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USB: f81232: implement read IIR/MSR with endpoint

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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()
function.

Signed-off-by: Peter Hung <hpeter+linux_kernel@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Peter Hung 2015-03-17 17:48:22 +08:00 committed by Johan Hovold
parent 7139c93285
commit 87fe5adcd8
1 changed files with 118 additions and 8 deletions
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126
drivers/usb/serial/f81232.c
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@ -31,6 +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
@ -49,19 +56,112 @@ struct f81232_private {
struct mutex lock;
u8 line_control;
u8 modem_status;
struct work_struct interrupt_work;
struct usb_serial_port *port;
};
static int f81232_get_register(struct usb_serial_port *port, u16 reg, u8 *val)
{
int status;
u8 *tmp;
struct usb_device *dev = port->serial->dev;
tmp = kmalloc(sizeof(*val), GFP_KERNEL);
if (!tmp)
return -ENOMEM;
status = usb_control_msg(dev,
usb_rcvctrlpipe(dev, 0),
F81232_REGISTER_REQUEST,
F81232_GET_REGISTER,
reg,
0,
tmp,
sizeof(*val),
USB_CTRL_GET_TIMEOUT);
if (status != sizeof(*val)) {
dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
if (status < 0)
status = usb_translate_errors(status);
else
status = -EIO;
} else {
status = 0;
*val = *tmp;
}
kfree(tmp);
return status;
}
static void f81232_read_msr(struct usb_serial_port *port)
{
int status;
u8 current_msr;
struct tty_struct *tty;
struct f81232_private *priv = usb_get_serial_port_data(port);
mutex_lock(&priv->lock);
status = f81232_get_register(port, MODEM_STATUS_REGISTER,
&current_msr);
if (status) {
dev_err(&port->dev, "%s fail, status: %d\n", __func__, status);
mutex_unlock(&priv->lock);
return;
}
if (!(current_msr & UART_MSR_ANY_DELTA)) {
mutex_unlock(&priv->lock);
return;
}
priv->modem_status = current_msr;
if (current_msr & UART_MSR_DCTS)
port->icount.cts++;
if (current_msr & UART_MSR_DDSR)
port->icount.dsr++;
if (current_msr & UART_MSR_TERI)
port->icount.rng++;
if (current_msr & UART_MSR_DDCD) {
port->icount.dcd++;
tty = tty_port_tty_get(&port->port);
if (tty) {
usb_serial_handle_dcd_change(port, tty,
current_msr & UART_MSR_DCD);
tty_kref_put(tty);
}
}
wake_up_interruptible(&port->port.delta_msr_wait);
mutex_unlock(&priv->lock);
}
static void f81232_update_line_status(struct usb_serial_port *port,
unsigned char *data,
unsigned int actual_length)
size_t 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: %02x\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: %02x\n", data[0]);
break;
}
}
static void f81232_read_int_callback(struct urb *urb)
@ -276,6 +376,14 @@ 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;
@ -285,10 +393,12 @@ static int f81232_port_probe(struct usb_serial_port *port)
return -ENOMEM;
mutex_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;
}