From patchwork Fri Sep 2 09:44:23 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiasheng Jiang X-Patchwork-Id: 12963980 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 20EAFC38145 for ; Fri, 2 Sep 2022 09:44:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235332AbiIBJoc (ORCPT ); Fri, 2 Sep 2022 05:44:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43232 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235295AbiIBJob (ORCPT ); Fri, 2 Sep 2022 05:44:31 -0400 Received: from cstnet.cn (smtp21.cstnet.cn [159.226.251.21]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 1AC5ACE313; Fri, 2 Sep 2022 02:44:28 -0700 (PDT) Received: from localhost.localdomain (unknown [124.16.138.126]) by APP-01 (Coremail) with SMTP id qwCowAD3_8d40BFjmVGMAA--.46700S2; Fri, 02 Sep 2022 17:44:24 +0800 (CST) From: Jiasheng Jiang To: gregkh@linuxfoundation.org Cc: johan@kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Jiasheng Jiang Subject: [PATCH v3] USB: serial: ftdi_sio: Convert to use dev_groups Date: Fri, 2 Sep 2022 17:44:23 +0800 Message-Id: <20220902094423.4028673-1-jiasheng@iscas.ac.cn> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-CM-TRANSID: qwCowAD3_8d40BFjmVGMAA--.46700S2 X-Coremail-Antispam: 1UD129KBjvJXoW3GrWkXw1xXw1rCw15Zr17trb_yoW7Ar1DpF WUXFWSyFWUJF4agrsYkw4DWw15Cw4kKrZxK3yUGw4SkF1xA34IqFyIyas0vr13JFykKFya qrs3tryDCr4xJr7anT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUkv14x267AKxVWUJVW8JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26r4j6ryUM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26r4j 6F4UM28EF7xvwVC2z280aVAFwI0_Cr1j6rxdM28EF7xvwVC2z280aVCY1x0267AKxVW0oV Cq3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0 I7IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Gr0_Cr1lOx8S6xCaFVCjc4AY6r1j6r 4UM4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwCY02Avz4vE14v_GFWl 42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJV WUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r126r1DMIIYrxkI7VAK I48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r1j6r 4UMIIF0xvE42xK8VAvwI8IcIk0rVWrZr1j6s0DMIIF0xvEx4A2jsIE14v26r4j6F4UMIIF 0xvEx4A2jsIEc7CjxVAFwI0_Gr0_Gr1UYxBIdaVFxhVjvjDU0xZFpf9x0JUOo7ZUUUUU= X-Originating-IP: [124.16.138.126] X-CM-SenderInfo: pmld2xxhqjqxpvfd2hldfou0/ Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org The driver core supports the ability to handle the creation and removal of device-specific sysfs files in a race-free manner. Moreover, it can guarantee the success of creation. Therefore, it should be better to convert to use dev_groups. Signed-off-by: Jiasheng Jiang --- Changelog: v2 -> v3: 1. Add is_visible to filter the unneeded files. v1 -> v2: 1. Change the title. 2. Switch to use an attribute group. --- drivers/usb/serial/ftdi_sio.c | 101 +++++++++++++++++----------------- 1 file changed, 51 insertions(+), 50 deletions(-) diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c index d5a3986dfee7..479c3a5caaf8 100644 --- a/drivers/usb/serial/ftdi_sio.c +++ b/drivers/usb/serial/ftdi_sio.c @@ -1107,11 +1107,40 @@ static u32 ftdi_232bm_baud_base_to_divisor(int baud, int base); static u32 ftdi_232bm_baud_to_divisor(int baud); static u32 ftdi_2232h_baud_base_to_divisor(int baud, int base); static u32 ftdi_2232h_baud_to_divisor(int baud); +static umode_t ftdi_sio_attr_is_visible(struct kobject *kobj, + struct attribute *attr, int idx); +static ssize_t latency_timer_store(struct device *dev, + struct device_attribute *attr, + const char *valbuf, size_t count); +static ssize_t event_char_store(struct device *dev, + struct device_attribute *attr, const char *valbuf, size_t count); +static ssize_t latency_timer_show(struct