46952182e04f 100644 --- a/drivers/usb/serial/upd78f0730.c +++ b/drivers/usb/serial/upd78f0730.c @@ -238,12 +238,13 @@ static int upd78f0730_tiocmset(struct tty_struct *tty, return res; } -static void upd78f0730_break_ctl(struct tty_struct *tty, int break_state) +static int upd78f0730_break_ctl(struct tty_struct *tty, int break_state) { struct upd78f0730_port_private *private; struct usb_serial_port *port = tty->driver_data; struct upd78f0730_set_dtr_rts request; struct device *dev = &port->dev; + int res; private = usb_get_serial_port_data(port); @@ -258,8 +259,10 @@ static void upd78f0730_break_ctl(struct tty_struct *tty, int break_state) request.opcode = UPD78F0730_CMD_SET_DTR_RTS; request.params = private->line_signals; - upd78f0730_send_ctl(port, &request, sizeof(request)); + res = upd78f0730_send_ctl(port, &request, sizeof(request)); mutex_unlock(&private->lock); + + return res; } static void upd78f0730_dtr_rts(struct usb_serial_port *port, int on) diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index f8404073558b..470634444af7 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -539,7 +539,7 @@ static int serial_break(struct tty_struct *tty, int break_state) dev_dbg(&port->dev, "%s\n", __func__); if (port->serial->type->break_ctl) - port->serial->type->break_ctl(tty, break_state); + return port->serial->type->break_ctl(tty, break_state); return 0; } diff --git a/drivers/usb/serial/usb_debug.c b/drivers/usb/serial/usb_debug.c index aaf4813e4971..6934970f180d 100644 --- a/drivers/usb/serial/usb_debug.c +++ b/drivers/usb/serial/usb_debug.c @@ -47,12 +47,19 @@ MODULE_DEVICE_TABLE(usb, id_table_combined); /* This HW really does not support a serial break, so one will be * emulated when ever the break state is set to true. */ -static void usb_debug_break_ctl(struct tty_struct *tty, int break_state) +static int usb_debug_break_ctl(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; + int ret; + if (!break_state) - return; - usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE); + return 0; + + ret = usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE); + if (ret < 0) + return ret; + + return 0; } static void usb_debug_process_read_urb(struct urb *urb) diff --git a/drivers/usb/serial/whiteheat.c b/drivers/usb/serial/whiteheat.c index 7f82d40753ee..ca48e90a8e81 100644 --- a/drivers/usb/serial/whiteheat.c +++ b/drivers/usb/serial/whiteheat.c @@ -87,7 +87,7 @@ static void whiteheat_set_termios(struct tty_struct *tty, static int whiteheat_tiocmget(struct tty_struct *tty); static int whiteheat_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear); -static void whiteheat_break_ctl(struct tty_struct *tty, int break_state); +static int whiteheat_break_ctl(struct tty_struct *tty, int break_state); static struct usb_serial_driver whiteheat_fake_device = { .driver = { @@ -449,10 +449,11 @@ static void whiteheat_set_termios(struct tty_struct *tty, firm_setup_port(tty); } -static void whiteheat_break_ctl(struct tty_struct *tty, int break_state) +static int whiteheat_break_ctl(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; - firm_set_break(port, break_state); + + return firm_set_break(port, break_state); } diff --git a/drivers/usb/serial/xr_serial.c b/drivers/usb/serial/xr_serial.c index fdb0aae546c3..4ec7c5892b84 100644 --- a/drivers/usb/serial/xr_serial.c +++ b/drivers/usb/serial/xr_serial.c @@ -503,7 +503,7 @@ static void xr_dtr_rts(struct usb_serial_port *port, int on) xr_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS); } -static void xr_break_ctl(struct tty_struct *tty, int break_state) +static int xr_break_ctl(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; struct xr_data *data = usb_get_serial_port_data(port); @@ -517,7 +517,7 @@ static void xr_break_ctl(struct tty_struct *tty, int break_state) dev_dbg(&port->dev, "Turning break %s\n", state == 0 ? "off" : "on"); - xr_set_reg_uart(port, type->tx_break, state); + return xr_set_reg_uart(port, type->tx_break, state); } /* Tx and Rx clock mask values obtained from section 3.3.4 of datasheet */ diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h index 7eeb5f9c4f0d..1a0a4dc87980 100644 --- a/include/linux/usb/serial.h +++ b/include/linux/usb/serial.h @@ -278,7 +278,7 @@ struct usb_serial_driver { int (*set_serial)(struct tty_struct *tty, struct serial_struct *ss); void (*set_termios)(struct tty_struct *tty, struct usb_serial_port *port, const struct ktermios *old); - void (*break_ctl)(struct tty_struct *tty, int break_state); + int (*break_ctl)(struct tty_struct *tty, int break_state); unsigned int (*chars_in_buffer)(struct tty_struct *tty); void (*wait_until_sent)(struct tty_struct *tty, long timeout); bool (*tx_empty)(struct usb_serial_port *port); From patchwork Fri Jun 2 12:46:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 688687 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7EC9FC7EE24 for ; Fri, 2 Jun 2023 12:46:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235465AbjFBMqv (ORCPT ); Fri, 2 Jun 2023 08:46:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46446 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235145AbjFBMqu (ORCPT ); Fri, 2 Jun 2023 08:46:50 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4E7A118C; Fri, 2 Jun 2023 05:46:49 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id DCD706501F; Fri, 2 Jun 2023 12:46:48 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 488E9C433EF; Fri, 2 Jun 2023 12:46:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1685710008; bh=Ja8wGgMtSQRHBWHquX+EUjKNR8wzL800/eoXUfWWbuE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dywXsl6gXdpD7AZoMXIdBbji/kK6yXWUwuYG2uL6Pa9n82LO9p/c2rYcSNTExMAyr KFdnxT1M+Bev4jtmHKGOpNpBDAcNYTesAgIxq6te6wu8gNokgQgci/Yve0XLMxOoIG +G3oL7mSPK5of78lXtBmSJyI1nQv1nS8SGCm+irKwvLD/s2x0QIYsQbYcdNLqSgmJw SNEs+wEA8ABJ4CSoXf+iF0s8hg+xwJw0sJJ4EBAM6rJhODh9eEF0kbHLdDrgiaA57F T/C8UDnGcmc6zFLxr7f7tJ6lHnAYmiDZ9b92Q2pkTe/Rc2g8grBdMJkL7W8uuLA99D WtkVloIS4DTRQ== Received: from johan by xi.lan with local (Exim 4.94.2) (envelope-from ) id 1q54BG-0004y1-3C; Fri, 02 Jun 2023 14:46:58 +0200 From: Johan Hovold To: Johan Hovold Cc: Greg Kroah-Hartman , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Corey Minyard Subject: [PATCH 2/3] USB: serial: cp210x: disable break signalling on CP2105 SCI Date: Fri, 2 Jun 2023 14:46:41 +0200 Message-Id: <20230602124642.19076-3-johan@kernel.org> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20230602124642.19076-1-johan@kernel.org> References: <20230602124642.19076-1-johan@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Only the first UART interface (ECI) on CP2105 supports break signalling. Return an error on requests for break state changes for the second interface (SCI) to avoid transmitting a garbage character and waiting when break is not supported. Signed-off-by: Johan Hovold --- drivers/usb/serial/cp210x.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c index 81e49ed9d147..1e61fe043171 100644 --- a/drivers/usb/serial/cp210x.c +++ b/drivers/usb/serial/cp210x.c @@ -1437,8 +1437,14 @@ static int cp210x_tiocmget(struct tty_struct *tty) static int cp210x_break_ctl(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; + struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); u16 state; + if (priv->partnum == CP210X_PARTNUM_CP2105) { + if (cp210x_interface_num(port->serial) == 1) + return -ENOTTY; + } + if (break_state == 0) state = BREAK_OFF; else From patchwork Fri Jun 2 12:46:42 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 688993 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D6C18C77B7A for ; Fri, 2 Jun 2023 12:46:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235665AbjFBMqw (ORCPT ); Fri, 2 Jun 2023 08:46:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46444 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235286AbjFBMqu (ORCPT ); Fri, 2 Jun 2023 08:46:50 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4A0E913D; Fri, 2 Jun 2023 05:46:49 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id D2B5D6500B; Fri, 2 Jun 2023 12:46:48 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 42902C433D2; Fri, 2 Jun 2023 12:46:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1685710008; bh=uSiepLtWjVhXcCAJfRm0oQIqf205bq5k7/+2TYyI62A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=X//v7whp/oQm0/fBEgfGL161IJQ64IbHiJZwCgjVBOwKKkKBtiGEF1VMFICCG5k8A GvitP1GR6to67KLwcXVFtno3OGIP8QGK8gZFgk7CoCZm2vmydovba0aXzVn0UnmvnB d8wTGmSc00WeWPUBw1/gdCiqxjx+ksAG1DI/o188F03GnK/9aTtjLdhxqPaBLIUV0B Cx6H+4VYDNwYivPa2JKfIlU+9mdEq2lf4FHwoUSLpc3AgeNcq2SMUYUAyLv919PpzK H7w1NV8IdzG1WmNhGKKlf6tJZ6r74gWQTi88vD2kMm3d8f5U1H/UuCTvHD6P9TfmKg HdfTme31HEG6w== Received: from johan by xi.lan with local (Exim 4.94.2) (envelope-from ) id 1q54BG-0004y3-5j; Fri, 02 Jun 2023 14:46:58 +0200 From: Johan Hovold To: Johan Hovold Cc: Greg Kroah-Hartman , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Corey Minyard Subject: [PATCH 3/3] USB: serial: report unsupported break signalling Date: Fri, 2 Jun 2023 14:46:42 +0200 Message-Id: <20230602124642.19076-4-johan@kernel.org> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20230602124642.19076-1-johan@kernel.org> References: <20230602124642.19076-1-johan@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Instead of returning success when a driver does not support break signalling, return an error to let user space know and to avoid waiting when break is not supported. Signed-off-by: Johan Hovold --- drivers/usb/serial/usb-serial.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index 470634444af7..7b4805c1004d 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -541,7 +541,7 @@ static int serial_break(struct tty_struct *tty, int break_state) if (port->serial->type->break_ctl) return port->serial->type->break_ctl(tty, break_state); - return 0; + return -ENOTTY; } static int serial_proc_show(struct seq_file *m, void *v)