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path: root/drivers/usb/serial/mos7720.c
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Diffstat (limited to 'drivers/usb/serial/mos7720.c')
-rw-r--r--drivers/usb/serial/mos7720.c185
1 files changed, 155 insertions, 30 deletions
diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
index 763e32a44be0..0d47f2c4d59f 100644
--- a/drivers/usb/serial/mos7720.c
+++ b/drivers/usb/serial/mos7720.c
@@ -81,12 +81,15 @@ struct moschip_serial {
static int debug;
+static struct usb_serial_driver moschip7720_2port_driver;
+
#define USB_VENDOR_ID_MOSCHIP 0x9710
#define MOSCHIP_DEVICE_ID_7720 0x7720
#define MOSCHIP_DEVICE_ID_7715 0x7715
-static struct usb_device_id moschip_port_id_table[] = {
+static const struct usb_device_id moschip_port_id_table[] = {
{ USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) },
+ { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) },
{ } /* terminating entry */
};
MODULE_DEVICE_TABLE(usb, moschip_port_id_table);
@@ -106,7 +109,7 @@ static void mos7720_interrupt_callback(struct urb *urb)
__u8 sp1;
__u8 sp2;
- dbg("%s", " : Entering\n");
+ dbg(" : Entering");
switch (status) {
case 0:
@@ -186,6 +189,75 @@ exit:
}
/*
+ * mos7715_interrupt_callback
+ * this is the 7715's callback function for when we have received data on
+ * the interrupt endpoint.
+ */
+static void mos7715_interrupt_callback(struct urb *urb)
+{
+ int result;
+ int length;
+ int status = urb->status;
+ __u8 *data;
+ __u8 iir;
+
+ switch (status) {
+ case 0:
+ /* success */
+ break;
+ case -ECONNRESET:
+ case -ENOENT:
+ case -ESHUTDOWN:
+ /* this urb is terminated, clean up */
+ dbg("%s - urb shutting down with status: %d", __func__,
+ status);
+ return;
+ default:
+ dbg("%s - nonzero urb status received: %d", __func__,
+ status);
+ goto exit;
+ }
+
+ length = urb->actual_length;
+ data = urb->transfer_buffer;
+
+ /* Structure of data from 7715 device:
+ * Byte 1: IIR serial Port
+ * Byte 2: unused
+ * Byte 2: DSR parallel port
+ * Byte 4: FIFO status for both */
+
+ if (unlikely(length != 4)) {
+ dbg("Wrong data !!!");
+ return;
+ }
+
+ iir = data[0];
+ if (!(iir & 0x01)) { /* serial port interrupt pending */
+ switch (iir & 0x0f) {
+ case SERIAL_IIR_RLS:
+ dbg("Serial Port: Receiver status error or address "
+ "bit detected in 9-bit mode\n");
+ break;
+ case SERIAL_IIR_CTI:
+ dbg("Serial Port: Receiver time out");
+ break;
+ case SERIAL_IIR_MS:
+ dbg("Serial Port: Modem status change");
+ break;
+ }
+ }
+
+exit:
+ result = usb_submit_urb(urb, GFP_ATOMIC);
+ if (result)
+ dev_err(&urb->dev->dev,
+ "%s - Error %d submitting control urb\n",
+ __func__, result);
+ return;
+}
+
+/*
* mos7720_bulk_in_callback
* this is the callback function for when we have received data on the
* bulk in endpoint.
@@ -206,7 +278,7 @@ static void mos7720_bulk_in_callback(struct urb *urb)
mos7720_port = urb->context;
if (!mos7720_port) {
- dbg("%s", "NULL mos7720_port pointer \n");
+ dbg("NULL mos7720_port pointer");
return ;
}
@@ -218,7 +290,6 @@ static void mos7720_bulk_in_callback(struct urb *urb)
tty = tty_port_tty_get(&port->port);
if (tty && urb->actual_length) {
- tty_buffer_request_room(tty, urb->actual_length);
tty_insert_flip_string(tty, data, urb->actual_length);
tty_flip_buffer_push(tty);
}
@@ -275,17 +346,15 @@ static void mos7720_bulk_out_data_callback(struct urb *urb)
* this function will be used for sending command to device
*/
static int send_mos_cmd(struct usb_serial *serial, __u8 request, __u16 value,
- __u16 index, void *data)
+ __u16 index, u8 *data)
{
int status;
- unsigned int pipe;
+ u8 *buf;
u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
- __u8 requesttype;
- __u16 size = 0x0000;
if (value < MOS_MAX_PORT) {
if (product == MOSCHIP_DEVICE_ID_7715)
- value = value*0x100+0x100;
+ value = 0x0200; /* identifies the 7715's serial port */
else
value = value*0x100+0x200;
} else {
@@ -298,27 +367,58 @@ static int send_mos_cmd(struct usb_serial *serial, __u8 request, __u16 value,
}
if (request == MOS_WRITE) {
- request = (__u8)MOS_WRITE;
- requesttype = (__u8)0x40;
- value = value + (__u16)*((unsigned char *)data);
- data = NULL;
- pipe = usb_sndctrlpipe(serial->dev, 0);
+ value = value + *data;
+ status = usb_control_msg(serial->dev,
+ usb_sndctrlpipe(serial->dev, 0), MOS_WRITE,
+ 0x40, value, index, NULL, 0, MOS_WDR_TIMEOUT);
} else {
- request = (__u8)MOS_READ;
- requesttype = (__u8)0xC0;
- size = 0x01;
- pipe = usb_rcvctrlpipe(serial->dev, 0);
+ buf = kmalloc(1, GFP_KERNEL);
+ if (!buf) {
+ status = -ENOMEM;
+ goto out;
+ }
+ status = usb_control_msg(serial->dev,
+ usb_rcvctrlpipe(serial->dev, 0), MOS_READ,
+ 0xc0, value, index, buf, 1, MOS_WDR_TIMEOUT);
+ *data = *buf;
+ kfree(buf);
}
-
- status = usb_control_msg(serial->dev, pipe, request, requesttype,
- value, index, data, size, MOS_WDR_TIMEOUT);
-
+out:
if (status < 0)
- dbg("Command Write failed Value %x index %x\n", value, index);
+ dbg("Command Write failed Value %x index %x", value, index);
return status;
}
+
+/*
+ * mos77xx_probe
+ * this function installs the appropriate read interrupt endpoint callback
+ * depending on whether the device is a 7720 or 7715, thus avoiding costly
+ * run-time checks in the high-frequency callback routine itself.
