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USB: serial: ftdi_sio: convert to use dev_groups

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The driver core supports the ability to handle the creation and removal
of device-specific sysfs files in a race-free manner.

Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
[ johan: rebase on type rework, make groups static, clean up, amend
         commit message ]
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Jiasheng Jiang 2022-09-14 15:13:34 +08:00 committed by Johan Hovold
parent cfebcd53e6
commit 0f6632e2e8
1 changed files with 28 additions and 21 deletions
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49
drivers/usb/serial/ftdi_sio.c
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@ -1140,10 +1140,13 @@ 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 const struct attribute_group *ftdi_groups[];
static struct usb_serial_driver ftdi_sio_device = {
.driver = {
.owner = THIS_MODULE,
.name = "ftdi_sio",
.dev_groups = ftdi_groups,
},
.description = "FTDI USB Serial Device",
.id_table = id_table_combined,
@ -1760,35 +1763,42 @@ static ssize_t event_char_store(struct device *dev,
}
static DEVICE_ATTR_WO(event_char);
static int create_sysfs_attrs(struct usb_serial_port *port)
static struct attribute *ftdi_attrs[] = {
&dev_attr_event_char.attr,
&dev_attr_latency_timer.attr,
NULL
};
static umode_t ftdi_is_visible(struct kobject *kobj, struct attribute *attr, int idx)
{
struct device *dev = kobj_to_dev(kobj);
struct usb_serial_port *port = to_usb_serial_port(dev);
struct ftdi_private *priv = usb_get_serial_port_data(port);
enum ftdi_chip_type type = priv->chip_type;
int ret = 0;
umode_t mode = attr->mode;
if (type != SIO) {
ret = device_create_file(&port->dev, &dev_attr_event_char);
if (ret)
return ret;
if (attr == &dev_attr_event_char.attr)
return mode;
}
if (type != SIO && type != FT232A)
ret = device_create_file(&port->dev, &dev_attr_latency_timer);
if (type != SIO && type != FT232A) {
if (attr == &dev_attr_latency_timer.attr)
return mode;
}
return ret;
return 0;
}
static void remove_sysfs_attrs(struct usb_serial_port *port)
{
struct ftdi_private *priv = usb_get_serial_port_data(port);
enum ftdi_chip_type type = priv->chip_type;
static const struct attribute_group ftdi_group = {
.attrs = ftdi_attrs,
.is_visible = ftdi_is_visible,
};
if (type != SIO)
device_remove_file(&port->dev, &dev_attr_event_char);
if (type != SIO && type != FT232A)
device_remove_file(&port->dev, &dev_attr_latency_timer);
}
static const struct attribute_group *ftdi_groups[] = {
&ftdi_group,
NULL
};
#ifdef CONFIG_GPIOLIB
@ -2270,7 +2280,6 @@ 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) {
@ -2401,8 +2410,6 @@ static void ftdi_sio_port_remove(struct usb_serial_port *port)
ftdi_gpio_remove(port);
remove_sysfs_attrs(port);
kfree(priv);
}