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Subject[PATCH v4 3/7] usb: serial: implement read IIR/MSR ep for F81232
Date
The F81232 interrupt ep will continuously report IIR register value.
We had implement the interrupt callback to read IIR, If noticed with
MSR change, we will call worker to read MSR later.

Signed-off-by: Peter Hung <hpeter+linux_kernel@gmail.com>
---
drivers/usb/serial/f81232.c | 114 +++++++++++++++++++++++++++++++++++++++++---
1 file changed, 107 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
index 9ef9775..274120d 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) },
@@ -44,23 +45,112 @@ MODULE_DEVICE_TABLE(usb, id_table);
#define UART_OVERRUN_ERROR 0x40
#define UART_CTS 0x80

+#define REGISTER_REQUEST 0xA0
+#define GET_REGISTER 0xc0
+#define SET_REGISTER 0x40
+#define F81232_USB_TIMEOUT 3000
+
+#define SERIAL_BASE_ADDRESS (0x0120)
+#define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS)
struct f81232_private {
spinlock_t lock;
u8 line_control;
u8 line_status;
+
+ struct work_struct int_worker;
+ struct usb_serial_port *port;
};

+static inline int f81232_get_register(struct usb_device *dev,
+ u16 reg, u8 *data)
+{
+ int status;
+
+ status = usb_control_msg(dev,
+ usb_rcvctrlpipe(dev, 0),
+ REGISTER_REQUEST,
+ GET_REGISTER,
+ reg,
+ 0,
+ data,
+ sizeof(*data),
+ F81232_USB_TIMEOUT);
+
+ if (status < 0) {
+ dev_dbg(&dev->dev,
+ "%s status: %d\n", __func__, status);
+ }
+
+ return status;
+}
+
+static void f81232_read_msr(struct f81232_private *priv)
+{
+ int status;
+ unsigned long flags;
+ u8 current_msr, old_msr;
+ struct usb_device *dev = priv->port->serial->dev;
+ struct tty_struct *tty;
+
+ status = f81232_get_register(dev, MODEM_STATUS_REGISTER, &current_msr);
+
+ if (status < 0) {
+ dev_dbg(&dev->dev, "%s fail, status: %d\n", __func__, status);
+ return;
+ }
+
+ spin_lock_irqsave(&priv->lock, flags);
+ old_msr = priv->line_status;
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ if (current_msr & UART_MSR_ANY_DELTA) {
+ tty = tty_port_tty_get(&priv->port->port);
+
+ if (tty) {
+ if (current_msr & UART_MSR_DDCD) {
+ usb_serial_handle_dcd_change(priv->port,
+ tty, current_msr & UART_MSR_DCD);
+ }
+
+ tty_kref_put(tty);
+ }
+
+ spin_lock_irqsave(&priv->lock, flags);
+ priv->line_status = current_msr;
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ wake_up_interruptible(&priv->port->port.delta_msr_wait);
+ }
+
+ dev_dbg(&dev->dev, "%s: %x\n", __func__, priv->line_status);
+}
static void f81232_update_line_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);
+ struct usb_device *dev = port->serial->dev;
+
+ if (!actual_length)
+ return;
+
+ switch (data[0] & 0x07) {
+ case 0x00: /* msr change */
+ dev_dbg(&dev->dev, "IIR: MSR Change: %x\n", data[0]);
+ schedule_work(&priv->int_worker);
+ 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(&dev->dev, "IIR: LSR Change: %x\n", data[0]);
+ break;
+ }
}

static void f81232_read_int_callback(struct urb *urb)
@@ -270,6 +360,14 @@ static int f81232_ioctl(struct tty_struct *tty,
return -ENOIOCTLCMD;
}

+static void f81232_int_work_wq(struct work_struct *work)
+{
+ struct f81232_private *priv =
+ container_of(work, struct f81232_private, int_worker);
+
+ f81232_read_msr(priv);
+}
+
static int f81232_port_probe(struct usb_serial_port *port)
{
struct f81232_private *priv;
@@ -279,10 +377,12 @@ static int f81232_port_probe(struct usb_serial_port *port)
return -ENOMEM;

spin_lock_init(&priv->lock);
+ INIT_WORK(&priv->int_worker, f81232_int_work_wq);

usb_set_serial_port_data(port, priv);

port->port.drain_delay = 256;
+ priv->port = port;

return 0;
}
--
1.9.1


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