From: Olivier Bornet <Olivier.Bornet@xxxxxxx>
You can now set the IUU reader to 3.3V VCC instead of 5V VCC, using the sysfs
parameter vcc_mode. Valid values are 3 and 5.
Signed-off-by: Olivier Bornet <Olivier.Bornet@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
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 60a7d8d..5f13342 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,
--
1.6.4.2
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