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[59.120.186.245]) by smtp.gmail.com with ESMTPSA id n21sm294331pff.92.2019.06.05.19.54.45 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 05 Jun 2019 19:54:46 -0700 (PDT) From: "Ji-Ze Hong (Peter Hong)" X-Google-Original-From: "Ji-Ze Hong (Peter Hong)" To: johan@kernel.org Cc: gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, peter_hong@fintek.com.tw, "Ji-Ze Hong (Peter Hong)" Subject: [PATCH V1 4/6] USB: serial: f81232: Add tx_empty function Date: Thu, 6 Jun 2019 10:54:14 +0800 Message-Id: <1559789656-15847-5-git-send-email-hpeter+linux_kernel@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1559789656-15847-1-git-send-email-hpeter+linux_kernel@gmail.com> References: <1559789656-15847-1-git-send-email-hpeter+linux_kernel@gmail.com> Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Add tx_empty() function for F81232 & F81534A series. Signed-off-by: Ji-Ze Hong (Peter Hong) --- drivers/usb/serial/f81232.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c index e9470fb0d691..7d1ec8f9d168 100644 --- a/drivers/usb/serial/f81232.c +++ b/drivers/usb/serial/f81232.c @@ -850,6 +850,24 @@ static void f81232_dtr_rts(struct usb_serial_port *port, int on) f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS); } +static bool f81232_tx_empty(struct usb_serial_port *port) +{ + int status; + u8 tmp; + u8 both_empty = UART_LSR_TEMT | UART_LSR_THRE; + + status = f81232_get_register(port, LINE_STATUS_REGISTER, &tmp); + if (status) { + dev_err(&port->dev, "get LSR status failed: %d\n", status); + return false; + } + + if ((tmp & both_empty) != both_empty) + return false; + + return true; +} + static int f81232_carrier_raised(struct usb_serial_port *port) { u8 msr; @@ -1279,6 +1297,7 @@ static struct usb_serial_driver f81232_device = { .tiocmget = f81232_tiocmget, .tiocmset = f81232_tiocmset, .tiocmiwait = usb_serial_generic_tiocmiwait, + .tx_empty = f81232_tx_empty, .process_read_urb = f81232_read_urb_proxy, .read_int_callback = f81232_read_int_callback, .port_probe = f81232_port_probe, -- 2.7.4