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authorJohan Hovold <johan@kernel.org>2018-09-30 14:27:03 +0200
committerJohan Hovold <johan@kernel.org>2018-10-05 08:57:06 +0200
commitff32d97e39e7053fdc1d316bd2e2eff70b77fdd2 (patch)
tree01ecdc02233d27560d2dc6fc3c87e4f713c258ad /drivers/usb
parente0658e3074231d68f6546be1c5916ba2f4dc1295 (diff)
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USB: serial: ftdi_sio: add support for FT232R CBUS gpios
Enable support for cbus gpios on FT232R. The cbus configuration is stored in one word in the EEPROM at offset 0x0a (byte-offset 0x14) with the mux config for CBUS0, CBUS1, CBUS2 and CBUS3 in bits 0..3, 4..7, 8..11 and 12..15, respectively. Tested using FT232RL by configuring one cbus pin at a time. Signed-off-by: Johan Hovold <johan@kernel.org>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/serial/ftdi_sio.c40
-rw-r--r--drivers/usb/serial/ftdi_sio.h3
2 files changed, 40 insertions, 3 deletions
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index be50b2a200aa..f1eb20acb3bb 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -2007,7 +2007,40 @@ static int ftdi_read_eeprom(struct usb_serial *serial, void *dst, u16 addr,
return 0;
}
-static int ftx_gpioconf_init(struct usb_serial_port *port)
+static int ftdi_gpio_init_ft232r(struct usb_serial_port *port)
+{
+ struct ftdi_private *priv = usb_get_serial_port_data(port);
+ u16 cbus_config;
+ u8 *buf;
+ int ret;
+ int i;
+
+ buf = kmalloc(2, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ ret = ftdi_read_eeprom(port->serial, buf, 0x14, 2);
+ if (ret < 0)
+ goto out_free;
+
+ cbus_config = le16_to_cpup((__le16 *)buf);
+ dev_dbg(&port->dev, "cbus_config = 0x%04x\n", cbus_config);
+
+ priv->gc.ngpio = 4;
+
+ priv->gpio_altfunc = 0xff;
+ for (i = 0; i < priv->gc.ngpio; ++i) {
+ if ((cbus_config & 0xf) == FTDI_FT232R_CBUS_MUX_GPIO)
+ priv->gpio_altfunc &= ~BIT(i);
+ cbus_config >>= 4;
+ }
+out_free:
+ kfree(buf);
+
+ return ret;
+}
+
+static int ftdi_gpio_init_ftx(struct usb_serial_port *port)
{
struct ftdi_private *priv = usb_get_serial_port_data(port);
struct usb_serial *serial = port->serial;
@@ -2049,8 +2082,11 @@ static int ftdi_gpio_init(struct usb_serial_port *port)
int result;
switch (priv->chip_type) {
+ case FT232RL:
+ result = ftdi_gpio_init_ft232r(port);
+ break;
case FTX:
- result = ftx_gpioconf_init(port);
+ result = ftdi_gpio_init_ftx(port);
break;
default:
return 0;
diff --git a/drivers/usb/serial/ftdi_sio.h b/drivers/usb/serial/ftdi_sio.h
index 6cfe682f8348..a79a1325b4d9 100644
--- a/drivers/usb/serial/ftdi_sio.h
+++ b/drivers/usb/serial/ftdi_sio.h
@@ -457,7 +457,8 @@ enum ftdi_sio_baudrate {
#define FTDI_SIO_READ_EEPROM_REQUEST_TYPE 0xc0
#define FTDI_SIO_READ_EEPROM_REQUEST FTDI_SIO_READ_EEPROM
-#define FTDI_FTX_CBUS_MUX_GPIO 8
+#define FTDI_FTX_CBUS_MUX_GPIO 0x8
+#define FTDI_FT232R_CBUS_MUX_GPIO 0xa
/* Descriptors returned by the device