On Mon, Jul 01, 2019 at 08:21:14PM +0800, Charles Yeh wrote:
> Prolific has developed a new USB to UART chip: PL2303HXN
> PL2303HXN : PL2303GC/PL2303GS/PL2303GT/PL2303GL/PL2303GE/PL2303GB
> The Vendor request used by the PL2303HXN (TYPE_HXN) is different from
> the existing PL2303 series (TYPE_HX & TYPE_01).
> Therefore, different Vendor requests are used to issue related commands.
>
> 1. Added a new TYPE_HXN type in pl2303_type_data, and then executes
> new Vendor request,new flow control and other related instructions
> if TYPE_HXN is recognized.
>
> 2. Because the new PL2303HXN only accept the new Vendor request,
> the old Vendor request cannot be accepted (the error message
> will be returned)
> So first determine the TYPE_HX or TYPE_HXN through
> PL2303_READ_TYPE_HX_STATUS in pl2303_startup.
>
> 2.1 If the return message is "1", then the PL2303 is the existing
> TYPE_HX/ TYPE_01 series.
> The other settings in pl2303_startup are to continue execution.
> 2.2 If the return message is "not 1", then the PL2303 is the new
> TYPE_HXN series.
> The other settings in pl2303_startup are ignored.
> (PL2303HXN will directly use the default value in the hardware,
> no need to add additional settings through the software)
>
> 3. In pl2303_open: Because TYPE_HXN is different from the instruction of reset
> down/up stream used by TYPE_HX.
> Therefore, we will also execute different instructions here.
> The default of chip Reset Control is 0xFF(TYPE_HXN), therefore we will
> write 0x00 to reset down/up stream(TYPE_HXN).
>
> 4. In pl2303_set_termios: The UART flow control instructions used by
> TYPE_HXN/TYPE_HX/TYPE_01 are different.
> Therefore, we will also execute different instructions here.
>
> 5. In pl2303_vendor_read & pl2303_vendor_write, since TYPE_HXN is different
> from the vendor request instruction used by TYPE_HX/TYPE_01,
> it will also execute different instructions here.
>
> 6. In pl2303_update_reg: TYPE_HXN used different register for flow control.
> Therefore, we will also execute different instructions here.
>
> Signed-off-by: Charles Yeh <charlesyeh...@gmail.com>
> ---
> changelog:
> v6:
> 1. Modify pl2303_update_reg:TYPE_HXN used different register for flow control.
> Therefore, we will also execute different instructions here.
> 2. Modify define name: PL2303_HXN_RESET_DOWN_UPSTREAM to
> PL2303_HXN_RESET_CONTROL
> 3. Re-Sorting flow-control register definition by address.
> 4. Indent continuation lines at least tw tabs.
>
> v5:
> 1. Modify pl2303_update_reg
> 2. add a patch version on subject
> 3. add a space after each colon at subject line
> ---
> drivers/usb/serial/pl2303.c | 127 +++++++++++++++++++++++++++++-------
> drivers/usb/serial/pl2303.h | 7 +-
> 2 files changed, 108 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
> index d7abde14b3cf..d36d53b234c4 100644
> --- a/drivers/usb/serial/pl2303.c
> +++ b/drivers/usb/serial/pl2303.c
> @@ -47,6 +47,12 @@ static const struct usb_device_id id_table[] = {
> { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MOTOROLA) },
> { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ZTEK) },
> { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_TB) },
> + { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GC) },
> + { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GB) },
> + { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GT) },
> + { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GL) },
> + { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GE) },
> + { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GS) },
> { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
> { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
> { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID),
> @@ -130,9 +136,11 @@ MODULE_DEVICE_TABLE(usb, id_table);
>
> #define VENDOR_WRITE_REQUEST_TYPE 0x40
> #define VENDOR_WRITE_REQUEST 0x01
> +#define VENDOR_WRITE_NREQUEST 0x80
>
> #define VENDOR_READ_REQUEST_TYPE 0xc0
> #define VENDOR_READ_REQUEST 0x01
> +#define VENDOR_READ_NREQUEST 0x81
>
> #define UART_STATE_INDEX 8
> #define UART_STATE_MSR_MASK 0x8b
> @@ -147,12 +155,22 @@ MODULE_DEVICE_TABLE(usb, id_table);
> #define UART_CTS 0x80
>
> #define PL2303_FLOWCTRL_MASK 0xf0
> +#define PL2303_HXN_FLOWCTRL_MASK 0x1C
Move after PL2303_HXN_RESET_CONTROL as I suggested.
> +#define PL2303_READ_TYPE_HX_STATUS 0x8080
> +
> +#define PL2303_HXN_RESET_CONTROL 0x07
> +#define PL2303_HXN_FLOWCTRL 0x0A
> +#define PL2303_HXN_CTRL_XON_XOFF 0x0C
> +#define PL2303_HXN_CTRL_RTS_CTS 0x18
> +#define PL2303_HXN_CTRL_NONE 0x1C
> @@ -719,14 +771,34 @@ static void pl2303_set_termios(struct tty_struct *tty,
> }
>
> if (C_CRTSCTS(tty)) {
> - if (spriv->quirks & PL2303_QUIRK_LEGACY)
> - pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK,
> 0x40);
> - else
> - pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK,
> 0x60);
> + if (spriv->quirks & PL2303_QUIRK_LEGACY) {
> + pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK,
> + 0x40);
No need to break this line even if you end up with slightly more than 80
chars.
> + } else if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
> + pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL,
> + PL2303_HXN_FLOWCTRL_MASK,
> + PL2303_HXN_CTRL_RTS_CTS);
Again, continuation lines should be indented at least two tabs further
(you only use one tab now).
> + } else {
> + pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK,
> + 0x60);
No need to break line.
> + }
> } else if (pl2303_enable_xonxoff(tty, spriv->type)) {
> - pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0xc0);
> + if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
> + pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL,
> + PL2303_HXN_FLOWCTRL_MASK,
> + PL2303_HXN_CTRL_XON_XOFF);
Indentation.
> + } else {
> + pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK,
> + 0xc0);
No need to break line.
> + }
> } else {
> - pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0);
> + if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
> + pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL,
> + PL2303_HXN_FLOWCTRL_MASK,
> + PL2303_HXN_CTRL_NONE);
Indentation.
> + } else {
> + pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0);
> + }
> }
>
> kfree(buf);
> @@ -767,8 +839,13 @@ static int pl2303_open(struct tty_struct *tty, struct
> usb_serial_port *port)
> usb_clear_halt(serial->dev, port->read_urb->pipe);
> } else {
> /* reset upstream data pipes */
> - pl2303_vendor_write(serial, 8, 0);
> - pl2303_vendor_write(serial, 9, 0);
> + if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
Merge this with else above to reduce indentation, that is
} else if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
> + pl2303_vendor_write(serial, PL2303_HXN_RESET_CONTROL,
> + 0);
You again completely ignored my question about why you're wring 0
instead of 3 here.
I'll ignore your patch until you explain.
> + } else {
> + pl2303_vendor_write(serial, 8, 0);
> + pl2303_vendor_write(serial, 9, 0);
> + }
> }
Johan
