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SubjectPatch "USB: serial: mos7840: Supported MCS7810 device"
Date
Hi Greg,

I am re-submitting this patch that supports MCS7810 device for the mos7840
driver. This patch was created against 3.4-rc1 and has been verified on
3.4-rc1 also. If you see any problem regarding this patch, please let me
know at any time. Thank you for your help.

Besides, I found two things regarding 3.4-rc, firstly, it added a macro to
replace module_init() and module_exit(); secondly, the system will crash if
I remove module before unplug the dongle; while this issue doesn't happen on
Linux kernel 3.2.9. I had been tested mcs7840 and prolific-pl2303, both
drivers have the same scenario. I am not sure if this issue is relating to
the macro added in 3.4-rc and would like to know if you have any comment on
this issue.

Regards,
Donald

Patch Description:
This patch added the support of MCS7810 device for the mos7840 driver. The
MCS7810 device supports single USB2.0-to-Serial port with a LED indicator
for reflecting transmission or reception activity.

Signed-off-by: Donald Lee <donald@asix.com.tw>
---
drivers/usb/serial/mos7840.c | 215
++++++++++++++++++++++++++++++++++++++++--
1 files changed, 208 insertions(+), 7 deletions(-)
diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index c526550..1c85654 100644
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -114,6 +114,7 @@
#define USB_VENDOR_ID_MOSCHIP 0x9710
#define MOSCHIP_DEVICE_ID_7840 0x7840
#define MOSCHIP_DEVICE_ID_7820 0x7820
+#define MOSCHIP_DEVICE_ID_7810 0x7810
/* The native component can have its vendor/device id's overridden
* in vendor-specific implementations. Such devices can be handled
* by making a change here, in moschip_port_id_table, and in
@@ -184,10 +185,17 @@
#define NUM_URBS 16 /* URB Count */
#define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */

+/* MCS7810 LED support */
+#define MCS7810_HAS_LED
+
+/* MCS7810 LED on/off milliseconds*/
+#define MCS7810_LED_ON_MS 500
+#define MCS7810_LED_OFF_MS 500

static const struct usb_device_id moschip_port_id_table[] = {
{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
+ {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
@@ -209,6 +217,7 @@ static const struct usb_device_id
moschip_port_id_table[] = {
static const struct usb_device_id moschip_id_table_combined[]
__devinitconst = {
{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
+ {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
@@ -261,6 +270,13 @@ struct moschip_port {
struct urb *write_urb_pool[NUM_URBS];
char busy[NUM_URBS];
bool read_urb_busy;
+
+#ifdef MCS7810_HAS_LED
+ /* For MCS7810 LED */
+ int mos7810_led_flag;
+ struct timer_list mos7810_led_timer1; /* Timer for LED on */
+ struct timer_list mos7810_led_timer2; /* Timer for LED off */
+#endif
};


@@ -572,6 +588,71 @@ static int mos7840_get_reg(struct moschip_port *mcs,
__u16 Wval, __u16 reg,
return ret;
}

+#ifdef MCS7810_HAS_LED
+static void mos7810_control_callback(struct urb *urb)
+{
+ switch (urb->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__,
+ urb->status);
+ break;
+ default:
+ dbg("%s - nonzero urb status received: %d", __func__,
+ urb->status);
+ }
+}
+
+static void mos7810_set_led_async(struct moschip_port *mcs, __u16 wval,
+ __u16 reg)
+{
+ struct usb_device *dev = mcs->port->serial->dev;
+ struct usb_ctrlrequest *dr = mcs->dr;
+
+ dr->bRequestType = MCS_WR_RTYPE;
+ dr->bRequest = MCS_WRREQ;
+ dr->wValue = cpu_to_le16(wval);
+ dr->wIndex = cpu_to_le16(reg);
+ dr->wLength = cpu_to_le16(0);
+
+ usb_fill_control_urb(mcs->control_urb, dev, usb_sndctrlpipe(dev, 0),
+ (unsigned char *)dr, NULL, 0, mos7810_control_callback,
NULL);
+
+ usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
+}
+
+static void mos7810_set_led_sync(struct usb_serial_port *port, __u16 reg,
+ __u16 val)
+{
+ struct usb_device *dev = port->serial->dev;
+
+ usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
MCS_WR_RTYPE,
+ val, reg, NULL, 0, MOS_WDR_TIMEOUT);
+}
+
+static void mos7810_led_off(unsigned long arg)
+{
+ struct moschip_port *mcs = (struct moschip_port *) arg;
+
+ /* Turn off MCS7810 LED */
+ mos7810_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
+ mod_timer(&mcs->mos7810_led_timer2,
+ jiffies +
msecs_to_jiffies(MCS7810_LED_OFF_MS));
+}
+
+static void mos7810_led_flag_off(unsigned long arg)
+{
+ struct moschip_port *mcs = (struct moschip_port *) arg;
+
+ mcs->mos7810_led_flag = 0;
+}
+#endif
+

/***************************************************************************
**
* mos7840_interrupt_callback
* this is the callback function for when we have received data on the
@@ -792,6 +873,16 @@ static void mos7840_bulk_in_callback(struct urb *urb)
return;
}

+#ifdef MCS7810_HAS_LED
+ /* Turn on MCS7810 LED */
+ if (serial->num_ports == 1 && mos7840_port->mos7810_led_flag == 0) {
+ mos7840_port->mos7810_led_flag = 1;
+ mos7810_set_led_async(mos7840_port, 0x0301,
+ MODEM_CONTROL_REGISTER);
+ mod_timer(&mos7840_port->mos7810_led_timer1,
+ jiffies +
msecs_to_jiffies(MCS7810_LED_ON_MS));
+ }
+#endif

mos7840_port->read_urb_busy = true;
retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
@@ -1554,6 +1645,16 @@ static int mos7840_write(struct tty_struct *tty,
struct usb_serial_port *port,
data1 = urb->transfer_buffer;
dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);

