* [PATCH v2 2/3] USB: serial: cp210x: Added comments to CRTSCTS flag code.
@ 2016-04-30 2:22 Konstantin Shkolnyy
2016-05-03 9:44 ` David Laight
0 siblings, 1 reply; 4+ messages in thread
From: Konstantin Shkolnyy @ 2016-04-30 2:22 UTC (permalink / raw)
To: johan; +Cc: linux-usb, linux-kernel, Konstantin Shkolnyy
Replaced magic numbers used in the CRTSCTS flag code with symbolic names
from the chip specification.
Signed-off-by: Konstantin Shkolnyy <konstantin.shkolnyy@gmail.com>
---
Changes in v2:
Improved CRTSCTS fix based on feedback. Dropped get_termios error handling.
drivers/usb/serial/cp210x.c | 93 +++++++++++++++++++++++++++++++++------------
1 file changed, 69 insertions(+), 24 deletions(-)
diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index abcdb63..da0567c 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -323,6 +323,40 @@ struct cp210x_comm_status {
*/
#define PURGE_ALL 0x000f
+/* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
+struct cp210x_flow_ctl {
+ __le32 ulControlHandshake;
+ __le32 ulFlowReplace;
+ __le32 ulXonLimit;
+ __le32 ulXoffLimit;
+} __packed;
+
+/* cp210x_flow_ctl::ulControlHandshake */
+#define SERIAL_DTR_MASK 0x00000003
+#define SERIAL_CTS_HANDSHAKE 0x00000008
+#define SERIAL_DSR_HANDSHAKE 0x00000010
+#define SERIAL_DCD_HANDSHAKE 0x00000020
+#define SERIAL_DSR_SENSITIVITY 0x00000040
+
+/* values for cp210x_flow_ctl::ulControlHandshake::SERIAL_DTR_MASK */
+#define SERIAL_DTR_INACTIVE 0x00000000
+#define SERIAL_DTR_ACTIVE 0x00000001
+#define SERIAL_DTR_FLOW_CTL 0x00000002
+
+/* cp210x_flow_ctl::ulFlowReplace */
+#define SERIAL_AUTO_TRANSMIT 0x00000001
+#define SERIAL_AUTO_RECEIVE 0x00000002
+#define SERIAL_ERROR_CHAR 0x00000004
+#define SERIAL_NULL_STRIPPING 0x00000008
+#define SERIAL_BREAK_CHAR 0x00000010
+#define SERIAL_RTS_MASK 0x000000c0
+#define SERIAL_XOFF_CONTINUE 0x80000000
+
+/* values for cp210x_flow_ctl::ulFlowReplace::SERIAL_RTS_MASK */
+#define SERIAL_RTS_INACTIVE 0x00000000
+#define SERIAL_RTS_ACTIVE 0x00000040
+#define SERIAL_RTS_FLOW_CTL 0x00000080
+
/*
* Reads a variable-sized block of CP210X_ registers, identified by req.
* Returns data into buf in native USB byte order.
@@ -690,7 +724,7 @@ static void cp210x_get_termios_port(struct usb_serial_port *port,
{
struct device *dev = &port->dev;
unsigned int cflag;
- u8 modem_ctl[16];
+ struct cp210x_flow_ctl flow_ctl;
u32 baud;
u16 bits;
@@ -788,9 +822,9 @@ static void cp210x_get_termios_port(struct usb_serial_port *port,
break;
}
- cp210x_read_reg_block(port, CP210X_GET_FLOW, modem_ctl,
- sizeof(modem_ctl));
- if (modem_ctl[0] & 0x08) {
+ cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
+ sizeof(flow_ctl));
+ if (le32_to_cpu(flow_ctl.ulControlHandshake) & SERIAL_CTS_HANDSHAKE) {
dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
cflag |= CRTSCTS;
} else {
@@ -859,7 +893,6 @@ static void cp210x_set_termios(struct tty_struct *tty,
struct device *dev = &port->dev;
unsigned int cflag, old_cflag;
u16 bits;
- u8 modem_ctl[16];
cflag = tty->termios.c_cflag;
old_cflag = old_termios->c_cflag;
@@ -944,33 +977,45 @@ static void cp210x_set_termios(struct tty_struct *tty,
if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
- /* Only bytes 0, 4 and 7 out of first 8 have functional bits */
+ struct cp210x_flow_ctl flow_ctl;
+ u32 ControlHandshake;
+ u32 FlowReplace;
- cp210x_read_reg_block(port, CP210X_GET_FLOW, modem_ctl,
- sizeof(modem_ctl));
- dev_dbg(dev, "%s - read modem controls = %02x .. .. .. %02x .. .. %02x\n",
