From 093ea2d3a766cb8a4c4de57efec6c0a127a58792 Mon Sep 17 00:00:00 2001 From: Donald Lee Date: Wed, 14 Mar 2012 15:26:33 +0800 Subject: [PATCH] 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: Donald Lee Cc: stable Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/mos7840.c | 83 +++++++++++++++++++++++++----------- 1 file changed, 57 insertions(+), 26 deletions(-) diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c index f7e6e30f53ee..c526550694a0 100644 --- a/drivers/usb/serial/mos7840.c +++ b/drivers/usb/serial/mos7840.c @@ -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)) @@ -1101,14 +1102,25 @@ 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 */ - - usb_fill_bulk_urb(mos7840_port->read_urb, - serial->dev, - usb_rcvbulkpipe(serial->dev, - port->bulk_in_endpointAddress), - port->bulk_in_buffer, - mos7840_port->read_urb->transfer_buffer_length, - mos7840_bulk_in_callback, mos7840_port); + 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, + port->bulk_in_endpointAddress), + 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); @@ -1519,13 +1531,25 @@ 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 */ - usb_fill_bulk_urb(urb, - serial->dev, - usb_sndbulkpipe(serial->dev, - port->bulk_out_endpointAddress), - urb->transfer_buffer, - transfer_size, - mos7840_bulk_out_data_callback, mos7840_port); + 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, + port->bulk_out_endpointAddress), + 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); @@ -1838,7 +1862,7 @@ static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port, } else { #ifdef HW_flow_control - / *setting h/w flow control bit to 0 */ + /* setting h/w flow control bit to 0 */ Data = 0xb; mos7840_port->shadowMCR = Data; status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, @@ -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; } -- 2.20.1