diff options
| -rw-r--r-- | drivers/usb/serial/iuu_phoenix.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/drivers/usb/serial/iuu_phoenix.c b/drivers/usb/serial/iuu_phoenix.c index 60a7d8dc075..5f133429cd4 100644 --- a/drivers/usb/serial/iuu_phoenix.c +++ b/drivers/usb/serial/iuu_phoenix.c @@ -79,6 +79,7 @@ struct iuu_private { u8 *buf; /* used for initialize speed */ u8 *dbgbuf; /* debug buffer */ u8 len; + int vcc; /* vcc (either 3 or 5 V) */ }; @@ -114,6 +115,7 @@ static int iuu_startup(struct usb_serial *serial) kfree(priv); return -ENOMEM; } + priv->vcc = 5; /* 5 V for vcc by default */ spin_lock_init(&priv->lock); init_waitqueue_head(&priv->delta_msr_wait); usb_set_serial_port_data(serial->port[0], priv); @@ -1178,6 +1180,95 @@ static int iuu_open(struct tty_struct *tty, struct usb_serial_port *port) return result; } +/* how to change VCC */ +static int iuu_vcc_set(struct usb_serial_port *port, unsigned int vcc) +{ + int status; + u8 *buf; + + buf = kmalloc(5, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + dbg("%s - enter", __func__); + + buf[0] = IUU_SET_VCC; + buf[1] = vcc & 0xFF; + buf[2] = (vcc >> 8) & 0xFF; + buf[3] = (vcc >> 16) & 0xFF; + buf[4] = (vcc >> 24) & 0xFF; + + status = bulk_immediate(port, buf, 5); + kfree(buf); + + if (status != IUU_OPERATION_OK) + dbg("%s - vcc error status = %2x", __func__, status); + else + dbg("%s - vcc OK !", __func__); + + return status; +} + +/* + * Sysfs Attributes + */ + +static ssize_t show_vcc_mode(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct usb_serial_port *port = to_usb_serial_port(dev); + struct iuu_private *priv = usb_get_serial_port_data(port); + + return sprintf(buf, "%d\n", priv->vcc); +} + +static ssize_t store_vcc_mode(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct usb_serial_port *port = to_usb_serial_port(dev); + struct iuu_private *priv = usb_get_serial_port_data(port); + unsigned long v; + + if (strict_strtoul(buf, 10, &v)) { + dev_err(dev, "%s - vcc_mode: %s is not a unsigned long\n", + __func__, buf); + goto fail_store_vcc_mode; + } + + dbg("%s: setting vcc_mode = %ld", __func__, v); + + if ((v != 3) && (v != 5)) { + dev_err(dev, "%s - vcc_mode %ld is invalid\n", __func__, v); + } else { + iuu_vcc_set(port, v); + priv->vcc = v; + } +fail_store_vcc_mode: + return count; +} + +static DEVICE_ATTR(vcc_mode, S_IRUSR | S_IWUSR, show_vcc_mode, + store_vcc_mode); + +static int iuu_create_sysfs_attrs(struct usb_serial_port *port) +{ + dbg("%s", __func__); + + return device_create_file(&port->dev, &dev_attr_vcc_mode); +} + +static int iuu_remove_sysfs_attrs(struct usb_serial_port *port) +{ + dbg("%s", __func__); + + device_remove_file(&port->dev, &dev_attr_vcc_mode); + return 0; +} + +/* + * End Sysfs Attributes + */ + static struct usb_serial_driver iuu_device = { .driver = { .owner = THIS_MODULE, @@ -1185,6 +1276,8 @@ static struct usb_serial_driver iuu_device = { }, .id_table = id_table, .num_ports = 1, + .port_probe = iuu_create_sysfs_attrs, + .port_remove = iuu_remove_sysfs_attrs, .open = iuu_open, .close = iuu_close, .write = iuu_uart_write, |