- __func__, modem_ctl[0], modem_ctl[4], modem_ctl[7]);
+ cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
+ sizeof(flow_ctl));
+ ControlHandshake = le32_to_cpu(flow_ctl.ulControlHandshake);
+ FlowReplace = le32_to_cpu(flow_ctl.ulFlowReplace);
+ dev_dbg(dev, "%s - read ulControlHandshake=%08x ulFlowReplace=%08x\n",
+ __func__, ControlHandshake, FlowReplace);
if (cflag & CRTSCTS) {
- modem_ctl[0] &= ~0x7B;
- modem_ctl[0] |= 0x09;
- modem_ctl[4] = 0x80;
- /* FIXME - why clear reserved bits just read? */
- modem_ctl[5] = 0;
- modem_ctl[6] = 0;
- modem_ctl[7] = 0;
+ ControlHandshake &= ~(SERIAL_DTR_MASK |
+ SERIAL_CTS_HANDSHAKE | SERIAL_DSR_HANDSHAKE |
+ SERIAL_DCD_HANDSHAKE | SERIAL_DSR_SENSITIVITY);
+ ControlHandshake |= SERIAL_DTR_ACTIVE;
+ ControlHandshake |= SERIAL_CTS_HANDSHAKE;
+ /* FIXME why clear bits unrelated to flow control */
+ /* FIXME why clear _XOFF_CONTINUE which is never set */
+ FlowReplace &= ~0xffffffff;
+ FlowReplace |= SERIAL_RTS_FLOW_CTL;
dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
} else {
- modem_ctl[0] &= ~0x7B;
- modem_ctl[0] |= 0x01;
- modem_ctl[4] = 0x40;
+ ControlHandshake &= ~(SERIAL_DTR_MASK |
+ SERIAL_CTS_HANDSHAKE | SERIAL_DSR_HANDSHAKE |
+ SERIAL_DCD_HANDSHAKE | SERIAL_DSR_SENSITIVITY);
+ ControlHandshake |= SERIAL_DTR_ACTIVE;
+ /* FIXME - why clear bits unrelated to flow control */
+ FlowReplace &= ~0xff;
+ FlowReplace |= SERIAL_RTS_ACTIVE;
dev_dbg(dev, "%s - flow control = NONE\n", __func__);
}
- dev_dbg(dev, "%s - write modem controls = %02x .. .. .. %02x .. .. %02x\n",
- __func__, modem_ctl[0], modem_ctl[4], modem_ctl[7]);
- cp210x_write_reg_block(port, CP210X_SET_FLOW, modem_ctl,
- sizeof(modem_ctl));
+ dev_dbg(dev, "%s - write ulControlHandshake=%08x ulFlowReplace=%08x\n",
+ __func__, ControlHandshake, FlowReplace);
+ flow_ctl.ulControlHandshake = cpu_to_le32(ControlHandshake);
+ flow_ctl.ulFlowReplace = cpu_to_le32(FlowReplace);
+ cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
+ sizeof(flow_ctl));
}
}
--
1.8.4.5
^ permalink raw reply related [flat|nested] 4+ messages in thread
* RE: [PATCH v2 2/3] USB: serial: cp210x: Added comments to CRTSCTS flag code.
2016-04-30 2:22 [PATCH v2 2/3] USB: serial: cp210x: Added comments to CRTSCTS flag code Konstantin Shkolnyy
@ 2016-05-03 9:44 ` David Laight
2016-05-03 12:11 ` [EXT] " Konstantin Shkolnyy
0 siblings, 1 reply; 4+ messages in thread
From: David Laight @ 2016-05-03 9:44 UTC (permalink / raw)
To: 'Konstantin Shkolnyy', johan; +Cc: linux-usb, linux-kernel
From: Konstantin Shkolnyy
> Sent: 30 April 2016 03:22
> Replaced magic numbers used in the CRTSCTS flag code with symbolic names
> from the chip specification.
>
> Signed-off-by: Konstantin Shkolnyy <konstantin.shkolnyy@gmail.com>
> ---
> Changes in v2:
> Improved CRTSCTS fix based on feedback. Dropped get_termios error handling.
>
> drivers/usb/serial/cp210x.c | 93 +++++++++++++++++++++++++++++++++------------
> 1 file changed, 69 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
...
> +/* cp210x_flow_ctl::ulControlHandshake */
> +#define SERIAL_DTR_MASK 0x00000003
> +#define SERIAL_CTS_HANDSHAKE 0x00000008
> +#define SERIAL_DSR_HANDSHAKE 0x00000010
> +#define SERIAL_DCD_HANDSHAKE 0x00000020
> +#define SERIAL_DSR_SENSITIVITY 0x00000040
...
I'd have thought the names ought to start CP210X_
David
^ permalink raw reply [flat|nested] 4+ messages in thread
* RE: [EXT] RE: [PATCH v2 2/3] USB: serial: cp210x: Added comments to CRTSCTS flag code.