device *dev, + struct device_attribute *attr, char *buf); + +static DEVICE_ATTR_RW(latency_timer); +static DEVICE_ATTR_WO(event_char); + +static struct attribute *ftdi_sio_attrs[] = { + &dev_attr_event_char.attr, + &dev_attr_latency_timer.attr, + NULL, +}; + +static const struct attribute_group ftdi_sio_group = { + .attrs = ftdi_sio_attrs, + .is_visible = ftdi_sio_attr_is_visible, +}; + +static const struct attribute_group *ftdi_sio_groups[] = { + &ftdi_sio_group, + NULL +}; static struct usb_serial_driver ftdi_sio_device = { .driver = { .owner = THIS_MODULE, .name = "ftdi_sio", + .dev_groups = ftdi_sio_groups, }, .description = "FTDI USB Serial Device", .id_table = id_table_combined, @@ -1696,7 +1725,6 @@ static ssize_t latency_timer_store(struct device *dev, return -EIO; return count; } -static DEVICE_ATTR_RW(latency_timer); /* Write an event character directly to the FTDI register. The ASCII value is in the low 8 bits, with the enable bit in the 9th bit. */ @@ -1727,52 +1755,6 @@ static ssize_t event_char_store(struct device *dev, return count; } -static DEVICE_ATTR_WO(event_char); - -static int create_sysfs_attrs(struct usb_serial_port *port) -{ - struct ftdi_private *priv = usb_get_serial_port_data(port); - int retval = 0; - - /* XXX I've no idea if the original SIO supports the event_char - * sysfs parameter, so I'm playing it safe. */ - if (priv->chip_type != SIO) { - dev_dbg(&port->dev, "sysfs attributes for %s\n", ftdi_chip_name[priv->chip_type]); - retval = device_create_file(&port->dev, &dev_attr_event_char); - if ((!retval) && - (priv->chip_type == FT232BM || - priv->chip_type == FT2232C || - priv->chip_type == FT232RL || - priv->chip_type == FT2232H || - priv->chip_type == FT4232H || - priv->chip_type == FT232H || - priv->chip_type == FTX)) { - retval = device_create_file(&port->dev, - &dev_attr_latency_timer); - } - } - return retval; -} - -static void remove_sysfs_attrs(struct usb_serial_port *port) -{ - struct ftdi_private *priv = usb_get_serial_port_data(port); - - /* XXX see create_sysfs_attrs */ - if (priv->chip_type != SIO) { - device_remove_file(&port->dev, &dev_attr_event_char); - if (priv->chip_type == FT232BM || - priv->chip_type == FT2232C || - priv->chip_type == FT232RL || - priv->chip_type == FT2232H || - priv->chip_type == FT4232H || - priv->chip_type == FT232H || - priv->chip_type == FTX) { - device_remove_file(&port->dev, &dev_attr_latency_timer); - } - } - -} #ifdef CONFIG_GPIOLIB @@ -2251,7 +2233,6 @@ static int ftdi_sio_port_probe(struct usb_serial_port *port) if (read_latency_timer(port) < 0) priv->latency = 16; write_latency_timer(port); - create_sysfs_attrs(port); result = ftdi_gpio_init(port); if (result < 0) { @@ -2377,8 +2358,6 @@ static void ftdi_sio_port_remove(struct usb_serial_port *port) ftdi_gpio_remove(port); - remove_sysfs_attrs(port); - kfree(priv); } @@ -2915,6 +2894,28 @@ static int ftdi_ioctl(struct tty_struct *tty, return -ENOIOCTLCMD; } +static umode_t ftdi_sio_attr_is_visible(struct kobject *kobj, + struct attribute *attr, int idx) +{ + struct device *dev = kobj_to_dev(kobj); + struct usb_serial_port *port = container_of(dev, struct usb_serial_port, dev); + struct ftdi_private *priv = usb_get_serial_port_data(port); + umode_t mode = attr->mode; + + if (attr == &dev_attr_latency_timer.attr) { + if (priv->chip_type == FT232BM || + priv->chip_type == FT2232C || + priv->chip_type == FT232RL || + priv->chip_type == FT2232H || + priv->chip_type == FT4232H || + priv->chip_type == FT232H || + priv->chip_type == FTX) { + return mode; + } + } + return 0; +} + module_usb_serial_driver(serial_drivers, id_table_combined); MODULE_AUTHOR(DRIVER_AUTHOR);