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USB: serial: cp210x: add GPIO support for CP2104

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The CP2104 chips feature 4 controllable GPIO pins, which are similar to
the ones on CP2102N chip (output-only when push-pull, output or
simulated input mode when open-drain).

Add support for the GPIO pins for cp210x driver. The pin get/set routine
is shared with CP2102N, but the pinconf initialization code is not
shared because the acquisition of GPIO configuration in OTP ROM is
similar to CP2105, not CP2102N.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Icenowy Zheng 2019-01-28 13:57:17 +08:00 committed by Johan Hovold
parent a49e1abf07
commit 15fb84b741
1 changed files with 78 additions and 4 deletions
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82
drivers/usb/serial/cp210x.c
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@ -443,10 +443,10 @@ struct cp210x_pin_mode {
#define CP210X_PIN_MODE_GPIO BIT(0)
/*
* CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes.
* Structure needs padding due to unused/unspecified bytes.
* CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
* on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
*/
struct cp210x_config {
struct cp210x_dual_port_config {
__le16 gpio_mode;
u8 __pad0[2];
__le16 reset_state;
@ -457,6 +457,19 @@ struct cp210x_config {
u8 device_cfg;
} __packed;
/*
* CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
* on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
*/
struct cp210x_single_port_config {
__le16 gpio_mode;
u8 __pad0[2];
__le16 reset_state;
u8 __pad1[4];
__le16 suspend_state;
u8 device_cfg;
} __packed;
/* GPIO modes */
#define CP210X_SCI_GPIO_MODE_OFFSET 9
#define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9)
@ -464,11 +477,19 @@ struct cp210x_config {
#define CP210X_ECI_GPIO_MODE_OFFSET 2
#define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2)
#define CP210X_GPIO_MODE_OFFSET 8
#define CP210X_GPIO_MODE_MASK GENMASK(11, 8)
/* CP2105 port configuration values */
#define CP2105_GPIO0_TXLED_MODE BIT(0)
#define CP2105_GPIO1_RXLED_MODE BIT(1)
#define CP2105_GPIO1_RS485_MODE BIT(2)
/* CP2104 port configuration values */
#define CP2104_GPIO0_TXLED_MODE BIT(0)
#define CP2104_GPIO1_RXLED_MODE BIT(1)
#define CP2104_GPIO2_RS485_MODE BIT(2)
/* CP2102N configuration array indices */
#define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2
#define CP210X_2NCONFIG_GPIO_MODE_IDX 581
@ -1470,7 +1491,7 @@ static int cp2105_gpioconf_init(struct usb_serial *serial)
{
struct cp210x_serial_private *priv = usb_get_serial_data(serial);
struct cp210x_pin_mode mode;
struct cp210x_config config;
struct cp210x_dual_port_config config;
u8 intf_num = cp210x_interface_num(serial);
u8 iface_config;
int result;
@ -1529,6 +1550,56 @@ static int cp2105_gpioconf_init(struct usb_serial *serial)
return 0;
}
static int cp2104_gpioconf_init(struct usb_serial *serial)
{
struct cp210x_serial_private *priv = usb_get_serial_data(serial);
struct cp210x_single_port_config config;
u8 iface_config;
u8 gpio_latch;
int result;
u8 i;
result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
CP210X_GET_PORTCONFIG, &config,
sizeof(config));
if (result < 0)
return result;
priv->gc.ngpio = 4;
iface_config = config.device_cfg;
priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
CP210X_GPIO_MODE_MASK) >>
CP210X_GPIO_MODE_OFFSET);
gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
CP210X_GPIO_MODE_MASK) >>
CP210X_GPIO_MODE_OFFSET);
/* mark all pins which are not in GPIO mode */
if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */
priv->gpio_altfunc |= BIT(0);
if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */
priv->gpio_altfunc |= BIT(1);
if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */
priv->gpio_altfunc |= BIT(2);
/*
* Like CP2102N, CP2104 has also no strict input and output pin
* modes.
* Do the same input mode emulation as CP2102N.
*/
for (i = 0; i < priv->gc.ngpio; ++i) {
/*
* Set direction to "input" iff pin is open-drain and reset
* value is 1.
*/
if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
priv->gpio_input |= BIT(i);
}
return 0;
}
static int cp2102n_gpioconf_init(struct usb_serial *serial)
{
struct cp210x_serial_private *priv = usb_get_serial_data(serial);
@ -1627,6 +1698,9 @@ static int cp210x_gpio_init(struct usb_serial *serial)
int result;
switch (priv->partnum) {
case CP210X_PARTNUM_CP2104:
result = cp2104_gpioconf_init(serial);
break;
case CP210X_PARTNUM_CP2105:
result = cp2105_gpioconf_init(serial);
break;