Commit 093ea2d3 authored by Donald Lee's avatar Donald Lee Committed by Greg Kroah-Hartman
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USB: serial: mos7840: Fixed MCS7820 device attach problem 



A MCS7820 device supports two serial ports and a MCS7840 device supports
four serial ports. Both devices use the same driver, but the attach function
in driver was unable to correctly handle the port numbers for MCS7820
device. This problem has been fixed in this patch and this fix has been
verified on x86 Linux kernel 3.2.9 with both MCS7820 and MCS7840 devices.

Signed-off-by: default avatarDonald Lee <donald@asix.com.tw>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 53c6bc24

drivers/usb/serial/mos7840.c

+57 −26
Original line number Diff line number Diff line
@@ -174,6 +174,7 @@ 


#define CLK_MULTI_REGISTER         ((__u16)(0x02))

#define CLK_START_VALUE_REGISTER   ((__u16)(0x03))

#define GPIO_REGISTER              ((__u16)(0x07))



#define SERIAL_LCR_DLAB            ((__u16)(0x0080))
@@ -1101,7 +1102,17 @@ static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port) 
	mos7840_port->read_urb = port->read_urb;



	/* set up our bulk in urb */



	if ((serial->num_ports == 2)

		&& ((((__u16)port->number -

			(__u16)(port->serial->minor)) % 2) != 0)) {

		usb_fill_bulk_urb(mos7840_port->read_urb,

			serial->dev,

			usb_rcvbulkpipe(serial->dev,

				(port->bulk_in_endpointAddress) + 2),

			port->bulk_in_buffer,

			mos7840_port->read_urb->transfer_buffer_length,

			mos7840_bulk_in_callback, mos7840_port);

	} else {

		usb_fill_bulk_urb(mos7840_port->read_urb,

			serial->dev,

			usb_rcvbulkpipe(serial->dev,
@@ -1109,6 +1120,7 @@ static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port) 
			port->bulk_in_buffer,

			mos7840_port->read_urb->transfer_buffer_length,

			mos7840_bulk_in_callback, mos7840_port);

	}



	dbg("mos7840_open: bulkin endpoint is %d",

	    port->bulk_in_endpointAddress);
@@ -1519,6 +1531,17 @@ static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port, 
	memcpy(urb->transfer_buffer, current_position, transfer_size);



	/* fill urb with data and submit  */

	if ((serial->num_ports == 2)

		&& ((((__u16)port->number -

			(__u16)(port->serial->minor)) % 2) != 0)) {

		usb_fill_bulk_urb(urb,

			serial->dev,

			usb_sndbulkpipe(serial->dev,

				(port->bulk_out_endpointAddress) + 2),

			urb->transfer_buffer,

			transfer_size,

			mos7840_bulk_out_data_callback, mos7840_port);

	} else {

		usb_fill_bulk_urb(urb,

			serial->dev,

			usb_sndbulkpipe(serial->dev,
@@ -1526,6 +1549,7 @@ static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port, 
			urb->transfer_buffer,

			transfer_size,

			mos7840_bulk_out_data_callback, mos7840_port);

	}



	data1 = urb->transfer_buffer;

	dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
@@ -2305,19 +2329,26 @@ static int mos7840_ioctl(struct tty_struct *tty, 


static int mos7840_calc_num_ports(struct usb_serial *serial)

{

	int mos7840_num_ports = 0;



	dbg("numberofendpoints: cur %d, alt %d",

	    (int)serial->interface->cur_altsetting->desc.bNumEndpoints,

	    (int)serial->interface->altsetting->desc.bNumEndpoints);

	if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {

		mos7840_num_ports = serial->num_ports = 2;

	} else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {

	__u16 Data = 0x00;

	int ret = 0;

	int mos7840_num_ports;



	ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),

		MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &Data,

		VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);



	if ((Data & 0x01) == 0) {

		mos7840_num_ports = 2;

		serial->num_bulk_in = 2;

		serial->num_bulk_out = 2;

		serial->num_ports = 2;

	} else {

		mos7840_num_ports = 4;

		serial->num_bulk_in = 4;

		serial->num_bulk_out = 4;

		mos7840_num_ports = serial->num_ports = 4;

		serial->num_ports = 4;

	}

	dbg ("mos7840_num_ports = %d", mos7840_num_ports);



	return mos7840_num_ports;

}

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