2016-05-03 9:44 ` David Laight
@ 2016-05-03 12:11 ` Konstantin Shkolnyy
2016-05-03 12:21 ` Johan Hovold
0 siblings, 1 reply; 4+ messages in thread
From: Konstantin Shkolnyy @ 2016-05-03 12:11 UTC (permalink / raw)
To: David Laight, 'Konstantin Shkolnyy', johan
Cc: linux-usb, linux-kernel
> -----Original Message-----
> From: linux-usb-owner@vger.kernel.org [mailto:linux-usb-
> owner@vger.kernel.org] On Behalf Of David Laight
> Sent: Tuesday, May 03, 2016 04:44
> To: 'Konstantin Shkolnyy'; johan@kernel.org
> Cc: linux-usb@vger.kernel.org; linux-kernel@vger.kernel.org
> Subject: [EXT] RE: [PATCH v2 2/3] USB: serial: cp210x: Added comments to
> CRTSCTS flag code.
>
> From: Konstantin Shkolnyy
> > Sent: 30 April 2016 03:22
> > Replaced magic numbers used in the CRTSCTS flag code with symbolic
> names
> > from the chip specification.
> >
> > Signed-off-by: Konstantin Shkolnyy <konstantin.shkolnyy@gmail.com>
> > ---
> > Changes in v2:
> > Improved CRTSCTS fix based on feedback. Dropped get_termios error
> handling.
> >
> > drivers/usb/serial/cp210x.c | 93
> +++++++++++++++++++++++++++++++++------------
> > 1 file changed, 69 insertions(+), 24 deletions(-)
> >
> > diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
> ...
> > +/* cp210x_flow_ctl::ulControlHandshake */
> > +#define SERIAL_DTR_MASK 0x00000003
> > +#define SERIAL_CTS_HANDSHAKE 0x00000008
> > +#define SERIAL_DSR_HANDSHAKE 0x00000010
> > +#define SERIAL_DCD_HANDSHAKE 0x00000020
> > +#define SERIAL_DSR_SENSITIVITY 0x00000040
> ...
>
> I'd have thought the names ought to start CP210X_
>
These names are inherited from the Labs chip spec.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [EXT] RE: [PATCH v2 2/3] USB: serial: cp210x: Added comments to CRTSCTS flag code.
2016-05-03 12:11 ` [EXT] " Konstantin Shkolnyy
@ 2016-05-03 12:21 ` Johan Hovold
0 siblings, 0 replies; 4+ messages in thread
From: Johan Hovold @ 2016-05-03 12:21 UTC (permalink / raw)
To: Konstantin Shkolnyy
Cc: David Laight, 'Konstantin Shkolnyy',
johan, linux-usb, linux-kernel
On Tue, May 03, 2016 at 12:11:53PM +0000, Konstantin Shkolnyy wrote:
> > -----Original Message-----
> > From: linux-usb-owner@vger.kernel.org [mailto:linux-usb-
> > owner@vger.kernel.org] On Behalf Of David Laight
> > Sent: Tuesday, May 03, 2016 04:44
> > To: 'Konstantin Shkolnyy'; johan@kernel.org
> > Cc: linux-usb@vger.kernel.org; linux-kernel@vger.kernel.org
> > Subject: [EXT] RE: [PATCH v2 2/3] USB: serial: cp210x: Added comments to
> > CRTSCTS flag code.
> >
> > From: Konstantin Shkolnyy
> > > Sent: 30 April 2016 03:22
> > > Replaced magic numbers used in the CRTSCTS flag code with symbolic
> > names
> > > from the chip specification.
> > >
> > > Signed-off-by: Konstantin Shkolnyy <konstantin.shkolnyy@gmail.com>
> > > ---
> > > Changes in v2:
> > > Improved CRTSCTS fix based on feedback. Dropped get_termios error
> > handling.
> > >
> > > drivers/usb/serial/cp210x.c | 93
> > +++++++++++++++++++++++++++++++++------------
> > > 1 file changed, 69 insertions(+), 24 deletions(-)
> > >
> > > diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
> > ...
> > > +/* cp210x_flow_ctl::ulControlHandshake */
> > > +#define SERIAL_DTR_MASK 0x00000003
> > > +#define SERIAL_CTS_HANDSHAKE 0x00000008
> > > +#define SERIAL_DSR_HANDSHAKE 0x00000010
> > > +#define SERIAL_DCD_HANDSHAKE 0x00000020
> > > +#define SERIAL_DSR_SENSITIVITY 0x00000040
> > ...
> >
> > I'd have thought the names ought to start CP210X_
>
> These names are inherited from the Labs chip spec.
Yes, but it's still a good idea to add a CP210X_ prefix to avoid any
confusion with the serial-core defines.
Thanks,
Johan
^ permalink raw reply [flat|nested] 4+ messages in thread
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2016-04-30 2:22 [PATCH v2 2/3] USB: serial: cp210x: Added comments to CRTSCTS flag code Konstantin Shkolnyy
2016-05-03 9:44 ` David Laight
2016-05-03 12:11 ` [EXT] " Konstantin Shkolnyy
2016-05-03 12:21 ` Johan Hovold
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