+ */
+static int mos77xx_probe(struct usb_serial *serial,
+ const struct usb_device_id *id)
+{
+ if (id->idProduct == MOSCHIP_DEVICE_ID_7715)
+ moschip7720_2port_driver.read_int_callback =
+ mos7715_interrupt_callback;
+ else
+ moschip7720_2port_driver.read_int_callback =
+ mos7720_interrupt_callback;
+
+ return 0;
+}
+
+static int mos77xx_calc_num_ports(struct usb_serial *serial)
+{
+ u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
+ if (product == MOSCHIP_DEVICE_ID_7715)
+ return 1;
+
+ return 2;
+}
+
static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
{
struct usb_serial *serial;
@@ -390,7 +490,7 @@ static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
*/
port_number = port->number - port->serial->minor;
send_mos_cmd(port->serial, MOS_READ, port_number, UART_LSR, &data);
- dbg("SS::%p LSR:%x\n", mos7720_port, data);
+ dbg("SS::%p LSR:%x", mos7720_port, data);
dbg("Check:Sending Command ..........");
@@ -729,7 +829,7 @@ static void mos7720_throttle(struct tty_struct *tty)
struct moschip_port *mos7720_port;
int status;
- dbg("%s- port %d\n", __func__, port->number);
+ dbg("%s- port %d", __func__, port->number);
mos7720_port = usb_get_serial_port_data(port);
@@ -1208,7 +1308,7 @@ static void mos7720_set_termios(struct tty_struct *tty,
return;
}
- dbg("%s\n", "setting termios - ASPIRE");
+ dbg("setting termios - ASPIRE");
cflag = tty->termios->c_cflag;
@@ -1226,7 +1326,7 @@ static void mos7720_set_termios(struct tty_struct *tty,
change_port_settings(tty, mos7720_port, old_termios);
if (!port->read_urb) {
- dbg("%s", "URB KILLED !!!!!\n");
+ dbg("URB KILLED !!!!!");
return;
}
@@ -1495,6 +1595,7 @@ static int mos7720_startup(struct usb_serial *serial)
struct usb_device *dev;
int i;
char data;
+ u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
dbg("%s: Entering ..........", __func__);
@@ -1514,6 +1615,29 @@ static int mos7720_startup(struct usb_serial *serial)
usb_set_serial_data(serial, mos7720_serial);
+ /*
+ * The 7715 uses the first bulk in/out endpoint pair for the parallel
+ * port, and the second for the serial port. Because the usbserial core
+ * assumes both pairs are serial ports, we must engage in a bit of
+ * subterfuge and swap the pointers for ports 0 and 1 in order to make
+ * port 0 point to the serial port. However, both moschip devices use a
+ * single interrupt-in endpoint for both ports (as mentioned a little
+ * further down), and this endpoint was assigned to port 0. So after
+ * the swap, we must copy the interrupt endpoint elements from port 1
+ * (as newly assigned) to port 0, and null out port 1 pointers.
+ */
+ if (product == MOSCHIP_DEVICE_ID_7715) {
+ struct usb_serial_port *tmp = serial->port[0];
+ serial->port[0] = serial->port[1];
+ serial->port[1] = tmp;
+ serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb;
+ serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer;
+ serial->port[0]->interrupt_in_endpointAddress =
+ tmp->interrupt_in_endpointAddress;
+ serial->port[1]->interrupt_in_urb = NULL;
+ serial->port[1]->interrupt_in_buffer = NULL;
+ }
+
/* we set up the pointers to the endpoints in the mos7720_open *
* function, as the structures aren't created yet. */
@@ -1529,7 +1653,7 @@ static int mos7720_startup(struct usb_serial *serial)
/* Initialize all port interrupt end point to port 0 int
* endpoint. Our device has only one interrupt endpoint
- * comman to all ports */
+ * common to all ports */
serial->port[i]->interrupt_in_endpointAddress =
serial->port[0]->interrupt_in_endpointAddress;
@@ -1584,11 +1708,12 @@ static struct usb_serial_driver moschip7720_2port_driver = {
.description = "Moschip 2 port adapter",
.usb_driver = &usb_driver,
.id_table = moschip_port_id_table,
- .num_ports = 2,
+ .calc_num_ports = mos77xx_calc_num_ports,
.open = mos7720_open,
.close = mos7720_close,
.throttle = mos7720_throttle,
.unthrottle = mos7720_unthrottle,
+ .probe = mos77xx_probe,
.attach = mos7720_startup,
.release = mos7720_release,
.ioctl = mos7720_ioctl,
@@ -1600,7 +1725,7 @@ static struct usb_serial_driver moschip7720_2port_driver = {
.chars_in_buffer = mos7720_chars_in_buffer,
.break_ctl = mos7720_break,
.read_bulk_callback = mos7720_bulk_in_callback,
- .read_int_callback = mos7720_interrupt_callback,
+ .read_int_callback = NULL /* dynamically assigned in probe() */
};
static int __init moschip7720_init(void)