Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754262AbbGXGtY (ORCPT ); Fri, 24 Jul 2015 02:49:24 -0400 Received: from smtp2.provo.novell.com ([137.65.250.81]:42368 "EHLO smtp2.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754222AbbGXGtV (ORCPT ); Fri, 24 Jul 2015 02:49:21 -0400 From: Petr Tesarik To: Johan Hovold , Greg Kroah-Hartman Cc: Petr Tesarik , linux-usb@vger.kernel.org (open list:USB SERIAL SUBSYSTEM), linux-kernel@vger.kernel.org (open list), Petr Tesarik Subject: [PATCH 4/4] cp210x: Expose the part number in sysfs Date: Fri, 24 Jul 2015 08:48:11 +0200 Message-Id: <1437720491-28702-5-git-send-email-ptesarik@suse.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1437720491-28702-1-git-send-email-ptesarik@suse.com> References: <1437720491-28702-1-git-send-email-ptesarik@suse.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2031 Lines: 68 From: Petr Tesarik Make it possible to read the cp210x part number from userspace by making it a sysfs attribute. Signed-off-by: Petr Tesarik --- drivers/usb/serial/cp210x.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c index dbfc722..66de350 100644 --- a/drivers/usb/serial/cp210x.c +++ b/drivers/usb/serial/cp210x.c @@ -871,11 +871,24 @@ static void cp210x_break_ctl(struct tty_struct *tty, int break_state) cp210x_set_config(port, CP210X_SET_BREAK, &state, 2); } +static ssize_t part_number_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct usb_interface *intf = to_usb_interface(dev); + struct usb_serial *serial = usb_get_intfdata(intf); + struct cp210x_serial_private *spriv = usb_get_serial_data(serial); + + return sprintf(buf, "%i\n", spriv->bPartNumber); +} + +static DEVICE_ATTR_RO(part_number); + static int cp210x_startup(struct usb_serial *serial) { struct usb_host_interface *cur_altsetting; struct cp210x_serial_private *spriv; unsigned int partnum; + int result; spriv = kzalloc(sizeof(*spriv), GFP_KERNEL); if (!spriv) @@ -892,13 +905,19 @@ static int cp210x_startup(struct usb_serial *serial) &partnum, 1, USB_CTRL_GET_TIMEOUT); spriv->bPartNumber = partnum & 0xFF; - return 0; + result = device_create_file(&serial->interface->dev, + &dev_attr_part_number); + if (result) + kfree(spriv); + + return result; } static void cp210x_release(struct usb_serial *serial) { struct cp210x_serial_private *spriv; + device_remove_file(&serial->interface->dev, &dev_attr_part_number); spriv = usb_get_serial_data(serial); kfree(spriv); } -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/