+#ifdef MCS7810_HAS_LED
+ /* Turn on MCS7810 LED */
+ if (serial->num_ports == 1 && mos7840_port->mos7810_led_flag == 0) {
+ mos7840_port->mos7810_led_flag = 1;
+ mos7810_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0301);
+ mod_timer(&mos7840_port->mos7810_led_timer1,
+ jiffies +
msecs_to_jiffies(MCS7810_LED_ON_MS));
+ }
+#endif
+
/* send it down the pipe */
status = usb_submit_urb(urb, GFP_ATOMIC);

@@ -2327,26 +2428,86 @@ static int mos7840_ioctl(struct tty_struct *tty,
return -ENOIOCTLCMD;
}

+static int mos7810_check(struct usb_serial *serial)
+{
+ int i, pass_count = 0;
+ __u16 data = 0, mcr_data = 0;
+ __u16 test_pattern = 0x55AA;
+
+ /* Store MCR setting */
+ usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
+ MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
+ &mcr_data, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
+
+ for (i = 0; i < 16; i++) {
+ /* Send the 1-bit test pattern out to MCS7810 test pin */
+ usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev,
0),
+ MCS_WRREQ, MCS_WR_RTYPE,
+ (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
+ MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
+
+ /* Read the test pattern back */
+ 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 this is a MCS7810 device, both test patterns must
match */
+ if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
+ break;
+
+ pass_count++;
+ }
+
+ /* Restore MCR setting */
+ usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
MCS_WRREQ,
+ MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER,
NULL,
+ 0, MOS_WDR_TIMEOUT);
+
+ if (pass_count == 16)
+ return 1;
+
+ return 0;
+}
+
static int mos7840_calc_num_ports(struct usb_serial *serial)
{
- __u16 Data = 0x00;
+ __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,
+ MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);

- if ((Data & 0x01) == 0) {
+ if (serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7810) {
+ mos7840_num_ports = 1;
+ serial->num_bulk_in = 1;
+ serial->num_bulk_out = 1;
+ serial->num_ports = 1;
+ } else if (serial->dev->descriptor.idProduct ==
+ MOSCHIP_DEVICE_ID_7820) {
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;
- serial->num_ports = 4;
+ /* For a MCS7840 device GPIO0 must be set to 1*/
+ if ((data & 0x01) == 1) {
+ mos7840_num_ports = 4;
+ serial->num_bulk_in = 4;
+ serial->num_bulk_out = 4;
+ serial->num_ports = 4;
+ } else if (mos7810_check(serial)) {
+ mos7840_num_ports = 1;
+ serial->num_bulk_in = 1;
+ serial->num_bulk_out = 1;
+ serial->num_ports = 1;
+ } else {
+ mos7840_num_ports = 2;
+ serial->num_bulk_in = 2;
+ serial->num_bulk_out = 2;
+ serial->num_ports = 2;
+ }
}

return mos7840_num_ports;
@@ -2563,6 +2724,33 @@ static int mos7840_startup(struct usb_serial *serial)
status = -ENOMEM;
goto error;
}
+
+#ifdef MCS7810_HAS_LED
+ /* Initialize MCS7810 LED timers */
+ if (serial->num_ports == 1) {
+ init_timer(&mos7840_port->mos7810_led_timer1);
+ mos7840_port->mos7810_led_timer1.function =
+ mos7810_led_off;
+ mos7840_port->mos7810_led_timer1.expires =
+ jiffies +
msecs_to_jiffies(MCS7810_LED_ON_MS);
+ mos7840_port->mos7810_led_timer1.data =
+ (unsigned long)mos7840_port;
+
+ init_timer(&mos7840_port->mos7810_led_timer2);
+ mos7840_port->mos7810_led_timer2.function =
+
mos7810_led_flag_off;
+ mos7840_port->mos7810_led_timer2.expires =
+ jiffies +
msecs_to_jiffies(MCS7810_LED_OFF_MS);
+ mos7840_port->mos7810_led_timer2.data =
+ (unsigned long)mos7840_port;
+
+ mos7840_port->mos7810_led_flag = 0;
+
+ /* Turn off MCS7810 LED */
+ mos7810_set_led_sync(serial->port[i],
+ MODEM_CONTROL_REGISTER,
0x0300);
+ }
+#endif
}
dbg ("mos7840_startup: all ports configured...........");

@@ -2638,6 +2826,7 @@ static void mos7840_release(struct usb_serial *serial)
{
int i;
struct moschip_port *mos7840_port;
+
dbg("%s", " release :entering..........");

if (!serial) {
@@ -2654,6 +2843,18 @@ static void mos7840_release(struct usb_serial
*serial)
mos7840_port = mos7840_get_port_private(serial->port[i]);
dbg("mos7840_port %d = %p", i, mos7840_port);
if (mos7840_port) {
+#ifdef MCS7810_HAS_LED
+ if (serial->num_ports == 1) {
+ /* Turn off MCS7810 LED */
+ mos7810_set_led_sync(mos7840_port->port,
+ MODEM_CONTROL_REGISTER,
0x0300);
+
+ del_timer_sync(&mos7840_port->
+ mos7810_led_timer1);
+ del_timer_sync(&mos7840_port->
+ mos7810_led_timer2);
+ }
+#endif
kfree(mos7840_port->ctrl_buf);
kfree(mos7840_port->dr);
kfree(mos7840_port);
--
1.7.7.6




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