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USB: serial: f81534: add output pin control 

The F81532/534 had 3 output pin (M0/SD, M1, M2) with open-drain mode to
control transceiver. We'll read it from internal Flash with address
0x2f05~0x2f08 for 4 ports. The value is range from 0 to 7. The M0/SD is
MSB of this value. For a examples, If read value is 6, we'll write M0/SD,
M1, M2 as 1, 1, 0.

Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Ji-Ze Hong (Peter Hong) 2018-01-11 14:47:17 +08:00 committed by Johan Hovold
parent ee0309b46a
commit 138651e118
1 changed files with 66 additions and 1 deletions
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67
drivers/usb/serial/f81534.c
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@ -52,6 +52,7 @@
#define F81534_CUSTOM_NO_CUSTOM_DATA 0xff
#define F81534_CUSTOM_VALID_TOKEN 0xf0
#define F81534_CONF_OFFSET 1
#define F81534_CONF_GPIO_OFFSET 4
#define F81534_MAX_DATA_BLOCK 64
#define F81534_MAX_BUS_RETRY 20
@ -164,6 +165,23 @@ struct f81534_port_private {
u8 phy_num;
};
struct f81534_pin_data {
const u16 reg_addr;
const u8 reg_mask;
};
struct f81534_port_out_pin {
struct f81534_pin_data pin[3];
};
/* Pin output value for M2/M1/M0(SD) */
static const struct f81534_port_out_pin f81534_port_out_pins[] = {
{ { { 0x2ae8, BIT(7) }, { 0x2a90, BIT(5) }, { 0x2a90, BIT(4) } } },
{ { { 0x2ae8, BIT(6) }, { 0x2ae8, BIT(0) }, { 0x2ae8, BIT(3) } } },
{ { { 0x2a90, BIT(0) }, { 0x2ae8, BIT(2) }, { 0x2a80, BIT(6) } } },
{ { { 0x2a90, BIT(3) }, { 0x2a90, BIT(2) }, { 0x2a90, BIT(1) } } },
};
static u32 const baudrate_table[] = { 115200, 921600, 1152000, 1500000 };
static u8 const clock_table[] = { F81534_CLK_1_846_MHZ, F81534_CLK_14_77_MHZ,
F81534_CLK_18_46_MHZ, F81534_CLK_24_MHZ };
@ -273,6 +291,22 @@ static int f81534_get_register(struct usb_serial *serial, u16 reg, u8 *data)
return status;
}
static int f81534_set_mask_register(struct usb_serial *serial, u16 reg,
u8 mask, u8 data)
{
int status;
u8 tmp;
status = f81534_get_register(serial, reg, &tmp);
if (status)
return status;
tmp &= ~mask;
tmp |= (mask & data);
return f81534_set_register(serial, reg, tmp);
}
static int f81534_set_port_register(struct usb_serial_port *port, u16 reg,
u8 data)
{
@ -1281,6 +1315,37 @@ static void f81534_lsr_worker(struct work_struct *work)
dev_warn(&port->dev, "read LSR failed: %d\n", status);
}
static int f81534_set_port_output_pin(struct usb_serial_port *port)
{
struct f81534_serial_private *serial_priv;
struct f81534_port_private *port_priv;
struct usb_serial *serial;
const struct f81534_port_out_pin *pins;
int status;
int i;
u8 value;
u8 idx;
serial = port->serial;
serial_priv = usb_get_serial_data(serial);
port_priv = usb_get_serial_port_data(port);
idx = F81534_CONF_GPIO_OFFSET + port_priv->phy_num;
value = serial_priv->conf_data[idx];
pins = &f81534_port_out_pins[port_priv->phy_num];
for (i = 0; i < ARRAY_SIZE(pins->pin); ++i) {
status = f81534_set_mask_register(serial,
pins->pin[i].reg_addr, pins->pin[i].reg_mask,
value & BIT(i) ? pins->pin[i].reg_mask : 0);
if (status)
return status;
}
dev_dbg(&port->dev, "Output pin (M0/M1/M2): %d\n", value);
return 0;
}
static int f81534_port_probe(struct usb_serial_port *port)
{
struct f81534_serial_private *serial_priv;
@ -1339,7 +1404,7 @@ static int f81534_port_probe(struct usb_serial_port *port)
break;
}
return 0;
return f81534_set_port_output_pin(port);
}
static int f81534_port_remove(struct usb_serial_port *port)