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Date: Mon, 16 Feb 2015 15:57:54 +0800
From: Peter Hung <hpeter@...il.com>
To: johan@...nel.org
Cc: gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
linux-kernel@...r.kernel.org, tom_tsai@...tek.com.tw,
peter_hong@...tek.com.tw,
Peter Hung <hpeter+linux_kernel@...il.com>
Subject: [PATCH V6 02/10] USB: f81232: implement read IIR/MSR with endpoint
The interrupt Endpoint will report current IIR. If we got IIR with MSR Changed
, We will do read MSR with interrupt_work worker to do f81232_read_msr() func.
Signed-off-by: Peter Hung <hpeter+linux_kernel@...il.com>
---
drivers/usb/serial/f81232.c | 109 ++++++++++++++++++++++++++++++++++++++++----
1 file changed, 100 insertions(+), 9 deletions(-)
diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
index 669a2f2..ec4609d 100644
--- a/drivers/usb/serial/f81232.c
+++ b/drivers/usb/serial/f81232.c
@@ -23,6 +23,7 @@
#include <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
+#include <linux/serial_reg.h>
static const struct usb_device_id id_table[] = {
{ USB_DEVICE(0x1934, 0x0706) },
@@ -30,6 +31,13 @@ static const struct usb_device_id id_table[] = {
};
MODULE_DEVICE_TABLE(usb, id_table);
+/* USB Control EP parameter */
+#define F81232_REGISTER_REQUEST 0xA0
+#define F81232_GET_REGISTER 0xc0
+
+#define SERIAL_BASE_ADDRESS 0x0120
+#define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS)
+
#define CONTROL_DTR 0x01
#define CONTROL_RTS 0x02
@@ -48,19 +56,92 @@ struct f81232_private {
spinlock_t lock;
u8 line_control;
u8 modem_status;
+
+ struct work_struct interrupt_work;
+ struct usb_serial_port *port;
};
-static void f81232_update_line_status(struct usb_serial_port *port,
+static int f81232_get_register(struct usb_serial_port *port,
+ u16 reg, u8 *data)
+{
+ int status;
+ struct usb_device *dev = port->serial->dev;
+
+ status = usb_control_msg(dev,
+ usb_rcvctrlpipe(dev, 0),
+ F81232_REGISTER_REQUEST,
+ F81232_GET_REGISTER,
+ reg,
+ 0,
+ data,
+ sizeof(*data),
+ USB_CTRL_GET_TIMEOUT);
+ if (status < 0)
+ dev_err(&port->dev, "%s status: %d\n", __func__, status);
+
+ return status;
+}
+
+static void f81232_read_msr(struct usb_serial_port *port)
+{
+ int status;
+ unsigned long flags;
+ u8 current_msr;
+ struct tty_struct *tty;
+ struct f81232_private *priv = usb_get_serial_port_data(port);
+
+ status = f81232_get_register(port, MODEM_STATUS_REGISTER,
+ ¤t_msr);
+ if (status < 0) {
+ /* Retain the error even reported in f81232_get_register()
+ to make debug easily :D */
+ dev_err(&port->dev, "%s fail, status: %d\n", __func__, status);
+ return;
+ }
+
+ if (!(current_msr & UART_MSR_ANY_DELTA))
+ return;
+
+ tty = tty_port_tty_get(&port->port);
+ if (tty) {
+ if (current_msr & UART_MSR_DDCD) {
+ usb_serial_handle_dcd_change(port, tty,
+ current_msr & UART_MSR_DCD);
+ }
+
+ tty_kref_put(tty);
+ }
+
+ spin_lock_irqsave(&priv->lock, flags);
+ priv->modem_status = current_msr;
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ wake_up_interruptible(&port->port.delta_msr_wait);
+}
+
+static void f81232_update_modem_status(struct usb_serial_port *port,
unsigned char *data,
unsigned int actual_length)
{
- /*
- * FIXME: Update port->icount, and call
- *
- * wake_up_interruptible(&port->port.delta_msr_wait);
- *
- * on MSR changes.
- */
+ struct f81232_private *priv = usb_get_serial_port_data(port);
+
+ if (!actual_length)
+ return;
+
+ switch (data[0] & 0x07) {
+ case 0x00: /* msr change */
+ dev_dbg(&port->dev, "IIR: MSR Change: %x\n", data[0]);
+ schedule_work(&priv->interrupt_work);
+ break;
+ case 0x02: /* tx-empty */
+ break;
+ case 0x04: /* rx data available */
+ break;
+ case 0x06: /* lsr change */
+ /* we can forget it. the LSR will read from bulk-in */
+ dev_dbg(&port->dev, "IIR: LSR Change: %x\n", data[0]);
+ break;
+ }
}
static void f81232_read_int_callback(struct urb *urb)
@@ -91,7 +172,7 @@ static void f81232_read_int_callback(struct urb *urb)
usb_serial_debug_data(&port->dev, __func__,
urb->actual_length, urb->transfer_buffer);
- f81232_update_line_status(port, data, actual_length);
+ f81232_update_modem_status(port, data, actual_length);
exit:
retval = usb_submit_urb(urb, GFP_ATOMIC);
@@ -270,6 +351,14 @@ static int f81232_ioctl(struct tty_struct *tty,
return -ENOIOCTLCMD;
}
+static void f81232_interrupt_work(struct work_struct *work)
+{
+ struct f81232_private *priv =
+ container_of(work, struct f81232_private, interrupt_work);
+
+ f81232_read_msr(priv->port);
+}
+
static int f81232_port_probe(struct usb_serial_port *port)
{
struct f81232_private *priv;
@@ -279,10 +368,12 @@ static int f81232_port_probe(struct usb_serial_port *port)
return -ENOMEM;
spin_lock_init(&priv->lock);
+ INIT_WORK(&priv->interrupt_work, f81232_interrupt_work);
usb_set_serial_port_data(port, priv);
port->port.drain_delay = 256;
+ priv->port = port;
return 0;
}
--
1.9.1
--
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