On Thu, Jun 06, 2019 at 10:54:12AM +0800, Ji-Ze Hong (Peter Hong) wrote:
> Force F81534A series UARTs with RS232 mode in port_probe().
Please expand on why you need this here.
> Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@xxxxxxxxx>
> ---
> drivers/usb/serial/f81232.c | 15 +++++++++++++++
> 1 file changed, 15 insertions(+)
>
> diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
> index 84efcc66aa56..75dfc0b9ef30 100644
> --- a/drivers/usb/serial/f81232.c
> +++ b/drivers/usb/serial/f81232.c
> @@ -83,12 +83,22 @@ MODULE_DEVICE_TABLE(usb, id_table);
> #define F81232_F81232_TYPE 1
> #define F81232_F81534A_TYPE 2
>
> +/* Serial port self GPIO control, 2bytes [control&output data][input data] */
> +#define F81534A_GPIO_REG 0x10e
> +#define F81534A_GPIO_MODE2_DIR BIT(6) /* 1: input, 0: output */
> +#define F81534A_GPIO_MODE1_DIR BIT(5)
> +#define F81534A_GPIO_MODE0_DIR BIT(4)
> +#define F81534A_GPIO_MODE2_OUTPUT BIT(2)
> +#define F81534A_GPIO_MODE1_OUTPUT BIT(1)
> +#define F81534A_GPIO_MODE0_OUTPUT BIT(0)
> +
> struct f81232_private {
> struct mutex lock;
> u8 modem_control;
> u8 modem_status;
> u8 shadow_lcr;
> u8 device_type;
> + u8 gpio_mode;
Why store the mode? Are you going to use it later?
> speed_t baud_base;
> struct work_struct lsr_work;
> struct work_struct interrupt_work;
> @@ -871,6 +881,11 @@ static int f81232_port_probe(struct usb_serial_port *port)
> switch (priv->device_type) {
> case F81232_F81534A_TYPE:
> priv->process_read_urb = f81534a_process_read_urb;
> + priv->gpio_mode = F81534A_GPIO_MODE2_DIR;
> +
> + /* tri-state with pull-high, default RS232 Mode */
> + status = f81232_set_register(port, F81534A_GPIO_REG,
> + priv->gpio_mode);
> break;
>
> case F81232_F81232_TYPE:
Johan
